ftrace: Synchronize the initialization of ftrace_opsgrafted

There's some internal state that ftrace_ops needs to have set, but since
it can be declared outside of the ftrace.c code, it calls
ftrace_ops_init() on the ops in every global function. The issue is that
if two tasks call it on the same ops at the same time it is possible to
have the initialization of one corrupt the initialization of the other
call.

Create a ops_mutex to use to synchronize every initialization of the
ftrace_ops. The mutex is taken within checking the ftrace_ops flag that
states it was initializied but the flag is checked again after the mutex
has been taken. Checking first outside the mutex allows it to shortcut
having to take the mutex. But then the check needs to be done again after
the mute is taken in case of races.

Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home
Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock")
Reported-by: sashiko-bot@kernel.org
Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

18 files changed, 9555 insertions, 0 deletions

diff --git a/drivers/iio/temperature/Kconfig b/drivers/iio/temperature/Kconfig
new file mode 100644
index 000000000..9328b2250
--- /dev/null
+++ b/drivers/iio/temperature/Kconfig
@@ -0,0 +1,187 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Temperature sensor drivers
+#
+menu "Temperature sensors"
+
+config IQS620AT_TEMP
+	tristate "Azoteq IQS620AT temperature sensor"
+	depends on MFD_IQS62X || COMPILE_TEST
+	help
+	  Say Y here if you want to build support for the Azoteq IQS620AT
+	  temperature sensor.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called iqs620at-temp.
+
+config LTC2983
+	tristate "Analog Devices Multi-Sensor Digital Temperature Measurement System"
+	depends on SPI
+	select REGMAP_SPI
+	help
+	  Say yes here to build support for the LTC2983 Multi-Sensor
+	  high accuracy digital temperature measurement system.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called ltc2983.
+
+config MAXIM_THERMOCOUPLE
+	tristate "Maxim thermocouple sensors"
+	depends on SPI
+	select IIO_BUFFER
+	select IIO_TRIGGERED_BUFFER
+	help
+	  If you say yes here you get support for the Maxim series of
+	  thermocouple sensors connected via SPI.
+
+	  Supported sensors:
+	   * MAX6675
+	   * MAX31855
+
+	  This driver can also be built as a module. If so, the module will
+	  be called maxim_thermocouple.
+
+config HID_SENSOR_TEMP
+	tristate "HID Environmental temperature sensor"
+	depends on HID_SENSOR_HUB
+	select IIO_BUFFER
+	select HID_SENSOR_IIO_COMMON
+	select HID_SENSOR_IIO_TRIGGER
+	help
+	  Say yes here to build support for the HID SENSOR
+	  temperature driver
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called hid-sensor-temperature.
+
+config MLX90614
+	tristate "MLX90614 contact-less infrared sensor"
+	depends on I2C
+	help
+	  If you say yes here you get support for the Melexis
+	  MLX90614 contact-less infrared sensor connected with I2C.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called mlx90614.
+
+config MLX90632
+	tristate "MLX90632 contact-less infrared sensor with medical accuracy"
+	depends on I2C
+	select REGMAP_I2C
+	help
+	  If you say yes here you get support for the Melexis
+	  MLX90632 contact-less infrared sensor with medical accuracy
+	  connected with I2C.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called mlx90632.
+
+config MLX90635
+	tristate "MLX90635 contact-less infrared sensor with medical accuracy"
+	depends on I2C
+	select REGMAP_I2C
+	help
+	  If you say yes here you get support for the Melexis
+	  MLX90635 contact-less infrared sensor with medical accuracy
+	  connected with I2C.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called mlx90635.
+
+config TMP006
+	tristate "TMP006 infrared thermopile sensor"
+	depends on I2C
+	select IIO_BUFFER
+	select IIO_TRIGGERED_BUFFER
+	help
+	  If you say yes here you get support for the Texas Instruments
+	  TMP006 infrared thermopile sensor.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called tmp006.
+
+config TMP007
+	tristate "TMP007 infrared thermopile sensor with Integrated Math Engine"
+	depends on I2C
+	help
+	  If you say yes here you get support for the Texas Instruments
+	  TMP007 infrared thermopile sensor with Integrated Math Engine.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called tmp007.
+
+config TMP117
+	tristate "TMP117 Digital temperature sensor with integrated NV memory"
+	depends on I2C
+	help
+	  If you say yes here you get support for the Texas Instruments
+	  TMP117 Digital temperature sensor with integrated NV memory.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called tmp117.
+
+config TSYS01
+	tristate "Measurement Specialties TSYS01 temperature sensor using I2C bus connection"
+	depends on I2C
+	select IIO_MS_SENSORS_I2C
+	help
+	  If you say yes here you get support for the Measurement Specialties
+	  TSYS01 I2C temperature sensor.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called tsys01.
+
+config TSYS02D
+	tristate "Measurement Specialties TSYS02D temperature sensor"
+	depends on I2C
+	select IIO_MS_SENSORS_I2C
+	help
+	  If you say yes here you get support for the Measurement Specialties
+	  TSYS02D temperature sensor.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called tsys02d.
+
+config MAX30208
+	tristate "Maxim MAX30208 digital temperature sensor"
+	depends on I2C
+	help
+	  If you say yes here you get support for Maxim MAX30208
+	  digital temperature sensor connected via I2C.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called max30208.
+
+config MAX31856
+	tristate "MAX31856 thermocouple sensor"
+	depends on SPI
+	help
+	  If you say yes here you get support for MAX31856
+	  thermocouple sensor chip connected via SPI.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called max31856.
+
+config MAX31865
+	tristate "MAX31865 RTD to Digital converter"
+	depends on SPI
+	help
+	  If you say yes here you get support for MAX31865
+	  thermocouple sensor chip connected via SPI.
+
+	  This driver can also be build as a module. If so, the module
+	  will be called max31865.
+
+config MCP9600
+	tristate "MCP9600 and similar thermocouple EMF converters"
+	depends on I2C
+	help
+	  If you say yes here you get support for...
+	  - MCP9600
+	  - MCP9601
+	  ...thermocouple EMF converters connected via I2C.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called mcp9600.
+
+endmenu
diff --git a/drivers/iio/temperature/Makefile b/drivers/iio/temperature/Makefile
new file mode 100644
index 000000000..0850bf691
--- /dev/null
+++ b/drivers/iio/temperature/Makefile
@@ -0,0 +1,21 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for industrial I/O temperature drivers
+#
+
+obj-$(CONFIG_IQS620AT_TEMP) += iqs620at-temp.o
+obj-$(CONFIG_LTC2983) += ltc2983.o
+obj-$(CONFIG_HID_SENSOR_TEMP) += hid-sensor-temperature.o
+obj-$(CONFIG_MAXIM_THERMOCOUPLE) += maxim_thermocouple.o
+obj-$(CONFIG_MAX30208) += max30208.o
+obj-$(CONFIG_MAX31856) += max31856.o
+obj-$(CONFIG_MAX31865) += max31865.o
+obj-$(CONFIG_MCP9600) += mcp9600.o
+obj-$(CONFIG_MLX90614) += mlx90614.o
+obj-$(CONFIG_MLX90632) += mlx90632.o
+obj-$(CONFIG_MLX90635) += mlx90635.o
+obj-$(CONFIG_TMP006) += tmp006.o
+obj-$(CONFIG_TMP007) += tmp007.o
+obj-$(CONFIG_TMP117) += tmp117.o
+obj-$(CONFIG_TSYS01) += tsys01.o
+obj-$(CONFIG_TSYS02D) += tsys02d.o
diff --git a/drivers/iio/temperature/hid-sensor-temperature.c b/drivers/iio/temperature/hid-sensor-temperature.c
new file mode 100644
index 000000000..5e3262e46
--- /dev/null
+++ b/drivers/iio/temperature/hid-sensor-temperature.c
@@ -0,0 +1,294 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * HID Sensors Driver
+ * Copyright (c) 2017, Intel Corporation.
+ */
+#include <linux/device.h>
+#include <linux/hid-sensor-hub.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/iio.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include "../common/hid-sensors/hid-sensor-trigger.h"
+
+struct temperature_state {
+	struct hid_sensor_common common_attributes;
+	struct hid_sensor_hub_attribute_info temperature_attr;
+	struct {
+		s32 temperature_data;
+		aligned_s64 timestamp;
+	} scan;
+	int scale_pre_decml;
+	int scale_post_decml;
+	int scale_precision;
+	int value_offset;
+};
+
+static const u32 temperature_sensitivity_addresses[] = {
+	HID_USAGE_SENSOR_DATA_ENVIRONMENTAL_TEMPERATURE,
+};
+
+/* Channel definitions */
+static const struct iio_chan_spec temperature_channels[] = {
+	{
+		.type = IIO_TEMP,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
+			BIT(IIO_CHAN_INFO_SCALE) |
+			BIT(IIO_CHAN_INFO_SAMP_FREQ) |
+			BIT(IIO_CHAN_INFO_HYSTERESIS),
+	},
+	IIO_CHAN_SOFT_TIMESTAMP(1),
+};
+
+/* Adjust channel real bits based on report descriptor */
+static void temperature_adjust_channel_bit_mask(struct iio_chan_spec *channels,
+						int channel, int size)
+{
+	channels[channel].scan_type.sign = 's';
+	/* Real storage bits will change based on the report desc. */
+	channels[channel].scan_type.realbits = size * 8;
+	/* Maximum size of a sample to capture is s32 */
+	channels[channel].scan_type.storagebits = sizeof(s32) * 8;
+}
+
+static int temperature_read_raw(struct iio_dev *indio_dev,
+				struct iio_chan_spec const *chan,
+				int *val, int *val2, long mask)
+{
+	struct temperature_state *temp_st = iio_priv(indio_dev);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		if (chan->type != IIO_TEMP)
+			return -EINVAL;
+		hid_sensor_power_state(
+			&temp_st->common_attributes, true);
+		*val = sensor_hub_input_attr_get_raw_value(
+			temp_st->common_attributes.hsdev,
+			HID_USAGE_SENSOR_TEMPERATURE,
+			HID_USAGE_SENSOR_DATA_ENVIRONMENTAL_TEMPERATURE,
+			temp_st->temperature_attr.report_id,
+			SENSOR_HUB_SYNC,
+			temp_st->temperature_attr.logical_minimum < 0);
+		hid_sensor_power_state(
+				&temp_st->common_attributes,
+				false);
+
+		return IIO_VAL_INT;
+
+	case IIO_CHAN_INFO_SCALE:
+		*val = temp_st->scale_pre_decml;
+		*val2 = temp_st->scale_post_decml;
+		return temp_st->scale_precision;
+
+	case IIO_CHAN_INFO_OFFSET:
+		*val = temp_st->value_offset;
+		return IIO_VAL_INT;
+
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		return hid_sensor_read_samp_freq_value(
+				&temp_st->common_attributes, val, val2);
+
+	case IIO_CHAN_INFO_HYSTERESIS:
+		return hid_sensor_read_raw_hyst_value(
+				&temp_st->common_attributes, val, val2);
+	default:
+		return -EINVAL;
+	}
+}
+
+static int temperature_write_raw(struct iio_dev *indio_dev,
+				 struct iio_chan_spec const *chan,
+				 int val, int val2, long mask)
+{
+	struct temperature_state *temp_st = iio_priv(indio_dev);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		return hid_sensor_write_samp_freq_value(
+				&temp_st->common_attributes, val, val2);
+	case IIO_CHAN_INFO_HYSTERESIS:
+		return hid_sensor_write_raw_hyst_value(
+				&temp_st->common_attributes, val, val2);
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct iio_info temperature_info = {
+	.read_raw = &temperature_read_raw,
+	.write_raw = &temperature_write_raw,
+};
+
+/* Callback handler to send event after all samples are received and captured */
+static int temperature_proc_event(struct hid_sensor_hub_device *hsdev,
+				  u32 usage_id, void *pdev)
+{
+	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+	struct temperature_state *temp_st = iio_priv(indio_dev);
+
+	if (atomic_read(&temp_st->common_attributes.data_ready))
+		iio_push_to_buffers_with_ts(indio_dev, &temp_st->scan,
+					    sizeof(temp_st->scan),
+					    iio_get_time_ns(indio_dev));
+
+	return 0;
+}
+
+/* Capture samples in local storage */
+static int temperature_capture_sample(struct hid_sensor_hub_device *hsdev,
+				      u32 usage_id,
+				      size_t raw_len, char *raw_data,
+				      void *pdev)
+{
+	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+	struct temperature_state *temp_st = iio_priv(indio_dev);
+
+	switch (usage_id) {
+	case HID_USAGE_SENSOR_DATA_ENVIRONMENTAL_TEMPERATURE:
+		temp_st->scan.temperature_data = *(s32 *)raw_data;
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
+/* Parse report which is specific to an usage id*/
+static int temperature_parse_report(struct platform_device *pdev,
+				    struct hid_sensor_hub_device *hsdev,
+				    struct iio_chan_spec *channels,
+				    u32 usage_id,
+				    struct temperature_state *st)
+{
+	int ret;
+
+	ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
+			usage_id,
+			HID_USAGE_SENSOR_DATA_ENVIRONMENTAL_TEMPERATURE,
+			&st->temperature_attr);
+	if (ret < 0)
+		return ret;
+
+	temperature_adjust_channel_bit_mask(channels, 0, st->temperature_attr.size);
+
+	st->scale_precision = hid_sensor_format_scale(
+				HID_USAGE_SENSOR_TEMPERATURE,
+				&st->temperature_attr,
+				&st->scale_pre_decml, &st->scale_post_decml);
+
+	return ret;
+}
+
+static struct hid_sensor_hub_callbacks temperature_callbacks = {
+	.send_event = &temperature_proc_event,
+	.capture_sample = &temperature_capture_sample,
+};
+
+/* Function to initialize the processing for usage id */
+static int hid_temperature_probe(struct platform_device *pdev)
+{
+	static const char *name = "temperature";
+	struct iio_dev *indio_dev;
+	struct temperature_state *temp_st;
+	struct iio_chan_spec *temp_chans;
+	struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*temp_st));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	temp_st = iio_priv(indio_dev);
+	temp_st->common_attributes.hsdev = hsdev;
+	temp_st->common_attributes.pdev = pdev;
+
+	ret = hid_sensor_parse_common_attributes(hsdev,
+					HID_USAGE_SENSOR_TEMPERATURE,
+					&temp_st->common_attributes,
+					temperature_sensitivity_addresses,
+					ARRAY_SIZE(temperature_sensitivity_addresses));
+	if (ret)
+		return ret;
+
+	temp_chans = devm_kmemdup(&pdev->dev, temperature_channels,
+				  sizeof(temperature_channels), GFP_KERNEL);
+	if (!temp_chans)
+		return -ENOMEM;
+
+	ret = temperature_parse_report(pdev, hsdev, temp_chans,
+				       HID_USAGE_SENSOR_TEMPERATURE, temp_st);
+	if (ret)
+		return ret;
+
+	indio_dev->channels = temp_chans;
+	indio_dev->num_channels = ARRAY_SIZE(temperature_channels);
+	indio_dev->info = &temperature_info;
+	indio_dev->name = name;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+
+	atomic_set(&temp_st->common_attributes.data_ready, 0);
+
+	ret = hid_sensor_setup_trigger(indio_dev, name,
+				       &temp_st->common_attributes);
+	if (ret)
+		return ret;
+
+	platform_set_drvdata(pdev, indio_dev);
+
+	temperature_callbacks.pdev = pdev;
+	ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_TEMPERATURE,
+					   &temperature_callbacks);
+	if (ret)
+		goto error_remove_trigger;
+
+	ret = iio_device_register(indio_dev);
+	if (ret)
+		goto error_remove_callback;
+
+	return ret;
+
+error_remove_callback:
+	sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_TEMPERATURE);
+error_remove_trigger:
+	hid_sensor_remove_trigger(indio_dev, &temp_st->common_attributes);
+	return ret;
+}
+
+/* Function to deinitialize the processing for usage id */
+static void hid_temperature_remove(struct platform_device *pdev)
+{
+	struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);
+	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+	struct temperature_state *temp_st = iio_priv(indio_dev);
+
+	iio_device_unregister(indio_dev);
+	sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_TEMPERATURE);
+	hid_sensor_remove_trigger(indio_dev, &temp_st->common_attributes);
+}
+
+static const struct platform_device_id hid_temperature_ids[] = {
+	{
+		/* Format: HID-SENSOR-usage_id_in_hex_lowercase */
+		.name = "HID-SENSOR-200033",
+	},
+	{ }
+};
+MODULE_DEVICE_TABLE(platform, hid_temperature_ids);
+
+static struct platform_driver hid_temperature_platform_driver = {
+	.id_table = hid_temperature_ids,
+	.driver = {
+		.name	= "temperature-sensor",
+		.pm	= &hid_sensor_pm_ops,
+	},
+	.probe		= hid_temperature_probe,
+	.remove		= hid_temperature_remove,
+};
+module_platform_driver(hid_temperature_platform_driver);
+
+MODULE_DESCRIPTION("HID Environmental temperature sensor");
+MODULE_AUTHOR("Song Hongyan <hongyan.song@intel.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_IMPORT_NS("IIO_HID");
diff --git a/drivers/iio/temperature/iqs620at-temp.c b/drivers/iio/temperature/iqs620at-temp.c
new file mode 100644
index 000000000..e2f878d57
--- /dev/null
+++ b/drivers/iio/temperature/iqs620at-temp.c
@@ -0,0 +1,98 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Azoteq IQS620AT Temperature Sensor
+ *
+ * Copyright (C) 2019 Jeff LaBundy <jeff@labundy.com>
+ */
+
+#include <linux/device.h>
+#include <linux/iio/iio.h>
+#include <linux/kernel.h>
+#include <linux/mfd/iqs62x.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#define IQS620_TEMP_UI_OUT			0x1A
+
+#define IQS620_TEMP_SCALE			1000
+#define IQS620_TEMP_OFFSET			(-100)
+#define IQS620_TEMP_OFFSET_V3			(-40)
+
+static int iqs620_temp_read_raw(struct iio_dev *indio_dev,
+				struct iio_chan_spec const *chan,
+				int *val, int *val2, long mask)
+{
+	struct iqs62x_core *iqs62x = iio_device_get_drvdata(indio_dev);
+	int ret;
+	__le16 val_buf;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		ret = regmap_raw_read(iqs62x->regmap, IQS620_TEMP_UI_OUT,
+				      &val_buf, sizeof(val_buf));
+		if (ret)
+			return ret;
+
+		*val = le16_to_cpu(val_buf);
+		return IIO_VAL_INT;
+
+	case IIO_CHAN_INFO_SCALE:
+		*val = IQS620_TEMP_SCALE;
+		return IIO_VAL_INT;
+
+	case IIO_CHAN_INFO_OFFSET:
+		*val = iqs62x->hw_num < IQS620_HW_NUM_V3 ? IQS620_TEMP_OFFSET
+							 : IQS620_TEMP_OFFSET_V3;
+		return IIO_VAL_INT;
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct iio_info iqs620_temp_info = {
+	.read_raw = &iqs620_temp_read_raw,
+};
+
+static const struct iio_chan_spec iqs620_temp_channels[] = {
+	{
+		.type = IIO_TEMP,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE) |
+				      BIT(IIO_CHAN_INFO_OFFSET),
+	},
+};
+
+static int iqs620_temp_probe(struct platform_device *pdev)
+{
+	struct iqs62x_core *iqs62x = dev_get_drvdata(pdev->dev.parent);
+	struct iio_dev *indio_dev;
+
+	indio_dev = devm_iio_device_alloc(&pdev->dev, 0);
+	if (!indio_dev)
+		return -ENOMEM;
+
+	iio_device_set_drvdata(indio_dev, iqs62x);
+
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = iqs620_temp_channels;
+	indio_dev->num_channels = ARRAY_SIZE(iqs620_temp_channels);
+	indio_dev->name = iqs62x->dev_desc->dev_name;
+	indio_dev->info = &iqs620_temp_info;
+
+	return devm_iio_device_register(&pdev->dev, indio_dev);
+}
+
+static struct platform_driver iqs620_temp_platform_driver = {
+	.driver = {
+		.name = "iqs620at-temp",
+	},
+	.probe = iqs620_temp_probe,
+};
+module_platform_driver(iqs620_temp_platform_driver);
+
+MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
+MODULE_DESCRIPTION("Azoteq IQS620AT Temperature Sensor");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:iqs620at-temp");
diff --git a/drivers/iio/temperature/ltc2983.c b/drivers/iio/temperature/ltc2983.c
new file mode 100644
index 000000000..6efb5252a
--- /dev/null
+++ b/drivers/iio/temperature/ltc2983.c
@@ -0,0 +1,2106 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Analog Devices LTC2983 Multi-Sensor Digital Temperature Measurement System
+ * driver
+ *
+ * Copyright 2019 Analog Devices Inc.
+ */
+#include <linux/bitfield.h>
+#include <linux/completion.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/iio/iio.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spi/spi.h>
+
+#include <asm/byteorder.h>
+#include <linux/unaligned.h>
+
+/* register map */
+#define LTC2983_STATUS_REG			0x0000
+#define LTC2983_TEMP_RES_START_REG		0x0010
+#define LTC2983_TEMP_RES_END_REG		0x005F
+#define ADT7604_RES_RES_START_REG		0x0060
+#define ADT7604_RES_RES_END_REG			0x00AF
+#define LTC2983_EEPROM_KEY_REG			0x00B0
+#define LTC2983_EEPROM_READ_STATUS_REG		0x00D0
+#define LTC2983_GLOBAL_CONFIG_REG		0x00F0
+#define LTC2983_MULT_CHANNEL_START_REG		0x00F4
+#define LTC2983_MULT_CHANNEL_END_REG		0x00F7
+#define LTC2986_EEPROM_STATUS_REG		0x00F9
+#define LTC2983_MUX_CONFIG_REG			0x00FF
+#define LTC2983_CHAN_ASSIGN_START_REG		0x0200
+#define LTC2983_CHAN_ASSIGN_END_REG		0x024F
+#define LTC2983_CUST_SENS_TBL_START_REG		0x0250
+#define LTC2983_CUST_SENS_TBL_END_REG		0x03CF
+
+#define LTC2983_DIFFERENTIAL_CHAN_MIN		2
+#define LTC2983_MIN_CHANNELS_NR			1
+#define LTC2983_SLEEP				0x97
+#define LTC2983_CUSTOM_STEINHART_SIZE		24
+#define LTC2983_CUSTOM_SENSOR_ENTRY_SZ		6
+#define LTC2983_CUSTOM_STEINHART_ENTRY_SZ	4
+
+#define LTC2983_EEPROM_KEY			0xA53C0F5A
+#define LTC2983_EEPROM_WRITE_CMD		0x15
+#define LTC2983_EEPROM_READ_CMD			0x16
+#define LTC2983_EEPROM_STATUS_FAILURE_MASK	GENMASK(3, 1)
+#define LTC2983_EEPROM_READ_FAILURE_MASK	GENMASK(7, 0)
+
+#define LTC2983_EEPROM_WRITE_TIME_MS		2600
+#define LTC2983_EEPROM_READ_TIME_MS		20
+
+#define LTC2983_CHAN_ASSIGN_ADDR(chan) \
+			((((chan) - 1) * 4) + LTC2983_CHAN_ASSIGN_START_REG)
+#define LTC2983_RESULT_ADDR(chan, base) \
+			((((chan) - 1) * 4) + (base))
+#define LTC2983_THERMOCOUPLE_DIFF_MASK		BIT(3)
+#define LTC2983_THERMOCOUPLE_SGL(x) \
+				FIELD_PREP(LTC2983_THERMOCOUPLE_DIFF_MASK, x)
+#define LTC2983_THERMOCOUPLE_OC_CURR_MASK	GENMASK(1, 0)
+#define LTC2983_THERMOCOUPLE_OC_CURR(x) \
+				FIELD_PREP(LTC2983_THERMOCOUPLE_OC_CURR_MASK, x)
+#define LTC2983_THERMOCOUPLE_OC_CHECK_MASK	BIT(2)
+#define LTC2983_THERMOCOUPLE_OC_CHECK(x) \
+			FIELD_PREP(LTC2983_THERMOCOUPLE_OC_CHECK_MASK, x)
+
+#define LTC2983_THERMISTOR_DIFF_MASK		BIT(2)
+#define LTC2983_THERMISTOR_SGL(x) \
+				FIELD_PREP(LTC2983_THERMISTOR_DIFF_MASK, x)
+#define LTC2983_THERMISTOR_R_SHARE_MASK		BIT(1)
+#define LTC2983_THERMISTOR_R_SHARE(x) \
+				FIELD_PREP(LTC2983_THERMISTOR_R_SHARE_MASK, x)
+#define LTC2983_THERMISTOR_C_ROTATE_MASK	BIT(0)
+#define LTC2983_THERMISTOR_C_ROTATE(x) \
+				FIELD_PREP(LTC2983_THERMISTOR_C_ROTATE_MASK, x)
+
+#define LTC2983_DIODE_DIFF_MASK			BIT(2)
+#define LTC2983_DIODE_SGL(x) \
+			FIELD_PREP(LTC2983_DIODE_DIFF_MASK, x)
+#define LTC2983_DIODE_3_CONV_CYCLE_MASK		BIT(1)
+#define LTC2983_DIODE_3_CONV_CYCLE(x) \
+				FIELD_PREP(LTC2983_DIODE_3_CONV_CYCLE_MASK, x)
+#define LTC2983_DIODE_AVERAGE_ON_MASK		BIT(0)
+#define LTC2983_DIODE_AVERAGE_ON(x) \
+				FIELD_PREP(LTC2983_DIODE_AVERAGE_ON_MASK, x)
+
+#define LTC2983_RTD_4_WIRE_MASK			BIT(3)
+#define LTC2983_RTD_ROTATION_MASK		BIT(1)
+#define LTC2983_RTD_C_ROTATE(x) \
+			FIELD_PREP(LTC2983_RTD_ROTATION_MASK, x)
+#define LTC2983_RTD_KELVIN_R_SENSE_MASK		GENMASK(3, 2)
+#define LTC2983_RTD_N_WIRES_MASK		GENMASK(3, 2)
+#define LTC2983_RTD_N_WIRES(x) \
+			FIELD_PREP(LTC2983_RTD_N_WIRES_MASK, x)
+#define LTC2983_RTD_R_SHARE_MASK		BIT(0)
+#define LTC2983_RTD_R_SHARE(x) \
+			FIELD_PREP(LTC2983_RTD_R_SHARE_MASK, 1)
+
+#define LTC2983_COMMON_HARD_FAULT_MASK	GENMASK(31, 30)
+#define LTC2983_COMMON_SOFT_FAULT_MASK	GENMASK(27, 25)
+
+#define	LTC2983_STATUS_START_MASK	BIT(7)
+#define	LTC2983_STATUS_START(x)		FIELD_PREP(LTC2983_STATUS_START_MASK, x)
+#define	LTC2983_STATUS_UP_MASK		GENMASK(7, 6)
+#define	LTC2983_STATUS_UP(reg)		FIELD_GET(LTC2983_STATUS_UP_MASK, reg)
+
+#define	LTC2983_STATUS_CHAN_SEL_MASK	GENMASK(4, 0)
+#define	LTC2983_STATUS_CHAN_SEL(x) \
+				FIELD_PREP(LTC2983_STATUS_CHAN_SEL_MASK, x)
+
+#define LTC2983_TEMP_UNITS_MASK		BIT(2)
+#define LTC2983_TEMP_UNITS(x)		FIELD_PREP(LTC2983_TEMP_UNITS_MASK, x)
+
+#define LTC2983_NOTCH_FREQ_MASK		GENMASK(1, 0)
+#define LTC2983_NOTCH_FREQ(x)		FIELD_PREP(LTC2983_NOTCH_FREQ_MASK, x)
+
+#define LTC2983_RES_VALID_MASK		BIT(24)
+#define LTC2983_DATA_MASK		GENMASK(23, 0)
+#define LTC2983_DATA_SIGN_BIT		23
+
+#define LTC2983_CHAN_TYPE_MASK		GENMASK(31, 27)
+#define LTC2983_CHAN_TYPE(x)		FIELD_PREP(LTC2983_CHAN_TYPE_MASK, x)
+
+/* cold junction for thermocouples and rsense for rtd's and thermistor's */
+#define LTC2983_CHAN_ASSIGN_MASK	GENMASK(26, 22)
+#define LTC2983_CHAN_ASSIGN(x)		FIELD_PREP(LTC2983_CHAN_ASSIGN_MASK, x)
+
+#define LTC2983_CUSTOM_LEN_MASK		GENMASK(5, 0)
+#define LTC2983_CUSTOM_LEN(x)		FIELD_PREP(LTC2983_CUSTOM_LEN_MASK, x)
+
+#define LTC2983_CUSTOM_ADDR_MASK	GENMASK(11, 6)
+#define LTC2983_CUSTOM_ADDR(x)		FIELD_PREP(LTC2983_CUSTOM_ADDR_MASK, x)
+
+#define LTC2983_THERMOCOUPLE_CFG_MASK	GENMASK(21, 18)
+#define LTC2983_THERMOCOUPLE_CFG(x) \
+				FIELD_PREP(LTC2983_THERMOCOUPLE_CFG_MASK, x)
+#define LTC2983_THERMOCOUPLE_HARD_FAULT_MASK	GENMASK(31, 29)
+#define LTC2983_THERMOCOUPLE_SOFT_FAULT_MASK	GENMASK(28, 25)
+
+#define LTC2983_RTD_CFG_MASK		GENMASK(21, 18)
+#define LTC2983_RTD_CFG(x)		FIELD_PREP(LTC2983_RTD_CFG_MASK, x)
+#define LTC2983_RTD_EXC_CURRENT_MASK	GENMASK(17, 14)
+#define LTC2983_RTD_EXC_CURRENT(x) \
+				FIELD_PREP(LTC2983_RTD_EXC_CURRENT_MASK, x)
+#define LTC2983_RTD_CURVE_MASK		GENMASK(13, 12)
+#define LTC2983_RTD_CURVE(x)		FIELD_PREP(LTC2983_RTD_CURVE_MASK, x)
+
+#define LTC2983_THERMISTOR_CFG_MASK	GENMASK(21, 19)
+#define LTC2983_THERMISTOR_CFG(x) \
+				FIELD_PREP(LTC2983_THERMISTOR_CFG_MASK, x)
+#define LTC2983_THERMISTOR_EXC_CURRENT_MASK	GENMASK(18, 15)
+#define LTC2983_THERMISTOR_EXC_CURRENT(x) \
+			FIELD_PREP(LTC2983_THERMISTOR_EXC_CURRENT_MASK, x)
+
+#define LTC2983_DIODE_CFG_MASK		GENMASK(26, 24)
+#define LTC2983_DIODE_CFG(x)		FIELD_PREP(LTC2983_DIODE_CFG_MASK, x)
+#define LTC2983_DIODE_EXC_CURRENT_MASK	GENMASK(23, 22)
+#define LTC2983_DIODE_EXC_CURRENT(x) \
+				FIELD_PREP(LTC2983_DIODE_EXC_CURRENT_MASK, x)
+#define LTC2983_DIODE_IDEAL_FACTOR_MASK	GENMASK(21, 0)
+#define LTC2983_DIODE_IDEAL_FACTOR(x) \
+				FIELD_PREP(LTC2983_DIODE_IDEAL_FACTOR_MASK, x)
+
+#define LTC2983_R_SENSE_VAL_MASK	GENMASK(26, 0)
+#define LTC2983_R_SENSE_VAL(x)		FIELD_PREP(LTC2983_R_SENSE_VAL_MASK, x)
+
+#define LTC2983_ADC_SINGLE_ENDED_MASK	BIT(26)
+#define LTC2983_ADC_SINGLE_ENDED(x) \
+				FIELD_PREP(LTC2983_ADC_SINGLE_ENDED_MASK, x)
+
+enum {
+	LTC2983_SENSOR_THERMOCOUPLE = 1,
+	LTC2983_SENSOR_THERMOCOUPLE_CUSTOM = 9,
+	LTC2983_SENSOR_RTD = 10,
+	LTC2983_SENSOR_RTD_CUSTOM = 18,
+	LTC2983_SENSOR_THERMISTOR = 19,
+	LTC2983_SENSOR_THERMISTOR_STEINHART = 26,
+	LTC2983_SENSOR_THERMISTOR_CUSTOM = 27,
+	LTC2983_SENSOR_DIODE = 28,
+	LTC2983_SENSOR_SENSE_RESISTOR = 29,
+	LTC2983_SENSOR_DIRECT_ADC = 30,
+	LTC2983_SENSOR_ACTIVE_TEMP = 31,
+	/* Sensor types for some parts only; map to RTD_CUSTOM/THERMISTOR_CUSTOM in HW */
+	LTC2983_SENSOR_COPPER_TRACE = 32,
+	LTC2983_SENSOR_LEAK_DETECTOR = 33,
+	LTC2983_SENSOR_NUM
+};
+
+/* Bitmask of sensor types supported by LTC2983/LTC2984 and derivatives */
+#define LTC2983_COMMON_SENSORS \
+	(GENMASK_ULL(LTC2983_SENSOR_THERMOCOUPLE_CUSTOM, LTC2983_SENSOR_THERMOCOUPLE) | \
+	 GENMASK_ULL(LTC2983_SENSOR_RTD_CUSTOM, LTC2983_SENSOR_RTD) | \
+	 GENMASK_ULL(LTC2983_SENSOR_THERMISTOR_CUSTOM, LTC2983_SENSOR_THERMISTOR) | \
+	 BIT_ULL(LTC2983_SENSOR_DIODE) | \
+	 BIT_ULL(LTC2983_SENSOR_SENSE_RESISTOR) | \
+	 BIT_ULL(LTC2983_SENSOR_DIRECT_ADC))
+
+/* Bitmask of sensor types supported by ADT7604 */
+#define ADT7604_SENSORS \
+	(GENMASK_ULL(LTC2983_SENSOR_RTD_CUSTOM - 1, LTC2983_SENSOR_RTD) | \
+	 GENMASK_ULL(LTC2983_SENSOR_THERMISTOR_CUSTOM - 1, LTC2983_SENSOR_THERMISTOR) | \
+	 BIT_ULL(LTC2983_SENSOR_SENSE_RESISTOR) | \
+	 BIT_ULL(LTC2983_SENSOR_COPPER_TRACE) | \
+	 BIT_ULL(LTC2983_SENSOR_LEAK_DETECTOR))
+
+#define to_thermocouple(_sensor) \
+		container_of(_sensor, struct ltc2983_thermocouple, sensor)
+
+#define to_rtd(_sensor) \
+		container_of(_sensor, struct ltc2983_rtd, sensor)
+
+#define to_copper_trace(_sensor) \
+		container_of(_sensor, struct ltc2983_copper_trace, sensor)
+
+#define to_thermistor(_sensor) \
+		container_of(_sensor, struct ltc2983_thermistor, sensor)
+
+#define to_leak_detector(_sensor) \
+		container_of(_sensor, struct ltc2983_leak_detector, sensor)
+
+#define to_diode(_sensor) \
+		container_of(_sensor, struct ltc2983_diode, sensor)
+
+#define to_rsense(_sensor) \
+		container_of(_sensor, struct ltc2983_rsense, sensor)
+
+#define to_adc(_sensor) \
+		container_of(_sensor, struct ltc2983_adc, sensor)
+
+#define to_temp(_sensor) \
+		container_of(_sensor, struct ltc2983_temp, sensor)
+
+struct ltc2983_chip_info {
+	const char *name;
+	unsigned int max_channels_nr;
+	u64 supported_sensors;
+	bool has_eeprom;
+};
+
+struct ltc2983_data {
+	const struct ltc2983_chip_info *info;
+	struct regmap *regmap;
+	struct spi_device *spi;
+	struct mutex lock;
+	struct completion completion;
+	struct iio_chan_spec *iio_chan;
+	struct ltc2983_sensor **sensors;
+	u32 mux_delay_config;
+	u32 filter_notch_freq;
+	u16 custom_table_size;
+	u8 num_channels;
+	u8 iio_channels;
+	/*
+	 * DMA (thus cache coherency maintenance) may require the
+	 * transfer buffers to live in their own cache lines.
+	 * Holds the converted temperature
+	 */
+	__be32 temp __aligned(IIO_DMA_MINALIGN);
+	__be32 chan_val;
+	__be32 eeprom_key;
+};
+
+struct ltc2983_sensor {
+	int (*fault_handler)(const struct ltc2983_data *st, const u32 result);
+	int (*assign_chan)(struct ltc2983_data *st,
+			   const struct ltc2983_sensor *sensor);
+	/* specifies the sensor channel */
+	u32 chan;
+	/* sensor type */
+	u32 type;
+	/* number of IIO channels this sensor produces */
+	u8 n_iio_chan;
+};
+
+struct ltc2983_custom_sensor {
+	/* raw table sensor data */
+	void *table;
+	size_t size;
+	/* address offset */
+	s8 offset;
+	bool is_steinhart;
+};
+
+struct ltc2983_thermocouple {
+	struct ltc2983_sensor sensor;
+	struct ltc2983_custom_sensor *custom;
+	u32 sensor_config;
+	u32 cold_junction_chan;
+};
+
+struct ltc2983_rtd {
+	struct ltc2983_sensor sensor;
+	struct ltc2983_custom_sensor *custom;
+	u32 sensor_config;
+	u32 r_sense_chan;
+	u32 excitation_current;
+	u32 rtd_curve;
+};
+
+struct ltc2983_copper_trace {
+	struct ltc2983_sensor sensor;
+	struct ltc2983_custom_sensor *custom;
+	u32 r_sense_chan;
+	u32 excitation_current;
+	/* selects the <1Ω variant: bits 17:0 of the channel word are zeroed,
+	 * disabling excitation current and custom table fields (ADT7604
+	 * datasheet Table 26)
+	 */
+	bool is_sub_ohm;
+};
+
+struct ltc2983_leak_detector {
+	struct ltc2983_sensor sensor;
+	struct ltc2983_custom_sensor *custom;
+	u32 r_sense_chan;
+	u32 excitation_current;
+};
+
+struct ltc2983_thermistor {
+	struct ltc2983_sensor sensor;
+	struct ltc2983_custom_sensor *custom;
+	u32 sensor_config;
+	u32 r_sense_chan;
+	u32 excitation_current;
+};
+
+struct ltc2983_diode {
+	struct ltc2983_sensor sensor;
+	u32 sensor_config;
+	u32 excitation_current;
+	u32 ideal_factor_value;
+};
+
+struct ltc2983_rsense {
+	struct ltc2983_sensor sensor;
+	u32 r_sense_val;
+};
+
+struct ltc2983_adc {
+	struct ltc2983_sensor sensor;
+	bool single_ended;
+};
+
+struct ltc2983_temp {
+	struct ltc2983_sensor sensor;
+	struct ltc2983_custom_sensor *custom;
+	bool single_ended;
+};
+
+/*
+ * Convert to Q format numbers. These number's are integers where
+ * the number of integer and fractional bits are specified. The resolution
+ * is given by 1/@resolution and tell us the number of fractional bits. For
+ * instance a resolution of 2^-10 means we have 10 fractional bits.
+ */
+static u32 __convert_to_raw(const u64 val, const u32 resolution)
+{
+	u64 __res = val * resolution;
+
+	/* all values are multiplied by 1000000 to remove the fraction */
+	do_div(__res, 1000000);
+
+	return __res;
+}
+
+static u32 __convert_to_raw_sign(const u64 val, const u32 resolution)
+{
+	s64 __res = -(s32)val;
+
+	__res = __convert_to_raw(__res, resolution);
+
+	return (u32)-__res;
+}
+
+static int __ltc2983_fault_handler(const struct ltc2983_data *st,
+				   const u32 result, const u32 hard_mask,
+				   const u32 soft_mask)
+{
+	const struct device *dev = &st->spi->dev;
+
+	if (result & hard_mask) {
+		dev_err(dev, "Invalid conversion: Sensor HARD fault\n");
+		return -EIO;
+	} else if (result & soft_mask) {
+		/* just print a warning */
+		dev_warn(dev, "Suspicious conversion: Sensor SOFT fault\n");
+	}
+
+	return 0;
+}
+
+static int __ltc2983_chan_assign_common(struct ltc2983_data *st,
+					const struct ltc2983_sensor *sensor,
+					u32 chan_val)
+{
+	struct device *dev = &st->spi->dev;
+	u32 reg = LTC2983_CHAN_ASSIGN_ADDR(sensor->chan);
+	u32 hw_type = sensor->type;
+
+	if (hw_type == LTC2983_SENSOR_COPPER_TRACE)
+		hw_type = LTC2983_SENSOR_RTD_CUSTOM;
+	else if (hw_type == LTC2983_SENSOR_LEAK_DETECTOR)
+		hw_type = LTC2983_SENSOR_THERMISTOR_CUSTOM;
+
+	chan_val |= LTC2983_CHAN_TYPE(hw_type);
+	dev_dbg(dev, "Assign reg:0x%04X, val:0x%08X\n", reg, chan_val);
+	st->chan_val = cpu_to_be32(chan_val);
+	return regmap_bulk_write(st->regmap, reg, &st->chan_val,
+				 sizeof(st->chan_val));
+}
+
+static int __ltc2983_chan_custom_sensor_assign(struct ltc2983_data *st,
+					  struct ltc2983_custom_sensor *custom,
+					  u32 *chan_val)
+{
+	u32 reg;
+	u8 mult = custom->is_steinhart ? LTC2983_CUSTOM_STEINHART_ENTRY_SZ :
+		LTC2983_CUSTOM_SENSOR_ENTRY_SZ;
+	const struct device *dev = &st->spi->dev;
+	/*
+	 * custom->size holds the raw size of the table. However, when
+	 * configuring the sensor channel, we must write the number of
+	 * entries of the table minus 1. For steinhart sensors 0 is written
+	 * since the size is constant!
+	 */
+	const u8 len = custom->is_steinhart ? 0 :
+		(custom->size / LTC2983_CUSTOM_SENSOR_ENTRY_SZ) - 1;
+	/*
+	 * Check if the offset was assigned already. It should be for steinhart
+	 * sensors. When coming from sleep, it should be assigned for all.
+	 */
+	if (custom->offset < 0) {
+		/*
+		 * This needs to be done again here because, from the moment
+		 * when this test was done (successfully) for this custom
+		 * sensor, a steinhart sensor might have been added changing
+		 * custom_table_size...
+		 */
+		if (st->custom_table_size + custom->size >
+		    (LTC2983_CUST_SENS_TBL_END_REG -
+		     LTC2983_CUST_SENS_TBL_START_REG) + 1) {
+			dev_err(dev,
+				"Not space left(%d) for new custom sensor(%zu)",
+				st->custom_table_size,
+				custom->size);
+			return -EINVAL;
+		}
+
+		custom->offset = st->custom_table_size /
+					LTC2983_CUSTOM_SENSOR_ENTRY_SZ;
+		st->custom_table_size += custom->size;
+	}
+
+	reg = (custom->offset * mult) + LTC2983_CUST_SENS_TBL_START_REG;
+
+	*chan_val |= LTC2983_CUSTOM_LEN(len);
+	*chan_val |= LTC2983_CUSTOM_ADDR(custom->offset);
+	dev_dbg(dev, "Assign custom sensor, reg:0x%04X, off:%d, sz:%zu",
+		reg, custom->offset,
+		custom->size);
+	/* write custom sensor table */
+	return regmap_bulk_write(st->regmap, reg, custom->table, custom->size);
+}
+
+static struct ltc2983_custom_sensor *
+__ltc2983_custom_sensor_new(struct ltc2983_data *st, const struct fwnode_handle *fn,
+			    const char *propname, const bool is_steinhart,
+			    const u32 resolution, const bool has_signed)
+{
+	struct ltc2983_custom_sensor *new_custom;
+	struct device *dev = &st->spi->dev;
+	/*
+	 * For custom steinhart, the full u32 is taken. For all the others
+	 * the MSB is discarded.
+	 */
+	const u8 n_size = is_steinhart ? 4 : 3;
+	u8 index, n_entries;
+	int ret;
+
+	if (is_steinhart)
+		n_entries = fwnode_property_count_u32(fn, propname);
+	else
+		n_entries = fwnode_property_count_u64(fn, propname);
+	/* n_entries must be an even number */
+	if (!n_entries || (n_entries % 2) != 0)
+		return dev_err_ptr_probe(dev, -EINVAL,
+					 "Number of entries either 0 or not even\n");
+
+	new_custom = devm_kzalloc(dev, sizeof(*new_custom), GFP_KERNEL);
+	if (!new_custom)
+		return ERR_PTR(-ENOMEM);
+
+	new_custom->size = n_entries * n_size;
+	/* check Steinhart size */
+	if (is_steinhart && new_custom->size != LTC2983_CUSTOM_STEINHART_SIZE)
+		return dev_err_ptr_probe(dev, -EINVAL,
+					 "Steinhart sensors size(%zu) must be %u\n",
+					 new_custom->size, LTC2983_CUSTOM_STEINHART_SIZE);
+
+	/* Check space on the table. */
+	if (st->custom_table_size + new_custom->size >
+	    (LTC2983_CUST_SENS_TBL_END_REG - LTC2983_CUST_SENS_TBL_START_REG) + 1)
+		return dev_err_ptr_probe(dev, -EINVAL,
+					 "No space left(%d) for new custom sensor(%zu)\n",
+					 st->custom_table_size, new_custom->size);
+
+	/* allocate the table */
+	if (is_steinhart)
+		new_custom->table = devm_kcalloc(dev, n_entries, sizeof(u32), GFP_KERNEL);
+	else
+		new_custom->table = devm_kcalloc(dev, n_entries, sizeof(u64), GFP_KERNEL);
+	if (!new_custom->table)
+		return ERR_PTR(-ENOMEM);
+
+	/*
+	 * Steinhart sensors are configured with raw values in the firmware
+	 * node. For the other sensors we must convert the value to raw.
+	 * The odd index's correspond to temperatures and always have 1/1024
+	 * of resolution. Temperatures also come in Kelvin, so signed values
+	 * are not possible.
+	 */
+	if (is_steinhart) {
+		ret = fwnode_property_read_u32_array(fn, propname, new_custom->table, n_entries);
+		if (ret < 0)
+			return ERR_PTR(ret);
+
+		cpu_to_be32_array(new_custom->table, new_custom->table, n_entries);
+	} else {
+		ret = fwnode_property_read_u64_array(fn, propname, new_custom->table, n_entries);
+		if (ret < 0)
+			return ERR_PTR(ret);
+
+		for (index = 0; index < n_entries; index++) {
+			u64 temp = ((u64 *)new_custom->table)[index];
+
+			/*
+			 * Users specify plain coverage percentage (0-100). Convert
+			 * to µK so __convert_to_raw() produces the correct hardware
+			 * encoding: P + 273.15 K.
+			 */
+			if ((index % 2) != 0 && !strcmp(propname, "adi,custom-leak-detector"))
+				temp = temp * 1000000 + 273150000;
+
+			if ((index % 2) != 0)
+				temp = __convert_to_raw(temp, 1024);
+			else if (has_signed && (s64)temp < 0)
+				temp = __convert_to_raw_sign(temp, resolution);
+			else
+				temp = __convert_to_raw(temp, resolution);
+
+			put_unaligned_be24(temp, new_custom->table + index * 3);
+		}
+	}
+
+	new_custom->is_steinhart = is_steinhart;
+	/*
+	 * This is done to first add all the steinhart sensors to the table,
+	 * in order to maximize the table usage. If we mix adding steinhart
+	 * with the other sensors, we might have to do some roundup to make
+	 * sure that sensor_addr - 0x250(start address) is a multiple of 4
+	 * (for steinhart), and a multiple of 6 for all the other sensors.
+	 * Since we have const 24 bytes for steinhart sensors and 24 is
+	 * also a multiple of 6, we guarantee that the first non-steinhart
+	 * sensor will sit in a correct address without the need of filling
+	 * addresses.
+	 */
+	if (is_steinhart) {
+		new_custom->offset = st->custom_table_size /
+					LTC2983_CUSTOM_STEINHART_ENTRY_SZ;
+		st->custom_table_size += new_custom->size;
+	} else {
+		/* mark as unset. This is checked later on the assign phase */
+		new_custom->offset = -1;
+	}
+
+	return new_custom;
+}
+
+static int ltc2983_thermocouple_fault_handler(const struct ltc2983_data *st,
+					      const u32 result)
+{
+	return __ltc2983_fault_handler(st, result,
+				       LTC2983_THERMOCOUPLE_HARD_FAULT_MASK,
+				       LTC2983_THERMOCOUPLE_SOFT_FAULT_MASK);
+}
+
+static int ltc2983_common_fault_handler(const struct ltc2983_data *st,
+					const u32 result)
+{
+	return __ltc2983_fault_handler(st, result,
+				       LTC2983_COMMON_HARD_FAULT_MASK,
+				       LTC2983_COMMON_SOFT_FAULT_MASK);
+}
+
+static int ltc2983_thermocouple_assign_chan(struct ltc2983_data *st,
+				const struct ltc2983_sensor *sensor)
+{
+	struct ltc2983_thermocouple *thermo = to_thermocouple(sensor);
+	u32 chan_val;
+
+	chan_val = LTC2983_CHAN_ASSIGN(thermo->cold_junction_chan);
+	chan_val |= LTC2983_THERMOCOUPLE_CFG(thermo->sensor_config);
+
+	if (thermo->custom) {
+		int ret;
+
+		ret = __ltc2983_chan_custom_sensor_assign(st, thermo->custom,
+							  &chan_val);
+		if (ret)
+			return ret;
+	}
+	return __ltc2983_chan_assign_common(st, sensor, chan_val);
+}
+
+static int ltc2983_rtd_assign_chan(struct ltc2983_data *st,
+				   const struct ltc2983_sensor *sensor)
+{
+	struct ltc2983_rtd *rtd = to_rtd(sensor);
+	u32 chan_val;
+
+	chan_val = LTC2983_CHAN_ASSIGN(rtd->r_sense_chan);
+	chan_val |= LTC2983_RTD_CFG(rtd->sensor_config);
+	chan_val |= LTC2983_RTD_EXC_CURRENT(rtd->excitation_current);
+	chan_val |= LTC2983_RTD_CURVE(rtd->rtd_curve);
+
+	if (rtd->custom) {
+		int ret;
+
+		ret = __ltc2983_chan_custom_sensor_assign(st, rtd->custom,
+							  &chan_val);
+		if (ret)
+			return ret;
+	}
+	return __ltc2983_chan_assign_common(st, sensor, chan_val);
+}
+
+static int ltc2983_copper_trace_assign_chan(struct ltc2983_data *st,
+					    const struct ltc2983_sensor *sensor)
+{
+	struct ltc2983_copper_trace *ct = to_copper_trace(sensor);
+	u32 chan_val;
+
+	chan_val = LTC2983_CHAN_ASSIGN(ct->r_sense_chan);
+	/* Sensor config bits 21:18 must be 0b1001 (ADT7604 datasheet Table 26) */
+	chan_val |= LTC2983_RTD_CFG(0x9);
+
+	if (ct->is_sub_ohm) {
+		chan_val &= ~GENMASK(17, 0);
+	} else {
+		int ret;
+
+		chan_val |= LTC2983_RTD_EXC_CURRENT(ct->excitation_current);
+		ret = __ltc2983_chan_custom_sensor_assign(st, ct->custom,
+							  &chan_val);
+		if (ret)
+			return ret;
+	}
+
+	return __ltc2983_chan_assign_common(st, sensor, chan_val);
+}
+
+static int ltc2983_thermistor_assign_chan(struct ltc2983_data *st,
+					  const struct ltc2983_sensor *sensor)
+{
+	struct ltc2983_thermistor *thermistor = to_thermistor(sensor);
+	u32 chan_val;
+
+	chan_val = LTC2983_CHAN_ASSIGN(thermistor->r_sense_chan);
+	chan_val |= LTC2983_THERMISTOR_CFG(thermistor->sensor_config);
+	chan_val |=
+		LTC2983_THERMISTOR_EXC_CURRENT(thermistor->excitation_current);
+
+	if (thermistor->custom) {
+		int ret;
+
+		ret = __ltc2983_chan_custom_sensor_assign(st,
+							  thermistor->custom,
+							  &chan_val);
+		if (ret)
+			return ret;
+	}
+	return __ltc2983_chan_assign_common(st, sensor, chan_val);
+}
+
+static int ltc2983_leak_detector_assign_chan(struct ltc2983_data *st,
+					     const struct ltc2983_sensor *sensor)
+{
+	struct ltc2983_leak_detector *ld = to_leak_detector(sensor);
+	u32 chan_val;
+	int ret;
+
+	chan_val = LTC2983_CHAN_ASSIGN(ld->r_sense_chan);
+	/* bits 21:19 must be 0b001 (ADT7604 datasheet Table 38) */
+	chan_val |= LTC2983_THERMISTOR_CFG(1);
+	chan_val |= LTC2983_THERMISTOR_EXC_CURRENT(ld->excitation_current);
+
+	ret = __ltc2983_chan_custom_sensor_assign(st, ld->custom, &chan_val);
+	if (ret)
+		return ret;
+
+	return __ltc2983_chan_assign_common(st, sensor, chan_val);
+}
+
+static int ltc2983_diode_assign_chan(struct ltc2983_data *st,
+				     const struct ltc2983_sensor *sensor)
+{
+	struct ltc2983_diode *diode = to_diode(sensor);
+	u32 chan_val;
+
+	chan_val = LTC2983_DIODE_CFG(diode->sensor_config);
+	chan_val |= LTC2983_DIODE_EXC_CURRENT(diode->excitation_current);
+	chan_val |= LTC2983_DIODE_IDEAL_FACTOR(diode->ideal_factor_value);
+
+	return __ltc2983_chan_assign_common(st, sensor, chan_val);
+}
+
+static int ltc2983_r_sense_assign_chan(struct ltc2983_data *st,
+				       const struct ltc2983_sensor *sensor)
+{
+	struct ltc2983_rsense *rsense = to_rsense(sensor);
+	u32 chan_val;
+
+	chan_val = LTC2983_R_SENSE_VAL(rsense->r_sense_val);
+
+	return __ltc2983_chan_assign_common(st, sensor, chan_val);
+}
+
+static int ltc2983_adc_assign_chan(struct ltc2983_data *st,
+				   const struct ltc2983_sensor *sensor)
+{
+	struct ltc2983_adc *adc = to_adc(sensor);
+	u32 chan_val;
+
+	chan_val = LTC2983_ADC_SINGLE_ENDED(adc->single_ended);
+
+	return __ltc2983_chan_assign_common(st, sensor, chan_val);
+}
+
+static int ltc2983_temp_assign_chan(struct ltc2983_data *st,
+				    const struct ltc2983_sensor *sensor)
+{
+	struct ltc2983_temp *temp = to_temp(sensor);
+	u32 chan_val;
+	int ret;
+
+	chan_val = LTC2983_ADC_SINGLE_ENDED(temp->single_ended);
+
+	ret = __ltc2983_chan_custom_sensor_assign(st, temp->custom, &chan_val);
+	if (ret)
+		return ret;
+
+	return __ltc2983_chan_assign_common(st, sensor, chan_val);
+}
+
+static struct ltc2983_sensor *
+ltc2983_thermocouple_new(const struct fwnode_handle *child, struct ltc2983_data *st,
+			 const struct ltc2983_sensor *sensor)
+{
+	struct device *dev = &st->spi->dev;
+	struct ltc2983_thermocouple *thermo;
+	u32 oc_current;
+	int ret;
+
+	thermo = devm_kzalloc(dev, sizeof(*thermo), GFP_KERNEL);
+	if (!thermo)
+		return ERR_PTR(-ENOMEM);
+
+	if (fwnode_property_read_bool(child, "adi,single-ended"))
+		thermo->sensor_config = LTC2983_THERMOCOUPLE_SGL(1);
+
+	if (fwnode_property_present(child, "adi,sensor-oc-current-microamp")) {
+		ret = fwnode_property_read_u32(child,
+					       "adi,sensor-oc-current-microamp",
+					       &oc_current);
+		if (ret)
+			return dev_err_ptr_probe(dev, ret,
+						 "Failed to read adi,sensor-oc-current-microamp\n");
+
+		switch (oc_current) {
+		case 10:
+			thermo->sensor_config |=
+					LTC2983_THERMOCOUPLE_OC_CURR(0);
+			break;
+		case 100:
+			thermo->sensor_config |=
+					LTC2983_THERMOCOUPLE_OC_CURR(1);
+			break;
+		case 500:
+			thermo->sensor_config |=
+					LTC2983_THERMOCOUPLE_OC_CURR(2);
+			break;
+		case 1000:
+			thermo->sensor_config |=
+					LTC2983_THERMOCOUPLE_OC_CURR(3);
+			break;
+		default:
+			return dev_err_ptr_probe(dev, -EINVAL,
+						 "Invalid open circuit current:%u\n",
+						 oc_current);
+		}
+
+		thermo->sensor_config |= LTC2983_THERMOCOUPLE_OC_CHECK(1);
+	}
+	/* validate channel index */
+	if (!(thermo->sensor_config & LTC2983_THERMOCOUPLE_DIFF_MASK) &&
+	    sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN)
+		return dev_err_ptr_probe(dev, -EINVAL,
+					 "Invalid channel %d for differential thermocouple\n",
+					 sensor->chan);
+
+	struct fwnode_handle *ref __free(fwnode_handle) =
+		fwnode_find_reference(child, "adi,cold-junction-handle", 0);
+	if (IS_ERR(ref)) {
+		ref = NULL;
+	} else {
+		ret = fwnode_property_read_u32(ref, "reg", &thermo->cold_junction_chan);
+		if (ret)
+			/*
+			 * This would be caught later but we can just return
+			 * the error right away.
+			 */
+			return dev_err_ptr_probe(dev, ret,
+						 "Property reg must be given\n");
+	}
+
+	/* check custom sensor */
+	if (sensor->type == LTC2983_SENSOR_THERMOCOUPLE_CUSTOM) {
+		const char *propname = "adi,custom-thermocouple";
+
+		thermo->custom = __ltc2983_custom_sensor_new(st, child,
+							     propname, false,
+							     16384, true);
+		if (IS_ERR(thermo->custom))
+			return ERR_CAST(thermo->custom);
+	}
+
+	/* set common parameters */
+	thermo->sensor.fault_handler = ltc2983_thermocouple_fault_handler;
+	thermo->sensor.assign_chan = ltc2983_thermocouple_assign_chan;
+
+	return &thermo->sensor;
+}
+
+static struct ltc2983_sensor *
+ltc2983_rtd_new(const struct fwnode_handle *child, struct ltc2983_data *st,
+		const struct ltc2983_sensor *sensor)
+{
+	struct ltc2983_rtd *rtd;
+	int ret = 0;
+	struct device *dev = &st->spi->dev;
+	u32 excitation_current = 0, n_wires = 2;
+
+	rtd = devm_kzalloc(dev, sizeof(*rtd), GFP_KERNEL);
+	if (!rtd)
+		return ERR_PTR(-ENOMEM);
+
+	struct fwnode_handle *ref __free(fwnode_handle) =
+		fwnode_find_reference(child, "adi,rsense-handle", 0);
+	if (IS_ERR(ref))
+		return dev_err_cast_probe(dev, ref,
+					  "Property adi,rsense-handle missing or invalid\n");
+
+	ret = fwnode_property_read_u32(ref, "reg", &rtd->r_sense_chan);
+	if (ret)
+		return dev_err_ptr_probe(dev, ret,
+					 "Property reg must be given\n");
+
+	if (fwnode_property_present(child, "adi,number-of-wires")) {
+		ret = fwnode_property_read_u32(child, "adi,number-of-wires", &n_wires);
+		if (ret)
+			return dev_err_ptr_probe(dev, ret,
+						 "Failed to read adi,number-of-wires\n");
+
+		switch (n_wires) {
+		case 2:
+			rtd->sensor_config = LTC2983_RTD_N_WIRES(0);
+			break;
+		case 3:
+			rtd->sensor_config = LTC2983_RTD_N_WIRES(1);
+			break;
+		case 4:
+			rtd->sensor_config = LTC2983_RTD_N_WIRES(2);
+			break;
+		case 5:
+			/* 4 wires, Kelvin Rsense */
+			rtd->sensor_config = LTC2983_RTD_N_WIRES(3);
+			break;
+		default:
+			return dev_err_ptr_probe(dev, -EINVAL,
+						 "Invalid number of wires:%u\n",
+						 n_wires);
+		}
+	}
+
+	if (fwnode_property_read_bool(child, "adi,rsense-share")) {
+		/* Current rotation is only available with rsense sharing */
+		if (fwnode_property_read_bool(child, "adi,current-rotate")) {
+			if (n_wires == 2 || n_wires == 3)
+				return dev_err_ptr_probe(dev, -EINVAL,
+							 "Rotation not allowed for 2/3 Wire RTDs\n");
+
+			rtd->sensor_config |= LTC2983_RTD_C_ROTATE(1);
+		} else {
+			rtd->sensor_config |= LTC2983_RTD_R_SHARE(1);
+		}
+	}
+	/*
+	 * rtd channel indexes are a bit more complicated to validate.
+	 * For 4wire RTD with rotation, the channel selection cannot be
+	 * >=19 since the channel + 1 is used in this configuration.
+	 * For 4wire RTDs with kelvin rsense, the rsense channel cannot be
+	 * <=1 since channel - 1 and channel - 2 are used.
+	 */
+	if (rtd->sensor_config & LTC2983_RTD_4_WIRE_MASK) {
+		/* 4-wire */
+		u8 min = LTC2983_DIFFERENTIAL_CHAN_MIN,
+			max = st->info->max_channels_nr;
+
+		if (rtd->sensor_config & LTC2983_RTD_ROTATION_MASK)
+			max = st->info->max_channels_nr - 1;
+
+		if (((rtd->sensor_config & LTC2983_RTD_KELVIN_R_SENSE_MASK)
+		     == LTC2983_RTD_KELVIN_R_SENSE_MASK) &&
+		    (rtd->r_sense_chan <=  min))
+			/* kelvin rsense*/
+			return dev_err_ptr_probe(dev, -EINVAL,
+						 "Invalid channel %d for kelvin rsense\n",
+						 rtd->r_sense_chan);
+
+		if (sensor->chan < min || sensor->chan > max)
+			return dev_err_ptr_probe(dev, -EINVAL,
+						 "Invalid channel %d for RTD config\n",
+						 sensor->chan);
+	} else {
+		/* same as differential case */
+		if (sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN)
+			return dev_err_ptr_probe(dev, -EINVAL,
+						 "Invalid channel %d for RTD\n",
+						 sensor->chan);
+	}
+
+	/* check custom sensor */
+	if (sensor->type == LTC2983_SENSOR_RTD_CUSTOM) {
+		rtd->custom = __ltc2983_custom_sensor_new(st, child,
+							  "adi,custom-rtd",
+							  false, 2048, false);
+		if (IS_ERR(rtd->custom))
+			return ERR_CAST(rtd->custom);
+	}
+
+	/* set common parameters */
+	rtd->sensor.fault_handler = ltc2983_common_fault_handler;
+	rtd->sensor.assign_chan = ltc2983_rtd_assign_chan;
+
+	if (fwnode_property_present(child, "adi,excitation-current-microamp")) {
+		ret = fwnode_property_read_u32(child, "adi,excitation-current-microamp",
+					       &excitation_current);
+		if (ret)
+			return dev_err_ptr_probe(dev, ret,
+						 "Failed to read adi,excitation-current-microamp\n");
+
+		switch (excitation_current) {
+		case 5:
+			rtd->excitation_current = 0x01;
+			break;
+		case 10:
+			rtd->excitation_current = 0x02;
+			break;
+		case 25:
+			rtd->excitation_current = 0x03;
+			break;
+		case 50:
+			rtd->excitation_current = 0x04;
+			break;
+		case 100:
+			rtd->excitation_current = 0x05;
+			break;
+		case 250:
+			rtd->excitation_current = 0x06;
+			break;
+		case 500:
+			rtd->excitation_current = 0x07;
+			break;
+		case 1000:
+			rtd->excitation_current = 0x08;
+			break;
+		default:
+			return dev_err_ptr_probe(dev, -EINVAL,
+						 "Invalid value for excitation current(%u)\n",
+						 excitation_current);
+		}
+	} else {
+		/* default to 5uA */
+		rtd->excitation_current = 1;
+	}
+
+	if (fwnode_property_present(child, "adi,rtd-curve")) {
+		ret = fwnode_property_read_u32(child, "adi,rtd-curve", &rtd->rtd_curve);
+		if (ret)
+			return dev_err_ptr_probe(dev, ret,
+						 "Failed to read adi,rtd-curve\n");
+	}
+
+	return &rtd->sensor;
+}
+
+static struct ltc2983_sensor *
+ltc2983_thermistor_new(const struct fwnode_handle *child, struct ltc2983_data *st,
+		       const struct ltc2983_sensor *sensor)
+{
+	struct ltc2983_thermistor *thermistor;
+	struct device *dev = &st->spi->dev;
+	u32 excitation_current = 0;
+	int ret = 0;
+
+	thermistor = devm_kzalloc(dev, sizeof(*thermistor), GFP_KERNEL);
+	if (!thermistor)
+		return ERR_PTR(-ENOMEM);
+
+	struct fwnode_handle *ref __free(fwnode_handle) =
+		fwnode_find_reference(child, "adi,rsense-handle", 0);
+	if (IS_ERR(ref))
+		return dev_err_cast_probe(dev, ref,
+					  "Property adi,rsense-handle missing or invalid\n");
+
+	ret = fwnode_property_read_u32(ref, "reg", &thermistor->r_sense_chan);
+	if (ret)
+		return dev_err_ptr_probe(dev, ret,
+					 "rsense channel must be configured...\n");
+
+	if (fwnode_property_read_bool(child, "adi,single-ended")) {
+		thermistor->sensor_config = LTC2983_THERMISTOR_SGL(1);
+	} else if (fwnode_property_read_bool(child, "adi,rsense-share")) {
+		/* rotation is only possible if sharing rsense */
+		if (fwnode_property_read_bool(child, "adi,current-rotate"))
+			thermistor->sensor_config =
+						LTC2983_THERMISTOR_C_ROTATE(1);
+		else
+			thermistor->sensor_config =
+						LTC2983_THERMISTOR_R_SHARE(1);
+	}
+	/* validate channel index */
+	if (!(thermistor->sensor_config & LTC2983_THERMISTOR_DIFF_MASK) &&
+	    sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN)
+		return dev_err_ptr_probe(dev, -EINVAL,
+					 "Invalid channel %d for differential thermistor\n",
+					 sensor->chan);
+
+	/* check custom sensor */
+	if (sensor->type >= LTC2983_SENSOR_THERMISTOR_STEINHART) {
+		bool steinhart = false;
+		const char *propname;
+
+		if (sensor->type == LTC2983_SENSOR_THERMISTOR_STEINHART) {
+			steinhart = true;
+			propname = "adi,custom-steinhart";
+		} else {
+			propname = "adi,custom-thermistor";
+		}
+
+		thermistor->custom = __ltc2983_custom_sensor_new(st, child,
+								 propname,
+								 steinhart,
+								 64, false);
+		if (IS_ERR(thermistor->custom))
+			return ERR_CAST(thermistor->custom);
+	}
+	/* set common parameters */
+	thermistor->sensor.fault_handler = ltc2983_common_fault_handler;
+	thermistor->sensor.assign_chan = ltc2983_thermistor_assign_chan;
+
+	if (fwnode_property_present(child, "adi,excitation-current-nanoamp")) {
+		ret = fwnode_property_read_u32(child, "adi,excitation-current-nanoamp",
+					       &excitation_current);
+		if (ret)
+			return dev_err_ptr_probe(dev, ret,
+						 "Failed to read adi,excitation-current-nanoamp\n");
+
+		switch (excitation_current) {
+		case 0:
+			/* auto range */
+			if (sensor->type >= LTC2983_SENSOR_THERMISTOR_STEINHART)
+				return dev_err_ptr_probe(dev, -EINVAL,
+							 "Auto Range not allowed for custom sensors\n");
+
+			thermistor->excitation_current = 0x0c;
+			break;
+		case 250:
+			thermistor->excitation_current = 0x01;
+			break;
+		case 500:
+			thermistor->excitation_current = 0x02;
+			break;
+		case 1000:
+			thermistor->excitation_current = 0x03;
+			break;
+		case 5000:
+			thermistor->excitation_current = 0x04;
+			break;
+		case 10000:
+			thermistor->excitation_current = 0x05;
+			break;
+		case 25000:
+			thermistor->excitation_current = 0x06;
+			break;
+		case 50000:
+			thermistor->excitation_current = 0x07;
+			break;
+		case 100000:
+			thermistor->excitation_current = 0x08;
+			break;
+		case 250000:
+			thermistor->excitation_current = 0x09;
+			break;
+		case 500000:
+			thermistor->excitation_current = 0x0a;
+			break;
+		case 1000000:
+			thermistor->excitation_current = 0x0b;
+			break;
+		default:
+			return dev_err_ptr_probe(dev, -EINVAL,
+						 "Invalid value for excitation current(%u)\n",
+						 excitation_current);
+		}
+	} else {
+		/* Auto range is not allowed for custom sensors */
+		if (sensor->type >= LTC2983_SENSOR_THERMISTOR_STEINHART)
+			/* default to 1uA */
+			thermistor->excitation_current = 0x03;
+		else
+			/* default to auto-range */
+			thermistor->excitation_current = 0x0c;
+	}
+
+	return &thermistor->sensor;
+}
+
+static struct ltc2983_sensor *
+ltc2983_copper_trace_new(const struct fwnode_handle *child, struct ltc2983_data *st,
+			 const struct ltc2983_sensor *sensor)
+{
+	struct device *dev = &st->spi->dev;
+	struct ltc2983_copper_trace *ct;
+	int ret;
+
+	if (sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN)
+		return dev_err_ptr_probe(dev, -EINVAL,
+					 "Invalid channel %d for copper trace\n",
+					 sensor->chan);
+
+	ct = devm_kzalloc(dev, sizeof(*ct), GFP_KERNEL);
+	if (!ct)
+		return ERR_PTR(-ENOMEM);
+
+	struct fwnode_handle *ref __free(fwnode_handle) =
+		fwnode_find_reference(child, "adi,rsense-handle", 0);
+	if (IS_ERR(ref))
+		return dev_err_cast_probe(dev, ref,
+					  "Property adi,rsense-handle missing or invalid\n");
+
+	ret = fwnode_property_read_u32(ref, "reg", &ct->r_sense_chan);
+	if (ret)
+		return dev_err_ptr_probe(dev, ret, "Property reg must be given\n");
+
+	ct->is_sub_ohm = fwnode_property_read_bool(child, "adi,copper-trace-sub-ohm");
+
+	if (ct->is_sub_ohm && fwnode_property_present(child, "adi,custom-copper-trace"))
+		return dev_err_ptr_probe(dev, -EINVAL,
+					 "sub-ohm copper trace cannot have a custom table\n");
+
+	if (!ct->is_sub_ohm) {
+		u32 excitation_current = 0;
+
+		if (!fwnode_property_present(child, "adi,custom-copper-trace"))
+			return dev_err_ptr_probe(dev, -EINVAL,
+						 "adi,custom-copper-trace is required for >1 ohm copper trace\n");
+
+		ct->custom = __ltc2983_custom_sensor_new(st, child, "adi,custom-copper-trace",
+							 false, 2048, false);
+		if (IS_ERR(ct->custom))
+			return ERR_CAST(ct->custom);
+
+		if (fwnode_property_present(child, "adi,excitation-current-microamp")) {
+			ret = fwnode_property_read_u32(child, "adi,excitation-current-microamp",
+						       &excitation_current);
+			if (ret)
+				return dev_err_ptr_probe(dev, ret,
+							 "Failed to read adi,excitation-current-microamp\n");
+
+			switch (excitation_current) {
+			case 5:
+				ct->excitation_current = 0x01;
+				break;
+			case 10:
+				ct->excitation_current = 0x02;
+				break;
+			case 25:
+				ct->excitation_current = 0x03;
+				break;
+			case 50:
+				ct->excitation_current = 0x04;
+				break;
+			case 100:
+				ct->excitation_current = 0x05;
+				break;
+			case 250:
+				ct->excitation_current = 0x06;
+				break;
+			case 500:
+				ct->excitation_current = 0x07;
+				break;
+			case 1000:
+				ct->excitation_current = 0x08;
+				break;
+			default:
+				return dev_err_ptr_probe(dev, -EINVAL,
+							 "Invalid value for excitation current(%u)\n",
+							 excitation_current);
+			}
+		} else {
+			/* default to 1mA per datasheet recommendation for copper trace */
+			ct->excitation_current = 0x08;
+		}
+	}
+
+	ct->sensor.fault_handler = ltc2983_common_fault_handler;
+	ct->sensor.assign_chan = ltc2983_copper_trace_assign_chan;
+	if (ct->is_sub_ohm)
+		ct->sensor.n_iio_chan = 1;
+	else
+		ct->sensor.n_iio_chan = 2;
+
+	return &ct->sensor;
+}
+
+static struct ltc2983_sensor *
+ltc2983_leak_detector_new(const struct fwnode_handle *child, struct ltc2983_data *st,
+			  const struct ltc2983_sensor *sensor)
+{
+	struct device *dev = &st->spi->dev;
+	struct ltc2983_leak_detector *ld;
+	int ret;
+	u32 excitation_current = 0;
+
+	if (sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN)
+		return dev_err_ptr_probe(dev, -EINVAL,
+					 "Invalid channel %d for leak detector\n",
+					 sensor->chan);
+
+	ld = devm_kzalloc(dev, sizeof(*ld), GFP_KERNEL);
+	if (!ld)
+		return ERR_PTR(-ENOMEM);
+
+	struct fwnode_handle *ref __free(fwnode_handle) =
+		fwnode_find_reference(child, "adi,rsense-handle", 0);
+	if (IS_ERR(ref))
+		return dev_err_cast_probe(dev, ref,
+					  "Property adi,rsense-handle missing or invalid\n");
+
+	ret = fwnode_property_read_u32(ref, "reg", &ld->r_sense_chan);
+	if (ret)
+		return dev_err_ptr_probe(dev, ret,
+					 "rsense channel must be configured\n");
+
+	if (!fwnode_property_present(child, "adi,custom-leak-detector"))
+		return dev_err_ptr_probe(dev, -EINVAL,
+					 "adi,custom-leak-detector is required for leak detectors\n");
+
+	ld->custom = __ltc2983_custom_sensor_new(st, child, "adi,custom-leak-detector",
+						 false, 16, false);
+	if (IS_ERR(ld->custom))
+		return ERR_CAST(ld->custom);
+
+	ret = fwnode_property_read_u32(child, "adi,excitation-current-nanoamp",
+				       &excitation_current);
+	if (ret)
+		return dev_err_ptr_probe(dev, ret,
+					 "adi,excitation-current-nanoamp is required for leak detectors\n");
+
+	switch (excitation_current) {
+	case 250:
+		ld->excitation_current = 0x01;
+		break;
+	case 500:
+		ld->excitation_current = 0x02;
+		break;
+	case 1000:
+		ld->excitation_current = 0x03;
+		break;
+	case 5000:
+		ld->excitation_current = 0x04;
+		break;
+	case 10000:
+		ld->excitation_current = 0x05;
+		break;
+	case 25000:
+		ld->excitation_current = 0x06;
+		break;
+	case 50000:
+		ld->excitation_current = 0x07;
+		break;
+	case 100000:
+		ld->excitation_current = 0x08;
+		break;
+	case 250000:
+		ld->excitation_current = 0x09;
+		break;
+	case 500000:
+		ld->excitation_current = 0x0a;
+		break;
+	case 1000000:
+		ld->excitation_current = 0x0b;
+		break;
+	default:
+		return dev_err_ptr_probe(dev, -EINVAL,
+					 "Invalid value for excitation current(%u)\n",
+					 excitation_current);
+	}
+
+	ld->sensor.fault_handler = ltc2983_common_fault_handler;
+	ld->sensor.assign_chan = ltc2983_leak_detector_assign_chan;
+	ld->sensor.n_iio_chan = 2;
+
+	return &ld->sensor;
+}
+
+static struct ltc2983_sensor *
+ltc2983_diode_new(const struct fwnode_handle *child, const struct ltc2983_data *st,
+		  const struct ltc2983_sensor *sensor)
+{
+	struct device *dev = &st->spi->dev;
+	struct ltc2983_diode *diode;
+	u32 temp = 0, excitation_current = 0;
+	int ret;
+
+	diode = devm_kzalloc(dev, sizeof(*diode), GFP_KERNEL);
+	if (!diode)
+		return ERR_PTR(-ENOMEM);
+
+	if (fwnode_property_read_bool(child, "adi,single-ended"))
+		diode->sensor_config = LTC2983_DIODE_SGL(1);
+
+	if (fwnode_property_read_bool(child, "adi,three-conversion-cycles"))
+		diode->sensor_config |= LTC2983_DIODE_3_CONV_CYCLE(1);
+
+	if (fwnode_property_read_bool(child, "adi,average-on"))
+		diode->sensor_config |= LTC2983_DIODE_AVERAGE_ON(1);
+
+	/* validate channel index */
+	if (!(diode->sensor_config & LTC2983_DIODE_DIFF_MASK) &&
+	    sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN)
+		return dev_err_ptr_probe(dev, -EINVAL,
+					 "Invalid channel %d for differential diode\n",
+					 sensor->chan);
+
+	/* set common parameters */
+	diode->sensor.fault_handler = ltc2983_common_fault_handler;
+	diode->sensor.assign_chan = ltc2983_diode_assign_chan;
+
+	if (fwnode_property_present(child, "adi,excitation-current-microamp")) {
+		ret = fwnode_property_read_u32(child, "adi,excitation-current-microamp",
+					       &excitation_current);
+		if (ret)
+			return dev_err_ptr_probe(dev, ret,
+						 "Failed to read adi,excitation-current-microamp\n");
+
+		switch (excitation_current) {
+		case 10:
+			diode->excitation_current = 0x00;
+			break;
+		case 20:
+			diode->excitation_current = 0x01;
+			break;
+		case 40:
+			diode->excitation_current = 0x02;
+			break;
+		case 80:
+			diode->excitation_current = 0x03;
+			break;
+		default:
+			return dev_err_ptr_probe(dev, -EINVAL,
+						 "Invalid value for excitation current(%u)\n",
+						 excitation_current);
+		}
+	}
+
+	if (fwnode_property_present(child, "adi,ideal-factor-value")) {
+		ret = fwnode_property_read_u32(child, "adi,ideal-factor-value", &temp);
+		if (ret)
+			return dev_err_ptr_probe(dev, ret,
+						 "Failed to read adi,ideal-factor-value\n");
+	}
+
+	/* 2^20 resolution */
+	diode->ideal_factor_value = __convert_to_raw(temp, 1048576);
+
+	return &diode->sensor;
+}
+
+static struct ltc2983_sensor *ltc2983_r_sense_new(struct fwnode_handle *child,
+					struct ltc2983_data *st,
+					const struct ltc2983_sensor *sensor)
+{
+	struct device *dev = &st->spi->dev;
+	struct ltc2983_rsense *rsense;
+	int ret;
+	u32 temp;
+
+	rsense = devm_kzalloc(dev, sizeof(*rsense), GFP_KERNEL);
+	if (!rsense)
+		return ERR_PTR(-ENOMEM);
+
+	/* validate channel index */
+	if (sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN)
+		return dev_err_ptr_probe(dev, -EINVAL,
+					 "Invalid channel %d for r_sense\n",
+					 sensor->chan);
+
+	ret = fwnode_property_read_u32(child, "adi,rsense-val-milli-ohms", &temp);
+	if (ret)
+		return dev_err_ptr_probe(dev, -EINVAL,
+					 "Property adi,rsense-val-milli-ohms missing\n");
+	/*
+	 * Times 1000 because we have milli-ohms and __convert_to_raw
+	 * expects scales of 1000000 which are used for all other
+	 * properties.
+	 * 2^10 resolution
+	 */
+	rsense->r_sense_val = __convert_to_raw((u64)temp * 1000, 1024);
+
+	/* set common parameters */
+	rsense->sensor.assign_chan = ltc2983_r_sense_assign_chan;
+
+	return &rsense->sensor;
+}
+
+static struct ltc2983_sensor *ltc2983_adc_new(struct fwnode_handle *child,
+					 struct ltc2983_data *st,
+					 const struct ltc2983_sensor *sensor)
+{
+	struct device *dev = &st->spi->dev;
+	struct ltc2983_adc *adc;
+
+	adc = devm_kzalloc(dev, sizeof(*adc), GFP_KERNEL);
+	if (!adc)
+		return ERR_PTR(-ENOMEM);
+
+	if (fwnode_property_read_bool(child, "adi,single-ended"))
+		adc->single_ended = true;
+
+	if (!adc->single_ended && sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN)
+		return dev_err_ptr_probe(dev, -EINVAL,
+					 "Invalid channel %d for differential ADC\n",
+					 sensor->chan);
+
+	/* set common parameters */
+	adc->sensor.assign_chan = ltc2983_adc_assign_chan;
+	adc->sensor.fault_handler = ltc2983_common_fault_handler;
+
+	return &adc->sensor;
+}
+
+static struct ltc2983_sensor *ltc2983_temp_new(struct fwnode_handle *child,
+					       struct ltc2983_data *st,
+					       const struct ltc2983_sensor *sensor)
+{
+	struct device *dev = &st->spi->dev;
+	struct ltc2983_temp *temp;
+
+	temp = devm_kzalloc(dev, sizeof(*temp), GFP_KERNEL);
+	if (!temp)
+		return ERR_PTR(-ENOMEM);
+
+	if (fwnode_property_read_bool(child, "adi,single-ended"))
+		temp->single_ended = true;
+
+	if (!temp->single_ended && sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN)
+		return dev_err_ptr_probe(dev, -EINVAL,
+					 "Invalid channel %d for differential temp\n",
+					 sensor->chan);
+
+	temp->custom = __ltc2983_custom_sensor_new(st, child, "adi,custom-temp",
+						   false, 4096, true);
+	if (IS_ERR(temp->custom))
+		return ERR_CAST(temp->custom);
+
+	/* set common parameters */
+	temp->sensor.assign_chan = ltc2983_temp_assign_chan;
+	temp->sensor.fault_handler = ltc2983_common_fault_handler;
+
+	return &temp->sensor;
+}
+
+static int ltc2983_chan_read(struct ltc2983_data *st,
+			const struct ltc2983_sensor *sensor,
+			u32 base_reg, int *val)
+{
+	struct device *dev = &st->spi->dev;
+	u32 start_conversion = 0;
+	int ret;
+	unsigned long time;
+
+	start_conversion = LTC2983_STATUS_START(true);
+	start_conversion |= LTC2983_STATUS_CHAN_SEL(sensor->chan);
+	dev_dbg(dev, "Start conversion on channel:%d, status:%02X\n",
+		sensor->chan, start_conversion);
+	reinit_completion(&st->completion);
+	/* start conversion */
+	ret = regmap_write(st->regmap, LTC2983_STATUS_REG, start_conversion);
+	if (ret)
+		return ret;
+	/*
+	 * wait for conversion to complete.
+	 * 300 ms should be more than enough to complete the conversion.
+	 * Depending on the sensor configuration, there are 2/3 conversions
+	 * cycles of 82ms.
+	 */
+	time = wait_for_completion_timeout(&st->completion,
+					   msecs_to_jiffies(300));
+	if (!time) {
+		dev_warn(dev, "Conversion timed out\n");
+		return -ETIMEDOUT;
+	}
+
+	/* read the converted data */
+	ret = regmap_bulk_read(st->regmap, LTC2983_RESULT_ADDR(sensor->chan, base_reg),
+			       &st->temp, sizeof(st->temp));
+	if (ret)
+		return ret;
+
+	*val = __be32_to_cpu(st->temp);
+
+	if (base_reg == ADT7604_RES_RES_START_REG) {
+		/*
+		 * Resistance result register gives a plain unsigned value,
+		 * D31 is always 0, no valid bit, no fault bits. Read bits[30:0]
+		 * directly — the temperature result format does not apply here.
+		 */
+		*val &= GENMASK(30, 0);
+		return 0;
+	}
+
+	if (!(LTC2983_RES_VALID_MASK & *val)) {
+		dev_err(dev, "Invalid conversion detected\n");
+		return -EIO;
+	}
+
+	ret = sensor->fault_handler(st, *val);
+	if (ret)
+		return ret;
+
+	*val = sign_extend32((*val) & LTC2983_DATA_MASK, LTC2983_DATA_SIGN_BIT);
+	return 0;
+}
+
+static int ltc2983_read_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int *val, int *val2, long mask)
+{
+	struct ltc2983_data *st = iio_priv(indio_dev);
+	struct device *dev = &st->spi->dev;
+	int ret;
+
+	/* sanity check */
+	if (chan->address >= st->num_channels) {
+		dev_err(dev, "Invalid channel address: %ld\n", chan->address);
+		return -EINVAL;
+	}
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		mutex_lock(&st->lock);
+		switch (chan->type) {
+		case IIO_RESISTANCE:
+			ret = ltc2983_chan_read(st, st->sensors[chan->address],
+						ADT7604_RES_RES_START_REG, val);
+			break;
+		default:
+			ret = ltc2983_chan_read(st, st->sensors[chan->address],
+						LTC2983_TEMP_RES_START_REG, val);
+			break;
+		}
+		mutex_unlock(&st->lock);
+		return ret ?: IIO_VAL_INT;
+	case IIO_CHAN_INFO_SCALE:
+		switch (chan->type) {
+		case IIO_TEMP:
+			/* value in milli degrees */
+			*val = 1000;
+			/* 2^10 */
+			*val2 = 1024;
+			return IIO_VAL_FRACTIONAL;
+		case IIO_VOLTAGE:
+			/* value in millivolt */
+			*val = 1000;
+			/* 2^21 */
+			*val2 = 2097152;
+			return IIO_VAL_FRACTIONAL;
+		case IIO_RESISTANCE:
+		case IIO_COVERAGE:
+			/* value in ohm/percent */
+			*val = 1;
+			/* 2^10 */
+			*val2 = 1024;
+			return IIO_VAL_FRACTIONAL;
+		default:
+			return -EINVAL;
+		}
+	}
+
+	return -EINVAL;
+}
+
+static int ltc2983_reg_access(struct iio_dev *indio_dev,
+			      unsigned int reg,
+			      unsigned int writeval,
+			      unsigned int *readval)
+{
+	struct ltc2983_data *st = iio_priv(indio_dev);
+
+	if (readval)
+		return regmap_read(st->regmap, reg, readval);
+
+	return regmap_write(st->regmap, reg, writeval);
+}
+
+static irqreturn_t ltc2983_irq_handler(int irq, void *data)
+{
+	struct ltc2983_data *st = data;
+
+	complete(&st->completion);
+	return IRQ_HANDLED;
+}
+
+#define LTC2983_CHAN(__type, index, __address) ({ \
+	struct iio_chan_spec __chan = { \
+		.type = __type, \
+		.indexed = 1, \
+		.channel = index, \
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+		.address = __address, \
+	}; \
+	__chan; \
+})
+
+static int ltc2983_parse_fw(struct ltc2983_data *st)
+{
+	struct device *dev = &st->spi->dev;
+	int ret, chan = 0, channel_avail_mask = 0;
+
+	device_property_read_u32(dev, "adi,mux-delay-config-us", &st->mux_delay_config);
+
+	device_property_read_u32(dev, "adi,filter-notch-freq", &st->filter_notch_freq);
+
+	st->num_channels = device_get_child_node_count(dev);
+	if (!st->num_channels)
+		return dev_err_probe(dev, -EINVAL,
+				     "At least one channel must be given!\n");
+
+	st->sensors = devm_kcalloc(dev, st->num_channels, sizeof(*st->sensors),
+				   GFP_KERNEL);
+	if (!st->sensors)
+		return -ENOMEM;
+
+	st->iio_channels = 0;
+	device_for_each_child_node_scoped(dev, child) {
+		struct ltc2983_sensor sensor;
+
+		ret = fwnode_property_read_u32(child, "reg", &sensor.chan);
+		if (ret)
+			return dev_err_probe(dev, ret,
+				"reg property must given for child nodes\n");
+
+		/* check if we have a valid channel */
+		if (sensor.chan < LTC2983_MIN_CHANNELS_NR ||
+		    sensor.chan > st->info->max_channels_nr)
+			return dev_err_probe(dev, -EINVAL,
+					     "channel:%d must be from %u to %u\n",
+					     sensor.chan,
+					     LTC2983_MIN_CHANNELS_NR,
+					     st->info->max_channels_nr);
+
+		if (channel_avail_mask & BIT(sensor.chan))
+			return dev_err_probe(dev, -EINVAL,
+					     "channel:%d already in use\n",
+					     sensor.chan);
+
+		ret = fwnode_property_read_u32(child, "adi,sensor-type", &sensor.type);
+		if (ret)
+			return dev_err_probe(dev, ret,
+				"adi,sensor-type property must given for child nodes\n");
+
+		if (sensor.type >= LTC2983_SENSOR_NUM ||
+		    !(st->info->supported_sensors & BIT_ULL(sensor.type)))
+			return dev_err_probe(dev, -EINVAL,
+					     "sensor type %d not supported on %s\n",
+					     sensor.type, st->info->name);
+
+		dev_dbg(dev, "Create new sensor, type %u, channel %u",
+			sensor.type, sensor.chan);
+
+		if (sensor.type >= LTC2983_SENSOR_THERMOCOUPLE &&
+		    sensor.type <= LTC2983_SENSOR_THERMOCOUPLE_CUSTOM) {
+			st->sensors[chan] = ltc2983_thermocouple_new(child, st,
+								     &sensor);
+		} else if (sensor.type >= LTC2983_SENSOR_RTD &&
+			   sensor.type <= LTC2983_SENSOR_RTD_CUSTOM) {
+			st->sensors[chan] = ltc2983_rtd_new(child, st, &sensor);
+		} else if (sensor.type >= LTC2983_SENSOR_THERMISTOR &&
+			   sensor.type <= LTC2983_SENSOR_THERMISTOR_CUSTOM) {
+			st->sensors[chan] = ltc2983_thermistor_new(child, st,
+								   &sensor);
+		} else if (sensor.type == LTC2983_SENSOR_DIODE) {
+			st->sensors[chan] = ltc2983_diode_new(child, st,
+							      &sensor);
+		} else if (sensor.type == LTC2983_SENSOR_SENSE_RESISTOR) {
+			st->sensors[chan] = ltc2983_r_sense_new(child, st,
+								&sensor);
+		} else if (sensor.type == LTC2983_SENSOR_DIRECT_ADC) {
+			st->sensors[chan] = ltc2983_adc_new(child, st, &sensor);
+		} else if (sensor.type == LTC2983_SENSOR_ACTIVE_TEMP) {
+			st->sensors[chan] = ltc2983_temp_new(child, st, &sensor);
+		} else if (sensor.type == LTC2983_SENSOR_COPPER_TRACE) {
+			st->sensors[chan] = ltc2983_copper_trace_new(child, st, &sensor);
+		} else if (sensor.type == LTC2983_SENSOR_LEAK_DETECTOR) {
+			st->sensors[chan] = ltc2983_leak_detector_new(child, st, &sensor);
+		} else {
+			return dev_err_probe(dev, -EINVAL,
+					     "Unknown sensor type %d\n",
+					     sensor.type);
+		}
+
+		if (IS_ERR(st->sensors[chan]))
+			return dev_err_probe(dev, PTR_ERR(st->sensors[chan]),
+					     "Failed to create sensor\n");
+
+		/* set generic sensor parameters */
+		st->sensors[chan]->chan = sensor.chan;
+		st->sensors[chan]->type = sensor.type;
+
+		/*
+		 * Dedicated functions set n_iio_chan themselves; for all other
+		 * sensor types rsense produces 0 channels, everything else 1.
+		 */
+		if (!st->sensors[chan]->n_iio_chan) {
+			if (sensor.type != LTC2983_SENSOR_SENSE_RESISTOR)
+				st->sensors[chan]->n_iio_chan = 1;
+		}
+		st->iio_channels += st->sensors[chan]->n_iio_chan;
+
+		channel_avail_mask |= BIT(sensor.chan);
+		chan++;
+	}
+
+	return 0;
+}
+
+static int ltc2983_eeprom_cmd(struct ltc2983_data *st, unsigned int cmd,
+			      unsigned int wait_time, unsigned int status_reg,
+			      unsigned long status_fail_mask)
+{
+	struct device *dev = &st->spi->dev;
+	unsigned long time;
+	unsigned int val;
+	int ret;
+
+	ret = regmap_bulk_write(st->regmap, LTC2983_EEPROM_KEY_REG,
+				&st->eeprom_key, sizeof(st->eeprom_key));
+	if (ret)
+		return ret;
+
+	reinit_completion(&st->completion);
+
+	ret = regmap_write(st->regmap, LTC2983_STATUS_REG,
+			   LTC2983_STATUS_START(true) | cmd);
+	if (ret)
+		return ret;
+
+	time = wait_for_completion_timeout(&st->completion,
+					   msecs_to_jiffies(wait_time));
+	if (!time)
+		return dev_err_probe(dev, -ETIMEDOUT,
+				     "EEPROM command timed out\n");
+
+	ret = regmap_read(st->regmap, status_reg, &val);
+	if (ret)
+		return ret;
+
+	if (val & status_fail_mask)
+		return dev_err_probe(dev, -EINVAL,
+				     "EEPROM command failed: 0x%02X\n", val);
+
+	return 0;
+}
+
+static int ltc2983_setup(struct ltc2983_data *st, bool assign_iio)
+{
+	struct device *dev = &st->spi->dev;
+	u32 iio_chan_t = 0, iio_chan_v = 0, iio_chan_r = 0, iio_chan_c = 0;
+	u32 chan, iio_idx = 0, status;
+	int ret;
+
+	/* make sure the device is up: start bit (7) is 0 and done bit (6) is 1 */
+	ret = regmap_read_poll_timeout(st->regmap, LTC2983_STATUS_REG, status,
+				       LTC2983_STATUS_UP(status) == 1, 25000,
+				       25000 * 10);
+	if (ret)
+		return dev_err_probe(dev, ret, "Device startup timed out\n");
+
+	ret = regmap_update_bits(st->regmap, LTC2983_GLOBAL_CONFIG_REG,
+				 LTC2983_NOTCH_FREQ_MASK,
+				 LTC2983_NOTCH_FREQ(st->filter_notch_freq));
+	if (ret)
+		return ret;
+
+	ret = regmap_write(st->regmap, LTC2983_MUX_CONFIG_REG,
+			   st->mux_delay_config);
+	if (ret)
+		return ret;
+
+	if (st->info->has_eeprom && !assign_iio) {
+		ret = ltc2983_eeprom_cmd(st, LTC2983_EEPROM_READ_CMD,
+					 LTC2983_EEPROM_READ_TIME_MS,
+					 LTC2983_EEPROM_READ_STATUS_REG,
+					 LTC2983_EEPROM_READ_FAILURE_MASK);
+		if (!ret)
+			return 0;
+	}
+
+	for (chan = 0; chan < st->num_channels; chan++) {
+		u32 chan_type = 0, *iio_chan;
+
+		ret = st->sensors[chan]->assign_chan(st, st->sensors[chan]);
+		if (ret)
+			return ret;
+		/*
+		 * The assign_iio flag is necessary for when the device is
+		 * coming out of sleep. In that case, we just need to
+		 * re-configure the device channels.
+		 * We also don't assign iio channels for rsense.
+		 */
+		if (st->sensors[chan]->type == LTC2983_SENSOR_SENSE_RESISTOR ||
+		    !assign_iio)
+			continue;
+
+		/* assign iio channel */
+		switch (st->sensors[chan]->type) {
+		case LTC2983_SENSOR_COPPER_TRACE:
+			if (st->sensors[chan]->n_iio_chan == 1) {
+				/* sub-ohm copper traces produce only a resistance result */
+				st->iio_chan[iio_idx++] =
+					LTC2983_CHAN(IIO_RESISTANCE, iio_chan_r++, chan);
+			} else {
+				st->iio_chan[iio_idx++] =
+					LTC2983_CHAN(IIO_TEMP, iio_chan_t++, chan);
+				st->iio_chan[iio_idx++] =
+					LTC2983_CHAN(IIO_RESISTANCE, iio_chan_r++, chan);
+			}
+			continue;
+		case LTC2983_SENSOR_LEAK_DETECTOR:
+			st->iio_chan[iio_idx++] =
+				LTC2983_CHAN(IIO_COVERAGE, iio_chan_c++, chan);
+			st->iio_chan[iio_idx++] =
+				LTC2983_CHAN(IIO_RESISTANCE, iio_chan_r++, chan);
+			continue;
+		case LTC2983_SENSOR_DIRECT_ADC:
+			chan_type = IIO_VOLTAGE;
+			iio_chan = &iio_chan_v;
+			break;
+		default:
+			chan_type = IIO_TEMP;
+			iio_chan = &iio_chan_t;
+			break;
+		}
+
+		/*
+		 * add chan as the iio .address so that, we can directly
+		 * reference the sensor given the iio_chan_spec
+		 */
+		st->iio_chan[iio_idx++] = LTC2983_CHAN(chan_type, (*iio_chan)++,
+						       chan);
+	}
+
+	return 0;
+}
+
+static const struct regmap_range ltc2983_reg_ranges[] = {
+	regmap_reg_range(LTC2983_STATUS_REG, LTC2983_STATUS_REG),
+	regmap_reg_range(LTC2983_TEMP_RES_START_REG, LTC2983_TEMP_RES_END_REG),
+	regmap_reg_range(ADT7604_RES_RES_START_REG, ADT7604_RES_RES_END_REG),
+	regmap_reg_range(LTC2983_EEPROM_KEY_REG, LTC2983_EEPROM_KEY_REG),
+	regmap_reg_range(LTC2983_EEPROM_READ_STATUS_REG,
+			 LTC2983_EEPROM_READ_STATUS_REG),
+	regmap_reg_range(LTC2983_GLOBAL_CONFIG_REG, LTC2983_GLOBAL_CONFIG_REG),
+	regmap_reg_range(LTC2983_MULT_CHANNEL_START_REG,
+			 LTC2983_MULT_CHANNEL_END_REG),
+	regmap_reg_range(LTC2986_EEPROM_STATUS_REG, LTC2986_EEPROM_STATUS_REG),
+	regmap_reg_range(LTC2983_MUX_CONFIG_REG, LTC2983_MUX_CONFIG_REG),
+	regmap_reg_range(LTC2983_CHAN_ASSIGN_START_REG,
+			 LTC2983_CHAN_ASSIGN_END_REG),
+	regmap_reg_range(LTC2983_CUST_SENS_TBL_START_REG,
+			 LTC2983_CUST_SENS_TBL_END_REG),
+};
+
+static const struct regmap_access_table ltc2983_reg_table = {
+	.yes_ranges = ltc2983_reg_ranges,
+	.n_yes_ranges = ARRAY_SIZE(ltc2983_reg_ranges),
+};
+
+/*
+ *  The reg_bits are actually 12 but the device needs the first *complete*
+ *  byte for the command (R/W).
+ */
+static const struct regmap_config ltc2983_regmap_config = {
+	.reg_bits = 24,
+	.val_bits = 8,
+	.wr_table = &ltc2983_reg_table,
+	.rd_table = &ltc2983_reg_table,
+	.read_flag_mask = GENMASK(1, 0),
+	.write_flag_mask = BIT(1),
+};
+
+static const struct  iio_info ltc2983_iio_info = {
+	.read_raw = ltc2983_read_raw,
+	.debugfs_reg_access = ltc2983_reg_access,
+};
+
+static int ltc2983_probe(struct spi_device *spi)
+{
+	struct device *dev = &spi->dev;
+	struct ltc2983_data *st;
+	struct iio_dev *indio_dev;
+	struct gpio_desc *gpio;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	st = iio_priv(indio_dev);
+
+	st->info = spi_get_device_match_data(spi);
+	if (!st->info)
+		return -ENODEV;
+
+	st->regmap = devm_regmap_init_spi(spi, &ltc2983_regmap_config);
+	if (IS_ERR(st->regmap))
+		return dev_err_probe(dev, PTR_ERR(st->regmap),
+				     "Failed to initialize regmap\n");
+
+	mutex_init(&st->lock);
+	init_completion(&st->completion);
+	st->spi = spi;
+	st->eeprom_key = cpu_to_be32(LTC2983_EEPROM_KEY);
+	spi_set_drvdata(spi, st);
+
+	ret = ltc2983_parse_fw(st);
+	if (ret)
+		return ret;
+
+	ret = devm_regulator_get_enable(dev, "vdd");
+	if (ret)
+		return ret;
+
+	gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(gpio))
+		return PTR_ERR(gpio);
+
+	if (gpio) {
+		/* bring the device out of reset */
+		usleep_range(1000, 1200);
+		gpiod_set_value_cansleep(gpio, 0);
+	}
+
+	st->iio_chan = devm_kzalloc(dev,
+				    st->iio_channels * sizeof(*st->iio_chan),
+				    GFP_KERNEL);
+	if (!st->iio_chan)
+		return -ENOMEM;
+
+	ret = ltc2983_setup(st, true);
+	if (ret)
+		return ret;
+
+	ret = devm_request_irq(dev, spi->irq, ltc2983_irq_handler,
+			       IRQF_TRIGGER_RISING, st->info->name, st);
+	if (ret)
+		return ret;
+
+	if (st->info->has_eeprom) {
+		ret = ltc2983_eeprom_cmd(st, LTC2983_EEPROM_WRITE_CMD,
+					 LTC2983_EEPROM_WRITE_TIME_MS,
+					 LTC2986_EEPROM_STATUS_REG,
+					 LTC2983_EEPROM_STATUS_FAILURE_MASK);
+		if (ret)
+			return ret;
+	}
+
+	indio_dev->name = st->info->name;
+	indio_dev->num_channels = st->iio_channels;
+	indio_dev->channels = st->iio_chan;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->info = &ltc2983_iio_info;
+
+	return devm_iio_device_register(dev, indio_dev);
+}
+
+static int ltc2983_resume(struct device *dev)
+{
+	struct ltc2983_data *st = spi_get_drvdata(to_spi_device(dev));
+	int dummy;
+
+	/* dummy read to bring the device out of sleep */
+	regmap_read(st->regmap, LTC2983_STATUS_REG, &dummy);
+	/* we need to re-assign the channels */
+	return ltc2983_setup(st, false);
+}
+
+static int ltc2983_suspend(struct device *dev)
+{
+	struct ltc2983_data *st = spi_get_drvdata(to_spi_device(dev));
+
+	return regmap_write(st->regmap, LTC2983_STATUS_REG, LTC2983_SLEEP);
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(ltc2983_pm_ops, ltc2983_suspend,
+				ltc2983_resume);
+
+static const struct ltc2983_chip_info adt7604_chip_info_data = {
+	.name = "adt7604",
+	.max_channels_nr = 20,
+	.has_eeprom = true,
+	.supported_sensors = ADT7604_SENSORS,
+};
+
+static const struct ltc2983_chip_info ltc2983_chip_info_data = {
+	.name = "ltc2983",
+	.max_channels_nr = 20,
+	.supported_sensors = LTC2983_COMMON_SENSORS,
+};
+
+static const struct ltc2983_chip_info ltc2984_chip_info_data = {
+	.name = "ltc2984",
+	.max_channels_nr = 20,
+	.has_eeprom = true,
+	.supported_sensors = LTC2983_COMMON_SENSORS,
+};
+
+static const struct ltc2983_chip_info ltc2986_chip_info_data = {
+	.name = "ltc2986",
+	.max_channels_nr = 10,
+	.has_eeprom = true,
+	.supported_sensors = LTC2983_COMMON_SENSORS | BIT_ULL(LTC2983_SENSOR_ACTIVE_TEMP),
+};
+
+static const struct ltc2983_chip_info ltm2985_chip_info_data = {
+	.name = "ltm2985",
+	.max_channels_nr = 10,
+	.has_eeprom = true,
+	.supported_sensors = LTC2983_COMMON_SENSORS | BIT_ULL(LTC2983_SENSOR_ACTIVE_TEMP),
+};
+
+static const struct spi_device_id ltc2983_id_table[] = {
+	{ .name = "adt7604", .driver_data = (kernel_ulong_t)&adt7604_chip_info_data },
+	{ .name = "ltc2983", .driver_data = (kernel_ulong_t)&ltc2983_chip_info_data },
+	{ .name = "ltc2984", .driver_data = (kernel_ulong_t)&ltc2984_chip_info_data },
+	{ .name = "ltc2986", .driver_data = (kernel_ulong_t)&ltc2986_chip_info_data },
+	{ .name = "ltm2985", .driver_data = (kernel_ulong_t)&ltm2985_chip_info_data },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, ltc2983_id_table);
+
+static const struct of_device_id ltc2983_of_match[] = {
+	{ .compatible = "adi,adt7604", .data = &adt7604_chip_info_data },
+	{ .compatible = "adi,ltc2983", .data = &ltc2983_chip_info_data },
+	{ .compatible = "adi,ltc2984", .data = &ltc2984_chip_info_data },
+	{ .compatible = "adi,ltc2986", .data = &ltc2986_chip_info_data },
+	{ .compatible = "adi,ltm2985", .data = &ltm2985_chip_info_data },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ltc2983_of_match);
+
+static struct spi_driver ltc2983_driver = {
+	.driver = {
+		.name = "ltc2983",
+		.of_match_table = ltc2983_of_match,
+		.pm = pm_sleep_ptr(&ltc2983_pm_ops),
+	},
+	.probe = ltc2983_probe,
+	.id_table = ltc2983_id_table,
+};
+
+module_spi_driver(ltc2983_driver);
+
+MODULE_AUTHOR("Nuno Sa <nuno.sa@analog.com>");
+MODULE_DESCRIPTION("Analog Devices LTC2983 SPI Temperature sensors");
+MODULE_LICENSE("GPL");
diff --git a/drivers/iio/temperature/max30208.c b/drivers/iio/temperature/max30208.c
new file mode 100644
index 000000000..6172abc6d
--- /dev/null
+++ b/drivers/iio/temperature/max30208.c
@@ -0,0 +1,251 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/*
+ * Copyright (c) Rajat Khandelwal <rajat.khandelwal@linux.intel.com>
+ *
+ * Maxim MAX30208 digital temperature sensor with 0.1°C accuracy
+ * (7-bit I2C slave address (0x50 - 0x53))
+ */
+
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/iio/iio.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/types.h>
+
+#define MAX30208_STATUS			0x00
+#define MAX30208_STATUS_TEMP_RDY	BIT(0)
+#define MAX30208_INT_ENABLE		0x01
+#define MAX30208_INT_ENABLE_TEMP_RDY	BIT(0)
+
+#define MAX30208_FIFO_OVF_CNTR		0x06
+#define MAX30208_FIFO_DATA_CNTR		0x07
+#define MAX30208_FIFO_DATA		0x08
+
+#define MAX30208_FIFO_CONFIG		0x0a
+#define MAX30208_FIFO_CONFIG_RO		BIT(1)
+
+#define MAX30208_SYSTEM_CTRL		0x0c
+#define MAX30208_SYSTEM_CTRL_RESET	0x01
+
+#define MAX30208_TEMP_SENSOR_SETUP	0x14
+#define MAX30208_TEMP_SENSOR_SETUP_CONV	BIT(0)
+
+struct max30208_data {
+	struct i2c_client *client;
+	struct mutex lock; /* Lock to prevent concurrent reads of temperature readings */
+};
+
+static const struct iio_chan_spec max30208_channels[] = {
+	{
+		.type = IIO_TEMP,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+	},
+};
+
+/**
+ * max30208_request() - Request a reading
+ * @data: Struct comprising member elements of the device
+ *
+ * Requests a reading from the device and waits until the conversion is ready.
+ */
+static int max30208_request(struct max30208_data *data)
+{
+	/*
+	 * Sensor can take up to 500 ms to respond so execute a total of
+	 * 10 retries to give the device sufficient time.
+	 */
+	int retries = 10;
+	u8 regval;
+	int ret;
+
+	ret = i2c_smbus_read_byte_data(data->client, MAX30208_TEMP_SENSOR_SETUP);
+	if (ret < 0)
+		return ret;
+
+	regval = ret | MAX30208_TEMP_SENSOR_SETUP_CONV;
+
+	ret = i2c_smbus_write_byte_data(data->client, MAX30208_TEMP_SENSOR_SETUP, regval);
+	if (ret)
+		return ret;
+
+	while (retries--) {
+		ret = i2c_smbus_read_byte_data(data->client, MAX30208_STATUS);
+		if (ret < 0)
+			return ret;
+
+		if (ret & MAX30208_STATUS_TEMP_RDY)
+			return 0;
+
+		msleep(50);
+	}
+	dev_err(&data->client->dev, "Temperature conversion failed\n");
+
+	return -ETIMEDOUT;
+}
+
+static int max30208_update_temp(struct max30208_data *data)
+{
+	u8 data_count;
+	int ret;
+
+	mutex_lock(&data->lock);
+
+	ret = max30208_request(data);
+	if (ret)
+		goto unlock;
+
+	ret = i2c_smbus_read_byte_data(data->client, MAX30208_FIFO_OVF_CNTR);
+	if (ret < 0)
+		goto unlock;
+	else if (!ret) {
+		ret = i2c_smbus_read_byte_data(data->client, MAX30208_FIFO_DATA_CNTR);
+		if (ret < 0)
+			goto unlock;
+
+		data_count = ret;
+	} else
+		data_count = 1;
+
+	while (data_count) {
+		ret = i2c_smbus_read_word_swapped(data->client, MAX30208_FIFO_DATA);
+		if (ret < 0)
+			goto unlock;
+
+		data_count--;
+	}
+
+unlock:
+	mutex_unlock(&data->lock);
+	return ret;
+}
+
+/**
+ * max30208_config_setup() - Set up FIFO configuration register
+ * @data: Struct comprising member elements of the device
+ *
+ * Sets the rollover bit to '1' to enable overwriting FIFO during overflow.
+ */
+static int max30208_config_setup(struct max30208_data *data)
+{
+	u8 regval;
+	int ret;
+
+	ret = i2c_smbus_read_byte_data(data->client, MAX30208_FIFO_CONFIG);
+	if (ret < 0)
+		return ret;
+
+	regval = ret | MAX30208_FIFO_CONFIG_RO;
+
+	ret = i2c_smbus_write_byte_data(data->client, MAX30208_FIFO_CONFIG, regval);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int max30208_read(struct iio_dev *indio_dev,
+			 struct iio_chan_spec const *chan,
+			 int *val, int *val2, long mask)
+{
+	struct max30208_data *data = iio_priv(indio_dev);
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		ret = max30208_update_temp(data);
+		if (ret < 0)
+			return ret;
+
+		*val = sign_extend32(ret, 15);
+		return IIO_VAL_INT;
+
+	case IIO_CHAN_INFO_SCALE:
+		*val = 5;
+		return IIO_VAL_INT;
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct iio_info max30208_info = {
+	.read_raw = max30208_read,
+};
+
+static int max30208_probe(struct i2c_client *i2c)
+{
+	struct device *dev = &i2c->dev;
+	struct max30208_data *data;
+	struct iio_dev *indio_dev;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	data = iio_priv(indio_dev);
+	data->client = i2c;
+	mutex_init(&data->lock);
+
+	indio_dev->name = "max30208";
+	indio_dev->channels = max30208_channels;
+	indio_dev->num_channels = ARRAY_SIZE(max30208_channels);
+	indio_dev->info = &max30208_info;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+
+	ret = i2c_smbus_write_byte_data(data->client, MAX30208_SYSTEM_CTRL,
+					MAX30208_SYSTEM_CTRL_RESET);
+	if (ret) {
+		dev_err(dev, "Failure in performing reset\n");
+		return ret;
+	}
+
+	msleep(50);
+
+	ret = max30208_config_setup(data);
+	if (ret)
+		return ret;
+
+	ret = devm_iio_device_register(dev, indio_dev);
+	if (ret) {
+		dev_err(dev, "Failed to register IIO device\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct i2c_device_id max30208_id_table[] = {
+	{ .name = "max30208" },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, max30208_id_table);
+
+static const struct acpi_device_id max30208_acpi_match[] = {
+	{ "MAX30208" },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, max30208_acpi_match);
+
+static const struct of_device_id max30208_of_match[] = {
+	{ .compatible = "maxim,max30208" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, max30208_of_match);
+
+static struct i2c_driver max30208_driver = {
+	.driver = {
+		.name = "max30208",
+		.of_match_table = max30208_of_match,
+		.acpi_match_table = max30208_acpi_match,
+	},
+	.probe = max30208_probe,
+	.id_table = max30208_id_table,
+};
+module_i2c_driver(max30208_driver);
+
+MODULE_AUTHOR("Rajat Khandelwal <rajat.khandelwal@linux.intel.com>");
+MODULE_DESCRIPTION("Maxim MAX30208 digital temperature sensor");
+MODULE_LICENSE("GPL");
diff --git a/drivers/iio/temperature/max31856.c b/drivers/iio/temperature/max31856.c
new file mode 100644
index 000000000..061f6fe6d
--- /dev/null
+++ b/drivers/iio/temperature/max31856.c
@@ -0,0 +1,488 @@
+// SPDX-License-Identifier: GPL-2.0
+/* max31856.c
+ *
+ * Maxim MAX31856 thermocouple sensor driver
+ *
+ * Copyright (C) 2018-2019 Rockwell Collins
+ */
+
+#include <linux/ctype.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/property.h>
+#include <linux/spi/spi.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/util_macros.h>
+#include <linux/unaligned.h>
+#include <dt-bindings/iio/temperature/thermocouple.h>
+/*
+ * The MSB of the register value determines whether the following byte will
+ * be written or read. If it is 0, one or more byte reads will follow.
+ */
+#define MAX31856_RD_WR_BIT         BIT(7)
+
+#define MAX31856_CR0_AUTOCONVERT   BIT(7)
+#define MAX31856_CR0_1SHOT         BIT(6)
+#define MAX31856_CR0_OCFAULT       BIT(4)
+#define MAX31856_CR0_OCFAULT_MASK  GENMASK(5, 4)
+#define MAX31856_CR0_FILTER_50HZ   BIT(0)
+#define MAX31856_AVERAGING_MASK    GENMASK(6, 4)
+#define MAX31856_AVERAGING_SHIFT   4
+#define MAX31856_TC_TYPE_MASK      GENMASK(3, 0)
+#define MAX31856_FAULT_OVUV        BIT(1)
+#define MAX31856_FAULT_OPEN        BIT(0)
+
+/* The MAX31856 registers */
+#define MAX31856_CR0_REG           0x00
+#define MAX31856_CR1_REG           0x01
+#define MAX31856_MASK_REG          0x02
+#define MAX31856_CJHF_REG          0x03
+#define MAX31856_CJLF_REG          0x04
+#define MAX31856_LTHFTH_REG        0x05
+#define MAX31856_LTHFTL_REG        0x06
+#define MAX31856_LTLFTH_REG        0x07
+#define MAX31856_LTLFTL_REG        0x08
+#define MAX31856_CJTO_REG          0x09
+#define MAX31856_CJTH_REG          0x0A
+#define MAX31856_CJTL_REG          0x0B
+#define MAX31856_LTCBH_REG         0x0C
+#define MAX31856_LTCBM_REG         0x0D
+#define MAX31856_LTCBL_REG         0x0E
+#define MAX31856_SR_REG            0x0F
+
+static const struct iio_chan_spec max31856_channels[] = {
+	{	/* Thermocouple Temperature */
+		.type = IIO_TEMP,
+		.info_mask_separate =
+			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE) |
+			BIT(IIO_CHAN_INFO_THERMOCOUPLE_TYPE),
+		.info_mask_shared_by_type =
+			BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO)
+	},
+	{	/* Cold Junction Temperature */
+		.type = IIO_TEMP,
+		.channel2 = IIO_MOD_TEMP_AMBIENT,
+		.modified = 1,
+		.info_mask_separate =
+			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+		.info_mask_shared_by_type =
+			BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO)
+	},
+};
+
+struct max31856_data {
+	struct spi_device *spi;
+	u32 thermocouple_type;
+	bool filter_50hz;
+	int averaging;
+};
+
+static const char max31856_tc_types[] = {
+	'B', 'E', 'J', 'K', 'N', 'R', 'S', 'T'
+};
+
+static int max31856_read(struct max31856_data *data, u8 reg,
+			 u8 val[], unsigned int read_size)
+{
+	return spi_write_then_read(data->spi, &reg, 1, val, read_size);
+}
+
+static int max31856_write(struct max31856_data *data, u8 reg,
+			  unsigned int val)
+{
+	u8 buf[2];
+
+	buf[0] = reg | (MAX31856_RD_WR_BIT);
+	buf[1] = val;
+
+	return spi_write(data->spi, buf, 2);
+}
+
+static int max31856_init(struct max31856_data *data)
+{
+	int ret;
+	u8 reg_cr0_val, reg_cr1_val;
+
+	/* Start by changing to Off mode before making changes as
+	 * some settings are recommended to be set only when the device
+	 * is off
+	 */
+	ret = max31856_read(data, MAX31856_CR0_REG, &reg_cr0_val, 1);
+	if (ret)
+		return ret;
+
+	reg_cr0_val &= ~MAX31856_CR0_AUTOCONVERT;
+	ret = max31856_write(data, MAX31856_CR0_REG, reg_cr0_val);
+	if (ret)
+		return ret;
+
+	/* Set thermocouple type based on dts property */
+	ret = max31856_read(data, MAX31856_CR1_REG, &reg_cr1_val, 1);
+	if (ret)
+		return ret;
+
+	reg_cr1_val &= ~MAX31856_TC_TYPE_MASK;
+	reg_cr1_val |= data->thermocouple_type;
+
+	reg_cr1_val &= ~MAX31856_AVERAGING_MASK;
+	reg_cr1_val |= data->averaging << MAX31856_AVERAGING_SHIFT;
+
+	ret = max31856_write(data, MAX31856_CR1_REG, reg_cr1_val);
+	if (ret)
+		return ret;
+
+	/*
+	 * Enable Open circuit fault detection
+	 * Read datasheet for more information: Table 4.
+	 * Value 01 means : Enabled (Once every 16 conversions)
+	 */
+	reg_cr0_val &= ~MAX31856_CR0_OCFAULT_MASK;
+	reg_cr0_val |= MAX31856_CR0_OCFAULT;
+
+	/* Set Auto Conversion Mode */
+	reg_cr0_val &= ~MAX31856_CR0_1SHOT;
+	reg_cr0_val |= MAX31856_CR0_AUTOCONVERT;
+
+	if (data->filter_50hz)
+		reg_cr0_val |= MAX31856_CR0_FILTER_50HZ;
+	else
+		reg_cr0_val &= ~MAX31856_CR0_FILTER_50HZ;
+
+	return max31856_write(data, MAX31856_CR0_REG, reg_cr0_val);
+}
+
+static int max31856_thermocouple_read(struct max31856_data *data,
+				      struct iio_chan_spec const *chan,
+				      int *val)
+{
+	int ret, offset_cjto;
+	u8 reg_val[3];
+
+	switch (chan->channel2) {
+	case IIO_NO_MOD:
+		/*
+		 * Multibyte Read
+		 * MAX31856_LTCBH_REG, MAX31856_LTCBM_REG, MAX31856_LTCBL_REG
+		 */
+		ret = max31856_read(data, MAX31856_LTCBH_REG, reg_val, 3);
+		if (ret)
+			return ret;
+		/* Skip last 5 dead bits of LTCBL */
+		*val = get_unaligned_be24(&reg_val[0]) >> 5;
+		/* Check 7th bit of LTCBH reg. value for sign*/
+		if (reg_val[0] & 0x80)
+			*val -= 0x80000;
+		break;
+
+	case IIO_MOD_TEMP_AMBIENT:
+		/*
+		 * Multibyte Read
+		 * MAX31856_CJTO_REG, MAX31856_CJTH_REG, MAX31856_CJTL_REG
+		 */
+		ret = max31856_read(data, MAX31856_CJTO_REG, reg_val, 3);
+		if (ret)
+			return ret;
+		/* Get Cold Junction Temp. offset register value */
+		offset_cjto = reg_val[0];
+		/* Get CJTH and CJTL value and skip last 2 dead bits of CJTL */
+		*val = get_unaligned_be16(&reg_val[1]) >> 2;
+		/* As per datasheet add offset into CJTH and CJTL */
+		*val += offset_cjto;
+		/* Check 7th bit of CJTH reg. value for sign */
+		if (reg_val[1] & 0x80)
+			*val -= 0x4000;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	ret = max31856_read(data, MAX31856_SR_REG, reg_val, 1);
+	if (ret)
+		return ret;
+	/* Check for over/under voltage or open circuit fault */
+	if (reg_val[0] & (MAX31856_FAULT_OVUV | MAX31856_FAULT_OPEN))
+		return -EIO;
+
+	return ret;
+}
+
+static int max31856_read_raw(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *chan,
+			     int *val, int *val2, long mask)
+{
+	struct max31856_data *data = iio_priv(indio_dev);
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		ret = max31856_thermocouple_read(data, chan, val);
+		if (ret)
+			return ret;
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SCALE:
+		switch (chan->channel2) {
+		case IIO_MOD_TEMP_AMBIENT:
+			/* Cold junction Temp. Data resolution is 0.015625 */
+			*val = 15;
+			*val2 = 625000; /* 1000 * 0.015625 */
+			ret = IIO_VAL_INT_PLUS_MICRO;
+			break;
+		default:
+			/* Thermocouple Temp. Data resolution is 0.0078125 */
+			*val = 7;
+			*val2 = 812500; /* 1000 * 0.0078125) */
+			return IIO_VAL_INT_PLUS_MICRO;
+		}
+		break;
+	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+		*val = 1 << data->averaging;
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_THERMOCOUPLE_TYPE:
+		*val = max31856_tc_types[data->thermocouple_type];
+		return IIO_VAL_CHAR;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	return ret;
+}
+
+static int max31856_write_raw_get_fmt(struct iio_dev *indio_dev,
+				      struct iio_chan_spec const *chan,
+				      long mask)
+{
+	switch (mask) {
+	case IIO_CHAN_INFO_THERMOCOUPLE_TYPE:
+		return IIO_VAL_CHAR;
+	default:
+		return IIO_VAL_INT;
+	}
+}
+
+static int max31856_write_raw(struct iio_dev *indio_dev,
+			      struct iio_chan_spec const *chan,
+			      int val, int val2, long mask)
+{
+	struct max31856_data *data = iio_priv(indio_dev);
+	int msb;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+		if (val > 16 || val < 1)
+			return -EINVAL;
+		msb = fls(val) - 1;
+		/* Round up to next 2pow if needed */
+		if (BIT(msb) < val)
+			msb++;
+
+		data->averaging = msb;
+		max31856_init(data);
+		break;
+	case IIO_CHAN_INFO_THERMOCOUPLE_TYPE:
+	{
+		int tc_type = -1;
+		int i;
+
+		for (i = 0; i < ARRAY_SIZE(max31856_tc_types); i++) {
+			if (max31856_tc_types[i] == toupper(val)) {
+				tc_type = i;
+				break;
+			}
+		}
+		if (tc_type < 0)
+			return -EINVAL;
+
+		data->thermocouple_type = tc_type;
+		max31856_init(data);
+		break;
+	}
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static ssize_t show_fault(struct device *dev, u8 faultbit, char *buf)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct max31856_data *data = iio_priv(indio_dev);
+	u8 reg_val;
+	int ret;
+	bool fault;
+
+	ret = max31856_read(data, MAX31856_SR_REG, &reg_val, 1);
+	if (ret)
+		return ret;
+
+	fault = reg_val & faultbit;
+
+	return sysfs_emit(buf, "%d\n", fault);
+}
+
+static ssize_t show_fault_ovuv(struct device *dev,
+			       struct device_attribute *attr,
+			       char *buf)
+{
+	return show_fault(dev, MAX31856_FAULT_OVUV, buf);
+}
+
+static ssize_t show_fault_oc(struct device *dev,
+			     struct device_attribute *attr,
+			     char *buf)
+{
+	return show_fault(dev, MAX31856_FAULT_OPEN, buf);
+}
+
+static ssize_t show_filter(struct device *dev,
+			   struct device_attribute *attr,
+			   char *buf)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct max31856_data *data = iio_priv(indio_dev);
+
+	return sysfs_emit(buf, "%d\n", data->filter_50hz ? 50 : 60);
+}
+
+static ssize_t set_filter(struct device *dev,
+			  struct device_attribute *attr,
+			  const char *buf,
+			  size_t len)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct max31856_data *data = iio_priv(indio_dev);
+	unsigned int freq;
+	int ret;
+
+	ret = kstrtouint(buf, 10, &freq);
+	if (ret)
+		return ret;
+
+	switch (freq) {
+	case 50:
+		data->filter_50hz = true;
+		break;
+	case 60:
+		data->filter_50hz = false;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	max31856_init(data);
+	return len;
+}
+
+static IIO_DEVICE_ATTR(fault_ovuv, 0444, show_fault_ovuv, NULL, 0);
+static IIO_DEVICE_ATTR(fault_oc, 0444, show_fault_oc, NULL, 0);
+static IIO_DEVICE_ATTR(in_temp_filter_notch_center_frequency, 0644,
+		       show_filter, set_filter, 0);
+
+static struct attribute *max31856_attributes[] = {
+	&iio_dev_attr_fault_ovuv.dev_attr.attr,
+	&iio_dev_attr_fault_oc.dev_attr.attr,
+	&iio_dev_attr_in_temp_filter_notch_center_frequency.dev_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group max31856_group = {
+	.attrs = max31856_attributes,
+};
+
+static const struct iio_info max31856_info = {
+	.read_raw = max31856_read_raw,
+	.write_raw = max31856_write_raw,
+	.write_raw_get_fmt = max31856_write_raw_get_fmt,
+	.attrs = &max31856_group,
+};
+
+static int max31856_probe(struct spi_device *spi)
+{
+	const struct spi_device_id *id = spi_get_device_id(spi);
+	struct iio_dev *indio_dev;
+	struct max31856_data *data;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	data = iio_priv(indio_dev);
+	data->spi = spi;
+	data->filter_50hz = false;
+
+	spi_set_drvdata(spi, indio_dev);
+
+	indio_dev->info = &max31856_info;
+	indio_dev->name = id->name;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = max31856_channels;
+	indio_dev->num_channels = ARRAY_SIZE(max31856_channels);
+
+	ret = device_property_read_u32(&spi->dev, "thermocouple-type", &data->thermocouple_type);
+	if (ret) {
+		dev_info(&spi->dev,
+			 "Could not read thermocouple type DT property, configuring as a K-Type\n");
+		data->thermocouple_type = THERMOCOUPLE_TYPE_K;
+	}
+
+	/*
+	 * no need to translate values as the supported types
+	 * have the same value as the #defines
+	 */
+	switch (data->thermocouple_type) {
+	case THERMOCOUPLE_TYPE_B:
+	case THERMOCOUPLE_TYPE_E:
+	case THERMOCOUPLE_TYPE_J:
+	case THERMOCOUPLE_TYPE_K:
+	case THERMOCOUPLE_TYPE_N:
+	case THERMOCOUPLE_TYPE_R:
+	case THERMOCOUPLE_TYPE_S:
+	case THERMOCOUPLE_TYPE_T:
+		break;
+	default:
+		dev_err(&spi->dev,
+			"error: thermocouple-type %u not supported by max31856\n"
+			, data->thermocouple_type);
+		return -EINVAL;
+	}
+
+	ret = max31856_init(data);
+	if (ret) {
+		dev_err(&spi->dev, "error: Failed to configure max31856\n");
+		return ret;
+	}
+
+	return devm_iio_device_register(&spi->dev, indio_dev);
+}
+
+static const struct spi_device_id max31856_id[] = {
+	{ .name = "max31856" },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, max31856_id);
+
+static const struct of_device_id max31856_of_match[] = {
+	{ .compatible = "maxim,max31856" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, max31856_of_match);
+
+static struct spi_driver max31856_driver = {
+	.driver = {
+		.name = "max31856",
+		.of_match_table = max31856_of_match,
+	},
+	.probe = max31856_probe,
+	.id_table = max31856_id,
+};
+module_spi_driver(max31856_driver);
+
+MODULE_AUTHOR("Paresh Chaudhary <paresh.chaudhary@rockwellcollins.com>");
+MODULE_AUTHOR("Patrick Havelange <patrick.havelange@essensium.com>");
+MODULE_DESCRIPTION("Maxim MAX31856 thermocouple sensor driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/iio/temperature/max31865.c b/drivers/iio/temperature/max31865.c
new file mode 100644
index 000000000..f9c93f95d
--- /dev/null
+++ b/drivers/iio/temperature/max31865.c
@@ -0,0 +1,350 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/*
+ * Copyright (c) Linumiz 2021
+ *
+ * max31865.c - Maxim MAX31865 RTD-to-Digital Converter sensor driver
+ *
+ * Author: Navin Sankar Velliangiri <navin@linumiz.com>
+ */
+
+#include <linux/ctype.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/property.h>
+#include <linux/spi/spi.h>
+#include <linux/unaligned.h>
+
+/*
+ * The MSB of the register value determines whether the following byte will
+ * be written or read. If it is 0, read will follow and if it is 1, write
+ * will follow.
+ */
+#define MAX31865_RD_WR_BIT			BIT(7)
+
+#define MAX31865_CFG_VBIAS			BIT(7)
+#define MAX31865_CFG_1SHOT			BIT(5)
+#define MAX31865_3WIRE_RTD			BIT(4)
+#define MAX31865_FAULT_STATUS_CLEAR		BIT(1)
+#define MAX31865_FILTER_50HZ			BIT(0)
+
+/* The MAX31865 registers */
+#define MAX31865_CFG_REG			0x00
+#define MAX31865_RTD_MSB			0x01
+#define MAX31865_FAULT_STATUS			0x07
+
+#define MAX31865_FAULT_OVUV			BIT(2)
+
+static const char max31865_show_samp_freq[] = "50 60";
+
+static const struct iio_chan_spec max31865_channels[] = {
+	{	/* RTD Temperature */
+		.type = IIO_TEMP,
+		.info_mask_separate =
+			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE)
+	},
+};
+
+struct max31865_data {
+	struct spi_device *spi;
+	struct mutex lock;
+	bool filter_50hz;
+	bool three_wire;
+	u8 buf[2] __aligned(IIO_DMA_MINALIGN);
+};
+
+static int max31865_read(struct max31865_data *data, u8 reg,
+			 unsigned int read_size)
+{
+	return spi_write_then_read(data->spi, &reg, 1, data->buf, read_size);
+}
+
+static int max31865_write(struct max31865_data *data, size_t len)
+{
+	return spi_write(data->spi, data->buf, len);
+}
+
+static int enable_bias(struct max31865_data *data)
+{
+	u8 cfg;
+	int ret;
+
+	ret = max31865_read(data, MAX31865_CFG_REG, 1);
+	if (ret)
+		return ret;
+
+	cfg = data->buf[0];
+
+	data->buf[0] = MAX31865_CFG_REG | MAX31865_RD_WR_BIT;
+	data->buf[1] = cfg | MAX31865_CFG_VBIAS;
+
+	return max31865_write(data, 2);
+}
+
+static int disable_bias(struct max31865_data *data)
+{
+	u8 cfg;
+	int ret;
+
+	ret = max31865_read(data, MAX31865_CFG_REG, 1);
+	if (ret)
+		return ret;
+
+	cfg = data->buf[0];
+	cfg &= ~MAX31865_CFG_VBIAS;
+
+	data->buf[0] = MAX31865_CFG_REG | MAX31865_RD_WR_BIT;
+	data->buf[1] = cfg;
+
+	return max31865_write(data, 2);
+}
+
+static int max31865_rtd_read(struct max31865_data *data, int *val)
+{
+	u8 reg;
+	int ret;
+
+	/* Enable BIAS to start the conversion */
+	ret = enable_bias(data);
+	if (ret)
+		return ret;
+
+	/* wait 10.5ms before initiating the conversion */
+	msleep(11);
+
+	ret = max31865_read(data, MAX31865_CFG_REG, 1);
+	if (ret)
+		return ret;
+
+	reg = data->buf[0];
+	reg |= MAX31865_CFG_1SHOT | MAX31865_FAULT_STATUS_CLEAR;
+	data->buf[0] = MAX31865_CFG_REG | MAX31865_RD_WR_BIT;
+	data->buf[1] = reg;
+
+	ret = max31865_write(data, 2);
+	if (ret)
+		return ret;
+
+	if (data->filter_50hz) {
+		/* 50Hz filter mode requires 62.5ms to complete */
+		msleep(63);
+	} else {
+		/* 60Hz filter mode requires 52ms to complete */
+		msleep(52);
+	}
+
+	ret = max31865_read(data, MAX31865_RTD_MSB, 2);
+	if (ret)
+		return ret;
+
+	*val = get_unaligned_be16(&data->buf) >> 1;
+
+	return disable_bias(data);
+}
+
+static int max31865_read_raw(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *chan,
+			     int *val, int *val2, long mask)
+{
+	struct max31865_data *data = iio_priv(indio_dev);
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		mutex_lock(&data->lock);
+		ret = max31865_rtd_read(data, val);
+		mutex_unlock(&data->lock);
+		if (ret)
+			return ret;
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SCALE:
+		/* Temp. Data resolution is 0.03125 degree centigrade */
+		*val = 31;
+		*val2 = 250000; /* 1000 * 0.03125 */
+		return IIO_VAL_INT_PLUS_MICRO;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int max31865_init(struct max31865_data *data)
+{
+	u8 cfg;
+	int ret;
+
+	ret = max31865_read(data, MAX31865_CFG_REG, 1);
+	if (ret)
+		return ret;
+
+	cfg = data->buf[0];
+
+	if (data->three_wire)
+		/* 3-wire RTD connection */
+		cfg |= MAX31865_3WIRE_RTD;
+
+	if (data->filter_50hz)
+		/* 50Hz noise rejection filter */
+		cfg |= MAX31865_FILTER_50HZ;
+
+	data->buf[0] = MAX31865_CFG_REG | MAX31865_RD_WR_BIT;
+	data->buf[1] = cfg;
+
+	return max31865_write(data, 2);
+}
+
+static ssize_t show_fault(struct device *dev, u8 faultbit, char *buf)
+{
+	int ret;
+	bool fault;
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct max31865_data *data = iio_priv(indio_dev);
+
+	ret = max31865_read(data, MAX31865_FAULT_STATUS, 1);
+	if (ret)
+		return ret;
+
+	fault = data->buf[0] & faultbit;
+
+	return sysfs_emit(buf, "%d\n", fault);
+}
+
+static ssize_t show_fault_ovuv(struct device *dev,
+			      struct device_attribute *attr,
+			      char *buf)
+{
+	return show_fault(dev, MAX31865_FAULT_OVUV, buf);
+}
+
+static ssize_t show_filter(struct device *dev,
+			   struct device_attribute *attr,
+			   char *buf)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct max31865_data *data = iio_priv(indio_dev);
+
+	return sysfs_emit(buf, "%d\n", data->filter_50hz ? 50 : 60);
+}
+
+static ssize_t set_filter(struct device *dev,
+			  struct device_attribute *attr,
+			  const char *buf,
+			  size_t len)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct max31865_data *data = iio_priv(indio_dev);
+	unsigned int freq;
+	int ret;
+
+	ret = kstrtouint(buf, 10, &freq);
+	if (ret)
+		return ret;
+
+	switch (freq) {
+	case 50:
+		data->filter_50hz = true;
+		break;
+	case 60:
+		data->filter_50hz = false;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	mutex_lock(&data->lock);
+	ret = max31865_init(data);
+	mutex_unlock(&data->lock);
+	if (ret)
+		return ret;
+
+	return len;
+}
+
+static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(max31865_show_samp_freq);
+static IIO_DEVICE_ATTR(fault_ovuv, 0444, show_fault_ovuv, NULL, 0);
+static IIO_DEVICE_ATTR(in_filter_notch_center_frequency, 0644,
+		    show_filter, set_filter, 0);
+
+static struct attribute *max31865_attributes[] = {
+	&iio_dev_attr_fault_ovuv.dev_attr.attr,
+	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
+	&iio_dev_attr_in_filter_notch_center_frequency.dev_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group max31865_group = {
+	.attrs = max31865_attributes,
+};
+
+static const struct iio_info max31865_info = {
+	.read_raw = max31865_read_raw,
+	.attrs = &max31865_group,
+};
+
+static int max31865_probe(struct spi_device *spi)
+{
+	const struct spi_device_id *id = spi_get_device_id(spi);
+	struct iio_dev *indio_dev;
+	struct max31865_data *data;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	data = iio_priv(indio_dev);
+	data->spi = spi;
+	data->filter_50hz = false;
+	mutex_init(&data->lock);
+
+	indio_dev->info = &max31865_info;
+	indio_dev->name = id->name;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = max31865_channels;
+	indio_dev->num_channels = ARRAY_SIZE(max31865_channels);
+
+	if (device_property_read_bool(&spi->dev, "maxim,3-wire")) {
+		/* select 3 wire */
+		data->three_wire = 1;
+	} else {
+		/* select 2 or 4 wire */
+		data->three_wire = 0;
+	}
+
+	ret = max31865_init(data);
+	if (ret) {
+		dev_err(&spi->dev, "error: Failed to configure max31865\n");
+		return ret;
+	}
+
+	return devm_iio_device_register(&spi->dev, indio_dev);
+}
+
+static const struct spi_device_id max31865_id[] = {
+	{ .name = "max31865" },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, max31865_id);
+
+static const struct of_device_id max31865_of_match[] = {
+	{ .compatible = "maxim,max31865" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, max31865_of_match);
+
+static struct spi_driver max31865_driver = {
+	.driver = {
+		.name	= "max31865",
+		.of_match_table = max31865_of_match,
+	},
+	.probe = max31865_probe,
+	.id_table = max31865_id,
+};
+module_spi_driver(max31865_driver);
+
+MODULE_AUTHOR("Navin Sankar Velliangiri <navin@linumiz.com>");
+MODULE_DESCRIPTION("Maxim MAX31865 RTD-to-Digital Converter sensor driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/temperature/maxim_thermocouple.c b/drivers/iio/temperature/maxim_thermocouple.c
new file mode 100644
index 000000000..5f216e238
--- /dev/null
+++ b/drivers/iio/temperature/maxim_thermocouple.c
@@ -0,0 +1,304 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * maxim_thermocouple.c  - Support for Maxim thermocouple chips
+ *
+ * Copyright (C) 2016-2018 Matt Ranostay
+ * Author: <matt.ranostay@konsulko.com>
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/spi/spi.h>
+#include <linux/types.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/trigger_consumer.h>
+
+#define MAXIM_THERMOCOUPLE_DRV_NAME	"maxim_thermocouple"
+
+enum {
+	MAX6675,
+	MAX31855,
+	MAX31855K,
+	MAX31855J,
+	MAX31855N,
+	MAX31855S,
+	MAX31855T,
+	MAX31855E,
+	MAX31855R,
+};
+
+static const char maxim_tc_types[] = {
+	'K', '?', 'K', 'J', 'N', 'S', 'T', 'E', 'R'
+};
+
+static const struct iio_chan_spec max6675_channels[] = {
+	{	/* thermocouple temperature */
+		.type = IIO_TEMP,
+		.info_mask_separate =
+			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE) |
+			BIT(IIO_CHAN_INFO_THERMOCOUPLE_TYPE),
+		.scan_index = 0,
+		.scan_type = {
+			.sign = 's',
+			.realbits = 13,
+			.storagebits = 16,
+			.shift = 3,
+			.endianness = IIO_BE,
+		},
+	},
+	IIO_CHAN_SOFT_TIMESTAMP(1),
+};
+
+static const struct iio_chan_spec max31855_channels[] = {
+	{	/* thermocouple temperature */
+		.type = IIO_TEMP,
+		.address = 2,
+		.info_mask_separate =
+			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE) |
+			BIT(IIO_CHAN_INFO_THERMOCOUPLE_TYPE),
+		.scan_index = 0,
+		.scan_type = {
+			.sign = 's',
+			.realbits = 14,
+			.storagebits = 16,
+			.shift = 2,
+			.endianness = IIO_BE,
+		},
+	},
+	{	/* cold junction temperature */
+		.type = IIO_TEMP,
+		.address = 0,
+		.channel2 = IIO_MOD_TEMP_AMBIENT,
+		.modified = 1,
+		.info_mask_separate =
+			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+		.scan_index = 1,
+		.scan_type = {
+			.sign = 's',
+			.realbits = 12,
+			.storagebits = 16,
+			.shift = 4,
+			.endianness = IIO_BE,
+		},
+	},
+	IIO_CHAN_SOFT_TIMESTAMP(2),
+};
+
+static const unsigned long max31855_scan_masks[] = {0x3, 0};
+
+struct maxim_thermocouple_chip {
+	const struct iio_chan_spec *channels;
+	const unsigned long *scan_masks;
+	u8 num_channels;
+	u8 read_size;
+
+	/* bit-check for valid input */
+	u32 status_bit;
+};
+
+static const struct maxim_thermocouple_chip maxim_thermocouple_chips[] = {
+	[MAX6675] = {
+			.channels = max6675_channels,
+			.num_channels = ARRAY_SIZE(max6675_channels),
+			.read_size = 2,
+			.status_bit = BIT(2),
+		},
+	[MAX31855] = {
+			.channels = max31855_channels,
+			.num_channels = ARRAY_SIZE(max31855_channels),
+			.read_size = 4,
+			.scan_masks = max31855_scan_masks,
+			.status_bit = BIT(16),
+		},
+};
+
+struct maxim_thermocouple_data {
+	struct spi_device *spi;
+	const struct maxim_thermocouple_chip *chip;
+	char tc_type;
+	/* Buffer for reading up to 2 hardware channels. */
+	struct {
+		union {
+			__be16 raw16;
+			__be32 raw32;
+			__be16 raw[2];
+		};
+		aligned_s64 timestamp;
+	} buffer __aligned(IIO_DMA_MINALIGN);
+};
+
+static int maxim_thermocouple_read(struct maxim_thermocouple_data *data,
+				   struct iio_chan_spec const *chan, int *val)
+{
+	unsigned int storage_bytes = data->chip->read_size;
+	unsigned int shift = chan->scan_type.shift + (chan->address * 8);
+	int ret;
+
+	switch (storage_bytes) {
+	case 2:
+		ret = spi_read(data->spi, &data->buffer.raw16, storage_bytes);
+		*val = be16_to_cpu(data->buffer.raw16);
+		break;
+	case 4:
+		ret = spi_read(data->spi, &data->buffer.raw32, storage_bytes);
+		*val = be32_to_cpu(data->buffer.raw32);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	if (ret)
+		return ret;
+
+	/* check to be sure this is a valid reading */
+	if (*val & data->chip->status_bit)
+		return -EINVAL;
+
+	*val = sign_extend32(*val >> shift, chan->scan_type.realbits - 1);
+
+	return 0;
+}
+
+static irqreturn_t maxim_thermocouple_trigger_handler(int irq, void *private)
+{
+	struct iio_poll_func *pf = private;
+	struct iio_dev *indio_dev = pf->indio_dev;
+	struct maxim_thermocouple_data *data = iio_priv(indio_dev);
+	int ret;
+
+	ret = spi_read(data->spi, data->buffer.raw, data->chip->read_size);
+	if (!ret) {
+		iio_push_to_buffers_with_ts(indio_dev, &data->buffer,
+					    sizeof(data->buffer),
+					    iio_get_time_ns(indio_dev));
+	}
+
+	iio_trigger_notify_done(indio_dev->trig);
+
+	return IRQ_HANDLED;
+}
+
+static int maxim_thermocouple_read_raw(struct iio_dev *indio_dev,
+				       struct iio_chan_spec const *chan,
+				       int *val, int *val2, long mask)
+{
+	struct maxim_thermocouple_data *data = iio_priv(indio_dev);
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		if (!iio_device_claim_direct(indio_dev))
+			return -EBUSY;
+
+		ret = maxim_thermocouple_read(data, chan, val);
+		iio_device_release_direct(indio_dev);
+		if (ret)
+			return ret;
+
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SCALE:
+		switch (chan->channel2) {
+		case IIO_MOD_TEMP_AMBIENT:
+			*val = 62;
+			*val2 = 500000; /* 1000 * 0.0625 */
+			return IIO_VAL_INT_PLUS_MICRO;
+		default:
+			*val = 250; /* 1000 * 0.25 */
+			return IIO_VAL_INT;
+		}
+	case IIO_CHAN_INFO_THERMOCOUPLE_TYPE:
+		*val = data->tc_type;
+		return IIO_VAL_CHAR;
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct iio_info maxim_thermocouple_info = {
+	.read_raw = maxim_thermocouple_read_raw,
+};
+
+static int maxim_thermocouple_probe(struct spi_device *spi)
+{
+	const struct spi_device_id *id = spi_get_device_id(spi);
+	struct iio_dev *indio_dev;
+	struct maxim_thermocouple_data *data;
+	const int chip_type = (id->driver_data == MAX6675) ? MAX6675 : MAX31855;
+	const struct maxim_thermocouple_chip *chip =
+		&maxim_thermocouple_chips[chip_type];
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	indio_dev->info = &maxim_thermocouple_info;
+	indio_dev->name = MAXIM_THERMOCOUPLE_DRV_NAME;
+	indio_dev->channels = chip->channels;
+	indio_dev->available_scan_masks = chip->scan_masks;
+	indio_dev->num_channels = chip->num_channels;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+
+	data = iio_priv(indio_dev);
+	data->spi = spi;
+	data->chip = chip;
+	data->tc_type = maxim_tc_types[id->driver_data];
+
+	ret = devm_iio_triggered_buffer_setup(&spi->dev,
+				indio_dev, NULL,
+				maxim_thermocouple_trigger_handler, NULL);
+	if (ret)
+		return ret;
+
+	if (id->driver_data == MAX31855)
+		dev_warn(&spi->dev, "generic max31855 ID is deprecated\nplease use more specific part type");
+
+	return devm_iio_device_register(&spi->dev, indio_dev);
+}
+
+static const struct spi_device_id maxim_thermocouple_id[] = {
+	{ .name = "max6675", .driver_data = MAX6675 },
+	{ .name = "max31855", .driver_data = MAX31855 },
+	{ .name = "max31855k", .driver_data = MAX31855K },
+	{ .name = "max31855j", .driver_data = MAX31855J },
+	{ .name = "max31855n", .driver_data = MAX31855N },
+	{ .name = "max31855s", .driver_data = MAX31855S },
+	{ .name = "max31855t", .driver_data = MAX31855T },
+	{ .name = "max31855e", .driver_data = MAX31855E },
+	{ .name = "max31855r", .driver_data = MAX31855R },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, maxim_thermocouple_id);
+
+static const struct of_device_id maxim_thermocouple_of_match[] = {
+	{ .compatible = "maxim,max6675" },
+	{ .compatible = "maxim,max31855" },
+	{ .compatible = "maxim,max31855k" },
+	{ .compatible = "maxim,max31855j" },
+	{ .compatible = "maxim,max31855n" },
+	{ .compatible = "maxim,max31855s" },
+	{ .compatible = "maxim,max31855t" },
+	{ .compatible = "maxim,max31855e" },
+	{ .compatible = "maxim,max31855r" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, maxim_thermocouple_of_match);
+
+static struct spi_driver maxim_thermocouple_driver = {
+	.driver = {
+		.name	= MAXIM_THERMOCOUPLE_DRV_NAME,
+		.of_match_table = maxim_thermocouple_of_match,
+	},
+	.probe		= maxim_thermocouple_probe,
+	.id_table	= maxim_thermocouple_id,
+};
+module_spi_driver(maxim_thermocouple_driver);
+
+MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>");
+MODULE_DESCRIPTION("Maxim thermocouple sensors");
+MODULE_LICENSE("GPL");
diff --git a/drivers/iio/temperature/mcp9600.c b/drivers/iio/temperature/mcp9600.c
new file mode 100644
index 000000000..b0ff0c7b4
--- /dev/null
+++ b/drivers/iio/temperature/mcp9600.c
@@ -0,0 +1,579 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * mcp9600.c - Support for Microchip MCP9600 thermocouple EMF converter
+ *
+ * Copyright (c) 2022 Andrew Hepp
+ * Author: <andrew.hepp@ahepp.dev>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bitops.h>
+#include <linux/bits.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/math.h>
+#include <linux/minmax.h>
+#include <linux/module.h>
+
+#include <linux/iio/events.h>
+#include <linux/iio/iio.h>
+
+#include <dt-bindings/iio/temperature/thermocouple.h>
+
+/* MCP9600 registers */
+#define MCP9600_HOT_JUNCTION		0x00
+#define MCP9600_COLD_JUNCTION		0x02
+#define MCP9600_STATUS			0x04
+#define MCP9600_STATUS_ALERT(x)		BIT(x)
+#define MCP9600_SENSOR_CFG		0x05
+#define MCP9600_SENSOR_TYPE_MASK	GENMASK(6, 4)
+#define MCP9600_ALERT_CFG1		0x08
+#define MCP9600_ALERT_CFG(x)		(MCP9600_ALERT_CFG1 + (x - 1))
+#define MCP9600_ALERT_CFG_ENABLE	BIT(0)
+#define MCP9600_ALERT_CFG_ACTIVE_HIGH	BIT(2)
+#define MCP9600_ALERT_CFG_FALLING	BIT(3)
+#define MCP9600_ALERT_CFG_COLD_JUNCTION	BIT(4)
+#define MCP9600_ALERT_HYSTERESIS1	0x0c
+#define MCP9600_ALERT_HYSTERESIS(x)	(MCP9600_ALERT_HYSTERESIS1 + (x - 1))
+#define MCP9600_ALERT_LIMIT1		0x10
+#define MCP9600_ALERT_LIMIT(x)		(MCP9600_ALERT_LIMIT1 + (x - 1))
+#define MCP9600_ALERT_LIMIT_MASK	GENMASK(15, 2)
+#define MCP9600_DEVICE_ID		0x20
+
+/* MCP9600 device id value */
+#define MCP9600_DEVICE_ID_MCP9600	0x40
+#define MCP9600_DEVICE_ID_MCP9601	0x41
+
+#define MCP9600_ALERT_COUNT		4
+
+#define MCP9600_MIN_TEMP_HOT_JUNCTION_MICRO	-200000000
+#define MCP9600_MAX_TEMP_HOT_JUNCTION_MICRO	1800000000
+
+#define MCP9600_MIN_TEMP_COLD_JUNCTION_MICRO	-40000000
+#define MCP9600_MAX_TEMP_COLD_JUNCTION_MICRO	125000000
+
+enum mcp9600_alert {
+	MCP9600_ALERT1,
+	MCP9600_ALERT2,
+	MCP9600_ALERT3,
+	MCP9600_ALERT4
+};
+
+static const char * const mcp9600_alert_name[MCP9600_ALERT_COUNT] = {
+	[MCP9600_ALERT1] = "alert1",
+	[MCP9600_ALERT2] = "alert2",
+	[MCP9600_ALERT3] = "alert3",
+	[MCP9600_ALERT4] = "alert4",
+};
+
+/* Map between dt-bindings enum and the chip's type value */
+static const unsigned int mcp9600_type_map[] = {
+	[THERMOCOUPLE_TYPE_K] = 0,
+	[THERMOCOUPLE_TYPE_J] = 1,
+	[THERMOCOUPLE_TYPE_T] = 2,
+	[THERMOCOUPLE_TYPE_N] = 3,
+	[THERMOCOUPLE_TYPE_S] = 4,
+	[THERMOCOUPLE_TYPE_E] = 5,
+	[THERMOCOUPLE_TYPE_B] = 6,
+	[THERMOCOUPLE_TYPE_R] = 7,
+};
+
+/* Map thermocouple type to a char for iio info in sysfs */
+static const int mcp9600_tc_types[] = {
+	[THERMOCOUPLE_TYPE_K] = 'K',
+	[THERMOCOUPLE_TYPE_J] = 'J',
+	[THERMOCOUPLE_TYPE_T] = 'T',
+	[THERMOCOUPLE_TYPE_N] = 'N',
+	[THERMOCOUPLE_TYPE_S] = 'S',
+	[THERMOCOUPLE_TYPE_E] = 'E',
+	[THERMOCOUPLE_TYPE_B] = 'B',
+	[THERMOCOUPLE_TYPE_R] = 'R',
+};
+
+static const struct iio_event_spec mcp9600_events[] = {
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_RISING,
+		.mask_separate = BIT(IIO_EV_INFO_ENABLE) |
+				 BIT(IIO_EV_INFO_VALUE) |
+				 BIT(IIO_EV_INFO_HYSTERESIS),
+	},
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_FALLING,
+		.mask_separate = BIT(IIO_EV_INFO_ENABLE) |
+				 BIT(IIO_EV_INFO_VALUE) |
+				 BIT(IIO_EV_INFO_HYSTERESIS),
+	},
+};
+
+struct mcp_chip_info {
+	u8 chip_id;
+	const char *chip_name;
+};
+
+struct mcp9600_data {
+	struct i2c_client *client;
+	u32 thermocouple_type;
+};
+
+static int mcp9600_config(struct mcp9600_data *data)
+{
+	struct i2c_client *client = data->client;
+	int ret;
+	u8 cfg;
+
+	cfg  = FIELD_PREP(MCP9600_SENSOR_TYPE_MASK,
+			  mcp9600_type_map[data->thermocouple_type]);
+
+	ret = i2c_smbus_write_byte_data(client, MCP9600_SENSOR_CFG, cfg);
+	if (ret < 0) {
+		dev_err(&client->dev, "Failed to set sensor configuration\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+#define MCP9600_CHANNELS(hj_num_ev, hj_ev_spec_off, cj_num_ev, cj_ev_spec_off) \
+	{								       \
+		{							       \
+			.type = IIO_TEMP,				       \
+			.address = MCP9600_HOT_JUNCTION,		       \
+			.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |	       \
+					      BIT(IIO_CHAN_INFO_THERMOCOUPLE_TYPE) | \
+					      BIT(IIO_CHAN_INFO_SCALE),	       \
+			.event_spec = &mcp9600_events[hj_ev_spec_off],	       \
+			.num_event_specs = hj_num_ev,			       \
+		},							       \
+		{							       \
+			.type = IIO_TEMP,				       \
+			.address = MCP9600_COLD_JUNCTION,		       \
+			.channel2 = IIO_MOD_TEMP_AMBIENT,		       \
+			.modified = 1,					       \
+			.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |	       \
+					      BIT(IIO_CHAN_INFO_SCALE),	       \
+			.event_spec = &mcp9600_events[cj_ev_spec_off],	       \
+			.num_event_specs = cj_num_ev,			       \
+		},							       \
+	}
+
+static const struct iio_chan_spec mcp9600_channels[][2] = {
+	MCP9600_CHANNELS(0, 0, 0, 0), /* Alerts: - - - - */
+	MCP9600_CHANNELS(1, 0, 0, 0), /* Alerts: 1 - - - */
+	MCP9600_CHANNELS(1, 1, 0, 0), /* Alerts: - 2 - - */
+	MCP9600_CHANNELS(2, 0, 0, 0), /* Alerts: 1 2 - - */
+	MCP9600_CHANNELS(0, 0, 1, 0), /* Alerts: - - 3 - */
+	MCP9600_CHANNELS(1, 0, 1, 0), /* Alerts: 1 - 3 - */
+	MCP9600_CHANNELS(1, 1, 1, 0), /* Alerts: - 2 3 - */
+	MCP9600_CHANNELS(2, 0, 1, 0), /* Alerts: 1 2 3 - */
+	MCP9600_CHANNELS(0, 0, 1, 1), /* Alerts: - - - 4 */
+	MCP9600_CHANNELS(1, 0, 1, 1), /* Alerts: 1 - - 4 */
+	MCP9600_CHANNELS(1, 1, 1, 1), /* Alerts: - 2 - 4 */
+	MCP9600_CHANNELS(2, 0, 1, 1), /* Alerts: 1 2 - 4 */
+	MCP9600_CHANNELS(0, 0, 2, 0), /* Alerts: - - 3 4 */
+	MCP9600_CHANNELS(1, 0, 2, 0), /* Alerts: 1 - 3 4 */
+	MCP9600_CHANNELS(1, 1, 2, 0), /* Alerts: - 2 3 4 */
+	MCP9600_CHANNELS(2, 0, 2, 0), /* Alerts: 1 2 3 4 */
+};
+
+static int mcp9600_read(struct mcp9600_data *data,
+			struct iio_chan_spec const *chan, int *val)
+{
+	int ret;
+
+	ret = i2c_smbus_read_word_swapped(data->client, chan->address);
+
+	if (ret < 0)
+		return ret;
+
+	*val = sign_extend32(ret, 15);
+
+	return 0;
+}
+
+static int mcp9600_read_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan, int *val,
+			    int *val2, long mask)
+{
+	struct mcp9600_data *data = iio_priv(indio_dev);
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		ret = mcp9600_read(data, chan, val);
+		if (ret)
+			return ret;
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SCALE:
+		*val = 62;
+		*val2 = 500000;
+		return IIO_VAL_INT_PLUS_MICRO;
+	case IIO_CHAN_INFO_THERMOCOUPLE_TYPE:
+		*val = mcp9600_tc_types[data->thermocouple_type];
+		return IIO_VAL_CHAR;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int mcp9600_get_alert_index(int channel2, enum iio_event_direction dir)
+{
+	if (channel2 == IIO_MOD_TEMP_AMBIENT) {
+		if (dir == IIO_EV_DIR_RISING)
+			return MCP9600_ALERT3;
+		else
+			return MCP9600_ALERT4;
+	} else {
+		if (dir == IIO_EV_DIR_RISING)
+			return MCP9600_ALERT1;
+		else
+			return MCP9600_ALERT2;
+	}
+}
+
+static int mcp9600_read_event_config(struct iio_dev *indio_dev,
+				     const struct iio_chan_spec *chan,
+				     enum iio_event_type type,
+				     enum iio_event_direction dir)
+{
+	struct mcp9600_data *data = iio_priv(indio_dev);
+	struct i2c_client *client = data->client;
+	int i, ret;
+
+	i = mcp9600_get_alert_index(chan->channel2, dir);
+	ret = i2c_smbus_read_byte_data(client, MCP9600_ALERT_CFG(i + 1));
+	if (ret < 0)
+		return ret;
+
+	return FIELD_GET(MCP9600_ALERT_CFG_ENABLE, ret);
+}
+
+static int mcp9600_write_event_config(struct iio_dev *indio_dev,
+				      const struct iio_chan_spec *chan,
+				      enum iio_event_type type,
+				      enum iio_event_direction dir,
+				      bool state)
+{
+	struct mcp9600_data *data = iio_priv(indio_dev);
+	struct i2c_client *client = data->client;
+	int i, ret;
+
+	i = mcp9600_get_alert_index(chan->channel2, dir);
+	ret = i2c_smbus_read_byte_data(client, MCP9600_ALERT_CFG(i + 1));
+	if (ret < 0)
+		return ret;
+
+	if (state)
+		ret |= MCP9600_ALERT_CFG_ENABLE;
+	else
+		ret &= ~MCP9600_ALERT_CFG_ENABLE;
+
+	return i2c_smbus_write_byte_data(client, MCP9600_ALERT_CFG(i + 1), ret);
+}
+
+static int mcp9600_read_thresh(struct iio_dev *indio_dev,
+			       const struct iio_chan_spec *chan,
+			       enum iio_event_type type,
+			       enum iio_event_direction dir,
+			       enum iio_event_info info, int *val, int *val2)
+{
+	struct mcp9600_data *data = iio_priv(indio_dev);
+	struct i2c_client *client = data->client;
+	s32 ret;
+	int i;
+
+	i = mcp9600_get_alert_index(chan->channel2, dir);
+	switch (info) {
+	case IIO_EV_INFO_VALUE:
+		ret = i2c_smbus_read_word_swapped(client, MCP9600_ALERT_LIMIT(i + 1));
+		if (ret < 0)
+			return ret;
+		/*
+		 * Temperature is stored in two’s complement format in
+		 * bits(15:2), LSB is 0.25 degree celsius.
+		 */
+		*val = FIELD_GET_SIGNED(MCP9600_ALERT_LIMIT_MASK, ret);
+		*val2 = 4;
+		return IIO_VAL_FRACTIONAL;
+	case IIO_EV_INFO_HYSTERESIS:
+		ret = i2c_smbus_read_byte_data(client, MCP9600_ALERT_HYSTERESIS(i + 1));
+		if (ret < 0)
+			return ret;
+
+		*val = ret;
+		return IIO_VAL_INT;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int mcp9600_write_thresh(struct iio_dev *indio_dev,
+				const struct iio_chan_spec *chan,
+				enum iio_event_type type,
+				enum iio_event_direction dir,
+				enum iio_event_info info, int val, int val2)
+{
+	struct mcp9600_data *data = iio_priv(indio_dev);
+	struct i2c_client *client = data->client;
+	int s_val, i;
+	s16 thresh;
+	u8 hyst;
+
+	i = mcp9600_get_alert_index(chan->channel2, dir);
+	switch (info) {
+	case IIO_EV_INFO_VALUE:
+		/* Scale value to include decimal part into calculations */
+		s_val = (val < 0) ? ((val * 1000000) - val2) :
+				    ((val * 1000000) + val2);
+		if (chan->channel2 == IIO_MOD_TEMP_AMBIENT) {
+			s_val = max(s_val, MCP9600_MIN_TEMP_COLD_JUNCTION_MICRO);
+			s_val = min(s_val, MCP9600_MAX_TEMP_COLD_JUNCTION_MICRO);
+		} else {
+			s_val = max(s_val, MCP9600_MIN_TEMP_HOT_JUNCTION_MICRO);
+			s_val = min(s_val, MCP9600_MAX_TEMP_HOT_JUNCTION_MICRO);
+		}
+
+		/*
+		 * Shift length 4 bits = 2(15:2) + 2(0.25 LSB), temperature is
+		 * stored in two’s complement format.
+		 */
+		thresh = (s16)(s_val / (1000000 >> 4));
+		return i2c_smbus_write_word_swapped(client,
+						    MCP9600_ALERT_LIMIT(i + 1),
+						    thresh);
+	case IIO_EV_INFO_HYSTERESIS:
+		hyst = min(abs(val), 255);
+		return i2c_smbus_write_byte_data(client,
+						 MCP9600_ALERT_HYSTERESIS(i + 1),
+						 hyst);
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct iio_info mcp9600_info = {
+	.read_raw = mcp9600_read_raw,
+	.read_event_config = mcp9600_read_event_config,
+	.write_event_config = mcp9600_write_event_config,
+	.read_event_value = mcp9600_read_thresh,
+	.write_event_value = mcp9600_write_thresh,
+};
+
+static irqreturn_t mcp9600_alert_handler(void *private,
+					 enum mcp9600_alert alert,
+					 enum iio_modifier mod,
+					 enum iio_event_direction dir)
+{
+	struct iio_dev *indio_dev = private;
+	struct mcp9600_data *data = iio_priv(indio_dev);
+	int ret;
+
+	ret = i2c_smbus_read_byte_data(data->client, MCP9600_STATUS);
+	if (ret < 0)
+		return IRQ_HANDLED;
+
+	if (!(ret & MCP9600_STATUS_ALERT(alert)))
+		return IRQ_NONE;
+
+	iio_push_event(indio_dev,
+		       IIO_MOD_EVENT_CODE(IIO_TEMP, 0, mod, IIO_EV_TYPE_THRESH,
+					  dir),
+		       iio_get_time_ns(indio_dev));
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t mcp9600_alert1_handler(int irq, void *private)
+{
+	return mcp9600_alert_handler(private, MCP9600_ALERT1, IIO_NO_MOD,
+				     IIO_EV_DIR_RISING);
+}
+
+static irqreturn_t mcp9600_alert2_handler(int irq, void *private)
+{
+	return mcp9600_alert_handler(private, MCP9600_ALERT2, IIO_NO_MOD,
+				     IIO_EV_DIR_FALLING);
+}
+
+static irqreturn_t mcp9600_alert3_handler(int irq, void *private)
+{
+	return mcp9600_alert_handler(private, MCP9600_ALERT3,
+				     IIO_MOD_TEMP_AMBIENT, IIO_EV_DIR_RISING);
+}
+
+static irqreturn_t mcp9600_alert4_handler(int irq, void *private)
+{
+	return mcp9600_alert_handler(private, MCP9600_ALERT4,
+				     IIO_MOD_TEMP_AMBIENT, IIO_EV_DIR_FALLING);
+}
+
+static irqreturn_t (*mcp9600_alert_handler_func[MCP9600_ALERT_COUNT]) (int, void *) = {
+	mcp9600_alert1_handler,
+	mcp9600_alert2_handler,
+	mcp9600_alert3_handler,
+	mcp9600_alert4_handler,
+};
+
+static int mcp9600_probe_alerts(struct iio_dev *indio_dev)
+{
+	struct mcp9600_data *data = iio_priv(indio_dev);
+	struct i2c_client *client = data->client;
+	struct device *dev = &client->dev;
+	struct fwnode_handle *fwnode = dev_fwnode(dev);
+	unsigned int irq_type;
+	int ret, irq, i;
+	u8 val, ch_sel;
+
+	/*
+	 * alert1: hot junction, rising temperature
+	 * alert2: hot junction, falling temperature
+	 * alert3: cold junction, rising temperature
+	 * alert4: cold junction, falling temperature
+	 */
+	ch_sel = 0;
+	for (i = 0; i < MCP9600_ALERT_COUNT; i++) {
+		irq = fwnode_irq_get_byname(fwnode, mcp9600_alert_name[i]);
+		if (irq <= 0)
+			continue;
+
+		val = 0;
+		irq_type = irq_get_trigger_type(irq);
+		if (irq_type == IRQ_TYPE_EDGE_RISING)
+			val |= MCP9600_ALERT_CFG_ACTIVE_HIGH;
+
+		if (i == MCP9600_ALERT2 || i == MCP9600_ALERT4)
+			val |= MCP9600_ALERT_CFG_FALLING;
+
+		if (i == MCP9600_ALERT3 || i == MCP9600_ALERT4)
+			val |= MCP9600_ALERT_CFG_COLD_JUNCTION;
+
+		ret = i2c_smbus_write_byte_data(client,
+						MCP9600_ALERT_CFG(i + 1),
+						val);
+		if (ret < 0)
+			return ret;
+
+		ret = devm_request_threaded_irq(dev, irq, NULL,
+						mcp9600_alert_handler_func[i],
+						IRQF_ONESHOT, "mcp9600",
+						indio_dev);
+		if (ret)
+			return ret;
+
+		ch_sel |= BIT(i);
+	}
+
+	return ch_sel;
+}
+
+static int mcp9600_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	const struct mcp_chip_info *chip_info;
+	struct iio_dev *indio_dev;
+	struct mcp9600_data *data;
+	int ch_sel, dev_id, ret;
+
+	chip_info = i2c_get_match_data(client);
+	if (!chip_info)
+		return dev_err_probe(dev, -ENODEV,
+				     "No chip-info found for device\n");
+
+	dev_id = i2c_smbus_read_byte_data(client, MCP9600_DEVICE_ID);
+	if (dev_id < 0)
+		return dev_err_probe(dev, dev_id, "Failed to read device ID\n");
+
+	switch (dev_id) {
+	case MCP9600_DEVICE_ID_MCP9600:
+	case MCP9600_DEVICE_ID_MCP9601:
+		if (dev_id != chip_info->chip_id)
+			dev_warn(dev,
+				 "Expected id %02x, but device responded with %02x\n",
+				 chip_info->chip_id, dev_id);
+		break;
+
+	default:
+		dev_warn(dev, "Unknown id %x, using %x\n", dev_id,
+			 chip_info->chip_id);
+	}
+
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	data = iio_priv(indio_dev);
+	data->client = client;
+
+	/* Accept type from dt with default of Type-K. */
+	data->thermocouple_type = THERMOCOUPLE_TYPE_K;
+	ret = device_property_read_u32(dev, "thermocouple-type",
+				       &data->thermocouple_type);
+	if (ret && ret != -EINVAL)
+		return dev_err_probe(dev, ret,
+				     "Error reading thermocouple-type property\n");
+
+	if (data->thermocouple_type >= ARRAY_SIZE(mcp9600_type_map))
+		return dev_err_probe(dev, -EINVAL,
+				     "Invalid thermocouple-type property %u.\n",
+				     data->thermocouple_type);
+
+	/* Set initial config. */
+	ret = mcp9600_config(data);
+	if (ret)
+		return ret;
+
+	ch_sel = mcp9600_probe_alerts(indio_dev);
+	if (ch_sel < 0)
+		return ch_sel;
+
+	indio_dev->info = &mcp9600_info;
+	indio_dev->name = chip_info->chip_name;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = mcp9600_channels[ch_sel];
+	indio_dev->num_channels = ARRAY_SIZE(mcp9600_channels[ch_sel]);
+
+	return devm_iio_device_register(dev, indio_dev);
+}
+
+static const struct mcp_chip_info mcp9600_chip_info = {
+	.chip_id   = MCP9600_DEVICE_ID_MCP9600,
+	.chip_name = "mcp9600",
+};
+
+static const struct mcp_chip_info mcp9601_chip_info = {
+	.chip_id   = MCP9600_DEVICE_ID_MCP9601,
+	.chip_name = "mcp9601",
+};
+
+static const struct i2c_device_id mcp9600_id[] = {
+	{ .name = "mcp9600", .driver_data = (kernel_ulong_t)&mcp9600_chip_info },
+	{ .name = "mcp9601", .driver_data = (kernel_ulong_t)&mcp9601_chip_info },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, mcp9600_id);
+
+static const struct of_device_id mcp9600_of_match[] = {
+	{ .compatible = "microchip,mcp9600", .data = &mcp9600_chip_info },
+	{ .compatible = "microchip,mcp9601", .data = &mcp9601_chip_info },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, mcp9600_of_match);
+
+static struct i2c_driver mcp9600_driver = {
+	.driver = {
+		.name = "mcp9600",
+		.of_match_table = mcp9600_of_match,
+	},
+	.probe = mcp9600_probe,
+	.id_table = mcp9600_id
+};
+module_i2c_driver(mcp9600_driver);
+
+MODULE_AUTHOR("Dimitri Fedrau <dima.fedrau@gmail.com>");
+MODULE_AUTHOR("Andrew Hepp <andrew.hepp@ahepp.dev>");
+MODULE_DESCRIPTION("Microchip MCP9600 thermocouple EMF converter driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/iio/temperature/mlx90614.c b/drivers/iio/temperature/mlx90614.c
new file mode 100644
index 000000000..27d6ab5f5
--- /dev/null
+++ b/drivers/iio/temperature/mlx90614.c
@@ -0,0 +1,782 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * mlx90614.c - Support for Melexis MLX90614/MLX90615 contactless IR temperature sensor
+ *
+ * Copyright (c) 2014 Peter Meerwald <pmeerw@pmeerw.net>
+ * Copyright (c) 2015 Essensium NV
+ * Copyright (c) 2015 Melexis
+ *
+ * Driver for the Melexis MLX90614/MLX90615 I2C 16-bit IR thermopile sensor
+ *
+ * MLX90614 - 17-bit ADC + MLX90302 DSP
+ * MLX90615 - 16-bit ADC + MLX90325 DSP
+ *
+ * (7-bit I2C slave address 0x5a, 100KHz bus speed only!)
+ *
+ * To wake up from sleep mode, the SDA line must be held low while SCL is high
+ * for at least 33ms.  This is achieved with an extra GPIO that can be connected
+ * directly to the SDA line.  In normal operation, the GPIO is set as input and
+ * will not interfere in I2C communication.  While the GPIO is driven low, the
+ * i2c adapter is locked since it cannot be used by other clients.  The SCL line
+ * always has a pull-up so we do not need an extra GPIO to drive it high.  If
+ * the "wakeup" GPIO is not given, power management will be disabled.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/jiffies.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#define MLX90614_OP_RAM		0x00
+#define MLX90614_OP_EEPROM	0x20
+#define MLX90614_OP_SLEEP	0xff
+
+#define MLX90615_OP_EEPROM	0x10
+#define MLX90615_OP_RAM		0x20
+#define MLX90615_OP_SLEEP	0xc6
+
+/* Control bits in configuration register */
+#define MLX90614_CONFIG_IIR_SHIFT 0 /* IIR coefficient */
+#define MLX90614_CONFIG_IIR_MASK (0x7 << MLX90614_CONFIG_IIR_SHIFT)
+#define MLX90614_CONFIG_DUAL_SHIFT 6 /* single (0) or dual (1) IR sensor */
+#define MLX90614_CONFIG_DUAL_MASK (1 << MLX90614_CONFIG_DUAL_SHIFT)
+#define MLX90614_CONFIG_FIR_SHIFT 8 /* FIR coefficient */
+#define MLX90614_CONFIG_FIR_MASK (0x7 << MLX90614_CONFIG_FIR_SHIFT)
+
+#define MLX90615_CONFIG_IIR_SHIFT 12 /* IIR coefficient */
+#define MLX90615_CONFIG_IIR_MASK (0x7 << MLX90615_CONFIG_IIR_SHIFT)
+
+/* Timings (in ms) */
+#define MLX90614_TIMING_EEPROM 20 /* time for EEPROM write/erase to complete */
+#define MLX90614_TIMING_WAKEUP 34 /* time to hold SDA low for wake-up */
+#define MLX90614_TIMING_STARTUP 250 /* time before first data after wake-up */
+
+#define MLX90615_TIMING_WAKEUP 22 /* time to hold SCL low for wake-up */
+
+#define MLX90614_AUTOSLEEP_DELAY 5000 /* default autosleep delay */
+
+/* Magic constants */
+#define MLX90614_CONST_OFFSET_DEC -13657 /* decimal part of the Kelvin offset */
+#define MLX90614_CONST_OFFSET_REM 500000 /* remainder of offset (273.15*50) */
+#define MLX90614_CONST_SCALE 20 /* Scale in milliKelvin (0.02 * 1000) */
+#define MLX90614_CONST_FIR 0x7 /* Fixed value for FIR part of low pass filter */
+
+struct mlx_chip_info {
+	/* EEPROM offsets with 16-bit data, MSB first */
+	/* emissivity correction coefficient */
+	u8			op_eeprom_emissivity;
+	u8			op_eeprom_config1;
+	/* RAM offsets with 16-bit data, MSB first */
+	/* ambient temperature */
+	u8			op_ram_ta;
+	/* object 1 temperature */
+	u8			op_ram_tobj1;
+	/* object 2 temperature */
+	u8			op_ram_tobj2;
+	u8			op_sleep;
+	/* support for two input channels (MLX90614 only) */
+	u8			dual_channel;
+	u8			wakeup_delay_ms;
+	u16			emissivity_max;
+	u16			fir_config_mask;
+	u16			iir_config_mask;
+	int			iir_valid_offset;
+	u16			iir_values[8];
+	int			iir_freqs[8][2];
+};
+
+struct mlx90614_data {
+	struct i2c_client *client;
+	struct mutex lock; /* for EEPROM access only */
+	struct gpio_desc *wakeup_gpio; /* NULL to disable sleep/wake-up */
+	const struct mlx_chip_info *chip_info; /* Chip hardware details */
+	unsigned long ready_timestamp; /* in jiffies */
+};
+
+/*
+ * Erase an address and write word.
+ * The mutex must be locked before calling.
+ */
+static s32 mlx90614_write_word(const struct i2c_client *client, u8 command,
+			       u16 value)
+{
+	/*
+	 * Note: The mlx90614 requires a PEC on writing but does not send us a
+	 * valid PEC on reading.  Hence, we cannot set I2C_CLIENT_PEC in
+	 * i2c_client.flags.  As a workaround, we use i2c_smbus_xfer here.
+	 */
+	union i2c_smbus_data data;
+	s32 ret;
+
+	dev_dbg(&client->dev, "Writing 0x%x to address 0x%x", value, command);
+
+	data.word = 0x0000; /* erase command */
+	ret = i2c_smbus_xfer(client->adapter, client->addr,
+			     client->flags | I2C_CLIENT_PEC,
+			     I2C_SMBUS_WRITE, command,
+			     I2C_SMBUS_WORD_DATA, &data);
+	if (ret < 0)
+		return ret;
+
+	msleep(MLX90614_TIMING_EEPROM);
+
+	data.word = value; /* actual write */
+	ret = i2c_smbus_xfer(client->adapter, client->addr,
+			     client->flags | I2C_CLIENT_PEC,
+			     I2C_SMBUS_WRITE, command,
+			     I2C_SMBUS_WORD_DATA, &data);
+
+	msleep(MLX90614_TIMING_EEPROM);
+
+	return ret;
+}
+
+/*
+ * Find the IIR value inside iir_values array and return its position
+ * which is equivalent to the bit value in sensor register
+ */
+static inline s32 mlx90614_iir_search(const struct i2c_client *client,
+				      int value)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(client);
+	struct mlx90614_data *data = iio_priv(indio_dev);
+	const struct mlx_chip_info *chip_info = data->chip_info;
+	int i;
+	s32 ret;
+
+	for (i = chip_info->iir_valid_offset;
+	     i < ARRAY_SIZE(chip_info->iir_values);
+	     i++) {
+		if (value == chip_info->iir_values[i])
+			break;
+	}
+
+	if (i == ARRAY_SIZE(chip_info->iir_values))
+		return -EINVAL;
+
+	/*
+	 * CONFIG register values must not be changed so
+	 * we must read them before we actually write
+	 * changes
+	 */
+	ret = i2c_smbus_read_word_data(client, chip_info->op_eeprom_config1);
+	if (ret < 0)
+		return ret;
+
+	/* Modify FIR on parts which have configurable FIR filter */
+	if (chip_info->fir_config_mask) {
+		ret &= ~chip_info->fir_config_mask;
+		ret |= field_prep(chip_info->fir_config_mask, MLX90614_CONST_FIR);
+	}
+
+	ret &= ~chip_info->iir_config_mask;
+	ret |= field_prep(chip_info->iir_config_mask, i);
+
+	/* Write changed values */
+	ret = mlx90614_write_word(client, chip_info->op_eeprom_config1, ret);
+	return ret;
+}
+
+#ifdef CONFIG_PM
+/*
+ * If @startup is true, make sure MLX90614_TIMING_STARTUP ms have elapsed since
+ * the last wake-up.  This is normally only needed to get a valid temperature
+ * reading.  EEPROM access does not need such delay.
+ * Return 0 on success, <0 on error.
+ */
+static int mlx90614_power_get(struct mlx90614_data *data, bool startup)
+{
+	unsigned long now;
+	int ret;
+
+	if (!data->wakeup_gpio)
+		return 0;
+
+	ret = pm_runtime_resume_and_get(&data->client->dev);
+	if (ret < 0)
+		return ret;
+
+	if (startup) {
+		now = jiffies;
+		if (time_before(now, data->ready_timestamp) &&
+		    msleep_interruptible(jiffies_to_msecs(
+				data->ready_timestamp - now)) != 0) {
+			pm_runtime_put_autosuspend(&data->client->dev);
+			return -EINTR;
+		}
+	}
+
+	return 0;
+}
+
+static void mlx90614_power_put(struct mlx90614_data *data)
+{
+	if (!data->wakeup_gpio)
+		return;
+
+	pm_runtime_put_autosuspend(&data->client->dev);
+}
+#else
+static inline int mlx90614_power_get(struct mlx90614_data *data, bool startup)
+{
+	return 0;
+}
+
+static inline void mlx90614_power_put(struct mlx90614_data *data)
+{
+}
+#endif
+
+static int mlx90614_read_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *channel, int *val,
+			    int *val2, long mask)
+{
+	struct mlx90614_data *data = iio_priv(indio_dev);
+	const struct mlx_chip_info *chip_info = data->chip_info;
+	u8 cmd, idx;
+	s32 ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW: /* 0.02K / LSB */
+		switch (channel->channel2) {
+		case IIO_MOD_TEMP_AMBIENT:
+			cmd = chip_info->op_ram_ta;
+			break;
+		case IIO_MOD_TEMP_OBJECT:
+			if (chip_info->dual_channel && channel->channel)
+				return -EINVAL;
+
+			switch (channel->channel) {
+			case 0:
+				cmd = chip_info->op_ram_tobj1;
+				break;
+			case 1:
+				cmd = chip_info->op_ram_tobj2;
+				break;
+			default:
+				return -EINVAL;
+			}
+			break;
+		default:
+			return -EINVAL;
+		}
+
+		ret = mlx90614_power_get(data, true);
+		if (ret < 0)
+			return ret;
+		ret = i2c_smbus_read_word_data(data->client, cmd);
+		mlx90614_power_put(data);
+
+		if (ret < 0)
+			return ret;
+
+		/* MSB is an error flag */
+		if (ret & 0x8000)
+			return -EIO;
+
+		*val = ret;
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_OFFSET:
+		*val = MLX90614_CONST_OFFSET_DEC;
+		*val2 = MLX90614_CONST_OFFSET_REM;
+		return IIO_VAL_INT_PLUS_MICRO;
+	case IIO_CHAN_INFO_SCALE:
+		*val = MLX90614_CONST_SCALE;
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_CALIBEMISSIVITY: /* 1/emissivity_max / LSB */
+		ret = mlx90614_power_get(data, false);
+		if (ret < 0)
+			return ret;
+
+		mutex_lock(&data->lock);
+		ret = i2c_smbus_read_word_data(data->client,
+					       chip_info->op_eeprom_emissivity);
+		mutex_unlock(&data->lock);
+		mlx90614_power_put(data);
+
+		if (ret < 0)
+			return ret;
+
+		if (ret == chip_info->emissivity_max) {
+			*val = 1;
+			*val2 = 0;
+		} else {
+			*val = 0;
+			*val2 = ret * NSEC_PER_SEC / chip_info->emissivity_max;
+		}
+		return IIO_VAL_INT_PLUS_NANO;
+	/* IIR setting with FIR=1024 (MLX90614) or FIR=65536 (MLX90615) */
+	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
+		ret = mlx90614_power_get(data, false);
+		if (ret < 0)
+			return ret;
+
+		mutex_lock(&data->lock);
+		ret = i2c_smbus_read_word_data(data->client,
+					       chip_info->op_eeprom_config1);
+		mutex_unlock(&data->lock);
+		mlx90614_power_put(data);
+
+		if (ret < 0)
+			return ret;
+
+		idx = field_get(chip_info->iir_config_mask, ret) -
+		      chip_info->iir_valid_offset;
+
+		*val = chip_info->iir_values[idx] / 100;
+		*val2 = (chip_info->iir_values[idx] % 100) * 10000;
+		return IIO_VAL_INT_PLUS_MICRO;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int mlx90614_write_raw(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *channel, int val,
+			     int val2, long mask)
+{
+	struct mlx90614_data *data = iio_priv(indio_dev);
+	const struct mlx_chip_info *chip_info = data->chip_info;
+	s32 ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_CALIBEMISSIVITY: /* 1/emissivity_max / LSB */
+		if (val < 0 || val2 < 0 || val > 1 || (val == 1 && val2 != 0))
+			return -EINVAL;
+		val = val * chip_info->emissivity_max +
+		      val2 * chip_info->emissivity_max / NSEC_PER_SEC;
+
+		ret = mlx90614_power_get(data, false);
+		if (ret < 0)
+			return ret;
+
+		mutex_lock(&data->lock);
+		ret = mlx90614_write_word(data->client,
+					  chip_info->op_eeprom_emissivity, val);
+		mutex_unlock(&data->lock);
+		mlx90614_power_put(data);
+
+		return ret;
+	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: /* IIR Filter setting */
+		if (val < 0 || val2 < 0)
+			return -EINVAL;
+
+		ret = mlx90614_power_get(data, false);
+		if (ret < 0)
+			return ret;
+
+		mutex_lock(&data->lock);
+		ret = mlx90614_iir_search(data->client,
+					  val * 100 + val2 / 10000);
+		mutex_unlock(&data->lock);
+		mlx90614_power_put(data);
+
+		return ret;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int mlx90614_write_raw_get_fmt(struct iio_dev *indio_dev,
+				     struct iio_chan_spec const *channel,
+				     long mask)
+{
+	switch (mask) {
+	case IIO_CHAN_INFO_CALIBEMISSIVITY:
+		return IIO_VAL_INT_PLUS_NANO;
+	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
+		return IIO_VAL_INT_PLUS_MICRO;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int mlx90614_read_avail(struct iio_dev *indio_dev,
+			       struct iio_chan_spec const *chan,
+			       const int **vals, int *type, int *length,
+			       long mask)
+{
+	struct mlx90614_data *data = iio_priv(indio_dev);
+	const struct mlx_chip_info *chip_info = data->chip_info;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
+		*vals = (int *)chip_info->iir_freqs;
+		*type = IIO_VAL_INT_PLUS_MICRO;
+		*length = 2 * (ARRAY_SIZE(chip_info->iir_freqs) -
+			       chip_info->iir_valid_offset);
+		return IIO_AVAIL_LIST;
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct iio_chan_spec mlx90614_channels[] = {
+	{
+		.type = IIO_TEMP,
+		.modified = 1,
+		.channel2 = IIO_MOD_TEMP_AMBIENT,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
+		    BIT(IIO_CHAN_INFO_SCALE),
+	},
+	{
+		.type = IIO_TEMP,
+		.modified = 1,
+		.channel2 = IIO_MOD_TEMP_OBJECT,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+		    BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) |
+			BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
+		.info_mask_separate_available =
+			BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
+		    BIT(IIO_CHAN_INFO_SCALE),
+	},
+	{
+		.type = IIO_TEMP,
+		.indexed = 1,
+		.modified = 1,
+		.channel = 1,
+		.channel2 = IIO_MOD_TEMP_OBJECT,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+		    BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) |
+			BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
+		.info_mask_separate_available =
+			BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
+		    BIT(IIO_CHAN_INFO_SCALE),
+	},
+};
+
+static const struct iio_info mlx90614_info = {
+	.read_raw = mlx90614_read_raw,
+	.write_raw = mlx90614_write_raw,
+	.write_raw_get_fmt = mlx90614_write_raw_get_fmt,
+	.read_avail = mlx90614_read_avail,
+};
+
+#ifdef CONFIG_PM
+static int mlx90614_sleep(struct mlx90614_data *data)
+{
+	const struct mlx_chip_info *chip_info = data->chip_info;
+	s32 ret;
+
+	if (!data->wakeup_gpio) {
+		dev_dbg(&data->client->dev, "Sleep disabled");
+		return -ENOSYS;
+	}
+
+	dev_dbg(&data->client->dev, "Requesting sleep");
+
+	mutex_lock(&data->lock);
+	ret = i2c_smbus_xfer(data->client->adapter, data->client->addr,
+			     data->client->flags | I2C_CLIENT_PEC,
+			     I2C_SMBUS_WRITE, chip_info->op_sleep,
+			     I2C_SMBUS_BYTE, NULL);
+	mutex_unlock(&data->lock);
+
+	return ret;
+}
+
+static int mlx90614_wakeup(struct mlx90614_data *data)
+{
+	const struct mlx_chip_info *chip_info = data->chip_info;
+
+	if (!data->wakeup_gpio) {
+		dev_dbg(&data->client->dev, "Wake-up disabled");
+		return -ENOSYS;
+	}
+
+	dev_dbg(&data->client->dev, "Requesting wake-up");
+
+	i2c_lock_bus(data->client->adapter, I2C_LOCK_ROOT_ADAPTER);
+	gpiod_direction_output(data->wakeup_gpio, 0);
+	msleep(chip_info->wakeup_delay_ms);
+	gpiod_direction_input(data->wakeup_gpio);
+	i2c_unlock_bus(data->client->adapter, I2C_LOCK_ROOT_ADAPTER);
+
+	data->ready_timestamp = jiffies +
+			msecs_to_jiffies(MLX90614_TIMING_STARTUP);
+
+	/*
+	 * Quirk: the i2c controller may get confused right after the
+	 * wake-up signal has been sent.  As a workaround, do a dummy read.
+	 * If the read fails, the controller will probably be reset so that
+	 * further reads will work.
+	 */
+	i2c_smbus_read_word_data(data->client, chip_info->op_eeprom_config1);
+
+	return 0;
+}
+
+/* Return wake-up GPIO or NULL if sleep functionality should be disabled. */
+static struct gpio_desc *mlx90614_probe_wakeup(struct i2c_client *client)
+{
+	struct gpio_desc *gpio;
+
+	if (!i2c_check_functionality(client->adapter,
+						I2C_FUNC_SMBUS_WRITE_BYTE)) {
+		dev_info(&client->dev,
+			 "i2c adapter does not support SMBUS_WRITE_BYTE, sleep disabled");
+		return NULL;
+	}
+
+	gpio = devm_gpiod_get_optional(&client->dev, "wakeup", GPIOD_IN);
+
+	if (IS_ERR(gpio)) {
+		dev_warn(&client->dev,
+			 "gpio acquisition failed with error %ld, sleep disabled",
+			 PTR_ERR(gpio));
+		return NULL;
+	} else if (!gpio) {
+		dev_info(&client->dev,
+			 "wakeup-gpio not found, sleep disabled");
+	}
+
+	return gpio;
+}
+#else
+static inline int mlx90614_sleep(struct mlx90614_data *data)
+{
+	return -ENOSYS;
+}
+static inline int mlx90614_wakeup(struct mlx90614_data *data)
+{
+	return -ENOSYS;
+}
+static inline struct gpio_desc *mlx90614_probe_wakeup(struct i2c_client *client)
+{
+	return NULL;
+}
+#endif
+
+/* Return 0 for single sensor, 1 for dual sensor, <0 on error. */
+static int mlx90614_probe_num_ir_sensors(struct i2c_client *client)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(client);
+	struct mlx90614_data *data = iio_priv(indio_dev);
+	const struct mlx_chip_info *chip_info = data->chip_info;
+	s32 ret;
+
+	if (chip_info->dual_channel)
+		return 0;
+
+	ret = i2c_smbus_read_word_data(client, chip_info->op_eeprom_config1);
+
+	if (ret < 0)
+		return ret;
+
+	return (ret & MLX90614_CONFIG_DUAL_MASK) ? 1 : 0;
+}
+
+static int mlx90614_probe(struct i2c_client *client)
+{
+	const struct i2c_device_id *id = i2c_client_get_device_id(client);
+	struct iio_dev *indio_dev;
+	struct mlx90614_data *data;
+	int ret;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
+		return -EOPNOTSUPP;
+
+	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	data = iio_priv(indio_dev);
+	i2c_set_clientdata(client, indio_dev);
+	data->client = client;
+	mutex_init(&data->lock);
+	data->wakeup_gpio = mlx90614_probe_wakeup(client);
+	data->chip_info = i2c_get_match_data(client);
+
+	mlx90614_wakeup(data);
+
+	indio_dev->name = id->name;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->info = &mlx90614_info;
+
+	ret = mlx90614_probe_num_ir_sensors(client);
+	switch (ret) {
+	case 0:
+		dev_dbg(&client->dev, "Found single sensor");
+		indio_dev->channels = mlx90614_channels;
+		indio_dev->num_channels = 2;
+		break;
+	case 1:
+		dev_dbg(&client->dev, "Found dual sensor");
+		indio_dev->channels = mlx90614_channels;
+		indio_dev->num_channels = 3;
+		break;
+	default:
+		return ret;
+	}
+
+	if (data->wakeup_gpio) {
+		pm_runtime_set_autosuspend_delay(&client->dev,
+						 MLX90614_AUTOSLEEP_DELAY);
+		pm_runtime_use_autosuspend(&client->dev);
+		pm_runtime_set_active(&client->dev);
+		pm_runtime_enable(&client->dev);
+	}
+
+	return iio_device_register(indio_dev);
+}
+
+static void mlx90614_remove(struct i2c_client *client)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(client);
+	struct mlx90614_data *data = iio_priv(indio_dev);
+
+	iio_device_unregister(indio_dev);
+
+	if (data->wakeup_gpio) {
+		pm_runtime_disable(&client->dev);
+		if (!pm_runtime_status_suspended(&client->dev))
+			mlx90614_sleep(data);
+		pm_runtime_set_suspended(&client->dev);
+	}
+}
+
+static const struct mlx_chip_info mlx90614_chip_info = {
+	.op_eeprom_emissivity		= MLX90614_OP_EEPROM | 0x04,
+	.op_eeprom_config1		= MLX90614_OP_EEPROM | 0x05,
+	.op_ram_ta			= MLX90614_OP_RAM | 0x06,
+	.op_ram_tobj1			= MLX90614_OP_RAM | 0x07,
+	.op_ram_tobj2			= MLX90614_OP_RAM | 0x08,
+	.op_sleep			= MLX90614_OP_SLEEP,
+	.dual_channel			= true,
+	.wakeup_delay_ms		= MLX90614_TIMING_WAKEUP,
+	.emissivity_max			= 65535,
+	.fir_config_mask		= MLX90614_CONFIG_FIR_MASK,
+	.iir_config_mask		= MLX90614_CONFIG_IIR_MASK,
+	.iir_valid_offset		= 0,
+	.iir_values			= { 77, 31, 20, 15, 723, 153, 110, 86 },
+	.iir_freqs			= {
+		{ 0, 150000 },	/* 13% ~= 0.15 Hz */
+		{ 0, 200000 },	/* 17% ~= 0.20 Hz */
+		{ 0, 310000 },	/* 25% ~= 0.31 Hz */
+		{ 0, 770000 },	/* 50% ~= 0.77 Hz */
+		{ 0, 860000 },	/* 57% ~= 0.86 Hz */
+		{ 1, 100000 },	/* 67% ~= 1.10 Hz */
+		{ 1, 530000 },	/* 80% ~= 1.53 Hz */
+		{ 7, 230000 }	/* 100% ~= 7.23 Hz */
+	},
+};
+
+static const struct mlx_chip_info mlx90615_chip_info = {
+	.op_eeprom_emissivity		= MLX90615_OP_EEPROM | 0x03,
+	.op_eeprom_config1		= MLX90615_OP_EEPROM | 0x02,
+	.op_ram_ta			= MLX90615_OP_RAM | 0x06,
+	.op_ram_tobj1			= MLX90615_OP_RAM | 0x07,
+	.op_ram_tobj2			= MLX90615_OP_RAM | 0x08,
+	.op_sleep			= MLX90615_OP_SLEEP,
+	.dual_channel			= false,
+	.wakeup_delay_ms		= MLX90615_TIMING_WAKEUP,
+	.emissivity_max			= 16383,
+	.fir_config_mask		= 0,	/* MLX90615 FIR is fixed */
+	.iir_config_mask		= MLX90615_CONFIG_IIR_MASK,
+	/* IIR value 0 is FORBIDDEN COMBINATION on MLX90615 */
+	.iir_valid_offset		= 1,
+	.iir_values			= { 500, 50, 30, 20, 15, 13, 10 },
+	.iir_freqs			= {
+		{ 0, 100000 },	/* 14% ~= 0.10 Hz */
+		{ 0, 130000 },	/* 17% ~= 0.13 Hz */
+		{ 0, 150000 },	/* 20% ~= 0.15 Hz */
+		{ 0, 200000 },	/* 25% ~= 0.20 Hz */
+		{ 0, 300000 },	/* 33% ~= 0.30 Hz */
+		{ 0, 500000 },	/* 50% ~= 0.50 Hz */
+		{ 5, 000000 },	/* 100% ~= 5.00 Hz */
+	},
+};
+
+static const struct i2c_device_id mlx90614_id[] = {
+	{ .name = "mlx90614", .driver_data = (kernel_ulong_t)&mlx90614_chip_info },
+	{ .name = "mlx90615", .driver_data = (kernel_ulong_t)&mlx90615_chip_info },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, mlx90614_id);
+
+static const struct of_device_id mlx90614_of_match[] = {
+	{ .compatible = "melexis,mlx90614", .data = &mlx90614_chip_info },
+	{ .compatible = "melexis,mlx90615", .data = &mlx90615_chip_info },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, mlx90614_of_match);
+
+static int mlx90614_pm_suspend(struct device *dev)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+	struct mlx90614_data *data = iio_priv(indio_dev);
+
+	if (data->wakeup_gpio && pm_runtime_active(dev))
+		return mlx90614_sleep(data);
+
+	return 0;
+}
+
+static int mlx90614_pm_resume(struct device *dev)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+	struct mlx90614_data *data = iio_priv(indio_dev);
+	int err;
+
+	if (data->wakeup_gpio) {
+		err = mlx90614_wakeup(data);
+		if (err < 0)
+			return err;
+
+		pm_runtime_disable(dev);
+		pm_runtime_set_active(dev);
+		pm_runtime_enable(dev);
+	}
+
+	return 0;
+}
+
+static int mlx90614_pm_runtime_suspend(struct device *dev)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+	struct mlx90614_data *data = iio_priv(indio_dev);
+
+	return mlx90614_sleep(data);
+}
+
+static int mlx90614_pm_runtime_resume(struct device *dev)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+	struct mlx90614_data *data = iio_priv(indio_dev);
+
+	return mlx90614_wakeup(data);
+}
+
+static const struct dev_pm_ops mlx90614_pm_ops = {
+	SYSTEM_SLEEP_PM_OPS(mlx90614_pm_suspend, mlx90614_pm_resume)
+	RUNTIME_PM_OPS(mlx90614_pm_runtime_suspend,
+		       mlx90614_pm_runtime_resume, NULL)
+};
+
+static struct i2c_driver mlx90614_driver = {
+	.driver = {
+		.name	= "mlx90614",
+		.of_match_table = mlx90614_of_match,
+		.pm	= pm_ptr(&mlx90614_pm_ops),
+	},
+	.probe = mlx90614_probe,
+	.remove = mlx90614_remove,
+	.id_table = mlx90614_id,
+};
+module_i2c_driver(mlx90614_driver);
+
+MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
+MODULE_AUTHOR("Vianney le Clément de Saint-Marcq <vianney.leclement@essensium.com>");
+MODULE_AUTHOR("Crt Mori <cmo@melexis.com>");
+MODULE_DESCRIPTION("Melexis MLX90614 contactless IR temperature sensor driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/iio/temperature/mlx90632.c b/drivers/iio/temperature/mlx90632.c
new file mode 100644
index 000000000..2fde48f33
--- /dev/null
+++ b/drivers/iio/temperature/mlx90632.c
@@ -0,0 +1,1343 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * mlx90632.c - Melexis MLX90632 contactless IR temperature sensor
+ *
+ * Copyright (c) 2017 Melexis <cmo@melexis.com>
+ *
+ * Driver for the Melexis MLX90632 I2C 16-bit IR thermopile sensor
+ */
+#include <linux/bitfield.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/iopoll.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/limits.h>
+#include <linux/module.h>
+#include <linux/math64.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+/* Memory sections addresses */
+#define MLX90632_ADDR_RAM	0x4000 /* Start address of ram */
+#define MLX90632_ADDR_EEPROM	0x2480 /* Start address of user eeprom */
+
+/* EEPROM addresses - used at startup */
+#define MLX90632_EE_CTRL	0x24d4 /* Control register initial value */
+#define MLX90632_EE_I2C_ADDR	0x24d5 /* I2C address register initial value */
+#define MLX90632_EE_VERSION	0x240b /* EEPROM version reg address */
+#define MLX90632_EE_P_R		0x240c /* P_R calibration register 32bit */
+#define MLX90632_EE_P_G		0x240e /* P_G calibration register 32bit */
+#define MLX90632_EE_P_T		0x2410 /* P_T calibration register 32bit */
+#define MLX90632_EE_P_O		0x2412 /* P_O calibration register 32bit */
+#define MLX90632_EE_Aa		0x2414 /* Aa calibration register 32bit */
+#define MLX90632_EE_Ab		0x2416 /* Ab calibration register 32bit */
+#define MLX90632_EE_Ba		0x2418 /* Ba calibration register 32bit */
+#define MLX90632_EE_Bb		0x241a /* Bb calibration register 32bit */
+#define MLX90632_EE_Ca		0x241c /* Ca calibration register 32bit */
+#define MLX90632_EE_Cb		0x241e /* Cb calibration register 32bit */
+#define MLX90632_EE_Da		0x2420 /* Da calibration register 32bit */
+#define MLX90632_EE_Db		0x2422 /* Db calibration register 32bit */
+#define MLX90632_EE_Ea		0x2424 /* Ea calibration register 32bit */
+#define MLX90632_EE_Eb		0x2426 /* Eb calibration register 32bit */
+#define MLX90632_EE_Fa		0x2428 /* Fa calibration register 32bit */
+#define MLX90632_EE_Fb		0x242a /* Fb calibration register 32bit */
+#define MLX90632_EE_Ga		0x242c /* Ga calibration register 32bit */
+
+#define MLX90632_EE_Gb		0x242e /* Gb calibration register 16bit */
+#define MLX90632_EE_Ka		0x242f /* Ka calibration register 16bit */
+
+#define MLX90632_EE_Ha		0x2481 /* Ha customer calib value reg 16bit */
+#define MLX90632_EE_Hb		0x2482 /* Hb customer calib value reg 16bit */
+
+#define MLX90632_EE_MEDICAL_MEAS1      0x24E1 /* Medical measurement 1 16bit */
+#define MLX90632_EE_MEDICAL_MEAS2      0x24E2 /* Medical measurement 2 16bit */
+#define MLX90632_EE_EXTENDED_MEAS1     0x24F1 /* Extended measurement 1 16bit */
+#define MLX90632_EE_EXTENDED_MEAS2     0x24F2 /* Extended measurement 2 16bit */
+#define MLX90632_EE_EXTENDED_MEAS3     0x24F3 /* Extended measurement 3 16bit */
+
+/* Register addresses - volatile */
+#define MLX90632_REG_I2C_ADDR	0x3000 /* Chip I2C address register */
+
+/* Control register address - volatile */
+#define MLX90632_REG_CONTROL	0x3001 /* Control Register address */
+#define   MLX90632_CFG_PWR_MASK		GENMASK(2, 1) /* PowerMode Mask */
+#define   MLX90632_CFG_MTYP_MASK		GENMASK(8, 4) /* Meas select Mask */
+#define   MLX90632_CFG_SOB_MASK BIT(11)
+
+/* PowerModes statuses */
+#define MLX90632_PWR_STATUS(ctrl_val) (ctrl_val << 1)
+#define MLX90632_PWR_STATUS_HALT MLX90632_PWR_STATUS(0) /* hold */
+#define MLX90632_PWR_STATUS_SLEEP_STEP MLX90632_PWR_STATUS(1) /* sleep step */
+#define MLX90632_PWR_STATUS_STEP MLX90632_PWR_STATUS(2) /* step */
+#define MLX90632_PWR_STATUS_CONTINUOUS MLX90632_PWR_STATUS(3) /* continuous */
+
+#define MLX90632_EE_RR GENMASK(10, 8) /* Only Refresh Rate bits */
+#define MLX90632_REFRESH_RATE(ee_val) FIELD_GET(MLX90632_EE_RR, ee_val)
+					/* Extract Refresh Rate from ee register */
+#define MLX90632_REFRESH_RATE_STATUS(refresh_rate) (refresh_rate << 8)
+
+/* Measurement types */
+#define MLX90632_MTYP_MEDICAL 0
+#define MLX90632_MTYP_EXTENDED 17
+
+/* Measurement type select*/
+#define MLX90632_MTYP_STATUS(ctrl_val) (ctrl_val << 4)
+#define MLX90632_MTYP_STATUS_MEDICAL MLX90632_MTYP_STATUS(MLX90632_MTYP_MEDICAL)
+#define MLX90632_MTYP_STATUS_EXTENDED MLX90632_MTYP_STATUS(MLX90632_MTYP_EXTENDED)
+
+/* I2C command register - volatile */
+#define MLX90632_REG_I2C_CMD    0x3005 /* I2C command Register address */
+
+/* Device status register - volatile */
+#define MLX90632_REG_STATUS	0x3fff /* Device status register */
+#define   MLX90632_STAT_BUSY		BIT(10) /* Device busy indicator */
+#define   MLX90632_STAT_EE_BUSY		BIT(9) /* EEPROM busy indicator */
+#define   MLX90632_STAT_BRST		BIT(8) /* Brown out reset indicator */
+#define   MLX90632_STAT_CYCLE_POS	GENMASK(6, 2) /* Data position */
+#define   MLX90632_STAT_DATA_RDY	BIT(0) /* Data ready indicator */
+
+/* RAM_MEAS address-es for each channel */
+#define MLX90632_RAM_1(meas_num)	(MLX90632_ADDR_RAM + 3 * meas_num)
+#define MLX90632_RAM_2(meas_num)	(MLX90632_ADDR_RAM + 3 * meas_num + 1)
+#define MLX90632_RAM_3(meas_num)	(MLX90632_ADDR_RAM + 3 * meas_num + 2)
+
+/* Name important RAM_MEAS channels */
+#define MLX90632_RAM_DSP5_EXTENDED_AMBIENT_1 MLX90632_RAM_3(17)
+#define MLX90632_RAM_DSP5_EXTENDED_AMBIENT_2 MLX90632_RAM_3(18)
+#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_1 MLX90632_RAM_1(17)
+#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_2 MLX90632_RAM_2(17)
+#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_3 MLX90632_RAM_1(18)
+#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_4 MLX90632_RAM_2(18)
+#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_5 MLX90632_RAM_1(19)
+#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_6 MLX90632_RAM_2(19)
+
+/* Magic constants */
+#define MLX90632_ID_MEDICAL	0x0105 /* EEPROM DSPv5 Medical device id */
+#define MLX90632_ID_CONSUMER	0x0205 /* EEPROM DSPv5 Consumer device id */
+#define MLX90632_ID_EXTENDED	0x0505 /* EEPROM DSPv5 Extended range device id */
+#define MLX90632_ID_MASK	GENMASK(14, 0) /* DSP version and device ID in EE_VERSION */
+#define MLX90632_DSP_VERSION	5 /* DSP version */
+#define MLX90632_DSP_MASK	GENMASK(7, 0) /* DSP version in EE_VERSION */
+#define MLX90632_RESET_CMD	0x0006 /* Reset sensor (address or global) */
+#define MLX90632_REF_12 	12LL /* ResCtrlRef value of Ch 1 or Ch 2 */
+#define MLX90632_REF_3		12LL /* ResCtrlRef value of Channel 3 */
+#define MLX90632_MAX_MEAS_NUM	31 /* Maximum measurements in list */
+#define MLX90632_SLEEP_DELAY_MS 6000 /* Autosleep delay */
+#define MLX90632_EXTENDED_LIMIT 27000 /* Extended mode raw value limit */
+#define MLX90632_MEAS_MAX_TIME 2000 /* Max measurement time in ms for the lowest refresh rate */
+
+/**
+ * struct mlx90632_data - private data for the MLX90632 device
+ * @client: I2C client of the device
+ * @lock: Internal mutex for multiple reads for single measurement
+ * @regmap: Regmap of the device
+ * @emissivity: Object emissivity from 0 to 1000 where 1000 = 1.
+ * @mtyp: Measurement type physical sensor configuration for extended range
+ *        calculations
+ * @object_ambient_temperature: Ambient temperature at object (might differ of
+ *                              the ambient temperature of sensor.
+ * @regulator: Regulator of the device
+ * @powerstatus: Current POWER status of the device
+ * @interaction_ts: Timestamp of the last temperature read that is used
+ *		    for power management in jiffies
+ */
+struct mlx90632_data {
+	struct i2c_client *client;
+	struct mutex lock;
+	struct regmap *regmap;
+	u16 emissivity;
+	u8 mtyp;
+	u32 object_ambient_temperature;
+	struct regulator *regulator;
+	int powerstatus;
+	unsigned long interaction_ts;
+};
+
+static const struct regmap_range mlx90632_volatile_reg_range[] = {
+	regmap_reg_range(MLX90632_REG_I2C_ADDR, MLX90632_REG_CONTROL),
+	regmap_reg_range(MLX90632_REG_I2C_CMD, MLX90632_REG_I2C_CMD),
+	regmap_reg_range(MLX90632_REG_STATUS, MLX90632_REG_STATUS),
+	regmap_reg_range(MLX90632_RAM_1(0),
+			 MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)),
+};
+
+static const struct regmap_access_table mlx90632_volatile_regs_tbl = {
+	.yes_ranges = mlx90632_volatile_reg_range,
+	.n_yes_ranges = ARRAY_SIZE(mlx90632_volatile_reg_range),
+};
+
+static const struct regmap_range mlx90632_read_reg_range[] = {
+	regmap_reg_range(MLX90632_EE_VERSION, MLX90632_EE_Ka),
+	regmap_reg_range(MLX90632_EE_CTRL, MLX90632_EE_I2C_ADDR),
+	regmap_reg_range(MLX90632_EE_Ha, MLX90632_EE_Hb),
+	regmap_reg_range(MLX90632_EE_MEDICAL_MEAS1, MLX90632_EE_MEDICAL_MEAS2),
+	regmap_reg_range(MLX90632_EE_EXTENDED_MEAS1, MLX90632_EE_EXTENDED_MEAS3),
+	regmap_reg_range(MLX90632_REG_I2C_ADDR, MLX90632_REG_CONTROL),
+	regmap_reg_range(MLX90632_REG_I2C_CMD, MLX90632_REG_I2C_CMD),
+	regmap_reg_range(MLX90632_REG_STATUS, MLX90632_REG_STATUS),
+	regmap_reg_range(MLX90632_RAM_1(0),
+			 MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)),
+};
+
+static const struct regmap_access_table mlx90632_readable_regs_tbl = {
+	.yes_ranges = mlx90632_read_reg_range,
+	.n_yes_ranges = ARRAY_SIZE(mlx90632_read_reg_range),
+};
+
+static const struct regmap_range mlx90632_no_write_reg_range[] = {
+	regmap_reg_range(MLX90632_EE_VERSION, MLX90632_EE_Ka),
+	regmap_reg_range(MLX90632_RAM_1(0),
+			 MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)),
+};
+
+static const struct regmap_access_table mlx90632_writeable_regs_tbl = {
+	.no_ranges = mlx90632_no_write_reg_range,
+	.n_no_ranges = ARRAY_SIZE(mlx90632_no_write_reg_range),
+};
+
+static const struct regmap_config mlx90632_regmap = {
+	.reg_bits = 16,
+	.val_bits = 16,
+
+	.volatile_table = &mlx90632_volatile_regs_tbl,
+	.rd_table = &mlx90632_readable_regs_tbl,
+	.wr_table = &mlx90632_writeable_regs_tbl,
+
+	.use_single_read = true,
+	.use_single_write = true,
+	.reg_format_endian = REGMAP_ENDIAN_BIG,
+	.val_format_endian = REGMAP_ENDIAN_BIG,
+	.cache_type = REGCACHE_RBTREE,
+};
+
+static int mlx90632_pwr_set_sleep_step(struct regmap *regmap)
+{
+	struct mlx90632_data *data =
+		iio_priv(dev_get_drvdata(regmap_get_device(regmap)));
+	int ret;
+
+	if (data->powerstatus == MLX90632_PWR_STATUS_SLEEP_STEP)
+		return 0;
+
+	ret = regmap_write_bits(regmap, MLX90632_REG_CONTROL, MLX90632_CFG_PWR_MASK,
+				MLX90632_PWR_STATUS_SLEEP_STEP);
+	if (ret < 0)
+		return ret;
+
+	data->powerstatus = MLX90632_PWR_STATUS_SLEEP_STEP;
+	return 0;
+}
+
+static int mlx90632_pwr_continuous(struct regmap *regmap)
+{
+	struct mlx90632_data *data =
+		iio_priv(dev_get_drvdata(regmap_get_device(regmap)));
+	int ret;
+
+	if (data->powerstatus == MLX90632_PWR_STATUS_CONTINUOUS)
+		return 0;
+
+	ret = regmap_write_bits(regmap, MLX90632_REG_CONTROL, MLX90632_CFG_PWR_MASK,
+				MLX90632_PWR_STATUS_CONTINUOUS);
+	if (ret < 0)
+		return ret;
+
+	data->powerstatus = MLX90632_PWR_STATUS_CONTINUOUS;
+	return 0;
+}
+
+/**
+ * mlx90632_reset_delay() - Give the mlx90632 some time to reset properly
+ * If this is not done, the following I2C command(s) will not be accepted.
+ */
+static void mlx90632_reset_delay(void)
+{
+	usleep_range(150, 200);
+}
+
+static int mlx90632_get_measurement_time(struct regmap *regmap, u16 meas)
+{
+	unsigned int reg;
+	int ret;
+
+	ret = regmap_read(regmap, meas, &reg);
+	if (ret < 0)
+		return ret;
+
+	return MLX90632_MEAS_MAX_TIME >> FIELD_GET(MLX90632_EE_RR, reg);
+}
+
+static int mlx90632_calculate_dataset_ready_time(struct mlx90632_data *data)
+{
+	unsigned int refresh_time;
+	int ret;
+
+	if (data->mtyp == MLX90632_MTYP_MEDICAL) {
+		ret = mlx90632_get_measurement_time(data->regmap,
+						    MLX90632_EE_MEDICAL_MEAS1);
+		if (ret < 0)
+			return ret;
+
+		refresh_time = ret;
+
+		ret = mlx90632_get_measurement_time(data->regmap,
+						    MLX90632_EE_MEDICAL_MEAS2);
+		if (ret < 0)
+			return ret;
+
+		refresh_time += ret;
+	} else {
+		ret = mlx90632_get_measurement_time(data->regmap,
+						    MLX90632_EE_EXTENDED_MEAS1);
+		if (ret < 0)
+			return ret;
+
+		refresh_time = ret;
+
+		ret = mlx90632_get_measurement_time(data->regmap,
+						    MLX90632_EE_EXTENDED_MEAS2);
+		if (ret < 0)
+			return ret;
+
+		refresh_time += ret;
+
+		ret = mlx90632_get_measurement_time(data->regmap,
+						    MLX90632_EE_EXTENDED_MEAS3);
+		if (ret < 0)
+			return ret;
+
+		refresh_time += ret;
+	}
+
+	return refresh_time;
+}
+
+/**
+ * mlx90632_perform_measurement() - Trigger and retrieve current measurement cycle
+ * @data: pointer to mlx90632_data object containing regmap information
+ *
+ * Perform a measurement and return latest measurement cycle position reported
+ * by sensor. This is a blocking function for 500ms, as that is default sensor
+ * refresh rate.
+ */
+static int mlx90632_perform_measurement(struct mlx90632_data *data)
+{
+	unsigned int reg_status;
+	int ret;
+
+	ret = regmap_clear_bits(data->regmap, MLX90632_REG_STATUS,
+				MLX90632_STAT_DATA_RDY);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_read_poll_timeout(data->regmap, MLX90632_REG_STATUS, reg_status,
+				       !(reg_status & MLX90632_STAT_DATA_RDY), 10000,
+				       100 * 10000);
+
+	if (ret < 0) {
+		dev_err(&data->client->dev, "data not ready");
+		return -ETIMEDOUT;
+	}
+
+	return (reg_status & MLX90632_STAT_CYCLE_POS) >> 2;
+}
+
+/**
+ * mlx90632_perform_measurement_burst() - Trigger and retrieve current measurement
+ * cycle in step sleep mode
+ * @data: pointer to mlx90632_data object containing regmap information
+ *
+ * Perform a measurement and return 2 as measurement cycle position reported
+ * by sensor. This is a blocking function for amount dependent on the sensor
+ * refresh rate.
+ */
+static int mlx90632_perform_measurement_burst(struct mlx90632_data *data)
+{
+	unsigned int reg_status;
+	int ret;
+
+	ret = regmap_write_bits(data->regmap, MLX90632_REG_CONTROL,
+				MLX90632_CFG_SOB_MASK, MLX90632_CFG_SOB_MASK);
+	if (ret < 0)
+		return ret;
+
+	ret = mlx90632_calculate_dataset_ready_time(data);
+	if (ret < 0)
+		return ret;
+
+	msleep(ret); /* Wait minimum time for dataset to be ready */
+
+	ret = regmap_read_poll_timeout(data->regmap, MLX90632_REG_STATUS,
+				       reg_status,
+				       (reg_status & MLX90632_STAT_BUSY) == 0,
+				       10000, 100 * 10000);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "data not ready");
+		return -ETIMEDOUT;
+	}
+
+	return 2;
+}
+
+static int mlx90632_set_meas_type(struct mlx90632_data *data, u8 type)
+{
+	int current_powerstatus;
+	int ret;
+
+	if (data->mtyp == type)
+		return 0;
+
+	current_powerstatus = data->powerstatus;
+	ret = mlx90632_pwr_continuous(data->regmap);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_write(data->regmap, MLX90632_REG_I2C_CMD, MLX90632_RESET_CMD);
+	if (ret < 0)
+		return ret;
+
+	mlx90632_reset_delay();
+
+	ret = regmap_update_bits(data->regmap, MLX90632_REG_CONTROL,
+				 (MLX90632_CFG_MTYP_MASK | MLX90632_CFG_PWR_MASK),
+				 (MLX90632_MTYP_STATUS(type) | MLX90632_PWR_STATUS_HALT));
+	if (ret < 0)
+		return ret;
+
+	data->mtyp = type;
+	data->powerstatus = MLX90632_PWR_STATUS_HALT;
+
+	if (current_powerstatus == MLX90632_PWR_STATUS_SLEEP_STEP)
+		return mlx90632_pwr_set_sleep_step(data->regmap);
+
+	return mlx90632_pwr_continuous(data->regmap);
+}
+
+static int mlx90632_channel_new_select(int perform_ret, uint8_t *channel_new,
+				       uint8_t *channel_old)
+{
+	switch (perform_ret) {
+	case 1:
+		*channel_new = 1;
+		*channel_old = 2;
+		break;
+	case 2:
+		*channel_new = 2;
+		*channel_old = 1;
+		break;
+	default:
+		return -ECHRNG;
+	}
+
+	return 0;
+}
+
+static int mlx90632_read_ambient_raw(struct regmap *regmap,
+				     s16 *ambient_new_raw, s16 *ambient_old_raw)
+{
+	unsigned int read_tmp;
+	int ret;
+
+	ret = regmap_read(regmap, MLX90632_RAM_3(1), &read_tmp);
+	if (ret < 0)
+		return ret;
+	*ambient_new_raw = (s16)read_tmp;
+
+	ret = regmap_read(regmap, MLX90632_RAM_3(2), &read_tmp);
+	if (ret < 0)
+		return ret;
+	*ambient_old_raw = (s16)read_tmp;
+
+	return ret;
+}
+
+static int mlx90632_read_object_raw(struct regmap *regmap,
+				    int perform_measurement_ret,
+				    s16 *object_new_raw, s16 *object_old_raw)
+{
+	unsigned int read_tmp;
+	u8 channel_old = 0;
+	u8 channel = 0;
+	s16 read;
+	int ret;
+
+	ret = mlx90632_channel_new_select(perform_measurement_ret, &channel,
+					  &channel_old);
+	if (ret != 0)
+		return ret;
+
+	ret = regmap_read(regmap, MLX90632_RAM_2(channel), &read_tmp);
+	if (ret < 0)
+		return ret;
+
+	read = (s16)read_tmp;
+
+	ret = regmap_read(regmap, MLX90632_RAM_1(channel), &read_tmp);
+	if (ret < 0)
+		return ret;
+	*object_new_raw = (read + (s16)read_tmp) / 2;
+
+	ret = regmap_read(regmap, MLX90632_RAM_2(channel_old), &read_tmp);
+	if (ret < 0)
+		return ret;
+	read = (s16)read_tmp;
+
+	ret = regmap_read(regmap, MLX90632_RAM_1(channel_old), &read_tmp);
+	if (ret < 0)
+		return ret;
+	*object_old_raw = (read + (s16)read_tmp) / 2;
+
+	return ret;
+}
+
+static int mlx90632_read_all_channel(struct mlx90632_data *data,
+				     s16 *ambient_new_raw, s16 *ambient_old_raw,
+				     s16 *object_new_raw, s16 *object_old_raw)
+{
+	s32 measurement;
+	int ret;
+
+	mutex_lock(&data->lock);
+	ret = mlx90632_set_meas_type(data, MLX90632_MTYP_MEDICAL);
+	if (ret < 0)
+		goto read_unlock;
+
+	switch (data->powerstatus) {
+	case MLX90632_PWR_STATUS_CONTINUOUS:
+		ret = mlx90632_perform_measurement(data);
+		if (ret < 0)
+			goto read_unlock;
+
+		break;
+	case MLX90632_PWR_STATUS_SLEEP_STEP:
+		ret = mlx90632_perform_measurement_burst(data);
+		if (ret < 0)
+			goto read_unlock;
+
+		break;
+	default:
+		ret = -EOPNOTSUPP;
+		goto read_unlock;
+	}
+
+	measurement = ret; /* If we came here ret holds the measurement position */
+
+	ret = mlx90632_read_ambient_raw(data->regmap, ambient_new_raw,
+					ambient_old_raw);
+	if (ret < 0)
+		goto read_unlock;
+
+	ret = mlx90632_read_object_raw(data->regmap, measurement,
+				       object_new_raw, object_old_raw);
+read_unlock:
+	mutex_unlock(&data->lock);
+	return ret;
+}
+
+static int mlx90632_read_ambient_raw_extended(struct regmap *regmap,
+					      s16 *ambient_new_raw, s16 *ambient_old_raw)
+{
+	unsigned int read_tmp;
+	int ret;
+
+	ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_AMBIENT_1, &read_tmp);
+	if (ret < 0)
+		return ret;
+	*ambient_new_raw = (s16)read_tmp;
+
+	ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_AMBIENT_2, &read_tmp);
+	if (ret < 0)
+		return ret;
+	*ambient_old_raw = (s16)read_tmp;
+
+	return 0;
+}
+
+static int mlx90632_read_object_raw_extended(struct regmap *regmap, s16 *object_new_raw)
+{
+	unsigned int read_tmp;
+	s32 read;
+	int ret;
+
+	ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_1, &read_tmp);
+	if (ret < 0)
+		return ret;
+	read = (s16)read_tmp;
+
+	ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_2, &read_tmp);
+	if (ret < 0)
+		return ret;
+	read = read - (s16)read_tmp;
+
+	ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_3, &read_tmp);
+	if (ret < 0)
+		return ret;
+	read = read - (s16)read_tmp;
+
+	ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_4, &read_tmp);
+	if (ret < 0)
+		return ret;
+	read = (read + (s16)read_tmp) / 2;
+
+	ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_5, &read_tmp);
+	if (ret < 0)
+		return ret;
+	read = read + (s16)read_tmp;
+
+	ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_6, &read_tmp);
+	if (ret < 0)
+		return ret;
+	read = read + (s16)read_tmp;
+
+	if (read > S16_MAX || read < S16_MIN)
+		return -ERANGE;
+
+	*object_new_raw = read;
+
+	return 0;
+}
+
+static int mlx90632_read_all_channel_extended(struct mlx90632_data *data, s16 *object_new_raw,
+					      s16 *ambient_new_raw, s16 *ambient_old_raw)
+{
+	s32 ret, meas;
+
+	mutex_lock(&data->lock);
+	ret = mlx90632_set_meas_type(data, MLX90632_MTYP_EXTENDED);
+	if (ret < 0)
+		goto read_unlock;
+
+	switch (data->powerstatus) {
+	case MLX90632_PWR_STATUS_CONTINUOUS:
+		ret = read_poll_timeout(mlx90632_perform_measurement, meas, meas == 19,
+					50000, 800000, false, data);
+		if (ret)
+			goto read_unlock;
+		break;
+	case MLX90632_PWR_STATUS_SLEEP_STEP:
+		ret = mlx90632_perform_measurement_burst(data);
+		if (ret < 0)
+			goto read_unlock;
+		break;
+	default:
+		ret = -EOPNOTSUPP;
+		goto read_unlock;
+	}
+
+	ret = mlx90632_read_object_raw_extended(data->regmap, object_new_raw);
+	if (ret < 0)
+		goto read_unlock;
+
+	ret = mlx90632_read_ambient_raw_extended(data->regmap, ambient_new_raw, ambient_old_raw);
+
+read_unlock:
+	mutex_unlock(&data->lock);
+	return ret;
+}
+
+static int mlx90632_read_ee_register(struct regmap *regmap, u16 reg_lsb,
+				     s32 *reg_value)
+{
+	unsigned int read;
+	u32 value;
+	int ret;
+
+	ret = regmap_read(regmap, reg_lsb, &read);
+	if (ret < 0)
+		return ret;
+
+	value = read;
+
+	ret = regmap_read(regmap, reg_lsb + 1, &read);
+	if (ret < 0)
+		return ret;
+
+	*reg_value = (read << 16) | (value & 0xffff);
+
+	return 0;
+}
+
+static s64 mlx90632_preprocess_temp_amb(s16 ambient_new_raw,
+					s16 ambient_old_raw, s16 Gb)
+{
+	s64 VR_Ta, kGb, tmp;
+
+	kGb = ((s64)Gb * 1000LL) >> 10ULL;
+	VR_Ta = (s64)ambient_old_raw * 1000000LL +
+		kGb * div64_s64(((s64)ambient_new_raw * 1000LL),
+			(MLX90632_REF_3));
+	tmp = div64_s64(
+			 div64_s64(((s64)ambient_new_raw * 1000000000000LL),
+				   (MLX90632_REF_3)), VR_Ta);
+	return div64_s64(tmp << 19ULL, 1000LL);
+}
+
+static s64 mlx90632_preprocess_temp_obj(s16 object_new_raw, s16 object_old_raw,
+					s16 ambient_new_raw,
+					s16 ambient_old_raw, s16 Ka)
+{
+	s64 VR_IR, kKa, tmp;
+
+	kKa = ((s64)Ka * 1000LL) >> 10ULL;
+	VR_IR = (s64)ambient_old_raw * 1000000LL +
+		kKa * div64_s64(((s64)ambient_new_raw * 1000LL),
+			(MLX90632_REF_3));
+	tmp = div64_s64(
+			div64_s64(((s64)((object_new_raw + object_old_raw) / 2)
+				   * 1000000000000LL), (MLX90632_REF_12)),
+			VR_IR);
+	return div64_s64((tmp << 19ULL), 1000LL);
+}
+
+static s64 mlx90632_preprocess_temp_obj_extended(s16 object_new_raw, s16 ambient_new_raw,
+						 s16 ambient_old_raw, s16 Ka)
+{
+	s64 VR_IR, kKa, tmp;
+
+	kKa = ((s64)Ka * 1000LL) >> 10ULL;
+	VR_IR = (s64)ambient_old_raw * 1000000LL +
+		kKa * div64_s64((s64)ambient_new_raw * 1000LL,
+				MLX90632_REF_3);
+	tmp = div64_s64(
+			div64_s64((s64) object_new_raw * 1000000000000LL, MLX90632_REF_12),
+			VR_IR);
+	return div64_s64(tmp << 19ULL, 1000LL);
+}
+
+static s32 mlx90632_calc_temp_ambient(s16 ambient_new_raw, s16 ambient_old_raw,
+				      s32 P_T, s32 P_R, s32 P_G, s32 P_O, s16 Gb)
+{
+	s64 Asub, Bsub, Ablock, Bblock, Cblock, AMB, sum;
+
+	AMB = mlx90632_preprocess_temp_amb(ambient_new_raw, ambient_old_raw,
+					   Gb);
+	Asub = ((s64)P_T * 10000000000LL) >> 44ULL;
+	Bsub = AMB - (((s64)P_R * 1000LL) >> 8ULL);
+	Ablock = Asub * (Bsub * Bsub);
+	Bblock = (div64_s64(Bsub * 10000000LL, P_G)) << 20ULL;
+	Cblock = ((s64)P_O * 10000000000LL) >> 8ULL;
+
+	sum = div64_s64(Ablock, 1000000LL) + Bblock + Cblock;
+
+	return div64_s64(sum, 10000000LL);
+}
+
+static s32 mlx90632_calc_temp_object_iteration(s32 prev_object_temp, s64 object,
+					       s64 TAdut, s64 TAdut4, s32 Fa, s32 Fb,
+					       s32 Ga, s16 Ha, s16 Hb,
+					       u16 emissivity)
+{
+	s64 calcedKsTO, calcedKsTA, ir_Alpha, Alpha_corr;
+	s64 Ha_customer, Hb_customer;
+
+	Ha_customer = ((s64)Ha * 1000000LL) >> 14ULL;
+	Hb_customer = ((s64)Hb * 100) >> 10ULL;
+
+	calcedKsTO = ((s64)((s64)Ga * (prev_object_temp - 25 * 1000LL)
+			     * 1000LL)) >> 36LL;
+	calcedKsTA = ((s64)(Fb * (TAdut - 25 * 1000000LL))) >> 36LL;
+	Alpha_corr = div64_s64((((s64)(Fa * 10000000000LL) >> 46LL)
+				* Ha_customer), 1000LL);
+	Alpha_corr *= ((s64)(1 * 1000000LL + calcedKsTO + calcedKsTA));
+	Alpha_corr = emissivity * div64_s64(Alpha_corr, 100000LL);
+	Alpha_corr = div64_s64(Alpha_corr, 1000LL);
+	ir_Alpha = div64_s64((s64)object * 10000000LL, Alpha_corr);
+
+	return (int_sqrt64(int_sqrt64(ir_Alpha * 1000000000000LL + TAdut4))
+		- 27315 - Hb_customer) * 10;
+}
+
+static s64 mlx90632_calc_ta4(s64 TAdut, s64 scale)
+{
+	return (div64_s64(TAdut, scale) + 27315) *
+		(div64_s64(TAdut, scale) + 27315) *
+		(div64_s64(TAdut, scale) + 27315) *
+		(div64_s64(TAdut, scale) + 27315);
+}
+
+static s32 mlx90632_calc_temp_object(s64 object, s64 ambient, s32 Ea, s32 Eb,
+				     s32 Fa, s32 Fb, s32 Ga, s16 Ha, s16 Hb,
+				     u16 tmp_emi)
+{
+	s64 kTA, kTA0, TAdut, TAdut4;
+	s64 temp = 25000;
+	s8 i;
+
+	kTA = (Ea * 1000LL) >> 16LL;
+	kTA0 = (Eb * 1000LL) >> 8LL;
+	TAdut = div64_s64(((ambient - kTA0) * 1000000LL), kTA) + 25 * 1000000LL;
+	TAdut4 = mlx90632_calc_ta4(TAdut, 10000LL);
+
+	/* Iterations of calculation as described in datasheet */
+	for (i = 0; i < 5; ++i) {
+		temp = mlx90632_calc_temp_object_iteration(temp, object, TAdut, TAdut4,
+							   Fa, Fb, Ga, Ha, Hb,
+							   tmp_emi);
+	}
+	return temp;
+}
+
+static s32 mlx90632_calc_temp_object_extended(s64 object, s64 ambient, s64 reflected,
+					      s32 Ea, s32 Eb, s32 Fa, s32 Fb, s32 Ga,
+					      s16 Ha, s16 Hb, u16 tmp_emi)
+{
+	s64 kTA, kTA0, TAdut, TAdut4, Tr4, TaTr4;
+	s64 temp = 25000;
+	s8 i;
+
+	kTA = (Ea * 1000LL) >> 16LL;
+	kTA0 = (Eb * 1000LL) >> 8LL;
+	TAdut = div64_s64((ambient - kTA0) * 1000000LL, kTA) + 25 * 1000000LL;
+	Tr4 = mlx90632_calc_ta4(reflected, 10);
+	TAdut4 = mlx90632_calc_ta4(TAdut, 10000LL);
+	TaTr4 = Tr4 - div64_s64(Tr4 - TAdut4, tmp_emi) * 1000;
+
+	/* Iterations of calculation as described in datasheet */
+	for (i = 0; i < 5; ++i) {
+		temp = mlx90632_calc_temp_object_iteration(temp, object, TAdut, TaTr4,
+							   Fa / 2, Fb, Ga, Ha, Hb,
+							   tmp_emi);
+	}
+
+	return temp;
+}
+
+static int mlx90632_calc_object_dsp105(struct mlx90632_data *data, int *val)
+{
+	s16 ambient_new_raw, ambient_old_raw, object_new_raw, object_old_raw;
+	s32 Ea, Eb, Fa, Fb, Ga;
+	unsigned int read_tmp;
+	s64 object, ambient;
+	s16 Ha, Hb, Gb, Ka;
+	int ret;
+
+	ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Ea, &Ea);
+	if (ret < 0)
+		return ret;
+	ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Eb, &Eb);
+	if (ret < 0)
+		return ret;
+	ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Fa, &Fa);
+	if (ret < 0)
+		return ret;
+	ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Fb, &Fb);
+	if (ret < 0)
+		return ret;
+	ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Ga, &Ga);
+	if (ret < 0)
+		return ret;
+	ret = regmap_read(data->regmap, MLX90632_EE_Ha, &read_tmp);
+	if (ret < 0)
+		return ret;
+	Ha = (s16)read_tmp;
+	ret = regmap_read(data->regmap, MLX90632_EE_Hb, &read_tmp);
+	if (ret < 0)
+		return ret;
+	Hb = (s16)read_tmp;
+	ret = regmap_read(data->regmap, MLX90632_EE_Gb, &read_tmp);
+	if (ret < 0)
+		return ret;
+	Gb = (s16)read_tmp;
+	ret = regmap_read(data->regmap, MLX90632_EE_Ka, &read_tmp);
+	if (ret < 0)
+		return ret;
+	Ka = (s16)read_tmp;
+
+	ret = mlx90632_read_all_channel(data,
+					&ambient_new_raw, &ambient_old_raw,
+					&object_new_raw, &object_old_raw);
+	if (ret < 0)
+		return ret;
+
+	if (object_new_raw > MLX90632_EXTENDED_LIMIT &&
+	    data->mtyp == MLX90632_MTYP_EXTENDED) {
+		ret = mlx90632_read_all_channel_extended(data, &object_new_raw,
+							 &ambient_new_raw, &ambient_old_raw);
+		if (ret < 0)
+			return ret;
+
+		/* Use extended mode calculations */
+		ambient = mlx90632_preprocess_temp_amb(ambient_new_raw,
+						       ambient_old_raw, Gb);
+		object = mlx90632_preprocess_temp_obj_extended(object_new_raw,
+							       ambient_new_raw,
+							       ambient_old_raw, Ka);
+		*val = mlx90632_calc_temp_object_extended(object, ambient,
+							  data->object_ambient_temperature,
+							  Ea, Eb, Fa, Fb, Ga,
+							  Ha, Hb, data->emissivity);
+		return 0;
+	}
+
+	ambient = mlx90632_preprocess_temp_amb(ambient_new_raw,
+					       ambient_old_raw, Gb);
+	object = mlx90632_preprocess_temp_obj(object_new_raw,
+					      object_old_raw,
+					      ambient_new_raw,
+					      ambient_old_raw, Ka);
+
+	*val = mlx90632_calc_temp_object(object, ambient, Ea, Eb, Fa, Fb, Ga,
+					 Ha, Hb, data->emissivity);
+	return 0;
+}
+
+static int mlx90632_calc_ambient_dsp105(struct mlx90632_data *data, int *val)
+{
+	s16 ambient_new_raw, ambient_old_raw;
+	unsigned int read_tmp;
+	s32 PT, PR, PG, PO;
+	int ret;
+	s16 Gb;
+
+	ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_R, &PR);
+	if (ret < 0)
+		return ret;
+	ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_G, &PG);
+	if (ret < 0)
+		return ret;
+	ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_T, &PT);
+	if (ret < 0)
+		return ret;
+	ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_O, &PO);
+	if (ret < 0)
+		return ret;
+	ret = regmap_read(data->regmap, MLX90632_EE_Gb, &read_tmp);
+	if (ret < 0)
+		return ret;
+	Gb = (s16)read_tmp;
+
+	ret = mlx90632_read_ambient_raw(data->regmap, &ambient_new_raw,
+					&ambient_old_raw);
+	if (ret < 0)
+		return ret;
+	*val = mlx90632_calc_temp_ambient(ambient_new_raw, ambient_old_raw,
+					  PT, PR, PG, PO, Gb);
+	return ret;
+}
+
+static int mlx90632_get_refresh_rate(struct mlx90632_data *data,
+				     int *refresh_rate)
+{
+	unsigned int meas1;
+	int ret;
+
+	ret = regmap_read(data->regmap, MLX90632_EE_MEDICAL_MEAS1, &meas1);
+	if (ret < 0)
+		return ret;
+
+	*refresh_rate = MLX90632_REFRESH_RATE(meas1);
+
+	return ret;
+}
+
+static const int mlx90632_freqs[][2] = {
+	{0, 500000},
+	{1, 0},
+	{2, 0},
+	{4, 0},
+	{8, 0},
+	{16, 0},
+	{32, 0},
+	{64, 0}
+};
+
+/**
+ * mlx90632_pm_interraction_wakeup() - Measure time between user interactions to change powermode
+ * @data: pointer to mlx90632_data object containing interaction_ts information
+ *
+ * Switch to continuous mode when interaction is faster than MLX90632_MEAS_MAX_TIME. Update the
+ * interaction_ts for each function call with the jiffies to enable measurement between function
+ * calls. Initial value of the interaction_ts needs to be set before this function call.
+ */
+static int mlx90632_pm_interraction_wakeup(struct mlx90632_data *data)
+{
+	unsigned long now;
+	int ret;
+
+	now = jiffies;
+	if (time_in_range(now, data->interaction_ts,
+			  data->interaction_ts +
+			  msecs_to_jiffies(MLX90632_MEAS_MAX_TIME + 100))) {
+		if (data->powerstatus == MLX90632_PWR_STATUS_SLEEP_STEP) {
+			ret = mlx90632_pwr_continuous(data->regmap);
+			if (ret < 0)
+				return ret;
+		}
+	}
+
+	data->interaction_ts = now;
+
+	return 0;
+}
+
+static int mlx90632_read_raw(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *channel, int *val,
+			     int *val2, long mask)
+{
+	struct mlx90632_data *data = iio_priv(indio_dev);
+	int ret;
+	int cr;
+
+	pm_runtime_get_sync(&data->client->dev);
+	ret = mlx90632_pm_interraction_wakeup(data);
+	if (ret < 0)
+		goto mlx90632_read_raw_pm;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_PROCESSED:
+		switch (channel->channel2) {
+		case IIO_MOD_TEMP_AMBIENT:
+			ret = mlx90632_calc_ambient_dsp105(data, val);
+			if (ret < 0)
+				goto mlx90632_read_raw_pm;
+
+			ret = IIO_VAL_INT;
+			break;
+		case IIO_MOD_TEMP_OBJECT:
+			ret = mlx90632_calc_object_dsp105(data, val);
+			if (ret < 0)
+				goto mlx90632_read_raw_pm;
+
+			ret = IIO_VAL_INT;
+			break;
+		default:
+			ret = -EINVAL;
+			break;
+		}
+		break;
+	case IIO_CHAN_INFO_CALIBEMISSIVITY:
+		if (data->emissivity == 1000) {
+			*val = 1;
+			*val2 = 0;
+		} else {
+			*val = 0;
+			*val2 = data->emissivity * 1000;
+		}
+		ret = IIO_VAL_INT_PLUS_MICRO;
+		break;
+	case IIO_CHAN_INFO_CALIBAMBIENT:
+		*val = data->object_ambient_temperature;
+		ret = IIO_VAL_INT;
+		break;
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		ret = mlx90632_get_refresh_rate(data, &cr);
+		if (ret < 0)
+			goto mlx90632_read_raw_pm;
+
+		*val = mlx90632_freqs[cr][0];
+		*val2 = mlx90632_freqs[cr][1];
+		ret = IIO_VAL_INT_PLUS_MICRO;
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+mlx90632_read_raw_pm:
+	pm_runtime_put_autosuspend(&data->client->dev);
+	return ret;
+}
+
+static int mlx90632_write_raw(struct iio_dev *indio_dev,
+			      struct iio_chan_spec const *channel, int val,
+			      int val2, long mask)
+{
+	struct mlx90632_data *data = iio_priv(indio_dev);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_CALIBEMISSIVITY:
+		/* Confirm we are within 0 and 1.0 */
+		if (val < 0 || val2 < 0 || val > 1 ||
+		    (val == 1 && val2 != 0))
+			return -EINVAL;
+		data->emissivity = val * 1000 + val2 / 1000;
+		return 0;
+	case IIO_CHAN_INFO_CALIBAMBIENT:
+		data->object_ambient_temperature = val;
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int mlx90632_read_avail(struct iio_dev *indio_dev,
+			       struct iio_chan_spec const *chan,
+			       const int **vals, int *type, int *length,
+			       long mask)
+{
+	switch (mask) {
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		*vals = (int *)mlx90632_freqs;
+		*type = IIO_VAL_INT_PLUS_MICRO;
+		*length = 2 * ARRAY_SIZE(mlx90632_freqs);
+		return IIO_AVAIL_LIST;
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct iio_chan_spec mlx90632_channels[] = {
+	{
+		.type = IIO_TEMP,
+		.modified = 1,
+		.channel2 = IIO_MOD_TEMP_AMBIENT,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+		.info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+	},
+	{
+		.type = IIO_TEMP,
+		.modified = 1,
+		.channel2 = IIO_MOD_TEMP_OBJECT,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
+			BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) | BIT(IIO_CHAN_INFO_CALIBAMBIENT),
+		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+		.info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+	},
+};
+
+static const struct iio_info mlx90632_info = {
+	.read_raw = mlx90632_read_raw,
+	.write_raw = mlx90632_write_raw,
+	.read_avail = mlx90632_read_avail,
+};
+
+static void mlx90632_sleep(void *_data)
+{
+	struct mlx90632_data *data = _data;
+
+	mlx90632_pwr_set_sleep_step(data->regmap);
+}
+
+static int mlx90632_suspend(struct mlx90632_data *data)
+{
+	regcache_mark_dirty(data->regmap);
+
+	dev_dbg(&data->client->dev, "Requesting suspend");
+	return mlx90632_pwr_set_sleep_step(data->regmap);
+}
+
+static int mlx90632_wakeup(struct mlx90632_data *data)
+{
+	int ret;
+
+	ret = regcache_sync(data->regmap);
+	if (ret < 0) {
+		dev_err(&data->client->dev,
+			"Failed to sync regmap registers: %d\n", ret);
+		return ret;
+	}
+
+	dev_dbg(&data->client->dev, "Requesting wake-up\n");
+	return mlx90632_pwr_continuous(data->regmap);
+}
+
+static void mlx90632_disable_regulator(void *_data)
+{
+	struct mlx90632_data *data = _data;
+	int ret;
+
+	ret = regulator_disable(data->regulator);
+	if (ret < 0)
+		dev_err(regmap_get_device(data->regmap),
+			"Failed to disable power regulator: %d\n", ret);
+}
+
+static int mlx90632_enable_regulator(struct mlx90632_data *data)
+{
+	int ret;
+
+	ret = regulator_enable(data->regulator);
+	if (ret < 0) {
+		dev_err(regmap_get_device(data->regmap), "Failed to enable power regulator!\n");
+		return ret;
+	}
+
+	mlx90632_reset_delay();
+
+	return ret;
+}
+
+static int mlx90632_probe(struct i2c_client *client)
+{
+	const struct i2c_device_id *id = i2c_client_get_device_id(client);
+	struct mlx90632_data *mlx90632;
+	struct iio_dev *indio_dev;
+	struct regmap *regmap;
+	unsigned int read;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*mlx90632));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	regmap = devm_regmap_init_i2c(client, &mlx90632_regmap);
+	if (IS_ERR(regmap)) {
+		ret = PTR_ERR(regmap);
+		dev_err(&client->dev, "Failed to allocate regmap: %d\n", ret);
+		return ret;
+	}
+
+	mlx90632 = iio_priv(indio_dev);
+	i2c_set_clientdata(client, indio_dev);
+	mlx90632->client = client;
+	mlx90632->regmap = regmap;
+	mlx90632->mtyp = MLX90632_MTYP_MEDICAL;
+	mlx90632->powerstatus = MLX90632_PWR_STATUS_HALT;
+
+	mutex_init(&mlx90632->lock);
+	indio_dev->name = id->name;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->info = &mlx90632_info;
+	indio_dev->channels = mlx90632_channels;
+	indio_dev->num_channels = ARRAY_SIZE(mlx90632_channels);
+
+	mlx90632->regulator = devm_regulator_get(&client->dev, "vdd");
+	if (IS_ERR(mlx90632->regulator))
+		return dev_err_probe(&client->dev, PTR_ERR(mlx90632->regulator),
+				     "failed to get vdd regulator");
+
+	ret = mlx90632_enable_regulator(mlx90632);
+	if (ret < 0)
+		return ret;
+
+	ret = devm_add_action_or_reset(&client->dev, mlx90632_disable_regulator,
+				       mlx90632);
+	if (ret < 0) {
+		dev_err(&client->dev, "Failed to setup regulator cleanup action %d\n",
+			ret);
+		return ret;
+	}
+
+	ret = mlx90632_wakeup(mlx90632);
+	if (ret < 0) {
+		dev_err(&client->dev, "Wakeup failed: %d\n", ret);
+		return ret;
+	}
+
+	ret = devm_add_action_or_reset(&client->dev, mlx90632_sleep, mlx90632);
+	if (ret < 0) {
+		dev_err(&client->dev, "Failed to setup low power cleanup action %d\n",
+			ret);
+		return ret;
+	}
+
+	ret = regmap_read(mlx90632->regmap, MLX90632_EE_VERSION, &read);
+	if (ret < 0) {
+		dev_err(&client->dev, "read of version failed: %d\n", ret);
+		return ret;
+	}
+	read = read & MLX90632_ID_MASK;
+	if (read == MLX90632_ID_MEDICAL) {
+		dev_dbg(&client->dev,
+			"Detected Medical EEPROM calibration %x\n", read);
+	} else if (read == MLX90632_ID_CONSUMER) {
+		dev_dbg(&client->dev,
+			"Detected Consumer EEPROM calibration %x\n", read);
+	} else if (read == MLX90632_ID_EXTENDED) {
+		dev_dbg(&client->dev,
+			"Detected Extended range EEPROM calibration %x\n", read);
+		mlx90632->mtyp = MLX90632_MTYP_EXTENDED;
+	} else if ((read & MLX90632_DSP_MASK) == MLX90632_DSP_VERSION) {
+		dev_dbg(&client->dev,
+			"Detected Unknown EEPROM calibration %x\n", read);
+	} else {
+		dev_err(&client->dev,
+			"Wrong DSP version %x (expected %x)\n",
+			read, MLX90632_DSP_VERSION);
+		return -EPROTONOSUPPORT;
+	}
+
+	mlx90632->emissivity = 1000;
+	mlx90632->object_ambient_temperature = 25000; /* 25 degrees milliCelsius */
+	mlx90632->interaction_ts = jiffies; /* Set initial value */
+
+	pm_runtime_get_noresume(&client->dev);
+	pm_runtime_set_active(&client->dev);
+
+	ret = devm_pm_runtime_enable(&client->dev);
+	if (ret)
+		return ret;
+
+	pm_runtime_set_autosuspend_delay(&client->dev, MLX90632_SLEEP_DELAY_MS);
+	pm_runtime_use_autosuspend(&client->dev);
+	pm_runtime_put_autosuspend(&client->dev);
+
+	return devm_iio_device_register(&client->dev, indio_dev);
+}
+
+static const struct i2c_device_id mlx90632_id[] = {
+	{ .name = "mlx90632" },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, mlx90632_id);
+
+static const struct of_device_id mlx90632_of_match[] = {
+	{ .compatible = "melexis,mlx90632" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, mlx90632_of_match);
+
+static int mlx90632_pm_suspend(struct device *dev)
+{
+	struct mlx90632_data *data = iio_priv(dev_get_drvdata(dev));
+	int ret;
+
+	ret = mlx90632_suspend(data);
+	if (ret < 0)
+		return ret;
+
+	ret = regulator_disable(data->regulator);
+	if (ret < 0)
+		dev_err(regmap_get_device(data->regmap),
+			"Failed to disable power regulator: %d\n", ret);
+
+	return ret;
+}
+
+static int mlx90632_pm_resume(struct device *dev)
+{
+	struct mlx90632_data *data = iio_priv(dev_get_drvdata(dev));
+	int ret;
+
+	ret = mlx90632_enable_regulator(data);
+	if (ret < 0)
+		return ret;
+
+	return mlx90632_wakeup(data);
+}
+
+static int mlx90632_pm_runtime_suspend(struct device *dev)
+{
+	struct mlx90632_data *data = iio_priv(dev_get_drvdata(dev));
+
+	return mlx90632_pwr_set_sleep_step(data->regmap);
+}
+
+static const struct dev_pm_ops mlx90632_pm_ops = {
+	SYSTEM_SLEEP_PM_OPS(mlx90632_pm_suspend, mlx90632_pm_resume)
+	RUNTIME_PM_OPS(mlx90632_pm_runtime_suspend, NULL, NULL)
+};
+
+static struct i2c_driver mlx90632_driver = {
+	.driver = {
+		.name	= "mlx90632",
+		.of_match_table = mlx90632_of_match,
+		.pm	= pm_ptr(&mlx90632_pm_ops),
+	},
+	.probe = mlx90632_probe,
+	.id_table = mlx90632_id,
+};
+module_i2c_driver(mlx90632_driver);
+
+MODULE_AUTHOR("Crt Mori <cmo@melexis.com>");
+MODULE_DESCRIPTION("Melexis MLX90632 contactless Infra Red temperature sensor driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/temperature/mlx90635.c b/drivers/iio/temperature/mlx90635.c
new file mode 100644
index 000000000..0f31879a4
--- /dev/null
+++ b/drivers/iio/temperature/mlx90635.c
@@ -0,0 +1,1093 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * mlx90635.c - Melexis MLX90635 contactless IR temperature sensor
+ *
+ * Copyright (c) 2023 Melexis <cmo@melexis.com>
+ *
+ * Driver for the Melexis MLX90635 I2C 16-bit IR thermopile sensor
+ */
+#include <linux/bitfield.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/iopoll.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/limits.h>
+#include <linux/module.h>
+#include <linux/math64.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+
+#include <linux/iio/iio.h>
+
+/* Memory sections addresses */
+#define MLX90635_ADDR_RAM	0x0000 /* Start address of ram */
+#define MLX90635_ADDR_EEPROM	0x0018 /* Start address of user eeprom */
+
+/* EEPROM addresses - used at startup */
+#define MLX90635_EE_I2C_CFG	0x0018 /* I2C address register initial value */
+#define MLX90635_EE_CTRL1	0x001A /* Control register1 initial value */
+#define MLX90635_EE_CTRL2	0x001C /* Control register2 initial value */
+
+#define MLX90635_EE_Ha		0x001E /* Ha customer calib value reg 16bit */
+#define MLX90635_EE_Hb		0x0020 /* Hb customer calib value reg 16bit */
+#define MLX90635_EE_Fa		0x0026 /* Fa calibration register 32bit */
+#define MLX90635_EE_FASCALE	0x002A /* Scaling coefficient for Fa register 16bit */
+#define MLX90635_EE_Ga		0x002C /* Ga calibration register 16bit */
+#define MLX90635_EE_Fb		0x002E /* Fb calibration register 16bit */
+#define MLX90635_EE_Ea		0x0030 /* Ea calibration register 32bit */
+#define MLX90635_EE_Eb		0x0034 /* Eb calibration register 32bit */
+#define MLX90635_EE_P_G		0x0038 /* P_G calibration register 16bit */
+#define MLX90635_EE_P_O		0x003A /* P_O calibration register 16bit */
+#define MLX90635_EE_Aa		0x003C /* Aa calibration register 16bit */
+#define MLX90635_EE_VERSION	0x003E /* Version bits 4:7 and 12:15 */
+#define MLX90635_EE_Gb		0x0040 /* Gb calibration register 16bit */
+
+/* Device status register - volatile */
+#define MLX90635_REG_STATUS	0x0000
+#define   MLX90635_STAT_BUSY BIT(6) /* Device busy indicator */
+#define   MLX90635_STAT_BRST BIT(5) /* Brown out reset indicator */
+#define   MLX90635_STAT_CYCLE_POS GENMASK(4, 2) /* Data position */
+#define   MLX90635_STAT_END_CONV BIT(1) /* End of conversion indicator */
+#define   MLX90635_STAT_DATA_RDY BIT(0) /* Data ready indicator */
+
+/* EEPROM control register address - volatile */
+#define MLX90635_REG_EE		0x000C
+#define   MLX90635_EE_ACTIVE BIT(4) /* Power-on EEPROM */
+#define   MLX90635_EE_BUSY_MASK	BIT(15)
+
+#define MLX90635_REG_CMD	0x0010 /* Command register address */
+
+/* Control register1 address - volatile */
+#define MLX90635_REG_CTRL1	0x0014
+#define   MLX90635_CTRL1_REFRESH_RATE_MASK GENMASK(2, 0)
+#define   MLX90635_CTRL1_RES_CTRL_MASK GENMASK(4, 3)
+#define   MLX90635_CTRL1_TABLE_MASK BIT(15) /* Table select */
+
+/* Control register2 address - volatile */
+#define   MLX90635_REG_CTRL2	0x0016
+#define   MLX90635_CTRL2_BURST_CNT_MASK GENMASK(10, 6) /* Burst count */
+#define   MLX90635_CTRL2_MODE_MASK GENMASK(12, 11) /* Power mode */
+#define   MLX90635_CTRL2_SOB_MASK BIT(15)
+
+/* PowerModes statuses */
+#define MLX90635_PWR_STATUS_HALT 0
+#define MLX90635_PWR_STATUS_SLEEP_STEP 1
+#define MLX90635_PWR_STATUS_STEP 2
+#define MLX90635_PWR_STATUS_CONTINUOUS 3
+
+/* Measurement data addresses */
+#define MLX90635_RESULT_1   0x0002
+#define MLX90635_RESULT_2   0x0004
+#define MLX90635_RESULT_3   0x0006
+#define MLX90635_RESULT_4   0x0008
+#define MLX90635_RESULT_5   0x000A
+
+/* Timings (ms) */
+#define MLX90635_TIMING_RST_MIN 200 /* Minimum time after addressed reset command */
+#define MLX90635_TIMING_RST_MAX 250 /* Maximum time after addressed reset command */
+#define MLX90635_TIMING_POLLING 10000 /* Time between bit polling*/
+#define MLX90635_TIMING_EE_ACTIVE_MIN 100 /* Minimum time after activating the EEPROM for read */
+#define MLX90635_TIMING_EE_ACTIVE_MAX 150 /* Maximum time after activating the EEPROM for read */
+
+/* Magic constants */
+#define MLX90635_ID_DSPv1 0x01 /* EEPROM DSP version */
+#define MLX90635_RESET_CMD  0x0006 /* Reset sensor (address or global) */
+#define MLX90635_MAX_MEAS_NUM   31 /* Maximum number of measurements in list */
+#define MLX90635_PTAT_DIV 12   /* Used to divide the PTAT value in pre-processing */
+#define MLX90635_IR_DIV 24   /* Used to divide the IR value in pre-processing */
+#define MLX90635_SLEEP_DELAY_MS 6000 /* Autosleep delay */
+#define MLX90635_MEAS_MAX_TIME 2000 /* Max measurement time in ms for the lowest refresh rate */
+#define MLX90635_READ_RETRIES 100 /* Number of read retries before quitting with timeout error */
+#define MLX90635_VERSION_MASK (GENMASK(15, 12) | GENMASK(7, 4))
+#define MLX90635_DSP_VERSION(reg) (((reg & GENMASK(14, 12)) >> 9) | ((reg & GENMASK(6, 4)) >> 4))
+#define MLX90635_DSP_FIXED BIT(15)
+
+
+/**
+ * struct mlx90635_data - private data for the MLX90635 device
+ * @client: I2C client of the device
+ * @lock: Internal mutex because multiple reads are needed for single triggered
+ *	  measurement to ensure data consistency
+ * @regmap: Regmap of the device registers
+ * @regmap_ee: Regmap of the device EEPROM which can be cached
+ * @emissivity: Object emissivity from 0 to 1000 where 1000 = 1
+ * @regulator: Regulator of the device
+ * @powerstatus: Current POWER status of the device
+ * @interaction_ts: Timestamp of the last temperature read that is used
+ *		    for power management in jiffies
+ */
+struct mlx90635_data {
+	struct i2c_client *client;
+	struct mutex lock;
+	struct regmap *regmap;
+	struct regmap *regmap_ee;
+	u16 emissivity;
+	struct regulator *regulator;
+	int powerstatus;
+	unsigned long interaction_ts;
+};
+
+static const struct regmap_range mlx90635_volatile_reg_range[] = {
+	regmap_reg_range(MLX90635_REG_STATUS, MLX90635_REG_STATUS),
+	regmap_reg_range(MLX90635_RESULT_1, MLX90635_RESULT_5),
+	regmap_reg_range(MLX90635_REG_EE, MLX90635_REG_EE),
+	regmap_reg_range(MLX90635_REG_CMD, MLX90635_REG_CMD),
+	regmap_reg_range(MLX90635_REG_CTRL1, MLX90635_REG_CTRL2),
+};
+
+static const struct regmap_access_table mlx90635_volatile_regs_tbl = {
+	.yes_ranges = mlx90635_volatile_reg_range,
+	.n_yes_ranges = ARRAY_SIZE(mlx90635_volatile_reg_range),
+};
+
+static const struct regmap_range mlx90635_read_reg_range[] = {
+	regmap_reg_range(MLX90635_REG_STATUS, MLX90635_REG_STATUS),
+	regmap_reg_range(MLX90635_RESULT_1, MLX90635_RESULT_5),
+	regmap_reg_range(MLX90635_REG_EE, MLX90635_REG_EE),
+	regmap_reg_range(MLX90635_REG_CMD, MLX90635_REG_CMD),
+	regmap_reg_range(MLX90635_REG_CTRL1, MLX90635_REG_CTRL2),
+};
+
+static const struct regmap_access_table mlx90635_readable_regs_tbl = {
+	.yes_ranges = mlx90635_read_reg_range,
+	.n_yes_ranges = ARRAY_SIZE(mlx90635_read_reg_range),
+};
+
+static const struct regmap_range mlx90635_no_write_reg_range[] = {
+	regmap_reg_range(MLX90635_RESULT_1, MLX90635_RESULT_5),
+};
+
+static const struct regmap_access_table mlx90635_writeable_regs_tbl = {
+	.no_ranges = mlx90635_no_write_reg_range,
+	.n_no_ranges = ARRAY_SIZE(mlx90635_no_write_reg_range),
+};
+
+static const struct regmap_config mlx90635_regmap = {
+	.name = "mlx90635-registers",
+	.reg_stride = 1,
+	.reg_bits = 16,
+	.val_bits = 16,
+
+	.volatile_table = &mlx90635_volatile_regs_tbl,
+	.rd_table = &mlx90635_readable_regs_tbl,
+	.wr_table = &mlx90635_writeable_regs_tbl,
+
+	.use_single_read = true,
+	.use_single_write = true,
+	.can_multi_write = false,
+	.reg_format_endian = REGMAP_ENDIAN_BIG,
+	.val_format_endian = REGMAP_ENDIAN_BIG,
+	.cache_type = REGCACHE_RBTREE,
+};
+
+static const struct regmap_range mlx90635_read_ee_range[] = {
+	regmap_reg_range(MLX90635_EE_I2C_CFG, MLX90635_EE_CTRL2),
+	regmap_reg_range(MLX90635_EE_Ha, MLX90635_EE_Gb),
+};
+
+static const struct regmap_access_table mlx90635_readable_ees_tbl = {
+	.yes_ranges = mlx90635_read_ee_range,
+	.n_yes_ranges = ARRAY_SIZE(mlx90635_read_ee_range),
+};
+
+static const struct regmap_range mlx90635_no_write_ee_range[] = {
+	regmap_reg_range(MLX90635_ADDR_EEPROM, MLX90635_EE_Gb),
+};
+
+static const struct regmap_access_table mlx90635_writeable_ees_tbl = {
+	.no_ranges = mlx90635_no_write_ee_range,
+	.n_no_ranges = ARRAY_SIZE(mlx90635_no_write_ee_range),
+};
+
+static const struct regmap_config mlx90635_regmap_ee = {
+	.name = "mlx90635-eeprom",
+	.reg_stride = 1,
+	.reg_bits = 16,
+	.val_bits = 16,
+
+	.volatile_table = NULL,
+	.rd_table = &mlx90635_readable_ees_tbl,
+	.wr_table = &mlx90635_writeable_ees_tbl,
+
+	.use_single_read = true,
+	.use_single_write = true,
+	.can_multi_write = false,
+	.reg_format_endian = REGMAP_ENDIAN_BIG,
+	.val_format_endian = REGMAP_ENDIAN_BIG,
+	.cache_type = REGCACHE_RBTREE,
+};
+
+/**
+ * mlx90635_reset_delay() - Give the mlx90635 some time to reset properly
+ * If this is not done, the following I2C command(s) will not be accepted.
+ */
+static void mlx90635_reset_delay(void)
+{
+	usleep_range(MLX90635_TIMING_RST_MIN, MLX90635_TIMING_RST_MAX);
+}
+
+static int mlx90635_pwr_sleep_step(struct mlx90635_data *data)
+{
+	int ret;
+
+	if (data->powerstatus == MLX90635_PWR_STATUS_SLEEP_STEP)
+		return 0;
+
+	ret = regmap_write_bits(data->regmap, MLX90635_REG_CTRL2, MLX90635_CTRL2_MODE_MASK,
+				FIELD_PREP(MLX90635_CTRL2_MODE_MASK, MLX90635_PWR_STATUS_SLEEP_STEP));
+	if (ret < 0)
+		return ret;
+
+	data->powerstatus = MLX90635_PWR_STATUS_SLEEP_STEP;
+	return 0;
+}
+
+static int mlx90635_pwr_continuous(struct mlx90635_data *data)
+{
+	int ret;
+
+	if (data->powerstatus == MLX90635_PWR_STATUS_CONTINUOUS)
+		return 0;
+
+	ret = regmap_write_bits(data->regmap, MLX90635_REG_CTRL2, MLX90635_CTRL2_MODE_MASK,
+				FIELD_PREP(MLX90635_CTRL2_MODE_MASK, MLX90635_PWR_STATUS_CONTINUOUS));
+	if (ret < 0)
+		return ret;
+
+	data->powerstatus = MLX90635_PWR_STATUS_CONTINUOUS;
+	return 0;
+}
+
+static int mlx90635_read_ee_register(struct regmap *regmap, u16 reg_lsb,
+				     s32 *reg_value)
+{
+	unsigned int read;
+	u32 value;
+	int ret;
+
+	ret = regmap_read(regmap, reg_lsb + 2, &read);
+	if (ret < 0)
+		return ret;
+
+	value = read;
+
+	ret = regmap_read(regmap, reg_lsb, &read);
+	if (ret < 0)
+		return ret;
+
+	*reg_value = (read << 16) | (value & 0xffff);
+
+	return 0;
+}
+
+static int mlx90635_read_ee_ambient(struct regmap *regmap, s16 *PG, s16 *PO, s16 *Gb)
+{
+	unsigned int read_tmp;
+	int ret;
+
+	ret = regmap_read(regmap, MLX90635_EE_P_O, &read_tmp);
+	if (ret < 0)
+		return ret;
+	*PO = (s16)read_tmp;
+
+	ret = regmap_read(regmap, MLX90635_EE_P_G, &read_tmp);
+	if (ret < 0)
+		return ret;
+	*PG = (s16)read_tmp;
+
+	ret = regmap_read(regmap, MLX90635_EE_Gb, &read_tmp);
+	if (ret < 0)
+		return ret;
+	*Gb = (u16)read_tmp;
+
+	return 0;
+}
+
+static int mlx90635_read_ee_object(struct regmap *regmap, u32 *Ea, u32 *Eb, u32 *Fa, s16 *Fb,
+				   s16 *Ga, s16 *Gb, s16 *Ha, s16 *Hb, u16 *Fa_scale)
+{
+	unsigned int read_tmp;
+	int ret;
+
+	ret = mlx90635_read_ee_register(regmap, MLX90635_EE_Ea, Ea);
+	if (ret < 0)
+		return ret;
+
+	ret = mlx90635_read_ee_register(regmap, MLX90635_EE_Eb, Eb);
+	if (ret < 0)
+		return ret;
+
+	ret = mlx90635_read_ee_register(regmap, MLX90635_EE_Fa, Fa);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_read(regmap, MLX90635_EE_Ha, &read_tmp);
+	if (ret < 0)
+		return ret;
+	*Ha = (s16)read_tmp;
+
+	ret = regmap_read(regmap, MLX90635_EE_Hb, &read_tmp);
+	if (ret < 0)
+		return ret;
+	*Hb = (s16)read_tmp;
+
+	ret = regmap_read(regmap, MLX90635_EE_Ga, &read_tmp);
+	if (ret < 0)
+		return ret;
+	*Ga = (s16)read_tmp;
+
+	ret = regmap_read(regmap, MLX90635_EE_Gb, &read_tmp);
+	if (ret < 0)
+		return ret;
+	*Gb = (s16)read_tmp;
+
+	ret = regmap_read(regmap, MLX90635_EE_Fb, &read_tmp);
+	if (ret < 0)
+		return ret;
+	*Fb = (s16)read_tmp;
+
+	ret = regmap_read(regmap, MLX90635_EE_FASCALE, &read_tmp);
+	if (ret < 0)
+		return ret;
+	*Fa_scale = (u16)read_tmp;
+
+	return 0;
+}
+
+static int mlx90635_calculate_dataset_ready_time(struct mlx90635_data *data, int *refresh_time)
+{
+	unsigned int reg;
+	int ret;
+
+	ret = regmap_read(data->regmap, MLX90635_REG_CTRL1, &reg);
+	if (ret < 0)
+		return ret;
+
+	*refresh_time = 2 * (MLX90635_MEAS_MAX_TIME >> FIELD_GET(MLX90635_CTRL1_REFRESH_RATE_MASK, reg)) + 80;
+
+	return 0;
+}
+
+static int mlx90635_perform_measurement_burst(struct mlx90635_data *data)
+{
+	unsigned int reg_status;
+	int refresh_time;
+	int ret;
+
+	ret = regmap_write_bits(data->regmap, MLX90635_REG_STATUS,
+				MLX90635_STAT_END_CONV, MLX90635_STAT_END_CONV);
+	if (ret < 0)
+		return ret;
+
+	ret = mlx90635_calculate_dataset_ready_time(data, &refresh_time);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_write_bits(data->regmap, MLX90635_REG_CTRL2,
+				FIELD_PREP(MLX90635_CTRL2_SOB_MASK, 1),
+				FIELD_PREP(MLX90635_CTRL2_SOB_MASK, 1));
+	if (ret < 0)
+		return ret;
+
+	msleep(refresh_time); /* Wait minimum time for dataset to be ready */
+
+	ret = regmap_read_poll_timeout(data->regmap, MLX90635_REG_STATUS, reg_status,
+				       (!(reg_status & MLX90635_STAT_END_CONV)) == 0,
+				       MLX90635_TIMING_POLLING, MLX90635_READ_RETRIES * 10000);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "data not ready");
+		return -ETIMEDOUT;
+	}
+
+	return 0;
+}
+
+static int mlx90635_read_ambient_raw(struct regmap *regmap,
+				     s16 *ambient_new_raw, s16 *ambient_old_raw)
+{
+	unsigned int read_tmp;
+	int ret;
+
+	ret = regmap_read(regmap, MLX90635_RESULT_2, &read_tmp);
+	if (ret < 0)
+		return ret;
+	*ambient_new_raw = (s16)read_tmp;
+
+	ret = regmap_read(regmap, MLX90635_RESULT_3, &read_tmp);
+	if (ret < 0)
+		return ret;
+	*ambient_old_raw = (s16)read_tmp;
+
+	return 0;
+}
+
+static int mlx90635_read_object_raw(struct regmap *regmap, s16 *object_raw)
+{
+	unsigned int read_tmp;
+	s16 read;
+	int ret;
+
+	ret = regmap_read(regmap, MLX90635_RESULT_1, &read_tmp);
+	if (ret < 0)
+		return ret;
+
+	read = (s16)read_tmp;
+
+	ret = regmap_read(regmap, MLX90635_RESULT_4, &read_tmp);
+	if (ret < 0)
+		return ret;
+	*object_raw = (read - (s16)read_tmp) / 2;
+
+	return 0;
+}
+
+static int mlx90635_read_all_channel(struct mlx90635_data *data,
+				     s16 *ambient_new_raw, s16 *ambient_old_raw,
+				     s16 *object_raw)
+{
+	int ret;
+
+	mutex_lock(&data->lock);
+	if (data->powerstatus == MLX90635_PWR_STATUS_SLEEP_STEP) {
+		/* Trigger measurement in Sleep Step mode */
+		ret = mlx90635_perform_measurement_burst(data);
+		if (ret < 0)
+			goto read_unlock;
+	}
+
+	ret = mlx90635_read_ambient_raw(data->regmap, ambient_new_raw,
+					ambient_old_raw);
+	if (ret < 0)
+		goto read_unlock;
+
+	ret = mlx90635_read_object_raw(data->regmap, object_raw);
+read_unlock:
+	mutex_unlock(&data->lock);
+	return ret;
+}
+
+static s64 mlx90635_preprocess_temp_amb(s16 ambient_new_raw,
+					s16 ambient_old_raw, s16 Gb)
+{
+	s64 VR_Ta, kGb, tmp;
+
+	kGb = ((s64)Gb * 1000LL) >> 10ULL;
+	VR_Ta = (s64)ambient_old_raw * 1000000LL +
+		kGb * div64_s64(((s64)ambient_new_raw * 1000LL),
+			(MLX90635_PTAT_DIV));
+	tmp = div64_s64(
+			 div64_s64(((s64)ambient_new_raw * 1000000000000LL),
+				   (MLX90635_PTAT_DIV)), VR_Ta);
+	return div64_s64(tmp << 19ULL, 1000LL);
+}
+
+static s64 mlx90635_preprocess_temp_obj(s16 object_raw,
+					s16 ambient_new_raw,
+					s16 ambient_old_raw, s16 Gb)
+{
+	s64 VR_IR, kGb, tmp;
+
+	kGb = ((s64)Gb * 1000LL) >> 10ULL;
+	VR_IR = (s64)ambient_old_raw * 1000000LL +
+		kGb * (div64_s64((s64)ambient_new_raw * 1000LL,
+			MLX90635_PTAT_DIV));
+	tmp = div64_s64(
+			div64_s64((s64)(object_raw * 1000000LL),
+				   MLX90635_IR_DIV) * 1000000LL,
+			VR_IR);
+	return div64_s64((tmp << 19ULL), 1000LL);
+}
+
+static s32 mlx90635_calc_temp_ambient(s16 ambient_new_raw, s16 ambient_old_raw,
+				      u16 P_G, u16 P_O, s16 Gb)
+{
+	s64 kPG, kPO, AMB;
+
+	AMB = mlx90635_preprocess_temp_amb(ambient_new_raw, ambient_old_raw,
+					   Gb);
+	kPG = ((s64)P_G * 1000000LL) >> 9ULL;
+	kPO = AMB - (((s64)P_O * 1000LL) >> 1ULL);
+
+	return 30 * 1000LL + div64_s64(kPO * 1000000LL, kPG);
+}
+
+static s32 mlx90635_calc_temp_object_iteration(s32 prev_object_temp, s64 object,
+					       s64 TAdut, s64 TAdut4, s16 Ga,
+					       u32 Fa, u16 Fa_scale, s16 Fb,
+					       s16 Ha, s16 Hb, u16 emissivity)
+{
+	s64 calcedGa, calcedGb, calcedFa, Alpha_corr;
+	s64 Ha_customer, Hb_customer;
+
+	Ha_customer = ((s64)Ha * 1000000LL) >> 14ULL;
+	Hb_customer = ((s64)Hb * 100) >> 10ULL;
+
+	calcedGa = ((s64)((s64)Ga * (prev_object_temp - 35 * 1000LL)
+			     * 1000LL)) >> 24LL;
+	calcedGb = ((s64)(Fb * (TAdut - 30 * 1000000LL))) >> 24LL;
+
+	Alpha_corr = ((s64)((s64)Fa * Ha_customer * 10000LL) >> Fa_scale);
+	Alpha_corr *= ((s64)(1 * 1000000LL + calcedGa + calcedGb));
+
+	Alpha_corr = div64_s64(Alpha_corr, 1000LL);
+	Alpha_corr *= emissivity;
+	Alpha_corr = div64_s64(Alpha_corr, 100LL);
+	calcedFa = div64_s64((s64)object * 100000000000LL, Alpha_corr);
+
+	return (int_sqrt64(int_sqrt64(calcedFa * 100000000LL + TAdut4))
+		- 27315 - Hb_customer) * 10;
+}
+
+static s64 mlx90635_calc_ta4(s64 TAdut, s64 scale)
+{
+	return (div64_s64(TAdut, scale) + 27315) *
+		(div64_s64(TAdut, scale) + 27315) *
+		(div64_s64(TAdut, scale) + 27315) *
+		(div64_s64(TAdut, scale) + 27315);
+}
+
+static s32 mlx90635_calc_temp_object(s64 object, s64 ambient, u32 Ea, u32 Eb,
+				     s16 Ga, u32 Fa, u16 Fa_scale, s16 Fb, s16 Ha, s16 Hb,
+				     u16 tmp_emi)
+{
+	s64 kTA, kTA0, TAdut, TAdut4;
+	s64 temp = 35000;
+	s8 i;
+
+	kTA = (Ea * 1000LL) >> 16LL;
+	kTA0 = (Eb * 1000LL) >> 8LL;
+	TAdut = div64_s64(((ambient - kTA0) * 1000000LL), kTA) + 30 * 1000000LL;
+	TAdut4 = mlx90635_calc_ta4(TAdut, 10000LL);
+
+	/* Iterations of calculation as described in datasheet */
+	for (i = 0; i < 5; ++i) {
+		temp = mlx90635_calc_temp_object_iteration(temp, object, TAdut, TAdut4,
+							   Ga, Fa, Fa_scale, Fb, Ha, Hb,
+							   tmp_emi);
+	}
+	return temp;
+}
+
+static int mlx90635_calc_object(struct mlx90635_data *data, int *val)
+{
+	s16 ambient_new_raw, ambient_old_raw, object_raw;
+	s16 Fb, Ga, Gb, Ha, Hb;
+	s64 object, ambient;
+	u32 Ea, Eb, Fa;
+	u16 Fa_scale;
+	int ret;
+
+	ret = mlx90635_read_ee_object(data->regmap_ee, &Ea, &Eb, &Fa, &Fb, &Ga, &Gb, &Ha, &Hb, &Fa_scale);
+	if (ret < 0)
+		return ret;
+
+	ret = mlx90635_read_all_channel(data,
+					&ambient_new_raw, &ambient_old_raw,
+					&object_raw);
+	if (ret < 0)
+		return ret;
+
+	ambient = mlx90635_preprocess_temp_amb(ambient_new_raw,
+					       ambient_old_raw, Gb);
+	object = mlx90635_preprocess_temp_obj(object_raw,
+					      ambient_new_raw,
+					      ambient_old_raw, Gb);
+
+	*val = mlx90635_calc_temp_object(object, ambient, Ea, Eb, Ga, Fa, Fa_scale, Fb,
+					 Ha, Hb, data->emissivity);
+	return 0;
+}
+
+static int mlx90635_calc_ambient(struct mlx90635_data *data, int *val)
+{
+	s16 ambient_new_raw, ambient_old_raw;
+	s16 PG, PO, Gb;
+	int ret;
+
+	ret = mlx90635_read_ee_ambient(data->regmap_ee, &PG, &PO, &Gb);
+	if (ret < 0)
+		return ret;
+
+	mutex_lock(&data->lock);
+	if (data->powerstatus == MLX90635_PWR_STATUS_SLEEP_STEP) {
+		ret = mlx90635_perform_measurement_burst(data);
+		if (ret < 0)
+			goto read_ambient_unlock;
+	}
+
+	ret = mlx90635_read_ambient_raw(data->regmap, &ambient_new_raw,
+					&ambient_old_raw);
+read_ambient_unlock:
+	mutex_unlock(&data->lock);
+	if (ret < 0)
+		return ret;
+
+	*val = mlx90635_calc_temp_ambient(ambient_new_raw, ambient_old_raw,
+					  PG, PO, Gb);
+	return ret;
+}
+
+static int mlx90635_get_refresh_rate(struct mlx90635_data *data,
+				     unsigned int *refresh_rate)
+{
+	unsigned int reg;
+	int ret;
+
+	ret = regmap_read(data->regmap, MLX90635_REG_CTRL1, &reg);
+	if (ret < 0)
+		return ret;
+
+	*refresh_rate = FIELD_GET(MLX90635_CTRL1_REFRESH_RATE_MASK, reg);
+
+	return 0;
+}
+
+static const struct {
+	int val;
+	int val2;
+} mlx90635_freqs[] = {
+	{ 0, 200000 },
+	{ 0, 500000 },
+	{ 0, 900000 },
+	{ 1, 700000 },
+	{ 3, 0 },
+	{ 4, 800000 },
+	{ 6, 900000 },
+	{ 8, 900000 }
+};
+
+/**
+ * mlx90635_pm_interaction_wakeup() - Measure time between user interactions to change powermode
+ * @data: pointer to mlx90635_data object containing interaction_ts information
+ *
+ * Switch to continuous mode when interaction is faster than MLX90635_MEAS_MAX_TIME. Update the
+ * interaction_ts for each function call with the jiffies to enable measurement between function
+ * calls. Initial value of the interaction_ts needs to be set before this function call.
+ */
+static int mlx90635_pm_interaction_wakeup(struct mlx90635_data *data)
+{
+	unsigned long now;
+	int ret;
+
+	now = jiffies;
+	if (time_in_range(now, data->interaction_ts,
+			  data->interaction_ts +
+			  msecs_to_jiffies(MLX90635_MEAS_MAX_TIME + 100))) {
+		ret = mlx90635_pwr_continuous(data);
+		if (ret < 0)
+			return ret;
+	}
+
+	data->interaction_ts = now;
+
+	return 0;
+}
+
+static int mlx90635_read_raw(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *channel, int *val,
+			     int *val2, long mask)
+{
+	struct mlx90635_data *data = iio_priv(indio_dev);
+	int ret;
+	int cr;
+
+	pm_runtime_get_sync(&data->client->dev);
+	ret = mlx90635_pm_interaction_wakeup(data);
+	if (ret < 0)
+		goto mlx90635_read_raw_pm;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_PROCESSED:
+		switch (channel->channel2) {
+		case IIO_MOD_TEMP_AMBIENT:
+			ret = mlx90635_calc_ambient(data, val);
+			if (ret < 0)
+				goto mlx90635_read_raw_pm;
+
+			ret = IIO_VAL_INT;
+			break;
+		case IIO_MOD_TEMP_OBJECT:
+			ret = mlx90635_calc_object(data, val);
+			if (ret < 0)
+				goto mlx90635_read_raw_pm;
+
+			ret = IIO_VAL_INT;
+			break;
+		default:
+			ret = -EINVAL;
+			break;
+		}
+		break;
+	case IIO_CHAN_INFO_CALIBEMISSIVITY:
+		if (data->emissivity == 1000) {
+			*val = 1;
+			*val2 = 0;
+		} else {
+			*val = 0;
+			*val2 = data->emissivity * 1000;
+		}
+		ret = IIO_VAL_INT_PLUS_MICRO;
+		break;
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		ret = mlx90635_get_refresh_rate(data, &cr);
+		if (ret < 0)
+			goto mlx90635_read_raw_pm;
+
+		*val = mlx90635_freqs[cr].val;
+		*val2 = mlx90635_freqs[cr].val2;
+		ret = IIO_VAL_INT_PLUS_MICRO;
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+mlx90635_read_raw_pm:
+	pm_runtime_put_autosuspend(&data->client->dev);
+	return ret;
+}
+
+static int mlx90635_write_raw(struct iio_dev *indio_dev,
+			      struct iio_chan_spec const *channel, int val,
+			      int val2, long mask)
+{
+	struct mlx90635_data *data = iio_priv(indio_dev);
+	int ret;
+	int i;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_CALIBEMISSIVITY:
+		/* Confirm we are within 0 and 1.0 */
+		if (val < 0 || val2 < 0 || val > 1 ||
+		    (val == 1 && val2 != 0))
+			return -EINVAL;
+		data->emissivity = val * 1000 + val2 / 1000;
+		return 0;
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		for (i = 0; i < ARRAY_SIZE(mlx90635_freqs); i++) {
+			if (val == mlx90635_freqs[i].val &&
+			    val2 == mlx90635_freqs[i].val2)
+				break;
+		}
+		if (i == ARRAY_SIZE(mlx90635_freqs))
+			return -EINVAL;
+
+		ret = regmap_write_bits(data->regmap, MLX90635_REG_CTRL1,
+					MLX90635_CTRL1_REFRESH_RATE_MASK, i);
+
+		return ret;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int mlx90635_read_avail(struct iio_dev *indio_dev,
+			       struct iio_chan_spec const *chan,
+			       const int **vals, int *type, int *length,
+			       long mask)
+{
+	switch (mask) {
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		*vals = (int *)mlx90635_freqs;
+		*type = IIO_VAL_INT_PLUS_MICRO;
+		*length = 2 * ARRAY_SIZE(mlx90635_freqs);
+		return IIO_AVAIL_LIST;
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct iio_chan_spec mlx90635_channels[] = {
+	{
+		.type = IIO_TEMP,
+		.modified = 1,
+		.channel2 = IIO_MOD_TEMP_AMBIENT,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+		.info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+	},
+	{
+		.type = IIO_TEMP,
+		.modified = 1,
+		.channel2 = IIO_MOD_TEMP_OBJECT,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
+			BIT(IIO_CHAN_INFO_CALIBEMISSIVITY),
+		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+		.info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+	},
+};
+
+static const struct iio_info mlx90635_info = {
+	.read_raw = mlx90635_read_raw,
+	.write_raw = mlx90635_write_raw,
+	.read_avail = mlx90635_read_avail,
+};
+
+static void mlx90635_sleep(void *_data)
+{
+	struct mlx90635_data *data = _data;
+
+	mlx90635_pwr_sleep_step(data);
+}
+
+static int mlx90635_suspend(struct mlx90635_data *data)
+{
+	return mlx90635_pwr_sleep_step(data);
+}
+
+static int mlx90635_wakeup(struct mlx90635_data *data)
+{
+	s16 Fb, Ga, Gb, Ha, Hb, PG, PO;
+	unsigned int dsp_version;
+	u32 Ea, Eb, Fa;
+	u16 Fa_scale;
+	int ret;
+
+	regcache_cache_bypass(data->regmap_ee, false);
+	regcache_cache_only(data->regmap_ee, false);
+	regcache_cache_only(data->regmap, false);
+
+	ret = mlx90635_pwr_continuous(data);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "Switch to continuous mode failed\n");
+		return ret;
+	}
+	ret = regmap_write_bits(data->regmap, MLX90635_REG_EE,
+				MLX90635_EE_ACTIVE, MLX90635_EE_ACTIVE);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "Powering EEPROM failed\n");
+		return ret;
+	}
+	usleep_range(MLX90635_TIMING_EE_ACTIVE_MIN, MLX90635_TIMING_EE_ACTIVE_MAX);
+
+	regcache_mark_dirty(data->regmap_ee);
+
+	ret = regcache_sync(data->regmap_ee);
+	if (ret < 0) {
+		dev_err(&data->client->dev,
+			"Failed to sync cache: %d\n", ret);
+		return ret;
+	}
+
+	ret = mlx90635_read_ee_ambient(data->regmap_ee, &PG, &PO, &Gb);
+	if (ret < 0) {
+		dev_err(&data->client->dev,
+			"Failed to read to cache Ambient coefficients EEPROM region: %d\n", ret);
+		return ret;
+	}
+
+	ret = mlx90635_read_ee_object(data->regmap_ee, &Ea, &Eb, &Fa, &Fb, &Ga, &Gb, &Ha, &Hb, &Fa_scale);
+	if (ret < 0) {
+		dev_err(&data->client->dev,
+			"Failed to read to cache Object coefficients EEPROM region: %d\n", ret);
+		return ret;
+	}
+
+	ret = regmap_read(data->regmap_ee, MLX90635_EE_VERSION, &dsp_version);
+	if (ret < 0) {
+		dev_err(&data->client->dev,
+			"Failed to read to cache of EEPROM version: %d\n", ret);
+		return ret;
+	}
+
+	regcache_cache_only(data->regmap_ee, true);
+
+	return ret;
+}
+
+static void mlx90635_disable_regulator(void *_data)
+{
+	struct mlx90635_data *data = _data;
+	int ret;
+
+	ret = regulator_disable(data->regulator);
+	if (ret < 0)
+		dev_err(regmap_get_device(data->regmap),
+			"Failed to disable power regulator: %d\n", ret);
+}
+
+static int mlx90635_enable_regulator(struct mlx90635_data *data)
+{
+	int ret;
+
+	ret = regulator_enable(data->regulator);
+	if (ret < 0) {
+		dev_err(regmap_get_device(data->regmap), "Failed to enable power regulator!\n");
+		return ret;
+	}
+
+	mlx90635_reset_delay();
+
+	return ret;
+}
+
+static int mlx90635_probe(struct i2c_client *client)
+{
+	struct mlx90635_data *mlx90635;
+	struct iio_dev *indio_dev;
+	unsigned int dsp_version;
+	struct regmap *regmap;
+	struct regmap *regmap_ee;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*mlx90635));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	regmap = devm_regmap_init_i2c(client, &mlx90635_regmap);
+	if (IS_ERR(regmap))
+		return dev_err_probe(&client->dev, PTR_ERR(regmap),
+				     "failed to allocate regmap\n");
+
+	regmap_ee = devm_regmap_init_i2c(client, &mlx90635_regmap_ee);
+	if (IS_ERR(regmap_ee))
+		return dev_err_probe(&client->dev, PTR_ERR(regmap_ee),
+				     "failed to allocate EEPROM regmap\n");
+
+	mlx90635 = iio_priv(indio_dev);
+	i2c_set_clientdata(client, indio_dev);
+	mlx90635->client = client;
+	mlx90635->regmap = regmap;
+	mlx90635->regmap_ee = regmap_ee;
+	mlx90635->powerstatus = MLX90635_PWR_STATUS_SLEEP_STEP;
+
+	mutex_init(&mlx90635->lock);
+	indio_dev->name = "mlx90635";
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->info = &mlx90635_info;
+	indio_dev->channels = mlx90635_channels;
+	indio_dev->num_channels = ARRAY_SIZE(mlx90635_channels);
+
+	mlx90635->regulator = devm_regulator_get(&client->dev, "vdd");
+	if (IS_ERR(mlx90635->regulator))
+		return dev_err_probe(&client->dev, PTR_ERR(mlx90635->regulator),
+				     "failed to get vdd regulator");
+
+	ret = mlx90635_enable_regulator(mlx90635);
+	if (ret < 0)
+		return ret;
+
+	ret = devm_add_action_or_reset(&client->dev, mlx90635_disable_regulator,
+				       mlx90635);
+	if (ret < 0)
+		return ret;
+
+	ret = mlx90635_wakeup(mlx90635);
+	if (ret < 0)
+		return dev_err_probe(&client->dev, ret, "wakeup failed\n");
+
+	ret = devm_add_action_or_reset(&client->dev, mlx90635_sleep, mlx90635);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_read(mlx90635->regmap_ee, MLX90635_EE_VERSION, &dsp_version);
+	if (ret < 0)
+		return dev_err_probe(&client->dev, ret, "read of version failed\n");
+
+	dsp_version = dsp_version & MLX90635_VERSION_MASK;
+
+	if (FIELD_GET(MLX90635_DSP_FIXED, dsp_version)) {
+		if (MLX90635_DSP_VERSION(dsp_version) == MLX90635_ID_DSPv1) {
+			dev_dbg(&client->dev,
+				"Detected DSP v1 calibration %x\n", dsp_version);
+		} else {
+			dev_dbg(&client->dev,
+				"Detected Unknown EEPROM calibration %lx\n",
+				MLX90635_DSP_VERSION(dsp_version));
+		}
+	} else {
+		return dev_err_probe(&client->dev, -EPROTONOSUPPORT,
+			"Wrong fixed top bit %x (expected 0x8X0X)\n",
+			dsp_version);
+	}
+
+	mlx90635->emissivity = 1000;
+	mlx90635->interaction_ts = jiffies; /* Set initial value */
+
+	pm_runtime_get_noresume(&client->dev);
+	pm_runtime_set_active(&client->dev);
+
+	ret = devm_pm_runtime_enable(&client->dev);
+	if (ret)
+		return dev_err_probe(&client->dev, ret,
+				     "failed to enable powermanagement\n");
+
+	pm_runtime_set_autosuspend_delay(&client->dev, MLX90635_SLEEP_DELAY_MS);
+	pm_runtime_use_autosuspend(&client->dev);
+	pm_runtime_put_autosuspend(&client->dev);
+
+	return devm_iio_device_register(&client->dev, indio_dev);
+}
+
+static const struct i2c_device_id mlx90635_id[] = {
+	{ .name = "mlx90635" },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, mlx90635_id);
+
+static const struct of_device_id mlx90635_of_match[] = {
+	{ .compatible = "melexis,mlx90635" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, mlx90635_of_match);
+
+static int mlx90635_pm_suspend(struct device *dev)
+{
+	struct mlx90635_data *data = iio_priv(dev_get_drvdata(dev));
+	int ret;
+
+	ret = mlx90635_suspend(data);
+	if (ret < 0)
+		return ret;
+
+	ret = regulator_disable(data->regulator);
+	if (ret < 0)
+		dev_err(regmap_get_device(data->regmap),
+			"Failed to disable power regulator: %d\n", ret);
+
+	return ret;
+}
+
+static int mlx90635_pm_resume(struct device *dev)
+{
+	struct mlx90635_data *data = iio_priv(dev_get_drvdata(dev));
+	int ret;
+
+	ret = mlx90635_enable_regulator(data);
+	if (ret < 0)
+		return ret;
+
+	return mlx90635_wakeup(data);
+}
+
+static int mlx90635_pm_runtime_suspend(struct device *dev)
+{
+	struct mlx90635_data *data = iio_priv(dev_get_drvdata(dev));
+
+	return mlx90635_pwr_sleep_step(data);
+}
+
+static const struct dev_pm_ops mlx90635_pm_ops = {
+	SYSTEM_SLEEP_PM_OPS(mlx90635_pm_suspend, mlx90635_pm_resume)
+	RUNTIME_PM_OPS(mlx90635_pm_runtime_suspend, NULL, NULL)
+};
+
+static struct i2c_driver mlx90635_driver = {
+	.driver = {
+		.name	= "mlx90635",
+		.of_match_table = mlx90635_of_match,
+		.pm	= pm_ptr(&mlx90635_pm_ops),
+	},
+	.probe = mlx90635_probe,
+	.id_table = mlx90635_id,
+};
+module_i2c_driver(mlx90635_driver);
+
+MODULE_AUTHOR("Crt Mori <cmo@melexis.com>");
+MODULE_DESCRIPTION("Melexis MLX90635 contactless Infra Red temperature sensor driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/iio/temperature/tmp006.c b/drivers/iio/temperature/tmp006.c
new file mode 100644
index 000000000..d9f6449ec
--- /dev/null
+++ b/drivers/iio/temperature/tmp006.c
@@ -0,0 +1,411 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * tmp006.c - Support for TI TMP006 IR thermopile sensor
+ *
+ * Copyright (c) 2013 Peter Meerwald <pmeerw@pmeerw.net>
+ *
+ * Driver for the Texas Instruments I2C 16-bit IR thermopile sensor
+ *
+ * (7-bit I2C slave address 0x40, changeable via ADR pins)
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/pm.h>
+#include <linux/bitops.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/trigger_consumer.h>
+
+#define TMP006_VOBJECT 0x00
+#define TMP006_TAMBIENT 0x01
+#define TMP006_CONFIG 0x02
+#define TMP006_MANUFACTURER_ID 0xfe
+#define TMP006_DEVICE_ID 0xff
+
+#define TMP006_TAMBIENT_SHIFT 2
+
+#define TMP006_CONFIG_RESET BIT(15)
+#define TMP006_CONFIG_DRDY_EN BIT(8)
+#define TMP006_CONFIG_DRDY BIT(7)
+
+#define TMP006_CONFIG_MOD_MASK GENMASK(14, 12)
+
+#define TMP006_CONFIG_CR_MASK GENMASK(11, 9)
+#define TMP006_CONFIG_CR_SHIFT 9
+
+#define TMP006_MANUFACTURER_MAGIC 0x5449
+#define TMP006_DEVICE_MAGIC 0x0067
+
+struct tmp006_data {
+	struct i2c_client *client;
+	u16 config;
+	struct iio_trigger *drdy_trig;
+};
+
+static int tmp006_read_measurement(struct tmp006_data *data, u8 reg)
+{
+	s32 ret;
+	int tries = 50;
+
+	while (tries-- > 0) {
+		ret = i2c_smbus_read_word_swapped(data->client,
+			TMP006_CONFIG);
+		if (ret < 0)
+			return ret;
+		if (ret & TMP006_CONFIG_DRDY)
+			break;
+		msleep(100);
+	}
+
+	if (tries < 0)
+		return -EIO;
+
+	return i2c_smbus_read_word_swapped(data->client, reg);
+}
+
+static const int tmp006_freqs[5][2] = { {4, 0}, {2, 0}, {1, 0},
+					{0, 500000}, {0, 250000} };
+
+static int tmp006_read_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *channel, int *val,
+			    int *val2, long mask)
+{
+	struct tmp006_data *data = iio_priv(indio_dev);
+	s32 ret;
+	int cr;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		if (channel->type == IIO_VOLTAGE) {
+			/* LSB is 156.25 nV */
+			if (!iio_device_claim_direct(indio_dev))
+				return -EBUSY;
+
+			ret = tmp006_read_measurement(data, TMP006_VOBJECT);
+			iio_device_release_direct(indio_dev);
+			if (ret < 0)
+				return ret;
+
+			*val = sign_extend32(ret, 15);
+		} else if (channel->type == IIO_TEMP) {
+			/* LSB is 0.03125 degrees Celsius */
+			if (!iio_device_claim_direct(indio_dev))
+				return -EBUSY;
+
+			ret = tmp006_read_measurement(data, TMP006_TAMBIENT);
+			iio_device_release_direct(indio_dev);
+			if (ret < 0)
+				return ret;
+
+			*val = sign_extend32(ret, 15) >> TMP006_TAMBIENT_SHIFT;
+		} else {
+			break;
+		}
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SCALE:
+		if (channel->type == IIO_VOLTAGE) {
+			*val = 0;
+			*val2 = 156250;
+		} else if (channel->type == IIO_TEMP) {
+			*val = 31;
+			*val2 = 250000;
+		} else {
+			break;
+		}
+		return IIO_VAL_INT_PLUS_MICRO;
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		cr = (data->config & TMP006_CONFIG_CR_MASK)
+			>> TMP006_CONFIG_CR_SHIFT;
+		*val = tmp006_freqs[cr][0];
+		*val2 = tmp006_freqs[cr][1];
+		return IIO_VAL_INT_PLUS_MICRO;
+	default:
+		break;
+	}
+
+	return -EINVAL;
+}
+
+static int tmp006_write_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int val,
+			    int val2,
+			    long mask)
+{
+	struct tmp006_data *data = iio_priv(indio_dev);
+	int ret, i;
+
+	if (mask != IIO_CHAN_INFO_SAMP_FREQ)
+		return -EINVAL;
+
+	for (i = 0; i < ARRAY_SIZE(tmp006_freqs); i++)
+		if ((val == tmp006_freqs[i][0]) &&
+		    (val2 == tmp006_freqs[i][1])) {
+			if (!iio_device_claim_direct(indio_dev))
+				return -EBUSY;
+
+			data->config &= ~TMP006_CONFIG_CR_MASK;
+			data->config |= i << TMP006_CONFIG_CR_SHIFT;
+
+			ret = i2c_smbus_write_word_swapped(data->client,
+							   TMP006_CONFIG,
+							   data->config);
+
+			iio_device_release_direct(indio_dev);
+			return ret;
+		}
+	return -EINVAL;
+}
+
+static IIO_CONST_ATTR(sampling_frequency_available, "4 2 1 0.5 0.25");
+
+static struct attribute *tmp006_attributes[] = {
+	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group tmp006_attribute_group = {
+	.attrs = tmp006_attributes,
+};
+
+static const struct iio_chan_spec tmp006_channels[] = {
+	{
+		.type = IIO_VOLTAGE,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+			BIT(IIO_CHAN_INFO_SCALE),
+		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+		.scan_index = 0,
+		.scan_type = {
+			.sign = 's',
+			.realbits = 16,
+			.storagebits = 16,
+			.endianness = IIO_BE,
+		}
+	},
+	{
+		.type = IIO_TEMP,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+			BIT(IIO_CHAN_INFO_SCALE),
+		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+		.scan_index = 1,
+		.scan_type = {
+			.sign = 's',
+			.realbits = 14,
+			.storagebits = 16,
+			.shift = TMP006_TAMBIENT_SHIFT,
+			.endianness = IIO_BE,
+		}
+	},
+	IIO_CHAN_SOFT_TIMESTAMP(2),
+};
+
+static const struct iio_info tmp006_info = {
+	.read_raw = tmp006_read_raw,
+	.write_raw = tmp006_write_raw,
+	.attrs = &tmp006_attribute_group,
+};
+
+static bool tmp006_check_identification(struct i2c_client *client)
+{
+	int mid, did;
+
+	mid = i2c_smbus_read_word_swapped(client, TMP006_MANUFACTURER_ID);
+	if (mid < 0)
+		return false;
+
+	did = i2c_smbus_read_word_swapped(client, TMP006_DEVICE_ID);
+	if (did < 0)
+		return false;
+
+	return mid == TMP006_MANUFACTURER_MAGIC && did == TMP006_DEVICE_MAGIC;
+}
+
+static int tmp006_power(struct device *dev, bool up)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+	struct tmp006_data *data = iio_priv(indio_dev);
+
+	if (up)
+		data->config |= TMP006_CONFIG_MOD_MASK;
+	else
+		data->config &= ~TMP006_CONFIG_MOD_MASK;
+
+	return i2c_smbus_write_word_swapped(data->client, TMP006_CONFIG,
+		data->config);
+}
+
+static void tmp006_powerdown_cleanup(void *dev)
+{
+	tmp006_power(dev, false);
+}
+
+static irqreturn_t tmp006_trigger_handler(int irq, void *p)
+{
+	struct iio_poll_func *pf = p;
+	struct iio_dev *indio_dev = pf->indio_dev;
+	struct tmp006_data *data = iio_priv(indio_dev);
+	struct {
+		s16 channels[2];
+		aligned_s64 ts;
+	} scan = { };
+	s32 ret;
+
+	ret = i2c_smbus_read_word_data(data->client, TMP006_VOBJECT);
+	if (ret < 0)
+		goto err;
+	scan.channels[0] = ret;
+
+	ret = i2c_smbus_read_word_data(data->client, TMP006_TAMBIENT);
+	if (ret < 0)
+		goto err;
+	scan.channels[1] = ret;
+
+	iio_push_to_buffers_with_ts(indio_dev, &scan, sizeof(scan),
+				    iio_get_time_ns(indio_dev));
+err:
+	iio_trigger_notify_done(indio_dev->trig);
+	return IRQ_HANDLED;
+}
+
+static int tmp006_set_trigger_state(struct iio_trigger *trig, bool state)
+{
+	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+	struct tmp006_data *data = iio_priv(indio_dev);
+
+	if (state)
+		data->config |= TMP006_CONFIG_DRDY_EN;
+	else
+		data->config &= ~TMP006_CONFIG_DRDY_EN;
+
+	return i2c_smbus_write_word_swapped(data->client, TMP006_CONFIG,
+					    data->config);
+}
+
+static const struct iio_trigger_ops tmp006_trigger_ops = {
+	.set_trigger_state = tmp006_set_trigger_state,
+};
+
+static const unsigned long tmp006_scan_masks[] = { 0x3, 0 };
+
+static int tmp006_probe(struct i2c_client *client)
+{
+	struct iio_dev *indio_dev;
+	struct tmp006_data *data;
+	int ret;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
+		return -EOPNOTSUPP;
+
+	if (!tmp006_check_identification(client)) {
+		dev_err(&client->dev, "no TMP006 sensor\n");
+		return -ENODEV;
+	}
+
+	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	data = iio_priv(indio_dev);
+	i2c_set_clientdata(client, indio_dev);
+	data->client = client;
+
+	indio_dev->name = dev_name(&client->dev);
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->info = &tmp006_info;
+
+	indio_dev->channels = tmp006_channels;
+	indio_dev->num_channels = ARRAY_SIZE(tmp006_channels);
+	indio_dev->available_scan_masks = tmp006_scan_masks;
+
+	ret = i2c_smbus_read_word_swapped(data->client, TMP006_CONFIG);
+	if (ret < 0)
+		return ret;
+	data->config = ret;
+
+	if ((ret & TMP006_CONFIG_MOD_MASK) != TMP006_CONFIG_MOD_MASK) {
+		ret = tmp006_power(&client->dev, true);
+		if (ret < 0)
+			return ret;
+	}
+
+	ret = devm_add_action_or_reset(&client->dev, tmp006_powerdown_cleanup,
+				       &client->dev);
+	if (ret < 0)
+		return ret;
+
+	if (client->irq > 0) {
+		data->drdy_trig = devm_iio_trigger_alloc(&client->dev,
+							 "%s-dev%d",
+							 indio_dev->name,
+							 iio_device_id(indio_dev));
+		if (!data->drdy_trig)
+			return -ENOMEM;
+
+		data->drdy_trig->ops = &tmp006_trigger_ops;
+		iio_trigger_set_drvdata(data->drdy_trig, indio_dev);
+		ret = devm_iio_trigger_register(&client->dev, data->drdy_trig);
+		if (ret)
+			return ret;
+
+		indio_dev->trig = iio_trigger_get(data->drdy_trig);
+
+		ret = devm_request_irq(&client->dev, client->irq,
+				       iio_trigger_generic_data_rdy_poll,
+				       IRQF_NO_THREAD, "tmp006_irq",
+				       data->drdy_trig);
+		if (ret < 0)
+			return ret;
+	}
+
+	ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev, NULL,
+					      tmp006_trigger_handler, NULL);
+	if (ret < 0)
+		return ret;
+
+	return devm_iio_device_register(&client->dev, indio_dev);
+}
+
+static int tmp006_suspend(struct device *dev)
+{
+	return tmp006_power(dev, false);
+}
+
+static int tmp006_resume(struct device *dev)
+{
+	return tmp006_power(dev, true);
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(tmp006_pm_ops, tmp006_suspend, tmp006_resume);
+
+static const struct of_device_id tmp006_of_match[] = {
+	{ .compatible = "ti,tmp006" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, tmp006_of_match);
+
+static const struct i2c_device_id tmp006_id[] = {
+	{ .name = "tmp006" },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, tmp006_id);
+
+static struct i2c_driver tmp006_driver = {
+	.driver = {
+		.name	= "tmp006",
+		.of_match_table = tmp006_of_match,
+		.pm	= pm_sleep_ptr(&tmp006_pm_ops),
+	},
+	.probe = tmp006_probe,
+	.id_table = tmp006_id,
+};
+module_i2c_driver(tmp006_driver);
+
+MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
+MODULE_DESCRIPTION("TI TMP006 IR thermopile sensor driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/iio/temperature/tmp007.c b/drivers/iio/temperature/tmp007.c
new file mode 100644
index 000000000..4e743424f
--- /dev/null
+++ b/drivers/iio/temperature/tmp007.c
@@ -0,0 +1,581 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * tmp007.c - Support for TI TMP007 IR thermopile sensor with integrated math engine
+ *
+ * Copyright (c) 2017 Manivannan Sadhasivam <manivannanece23@gmail.com>
+ *
+ * Driver for the Texas Instruments I2C 16-bit IR thermopile sensor
+ *
+ * (7-bit I2C slave address (0x40 - 0x47), changeable via ADR pins)
+ *
+ * Note:
+ * 1. This driver assumes that the sensor has been calibrated beforehand
+ * 2. Limit threshold events are enabled at the start
+ * 3. Operating mode: INT
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/pm.h>
+#include <linux/bitops.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/events.h>
+
+#define TMP007_TDIE 0x01
+#define TMP007_CONFIG 0x02
+#define TMP007_TOBJECT 0x03
+#define TMP007_STATUS 0x04
+#define TMP007_STATUS_MASK 0x05
+#define TMP007_TOBJ_HIGH_LIMIT 0x06
+#define TMP007_TOBJ_LOW_LIMIT 0x07
+#define TMP007_TDIE_HIGH_LIMIT 0x08
+#define TMP007_TDIE_LOW_LIMIT 0x09
+#define TMP007_MANUFACTURER_ID 0x1e
+#define TMP007_DEVICE_ID 0x1f
+
+#define TMP007_CONFIG_CONV_EN BIT(12)
+#define TMP007_CONFIG_TC_EN BIT(6)
+#define TMP007_CONFIG_CR_MASK GENMASK(11, 9)
+#define TMP007_CONFIG_ALERT_EN BIT(8)
+#define TMP007_CONFIG_CR_SHIFT 9
+
+/* Status register flags */
+#define TMP007_STATUS_ALERT BIT(15)
+#define TMP007_STATUS_CONV_READY BIT(14)
+#define TMP007_STATUS_OHF BIT(13)
+#define TMP007_STATUS_OLF BIT(12)
+#define TMP007_STATUS_LHF BIT(11)
+#define TMP007_STATUS_LLF BIT(10)
+#define TMP007_STATUS_DATA_VALID BIT(9)
+
+#define TMP007_MANUFACTURER_MAGIC 0x5449
+#define TMP007_DEVICE_MAGIC 0x0078
+
+#define TMP007_TEMP_SHIFT 2
+
+struct tmp007_data {
+	struct i2c_client *client;
+	struct mutex lock;
+	u16 config;
+	u16 status_mask;
+};
+
+static const int tmp007_avgs[5][2] = { {4, 0}, {2, 0}, {1, 0},
+					{0, 500000}, {0, 250000} };
+
+static int tmp007_read_temperature(struct tmp007_data *data, u8 reg)
+{
+	s32 ret;
+	int tries = 50;
+
+	while (tries-- > 0) {
+		ret = i2c_smbus_read_word_swapped(data->client,
+			TMP007_STATUS);
+		if (ret < 0)
+			return ret;
+		if ((ret & TMP007_STATUS_CONV_READY) &&
+			!(ret & TMP007_STATUS_DATA_VALID))
+				break;
+		msleep(100);
+	}
+
+	if (tries < 0)
+		return -EIO;
+
+	return i2c_smbus_read_word_swapped(data->client, reg);
+}
+
+static int tmp007_powerdown(struct tmp007_data *data)
+{
+	return i2c_smbus_write_word_swapped(data->client, TMP007_CONFIG,
+			data->config & ~TMP007_CONFIG_CONV_EN);
+}
+
+static int tmp007_read_raw(struct iio_dev *indio_dev,
+		struct iio_chan_spec const *channel, int *val,
+		int *val2, long mask)
+{
+	struct tmp007_data *data = iio_priv(indio_dev);
+	s32 ret;
+	int conv_rate;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		switch (channel->channel2) {
+		case IIO_MOD_TEMP_AMBIENT: /* LSB: 0.03125 degree Celsius */
+			ret = i2c_smbus_read_word_swapped(data->client, TMP007_TDIE);
+			if (ret < 0)
+				return ret;
+			break;
+		case IIO_MOD_TEMP_OBJECT:
+			ret = tmp007_read_temperature(data, TMP007_TOBJECT);
+			if (ret < 0)
+				return ret;
+			break;
+		default:
+			return -EINVAL;
+		}
+
+		*val = sign_extend32(ret, 15) >> TMP007_TEMP_SHIFT;
+
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SCALE:
+		*val = 31;
+		*val2 = 250000;
+
+		return IIO_VAL_INT_PLUS_MICRO;
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		conv_rate = (data->config & TMP007_CONFIG_CR_MASK)
+				>> TMP007_CONFIG_CR_SHIFT;
+		*val = tmp007_avgs[conv_rate][0];
+		*val2 = tmp007_avgs[conv_rate][1];
+
+		return IIO_VAL_INT_PLUS_MICRO;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int tmp007_write_raw(struct iio_dev *indio_dev,
+		struct iio_chan_spec const *channel, int val,
+		int val2, long mask)
+{
+	struct tmp007_data *data = iio_priv(indio_dev);
+	int i;
+	u16 tmp;
+
+	if (mask == IIO_CHAN_INFO_SAMP_FREQ) {
+		for (i = 0; i < ARRAY_SIZE(tmp007_avgs); i++) {
+			if ((val == tmp007_avgs[i][0]) &&
+			(val2 == tmp007_avgs[i][1])) {
+				tmp = data->config & ~TMP007_CONFIG_CR_MASK;
+				tmp |= (i << TMP007_CONFIG_CR_SHIFT);
+
+				return i2c_smbus_write_word_swapped(data->client,
+								TMP007_CONFIG,
+								data->config = tmp);
+			}
+		}
+	}
+
+	return -EINVAL;
+}
+
+static irqreturn_t tmp007_interrupt_handler(int irq, void *private)
+{
+	struct iio_dev *indio_dev = private;
+	struct tmp007_data *data = iio_priv(indio_dev);
+	int ret;
+
+	ret = i2c_smbus_read_word_swapped(data->client, TMP007_STATUS);
+	if ((ret < 0) || !(ret & (TMP007_STATUS_OHF | TMP007_STATUS_OLF |
+				TMP007_STATUS_LHF | TMP007_STATUS_LLF)))
+		return IRQ_NONE;
+
+	if (ret & TMP007_STATUS_OHF)
+		iio_push_event(indio_dev,
+				IIO_MOD_EVENT_CODE(IIO_TEMP, 0,
+					IIO_MOD_TEMP_OBJECT,
+					IIO_EV_TYPE_THRESH,
+					IIO_EV_DIR_RISING),
+				iio_get_time_ns(indio_dev));
+
+	if (ret & TMP007_STATUS_OLF)
+		iio_push_event(indio_dev,
+				IIO_MOD_EVENT_CODE(IIO_TEMP, 0,
+					IIO_MOD_TEMP_OBJECT,
+					IIO_EV_TYPE_THRESH,
+					IIO_EV_DIR_FALLING),
+				iio_get_time_ns(indio_dev));
+
+	if (ret & TMP007_STATUS_LHF)
+		iio_push_event(indio_dev,
+				IIO_MOD_EVENT_CODE(IIO_TEMP, 0,
+					IIO_MOD_TEMP_AMBIENT,
+					IIO_EV_TYPE_THRESH,
+					IIO_EV_DIR_RISING),
+				iio_get_time_ns(indio_dev));
+
+	if (ret & TMP007_STATUS_LLF)
+		iio_push_event(indio_dev,
+				IIO_MOD_EVENT_CODE(IIO_TEMP, 0,
+					IIO_MOD_TEMP_AMBIENT,
+					IIO_EV_TYPE_THRESH,
+					IIO_EV_DIR_FALLING),
+				iio_get_time_ns(indio_dev));
+
+	return IRQ_HANDLED;
+}
+
+static int tmp007_write_event_config(struct iio_dev *indio_dev,
+		const struct iio_chan_spec *chan, enum iio_event_type type,
+		enum iio_event_direction dir, bool state)
+{
+	struct tmp007_data *data = iio_priv(indio_dev);
+	unsigned int status_mask;
+	int ret;
+
+	switch (chan->channel2) {
+	case IIO_MOD_TEMP_AMBIENT:
+	if (dir == IIO_EV_DIR_RISING)
+			status_mask = TMP007_STATUS_LHF;
+		else
+			status_mask = TMP007_STATUS_LLF;
+		break;
+	case IIO_MOD_TEMP_OBJECT:
+		if (dir == IIO_EV_DIR_RISING)
+			status_mask = TMP007_STATUS_OHF;
+		else
+			status_mask = TMP007_STATUS_OLF;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	mutex_lock(&data->lock);
+	ret = i2c_smbus_read_word_swapped(data->client, TMP007_STATUS_MASK);
+	mutex_unlock(&data->lock);
+	if (ret < 0)
+		return ret;
+
+	if (state)
+		ret |= status_mask;
+	else
+		ret &= ~status_mask;
+
+	return i2c_smbus_write_word_swapped(data->client, TMP007_STATUS_MASK,
+					data->status_mask = ret);
+}
+
+static int tmp007_read_event_config(struct iio_dev *indio_dev,
+		const struct iio_chan_spec *chan, enum iio_event_type type,
+		enum iio_event_direction dir)
+{
+	struct tmp007_data *data = iio_priv(indio_dev);
+	unsigned int mask;
+
+	switch (chan->channel2) {
+	case IIO_MOD_TEMP_AMBIENT:
+		if (dir == IIO_EV_DIR_RISING)
+			mask = TMP007_STATUS_LHF;
+		else
+			mask = TMP007_STATUS_LLF;
+		break;
+	case IIO_MOD_TEMP_OBJECT:
+		if (dir == IIO_EV_DIR_RISING)
+			mask = TMP007_STATUS_OHF;
+		else
+			mask = TMP007_STATUS_OLF;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return !!(data->status_mask & mask);
+}
+
+static int tmp007_read_thresh(struct iio_dev *indio_dev,
+		const struct iio_chan_spec *chan, enum iio_event_type type,
+		enum iio_event_direction dir, enum iio_event_info info,
+		int *val, int *val2)
+{
+	struct tmp007_data *data = iio_priv(indio_dev);
+	int ret;
+	u8 reg;
+
+	switch (chan->channel2) {
+	case IIO_MOD_TEMP_AMBIENT: /* LSB: 0.5 degree Celsius */
+		if (dir == IIO_EV_DIR_RISING)
+			reg = TMP007_TDIE_HIGH_LIMIT;
+		else
+			reg = TMP007_TDIE_LOW_LIMIT;
+		break;
+	case IIO_MOD_TEMP_OBJECT:
+		if (dir == IIO_EV_DIR_RISING)
+			reg = TMP007_TOBJ_HIGH_LIMIT;
+	else
+			reg = TMP007_TOBJ_LOW_LIMIT;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	ret = i2c_smbus_read_word_swapped(data->client, reg);
+	if (ret < 0)
+		return ret;
+
+	/* Shift length 7 bits = 6(15:6) + 1(0.5 LSB) */
+	*val = sign_extend32(ret, 15) >> 7;
+
+	return IIO_VAL_INT;
+}
+
+static int tmp007_write_thresh(struct iio_dev *indio_dev,
+		const struct iio_chan_spec *chan, enum iio_event_type type,
+		enum iio_event_direction dir, enum iio_event_info info,
+		int val, int val2)
+{
+	struct tmp007_data *data = iio_priv(indio_dev);
+	u8 reg;
+
+	switch (chan->channel2) {
+	case IIO_MOD_TEMP_AMBIENT:
+		if (dir == IIO_EV_DIR_RISING)
+			reg = TMP007_TDIE_HIGH_LIMIT;
+		else
+			reg = TMP007_TDIE_LOW_LIMIT;
+		break;
+	case IIO_MOD_TEMP_OBJECT:
+		if (dir == IIO_EV_DIR_RISING)
+			reg = TMP007_TOBJ_HIGH_LIMIT;
+		else
+			reg = TMP007_TOBJ_LOW_LIMIT;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* Full scale threshold value is +/- 256 degree Celsius */
+	if (val < -256 || val > 255)
+		return -EINVAL;
+
+	/* Shift length 7 bits = 6(15:6) + 1(0.5 LSB) */
+	return i2c_smbus_write_word_swapped(data->client, reg, (val << 7));
+}
+
+static IIO_CONST_ATTR(sampling_frequency_available, "4 2 1 0.5 0.25");
+
+static struct attribute *tmp007_attributes[] = {
+	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group tmp007_attribute_group = {
+	.attrs = tmp007_attributes,
+};
+
+static const struct iio_event_spec tmp007_obj_event[] = {
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_RISING,
+		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
+			BIT(IIO_EV_INFO_ENABLE),
+	},
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_FALLING,
+		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
+			BIT(IIO_EV_INFO_ENABLE),
+	},
+};
+
+static const struct iio_event_spec tmp007_die_event[] = {
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_RISING,
+		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
+			BIT(IIO_EV_INFO_ENABLE),
+	},
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_FALLING,
+		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
+			BIT(IIO_EV_INFO_ENABLE),
+	},
+};
+
+static const struct iio_chan_spec tmp007_channels[] = {
+	{
+		.type = IIO_TEMP,
+		.modified = 1,
+		.channel2 = IIO_MOD_TEMP_AMBIENT,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				BIT(IIO_CHAN_INFO_SCALE),
+		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+		.event_spec = tmp007_die_event,
+		.num_event_specs = ARRAY_SIZE(tmp007_die_event),
+	},
+	{
+		.type = IIO_TEMP,
+		.modified = 1,
+		.channel2 = IIO_MOD_TEMP_OBJECT,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				BIT(IIO_CHAN_INFO_SCALE),
+		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+		.event_spec = tmp007_obj_event,
+		.num_event_specs = ARRAY_SIZE(tmp007_obj_event),
+	}
+};
+
+static const struct iio_info tmp007_info = {
+	.read_raw = tmp007_read_raw,
+	.write_raw = tmp007_write_raw,
+	.read_event_config = tmp007_read_event_config,
+	.write_event_config = tmp007_write_event_config,
+	.read_event_value = tmp007_read_thresh,
+	.write_event_value = tmp007_write_thresh,
+	.attrs = &tmp007_attribute_group,
+};
+
+static bool tmp007_identify(struct i2c_client *client)
+{
+	int manf_id, dev_id;
+
+	manf_id = i2c_smbus_read_word_swapped(client, TMP007_MANUFACTURER_ID);
+	if (manf_id < 0)
+		return false;
+
+	dev_id = i2c_smbus_read_word_swapped(client, TMP007_DEVICE_ID);
+	if (dev_id < 0)
+		return false;
+
+	return (manf_id == TMP007_MANUFACTURER_MAGIC && dev_id == TMP007_DEVICE_MAGIC);
+}
+
+static void tmp007_powerdown_action_cb(void *priv)
+{
+	struct tmp007_data *data = priv;
+
+	tmp007_powerdown(data);
+}
+
+static int tmp007_probe(struct i2c_client *client)
+{
+	const struct i2c_device_id *tmp007_id = i2c_client_get_device_id(client);
+	struct tmp007_data *data;
+	struct iio_dev *indio_dev;
+	int ret;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
+		return -EOPNOTSUPP;
+
+	if (!tmp007_identify(client)) {
+		dev_err(&client->dev, "TMP007 not found\n");
+		return -ENODEV;
+	}
+
+	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	data = iio_priv(indio_dev);
+	i2c_set_clientdata(client, indio_dev);
+	data->client = client;
+	mutex_init(&data->lock);
+
+	indio_dev->name = "tmp007";
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->info = &tmp007_info;
+
+	indio_dev->channels = tmp007_channels;
+	indio_dev->num_channels = ARRAY_SIZE(tmp007_channels);
+
+	/*
+	 * Set Configuration register:
+	 * 1. Conversion ON
+	 * 2. ALERT enable
+	 * 3. Transient correction enable
+	 */
+
+	ret = i2c_smbus_read_word_swapped(data->client, TMP007_CONFIG);
+	if (ret < 0)
+		return ret;
+
+	data->config = ret;
+	data->config |= (TMP007_CONFIG_CONV_EN | TMP007_CONFIG_ALERT_EN | TMP007_CONFIG_TC_EN);
+
+	ret = i2c_smbus_write_word_swapped(data->client, TMP007_CONFIG,
+					data->config);
+	if (ret < 0)
+		return ret;
+
+	ret = devm_add_action_or_reset(&client->dev, tmp007_powerdown_action_cb, data);
+	if (ret)
+		return ret;
+
+	/*
+	 * Only the following flags can activate ALERT pin. Data conversion/validity flags
+	 * flags can still be polled for getting temperature data
+	 *
+	 * Set Status Mask register:
+	 * 1. Object temperature high limit enable
+	 * 2. Object temperature low limit enable
+	 * 3. TDIE temperature high limit enable
+	 * 4. TDIE temperature low limit enable
+	 */
+
+	ret = i2c_smbus_read_word_swapped(data->client, TMP007_STATUS_MASK);
+	if (ret < 0)
+		return ret;
+
+	data->status_mask = ret;
+	data->status_mask |= (TMP007_STATUS_OHF | TMP007_STATUS_OLF
+				| TMP007_STATUS_LHF | TMP007_STATUS_LLF);
+
+	ret = i2c_smbus_write_word_swapped(data->client, TMP007_STATUS_MASK, data->status_mask);
+	if (ret < 0)
+		return ret;
+
+	if (client->irq) {
+		ret = devm_request_threaded_irq(&client->dev, client->irq,
+				NULL, tmp007_interrupt_handler,
+				IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+				tmp007_id->name, indio_dev);
+		if (ret)
+			return ret;
+	}
+
+	return devm_iio_device_register(&client->dev, indio_dev);
+}
+
+static int tmp007_suspend(struct device *dev)
+{
+	struct tmp007_data *data = iio_priv(i2c_get_clientdata(
+			to_i2c_client(dev)));
+
+	return tmp007_powerdown(data);
+}
+
+static int tmp007_resume(struct device *dev)
+{
+	struct tmp007_data *data = iio_priv(i2c_get_clientdata(
+			to_i2c_client(dev)));
+
+	return i2c_smbus_write_word_swapped(data->client, TMP007_CONFIG,
+			data->config | TMP007_CONFIG_CONV_EN);
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(tmp007_pm_ops, tmp007_suspend, tmp007_resume);
+
+static const struct of_device_id tmp007_of_match[] = {
+	{ .compatible = "ti,tmp007", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, tmp007_of_match);
+
+static const struct i2c_device_id tmp007_id[] = {
+	{ .name = "tmp007" },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, tmp007_id);
+
+static struct i2c_driver tmp007_driver = {
+	.driver = {
+		.name	= "tmp007",
+		.of_match_table = tmp007_of_match,
+		.pm	= pm_sleep_ptr(&tmp007_pm_ops),
+	},
+	.probe		= tmp007_probe,
+	.id_table	= tmp007_id,
+};
+module_i2c_driver(tmp007_driver);
+
+MODULE_AUTHOR("Manivannan Sadhasivam <manivannanece23@gmail.com>");
+MODULE_DESCRIPTION("TI TMP007 IR thermopile sensor driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/iio/temperature/tmp117.c b/drivers/iio/temperature/tmp117.c
new file mode 100644
index 000000000..74cb8d62b
--- /dev/null
+++ b/drivers/iio/temperature/tmp117.c
@@ -0,0 +1,243 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Digital temperature sensor with integrated Non-volatile memory
+ * Copyright (c) 2021 Puranjay Mohan <puranjay12@gmail.com>
+ *
+ * Driver for the Texas Instruments TMP117 Temperature Sensor
+ * (7-bit I2C slave address (0x48 - 0x4B), changeable via ADD pins)
+ *
+ * Note: This driver assumes that the sensor has been calibrated beforehand.
+ */
+
+#include <linux/array_size.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/bitops.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/limits.h>
+#include <linux/property.h>
+#include <linux/regulator/consumer.h>
+
+#include <linux/iio/iio.h>
+
+#define TMP117_REG_TEMP			0x0
+#define TMP117_REG_CFGR			0x1
+#define TMP117_REG_HIGH_LIM		0x2
+#define TMP117_REG_LOW_LIM		0x3
+#define TMP117_REG_EEPROM_UL		0x4
+#define TMP117_REG_EEPROM1		0x5
+#define TMP117_REG_EEPROM2		0x6
+#define TMP117_REG_TEMP_OFFSET		0x7
+#define TMP117_REG_EEPROM3		0x8
+#define TMP117_REG_DEVICE_ID		0xF
+
+#define TMP117_RESOLUTION_10UC		78125
+#define MICRODEGREE_PER_10MILLIDEGREE	10000
+
+#define TMP116_DEVICE_ID		0x1116
+#define TMP117_DEVICE_ID		0x0117
+#define TMP119_DEVICE_ID		0x2117
+
+struct tmp117_data {
+	struct i2c_client *client;
+	s16 calibbias;
+};
+
+struct tmp11x_info {
+	const char *name;
+	struct iio_chan_spec const *channels;
+	int num_channels;
+};
+
+static int tmp117_read_raw(struct iio_dev *indio_dev,
+			   struct iio_chan_spec const *channel, int *val,
+			   int *val2, long mask)
+{
+	struct tmp117_data *data = iio_priv(indio_dev);
+	s32 ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		ret = i2c_smbus_read_word_swapped(data->client,
+						  TMP117_REG_TEMP);
+		if (ret < 0)
+			return ret;
+		*val = sign_extend32(ret, 15);
+		return IIO_VAL_INT;
+
+	case IIO_CHAN_INFO_CALIBBIAS:
+		ret = i2c_smbus_read_word_swapped(data->client,
+						  TMP117_REG_TEMP_OFFSET);
+		if (ret < 0)
+			return ret;
+		*val = sign_extend32(ret, 15);
+		return IIO_VAL_INT;
+
+	case IIO_CHAN_INFO_SCALE:
+		/*
+		 * Conversion from 10s of uC to mC
+		 * as IIO reports temperature in mC
+		 */
+		*val = TMP117_RESOLUTION_10UC / MICRODEGREE_PER_10MILLIDEGREE;
+		*val2 = (TMP117_RESOLUTION_10UC %
+					MICRODEGREE_PER_10MILLIDEGREE) * 100;
+
+		return IIO_VAL_INT_PLUS_MICRO;
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static int tmp117_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec
+			    const *channel, int val, int val2, long mask)
+{
+	struct tmp117_data *data = iio_priv(indio_dev);
+	s16 off;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_CALIBBIAS:
+		off = clamp_t(int, val, S16_MIN, S16_MAX);
+		if (off == data->calibbias)
+			return 0;
+		data->calibbias = off;
+		return i2c_smbus_write_word_swapped(data->client,
+						TMP117_REG_TEMP_OFFSET, off);
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct iio_chan_spec tmp117_channels[] = {
+	{
+		.type = IIO_TEMP,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_CALIBBIAS) |
+				      BIT(IIO_CHAN_INFO_SCALE),
+	},
+};
+
+static const struct iio_chan_spec tmp116_channels[] = {
+	{
+		.type = IIO_TEMP,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE),
+	},
+};
+
+static const struct tmp11x_info tmp116_channels_info = {
+	.name = "tmp116",
+	.channels = tmp116_channels,
+	.num_channels = ARRAY_SIZE(tmp116_channels)
+};
+
+static const struct tmp11x_info tmp117_channels_info = {
+	.name = "tmp117",
+	.channels = tmp117_channels,
+	.num_channels = ARRAY_SIZE(tmp117_channels)
+};
+
+static const struct tmp11x_info tmp119_channels_info = {
+	.name = "tmp119",
+	.channels = tmp117_channels,
+	.num_channels = ARRAY_SIZE(tmp117_channels)
+};
+
+static const struct iio_info tmp117_info = {
+	.read_raw = tmp117_read_raw,
+	.write_raw = tmp117_write_raw,
+};
+
+static int tmp117_probe(struct i2c_client *client)
+{
+	const struct tmp11x_info *match_data;
+	struct tmp117_data *data;
+	struct iio_dev *indio_dev;
+	int dev_id;
+	int ret;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
+		return -EOPNOTSUPP;
+
+	ret = devm_regulator_get_enable(&client->dev, "vcc");
+	if (ret)
+		return ret;
+
+	fsleep(1500);
+
+	dev_id = i2c_smbus_read_word_swapped(client, TMP117_REG_DEVICE_ID);
+	if (dev_id < 0)
+		return dev_id;
+
+	switch (dev_id) {
+	case TMP116_DEVICE_ID:
+		match_data = &tmp116_channels_info;
+		break;
+	case TMP117_DEVICE_ID:
+		match_data = &tmp117_channels_info;
+		break;
+	case TMP119_DEVICE_ID:
+		match_data = &tmp119_channels_info;
+		break;
+	default:
+		dev_info(&client->dev,
+			 "Unknown device id (0x%x), use fallback compatible\n",
+			 dev_id);
+		match_data = i2c_get_match_data(client);
+	}
+
+	if (!match_data)
+		return dev_err_probe(&client->dev, -ENODEV,
+				     "Failed to identify unsupported device\n");
+
+	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	data = iio_priv(indio_dev);
+	data->client = client;
+	data->calibbias = 0;
+
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->info = &tmp117_info;
+	indio_dev->channels = match_data->channels;
+	indio_dev->num_channels = match_data->num_channels;
+	indio_dev->name = match_data->name;
+
+
+	return devm_iio_device_register(&client->dev, indio_dev);
+}
+
+static const struct of_device_id tmp117_of_match[] = {
+	{ .compatible = "ti,tmp116", .data = &tmp116_channels_info },
+	{ .compatible = "ti,tmp117", .data = &tmp117_channels_info },
+	{ .compatible = "ti,tmp119", .data = &tmp119_channels_info },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, tmp117_of_match);
+
+static const struct i2c_device_id tmp117_id[] = {
+	{ .name = "tmp116", .driver_data = (kernel_ulong_t)&tmp116_channels_info },
+	{ .name = "tmp117", .driver_data = (kernel_ulong_t)&tmp117_channels_info },
+	{ .name = "tmp119", .driver_data = (kernel_ulong_t)&tmp119_channels_info },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, tmp117_id);
+
+static struct i2c_driver tmp117_driver = {
+	.driver = {
+		.name	= "tmp117",
+		.of_match_table = tmp117_of_match,
+	},
+	.probe		= tmp117_probe,
+	.id_table	= tmp117_id,
+};
+module_i2c_driver(tmp117_driver);
+
+MODULE_AUTHOR("Puranjay Mohan <puranjay12@gmail.com>");
+MODULE_DESCRIPTION("TI TMP117 Temperature sensor driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/iio/temperature/tsys01.c b/drivers/iio/temperature/tsys01.c
new file mode 100644
index 000000000..28b3ce022
--- /dev/null
+++ b/drivers/iio/temperature/tsys01.c
@@ -0,0 +1,234 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * tsys01.c - Support for Measurement-Specialties tsys01 temperature sensor
+ *
+ * Copyright (c) 2015 Measurement-Specialties
+ *
+ * Datasheet:
+ *  http://www.meas-spec.com/downloads/TSYS01_Digital_Temperature_Sensor.pdf
+ */
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/device.h>
+#include <linux/mutex.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/stat.h>
+#include "../common/ms_sensors/ms_sensors_i2c.h"
+
+/* TSYS01 Commands */
+#define TSYS01_RESET				0x1E
+#define TSYS01_CONVERSION_START			0x48
+#define TSYS01_ADC_READ				0x00
+#define TSYS01_PROM_READ			0xA0
+
+#define TSYS01_PROM_WORDS_NB			8
+
+struct tsys01_dev {
+	void *client;
+	struct mutex lock; /* lock during conversion */
+
+	int (*reset)(void *cli, u8 cmd, unsigned int delay);
+	int (*convert_and_read)(void *cli, u8 conv, u8 rd,
+				unsigned int delay, u32 *adc);
+	int (*read_prom_word)(void *cli, int cmd, u16 *word);
+
+	u16 prom[TSYS01_PROM_WORDS_NB];
+};
+
+/* Multiplication coefficients for temperature computation */
+static const int coeff_mul[] = { -1500000, 1000000, -2000000,
+				 4000000, -2000000 };
+
+static int tsys01_read_temperature(struct iio_dev *indio_dev,
+				   s32 *temperature)
+{
+	int ret, i;
+	u32 adc;
+	s64 temp = 0;
+	struct tsys01_dev *dev_data = iio_priv(indio_dev);
+
+	mutex_lock(&dev_data->lock);
+	ret = dev_data->convert_and_read(dev_data->client,
+					 TSYS01_CONVERSION_START,
+					 TSYS01_ADC_READ, 9000, &adc);
+	mutex_unlock(&dev_data->lock);
+	if (ret)
+		return ret;
+
+	adc >>= 8;
+
+	/* Temperature algorithm */
+	for (i = 4; i > 0; i--) {
+		temp += coeff_mul[i] *
+			(s64)dev_data->prom[5 - i];
+		temp *= (s64)adc;
+		temp = div64_s64(temp, 100000);
+	}
+	temp *= 10;
+	temp += coeff_mul[0] * (s64)dev_data->prom[5];
+	temp = div64_s64(temp, 100000);
+
+	*temperature = temp;
+
+	return 0;
+}
+
+static int tsys01_read_raw(struct iio_dev *indio_dev,
+			   struct iio_chan_spec const *channel, int *val,
+			   int *val2, long mask)
+{
+	int ret;
+	s32 temperature;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_PROCESSED:
+		switch (channel->type) {
+		case IIO_TEMP:	/* in milli °C */
+			ret = tsys01_read_temperature(indio_dev, &temperature);
+			if (ret)
+				return ret;
+			*val = temperature;
+
+			return IIO_VAL_INT;
+		default:
+			return -EINVAL;
+		}
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct iio_chan_spec tsys01_channels[] = {
+	{
+		.type = IIO_TEMP,
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_PROCESSED),
+	}
+};
+
+static const struct iio_info tsys01_info = {
+	.read_raw = tsys01_read_raw,
+};
+
+static bool tsys01_crc_valid(u16 *n_prom)
+{
+	u8 cnt;
+	u8 sum = 0;
+
+	for (cnt = 0; cnt < TSYS01_PROM_WORDS_NB; cnt++)
+		sum += ((n_prom[cnt] >> 8) + (n_prom[cnt] & 0xFF));
+
+	return (sum == 0);
+}
+
+static int tsys01_read_prom(struct iio_dev *indio_dev)
+{
+	int i, ret;
+	struct tsys01_dev *dev_data = iio_priv(indio_dev);
+	char buf[7 * TSYS01_PROM_WORDS_NB + 1];
+	char *ptr = buf;
+
+	for (i = 0; i < TSYS01_PROM_WORDS_NB; i++) {
+		ret = dev_data->read_prom_word(dev_data->client,
+					       TSYS01_PROM_READ + (i << 1),
+					       &dev_data->prom[i]);
+		if (ret)
+			return ret;
+
+		ret = sprintf(ptr, "0x%04x ", dev_data->prom[i]);
+		ptr += ret;
+	}
+
+	if (!tsys01_crc_valid(dev_data->prom)) {
+		dev_err(&indio_dev->dev, "prom crc check error\n");
+		return -ENODEV;
+	}
+	*ptr = 0;
+	dev_info(&indio_dev->dev, "PROM coefficients : %s\n", buf);
+
+	return 0;
+}
+
+static int tsys01_probe(struct iio_dev *indio_dev, struct device *dev)
+{
+	int ret;
+	struct tsys01_dev *dev_data = iio_priv(indio_dev);
+
+	mutex_init(&dev_data->lock);
+
+	indio_dev->info = &tsys01_info;
+	indio_dev->name = dev->driver->name;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = tsys01_channels;
+	indio_dev->num_channels = ARRAY_SIZE(tsys01_channels);
+
+	ret = dev_data->reset(dev_data->client, TSYS01_RESET, 3000);
+	if (ret)
+		return ret;
+
+	ret = tsys01_read_prom(indio_dev);
+	if (ret)
+		return ret;
+
+	return devm_iio_device_register(dev, indio_dev);
+}
+
+static int tsys01_i2c_probe(struct i2c_client *client)
+{
+	struct tsys01_dev *dev_data;
+	struct iio_dev *indio_dev;
+
+	if (!i2c_check_functionality(client->adapter,
+				     I2C_FUNC_SMBUS_WORD_DATA |
+				     I2C_FUNC_SMBUS_WRITE_BYTE |
+				     I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
+		dev_err(&client->dev,
+			"Adapter does not support some i2c transaction\n");
+		return -EOPNOTSUPP;
+	}
+
+	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	dev_data = iio_priv(indio_dev);
+	dev_data->client = client;
+	dev_data->reset = ms_sensors_reset;
+	dev_data->read_prom_word = ms_sensors_read_prom_word;
+	dev_data->convert_and_read = ms_sensors_convert_and_read;
+
+	i2c_set_clientdata(client, indio_dev);
+
+	return tsys01_probe(indio_dev, &client->dev);
+}
+
+static const struct i2c_device_id tsys01_id[] = {
+	{ .name = "tsys01" },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, tsys01_id);
+
+static const struct of_device_id tsys01_of_match[] = {
+	{ .compatible = "meas,tsys01", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, tsys01_of_match);
+
+static struct i2c_driver tsys01_driver = {
+	.probe = tsys01_i2c_probe,
+	.id_table = tsys01_id,
+	.driver = {
+		   .name = "tsys01",
+		   .of_match_table = tsys01_of_match,
+		   },
+};
+
+module_i2c_driver(tsys01_driver);
+
+MODULE_DESCRIPTION("Measurement-Specialties tsys01 temperature driver");
+MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>");
+MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_IMPORT_NS("IIO_MEAS_SPEC_SENSORS");
diff --git a/drivers/iio/temperature/tsys02d.c b/drivers/iio/temperature/tsys02d.c
new file mode 100644
index 000000000..3ef723474
--- /dev/null
+++ b/drivers/iio/temperature/tsys02d.c
@@ -0,0 +1,190 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * tsys02d.c - Support for Measurement-Specialties tsys02d temperature sensor
+ *
+ * Copyright (c) 2015 Measurement-Specialties
+ *
+ * (7-bit I2C slave address 0x40)
+ *
+ * Datasheet:
+ *  http://www.meas-spec.com/downloads/Digital_Sensor_TSYS02D.pdf
+ */
+
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/stat.h>
+#include <linux/module.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#include "../common/ms_sensors/ms_sensors_i2c.h"
+
+#define TSYS02D_RESET				0xFE
+
+static const int tsys02d_samp_freq[4] = { 20, 40, 70, 140 };
+/* String copy of the above const for readability purpose */
+static const char tsys02d_show_samp_freq[] = "20 40 70 140";
+
+static int tsys02d_read_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *channel, int *val,
+			    int *val2, long mask)
+{
+	int ret;
+	s32 temperature;
+	struct ms_ht_dev *dev_data = iio_priv(indio_dev);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_PROCESSED:
+		switch (channel->type) {
+		case IIO_TEMP:	/* in milli °C */
+			ret = ms_sensors_ht_read_temperature(dev_data,
+							     &temperature);
+			if (ret)
+				return ret;
+			*val = temperature;
+
+			return IIO_VAL_INT;
+		default:
+			return -EINVAL;
+		}
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		*val = tsys02d_samp_freq[dev_data->res_index];
+
+		return IIO_VAL_INT;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int tsys02d_write_raw(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *chan,
+			     int val, int val2, long mask)
+{
+	struct ms_ht_dev *dev_data = iio_priv(indio_dev);
+	int i, ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		i = ARRAY_SIZE(tsys02d_samp_freq);
+		while (i-- > 0)
+			if (val == tsys02d_samp_freq[i])
+				break;
+		if (i < 0)
+			return -EINVAL;
+		mutex_lock(&dev_data->lock);
+		dev_data->res_index = i;
+		ret = ms_sensors_write_resolution(dev_data, i);
+		mutex_unlock(&dev_data->lock);
+
+		return ret;
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct iio_chan_spec tsys02d_channels[] = {
+	{
+		.type = IIO_TEMP,
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_PROCESSED),
+		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+	}
+};
+
+static ssize_t tsys02_read_battery_low(struct device *dev,
+				       struct device_attribute *attr,
+				       char *buf)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct ms_ht_dev *dev_data = iio_priv(indio_dev);
+
+	return ms_sensors_show_battery_low(dev_data, buf);
+}
+
+static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(tsys02d_show_samp_freq);
+static IIO_DEVICE_ATTR(battery_low, S_IRUGO,
+		       tsys02_read_battery_low, NULL, 0);
+
+static struct attribute *tsys02d_attributes[] = {
+	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
+	&iio_dev_attr_battery_low.dev_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group tsys02d_attribute_group = {
+	.attrs = tsys02d_attributes,
+};
+
+static const struct iio_info tsys02d_info = {
+	.read_raw = tsys02d_read_raw,
+	.write_raw = tsys02d_write_raw,
+	.attrs = &tsys02d_attribute_group,
+};
+
+static int tsys02d_probe(struct i2c_client *client)
+{
+	const struct i2c_device_id *id = i2c_client_get_device_id(client);
+	struct ms_ht_dev *dev_data;
+	struct iio_dev *indio_dev;
+	int ret;
+	u64 serial_number;
+
+	if (!i2c_check_functionality(client->adapter,
+				     I2C_FUNC_SMBUS_WRITE_BYTE_DATA |
+				     I2C_FUNC_SMBUS_WRITE_BYTE |
+				     I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
+		dev_err(&client->dev,
+			"Adapter does not support some i2c transaction\n");
+		return -EOPNOTSUPP;
+	}
+
+	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	dev_data = iio_priv(indio_dev);
+	dev_data->client = client;
+	dev_data->res_index = 0;
+	mutex_init(&dev_data->lock);
+
+	indio_dev->info = &tsys02d_info;
+	indio_dev->name = id->name;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = tsys02d_channels;
+	indio_dev->num_channels = ARRAY_SIZE(tsys02d_channels);
+
+	i2c_set_clientdata(client, indio_dev);
+
+	ret = ms_sensors_reset(client, TSYS02D_RESET, 15000);
+	if (ret)
+		return ret;
+
+	ret = ms_sensors_read_serial(client, &serial_number);
+	if (ret)
+		return ret;
+	dev_info(&client->dev, "Serial number : %llx", serial_number);
+
+	return devm_iio_device_register(&client->dev, indio_dev);
+}
+
+static const struct i2c_device_id tsys02d_id[] = {
+	{ .name = "tsys02d" },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, tsys02d_id);
+
+static struct i2c_driver tsys02d_driver = {
+	.probe = tsys02d_probe,
+	.id_table = tsys02d_id,
+	.driver = {
+		   .name = "tsys02d",
+		   },
+};
+
+module_i2c_driver(tsys02d_driver);
+
+MODULE_DESCRIPTION("Measurement-Specialties tsys02d temperature driver");
+MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>");
+MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_IMPORT_NS("IIO_MEAS_SPEC_SENSORS");