[linux.git] / drivers / hwmon / tmp421.c

/* tmp421.c
 *
 * Copyright (C) 2009 Andre Prendel <[email protected]>
 * Preliminary support by:
 * Melvin Rook, Raymond Ng
 *
 * 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.
 */

/*
 * Driver for the Texas Instruments TMP421 SMBus temperature sensor IC.
 * Supported models: TMP421, TMP422, TMP423, TMP441, TMP442
 */

#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 <linux/of_device.h>
#include <linux/sysfs.h>

/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x2a, 0x4c, 0x4d, 0x4e, 0x4f,
					     I2C_CLIENT_END };

enum chips { tmp421, tmp422, tmp423, tmp441, tmp442 };

/* The TMP421 registers */
#define TMP421_STATUS_REG			0x08
#define TMP421_CONFIG_REG_1			0x09
#define TMP421_CONVERSION_RATE_REG		0x0B
#define TMP421_MANUFACTURER_ID_REG		0xFE
#define TMP421_DEVICE_ID_REG			0xFF

static const u8 TMP421_TEMP_MSB[4]		= { 0x00, 0x01, 0x02, 0x03 };
static const u8 TMP421_TEMP_LSB[4]		= { 0x10, 0x11, 0x12, 0x13 };

/* Flags */
#define TMP421_CONFIG_SHUTDOWN			0x40
#define TMP421_CONFIG_RANGE			0x04

/* Manufacturer / Device ID's */
#define TMP421_MANUFACTURER_ID			0x55
#define TMP421_DEVICE_ID			0x21
#define TMP422_DEVICE_ID			0x22
#define TMP423_DEVICE_ID			0x23
#define TMP441_DEVICE_ID			0x41
#define TMP442_DEVICE_ID			0x42

static const struct i2c_device_id tmp421_id[] = {
	{ "tmp421", 2 },
	{ "tmp422", 3 },
	{ "tmp423", 4 },
	{ "tmp441", 2 },
	{ "tmp442", 3 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, tmp421_id);

static const struct of_device_id tmp421_of_match[] = {
	{
		.compatible = "ti,tmp421",
		.data = (void *)2
	},
	{
		.compatible = "ti,tmp422",
		.data = (void *)3
	},
	{
		.compatible = "ti,tmp423",
		.data = (void *)4
	},
	{
		.compatible = "ti,tmp441",
		.data = (void *)2
	},
	{
		.compatible = "ti,tmp422",
		.data = (void *)3
	},
	{ },
};
MODULE_DEVICE_TABLE(of, tmp421_of_match);

struct tmp421_data {
	struct i2c_client *client;
	struct mutex update_lock;
	u32 temp_config[5];
	struct hwmon_channel_info temp_info;
	const struct hwmon_channel_info *info[2];
	struct hwmon_chip_info chip;
	char valid;
	unsigned long last_updated;
	unsigned long channels;
	u8 config;
	s16 temp[4];
};

static int temp_from_s16(s16 reg)
{
	/* Mask out status bits */
	int temp = reg & ~0xf;

	return (temp * 1000 + 128) / 256;
}

static int temp_from_u16(u16 reg)
{
	/* Mask out status bits */
	int temp = reg & ~0xf;

	/* Add offset for extended temperature range. */
	temp -= 64 * 256;

	return (temp * 1000 + 128) / 256;
}

static struct tmp421_data *tmp421_update_device(struct device *dev)
{
	struct tmp421_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 + 2 * HZ) || !data->valid) {
		data->config = i2c_smbus_read_byte_data(client,
			TMP421_CONFIG_REG_1);

		for (i = 0; i < data->channels; i++) {
			data->temp[i] = i2c_smbus_read_byte_data(client,
				TMP421_TEMP_MSB[i]) << 8;
			data->temp[i] |= i2c_smbus_read_byte_data(client,
				TMP421_TEMP_LSB[i]);
		}
		data->last_updated = jiffies;
		data->valid = 1;
	}

	mutex_unlock(&data->update_lock);

	return data;
}

static int tmp421_read(struct device *dev, enum hwmon_sensor_types type,
		       u32 attr, int channel, long *val)
{
	struct tmp421_data *tmp421 = tmp421_update_device(dev);

	switch (attr) {
	case hwmon_temp_input:
		if (tmp421->config & TMP421_CONFIG_RANGE)
			*val = temp_from_u16(tmp421->temp[channel]);
		else
			*val = temp_from_s16(tmp421->temp[channel]);
		return 0;
	case hwmon_temp_fault:
		/*
		 * The OPEN bit signals a fault. This is bit 0 of the temperature
		 * register (low byte).
		 */
		*val = tmp421->temp[channel] & 0x01;
		return 0;
	default:
		return -EOPNOTSUPP;
	}

}

static umode_t tmp421_is_visible(const void *data, enum hwmon_sensor_types type,
				 u32 attr, int channel)
{
	switch (attr) {
	case hwmon_temp_fault:
		if (channel == 0)
			return 0;
		return S_IRUGO;
	case hwmon_temp_input:
		return S_IRUGO;
	default:
		return 0;
	}
}

static int tmp421_init_client(struct i2c_client *client)
{
	int config, config_orig;

	/* Set the conversion rate to 2 Hz */
	i2c_smbus_write_byte_data(client, TMP421_CONVERSION_RATE_REG, 0x05);

	/* Start conversions (disable shutdown if necessary) */
	config = i2c_smbus_read_byte_data(client, TMP421_CONFIG_REG_1);
	if (config < 0) {
		dev_err(&client->dev,
			"Could not read configuration register (%d)\n", config);
		return config;
	}

	config_orig = config;
	config &= ~TMP421_CONFIG_SHUTDOWN;

	if (config != config_orig) {
		dev_info(&client->dev, "Enable monitoring chip\n");
		i2c_smbus_write_byte_data(client, TMP421_CONFIG_REG_1, config);
	}

	return 0;
}

static int tmp421_detect(struct i2c_client *client,
			 struct i2c_board_info *info)
{
	enum chips kind;
	struct i2c_adapter *adapter = client->adapter;
	const char * const names[] = { "TMP421", "TMP422", "TMP423",
				       "TMP441", "TMP442" };
	int addr = client->addr;
	u8 reg;

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

	reg = i2c_smbus_read_byte_data(client, TMP421_MANUFACTURER_ID_REG);
	if (reg != TMP421_MANUFACTURER_ID)
		return -ENODEV;

	reg = i2c_smbus_read_byte_data(client, TMP421_CONVERSION_RATE_REG);
	if (reg & 0xf8)
		return -ENODEV;

	reg = i2c_smbus_read_byte_data(client, TMP421_STATUS_REG);
	if (reg & 0x7f)
		return -ENODEV;

	reg = i2c_smbus_read_byte_data(client, TMP421_DEVICE_ID_REG);
	switch (reg) {
	case TMP421_DEVICE_ID:
		kind = tmp421;
		break;
	case TMP422_DEVICE_ID:
		if (addr == 0x2a)
			return -ENODEV;
		kind = tmp422;
		break;
	case TMP423_DEVICE_ID:
		if (addr != 0x4c && addr != 0x4d)
			return -ENODEV;
		kind = tmp423;
		break;
	case TMP441_DEVICE_ID:
		kind = tmp441;
		break;
	case TMP442_DEVICE_ID:
		if (addr != 0x4c && addr != 0x4d)
			return -ENODEV;
		kind = tmp442;
		break;
	default:
		return -ENODEV;
	}

	strlcpy(info->type, tmp421_id[kind].name, I2C_NAME_SIZE);
	dev_info(&adapter->dev, "Detected TI %s chip at 0x%02x\n",
		 names[kind], client->addr);

	return 0;
}

static const struct hwmon_ops tmp421_ops = {
	.is_visible = tmp421_is_visible,
	.read = tmp421_read,
};

static int tmp421_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	struct device *hwmon_dev;
	struct tmp421_data *data;
	int i, err;

	data = devm_kzalloc(dev, sizeof(struct tmp421_data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	mutex_init(&data->update_lock);
	if (client->dev.of_node)
		data->channels = (unsigned long)
			of_device_get_match_data(&client->dev);
	else
		data->channels = id->driver_data;
	data->client = client;

	err = tmp421_init_client(client);
	if (err)
		return err;

	for (i = 0; i < data->channels; i++)
		data->temp_config[i] = HWMON_T_INPUT | HWMON_T_FAULT;

	data->chip.ops = &tmp421_ops;
	data->chip.info = data->info;

	data->info[0] = &data->temp_info;

	data->temp_info.type = hwmon_temp;
	data->temp_info.config = data->temp_config;

	hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
							 data,
							 &data->chip,
							 NULL);
	return PTR_ERR_OR_ZERO(hwmon_dev);
}

static struct i2c_driver tmp421_driver = {
	.class = I2C_CLASS_HWMON,
	.driver = {
		.name	= "tmp421",
		.of_match_table = of_match_ptr(tmp421_of_match),
	},
	.probe = tmp421_probe,
	.id_table = tmp421_id,
	.detect = tmp421_detect,
	.address_list = normal_i2c,
};

module_i2c_driver(tmp421_driver);

MODULE_AUTHOR("Andre Prendel <[email protected]>");
MODULE_DESCRIPTION("Texas Instruments TMP421/422/423/441/442 temperature sensor driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
9410700b AP	1	/* tmp421.c
	2	*
	3	* Copyright (C) 2009 Andre Prendel <[email protected]>
	4	* Preliminary support by:
	5	* Melvin Rook, Raymond Ng
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
9410700b AP	16	*/
	17
	18	/*
	19	* Driver for the Texas Instruments TMP421 SMBus temperature sensor IC.
05c77ab2	20	* Supported models: TMP421, TMP422, TMP423, TMP441, TMP442
9410700b AP	21	*/
	22
	23	#include <linux/module.h>
	24	#include <linux/init.h>
	25	#include <linux/slab.h>
	26	#include <linux/jiffies.h>
	27	#include <linux/i2c.h>
	28	#include <linux/hwmon.h>
	29	#include <linux/hwmon-sysfs.h>
	30	#include <linux/err.h>
	31	#include <linux/mutex.h>
a1253027	32	#include <linux/of_device.h>
9410700b AP	33	#include <linux/sysfs.h>
	34
	35	/* Addresses to scan */
918ee91c JD	36	static const unsigned short normal_i2c[] = { 0x2a, 0x4c, 0x4d, 0x4e, 0x4f,
918ee91c JD	37	I2C_CLIENT_END };
9410700b	38
05c77ab2	39	enum chips { tmp421, tmp422, tmp423, tmp441, tmp442 };
9410700b AP	40
9410700b AP	41	/* The TMP421 registers */
a63ee9d8	42	#define TMP421_STATUS_REG 0x08
9410700b AP	43	#define TMP421_CONFIG_REG_1 0x09
	44	#define TMP421_CONVERSION_RATE_REG 0x0B
	45	#define TMP421_MANUFACTURER_ID_REG 0xFE
	46	#define TMP421_DEVICE_ID_REG 0xFF
	47
	48	static const u8 TMP421_TEMP_MSB[4] = { 0x00, 0x01, 0x02, 0x03 };
	49	static const u8 TMP421_TEMP_LSB[4] = { 0x10, 0x11, 0x12, 0x13 };
	50
	51	/* Flags */
	52	#define TMP421_CONFIG_SHUTDOWN 0x40
	53	#define TMP421_CONFIG_RANGE 0x04
	54
	55	/* Manufacturer / Device ID's */
	56	#define TMP421_MANUFACTURER_ID 0x55
	57	#define TMP421_DEVICE_ID 0x21
	58	#define TMP422_DEVICE_ID 0x22
	59	#define TMP423_DEVICE_ID 0x23
05c77ab2 GR	60	#define TMP441_DEVICE_ID 0x41
05c77ab2 GR	61	#define TMP442_DEVICE_ID 0x42
9410700b AP	62
9410700b AP	63	static const struct i2c_device_id tmp421_id[] = {
8d59582a JD	64	{ "tmp421", 2 },
	65	{ "tmp422", 3 },
	66	{ "tmp423", 4 },
05c77ab2 GR	67	{ "tmp441", 2 },
05c77ab2 GR	68	{ "tmp442", 3 },
9410700b AP	69	{ }
	70	};
	71	MODULE_DEVICE_TABLE(i2c, tmp421_id);
	72
a1253027 JMC	73	static const struct of_device_id tmp421_of_match[] = {
	74	{
	75	.compatible = "ti,tmp421",
	76	.data = (void *)2
	77	},
	78	{
	79	.compatible = "ti,tmp422",
	80	.data = (void *)3
	81	},
	82	{
	83	.compatible = "ti,tmp423",
	84	.data = (void *)4
	85	},
	86	{
	87	.compatible = "ti,tmp441",
	88	.data = (void *)2
	89	},
	90	{
	91	.compatible = "ti,tmp422",
	92	.data = (void *)3
	93	},
	94	{ },
	95	};
	96	MODULE_DEVICE_TABLE(of, tmp421_of_match);
	97
9410700b	98	struct tmp421_data {
276dac80	99	struct i2c_client *client;
9410700b	100	struct mutex update_lock;
bb43cc45 GR	101	u32 temp_config[5];
	102	struct hwmon_channel_info temp_info;
	103	const struct hwmon_channel_info *info[2];
	104	struct hwmon_chip_info chip;
9410700b AP	105	char valid;
9410700b AP	106	unsigned long last_updated;
a1253027	107	unsigned long channels;
9410700b AP	108	u8 config;
	109	s16 temp[4];
	110	};
	111
	112	static int temp_from_s16(s16 reg)
	113	{
a44908d7 JD	114	/* Mask out status bits */
a44908d7 JD	115	int temp = reg & ~0xf;
9410700b AP	116
	117	return (temp * 1000 + 128) / 256;
	118	}
	119
	120	static int temp_from_u16(u16 reg)
	121	{
a44908d7 JD	122	/* Mask out status bits */
a44908d7 JD	123	int temp = reg & ~0xf;
9410700b AP	124
	125	/* Add offset for extended temperature range. */
	126	temp -= 64 * 256;
	127
	128	return (temp * 1000 + 128) / 256;
	129	}
	130
	131	static struct tmp421_data tmp421_update_device(struct device dev)
	132	{
276dac80 GR	133	struct tmp421_data *data = dev_get_drvdata(dev);
276dac80 GR	134	struct i2c_client *client = data->client;
9410700b AP	135	int i;
	136
	137	mutex_lock(&data->update_lock);
	138
	139	if (time_after(jiffies, data->last_updated + 2 * HZ) \|\| !data->valid) {
	140	data->config = i2c_smbus_read_byte_data(client,
	141	TMP421_CONFIG_REG_1);
	142
8d59582a	143	for (i = 0; i < data->channels; i++) {
9410700b AP	144	data->temp[i] = i2c_smbus_read_byte_data(client,
	145	TMP421_TEMP_MSB[i]) << 8;
	146	data->temp[i] \|= i2c_smbus_read_byte_data(client,
	147	TMP421_TEMP_LSB[i]);
	148	}
	149	data->last_updated = jiffies;
	150	data->valid = 1;
	151	}
	152
	153	mutex_unlock(&data->update_lock);
	154
	155	return data;
	156	}
	157
bb43cc45 GR	158	static int tmp421_read(struct device *dev, enum hwmon_sensor_types type,
bb43cc45 GR	159	u32 attr, int channel, long *val)
9410700b	160	{
bb43cc45 GR	161	struct tmp421_data *tmp421 = tmp421_update_device(dev);
	162
	163	switch (attr) {
	164	case hwmon_temp_input:
	165	if (tmp421->config & TMP421_CONFIG_RANGE)
	166	*val = temp_from_u16(tmp421->temp[channel]);
	167	else
	168	*val = temp_from_s16(tmp421->temp[channel]);
	169	return 0;
	170	case hwmon_temp_fault:
	171	/*
	172	* The OPEN bit signals a fault. This is bit 0 of the temperature
	173	* register (low byte).
	174	*/
	175	*val = tmp421->temp[channel] & 0x01;
	176	return 0;
	177	default:
	178	return -EOPNOTSUPP;
	179	}
9410700b	180
9410700b AP	181	}
9410700b AP	182
bb43cc45 GR	183	static umode_t tmp421_is_visible(const void *data, enum hwmon_sensor_types type,
bb43cc45 GR	184	u32 attr, int channel)
9410700b	185	{
bb43cc45 GR	186	switch (attr) {
	187	case hwmon_temp_fault:
	188	if (channel == 0)
	189	return 0;
	190	return S_IRUGO;
	191	case hwmon_temp_input:
	192	return S_IRUGO;
	193	default:
	194	return 0;
	195	}
9410700b AP	196	}
9410700b AP	197
9410700b AP	198	static int tmp421_init_client(struct i2c_client *client)
	199	{
	200	int config, config_orig;
	201
	202	/* Set the conversion rate to 2 Hz */
	203	i2c_smbus_write_byte_data(client, TMP421_CONVERSION_RATE_REG, 0x05);
	204
	205	/* Start conversions (disable shutdown if necessary) */
	206	config = i2c_smbus_read_byte_data(client, TMP421_CONFIG_REG_1);
	207	if (config < 0) {
b55f3757 GR	208	dev_err(&client->dev,
b55f3757 GR	209	"Could not read configuration register (%d)\n", config);
010a166a	210	return config;
9410700b AP	211	}
	212
	213	config_orig = config;
	214	config &= ~TMP421_CONFIG_SHUTDOWN;
	215
	216	if (config != config_orig) {
	217	dev_info(&client->dev, "Enable monitoring chip\n");
	218	i2c_smbus_write_byte_data(client, TMP421_CONFIG_REG_1, config);
	219	}
	220
	221	return 0;
	222	}
	223
310ec792	224	static int tmp421_detect(struct i2c_client *client,
9410700b AP	225	struct i2c_board_info *info)
9410700b AP	226	{
dbe73c8f	227	enum chips kind;
9410700b	228	struct i2c_adapter *adapter = client->adapter;
05c77ab2 GR	229	const char * const names[] = { "TMP421", "TMP422", "TMP423",
05c77ab2 GR	230	"TMP441", "TMP442" };
a63ee9d8	231	int addr = client->addr;
dbe73c8f	232	u8 reg;
9410700b AP	233
	234	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	235	return -ENODEV;
	236
dbe73c8f JD	237	reg = i2c_smbus_read_byte_data(client, TMP421_MANUFACTURER_ID_REG);
	238	if (reg != TMP421_MANUFACTURER_ID)
	239	return -ENODEV;
	240
a63ee9d8 GR	241	reg = i2c_smbus_read_byte_data(client, TMP421_CONVERSION_RATE_REG);
	242	if (reg & 0xf8)
	243	return -ENODEV;
	244
	245	reg = i2c_smbus_read_byte_data(client, TMP421_STATUS_REG);
	246	if (reg & 0x7f)
	247	return -ENODEV;
	248
dbe73c8f JD	249	reg = i2c_smbus_read_byte_data(client, TMP421_DEVICE_ID_REG);
	250	switch (reg) {
	251	case TMP421_DEVICE_ID:
	252	kind = tmp421;
	253	break;
	254	case TMP422_DEVICE_ID:
a63ee9d8 GR	255	if (addr == 0x2a)
a63ee9d8 GR	256	return -ENODEV;
dbe73c8f JD	257	kind = tmp422;
	258	break;
	259	case TMP423_DEVICE_ID:
a63ee9d8 GR	260	if (addr != 0x4c && addr != 0x4d)
a63ee9d8 GR	261	return -ENODEV;
dbe73c8f JD	262	kind = tmp423;
dbe73c8f JD	263	break;
05c77ab2 GR	264	case TMP441_DEVICE_ID:
	265	kind = tmp441;
	266	break;
	267	case TMP442_DEVICE_ID:
	268	if (addr != 0x4c && addr != 0x4d)
	269	return -ENODEV;
	270	kind = tmp442;
	271	break;
dbe73c8f JD	272	default:
dbe73c8f JD	273	return -ENODEV;
9410700b	274	}
dbe73c8f	275
dc71afe5	276	strlcpy(info->type, tmp421_id[kind].name, I2C_NAME_SIZE);
9410700b	277	dev_info(&adapter->dev, "Detected TI %s chip at 0x%02x\n",
dc71afe5	278	names[kind], client->addr);
9410700b AP	279
	280	return 0;
	281	}
	282
bb43cc45 GR	283	static const struct hwmon_ops tmp421_ops = {
	284	.is_visible = tmp421_is_visible,
	285	.read = tmp421_read,
	286	};
	287
9410700b AP	288	static int tmp421_probe(struct i2c_client *client,
	289	const struct i2c_device_id *id)
	290	{
276dac80 GR	291	struct device *dev = &client->dev;
276dac80 GR	292	struct device *hwmon_dev;
9410700b	293	struct tmp421_data *data;
bb43cc45	294	int i, err;
9410700b	295
276dac80	296	data = devm_kzalloc(dev, sizeof(struct tmp421_data), GFP_KERNEL);
9410700b AP	297	if (!data)
	298	return -ENOMEM;
	299
9410700b	300	mutex_init(&data->update_lock);
a1253027 JMC	301	if (client->dev.of_node)
	302	data->channels = (unsigned long)
	303	of_device_get_match_data(&client->dev);
	304	else
	305	data->channels = id->driver_data;
276dac80	306	data->client = client;
9410700b AP	307
	308	err = tmp421_init_client(client);
	309	if (err)
f625e0fd	310	return err;
9410700b	311
bb43cc45 GR	312	for (i = 0; i < data->channels; i++)
	313	data->temp_config[i] = HWMON_T_INPUT \| HWMON_T_FAULT;
	314
	315	data->chip.ops = &tmp421_ops;
	316	data->chip.info = data->info;
	317
	318	data->info[0] = &data->temp_info;
	319
	320	data->temp_info.type = hwmon_temp;
	321	data->temp_info.config = data->temp_config;
	322
	323	hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
	324	data,
	325	&data->chip,
	326	NULL);
276dac80	327	return PTR_ERR_OR_ZERO(hwmon_dev);
9410700b AP	328	}
	329
	330	static struct i2c_driver tmp421_driver = {
	331	.class = I2C_CLASS_HWMON,
	332	.driver = {
	333	.name = "tmp421",
a1253027	334	.of_match_table = of_match_ptr(tmp421_of_match),
9410700b AP	335	},
9410700b AP	336	.probe = tmp421_probe,
9410700b AP	337	.id_table = tmp421_id,
9410700b AP	338	.detect = tmp421_detect,
c3813d6a	339	.address_list = normal_i2c,
9410700b AP	340	};
9410700b AP	341
f0967eea	342	module_i2c_driver(tmp421_driver);
9410700b AP	343
9410700b AP	344	MODULE_AUTHOR("Andre Prendel <[email protected]>");
05c77ab2	345	MODULE_DESCRIPTION("Texas Instruments TMP421/422/423/441/442 temperature sensor driver");
9410700b	346	MODULE_LICENSE("GPL");