[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 <corentin.labbe@geomatys.fr>
 *
 * Based on LM83 Driver by Jean Delvare <khali@linux-fr.org>
 *
 * 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,
};

/*
 * Functions declaration
 */

static int adm1029_probe(struct i2c_client *client,
			 const struct i2c_device_id *id);
static int adm1029_detect(struct i2c_client *client,
			  struct i2c_board_info *info);
static int adm1029_remove(struct i2c_client *client);
static struct adm1029_data *adm1029_update_device(struct device *dev);
static int adm1029_init_client(struct i2c_client *client);

/*
 * Driver data (common to all clients)
 */

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,
	.remove		= adm1029_remove,
	.id_table	= adm1029_id,
	.detect		= adm1029_detect,
	.address_list	= normal_i2c,
};

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

struct adm1029_data {
	struct device *hwmon_dev;
	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)];
};

/*
 * 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 i2c_client *client = to_i2c_client(dev);
	struct adm1029_data *data = i2c_get_clientdata(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);

	/* 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_attributes[] = {
	&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
};

static const struct attribute_group adm1029_group = {
	.attrs = adm1029_attributes,
};

/*
 * 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("adm1029: 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_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct adm1029_data *data;
	int err;

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

	i2c_set_clientdata(client, data);
	mutex_init(&data->update_lock);

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

	/* Register sysfs hooks */
	err = sysfs_create_group(&client->dev.kobj, &adm1029_group);
	if (err)
		return err;

	data->hwmon_dev = hwmon_device_register(&client->dev);
	if (IS_ERR(data->hwmon_dev)) {
		err = PTR_ERR(data->hwmon_dev);
		goto exit_remove_files;
	}

	return 0;

 exit_remove_files:
	sysfs_remove_group(&client->dev.kobj, &adm1029_group);
	return err;
}

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_remove(struct i2c_client *client)
{
	struct adm1029_data *data = i2c_get_clientdata(client);

	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&client->dev.kobj, &adm1029_group);

	return 0;
}

/*
 * function that update the status of the chips (temperature for example)
 */
static struct adm1029_data *adm1029_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct adm1029_data *data = i2c_get_clientdata(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;
}

module_i2c_driver(adm1029_driver);

MODULE_AUTHOR("Corentin LABBE <corentin.labbe@geomatys.fr>");
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	*
	4	* Copyright (C) 2006 Corentin LABBE <corentin.labbe@geomatys.fr>
	5	*
	6	* Based on LM83 Driver by Jean Delvare <khali@linux-fr.org>
	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
	108	/*
	109	* Functions declaration
	110	*/
	111
9c97fb4d JD	112	static int adm1029_probe(struct i2c_client *client,
9c97fb4d JD	113	const struct i2c_device_id *id);
310ec792	114	static int adm1029_detect(struct i2c_client *client,
9c97fb4d JD	115	struct i2c_board_info *info);
9c97fb4d JD	116	static int adm1029_remove(struct i2c_client *client);
cae2caae CL	117	static struct adm1029_data adm1029_update_device(struct device dev);
	118	static int adm1029_init_client(struct i2c_client *client);
	119
	120	/*
	121	* Driver data (common to all clients)
	122	*/
	123
9c97fb4d	124	static const struct i2c_device_id adm1029_id[] = {
1f86df49	125	{ "adm1029", 0 },
9c97fb4d JD	126	{ }
	127	};
	128	MODULE_DEVICE_TABLE(i2c, adm1029_id);
	129
cae2caae	130	static struct i2c_driver adm1029_driver = {
9c97fb4d	131	.class = I2C_CLASS_HWMON,
cae2caae CL	132	.driver = {
	133	.name = "adm1029",
	134	},
9c97fb4d JD	135	.probe = adm1029_probe,
	136	.remove = adm1029_remove,
	137	.id_table = adm1029_id,
	138	.detect = adm1029_detect,
c3813d6a	139	.address_list = normal_i2c,
cae2caae CL	140	};
	141
	142	/*
	143	* Client data (each client gets its own)
	144	*/
	145
	146	struct adm1029_data {
1beeffe4	147	struct device *hwmon_dev;
cae2caae CL	148	struct mutex update_lock;
	149	char valid; /* zero until following fields are valid */
	150	unsigned long last_updated; /* in jiffies */
	151
	152	/* registers values, signed for temperature, unsigned for other stuff */
	153	s8 temp[ARRAY_SIZE(ADM1029_REG_TEMP)];
	154	u8 fan[ARRAY_SIZE(ADM1029_REG_FAN)];
	155	u8 fan_div[ARRAY_SIZE(ADM1029_REG_FAN_DIV)];
	156	};
	157
	158	/*
	159	* Sysfs stuff
	160	*/
	161
	162	static ssize_t
	163	show_temp(struct device dev, struct device_attribute devattr, char *buf)
	164	{
	165	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	166	struct adm1029_data *data = adm1029_update_device(dev);
	167	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
	168	}
	169
	170	static ssize_t
	171	show_fan(struct device dev, struct device_attribute devattr, char *buf)
	172	{
	173	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	174	struct adm1029_data *data = adm1029_update_device(dev);
	175	u16 val;
366716e6 CL	176	if (data->fan[attr->index] == 0
366716e6 CL	177	\|\| (data->fan_div[attr->index] & 0xC0) == 0
cae2caae CL	178	\|\| data->fan[attr->index] == 255) {
	179	return sprintf(buf, "0\n");
	180	}
	181
	182	val = 1880 * 120 / DIV_FROM_REG(data->fan_div[attr->index])
	183	/ data->fan[attr->index];
	184	return sprintf(buf, "%d\n", val);
	185	}
	186
	187	static ssize_t
	188	show_fan_div(struct device dev, struct device_attribute devattr, char *buf)
	189	{
	190	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	191	struct adm1029_data *data = adm1029_update_device(dev);
366716e6	192	if ((data->fan_div[attr->index] & 0xC0) == 0)
cae2caae CL	193	return sprintf(buf, "0\n");
	194	return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
	195	}
	196
	197	static ssize_t set_fan_div(struct device *dev,
	198	struct device_attribute devattr, const char buf, size_t count)
	199	{
	200	struct i2c_client *client = to_i2c_client(dev);
	201	struct adm1029_data *data = i2c_get_clientdata(client);
	202	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
cae2caae	203	u8 reg;
08f50907 FM	204	long val;
	205	int ret = kstrtol(buf, 10, &val);
	206	if (ret < 0)
	207	return ret;
cae2caae CL	208
	209	mutex_lock(&data->update_lock);
	210
	211	/Read actual config /
	212	reg = i2c_smbus_read_byte_data(client,
	213	ADM1029_REG_FAN_DIV[attr->index]);
	214
	215	switch (val) {
	216	case 1:
	217	val = 1;
	218	break;
	219	case 2:
	220	val = 2;
	221	break;
	222	case 4:
	223	val = 3;
	224	break;
	225	default:
	226	mutex_unlock(&data->update_lock);
	227	dev_err(&client->dev, "fan_div value %ld not "
	228	"supported. Choose one of 1, 2 or 4!\n", val);
	229	return -EINVAL;
	230	}
	231	/* Update the value */
	232	reg = (reg & 0x3F) \| (val << 6);
	233
	234	/* Write value */
	235	i2c_smbus_write_byte_data(client,
	236	ADM1029_REG_FAN_DIV[attr->index], reg);
	237	mutex_unlock(&data->update_lock);
	238
	239	return count;
	240	}
	241
	242	/*
94b991d4 GR	243	* Access rights on sysfs. S_IRUGO: Is Readable by User, Group and Others
	244	* S_IWUSR: Is Writable by User.
	245	*/
cae2caae CL	246	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
	247	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
	248	static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
	249
	250	static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, 3);
	251	static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO, show_temp, NULL, 4);
	252	static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp, NULL, 5);
	253
	254	static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO, show_temp, NULL, 6);
	255	static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO, show_temp, NULL, 7);
	256	static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO, show_temp, NULL, 8);
	257
	258	static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
	259	static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
	260
	261	static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO, show_fan, NULL, 2);
	262	static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO, show_fan, NULL, 3);
	263
	264	static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO \| S_IWUSR,
	265	show_fan_div, set_fan_div, 0);
	266	static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO \| S_IWUSR,
	267	show_fan_div, set_fan_div, 1);
	268
	269	static struct attribute *adm1029_attributes[] = {
	270	&sensor_dev_attr_temp1_input.dev_attr.attr,
	271	&sensor_dev_attr_temp1_min.dev_attr.attr,
	272	&sensor_dev_attr_temp1_max.dev_attr.attr,
	273	&sensor_dev_attr_temp2_input.dev_attr.attr,
	274	&sensor_dev_attr_temp2_min.dev_attr.attr,
	275	&sensor_dev_attr_temp2_max.dev_attr.attr,
	276	&sensor_dev_attr_temp3_input.dev_attr.attr,
	277	&sensor_dev_attr_temp3_min.dev_attr.attr,
	278	&sensor_dev_attr_temp3_max.dev_attr.attr,
	279	&sensor_dev_attr_fan1_input.dev_attr.attr,
	280	&sensor_dev_attr_fan2_input.dev_attr.attr,
	281	&sensor_dev_attr_fan1_min.dev_attr.attr,
	282	&sensor_dev_attr_fan2_min.dev_attr.attr,
	283	&sensor_dev_attr_fan1_div.dev_attr.attr,
	284	&sensor_dev_attr_fan2_div.dev_attr.attr,
	285	NULL
	286	};
	287
	288	static const struct attribute_group adm1029_group = {
	289	.attrs = adm1029_attributes,
	290	};
	291
	292	/*
	293	* Real code
	294	*/
	295
9c97fb4d	296	/* Return 0 if detection is successful, -ENODEV otherwise */
310ec792	297	static int adm1029_detect(struct i2c_client *client,
9c97fb4d	298	struct i2c_board_info *info)
cae2caae	299	{
9c97fb4d	300	struct i2c_adapter *adapter = client->adapter;
52df6440	301	u8 man_id, chip_id, temp_devices_installed, nb_fan_support;
cae2caae	302
cae2caae	303	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
9c97fb4d	304	return -ENODEV;
cae2caae	305
94b991d4 GR	306	/*
94b991d4 GR	307	* ADM1029 doesn't have CHIP ID, check just MAN ID
cae2caae CL	308	* For better detection we check also ADM1029_TEMP_DEVICES_INSTALLED,
	309	* ADM1029_REG_NB_FAN_SUPPORT and compare it with possible values
	310	* documented
	311	*/
	312
52df6440 JD	313	man_id = i2c_smbus_read_byte_data(client, ADM1029_REG_MAN_ID);
	314	chip_id = i2c_smbus_read_byte_data(client, ADM1029_REG_CHIP_ID);
	315	temp_devices_installed = i2c_smbus_read_byte_data(client,
cae2caae	316	ADM1029_REG_TEMP_DEVICES_INSTALLED);
52df6440	317	nb_fan_support = i2c_smbus_read_byte_data(client,
cae2caae	318	ADM1029_REG_NB_FAN_SUPPORT);
52df6440 JD	319	/* 0x41 is Analog Devices */
	320	if (man_id != 0x41 \|\| (temp_devices_installed & 0xf9) != 0x01
	321	\|\| nb_fan_support != 0x03)
	322	return -ENODEV;
	323
	324	if ((chip_id & 0xF0) != 0x00) {
94b991d4 GR	325	/*
	326	* There are no "official" CHIP ID, so actually
	327	* we use Major/Minor revision for that
	328	*/
52df6440 JD	329	pr_info("adm1029: Unknown major revision %x, "
	330	"please let us know\n", chip_id);
	331	return -ENODEV;
cae2caae	332	}
52df6440	333
9c97fb4d	334	strlcpy(info->type, "adm1029", I2C_NAME_SIZE);
cae2caae	335
9c97fb4d JD	336	return 0;
	337	}
	338
	339	static int adm1029_probe(struct i2c_client *client,
	340	const struct i2c_device_id *id)
	341	{
	342	struct adm1029_data *data;
	343	int err;
	344
08940b8a GR	345	data = devm_kzalloc(&client->dev, sizeof(struct adm1029_data),
	346	GFP_KERNEL);
	347	if (!data)
	348	return -ENOMEM;
cae2caae	349
9c97fb4d	350	i2c_set_clientdata(client, data);
cae2caae CL	351	mutex_init(&data->update_lock);
cae2caae CL	352
cae2caae CL	353	/*
	354	* Initialize the ADM1029 chip
	355	* Check config register
	356	*/
08940b8a GR	357	if (adm1029_init_client(client) == 0)
08940b8a GR	358	return -ENODEV;
cae2caae CL	359
cae2caae CL	360	/* Register sysfs hooks */
08f50907 FM	361	err = sysfs_create_group(&client->dev.kobj, &adm1029_group);
08f50907 FM	362	if (err)
08940b8a	363	return err;
cae2caae	364
1beeffe4 TJ	365	data->hwmon_dev = hwmon_device_register(&client->dev);
	366	if (IS_ERR(data->hwmon_dev)) {
	367	err = PTR_ERR(data->hwmon_dev);
cae2caae CL	368	goto exit_remove_files;
	369	}
	370
	371	return 0;
	372
	373	exit_remove_files:
	374	sysfs_remove_group(&client->dev.kobj, &adm1029_group);
cae2caae CL	375	return err;
	376	}
	377
	378	static int adm1029_init_client(struct i2c_client *client)
	379	{
	380	u8 config;
	381	config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
	382	if ((config & 0x10) == 0) {
	383	i2c_smbus_write_byte_data(client, ADM1029_REG_CONFIG,
	384	config \| 0x10);
	385	}
	386	/* recheck config */
	387	config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
	388	if ((config & 0x10) == 0) {
	389	dev_err(&client->dev, "Initialization failed!\n");
	390	return 0;
	391	}
	392	return 1;
	393	}
	394
9c97fb4d	395	static int adm1029_remove(struct i2c_client *client)
cae2caae CL	396	{
cae2caae CL	397	struct adm1029_data *data = i2c_get_clientdata(client);
cae2caae	398
1beeffe4	399	hwmon_device_unregister(data->hwmon_dev);
cae2caae CL	400	sysfs_remove_group(&client->dev.kobj, &adm1029_group);
cae2caae CL	401
cae2caae CL	402	return 0;
	403	}
	404
	405	/*
94b991d4 GR	406	* function that update the status of the chips (temperature for example)
94b991d4 GR	407	*/
cae2caae CL	408	static struct adm1029_data adm1029_update_device(struct device dev)
	409	{
	410	struct i2c_client *client = to_i2c_client(dev);
	411	struct adm1029_data *data = i2c_get_clientdata(client);
	412
	413	mutex_lock(&data->update_lock);
	414	/*
	415	* Use the "cache" Luke, don't recheck values
	416	* if there are already checked not a long time later
	417	*/
	418	if (time_after(jiffies, data->last_updated + HZ * 2)
	419	\|\| !data->valid) {
	420	int nr;
	421
	422	dev_dbg(&client->dev, "Updating adm1029 data\n");
	423
	424	for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_TEMP); nr++) {
	425	data->temp[nr] =
	426	i2c_smbus_read_byte_data(client,
	427	ADM1029_REG_TEMP[nr]);
	428	}
	429	for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN); nr++) {
	430	data->fan[nr] =
	431	i2c_smbus_read_byte_data(client,
	432	ADM1029_REG_FAN[nr]);
	433	}
	434	for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN_DIV); nr++) {
	435	data->fan_div[nr] =
	436	i2c_smbus_read_byte_data(client,
	437	ADM1029_REG_FAN_DIV[nr]);
	438	}
	439
	440	data->last_updated = jiffies;
	441	data->valid = 1;
	442	}
	443
	444	mutex_unlock(&data->update_lock);
	445
	446	return data;
	447	}
	448
f0967eea	449	module_i2c_driver(adm1029_driver);
cae2caae CL	450
	451	MODULE_AUTHOR("Corentin LABBE <corentin.labbe@geomatys.fr>");
	452	MODULE_DESCRIPTION("adm1029 driver");
	453	MODULE_LICENSE("GPL v2");