[linux-2.6-block.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 */
};

static int ds1621_probe(struct i2c_client *client,
			const struct i2c_device_id *id);
static int ds1621_detect(struct i2c_client *client, int kind,
			 struct i2c_board_info *info);
static void ds1621_init_client(struct i2c_client *client);
static int ds1621_remove(struct i2c_client *client);
static struct ds1621_data *ds1621_update_client(struct device *dev);

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,
};

/* All registers are word-sized, except for the configuration register.
   DS1621 uses a high-byte first convention, which is exactly opposite to
   the SMBus standard. */
static int ds1621_read_value(struct i2c_client *client, u8 reg)
{
	if (reg == DS1621_REG_CONF)
		return i2c_smbus_read_byte_data(client, reg);
	else
		return swab16(i2c_smbus_read_word_data(client, reg));
}

static int ds1621_write_value(struct i2c_client *client, u8 reg, u16 value)
{
	if (reg == DS1621_REG_CONF)
		return i2c_smbus_write_byte_data(client, reg, value);
	else
		return i2c_smbus_write_word_data(client, reg, swab16(value));
}

static void ds1621_init_client(struct i2c_client *client)
{
	int reg = ds1621_read_value(client, DS1621_REG_CONF);
	/* switch to continuous conversion mode */
	reg &= ~ DS1621_REG_CONFIG_1SHOT;

	/* setup output polarity */
	if (polarity == 0)
		reg &= ~DS1621_REG_CONFIG_POLARITY;
	else if (polarity == 1)
		reg |= DS1621_REG_CONFIG_POLARITY;
	
	ds1621_write_value(client, DS1621_REG_CONF, reg);
	
	/* start conversion */
	i2c_smbus_write_byte(client, DS1621_COM_START);
}

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 = ds1621_update_client(dev);
	u16 val = LM75_TEMP_TO_REG(simple_strtol(buf, NULL, 10));

	mutex_lock(&data->update_lock);
	data->temp[attr->index] = val;
	ds1621_write_value(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, int kind,
			 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. */
	if (kind < 0) {
		/* 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 = ds1621_read_value(client, DS1621_REG_CONF);
		if (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 = ds1621_read_value(client, DS1621_REG_TEMP[i]);
			if (temp & 0x007f)
				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 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 = ds1621_read_value(client, DS1621_REG_CONF);

		for (i = 0; i < ARRAY_SIZE(data->temp); i++)
			data->temp[i] = ds1621_read_value(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)
			ds1621_write_value(client, DS1621_REG_CONF,
					   new_conf);

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

	mutex_unlock(&data->update_lock);

	return 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
70313eab JD	84	static int ds1621_probe(struct i2c_client *client,
	85	const struct i2c_device_id *id);
	86	static int ds1621_detect(struct i2c_client *client, int kind,
	87	struct i2c_board_info *info);
1da177e4	88	static void ds1621_init_client(struct i2c_client *client);
70313eab	89	static int ds1621_remove(struct i2c_client *client);
1da177e4 LT	90	static struct ds1621_data ds1621_update_client(struct device dev);
1da177e4 LT	91
70313eab JD	92	static const struct i2c_device_id ds1621_id[] = {
	93	{ "ds1621", ds1621 },
	94	{ "ds1625", ds1621 },
	95	{ }
	96	};
	97	MODULE_DEVICE_TABLE(i2c, ds1621_id);
	98
1da177e4 LT	99	/* This is the driver that will be inserted */
1da177e4 LT	100	static struct i2c_driver ds1621_driver = {
70313eab	101	.class = I2C_CLASS_HWMON,
cdaf7934	102	.driver = {
cdaf7934 LR	103	.name = "ds1621",
cdaf7934 LR	104	},
70313eab JD	105	.probe = ds1621_probe,
	106	.remove = ds1621_remove,
	107	.id_table = ds1621_id,
	108	.detect = ds1621_detect,
	109	.address_data = &addr_data,
1da177e4 LT	110	};
	111
	112	/* All registers are word-sized, except for the configuration register.
	113	DS1621 uses a high-byte first convention, which is exactly opposite to
75819f01	114	the SMBus standard. */
1da177e4 LT	115	static int ds1621_read_value(struct i2c_client *client, u8 reg)
	116	{
	117	if (reg == DS1621_REG_CONF)
	118	return i2c_smbus_read_byte_data(client, reg);
	119	else
	120	return swab16(i2c_smbus_read_word_data(client, reg));
	121	}
	122
1da177e4 LT	123	static int ds1621_write_value(struct i2c_client *client, u8 reg, u16 value)
	124	{
	125	if (reg == DS1621_REG_CONF)
	126	return i2c_smbus_write_byte_data(client, reg, value);
	127	else
	128	return i2c_smbus_write_word_data(client, reg, swab16(value));
	129	}
	130
	131	static void ds1621_init_client(struct i2c_client *client)
	132	{
	133	int reg = ds1621_read_value(client, DS1621_REG_CONF);
44bbe87e	134	/* switch to continuous conversion mode */
1da177e4 LT	135	reg &= ~ DS1621_REG_CONFIG_1SHOT;
	136
	137	/* setup output polarity */
	138	if (polarity == 0)
	139	reg &= ~DS1621_REG_CONFIG_POLARITY;
	140	else if (polarity == 1)
	141	reg \|= DS1621_REG_CONFIG_POLARITY;
	142
	143	ds1621_write_value(client, DS1621_REG_CONF, reg);
	144
	145	/* start conversion */
	146	i2c_smbus_write_byte(client, DS1621_COM_START);
	147	}
	148
46a2e71c JD	149	static ssize_t show_temp(struct device dev, struct device_attribute da,
	150	char *buf)
	151	{
	152	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	153	struct ds1621_data *data = ds1621_update_client(dev);
	154	return sprintf(buf, "%d\n",
	155	LM75_TEMP_FROM_REG(data->temp[attr->index]));
1da177e4 LT	156	}
1da177e4 LT	157
46a2e71c JD	158	static ssize_t set_temp(struct device dev, struct device_attribute da,
	159	const char *buf, size_t count)
	160	{
	161	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	162	struct i2c_client *client = to_i2c_client(dev);
	163	struct ds1621_data *data = ds1621_update_client(dev);
5bfedac0	164	u16 val = LM75_TEMP_TO_REG(simple_strtol(buf, NULL, 10));
1da177e4	165
46a2e71c JD	166	mutex_lock(&data->update_lock);
	167	data->temp[attr->index] = val;
	168	ds1621_write_value(client, DS1621_REG_TEMP[attr->index],
	169	data->temp[attr->index]);
	170	mutex_unlock(&data->update_lock);
	171	return count;
	172	}
1da177e4	173
46a2e71c JD	174	static ssize_t show_alarms(struct device dev, struct device_attribute da,
46a2e71c JD	175	char *buf)
1da177e4 LT	176	{
	177	struct ds1621_data *data = ds1621_update_client(dev);
	178	return sprintf(buf, "%d\n", ALARMS_FROM_REG(data->conf));
	179	}
	180
87f0f31b JD	181	static ssize_t show_alarm(struct device dev, struct device_attribute da,
	182	char *buf)
	183	{
	184	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	185	struct ds1621_data *data = ds1621_update_client(dev);
	186	return sprintf(buf, "%d\n", !!(data->conf & attr->index));
	187	}
	188
1da177e4	189	static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
46a2e71c JD	190	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
	191	static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR \| S_IRUGO, show_temp, set_temp, 1);
	192	static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR \| S_IRUGO, show_temp, set_temp, 2);
87f0f31b JD	193	static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL,
	194	DS1621_ALARM_TEMP_LOW);
	195	static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL,
	196	DS1621_ALARM_TEMP_HIGH);
1da177e4	197
a5ebe668	198	static struct attribute *ds1621_attributes[] = {
46a2e71c JD	199	&sensor_dev_attr_temp1_input.dev_attr.attr,
	200	&sensor_dev_attr_temp1_min.dev_attr.attr,
	201	&sensor_dev_attr_temp1_max.dev_attr.attr,
87f0f31b JD	202	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
87f0f31b JD	203	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
a5ebe668 JD	204	&dev_attr_alarms.attr,
	205	NULL
	206	};
	207
	208	static const struct attribute_group ds1621_group = {
	209	.attrs = ds1621_attributes,
	210	};
	211
1da177e4	212
70313eab JD	213	/* Return 0 if detection is successful, -ENODEV otherwise */
	214	static int ds1621_detect(struct i2c_client *client, int kind,
	215	struct i2c_board_info *info)
1da177e4	216	{
70313eab	217	struct i2c_adapter *adapter = client->adapter;
1da177e4	218	int conf, temp;
70313eab	219	int i;
1da177e4 LT	220
	221	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
	222	\| I2C_FUNC_SMBUS_WORD_DATA
	223	\| I2C_FUNC_SMBUS_WRITE_BYTE))
70313eab	224	return -ENODEV;
1da177e4 LT	225
	226	/* Now, we do the remaining detection. It is lousy. */
	227	if (kind < 0) {
	228	/* The NVB bit should be low if no EEPROM write has been
	229	requested during the latest 10ms, which is highly
	230	improbable in our case. */
75819f01	231	conf = ds1621_read_value(client, DS1621_REG_CONF);
1da177e4	232	if (conf & DS1621_REG_CONFIG_NVB)
70313eab	233	return -ENODEV;
1da177e4	234	/* The 7 lowest bits of a temperature should always be 0. */
70313eab	235	for (i = 0; i < ARRAY_SIZE(DS1621_REG_TEMP); i++) {
46a2e71c JD	236	temp = ds1621_read_value(client, DS1621_REG_TEMP[i]);
46a2e71c JD	237	if (temp & 0x007f)
70313eab	238	return -ENODEV;
46a2e71c	239	}
1da177e4 LT	240	}
1da177e4 LT	241
70313eab	242	strlcpy(info->type, "ds1621", I2C_NAME_SIZE);
1da177e4	243
70313eab JD	244	return 0;
	245	}
	246
	247	static int ds1621_probe(struct i2c_client *client,
	248	const struct i2c_device_id *id)
	249	{
	250	struct ds1621_data *data;
	251	int err;
	252
	253	data = kzalloc(sizeof(struct ds1621_data), GFP_KERNEL);
	254	if (!data) {
	255	err = -ENOMEM;
	256	goto exit;
	257	}
	258
	259	i2c_set_clientdata(client, data);
	260	mutex_init(&data->update_lock);
1da177e4 LT	261
1da177e4 LT	262	/* Initialize the DS1621 chip */
75819f01	263	ds1621_init_client(client);
1da177e4 LT	264
1da177e4 LT	265	/* Register sysfs hooks */
75819f01	266	if ((err = sysfs_create_group(&client->dev.kobj, &ds1621_group)))
70313eab	267	goto exit_free;
a5ebe668	268
1beeffe4 TJ	269	data->hwmon_dev = hwmon_device_register(&client->dev);
	270	if (IS_ERR(data->hwmon_dev)) {
	271	err = PTR_ERR(data->hwmon_dev);
a5ebe668	272	goto exit_remove_files;
943b0830 MH	273	}
943b0830 MH	274
1da177e4 LT	275	return 0;
1da177e4 LT	276
a5ebe668	277	exit_remove_files:
75819f01	278	sysfs_remove_group(&client->dev.kobj, &ds1621_group);
1da177e4 LT	279	exit_free:
	280	kfree(data);
	281	exit:
	282	return err;
	283	}
	284
70313eab	285	static int ds1621_remove(struct i2c_client *client)
1da177e4	286	{
943b0830	287	struct ds1621_data *data = i2c_get_clientdata(client);
1da177e4	288
1beeffe4	289	hwmon_device_unregister(data->hwmon_dev);
a5ebe668	290	sysfs_remove_group(&client->dev.kobj, &ds1621_group);
943b0830	291
943b0830	292	kfree(data);
1da177e4 LT	293
	294	return 0;
	295	}
	296
	297
	298	static struct ds1621_data ds1621_update_client(struct device dev)
	299	{
	300	struct i2c_client *client = to_i2c_client(dev);
	301	struct ds1621_data *data = i2c_get_clientdata(client);
	302	u8 new_conf;
	303
9a61bf63	304	mutex_lock(&data->update_lock);
1da177e4 LT	305
	306	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	307	\|\| !data->valid) {
46a2e71c	308	int i;
1da177e4 LT	309
	310	dev_dbg(&client->dev, "Starting ds1621 update\n");
	311
	312	data->conf = ds1621_read_value(client, DS1621_REG_CONF);
	313
46a2e71c JD	314	for (i = 0; i < ARRAY_SIZE(data->temp); i++)
	315	data->temp[i] = ds1621_read_value(client,
	316	DS1621_REG_TEMP[i]);
1da177e4	317
44bbe87e	318	/* reset alarms if necessary */
1da177e4	319	new_conf = data->conf;
46a2e71c	320	if (data->temp[0] > data->temp[1]) /* input > min */
1da177e4	321	new_conf &= ~DS1621_ALARM_TEMP_LOW;
46a2e71c	322	if (data->temp[0] < data->temp[2]) /* input < max */
1da177e4 LT	323	new_conf &= ~DS1621_ALARM_TEMP_HIGH;
	324	if (data->conf != new_conf)
	325	ds1621_write_value(client, DS1621_REG_CONF,
	326	new_conf);
	327
	328	data->last_updated = jiffies;
	329	data->valid = 1;
	330	}
	331
9a61bf63	332	mutex_unlock(&data->update_lock);
1da177e4 LT	333
	334	return data;
	335	}
	336
	337	static int __init ds1621_init(void)
	338	{
	339	return i2c_add_driver(&ds1621_driver);
	340	}
	341
	342	static void __exit ds1621_exit(void)
	343	{
	344	i2c_del_driver(&ds1621_driver);
	345	}
	346
	347
	348	MODULE_AUTHOR("Christian W. Zuckschwerdt <zany@triq.net>");
	349	MODULE_DESCRIPTION("DS1621 driver");
	350	MODULE_LICENSE("GPL");
	351
	352	module_init(ds1621_init);
	353	module_exit(ds1621_exit);