[linux-2.6-block.git] / drivers / hwmon / w83l785ts.c

/*
 * w83l785ts.c - Part of lm_sensors, Linux kernel modules for hardware
 *               monitoring
 * Copyright (C) 2003-2004  Jean Delvare <khali@linux-fr.org>
 *
 * Inspired from the lm83 driver. The W83L785TS-S is a sensor chip made
 * by Winbond. It reports a single external temperature with a 1 deg
 * resolution and a 3 deg accuracy. Datasheet can be obtained from
 * Winbond's website at:
 *   http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W83L785TS-S.pdf
 *
 * Ported to Linux 2.6 by Wolfgang Ziegler <nuppla@gmx.at> and Jean Delvare
 * <khali@linux-fr.org>.
 *
 * Thanks to James Bolt <james@evilpenguin.com> for benchmarking the read
 * error handling mechanism.
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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/delay.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>

/* How many retries on register read error */
#define MAX_RETRIES	5

/*
 * Address to scan
 * Address is fully defined internally and cannot be changed.
 */

static const unsigned short normal_i2c[] = { 0x2e, I2C_CLIENT_END };

/*
 * Insmod parameters
 */

I2C_CLIENT_INSMOD_1(w83l785ts);

/*
 * The W83L785TS-S registers
 * Manufacturer ID is 0x5CA3 for Winbond.
 */

#define W83L785TS_REG_MAN_ID1		0x4D
#define W83L785TS_REG_MAN_ID2		0x4C
#define W83L785TS_REG_CHIP_ID		0x4E
#define W83L785TS_REG_CONFIG		0x40
#define W83L785TS_REG_TYPE		0x52
#define W83L785TS_REG_TEMP		0x27
#define W83L785TS_REG_TEMP_OVER		0x53 /* not sure about this one */

/*
 * Conversions
 * The W83L785TS-S uses signed 8-bit values.
 */

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

/*
 * Functions declaration
 */

static int w83l785ts_probe(struct i2c_client *client,
			   const struct i2c_device_id *id);
static int w83l785ts_detect(struct i2c_client *client, int kind,
			    struct i2c_board_info *info);
static int w83l785ts_remove(struct i2c_client *client);
static u8 w83l785ts_read_value(struct i2c_client *client, u8 reg, u8 defval);
static struct w83l785ts_data *w83l785ts_update_device(struct device *dev);

/*
 * Driver data (common to all clients)
 */
 
static const struct i2c_device_id w83l785ts_id[] = {
	{ "w83l785ts", w83l785ts },
	{ }
};
MODULE_DEVICE_TABLE(i2c, w83l785ts_id);

static struct i2c_driver w83l785ts_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "w83l785ts",
	},
	.probe		= w83l785ts_probe,
	.remove		= w83l785ts_remove,
	.id_table	= w83l785ts_id,
	.detect		= w83l785ts_detect,
	.address_data	= &addr_data,
};

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

struct w83l785ts_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 */
	s8 temp[2]; /* 0: input
		       1: critical limit */
};

/*
 * 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 w83l785ts_data *data = w83l785ts_update_device(dev);
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
}

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, 1);

/*
 * Real code
 */

/* Return 0 if detection is successful, -ENODEV otherwise */
static int w83l785ts_detect(struct i2c_client *new_client, int kind,
			    struct i2c_board_info *info)
{
	struct i2c_adapter *adapter = new_client->adapter;

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

	/*
	 * Now we do the remaining detection. A negative kind means that
	 * the driver was loaded with no force parameter (default), so we
	 * must both detect and identify the chip (actually there is only
	 * one possible kind of chip for now, W83L785TS-S). A zero kind means
	 * that the driver was loaded with the force parameter, the detection
	 * step shall be skipped. A positive kind means that the driver
	 * was loaded with the force parameter and a given kind of chip is
	 * requested, so both the detection and the identification steps
	 * are skipped.
	 */
	if (kind < 0) { /* detection */
		if (((w83l785ts_read_value(new_client,
		      W83L785TS_REG_CONFIG, 0) & 0x80) != 0x00)
		 || ((w83l785ts_read_value(new_client,
		      W83L785TS_REG_TYPE, 0) & 0xFC) != 0x00)) {
			dev_dbg(&adapter->dev,
				"W83L785TS-S detection failed at 0x%02x.\n",
				new_client->addr);
			return -ENODEV;
		}
	}

	if (kind <= 0) { /* identification */
		u16 man_id;
		u8 chip_id;

		man_id = (w83l785ts_read_value(new_client,
			 W83L785TS_REG_MAN_ID1, 0) << 8) +
			 w83l785ts_read_value(new_client,
			 W83L785TS_REG_MAN_ID2, 0);
		chip_id = w83l785ts_read_value(new_client,
			  W83L785TS_REG_CHIP_ID, 0);

		if (man_id == 0x5CA3) { /* Winbond */
			if (chip_id == 0x70) { /* W83L785TS-S */
				kind = w83l785ts;			
			}
		}
	
		if (kind <= 0) { /* identification failed */
			dev_info(&adapter->dev,
				 "Unsupported chip (man_id=0x%04X, "
				 "chip_id=0x%02X).\n", man_id, chip_id);
			return -ENODEV;
		}
	}

	strlcpy(info->type, "w83l785ts", I2C_NAME_SIZE);

	return 0;
}

static int w83l785ts_probe(struct i2c_client *new_client,
			   const struct i2c_device_id *id)
{
	struct w83l785ts_data *data;
	int err = 0;

	data = kzalloc(sizeof(struct w83l785ts_data), GFP_KERNEL);
	if (!data) {
		err = -ENOMEM;
		goto exit;
	}

	i2c_set_clientdata(new_client, data);
	data->valid = 0;
	mutex_init(&data->update_lock);

	/* Default values in case the first read fails (unlikely). */
	data->temp[1] = data->temp[0] = 0;

	/*
	 * Initialize the W83L785TS chip
	 * Nothing yet, assume it is already started.
	 */

	err = device_create_file(&new_client->dev,
				 &sensor_dev_attr_temp1_input.dev_attr);
	if (err)
		goto exit_remove;

	err = device_create_file(&new_client->dev,
				 &sensor_dev_attr_temp1_max.dev_attr);
	if (err)
		goto exit_remove;

	/* Register sysfs hooks */
	data->hwmon_dev = hwmon_device_register(&new_client->dev);
	if (IS_ERR(data->hwmon_dev)) {
		err = PTR_ERR(data->hwmon_dev);
		goto exit_remove;
	}

	return 0;

exit_remove:
	device_remove_file(&new_client->dev,
			   &sensor_dev_attr_temp1_input.dev_attr);
	device_remove_file(&new_client->dev,
			   &sensor_dev_attr_temp1_max.dev_attr);
	kfree(data);
exit:
	return err;
}

static int w83l785ts_remove(struct i2c_client *client)
{
	struct w83l785ts_data *data = i2c_get_clientdata(client);

	hwmon_device_unregister(data->hwmon_dev);
	device_remove_file(&client->dev,
			   &sensor_dev_attr_temp1_input.dev_attr);
	device_remove_file(&client->dev,
			   &sensor_dev_attr_temp1_max.dev_attr);

	kfree(data);
	return 0;
}

static u8 w83l785ts_read_value(struct i2c_client *client, u8 reg, u8 defval)
{
	int value, i;
	struct device *dev;
	const char *prefix;

	/* We might be called during detection, at which point the client
	   isn't yet fully initialized, so we can't use dev_dbg on it */
	if (i2c_get_clientdata(client)) {
		dev = &client->dev;
		prefix = "";
	} else {
		dev = &client->adapter->dev;
		prefix = "w83l785ts: ";
	}

	/* Frequent read errors have been reported on Asus boards, so we
	 * retry on read errors. If it still fails (unlikely), return the
	 * default value requested by the caller. */
	for (i = 1; i <= MAX_RETRIES; i++) {
		value = i2c_smbus_read_byte_data(client, reg);
		if (value >= 0) {
			dev_dbg(dev, "%sRead 0x%02x from register 0x%02x.\n",
				prefix, value, reg);
			return value;
		}
		dev_dbg(dev, "%sRead failed, will retry in %d.\n", prefix, i);
		msleep(i);
	}

	dev_err(dev, "%sCouldn't read value from register 0x%02x.\n", prefix,
		reg);
	return defval;
}

static struct w83l785ts_data *w83l785ts_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct w83l785ts_data *data = i2c_get_clientdata(client);

	mutex_lock(&data->update_lock);

	if (!data->valid || time_after(jiffies, data->last_updated + HZ * 2)) {
		dev_dbg(&client->dev, "Updating w83l785ts data.\n");
		data->temp[0] = w83l785ts_read_value(client,
				W83L785TS_REG_TEMP, data->temp[0]);
		data->temp[1] = w83l785ts_read_value(client,
				W83L785TS_REG_TEMP_OVER, data->temp[1]);

		data->last_updated = jiffies;
		data->valid = 1;
	}

	mutex_unlock(&data->update_lock);

	return data;
}

static int __init sensors_w83l785ts_init(void)
{
	return i2c_add_driver(&w83l785ts_driver);
}

static void __exit sensors_w83l785ts_exit(void)
{
	i2c_del_driver(&w83l785ts_driver);
}

MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
MODULE_DESCRIPTION("W83L785TS-S driver");
MODULE_LICENSE("GPL");

module_init(sensors_w83l785ts_init);
module_exit(sensors_w83l785ts_exit);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* w83l785ts.c - Part of lm_sensors, Linux kernel modules for hardware
	3	* monitoring
	4	* Copyright (C) 2003-2004 Jean Delvare <khali@linux-fr.org>
	5	*
	6	* Inspired from the lm83 driver. The W83L785TS-S is a sensor chip made
	7	* by Winbond. It reports a single external temperature with a 1 deg
	8	* resolution and a 3 deg accuracy. Datasheet can be obtained from
	9	* Winbond's website at:
	10	* http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W83L785TS-S.pdf
	11	*
	12	* Ported to Linux 2.6 by Wolfgang Ziegler <nuppla@gmx.at> and Jean Delvare
	13	* <khali@linux-fr.org>.
	14	*
	15	* Thanks to James Bolt <james@evilpenguin.com> for benchmarking the read
	16	* error handling mechanism.
	17	*
	18	* This program is free software; you can redistribute it and/or modify
	19	* it under the terms of the GNU General Public License as published by
	20	* the Free Software Foundation; either version 2 of the License, or
	21	* (at your option) any later version.
	22	*
	23	* This program is distributed in the hope that it will be useful,
	24	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	25	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	26	* GNU General Public License for more details.
	27	*
	28	* You should have received a copy of the GNU General Public License
	29	* along with this program; if not, write to the Free Software
	30	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	31	*/
	32
1da177e4 LT	33	#include <linux/module.h>
	34	#include <linux/delay.h>
	35	#include <linux/init.h>
	36	#include <linux/slab.h>
	37	#include <linux/jiffies.h>
	38	#include <linux/i2c.h>
943b0830	39	#include <linux/hwmon.h>
709439a2	40	#include <linux/hwmon-sysfs.h>
943b0830	41	#include <linux/err.h>
9a61bf63	42	#include <linux/mutex.h>
1da177e4 LT	43
	44	/* How many retries on register read error */
	45	#define MAX_RETRIES 5
	46
	47	/*
	48	* Address to scan
	49	* Address is fully defined internally and cannot be changed.
	50	*/
	51
25e9c86d	52	static const unsigned short normal_i2c[] = { 0x2e, I2C_CLIENT_END };
1da177e4 LT	53
	54	/*
	55	* Insmod parameters
	56	*/
	57
f4b50261	58	I2C_CLIENT_INSMOD_1(w83l785ts);
1da177e4 LT	59
	60	/*
	61	* The W83L785TS-S registers
	62	* Manufacturer ID is 0x5CA3 for Winbond.
	63	*/
	64
	65	#define W83L785TS_REG_MAN_ID1 0x4D
	66	#define W83L785TS_REG_MAN_ID2 0x4C
	67	#define W83L785TS_REG_CHIP_ID 0x4E
	68	#define W83L785TS_REG_CONFIG 0x40
	69	#define W83L785TS_REG_TYPE 0x52
	70	#define W83L785TS_REG_TEMP 0x27
	71	#define W83L785TS_REG_TEMP_OVER 0x53 /* not sure about this one */
	72
	73	/*
	74	* Conversions
	75	* The W83L785TS-S uses signed 8-bit values.
	76	*/
	77
cb929eae	78	#define TEMP_FROM_REG(val) ((val) * 1000)
1da177e4 LT	79
	80	/*
	81	* Functions declaration
	82	*/
	83
dc18a418 JD	84	static int w83l785ts_probe(struct i2c_client *client,
	85	const struct i2c_device_id *id);
	86	static int w83l785ts_detect(struct i2c_client *client, int kind,
	87	struct i2c_board_info *info);
	88	static int w83l785ts_remove(struct i2c_client *client);
1da177e4 LT	89	static u8 w83l785ts_read_value(struct i2c_client *client, u8 reg, u8 defval);
	90	static struct w83l785ts_data w83l785ts_update_device(struct device dev);
	91
	92	/*
	93	* Driver data (common to all clients)
	94	*/
	95
dc18a418 JD	96	static const struct i2c_device_id w83l785ts_id[] = {
	97	{ "w83l785ts", w83l785ts },
	98	{ }
	99	};
	100	MODULE_DEVICE_TABLE(i2c, w83l785ts_id);
	101
1da177e4	102	static struct i2c_driver w83l785ts_driver = {
dc18a418	103	.class = I2C_CLASS_HWMON,
cdaf7934	104	.driver = {
cdaf7934 LR	105	.name = "w83l785ts",
cdaf7934 LR	106	},
dc18a418 JD	107	.probe = w83l785ts_probe,
	108	.remove = w83l785ts_remove,
	109	.id_table = w83l785ts_id,
	110	.detect = w83l785ts_detect,
	111	.address_data = &addr_data,
1da177e4 LT	112	};
	113
	114	/*
	115	* Client data (each client gets its own)
	116	*/
	117
	118	struct w83l785ts_data {
1beeffe4	119	struct device *hwmon_dev;
9a61bf63	120	struct mutex update_lock;
1da177e4 LT	121	char valid; /* zero until following fields are valid */
	122	unsigned long last_updated; /* in jiffies */
	123
	124	/* registers values */
cb929eae	125	s8 temp[2]; /* 0: input
709439a2	126	1: critical limit */
1da177e4 LT	127	};
	128
	129	/*
	130	* Sysfs stuff
	131	*/
	132
709439a2 JD	133	static ssize_t show_temp(struct device dev, struct device_attribute devattr,
709439a2 JD	134	char *buf)
1da177e4	135	{
709439a2	136	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
1da177e4	137	struct w83l785ts_data *data = w83l785ts_update_device(dev);
709439a2	138	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
1da177e4 LT	139	}
1da177e4 LT	140
709439a2 JD	141	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
709439a2 JD	142	static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, 1);
1da177e4 LT	143
	144	/*
	145	* Real code
	146	*/
	147
dc18a418 JD	148	/* Return 0 if detection is successful, -ENODEV otherwise */
	149	static int w83l785ts_detect(struct i2c_client *new_client, int kind,
	150	struct i2c_board_info *info)
1da177e4	151	{
dc18a418	152	struct i2c_adapter *adapter = new_client->adapter;
1da177e4 LT	153
1da177e4 LT	154	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
dc18a418	155	return -ENODEV;
1da177e4 LT	156
	157	/*
	158	* Now we do the remaining detection. A negative kind means that
	159	* the driver was loaded with no force parameter (default), so we
	160	* must both detect and identify the chip (actually there is only
	161	* one possible kind of chip for now, W83L785TS-S). A zero kind means
	162	* that the driver was loaded with the force parameter, the detection
	163	* step shall be skipped. A positive kind means that the driver
	164	* was loaded with the force parameter and a given kind of chip is
	165	* requested, so both the detection and the identification steps
	166	* are skipped.
	167	*/
	168	if (kind < 0) { /* detection */
	169	if (((w83l785ts_read_value(new_client,
	170	W83L785TS_REG_CONFIG, 0) & 0x80) != 0x00)
	171	\|\| ((w83l785ts_read_value(new_client,
	172	W83L785TS_REG_TYPE, 0) & 0xFC) != 0x00)) {
	173	dev_dbg(&adapter->dev,
	174	"W83L785TS-S detection failed at 0x%02x.\n",
dc18a418 JD	175	new_client->addr);
dc18a418 JD	176	return -ENODEV;
1da177e4 LT	177	}
	178	}
	179
	180	if (kind <= 0) { /* identification */
	181	u16 man_id;
	182	u8 chip_id;
	183
	184	man_id = (w83l785ts_read_value(new_client,
	185	W83L785TS_REG_MAN_ID1, 0) << 8) +
	186	w83l785ts_read_value(new_client,
	187	W83L785TS_REG_MAN_ID2, 0);
	188	chip_id = w83l785ts_read_value(new_client,
	189	W83L785TS_REG_CHIP_ID, 0);
	190
	191	if (man_id == 0x5CA3) { /* Winbond */
	192	if (chip_id == 0x70) { /* W83L785TS-S */
	193	kind = w83l785ts;
	194	}
	195	}
	196
	197	if (kind <= 0) { /* identification failed */
	198	dev_info(&adapter->dev,
	199	"Unsupported chip (man_id=0x%04X, "
	200	"chip_id=0x%02X).\n", man_id, chip_id);
dc18a418	201	return -ENODEV;
1da177e4 LT	202	}
	203	}
	204
dc18a418 JD	205	strlcpy(info->type, "w83l785ts", I2C_NAME_SIZE);
	206
	207	return 0;
	208	}
	209
	210	static int w83l785ts_probe(struct i2c_client *new_client,
	211	const struct i2c_device_id *id)
	212	{
	213	struct w83l785ts_data *data;
	214	int err = 0;
	215
	216	data = kzalloc(sizeof(struct w83l785ts_data), GFP_KERNEL);
	217	if (!data) {
	218	err = -ENOMEM;
	219	goto exit;
	220	}
	221
	222	i2c_set_clientdata(new_client, data);
1da177e4	223	data->valid = 0;
9a61bf63	224	mutex_init(&data->update_lock);
1da177e4 LT	225
1da177e4 LT	226	/* Default values in case the first read fails (unlikely). */
709439a2	227	data->temp[1] = data->temp[0] = 0;
1da177e4	228
1da177e4 LT	229	/*
	230	* Initialize the W83L785TS chip
	231	* Nothing yet, assume it is already started.
	232	*/
	233
ccc5c306 RM	234	err = device_create_file(&new_client->dev,
	235	&sensor_dev_attr_temp1_input.dev_attr);
	236	if (err)
	237	goto exit_remove;
	238
	239	err = device_create_file(&new_client->dev,
	240	&sensor_dev_attr_temp1_max.dev_attr);
	241	if (err)
	242	goto exit_remove;
	243
1da177e4	244	/* Register sysfs hooks */
1beeffe4 TJ	245	data->hwmon_dev = hwmon_device_register(&new_client->dev);
	246	if (IS_ERR(data->hwmon_dev)) {
	247	err = PTR_ERR(data->hwmon_dev);
ccc5c306	248	goto exit_remove;
943b0830 MH	249	}
943b0830 MH	250
1da177e4 LT	251	return 0;
1da177e4 LT	252
ccc5c306 RM	253	exit_remove:
	254	device_remove_file(&new_client->dev,
	255	&sensor_dev_attr_temp1_input.dev_attr);
	256	device_remove_file(&new_client->dev,
	257	&sensor_dev_attr_temp1_max.dev_attr);
1da177e4 LT	258	kfree(data);
	259	exit:
	260	return err;
	261	}
	262
dc18a418	263	static int w83l785ts_remove(struct i2c_client *client)
1da177e4	264	{
943b0830	265	struct w83l785ts_data *data = i2c_get_clientdata(client);
1da177e4	266
1beeffe4	267	hwmon_device_unregister(data->hwmon_dev);
ccc5c306 RM	268	device_remove_file(&client->dev,
	269	&sensor_dev_attr_temp1_input.dev_attr);
	270	device_remove_file(&client->dev,
	271	&sensor_dev_attr_temp1_max.dev_attr);
1da177e4	272
943b0830	273	kfree(data);
1da177e4 LT	274	return 0;
	275	}
	276
	277	static u8 w83l785ts_read_value(struct i2c_client *client, u8 reg, u8 defval)
	278	{
	279	int value, i;
dc18a418 JD	280	struct device *dev;
	281	const char *prefix;
	282
	283	/* We might be called during detection, at which point the client
	284	isn't yet fully initialized, so we can't use dev_dbg on it */
	285	if (i2c_get_clientdata(client)) {
	286	dev = &client->dev;
	287	prefix = "";
	288	} else {
	289	dev = &client->adapter->dev;
	290	prefix = "w83l785ts: ";
	291	}
1da177e4 LT	292
	293	/* Frequent read errors have been reported on Asus boards, so we
	294	* retry on read errors. If it still fails (unlikely), return the
	295	* default value requested by the caller. */
	296	for (i = 1; i <= MAX_RETRIES; i++) {
	297	value = i2c_smbus_read_byte_data(client, reg);
	298	if (value >= 0) {
dc18a418 JD	299	dev_dbg(dev, "%sRead 0x%02x from register 0x%02x.\n",
dc18a418 JD	300	prefix, value, reg);
1da177e4 LT	301	return value;
1da177e4 LT	302	}
dc18a418	303	dev_dbg(dev, "%sRead failed, will retry in %d.\n", prefix, i);
1da177e4 LT	304	msleep(i);
	305	}
	306
dc18a418	307	dev_err(dev, "%sCouldn't read value from register 0x%02x.\n", prefix,
4040c415	308	reg);
1da177e4 LT	309	return defval;
	310	}
	311
	312	static struct w83l785ts_data w83l785ts_update_device(struct device dev)
	313	{
	314	struct i2c_client *client = to_i2c_client(dev);
	315	struct w83l785ts_data *data = i2c_get_clientdata(client);
	316
9a61bf63	317	mutex_lock(&data->update_lock);
1da177e4 LT	318
	319	if (!data->valid \|\| time_after(jiffies, data->last_updated + HZ * 2)) {
	320	dev_dbg(&client->dev, "Updating w83l785ts data.\n");
709439a2 JD	321	data->temp[0] = w83l785ts_read_value(client,
	322	W83L785TS_REG_TEMP, data->temp[0]);
	323	data->temp[1] = w83l785ts_read_value(client,
	324	W83L785TS_REG_TEMP_OVER, data->temp[1]);
1da177e4 LT	325
	326	data->last_updated = jiffies;
	327	data->valid = 1;
	328	}
	329
9a61bf63	330	mutex_unlock(&data->update_lock);
1da177e4 LT	331
	332	return data;
	333	}
	334
	335	static int __init sensors_w83l785ts_init(void)
	336	{
	337	return i2c_add_driver(&w83l785ts_driver);
	338	}
	339
	340	static void __exit sensors_w83l785ts_exit(void)
	341	{
	342	i2c_del_driver(&w83l785ts_driver);
	343	}
	344
	345	MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
	346	MODULE_DESCRIPTION("W83L785TS-S driver");
	347	MODULE_LICENSE("GPL");
	348
	349	module_init(sensors_w83l785ts_init);
	350	module_exit(sensors_w83l785ts_exit);