[mirror_ubuntu-jammy-kernel.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/err.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>
#include "lm75.h"

/* Addresses to scan */
static 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 */
#define DS1621_REG_TEMP			0xAA /* word, RO */
#define DS1621_REG_TEMP_MIN		0xA2 /* word, RW */
#define DS1621_REG_TEMP_MAX		0xA1 /* 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 i2c_client client;
	struct class_device *class_dev;
	struct mutex update_lock;
	char valid;			/* !=0 if following fields are valid */
	unsigned long last_updated;	/* In jiffies */

	u16 temp, temp_min, temp_max;	/* Register values, word */
	u8 conf;			/* Register encoding, combined */
};

static int ds1621_attach_adapter(struct i2c_adapter *adapter);
static int ds1621_detect(struct i2c_adapter *adapter, int address,
			 int kind);
static void ds1621_init_client(struct i2c_client *client);
static int ds1621_detach_client(struct i2c_client *client);
static struct ds1621_data *ds1621_update_client(struct device *dev);

/* This is the driver that will be inserted */
static struct i2c_driver ds1621_driver = {
	.driver = {
		.name	= "ds1621",
	},
	.id		= I2C_DRIVERID_DS1621,
	.attach_adapter	= ds1621_attach_adapter,
	.detach_client	= ds1621_detach_client,
};

/* 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);
}

#define show(value)							\
static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf)		\
{									\
	struct ds1621_data *data = ds1621_update_client(dev);		\
	return sprintf(buf, "%d\n", LM75_TEMP_FROM_REG(data->value));	\
}

show(temp);
show(temp_min);
show(temp_max);

#define set_temp(suffix, value, reg)					\
static ssize_t set_temp_##suffix(struct device *dev, struct device_attribute *attr, const char *buf,	\
				 size_t count)				\
{									\
	struct i2c_client *client = to_i2c_client(dev);			\
	struct ds1621_data *data = ds1621_update_client(dev);		\
	u16 val = LM75_TEMP_TO_REG(simple_strtoul(buf, NULL, 10));	\
									\
	mutex_lock(&data->update_lock);					\
	data->value = val;						\
	ds1621_write_value(client, reg, data->value);			\
	mutex_unlock(&data->update_lock);				\
	return count;							\
}

set_temp(min, temp_min, DS1621_REG_TEMP_MIN);
set_temp(max, temp_max, DS1621_REG_TEMP_MAX);

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

static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
static DEVICE_ATTR(temp1_input, S_IRUGO , show_temp, NULL);
static DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO , show_temp_min, set_temp_min);
static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, set_temp_max);

static struct attribute *ds1621_attributes[] = {
	&dev_attr_temp1_input.attr,
	&dev_attr_temp1_min.attr,
	&dev_attr_temp1_max.attr,
	&dev_attr_alarms.attr,
	NULL
};

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


static int ds1621_attach_adapter(struct i2c_adapter *adapter)
{
	if (!(adapter->class & I2C_CLASS_HWMON))
		return 0;
	return i2c_probe(adapter, &addr_data, ds1621_detect);
}

/* This function is called by i2c_probe */
static int ds1621_detect(struct i2c_adapter *adapter, int address,
			 int kind)
{
	int conf, temp;
	struct i2c_client *client;
	struct ds1621_data *data;
	int err = 0;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA 
				     | I2C_FUNC_SMBUS_WORD_DATA 
				     | I2C_FUNC_SMBUS_WRITE_BYTE))
		goto exit;

	/* OK. For now, we presume we have a valid client. We now create the
	   client structure, even though we cannot fill it completely yet.
	   But it allows us to access ds1621_{read,write}_value. */
	if (!(data = kzalloc(sizeof(struct ds1621_data), GFP_KERNEL))) {
		err = -ENOMEM;
		goto exit;
	}
	
	client = &data->client;
	i2c_set_clientdata(client, data);
	client->addr = address;
	client->adapter = adapter;
	client->driver = &ds1621_driver;

	/* 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)
			goto exit_free;
		/* The 7 lowest bits of a temperature should always be 0. */
		temp = ds1621_read_value(client, DS1621_REG_TEMP);
		if (temp & 0x007f)
			goto exit_free;
		temp = ds1621_read_value(client, DS1621_REG_TEMP_MIN);
		if (temp & 0x007f)
			goto exit_free;
		temp = ds1621_read_value(client, DS1621_REG_TEMP_MAX);
		if (temp & 0x007f)
			goto exit_free;
	}

	/* Fill in remaining client fields and put it into the global list */
	strlcpy(client->name, "ds1621", I2C_NAME_SIZE);
	mutex_init(&data->update_lock);

	/* Tell the I2C layer a new client has arrived */
	if ((err = i2c_attach_client(client)))
		goto exit_free;

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

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

	data->class_dev = hwmon_device_register(&client->dev);
	if (IS_ERR(data->class_dev)) {
		err = PTR_ERR(data->class_dev);
		goto exit_remove_files;
	}

	return 0;

      exit_remove_files:
	sysfs_remove_group(&client->dev.kobj, &ds1621_group);
      exit_detach:
	i2c_detach_client(client);
      exit_free:
	kfree(data);
      exit:
	return err;
}

static int ds1621_detach_client(struct i2c_client *client)
{
	struct ds1621_data *data = i2c_get_clientdata(client);
	int err;

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

	if ((err = i2c_detach_client(client)))
		return err;

	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) {

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

		data->conf = ds1621_read_value(client, DS1621_REG_CONF);

		data->temp = ds1621_read_value(client, DS1621_REG_TEMP);
		
		data->temp_min = ds1621_read_value(client,
		                                    DS1621_REG_TEMP_MIN);
		data->temp_max = ds1621_read_value(client,
						    DS1621_REG_TEMP_MAX);

		/* reset alarms if necessary */
		new_conf = data->conf;
		if (data->temp > data->temp_min)
			new_conf &= ~DS1621_ALARM_TEMP_LOW;
		if (data->temp < data->temp_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 MH	29	#include <linux/hwmon.h>
943b0830 MH	30	#include <linux/err.h>
9a61bf63	31	#include <linux/mutex.h>
a5ebe668	32	#include <linux/sysfs.h>
1da177e4 LT	33	#include "lm75.h"
	34
	35	/* Addresses to scan */
	36	static unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
	37	0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
1da177e4 LT	38
1da177e4 LT	39	/* Insmod parameters */
f4b50261	40	I2C_CLIENT_INSMOD_1(ds1621);
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 */
	55	#define DS1621_REG_TEMP 0xAA /* word, RO */
7574d7e9 JD	56	#define DS1621_REG_TEMP_MIN 0xA2 /* word, RW */
7574d7e9 JD	57	#define DS1621_REG_TEMP_MAX 0xA1 /* word, RW */
1da177e4 LT	58	#define DS1621_REG_CONF 0xAC /* byte, RW */
	59	#define DS1621_COM_START 0xEE /* no data */
	60	#define DS1621_COM_STOP 0x22 /* no data */
	61
	62	/* The DS1621 configuration register */
	63	#define DS1621_ALARM_TEMP_HIGH 0x40
	64	#define DS1621_ALARM_TEMP_LOW 0x20
	65
75819f01	66	/* Conversions */
1da177e4 LT	67	#define ALARMS_FROM_REG(val) ((val) & \
	68	(DS1621_ALARM_TEMP_HIGH \| DS1621_ALARM_TEMP_LOW))
	69
	70	/* Each client has this additional data */
	71	struct ds1621_data {
	72	struct i2c_client client;
943b0830	73	struct class_device *class_dev;
9a61bf63	74	struct mutex update_lock;
1da177e4 LT	75	char valid; /* !=0 if following fields are valid */
	76	unsigned long last_updated; /* In jiffies */
	77
	78	u16 temp, temp_min, temp_max; /* Register values, word */
	79	u8 conf; /* Register encoding, combined */
	80	};
	81
	82	static int ds1621_attach_adapter(struct i2c_adapter *adapter);
	83	static int ds1621_detect(struct i2c_adapter *adapter, int address,
	84	int kind);
	85	static void ds1621_init_client(struct i2c_client *client);
	86	static int ds1621_detach_client(struct i2c_client *client);
	87	static struct ds1621_data ds1621_update_client(struct device dev);
	88
	89	/* This is the driver that will be inserted */
	90	static struct i2c_driver ds1621_driver = {
cdaf7934	91	.driver = {
cdaf7934 LR	92	.name = "ds1621",
cdaf7934 LR	93	},
1da177e4	94	.id = I2C_DRIVERID_DS1621,
1da177e4 LT	95	.attach_adapter = ds1621_attach_adapter,
	96	.detach_client = ds1621_detach_client,
	97	};
	98
	99	/* All registers are word-sized, except for the configuration register.
	100	DS1621 uses a high-byte first convention, which is exactly opposite to
75819f01	101	the SMBus standard. */
1da177e4 LT	102	static int ds1621_read_value(struct i2c_client *client, u8 reg)
	103	{
	104	if (reg == DS1621_REG_CONF)
	105	return i2c_smbus_read_byte_data(client, reg);
	106	else
	107	return swab16(i2c_smbus_read_word_data(client, reg));
	108	}
	109
1da177e4 LT	110	static int ds1621_write_value(struct i2c_client *client, u8 reg, u16 value)
	111	{
	112	if (reg == DS1621_REG_CONF)
	113	return i2c_smbus_write_byte_data(client, reg, value);
	114	else
	115	return i2c_smbus_write_word_data(client, reg, swab16(value));
	116	}
	117
	118	static void ds1621_init_client(struct i2c_client *client)
	119	{
	120	int reg = ds1621_read_value(client, DS1621_REG_CONF);
44bbe87e	121	/* switch to continuous conversion mode */
1da177e4 LT	122	reg &= ~ DS1621_REG_CONFIG_1SHOT;
	123
	124	/* setup output polarity */
	125	if (polarity == 0)
	126	reg &= ~DS1621_REG_CONFIG_POLARITY;
	127	else if (polarity == 1)
	128	reg \|= DS1621_REG_CONFIG_POLARITY;
	129
	130	ds1621_write_value(client, DS1621_REG_CONF, reg);
	131
	132	/* start conversion */
	133	i2c_smbus_write_byte(client, DS1621_COM_START);
	134	}
	135
	136	#define show(value) \
30f74292	137	static ssize_t show_##value(struct device dev, struct device_attribute attr, char *buf) \
1da177e4 LT	138	{ \
	139	struct ds1621_data *data = ds1621_update_client(dev); \
	140	return sprintf(buf, "%d\n", LM75_TEMP_FROM_REG(data->value)); \
	141	}
	142
	143	show(temp);
	144	show(temp_min);
	145	show(temp_max);
	146
	147	#define set_temp(suffix, value, reg) \
30f74292	148	static ssize_t set_temp_##suffix(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 ds1621_data *data = ds1621_update_client(dev); \
	153	u16 val = LM75_TEMP_TO_REG(simple_strtoul(buf, NULL, 10)); \
	154	\
9a61bf63	155	mutex_lock(&data->update_lock); \
1da177e4 LT	156	data->value = val; \
1da177e4 LT	157	ds1621_write_value(client, reg, data->value); \
9a61bf63	158	mutex_unlock(&data->update_lock); \
1da177e4 LT	159	return count; \
	160	}
	161
	162	set_temp(min, temp_min, DS1621_REG_TEMP_MIN);
	163	set_temp(max, temp_max, DS1621_REG_TEMP_MAX);
	164
30f74292	165	static ssize_t show_alarms(struct device dev, struct device_attribute attr, char *buf)
1da177e4 LT	166	{
	167	struct ds1621_data *data = ds1621_update_client(dev);
	168	return sprintf(buf, "%d\n", ALARMS_FROM_REG(data->conf));
	169	}
	170
	171	static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
	172	static DEVICE_ATTR(temp1_input, S_IRUGO , show_temp, NULL);
	173	static DEVICE_ATTR(temp1_min, S_IWUSR \| S_IRUGO , show_temp_min, set_temp_min);
	174	static DEVICE_ATTR(temp1_max, S_IWUSR \| S_IRUGO, show_temp_max, set_temp_max);
	175
a5ebe668 JD	176	static struct attribute *ds1621_attributes[] = {
	177	&dev_attr_temp1_input.attr,
	178	&dev_attr_temp1_min.attr,
	179	&dev_attr_temp1_max.attr,
	180	&dev_attr_alarms.attr,
	181	NULL
	182	};
	183
	184	static const struct attribute_group ds1621_group = {
	185	.attrs = ds1621_attributes,
	186	};
	187
1da177e4 LT	188
	189	static int ds1621_attach_adapter(struct i2c_adapter *adapter)
	190	{
ddec748f JD	191	if (!(adapter->class & I2C_CLASS_HWMON))
ddec748f JD	192	return 0;
2ed2dc3c	193	return i2c_probe(adapter, &addr_data, ds1621_detect);
1da177e4 LT	194	}
1da177e4 LT	195
2ed2dc3c	196	/* This function is called by i2c_probe */
c49efcef BD	197	static int ds1621_detect(struct i2c_adapter *adapter, int address,
c49efcef BD	198	int kind)
1da177e4 LT	199	{
1da177e4 LT	200	int conf, temp;
75819f01	201	struct i2c_client *client;
1da177e4 LT	202	struct ds1621_data *data;
	203	int err = 0;
	204
	205	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
	206	\| I2C_FUNC_SMBUS_WORD_DATA
	207	\| I2C_FUNC_SMBUS_WRITE_BYTE))
	208	goto exit;
	209
	210	/* OK. For now, we presume we have a valid client. We now create the
	211	client structure, even though we cannot fill it completely yet.
	212	But it allows us to access ds1621_{read,write}_value. */
ba9c2e8d	213	if (!(data = kzalloc(sizeof(struct ds1621_data), GFP_KERNEL))) {
1da177e4 LT	214	err = -ENOMEM;
	215	goto exit;
	216	}
1da177e4	217
75819f01 JD	218	client = &data->client;
	219	i2c_set_clientdata(client, data);
	220	client->addr = address;
	221	client->adapter = adapter;
	222	client->driver = &ds1621_driver;
1da177e4 LT	223
	224	/* Now, we do the remaining detection. It is lousy. */
	225	if (kind < 0) {
	226	/* The NVB bit should be low if no EEPROM write has been
	227	requested during the latest 10ms, which is highly
	228	improbable in our case. */
75819f01	229	conf = ds1621_read_value(client, DS1621_REG_CONF);
1da177e4 LT	230	if (conf & DS1621_REG_CONFIG_NVB)
	231	goto exit_free;
	232	/* The 7 lowest bits of a temperature should always be 0. */
75819f01	233	temp = ds1621_read_value(client, DS1621_REG_TEMP);
1da177e4 LT	234	if (temp & 0x007f)
1da177e4 LT	235	goto exit_free;
75819f01	236	temp = ds1621_read_value(client, DS1621_REG_TEMP_MIN);
1da177e4 LT	237	if (temp & 0x007f)
1da177e4 LT	238	goto exit_free;
75819f01	239	temp = ds1621_read_value(client, DS1621_REG_TEMP_MAX);
1da177e4 LT	240	if (temp & 0x007f)
	241	goto exit_free;
	242	}
	243
1da177e4	244	/* Fill in remaining client fields and put it into the global list */
75819f01	245	strlcpy(client->name, "ds1621", I2C_NAME_SIZE);
9a61bf63	246	mutex_init(&data->update_lock);
1da177e4 LT	247
1da177e4 LT	248	/* Tell the I2C layer a new client has arrived */
75819f01	249	if ((err = i2c_attach_client(client)))
1da177e4 LT	250	goto exit_free;
	251
	252	/* Initialize the DS1621 chip */
75819f01	253	ds1621_init_client(client);
1da177e4 LT	254
1da177e4 LT	255	/* Register sysfs hooks */
75819f01	256	if ((err = sysfs_create_group(&client->dev.kobj, &ds1621_group)))
a5ebe668 JD	257	goto exit_detach;
a5ebe668 JD	258
75819f01	259	data->class_dev = hwmon_device_register(&client->dev);
943b0830 MH	260	if (IS_ERR(data->class_dev)) {
943b0830 MH	261	err = PTR_ERR(data->class_dev);
a5ebe668	262	goto exit_remove_files;
943b0830 MH	263	}
943b0830 MH	264
1da177e4 LT	265	return 0;
1da177e4 LT	266
a5ebe668	267	exit_remove_files:
75819f01	268	sysfs_remove_group(&client->dev.kobj, &ds1621_group);
943b0830	269	exit_detach:
75819f01	270	i2c_detach_client(client);
1da177e4 LT	271	exit_free:
	272	kfree(data);
	273	exit:
	274	return err;
	275	}
	276
	277	static int ds1621_detach_client(struct i2c_client *client)
	278	{
943b0830	279	struct ds1621_data *data = i2c_get_clientdata(client);
1da177e4 LT	280	int err;
1da177e4 LT	281
943b0830	282	hwmon_device_unregister(data->class_dev);
a5ebe668	283	sysfs_remove_group(&client->dev.kobj, &ds1621_group);
943b0830	284
7bef5594	285	if ((err = i2c_detach_client(client)))
1da177e4	286	return err;
1da177e4	287
943b0830	288	kfree(data);
1da177e4 LT	289
	290	return 0;
	291	}
	292
	293
	294	static struct ds1621_data ds1621_update_client(struct device dev)
	295	{
	296	struct i2c_client *client = to_i2c_client(dev);
	297	struct ds1621_data *data = i2c_get_clientdata(client);
	298	u8 new_conf;
	299
9a61bf63	300	mutex_lock(&data->update_lock);
1da177e4 LT	301
	302	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	303	\|\| !data->valid) {
	304
	305	dev_dbg(&client->dev, "Starting ds1621 update\n");
	306
	307	data->conf = ds1621_read_value(client, DS1621_REG_CONF);
	308
	309	data->temp = ds1621_read_value(client, DS1621_REG_TEMP);
	310
	311	data->temp_min = ds1621_read_value(client,
	312	DS1621_REG_TEMP_MIN);
	313	data->temp_max = ds1621_read_value(client,
	314	DS1621_REG_TEMP_MAX);
	315
44bbe87e	316	/* reset alarms if necessary */
1da177e4	317	new_conf = data->conf;
7574d7e9	318	if (data->temp > data->temp_min)
1da177e4	319	new_conf &= ~DS1621_ALARM_TEMP_LOW;
7574d7e9	320	if (data->temp < data->temp_max)
1da177e4 LT	321	new_conf &= ~DS1621_ALARM_TEMP_HIGH;
	322	if (data->conf != new_conf)
	323	ds1621_write_value(client, DS1621_REG_CONF,
	324	new_conf);
	325
	326	data->last_updated = jiffies;
	327	data->valid = 1;
	328	}
	329
9a61bf63	330	mutex_unlock(&data->update_lock);
1da177e4 LT	331
	332	return data;
	333	}
	334
	335	static int __init ds1621_init(void)
	336	{
	337	return i2c_add_driver(&ds1621_driver);
	338	}
	339
	340	static void __exit ds1621_exit(void)
	341	{
	342	i2c_del_driver(&ds1621_driver);
	343	}
	344
	345
	346	MODULE_AUTHOR("Christian W. Zuckschwerdt <zany@triq.net>");
	347	MODULE_DESCRIPTION("DS1621 driver");
	348	MODULE_LICENSE("GPL");
	349
	350	module_init(ds1621_init);
	351	module_exit(ds1621_exit);