[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;
}

/*
 * Functions declaration
 */

static int max1619_probe(struct i2c_client *client,
			 const struct i2c_device_id *id);
static int max1619_detect(struct i2c_client *client,
			  struct i2c_board_info *info);
static void max1619_init_client(struct i2c_client *client);
static int max1619_remove(struct i2c_client *client);
static struct max1619_data *max1619_update_device(struct device *dev);

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

static const struct i2c_device_id max1619_id[] = {
	{ "max1619", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, max1619_id);

static struct i2c_driver max1619_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "max1619",
	},
	.probe		= max1619_probe,
	.remove		= max1619_remove,
	.id_table	= max1619_id,
	.detect		= max1619_detect,
	.address_list	= normal_i2c,
};

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

struct max1619_data {
	struct device *hwmon_dev;
	struct mutex update_lock;
	char valid; /* zero until following fields are valid */
	unsigned long last_updated; /* in jiffies */

	/* registers values */
	u8 temp_input1; /* local */
	u8 temp_input2, temp_low2, temp_high2; /* remote */
	u8 temp_crit2;
	u8 temp_hyst2;
	u8 alarms;
};

/*
 * Sysfs stuff
 */

#define show_temp(value) \
static ssize_t show_##value(struct device *dev, struct device_attribute *attr, \
			    char *buf) \
{ \
	struct max1619_data *data = max1619_update_device(dev); \
	return sprintf(buf, "%d\n", temp_from_reg(data->value)); \
}
show_temp(temp_input1);
show_temp(temp_input2);
show_temp(temp_low2);
show_temp(temp_high2);
show_temp(temp_crit2);
show_temp(temp_hyst2);

#define set_temp2(value, reg) \
static ssize_t set_##value(struct device *dev, struct device_attribute *attr, \
			   const char *buf, \
	size_t count) \
{ \
	struct i2c_client *client = to_i2c_client(dev); \
	struct max1619_data *data = i2c_get_clientdata(client); \
	long val; \
	int err = kstrtol(buf, 10, &val); \
	if (err) \
		return err; \
\
	mutex_lock(&data->update_lock); \
	data->value = temp_to_reg(val); \
	i2c_smbus_write_byte_data(client, reg, data->value); \
	mutex_unlock(&data->update_lock); \
	return count; \
}

set_temp2(temp_low2, MAX1619_REG_W_REMOTE_LOW);
set_temp2(temp_high2, MAX1619_REG_W_REMOTE_HIGH);
set_temp2(temp_crit2, MAX1619_REG_W_REMOTE_CRIT);
set_temp2(temp_hyst2, MAX1619_REG_W_TCRIT_HYST);

static ssize_t show_alarms(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 DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL);
static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_low2,
	set_temp_low2);
static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_high2,
	set_temp_high2);
static DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit2,
	set_temp_crit2);
static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp_hyst2,
	set_temp_hyst2);
static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
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_attributes[] = {
	&dev_attr_temp1_input.attr,
	&dev_attr_temp2_input.attr,
	&dev_attr_temp2_min.attr,
	&dev_attr_temp2_max.attr,
	&dev_attr_temp2_crit.attr,
	&dev_attr_temp2_crit_hyst.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
};

static const struct attribute_group max1619_group = {
	.attrs = max1619_attributes,
};

/*
 * Real code
 */

/* 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 int max1619_probe(struct i2c_client *new_client,
			 const struct i2c_device_id *id)
{
	struct max1619_data *data;
	int err;

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

	i2c_set_clientdata(new_client, data);
	mutex_init(&data->update_lock);

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

	/* Register sysfs hooks */
	err = sysfs_create_group(&new_client->dev.kobj, &max1619_group);
	if (err)
		return err;

	data->hwmon_dev = hwmon_device_register(&new_client->dev);
	if (IS_ERR(data->hwmon_dev)) {
		err = PTR_ERR(data->hwmon_dev);
		goto exit_remove_files;
	}

	return 0;

exit_remove_files:
	sysfs_remove_group(&new_client->dev.kobj, &max1619_group);
	return err;
}

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_remove(struct i2c_client *client)
{
	struct max1619_data *data = i2c_get_clientdata(client);

	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&client->dev.kobj, &max1619_group);

	return 0;
}

static struct max1619_data *max1619_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct max1619_data *data = i2c_get_clientdata(client);
	int config;

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
		dev_dbg(&client->dev, "Updating max1619 data.\n");
		data->temp_input1 = i2c_smbus_read_byte_data(client,
					MAX1619_REG_R_LOCAL_TEMP);
		data->temp_input2 = i2c_smbus_read_byte_data(client,
					MAX1619_REG_R_REMOTE_TEMP);
		data->temp_high2 = i2c_smbus_read_byte_data(client,
					MAX1619_REG_R_REMOTE_HIGH);
		data->temp_low2 = i2c_smbus_read_byte_data(client,
					MAX1619_REG_R_REMOTE_LOW);
		data->temp_crit2 = i2c_smbus_read_byte_data(client,
					MAX1619_REG_R_REMOTE_CRIT);
		data->temp_hyst2 = i2c_smbus_read_byte_data(client,
					MAX1619_REG_R_TCRIT_HYST);
		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;
}

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 LT	73
	74	/*
	75	* Functions declaration
	76	*/
	77
c6d3f6fa JD	78	static int max1619_probe(struct i2c_client *client,
c6d3f6fa JD	79	const struct i2c_device_id *id);
310ec792	80	static int max1619_detect(struct i2c_client *client,
c6d3f6fa	81	struct i2c_board_info *info);
1da177e4	82	static void max1619_init_client(struct i2c_client *client);
c6d3f6fa	83	static int max1619_remove(struct i2c_client *client);
1da177e4 LT	84	static struct max1619_data max1619_update_device(struct device dev);
	85
	86	/*
	87	* Driver data (common to all clients)
	88	*/
	89
c6d3f6fa	90	static const struct i2c_device_id max1619_id[] = {
1f86df49	91	{ "max1619", 0 },
c6d3f6fa JD	92	{ }
	93	};
	94	MODULE_DEVICE_TABLE(i2c, max1619_id);
	95
1da177e4	96	static struct i2c_driver max1619_driver = {
c6d3f6fa	97	.class = I2C_CLASS_HWMON,
cdaf7934	98	.driver = {
cdaf7934 LR	99	.name = "max1619",
cdaf7934 LR	100	},
c6d3f6fa JD	101	.probe = max1619_probe,
	102	.remove = max1619_remove,
	103	.id_table = max1619_id,
	104	.detect = max1619_detect,
c3813d6a	105	.address_list = normal_i2c,
1da177e4 LT	106	};
	107
	108	/*
	109	* Client data (each client gets its own)
	110	*/
	111
	112	struct max1619_data {
1beeffe4	113	struct device *hwmon_dev;
9a61bf63	114	struct mutex update_lock;
1da177e4 LT	115	char valid; /* zero until following fields are valid */
	116	unsigned long last_updated; /* in jiffies */
	117
	118	/* registers values */
	119	u8 temp_input1; /* local */
	120	u8 temp_input2, temp_low2, temp_high2; /* remote */
	121	u8 temp_crit2;
	122	u8 temp_hyst2;
8958dfb7	123	u8 alarms;
1da177e4 LT	124	};
	125
	126	/*
	127	* Sysfs stuff
	128	*/
	129
	130	#define show_temp(value) \
8958dfb7 GR	131	static ssize_t show_##value(struct device dev, struct device_attribute attr, \
8958dfb7 GR	132	char *buf) \
1da177e4 LT	133	{ \
1da177e4 LT	134	struct max1619_data *data = max1619_update_device(dev); \
a80e8ee6	135	return sprintf(buf, "%d\n", temp_from_reg(data->value)); \
1da177e4 LT	136	}
	137	show_temp(temp_input1);
	138	show_temp(temp_input2);
	139	show_temp(temp_low2);
	140	show_temp(temp_high2);
	141	show_temp(temp_crit2);
	142	show_temp(temp_hyst2);
	143
	144	#define set_temp2(value, reg) \
8958dfb7 GR	145	static ssize_t set_##value(struct device dev, struct device_attribute attr, \
8958dfb7 GR	146	const char *buf, \
1da177e4 LT	147	size_t count) \
	148	{ \
	149	struct i2c_client *client = to_i2c_client(dev); \
	150	struct max1619_data *data = i2c_get_clientdata(client); \
8958dfb7 GR	151	long val; \
	152	int err = kstrtol(buf, 10, &val); \
	153	if (err) \
	154	return err; \
	155	\
9a61bf63	156	mutex_lock(&data->update_lock); \
a80e8ee6	157	data->value = temp_to_reg(val); \
1da177e4	158	i2c_smbus_write_byte_data(client, reg, data->value); \
9a61bf63	159	mutex_unlock(&data->update_lock); \
1da177e4 LT	160	return count; \
	161	}
	162
	163	set_temp2(temp_low2, MAX1619_REG_W_REMOTE_LOW);
	164	set_temp2(temp_high2, MAX1619_REG_W_REMOTE_HIGH);
	165	set_temp2(temp_crit2, MAX1619_REG_W_REMOTE_CRIT);
	166	set_temp2(temp_hyst2, MAX1619_REG_W_TCRIT_HYST);
	167
8958dfb7 GR	168	static ssize_t show_alarms(struct device dev, struct device_attribute attr,
8958dfb7 GR	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
71062ffc JD	175	static ssize_t show_alarm(struct device dev, struct device_attribute attr,
	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
1da177e4 LT	183	static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
	184	static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL);
	185	static DEVICE_ATTR(temp2_min, S_IWUSR \| S_IRUGO, show_temp_low2,
	186	set_temp_low2);
	187	static DEVICE_ATTR(temp2_max, S_IWUSR \| S_IRUGO, show_temp_high2,
	188	set_temp_high2);
	189	static DEVICE_ATTR(temp2_crit, S_IWUSR \| S_IRUGO, show_temp_crit2,
	190	set_temp_crit2);
	191	static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR \| S_IRUGO, show_temp_hyst2,
	192	set_temp_hyst2);
	193	static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
71062ffc JD	194	static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
	195	static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
	196	static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
	197	static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
1da177e4	198
a5ebe668 JD	199	static struct attribute *max1619_attributes[] = {
	200	&dev_attr_temp1_input.attr,
	201	&dev_attr_temp2_input.attr,
	202	&dev_attr_temp2_min.attr,
	203	&dev_attr_temp2_max.attr,
	204	&dev_attr_temp2_crit.attr,
	205	&dev_attr_temp2_crit_hyst.attr,
	206
	207	&dev_attr_alarms.attr,
71062ffc JD	208	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	209	&sensor_dev_attr_temp2_fault.dev_attr.attr,
	210	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
	211	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
a5ebe668 JD	212	NULL
	213	};
	214
	215	static const struct attribute_group max1619_group = {
	216	.attrs = max1619_attributes,
	217	};
	218
1da177e4 LT	219	/*
	220	* Real code
	221	*/
	222
c6d3f6fa	223	/* Return 0 if detection is successful, -ENODEV otherwise */
310ec792	224	static int max1619_detect(struct i2c_client *client,
c6d3f6fa	225	struct i2c_board_info *info)
1da177e4	226	{
52df6440 JD	227	struct i2c_adapter *adapter = client->adapter;
52df6440 JD	228	u8 reg_config, reg_convrate, reg_status, man_id, chip_id;
b0020e3f	229
1da177e4	230	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
c6d3f6fa	231	return -ENODEV;
1da177e4	232
52df6440 JD	233	/* detection */
	234	reg_config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
	235	reg_convrate = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONVRATE);
	236	reg_status = i2c_smbus_read_byte_data(client, MAX1619_REG_R_STATUS);
	237	if ((reg_config & 0x03) != 0x00
	238	\|\| reg_convrate > 0x07 \|\| (reg_status & 0x61) != 0x00) {
	239	dev_dbg(&adapter->dev, "MAX1619 detection failed at 0x%02x\n",
	240	client->addr);
	241	return -ENODEV;
1da177e4 LT	242	}
1da177e4 LT	243
52df6440 JD	244	/* identification */
	245	man_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_MAN_ID);
	246	chip_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CHIP_ID);
	247	if (man_id != 0x4D \|\| chip_id != 0x04) {
	248	dev_info(&adapter->dev,
	249	"Unsupported chip (man_id=0x%02X, chip_id=0x%02X).\n",
	250	man_id, chip_id);
	251	return -ENODEV;
b0020e3f	252	}
1da177e4	253
c6d3f6fa JD	254	strlcpy(info->type, "max1619", I2C_NAME_SIZE);
	255
	256	return 0;
	257	}
	258
	259	static int max1619_probe(struct i2c_client *new_client,
	260	const struct i2c_device_id *id)
	261	{
	262	struct max1619_data *data;
	263	int err;
	264
215690a4 GR	265	data = devm_kzalloc(&new_client->dev, sizeof(struct max1619_data),
	266	GFP_KERNEL);
	267	if (!data)
	268	return -ENOMEM;
1da177e4	269
c6d3f6fa	270	i2c_set_clientdata(new_client, data);
9a61bf63	271	mutex_init(&data->update_lock);
1da177e4	272
1da177e4 LT	273	/* Initialize the MAX1619 chip */
	274	max1619_init_client(new_client);
	275
	276	/* Register sysfs hooks */
8958dfb7 GR	277	err = sysfs_create_group(&new_client->dev.kobj, &max1619_group);
8958dfb7 GR	278	if (err)
215690a4	279	return err;
a5ebe668	280
1beeffe4 TJ	281	data->hwmon_dev = hwmon_device_register(&new_client->dev);
	282	if (IS_ERR(data->hwmon_dev)) {
	283	err = PTR_ERR(data->hwmon_dev);
a5ebe668	284	goto exit_remove_files;
943b0830 MH	285	}
943b0830 MH	286
1da177e4 LT	287	return 0;
1da177e4 LT	288
a5ebe668 JD	289	exit_remove_files:
a5ebe668 JD	290	sysfs_remove_group(&new_client->dev.kobj, &max1619_group);
1da177e4 LT	291	return err;
	292	}
	293
	294	static void max1619_init_client(struct i2c_client *client)
	295	{
	296	u8 config;
	297
	298	/*
	299	* Start the conversions.
	300	*/
	301	i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE,
	302	5); /* 2 Hz */
	303	config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
	304	if (config & 0x40)
	305	i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG,
	306	config & 0xBF); /* run */
	307	}
	308
c6d3f6fa	309	static int max1619_remove(struct i2c_client *client)
1da177e4	310	{
943b0830	311	struct max1619_data *data = i2c_get_clientdata(client);
1da177e4	312
1beeffe4	313	hwmon_device_unregister(data->hwmon_dev);
a5ebe668	314	sysfs_remove_group(&client->dev.kobj, &max1619_group);
943b0830	315
1da177e4 LT	316	return 0;
	317	}
	318
	319	static struct max1619_data max1619_update_device(struct device dev)
	320	{
	321	struct i2c_client *client = to_i2c_client(dev);
	322	struct max1619_data *data = i2c_get_clientdata(client);
628c6d27	323	int config;
1da177e4	324
9a61bf63	325	mutex_lock(&data->update_lock);
1da177e4 LT	326
	327	if (time_after(jiffies, data->last_updated + HZ * 2) \|\| !data->valid) {
	328	dev_dbg(&client->dev, "Updating max1619 data.\n");
	329	data->temp_input1 = i2c_smbus_read_byte_data(client,
	330	MAX1619_REG_R_LOCAL_TEMP);
	331	data->temp_input2 = i2c_smbus_read_byte_data(client,
	332	MAX1619_REG_R_REMOTE_TEMP);
	333	data->temp_high2 = i2c_smbus_read_byte_data(client,
	334	MAX1619_REG_R_REMOTE_HIGH);
	335	data->temp_low2 = i2c_smbus_read_byte_data(client,
	336	MAX1619_REG_R_REMOTE_LOW);
	337	data->temp_crit2 = i2c_smbus_read_byte_data(client,
	338	MAX1619_REG_R_REMOTE_CRIT);
	339	data->temp_hyst2 = i2c_smbus_read_byte_data(client,
	340	MAX1619_REG_R_TCRIT_HYST);
	341	data->alarms = i2c_smbus_read_byte_data(client,
	342	MAX1619_REG_R_STATUS);
628c6d27 GR	343	/* If OVERT polarity is low, reverse alarm bit */
	344	config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
	345	if (!(config & 0x20))
	346	data->alarms ^= 0x02;
1da177e4 LT	347
	348	data->last_updated = jiffies;
	349	data->valid = 1;
	350	}
	351
9a61bf63	352	mutex_unlock(&data->update_lock);
1da177e4 LT	353
	354	return data;
	355	}
	356
f0967eea	357	module_i2c_driver(max1619_driver);
1da177e4	358
7c81c60f	359	MODULE_AUTHOR("Oleksij Rempel <bug-track@fisher-privat.net>, Jean Delvare <jdelvare@suse.de>");
1da177e4 LT	360	MODULE_DESCRIPTION("MAX1619 sensor driver");
1da177e4 LT	361	MODULE_LICENSE("GPL");