[mirror_ubuntu-bionic-kernel.git] / drivers / hwmon / max1619.c

/*
 * 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
 *
 * 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/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;
	char valid; /* zero 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 = 1;
	}

	mutex_unlock(&data->update_lock);

	return data;
}

/*
 * Sysfs stuff
 */

static ssize_t show_temp(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 set_temp(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 show_alarm(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(temp1_input, S_IRUGO, show_temp, NULL, t_input1);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, t_input2);
static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp, set_temp,
			  t_low2);
static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp, set_temp,
			  t_high2);
static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp, set_temp,
			  t_crit2);
static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp,
			  set_temp, t_hyst2);

static DEVICE_ATTR_RO(alarms);
static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 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;
	}

	strlcpy(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,
			 const struct i2c_device_id *id)
{
	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", 0 },
	{ }
};
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
1da177e4 LT	1	/*
	2	* max1619.c - Part of lm_sensors, Linux kernel modules for hardware
	3	* monitoring
9292f055	4	* Copyright (C) 2003-2004 Oleksij Rempel <bug-track@fisher-privat.net>
7c81c60f	5	* Jean Delvare <jdelvare@suse.de>
1da177e4 LT	6	*
	7	* Based on the lm90 driver. The MAX1619 is a sensor chip made by Maxim.
	8	* It reports up to two temperatures (its own plus up to
	9	* one external one). Complete datasheet can be
	10	* obtained from Maxim's website at:
	11	* http://pdfserv.maxim-ic.com/en/ds/MAX1619.pdf
	12	*
	13	* This program is free software; you can redistribute it and/or modify
	14	* it under the terms of the GNU General Public License as published by
	15	* the Free Software Foundation; either version 2 of the License, or
	16	* (at your option) any later version.
	17	*
	18	* This program is distributed in the hope that it will be useful,
	19	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	20	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	21	* GNU General Public License for more details.
1da177e4 LT	22	*/
1da177e4 LT	23
1da177e4 LT	24	#include <linux/module.h>
	25	#include <linux/init.h>
	26	#include <linux/slab.h>
	27	#include <linux/jiffies.h>
	28	#include <linux/i2c.h>
943b0830	29	#include <linux/hwmon.h>
71062ffc	30	#include <linux/hwmon-sysfs.h>
943b0830	31	#include <linux/err.h>
9a61bf63	32	#include <linux/mutex.h>
a5ebe668	33	#include <linux/sysfs.h>
1da177e4	34
25e9c86d MH	35	static const unsigned short normal_i2c[] = {
25e9c86d MH	36	0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
1da177e4	37
1da177e4 LT	38	/*
	39	* The MAX1619 registers
	40	*/
	41
	42	#define MAX1619_REG_R_MAN_ID 0xFE
	43	#define MAX1619_REG_R_CHIP_ID 0xFF
	44	#define MAX1619_REG_R_CONFIG 0x03
	45	#define MAX1619_REG_W_CONFIG 0x09
	46	#define MAX1619_REG_R_CONVRATE 0x04
	47	#define MAX1619_REG_W_CONVRATE 0x0A
	48	#define MAX1619_REG_R_STATUS 0x02
	49	#define MAX1619_REG_R_LOCAL_TEMP 0x00
	50	#define MAX1619_REG_R_REMOTE_TEMP 0x01
	51	#define MAX1619_REG_R_REMOTE_HIGH 0x07
	52	#define MAX1619_REG_W_REMOTE_HIGH 0x0D
	53	#define MAX1619_REG_R_REMOTE_LOW 0x08
	54	#define MAX1619_REG_W_REMOTE_LOW 0x0E
	55	#define MAX1619_REG_R_REMOTE_CRIT 0x10
	56	#define MAX1619_REG_W_REMOTE_CRIT 0x12
	57	#define MAX1619_REG_R_TCRIT_HYST 0x11
	58	#define MAX1619_REG_W_TCRIT_HYST 0x13
	59
	60	/*
a80e8ee6	61	* Conversions
1da177e4 LT	62	*/
1da177e4 LT	63
a80e8ee6 AM	64	static int temp_from_reg(int val)
	65	{
	66	return (val & 0x80 ? val-0x100 : val) * 1000;
	67	}
	68
	69	static int temp_to_reg(int val)
	70	{
	71	return (val < 0 ? val+0x100*1000 : val) / 1000;
	72	}
1da177e4	73
f8311196 GR	74	enum temp_index {
	75	t_input1 = 0,
	76	t_input2,
	77	t_low2,
	78	t_high2,
	79	t_crit2,
	80	t_hyst2,
	81	t_num_regs
	82	};
	83
1da177e4 LT	84	/*
	85	* Client data (each client gets its own)
	86	*/
	87
	88	struct max1619_data {
9f1513bd	89	struct i2c_client *client;
9a61bf63	90	struct mutex update_lock;
1da177e4 LT	91	char valid; /* zero until following fields are valid */
	92	unsigned long last_updated; /* in jiffies */
	93
	94	/* registers values */
f8311196	95	u8 temp[t_num_regs]; /* index with enum temp_index */
8958dfb7	96	u8 alarms;
1da177e4 LT	97	};
1da177e4 LT	98
f8311196 GR	99	static const u8 regs_read[t_num_regs] = {
	100	[t_input1] = MAX1619_REG_R_LOCAL_TEMP,
	101	[t_input2] = MAX1619_REG_R_REMOTE_TEMP,
	102	[t_low2] = MAX1619_REG_R_REMOTE_LOW,
	103	[t_high2] = MAX1619_REG_R_REMOTE_HIGH,
	104	[t_crit2] = MAX1619_REG_R_REMOTE_CRIT,
	105	[t_hyst2] = MAX1619_REG_R_TCRIT_HYST,
	106	};
	107
	108	static const u8 regs_write[t_num_regs] = {
	109	[t_low2] = MAX1619_REG_W_REMOTE_LOW,
	110	[t_high2] = MAX1619_REG_W_REMOTE_HIGH,
	111	[t_crit2] = MAX1619_REG_W_REMOTE_CRIT,
	112	[t_hyst2] = MAX1619_REG_W_TCRIT_HYST,
	113	};
	114
40089a9f GR	115	static struct max1619_data max1619_update_device(struct device dev)
40089a9f GR	116	{
9f1513bd GR	117	struct max1619_data *data = dev_get_drvdata(dev);
9f1513bd GR	118	struct i2c_client *client = data->client;
f8311196	119	int config, i;
40089a9f GR	120
	121	mutex_lock(&data->update_lock);
	122
	123	if (time_after(jiffies, data->last_updated + HZ * 2) \|\| !data->valid) {
	124	dev_dbg(&client->dev, "Updating max1619 data.\n");
f8311196 GR	125	for (i = 0; i < t_num_regs; i++)
	126	data->temp[i] = i2c_smbus_read_byte_data(client,
	127	regs_read[i]);
40089a9f GR	128	data->alarms = i2c_smbus_read_byte_data(client,
	129	MAX1619_REG_R_STATUS);
	130	/* If OVERT polarity is low, reverse alarm bit */
	131	config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
	132	if (!(config & 0x20))
	133	data->alarms ^= 0x02;
	134
	135	data->last_updated = jiffies;
	136	data->valid = 1;
	137	}
	138
	139	mutex_unlock(&data->update_lock);
	140
	141	return data;
	142	}
	143
1da177e4 LT	144	/*
	145	* Sysfs stuff
	146	*/
	147
f8311196 GR	148	static ssize_t show_temp(struct device dev, struct device_attribute devattr,
	149	char *buf)
	150	{
	151	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	152	struct max1619_data *data = max1619_update_device(dev);
	153
	154	return sprintf(buf, "%d\n", temp_from_reg(data->temp[attr->index]));
1da177e4 LT	155	}
1da177e4 LT	156
f8311196 GR	157	static ssize_t set_temp(struct device dev, struct device_attribute devattr,
	158	const char *buf, size_t count)
	159	{
	160	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
9f1513bd GR	161	struct max1619_data *data = dev_get_drvdata(dev);
9f1513bd GR	162	struct i2c_client *client = data->client;
f8311196 GR	163	long val;
	164	int err = kstrtol(buf, 10, &val);
	165	if (err)
	166	return err;
	167
	168	mutex_lock(&data->update_lock);
	169	data->temp[attr->index] = temp_to_reg(val);
	170	i2c_smbus_write_byte_data(client, regs_write[attr->index],
	171	data->temp[attr->index]);
	172	mutex_unlock(&data->update_lock);
	173	return count;
	174	}
1da177e4	175
23eb359d	176	static ssize_t alarms_show(struct device dev, struct device_attribute attr,
8958dfb7	177	char *buf)
1da177e4 LT	178	{
	179	struct max1619_data *data = max1619_update_device(dev);
	180	return sprintf(buf, "%d\n", data->alarms);
	181	}
	182
71062ffc JD	183	static ssize_t show_alarm(struct device dev, struct device_attribute attr,
	184	char *buf)
	185	{
	186	int bitnr = to_sensor_dev_attr(attr)->index;
	187	struct max1619_data *data = max1619_update_device(dev);
	188	return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
	189	}
	190
f8311196 GR	191	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, t_input1);
	192	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, t_input2);
	193	static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR \| S_IRUGO, show_temp, set_temp,
	194	t_low2);
	195	static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR \| S_IRUGO, show_temp, set_temp,
	196	t_high2);
	197	static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR \| S_IRUGO, show_temp, set_temp,
	198	t_crit2);
	199	static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IWUSR \| S_IRUGO, show_temp,
	200	set_temp, t_hyst2);
	201
23eb359d	202	static DEVICE_ATTR_RO(alarms);
71062ffc JD	203	static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
	204	static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
	205	static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
	206	static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
1da177e4	207
9f1513bd	208	static struct attribute *max1619_attrs[] = {
f8311196 GR	209	&sensor_dev_attr_temp1_input.dev_attr.attr,
	210	&sensor_dev_attr_temp2_input.dev_attr.attr,
	211	&sensor_dev_attr_temp2_min.dev_attr.attr,
	212	&sensor_dev_attr_temp2_max.dev_attr.attr,
	213	&sensor_dev_attr_temp2_crit.dev_attr.attr,
	214	&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
a5ebe668 JD	215
a5ebe668 JD	216	&dev_attr_alarms.attr,
71062ffc JD	217	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	218	&sensor_dev_attr_temp2_fault.dev_attr.attr,
	219	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
	220	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
a5ebe668 JD	221	NULL
a5ebe668 JD	222	};
9f1513bd	223	ATTRIBUTE_GROUPS(max1619);
a5ebe668	224
c6d3f6fa	225	/* Return 0 if detection is successful, -ENODEV otherwise */
310ec792	226	static int max1619_detect(struct i2c_client *client,
c6d3f6fa	227	struct i2c_board_info *info)
1da177e4	228	{
52df6440 JD	229	struct i2c_adapter *adapter = client->adapter;
52df6440 JD	230	u8 reg_config, reg_convrate, reg_status, man_id, chip_id;
b0020e3f	231
1da177e4	232	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
c6d3f6fa	233	return -ENODEV;
1da177e4	234
52df6440 JD	235	/* detection */
	236	reg_config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
	237	reg_convrate = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONVRATE);
	238	reg_status = i2c_smbus_read_byte_data(client, MAX1619_REG_R_STATUS);
	239	if ((reg_config & 0x03) != 0x00
	240	\|\| reg_convrate > 0x07 \|\| (reg_status & 0x61) != 0x00) {
	241	dev_dbg(&adapter->dev, "MAX1619 detection failed at 0x%02x\n",
	242	client->addr);
	243	return -ENODEV;
1da177e4 LT	244	}
1da177e4 LT	245
52df6440 JD	246	/* identification */
	247	man_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_MAN_ID);
	248	chip_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CHIP_ID);
	249	if (man_id != 0x4D \|\| chip_id != 0x04) {
	250	dev_info(&adapter->dev,
	251	"Unsupported chip (man_id=0x%02X, chip_id=0x%02X).\n",
	252	man_id, chip_id);
	253	return -ENODEV;
b0020e3f	254	}
1da177e4	255
c6d3f6fa JD	256	strlcpy(info->type, "max1619", I2C_NAME_SIZE);
	257
	258	return 0;
	259	}
	260
40089a9f GR	261	static void max1619_init_client(struct i2c_client *client)
	262	{
	263	u8 config;
	264
	265	/*
	266	* Start the conversions.
	267	*/
	268	i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE,
	269	5); /* 2 Hz */
	270	config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
	271	if (config & 0x40)
	272	i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG,
	273	config & 0xBF); /* run */
	274	}
	275
c6d3f6fa JD	276	static int max1619_probe(struct i2c_client *new_client,
	277	const struct i2c_device_id *id)
	278	{
	279	struct max1619_data *data;
9f1513bd	280	struct device *hwmon_dev;
c6d3f6fa	281
215690a4 GR	282	data = devm_kzalloc(&new_client->dev, sizeof(struct max1619_data),
	283	GFP_KERNEL);
	284	if (!data)
	285	return -ENOMEM;
1da177e4	286
9f1513bd	287	data->client = new_client;
9a61bf63	288	mutex_init(&data->update_lock);
1da177e4	289
1da177e4 LT	290	/* Initialize the MAX1619 chip */
	291	max1619_init_client(new_client);
	292
9f1513bd GR	293	hwmon_dev = devm_hwmon_device_register_with_groups(&new_client->dev,
	294	new_client->name,
	295	data,
	296	max1619_groups);
	297	return PTR_ERR_OR_ZERO(hwmon_dev);
1da177e4 LT	298	}
1da177e4 LT	299
40089a9f GR	300	static const struct i2c_device_id max1619_id[] = {
	301	{ "max1619", 0 },
	302	{ }
	303	};
	304	MODULE_DEVICE_TABLE(i2c, max1619_id);
1da177e4	305
fd53f621 AT	306	#ifdef CONFIG_OF
	307	static const struct of_device_id max1619_of_match[] = {
	308	{ .compatible = "maxim,max1619", },
	309	{},
	310	};
	311
	312	MODULE_DEVICE_TABLE(of, max1619_of_match);
	313	#endif
	314
40089a9f GR	315	static struct i2c_driver max1619_driver = {
	316	.class = I2C_CLASS_HWMON,
	317	.driver = {
	318	.name = "max1619",
fd53f621	319	.of_match_table = of_match_ptr(max1619_of_match),
40089a9f GR	320	},
40089a9f GR	321	.probe = max1619_probe,
40089a9f GR	322	.id_table = max1619_id,
	323	.detect = max1619_detect,
	324	.address_list = normal_i2c,
	325	};
1da177e4	326
f0967eea	327	module_i2c_driver(max1619_driver);
1da177e4	328
7c81c60f	329	MODULE_AUTHOR("Oleksij Rempel <bug-track@fisher-privat.net>, Jean Delvare <jdelvare@suse.de>");
1da177e4 LT	330	MODULE_DESCRIPTION("MAX1619 sensor driver");
1da177e4 LT	331	MODULE_LICENSE("GPL");