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

/*
 * max1619.c - Part of lm_sensors, Linux kernel modules for hardware
 *             monitoring
 * Copyright (C) 2003-2004 Alexey Fisher <fishor@mail.ru>
 *                         Jean Delvare <khali@linux-fr.org>
 *
 * 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.
 *
 * 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[] = {
	0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };

/*
 * Insmod parameters
 */

I2C_CLIENT_INSMOD_1(max1619);

/*
 * 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, int kind,
			  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", max1619 },
	{ }
};
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_data	= &addr_data,
};

/*
 * 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 = simple_strtol(buf, NULL, 10); \
 \
	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 *new_client, int kind,
			  struct i2c_board_info *info)
{
	struct i2c_adapter *adapter = new_client->adapter;
	u8 reg_config=0, reg_convrate=0, reg_status=0;

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

	/*
	 * Now we do the remaining detection. A negative kind means that
	 * the driver was loaded with no force parameter (default), so we
	 * must both detect and identify the chip. A zero kind means that
	 * the driver was loaded with the force parameter, the detection
	 * step shall be skipped. A positive kind means that the driver
	 * was loaded with the force parameter and a given kind of chip is
	 * requested, so both the detection and the identification steps
	 * are skipped.
	 */
	if (kind < 0) { /* detection */
		reg_config = i2c_smbus_read_byte_data(new_client,
			      MAX1619_REG_R_CONFIG);
		reg_convrate = i2c_smbus_read_byte_data(new_client,
			       MAX1619_REG_R_CONVRATE);
		reg_status = i2c_smbus_read_byte_data(new_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",
				new_client->addr);
			return -ENODEV;
		}
	}

	if (kind <= 0) { /* identification */
		u8 man_id, chip_id;
	
		man_id = i2c_smbus_read_byte_data(new_client,
			 MAX1619_REG_R_MAN_ID);
		chip_id = i2c_smbus_read_byte_data(new_client,
			  MAX1619_REG_R_CHIP_ID);
		
		if ((man_id == 0x4D) && (chip_id == 0x04))
			kind = max1619;

		if (kind <= 0) { /* identification failed */
			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 = kzalloc(sizeof(struct max1619_data), GFP_KERNEL);
	if (!data) {
		err = -ENOMEM;
		goto exit;
	}

	i2c_set_clientdata(new_client, data);
	data->valid = 0;
	mutex_init(&data->update_lock);

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

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

	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);
exit_free:
	kfree(data);
exit:
	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);

	kfree(data);
	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);

	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);

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

	mutex_unlock(&data->update_lock);

	return data;
}

static int __init sensors_max1619_init(void)
{
	return i2c_add_driver(&max1619_driver);
}

static void __exit sensors_max1619_exit(void)
{
	i2c_del_driver(&max1619_driver);
}

MODULE_AUTHOR("Alexey Fisher <fishor@mail.ru> and "
	"Jean Delvare <khali@linux-fr.org>");
MODULE_DESCRIPTION("MAX1619 sensor driver");
MODULE_LICENSE("GPL");

module_init(sensors_max1619_init);
module_exit(sensors_max1619_exit);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* max1619.c - Part of lm_sensors, Linux kernel modules for hardware
	3	* monitoring
	4	* Copyright (C) 2003-2004 Alexey Fisher <fishor@mail.ru>
	5	* Jean Delvare <khali@linux-fr.org>
	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.
	22	*
	23	* You should have received a copy of the GNU General Public License
	24	* along with this program; if not, write to the Free Software
	25	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	26	*/
	27
	28
1da177e4 LT	29	#include <linux/module.h>
	30	#include <linux/init.h>
	31	#include <linux/slab.h>
	32	#include <linux/jiffies.h>
	33	#include <linux/i2c.h>
943b0830	34	#include <linux/hwmon.h>
71062ffc	35	#include <linux/hwmon-sysfs.h>
943b0830	36	#include <linux/err.h>
9a61bf63	37	#include <linux/mutex.h>
a5ebe668	38	#include <linux/sysfs.h>
1da177e4	39
25e9c86d MH	40	static const unsigned short normal_i2c[] = {
25e9c86d MH	41	0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
1da177e4 LT	42
	43	/*
	44	* Insmod parameters
	45	*/
	46
f4b50261	47	I2C_CLIENT_INSMOD_1(max1619);
1da177e4 LT	48
	49	/*
	50	* The MAX1619 registers
	51	*/
	52
	53	#define MAX1619_REG_R_MAN_ID 0xFE
	54	#define MAX1619_REG_R_CHIP_ID 0xFF
	55	#define MAX1619_REG_R_CONFIG 0x03
	56	#define MAX1619_REG_W_CONFIG 0x09
	57	#define MAX1619_REG_R_CONVRATE 0x04
	58	#define MAX1619_REG_W_CONVRATE 0x0A
	59	#define MAX1619_REG_R_STATUS 0x02
	60	#define MAX1619_REG_R_LOCAL_TEMP 0x00
	61	#define MAX1619_REG_R_REMOTE_TEMP 0x01
	62	#define MAX1619_REG_R_REMOTE_HIGH 0x07
	63	#define MAX1619_REG_W_REMOTE_HIGH 0x0D
	64	#define MAX1619_REG_R_REMOTE_LOW 0x08
	65	#define MAX1619_REG_W_REMOTE_LOW 0x0E
	66	#define MAX1619_REG_R_REMOTE_CRIT 0x10
	67	#define MAX1619_REG_W_REMOTE_CRIT 0x12
	68	#define MAX1619_REG_R_TCRIT_HYST 0x11
	69	#define MAX1619_REG_W_TCRIT_HYST 0x13
	70
	71	/*
a80e8ee6	72	* Conversions
1da177e4 LT	73	*/
1da177e4 LT	74
a80e8ee6 AM	75	static int temp_from_reg(int val)
	76	{
	77	return (val & 0x80 ? val-0x100 : val) * 1000;
	78	}
	79
	80	static int temp_to_reg(int val)
	81	{
	82	return (val < 0 ? val+0x100*1000 : val) / 1000;
	83	}
1da177e4 LT	84
	85	/*
	86	* Functions declaration
	87	*/
	88
c6d3f6fa JD	89	static int max1619_probe(struct i2c_client *client,
	90	const struct i2c_device_id *id);
	91	static int max1619_detect(struct i2c_client *client, int kind,
	92	struct i2c_board_info *info);
1da177e4	93	static void max1619_init_client(struct i2c_client *client);
c6d3f6fa	94	static int max1619_remove(struct i2c_client *client);
1da177e4 LT	95	static struct max1619_data max1619_update_device(struct device dev);
	96
	97	/*
	98	* Driver data (common to all clients)
	99	*/
	100
c6d3f6fa JD	101	static const struct i2c_device_id max1619_id[] = {
	102	{ "max1619", max1619 },
	103	{ }
	104	};
	105	MODULE_DEVICE_TABLE(i2c, max1619_id);
	106
1da177e4	107	static struct i2c_driver max1619_driver = {
c6d3f6fa	108	.class = I2C_CLASS_HWMON,
cdaf7934	109	.driver = {
cdaf7934 LR	110	.name = "max1619",
cdaf7934 LR	111	},
c6d3f6fa JD	112	.probe = max1619_probe,
	113	.remove = max1619_remove,
	114	.id_table = max1619_id,
	115	.detect = max1619_detect,
	116	.address_data = &addr_data,
1da177e4 LT	117	};
	118
	119	/*
	120	* Client data (each client gets its own)
	121	*/
	122
	123	struct max1619_data {
1beeffe4	124	struct device *hwmon_dev;
9a61bf63	125	struct mutex update_lock;
1da177e4 LT	126	char valid; /* zero until following fields are valid */
	127	unsigned long last_updated; /* in jiffies */
	128
	129	/* registers values */
	130	u8 temp_input1; /* local */
	131	u8 temp_input2, temp_low2, temp_high2; /* remote */
	132	u8 temp_crit2;
	133	u8 temp_hyst2;
	134	u8 alarms;
	135	};
	136
	137	/*
	138	* Sysfs stuff
	139	*/
	140
	141	#define show_temp(value) \
8627f9ba	142	static ssize_t show_##value(struct device dev, struct device_attribute attr, char *buf) \
1da177e4 LT	143	{ \
1da177e4 LT	144	struct max1619_data *data = max1619_update_device(dev); \
a80e8ee6	145	return sprintf(buf, "%d\n", temp_from_reg(data->value)); \
1da177e4 LT	146	}
	147	show_temp(temp_input1);
	148	show_temp(temp_input2);
	149	show_temp(temp_low2);
	150	show_temp(temp_high2);
	151	show_temp(temp_crit2);
	152	show_temp(temp_hyst2);
	153
	154	#define set_temp2(value, reg) \
8627f9ba	155	static ssize_t set_##value(struct device dev, struct device_attribute attr, const char *buf, \
1da177e4 LT	156	size_t count) \
	157	{ \
	158	struct i2c_client *client = to_i2c_client(dev); \
	159	struct max1619_data *data = i2c_get_clientdata(client); \
	160	long val = simple_strtol(buf, NULL, 10); \
	161	\
9a61bf63	162	mutex_lock(&data->update_lock); \
a80e8ee6	163	data->value = temp_to_reg(val); \
1da177e4	164	i2c_smbus_write_byte_data(client, reg, data->value); \
9a61bf63	165	mutex_unlock(&data->update_lock); \
1da177e4 LT	166	return count; \
	167	}
	168
	169	set_temp2(temp_low2, MAX1619_REG_W_REMOTE_LOW);
	170	set_temp2(temp_high2, MAX1619_REG_W_REMOTE_HIGH);
	171	set_temp2(temp_crit2, MAX1619_REG_W_REMOTE_CRIT);
	172	set_temp2(temp_hyst2, MAX1619_REG_W_TCRIT_HYST);
	173
8627f9ba	174	static ssize_t show_alarms(struct device dev, struct device_attribute attr, char *buf)
1da177e4 LT	175	{
	176	struct max1619_data *data = max1619_update_device(dev);
	177	return sprintf(buf, "%d\n", data->alarms);
	178	}
	179
71062ffc JD	180	static ssize_t show_alarm(struct device dev, struct device_attribute attr,
	181	char *buf)
	182	{
	183	int bitnr = to_sensor_dev_attr(attr)->index;
	184	struct max1619_data *data = max1619_update_device(dev);
	185	return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
	186	}
	187
1da177e4 LT	188	static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
	189	static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL);
	190	static DEVICE_ATTR(temp2_min, S_IWUSR \| S_IRUGO, show_temp_low2,
	191	set_temp_low2);
	192	static DEVICE_ATTR(temp2_max, S_IWUSR \| S_IRUGO, show_temp_high2,
	193	set_temp_high2);
	194	static DEVICE_ATTR(temp2_crit, S_IWUSR \| S_IRUGO, show_temp_crit2,
	195	set_temp_crit2);
	196	static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR \| S_IRUGO, show_temp_hyst2,
	197	set_temp_hyst2);
	198	static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
71062ffc JD	199	static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
	200	static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
	201	static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
	202	static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
1da177e4	203
a5ebe668 JD	204	static struct attribute *max1619_attributes[] = {
	205	&dev_attr_temp1_input.attr,
	206	&dev_attr_temp2_input.attr,
	207	&dev_attr_temp2_min.attr,
	208	&dev_attr_temp2_max.attr,
	209	&dev_attr_temp2_crit.attr,
	210	&dev_attr_temp2_crit_hyst.attr,
	211
	212	&dev_attr_alarms.attr,
71062ffc JD	213	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	214	&sensor_dev_attr_temp2_fault.dev_attr.attr,
	215	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
	216	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
a5ebe668 JD	217	NULL
	218	};
	219
	220	static const struct attribute_group max1619_group = {
	221	.attrs = max1619_attributes,
	222	};
	223
1da177e4 LT	224	/*
	225	* Real code
	226	*/
	227
c6d3f6fa JD	228	/* Return 0 if detection is successful, -ENODEV otherwise */
	229	static int max1619_detect(struct i2c_client *new_client, int kind,
	230	struct i2c_board_info *info)
1da177e4	231	{
c6d3f6fa	232	struct i2c_adapter *adapter = new_client->adapter;
1da177e4	233	u8 reg_config=0, reg_convrate=0, reg_status=0;
b0020e3f	234
1da177e4	235	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
c6d3f6fa	236	return -ENODEV;
1da177e4 LT	237
	238	/*
	239	* Now we do the remaining detection. A negative kind means that
	240	* the driver was loaded with no force parameter (default), so we
	241	* must both detect and identify the chip. A zero kind means that
	242	* the driver was loaded with the force parameter, the detection
	243	* step shall be skipped. A positive kind means that the driver
	244	* was loaded with the force parameter and a given kind of chip is
	245	* requested, so both the detection and the identification steps
	246	* are skipped.
	247	*/
	248	if (kind < 0) { /* detection */
	249	reg_config = i2c_smbus_read_byte_data(new_client,
	250	MAX1619_REG_R_CONFIG);
	251	reg_convrate = i2c_smbus_read_byte_data(new_client,
	252	MAX1619_REG_R_CONVRATE);
	253	reg_status = i2c_smbus_read_byte_data(new_client,
	254	MAX1619_REG_R_STATUS);
	255	if ((reg_config & 0x03) != 0x00
	256	\|\| reg_convrate > 0x07 \|\| (reg_status & 0x61 ) !=0x00) {
	257	dev_dbg(&adapter->dev,
	258	"MAX1619 detection failed at 0x%02x.\n",
c6d3f6fa JD	259	new_client->addr);
c6d3f6fa JD	260	return -ENODEV;
1da177e4 LT	261	}
	262	}
	263
	264	if (kind <= 0) { /* identification */
b0020e3f	265	u8 man_id, chip_id;
1da177e4 LT	266
	267	man_id = i2c_smbus_read_byte_data(new_client,
	268	MAX1619_REG_R_MAN_ID);
	269	chip_id = i2c_smbus_read_byte_data(new_client,
	270	MAX1619_REG_R_CHIP_ID);
	271
b0020e3f AM	272	if ((man_id == 0x4D) && (chip_id == 0x04))
b0020e3f AM	273	kind = max1619;
1da177e4 LT	274
	275	if (kind <= 0) { /* identification failed */
	276	dev_info(&adapter->dev,
	277	"Unsupported chip (man_id=0x%02X, "
	278	"chip_id=0x%02X).\n", man_id, chip_id);
c6d3f6fa	279	return -ENODEV;
1da177e4	280	}
b0020e3f	281	}
1da177e4	282
c6d3f6fa JD	283	strlcpy(info->type, "max1619", I2C_NAME_SIZE);
	284
	285	return 0;
	286	}
	287
	288	static int max1619_probe(struct i2c_client *new_client,
	289	const struct i2c_device_id *id)
	290	{
	291	struct max1619_data *data;
	292	int err;
	293
	294	data = kzalloc(sizeof(struct max1619_data), GFP_KERNEL);
	295	if (!data) {
	296	err = -ENOMEM;
	297	goto exit;
	298	}
1da177e4	299
c6d3f6fa	300	i2c_set_clientdata(new_client, data);
1da177e4	301	data->valid = 0;
9a61bf63	302	mutex_init(&data->update_lock);
1da177e4	303
1da177e4 LT	304	/* Initialize the MAX1619 chip */
	305	max1619_init_client(new_client);
	306
	307	/* Register sysfs hooks */
a5ebe668	308	if ((err = sysfs_create_group(&new_client->dev.kobj, &max1619_group)))
c6d3f6fa	309	goto exit_free;
a5ebe668	310
1beeffe4 TJ	311	data->hwmon_dev = hwmon_device_register(&new_client->dev);
	312	if (IS_ERR(data->hwmon_dev)) {
	313	err = PTR_ERR(data->hwmon_dev);
a5ebe668	314	goto exit_remove_files;
943b0830 MH	315	}
943b0830 MH	316
1da177e4 LT	317	return 0;
1da177e4 LT	318
a5ebe668 JD	319	exit_remove_files:
a5ebe668 JD	320	sysfs_remove_group(&new_client->dev.kobj, &max1619_group);
1da177e4 LT	321	exit_free:
	322	kfree(data);
	323	exit:
	324	return err;
	325	}
	326
	327	static void max1619_init_client(struct i2c_client *client)
	328	{
	329	u8 config;
	330
	331	/*
	332	* Start the conversions.
	333	*/
	334	i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE,
	335	5); /* 2 Hz */
	336	config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
	337	if (config & 0x40)
	338	i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG,
	339	config & 0xBF); /* run */
	340	}
	341
c6d3f6fa	342	static int max1619_remove(struct i2c_client *client)
1da177e4	343	{
943b0830	344	struct max1619_data *data = i2c_get_clientdata(client);
1da177e4	345
1beeffe4	346	hwmon_device_unregister(data->hwmon_dev);
a5ebe668	347	sysfs_remove_group(&client->dev.kobj, &max1619_group);
943b0830	348
943b0830	349	kfree(data);
1da177e4 LT	350	return 0;
	351	}
	352
	353	static struct max1619_data max1619_update_device(struct device dev)
	354	{
	355	struct i2c_client *client = to_i2c_client(dev);
	356	struct max1619_data *data = i2c_get_clientdata(client);
	357
9a61bf63	358	mutex_lock(&data->update_lock);
1da177e4 LT	359
	360	if (time_after(jiffies, data->last_updated + HZ * 2) \|\| !data->valid) {
	361	dev_dbg(&client->dev, "Updating max1619 data.\n");
	362	data->temp_input1 = i2c_smbus_read_byte_data(client,
	363	MAX1619_REG_R_LOCAL_TEMP);
	364	data->temp_input2 = i2c_smbus_read_byte_data(client,
	365	MAX1619_REG_R_REMOTE_TEMP);
	366	data->temp_high2 = i2c_smbus_read_byte_data(client,
	367	MAX1619_REG_R_REMOTE_HIGH);
	368	data->temp_low2 = i2c_smbus_read_byte_data(client,
	369	MAX1619_REG_R_REMOTE_LOW);
	370	data->temp_crit2 = i2c_smbus_read_byte_data(client,
	371	MAX1619_REG_R_REMOTE_CRIT);
	372	data->temp_hyst2 = i2c_smbus_read_byte_data(client,
	373	MAX1619_REG_R_TCRIT_HYST);
	374	data->alarms = i2c_smbus_read_byte_data(client,
	375	MAX1619_REG_R_STATUS);
	376
	377	data->last_updated = jiffies;
	378	data->valid = 1;
	379	}
	380
9a61bf63	381	mutex_unlock(&data->update_lock);
1da177e4 LT	382
	383	return data;
	384	}
	385
	386	static int __init sensors_max1619_init(void)
	387	{
	388	return i2c_add_driver(&max1619_driver);
	389	}
	390
	391	static void __exit sensors_max1619_exit(void)
	392	{
	393	i2c_del_driver(&max1619_driver);
	394	}
	395
368609c5	396	MODULE_AUTHOR("Alexey Fisher <fishor@mail.ru> and "
1da177e4 LT	397	"Jean Delvare <khali@linux-fr.org>");
	398	MODULE_DESCRIPTION("MAX1619 sensor driver");
	399	MODULE_LICENSE("GPL");
	400
	401	module_init(sensors_max1619_init);
	402	module_exit(sensors_max1619_exit);