[thirdparty/kernel/stable.git] / drivers / hwmon / lm92.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * 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.
 */

#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
c942fddf	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/*
1da177e4 LT	3	* lm92 - Hardware monitoring driver
7c81c60f	4	* Copyright (C) 2005-2008 Jean Delvare <jdelvare@suse.de>
1da177e4 LT	5	*
	6	* Based on the lm90 driver, with some ideas taken from the lm_sensors
	7	* lm92 driver as well.
	8	*
	9	* The LM92 is a sensor chip made by National Semiconductor. It reports
	10	* its own temperature with a 0.0625 deg resolution and a 0.33 deg
	11	* accuracy. Complete datasheet can be obtained from National's website
	12	* at:
	13	* http://www.national.com/pf/LM/LM92.html
	14	*
	15	* This driver also supports the MAX6635 sensor chip made by Maxim.
	16	* This chip is compatible with the LM92, but has a lesser accuracy
	17	* (1.0 deg). Complete datasheet can be obtained from Maxim's website
	18	* at:
	19	* http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3074
	20	*
	21	* Since the LM92 was the first chipset supported by this driver, most
	22	* comments will refer to this chipset, but are actually general and
	23	* concern all supported chipsets, unless mentioned otherwise.
	24	*
	25	* Support could easily be added for the National Semiconductor LM76
	26	* and Maxim MAX6633 and MAX6634 chips, which are mostly compatible
	27	* with the LM92.
1da177e4 LT	28	*/
	29
	30	#include <linux/module.h>
	31	#include <linux/init.h>
	32	#include <linux/slab.h>
	33	#include <linux/i2c.h>
943b0830	34	#include <linux/hwmon.h>
6cb59e91	35	#include <linux/hwmon-sysfs.h>
943b0830	36	#include <linux/err.h>
9a61bf63	37	#include <linux/mutex.h>
dcd8f392	38	#include <linux/jiffies.h>
1da177e4	39
a318afd8 GR	40	/*
	41	* The LM92 and MAX6635 have 2 two-state pins for address selection,
	42	* resulting in 4 possible addresses.
	43	*/
25e9c86d MH	44	static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b,
25e9c86d MH	45	I2C_CLIENT_END };
10ecacd7	46	enum chips { lm92, max6635 };
1da177e4	47
1da177e4 LT	48	/* The LM92 registers */
	49	#define LM92_REG_CONFIG 0x01 /* 8-bit, RW */
	50	#define LM92_REG_TEMP 0x00 /* 16-bit, RO */
	51	#define LM92_REG_TEMP_HYST 0x02 /* 16-bit, RW */
	52	#define LM92_REG_TEMP_CRIT 0x03 /* 16-bit, RW */
	53	#define LM92_REG_TEMP_LOW 0x04 /* 16-bit, RW */
	54	#define LM92_REG_TEMP_HIGH 0x05 /* 16-bit, RW */
	55	#define LM92_REG_MAN_ID 0x07 /* 16-bit, RO, LM92 only */
	56
a318afd8 GR	57	/*
	58	* The LM92 uses signed 13-bit values with LSB = 0.0625 degree Celsius,
	59	* left-justified in 16-bit registers. No rounding is done, with such
	60	* a resolution it's just not worth it. Note that the MAX6635 doesn't
	61	* make use of the 4 lower bits for limits (i.e. effective resolution
	62	* for limits is 1 degree Celsius).
	63	*/
1da177e4 LT	64	static inline int TEMP_FROM_REG(s16 reg)
	65	{
	66	return reg / 8 * 625 / 10;
	67	}
	68
5b963089	69	static inline s16 TEMP_TO_REG(long val)
1da177e4	70	{
5b963089	71	val = clamp_val(val, -60000, 160000);
1da177e4 LT	72	return val * 10 / 625 * 8;
	73	}
	74
	75	/* Alarm flags are stored in the 3 LSB of the temperature register */
	76	static inline u8 ALARMS_FROM_REG(s16 reg)
	77	{
	78	return reg & 0x0007;
	79	}
	80
b8fe58e9 GR	81	enum temp_index {
	82	t_input,
	83	t_crit,
	84	t_min,
	85	t_max,
	86	t_hyst,
	87	t_num_regs
	88	};
	89
	90	static const u8 regs[t_num_regs] = {
	91	[t_input] = LM92_REG_TEMP,
	92	[t_crit] = LM92_REG_TEMP_CRIT,
	93	[t_min] = LM92_REG_TEMP_LOW,
	94	[t_max] = LM92_REG_TEMP_HIGH,
	95	[t_hyst] = LM92_REG_TEMP_HYST,
	96	};
	97
1da177e4 LT	98	/* Client data (each client gets its own) */
1da177e4 LT	99	struct lm92_data {
030004b1	100	struct i2c_client *client;
9a61bf63	101	struct mutex update_lock;
1da177e4 LT	102	char valid; /* zero until following fields are valid */
	103	unsigned long last_updated; /* in jiffies */
	104
	105	/* registers values */
b8fe58e9	106	s16 temp[t_num_regs]; /* index with enum temp_index */
1da177e4 LT	107	};
1da177e4 LT	108
1da177e4 LT	109	/*
	110	* Sysfs attributes and callback functions
	111	*/
	112
	113	static struct lm92_data lm92_update_device(struct device dev)
	114	{
030004b1 GR	115	struct lm92_data *data = dev_get_drvdata(dev);
030004b1 GR	116	struct i2c_client *client = data->client;
b8fe58e9	117	int i;
1da177e4	118
9a61bf63	119	mutex_lock(&data->update_lock);
1da177e4	120
0665a1d6 GR	121	if (time_after(jiffies, data->last_updated + HZ) \|\|
0665a1d6 GR	122	!data->valid) {
1da177e4	123	dev_dbg(&client->dev, "Updating lm92 data\n");
b8fe58e9 GR	124	for (i = 0; i < t_num_regs; i++) {
	125	data->temp[i] =
	126	i2c_smbus_read_word_swapped(client, regs[i]);
	127	}
1da177e4 LT	128	data->last_updated = jiffies;
	129	data->valid = 1;
	130	}
	131
9a61bf63	132	mutex_unlock(&data->update_lock);
1da177e4 LT	133
	134	return data;
	135	}
	136
185c993f	137	static ssize_t temp_show(struct device dev, struct device_attribute devattr,
b8fe58e9 GR	138	char *buf)
	139	{
	140	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	141	struct lm92_data *data = lm92_update_device(dev);
	142
	143	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
1da177e4	144	}
1da177e4	145
185c993f GR	146	static ssize_t temp_store(struct device *dev,
	147	struct device_attribute devattr, const char buf,
	148	size_t count)
1da177e4	149	{
b8fe58e9	150	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
030004b1 GR	151	struct lm92_data *data = dev_get_drvdata(dev);
030004b1 GR	152	struct i2c_client *client = data->client;
b8fe58e9 GR	153	int nr = attr->index;
	154	long val;
	155	int err;
0665a1d6	156
b8fe58e9 GR	157	err = kstrtol(buf, 10, &val);
	158	if (err)
	159	return err;
	160
	161	mutex_lock(&data->update_lock);
	162	data->temp[nr] = TEMP_TO_REG(val);
	163	i2c_smbus_write_word_swapped(client, regs[nr], data->temp[nr]);
	164	mutex_unlock(&data->update_lock);
	165	return count;
1da177e4	166	}
b8fe58e9	167
185c993f	168	static ssize_t temp_hyst_show(struct device *dev,
b8fe58e9	169	struct device_attribute devattr, char buf)
1da177e4	170	{
b8fe58e9	171	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
1da177e4	172	struct lm92_data *data = lm92_update_device(dev);
0665a1d6	173
b8fe58e9 GR	174	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index])
b8fe58e9 GR	175	- TEMP_FROM_REG(data->temp[t_hyst]));
1da177e4	176	}
b8fe58e9	177
3dba95df JL	178	static ssize_t temp1_min_hyst_show(struct device *dev,
3dba95df JL	179	struct device_attribute attr, char buf)
1da177e4 LT	180	{
1da177e4 LT	181	struct lm92_data *data = lm92_update_device(dev);
0665a1d6	182
b8fe58e9 GR	183	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[t_min])
b8fe58e9 GR	184	+ TEMP_FROM_REG(data->temp[t_hyst]));
1da177e4 LT	185	}
1da177e4 LT	186
185c993f GR	187	static ssize_t temp_hyst_store(struct device *dev,
	188	struct device_attribute *devattr,
	189	const char *buf, size_t count)
1da177e4	190	{
b8fe58e9	191	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
030004b1 GR	192	struct lm92_data *data = dev_get_drvdata(dev);
030004b1 GR	193	struct i2c_client *client = data->client;
a318afd8 GR	194	long val;
	195	int err;
	196
	197	err = kstrtol(buf, 10, &val);
	198	if (err)
	199	return err;
1da177e4	200
5b963089	201	val = clamp_val(val, -120000, 220000);
9a61bf63	202	mutex_lock(&data->update_lock);
0665a1d6	203	data->temp[t_hyst] =
5b963089	204	TEMP_TO_REG(TEMP_FROM_REG(data->temp[attr->index]) - val);
90f4102c	205	i2c_smbus_write_word_swapped(client, LM92_REG_TEMP_HYST,
5b963089	206	data->temp[t_hyst]);
9a61bf63	207	mutex_unlock(&data->update_lock);
1da177e4 LT	208	return count;
	209	}
	210
3dba95df	211	static ssize_t alarms_show(struct device dev, struct device_attribute attr,
a318afd8	212	char *buf)
1da177e4 LT	213	{
1da177e4 LT	214	struct lm92_data *data = lm92_update_device(dev);
0665a1d6	215
b8fe58e9	216	return sprintf(buf, "%d\n", ALARMS_FROM_REG(data->temp[t_input]));
1da177e4 LT	217	}
1da177e4 LT	218
185c993f	219	static ssize_t alarm_show(struct device dev, struct device_attribute attr,
6cb59e91 JD	220	char *buf)
	221	{
	222	int bitnr = to_sensor_dev_attr(attr)->index;
	223	struct lm92_data *data = lm92_update_device(dev);
b8fe58e9	224	return sprintf(buf, "%d\n", (data->temp[t_input] >> bitnr) & 1);
6cb59e91 JD	225	}
6cb59e91 JD	226
185c993f GR	227	static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, t_input);
	228	static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp, t_crit);
	229	static SENSOR_DEVICE_ATTR_RW(temp1_crit_hyst, temp_hyst, t_crit);
	230	static SENSOR_DEVICE_ATTR_RW(temp1_min, temp, t_min);
3dba95df	231	static DEVICE_ATTR_RO(temp1_min_hyst);
185c993f GR	232	static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, t_max);
185c993f GR	233	static SENSOR_DEVICE_ATTR_RO(temp1_max_hyst, temp_hyst, t_max);
3dba95df	234	static DEVICE_ATTR_RO(alarms);
185c993f GR	235	static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 2);
	236	static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, alarm, 0);
	237	static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 1);
1da177e4	238
1da177e4 LT	239	/*
	240	* Detection and registration
	241	*/
	242
	243	static void lm92_init_client(struct i2c_client *client)
	244	{
	245	u8 config;
	246
	247	/* Start the conversions if needed */
	248	config = i2c_smbus_read_byte_data(client, LM92_REG_CONFIG);
	249	if (config & 0x01)
	250	i2c_smbus_write_byte_data(client, LM92_REG_CONFIG,
	251	config & 0xFE);
	252	}
	253
030004b1	254	static struct attribute *lm92_attrs[] = {
b8fe58e9 GR	255	&sensor_dev_attr_temp1_input.dev_attr.attr,
	256	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	257	&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
	258	&sensor_dev_attr_temp1_min.dev_attr.attr,
0501a381	259	&dev_attr_temp1_min_hyst.attr,
b8fe58e9 GR	260	&sensor_dev_attr_temp1_max.dev_attr.attr,
b8fe58e9 GR	261	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
0501a381	262	&dev_attr_alarms.attr,
6cb59e91 JD	263	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	264	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
	265	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
0501a381 MH	266	NULL
0501a381 MH	267	};
030004b1	268	ATTRIBUTE_GROUPS(lm92);
0501a381	269
910e8dcf	270	/* Return 0 if detection is successful, -ENODEV otherwise */
310ec792	271	static int lm92_detect(struct i2c_client *new_client,
910e8dcf	272	struct i2c_board_info *info)
1da177e4	273	{
910e8dcf	274	struct i2c_adapter *adapter = new_client->adapter;
52df6440 JD	275	u8 config;
52df6440 JD	276	u16 man_id;
1da177e4 LT	277
	278	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
	279	\| I2C_FUNC_SMBUS_WORD_DATA))
910e8dcf	280	return -ENODEV;
1da177e4	281
52df6440 JD	282	config = i2c_smbus_read_byte_data(new_client, LM92_REG_CONFIG);
	283	man_id = i2c_smbus_read_word_data(new_client, LM92_REG_MAN_ID);
	284
	285	if ((config & 0xe0) == 0x00 && man_id == 0x0180)
	286	pr_info("lm92: Found National Semiconductor LM92 chip\n");
52df6440 JD	287	else
52df6440 JD	288	return -ENODEV;
1da177e4	289
910e8dcf JD	290	strlcpy(info->type, "lm92", I2C_NAME_SIZE);
	291
	292	return 0;
	293	}
	294
	295	static int lm92_probe(struct i2c_client *new_client,
	296	const struct i2c_device_id *id)
	297	{
030004b1	298	struct device *hwmon_dev;
910e8dcf	299	struct lm92_data *data;
910e8dcf	300
705375cc GR	301	data = devm_kzalloc(&new_client->dev, sizeof(struct lm92_data),
	302	GFP_KERNEL);
	303	if (!data)
	304	return -ENOMEM;
910e8dcf	305
030004b1	306	data->client = new_client;
9a61bf63	307	mutex_init(&data->update_lock);
1da177e4	308
1da177e4 LT	309	/* Initialize the chipset */
	310	lm92_init_client(new_client);
	311
030004b1 GR	312	hwmon_dev = devm_hwmon_device_register_with_groups(&new_client->dev,
	313	new_client->name,
	314	data, lm92_groups);
	315	return PTR_ERR_OR_ZERO(hwmon_dev);
1da177e4 LT	316	}
1da177e4 LT	317
1da177e4 LT	318	/*
	319	* Module and driver stuff
	320	*/
	321
910e8dcf	322	static const struct i2c_device_id lm92_id[] = {
10ecacd7 A	323	{ "lm92", lm92 },
10ecacd7 A	324	{ "max6635", max6635 },
910e8dcf JD	325	{ }
	326	};
	327	MODULE_DEVICE_TABLE(i2c, lm92_id);
	328
1da177e4	329	static struct i2c_driver lm92_driver = {
910e8dcf	330	.class = I2C_CLASS_HWMON,
cdaf7934	331	.driver = {
cdaf7934 LR	332	.name = "lm92",
cdaf7934 LR	333	},
910e8dcf	334	.probe = lm92_probe,
910e8dcf JD	335	.id_table = lm92_id,
910e8dcf JD	336	.detect = lm92_detect,
c3813d6a	337	.address_list = normal_i2c,
1da177e4 LT	338	};
1da177e4 LT	339
f0967eea	340	module_i2c_driver(lm92_driver);
1da177e4	341
7c81c60f	342	MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
1da177e4 LT	343	MODULE_DESCRIPTION("LM92/MAX6635 driver");
1da177e4 LT	344	MODULE_LICENSE("GPL");