[net-next-2.6.git] / drivers / hwmon / ds1621.c

/*
    ds1621.c - Part of lm_sensors, Linux kernel modules for hardware
             monitoring
    Christian W. Zuckschwerdt  <zany@triq.net>  2000-11-23
    based on lm75.c by Frodo Looijaard <frodol@dds.nl>
    Ported to Linux 2.6 by Aurelien Jarno <aurelien@aurel32.net> with 
    the help of Jean Delvare <khali@linux-fr.org>

    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>
#include "lm75.h"

/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
					0x4d, 0x4e, 0x4f, I2C_CLIENT_END };

/* Insmod parameters */
static int polarity = -1;
module_param(polarity, int, 0);
MODULE_PARM_DESC(polarity, "Output's polarity: 0 = active high, 1 = active low");

/* Many DS1621 constants specified below */
/* Config register used for detection         */
/*  7    6    5    4    3    2    1    0      */
/* |Done|THF |TLF |NVB | X  | X  |POL |1SHOT| */
#define DS1621_REG_CONFIG_NVB		0x10
#define DS1621_REG_CONFIG_POLARITY	0x02
#define DS1621_REG_CONFIG_1SHOT		0x01
#define DS1621_REG_CONFIG_DONE		0x80

/* The DS1621 registers */
static const u8 DS1621_REG_TEMP[3] = {
	0xAA,		/* input, word, RO */
	0xA2,		/* min, word, RW */
	0xA1,		/* max, word, RW */
};
#define DS1621_REG_CONF			0xAC /* byte, RW */
#define DS1621_COM_START		0xEE /* no data */
#define DS1621_COM_STOP			0x22 /* no data */

/* The DS1621 configuration register */
#define DS1621_ALARM_TEMP_HIGH		0x40
#define DS1621_ALARM_TEMP_LOW		0x20

/* Conversions */
#define ALARMS_FROM_REG(val) ((val) & \
                              (DS1621_ALARM_TEMP_HIGH | DS1621_ALARM_TEMP_LOW))

/* Each client has this additional data */
struct ds1621_data {
	struct device *hwmon_dev;
	struct mutex update_lock;
	char valid;			/* !=0 if following fields are valid */
	unsigned long last_updated;	/* In jiffies */

	u16 temp[3];			/* Register values, word */
	u8 conf;			/* Register encoding, combined */
};

/* Temperature registers are word-sized.
   DS1621 uses a high-byte first convention, which is exactly opposite to
   the SMBus standard. */
static int ds1621_read_temp(struct i2c_client *client, u8 reg)
{
	int ret;

	ret = i2c_smbus_read_word_data(client, reg);
	if (ret < 0)
		return ret;
	return swab16(ret);
}

static int ds1621_write_temp(struct i2c_client *client, u8 reg, u16 value)
{
	return i2c_smbus_write_word_data(client, reg, swab16(value));
}

static void ds1621_init_client(struct i2c_client *client)
{
	u8 conf, new_conf;

	new_conf = conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF);
	/* switch to continuous conversion mode */
	new_conf &= ~DS1621_REG_CONFIG_1SHOT;

	/* setup output polarity */
	if (polarity == 0)
		new_conf &= ~DS1621_REG_CONFIG_POLARITY;
	else if (polarity == 1)
		new_conf |= DS1621_REG_CONFIG_POLARITY;
	
	if (conf != new_conf)
		i2c_smbus_write_byte_data(client, DS1621_REG_CONF, new_conf);
	
	/* start conversion */
	i2c_smbus_write_byte(client, DS1621_COM_START);
}

static struct ds1621_data *ds1621_update_client(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct ds1621_data *data = i2c_get_clientdata(client);
	u8 new_conf;

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	    || !data->valid) {
		int i;

		dev_dbg(&client->dev, "Starting ds1621 update\n");

		data->conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF);

		for (i = 0; i < ARRAY_SIZE(data->temp); i++)
			data->temp[i] = ds1621_read_temp(client,
							 DS1621_REG_TEMP[i]);

		/* reset alarms if necessary */
		new_conf = data->conf;
		if (data->temp[0] > data->temp[1])	/* input > min */
			new_conf &= ~DS1621_ALARM_TEMP_LOW;
		if (data->temp[0] < data->temp[2])	/* input < max */
			new_conf &= ~DS1621_ALARM_TEMP_HIGH;
		if (data->conf != new_conf)
			i2c_smbus_write_byte_data(client, DS1621_REG_CONF,
						  new_conf);

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

	mutex_unlock(&data->update_lock);

	return data;
}

static ssize_t show_temp(struct device *dev, struct device_attribute *da,
			 char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct ds1621_data *data = ds1621_update_client(dev);
	return sprintf(buf, "%d\n",
		       LM75_TEMP_FROM_REG(data->temp[attr->index]));
}

static ssize_t set_temp(struct device *dev, struct device_attribute *da,
			const char *buf, size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct i2c_client *client = to_i2c_client(dev);
	struct ds1621_data *data = i2c_get_clientdata(client);
	u16 val = LM75_TEMP_TO_REG(simple_strtol(buf, NULL, 10));

	mutex_lock(&data->update_lock);
	data->temp[attr->index] = val;
	ds1621_write_temp(client, DS1621_REG_TEMP[attr->index],
			  data->temp[attr->index]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t show_alarms(struct device *dev, struct device_attribute *da,
			   char *buf)
{
	struct ds1621_data *data = ds1621_update_client(dev);
	return sprintf(buf, "%d\n", ALARMS_FROM_REG(data->conf));
}

static ssize_t show_alarm(struct device *dev, struct device_attribute *da,
			  char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct ds1621_data *data = ds1621_update_client(dev);
	return sprintf(buf, "%d\n", !!(data->conf & attr->index));
}

static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp, set_temp, 1);
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp, set_temp, 2);
static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL,
		DS1621_ALARM_TEMP_LOW);
static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL,
		DS1621_ALARM_TEMP_HIGH);

static struct attribute *ds1621_attributes[] = {
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp1_min.dev_attr.attr,
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	&dev_attr_alarms.attr,
	NULL
};

static const struct attribute_group ds1621_group = {
	.attrs = ds1621_attributes,
};


/* Return 0 if detection is successful, -ENODEV otherwise */
static int ds1621_detect(struct i2c_client *client,
			 struct i2c_board_info *info)
{
	struct i2c_adapter *adapter = client->adapter;
	int conf, temp;
	int i;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA 
				     | I2C_FUNC_SMBUS_WORD_DATA 
				     | I2C_FUNC_SMBUS_WRITE_BYTE))
		return -ENODEV;

	/* Now, we do the remaining detection. It is lousy. */
	/* The NVB bit should be low if no EEPROM write has been  requested
	   during the latest 10ms, which is highly improbable in our case. */
	conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF);
	if (conf < 0 || conf & DS1621_REG_CONFIG_NVB)
		return -ENODEV;
	/* The 7 lowest bits of a temperature should always be 0. */
	for (i = 0; i < ARRAY_SIZE(DS1621_REG_TEMP); i++) {
		temp = i2c_smbus_read_word_data(client, DS1621_REG_TEMP[i]);
		if (temp < 0 || (temp & 0x7f00))
			return -ENODEV;
	}

	strlcpy(info->type, "ds1621", I2C_NAME_SIZE);

	return 0;
}

static int ds1621_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct ds1621_data *data;
	int err;

	data = kzalloc(sizeof(struct ds1621_data), GFP_KERNEL);
	if (!data) {
		err = -ENOMEM;
		goto exit;
	}

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

	/* Initialize the DS1621 chip */
	ds1621_init_client(client);

	/* Register sysfs hooks */
	if ((err = sysfs_create_group(&client->dev.kobj, &ds1621_group)))
		goto exit_free;

	data->hwmon_dev = hwmon_device_register(&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(&client->dev.kobj, &ds1621_group);
      exit_free:
	kfree(data);
      exit:
	return err;
}

static int ds1621_remove(struct i2c_client *client)
{
	struct ds1621_data *data = i2c_get_clientdata(client);

	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&client->dev.kobj, &ds1621_group);

	kfree(data);

	return 0;
}

static const struct i2c_device_id ds1621_id[] = {
	{ "ds1621", 0 },
	{ "ds1625", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, ds1621_id);

/* This is the driver that will be inserted */
static struct i2c_driver ds1621_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "ds1621",
	},
	.probe		= ds1621_probe,
	.remove		= ds1621_remove,
	.id_table	= ds1621_id,
	.detect		= ds1621_detect,
	.address_list	= normal_i2c,
};

static int __init ds1621_init(void)
{
	return i2c_add_driver(&ds1621_driver);
}

static void __exit ds1621_exit(void)
{
	i2c_del_driver(&ds1621_driver);
}


MODULE_AUTHOR("Christian W. Zuckschwerdt <zany@triq.net>");
MODULE_DESCRIPTION("DS1621 driver");
MODULE_LICENSE("GPL");

module_init(ds1621_init);
module_exit(ds1621_exit);
Commit	Line	Data
1da177e4 LT	1	/*
	2	ds1621.c - Part of lm_sensors, Linux kernel modules for hardware
	3	monitoring
	4	Christian W. Zuckschwerdt <zany@triq.net> 2000-11-23
	5	based on lm75.c by Frodo Looijaard <frodol@dds.nl>
	6	Ported to Linux 2.6 by Aurelien Jarno <aurelien@aurel32.net> with
	7	the help of Jean Delvare <khali@linux-fr.org>
	8
	9	This program is free software; you can redistribute it and/or modify
	10	it under the terms of the GNU General Public License as published by
	11	the Free Software Foundation; either version 2 of the License, or
	12	(at your option) any later version.
	13
	14	This program is distributed in the hope that it will be useful,
	15	but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	GNU General Public License for more details.
	18
	19	You should have received a copy of the GNU General Public License
	20	along with this program; if not, write to the Free Software
	21	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	22	*/
	23
	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>
46a2e71c	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 LT	34	#include "lm75.h"
	35
	36	/* Addresses to scan */
25e9c86d	37	static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
1da177e4	38	0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
1da177e4 LT	39
1da177e4 LT	40	/* Insmod parameters */
1da177e4 LT	41	static int polarity = -1;
	42	module_param(polarity, int, 0);
	43	MODULE_PARM_DESC(polarity, "Output's polarity: 0 = active high, 1 = active low");
	44
	45	/* Many DS1621 constants specified below */
	46	/* Config register used for detection */
	47	/* 7 6 5 4 3 2 1 0 */
	48	/* \|Done\|THF \|TLF \|NVB \| X \| X \|POL \|1SHOT\| */
	49	#define DS1621_REG_CONFIG_NVB 0x10
	50	#define DS1621_REG_CONFIG_POLARITY 0x02
	51	#define DS1621_REG_CONFIG_1SHOT 0x01
	52	#define DS1621_REG_CONFIG_DONE 0x80
	53
	54	/* The DS1621 registers */
46a2e71c JD	55	static const u8 DS1621_REG_TEMP[3] = {
	56	0xAA, /* input, word, RO */
	57	0xA2, /* min, word, RW */
	58	0xA1, /* max, word, RW */
	59	};
1da177e4 LT	60	#define DS1621_REG_CONF 0xAC /* byte, RW */
	61	#define DS1621_COM_START 0xEE /* no data */
	62	#define DS1621_COM_STOP 0x22 /* no data */
	63
	64	/* The DS1621 configuration register */
	65	#define DS1621_ALARM_TEMP_HIGH 0x40
	66	#define DS1621_ALARM_TEMP_LOW 0x20
	67
75819f01	68	/* Conversions */
1da177e4 LT	69	#define ALARMS_FROM_REG(val) ((val) & \
	70	(DS1621_ALARM_TEMP_HIGH \| DS1621_ALARM_TEMP_LOW))
	71
	72	/* Each client has this additional data */
	73	struct ds1621_data {
1beeffe4	74	struct device *hwmon_dev;
9a61bf63	75	struct mutex update_lock;
1da177e4 LT	76	char valid; /* !=0 if following fields are valid */
	77	unsigned long last_updated; /* In jiffies */
	78
46a2e71c	79	u16 temp[3]; /* Register values, word */
1da177e4 LT	80	u8 conf; /* Register encoding, combined */
	81	};
	82
594592dc	83	/* Temperature registers are word-sized.
1da177e4	84	DS1621 uses a high-byte first convention, which is exactly opposite to
75819f01	85	the SMBus standard. */
594592dc	86	static int ds1621_read_temp(struct i2c_client *client, u8 reg)
1da177e4	87	{
594592dc JD	88	int ret;
	89
	90	ret = i2c_smbus_read_word_data(client, reg);
	91	if (ret < 0)
	92	return ret;
	93	return swab16(ret);
1da177e4 LT	94	}
1da177e4 LT	95
594592dc	96	static int ds1621_write_temp(struct i2c_client *client, u8 reg, u16 value)
1da177e4	97	{
594592dc	98	return i2c_smbus_write_word_data(client, reg, swab16(value));
1da177e4 LT	99	}
	100
	101	static void ds1621_init_client(struct i2c_client *client)
	102	{
e4879e28 JD	103	u8 conf, new_conf;
	104
	105	new_conf = conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF);
44bbe87e	106	/* switch to continuous conversion mode */
e4879e28	107	new_conf &= ~DS1621_REG_CONFIG_1SHOT;
1da177e4 LT	108
	109	/* setup output polarity */
	110	if (polarity == 0)
e4879e28	111	new_conf &= ~DS1621_REG_CONFIG_POLARITY;
1da177e4	112	else if (polarity == 1)
e4879e28	113	new_conf \|= DS1621_REG_CONFIG_POLARITY;
1da177e4	114
e4879e28 JD	115	if (conf != new_conf)
e4879e28 JD	116	i2c_smbus_write_byte_data(client, DS1621_REG_CONF, new_conf);
1da177e4 LT	117
	118	/* start conversion */
	119	i2c_smbus_write_byte(client, DS1621_COM_START);
	120	}
	121
9202add6 JD	122	static struct ds1621_data ds1621_update_client(struct device dev)
	123	{
	124	struct i2c_client *client = to_i2c_client(dev);
	125	struct ds1621_data *data = i2c_get_clientdata(client);
	126	u8 new_conf;
	127
	128	mutex_lock(&data->update_lock);
	129
	130	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	131	\|\| !data->valid) {
	132	int i;
	133
	134	dev_dbg(&client->dev, "Starting ds1621 update\n");
	135
594592dc	136	data->conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF);
9202add6 JD	137
9202add6 JD	138	for (i = 0; i < ARRAY_SIZE(data->temp); i++)
594592dc JD	139	data->temp[i] = ds1621_read_temp(client,
594592dc JD	140	DS1621_REG_TEMP[i]);
9202add6 JD	141
	142	/* reset alarms if necessary */
	143	new_conf = data->conf;
	144	if (data->temp[0] > data->temp[1]) /* input > min */
	145	new_conf &= ~DS1621_ALARM_TEMP_LOW;
	146	if (data->temp[0] < data->temp[2]) /* input < max */
	147	new_conf &= ~DS1621_ALARM_TEMP_HIGH;
	148	if (data->conf != new_conf)
594592dc JD	149	i2c_smbus_write_byte_data(client, DS1621_REG_CONF,
594592dc JD	150	new_conf);
9202add6 JD	151
	152	data->last_updated = jiffies;
	153	data->valid = 1;
	154	}
	155
	156	mutex_unlock(&data->update_lock);
	157
	158	return data;
	159	}
	160
46a2e71c JD	161	static ssize_t show_temp(struct device dev, struct device_attribute da,
	162	char *buf)
	163	{
	164	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	165	struct ds1621_data *data = ds1621_update_client(dev);
	166	return sprintf(buf, "%d\n",
	167	LM75_TEMP_FROM_REG(data->temp[attr->index]));
1da177e4 LT	168	}
1da177e4 LT	169
46a2e71c JD	170	static ssize_t set_temp(struct device dev, struct device_attribute da,
	171	const char *buf, size_t count)
	172	{
	173	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	174	struct i2c_client *client = to_i2c_client(dev);
e4879e28	175	struct ds1621_data *data = i2c_get_clientdata(client);
5bfedac0	176	u16 val = LM75_TEMP_TO_REG(simple_strtol(buf, NULL, 10));
1da177e4	177
46a2e71c JD	178	mutex_lock(&data->update_lock);
46a2e71c JD	179	data->temp[attr->index] = val;
594592dc JD	180	ds1621_write_temp(client, DS1621_REG_TEMP[attr->index],
594592dc JD	181	data->temp[attr->index]);
46a2e71c JD	182	mutex_unlock(&data->update_lock);
	183	return count;
	184	}
1da177e4	185
46a2e71c JD	186	static ssize_t show_alarms(struct device dev, struct device_attribute da,
46a2e71c JD	187	char *buf)
1da177e4 LT	188	{
	189	struct ds1621_data *data = ds1621_update_client(dev);
	190	return sprintf(buf, "%d\n", ALARMS_FROM_REG(data->conf));
	191	}
	192
87f0f31b JD	193	static ssize_t show_alarm(struct device dev, struct device_attribute da,
	194	char *buf)
	195	{
	196	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	197	struct ds1621_data *data = ds1621_update_client(dev);
	198	return sprintf(buf, "%d\n", !!(data->conf & attr->index));
	199	}
	200
1da177e4	201	static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
46a2e71c JD	202	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
	203	static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR \| S_IRUGO, show_temp, set_temp, 1);
	204	static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR \| S_IRUGO, show_temp, set_temp, 2);
87f0f31b JD	205	static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL,
	206	DS1621_ALARM_TEMP_LOW);
	207	static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL,
	208	DS1621_ALARM_TEMP_HIGH);
1da177e4	209
a5ebe668	210	static struct attribute *ds1621_attributes[] = {
46a2e71c JD	211	&sensor_dev_attr_temp1_input.dev_attr.attr,
	212	&sensor_dev_attr_temp1_min.dev_attr.attr,
	213	&sensor_dev_attr_temp1_max.dev_attr.attr,
87f0f31b JD	214	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
87f0f31b JD	215	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
a5ebe668 JD	216	&dev_attr_alarms.attr,
	217	NULL
	218	};
	219
	220	static const struct attribute_group ds1621_group = {
	221	.attrs = ds1621_attributes,
	222	};
	223
1da177e4	224
70313eab	225	/* Return 0 if detection is successful, -ENODEV otherwise */
310ec792	226	static int ds1621_detect(struct i2c_client *client,
70313eab	227	struct i2c_board_info *info)
1da177e4	228	{
70313eab	229	struct i2c_adapter *adapter = client->adapter;
1da177e4	230	int conf, temp;
70313eab	231	int i;
1da177e4 LT	232
	233	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
	234	\| I2C_FUNC_SMBUS_WORD_DATA
	235	\| I2C_FUNC_SMBUS_WRITE_BYTE))
70313eab	236	return -ENODEV;
1da177e4 LT	237
1da177e4 LT	238	/* Now, we do the remaining detection. It is lousy. */
52df6440 JD	239	/* The NVB bit should be low if no EEPROM write has been requested
	240	during the latest 10ms, which is highly improbable in our case. */
	241	conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF);
	242	if (conf < 0 \|\| conf & DS1621_REG_CONFIG_NVB)
	243	return -ENODEV;
	244	/* The 7 lowest bits of a temperature should always be 0. */
	245	for (i = 0; i < ARRAY_SIZE(DS1621_REG_TEMP); i++) {
	246	temp = i2c_smbus_read_word_data(client, DS1621_REG_TEMP[i]);
	247	if (temp < 0 \|\| (temp & 0x7f00))
70313eab	248	return -ENODEV;
1da177e4 LT	249	}
1da177e4 LT	250
70313eab	251	strlcpy(info->type, "ds1621", I2C_NAME_SIZE);
1da177e4	252
70313eab JD	253	return 0;
	254	}
	255
	256	static int ds1621_probe(struct i2c_client *client,
	257	const struct i2c_device_id *id)
	258	{
	259	struct ds1621_data *data;
	260	int err;
	261
	262	data = kzalloc(sizeof(struct ds1621_data), GFP_KERNEL);
	263	if (!data) {
	264	err = -ENOMEM;
	265	goto exit;
	266	}
	267
	268	i2c_set_clientdata(client, data);
	269	mutex_init(&data->update_lock);
1da177e4 LT	270
1da177e4 LT	271	/* Initialize the DS1621 chip */
75819f01	272	ds1621_init_client(client);
1da177e4 LT	273
1da177e4 LT	274	/* Register sysfs hooks */
75819f01	275	if ((err = sysfs_create_group(&client->dev.kobj, &ds1621_group)))
70313eab	276	goto exit_free;
a5ebe668	277
1beeffe4 TJ	278	data->hwmon_dev = hwmon_device_register(&client->dev);
	279	if (IS_ERR(data->hwmon_dev)) {
	280	err = PTR_ERR(data->hwmon_dev);
a5ebe668	281	goto exit_remove_files;
943b0830 MH	282	}
943b0830 MH	283
1da177e4 LT	284	return 0;
1da177e4 LT	285
a5ebe668	286	exit_remove_files:
75819f01	287	sysfs_remove_group(&client->dev.kobj, &ds1621_group);
1da177e4 LT	288	exit_free:
	289	kfree(data);
	290	exit:
	291	return err;
	292	}
	293
70313eab	294	static int ds1621_remove(struct i2c_client *client)
1da177e4	295	{
943b0830	296	struct ds1621_data *data = i2c_get_clientdata(client);
1da177e4	297
1beeffe4	298	hwmon_device_unregister(data->hwmon_dev);
a5ebe668	299	sysfs_remove_group(&client->dev.kobj, &ds1621_group);
943b0830	300
943b0830	301	kfree(data);
1da177e4 LT	302
	303	return 0;
	304	}
	305
9202add6	306	static const struct i2c_device_id ds1621_id[] = {
1f86df49 JD	307	{ "ds1621", 0 },
1f86df49 JD	308	{ "ds1625", 0 },
9202add6 JD	309	{ }
	310	};
	311	MODULE_DEVICE_TABLE(i2c, ds1621_id);
1da177e4	312
9202add6 JD	313	/* This is the driver that will be inserted */
	314	static struct i2c_driver ds1621_driver = {
	315	.class = I2C_CLASS_HWMON,
	316	.driver = {
	317	.name = "ds1621",
	318	},
	319	.probe = ds1621_probe,
	320	.remove = ds1621_remove,
	321	.id_table = ds1621_id,
	322	.detect = ds1621_detect,
c3813d6a	323	.address_list = normal_i2c,
9202add6	324	};
1da177e4 LT	325
	326	static int __init ds1621_init(void)
	327	{
	328	return i2c_add_driver(&ds1621_driver);
	329	}
	330
	331	static void __exit ds1621_exit(void)
	332	{
	333	i2c_del_driver(&ds1621_driver);
	334	}
	335
	336
	337	MODULE_AUTHOR("Christian W. Zuckschwerdt <zany@triq.net>");
	338	MODULE_DESCRIPTION("DS1621 driver");
	339	MODULE_LICENSE("GPL");
	340
	341	module_init(ds1621_init);
	342	module_exit(ds1621_exit);