[linux-2.6-block.git] / drivers / hwmon / lm75.c

/*
    lm75.c - Part of lm_sensors, Linux kernel modules for hardware
             monitoring
    Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl>

    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.
 * Only types which are _not_ listed in I2C_CLIENT_INSMOD_*() need to be
 * listed here.  We start at 9 since I2C_CLIENT_INSMOD_*() currently allow
 * definition of up to 8 chip types (plus zero).
 */

enum lm75_type {		/* keep sorted in alphabetical order */
	ds1775 = 9,
	ds75,
	/* lm75 -- in I2C_CLIENT_INSMOD_1() */
	lm75a,
	max6625,
	max6626,
	mcp980x,
	stds75,
	tcn75,
	tmp100,
	tmp101,
	tmp175,
	tmp275,
	tmp75,
};

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

/* Insmod parameters */
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 device		*hwmon_dev;
	struct mutex		update_lock;
	u8			orig_conf;
	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 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,
};

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

/* device probe and removal */

static int
lm75_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
	struct lm75_data *data;
	int status;
	u8 set_mask, clr_mask;
	int new;

	if (!i2c_check_functionality(client->adapter,
			I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
		return -EIO;

	data = kzalloc(sizeof(struct lm75_data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

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

	/* Set to LM75 resolution (9 bits, 1/2 degree C) and range.
	 * Then tweak to be more precise when appropriate.
	 */
	set_mask = 0;
	clr_mask = (1 << 0)			/* continuous conversions */
		| (1 << 6) | (1 << 5);		/* 9-bit mode */

	/* configure as specified */
	status = lm75_read_value(client, LM75_REG_CONF);
	if (status < 0) {
		dev_dbg(&client->dev, "Can't read config? %d\n", status);
		goto exit_free;
	}
	data->orig_conf = status;
	new = status & ~clr_mask;
	new |= set_mask;
	if (status != new)
		lm75_write_value(client, LM75_REG_CONF, new);
	dev_dbg(&client->dev, "Config %02x\n", new);

	/* Register sysfs hooks */
	status = sysfs_create_group(&client->dev.kobj, &lm75_group);
	if (status)
		goto exit_free;

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

	dev_info(&client->dev, "%s: sensor '%s'\n",
		 dev_name(data->hwmon_dev), client->name);

	return 0;

exit_remove:
	sysfs_remove_group(&client->dev.kobj, &lm75_group);
exit_free:
	i2c_set_clientdata(client, NULL);
	kfree(data);
	return status;
}

static int lm75_remove(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);
	lm75_write_value(client, LM75_REG_CONF, data->orig_conf);
	i2c_set_clientdata(client, NULL);
	kfree(data);
	return 0;
}

static const struct i2c_device_id lm75_ids[] = {
	{ "ds1775", ds1775, },
	{ "ds75", ds75, },
	{ "lm75", lm75, },
	{ "lm75a", lm75a, },
	{ "max6625", max6625, },
	{ "max6626", max6626, },
	{ "mcp980x", mcp980x, },
	{ "stds75", stds75, },
	{ "tcn75", tcn75, },
	{ "tmp100", tmp100, },
	{ "tmp101", tmp101, },
	{ "tmp175", tmp175, },
	{ "tmp275", tmp275, },
	{ "tmp75", tmp75, },
	{ /* LIST END */ }
};
MODULE_DEVICE_TABLE(i2c, lm75_ids);

/* Return 0 if detection is successful, -ENODEV otherwise */
static int lm75_detect(struct i2c_client *new_client, int kind,
		       struct i2c_board_info *info)
{
	struct i2c_adapter *adapter = new_client->adapter;
	int i;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
				     I2C_FUNC_SMBUS_WORD_DATA))
		return -ENODEV;

	/* 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)
			return -ENODEV;
		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)
			return -ENODEV;

		/* Unused bits */
		if (conf & 0xe0)
			return -ENODEV;

		/* 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)
				return -ENODEV;
	}

	/* NOTE: we treat "force=..." and "force_lm75=..." the same.
	 * Only new-style driver binding distinguishes chip types.
	 */
	strlcpy(info->type, "lm75", I2C_NAME_SIZE);

	return 0;
}

static struct i2c_driver lm75_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "lm75",
	},
	.probe		= lm75_probe,
	.remove		= lm75_remove,
	.id_table	= lm75_ids,
	.detect		= lm75_detect,
	.address_data	= &addr_data,
};

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

/* 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 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 <frodol@dds.nl>");
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 <frodol@dds.nl>
	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	/*
01a52397 DB	34	* This driver handles the LM75 and compatible digital temperature sensors.
9ebd3d82 DB	35	* Only types which are _not_ listed in I2C_CLIENT_INSMOD_*() need to be
	36	* listed here. We start at 9 since I2C_CLIENT_INSMOD_*() currently allow
	37	* definition of up to 8 chip types (plus zero).
01a52397 DB	38	*/
01a52397 DB	39
9ebd3d82 DB	40	enum lm75_type { /* keep sorted in alphabetical order */
	41	ds1775 = 9,
	42	ds75,
	43	/* lm75 -- in I2C_CLIENT_INSMOD_1() */
	44	lm75a,
	45	max6625,
	46	max6626,
	47	mcp980x,
	48	stds75,
	49	tcn75,
	50	tmp100,
	51	tmp101,
	52	tmp175,
	53	tmp275,
	54	tmp75,
	55	};
	56
8ff69eeb	57	/* Addresses scanned */
25e9c86d	58	static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
1da177e4	59	0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
1da177e4	60
8ff69eeb	61	/* Insmod parameters */
f4b50261	62	I2C_CLIENT_INSMOD_1(lm75);
1da177e4	63
1da177e4 LT	64
1da177e4 LT	65	/* The LM75 registers */
1da177e4	66	#define LM75_REG_CONF 0x01
9ca8e40c JD	67	static const u8 LM75_REG_TEMP[3] = {
	68	0x00, /* input */
	69	0x03, /* max */
	70	0x02, /* hyst */
	71	};
1da177e4 LT	72
	73	/* Each client has this additional data */
	74	struct lm75_data {
01a52397	75	struct device *hwmon_dev;
9a61bf63	76	struct mutex update_lock;
9ebd3d82	77	u8 orig_conf;
01a52397	78	char valid; /* !=0 if registers are valid */
1da177e4	79	unsigned long last_updated; /* In jiffies */
9ca8e40c JD	80	u16 temp[3]; /* Register values,
	81	0 = input
	82	1 = max
	83	2 = hyst */
1da177e4 LT	84	};
1da177e4 LT	85
1da177e4 LT	86	static int lm75_read_value(struct i2c_client *client, u8 reg);
	87	static int lm75_write_value(struct i2c_client *client, u8 reg, u16 value);
	88	static struct lm75_data lm75_update_device(struct device dev);
	89
	90
01a52397 DB	91	/-----------------------------------------------------------------------/
	92
	93	/* sysfs attributes for hwmon */
1da177e4	94
9ca8e40c JD	95	static ssize_t show_temp(struct device dev, struct device_attribute da,
	96	char *buf)
	97	{
	98	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	99	struct lm75_data *data = lm75_update_device(dev);
	100	return sprintf(buf, "%d\n",
	101	LM75_TEMP_FROM_REG(data->temp[attr->index]));
1da177e4	102	}
9ca8e40c JD	103
	104	static ssize_t set_temp(struct device dev, struct device_attribute da,
	105	const char *buf, size_t count)
	106	{
	107	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	108	struct i2c_client *client = to_i2c_client(dev);
	109	struct lm75_data *data = i2c_get_clientdata(client);
	110	int nr = attr->index;
5bfedac0	111	long temp = simple_strtol(buf, NULL, 10);
9ca8e40c JD	112
	113	mutex_lock(&data->update_lock);
	114	data->temp[nr] = LM75_TEMP_TO_REG(temp);
	115	lm75_write_value(client, LM75_REG_TEMP[nr], data->temp[nr]);
	116	mutex_unlock(&data->update_lock);
	117	return count;
1da177e4	118	}
1da177e4	119
9ca8e40c JD	120	static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR \| S_IRUGO,
	121	show_temp, set_temp, 1);
	122	static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR \| S_IRUGO,
	123	show_temp, set_temp, 2);
	124	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
1da177e4	125
c1685f61	126	static struct attribute *lm75_attributes[] = {
9ca8e40c JD	127	&sensor_dev_attr_temp1_input.dev_attr.attr,
	128	&sensor_dev_attr_temp1_max.dev_attr.attr,
	129	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
c1685f61 MH	130
	131	NULL
	132	};
	133
	134	static const struct attribute_group lm75_group = {
	135	.attrs = lm75_attributes,
	136	};
	137
01a52397 DB	138	/-----------------------------------------------------------------------/
01a52397 DB	139
8ff69eeb	140	/* device probe and removal */
9ebd3d82 DB	141
	142	static int
	143	lm75_probe(struct i2c_client client, const struct i2c_device_id id)
	144	{
	145	struct lm75_data *data;
	146	int status;
	147	u8 set_mask, clr_mask;
	148	int new;
	149
	150	if (!i2c_check_functionality(client->adapter,
	151	I2C_FUNC_SMBUS_BYTE_DATA \| I2C_FUNC_SMBUS_WORD_DATA))
	152	return -EIO;
	153
	154	data = kzalloc(sizeof(struct lm75_data), GFP_KERNEL);
	155	if (!data)
	156	return -ENOMEM;
	157
	158	i2c_set_clientdata(client, data);
9ebd3d82 DB	159	mutex_init(&data->update_lock);
	160
	161	/* Set to LM75 resolution (9 bits, 1/2 degree C) and range.
	162	* Then tweak to be more precise when appropriate.
	163	*/
	164	set_mask = 0;
	165	clr_mask = (1 << 0) /* continuous conversions */
	166	\| (1 << 6) \| (1 << 5); /* 9-bit mode */
	167
	168	/* configure as specified */
	169	status = lm75_read_value(client, LM75_REG_CONF);
	170	if (status < 0) {
	171	dev_dbg(&client->dev, "Can't read config? %d\n", status);
	172	goto exit_free;
	173	}
	174	data->orig_conf = status;
	175	new = status & ~clr_mask;
	176	new \|= set_mask;
	177	if (status != new)
	178	lm75_write_value(client, LM75_REG_CONF, new);
	179	dev_dbg(&client->dev, "Config %02x\n", new);
	180
	181	/* Register sysfs hooks */
	182	status = sysfs_create_group(&client->dev.kobj, &lm75_group);
	183	if (status)
	184	goto exit_free;
	185
	186	data->hwmon_dev = hwmon_device_register(&client->dev);
	187	if (IS_ERR(data->hwmon_dev)) {
	188	status = PTR_ERR(data->hwmon_dev);
	189	goto exit_remove;
	190	}
	191
	192	dev_info(&client->dev, "%s: sensor '%s'\n",
739cf3a2	193	dev_name(data->hwmon_dev), client->name);
9ebd3d82 DB	194
	195	return 0;
	196
	197	exit_remove:
	198	sysfs_remove_group(&client->dev.kobj, &lm75_group);
	199	exit_free:
	200	i2c_set_clientdata(client, NULL);
	201	kfree(data);
	202	return status;
	203	}
	204
	205	static int lm75_remove(struct i2c_client *client)
	206	{
	207	struct lm75_data *data = i2c_get_clientdata(client);
	208
	209	hwmon_device_unregister(data->hwmon_dev);
	210	sysfs_remove_group(&client->dev.kobj, &lm75_group);
	211	lm75_write_value(client, LM75_REG_CONF, data->orig_conf);
	212	i2c_set_clientdata(client, NULL);
	213	kfree(data);
	214	return 0;
	215	}
	216
	217	static const struct i2c_device_id lm75_ids[] = {
	218	{ "ds1775", ds1775, },
	219	{ "ds75", ds75, },
	220	{ "lm75", lm75, },
	221	{ "lm75a", lm75a, },
	222	{ "max6625", max6625, },
	223	{ "max6626", max6626, },
	224	{ "mcp980x", mcp980x, },
	225	{ "stds75", stds75, },
	226	{ "tcn75", tcn75, },
	227	{ "tmp100", tmp100, },
	228	{ "tmp101", tmp101, },
	229	{ "tmp175", tmp175, },
	230	{ "tmp275", tmp275, },
	231	{ "tmp75", tmp75, },
	232	{ /* LIST END */ }
	233	};
	234	MODULE_DEVICE_TABLE(i2c, lm75_ids);
	235
8ff69eeb JD	236	/* Return 0 if detection is successful, -ENODEV otherwise */
	237	static int lm75_detect(struct i2c_client *new_client, int kind,
	238	struct i2c_board_info *info)
1da177e4	239	{
8ff69eeb	240	struct i2c_adapter *adapter = new_client->adapter;
1da177e4	241	int i;
1da177e4	242
1da177e4 LT	243	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA \|
1da177e4 LT	244	I2C_FUNC_SMBUS_WORD_DATA))
8ff69eeb	245	return -ENODEV;
1da177e4 LT	246
	247	/* Now, we do the remaining detection. There is no identification-
	248	dedicated register so we have to rely on several tricks:
	249	unused bits, registers cycling over 8-address boundaries,
	250	addresses 0x04-0x07 returning the last read value.
	251	The cycling+unused addresses combination is not tested,
	252	since it would significantly slow the detection down and would
	253	hardly add any value. */
	254	if (kind < 0) {
	255	int cur, conf, hyst, os;
	256
	257	/* Unused addresses */
	258	cur = i2c_smbus_read_word_data(new_client, 0);
	259	conf = i2c_smbus_read_byte_data(new_client, 1);
	260	hyst = i2c_smbus_read_word_data(new_client, 2);
	261	if (i2c_smbus_read_word_data(new_client, 4) != hyst
	262	\|\| i2c_smbus_read_word_data(new_client, 5) != hyst
	263	\|\| i2c_smbus_read_word_data(new_client, 6) != hyst
	264	\|\| i2c_smbus_read_word_data(new_client, 7) != hyst)
8ff69eeb	265	return -ENODEV;
1da177e4 LT	266	os = i2c_smbus_read_word_data(new_client, 3);
	267	if (i2c_smbus_read_word_data(new_client, 4) != os
	268	\|\| i2c_smbus_read_word_data(new_client, 5) != os
	269	\|\| i2c_smbus_read_word_data(new_client, 6) != os
	270	\|\| i2c_smbus_read_word_data(new_client, 7) != os)
8ff69eeb	271	return -ENODEV;
1da177e4 LT	272
	273	/* Unused bits */
	274	if (conf & 0xe0)
8ff69eeb	275	return -ENODEV;
1da177e4 LT	276
	277	/* Addresses cycling */
	278	for (i = 8; i < 0xff; i += 8)
	279	if (i2c_smbus_read_byte_data(new_client, i + 1) != conf
	280	\|\| i2c_smbus_read_word_data(new_client, i + 2) != hyst
	281	\|\| i2c_smbus_read_word_data(new_client, i + 3) != os)
8ff69eeb	282	return -ENODEV;
1da177e4 LT	283	}
1da177e4 LT	284
9ebd3d82 DB	285	/* NOTE: we treat "force=..." and "force_lm75=..." the same.
	286	* Only new-style driver binding distinguishes chip types.
	287	*/
8ff69eeb	288	strlcpy(info->type, "lm75", I2C_NAME_SIZE);
c1685f61	289
1da177e4	290	return 0;
01a52397 DB	291	}
01a52397 DB	292
8ff69eeb JD	293	static struct i2c_driver lm75_driver = {
8ff69eeb JD	294	.class = I2C_CLASS_HWMON,
01a52397	295	.driver = {
8ff69eeb	296	.name = "lm75",
01a52397	297	},
8ff69eeb JD	298	.probe = lm75_probe,
	299	.remove = lm75_remove,
	300	.id_table = lm75_ids,
	301	.detect = lm75_detect,
	302	.address_data = &addr_data,
01a52397 DB	303	};
	304
	305	/-----------------------------------------------------------------------/
	306
	307	/* register access */
	308
1da177e4 LT	309	/* All registers are word-sized, except for the configuration register.
1da177e4 LT	310	LM75 uses a high-byte first convention, which is exactly opposite to
ccd6befc	311	the SMBus standard. */
1da177e4 LT	312	static int lm75_read_value(struct i2c_client *client, u8 reg)
1da177e4 LT	313	{
bcccc3a2 DB	314	int value;
bcccc3a2 DB	315
1da177e4 LT	316	if (reg == LM75_REG_CONF)
1da177e4 LT	317	return i2c_smbus_read_byte_data(client, reg);
bcccc3a2 DB	318
	319	value = i2c_smbus_read_word_data(client, reg);
	320	return (value < 0) ? value : swab16(value);
1da177e4 LT	321	}
1da177e4 LT	322
1da177e4 LT	323	static int lm75_write_value(struct i2c_client *client, u8 reg, u16 value)
	324	{
	325	if (reg == LM75_REG_CONF)
	326	return i2c_smbus_write_byte_data(client, reg, value);
	327	else
	328	return i2c_smbus_write_word_data(client, reg, swab16(value));
	329	}
	330
1da177e4 LT	331	static struct lm75_data lm75_update_device(struct device dev)
	332	{
	333	struct i2c_client *client = to_i2c_client(dev);
	334	struct lm75_data *data = i2c_get_clientdata(client);
	335
9a61bf63	336	mutex_lock(&data->update_lock);
1da177e4 LT	337
	338	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	339	\|\| !data->valid) {
9ca8e40c	340	int i;
1da177e4 LT	341	dev_dbg(&client->dev, "Starting lm75 update\n");
1da177e4 LT	342
bcccc3a2 DB	343	for (i = 0; i < ARRAY_SIZE(data->temp); i++) {
	344	int status;
	345
	346	status = lm75_read_value(client, LM75_REG_TEMP[i]);
	347	if (status < 0)
	348	dev_dbg(&client->dev, "reg %d, err %d\n",
	349	LM75_REG_TEMP[i], status);
	350	else
	351	data->temp[i] = status;
	352	}
1da177e4 LT	353	data->last_updated = jiffies;
	354	data->valid = 1;
	355	}
	356
9a61bf63	357	mutex_unlock(&data->update_lock);
1da177e4 LT	358
	359	return data;
	360	}
	361
01a52397 DB	362	/-----------------------------------------------------------------------/
	363
	364	/* module glue */
	365
1da177e4 LT	366	static int __init sensors_lm75_init(void)
1da177e4 LT	367	{
8ff69eeb	368	return i2c_add_driver(&lm75_driver);
1da177e4 LT	369	}
	370
	371	static void __exit sensors_lm75_exit(void)
	372	{
	373	i2c_del_driver(&lm75_driver);
	374	}
	375
	376	MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
	377	MODULE_DESCRIPTION("LM75 driver");
	378	MODULE_LICENSE("GPL");
	379
	380	module_init(sensors_lm75_init);
	381	module_exit(sensors_lm75_exit);