[linux-2.6-block.git] / drivers / hwmon / lm92.c

/*
 * lm92 - Hardware monitoring driver
 * Copyright (C) 2005-2008  Jean Delvare <jdelvare@suse.de>
 *
 * Based on the lm90 driver, with some ideas taken from the lm_sensors
 * lm92 driver as well.
 *
 * The LM92 is a sensor chip made by National Semiconductor. It reports
 * its own temperature with a 0.0625 deg resolution and a 0.33 deg
 * accuracy. Complete datasheet can be obtained from National's website
 * at:
 *   http://www.national.com/pf/LM/LM92.html
 *
 * This driver also supports the MAX6635 sensor chip made by Maxim.
 * This chip is compatible with the LM92, but has a lesser accuracy
 * (1.0 deg). Complete datasheet can be obtained from Maxim's website
 * at:
 *   http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3074
 *
 * Since the LM92 was the first chipset supported by this driver, most
 * comments will refer to this chipset, but are actually general and
 * concern all supported chipsets, unless mentioned otherwise.
 *
 * Support could easily be added for the National Semiconductor LM76
 * and Maxim MAX6633 and MAX6634 chips, which are mostly compatible
 * with the LM92.
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/jiffies.h>

/*
 * The LM92 and MAX6635 have 2 two-state pins for address selection,
 * resulting in 4 possible addresses.
 */
static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b,
						I2C_CLIENT_END };
enum chips { lm92, max6635 };

/* The LM92 registers */
#define LM92_REG_CONFIG			0x01 /* 8-bit, RW */
#define LM92_REG_TEMP			0x00 /* 16-bit, RO */
#define LM92_REG_TEMP_HYST		0x02 /* 16-bit, RW */
#define LM92_REG_TEMP_CRIT		0x03 /* 16-bit, RW */
#define LM92_REG_TEMP_LOW		0x04 /* 16-bit, RW */
#define LM92_REG_TEMP_HIGH		0x05 /* 16-bit, RW */
#define LM92_REG_MAN_ID			0x07 /* 16-bit, RO, LM92 only */

/*
 * The LM92 uses signed 13-bit values with LSB = 0.0625 degree Celsius,
 * left-justified in 16-bit registers. No rounding is done, with such
 * a resolution it's just not worth it. Note that the MAX6635 doesn't
 * make use of the 4 lower bits for limits (i.e. effective resolution
 * for limits is 1 degree Celsius).
 */
static inline int TEMP_FROM_REG(s16 reg)
{
	return reg / 8 * 625 / 10;
}

static inline s16 TEMP_TO_REG(long val)
{
	val = clamp_val(val, -60000, 160000);
	return val * 10 / 625 * 8;
}

/* Alarm flags are stored in the 3 LSB of the temperature register */
static inline u8 ALARMS_FROM_REG(s16 reg)
{
	return reg & 0x0007;
}

enum temp_index {
	t_input,
	t_crit,
	t_min,
	t_max,
	t_hyst,
	t_num_regs
};

static const u8 regs[t_num_regs] = {
	[t_input] = LM92_REG_TEMP,
	[t_crit] = LM92_REG_TEMP_CRIT,
	[t_min] = LM92_REG_TEMP_LOW,
	[t_max] = LM92_REG_TEMP_HIGH,
	[t_hyst] = LM92_REG_TEMP_HYST,
};

/* Client data (each client gets its own) */
struct lm92_data {
	struct i2c_client *client;
	struct mutex update_lock;
	char valid; /* zero until following fields are valid */
	unsigned long last_updated; /* in jiffies */

	/* registers values */
	s16 temp[t_num_regs];	/* index with enum temp_index */
};

/*
 * Sysfs attributes and callback functions
 */

static struct lm92_data *lm92_update_device(struct device *dev)
{
	struct lm92_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	int i;

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ) ||
	    !data->valid) {
		dev_dbg(&client->dev, "Updating lm92 data\n");
		for (i = 0; i < t_num_regs; i++) {
			data->temp[i] =
				i2c_smbus_read_word_swapped(client, regs[i]);
		}
		data->last_updated = jiffies;
		data->valid = 1;
	}

	mutex_unlock(&data->update_lock);

	return data;
}

static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
			 char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct lm92_data *data = lm92_update_device(dev);

	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
}

static ssize_t temp_store(struct device *dev,
			  struct device_attribute *devattr, const char *buf,
			  size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct lm92_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	int nr = attr->index;
	long val;
	int err;

	err = kstrtol(buf, 10, &val);
	if (err)
		return err;

	mutex_lock(&data->update_lock);
	data->temp[nr] = TEMP_TO_REG(val);
	i2c_smbus_write_word_swapped(client, regs[nr], data->temp[nr]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t temp_hyst_show(struct device *dev,
			      struct device_attribute *devattr, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct lm92_data *data = lm92_update_device(dev);

	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index])
		       - TEMP_FROM_REG(data->temp[t_hyst]));
}

static ssize_t temp1_min_hyst_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct lm92_data *data = lm92_update_device(dev);

	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[t_min])
		       + TEMP_FROM_REG(data->temp[t_hyst]));
}

static ssize_t temp_hyst_store(struct device *dev,
			       struct device_attribute *devattr,
			       const char *buf, size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct lm92_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	long val;
	int err;

	err = kstrtol(buf, 10, &val);
	if (err)
		return err;

	val = clamp_val(val, -120000, 220000);
	mutex_lock(&data->update_lock);
	data->temp[t_hyst] =
		TEMP_TO_REG(TEMP_FROM_REG(data->temp[attr->index]) - val);
	i2c_smbus_write_word_swapped(client, LM92_REG_TEMP_HYST,
				     data->temp[t_hyst]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t alarms_show(struct device *dev, struct device_attribute *attr,
			   char *buf)
{
	struct lm92_data *data = lm92_update_device(dev);

	return sprintf(buf, "%d\n", ALARMS_FROM_REG(data->temp[t_input]));
}

static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	int bitnr = to_sensor_dev_attr(attr)->index;
	struct lm92_data *data = lm92_update_device(dev);
	return sprintf(buf, "%d\n", (data->temp[t_input] >> bitnr) & 1);
}

static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, t_input);
static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp, t_crit);
static SENSOR_DEVICE_ATTR_RW(temp1_crit_hyst, temp_hyst, t_crit);
static SENSOR_DEVICE_ATTR_RW(temp1_min, temp, t_min);
static DEVICE_ATTR_RO(temp1_min_hyst);
static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, t_max);
static SENSOR_DEVICE_ATTR_RO(temp1_max_hyst, temp_hyst, t_max);
static DEVICE_ATTR_RO(alarms);
static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 2);
static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, alarm, 0);
static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 1);

/*
 * Detection and registration
 */

static void lm92_init_client(struct i2c_client *client)
{
	u8 config;

	/* Start the conversions if needed */
	config = i2c_smbus_read_byte_data(client, LM92_REG_CONFIG);
	if (config & 0x01)
		i2c_smbus_write_byte_data(client, LM92_REG_CONFIG,
					  config & 0xFE);
}

static struct attribute *lm92_attrs[] = {
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
	&sensor_dev_attr_temp1_min.dev_attr.attr,
	&dev_attr_temp1_min_hyst.attr,
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
	&dev_attr_alarms.attr,
	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	NULL
};
ATTRIBUTE_GROUPS(lm92);

/* Return 0 if detection is successful, -ENODEV otherwise */
static int lm92_detect(struct i2c_client *new_client,
		       struct i2c_board_info *info)
{
	struct i2c_adapter *adapter = new_client->adapter;
	u8 config;
	u16 man_id;

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

	config = i2c_smbus_read_byte_data(new_client, LM92_REG_CONFIG);
	man_id = i2c_smbus_read_word_data(new_client, LM92_REG_MAN_ID);

	if ((config & 0xe0) == 0x00 && man_id == 0x0180)
		pr_info("lm92: Found National Semiconductor LM92 chip\n");
	else
		return -ENODEV;

	strlcpy(info->type, "lm92", I2C_NAME_SIZE);

	return 0;
}

static int lm92_probe(struct i2c_client *new_client,
		      const struct i2c_device_id *id)
{
	struct device *hwmon_dev;
	struct lm92_data *data;

	data = devm_kzalloc(&new_client->dev, sizeof(struct lm92_data),
			    GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->client = new_client;
	mutex_init(&data->update_lock);

	/* Initialize the chipset */
	lm92_init_client(new_client);

	hwmon_dev = devm_hwmon_device_register_with_groups(&new_client->dev,
							   new_client->name,
							   data, lm92_groups);
	return PTR_ERR_OR_ZERO(hwmon_dev);
}

/*
 * Module and driver stuff
 */

static const struct i2c_device_id lm92_id[] = {
	{ "lm92", lm92 },
	{ "max6635", max6635 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, lm92_id);

static struct i2c_driver lm92_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "lm92",
	},
	.probe		= lm92_probe,
	.id_table	= lm92_id,
	.detect		= lm92_detect,
	.address_list	= normal_i2c,
};

module_i2c_driver(lm92_driver);

MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
MODULE_DESCRIPTION("LM92/MAX6635 driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
1da177e4 LT	2	* lm92 - Hardware monitoring driver
7c81c60f	3	* Copyright (C) 2005-2008 Jean Delvare <jdelvare@suse.de>
1da177e4 LT	4	*
	5	* Based on the lm90 driver, with some ideas taken from the lm_sensors
	6	* lm92 driver as well.
	7	*
	8	* The LM92 is a sensor chip made by National Semiconductor. It reports
	9	* its own temperature with a 0.0625 deg resolution and a 0.33 deg
	10	* accuracy. Complete datasheet can be obtained from National's website
	11	* at:
	12	* http://www.national.com/pf/LM/LM92.html
	13	*
	14	* This driver also supports the MAX6635 sensor chip made by Maxim.
	15	* This chip is compatible with the LM92, but has a lesser accuracy
	16	* (1.0 deg). Complete datasheet can be obtained from Maxim's website
	17	* at:
	18	* http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3074
	19	*
	20	* Since the LM92 was the first chipset supported by this driver, most
	21	* comments will refer to this chipset, but are actually general and
	22	* concern all supported chipsets, unless mentioned otherwise.
	23	*
	24	* Support could easily be added for the National Semiconductor LM76
	25	* and Maxim MAX6633 and MAX6634 chips, which are mostly compatible
	26	* with the LM92.
	27	*
	28	* This program is free software; you can redistribute it and/or modify
	29	* it under the terms of the GNU General Public License as published by
	30	* the Free Software Foundation; either version 2 of the License, or
	31	* (at your option) any later version.
	32	*
	33	* This program is distributed in the hope that it will be useful,
	34	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	35	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	36	* GNU General Public License for more details.
1da177e4 LT	37	*/
	38
	39	#include <linux/module.h>
	40	#include <linux/init.h>
	41	#include <linux/slab.h>
	42	#include <linux/i2c.h>
943b0830	43	#include <linux/hwmon.h>
6cb59e91	44	#include <linux/hwmon-sysfs.h>
943b0830	45	#include <linux/err.h>
9a61bf63	46	#include <linux/mutex.h>
dcd8f392	47	#include <linux/jiffies.h>
1da177e4	48
a318afd8 GR	49	/*
	50	* The LM92 and MAX6635 have 2 two-state pins for address selection,
	51	* resulting in 4 possible addresses.
	52	*/
25e9c86d MH	53	static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b,
25e9c86d MH	54	I2C_CLIENT_END };
10ecacd7	55	enum chips { lm92, max6635 };
1da177e4	56
1da177e4 LT	57	/* The LM92 registers */
	58	#define LM92_REG_CONFIG 0x01 /* 8-bit, RW */
	59	#define LM92_REG_TEMP 0x00 /* 16-bit, RO */
	60	#define LM92_REG_TEMP_HYST 0x02 /* 16-bit, RW */
	61	#define LM92_REG_TEMP_CRIT 0x03 /* 16-bit, RW */
	62	#define LM92_REG_TEMP_LOW 0x04 /* 16-bit, RW */
	63	#define LM92_REG_TEMP_HIGH 0x05 /* 16-bit, RW */
	64	#define LM92_REG_MAN_ID 0x07 /* 16-bit, RO, LM92 only */
	65
a318afd8 GR	66	/*
	67	* The LM92 uses signed 13-bit values with LSB = 0.0625 degree Celsius,
	68	* left-justified in 16-bit registers. No rounding is done, with such
	69	* a resolution it's just not worth it. Note that the MAX6635 doesn't
	70	* make use of the 4 lower bits for limits (i.e. effective resolution
	71	* for limits is 1 degree Celsius).
	72	*/
1da177e4 LT	73	static inline int TEMP_FROM_REG(s16 reg)
	74	{
	75	return reg / 8 * 625 / 10;
	76	}
	77
5b963089	78	static inline s16 TEMP_TO_REG(long val)
1da177e4	79	{
5b963089	80	val = clamp_val(val, -60000, 160000);
1da177e4 LT	81	return val * 10 / 625 * 8;
	82	}
	83
	84	/* Alarm flags are stored in the 3 LSB of the temperature register */
	85	static inline u8 ALARMS_FROM_REG(s16 reg)
	86	{
	87	return reg & 0x0007;
	88	}
	89
b8fe58e9 GR	90	enum temp_index {
	91	t_input,
	92	t_crit,
	93	t_min,
	94	t_max,
	95	t_hyst,
	96	t_num_regs
	97	};
	98
	99	static const u8 regs[t_num_regs] = {
	100	[t_input] = LM92_REG_TEMP,
	101	[t_crit] = LM92_REG_TEMP_CRIT,
	102	[t_min] = LM92_REG_TEMP_LOW,
	103	[t_max] = LM92_REG_TEMP_HIGH,
	104	[t_hyst] = LM92_REG_TEMP_HYST,
	105	};
	106
1da177e4 LT	107	/* Client data (each client gets its own) */
1da177e4 LT	108	struct lm92_data {
030004b1	109	struct i2c_client *client;
9a61bf63	110	struct mutex update_lock;
1da177e4 LT	111	char valid; /* zero until following fields are valid */
	112	unsigned long last_updated; /* in jiffies */
	113
	114	/* registers values */
b8fe58e9	115	s16 temp[t_num_regs]; /* index with enum temp_index */
1da177e4 LT	116	};
1da177e4 LT	117
1da177e4 LT	118	/*
	119	* Sysfs attributes and callback functions
	120	*/
	121
	122	static struct lm92_data lm92_update_device(struct device dev)
	123	{
030004b1 GR	124	struct lm92_data *data = dev_get_drvdata(dev);
030004b1 GR	125	struct i2c_client *client = data->client;
b8fe58e9	126	int i;
1da177e4	127
9a61bf63	128	mutex_lock(&data->update_lock);
1da177e4	129
0665a1d6 GR	130	if (time_after(jiffies, data->last_updated + HZ) \|\|
0665a1d6 GR	131	!data->valid) {
1da177e4	132	dev_dbg(&client->dev, "Updating lm92 data\n");
b8fe58e9 GR	133	for (i = 0; i < t_num_regs; i++) {
	134	data->temp[i] =
	135	i2c_smbus_read_word_swapped(client, regs[i]);
	136	}
1da177e4 LT	137	data->last_updated = jiffies;
	138	data->valid = 1;
	139	}
	140
9a61bf63	141	mutex_unlock(&data->update_lock);
1da177e4 LT	142
	143	return data;
	144	}
	145
185c993f	146	static ssize_t temp_show(struct device dev, struct device_attribute devattr,
b8fe58e9 GR	147	char *buf)
	148	{
	149	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	150	struct lm92_data *data = lm92_update_device(dev);
	151
	152	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
1da177e4	153	}
1da177e4	154
185c993f GR	155	static ssize_t temp_store(struct device *dev,
	156	struct device_attribute devattr, const char buf,
	157	size_t count)
1da177e4	158	{
b8fe58e9	159	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
030004b1 GR	160	struct lm92_data *data = dev_get_drvdata(dev);
030004b1 GR	161	struct i2c_client *client = data->client;
b8fe58e9 GR	162	int nr = attr->index;
	163	long val;
	164	int err;
0665a1d6	165
b8fe58e9 GR	166	err = kstrtol(buf, 10, &val);
	167	if (err)
	168	return err;
	169
	170	mutex_lock(&data->update_lock);
	171	data->temp[nr] = TEMP_TO_REG(val);
	172	i2c_smbus_write_word_swapped(client, regs[nr], data->temp[nr]);
	173	mutex_unlock(&data->update_lock);
	174	return count;
1da177e4	175	}
b8fe58e9	176
185c993f	177	static ssize_t temp_hyst_show(struct device *dev,
b8fe58e9	178	struct device_attribute devattr, char buf)
1da177e4	179	{
b8fe58e9	180	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
1da177e4	181	struct lm92_data *data = lm92_update_device(dev);
0665a1d6	182
b8fe58e9 GR	183	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index])
b8fe58e9 GR	184	- TEMP_FROM_REG(data->temp[t_hyst]));
1da177e4	185	}
b8fe58e9	186
3dba95df JL	187	static ssize_t temp1_min_hyst_show(struct device *dev,
3dba95df JL	188	struct device_attribute attr, char buf)
1da177e4 LT	189	{
1da177e4 LT	190	struct lm92_data *data = lm92_update_device(dev);
0665a1d6	191
b8fe58e9 GR	192	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[t_min])
b8fe58e9 GR	193	+ TEMP_FROM_REG(data->temp[t_hyst]));
1da177e4 LT	194	}
1da177e4 LT	195
185c993f GR	196	static ssize_t temp_hyst_store(struct device *dev,
	197	struct device_attribute *devattr,
	198	const char *buf, size_t count)
1da177e4	199	{
b8fe58e9	200	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
030004b1 GR	201	struct lm92_data *data = dev_get_drvdata(dev);
030004b1 GR	202	struct i2c_client *client = data->client;
a318afd8 GR	203	long val;
	204	int err;
	205
	206	err = kstrtol(buf, 10, &val);
	207	if (err)
	208	return err;
1da177e4	209
5b963089	210	val = clamp_val(val, -120000, 220000);
9a61bf63	211	mutex_lock(&data->update_lock);
0665a1d6	212	data->temp[t_hyst] =
5b963089	213	TEMP_TO_REG(TEMP_FROM_REG(data->temp[attr->index]) - val);
90f4102c	214	i2c_smbus_write_word_swapped(client, LM92_REG_TEMP_HYST,
5b963089	215	data->temp[t_hyst]);
9a61bf63	216	mutex_unlock(&data->update_lock);
1da177e4 LT	217	return count;
	218	}
	219
3dba95df	220	static ssize_t alarms_show(struct device dev, struct device_attribute attr,
a318afd8	221	char *buf)
1da177e4 LT	222	{
1da177e4 LT	223	struct lm92_data *data = lm92_update_device(dev);
0665a1d6	224
b8fe58e9	225	return sprintf(buf, "%d\n", ALARMS_FROM_REG(data->temp[t_input]));
1da177e4 LT	226	}
1da177e4 LT	227
185c993f	228	static ssize_t alarm_show(struct device dev, struct device_attribute attr,
6cb59e91 JD	229	char *buf)
	230	{
	231	int bitnr = to_sensor_dev_attr(attr)->index;
	232	struct lm92_data *data = lm92_update_device(dev);
b8fe58e9	233	return sprintf(buf, "%d\n", (data->temp[t_input] >> bitnr) & 1);
6cb59e91 JD	234	}
6cb59e91 JD	235
185c993f GR	236	static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, t_input);
	237	static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp, t_crit);
	238	static SENSOR_DEVICE_ATTR_RW(temp1_crit_hyst, temp_hyst, t_crit);
	239	static SENSOR_DEVICE_ATTR_RW(temp1_min, temp, t_min);
3dba95df	240	static DEVICE_ATTR_RO(temp1_min_hyst);
185c993f GR	241	static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, t_max);
185c993f GR	242	static SENSOR_DEVICE_ATTR_RO(temp1_max_hyst, temp_hyst, t_max);
3dba95df	243	static DEVICE_ATTR_RO(alarms);
185c993f GR	244	static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 2);
	245	static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, alarm, 0);
	246	static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 1);
1da177e4	247
1da177e4 LT	248	/*
	249	* Detection and registration
	250	*/
	251
	252	static void lm92_init_client(struct i2c_client *client)
	253	{
	254	u8 config;
	255
	256	/* Start the conversions if needed */
	257	config = i2c_smbus_read_byte_data(client, LM92_REG_CONFIG);
	258	if (config & 0x01)
	259	i2c_smbus_write_byte_data(client, LM92_REG_CONFIG,
	260	config & 0xFE);
	261	}
	262
030004b1	263	static struct attribute *lm92_attrs[] = {
b8fe58e9 GR	264	&sensor_dev_attr_temp1_input.dev_attr.attr,
	265	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	266	&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
	267	&sensor_dev_attr_temp1_min.dev_attr.attr,
0501a381	268	&dev_attr_temp1_min_hyst.attr,
b8fe58e9 GR	269	&sensor_dev_attr_temp1_max.dev_attr.attr,
b8fe58e9 GR	270	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
0501a381	271	&dev_attr_alarms.attr,
6cb59e91 JD	272	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	273	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
	274	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
0501a381 MH	275	NULL
0501a381 MH	276	};
030004b1	277	ATTRIBUTE_GROUPS(lm92);
0501a381	278
910e8dcf	279	/* Return 0 if detection is successful, -ENODEV otherwise */
310ec792	280	static int lm92_detect(struct i2c_client *new_client,
910e8dcf	281	struct i2c_board_info *info)
1da177e4	282	{
910e8dcf	283	struct i2c_adapter *adapter = new_client->adapter;
52df6440 JD	284	u8 config;
52df6440 JD	285	u16 man_id;
1da177e4 LT	286
	287	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
	288	\| I2C_FUNC_SMBUS_WORD_DATA))
910e8dcf	289	return -ENODEV;
1da177e4	290
52df6440 JD	291	config = i2c_smbus_read_byte_data(new_client, LM92_REG_CONFIG);
	292	man_id = i2c_smbus_read_word_data(new_client, LM92_REG_MAN_ID);
	293
	294	if ((config & 0xe0) == 0x00 && man_id == 0x0180)
	295	pr_info("lm92: Found National Semiconductor LM92 chip\n");
52df6440 JD	296	else
52df6440 JD	297	return -ENODEV;
1da177e4	298
910e8dcf JD	299	strlcpy(info->type, "lm92", I2C_NAME_SIZE);
	300
	301	return 0;
	302	}
	303
	304	static int lm92_probe(struct i2c_client *new_client,
	305	const struct i2c_device_id *id)
	306	{
030004b1	307	struct device *hwmon_dev;
910e8dcf	308	struct lm92_data *data;
910e8dcf	309
705375cc GR	310	data = devm_kzalloc(&new_client->dev, sizeof(struct lm92_data),
	311	GFP_KERNEL);
	312	if (!data)
	313	return -ENOMEM;
910e8dcf	314
030004b1	315	data->client = new_client;
9a61bf63	316	mutex_init(&data->update_lock);
1da177e4	317
1da177e4 LT	318	/* Initialize the chipset */
	319	lm92_init_client(new_client);
	320
030004b1 GR	321	hwmon_dev = devm_hwmon_device_register_with_groups(&new_client->dev,
	322	new_client->name,
	323	data, lm92_groups);
	324	return PTR_ERR_OR_ZERO(hwmon_dev);
1da177e4 LT	325	}
1da177e4 LT	326
1da177e4 LT	327	/*
	328	* Module and driver stuff
	329	*/
	330
910e8dcf	331	static const struct i2c_device_id lm92_id[] = {
10ecacd7 A	332	{ "lm92", lm92 },
10ecacd7 A	333	{ "max6635", max6635 },
910e8dcf JD	334	{ }
	335	};
	336	MODULE_DEVICE_TABLE(i2c, lm92_id);
	337
1da177e4	338	static struct i2c_driver lm92_driver = {
910e8dcf	339	.class = I2C_CLASS_HWMON,
cdaf7934	340	.driver = {
cdaf7934 LR	341	.name = "lm92",
cdaf7934 LR	342	},
910e8dcf	343	.probe = lm92_probe,
910e8dcf JD	344	.id_table = lm92_id,
910e8dcf JD	345	.detect = lm92_detect,
c3813d6a	346	.address_list = normal_i2c,
1da177e4 LT	347	};
1da177e4 LT	348
f0967eea	349	module_i2c_driver(lm92_driver);
1da177e4	350
7c81c60f	351	MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
1da177e4 LT	352	MODULE_DESCRIPTION("LM92/MAX6635 driver");
1da177e4 LT	353	MODULE_LICENSE("GPL");