[net-next-2.6.git] / drivers / hwmon / lm83.c

/*
 * lm83.c - Part of lm_sensors, Linux kernel modules for hardware
 *          monitoring
 * Copyright (C) 2003-2009  Jean Delvare <khali@linux-fr.org>
 *
 * Heavily inspired from the lm78, lm75 and adm1021 drivers. The LM83 is
 * a sensor chip made by National Semiconductor. It reports up to four
 * temperatures (its own plus up to three external ones) with a 1 deg
 * resolution and a 3-4 deg accuracy. Complete datasheet can be obtained
 * from National's website at:
 *   http://www.national.com/pf/LM/LM83.html
 * Since the datasheet omits to give the chip stepping code, I give it
 * here: 0x03 (at register 0xff).
 *
 * Also supports the LM82 temp sensor, which is basically a stripped down
 * model of the LM83.  Datasheet is here:
 * http://www.national.com/pf/LM/LM82.html
 *
 * 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-sysfs.h>
#include <linux/hwmon.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>

/*
 * Addresses to scan
 * Address is selected using 2 three-level pins, resulting in 9 possible
 * addresses.
 */

static const unsigned short normal_i2c[] = {
	0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };

enum chips { lm83, lm82 };

/*
 * The LM83 registers
 * Manufacturer ID is 0x01 for National Semiconductor.
 */

#define LM83_REG_R_MAN_ID		0xFE
#define LM83_REG_R_CHIP_ID		0xFF
#define LM83_REG_R_CONFIG		0x03
#define LM83_REG_W_CONFIG		0x09
#define LM83_REG_R_STATUS1		0x02
#define LM83_REG_R_STATUS2		0x35
#define LM83_REG_R_LOCAL_TEMP		0x00
#define LM83_REG_R_LOCAL_HIGH		0x05
#define LM83_REG_W_LOCAL_HIGH		0x0B
#define LM83_REG_R_REMOTE1_TEMP		0x30
#define LM83_REG_R_REMOTE1_HIGH		0x38
#define LM83_REG_W_REMOTE1_HIGH		0x50
#define LM83_REG_R_REMOTE2_TEMP		0x01
#define LM83_REG_R_REMOTE2_HIGH		0x07
#define LM83_REG_W_REMOTE2_HIGH		0x0D
#define LM83_REG_R_REMOTE3_TEMP		0x31
#define LM83_REG_R_REMOTE3_HIGH		0x3A
#define LM83_REG_W_REMOTE3_HIGH		0x52
#define LM83_REG_R_TCRIT		0x42
#define LM83_REG_W_TCRIT		0x5A

/*
 * Conversions and various macros
 * The LM83 uses signed 8-bit values with LSB = 1 degree Celsius.
 */

#define TEMP_FROM_REG(val)	((val) * 1000)
#define TEMP_TO_REG(val)	((val) <= -128000 ? -128 : \
				 (val) >= 127000 ? 127 : \
				 (val) < 0 ? ((val) - 500) / 1000 : \
				 ((val) + 500) / 1000)

static const u8 LM83_REG_R_TEMP[] = {
	LM83_REG_R_LOCAL_TEMP,
	LM83_REG_R_REMOTE1_TEMP,
	LM83_REG_R_REMOTE2_TEMP,
	LM83_REG_R_REMOTE3_TEMP,
	LM83_REG_R_LOCAL_HIGH,
	LM83_REG_R_REMOTE1_HIGH,
	LM83_REG_R_REMOTE2_HIGH,
	LM83_REG_R_REMOTE3_HIGH,
	LM83_REG_R_TCRIT,
};

static const u8 LM83_REG_W_HIGH[] = {
	LM83_REG_W_LOCAL_HIGH,
	LM83_REG_W_REMOTE1_HIGH,
	LM83_REG_W_REMOTE2_HIGH,
	LM83_REG_W_REMOTE3_HIGH,
	LM83_REG_W_TCRIT,
};

/*
 * Functions declaration
 */

static int lm83_detect(struct i2c_client *new_client,
		       struct i2c_board_info *info);
static int lm83_probe(struct i2c_client *client,
		      const struct i2c_device_id *id);
static int lm83_remove(struct i2c_client *client);
static struct lm83_data *lm83_update_device(struct device *dev);

/*
 * Driver data (common to all clients)
 */
 
static const struct i2c_device_id lm83_id[] = {
	{ "lm83", lm83 },
	{ "lm82", lm82 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, lm83_id);

static struct i2c_driver lm83_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "lm83",
	},
	.probe		= lm83_probe,
	.remove		= lm83_remove,
	.id_table	= lm83_id,
	.detect		= lm83_detect,
	.address_list	= normal_i2c,
};

/*
 * Client data (each client gets its own)
 */

struct lm83_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 */
	s8 temp[9];	/* 0..3: input 1-4,
			   4..7: high limit 1-4,
			   8   : critical limit */
	u16 alarms; /* bitvector, combined */
};

/*
 * Sysfs stuff
 */

static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
			 char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct lm83_data *data = lm83_update_device(dev);
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
}

static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,
			const char *buf, size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct i2c_client *client = to_i2c_client(dev);
	struct lm83_data *data = i2c_get_clientdata(client);
	long val = simple_strtol(buf, NULL, 10);
	int nr = attr->index;

	mutex_lock(&data->update_lock);
	data->temp[nr] = TEMP_TO_REG(val);
	i2c_smbus_write_byte_data(client, LM83_REG_W_HIGH[nr - 4],
				  data->temp[nr]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy,
			   char *buf)
{
	struct lm83_data *data = lm83_update_device(dev);
	return sprintf(buf, "%d\n", data->alarms);
}

static ssize_t show_alarm(struct device *dev, struct device_attribute
			  *devattr, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct lm83_data *data = lm83_update_device(dev);
	int bitnr = attr->index;

	return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
}

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp,
	set_temp, 4);
static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp,
	set_temp, 5);
static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_temp,
	set_temp, 6);
static SENSOR_DEVICE_ATTR(temp4_max, S_IWUSR | S_IRUGO, show_temp,
	set_temp, 7);
static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL, 8);
static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp, NULL, 8);
static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO, show_temp,
	set_temp, 8);
static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO, show_temp, NULL, 8);

/* Individual alarm files */
static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0);
static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2);
static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 4);
static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 8);
static SENSOR_DEVICE_ATTR(temp4_crit_alarm, S_IRUGO, show_alarm, NULL, 9);
static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_alarm, NULL, 10);
static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 12);
static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 13);
static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 15);
/* Raw alarm file for compatibility */
static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);

static struct attribute *lm83_attributes[] = {
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp3_input.dev_attr.attr,
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp3_max.dev_attr.attr,
	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	&sensor_dev_attr_temp3_crit.dev_attr.attr,

	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp3_fault.dev_attr.attr,
	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	&dev_attr_alarms.attr,
	NULL
};

static const struct attribute_group lm83_group = {
	.attrs = lm83_attributes,
};

static struct attribute *lm83_attributes_opt[] = {
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp4_input.dev_attr.attr,
	&sensor_dev_attr_temp2_max.dev_attr.attr,
	&sensor_dev_attr_temp4_max.dev_attr.attr,
	&sensor_dev_attr_temp2_crit.dev_attr.attr,
	&sensor_dev_attr_temp4_crit.dev_attr.attr,

	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp4_fault.dev_attr.attr,
	&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_fault.dev_attr.attr,
	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	NULL
};

static const struct attribute_group lm83_group_opt = {
	.attrs = lm83_attributes_opt,
};

/*
 * Real code
 */

/* Return 0 if detection is successful, -ENODEV otherwise */
static int lm83_detect(struct i2c_client *new_client,
		       struct i2c_board_info *info)
{
	struct i2c_adapter *adapter = new_client->adapter;
	const char *name;
	u8 man_id, chip_id;

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

	/* Detection */
	if ((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS1) & 0xA8) ||
	    (i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS2) & 0x48) ||
	    (i2c_smbus_read_byte_data(new_client, LM83_REG_R_CONFIG) & 0x41)) {
		dev_dbg(&adapter->dev, "LM83 detection failed at 0x%02x\n",
			new_client->addr);
		return -ENODEV;
	}

	/* Identification */
	man_id = i2c_smbus_read_byte_data(new_client, LM83_REG_R_MAN_ID);
	if (man_id != 0x01)	/* National Semiconductor */
		return -ENODEV;

	chip_id = i2c_smbus_read_byte_data(new_client, LM83_REG_R_CHIP_ID);
	switch (chip_id) {
	case 0x03:
		name = "lm83";
		break;
	case 0x01:
		name = "lm82";
		break;
	default:
		/* 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, name, I2C_NAME_SIZE);

	return 0;
}

static int lm83_probe(struct i2c_client *new_client,
		      const struct i2c_device_id *id)
{
	struct lm83_data *data;
	int err;

	data = kzalloc(sizeof(struct lm83_data), GFP_KERNEL);
	if (!data) {
		err = -ENOMEM;
		goto exit;
	}

	i2c_set_clientdata(new_client, data);
	data->valid = 0;
	mutex_init(&data->update_lock);

	/*
	 * Register sysfs hooks
	 * The LM82 can only monitor one external diode which is
	 * at the same register as the LM83 temp3 entry - so we
	 * declare 1 and 3 common, and then 2 and 4 only for the LM83.
	 */

	if ((err = sysfs_create_group(&new_client->dev.kobj, &lm83_group)))
		goto exit_free;

	if (id->driver_data == lm83) {
		if ((err = sysfs_create_group(&new_client->dev.kobj,
					      &lm83_group_opt)))
			goto exit_remove_files;
	}

	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, &lm83_group);
	sysfs_remove_group(&new_client->dev.kobj, &lm83_group_opt);
exit_free:
	kfree(data);
exit:
	return err;
}

static int lm83_remove(struct i2c_client *client)
{
	struct lm83_data *data = i2c_get_clientdata(client);

	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&client->dev.kobj, &lm83_group);
	sysfs_remove_group(&client->dev.kobj, &lm83_group_opt);

	kfree(data);
	return 0;
}

static struct lm83_data *lm83_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm83_data *data = i2c_get_clientdata(client);

	mutex_lock(&data->update_lock);

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

		dev_dbg(&client->dev, "Updating lm83 data.\n");
		for (nr = 0; nr < 9; nr++) {
			data->temp[nr] =
			    i2c_smbus_read_byte_data(client,
			    LM83_REG_R_TEMP[nr]);
		}
		data->alarms =
		    i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS1)
		    + (i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS2)
		    << 8);

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

	mutex_unlock(&data->update_lock);

	return data;
}

static int __init sensors_lm83_init(void)
{
	return i2c_add_driver(&lm83_driver);
}

static void __exit sensors_lm83_exit(void)
{
	i2c_del_driver(&lm83_driver);
}

MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
MODULE_DESCRIPTION("LM83 driver");
MODULE_LICENSE("GPL");

module_init(sensors_lm83_init);
module_exit(sensors_lm83_exit);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* lm83.c - Part of lm_sensors, Linux kernel modules for hardware
	3	* monitoring
b57dc394	4	* Copyright (C) 2003-2009 Jean Delvare <khali@linux-fr.org>
1da177e4 LT	5	*
	6	* Heavily inspired from the lm78, lm75 and adm1021 drivers. The LM83 is
	7	* a sensor chip made by National Semiconductor. It reports up to four
	8	* temperatures (its own plus up to three external ones) with a 1 deg
	9	* resolution and a 3-4 deg accuracy. Complete datasheet can be obtained
	10	* from National's website at:
	11	* http://www.national.com/pf/LM/LM83.html
	12	* Since the datasheet omits to give the chip stepping code, I give it
	13	* here: 0x03 (at register 0xff).
	14	*
43cb7ebe JC	15	* Also supports the LM82 temp sensor, which is basically a stripped down
	16	* model of the LM83. Datasheet is here:
	17	* http://www.national.com/pf/LM/LM82.html
	18	*
1da177e4 LT	19	* This program is free software; you can redistribute it and/or modify
	20	* it under the terms of the GNU General Public License as published by
	21	* the Free Software Foundation; either version 2 of the License, or
	22	* (at your option) any later version.
	23	*
	24	* This program is distributed in the hope that it will be useful,
	25	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	26	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	27	* GNU General Public License for more details.
	28	*
	29	* You should have received a copy of the GNU General Public License
	30	* along with this program; if not, write to the Free Software
	31	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	32	*/
	33
1da177e4 LT	34	#include <linux/module.h>
	35	#include <linux/init.h>
	36	#include <linux/slab.h>
	37	#include <linux/jiffies.h>
	38	#include <linux/i2c.h>
10c08f81	39	#include <linux/hwmon-sysfs.h>
943b0830 MH	40	#include <linux/hwmon.h>
943b0830 MH	41	#include <linux/err.h>
9a61bf63	42	#include <linux/mutex.h>
0e39e01c	43	#include <linux/sysfs.h>
1da177e4 LT	44
	45	/*
	46	* Addresses to scan
	47	* Address is selected using 2 three-level pins, resulting in 9 possible
	48	* addresses.
	49	*/
	50
25e9c86d MH	51	static const unsigned short normal_i2c[] = {
25e9c86d MH	52	0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
1da177e4	53
e5e9f44c	54	enum chips { lm83, lm82 };
1da177e4 LT	55
	56	/*
	57	* The LM83 registers
	58	* Manufacturer ID is 0x01 for National Semiconductor.
	59	*/
	60
	61	#define LM83_REG_R_MAN_ID 0xFE
	62	#define LM83_REG_R_CHIP_ID 0xFF
	63	#define LM83_REG_R_CONFIG 0x03
	64	#define LM83_REG_W_CONFIG 0x09
	65	#define LM83_REG_R_STATUS1 0x02
	66	#define LM83_REG_R_STATUS2 0x35
	67	#define LM83_REG_R_LOCAL_TEMP 0x00
	68	#define LM83_REG_R_LOCAL_HIGH 0x05
	69	#define LM83_REG_W_LOCAL_HIGH 0x0B
	70	#define LM83_REG_R_REMOTE1_TEMP 0x30
	71	#define LM83_REG_R_REMOTE1_HIGH 0x38
	72	#define LM83_REG_W_REMOTE1_HIGH 0x50
	73	#define LM83_REG_R_REMOTE2_TEMP 0x01
	74	#define LM83_REG_R_REMOTE2_HIGH 0x07
	75	#define LM83_REG_W_REMOTE2_HIGH 0x0D
	76	#define LM83_REG_R_REMOTE3_TEMP 0x31
	77	#define LM83_REG_R_REMOTE3_HIGH 0x3A
	78	#define LM83_REG_W_REMOTE3_HIGH 0x52
	79	#define LM83_REG_R_TCRIT 0x42
	80	#define LM83_REG_W_TCRIT 0x5A
	81
	82	/*
	83	* Conversions and various macros
44bbe87e	84	* The LM83 uses signed 8-bit values with LSB = 1 degree Celsius.
1da177e4 LT	85	*/
	86
	87	#define TEMP_FROM_REG(val) ((val) * 1000)
	88	#define TEMP_TO_REG(val) ((val) <= -128000 ? -128 : \
	89	(val) >= 127000 ? 127 : \
	90	(val) < 0 ? ((val) - 500) / 1000 : \
	91	((val) + 500) / 1000)
	92
	93	static const u8 LM83_REG_R_TEMP[] = {
	94	LM83_REG_R_LOCAL_TEMP,
	95	LM83_REG_R_REMOTE1_TEMP,
	96	LM83_REG_R_REMOTE2_TEMP,
1a86c051	97	LM83_REG_R_REMOTE3_TEMP,
1da177e4 LT	98	LM83_REG_R_LOCAL_HIGH,
	99	LM83_REG_R_REMOTE1_HIGH,
	100	LM83_REG_R_REMOTE2_HIGH,
1a86c051 JD	101	LM83_REG_R_REMOTE3_HIGH,
1a86c051 JD	102	LM83_REG_R_TCRIT,
1da177e4 LT	103	};
	104
	105	static const u8 LM83_REG_W_HIGH[] = {
	106	LM83_REG_W_LOCAL_HIGH,
	107	LM83_REG_W_REMOTE1_HIGH,
	108	LM83_REG_W_REMOTE2_HIGH,
1a86c051 JD	109	LM83_REG_W_REMOTE3_HIGH,
1a86c051 JD	110	LM83_REG_W_TCRIT,
1da177e4 LT	111	};
	112
	113	/*
	114	* Functions declaration
	115	*/
	116
310ec792	117	static int lm83_detect(struct i2c_client *new_client,
b6aacdce JD	118	struct i2c_board_info *info);
	119	static int lm83_probe(struct i2c_client *client,
	120	const struct i2c_device_id *id);
	121	static int lm83_remove(struct i2c_client *client);
1da177e4 LT	122	static struct lm83_data lm83_update_device(struct device dev);
	123
	124	/*
	125	* Driver data (common to all clients)
	126	*/
	127
b6aacdce JD	128	static const struct i2c_device_id lm83_id[] = {
	129	{ "lm83", lm83 },
	130	{ "lm82", lm82 },
	131	{ }
	132	};
	133	MODULE_DEVICE_TABLE(i2c, lm83_id);
	134
1da177e4	135	static struct i2c_driver lm83_driver = {
b6aacdce	136	.class = I2C_CLASS_HWMON,
cdaf7934	137	.driver = {
cdaf7934 LR	138	.name = "lm83",
cdaf7934 LR	139	},
b6aacdce JD	140	.probe = lm83_probe,
	141	.remove = lm83_remove,
	142	.id_table = lm83_id,
	143	.detect = lm83_detect,
c3813d6a	144	.address_list = normal_i2c,
1da177e4 LT	145	};
	146
	147	/*
	148	* Client data (each client gets its own)
	149	*/
	150
	151	struct lm83_data {
1beeffe4	152	struct device *hwmon_dev;
9a61bf63	153	struct mutex update_lock;
1da177e4 LT	154	char valid; /* zero until following fields are valid */
	155	unsigned long last_updated; /* in jiffies */
	156
	157	/* registers values */
1a86c051 JD	158	s8 temp[9]; /* 0..3: input 1-4,
	159	4..7: high limit 1-4,
	160	8 : critical limit */
1da177e4 LT	161	u16 alarms; /* bitvector, combined */
	162	};
	163
	164	/*
	165	* Sysfs stuff
	166	*/
	167
1a86c051 JD	168	static ssize_t show_temp(struct device dev, struct device_attribute devattr,
	169	char *buf)
	170	{
	171	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	172	struct lm83_data *data = lm83_update_device(dev);
	173	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
1da177e4	174	}
1a86c051 JD	175
	176	static ssize_t set_temp(struct device dev, struct device_attribute devattr,
	177	const char *buf, size_t count)
	178	{
	179	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	180	struct i2c_client *client = to_i2c_client(dev);
	181	struct lm83_data *data = i2c_get_clientdata(client);
	182	long val = simple_strtol(buf, NULL, 10);
	183	int nr = attr->index;
	184
9a61bf63	185	mutex_lock(&data->update_lock);
1a86c051 JD	186	data->temp[nr] = TEMP_TO_REG(val);
	187	i2c_smbus_write_byte_data(client, LM83_REG_W_HIGH[nr - 4],
	188	data->temp[nr]);
9a61bf63	189	mutex_unlock(&data->update_lock);
1a86c051	190	return count;
1da177e4	191	}
1da177e4	192
1a86c051 JD	193	static ssize_t show_alarms(struct device dev, struct device_attribute dummy,
1a86c051 JD	194	char *buf)
1da177e4 LT	195	{
	196	struct lm83_data *data = lm83_update_device(dev);
	197	return sprintf(buf, "%d\n", data->alarms);
	198	}
	199
2d45771e JD	200	static ssize_t show_alarm(struct device *dev, struct device_attribute
	201	devattr, char buf)
	202	{
	203	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	204	struct lm83_data *data = lm83_update_device(dev);
	205	int bitnr = attr->index;
	206
	207	return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
	208	}
	209
1a86c051 JD	210	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
	211	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
	212	static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
	213	static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
	214	static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR \| S_IRUGO, show_temp,
	215	set_temp, 4);
	216	static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR \| S_IRUGO, show_temp,
	217	set_temp, 5);
	218	static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR \| S_IRUGO, show_temp,
	219	set_temp, 6);
	220	static SENSOR_DEVICE_ATTR(temp4_max, S_IWUSR \| S_IRUGO, show_temp,
	221	set_temp, 7);
	222	static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL, 8);
	223	static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp, NULL, 8);
	224	static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR \| S_IRUGO, show_temp,
	225	set_temp, 8);
	226	static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO, show_temp, NULL, 8);
2d45771e JD	227
	228	/* Individual alarm files */
	229	static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0);
	230	static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
7817a39e	231	static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2);
2d45771e JD	232	static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 4);
	233	static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
	234	static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 8);
	235	static SENSOR_DEVICE_ATTR(temp4_crit_alarm, S_IRUGO, show_alarm, NULL, 9);
7817a39e	236	static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_alarm, NULL, 10);
2d45771e	237	static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 12);
7817a39e	238	static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 13);
2d45771e JD	239	static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 15);
2d45771e JD	240	/* Raw alarm file for compatibility */
1da177e4 LT	241	static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
1da177e4 LT	242
0e39e01c JD	243	static struct attribute *lm83_attributes[] = {
	244	&sensor_dev_attr_temp1_input.dev_attr.attr,
	245	&sensor_dev_attr_temp3_input.dev_attr.attr,
	246	&sensor_dev_attr_temp1_max.dev_attr.attr,
	247	&sensor_dev_attr_temp3_max.dev_attr.attr,
	248	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	249	&sensor_dev_attr_temp3_crit.dev_attr.attr,
	250
	251	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	252	&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
7817a39e	253	&sensor_dev_attr_temp3_fault.dev_attr.attr,
0e39e01c JD	254	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
	255	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	256	&dev_attr_alarms.attr,
	257	NULL
	258	};
	259
	260	static const struct attribute_group lm83_group = {
	261	.attrs = lm83_attributes,
	262	};
	263
	264	static struct attribute *lm83_attributes_opt[] = {
	265	&sensor_dev_attr_temp2_input.dev_attr.attr,
	266	&sensor_dev_attr_temp4_input.dev_attr.attr,
	267	&sensor_dev_attr_temp2_max.dev_attr.attr,
	268	&sensor_dev_attr_temp4_max.dev_attr.attr,
	269	&sensor_dev_attr_temp2_crit.dev_attr.attr,
	270	&sensor_dev_attr_temp4_crit.dev_attr.attr,
	271
	272	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	273	&sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
7817a39e	274	&sensor_dev_attr_temp4_fault.dev_attr.attr,
0e39e01c	275	&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
7817a39e	276	&sensor_dev_attr_temp2_fault.dev_attr.attr,
0e39e01c JD	277	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	278	NULL
	279	};
	280
	281	static const struct attribute_group lm83_group_opt = {
	282	.attrs = lm83_attributes_opt,
	283	};
	284
1da177e4 LT	285	/*
	286	* Real code
	287	*/
	288
b6aacdce	289	/* Return 0 if detection is successful, -ENODEV otherwise */
310ec792	290	static int lm83_detect(struct i2c_client *new_client,
b6aacdce	291	struct i2c_board_info *info)
1da177e4	292	{
b6aacdce	293	struct i2c_adapter *adapter = new_client->adapter;
b57dc394 JD	294	const char *name;
b57dc394 JD	295	u8 man_id, chip_id;
1da177e4 LT	296
1da177e4 LT	297	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
b6aacdce	298	return -ENODEV;
1da177e4	299
b57dc394 JD	300	/* Detection */
	301	if ((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS1) & 0xA8) \|\|
	302	(i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS2) & 0x48) \|\|
	303	(i2c_smbus_read_byte_data(new_client, LM83_REG_R_CONFIG) & 0x41)) {
	304	dev_dbg(&adapter->dev, "LM83 detection failed at 0x%02x\n",
	305	new_client->addr);
	306	return -ENODEV;
1da177e4 LT	307	}
1da177e4 LT	308
b57dc394 JD	309	/* Identification */
	310	man_id = i2c_smbus_read_byte_data(new_client, LM83_REG_R_MAN_ID);
	311	if (man_id != 0x01) /* National Semiconductor */
	312	return -ENODEV;
1da177e4	313
b57dc394 JD	314	chip_id = i2c_smbus_read_byte_data(new_client, LM83_REG_R_CHIP_ID);
	315	switch (chip_id) {
	316	case 0x03:
1da177e4	317	name = "lm83";
b57dc394 JD	318	break;
b57dc394 JD	319	case 0x01:
43cb7ebe	320	name = "lm82";
b57dc394 JD	321	break;
	322	default:
	323	/* identification failed */
	324	dev_info(&adapter->dev,
	325	"Unsupported chip (man_id=0x%02X, chip_id=0x%02X)\n",
	326	man_id, chip_id);
	327	return -ENODEV;
1da177e4 LT	328	}
1da177e4 LT	329
b6aacdce JD	330	strlcpy(info->type, name, I2C_NAME_SIZE);
	331
	332	return 0;
	333	}
	334
	335	static int lm83_probe(struct i2c_client *new_client,
	336	const struct i2c_device_id *id)
	337	{
	338	struct lm83_data *data;
	339	int err;
	340
	341	data = kzalloc(sizeof(struct lm83_data), GFP_KERNEL);
	342	if (!data) {
	343	err = -ENOMEM;
	344	goto exit;
	345	}
	346
	347	i2c_set_clientdata(new_client, data);
1da177e4	348	data->valid = 0;
9a61bf63	349	mutex_init(&data->update_lock);
1da177e4	350
1da177e4	351	/*
0e39e01c	352	* Register sysfs hooks
43cb7ebe JC	353	* The LM82 can only monitor one external diode which is
	354	* at the same register as the LM83 temp3 entry - so we
	355	* declare 1 and 3 common, and then 2 and 4 only for the LM83.
	356	*/
	357
0e39e01c	358	if ((err = sysfs_create_group(&new_client->dev.kobj, &lm83_group)))
b6aacdce	359	goto exit_free;
1da177e4	360
b6aacdce	361	if (id->driver_data == lm83) {
0e39e01c JD	362	if ((err = sysfs_create_group(&new_client->dev.kobj,
	363	&lm83_group_opt)))
	364	goto exit_remove_files;
	365	}
	366
1beeffe4 TJ	367	data->hwmon_dev = hwmon_device_register(&new_client->dev);
	368	if (IS_ERR(data->hwmon_dev)) {
	369	err = PTR_ERR(data->hwmon_dev);
0e39e01c	370	goto exit_remove_files;
43cb7ebe JC	371	}
43cb7ebe JC	372
1da177e4 LT	373	return 0;
1da177e4 LT	374
0e39e01c JD	375	exit_remove_files:
	376	sysfs_remove_group(&new_client->dev.kobj, &lm83_group);
	377	sysfs_remove_group(&new_client->dev.kobj, &lm83_group_opt);
1da177e4 LT	378	exit_free:
	379	kfree(data);
	380	exit:
	381	return err;
	382	}
	383
b6aacdce	384	static int lm83_remove(struct i2c_client *client)
1da177e4	385	{
943b0830	386	struct lm83_data *data = i2c_get_clientdata(client);
1da177e4	387
1beeffe4	388	hwmon_device_unregister(data->hwmon_dev);
0e39e01c JD	389	sysfs_remove_group(&client->dev.kobj, &lm83_group);
0e39e01c JD	390	sysfs_remove_group(&client->dev.kobj, &lm83_group_opt);
943b0830	391
943b0830	392	kfree(data);
1da177e4 LT	393	return 0;
	394	}
	395
	396	static struct lm83_data lm83_update_device(struct device dev)
	397	{
	398	struct i2c_client *client = to_i2c_client(dev);
	399	struct lm83_data *data = i2c_get_clientdata(client);
	400
9a61bf63	401	mutex_lock(&data->update_lock);
1da177e4 LT	402
	403	if (time_after(jiffies, data->last_updated + HZ * 2) \|\| !data->valid) {
	404	int nr;
	405
	406	dev_dbg(&client->dev, "Updating lm83 data.\n");
1a86c051 JD	407	for (nr = 0; nr < 9; nr++) {
1a86c051 JD	408	data->temp[nr] =
1da177e4 LT	409	i2c_smbus_read_byte_data(client,
1da177e4 LT	410	LM83_REG_R_TEMP[nr]);
1da177e4	411	}
1da177e4 LT	412	data->alarms =
	413	i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS1)
	414	+ (i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS2)
	415	<< 8);
	416
	417	data->last_updated = jiffies;
	418	data->valid = 1;
	419	}
	420
9a61bf63	421	mutex_unlock(&data->update_lock);
1da177e4 LT	422
	423	return data;
	424	}
	425
	426	static int __init sensors_lm83_init(void)
	427	{
	428	return i2c_add_driver(&lm83_driver);
	429	}
	430
	431	static void __exit sensors_lm83_exit(void)
	432	{
	433	i2c_del_driver(&lm83_driver);
	434	}
	435
	436	MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
	437	MODULE_DESCRIPTION("LM83 driver");
	438	MODULE_LICENSE("GPL");
	439
	440	module_init(sensors_lm83_init);
	441	module_exit(sensors_lm83_exit);