[mirror_ubuntu-bionic-kernel.git] / drivers / hwmon / max6642.c

/*
 * Driver for +/-1 degree C, SMBus-Compatible Remote/Local Temperature Sensor
 * with Overtemperature Alarm
 *
 * Copyright (C) 2011 AppearTV AS
 *
 * Derived from:
 *
 *  Based on the max1619 driver.
 *  Copyright (C) 2003-2004 Oleksij Rempel <bug-track@fisher-privat.net>
 *                          Jean Delvare <jdelvare@suse.de>
 *
 * The MAX6642 is a sensor chip made by Maxim.
 * It reports up to two temperatures (its own plus up to
 * one external one). Complete datasheet can be
 * obtained from Maxim's website at:
 *   http://datasheets.maxim-ic.com/en/ds/MAX6642.pdf
 *
 * 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 <linux/sysfs.h>

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

/*
 * The MAX6642 registers
 */

#define MAX6642_REG_R_MAN_ID		0xFE
#define MAX6642_REG_R_CONFIG		0x03
#define MAX6642_REG_W_CONFIG		0x09
#define MAX6642_REG_R_STATUS		0x02
#define MAX6642_REG_R_LOCAL_TEMP	0x00
#define MAX6642_REG_R_LOCAL_TEMPL	0x11
#define MAX6642_REG_R_LOCAL_HIGH	0x05
#define MAX6642_REG_W_LOCAL_HIGH	0x0B
#define MAX6642_REG_R_REMOTE_TEMP	0x01
#define MAX6642_REG_R_REMOTE_TEMPL	0x10
#define MAX6642_REG_R_REMOTE_HIGH	0x07
#define MAX6642_REG_W_REMOTE_HIGH	0x0D

/*
 * Conversions
 */

static int temp_from_reg10(int val)
{
	return val * 250;
}

static int temp_from_reg(int val)
{
	return val * 1000;
}

static int temp_to_reg(int val)
{
	return val / 1000;
}

/*
 * Client data (each client gets its own)
 */

struct max6642_data {
	struct i2c_client *client;
	struct mutex update_lock;
	bool valid; /* zero until following fields are valid */
	unsigned long last_updated; /* in jiffies */

	/* registers values */
	u16 temp_input[2]; /* local/remote */
	u16 temp_high[2]; /* local/remote */
	u8 alarms;
};

/*
 * Real code
 */

static void max6642_init_client(struct max6642_data *data,
				struct i2c_client *client)
{
	u8 config;

	/*
	 * Start the conversions.
	 */
	config = i2c_smbus_read_byte_data(client, MAX6642_REG_R_CONFIG);
	if (config & 0x40)
		i2c_smbus_write_byte_data(client, MAX6642_REG_W_CONFIG,
					  config & 0xBF); /* run */

	data->temp_high[0] = i2c_smbus_read_byte_data(client,
				MAX6642_REG_R_LOCAL_HIGH);
	data->temp_high[1] = i2c_smbus_read_byte_data(client,
				MAX6642_REG_R_REMOTE_HIGH);
}

/* Return 0 if detection is successful, -ENODEV otherwise */
static int max6642_detect(struct i2c_client *client,
			  struct i2c_board_info *info)
{
	struct i2c_adapter *adapter = client->adapter;
	u8 reg_config, reg_status, man_id;

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

	/* identification */
	man_id = i2c_smbus_read_byte_data(client, MAX6642_REG_R_MAN_ID);
	if (man_id != 0x4D)
		return -ENODEV;

	/* sanity check */
	if (i2c_smbus_read_byte_data(client, 0x04) != 0x4D
	    || i2c_smbus_read_byte_data(client, 0x06) != 0x4D
	    || i2c_smbus_read_byte_data(client, 0xff) != 0x4D)
		return -ENODEV;

	/*
	 * We read the config and status register, the 4 lower bits in the
	 * config register should be zero and bit 5, 3, 1 and 0 should be
	 * zero in the status register.
	 */
	reg_config = i2c_smbus_read_byte_data(client, MAX6642_REG_R_CONFIG);
	if ((reg_config & 0x0f) != 0x00)
		return -ENODEV;

	/* in between, another round of sanity checks */
	if (i2c_smbus_read_byte_data(client, 0x04) != reg_config
	    || i2c_smbus_read_byte_data(client, 0x06) != reg_config
	    || i2c_smbus_read_byte_data(client, 0xff) != reg_config)
		return -ENODEV;

	reg_status = i2c_smbus_read_byte_data(client, MAX6642_REG_R_STATUS);
	if ((reg_status & 0x2b) != 0x00)
		return -ENODEV;

	strlcpy(info->type, "max6642", I2C_NAME_SIZE);

	return 0;
}

static struct max6642_data *max6642_update_device(struct device *dev)
{
	struct max6642_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	u16 val, tmp;

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
		dev_dbg(dev, "Updating max6642 data.\n");
		val = i2c_smbus_read_byte_data(client,
					MAX6642_REG_R_LOCAL_TEMPL);
		tmp = (val >> 6) & 3;
		val = i2c_smbus_read_byte_data(client,
					MAX6642_REG_R_LOCAL_TEMP);
		val = (val << 2) | tmp;
		data->temp_input[0] = val;
		val = i2c_smbus_read_byte_data(client,
					MAX6642_REG_R_REMOTE_TEMPL);
		tmp = (val >> 6) & 3;
		val = i2c_smbus_read_byte_data(client,
					MAX6642_REG_R_REMOTE_TEMP);
		val = (val << 2) | tmp;
		data->temp_input[1] = val;
		data->alarms = i2c_smbus_read_byte_data(client,
					MAX6642_REG_R_STATUS);

		data->last_updated = jiffies;
		data->valid = 1;
	}

	mutex_unlock(&data->update_lock);

	return data;
}

/*
 * Sysfs stuff
 */

static ssize_t show_temp_max10(struct device *dev,
			       struct device_attribute *dev_attr, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
	struct max6642_data *data = max6642_update_device(dev);

	return sprintf(buf, "%d\n",
		       temp_from_reg10(data->temp_input[attr->index]));
}

static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
	struct max6642_data *data = max6642_update_device(dev);

	return sprintf(buf, "%d\n", temp_from_reg(data->temp_high[attr2->nr]));
}

static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
			    const char *buf, size_t count)
{
	struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
	struct max6642_data *data = dev_get_drvdata(dev);
	unsigned long val;
	int err;

	err = kstrtoul(buf, 10, &val);
	if (err < 0)
		return err;

	mutex_lock(&data->update_lock);
	data->temp_high[attr2->nr] = clamp_val(temp_to_reg(val), 0, 255);
	i2c_smbus_write_byte_data(data->client, attr2->index,
				  data->temp_high[attr2->nr]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	int bitnr = to_sensor_dev_attr(attr)->index;
	struct max6642_data *data = max6642_update_device(dev);
	return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
}

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_max10, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_max10, NULL, 1);
static SENSOR_DEVICE_ATTR_2(temp1_max, S_IWUSR | S_IRUGO, show_temp_max,
			    set_temp_max, 0, MAX6642_REG_W_LOCAL_HIGH);
static SENSOR_DEVICE_ATTR_2(temp2_max, S_IWUSR | S_IRUGO, show_temp_max,
			    set_temp_max, 1, MAX6642_REG_W_REMOTE_HIGH);
static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);

static struct attribute *max6642_attrs[] = {
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp2_max.dev_attr.attr,

	&sensor_dev_attr_temp2_fault.dev_attr.attr,
	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	NULL
};
ATTRIBUTE_GROUPS(max6642);

static int max6642_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	struct max6642_data *data;
	struct device *hwmon_dev;

	data = devm_kzalloc(dev, sizeof(struct max6642_data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

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

	/* Initialize the MAX6642 chip */
	max6642_init_client(data, client);

	hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
							   client->name, data,
							   max6642_groups);
	return PTR_ERR_OR_ZERO(hwmon_dev);
}

/*
 * Driver data (common to all clients)
 */

static const struct i2c_device_id max6642_id[] = {
	{ "max6642", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, max6642_id);

static struct i2c_driver max6642_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "max6642",
	},
	.probe		= max6642_probe,
	.id_table	= max6642_id,
	.detect		= max6642_detect,
	.address_list	= normal_i2c,
};

module_i2c_driver(max6642_driver);

MODULE_AUTHOR("Per Dalen <per.dalen@appeartv.com>");
MODULE_DESCRIPTION("MAX6642 sensor driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
83bffbce PD	1	/*
	2	* Driver for +/-1 degree C, SMBus-Compatible Remote/Local Temperature Sensor
	3	* with Overtemperature Alarm
	4	*
	5	* Copyright (C) 2011 AppearTV AS
	6	*
	7	* Derived from:
	8	*
	9	* Based on the max1619 driver.
9292f055	10	* Copyright (C) 2003-2004 Oleksij Rempel <bug-track@fisher-privat.net>
7c81c60f	11	* Jean Delvare <jdelvare@suse.de>
83bffbce PD	12	*
	13	* The MAX6642 is a sensor chip made by Maxim.
	14	* It reports up to two temperatures (its own plus up to
	15	* one external one). Complete datasheet can be
	16	* obtained from Maxim's website at:
	17	* http://datasheets.maxim-ic.com/en/ds/MAX6642.pdf
	18	*
	19	* This program is free software; you can redistribute it and/or modify
	20	* it under the terms of the GNU General Public License as published by
	21	* the Free Software Foundation; either version 2 of the License, or
	22	* (at your option) any later version.
	23	*
	24	* This program is distributed in the hope that it will be useful,
	25	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	26	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	27	* GNU General Public License for more details.
	28	*
	29	* You should have received a copy of the GNU General Public License
	30	* along with this program; if not, write to the Free Software
	31	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	32	*/
	33
	34
	35	#include <linux/module.h>
	36	#include <linux/init.h>
	37	#include <linux/slab.h>
	38	#include <linux/jiffies.h>
	39	#include <linux/i2c.h>
	40	#include <linux/hwmon.h>
	41	#include <linux/hwmon-sysfs.h>
	42	#include <linux/err.h>
	43	#include <linux/mutex.h>
	44	#include <linux/sysfs.h>
	45
	46	static const unsigned short normal_i2c[] = {
	47	0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
	48
	49	/*
	50	* The MAX6642 registers
	51	*/
	52
	53	#define MAX6642_REG_R_MAN_ID 0xFE
	54	#define MAX6642_REG_R_CONFIG 0x03
	55	#define MAX6642_REG_W_CONFIG 0x09
	56	#define MAX6642_REG_R_STATUS 0x02
	57	#define MAX6642_REG_R_LOCAL_TEMP 0x00
	58	#define MAX6642_REG_R_LOCAL_TEMPL 0x11
	59	#define MAX6642_REG_R_LOCAL_HIGH 0x05
	60	#define MAX6642_REG_W_LOCAL_HIGH 0x0B
	61	#define MAX6642_REG_R_REMOTE_TEMP 0x01
	62	#define MAX6642_REG_R_REMOTE_TEMPL 0x10
	63	#define MAX6642_REG_R_REMOTE_HIGH 0x07
	64	#define MAX6642_REG_W_REMOTE_HIGH 0x0D
	65
	66	/*
	67	* Conversions
	68	*/
	69
	70	static int temp_from_reg10(int val)
	71	{
	72	return val * 250;
	73	}
	74
	75	static int temp_from_reg(int val)
76	{
77	return val * 1000;
78	}
79
80	static int temp_to_reg(int val)
81	{
82	return val / 1000;
83	}
84
85	/*
86	* Client data (each client gets its own)
87	*/
88
89	struct max6642_data {
9bd024e9	90	struct i2c_client *client;
83bffbce PD	91	struct mutex update_lock;
	92	bool valid; /* zero until following fields are valid */
	93	unsigned long last_updated; /* in jiffies */
	94
	95	/* registers values */
	96	u16 temp_input[2]; /* local/remote */
	97	u16 temp_high[2]; /* local/remote */
	98	u8 alarms;
	99	};
	100
	101	/*
	102	* Real code
	103	*/
	104
9bd024e9 GR	105	static void max6642_init_client(struct max6642_data *data,
9bd024e9 GR	106	struct i2c_client *client)
83bffbce PD	107	{
83bffbce PD	108	u8 config;
83bffbce PD	109
	110	/*
	111	* Start the conversions.
	112	*/
	113	config = i2c_smbus_read_byte_data(client, MAX6642_REG_R_CONFIG);
	114	if (config & 0x40)
	115	i2c_smbus_write_byte_data(client, MAX6642_REG_W_CONFIG,
	116	config & 0xBF); /* run */
	117
	118	data->temp_high[0] = i2c_smbus_read_byte_data(client,
	119	MAX6642_REG_R_LOCAL_HIGH);
	120	data->temp_high[1] = i2c_smbus_read_byte_data(client,
	121	MAX6642_REG_R_REMOTE_HIGH);
	122	}
	123
	124	/* Return 0 if detection is successful, -ENODEV otherwise */
	125	static int max6642_detect(struct i2c_client *client,
	126	struct i2c_board_info *info)
	127	{
	128	struct i2c_adapter *adapter = client->adapter;
	129	u8 reg_config, reg_status, man_id;
	130
	131	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	132	return -ENODEV;
	133
	134	/* identification */
	135	man_id = i2c_smbus_read_byte_data(client, MAX6642_REG_R_MAN_ID);
	136	if (man_id != 0x4D)
	137	return -ENODEV;
	138
942c1a92 PD	139	/* sanity check */
	140	if (i2c_smbus_read_byte_data(client, 0x04) != 0x4D
	141	\|\| i2c_smbus_read_byte_data(client, 0x06) != 0x4D
	142	\|\| i2c_smbus_read_byte_data(client, 0xff) != 0x4D)
	143	return -ENODEV;
	144
83bffbce PD	145	/*
	146	* We read the config and status register, the 4 lower bits in the
	147	* config register should be zero and bit 5, 3, 1 and 0 should be
	148	* zero in the status register.
	149	*/
	150	reg_config = i2c_smbus_read_byte_data(client, MAX6642_REG_R_CONFIG);
942c1a92 PD	151	if ((reg_config & 0x0f) != 0x00)
	152	return -ENODEV;
	153
	154	/* in between, another round of sanity checks */
	155	if (i2c_smbus_read_byte_data(client, 0x04) != reg_config
	156	\|\| i2c_smbus_read_byte_data(client, 0x06) != reg_config
	157	\|\| i2c_smbus_read_byte_data(client, 0xff) != reg_config)
	158	return -ENODEV;
	159
83bffbce	160	reg_status = i2c_smbus_read_byte_data(client, MAX6642_REG_R_STATUS);
942c1a92	161	if ((reg_status & 0x2b) != 0x00)
83bffbce PD	162	return -ENODEV;
	163
	164	strlcpy(info->type, "max6642", I2C_NAME_SIZE);
	165
	166	return 0;
	167	}
	168
	169	static struct max6642_data max6642_update_device(struct device dev)
	170	{
9bd024e9 GR	171	struct max6642_data *data = dev_get_drvdata(dev);
9bd024e9 GR	172	struct i2c_client *client = data->client;
83bffbce PD	173	u16 val, tmp;
	174
	175	mutex_lock(&data->update_lock);
	176
	177	if (time_after(jiffies, data->last_updated + HZ) \|\| !data->valid) {
9bd024e9	178	dev_dbg(dev, "Updating max6642 data.\n");
83bffbce PD	179	val = i2c_smbus_read_byte_data(client,
	180	MAX6642_REG_R_LOCAL_TEMPL);
	181	tmp = (val >> 6) & 3;
	182	val = i2c_smbus_read_byte_data(client,
	183	MAX6642_REG_R_LOCAL_TEMP);
	184	val = (val << 2) \| tmp;
	185	data->temp_input[0] = val;
	186	val = i2c_smbus_read_byte_data(client,
	187	MAX6642_REG_R_REMOTE_TEMPL);
	188	tmp = (val >> 6) & 3;
	189	val = i2c_smbus_read_byte_data(client,
	190	MAX6642_REG_R_REMOTE_TEMP);
	191	val = (val << 2) \| tmp;
	192	data->temp_input[1] = val;
	193	data->alarms = i2c_smbus_read_byte_data(client,
	194	MAX6642_REG_R_STATUS);
	195
	196	data->last_updated = jiffies;
	197	data->valid = 1;
	198	}
	199
	200	mutex_unlock(&data->update_lock);
	201
	202	return data;
	203	}
	204
	205	/*
	206	* Sysfs stuff
	207	*/
	208
	209	static ssize_t show_temp_max10(struct device *dev,
	210	struct device_attribute dev_attr, char buf)
	211	{
83bffbce	212	struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
9bd024e9	213	struct max6642_data *data = max6642_update_device(dev);
83bffbce PD	214
	215	return sprintf(buf, "%d\n",
	216	temp_from_reg10(data->temp_input[attr->index]));
	217	}
	218
	219	static ssize_t show_temp_max(struct device dev, struct device_attribute attr,
	220	char *buf)
	221	{
83bffbce	222	struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
9bd024e9	223	struct max6642_data *data = max6642_update_device(dev);
83bffbce PD	224
	225	return sprintf(buf, "%d\n", temp_from_reg(data->temp_high[attr2->nr]));
	226	}
	227
	228	static ssize_t set_temp_max(struct device dev, struct device_attribute attr,
	229	const char *buf, size_t count)
	230	{
9bd024e9 GR	231	struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
9bd024e9 GR	232	struct max6642_data *data = dev_get_drvdata(dev);
83bffbce PD	233	unsigned long val;
83bffbce PD	234	int err;
83bffbce	235
179c4fdb	236	err = kstrtoul(buf, 10, &val);
83bffbce PD	237	if (err < 0)
	238	return err;
	239
	240	mutex_lock(&data->update_lock);
2a844c14	241	data->temp_high[attr2->nr] = clamp_val(temp_to_reg(val), 0, 255);
9bd024e9	242	i2c_smbus_write_byte_data(data->client, attr2->index,
83bffbce PD	243	data->temp_high[attr2->nr]);
	244	mutex_unlock(&data->update_lock);
	245	return count;
	246	}
	247
	248	static ssize_t show_alarm(struct device dev, struct device_attribute attr,
	249	char *buf)
	250	{
	251	int bitnr = to_sensor_dev_attr(attr)->index;
	252	struct max6642_data *data = max6642_update_device(dev);
	253	return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
	254	}
	255
	256	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_max10, NULL, 0);
	257	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_max10, NULL, 1);
	258	static SENSOR_DEVICE_ATTR_2(temp1_max, S_IWUSR \| S_IRUGO, show_temp_max,
	259	set_temp_max, 0, MAX6642_REG_W_LOCAL_HIGH);
	260	static SENSOR_DEVICE_ATTR_2(temp2_max, S_IWUSR \| S_IRUGO, show_temp_max,
	261	set_temp_max, 1, MAX6642_REG_W_REMOTE_HIGH);
614198bb	262	static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
83bffbce PD	263	static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
	264	static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
	265
9bd024e9	266	static struct attribute *max6642_attrs[] = {
83bffbce PD	267	&sensor_dev_attr_temp1_input.dev_attr.attr,
	268	&sensor_dev_attr_temp2_input.dev_attr.attr,
	269	&sensor_dev_attr_temp1_max.dev_attr.attr,
	270	&sensor_dev_attr_temp2_max.dev_attr.attr,
	271
614198bb	272	&sensor_dev_attr_temp2_fault.dev_attr.attr,
83bffbce PD	273	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	274	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	275	NULL
	276	};
9bd024e9	277	ATTRIBUTE_GROUPS(max6642);
83bffbce	278
9bd024e9	279	static int max6642_probe(struct i2c_client *client,
83bffbce PD	280	const struct i2c_device_id *id)
83bffbce PD	281	{
9bd024e9	282	struct device *dev = &client->dev;
83bffbce	283	struct max6642_data *data;
9bd024e9	284	struct device *hwmon_dev;
83bffbce	285
9bd024e9	286	data = devm_kzalloc(dev, sizeof(struct max6642_data), GFP_KERNEL);
96f316c2 GR	287	if (!data)
96f316c2 GR	288	return -ENOMEM;
83bffbce	289
9bd024e9	290	data->client = client;
83bffbce PD	291	mutex_init(&data->update_lock);
	292
	293	/* Initialize the MAX6642 chip */
9bd024e9	294	max6642_init_client(data, client);
83bffbce	295
9bd024e9 GR	296	hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
	297	client->name, data,
	298	max6642_groups);
e5840c78	299	return PTR_ERR_OR_ZERO(hwmon_dev);
83bffbce PD	300	}
	301
	302	/*
	303	* Driver data (common to all clients)
	304	*/
	305
	306	static const struct i2c_device_id max6642_id[] = {
	307	{ "max6642", 0 },
	308	{ }
	309	};
	310	MODULE_DEVICE_TABLE(i2c, max6642_id);
	311
	312	static struct i2c_driver max6642_driver = {
	313	.class = I2C_CLASS_HWMON,
	314	.driver = {
	315	.name = "max6642",
	316	},
	317	.probe = max6642_probe,
83bffbce PD	318	.id_table = max6642_id,
	319	.detect = max6642_detect,
	320	.address_list = normal_i2c,
	321	};
	322
f0967eea	323	module_i2c_driver(max6642_driver);
83bffbce PD	324
	325	MODULE_AUTHOR("Per Dalen <per.dalen@appeartv.com>");
	326	MODULE_DESCRIPTION("MAX6642 sensor driver");
	327	MODULE_LICENSE("GPL");