[deliverable/linux.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 and various macros
 */

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