treewide: refresh kmalloc_obj() conversionsgrafted

This is another run of the Coccinelle script for converting kmalloc()
family of allocations to kmalloc_obj() via the existing rules in
scripts/coccinelle/api/kmalloc_objs.cocci

This catches both the set of kmalloc() uses added since the first
kmalloc_obj() conversions in v7.0 and adds a large group missed in the
first pass due to Coccinelle not interacting well with the cleanup.h
scoped_...() family of macros[1]. I worked around this with spatch's
"--macro-file" argument to a file with all the scoped_...() macros mapped
to Coccinelle's YACFE_ITERATOR[2] as that was the closest viable control
flow indicator I could find.

Build tested allmodconfig on x86, arm64, arm, loongarch, mips, powerpc,
riscv, and s390 with no new warnings.

Link: https://lore.kernel.org/lkml/202609021314.8A9C0B8@keescook/ [1]
Link: https://github.com/coccinelle/coccinelle/blob/master/standard.h [2]
Signed-off-by: Kees Cook <kees+treewide@kernel.org>

1 files changed, 158 insertions, 0 deletions

diff --git a/drivers/hwmon/pmbus/max20830.c b/drivers/hwmon/pmbus/max20830.c
new file mode 100644
index 000000000..4d25a084a
--- /dev/null
+++ b/drivers/hwmon/pmbus/max20830.c
@@ -0,0 +1,158 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Hardware monitoring driver for Analog Devices MAX20830
+ *
+ * Copyright (C) 2026 Analog Devices, Inc.
+ */
+
+#include <linux/errno.h>
+#include <linux/i2c.h>
+#include <linux/math64.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include "pmbus.h"
+
+#define MAX20830_IC_DEVICE_ID_LENGTH	9
+
+struct max20830_data {
+	struct pmbus_driver_info info;
+	u32 vout_rfb1;
+	u32 vout_rfb2;
+};
+
+static const char * const supported_chip_ids[] = {
+	"MAX20830",
+	"MAX20830C",
+	"MAX20840C",
+};
+
+/*
+ * MAX20830 only supports READ_VOUT for VOUT monitoring.
+ *
+ * Limit registers (VOUT_OV_WARN_LIMIT, VOUT_OV_FAULT_LIMIT, etc.) are not
+ * supported by this driver and return -ENODATA. This means sysfs attributes
+ * like in1_max, in1_crit, etc. will not be available. Only in1_input (the
+ * scaled output voltage) is supported.
+ *
+ * MAX20830 uses an external resistor divider for voltage sensing:
+ * - VOUT_COMMAND and VOUT_MAX set the reference voltage at the feedback pin
+ * - READ_VOUT reports the feedback voltage, which needs to be scaled for actual
+ *   output voltage
+ *
+ * Scaling formula: vout_actual = vout_fb × (1 + RFB1 / RFB2)
+ *
+ * If regulator support is added in the future, some adjustments are needed to
+ * ensure correct feedback voltages are set.
+ */
+static int max20830_read_word_data(struct i2c_client *client, int page,
+				   int phase, int reg)
+{
+	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+	const struct max20830_data *data = container_of(info, struct max20830_data, info);
+	int ret;
+	u64 temp;
+
+	switch (reg) {
+	case PMBUS_READ_VOUT:
+		ret = pmbus_read_word_data(client, page, phase, reg);
+		if (ret < 0)
+			return ret;
+
+		/* Apply voltage divider scaling if resistors are non-zero */
+		if (data->vout_rfb1 && data->vout_rfb2) {
+			temp = (u64)data->vout_rfb1 + (u64)data->vout_rfb2;
+			temp = DIV_ROUND_CLOSEST_ULL((u64)ret * temp, data->vout_rfb2);
+			ret = clamp_val(temp, 0, 0xFFFF);
+		}
+		return ret;
+	default:
+		return -ENODATA;
+	}
+}
+
+static struct pmbus_driver_info max20830_info = {
+	.pages = 1,
+	.format[PSC_VOLTAGE_IN] = linear,
+	.format[PSC_VOLTAGE_OUT] = linear,
+	.format[PSC_CURRENT_OUT] = linear,
+	.format[PSC_TEMPERATURE] = linear,
+	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
+		PMBUS_HAVE_TEMP |
+		PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
+		PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
+	.read_word_data = max20830_read_word_data,
+	.have_pmbus_revision = true,
+	.pmbus_revision = PMBUS_REV_13,
+};
+
+static int max20830_probe(struct i2c_client *client)
+{
+	u8 buf[I2C_SMBUS_BLOCK_MAX + 1] = {};
+	struct max20830_data *data;
+	int i, ret;
+
+	data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->info = max20830_info;
+
+	/* Read optional voltage divider resistor values */
+	device_property_read_u32(&client->dev, "adi,vout-rfb1-ohms", &data->vout_rfb1);
+	device_property_read_u32(&client->dev, "adi,vout-rfb2-ohms", &data->vout_rfb2);
+
+	ret = pmbus_read_smbus_i2c_block_data(client, PMBUS_IC_DEVICE_ID, buf);
+	if (ret < 0)
+		return dev_err_probe(&client->dev, ret,
+				     "Failed to read IC_DEVICE_ID\n");
+
+	/* Verify we read the expected number of bytes */
+	if (ret < MAX20830_IC_DEVICE_ID_LENGTH)
+		return dev_err_probe(&client->dev, -ENODEV,
+				     "IC_DEVICE_ID too short: expected %d bytes, got %d\n",
+				     MAX20830_IC_DEVICE_ID_LENGTH, ret);
+
+	/* Null-terminate the string */
+	buf[ret] = '\0';
+
+	/* Verify the device ID matches what we expect */
+	for (i = 0; i < ARRAY_SIZE(supported_chip_ids); i++) {
+		if (!strcmp(buf, supported_chip_ids[i]))
+			break;
+	}
+
+	/* No match found - unsupported device */
+	if (i == ARRAY_SIZE(supported_chip_ids))
+		return dev_err_probe(&client->dev, -ENODEV,
+				     "Unsupported device: '%*pE'\n", ret, buf);
+
+	return pmbus_do_probe(client, &data->info);
+}
+
+static const struct i2c_device_id max20830_id[] = {
+	{"max20830"},
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, max20830_id);
+
+static const struct of_device_id max20830_of_match[] = {
+	{ .compatible = "adi,max20830" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, max20830_of_match);
+
+static struct i2c_driver max20830_driver = {
+	.driver = {
+		.name = "max20830",
+		.of_match_table = max20830_of_match,
+	},
+	.probe = max20830_probe,
+	.id_table = max20830_id,
+};
+
+module_i2c_driver(max20830_driver);
+
+MODULE_AUTHOR("Alexis Czezar Torreno <alexisczezar.torreno@analog.com>");
+MODULE_DESCRIPTION("PMBus driver for Analog Devices MAX20830");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("PMBUS");