[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 */
I2C_CLIENT_INSMOD_1(ds1621);
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", ds1621 },
	{ "ds1625", ds1621 },
	{ }
};
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_data	= &addr_data,
};

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 */
f4b50261	41	I2C_CLIENT_INSMOD_1(ds1621);
1da177e4 LT	42	static int polarity = -1;
	43	module_param(polarity, int, 0);
	44	MODULE_PARM_DESC(polarity, "Output's polarity: 0 = active high, 1 = active low");
	45
	46	/* Many DS1621 constants specified below */
	47	/* Config register used for detection */
	48	/* 7 6 5 4 3 2 1 0 */
	49	/* \|Done\|THF \|TLF \|NVB \| X \| X \|POL \|1SHOT\| */
	50	#define DS1621_REG_CONFIG_NVB 0x10
	51	#define DS1621_REG_CONFIG_POLARITY 0x02
	52	#define DS1621_REG_CONFIG_1SHOT 0x01
	53	#define DS1621_REG_CONFIG_DONE 0x80
	54
	55	/* The DS1621 registers */
46a2e71c JD	56	static const u8 DS1621_REG_TEMP[3] = {
	57	0xAA, /* input, word, RO */
	58	0xA2, /* min, word, RW */
	59	0xA1, /* max, word, RW */
	60	};
1da177e4 LT	61	#define DS1621_REG_CONF 0xAC /* byte, RW */
	62	#define DS1621_COM_START 0xEE /* no data */
	63	#define DS1621_COM_STOP 0x22 /* no data */
	64
	65	/* The DS1621 configuration register */
	66	#define DS1621_ALARM_TEMP_HIGH 0x40
	67	#define DS1621_ALARM_TEMP_LOW 0x20
	68
75819f01	69	/* Conversions */
1da177e4 LT	70	#define ALARMS_FROM_REG(val) ((val) & \
	71	(DS1621_ALARM_TEMP_HIGH \| DS1621_ALARM_TEMP_LOW))
	72
	73	/* Each client has this additional data */
	74	struct ds1621_data {
1beeffe4	75	struct device *hwmon_dev;
9a61bf63	76	struct mutex update_lock;
1da177e4 LT	77	char valid; /* !=0 if following fields are valid */
	78	unsigned long last_updated; /* In jiffies */
	79
46a2e71c	80	u16 temp[3]; /* Register values, word */
1da177e4 LT	81	u8 conf; /* Register encoding, combined */
	82	};
	83
594592dc	84	/* Temperature registers are word-sized.
1da177e4	85	DS1621 uses a high-byte first convention, which is exactly opposite to
75819f01	86	the SMBus standard. */
594592dc	87	static int ds1621_read_temp(struct i2c_client *client, u8 reg)
1da177e4	88	{
594592dc JD	89	int ret;
	90
	91	ret = i2c_smbus_read_word_data(client, reg);
	92	if (ret < 0)
	93	return ret;
	94	return swab16(ret);
1da177e4 LT	95	}
1da177e4 LT	96
594592dc	97	static int ds1621_write_temp(struct i2c_client *client, u8 reg, u16 value)
1da177e4	98	{
594592dc	99	return i2c_smbus_write_word_data(client, reg, swab16(value));
1da177e4 LT	100	}
	101
	102	static void ds1621_init_client(struct i2c_client *client)
	103	{
e4879e28 JD	104	u8 conf, new_conf;
	105
	106	new_conf = conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF);
44bbe87e	107	/* switch to continuous conversion mode */
e4879e28	108	new_conf &= ~DS1621_REG_CONFIG_1SHOT;
1da177e4 LT	109
	110	/* setup output polarity */
	111	if (polarity == 0)
e4879e28	112	new_conf &= ~DS1621_REG_CONFIG_POLARITY;
1da177e4	113	else if (polarity == 1)
e4879e28	114	new_conf \|= DS1621_REG_CONFIG_POLARITY;
1da177e4	115
e4879e28 JD	116	if (conf != new_conf)
e4879e28 JD	117	i2c_smbus_write_byte_data(client, DS1621_REG_CONF, new_conf);
1da177e4 LT	118
	119	/* start conversion */
	120	i2c_smbus_write_byte(client, DS1621_COM_START);
	121	}
	122
9202add6 JD	123	static struct ds1621_data ds1621_update_client(struct device dev)
	124	{
	125	struct i2c_client *client = to_i2c_client(dev);
	126	struct ds1621_data *data = i2c_get_clientdata(client);
	127	u8 new_conf;
	128
	129	mutex_lock(&data->update_lock);
	130
	131	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	132	\|\| !data->valid) {
	133	int i;
	134
	135	dev_dbg(&client->dev, "Starting ds1621 update\n");
	136
594592dc	137	data->conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF);
9202add6 JD	138
9202add6 JD	139	for (i = 0; i < ARRAY_SIZE(data->temp); i++)
594592dc JD	140	data->temp[i] = ds1621_read_temp(client,
594592dc JD	141	DS1621_REG_TEMP[i]);
9202add6 JD	142
	143	/* reset alarms if necessary */
	144	new_conf = data->conf;
	145	if (data->temp[0] > data->temp[1]) /* input > min */
	146	new_conf &= ~DS1621_ALARM_TEMP_LOW;
	147	if (data->temp[0] < data->temp[2]) /* input < max */
	148	new_conf &= ~DS1621_ALARM_TEMP_HIGH;
	149	if (data->conf != new_conf)
594592dc JD	150	i2c_smbus_write_byte_data(client, DS1621_REG_CONF,
594592dc JD	151	new_conf);
9202add6 JD	152
	153	data->last_updated = jiffies;
	154	data->valid = 1;
	155	}
	156
	157	mutex_unlock(&data->update_lock);
	158
	159	return data;
	160	}
	161
46a2e71c JD	162	static ssize_t show_temp(struct device dev, struct device_attribute da,
	163	char *buf)
	164	{
	165	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	166	struct ds1621_data *data = ds1621_update_client(dev);
	167	return sprintf(buf, "%d\n",
	168	LM75_TEMP_FROM_REG(data->temp[attr->index]));
1da177e4 LT	169	}
1da177e4 LT	170
46a2e71c JD	171	static ssize_t set_temp(struct device dev, struct device_attribute da,
	172	const char *buf, size_t count)
	173	{
	174	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	175	struct i2c_client *client = to_i2c_client(dev);
e4879e28	176	struct ds1621_data *data = i2c_get_clientdata(client);
5bfedac0	177	u16 val = LM75_TEMP_TO_REG(simple_strtol(buf, NULL, 10));
1da177e4	178
46a2e71c JD	179	mutex_lock(&data->update_lock);
46a2e71c JD	180	data->temp[attr->index] = val;
594592dc JD	181	ds1621_write_temp(client, DS1621_REG_TEMP[attr->index],
594592dc JD	182	data->temp[attr->index]);
46a2e71c JD	183	mutex_unlock(&data->update_lock);
	184	return count;
	185	}
1da177e4	186
46a2e71c JD	187	static ssize_t show_alarms(struct device dev, struct device_attribute da,
46a2e71c JD	188	char *buf)
1da177e4 LT	189	{
	190	struct ds1621_data *data = ds1621_update_client(dev);
	191	return sprintf(buf, "%d\n", ALARMS_FROM_REG(data->conf));
	192	}
	193
87f0f31b JD	194	static ssize_t show_alarm(struct device dev, struct device_attribute da,
	195	char *buf)
	196	{
	197	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	198	struct ds1621_data *data = ds1621_update_client(dev);
	199	return sprintf(buf, "%d\n", !!(data->conf & attr->index));
	200	}
	201
1da177e4	202	static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
46a2e71c JD	203	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
	204	static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR \| S_IRUGO, show_temp, set_temp, 1);
	205	static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR \| S_IRUGO, show_temp, set_temp, 2);
87f0f31b JD	206	static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL,
	207	DS1621_ALARM_TEMP_LOW);
	208	static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL,
	209	DS1621_ALARM_TEMP_HIGH);
1da177e4	210
a5ebe668	211	static struct attribute *ds1621_attributes[] = {
46a2e71c JD	212	&sensor_dev_attr_temp1_input.dev_attr.attr,
	213	&sensor_dev_attr_temp1_min.dev_attr.attr,
	214	&sensor_dev_attr_temp1_max.dev_attr.attr,
87f0f31b JD	215	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
87f0f31b JD	216	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
a5ebe668 JD	217	&dev_attr_alarms.attr,
	218	NULL
	219	};
	220
	221	static const struct attribute_group ds1621_group = {
	222	.attrs = ds1621_attributes,
	223	};
	224
1da177e4	225
70313eab	226	/* Return 0 if detection is successful, -ENODEV otherwise */
310ec792	227	static int ds1621_detect(struct i2c_client *client,
70313eab	228	struct i2c_board_info *info)
1da177e4	229	{
70313eab	230	struct i2c_adapter *adapter = client->adapter;
1da177e4	231	int conf, temp;
70313eab	232	int i;
1da177e4 LT	233
	234	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
	235	\| I2C_FUNC_SMBUS_WORD_DATA
	236	\| I2C_FUNC_SMBUS_WRITE_BYTE))
70313eab	237	return -ENODEV;
1da177e4 LT	238
1da177e4 LT	239	/* Now, we do the remaining detection. It is lousy. */
52df6440 JD	240	/* The NVB bit should be low if no EEPROM write has been requested
	241	during the latest 10ms, which is highly improbable in our case. */
	242	conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF);
	243	if (conf < 0 \|\| conf & DS1621_REG_CONFIG_NVB)
	244	return -ENODEV;
	245	/* The 7 lowest bits of a temperature should always be 0. */
	246	for (i = 0; i < ARRAY_SIZE(DS1621_REG_TEMP); i++) {
	247	temp = i2c_smbus_read_word_data(client, DS1621_REG_TEMP[i]);
	248	if (temp < 0 \|\| (temp & 0x7f00))
70313eab	249	return -ENODEV;
1da177e4 LT	250	}
1da177e4 LT	251
70313eab	252	strlcpy(info->type, "ds1621", I2C_NAME_SIZE);
1da177e4	253
70313eab JD	254	return 0;
	255	}
	256
	257	static int ds1621_probe(struct i2c_client *client,
	258	const struct i2c_device_id *id)
	259	{
	260	struct ds1621_data *data;
	261	int err;
	262
	263	data = kzalloc(sizeof(struct ds1621_data), GFP_KERNEL);
	264	if (!data) {
	265	err = -ENOMEM;
	266	goto exit;
	267	}
	268
	269	i2c_set_clientdata(client, data);
	270	mutex_init(&data->update_lock);
1da177e4 LT	271
1da177e4 LT	272	/* Initialize the DS1621 chip */
75819f01	273	ds1621_init_client(client);
1da177e4 LT	274
1da177e4 LT	275	/* Register sysfs hooks */
75819f01	276	if ((err = sysfs_create_group(&client->dev.kobj, &ds1621_group)))
70313eab	277	goto exit_free;
a5ebe668	278
1beeffe4 TJ	279	data->hwmon_dev = hwmon_device_register(&client->dev);
	280	if (IS_ERR(data->hwmon_dev)) {
	281	err = PTR_ERR(data->hwmon_dev);
a5ebe668	282	goto exit_remove_files;
943b0830 MH	283	}
943b0830 MH	284
1da177e4 LT	285	return 0;
1da177e4 LT	286
a5ebe668	287	exit_remove_files:
75819f01	288	sysfs_remove_group(&client->dev.kobj, &ds1621_group);
1da177e4 LT	289	exit_free:
	290	kfree(data);
	291	exit:
	292	return err;
	293	}
	294
70313eab	295	static int ds1621_remove(struct i2c_client *client)
1da177e4	296	{
943b0830	297	struct ds1621_data *data = i2c_get_clientdata(client);
1da177e4	298
1beeffe4	299	hwmon_device_unregister(data->hwmon_dev);
a5ebe668	300	sysfs_remove_group(&client->dev.kobj, &ds1621_group);
943b0830	301
943b0830	302	kfree(data);
1da177e4 LT	303
	304	return 0;
	305	}
	306
9202add6 JD	307	static const struct i2c_device_id ds1621_id[] = {
	308	{ "ds1621", ds1621 },
	309	{ "ds1625", ds1621 },
	310	{ }
	311	};
	312	MODULE_DEVICE_TABLE(i2c, ds1621_id);
1da177e4	313
9202add6 JD	314	/* This is the driver that will be inserted */
	315	static struct i2c_driver ds1621_driver = {
	316	.class = I2C_CLASS_HWMON,
	317	.driver = {
	318	.name = "ds1621",
	319	},
	320	.probe = ds1621_probe,
	321	.remove = ds1621_remove,
	322	.id_table = ds1621_id,
	323	.detect = ds1621_detect,
	324	.address_data = &addr_data,
	325	};
1da177e4 LT	326
	327	static int __init ds1621_init(void)
	328	{
	329	return i2c_add_driver(&ds1621_driver);
	330	}
	331
	332	static void __exit ds1621_exit(void)
	333	{
	334	i2c_del_driver(&ds1621_driver);
	335	}
	336
	337
	338	MODULE_AUTHOR("Christian W. Zuckschwerdt <zany@triq.net>");
	339	MODULE_DESCRIPTION("DS1621 driver");
	340	MODULE_LICENSE("GPL");
	341
	342	module_init(ds1621_init);
	343	module_exit(ds1621_exit);