[linux-2.6-block.git] / drivers / hwmon / adm1029.c

/*
 * 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
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation version 2 of the License
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#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;
	char valid;		/* zero 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 = 1;
	}

	mutex_unlock(&data->update_lock);

	return data;
}

/*
 * Sysfs stuff
 */

static ssize_t
show_temp(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
show_fan(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
show_fan_div(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 set_fan_div(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. S_IRUGO: Is Readable by User, Group and Others
 *			   S_IWUSR: Is Writable by User.
 */
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);

static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, 3);
static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO, show_temp, NULL, 4);
static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp, NULL, 5);

static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO, show_temp, NULL, 6);
static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO, show_temp, NULL, 7);
static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO, show_temp, NULL, 8);

static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);

static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO, show_fan, NULL, 2);
static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO, show_fan, NULL, 3);

static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
			  show_fan_div, set_fan_div, 0);
static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR,
			  show_fan_div, set_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;
	}

	strlcpy(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,
			 const struct i2c_device_id *id)
{
	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", 0 },
	{ }
};
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");
Commit	Line	Data
cae2caae CL	1	/*
	2	* adm1029.c - Part of lm_sensors, Linux kernel modules for hardware monitoring
	3	*
962a75a2	4	* Copyright (C) 2006 Corentin LABBE <clabbe.montjoie@gmail.com>
cae2caae	5	*
7c81c60f	6	* Based on LM83 Driver by Jean Delvare <jdelvare@suse.de>
cae2caae CL	7	*
	8	* Give only processor, motherboard temperatures and fan tachs
	9	* Very rare chip please let me know if you use it
	10	*
	11	* http://www.analog.com/UploadedFiles/Data_Sheets/ADM1029.pdf
	12	*
	13	*
	14	* This program is free software; you can redistribute it and/or modify
	15	* it under the terms of the GNU General Public License as published by
	16	* the Free Software Foundation version 2 of the License
	17	*
	18	* This program is distributed in the hope that it will be useful,
	19	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	20	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	21	* GNU General Public License for more details.
	22	*
	23	* You should have received a copy of the GNU General Public License
	24	* along with this program; if not, write to the Free Software
	25	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	26	*/
	27
	28	#include <linux/module.h>
	29	#include <linux/init.h>
	30	#include <linux/slab.h>
	31	#include <linux/jiffies.h>
	32	#include <linux/i2c.h>
	33	#include <linux/hwmon-sysfs.h>
	34	#include <linux/hwmon.h>
	35	#include <linux/err.h>
	36	#include <linux/mutex.h>
	37
	38	/*
	39	* Addresses to scan
	40	*/
	41
25e9c86d MH	42	static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
25e9c86d MH	43	0x2e, 0x2f, I2C_CLIENT_END
cae2caae CL	44	};
cae2caae CL	45
cae2caae CL	46	/*
	47	* The ADM1029 registers
	48	* Manufacturer ID is 0x41 for Analog Devices
	49	*/
	50
	51	#define ADM1029_REG_MAN_ID 0x0D
	52	#define ADM1029_REG_CHIP_ID 0x0E
	53	#define ADM1029_REG_CONFIG 0x01
	54	#define ADM1029_REG_NB_FAN_SUPPORT 0x02
	55
	56	#define ADM1029_REG_TEMP_DEVICES_INSTALLED 0x06
	57
	58	#define ADM1029_REG_LOCAL_TEMP 0xA0
	59	#define ADM1029_REG_REMOTE1_TEMP 0xA1
	60	#define ADM1029_REG_REMOTE2_TEMP 0xA2
	61
	62	#define ADM1029_REG_LOCAL_TEMP_HIGH 0x90
	63	#define ADM1029_REG_REMOTE1_TEMP_HIGH 0x91
	64	#define ADM1029_REG_REMOTE2_TEMP_HIGH 0x92
	65
	66	#define ADM1029_REG_LOCAL_TEMP_LOW 0x98
	67	#define ADM1029_REG_REMOTE1_TEMP_LOW 0x99
	68	#define ADM1029_REG_REMOTE2_TEMP_LOW 0x9A
	69
	70	#define ADM1029_REG_FAN1 0x70
	71	#define ADM1029_REG_FAN2 0x71
	72
	73	#define ADM1029_REG_FAN1_MIN 0x78
	74	#define ADM1029_REG_FAN2_MIN 0x79
	75
	76	#define ADM1029_REG_FAN1_CONFIG 0x68
	77	#define ADM1029_REG_FAN2_CONFIG 0x69
	78
	79	#define TEMP_FROM_REG(val) ((val) * 1000)
	80
08f50907	81	#define DIV_FROM_REG(val) (1 << (((val) >> 6) - 1))
cae2caae CL	82
	83	/* Registers to be checked by adm1029_update_device() */
	84	static const u8 ADM1029_REG_TEMP[] = {
	85	ADM1029_REG_LOCAL_TEMP,
	86	ADM1029_REG_REMOTE1_TEMP,
	87	ADM1029_REG_REMOTE2_TEMP,
	88	ADM1029_REG_LOCAL_TEMP_HIGH,
	89	ADM1029_REG_REMOTE1_TEMP_HIGH,
	90	ADM1029_REG_REMOTE2_TEMP_HIGH,
	91	ADM1029_REG_LOCAL_TEMP_LOW,
	92	ADM1029_REG_REMOTE1_TEMP_LOW,
	93	ADM1029_REG_REMOTE2_TEMP_LOW,
	94	};
	95
	96	static const u8 ADM1029_REG_FAN[] = {
	97	ADM1029_REG_FAN1,
	98	ADM1029_REG_FAN2,
	99	ADM1029_REG_FAN1_MIN,
	100	ADM1029_REG_FAN2_MIN,
	101	};
	102
	103	static const u8 ADM1029_REG_FAN_DIV[] = {
	104	ADM1029_REG_FAN1_CONFIG,
	105	ADM1029_REG_FAN2_CONFIG,
	106	};
	107
cae2caae CL	108	/*
	109	* Client data (each client gets its own)
	110	*/
	111
	112	struct adm1029_data {
4fd5233f	113	struct i2c_client *client;
cae2caae CL	114	struct mutex update_lock;
	115	char valid; /* zero until following fields are valid */
	116	unsigned long last_updated; /* in jiffies */
	117
	118	/* registers values, signed for temperature, unsigned for other stuff */
	119	s8 temp[ARRAY_SIZE(ADM1029_REG_TEMP)];
	120	u8 fan[ARRAY_SIZE(ADM1029_REG_FAN)];
	121	u8 fan_div[ARRAY_SIZE(ADM1029_REG_FAN_DIV)];
	122	};
	123
b12e484e AL	124	/*
	125	* function that update the status of the chips (temperature for example)
	126	*/
	127	static struct adm1029_data adm1029_update_device(struct device dev)
	128	{
4fd5233f AL	129	struct adm1029_data *data = dev_get_drvdata(dev);
4fd5233f AL	130	struct i2c_client *client = data->client;
b12e484e AL	131
	132	mutex_lock(&data->update_lock);
	133	/*
	134	* Use the "cache" Luke, don't recheck values
	135	* if there are already checked not a long time later
	136	*/
	137	if (time_after(jiffies, data->last_updated + HZ * 2)
	138	\|\| !data->valid) {
	139	int nr;
	140
	141	dev_dbg(&client->dev, "Updating adm1029 data\n");
	142
	143	for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_TEMP); nr++) {
	144	data->temp[nr] =
	145	i2c_smbus_read_byte_data(client,
	146	ADM1029_REG_TEMP[nr]);
	147	}
	148	for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN); nr++) {
	149	data->fan[nr] =
	150	i2c_smbus_read_byte_data(client,
	151	ADM1029_REG_FAN[nr]);
	152	}
	153	for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN_DIV); nr++) {
	154	data->fan_div[nr] =
	155	i2c_smbus_read_byte_data(client,
	156	ADM1029_REG_FAN_DIV[nr]);
	157	}
	158
	159	data->last_updated = jiffies;
	160	data->valid = 1;
	161	}
	162
	163	mutex_unlock(&data->update_lock);
	164
	165	return data;
	166	}
	167
cae2caae CL	168	/*
	169	* Sysfs stuff
	170	*/
	171
	172	static ssize_t
	173	show_temp(struct device dev, struct device_attribute devattr, char *buf)
	174	{
	175	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	176	struct adm1029_data *data = adm1029_update_device(dev);
	177	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
	178	}
	179
	180	static ssize_t
	181	show_fan(struct device dev, struct device_attribute devattr, char *buf)
	182	{
	183	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	184	struct adm1029_data *data = adm1029_update_device(dev);
	185	u16 val;
366716e6 CL	186	if (data->fan[attr->index] == 0
366716e6 CL	187	\|\| (data->fan_div[attr->index] & 0xC0) == 0
cae2caae CL	188	\|\| data->fan[attr->index] == 255) {
	189	return sprintf(buf, "0\n");
	190	}
	191
	192	val = 1880 * 120 / DIV_FROM_REG(data->fan_div[attr->index])
	193	/ data->fan[attr->index];
	194	return sprintf(buf, "%d\n", val);
	195	}
	196
	197	static ssize_t
	198	show_fan_div(struct device dev, struct device_attribute devattr, char *buf)
	199	{
	200	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	201	struct adm1029_data *data = adm1029_update_device(dev);
366716e6	202	if ((data->fan_div[attr->index] & 0xC0) == 0)
cae2caae CL	203	return sprintf(buf, "0\n");
	204	return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
	205	}
	206
	207	static ssize_t set_fan_div(struct device *dev,
	208	struct device_attribute devattr, const char buf, size_t count)
	209	{
4fd5233f AL	210	struct adm1029_data *data = dev_get_drvdata(dev);
4fd5233f AL	211	struct i2c_client *client = data->client;
cae2caae	212	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
cae2caae	213	u8 reg;
08f50907 FM	214	long val;
	215	int ret = kstrtol(buf, 10, &val);
	216	if (ret < 0)
	217	return ret;
cae2caae CL	218
	219	mutex_lock(&data->update_lock);
	220
	221	/Read actual config /
	222	reg = i2c_smbus_read_byte_data(client,
	223	ADM1029_REG_FAN_DIV[attr->index]);
	224
	225	switch (val) {
	226	case 1:
	227	val = 1;
	228	break;
	229	case 2:
	230	val = 2;
	231	break;
	232	case 4:
	233	val = 3;
	234	break;
	235	default:
	236	mutex_unlock(&data->update_lock);
b55f3757 GR	237	dev_err(&client->dev,
	238	"fan_div value %ld not supported. Choose one of 1, 2 or 4!\n",
	239	val);
cae2caae CL	240	return -EINVAL;
	241	}
	242	/* Update the value */
	243	reg = (reg & 0x3F) \| (val << 6);
	244
1035a9e3 AL	245	/* Update the cache */
	246	data->fan_div[attr->index] = reg;
	247
cae2caae CL	248	/* Write value */
	249	i2c_smbus_write_byte_data(client,
	250	ADM1029_REG_FAN_DIV[attr->index], reg);
	251	mutex_unlock(&data->update_lock);
	252
	253	return count;
	254	}
	255
	256	/*
94b991d4 GR	257	* Access rights on sysfs. S_IRUGO: Is Readable by User, Group and Others
	258	* S_IWUSR: Is Writable by User.
	259	*/
cae2caae CL	260	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
	261	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
	262	static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
	263
	264	static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, 3);
	265	static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO, show_temp, NULL, 4);
	266	static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp, NULL, 5);
	267
	268	static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO, show_temp, NULL, 6);
	269	static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO, show_temp, NULL, 7);
	270	static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO, show_temp, NULL, 8);
	271
	272	static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
	273	static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
	274
	275	static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO, show_fan, NULL, 2);
	276	static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO, show_fan, NULL, 3);
	277
	278	static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO \| S_IWUSR,
	279	show_fan_div, set_fan_div, 0);
	280	static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO \| S_IWUSR,
	281	show_fan_div, set_fan_div, 1);
	282
4fd5233f	283	static struct attribute *adm1029_attrs[] = {
cae2caae CL	284	&sensor_dev_attr_temp1_input.dev_attr.attr,
	285	&sensor_dev_attr_temp1_min.dev_attr.attr,
	286	&sensor_dev_attr_temp1_max.dev_attr.attr,
	287	&sensor_dev_attr_temp2_input.dev_attr.attr,
	288	&sensor_dev_attr_temp2_min.dev_attr.attr,
	289	&sensor_dev_attr_temp2_max.dev_attr.attr,
	290	&sensor_dev_attr_temp3_input.dev_attr.attr,
	291	&sensor_dev_attr_temp3_min.dev_attr.attr,
	292	&sensor_dev_attr_temp3_max.dev_attr.attr,
	293	&sensor_dev_attr_fan1_input.dev_attr.attr,
	294	&sensor_dev_attr_fan2_input.dev_attr.attr,
	295	&sensor_dev_attr_fan1_min.dev_attr.attr,
	296	&sensor_dev_attr_fan2_min.dev_attr.attr,
	297	&sensor_dev_attr_fan1_div.dev_attr.attr,
	298	&sensor_dev_attr_fan2_div.dev_attr.attr,
	299	NULL
	300	};
	301
4fd5233f	302	ATTRIBUTE_GROUPS(adm1029);
cae2caae CL	303
	304	/*
	305	* Real code
	306	*/
	307
9c97fb4d	308	/* Return 0 if detection is successful, -ENODEV otherwise */
310ec792	309	static int adm1029_detect(struct i2c_client *client,
9c97fb4d	310	struct i2c_board_info *info)
cae2caae	311	{
9c97fb4d	312	struct i2c_adapter *adapter = client->adapter;
52df6440	313	u8 man_id, chip_id, temp_devices_installed, nb_fan_support;
cae2caae	314
cae2caae	315	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
9c97fb4d	316	return -ENODEV;
cae2caae	317
94b991d4 GR	318	/*
94b991d4 GR	319	* ADM1029 doesn't have CHIP ID, check just MAN ID
cae2caae CL	320	* For better detection we check also ADM1029_TEMP_DEVICES_INSTALLED,
	321	* ADM1029_REG_NB_FAN_SUPPORT and compare it with possible values
	322	* documented
	323	*/
	324
52df6440 JD	325	man_id = i2c_smbus_read_byte_data(client, ADM1029_REG_MAN_ID);
	326	chip_id = i2c_smbus_read_byte_data(client, ADM1029_REG_CHIP_ID);
	327	temp_devices_installed = i2c_smbus_read_byte_data(client,
cae2caae	328	ADM1029_REG_TEMP_DEVICES_INSTALLED);
52df6440	329	nb_fan_support = i2c_smbus_read_byte_data(client,
cae2caae	330	ADM1029_REG_NB_FAN_SUPPORT);
52df6440 JD	331	/* 0x41 is Analog Devices */
	332	if (man_id != 0x41 \|\| (temp_devices_installed & 0xf9) != 0x01
	333	\|\| nb_fan_support != 0x03)
	334	return -ENODEV;
	335
	336	if ((chip_id & 0xF0) != 0x00) {
94b991d4 GR	337	/*
	338	* There are no "official" CHIP ID, so actually
	339	* we use Major/Minor revision for that
	340	*/
b55f3757 GR	341	pr_info("Unknown major revision %x, please let us know\n",
b55f3757 GR	342	chip_id);
52df6440	343	return -ENODEV;
cae2caae	344	}
52df6440	345
9c97fb4d	346	strlcpy(info->type, "adm1029", I2C_NAME_SIZE);
cae2caae	347
9c97fb4d JD	348	return 0;
	349	}
	350
b12e484e AL	351	static int adm1029_init_client(struct i2c_client *client)
	352	{
	353	u8 config;
	354
	355	config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
	356	if ((config & 0x10) == 0) {
	357	i2c_smbus_write_byte_data(client, ADM1029_REG_CONFIG,
	358	config \| 0x10);
	359	}
	360	/* recheck config */
	361	config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
	362	if ((config & 0x10) == 0) {
	363	dev_err(&client->dev, "Initialization failed!\n");
	364	return 0;
	365	}
	366	return 1;
	367	}
	368
9c97fb4d JD	369	static int adm1029_probe(struct i2c_client *client,
	370	const struct i2c_device_id *id)
	371	{
4fd5233f	372	struct device *dev = &client->dev;
9c97fb4d	373	struct adm1029_data *data;
4fd5233f	374	struct device *hwmon_dev;
9c97fb4d	375
4fd5233f	376	data = devm_kzalloc(dev, sizeof(struct adm1029_data), GFP_KERNEL);
08940b8a GR	377	if (!data)
08940b8a GR	378	return -ENOMEM;
cae2caae	379
4fd5233f	380	data->client = client;
cae2caae CL	381	mutex_init(&data->update_lock);
cae2caae CL	382
cae2caae CL	383	/*
	384	* Initialize the ADM1029 chip
	385	* Check config register
	386	*/
08940b8a GR	387	if (adm1029_init_client(client) == 0)
08940b8a GR	388	return -ENODEV;
cae2caae	389
4fd5233f AL	390	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
	391	data,
	392	adm1029_groups);
	393	return PTR_ERR_OR_ZERO(hwmon_dev);
cae2caae CL	394	}
cae2caae CL	395
b12e484e AL	396	static const struct i2c_device_id adm1029_id[] = {
	397	{ "adm1029", 0 },
	398	{ }
	399	};
	400	MODULE_DEVICE_TABLE(i2c, adm1029_id);
cae2caae	401
b12e484e AL	402	static struct i2c_driver adm1029_driver = {
	403	.class = I2C_CLASS_HWMON,
	404	.driver = {
	405	.name = "adm1029",
	406	},
	407	.probe = adm1029_probe,
b12e484e AL	408	.id_table = adm1029_id,
	409	.detect = adm1029_detect,
	410	.address_list = normal_i2c,
	411	};
cae2caae	412
f0967eea	413	module_i2c_driver(adm1029_driver);
cae2caae	414
962a75a2	415	MODULE_AUTHOR("Corentin LABBE <clabbe.montjoie@gmail.com>");
cae2caae CL	416	MODULE_DESCRIPTION("adm1029 driver");
cae2caae CL	417	MODULE_LICENSE("GPL v2");