drivers/hwmon/thmc50.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * thmc50.c - Part of lm_sensors, Linux kernel modules for hardware
  *	      monitoring
  * Copyright (C) 2007 Krzysztof Helt <krzysztof.h1@wp.pl>
  * Based on 2.4 driver by Frodo Looijaard <frodol@dds.nl> and
  * Philip Edelbrock <phil@netroedge.com>
  */

 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/i2c.h>
 #include <linux/hwmon.h>
 #include <linux/hwmon-sysfs.h>
 #include <linux/err.h>
 #include <linux/mutex.h>
 #include <linux/jiffies.h>

 MODULE_LICENSE("GPL");

 /* Addresses to scan */
 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };

 /* Insmod parameters */
 enum chips { thmc50, adm1022 };

 static unsigned short adm1022_temp3[16];
 static unsigned int adm1022_temp3_num;
 module_param_array(adm1022_temp3, ushort, &adm1022_temp3_num, 0);
 MODULE_PARM_DESC(adm1022_temp3,
 		 "List of adapter,address pairs to enable 3rd temperature (ADM1022 only)");

 /* Many THMC50 constants specified below */

 /* The THMC50 registers */
 #define THMC50_REG_CONF				0x40
 #define THMC50_REG_COMPANY_ID			0x3E
 #define THMC50_REG_DIE_CODE			0x3F
 #define THMC50_REG_ANALOG_OUT			0x19
 /*
  * The mirror status register cannot be used as
  * reading it does not clear alarms.
  */
 #define THMC50_REG_INTR				0x41

 static const u8 THMC50_REG_TEMP[] = { 0x27, 0x26, 0x20 };
 static const u8 THMC50_REG_TEMP_MIN[] = { 0x3A, 0x38, 0x2C };
 static const u8 THMC50_REG_TEMP_MAX[] = { 0x39, 0x37, 0x2B };
 static const u8 THMC50_REG_TEMP_CRITICAL[] = { 0x13, 0x14, 0x14 };
 static const u8 THMC50_REG_TEMP_DEFAULT[] = { 0x17, 0x18, 0x18 };

 #define THMC50_REG_CONF_nFANOFF			0x20
 #define THMC50_REG_CONF_PROGRAMMED		0x08

 /* Each client has this additional data */
 struct thmc50_data {
 	struct i2c_client *client;
 	const struct attribute_group *groups[3];

 	struct mutex update_lock;
 	enum chips type;
 	unsigned long last_updated;	/* In jiffies */
 	char has_temp3;		/* !=0 if it is ADM1022 in temp3 mode */
 	char valid;		/* !=0 if following fields are valid */

 	/* Register values */
 	s8 temp_input[3];
 	s8 temp_max[3];
 	s8 temp_min[3];
 	s8 temp_critical[3];
 	u8 analog_out;
 	u8 alarms;
 };

 static struct thmc50_data *thmc50_update_device(struct device *dev)
 {
 	struct thmc50_data *data = dev_get_drvdata(dev);
 	struct i2c_client *client = data->client;
 	int timeout = HZ / 5 + (data->type == thmc50 ? HZ : 0);

 	mutex_lock(&data->update_lock);

 	if (time_after(jiffies, data->last_updated + timeout)
 	    || !data->valid) {

 		int temps = data->has_temp3 ? 3 : 2;
 		int i;
 		int prog = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);

 		prog &= THMC50_REG_CONF_PROGRAMMED;

 		for (i = 0; i < temps; i++) {
 			data->temp_input[i] = i2c_smbus_read_byte_data(client,
 						THMC50_REG_TEMP[i]);
 			data->temp_max[i] = i2c_smbus_read_byte_data(client,
 						THMC50_REG_TEMP_MAX[i]);
 			data->temp_min[i] = i2c_smbus_read_byte_data(client,
 						THMC50_REG_TEMP_MIN[i]);
 			data->temp_critical[i] =
 				i2c_smbus_read_byte_data(client,
 					prog ? THMC50_REG_TEMP_CRITICAL[i]
 					     : THMC50_REG_TEMP_DEFAULT[i]);
 		}
 		data->analog_out =
 		    i2c_smbus_read_byte_data(client, THMC50_REG_ANALOG_OUT);
 		data->alarms =
 		    i2c_smbus_read_byte_data(client, THMC50_REG_INTR);
 		data->last_updated = jiffies;
 		data->valid = 1;
 	}

 	mutex_unlock(&data->update_lock);

 	return data;
 }

 static ssize_t analog_out_show(struct device *dev,
 			       struct device_attribute *attr, char *buf)
 {
 	struct thmc50_data *data = thmc50_update_device(dev);
 	return sprintf(buf, "%d\n", data->analog_out);
 }

 static ssize_t analog_out_store(struct device *dev,
 				struct device_attribute *attr,
 				const char *buf, size_t count)
 {
 	struct thmc50_data *data = dev_get_drvdata(dev);
 	struct i2c_client *client = data->client;
 	int config;
 	unsigned long tmp;
 	int err;

 	err = kstrtoul(buf, 10, &tmp);
 	if (err)
 		return err;

 	mutex_lock(&data->update_lock);
 	data->analog_out = clamp_val(tmp, 0, 255);
 	i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT,
 				  data->analog_out);

 	config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
 	if (data->analog_out == 0)
 		config &= ~THMC50_REG_CONF_nFANOFF;
 	else
 		config |= THMC50_REG_CONF_nFANOFF;
 	i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config);

 	mutex_unlock(&data->update_lock);
 	return count;
 }

 /* There is only one PWM mode = DC */
 static ssize_t pwm_mode_show(struct device *dev,
 			     struct device_attribute *attr, char *buf)
 {
 	return sprintf(buf, "0\n");
 }

 /* Temperatures */
 static ssize_t temp_show(struct device *dev, struct device_attribute *attr,
 			 char *buf)
 {
 	int nr = to_sensor_dev_attr(attr)->index;
 	struct thmc50_data *data = thmc50_update_device(dev);
 	return sprintf(buf, "%d\n", data->temp_input[nr] * 1000);
 }

 static ssize_t temp_min_show(struct device *dev,
 			     struct device_attribute *attr, char *buf)
 {
 	int nr = to_sensor_dev_attr(attr)->index;
 	struct thmc50_data *data = thmc50_update_device(dev);
 	return sprintf(buf, "%d\n", data->temp_min[nr] * 1000);
 }

 static ssize_t temp_min_store(struct device *dev,
 			      struct device_attribute *attr, const char *buf,
 			      size_t count)
 {
 	int nr = to_sensor_dev_attr(attr)->index;
 	struct thmc50_data *data = dev_get_drvdata(dev);
 	struct i2c_client *client = data->client;
 	long val;
 	int err;

 	err = kstrtol(buf, 10, &val);
 	if (err)
 		return err;

 	mutex_lock(&data->update_lock);
 	data->temp_min[nr] = clamp_val(val / 1000, -128, 127);
 	i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MIN[nr],
 				  data->temp_min[nr]);
 	mutex_unlock(&data->update_lock);
 	return count;
 }

 static ssize_t temp_max_show(struct device *dev,
 			     struct device_attribute *attr, char *buf)
 {
 	int nr = to_sensor_dev_attr(attr)->index;
 	struct thmc50_data *data = thmc50_update_device(dev);
 	return sprintf(buf, "%d\n", data->temp_max[nr] * 1000);
 }

 static ssize_t temp_max_store(struct device *dev,
 			      struct device_attribute *attr, const char *buf,
 			      size_t count)
 {
 	int nr = to_sensor_dev_attr(attr)->index;
 	struct thmc50_data *data = dev_get_drvdata(dev);
 	struct i2c_client *client = data->client;
 	long val;
 	int err;

 	err = kstrtol(buf, 10, &val);
 	if (err)
 		return err;

 	mutex_lock(&data->update_lock);
 	data->temp_max[nr] = clamp_val(val / 1000, -128, 127);
 	i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MAX[nr],
 				  data->temp_max[nr]);
 	mutex_unlock(&data->update_lock);
 	return count;
 }

 static ssize_t temp_critical_show(struct device *dev,
 				  struct device_attribute *attr, char *buf)
 {
 	int nr = to_sensor_dev_attr(attr)->index;
 	struct thmc50_data *data = thmc50_update_device(dev);
 	return sprintf(buf, "%d\n", data->temp_critical[nr] * 1000);
 }

 static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
 			  char *buf)
 {
 	int index = to_sensor_dev_attr(attr)->index;
 	struct thmc50_data *data = thmc50_update_device(dev);

 	return sprintf(buf, "%u\n", (data->alarms >> index) & 1);
 }

 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
 static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_min, 0);
 static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0);
 static SENSOR_DEVICE_ATTR_RO(temp1_crit, temp_critical, 0);
 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
 static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_min, 1);
 static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1);
 static SENSOR_DEVICE_ATTR_RO(temp2_crit, temp_critical, 1);
 static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
 static SENSOR_DEVICE_ATTR_RW(temp3_min, temp_min, 2);
 static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_max, 2);
 static SENSOR_DEVICE_ATTR_RO(temp3_crit, temp_critical, 2);

 static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 0);
 static SENSOR_DEVICE_ATTR_RO(temp2_alarm, alarm, 5);
 static SENSOR_DEVICE_ATTR_RO(temp3_alarm, alarm, 1);
 static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 7);
 static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 2);

 static SENSOR_DEVICE_ATTR_RW(pwm1, analog_out, 0);
 static SENSOR_DEVICE_ATTR_RO(pwm1_mode, pwm_mode, 0);

 static struct attribute *thmc50_attributes[] = {
 	&sensor_dev_attr_temp1_max.dev_attr.attr,
 	&sensor_dev_attr_temp1_min.dev_attr.attr,
 	&sensor_dev_attr_temp1_input.dev_attr.attr,
 	&sensor_dev_attr_temp1_crit.dev_attr.attr,
 	&sensor_dev_attr_temp1_alarm.dev_attr.attr,
 	&sensor_dev_attr_temp2_max.dev_attr.attr,
 	&sensor_dev_attr_temp2_min.dev_attr.attr,
 	&sensor_dev_attr_temp2_input.dev_attr.attr,
 	&sensor_dev_attr_temp2_crit.dev_attr.attr,
 	&sensor_dev_attr_temp2_alarm.dev_attr.attr,
 	&sensor_dev_attr_temp2_fault.dev_attr.attr,
 	&sensor_dev_attr_pwm1.dev_attr.attr,
 	&sensor_dev_attr_pwm1_mode.dev_attr.attr,
 	NULL
 };

 static const struct attribute_group thmc50_group = {
 	.attrs = thmc50_attributes,
 };

 /* for ADM1022 3rd temperature mode */
 static struct attribute *temp3_attributes[] = {
 	&sensor_dev_attr_temp3_max.dev_attr.attr,
 	&sensor_dev_attr_temp3_min.dev_attr.attr,
 	&sensor_dev_attr_temp3_input.dev_attr.attr,
 	&sensor_dev_attr_temp3_crit.dev_attr.attr,
 	&sensor_dev_attr_temp3_alarm.dev_attr.attr,
 	&sensor_dev_attr_temp3_fault.dev_attr.attr,
 	NULL
 };

 static const struct attribute_group temp3_group = {
 	.attrs = temp3_attributes,
 };

 /* Return 0 if detection is successful, -ENODEV otherwise */
 static int thmc50_detect(struct i2c_client *client,
 			 struct i2c_board_info *info)
 {
 	unsigned company;
 	unsigned revision;
 	unsigned config;
 	struct i2c_adapter *adapter = client->adapter;
 	const char *type_name;

 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
 		pr_debug("thmc50: detect failed, smbus byte data not supported!\n");
 		return -ENODEV;
 	}

 	pr_debug("thmc50: Probing for THMC50 at 0x%2X on bus %d\n",
 		 client->addr, i2c_adapter_id(client->adapter));

 	company = i2c_smbus_read_byte_data(client, THMC50_REG_COMPANY_ID);
 	revision = i2c_smbus_read_byte_data(client, THMC50_REG_DIE_CODE);
 	config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
 	if (revision < 0xc0 || (config & 0x10))
 		return -ENODEV;

 	if (company == 0x41) {
 		int id = i2c_adapter_id(client->adapter);
 		int i;

 		type_name = "adm1022";
 		for (i = 0; i + 1 < adm1022_temp3_num; i += 2)
 			if (adm1022_temp3[i] == id &&
 			    adm1022_temp3[i + 1] == client->addr) {
 				/* enable 2nd remote temp */
 				config |= (1 << 7);
 				i2c_smbus_write_byte_data(client,
 							  THMC50_REG_CONF,
 							  config);
 				break;
 			}
 	} else if (company == 0x49) {
 		type_name = "thmc50";
 	} else {
 		pr_debug("thmc50: Detection of THMC50/ADM1022 failed\n");
 		return -ENODEV;
 	}

 	pr_debug("thmc50: Detected %s (version %x, revision %x)\n",
 		 type_name, (revision >> 4) - 0xc, revision & 0xf);

 	strlcpy(info->type, type_name, I2C_NAME_SIZE);

 	return 0;
 }

 static void thmc50_init_client(struct thmc50_data *data)
 {
 	struct i2c_client *client = data->client;
 	int config;

 	data->analog_out = i2c_smbus_read_byte_data(client,
 						    THMC50_REG_ANALOG_OUT);
 	/* set up to at least 1 */
 	if (data->analog_out == 0) {
 		data->analog_out = 1;
 		i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT,
 					  data->analog_out);
 	}
 	config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
 	config |= 0x1;	/* start the chip if it is in standby mode */
 	if (data->type == adm1022 && (config & (1 << 7)))
 		data->has_temp3 = 1;
 	i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config);
 }

 static int thmc50_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
 {
 	struct device *dev = &client->dev;
 	struct thmc50_data *data;
 	struct device *hwmon_dev;
 	int idx = 0;

 	data = devm_kzalloc(dev, sizeof(struct thmc50_data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;

 	data->client = client;
 	data->type = id->driver_data;
 	mutex_init(&data->update_lock);

 	thmc50_init_client(data);

 	/* sysfs hooks */
 	data->groups[idx++] = &thmc50_group;

 	/* Register additional ADM1022 sysfs hooks */
 	if (data->has_temp3)
 		data->groups[idx++] = &temp3_group;

 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 							   data, data->groups);
 	return PTR_ERR_OR_ZERO(hwmon_dev);
 }

 static const struct i2c_device_id thmc50_id[] = {
 	{ "adm1022", adm1022 },
 	{ "thmc50", thmc50 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, thmc50_id);

 static struct i2c_driver thmc50_driver = {
 	.class = I2C_CLASS_HWMON,
 	.driver = {
 		.name = "thmc50",
 	},
 	.probe = thmc50_probe,
 	.id_table = thmc50_id,
 	.detect = thmc50_detect,
 	.address_list = normal_i2c,
 };

 module_i2c_driver(thmc50_driver);

 MODULE_AUTHOR("Krzysztof Helt <krzysztof.h1@wp.pl>");
 MODULE_DESCRIPTION("THMC50 driver");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* thmc50.c - Part of lm_sensors, Linux kernel modules for hardware
	* monitoring
	* Copyright (C) 2007 Krzysztof Helt <krzysztof.h1@wp.pl>
	* Based on 2.4 driver by Frodo Looijaard <frodol@dds.nl> and
	* Philip Edelbrock <phil@netroedge.com>
	*/

	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/slab.h>
	#include <linux/i2c.h>
	#include <linux/hwmon.h>
	#include <linux/hwmon-sysfs.h>
	#include <linux/err.h>
	#include <linux/mutex.h>
	#include <linux/jiffies.h>

	MODULE_LICENSE("GPL");

	/* Addresses to scan */
	static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };

	/* Insmod parameters */
	enum chips { thmc50, adm1022 };

	static unsigned short adm1022_temp3[16];
	static unsigned int adm1022_temp3_num;
	module_param_array(adm1022_temp3, ushort, &adm1022_temp3_num, 0);
	MODULE_PARM_DESC(adm1022_temp3,
	"List of adapter,address pairs to enable 3rd temperature (ADM1022 only)");

	/* Many THMC50 constants specified below */

	/* The THMC50 registers */
	#define THMC50_REG_CONF 0x40
	#define THMC50_REG_COMPANY_ID 0x3E
	#define THMC50_REG_DIE_CODE 0x3F
	#define THMC50_REG_ANALOG_OUT 0x19
	/*
	* The mirror status register cannot be used as
	* reading it does not clear alarms.
	*/
	#define THMC50_REG_INTR 0x41

	static const u8 THMC50_REG_TEMP[] = { 0x27, 0x26, 0x20 };
	static const u8 THMC50_REG_TEMP_MIN[] = { 0x3A, 0x38, 0x2C };
	static const u8 THMC50_REG_TEMP_MAX[] = { 0x39, 0x37, 0x2B };
	static const u8 THMC50_REG_TEMP_CRITICAL[] = { 0x13, 0x14, 0x14 };
	static const u8 THMC50_REG_TEMP_DEFAULT[] = { 0x17, 0x18, 0x18 };

	#define THMC50_REG_CONF_nFANOFF 0x20
	#define THMC50_REG_CONF_PROGRAMMED 0x08

	/* Each client has this additional data */
	struct thmc50_data {
	struct i2c_client *client;
	const struct attribute_group *groups[3];

	struct mutex update_lock;
	enum chips type;
	unsigned long last_updated; /* In jiffies */
	char has_temp3; /* !=0 if it is ADM1022 in temp3 mode */
	char valid; /* !=0 if following fields are valid */

	/* Register values */
	s8 temp_input[3];
	s8 temp_max[3];
	s8 temp_min[3];
	s8 temp_critical[3];
	u8 analog_out;
	u8 alarms;
	};

	static struct thmc50_data thmc50_update_device(struct device dev)
	{
	struct thmc50_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	int timeout = HZ / 5 + (data->type == thmc50 ? HZ : 0);

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + timeout)
	\|\| !data->valid) {

	int temps = data->has_temp3 ? 3 : 2;
	int i;
	int prog = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);

	prog &= THMC50_REG_CONF_PROGRAMMED;

	for (i = 0; i < temps; i++) {
	data->temp_input[i] = i2c_smbus_read_byte_data(client,
	THMC50_REG_TEMP[i]);
	data->temp_max[i] = i2c_smbus_read_byte_data(client,
	THMC50_REG_TEMP_MAX[i]);
	data->temp_min[i] = i2c_smbus_read_byte_data(client,
	THMC50_REG_TEMP_MIN[i]);
	data->temp_critical[i] =
	i2c_smbus_read_byte_data(client,
	prog ? THMC50_REG_TEMP_CRITICAL[i]
	: THMC50_REG_TEMP_DEFAULT[i]);
	}
	data->analog_out =
	i2c_smbus_read_byte_data(client, THMC50_REG_ANALOG_OUT);
	data->alarms =
	i2c_smbus_read_byte_data(client, THMC50_REG_INTR);
	data->last_updated = jiffies;
	data->valid = 1;
	}

	mutex_unlock(&data->update_lock);

	return data;
	}

	static ssize_t analog_out_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct thmc50_data *data = thmc50_update_device(dev);
	return sprintf(buf, "%d\n", data->analog_out);
	}

	static ssize_t analog_out_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t count)
	{
	struct thmc50_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	int config;
	unsigned long tmp;
	int err;

	err = kstrtoul(buf, 10, &tmp);
	if (err)
	return err;

	mutex_lock(&data->update_lock);
	data->analog_out = clamp_val(tmp, 0, 255);
	i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT,
	data->analog_out);

	config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
	if (data->analog_out == 0)
	config &= ~THMC50_REG_CONF_nFANOFF;
	else
	config \|= THMC50_REG_CONF_nFANOFF;
	i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config);

	mutex_unlock(&data->update_lock);
	return count;
	}

	/* There is only one PWM mode = DC */
	static ssize_t pwm_mode_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	return sprintf(buf, "0\n");
	}

	/* Temperatures */
	static ssize_t temp_show(struct device dev, struct device_attribute attr,
	char *buf)
	{
	int nr = to_sensor_dev_attr(attr)->index;
	struct thmc50_data *data = thmc50_update_device(dev);
	return sprintf(buf, "%d\n", data->temp_input[nr] * 1000);
	}

	static ssize_t temp_min_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	int nr = to_sensor_dev_attr(attr)->index;
	struct thmc50_data *data = thmc50_update_device(dev);
	return sprintf(buf, "%d\n", data->temp_min[nr] * 1000);
	}

	static ssize_t temp_min_store(struct device *dev,
	struct device_attribute attr, const char buf,
	size_t count)
	{
	int nr = to_sensor_dev_attr(attr)->index;
	struct thmc50_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	long val;
	int err;

	err = kstrtol(buf, 10, &val);
	if (err)
	return err;

	mutex_lock(&data->update_lock);
	data->temp_min[nr] = clamp_val(val / 1000, -128, 127);
	i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MIN[nr],
	data->temp_min[nr]);
	mutex_unlock(&data->update_lock);
	return count;
	}

	static ssize_t temp_max_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	int nr = to_sensor_dev_attr(attr)->index;
	struct thmc50_data *data = thmc50_update_device(dev);
	return sprintf(buf, "%d\n", data->temp_max[nr] * 1000);
	}

	static ssize_t temp_max_store(struct device *dev,
	struct device_attribute attr, const char buf,
	size_t count)
	{
	int nr = to_sensor_dev_attr(attr)->index;
	struct thmc50_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	long val;
	int err;

	err = kstrtol(buf, 10, &val);
	if (err)
	return err;

	mutex_lock(&data->update_lock);
	data->temp_max[nr] = clamp_val(val / 1000, -128, 127);
	i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MAX[nr],
	data->temp_max[nr]);
	mutex_unlock(&data->update_lock);
	return count;
	}

	static ssize_t temp_critical_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	int nr = to_sensor_dev_attr(attr)->index;
	struct thmc50_data *data = thmc50_update_device(dev);
	return sprintf(buf, "%d\n", data->temp_critical[nr] * 1000);
	}

	static ssize_t alarm_show(struct device dev, struct device_attribute attr,
	char *buf)
	{
	int index = to_sensor_dev_attr(attr)->index;
	struct thmc50_data *data = thmc50_update_device(dev);

	return sprintf(buf, "%u\n", (data->alarms >> index) & 1);
	}

	static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
	static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_min, 0);
	static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0);
	static SENSOR_DEVICE_ATTR_RO(temp1_crit, temp_critical, 0);
	static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
	static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_min, 1);
	static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1);
	static SENSOR_DEVICE_ATTR_RO(temp2_crit, temp_critical, 1);
	static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
	static SENSOR_DEVICE_ATTR_RW(temp3_min, temp_min, 2);
	static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_max, 2);
	static SENSOR_DEVICE_ATTR_RO(temp3_crit, temp_critical, 2);

	static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 0);
	static SENSOR_DEVICE_ATTR_RO(temp2_alarm, alarm, 5);
	static SENSOR_DEVICE_ATTR_RO(temp3_alarm, alarm, 1);
	static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 7);
	static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 2);

	static SENSOR_DEVICE_ATTR_RW(pwm1, analog_out, 0);
	static SENSOR_DEVICE_ATTR_RO(pwm1_mode, pwm_mode, 0);

	static struct attribute *thmc50_attributes[] = {
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp1_min.dev_attr.attr,
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	&sensor_dev_attr_temp1_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_max.dev_attr.attr,
	&sensor_dev_attr_temp2_min.dev_attr.attr,
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp2_crit.dev_attr.attr,
	&sensor_dev_attr_temp2_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_fault.dev_attr.attr,
	&sensor_dev_attr_pwm1.dev_attr.attr,
	&sensor_dev_attr_pwm1_mode.dev_attr.attr,
	NULL
	};

	static const struct attribute_group thmc50_group = {
	.attrs = thmc50_attributes,
	};

	/* for ADM1022 3rd temperature mode */
	static struct attribute *temp3_attributes[] = {
	&sensor_dev_attr_temp3_max.dev_attr.attr,
	&sensor_dev_attr_temp3_min.dev_attr.attr,
	&sensor_dev_attr_temp3_input.dev_attr.attr,
	&sensor_dev_attr_temp3_crit.dev_attr.attr,
	&sensor_dev_attr_temp3_alarm.dev_attr.attr,
	&sensor_dev_attr_temp3_fault.dev_attr.attr,
	NULL
	};

	static const struct attribute_group temp3_group = {
	.attrs = temp3_attributes,
	};

	/* Return 0 if detection is successful, -ENODEV otherwise */
	static int thmc50_detect(struct i2c_client *client,
	struct i2c_board_info *info)
	{
	unsigned company;
	unsigned revision;
	unsigned config;
	struct i2c_adapter *adapter = client->adapter;
	const char *type_name;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
	pr_debug("thmc50: detect failed, smbus byte data not supported!\n");
	return -ENODEV;
	}

	pr_debug("thmc50: Probing for THMC50 at 0x%2X on bus %d\n",
	client->addr, i2c_adapter_id(client->adapter));

	company = i2c_smbus_read_byte_data(client, THMC50_REG_COMPANY_ID);
	revision = i2c_smbus_read_byte_data(client, THMC50_REG_DIE_CODE);
	config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
	if (revision < 0xc0 \|\| (config & 0x10))
	return -ENODEV;

	if (company == 0x41) {
	int id = i2c_adapter_id(client->adapter);
	int i;

	type_name = "adm1022";
	for (i = 0; i + 1 < adm1022_temp3_num; i += 2)
	if (adm1022_temp3[i] == id &&
	adm1022_temp3[i + 1] == client->addr) {
	/* enable 2nd remote temp */
	config \|= (1 << 7);
	i2c_smbus_write_byte_data(client,
	THMC50_REG_CONF,
	config);
	break;
	}
	} else if (company == 0x49) {
	type_name = "thmc50";
	} else {
	pr_debug("thmc50: Detection of THMC50/ADM1022 failed\n");
	return -ENODEV;
	}

	pr_debug("thmc50: Detected %s (version %x, revision %x)\n",
	type_name, (revision >> 4) - 0xc, revision & 0xf);

	strlcpy(info->type, type_name, I2C_NAME_SIZE);

	return 0;
	}

	static void thmc50_init_client(struct thmc50_data *data)
	{
	struct i2c_client *client = data->client;
	int config;

	data->analog_out = i2c_smbus_read_byte_data(client,
	THMC50_REG_ANALOG_OUT);
	/* set up to at least 1 */
	if (data->analog_out == 0) {
	data->analog_out = 1;
	i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT,
	data->analog_out);
	}
	config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF);
	config \|= 0x1; /* start the chip if it is in standby mode */
	if (data->type == adm1022 && (config & (1 << 7)))
	data->has_temp3 = 1;
	i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config);
	}

	static int thmc50_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct device *dev = &client->dev;
	struct thmc50_data *data;
	struct device *hwmon_dev;
	int idx = 0;

	data = devm_kzalloc(dev, sizeof(struct thmc50_data), GFP_KERNEL);
	if (!data)
	return -ENOMEM;

	data->client = client;
	data->type = id->driver_data;
	mutex_init(&data->update_lock);

	thmc50_init_client(data);

	/* sysfs hooks */
	data->groups[idx++] = &thmc50_group;

	/* Register additional ADM1022 sysfs hooks */
	if (data->has_temp3)
	data->groups[idx++] = &temp3_group;

	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
	data, data->groups);
	return PTR_ERR_OR_ZERO(hwmon_dev);
	}

	static const struct i2c_device_id thmc50_id[] = {
	{ "adm1022", adm1022 },
	{ "thmc50", thmc50 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, thmc50_id);

	static struct i2c_driver thmc50_driver = {
	.class = I2C_CLASS_HWMON,
	.driver = {
	.name = "thmc50",
	},
	.probe = thmc50_probe,
	.id_table = thmc50_id,
	.detect = thmc50_detect,
	.address_list = normal_i2c,
	};

	module_i2c_driver(thmc50_driver);

	MODULE_AUTHOR("Krzysztof Helt <krzysztof.h1@wp.pl>");
	MODULE_DESCRIPTION("THMC50 driver");