drivers/hwmon/lm75.c

// 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/interrupt.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/i3c/device.h>
#include <linux/hwmon.h>
#include <linux/err.h>
#include <linux/property.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,
	as6200,
	at30ts74,
	ds1775,
	ds75,
	ds7505,
	g751,
	lm75,
	lm75a,
	lm75b,
	max6625,
	max6626,
	max31725,
	mcp980x,
	p3t1750,
	p3t1755,
	pct2075,
	stds75,
	stlm75,
	tcn75,
	tmp100,
	tmp101,
	tmp105,
	tmp112,
	tmp175,
	tmp275,
	tmp75,
	tmp75b,
	tmp75c,
	tmp1075,
};

/**
 * struct lm75_params - lm75 configuration parameters.
 * @config_reg_16bits:	Configure register size is 2 bytes.
 * @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.
 * @alarm:		Alarm bit is supported.
 */

struct lm75_params {
	bool			config_reg_16bits;
	u16			set_mask;
	u16			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;
	bool			alarm;
};

/* 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

struct lm75_data {
	const char *label;
	struct regmap			*regmap;
	u16				orig_conf;
	u8				resolution;	/* In bits, 9 to 16 */
	unsigned int			sample_time;	/* In ms */
	enum lm75_type			kind;
	const struct lm75_params	*params;
	u8				reg_buf[1];
	u8				val_buf[3];
};

/*-----------------------------------------------------------------------*/

static const u8 lm75_sample_set_masks[] = { 0 << 5, 1 << 5, 2 << 5, 3 << 5 };

#define LM75_ALERT_POLARITY_HIGH_8_BIT	(BIT(2))
#define LM75_ALERT_POLARITY_HIGH_16_BIT	(BIT(2) << 8)
#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,
	},
	[as6200] = {
		.config_reg_16bits = true,
		.set_mask = 0xC010,	/* 8 sample/s, 4 CF */
		.default_resolution = 12,
		.default_sample_time = 125,
		.num_sample_times = 4,
		.sample_times = (unsigned int []){ 125, 250, 1000, 4000 },
		.alarm = true,
	},
	[at30ts74] = {
		.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 },
	},
	[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,
	},
	[p3t1750] = {
		.clr_mask = 1 << 1 | 1 << 7,	/* disable SMBAlert and one-shot */
		.default_resolution = 12,
		.default_sample_time = 55,
		.num_sample_times = 4,
		.sample_times = (unsigned int []){ 28, 55, 110, 220 },
	},
	[p3t1755] = {
		.clr_mask = 1 << 1 | 1 << 7,	/* disable SMBAlert and one-shot */
		.default_resolution = 12,
		.default_sample_time = 55,
		.num_sample_times = 4,
		.sample_times = (unsigned int []){ 28, 55, 110, 220 },
	},
	[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] = {
		.config_reg_16bits = true,
		.set_mask = 0xC060,	/* 12-bit mode, 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 },
		.alarm = true,
	},
	[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,
	},
	[tmp1075] = { /* not one-shot mode, 27.5 ms sample rate */
		.clr_mask = 1 << 5 | 1 << 6 | 1 << 7,
		.default_resolution = 12,
		.default_sample_time = 28,
		.num_sample_times = 4,
		.sample_times = (unsigned int []){ 28, 55, 110, 220 },
	}
};

static inline long lm75_reg_to_mc(s16 temp, u8 resolution)
{
	return ((temp >> (16 - resolution)) * 1000) >> (resolution - 8);
}

static inline int lm75_write_config(struct lm75_data *data, u16 set_mask,
				    u16 clr_mask)
{
	return regmap_update_bits(data->regmap, LM75_REG_CONF,
				  clr_mask | set_mask | LM75_SHUTDOWN, set_mask);
}

static irqreturn_t lm75_alarm_handler(int irq, void *private)
{
	struct device *hwmon_dev = private;

	hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_alarm, 0);
	return IRQ_HANDLED;
}

static int lm75_read_string(struct device *dev, enum hwmon_sensor_types type,
			    u32 attr, int channel, const char **str)
{
	struct lm75_data *data = dev_get_drvdata(dev);

	*str = data->label;

	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;
		case hwmon_temp_alarm:
			reg = LM75_REG_CONF;
			break;
		default:
			return -EINVAL;
		}
		err = regmap_read(data->regmap, reg, &regval);
		if (err < 0)
			return err;

		if (attr == hwmon_temp_alarm) {
			switch (data->kind) {
			case as6200:
			case tmp112:
				*val = !!(regval & BIT(13)) == !!(regval & BIT(2));
				break;
			default:
				return -EINVAL;
			}
		} else {
			*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);
	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:
	case as6200:
		err = regmap_update_bits(data->regmap, LM75_REG_CONF,
					 0xc000, (3 - index) << 14);
		if (err < 0)
			return err;
		data->sample_time = data->params->sample_times[index];
		break;
	case pct2075:
		err = regmap_write(data->regmap, 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;
		default:
			break;
		}
		break;
	case hwmon_temp:
		switch (attr) {
		case hwmon_temp_input:
			return 0444;
		case hwmon_temp_label:
		/* Hide label node if label is not provided */
			return config_data->label ? 0444 : 0;
		case hwmon_temp_max:
		case hwmon_temp_max_hyst:
			return 0644;
		case hwmon_temp_alarm:
			if (config_data->params->alarm)
				return 0444;
			break;
		default:
			break;
		}
		break;
	default:
		break;
	}
	return 0;
}

static const struct hwmon_channel_info * const lm75_info[] = {
	HWMON_CHANNEL_INFO(chip,
			   HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL),
	HWMON_CHANNEL_INFO(temp,
			   HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_MAX | HWMON_T_MAX_HYST |
			   HWMON_T_ALARM),
	NULL
};

static const struct hwmon_ops lm75_hwmon_ops = {
	.is_visible = lm75_is_visible,
	.read_string = lm75_read_string,
	.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 int lm75_i2c_reg_read(void *context, unsigned int reg, unsigned int *val)
{
	struct i2c_client *client = context;
	struct lm75_data *data = i2c_get_clientdata(client);
	int ret;

	if (reg == LM75_REG_CONF) {
		if (!data->params->config_reg_16bits)
			ret = i2c_smbus_read_byte_data(client, LM75_REG_CONF);
		else
			ret = i2c_smbus_read_word_data(client, LM75_REG_CONF);
	} else {
		ret = i2c_smbus_read_word_swapped(client, reg);
	}
	if (ret < 0)
		return ret;
	*val = ret;
	return 0;
}

static int lm75_i2c_reg_write(void *context, unsigned int reg, unsigned int val)
{
	struct i2c_client *client = context;
	struct lm75_data *data = i2c_get_clientdata(client);

	if (reg == PCT2075_REG_IDLE ||
	    (reg == LM75_REG_CONF && !data->params->config_reg_16bits))
		return i2c_smbus_write_byte_data(client, reg, val);
	else if (reg == LM75_REG_CONF)
		return i2c_smbus_write_word_data(client, reg, val);
	return i2c_smbus_write_word_swapped(client, reg, val);
}

static const struct regmap_bus lm75_i2c_regmap_bus = {
	.reg_read = lm75_i2c_reg_read,
	.reg_write = lm75_i2c_reg_write,
};

static int lm75_i3c_reg_read(void *context, unsigned int reg, unsigned int *val)
{
	struct i3c_device *i3cdev = context;
	struct lm75_data *data = i3cdev_get_drvdata(i3cdev);
	struct i3c_xfer xfers[] = {
		{
			.rnw = false,
			.len = 1,
			.data.out = data->reg_buf,
		},
		{
			.rnw = true,
			.len = 2,
			.data.in = data->val_buf,
		},
	};
	int ret;

	data->reg_buf[0] = reg;

	if (reg == LM75_REG_CONF && !data->params->config_reg_16bits)
		xfers[1].len--;

	ret = i3c_device_do_xfers(i3cdev, xfers, 2, I3C_SDR);
	if (ret < 0)
		return ret;

	if (reg == LM75_REG_CONF && !data->params->config_reg_16bits)
		*val = data->val_buf[0];
	else if (reg == LM75_REG_CONF)
		*val = data->val_buf[0] | (data->val_buf[1] << 8);
	else
		*val = data->val_buf[1] | (data->val_buf[0] << 8);

	return 0;
}

static int lm75_i3c_reg_write(void *context, unsigned int reg, unsigned int val)
{
	struct i3c_device *i3cdev = context;
	struct lm75_data *data = i3cdev_get_drvdata(i3cdev);
	struct i3c_xfer xfers[] = {
		{
			.rnw = false,
			.len = 3,
			.data.out = data->val_buf,
		},
	};

	data->val_buf[0] = reg;

	if (reg == PCT2075_REG_IDLE ||
	    (reg == LM75_REG_CONF && !data->params->config_reg_16bits)) {
		xfers[0].len--;
		data->val_buf[1] = val & 0xff;
	} else if (reg == LM75_REG_CONF) {
		data->val_buf[1] = val & 0xff;
		data->val_buf[2] = (val >> 8) & 0xff;
	} else {
		data->val_buf[1] = (val >> 8) & 0xff;
		data->val_buf[2] = val & 0xff;
	}

	return i3c_device_do_xfers(i3cdev, xfers, 1, I3C_SDR);
}

static const struct regmap_bus lm75_i3c_regmap_bus = {
	.reg_read = lm75_i3c_reg_read,
	.reg_write = lm75_i3c_reg_write,
};

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_MAPLE,
	.use_single_read = true,
	.use_single_write = true,
};

static void lm75_remove(void *data)
{
	struct lm75_data *lm75 = data;

	regmap_write(lm75->regmap, LM75_REG_CONF, lm75->orig_conf);
}

static int lm75_generic_probe(struct device *dev, const char *name,
			      enum lm75_type kind, int irq, struct regmap *regmap)
{
	u16 clr_mask, pol_mask, set_mask;
	struct device *hwmon_dev;
	struct lm75_data *data;
	int status, err;

	data = devm_kzalloc(dev, sizeof(struct lm75_data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	/* needed by custom regmap callbacks */
	dev_set_drvdata(dev, data);

	/* Save the connected input label if available */
	device_property_read_string(dev, "label", &data->label);

	data->kind = kind;
	data->regmap = regmap;

	err = devm_regulator_get_enable(dev, "vs");
	if (err)
		return err;

	/* 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;

	/* Cache original configuration */
	err = regmap_read(data->regmap, LM75_REG_CONF, &status);
	if (err)
		return err;
	data->orig_conf = status;

	/* Enforce polarity active-low (default) or active-high (devicetree) */
	if (!data->params->config_reg_16bits)
		pol_mask = LM75_ALERT_POLARITY_HIGH_8_BIT;
	else
		pol_mask = LM75_ALERT_POLARITY_HIGH_16_BIT;

	clr_mask = data->params->clr_mask | pol_mask;
	set_mask = data->params->set_mask & ~pol_mask;
	if (device_property_read_bool(dev, "ti,alert-polarity-active-high"))
		set_mask |= pol_mask;

	err = lm75_write_config(data, set_mask, 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, name, data,
							 &lm75_chip_info, NULL);
	if (IS_ERR(hwmon_dev))
		return PTR_ERR(hwmon_dev);

	if (irq) {
		if (data->params->alarm) {
			err = devm_request_threaded_irq(dev,
							irq,
							NULL,
							&lm75_alarm_handler,
							IRQF_ONESHOT,
							name,
							hwmon_dev);
			if (err)
				return err;
		} else {
			 /* alarm is only supported for chips with alarm bit */
			dev_err(dev, "alarm interrupt is not supported\n");
		}
	}

	dev_info(dev, "%s: sensor '%s'\n", dev_name(hwmon_dev), name);

	return 0;
}

static int lm75_i2c_probe(struct i2c_client *client)
{
	struct device *dev = &client->dev;
	struct regmap *regmap;

	if (!i2c_check_functionality(client->adapter,
			I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
		return -EOPNOTSUPP;

	regmap = devm_regmap_init(dev, &lm75_i2c_regmap_bus, client, &lm75_regmap_config);
	if (IS_ERR(regmap))
		return PTR_ERR(regmap);

	return lm75_generic_probe(dev, client->name, (uintptr_t)i2c_get_match_data(client),
				  client->irq, regmap);
}

static const struct i2c_device_id lm75_i2c_ids[] = {
	{ .name = "adt75", .driver_data = adt75 },
	{ .name = "as6200", .driver_data = as6200 },
	{ .name = "at30ts74", .driver_data = at30ts74 },
	{ .name = "ds1775", .driver_data = ds1775 },
	{ .name = "ds75", .driver_data = ds75 },
	{ .name = "ds7505", .driver_data = ds7505 },
	{ .name = "g751", .driver_data = g751 },
	{ .name = "lm75", .driver_data = lm75 },
	{ .name = "lm75a", .driver_data = lm75a },
	{ .name = "lm75b", .driver_data = lm75b },
	{ .name = "max6625", .driver_data = max6625 },
	{ .name = "max6626", .driver_data = max6626 },
	{ .name = "max31725", .driver_data = max31725 },
	{ .name = "max31726", .driver_data = max31725 },
	{ .name = "mcp980x", .driver_data = mcp980x },
	{ .name = "p3t1750", .driver_data = p3t1750 },
	{ .name = "p3t1755", .driver_data = p3t1755 },
	{ .name = "pct2075", .driver_data = pct2075 },
	{ .name = "stds75", .driver_data = stds75 },
	{ .name = "stlm75", .driver_data = stlm75 },
	{ .name = "tcn75", .driver_data = tcn75 },
	{ .name = "tmp100", .driver_data = tmp100 },
	{ .name = "tmp101", .driver_data = tmp101 },
	{ .name = "tmp105", .driver_data = tmp105 },
	{ .name = "tmp112", .driver_data = tmp112 },
	{ .name = "tmp175", .driver_data = tmp175 },
	{ .name = "tmp275", .driver_data = tmp275 },
	{ .name = "tmp75", .driver_data = tmp75 },
	{ .name = "tmp75b", .driver_data = tmp75b },
	{ .name = "tmp75c", .driver_data = tmp75c },
	{ .name = "tmp1075", .driver_data = tmp1075 },
	{ /* LIST END */ }
};
MODULE_DEVICE_TABLE(i2c, lm75_i2c_ids);

struct lm75_i3c_device {
	enum lm75_type type;
	const char *name;
};

static const struct lm75_i3c_device lm75_i3c_p3t1755 = {
	.name = "p3t1755",
	.type = p3t1755,
};

static const struct i3c_device_id lm75_i3c_ids[] = {
	I3C_DEVICE(0x011b, 0x152a, &lm75_i3c_p3t1755),
	{ /* LIST END */ }
};
MODULE_DEVICE_TABLE(i3c, lm75_i3c_ids);

static int lm75_i3c_probe(struct i3c_device *i3cdev)
{
	struct device *dev = i3cdev_to_dev(i3cdev);
	const struct lm75_i3c_device *id_data;
	struct regmap *regmap;

	regmap = devm_regmap_init(dev, &lm75_i3c_regmap_bus, i3cdev, &lm75_regmap_config);
	if (IS_ERR(regmap))
		return PTR_ERR(regmap);

	id_data = i3c_device_match_id(i3cdev, lm75_i3c_ids)->data;

	return lm75_generic_probe(dev, id_data->name, id_data->type, 0, regmap);
}

static const struct of_device_id lm75_of_match[] = {
	{
		.compatible = "adi,adt75",
		.data = (void *)adt75
	},
	{
		.compatible = "ams,as6200",
		.data = (void *)as6200
	},
	{
		.compatible = "atmel,at30ts74",
		.data = (void *)at30ts74
	},
	{
		.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,p3t1750",
		.data = (void *)p3t1750
	},
	{
		.compatible = "nxp,p3t1755",
		.data = (void *)p3t1755
	},
	{
		.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
	},
	{
		.compatible = "ti,tmp1075",
		.data = (void *)tmp1075
	},
	{ },
};
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;
	}

	strscpy(info->type, is_lm75a ? "lm75a" : "lm75", I2C_NAME_SIZE);

	return 0;
}

#ifdef CONFIG_PM
static int lm75_suspend(struct device *dev)
{
	struct lm75_data *data = dev_get_drvdata(dev);

	return regmap_update_bits(data->regmap, LM75_REG_CONF, LM75_SHUTDOWN, LM75_SHUTDOWN);
}

static int lm75_resume(struct device *dev)
{
	struct lm75_data *data = dev_get_drvdata(dev);

	return regmap_update_bits(data->regmap, LM75_REG_CONF, LM75_SHUTDOWN, 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_i2c_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "lm75",
		.of_match_table = lm75_of_match,
		.pm	= LM75_DEV_PM_OPS,
	},
	.probe		= lm75_i2c_probe,
	.id_table	= lm75_i2c_ids,
	.detect		= lm75_detect,
	.address_list	= normal_i2c,
};

static struct i3c_driver lm75_i3c_driver = {
	.driver = {
		.name = "lm75_i3c",
	},
	.probe = lm75_i3c_probe,
	.id_table = lm75_i3c_ids,
};

module_i3c_i2c_driver(lm75_i3c_driver, &lm75_i2c_driver)

MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
MODULE_DESCRIPTION("LM75 driver");
MODULE_LICENSE("GPL");