drivers/hwmon/adm1029.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * adm1029.c - Part of lm_sensors, Linux kernel modules for hardware monitoring
  *
  * Copyright (C) 2006 Corentin LABBE <clabbe.montjoie@gmail.com>
  *
  * Based on LM83 Driver by Jean Delvare <jdelvare@suse.de>
  *
  * Give only processor, motherboard temperatures and fan tachs
  * Very rare chip please let me know if you use it
  *
  * http://www.analog.com/UploadedFiles/Data_Sheets/ADM1029.pdf
  */

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

 /*
  * Addresses to scan
  */

 static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
 						0x2e, 0x2f, I2C_CLIENT_END
 };

 /*
  * The ADM1029 registers
  * Manufacturer ID is 0x41 for Analog Devices
  */

 #define ADM1029_REG_MAN_ID			0x0D
 #define ADM1029_REG_CHIP_ID			0x0E
 #define ADM1029_REG_CONFIG			0x01
 #define ADM1029_REG_NB_FAN_SUPPORT		0x02

 #define ADM1029_REG_TEMP_DEVICES_INSTALLED	0x06

 #define ADM1029_REG_LOCAL_TEMP			0xA0
 #define ADM1029_REG_REMOTE1_TEMP		0xA1
 #define ADM1029_REG_REMOTE2_TEMP		0xA2

 #define ADM1029_REG_LOCAL_TEMP_HIGH		0x90
 #define ADM1029_REG_REMOTE1_TEMP_HIGH		0x91
 #define ADM1029_REG_REMOTE2_TEMP_HIGH		0x92

 #define ADM1029_REG_LOCAL_TEMP_LOW		0x98
 #define ADM1029_REG_REMOTE1_TEMP_LOW		0x99
 #define ADM1029_REG_REMOTE2_TEMP_LOW		0x9A

 #define ADM1029_REG_FAN1			0x70
 #define ADM1029_REG_FAN2			0x71

 #define ADM1029_REG_FAN1_MIN			0x78
 #define ADM1029_REG_FAN2_MIN			0x79

 #define ADM1029_REG_FAN1_CONFIG			0x68
 #define ADM1029_REG_FAN2_CONFIG			0x69

 #define TEMP_FROM_REG(val)	((val) * 1000)

 #define DIV_FROM_REG(val)	(1 << (((val) >> 6) - 1))

 /* Registers to be checked by adm1029_update_device() */
 static const u8 ADM1029_REG_TEMP[] = {
 	ADM1029_REG_LOCAL_TEMP,
 	ADM1029_REG_REMOTE1_TEMP,
 	ADM1029_REG_REMOTE2_TEMP,
 	ADM1029_REG_LOCAL_TEMP_HIGH,
 	ADM1029_REG_REMOTE1_TEMP_HIGH,
 	ADM1029_REG_REMOTE2_TEMP_HIGH,
 	ADM1029_REG_LOCAL_TEMP_LOW,
 	ADM1029_REG_REMOTE1_TEMP_LOW,
 	ADM1029_REG_REMOTE2_TEMP_LOW,
 };

 static const u8 ADM1029_REG_FAN[] = {
 	ADM1029_REG_FAN1,
 	ADM1029_REG_FAN2,
 	ADM1029_REG_FAN1_MIN,
 	ADM1029_REG_FAN2_MIN,
 };

 static const u8 ADM1029_REG_FAN_DIV[] = {
 	ADM1029_REG_FAN1_CONFIG,
 	ADM1029_REG_FAN2_CONFIG,
 };

 /*
  * Client data (each client gets its own)
  */

 struct adm1029_data {
 	struct i2c_client *client;
 	struct mutex update_lock; /* protect register access */
 	bool valid;		/* false until following fields are valid */
 	unsigned long last_updated;	/* in jiffies */

 	/* registers values, signed for temperature, unsigned for other stuff */
 	s8 temp[ARRAY_SIZE(ADM1029_REG_TEMP)];
 	u8 fan[ARRAY_SIZE(ADM1029_REG_FAN)];
 	u8 fan_div[ARRAY_SIZE(ADM1029_REG_FAN_DIV)];
 };

 /*
  * function that update the status of the chips (temperature for example)
  */
 static struct adm1029_data *adm1029_update_device(struct device *dev)
 {
 	struct adm1029_data *data = dev_get_drvdata(dev);
 	struct i2c_client *client = data->client;

 	mutex_lock(&data->update_lock);
 	/*
 	 * Use the "cache" Luke, don't recheck values
 	 * if there are already checked not a long time later
 	 */
 	if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
 		int nr;

 		dev_dbg(&client->dev, "Updating adm1029 data\n");

 		for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_TEMP); nr++) {
 			data->temp[nr] =
 			    i2c_smbus_read_byte_data(client,
 						     ADM1029_REG_TEMP[nr]);
 		}
 		for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN); nr++) {
 			data->fan[nr] =
 			    i2c_smbus_read_byte_data(client,
 						     ADM1029_REG_FAN[nr]);
 		}
 		for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN_DIV); nr++) {
 			data->fan_div[nr] =
 			    i2c_smbus_read_byte_data(client,
 						     ADM1029_REG_FAN_DIV[nr]);
 		}

 		data->last_updated = jiffies;
 		data->valid = true;
 	}

 	mutex_unlock(&data->update_lock);

 	return data;
 }

 /*
  * Sysfs stuff
  */

 static ssize_t
 temp_show(struct device *dev, struct device_attribute *devattr, char *buf)
 {
 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 	struct adm1029_data *data = adm1029_update_device(dev);

 	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
 }

 static ssize_t
 fan_show(struct device *dev, struct device_attribute *devattr, char *buf)
 {
 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 	struct adm1029_data *data = adm1029_update_device(dev);
 	u16 val;

 	if (data->fan[attr->index] == 0 ||
 	    (data->fan_div[attr->index] & 0xC0) == 0 ||
 	    data->fan[attr->index] == 255) {
 		return sprintf(buf, "0\n");
 	}

 	val = 1880 * 120 / DIV_FROM_REG(data->fan_div[attr->index])
 	    / data->fan[attr->index];
 	return sprintf(buf, "%d\n", val);
 }

 static ssize_t
 fan_div_show(struct device *dev, struct device_attribute *devattr, char *buf)
 {
 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 	struct adm1029_data *data = adm1029_update_device(dev);

 	if ((data->fan_div[attr->index] & 0xC0) == 0)
 		return sprintf(buf, "0\n");
 	return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
 }

 static ssize_t fan_div_store(struct device *dev,
 			     struct device_attribute *devattr,
 			     const char *buf, size_t count)
 {
 	struct adm1029_data *data = dev_get_drvdata(dev);
 	struct i2c_client *client = data->client;
 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 	u8 reg;
 	long val;
 	int ret = kstrtol(buf, 10, &val);

 	if (ret < 0)
 		return ret;

 	mutex_lock(&data->update_lock);

 	/*Read actual config */
 	reg = i2c_smbus_read_byte_data(client,
 				       ADM1029_REG_FAN_DIV[attr->index]);

 	switch (val) {
 	case 1:
 		val = 1;
 		break;
 	case 2:
 		val = 2;
 		break;
 	case 4:
 		val = 3;
 		break;
 	default:
 		mutex_unlock(&data->update_lock);
 		dev_err(&client->dev,
 			"fan_div value %ld not supported. Choose one of 1, 2 or 4!\n",
 			val);
 		return -EINVAL;
 	}
 	/* Update the value */
 	reg = (reg & 0x3F) | (val << 6);

 	/* Update the cache */
 	data->fan_div[attr->index] = reg;

 	/* Write value */
 	i2c_smbus_write_byte_data(client,
 				  ADM1029_REG_FAN_DIV[attr->index], reg);
 	mutex_unlock(&data->update_lock);

 	return count;
 }

 /* Access rights on sysfs. */
 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
 static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);

 static SENSOR_DEVICE_ATTR_RO(temp1_max, temp, 3);
 static SENSOR_DEVICE_ATTR_RO(temp2_max, temp, 4);
 static SENSOR_DEVICE_ATTR_RO(temp3_max, temp, 5);

 static SENSOR_DEVICE_ATTR_RO(temp1_min, temp, 6);
 static SENSOR_DEVICE_ATTR_RO(temp2_min, temp, 7);
 static SENSOR_DEVICE_ATTR_RO(temp3_min, temp, 8);

 static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);
 static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);

 static SENSOR_DEVICE_ATTR_RO(fan1_min, fan, 2);
 static SENSOR_DEVICE_ATTR_RO(fan2_min, fan, 3);

 static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
 static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);

 static struct attribute *adm1029_attrs[] = {
 	&sensor_dev_attr_temp1_input.dev_attr.attr,
 	&sensor_dev_attr_temp1_min.dev_attr.attr,
 	&sensor_dev_attr_temp1_max.dev_attr.attr,
 	&sensor_dev_attr_temp2_input.dev_attr.attr,
 	&sensor_dev_attr_temp2_min.dev_attr.attr,
 	&sensor_dev_attr_temp2_max.dev_attr.attr,
 	&sensor_dev_attr_temp3_input.dev_attr.attr,
 	&sensor_dev_attr_temp3_min.dev_attr.attr,
 	&sensor_dev_attr_temp3_max.dev_attr.attr,
 	&sensor_dev_attr_fan1_input.dev_attr.attr,
 	&sensor_dev_attr_fan2_input.dev_attr.attr,
 	&sensor_dev_attr_fan1_min.dev_attr.attr,
 	&sensor_dev_attr_fan2_min.dev_attr.attr,
 	&sensor_dev_attr_fan1_div.dev_attr.attr,
 	&sensor_dev_attr_fan2_div.dev_attr.attr,
 	NULL
 };

 ATTRIBUTE_GROUPS(adm1029);

 /*
  * Real code
  */

 /* Return 0 if detection is successful, -ENODEV otherwise */
 static int adm1029_detect(struct i2c_client *client,
 			  struct i2c_board_info *info)
 {
 	struct i2c_adapter *adapter = client->adapter;
 	u8 man_id, chip_id, temp_devices_installed, nb_fan_support;

 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 		return -ENODEV;

 	/*
 	 * ADM1029 doesn't have CHIP ID, check just MAN ID
 	 * For better detection we check also ADM1029_TEMP_DEVICES_INSTALLED,
 	 * ADM1029_REG_NB_FAN_SUPPORT and compare it with possible values
 	 * documented
 	 */

 	man_id = i2c_smbus_read_byte_data(client, ADM1029_REG_MAN_ID);
 	chip_id = i2c_smbus_read_byte_data(client, ADM1029_REG_CHIP_ID);
 	temp_devices_installed = i2c_smbus_read_byte_data(client,
 					ADM1029_REG_TEMP_DEVICES_INSTALLED);
 	nb_fan_support = i2c_smbus_read_byte_data(client,
 						  ADM1029_REG_NB_FAN_SUPPORT);
 	/* 0x41 is Analog Devices */
 	if (man_id != 0x41 || (temp_devices_installed & 0xf9) != 0x01 ||
 	    nb_fan_support != 0x03)
 		return -ENODEV;

 	if ((chip_id & 0xF0) != 0x00) {
 		/*
 		 * There are no "official" CHIP ID, so actually
 		 * we use Major/Minor revision for that
 		 */
 		pr_info("Unknown major revision %x, please let us know\n",
 			chip_id);
 		return -ENODEV;
 	}

 	strscpy(info->type, "adm1029", I2C_NAME_SIZE);

 	return 0;
 }

 static int adm1029_init_client(struct i2c_client *client)
 {
 	u8 config;

 	config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
 	if ((config & 0x10) == 0) {
 		i2c_smbus_write_byte_data(client, ADM1029_REG_CONFIG,
 					  config | 0x10);
 	}
 	/* recheck config */
 	config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
 	if ((config & 0x10) == 0) {
 		dev_err(&client->dev, "Initialization failed!\n");
 		return 0;
 	}
 	return 1;
 }

 static int adm1029_probe(struct i2c_client *client)
 {
 	struct device *dev = &client->dev;
 	struct adm1029_data *data;
 	struct device *hwmon_dev;

 	data = devm_kzalloc(dev, sizeof(struct adm1029_data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;

 	data->client = client;
 	mutex_init(&data->update_lock);

 	/*
 	 * Initialize the ADM1029 chip
 	 * Check config register
 	 */
 	if (adm1029_init_client(client) == 0)
 		return -ENODEV;

 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 							   data,
 							   adm1029_groups);
 	return PTR_ERR_OR_ZERO(hwmon_dev);
 }

 static const struct i2c_device_id adm1029_id[] = {
 	{ "adm1029" },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, adm1029_id);

 static struct i2c_driver adm1029_driver = {
 	.class		= I2C_CLASS_HWMON,
 	.driver = {
 		.name = "adm1029",
 	},
 	.probe		= adm1029_probe,
 	.id_table	= adm1029_id,
 	.detect		= adm1029_detect,
 	.address_list	= normal_i2c,
 };

 module_i2c_driver(adm1029_driver);

 MODULE_AUTHOR("Corentin LABBE <clabbe.montjoie@gmail.com>");
 MODULE_DESCRIPTION("adm1029 driver");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* adm1029.c - Part of lm_sensors, Linux kernel modules for hardware monitoring
	*
	* Copyright (C) 2006 Corentin LABBE <clabbe.montjoie@gmail.com>
	*
	* Based on LM83 Driver by Jean Delvare <jdelvare@suse.de>
	*
	* Give only processor, motherboard temperatures and fan tachs
	* Very rare chip please let me know if you use it
	*
	* http://www.analog.com/UploadedFiles/Data_Sheets/ADM1029.pdf
	*/

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

	/*
	* Addresses to scan
	*/

	static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
	0x2e, 0x2f, I2C_CLIENT_END
	};

	/*
	* The ADM1029 registers
	* Manufacturer ID is 0x41 for Analog Devices
	*/

	#define ADM1029_REG_MAN_ID 0x0D
	#define ADM1029_REG_CHIP_ID 0x0E
	#define ADM1029_REG_CONFIG 0x01
	#define ADM1029_REG_NB_FAN_SUPPORT 0x02

	#define ADM1029_REG_TEMP_DEVICES_INSTALLED 0x06

	#define ADM1029_REG_LOCAL_TEMP 0xA0
	#define ADM1029_REG_REMOTE1_TEMP 0xA1
	#define ADM1029_REG_REMOTE2_TEMP 0xA2

	#define ADM1029_REG_LOCAL_TEMP_HIGH 0x90
	#define ADM1029_REG_REMOTE1_TEMP_HIGH 0x91
	#define ADM1029_REG_REMOTE2_TEMP_HIGH 0x92

	#define ADM1029_REG_LOCAL_TEMP_LOW 0x98
	#define ADM1029_REG_REMOTE1_TEMP_LOW 0x99
	#define ADM1029_REG_REMOTE2_TEMP_LOW 0x9A

	#define ADM1029_REG_FAN1 0x70
	#define ADM1029_REG_FAN2 0x71

	#define ADM1029_REG_FAN1_MIN 0x78
	#define ADM1029_REG_FAN2_MIN 0x79

	#define ADM1029_REG_FAN1_CONFIG 0x68
	#define ADM1029_REG_FAN2_CONFIG 0x69

	#define TEMP_FROM_REG(val) ((val) * 1000)

	#define DIV_FROM_REG(val) (1 << (((val) >> 6) - 1))

	/* Registers to be checked by adm1029_update_device() */
	static const u8 ADM1029_REG_TEMP[] = {
	ADM1029_REG_LOCAL_TEMP,
	ADM1029_REG_REMOTE1_TEMP,
	ADM1029_REG_REMOTE2_TEMP,
	ADM1029_REG_LOCAL_TEMP_HIGH,
	ADM1029_REG_REMOTE1_TEMP_HIGH,
	ADM1029_REG_REMOTE2_TEMP_HIGH,
	ADM1029_REG_LOCAL_TEMP_LOW,
	ADM1029_REG_REMOTE1_TEMP_LOW,
	ADM1029_REG_REMOTE2_TEMP_LOW,
	};

	static const u8 ADM1029_REG_FAN[] = {
	ADM1029_REG_FAN1,
	ADM1029_REG_FAN2,
	ADM1029_REG_FAN1_MIN,
	ADM1029_REG_FAN2_MIN,
	};

	static const u8 ADM1029_REG_FAN_DIV[] = {
	ADM1029_REG_FAN1_CONFIG,
	ADM1029_REG_FAN2_CONFIG,
	};

	/*
	* Client data (each client gets its own)
	*/

	struct adm1029_data {
	struct i2c_client *client;
	struct mutex update_lock; /* protect register access */
	bool valid; /* false until following fields are valid */
	unsigned long last_updated; /* in jiffies */

	/* registers values, signed for temperature, unsigned for other stuff */
	s8 temp[ARRAY_SIZE(ADM1029_REG_TEMP)];
	u8 fan[ARRAY_SIZE(ADM1029_REG_FAN)];
	u8 fan_div[ARRAY_SIZE(ADM1029_REG_FAN_DIV)];
	};

	/*
	* function that update the status of the chips (temperature for example)
	*/
	static struct adm1029_data adm1029_update_device(struct device dev)
	{
	struct adm1029_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;

	mutex_lock(&data->update_lock);
	/*
	* Use the "cache" Luke, don't recheck values
	* if there are already checked not a long time later
	*/
	if (time_after(jiffies, data->last_updated + HZ * 2) \|\| !data->valid) {
	int nr;

	dev_dbg(&client->dev, "Updating adm1029 data\n");

	for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_TEMP); nr++) {
	data->temp[nr] =
	i2c_smbus_read_byte_data(client,
	ADM1029_REG_TEMP[nr]);
	}
	for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN); nr++) {
	data->fan[nr] =
	i2c_smbus_read_byte_data(client,
	ADM1029_REG_FAN[nr]);
	}
	for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN_DIV); nr++) {
	data->fan_div[nr] =
	i2c_smbus_read_byte_data(client,
	ADM1029_REG_FAN_DIV[nr]);
	}

	data->last_updated = jiffies;
	data->valid = true;
	}

	mutex_unlock(&data->update_lock);

	return data;
	}

	/*
	* Sysfs stuff
	*/

	static ssize_t
	temp_show(struct device dev, struct device_attribute devattr, char *buf)
	{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct adm1029_data *data = adm1029_update_device(dev);

	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
	}

	static ssize_t
	fan_show(struct device dev, struct device_attribute devattr, char *buf)
	{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct adm1029_data *data = adm1029_update_device(dev);
	u16 val;

	if (data->fan[attr->index] == 0 \|\|
	(data->fan_div[attr->index] & 0xC0) == 0 \|\|
	data->fan[attr->index] == 255) {
	return sprintf(buf, "0\n");
	}

	val = 1880 * 120 / DIV_FROM_REG(data->fan_div[attr->index])
	/ data->fan[attr->index];
	return sprintf(buf, "%d\n", val);
	}

	static ssize_t
	fan_div_show(struct device dev, struct device_attribute devattr, char *buf)
	{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct adm1029_data *data = adm1029_update_device(dev);

	if ((data->fan_div[attr->index] & 0xC0) == 0)
	return sprintf(buf, "0\n");
	return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
	}

	static ssize_t fan_div_store(struct device *dev,
	struct device_attribute *devattr,
	const char *buf, size_t count)
	{
	struct adm1029_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	u8 reg;
	long val;
	int ret = kstrtol(buf, 10, &val);

	if (ret < 0)
	return ret;

	mutex_lock(&data->update_lock);

	/Read actual config /
	reg = i2c_smbus_read_byte_data(client,
	ADM1029_REG_FAN_DIV[attr->index]);

	switch (val) {
	case 1:
	val = 1;
	break;
	case 2:
	val = 2;
	break;
	case 4:
	val = 3;
	break;
	default:
	mutex_unlock(&data->update_lock);
	dev_err(&client->dev,
	"fan_div value %ld not supported. Choose one of 1, 2 or 4!\n",
	val);
	return -EINVAL;
	}
	/* Update the value */
	reg = (reg & 0x3F) \| (val << 6);

	/* Update the cache */
	data->fan_div[attr->index] = reg;

	/* Write value */
	i2c_smbus_write_byte_data(client,
	ADM1029_REG_FAN_DIV[attr->index], reg);
	mutex_unlock(&data->update_lock);

	return count;
	}

	/* Access rights on sysfs. */
	static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
	static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
	static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);

	static SENSOR_DEVICE_ATTR_RO(temp1_max, temp, 3);
	static SENSOR_DEVICE_ATTR_RO(temp2_max, temp, 4);
	static SENSOR_DEVICE_ATTR_RO(temp3_max, temp, 5);

	static SENSOR_DEVICE_ATTR_RO(temp1_min, temp, 6);
	static SENSOR_DEVICE_ATTR_RO(temp2_min, temp, 7);
	static SENSOR_DEVICE_ATTR_RO(temp3_min, temp, 8);

	static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);
	static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);

	static SENSOR_DEVICE_ATTR_RO(fan1_min, fan, 2);
	static SENSOR_DEVICE_ATTR_RO(fan2_min, fan, 3);

	static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
	static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);

	static struct attribute *adm1029_attrs[] = {
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp1_min.dev_attr.attr,
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp2_min.dev_attr.attr,
	&sensor_dev_attr_temp2_max.dev_attr.attr,
	&sensor_dev_attr_temp3_input.dev_attr.attr,
	&sensor_dev_attr_temp3_min.dev_attr.attr,
	&sensor_dev_attr_temp3_max.dev_attr.attr,
	&sensor_dev_attr_fan1_input.dev_attr.attr,
	&sensor_dev_attr_fan2_input.dev_attr.attr,
	&sensor_dev_attr_fan1_min.dev_attr.attr,
	&sensor_dev_attr_fan2_min.dev_attr.attr,
	&sensor_dev_attr_fan1_div.dev_attr.attr,
	&sensor_dev_attr_fan2_div.dev_attr.attr,
	NULL
	};

	ATTRIBUTE_GROUPS(adm1029);

	/*
	* Real code
	*/

	/* Return 0 if detection is successful, -ENODEV otherwise */
	static int adm1029_detect(struct i2c_client *client,
	struct i2c_board_info *info)
	{
	struct i2c_adapter *adapter = client->adapter;
	u8 man_id, chip_id, temp_devices_installed, nb_fan_support;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	return -ENODEV;

	/*
	* ADM1029 doesn't have CHIP ID, check just MAN ID
	* For better detection we check also ADM1029_TEMP_DEVICES_INSTALLED,
	* ADM1029_REG_NB_FAN_SUPPORT and compare it with possible values
	* documented
	*/

	man_id = i2c_smbus_read_byte_data(client, ADM1029_REG_MAN_ID);
	chip_id = i2c_smbus_read_byte_data(client, ADM1029_REG_CHIP_ID);
	temp_devices_installed = i2c_smbus_read_byte_data(client,
	ADM1029_REG_TEMP_DEVICES_INSTALLED);
	nb_fan_support = i2c_smbus_read_byte_data(client,
	ADM1029_REG_NB_FAN_SUPPORT);
	/* 0x41 is Analog Devices */
	if (man_id != 0x41 \|\| (temp_devices_installed & 0xf9) != 0x01 \|\|
	nb_fan_support != 0x03)
	return -ENODEV;

	if ((chip_id & 0xF0) != 0x00) {
	/*
	* There are no "official" CHIP ID, so actually
	* we use Major/Minor revision for that
	*/
	pr_info("Unknown major revision %x, please let us know\n",
	chip_id);
	return -ENODEV;
	}

	strscpy(info->type, "adm1029", I2C_NAME_SIZE);

	return 0;
	}

	static int adm1029_init_client(struct i2c_client *client)
	{
	u8 config;

	config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
	if ((config & 0x10) == 0) {
	i2c_smbus_write_byte_data(client, ADM1029_REG_CONFIG,
	config \| 0x10);
	}
	/* recheck config */
	config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
	if ((config & 0x10) == 0) {
	dev_err(&client->dev, "Initialization failed!\n");
	return 0;
	}
	return 1;
	}

	static int adm1029_probe(struct i2c_client *client)
	{
	struct device *dev = &client->dev;
	struct adm1029_data *data;
	struct device *hwmon_dev;

	data = devm_kzalloc(dev, sizeof(struct adm1029_data), GFP_KERNEL);
	if (!data)
	return -ENOMEM;

	data->client = client;
	mutex_init(&data->update_lock);

	/*
	* Initialize the ADM1029 chip
	* Check config register
	*/
	if (adm1029_init_client(client) == 0)
	return -ENODEV;

	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
	data,
	adm1029_groups);
	return PTR_ERR_OR_ZERO(hwmon_dev);
	}

	static const struct i2c_device_id adm1029_id[] = {
	{ "adm1029" },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, adm1029_id);

	static struct i2c_driver adm1029_driver = {
	.class = I2C_CLASS_HWMON,
	.driver = {
	.name = "adm1029",
	},
	.probe = adm1029_probe,
	.id_table = adm1029_id,
	.detect = adm1029_detect,
	.address_list = normal_i2c,
	};

	module_i2c_driver(adm1029_driver);

	MODULE_AUTHOR("Corentin LABBE <clabbe.montjoie@gmail.com>");
	MODULE_DESCRIPTION("adm1029 driver");
	MODULE_LICENSE("GPL v2");