Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linuxgrafted

Pull I3C updates from Alexandre Belloni:
 "A new driver this cycle, for the AMD AXI I3C controller.

  There are also new features such as IBI wakeup support, SETAASA device
  discovery and ACPI support for the the DAA methods, meaning we can now
  communicate with the SPD devices on DDR5 modules.

  New driver:
   - AMD AXI I3C master controller

  Subsystem:
   - I3C Common Command Code (CCC) handling improvements, especially
     around GET CCCs
   - SETAASA device discovery support
   - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as
     well as I2C devices on I3C bus
   - IBI-based wakeup support

  Drivers:
   - dw: SETAASA support
   - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C
     controller support, PIO queue management support for HCI v1.2
   - renesas: improve suspend to RAM support, add runtime PM support"

* tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits)
  i3c: dw: reduce do_daa time if there's no client
  i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller
  i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2
  i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode
  i3c: dw: rename "pclk" to "apb" to match dt-binding
  i3c: dw: make struct dw_i3c_cmd smaller
  i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding
  i3c: renesas: Don't register devices when ENTDAA times out
  i3c: master: dw-i3c-master: fix OD timing for first broadcast
  i3c: mipi-i3c-hci: Advertise IBI wakeup capability
  i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev()
  i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI
  i3c: master: Reject IBI requests from non-IBI-capable devices
  i3c: master: Add helper to query bus wakeup requirements
  i3c: master: Report wakeup events for IBIs
  i3c: master: Support IBI-based wakeup capability
  i3c: master: Fix potential UAF in i3c_device_match()
  i3c: master: Fix potential UAF in i3c_device_uevent()
  i3c: Make dev->desc locking assumptions explicit
  i3c: master: Fix use-after-free of master->this
  ...

1 files changed, 862 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/stmfts.c b/drivers/input/touchscreen/stmfts.c
new file mode 100644
index 000000000..972687797
--- /dev/null
+++ b/drivers/input/touchscreen/stmfts.c
@@ -0,0 +1,862 @@
+// SPDX-License-Identifier: GPL-2.0
+// STMicroelectronics FTS Touchscreen device driver
+//
+// Copyright (c) 2017 Samsung Electronics Co., Ltd.
+// Copyright (c) 2017 Andi Shyti <andi@etezian.org>
+
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/input/mt.h>
+#include <linux/input/touchscreen.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
+
+/* I2C commands */
+#define STMFTS_READ_INFO			0x80
+#define STMFTS_READ_STATUS			0x84
+#define STMFTS_READ_ONE_EVENT			0x85
+#define STMFTS_READ_ALL_EVENT			0x86
+#define STMFTS_LATEST_EVENT			0x87
+#define STMFTS_SLEEP_IN				0x90
+#define STMFTS_SLEEP_OUT			0x91
+#define STMFTS_MS_MT_SENSE_OFF			0x92
+#define STMFTS_MS_MT_SENSE_ON			0x93
+#define STMFTS_SS_HOVER_SENSE_OFF		0x94
+#define STMFTS_SS_HOVER_SENSE_ON		0x95
+#define STMFTS_MS_KEY_SENSE_OFF			0x9a
+#define STMFTS_MS_KEY_SENSE_ON			0x9b
+#define STMFTS_SYSTEM_RESET			0xa0
+#define STMFTS_CLEAR_EVENT_STACK		0xa1
+#define STMFTS_FULL_FORCE_CALIBRATION		0xa2
+#define STMFTS_MS_CX_TUNING			0xa3
+#define STMFTS_SS_CX_TUNING			0xa4
+
+/* events */
+#define STMFTS_EV_NO_EVENT			0x00
+#define STMFTS_EV_MULTI_TOUCH_DETECTED		0x02
+#define STMFTS_EV_MULTI_TOUCH_ENTER		0x03
+#define STMFTS_EV_MULTI_TOUCH_LEAVE		0x04
+#define STMFTS_EV_MULTI_TOUCH_MOTION		0x05
+#define STMFTS_EV_HOVER_ENTER			0x07
+#define STMFTS_EV_HOVER_LEAVE			0x08
+#define STMFTS_EV_HOVER_MOTION			0x09
+#define STMFTS_EV_KEY_STATUS			0x0e
+#define STMFTS_EV_ERROR				0x0f
+#define STMFTS_EV_CONTROLLER_READY		0x10
+#define STMFTS_EV_SLEEP_OUT_CONTROLLER_READY	0x11
+#define STMFTS_EV_STATUS			0x16
+#define STMFTS_EV_DEBUG				0xdb
+
+/* multi touch related event masks */
+#define STMFTS_MASK_EVENT_ID			0x0f
+#define STMFTS_MASK_TOUCH_ID			0xf0
+#define STMFTS_MASK_LEFT_EVENT			0x0f
+#define STMFTS_MASK_X_MSB			0x0f
+#define STMFTS_MASK_Y_LSB			0xf0
+
+/* key related event masks */
+#define STMFTS_MASK_KEY_NO_TOUCH		0x00
+#define STMFTS_MASK_KEY_MENU			0x01
+#define STMFTS_MASK_KEY_BACK			0x02
+
+#define STMFTS_EVENT_SIZE	8
+#define STMFTS_STACK_DEPTH	32
+#define STMFTS_DATA_MAX_SIZE	(STMFTS_EVENT_SIZE * STMFTS_STACK_DEPTH)
+#define STMFTS_MAX_FINGERS	10
+#define STMFTS_DEV_NAME		"stmfts"
+
+static const struct regulator_bulk_data stmfts_supplies[] = {
+	{ .supply = "vdd" },
+	{ .supply = "avdd" },
+};
+
+struct stmfts_data {
+	struct i2c_client *client;
+	struct input_dev *input;
+	struct gpio_desc *reset_gpio;
+	struct led_classdev led_cdev;
+	struct mutex mutex;
+
+	struct touchscreen_properties prop;
+
+	struct regulator_bulk_data *supplies;
+
+	/*
+	 * Presence of ledvdd will be used also to check
+	 * whether the LED is supported.
+	 */
+	struct regulator *ledvdd;
+
+	u16 chip_id;
+	u8 chip_ver;
+	u16 fw_ver;
+	u8 config_id;
+	u8 config_ver;
+
+	u8 data[STMFTS_DATA_MAX_SIZE];
+
+	struct completion cmd_done;
+
+	bool use_key;
+	bool led_status;
+	bool hover_enabled;
+	bool running;
+};
+
+static int stmfts_brightness_set(struct led_classdev *led_cdev,
+				 enum led_brightness value)
+{
+	struct stmfts_data *sdata = container_of(led_cdev,
+					struct stmfts_data, led_cdev);
+	int err;
+
+	if (value != sdata->led_status && sdata->ledvdd) {
+		if (!value) {
+			regulator_disable(sdata->ledvdd);
+		} else {
+			err = regulator_enable(sdata->ledvdd);
+			if (err) {
+				dev_warn(&sdata->client->dev,
+					 "failed to enable ledvdd regulator: %d\n",
+					 err);
+				return err;
+			}
+		}
+		sdata->led_status = value;
+	}
+
+	return 0;
+}
+
+static enum led_brightness stmfts_brightness_get(struct led_classdev *led_cdev)
+{
+	struct stmfts_data *sdata = container_of(led_cdev,
+						struct stmfts_data, led_cdev);
+
+	return !!regulator_is_enabled(sdata->ledvdd);
+}
+
+/*
+ * We can't simply use i2c_smbus_read_i2c_block_data because we
+ * need to read 256 bytes, which exceeds the 255-byte SMBus block limit.
+ */
+static int stmfts_read_events(struct stmfts_data *sdata)
+{
+	u8 cmd = STMFTS_READ_ALL_EVENT;
+	struct i2c_msg msgs[2] = {
+		{
+			.addr	= sdata->client->addr,
+			.len	= 1,
+			.buf	= &cmd,
+		},
+		{
+			.addr	= sdata->client->addr,
+			.flags	= I2C_M_RD,
+			.len	= STMFTS_DATA_MAX_SIZE,
+			.buf	= sdata->data,
+		},
+	};
+	int ret;
+
+	ret = i2c_transfer(sdata->client->adapter, msgs, ARRAY_SIZE(msgs));
+	if (ret < 0)
+		return ret;
+
+	return ret == ARRAY_SIZE(msgs) ? 0 : -EIO;
+}
+
+static void stmfts_report_contact_event(struct stmfts_data *sdata,
+					const u8 event[])
+{
+	u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4;
+	u16 x = event[1] | ((event[2] & STMFTS_MASK_X_MSB) << 8);
+	u16 y = (event[2] >> 4) | (event[3] << 4);
+	u8 maj = event[4];
+	u8 min = event[5];
+	u8 orientation = event[6];
+	u8 area = event[7];
+
+	input_mt_slot(sdata->input, slot_id);
+
+	input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, true);
+	input_report_abs(sdata->input, ABS_MT_POSITION_X, x);
+	input_report_abs(sdata->input, ABS_MT_POSITION_Y, y);
+	input_report_abs(sdata->input, ABS_MT_TOUCH_MAJOR, maj);
+	input_report_abs(sdata->input, ABS_MT_TOUCH_MINOR, min);
+	input_report_abs(sdata->input, ABS_MT_PRESSURE, area);
+	input_report_abs(sdata->input, ABS_MT_ORIENTATION, orientation);
+
+	input_sync(sdata->input);
+}
+
+static void stmfts_report_contact_release(struct stmfts_data *sdata,
+					  const u8 event[])
+{
+	u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4;
+
+	input_mt_slot(sdata->input, slot_id);
+	input_mt_report_slot_inactive(sdata->input);
+
+	input_sync(sdata->input);
+}
+
+static void stmfts_report_hover_event(struct stmfts_data *sdata,
+				      const u8 event[])
+{
+	u16 x = (event[2] << 4) | (event[4] >> 4);
+	u16 y = (event[3] << 4) | (event[4] & STMFTS_MASK_Y_LSB);
+	u8 z = event[5];
+
+	input_report_abs(sdata->input, ABS_X, x);
+	input_report_abs(sdata->input, ABS_Y, y);
+	input_report_abs(sdata->input, ABS_DISTANCE, z);
+
+	input_sync(sdata->input);
+}
+
+static void stmfts_report_key_event(struct stmfts_data *sdata, const u8 event[])
+{
+	switch (event[2]) {
+	case 0:
+		input_report_key(sdata->input, KEY_BACK, 0);
+		input_report_key(sdata->input, KEY_MENU, 0);
+		break;
+
+	case STMFTS_MASK_KEY_BACK:
+		input_report_key(sdata->input, KEY_BACK, 1);
+		break;
+
+	case STMFTS_MASK_KEY_MENU:
+		input_report_key(sdata->input, KEY_MENU, 1);
+		break;
+
+	default:
+		dev_warn(&sdata->client->dev,
+			 "unknown key event: %#02x\n", event[2]);
+		break;
+	}
+
+	input_sync(sdata->input);
+}
+
+static void stmfts_parse_events(struct stmfts_data *sdata)
+{
+	int i;
+
+	for (i = 0; i < STMFTS_STACK_DEPTH; i++) {
+		u8 *event = &sdata->data[i * STMFTS_EVENT_SIZE];
+
+		switch (event[0]) {
+		case STMFTS_EV_CONTROLLER_READY:
+		case STMFTS_EV_SLEEP_OUT_CONTROLLER_READY:
+		case STMFTS_EV_STATUS:
+			complete(&sdata->cmd_done);
+			fallthrough;
+
+		case STMFTS_EV_NO_EVENT:
+		case STMFTS_EV_DEBUG:
+			return;
+		}
+
+		switch (event[0] & STMFTS_MASK_EVENT_ID) {
+		case STMFTS_EV_MULTI_TOUCH_ENTER:
+		case STMFTS_EV_MULTI_TOUCH_MOTION:
+			stmfts_report_contact_event(sdata, event);
+			break;
+
+		case STMFTS_EV_MULTI_TOUCH_LEAVE:
+			stmfts_report_contact_release(sdata, event);
+			break;
+
+		case STMFTS_EV_HOVER_ENTER:
+		case STMFTS_EV_HOVER_LEAVE:
+		case STMFTS_EV_HOVER_MOTION:
+			stmfts_report_hover_event(sdata, event);
+			break;
+
+		case STMFTS_EV_KEY_STATUS:
+			stmfts_report_key_event(sdata, event);
+			break;
+
+		case STMFTS_EV_ERROR:
+			dev_warn(&sdata->client->dev,
+				 "error code: 0x%x%x%x%x%x%x",
+				 event[6], event[5], event[4],
+				 event[3], event[2], event[1]);
+			break;
+
+		default:
+			dev_err(&sdata->client->dev,
+				"unknown event %#02x\n", event[0]);
+		}
+	}
+}
+
+static irqreturn_t stmfts_irq_handler(int irq, void *dev)
+{
+	struct stmfts_data *sdata = dev;
+	int err;
+
+	guard(mutex)(&sdata->mutex);
+
+	err = stmfts_read_events(sdata);
+	if (unlikely(err))
+		dev_err(&sdata->client->dev,
+			"failed to read events: %d\n", err);
+	else
+		stmfts_parse_events(sdata);
+
+	return IRQ_HANDLED;
+}
+
+static int stmfts_command(struct stmfts_data *sdata, const u8 cmd)
+{
+	int err;
+
+	reinit_completion(&sdata->cmd_done);
+
+	err = i2c_smbus_write_byte(sdata->client, cmd);
+	if (err)
+		return err;
+
+	if (!wait_for_completion_timeout(&sdata->cmd_done,
+					 msecs_to_jiffies(1000)))
+		return -ETIMEDOUT;
+
+	return 0;
+}
+
+static int stmfts_input_open(struct input_dev *dev)
+{
+	struct stmfts_data *sdata = input_get_drvdata(dev);
+	int err;
+
+	err = pm_runtime_resume_and_get(&sdata->client->dev);
+	if (err)
+		return err;
+
+	err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_ON);
+	if (err) {
+		pm_runtime_put_sync(&sdata->client->dev);
+		return err;
+	}
+
+	scoped_guard(mutex, &sdata->mutex) {
+		sdata->running = true;
+
+		if (sdata->hover_enabled) {
+			err = i2c_smbus_write_byte(sdata->client,
+						   STMFTS_SS_HOVER_SENSE_ON);
+			if (err)
+				dev_warn(&sdata->client->dev,
+					 "failed to enable hover\n");
+		}
+	}
+
+	if (sdata->use_key) {
+		err = i2c_smbus_write_byte(sdata->client,
+					   STMFTS_MS_KEY_SENSE_ON);
+		if (err)
+			/* I can still use only the touch screen */
+			dev_warn(&sdata->client->dev,
+				 "failed to enable touchkey\n");
+	}
+
+	return 0;
+}
+
+static void stmfts_input_close(struct input_dev *dev)
+{
+	struct stmfts_data *sdata = input_get_drvdata(dev);
+	int err;
+
+	err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_OFF);
+	if (err)
+		dev_warn(&sdata->client->dev,
+			 "failed to disable touchscreen: %d\n", err);
+
+	scoped_guard(mutex, &sdata->mutex) {
+		sdata->running = false;
+
+		if (sdata->hover_enabled) {
+			err = i2c_smbus_write_byte(sdata->client,
+						   STMFTS_SS_HOVER_SENSE_OFF);
+			if (err)
+				dev_warn(&sdata->client->dev,
+					 "failed to disable hover: %d\n", err);
+		}
+	}
+
+	if (sdata->use_key) {
+		err = i2c_smbus_write_byte(sdata->client,
+					   STMFTS_MS_KEY_SENSE_OFF);
+		if (err)
+			dev_warn(&sdata->client->dev,
+				 "failed to disable touchkey: %d\n", err);
+	}
+
+	pm_runtime_put_sync(&sdata->client->dev);
+}
+
+static ssize_t stmfts_sysfs_chip_id(struct device *dev,
+				    struct device_attribute *attr, char *buf)
+{
+	struct stmfts_data *sdata = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%#x\n", sdata->chip_id);
+}
+
+static ssize_t stmfts_sysfs_chip_version(struct device *dev,
+					 struct device_attribute *attr,
+					 char *buf)
+{
+	struct stmfts_data *sdata = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%u\n", sdata->chip_ver);
+}
+
+static ssize_t stmfts_sysfs_fw_ver(struct device *dev,
+				   struct device_attribute *attr, char *buf)
+{
+	struct stmfts_data *sdata = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%u\n", sdata->fw_ver);
+}
+
+static ssize_t stmfts_sysfs_config_id(struct device *dev,
+				      struct device_attribute *attr, char *buf)
+{
+	struct stmfts_data *sdata = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%#x\n", sdata->config_id);
+}
+
+static ssize_t stmfts_sysfs_config_version(struct device *dev,
+					   struct device_attribute *attr,
+					   char *buf)
+{
+	struct stmfts_data *sdata = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%u\n", sdata->config_ver);
+}
+
+static ssize_t stmfts_sysfs_read_status(struct device *dev,
+					struct device_attribute *attr,
+					char *buf)
+{
+	struct stmfts_data *sdata = dev_get_drvdata(dev);
+	u8 status[4];
+	int err;
+
+	err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_STATUS,
+					    sizeof(status), status);
+	if (err)
+		return err;
+
+	return sysfs_emit(buf, "%#02x\n", status[0]);
+}
+
+static ssize_t stmfts_sysfs_hover_enable_read(struct device *dev,
+					      struct device_attribute *attr,
+					      char *buf)
+{
+	struct stmfts_data *sdata = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%u\n", sdata->hover_enabled);
+}
+
+static ssize_t stmfts_sysfs_hover_enable_write(struct device *dev,
+					       struct device_attribute *attr,
+					       const char *buf, size_t len)
+{
+	struct stmfts_data *sdata = dev_get_drvdata(dev);
+	unsigned long value;
+	bool hover;
+	int err;
+
+	if (kstrtoul(buf, 0, &value))
+		return -EINVAL;
+
+	hover = !!value;
+
+	guard(mutex)(&sdata->mutex);
+
+	if (hover != sdata->hover_enabled) {
+		if (sdata->running) {
+			err = i2c_smbus_write_byte(sdata->client,
+						   value ? STMFTS_SS_HOVER_SENSE_ON :
+							   STMFTS_SS_HOVER_SENSE_OFF);
+			if (err)
+				return err;
+		}
+
+		sdata->hover_enabled = hover;
+	}
+
+	return len;
+}
+
+static DEVICE_ATTR(chip_id, 0444, stmfts_sysfs_chip_id, NULL);
+static DEVICE_ATTR(chip_version, 0444, stmfts_sysfs_chip_version, NULL);
+static DEVICE_ATTR(fw_ver, 0444, stmfts_sysfs_fw_ver, NULL);
+static DEVICE_ATTR(config_id, 0444, stmfts_sysfs_config_id, NULL);
+static DEVICE_ATTR(config_version, 0444, stmfts_sysfs_config_version, NULL);
+static DEVICE_ATTR(status, 0444, stmfts_sysfs_read_status, NULL);
+static DEVICE_ATTR(hover_enable, 0644, stmfts_sysfs_hover_enable_read,
+					stmfts_sysfs_hover_enable_write);
+
+static struct attribute *stmfts_sysfs_attrs[] = {
+	&dev_attr_chip_id.attr,
+	&dev_attr_chip_version.attr,
+	&dev_attr_fw_ver.attr,
+	&dev_attr_config_id.attr,
+	&dev_attr_config_version.attr,
+	&dev_attr_status.attr,
+	&dev_attr_hover_enable.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(stmfts_sysfs);
+
+static int stmfts_read_system_info(struct stmfts_data *sdata)
+{
+	int err;
+	u8 reg[8];
+
+	err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_INFO,
+					    sizeof(reg), reg);
+	if (err < 0)
+		return err;
+	if (err != sizeof(reg))
+		return -EIO;
+
+	sdata->chip_id = be16_to_cpup((__be16 *)&reg[6]);
+	sdata->chip_ver = reg[0];
+	sdata->fw_ver = be16_to_cpup((__be16 *)&reg[2]);
+	sdata->config_id = reg[4];
+	sdata->config_ver = reg[5];
+
+	return 0;
+}
+
+static void stmfts_reset(struct stmfts_data *sdata)
+{
+	gpiod_set_value_cansleep(sdata->reset_gpio, 1);
+	msleep(20);
+
+	gpiod_set_value_cansleep(sdata->reset_gpio, 0);
+	msleep(50);
+}
+
+static int stmfts_configure(struct stmfts_data *sdata)
+{
+	int err;
+
+	err = stmfts_command(sdata, STMFTS_SYSTEM_RESET);
+	if (err)
+		return err;
+
+	err = stmfts_command(sdata, STMFTS_SLEEP_OUT);
+	if (err)
+		return err;
+
+	/* optional tuning */
+	err = stmfts_command(sdata, STMFTS_MS_CX_TUNING);
+	if (err)
+		dev_warn(&sdata->client->dev,
+			 "failed to perform mutual auto tune: %d\n", err);
+
+	/* optional tuning */
+	err = stmfts_command(sdata, STMFTS_SS_CX_TUNING);
+	if (err)
+		dev_warn(&sdata->client->dev,
+			 "failed to perform self auto tune: %d\n", err);
+
+	err = stmfts_command(sdata, STMFTS_FULL_FORCE_CALIBRATION);
+	if (err)
+		return err;
+
+	return 0;
+}
+
+static int stmfts_power_on(struct stmfts_data *sdata)
+{
+	int err;
+
+	err = regulator_bulk_enable(ARRAY_SIZE(stmfts_supplies),
+				    sdata->supplies);
+	if (err)
+		return err;
+
+	/*
+	 * The datasheet does not specify the power on time, but considering
+	 * that the reset time is < 10ms, I sleep 20ms to be sure
+	 */
+	msleep(20);
+
+	if (sdata->reset_gpio)
+		stmfts_reset(sdata);
+
+	err = stmfts_read_system_info(sdata);
+	if (err)
+		goto err_disable_regulators;
+
+	enable_irq(sdata->client->irq);
+
+	msleep(50);
+
+	err = stmfts_configure(sdata);
+	if (err)
+		goto err_disable_irq;
+
+	/*
+	 * At this point no one is using the touchscreen
+	 * and I don't really care about the return value
+	 */
+	(void)i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN);
+
+	return 0;
+
+err_disable_irq:
+	disable_irq(sdata->client->irq);
+err_disable_regulators:
+	regulator_bulk_disable(ARRAY_SIZE(stmfts_supplies), sdata->supplies);
+	return err;
+}
+
+static void stmfts_power_off(void *data)
+{
+	struct stmfts_data *sdata = data;
+
+	disable_irq(sdata->client->irq);
+
+	if (sdata->reset_gpio)
+		gpiod_set_value_cansleep(sdata->reset_gpio, 1);
+
+	regulator_bulk_disable(ARRAY_SIZE(stmfts_supplies), sdata->supplies);
+}
+
+static int stmfts_enable_led(struct stmfts_data *sdata)
+{
+	int err;
+
+	/* get the regulator for powering the leds on */
+	sdata->ledvdd = devm_regulator_get(&sdata->client->dev, "ledvdd");
+	if (IS_ERR(sdata->ledvdd))
+		return PTR_ERR(sdata->ledvdd);
+
+	sdata->led_cdev.name = STMFTS_DEV_NAME;
+	sdata->led_cdev.max_brightness = LED_ON;
+	sdata->led_cdev.brightness = LED_OFF;
+	sdata->led_cdev.brightness_set_blocking = stmfts_brightness_set;
+	sdata->led_cdev.brightness_get = stmfts_brightness_get;
+
+	err = devm_led_classdev_register(&sdata->client->dev, &sdata->led_cdev);
+	if (err) {
+		devm_regulator_put(sdata->ledvdd);
+		return err;
+	}
+
+	return 0;
+}
+
+static int stmfts_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	int err;
+	struct stmfts_data *sdata;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
+						I2C_FUNC_SMBUS_BYTE_DATA |
+						I2C_FUNC_SMBUS_I2C_BLOCK))
+		return -ENODEV;
+
+	sdata = devm_kzalloc(dev, sizeof(*sdata), GFP_KERNEL);
+	if (!sdata)
+		return -ENOMEM;
+
+	i2c_set_clientdata(client, sdata);
+
+	sdata->client = client;
+	mutex_init(&sdata->mutex);
+	init_completion(&sdata->cmd_done);
+
+	err = devm_regulator_bulk_get_const(dev,
+					    ARRAY_SIZE(stmfts_supplies),
+					    stmfts_supplies,
+					    &sdata->supplies);
+	if (err)
+		return err;
+
+	sdata->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(sdata->reset_gpio))
+		return dev_err_probe(dev, PTR_ERR(sdata->reset_gpio),
+				     "Failed to get GPIO 'reset'\n");
+
+	sdata->input = devm_input_allocate_device(dev);
+	if (!sdata->input)
+		return -ENOMEM;
+
+	sdata->input->name = STMFTS_DEV_NAME;
+	sdata->input->id.bustype = BUS_I2C;
+	sdata->input->open = stmfts_input_open;
+	sdata->input->close = stmfts_input_close;
+
+	input_set_capability(sdata->input, EV_ABS, ABS_MT_POSITION_X);
+	input_set_capability(sdata->input, EV_ABS, ABS_MT_POSITION_Y);
+	touchscreen_parse_properties(sdata->input, true, &sdata->prop);
+
+	input_set_abs_params(sdata->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
+	input_set_abs_params(sdata->input, ABS_MT_TOUCH_MINOR, 0, 255, 0, 0);
+	input_set_abs_params(sdata->input, ABS_MT_ORIENTATION, 0, 255, 0, 0);
+	input_set_abs_params(sdata->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
+	input_set_abs_params(sdata->input, ABS_DISTANCE, 0, 255, 0, 0);
+
+	sdata->use_key = device_property_read_bool(dev, "touch-key-connected");
+	if (sdata->use_key) {
+		input_set_capability(sdata->input, EV_KEY, KEY_MENU);
+		input_set_capability(sdata->input, EV_KEY, KEY_BACK);
+	}
+
+	err = input_mt_init_slots(sdata->input,
+				  STMFTS_MAX_FINGERS, INPUT_MT_DIRECT);
+	if (err)
+		return err;
+
+	input_set_drvdata(sdata->input, sdata);
+
+	/*
+	 * stmfts_power_on expects interrupt to be disabled, but
+	 * at this point the device is still off and I do not trust
+	 * the status of the irq line that can generate some spurious
+	 * interrupts. To be on the safe side it's better to not enable
+	 * the interrupts during their request.
+	 */
+	err = devm_request_threaded_irq(dev, client->irq,
+					NULL, stmfts_irq_handler,
+					IRQF_ONESHOT | IRQF_NO_AUTOEN,
+					"stmfts_irq", sdata);
+	if (err)
+		return err;
+
+	dev_dbg(dev, "initializing ST-Microelectronics FTS...\n");
+
+	err = stmfts_power_on(sdata);
+	if (err)
+		return err;
+
+	err = devm_add_action_or_reset(dev, stmfts_power_off, sdata);
+	if (err)
+		return err;
+
+	err = input_register_device(sdata->input);
+	if (err)
+		return err;
+
+	if (sdata->use_key) {
+		err = stmfts_enable_led(sdata);
+		if (err) {
+			/*
+			 * Even if the LEDs have failed to be initialized and
+			 * used in the driver, I can still use the device even
+			 * without LEDs. The ledvdd regulator pointer will be
+			 * used as a flag.
+			 */
+			dev_warn(dev, "unable to use touchkey leds\n");
+			sdata->ledvdd = NULL;
+		}
+	}
+
+	pm_runtime_enable(dev);
+	device_enable_async_suspend(dev);
+
+	return 0;
+}
+
+static void stmfts_remove(struct i2c_client *client)
+{
+	pm_runtime_disable(&client->dev);
+}
+
+static int stmfts_runtime_suspend(struct device *dev)
+{
+	struct stmfts_data *sdata = dev_get_drvdata(dev);
+	int ret;
+
+	ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN);
+	if (ret)
+		dev_warn(dev, "failed to suspend device: %d\n", ret);
+
+	return ret;
+}
+
+static int stmfts_runtime_resume(struct device *dev)
+{
+	struct stmfts_data *sdata = dev_get_drvdata(dev);
+	struct i2c_client *client = sdata->client;
+	int ret;
+
+	ret = i2c_smbus_write_byte(client, STMFTS_SLEEP_OUT);
+	if (ret)
+		dev_err(dev, "failed to resume device: %d\n", ret);
+
+	return ret;
+}
+
+static int stmfts_suspend(struct device *dev)
+{
+	struct stmfts_data *sdata = dev_get_drvdata(dev);
+
+	stmfts_power_off(sdata);
+
+	return 0;
+}
+
+static int stmfts_resume(struct device *dev)
+{
+	struct stmfts_data *sdata = dev_get_drvdata(dev);
+
+	return stmfts_power_on(sdata);
+}
+
+static const struct dev_pm_ops stmfts_pm_ops = {
+	SYSTEM_SLEEP_PM_OPS(stmfts_suspend, stmfts_resume)
+	RUNTIME_PM_OPS(stmfts_runtime_suspend, stmfts_runtime_resume, NULL)
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id stmfts_of_match[] = {
+	{ .compatible = "st,stmfts", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, stmfts_of_match);
+#endif
+
+static const struct i2c_device_id stmfts_id[] = {
+	{ .name = "stmfts" },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, stmfts_id);
+
+static struct i2c_driver stmfts_driver = {
+	.driver = {
+		.name = STMFTS_DEV_NAME,
+		.dev_groups = stmfts_sysfs_groups,
+		.of_match_table = of_match_ptr(stmfts_of_match),
+		.pm = pm_ptr(&stmfts_pm_ops),
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
+	},
+	.probe = stmfts_probe,
+	.remove = stmfts_remove,
+	.id_table = stmfts_id,
+};
+
+module_i2c_driver(stmfts_driver);
+
+MODULE_AUTHOR("Andi Shyti <andi.shyti@samsung.com>");
+MODULE_DESCRIPTION("STMicroelectronics FTS Touch Screen");
+MODULE_LICENSE("GPL");