[linux-2.6-block.git] / drivers / hwmon / max1619.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * max1619.c - Part of lm_sensors, Linux kernel modules for hardware
 *             monitoring
 * Copyright (C) 2003-2004 Oleksij Rempel <bug-track@fisher-privat.net>
 *                         Jean Delvare <jdelvare@suse.de>
 *
 * Based on the lm90 driver. The MAX1619 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://pdfserv.maxim-ic.com/en/ds/MAX1619.pdf
 */

#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[] = {
	0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };

/*
 * The MAX1619 registers
 */

#define MAX1619_REG_R_MAN_ID		0xFE
#define MAX1619_REG_R_CHIP_ID		0xFF
#define MAX1619_REG_R_CONFIG		0x03
#define MAX1619_REG_W_CONFIG		0x09
#define MAX1619_REG_R_CONVRATE		0x04
#define MAX1619_REG_W_CONVRATE		0x0A
#define MAX1619_REG_R_STATUS		0x02
#define MAX1619_REG_R_LOCAL_TEMP	0x00
#define MAX1619_REG_R_REMOTE_TEMP	0x01
#define MAX1619_REG_R_REMOTE_HIGH	0x07
#define MAX1619_REG_W_REMOTE_HIGH	0x0D
#define MAX1619_REG_R_REMOTE_LOW	0x08
#define MAX1619_REG_W_REMOTE_LOW	0x0E
#define MAX1619_REG_R_REMOTE_CRIT	0x10
#define MAX1619_REG_W_REMOTE_CRIT	0x12
#define MAX1619_REG_R_TCRIT_HYST	0x11
#define MAX1619_REG_W_TCRIT_HYST	0x13

/*
 * Conversions
 */

static int temp_from_reg(int val)
{
	return (val & 0x80 ? val-0x100 : val) * 1000;
}

static int temp_to_reg(int val)
{
	return (val < 0 ? val+0x100*1000 : val) / 1000;
}

enum temp_index {
	t_input1 = 0,
	t_input2,
	t_low2,
	t_high2,
	t_crit2,
	t_hyst2,
	t_num_regs
};

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

struct max1619_data {
	struct i2c_client *client;
	struct mutex update_lock;
	bool valid; /* false until following fields are valid */
	unsigned long last_updated; /* in jiffies */

	/* registers values */
	u8 temp[t_num_regs];	/* index with enum temp_index */
	u8 alarms;
};

static const u8 regs_read[t_num_regs] = {
	[t_input1] = MAX1619_REG_R_LOCAL_TEMP,
	[t_input2] = MAX1619_REG_R_REMOTE_TEMP,
	[t_low2] = MAX1619_REG_R_REMOTE_LOW,
	[t_high2] = MAX1619_REG_R_REMOTE_HIGH,
	[t_crit2] = MAX1619_REG_R_REMOTE_CRIT,
	[t_hyst2] = MAX1619_REG_R_TCRIT_HYST,
};

static const u8 regs_write[t_num_regs] = {
	[t_low2] = MAX1619_REG_W_REMOTE_LOW,
	[t_high2] = MAX1619_REG_W_REMOTE_HIGH,
	[t_crit2] = MAX1619_REG_W_REMOTE_CRIT,
	[t_hyst2] = MAX1619_REG_W_TCRIT_HYST,
};

static struct max1619_data *max1619_update_device(struct device *dev)
{
	struct max1619_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	int config, i;

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
		dev_dbg(&client->dev, "Updating max1619 data.\n");
		for (i = 0; i < t_num_regs; i++)
			data->temp[i] = i2c_smbus_read_byte_data(client,
					regs_read[i]);
		data->alarms = i2c_smbus_read_byte_data(client,
					MAX1619_REG_R_STATUS);
		/* If OVERT polarity is low, reverse alarm bit */
		config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
		if (!(config & 0x20))
			data->alarms ^= 0x02;

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

	mutex_unlock(&data->update_lock);

	return data;
}

/*
 * Sysfs stuff
 */

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 max1619_data *data = max1619_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 max1619_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	long val;
	int err = kstrtol(buf, 10, &val);
	if (err)
		return err;

	mutex_lock(&data->update_lock);
	data->temp[attr->index] = temp_to_reg(val);
	i2c_smbus_write_byte_data(client, regs_write[attr->index],
				  data->temp[attr->index]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t alarms_show(struct device *dev, struct device_attribute *attr,
			   char *buf)
{
	struct max1619_data *data = max1619_update_device(dev);
	return sprintf(buf, "%d\n", data->alarms);
}

static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	int bitnr = to_sensor_dev_attr(attr)->index;
	struct max1619_data *data = max1619_update_device(dev);
	return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
}

static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, t_input1);
static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, t_input2);
static SENSOR_DEVICE_ATTR_RW(temp2_min, temp, t_low2);
static SENSOR_DEVICE_ATTR_RW(temp2_max, temp, t_high2);
static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp, t_crit2);
static SENSOR_DEVICE_ATTR_RW(temp2_crit_hyst, temp, t_hyst2);

static DEVICE_ATTR_RO(alarms);
static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 1);
static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 2);
static SENSOR_DEVICE_ATTR_RO(temp2_min_alarm, alarm, 3);
static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 4);

static struct attribute *max1619_attrs[] = {
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp2_min.dev_attr.attr,
	&sensor_dev_attr_temp2_max.dev_attr.attr,
	&sensor_dev_attr_temp2_crit.dev_attr.attr,
	&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,

	&dev_attr_alarms.attr,
	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_fault.dev_attr.attr,
	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	NULL
};
ATTRIBUTE_GROUPS(max1619);

/* Return 0 if detection is successful, -ENODEV otherwise */
static int max1619_detect(struct i2c_client *client,
			  struct i2c_board_info *info)
{
	struct i2c_adapter *adapter = client->adapter;
	u8 reg_config, reg_convrate, reg_status, man_id, chip_id;

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

	/* detection */
	reg_config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
	reg_convrate = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONVRATE);
	reg_status = i2c_smbus_read_byte_data(client, MAX1619_REG_R_STATUS);
	if ((reg_config & 0x03) != 0x00
	 || reg_convrate > 0x07 || (reg_status & 0x61) != 0x00) {
		dev_dbg(&adapter->dev, "MAX1619 detection failed at 0x%02x\n",
			client->addr);
		return -ENODEV;
	}

	/* identification */
	man_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_MAN_ID);
	chip_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CHIP_ID);
	if (man_id != 0x4D || chip_id != 0x04) {
		dev_info(&adapter->dev,
			 "Unsupported chip (man_id=0x%02X, chip_id=0x%02X).\n",
			 man_id, chip_id);
		return -ENODEV;
	}

	strscpy(info->type, "max1619", I2C_NAME_SIZE);

	return 0;
}

static void max1619_init_client(struct i2c_client *client)
{
	u8 config;

	/*
	 * Start the conversions.
	 */
	i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE,
				  5); /* 2 Hz */
	config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
	if (config & 0x40)
		i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG,
					  config & 0xBF); /* run */
}

static int max1619_probe(struct i2c_client *new_client)
{
	struct max1619_data *data;
	struct device *hwmon_dev;

	data = devm_kzalloc(&new_client->dev, sizeof(struct max1619_data),
			    GFP_KERNEL);
	if (!data)
		return -ENOMEM;

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

	/* Initialize the MAX1619 chip */
	max1619_init_client(new_client);

	hwmon_dev = devm_hwmon_device_register_with_groups(&new_client->dev,
							   new_client->name,
							   data,
							   max1619_groups);
	return PTR_ERR_OR_ZERO(hwmon_dev);
}

static const struct i2c_device_id max1619_id[] = {
	{ "max1619" },
	{ }
};
MODULE_DEVICE_TABLE(i2c, max1619_id);

#ifdef CONFIG_OF
static const struct of_device_id max1619_of_match[] = {
	{ .compatible = "maxim,max1619", },
	{},
};

MODULE_DEVICE_TABLE(of, max1619_of_match);
#endif

static struct i2c_driver max1619_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "max1619",
		.of_match_table = of_match_ptr(max1619_of_match),
	},
	.probe		= max1619_probe,
	.id_table	= max1619_id,
	.detect		= max1619_detect,
	.address_list	= normal_i2c,
};

module_i2c_driver(max1619_driver);

MODULE_AUTHOR("Oleksij Rempel <bug-track@fisher-privat.net>, Jean Delvare <jdelvare@suse.de>");
MODULE_DESCRIPTION("MAX1619 sensor driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
c942fddf	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/*
	3	* max1619.c - Part of lm_sensors, Linux kernel modules for hardware
	4	* monitoring
9292f055	5	* Copyright (C) 2003-2004 Oleksij Rempel <bug-track@fisher-privat.net>
7c81c60f	6	* Jean Delvare <jdelvare@suse.de>
1da177e4 LT	7	*
	8	* Based on the lm90 driver. The MAX1619 is a sensor chip made by Maxim.
	9	* It reports up to two temperatures (its own plus up to
	10	* one external one). Complete datasheet can be
	11	* obtained from Maxim's website at:
	12	* http://pdfserv.maxim-ic.com/en/ds/MAX1619.pdf
1da177e4 LT	13	*/
1da177e4 LT	14
1da177e4 LT	15	#include <linux/module.h>
	16	#include <linux/init.h>
	17	#include <linux/slab.h>
	18	#include <linux/jiffies.h>
	19	#include <linux/i2c.h>
943b0830	20	#include <linux/hwmon.h>
71062ffc	21	#include <linux/hwmon-sysfs.h>
943b0830	22	#include <linux/err.h>
9a61bf63	23	#include <linux/mutex.h>
a5ebe668	24	#include <linux/sysfs.h>
1da177e4	25
25e9c86d MH	26	static const unsigned short normal_i2c[] = {
25e9c86d MH	27	0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
1da177e4	28
1da177e4 LT	29	/*
	30	* The MAX1619 registers
	31	*/
	32
	33	#define MAX1619_REG_R_MAN_ID 0xFE
	34	#define MAX1619_REG_R_CHIP_ID 0xFF
	35	#define MAX1619_REG_R_CONFIG 0x03
	36	#define MAX1619_REG_W_CONFIG 0x09
	37	#define MAX1619_REG_R_CONVRATE 0x04
	38	#define MAX1619_REG_W_CONVRATE 0x0A
	39	#define MAX1619_REG_R_STATUS 0x02
	40	#define MAX1619_REG_R_LOCAL_TEMP 0x00
	41	#define MAX1619_REG_R_REMOTE_TEMP 0x01
	42	#define MAX1619_REG_R_REMOTE_HIGH 0x07
	43	#define MAX1619_REG_W_REMOTE_HIGH 0x0D
	44	#define MAX1619_REG_R_REMOTE_LOW 0x08
	45	#define MAX1619_REG_W_REMOTE_LOW 0x0E
	46	#define MAX1619_REG_R_REMOTE_CRIT 0x10
	47	#define MAX1619_REG_W_REMOTE_CRIT 0x12
	48	#define MAX1619_REG_R_TCRIT_HYST 0x11
	49	#define MAX1619_REG_W_TCRIT_HYST 0x13
	50
	51	/*
a80e8ee6	52	* Conversions
1da177e4 LT	53	*/
1da177e4 LT	54
a80e8ee6 AM	55	static int temp_from_reg(int val)
	56	{
	57	return (val & 0x80 ? val-0x100 : val) * 1000;
	58	}
	59
	60	static int temp_to_reg(int val)
	61	{
	62	return (val < 0 ? val+0x100*1000 : val) / 1000;
	63	}
1da177e4	64
f8311196 GR	65	enum temp_index {
	66	t_input1 = 0,
	67	t_input2,
	68	t_low2,
	69	t_high2,
	70	t_crit2,
	71	t_hyst2,
	72	t_num_regs
	73	};
	74
1da177e4 LT	75	/*
	76	* Client data (each client gets its own)
	77	*/
	78
	79	struct max1619_data {
9f1513bd	80	struct i2c_client *client;
9a61bf63	81	struct mutex update_lock;
952a11ca	82	bool valid; /* false until following fields are valid */
1da177e4 LT	83	unsigned long last_updated; /* in jiffies */
	84
	85	/* registers values */
f8311196	86	u8 temp[t_num_regs]; /* index with enum temp_index */
8958dfb7	87	u8 alarms;
1da177e4 LT	88	};
1da177e4 LT	89
f8311196 GR	90	static const u8 regs_read[t_num_regs] = {
	91	[t_input1] = MAX1619_REG_R_LOCAL_TEMP,
	92	[t_input2] = MAX1619_REG_R_REMOTE_TEMP,
	93	[t_low2] = MAX1619_REG_R_REMOTE_LOW,
	94	[t_high2] = MAX1619_REG_R_REMOTE_HIGH,
	95	[t_crit2] = MAX1619_REG_R_REMOTE_CRIT,
	96	[t_hyst2] = MAX1619_REG_R_TCRIT_HYST,
	97	};
	98
	99	static const u8 regs_write[t_num_regs] = {
	100	[t_low2] = MAX1619_REG_W_REMOTE_LOW,
	101	[t_high2] = MAX1619_REG_W_REMOTE_HIGH,
	102	[t_crit2] = MAX1619_REG_W_REMOTE_CRIT,
	103	[t_hyst2] = MAX1619_REG_W_TCRIT_HYST,
	104	};
	105
40089a9f GR	106	static struct max1619_data max1619_update_device(struct device dev)
40089a9f GR	107	{
9f1513bd GR	108	struct max1619_data *data = dev_get_drvdata(dev);
9f1513bd GR	109	struct i2c_client *client = data->client;
f8311196	110	int config, i;
40089a9f GR	111
	112	mutex_lock(&data->update_lock);
	113
	114	if (time_after(jiffies, data->last_updated + HZ * 2) \|\| !data->valid) {
	115	dev_dbg(&client->dev, "Updating max1619 data.\n");
f8311196 GR	116	for (i = 0; i < t_num_regs; i++)
	117	data->temp[i] = i2c_smbus_read_byte_data(client,
	118	regs_read[i]);
40089a9f GR	119	data->alarms = i2c_smbus_read_byte_data(client,
	120	MAX1619_REG_R_STATUS);
	121	/* If OVERT polarity is low, reverse alarm bit */
	122	config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
	123	if (!(config & 0x20))
	124	data->alarms ^= 0x02;
	125
	126	data->last_updated = jiffies;
952a11ca	127	data->valid = true;
40089a9f GR	128	}
	129
	130	mutex_unlock(&data->update_lock);
	131
	132	return data;
	133	}
	134
1da177e4 LT	135	/*
	136	* Sysfs stuff
	137	*/
	138
21887303	139	static ssize_t temp_show(struct device dev, struct device_attribute devattr,
f8311196 GR	140	char *buf)
	141	{
	142	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	143	struct max1619_data *data = max1619_update_device(dev);
	144
	145	return sprintf(buf, "%d\n", temp_from_reg(data->temp[attr->index]));
1da177e4 LT	146	}
1da177e4 LT	147
21887303 GR	148	static ssize_t temp_store(struct device *dev,
	149	struct device_attribute devattr, const char buf,
	150	size_t count)
f8311196 GR	151	{
f8311196 GR	152	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
9f1513bd GR	153	struct max1619_data *data = dev_get_drvdata(dev);
9f1513bd GR	154	struct i2c_client *client = data->client;
f8311196 GR	155	long val;
	156	int err = kstrtol(buf, 10, &val);
	157	if (err)
	158	return err;
	159
	160	mutex_lock(&data->update_lock);
	161	data->temp[attr->index] = temp_to_reg(val);
	162	i2c_smbus_write_byte_data(client, regs_write[attr->index],
	163	data->temp[attr->index]);
	164	mutex_unlock(&data->update_lock);
	165	return count;
	166	}
1da177e4	167
23eb359d	168	static ssize_t alarms_show(struct device dev, struct device_attribute attr,
8958dfb7	169	char *buf)
1da177e4 LT	170	{
	171	struct max1619_data *data = max1619_update_device(dev);
	172	return sprintf(buf, "%d\n", data->alarms);
	173	}
	174
21887303	175	static ssize_t alarm_show(struct device dev, struct device_attribute attr,
71062ffc JD	176	char *buf)
	177	{
	178	int bitnr = to_sensor_dev_attr(attr)->index;
	179	struct max1619_data *data = max1619_update_device(dev);
	180	return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
	181	}
	182
21887303 GR	183	static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, t_input1);
	184	static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, t_input2);
	185	static SENSOR_DEVICE_ATTR_RW(temp2_min, temp, t_low2);
	186	static SENSOR_DEVICE_ATTR_RW(temp2_max, temp, t_high2);
	187	static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp, t_crit2);
	188	static SENSOR_DEVICE_ATTR_RW(temp2_crit_hyst, temp, t_hyst2);
f8311196	189
23eb359d	190	static DEVICE_ATTR_RO(alarms);
21887303 GR	191	static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 1);
	192	static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 2);
	193	static SENSOR_DEVICE_ATTR_RO(temp2_min_alarm, alarm, 3);
	194	static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 4);
1da177e4	195
9f1513bd	196	static struct attribute *max1619_attrs[] = {
f8311196 GR	197	&sensor_dev_attr_temp1_input.dev_attr.attr,
	198	&sensor_dev_attr_temp2_input.dev_attr.attr,
	199	&sensor_dev_attr_temp2_min.dev_attr.attr,
	200	&sensor_dev_attr_temp2_max.dev_attr.attr,
	201	&sensor_dev_attr_temp2_crit.dev_attr.attr,
	202	&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
a5ebe668 JD	203
a5ebe668 JD	204	&dev_attr_alarms.attr,
71062ffc JD	205	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	206	&sensor_dev_attr_temp2_fault.dev_attr.attr,
	207	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
	208	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
a5ebe668 JD	209	NULL
a5ebe668 JD	210	};
9f1513bd	211	ATTRIBUTE_GROUPS(max1619);
a5ebe668	212
c6d3f6fa	213	/* Return 0 if detection is successful, -ENODEV otherwise */
310ec792	214	static int max1619_detect(struct i2c_client *client,
c6d3f6fa	215	struct i2c_board_info *info)
1da177e4	216	{
52df6440 JD	217	struct i2c_adapter *adapter = client->adapter;
52df6440 JD	218	u8 reg_config, reg_convrate, reg_status, man_id, chip_id;
b0020e3f	219
1da177e4	220	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
c6d3f6fa	221	return -ENODEV;
1da177e4	222
52df6440 JD	223	/* detection */
	224	reg_config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
	225	reg_convrate = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONVRATE);
	226	reg_status = i2c_smbus_read_byte_data(client, MAX1619_REG_R_STATUS);
	227	if ((reg_config & 0x03) != 0x00
	228	\|\| reg_convrate > 0x07 \|\| (reg_status & 0x61) != 0x00) {
	229	dev_dbg(&adapter->dev, "MAX1619 detection failed at 0x%02x\n",
	230	client->addr);
	231	return -ENODEV;
1da177e4 LT	232	}
1da177e4 LT	233
52df6440 JD	234	/* identification */
	235	man_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_MAN_ID);
	236	chip_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CHIP_ID);
	237	if (man_id != 0x4D \|\| chip_id != 0x04) {
	238	dev_info(&adapter->dev,
	239	"Unsupported chip (man_id=0x%02X, chip_id=0x%02X).\n",
	240	man_id, chip_id);
	241	return -ENODEV;
b0020e3f	242	}
1da177e4	243
f2f394db	244	strscpy(info->type, "max1619", I2C_NAME_SIZE);
c6d3f6fa JD	245
	246	return 0;
	247	}
	248
40089a9f GR	249	static void max1619_init_client(struct i2c_client *client)
	250	{
	251	u8 config;
	252
	253	/*
	254	* Start the conversions.
	255	*/
	256	i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE,
	257	5); /* 2 Hz */
	258	config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
	259	if (config & 0x40)
	260	i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG,
	261	config & 0xBF); /* run */
	262	}
	263
67487038	264	static int max1619_probe(struct i2c_client *new_client)
c6d3f6fa JD	265	{
c6d3f6fa JD	266	struct max1619_data *data;
9f1513bd	267	struct device *hwmon_dev;
c6d3f6fa	268
215690a4 GR	269	data = devm_kzalloc(&new_client->dev, sizeof(struct max1619_data),
	270	GFP_KERNEL);
	271	if (!data)
	272	return -ENOMEM;
1da177e4	273
9f1513bd	274	data->client = new_client;
9a61bf63	275	mutex_init(&data->update_lock);
1da177e4	276
1da177e4 LT	277	/* Initialize the MAX1619 chip */
	278	max1619_init_client(new_client);
	279
9f1513bd GR	280	hwmon_dev = devm_hwmon_device_register_with_groups(&new_client->dev,
	281	new_client->name,
	282	data,
	283	max1619_groups);
	284	return PTR_ERR_OR_ZERO(hwmon_dev);
1da177e4 LT	285	}
1da177e4 LT	286
40089a9f	287	static const struct i2c_device_id max1619_id[] = {
d8a66f36	288	{ "max1619" },
40089a9f GR	289	{ }
	290	};
	291	MODULE_DEVICE_TABLE(i2c, max1619_id);
1da177e4	292
fd53f621 AT	293	#ifdef CONFIG_OF
	294	static const struct of_device_id max1619_of_match[] = {
	295	{ .compatible = "maxim,max1619", },
	296	{},
	297	};
	298
	299	MODULE_DEVICE_TABLE(of, max1619_of_match);
	300	#endif
	301
40089a9f GR	302	static struct i2c_driver max1619_driver = {
	303	.class = I2C_CLASS_HWMON,
	304	.driver = {
	305	.name = "max1619",
fd53f621	306	.of_match_table = of_match_ptr(max1619_of_match),
40089a9f	307	},
1975d167	308	.probe = max1619_probe,
40089a9f GR	309	.id_table = max1619_id,
	310	.detect = max1619_detect,
	311	.address_list = normal_i2c,
	312	};
1da177e4	313
f0967eea	314	module_i2c_driver(max1619_driver);
1da177e4	315
7c81c60f	316	MODULE_AUTHOR("Oleksij Rempel <bug-track@fisher-privat.net>, Jean Delvare <jdelvare@suse.de>");
1da177e4 LT	317	MODULE_DESCRIPTION("MAX1619 sensor driver");
1da177e4 LT	318	MODULE_LICENSE("GPL");