Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 931 insertions, 0 deletions

diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
new file mode 100644
index 000000000..e447febd1
--- /dev/null
+++ b/drivers/hwmon/lm75.c
@@ -0,0 +1,931 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * lm75.c - Part of lm_sensors, Linux kernel modules for hardware
+ *	 monitoring
+ * Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl>
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
+#include <linux/of_device.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+#include <linux/util_macros.h>
+#include <linux/regulator/consumer.h>
+#include "lm75.h"
+
+/*
+ * This driver handles the LM75 and compatible digital temperature sensors.
+ */
+
+enum lm75_type {		/* keep sorted in alphabetical order */
+	adt75,
+	ds1775,
+	ds75,
+	ds7505,
+	g751,
+	lm75,
+	lm75a,
+	lm75b,
+	max6625,
+	max6626,
+	max31725,
+	mcp980x,
+	pct2075,
+	stds75,
+	stlm75,
+	tcn75,
+	tmp100,
+	tmp101,
+	tmp105,
+	tmp112,
+	tmp175,
+	tmp275,
+	tmp75,
+	tmp75b,
+	tmp75c,
+};
+
+/**
+ * struct lm75_params - lm75 configuration parameters.
+ * @set_mask:		Bits to set in configuration register when configuring
+ *			the chip.
+ * @clr_mask:		Bits to clear in configuration register when configuring
+ *			the chip.
+ * @default_resolution:	Default number of bits to represent the temperature
+ *			value.
+ * @resolution_limits:	Limit register resolution. Optional. Should be set if
+ *			the resolution of limit registers does not match the
+ *			resolution of the temperature register.
+ * @resolutions:	List of resolutions associated with sample times.
+ *			Optional. Should be set if num_sample_times is larger
+ *			than 1, and if the resolution changes with sample times.
+ *			If set, number of entries must match num_sample_times.
+ * @default_sample_time:Sample time to be set by default.
+ * @num_sample_times:	Number of possible sample times to be set. Optional.
+ *			Should be set if the number of sample times is larger
+ *			than one.
+ * @sample_times:	All the possible sample times to be set. Mandatory if
+ *			num_sample_times is larger than 1. If set, number of
+ *			entries must match num_sample_times.
+ */
+
+struct lm75_params {
+	u8			set_mask;
+	u8			clr_mask;
+	u8			default_resolution;
+	u8			resolution_limits;
+	const u8		*resolutions;
+	unsigned int		default_sample_time;
+	u8			num_sample_times;
+	const unsigned int	*sample_times;
+};
+
+/* Addresses scanned */
+static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
+					0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
+
+/* The LM75 registers */
+#define LM75_REG_TEMP		0x00
+#define LM75_REG_CONF		0x01
+#define LM75_REG_HYST		0x02
+#define LM75_REG_MAX		0x03
+#define PCT2075_REG_IDLE	0x04
+
+/* Each client has this additional data */
+struct lm75_data {
+	struct i2c_client		*client;
+	struct regmap			*regmap;
+	struct regulator		*vs;
+	u8				orig_conf;
+	u8				current_conf;
+	u8				resolution;	/* In bits, 9 to 16 */
+	unsigned int			sample_time;	/* In ms */
+	enum lm75_type			kind;
+	const struct lm75_params	*params;
+};
+
+/*-----------------------------------------------------------------------*/
+
+static const u8 lm75_sample_set_masks[] = { 0 << 5, 1 << 5, 2 << 5, 3 << 5 };
+
+#define LM75_SAMPLE_CLEAR_MASK	(3 << 5)
+
+/* The structure below stores the configuration values of the supported devices.
+ * In case of being supported multiple configurations, the default one must
+ * always be the first element of the array
+ */
+static const struct lm75_params device_params[] = {
+	[adt75] = {
+		.clr_mask = 1 << 5,	/* not one-shot mode */
+		.default_resolution = 12,
+		.default_sample_time = MSEC_PER_SEC / 10,
+	},
+	[ds1775] = {
+		.clr_mask = 3 << 5,
+		.set_mask = 2 << 5,	/* 11-bit mode */
+		.default_resolution = 11,
+		.default_sample_time = 500,
+		.num_sample_times = 4,
+		.sample_times = (unsigned int []){ 125, 250, 500, 1000 },
+		.resolutions = (u8 []) {9, 10, 11, 12 },
+	},
+	[ds75] = {
+		.clr_mask = 3 << 5,
+		.set_mask = 2 << 5,	/* 11-bit mode */
+		.default_resolution = 11,
+		.default_sample_time = 600,
+		.num_sample_times = 4,
+		.sample_times = (unsigned int []){ 150, 300, 600, 1200 },
+		.resolutions = (u8 []) {9, 10, 11, 12 },
+	},
+	[stds75] = {
+		.clr_mask = 3 << 5,
+		.set_mask = 2 << 5,	/* 11-bit mode */
+		.default_resolution = 11,
+		.default_sample_time = 600,
+		.num_sample_times = 4,
+		.sample_times = (unsigned int []){ 150, 300, 600, 1200 },
+		.resolutions = (u8 []) {9, 10, 11, 12 },
+	},
+	[stlm75] = {
+		.default_resolution = 9,
+		.default_sample_time = MSEC_PER_SEC / 6,
+	},
+	[ds7505] = {
+		.set_mask = 3 << 5,	/* 12-bit mode*/
+		.default_resolution = 12,
+		.default_sample_time = 200,
+		.num_sample_times = 4,
+		.sample_times = (unsigned int []){ 25, 50, 100, 200 },
+		.resolutions = (u8 []) {9, 10, 11, 12 },
+	},
+	[g751] = {
+		.default_resolution = 9,
+		.default_sample_time = MSEC_PER_SEC / 10,
+	},
+	[lm75] = {
+		.default_resolution = 9,
+		.default_sample_time = MSEC_PER_SEC / 10,
+	},
+	[lm75a] = {
+		.default_resolution = 9,
+		.default_sample_time = MSEC_PER_SEC / 10,
+	},
+	[lm75b] = {
+		.default_resolution = 11,
+		.default_sample_time = MSEC_PER_SEC / 10,
+	},
+	[max6625] = {
+		.default_resolution = 9,
+		.default_sample_time = MSEC_PER_SEC / 7,
+	},
+	[max6626] = {
+		.default_resolution = 12,
+		.default_sample_time = MSEC_PER_SEC / 7,
+		.resolution_limits = 9,
+	},
+	[max31725] = {
+		.default_resolution = 16,
+		.default_sample_time = MSEC_PER_SEC / 20,
+	},
+	[tcn75] = {
+		.default_resolution = 9,
+		.default_sample_time = MSEC_PER_SEC / 18,
+	},
+	[pct2075] = {
+		.default_resolution = 11,
+		.default_sample_time = MSEC_PER_SEC / 10,
+		.num_sample_times = 31,
+		.sample_times = (unsigned int []){ 100, 200, 300, 400, 500, 600,
+		700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700,
+		1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700,
+		2800, 2900, 3000, 3100 },
+	},
+	[mcp980x] = {
+		.set_mask = 3 << 5,	/* 12-bit mode */
+		.clr_mask = 1 << 7,	/* not one-shot mode */
+		.default_resolution = 12,
+		.resolution_limits = 9,
+		.default_sample_time = 240,
+		.num_sample_times = 4,
+		.sample_times = (unsigned int []){ 30, 60, 120, 240 },
+		.resolutions = (u8 []) {9, 10, 11, 12 },
+	},
+	[tmp100] = {
+		.set_mask = 3 << 5,	/* 12-bit mode */
+		.clr_mask = 1 << 7,	/* not one-shot mode */
+		.default_resolution = 12,
+		.default_sample_time = 320,
+		.num_sample_times = 4,
+		.sample_times = (unsigned int []){ 40, 80, 160, 320 },
+		.resolutions = (u8 []) {9, 10, 11, 12 },
+	},
+	[tmp101] = {
+		.set_mask = 3 << 5,	/* 12-bit mode */
+		.clr_mask = 1 << 7,	/* not one-shot mode */
+		.default_resolution = 12,
+		.default_sample_time = 320,
+		.num_sample_times = 4,
+		.sample_times = (unsigned int []){ 40, 80, 160, 320 },
+		.resolutions = (u8 []) {9, 10, 11, 12 },
+	},
+	[tmp105] = {
+		.set_mask = 3 << 5,	/* 12-bit mode */
+		.clr_mask = 1 << 7,	/* not one-shot mode*/
+		.default_resolution = 12,
+		.default_sample_time = 220,
+		.num_sample_times = 4,
+		.sample_times = (unsigned int []){ 28, 55, 110, 220 },
+		.resolutions = (u8 []) {9, 10, 11, 12 },
+	},
+	[tmp112] = {
+		.set_mask = 3 << 5,	/* 8 samples / second */
+		.clr_mask = 1 << 7,	/* no one-shot mode*/
+		.default_resolution = 12,
+		.default_sample_time = 125,
+		.num_sample_times = 4,
+		.sample_times = (unsigned int []){ 125, 250, 1000, 4000 },
+	},
+	[tmp175] = {
+		.set_mask = 3 << 5,	/* 12-bit mode */
+		.clr_mask = 1 << 7,	/* not one-shot mode*/
+		.default_resolution = 12,
+		.default_sample_time = 220,
+		.num_sample_times = 4,
+		.sample_times = (unsigned int []){ 28, 55, 110, 220 },
+		.resolutions = (u8 []) {9, 10, 11, 12 },
+	},
+	[tmp275] = {
+		.set_mask = 3 << 5,	/* 12-bit mode */
+		.clr_mask = 1 << 7,	/* not one-shot mode*/
+		.default_resolution = 12,
+		.default_sample_time = 220,
+		.num_sample_times = 4,
+		.sample_times = (unsigned int []){ 28, 55, 110, 220 },
+		.resolutions = (u8 []) {9, 10, 11, 12 },
+	},
+	[tmp75] = {
+		.set_mask = 3 << 5,	/* 12-bit mode */
+		.clr_mask = 1 << 7,	/* not one-shot mode*/
+		.default_resolution = 12,
+		.default_sample_time = 220,
+		.num_sample_times = 4,
+		.sample_times = (unsigned int []){ 28, 55, 110, 220 },
+		.resolutions = (u8 []) {9, 10, 11, 12 },
+	},
+	[tmp75b] = { /* not one-shot mode, Conversion rate 37Hz */
+		.clr_mask = 1 << 7 | 3 << 5,
+		.default_resolution = 12,
+		.default_sample_time = MSEC_PER_SEC / 37,
+		.sample_times = (unsigned int []){ MSEC_PER_SEC / 37,
+			MSEC_PER_SEC / 18,
+			MSEC_PER_SEC / 9, MSEC_PER_SEC / 4 },
+		.num_sample_times = 4,
+	},
+	[tmp75c] = {
+		.clr_mask = 1 << 5,	/*not one-shot mode*/
+		.default_resolution = 12,
+		.default_sample_time = MSEC_PER_SEC / 12,
+	}
+};
+
+static inline long lm75_reg_to_mc(s16 temp, u8 resolution)
+{
+	return ((temp >> (16 - resolution)) * 1000) >> (resolution - 8);
+}
+
+static int lm75_write_config(struct lm75_data *data, u8 set_mask,
+			     u8 clr_mask)
+{
+	u8 value;
+
+	clr_mask |= LM75_SHUTDOWN;
+	value = data->current_conf & ~clr_mask;
+	value |= set_mask;
+
+	if (data->current_conf != value) {
+		s32 err;
+
+		err = i2c_smbus_write_byte_data(data->client, LM75_REG_CONF,
+						value);
+		if (err)
+			return err;
+		data->current_conf = value;
+	}
+	return 0;
+}
+
+static int lm75_read(struct device *dev, enum hwmon_sensor_types type,
+		     u32 attr, int channel, long *val)
+{
+	struct lm75_data *data = dev_get_drvdata(dev);
+	unsigned int regval;
+	int err, reg;
+
+	switch (type) {
+	case hwmon_chip:
+		switch (attr) {
+		case hwmon_chip_update_interval:
+			*val = data->sample_time;
+			break;
+		default:
+			return -EINVAL;
+		}
+		break;
+	case hwmon_temp:
+		switch (attr) {
+		case hwmon_temp_input:
+			reg = LM75_REG_TEMP;
+			break;
+		case hwmon_temp_max:
+			reg = LM75_REG_MAX;
+			break;
+		case hwmon_temp_max_hyst:
+			reg = LM75_REG_HYST;
+			break;
+		default:
+			return -EINVAL;
+		}
+		err = regmap_read(data->regmap, reg, &regval);
+		if (err < 0)
+			return err;
+
+		*val = lm75_reg_to_mc(regval, data->resolution);
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int lm75_write_temp(struct device *dev, u32 attr, long temp)
+{
+	struct lm75_data *data = dev_get_drvdata(dev);
+	u8 resolution;
+	int reg;
+
+	switch (attr) {
+	case hwmon_temp_max:
+		reg = LM75_REG_MAX;
+		break;
+	case hwmon_temp_max_hyst:
+		reg = LM75_REG_HYST;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/*
+	 * Resolution of limit registers is assumed to be the same as the
+	 * temperature input register resolution unless given explicitly.
+	 */
+	if (data->params->resolution_limits)
+		resolution = data->params->resolution_limits;
+	else
+		resolution = data->resolution;
+
+	temp = clamp_val(temp, LM75_TEMP_MIN, LM75_TEMP_MAX);
+	temp = DIV_ROUND_CLOSEST(temp  << (resolution - 8),
+				 1000) << (16 - resolution);
+
+	return regmap_write(data->regmap, reg, (u16)temp);
+}
+
+static int lm75_update_interval(struct device *dev, long val)
+{
+	struct lm75_data *data = dev_get_drvdata(dev);
+	unsigned int reg;
+	u8 index;
+	s32 err;
+
+	index = find_closest(val, data->params->sample_times,
+			     (int)data->params->num_sample_times);
+
+	switch (data->kind) {
+	default:
+		err = lm75_write_config(data, lm75_sample_set_masks[index],
+					LM75_SAMPLE_CLEAR_MASK);
+		if (err)
+			return err;
+
+		data->sample_time = data->params->sample_times[index];
+		if (data->params->resolutions)
+			data->resolution = data->params->resolutions[index];
+		break;
+	case tmp112:
+		err = regmap_read(data->regmap, LM75_REG_CONF, &reg);
+		if (err < 0)
+			return err;
+		reg &= ~0x00c0;
+		reg |= (3 - index) << 6;
+		err = regmap_write(data->regmap, LM75_REG_CONF, reg);
+		if (err < 0)
+			return err;
+		data->sample_time = data->params->sample_times[index];
+		break;
+	case pct2075:
+		err = i2c_smbus_write_byte_data(data->client, PCT2075_REG_IDLE,
+						index + 1);
+		if (err)
+			return err;
+		data->sample_time = data->params->sample_times[index];
+		break;
+	}
+	return 0;
+}
+
+static int lm75_write_chip(struct device *dev, u32 attr, long val)
+{
+	switch (attr) {
+	case hwmon_chip_update_interval:
+		return lm75_update_interval(dev, val);
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int lm75_write(struct device *dev, enum hwmon_sensor_types type,
+		      u32 attr, int channel, long val)
+{
+	switch (type) {
+	case hwmon_chip:
+		return lm75_write_chip(dev, attr, val);
+	case hwmon_temp:
+		return lm75_write_temp(dev, attr, val);
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static umode_t lm75_is_visible(const void *data, enum hwmon_sensor_types type,
+			       u32 attr, int channel)
+{
+	const struct lm75_data *config_data = data;
+
+	switch (type) {
+	case hwmon_chip:
+		switch (attr) {
+		case hwmon_chip_update_interval:
+			if (config_data->params->num_sample_times > 1)
+				return 0644;
+			return 0444;
+		}
+		break;
+	case hwmon_temp:
+		switch (attr) {
+		case hwmon_temp_input:
+			return 0444;
+		case hwmon_temp_max:
+		case hwmon_temp_max_hyst:
+			return 0644;
+		}
+		break;
+	default:
+		break;
+	}
+	return 0;
+}
+
+static const struct hwmon_channel_info *lm75_info[] = {
+	HWMON_CHANNEL_INFO(chip,
+			   HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL),
+	HWMON_CHANNEL_INFO(temp,
+			   HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST),
+	NULL
+};
+
+static const struct hwmon_ops lm75_hwmon_ops = {
+	.is_visible = lm75_is_visible,
+	.read = lm75_read,
+	.write = lm75_write,
+};
+
+static const struct hwmon_chip_info lm75_chip_info = {
+	.ops = &lm75_hwmon_ops,
+	.info = lm75_info,
+};
+
+static bool lm75_is_writeable_reg(struct device *dev, unsigned int reg)
+{
+	return reg != LM75_REG_TEMP;
+}
+
+static bool lm75_is_volatile_reg(struct device *dev, unsigned int reg)
+{
+	return reg == LM75_REG_TEMP || reg == LM75_REG_CONF;
+}
+
+static const struct regmap_config lm75_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 16,
+	.max_register = PCT2075_REG_IDLE,
+	.writeable_reg = lm75_is_writeable_reg,
+	.volatile_reg = lm75_is_volatile_reg,
+	.val_format_endian = REGMAP_ENDIAN_BIG,
+	.cache_type = REGCACHE_RBTREE,
+	.use_single_read = true,
+	.use_single_write = true,
+};
+
+static void lm75_disable_regulator(void *data)
+{
+	struct lm75_data *lm75 = data;
+
+	regulator_disable(lm75->vs);
+}
+
+static void lm75_remove(void *data)
+{
+	struct lm75_data *lm75 = data;
+	struct i2c_client *client = lm75->client;
+
+	i2c_smbus_write_byte_data(client, LM75_REG_CONF, lm75->orig_conf);
+}
+
+static const struct i2c_device_id lm75_ids[];
+
+static int lm75_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct device *hwmon_dev;
+	struct lm75_data *data;
+	int status, err;
+	enum lm75_type kind;
+
+	if (client->dev.of_node)
+		kind = (enum lm75_type)of_device_get_match_data(&client->dev);
+	else
+		kind = i2c_match_id(lm75_ids, client)->driver_data;
+
+	if (!i2c_check_functionality(client->adapter,
+			I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
+		return -EIO;
+
+	data = devm_kzalloc(dev, sizeof(struct lm75_data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->client = client;
+	data->kind = kind;
+
+	data->vs = devm_regulator_get(dev, "vs");
+	if (IS_ERR(data->vs))
+		return PTR_ERR(data->vs);
+
+	data->regmap = devm_regmap_init_i2c(client, &lm75_regmap_config);
+	if (IS_ERR(data->regmap))
+		return PTR_ERR(data->regmap);
+
+	/* Set to LM75 resolution (9 bits, 1/2 degree C) and range.
+	 * Then tweak to be more precise when appropriate.
+	 */
+
+	data->params = &device_params[data->kind];
+
+	/* Save default sample time and resolution*/
+	data->sample_time = data->params->default_sample_time;
+	data->resolution = data->params->default_resolution;
+
+	/* Enable the power */
+	err = regulator_enable(data->vs);
+	if (err) {
+		dev_err(dev, "failed to enable regulator: %d\n", err);
+		return err;
+	}
+
+	err = devm_add_action_or_reset(dev, lm75_disable_regulator, data);
+	if (err)
+		return err;
+
+	/* Cache original configuration */
+	status = i2c_smbus_read_byte_data(client, LM75_REG_CONF);
+	if (status < 0) {
+		dev_dbg(dev, "Can't read config? %d\n", status);
+		return status;
+	}
+	data->orig_conf = status;
+	data->current_conf = status;
+
+	err = lm75_write_config(data, data->params->set_mask,
+				data->params->clr_mask);
+	if (err)
+		return err;
+
+	err = devm_add_action_or_reset(dev, lm75_remove, data);
+	if (err)
+		return err;
+
+	hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
+							 data, &lm75_chip_info,
+							 NULL);
+	if (IS_ERR(hwmon_dev))
+		return PTR_ERR(hwmon_dev);
+
+	dev_info(dev, "%s: sensor '%s'\n", dev_name(hwmon_dev), client->name);
+
+	return 0;
+}
+
+static const struct i2c_device_id lm75_ids[] = {
+	{ "adt75", adt75, },
+	{ "ds1775", ds1775, },
+	{ "ds75", ds75, },
+	{ "ds7505", ds7505, },
+	{ "g751", g751, },
+	{ "lm75", lm75, },
+	{ "lm75a", lm75a, },
+	{ "lm75b", lm75b, },
+	{ "max6625", max6625, },
+	{ "max6626", max6626, },
+	{ "max31725", max31725, },
+	{ "max31726", max31725, },
+	{ "mcp980x", mcp980x, },
+	{ "pct2075", pct2075, },
+	{ "stds75", stds75, },
+	{ "stlm75", stlm75, },
+	{ "tcn75", tcn75, },
+	{ "tmp100", tmp100, },
+	{ "tmp101", tmp101, },
+	{ "tmp105", tmp105, },
+	{ "tmp112", tmp112, },
+	{ "tmp175", tmp175, },
+	{ "tmp275", tmp275, },
+	{ "tmp75", tmp75, },
+	{ "tmp75b", tmp75b, },
+	{ "tmp75c", tmp75c, },
+	{ /* LIST END */ }
+};
+MODULE_DEVICE_TABLE(i2c, lm75_ids);
+
+static const struct of_device_id __maybe_unused lm75_of_match[] = {
+	{
+		.compatible = "adi,adt75",
+		.data = (void *)adt75
+	},
+	{
+		.compatible = "dallas,ds1775",
+		.data = (void *)ds1775
+	},
+	{
+		.compatible = "dallas,ds75",
+		.data = (void *)ds75
+	},
+	{
+		.compatible = "dallas,ds7505",
+		.data = (void *)ds7505
+	},
+	{
+		.compatible = "gmt,g751",
+		.data = (void *)g751
+	},
+	{
+		.compatible = "national,lm75",
+		.data = (void *)lm75
+	},
+	{
+		.compatible = "national,lm75a",
+		.data = (void *)lm75a
+	},
+	{
+		.compatible = "national,lm75b",
+		.data = (void *)lm75b
+	},
+	{
+		.compatible = "maxim,max6625",
+		.data = (void *)max6625
+	},
+	{
+		.compatible = "maxim,max6626",
+		.data = (void *)max6626
+	},
+	{
+		.compatible = "maxim,max31725",
+		.data = (void *)max31725
+	},
+	{
+		.compatible = "maxim,max31726",
+		.data = (void *)max31725
+	},
+	{
+		.compatible = "maxim,mcp980x",
+		.data = (void *)mcp980x
+	},
+	{
+		.compatible = "nxp,pct2075",
+		.data = (void *)pct2075
+	},
+	{
+		.compatible = "st,stds75",
+		.data = (void *)stds75
+	},
+	{
+		.compatible = "st,stlm75",
+		.data = (void *)stlm75
+	},
+	{
+		.compatible = "microchip,tcn75",
+		.data = (void *)tcn75
+	},
+	{
+		.compatible = "ti,tmp100",
+		.data = (void *)tmp100
+	},
+	{
+		.compatible = "ti,tmp101",
+		.data = (void *)tmp101
+	},
+	{
+		.compatible = "ti,tmp105",
+		.data = (void *)tmp105
+	},
+	{
+		.compatible = "ti,tmp112",
+		.data = (void *)tmp112
+	},
+	{
+		.compatible = "ti,tmp175",
+		.data = (void *)tmp175
+	},
+	{
+		.compatible = "ti,tmp275",
+		.data = (void *)tmp275
+	},
+	{
+		.compatible = "ti,tmp75",
+		.data = (void *)tmp75
+	},
+	{
+		.compatible = "ti,tmp75b",
+		.data = (void *)tmp75b
+	},
+	{
+		.compatible = "ti,tmp75c",
+		.data = (void *)tmp75c
+	},
+	{ },
+};
+MODULE_DEVICE_TABLE(of, lm75_of_match);
+
+#define LM75A_ID 0xA1
+
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int lm75_detect(struct i2c_client *new_client,
+		       struct i2c_board_info *info)
+{
+	struct i2c_adapter *adapter = new_client->adapter;
+	int i;
+	int conf, hyst, os;
+	bool is_lm75a = 0;
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
+				     I2C_FUNC_SMBUS_WORD_DATA))
+		return -ENODEV;
+
+	/*
+	 * Now, we do the remaining detection. There is no identification-
+	 * dedicated register so we have to rely on several tricks:
+	 * unused bits, registers cycling over 8-address boundaries,
+	 * addresses 0x04-0x07 returning the last read value.
+	 * The cycling+unused addresses combination is not tested,
+	 * since it would significantly slow the detection down and would
+	 * hardly add any value.
+	 *
+	 * The National Semiconductor LM75A is different than earlier
+	 * LM75s.  It has an ID byte of 0xaX (where X is the chip
+	 * revision, with 1 being the only revision in existence) in
+	 * register 7, and unused registers return 0xff rather than the
+	 * last read value.
+	 *
+	 * Note that this function only detects the original National
+	 * Semiconductor LM75 and the LM75A. Clones from other vendors
+	 * aren't detected, on purpose, because they are typically never
+	 * found on PC hardware. They are found on embedded designs where
+	 * they can be instantiated explicitly so detection is not needed.
+	 * The absence of identification registers on all these clones
+	 * would make their exhaustive detection very difficult and weak,
+	 * and odds are that the driver would bind to unsupported devices.
+	 */
+
+	/* Unused bits */
+	conf = i2c_smbus_read_byte_data(new_client, 1);
+	if (conf & 0xe0)
+		return -ENODEV;
+
+	/* First check for LM75A */
+	if (i2c_smbus_read_byte_data(new_client, 7) == LM75A_ID) {
+		/*
+		 * LM75A returns 0xff on unused registers so
+		 * just to be sure we check for that too.
+		 */
+		if (i2c_smbus_read_byte_data(new_client, 4) != 0xff
+		 || i2c_smbus_read_byte_data(new_client, 5) != 0xff
+		 || i2c_smbus_read_byte_data(new_client, 6) != 0xff)
+			return -ENODEV;
+		is_lm75a = 1;
+		hyst = i2c_smbus_read_byte_data(new_client, 2);
+		os = i2c_smbus_read_byte_data(new_client, 3);
+	} else { /* Traditional style LM75 detection */
+		/* Unused addresses */
+		hyst = i2c_smbus_read_byte_data(new_client, 2);
+		if (i2c_smbus_read_byte_data(new_client, 4) != hyst
+		 || i2c_smbus_read_byte_data(new_client, 5) != hyst
+		 || i2c_smbus_read_byte_data(new_client, 6) != hyst
+		 || i2c_smbus_read_byte_data(new_client, 7) != hyst)
+			return -ENODEV;
+		os = i2c_smbus_read_byte_data(new_client, 3);
+		if (i2c_smbus_read_byte_data(new_client, 4) != os
+		 || i2c_smbus_read_byte_data(new_client, 5) != os
+		 || i2c_smbus_read_byte_data(new_client, 6) != os
+		 || i2c_smbus_read_byte_data(new_client, 7) != os)
+			return -ENODEV;
+	}
+	/*
+	 * It is very unlikely that this is a LM75 if both
+	 * hysteresis and temperature limit registers are 0.
+	 */
+	if (hyst == 0 && os == 0)
+		return -ENODEV;
+
+	/* Addresses cycling */
+	for (i = 8; i <= 248; i += 40) {
+		if (i2c_smbus_read_byte_data(new_client, i + 1) != conf
+		 || i2c_smbus_read_byte_data(new_client, i + 2) != hyst
+		 || i2c_smbus_read_byte_data(new_client, i + 3) != os)
+			return -ENODEV;
+		if (is_lm75a && i2c_smbus_read_byte_data(new_client, i + 7)
+				!= LM75A_ID)
+			return -ENODEV;
+	}
+
+	strlcpy(info->type, is_lm75a ? "lm75a" : "lm75", I2C_NAME_SIZE);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int lm75_suspend(struct device *dev)
+{
+	int status;
+	struct i2c_client *client = to_i2c_client(dev);
+
+	status = i2c_smbus_read_byte_data(client, LM75_REG_CONF);
+	if (status < 0) {
+		dev_dbg(&client->dev, "Can't read config? %d\n", status);
+		return status;
+	}
+	status = status | LM75_SHUTDOWN;
+	i2c_smbus_write_byte_data(client, LM75_REG_CONF, status);
+	return 0;
+}
+
+static int lm75_resume(struct device *dev)
+{
+	int status;
+	struct i2c_client *client = to_i2c_client(dev);
+
+	status = i2c_smbus_read_byte_data(client, LM75_REG_CONF);
+	if (status < 0) {
+		dev_dbg(&client->dev, "Can't read config? %d\n", status);
+		return status;
+	}
+	status = status & ~LM75_SHUTDOWN;
+	i2c_smbus_write_byte_data(client, LM75_REG_CONF, status);
+	return 0;
+}
+
+static const struct dev_pm_ops lm75_dev_pm_ops = {
+	.suspend	= lm75_suspend,
+	.resume		= lm75_resume,
+};
+#define LM75_DEV_PM_OPS (&lm75_dev_pm_ops)
+#else
+#define LM75_DEV_PM_OPS NULL
+#endif /* CONFIG_PM */
+
+static struct i2c_driver lm75_driver = {
+	.class		= I2C_CLASS_HWMON,
+	.driver = {
+		.name	= "lm75",
+		.of_match_table = of_match_ptr(lm75_of_match),
+		.pm	= LM75_DEV_PM_OPS,
+	},
+	.probe_new	= lm75_probe,
+	.id_table	= lm75_ids,
+	.detect		= lm75_detect,
+	.address_list	= normal_i2c,
+};
+
+module_i2c_driver(lm75_driver);
+
+MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
+MODULE_DESCRIPTION("LM75 driver");
+MODULE_LICENSE("GPL");