[linux.git] / drivers / hwmon / lm75.c

/*
    lm75.c - Part of lm_sensors, Linux kernel modules for hardware
             monitoring
    Copyright (c) 1998, 1999  Frodo Looijaard <[email protected]>

    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/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>
#include "lm75.h"


/*
 * This driver handles the LM75 and compatible digital temperature sensors.
 * Compatibles include at least the DS75, DS1775, MCP980x, STDS75, TCN75,
 * TMP100, TMP101, TMP75, TMP175, and TMP275.
 */

/* Addresses scanned by legacy style driver binding */
static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
					0x4d, 0x4e, 0x4f, I2C_CLIENT_END };

/* Insmod parameters (only for legacy style driver binding) */
I2C_CLIENT_INSMOD_1(lm75);


/* The LM75 registers */
#define LM75_REG_CONF		0x01
static const u8 LM75_REG_TEMP[3] = {
	0x00,		/* input */
	0x03,		/* max */
	0x02,		/* hyst */
};

/* Each client has this additional data */
struct lm75_data {
	struct i2c_client	client;
	struct device		*hwmon_dev;
	struct mutex		update_lock;
	char			valid;		/* !=0 if registers are valid */
	unsigned long		last_updated;	/* In jiffies */
	u16			temp[3];	/* Register values,
						   0 = input
						   1 = max
						   2 = hyst */
};

static void lm75_init_client(struct i2c_client *client);
static int lm75_read_value(struct i2c_client *client, u8 reg);
static int lm75_write_value(struct i2c_client *client, u8 reg, u16 value);
static struct lm75_data *lm75_update_device(struct device *dev);


/*-----------------------------------------------------------------------*/

/* sysfs attributes for hwmon */

static ssize_t show_temp(struct device *dev, struct device_attribute *da,
			 char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct lm75_data *data = lm75_update_device(dev);
	return sprintf(buf, "%d\n",
		       LM75_TEMP_FROM_REG(data->temp[attr->index]));
}

static ssize_t set_temp(struct device *dev, struct device_attribute *da,
			const char *buf, size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct i2c_client *client = to_i2c_client(dev);
	struct lm75_data *data = i2c_get_clientdata(client);
	int nr = attr->index;
	long temp = simple_strtol(buf, NULL, 10);

	mutex_lock(&data->update_lock);
	data->temp[nr] = LM75_TEMP_TO_REG(temp);
	lm75_write_value(client, LM75_REG_TEMP[nr], data->temp[nr]);
	mutex_unlock(&data->update_lock);
	return count;
}

static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
			show_temp, set_temp, 1);
static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
			show_temp, set_temp, 2);
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);

static struct attribute *lm75_attributes[] = {
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,

	NULL
};

static const struct attribute_group lm75_group = {
	.attrs = lm75_attributes,
};

/*-----------------------------------------------------------------------*/

/* "Legacy" I2C driver binding */

static struct i2c_driver lm75_driver;

/* This function is called by i2c_probe */
static int lm75_detect(struct i2c_adapter *adapter, int address, int kind)
{
	int i;
	struct i2c_client *new_client;
	struct lm75_data *data;
	int err = 0;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
				     I2C_FUNC_SMBUS_WORD_DATA))
		goto exit;

	/* OK. For now, we presume we have a valid address. We create the
	   client structure, even though there may be no sensor present.
	   But it allows us to use i2c_smbus_read_*_data() calls. */
	if (!(data = kzalloc(sizeof(struct lm75_data), GFP_KERNEL))) {
		err = -ENOMEM;
		goto exit;
	}

	new_client = &data->client;
	i2c_set_clientdata(new_client, data);
	new_client->addr = address;
	new_client->adapter = adapter;
	new_client->driver = &lm75_driver;
	new_client->flags = 0;

	/* Now, we do the remaining detection. There is no identification-
	   dedicated register so we have to rely on several tricks:
	   unused bits, registers cycling over 8-address boundaries,
	   addresses 0x04-0x07 returning the last read value.
	   The cycling+unused addresses combination is not tested,
	   since it would significantly slow the detection down and would
	   hardly add any value. */
	if (kind < 0) {
		int cur, conf, hyst, os;

		/* Unused addresses */
		cur = i2c_smbus_read_word_data(new_client, 0);
		conf = i2c_smbus_read_byte_data(new_client, 1);
		hyst = i2c_smbus_read_word_data(new_client, 2);
		if (i2c_smbus_read_word_data(new_client, 4) != hyst
		 || i2c_smbus_read_word_data(new_client, 5) != hyst
		 || i2c_smbus_read_word_data(new_client, 6) != hyst
		 || i2c_smbus_read_word_data(new_client, 7) != hyst)
			goto exit_free;
		os = i2c_smbus_read_word_data(new_client, 3);
		if (i2c_smbus_read_word_data(new_client, 4) != os
		 || i2c_smbus_read_word_data(new_client, 5) != os
		 || i2c_smbus_read_word_data(new_client, 6) != os
		 || i2c_smbus_read_word_data(new_client, 7) != os)
			goto exit_free;

		/* Unused bits */
		if (conf & 0xe0)
			goto exit_free;

		/* Addresses cycling */
		for (i = 8; i < 0xff; i += 8)
			if (i2c_smbus_read_byte_data(new_client, i + 1) != conf
			 || i2c_smbus_read_word_data(new_client, i + 2) != hyst
			 || i2c_smbus_read_word_data(new_client, i + 3) != os)
				goto exit_free;
	}

	/* NOTE: we treat "force=..." and "force_lm75=..." the same. */
	strlcpy(new_client->name, "lm75", I2C_NAME_SIZE);

	/* Fill in the remaining client fields and put it into the global list */
	data->valid = 0;
	mutex_init(&data->update_lock);

	/* Tell the I2C layer a new client has arrived */
	if ((err = i2c_attach_client(new_client)))
		goto exit_free;

	/* Initialize the LM75 chip */
	lm75_init_client(new_client);

	/* Register sysfs hooks */
	if ((err = sysfs_create_group(&new_client->dev.kobj, &lm75_group)))
		goto exit_detach;

	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:
	sysfs_remove_group(&new_client->dev.kobj, &lm75_group);
exit_detach:
	i2c_detach_client(new_client);
exit_free:
	kfree(data);
exit:
	return err;
}

static int lm75_attach_adapter(struct i2c_adapter *adapter)
{
	if (!(adapter->class & I2C_CLASS_HWMON))
		return 0;
	return i2c_probe(adapter, &addr_data, lm75_detect);
}

static int lm75_detach_client(struct i2c_client *client)
{
	struct lm75_data *data = i2c_get_clientdata(client);
	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&client->dev.kobj, &lm75_group);
	i2c_detach_client(client);
	kfree(data);
	return 0;
}

static struct i2c_driver lm75_driver = {
	.driver = {
		.name	= "lm75",
	},
	.attach_adapter	= lm75_attach_adapter,
	.detach_client	= lm75_detach_client,
};

/*-----------------------------------------------------------------------*/

/* register access */

/* All registers are word-sized, except for the configuration register.
   LM75 uses a high-byte first convention, which is exactly opposite to
   the SMBus standard. */
static int lm75_read_value(struct i2c_client *client, u8 reg)
{
	int value;

	if (reg == LM75_REG_CONF)
		return i2c_smbus_read_byte_data(client, reg);

	value = i2c_smbus_read_word_data(client, reg);
	return (value < 0) ? value : swab16(value);
}

static int lm75_write_value(struct i2c_client *client, u8 reg, u16 value)
{
	if (reg == LM75_REG_CONF)
		return i2c_smbus_write_byte_data(client, reg, value);
	else
		return i2c_smbus_write_word_data(client, reg, swab16(value));
}

static void lm75_init_client(struct i2c_client *client)
{
	int reg;

	/* Enable if in shutdown mode */
	reg = lm75_read_value(client, LM75_REG_CONF);
	if (reg >= 0 && (reg & 0x01))
		lm75_write_value(client, LM75_REG_CONF, reg & 0xfe);
}

static struct lm75_data *lm75_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm75_data *data = i2c_get_clientdata(client);

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	    || !data->valid) {
		int i;
		dev_dbg(&client->dev, "Starting lm75 update\n");

		for (i = 0; i < ARRAY_SIZE(data->temp); i++) {
			int status;

			status = lm75_read_value(client, LM75_REG_TEMP[i]);
			if (status < 0)
				dev_dbg(&client->dev, "reg %d, err %d\n",
						LM75_REG_TEMP[i], status);
			else
				data->temp[i] = status;
		}
		data->last_updated = jiffies;
		data->valid = 1;
	}

	mutex_unlock(&data->update_lock);

	return data;
}

/*-----------------------------------------------------------------------*/

/* module glue */

static int __init sensors_lm75_init(void)
{
	return i2c_add_driver(&lm75_driver);
}

static void __exit sensors_lm75_exit(void)
{
	i2c_del_driver(&lm75_driver);
}

MODULE_AUTHOR("Frodo Looijaard <[email protected]>");
MODULE_DESCRIPTION("LM75 driver");
MODULE_LICENSE("GPL");

module_init(sensors_lm75_init);
module_exit(sensors_lm75_exit);
Commit	Line	Data
1da177e4 LT	1	/*
	2	lm75.c - Part of lm_sensors, Linux kernel modules for hardware
	3	monitoring
	4	Copyright (c) 1998, 1999 Frodo Looijaard <[email protected]>
	5
	6	This program is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 2 of the License, or
	9	(at your option) any later version.
	10
	11	This program is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
	17	along with this program; if not, write to the Free Software
	18	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	19	*/
	20
1da177e4 LT	21	#include <linux/module.h>
	22	#include <linux/init.h>
	23	#include <linux/slab.h>
	24	#include <linux/jiffies.h>
	25	#include <linux/i2c.h>
943b0830	26	#include <linux/hwmon.h>
9ca8e40c	27	#include <linux/hwmon-sysfs.h>
943b0830	28	#include <linux/err.h>
9a61bf63	29	#include <linux/mutex.h>
1da177e4 LT	30	#include "lm75.h"
	31
	32
01a52397 DB	33	/*
	34	* This driver handles the LM75 and compatible digital temperature sensors.
	35	* Compatibles include at least the DS75, DS1775, MCP980x, STDS75, TCN75,
	36	* TMP100, TMP101, TMP75, TMP175, and TMP275.
	37	*/
	38
	39	/* Addresses scanned by legacy style driver binding */
25e9c86d	40	static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
1da177e4	41	0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
1da177e4	42
01a52397	43	/* Insmod parameters (only for legacy style driver binding) */
f4b50261	44	I2C_CLIENT_INSMOD_1(lm75);
1da177e4	45
1da177e4 LT	46
1da177e4 LT	47	/* The LM75 registers */
1da177e4	48	#define LM75_REG_CONF 0x01
9ca8e40c JD	49	static const u8 LM75_REG_TEMP[3] = {
	50	0x00, /* input */
	51	0x03, /* max */
	52	0x02, /* hyst */
	53	};
1da177e4 LT	54
	55	/* Each client has this additional data */
	56	struct lm75_data {
	57	struct i2c_client client;
01a52397	58	struct device *hwmon_dev;
9a61bf63	59	struct mutex update_lock;
01a52397	60	char valid; /* !=0 if registers are valid */
1da177e4	61	unsigned long last_updated; /* In jiffies */
9ca8e40c JD	62	u16 temp[3]; /* Register values,
	63	0 = input
	64	1 = max
	65	2 = hyst */
1da177e4 LT	66	};
1da177e4 LT	67
1da177e4	68	static void lm75_init_client(struct i2c_client *client);
1da177e4 LT	69	static int lm75_read_value(struct i2c_client *client, u8 reg);
	70	static int lm75_write_value(struct i2c_client *client, u8 reg, u16 value);
	71	static struct lm75_data lm75_update_device(struct device dev);
	72
	73
01a52397 DB	74	/-----------------------------------------------------------------------/
	75
	76	/* sysfs attributes for hwmon */
1da177e4	77
9ca8e40c JD	78	static ssize_t show_temp(struct device dev, struct device_attribute da,
	79	char *buf)
	80	{
	81	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	82	struct lm75_data *data = lm75_update_device(dev);
	83	return sprintf(buf, "%d\n",
	84	LM75_TEMP_FROM_REG(data->temp[attr->index]));
1da177e4	85	}
9ca8e40c JD	86
	87	static ssize_t set_temp(struct device dev, struct device_attribute da,
	88	const char *buf, size_t count)
	89	{
	90	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	91	struct i2c_client *client = to_i2c_client(dev);
	92	struct lm75_data *data = i2c_get_clientdata(client);
	93	int nr = attr->index;
5bfedac0	94	long temp = simple_strtol(buf, NULL, 10);
9ca8e40c JD	95
	96	mutex_lock(&data->update_lock);
	97	data->temp[nr] = LM75_TEMP_TO_REG(temp);
	98	lm75_write_value(client, LM75_REG_TEMP[nr], data->temp[nr]);
	99	mutex_unlock(&data->update_lock);
	100	return count;
1da177e4	101	}
1da177e4	102
9ca8e40c JD	103	static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR \| S_IRUGO,
	104	show_temp, set_temp, 1);
	105	static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR \| S_IRUGO,
	106	show_temp, set_temp, 2);
	107	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
1da177e4	108
c1685f61	109	static struct attribute *lm75_attributes[] = {
9ca8e40c JD	110	&sensor_dev_attr_temp1_input.dev_attr.attr,
	111	&sensor_dev_attr_temp1_max.dev_attr.attr,
	112	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
c1685f61 MH	113
	114	NULL
	115	};
	116
	117	static const struct attribute_group lm75_group = {
	118	.attrs = lm75_attributes,
	119	};
	120
01a52397 DB	121	/-----------------------------------------------------------------------/
	122
	123	/* "Legacy" I2C driver binding */
	124
	125	static struct i2c_driver lm75_driver;
	126
2ed2dc3c	127	/* This function is called by i2c_probe */
1da177e4 LT	128	static int lm75_detect(struct i2c_adapter *adapter, int address, int kind)
	129	{
	130	int i;
	131	struct i2c_client *new_client;
	132	struct lm75_data *data;
	133	int err = 0;
1da177e4	134
1da177e4 LT	135	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA \|
	136	I2C_FUNC_SMBUS_WORD_DATA))
	137	goto exit;
	138
01a52397 DB	139	/* OK. For now, we presume we have a valid address. We create the
	140	client structure, even though there may be no sensor present.
	141	But it allows us to use i2c_smbus_read__data() calls. /
ba9c2e8d	142	if (!(data = kzalloc(sizeof(struct lm75_data), GFP_KERNEL))) {
1da177e4 LT	143	err = -ENOMEM;
	144	goto exit;
	145	}
1da177e4 LT	146
	147	new_client = &data->client;
	148	i2c_set_clientdata(new_client, data);
	149	new_client->addr = address;
	150	new_client->adapter = adapter;
	151	new_client->driver = &lm75_driver;
	152	new_client->flags = 0;
	153
	154	/* Now, we do the remaining detection. There is no identification-
	155	dedicated register so we have to rely on several tricks:
	156	unused bits, registers cycling over 8-address boundaries,
	157	addresses 0x04-0x07 returning the last read value.
	158	The cycling+unused addresses combination is not tested,
	159	since it would significantly slow the detection down and would
	160	hardly add any value. */
	161	if (kind < 0) {
	162	int cur, conf, hyst, os;
	163
	164	/* Unused addresses */
	165	cur = i2c_smbus_read_word_data(new_client, 0);
	166	conf = i2c_smbus_read_byte_data(new_client, 1);
	167	hyst = i2c_smbus_read_word_data(new_client, 2);
	168	if (i2c_smbus_read_word_data(new_client, 4) != hyst
	169	\|\| i2c_smbus_read_word_data(new_client, 5) != hyst
	170	\|\| i2c_smbus_read_word_data(new_client, 6) != hyst
	171	\|\| i2c_smbus_read_word_data(new_client, 7) != hyst)
01a52397	172	goto exit_free;
1da177e4 LT	173	os = i2c_smbus_read_word_data(new_client, 3);
	174	if (i2c_smbus_read_word_data(new_client, 4) != os
	175	\|\| i2c_smbus_read_word_data(new_client, 5) != os
	176	\|\| i2c_smbus_read_word_data(new_client, 6) != os
	177	\|\| i2c_smbus_read_word_data(new_client, 7) != os)
01a52397	178	goto exit_free;
1da177e4 LT	179
	180	/* Unused bits */
	181	if (conf & 0xe0)
01a52397	182	goto exit_free;
1da177e4 LT	183
	184	/* Addresses cycling */
	185	for (i = 8; i < 0xff; i += 8)
	186	if (i2c_smbus_read_byte_data(new_client, i + 1) != conf
	187	\|\| i2c_smbus_read_word_data(new_client, i + 2) != hyst
	188	\|\| i2c_smbus_read_word_data(new_client, i + 3) != os)
	189	goto exit_free;
	190	}
	191
01a52397 DB	192	/* NOTE: we treat "force=..." and "force_lm75=..." the same. */
01a52397 DB	193	strlcpy(new_client->name, "lm75", I2C_NAME_SIZE);
1da177e4 LT	194
1da177e4 LT	195	/* Fill in the remaining client fields and put it into the global list */
1da177e4	196	data->valid = 0;
9a61bf63	197	mutex_init(&data->update_lock);
1da177e4 LT	198
	199	/* Tell the I2C layer a new client has arrived */
	200	if ((err = i2c_attach_client(new_client)))
	201	goto exit_free;
	202
	203	/* Initialize the LM75 chip */
	204	lm75_init_client(new_client);
01a52397	205
1da177e4	206	/* Register sysfs hooks */
c1685f61 MH	207	if ((err = sysfs_create_group(&new_client->dev.kobj, &lm75_group)))
	208	goto exit_detach;
	209
1beeffe4 TJ	210	data->hwmon_dev = hwmon_device_register(&new_client->dev);
	211	if (IS_ERR(data->hwmon_dev)) {
	212	err = PTR_ERR(data->hwmon_dev);
c1685f61	213	goto exit_remove;
943b0830 MH	214	}
943b0830 MH	215
1da177e4 LT	216	return 0;
1da177e4 LT	217
c1685f61 MH	218	exit_remove:
c1685f61 MH	219	sysfs_remove_group(&new_client->dev.kobj, &lm75_group);
943b0830 MH	220	exit_detach:
943b0830 MH	221	i2c_detach_client(new_client);
1da177e4 LT	222	exit_free:
	223	kfree(data);
	224	exit:
	225	return err;
	226	}
	227
01a52397 DB	228	static int lm75_attach_adapter(struct i2c_adapter *adapter)
	229	{
	230	if (!(adapter->class & I2C_CLASS_HWMON))
	231	return 0;
	232	return i2c_probe(adapter, &addr_data, lm75_detect);
	233	}
	234
1da177e4 LT	235	static int lm75_detach_client(struct i2c_client *client)
1da177e4 LT	236	{
943b0830	237	struct lm75_data *data = i2c_get_clientdata(client);
1beeffe4	238	hwmon_device_unregister(data->hwmon_dev);
c1685f61	239	sysfs_remove_group(&client->dev.kobj, &lm75_group);
1da177e4	240	i2c_detach_client(client);
943b0830	241	kfree(data);
1da177e4 LT	242	return 0;
	243	}
	244
01a52397 DB	245	static struct i2c_driver lm75_driver = {
	246	.driver = {
	247	.name = "lm75",
	248	},
	249	.attach_adapter = lm75_attach_adapter,
	250	.detach_client = lm75_detach_client,
	251	};
	252
	253	/-----------------------------------------------------------------------/
	254
	255	/* register access */
	256
1da177e4 LT	257	/* All registers are word-sized, except for the configuration register.
1da177e4 LT	258	LM75 uses a high-byte first convention, which is exactly opposite to
ccd6befc	259	the SMBus standard. */
1da177e4 LT	260	static int lm75_read_value(struct i2c_client *client, u8 reg)
1da177e4 LT	261	{
bcccc3a2 DB	262	int value;
bcccc3a2 DB	263
1da177e4 LT	264	if (reg == LM75_REG_CONF)
1da177e4 LT	265	return i2c_smbus_read_byte_data(client, reg);
bcccc3a2 DB	266
	267	value = i2c_smbus_read_word_data(client, reg);
	268	return (value < 0) ? value : swab16(value);
1da177e4 LT	269	}
1da177e4 LT	270
1da177e4 LT	271	static int lm75_write_value(struct i2c_client *client, u8 reg, u16 value)
	272	{
	273	if (reg == LM75_REG_CONF)
	274	return i2c_smbus_write_byte_data(client, reg, value);
	275	else
	276	return i2c_smbus_write_word_data(client, reg, swab16(value));
	277	}
	278
	279	static void lm75_init_client(struct i2c_client *client)
	280	{
e647ecf1 JD	281	int reg;
	282
	283	/* Enable if in shutdown mode */
	284	reg = lm75_read_value(client, LM75_REG_CONF);
	285	if (reg >= 0 && (reg & 0x01))
	286	lm75_write_value(client, LM75_REG_CONF, reg & 0xfe);
1da177e4 LT	287	}
	288
	289	static struct lm75_data lm75_update_device(struct device dev)
	290	{
	291	struct i2c_client *client = to_i2c_client(dev);
	292	struct lm75_data *data = i2c_get_clientdata(client);
	293
9a61bf63	294	mutex_lock(&data->update_lock);
1da177e4 LT	295
	296	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	297	\|\| !data->valid) {
9ca8e40c	298	int i;
1da177e4 LT	299	dev_dbg(&client->dev, "Starting lm75 update\n");
1da177e4 LT	300
bcccc3a2 DB	301	for (i = 0; i < ARRAY_SIZE(data->temp); i++) {
	302	int status;
	303
	304	status = lm75_read_value(client, LM75_REG_TEMP[i]);
	305	if (status < 0)
	306	dev_dbg(&client->dev, "reg %d, err %d\n",
	307	LM75_REG_TEMP[i], status);
	308	else
	309	data->temp[i] = status;
	310	}
1da177e4 LT	311	data->last_updated = jiffies;
	312	data->valid = 1;
	313	}
	314
9a61bf63	315	mutex_unlock(&data->update_lock);
1da177e4 LT	316
	317	return data;
	318	}
	319
01a52397 DB	320	/-----------------------------------------------------------------------/
	321
	322	/* module glue */
	323
1da177e4 LT	324	static int __init sensors_lm75_init(void)
	325	{
	326	return i2c_add_driver(&lm75_driver);
	327	}
	328
	329	static void __exit sensors_lm75_exit(void)
	330	{
	331	i2c_del_driver(&lm75_driver);
	332	}
	333
	334	MODULE_AUTHOR("Frodo Looijaard <[email protected]>");
	335	MODULE_DESCRIPTION("LM75 driver");
	336	MODULE_LICENSE("GPL");
	337
	338	module_init(sensors_lm75_init);
	339	module_exit(sensors_lm75_exit);