[linux-block.git] / drivers / hwmon / lm83.c

/*
 * lm83.c - Part of lm_sensors, Linux kernel modules for hardware
 *          monitoring
 * Copyright (C) 2003-2006  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 unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a,
					0x29, 0x2a, 0x2b,
					0x4c, 0x4d, 0x4e,
					I2C_CLIENT_END };

/*
 * Insmod parameters
 */

I2C_CLIENT_INSMOD_2(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_attach_adapter(struct i2c_adapter *adapter);
static int lm83_detect(struct i2c_adapter *adapter, int address, int kind);
static int lm83_detach_client(struct i2c_client *client);
static struct lm83_data *lm83_update_device(struct device *dev);

/*
 * Driver data (common to all clients)
 */
 
static struct i2c_driver lm83_driver = {
	.driver = {
		.name	= "lm83",
	},
	.id		= I2C_DRIVERID_LM83,
	.attach_adapter	= lm83_attach_adapter,
	.detach_client	= lm83_detach_client,
};

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

struct lm83_data {
	struct i2c_client client;
	struct class_device *class_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_input_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_input_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_input_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_input_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_input_fault.dev_attr.attr,
	&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_input_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
 */

static int lm83_attach_adapter(struct i2c_adapter *adapter)
{
	if (!(adapter->class & I2C_CLASS_HWMON))
		return 0;
	return i2c_probe(adapter, &addr_data, lm83_detect);
}

/*
 * The following function does more than just detection. If detection
 * succeeds, it also registers the new chip.
 */
static int lm83_detect(struct i2c_adapter *adapter, int address, int kind)
{
	struct i2c_client *new_client;
	struct lm83_data *data;
	int err = 0;
	const char *name = "";

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		goto exit;

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

	/* The common I2C client data is placed right after the
	 * LM83-specific data. */
	new_client = &data->client;
	i2c_set_clientdata(new_client, data);
	new_client->addr = address;
	new_client->adapter = adapter;
	new_client->driver = &lm83_driver;
	new_client->flags = 0;

	/* Now we do the detection and identification. A negative kind
	 * means that the driver was loaded with no force parameter
	 * (default), so we must both detect and identify the chip
	 * (actually there is only one possible kind of chip for now, LM83).
	 * A zero kind means that the driver was loaded with the force
	 * parameter, the detection step shall be skipped. A positive kind
	 * means that the driver was loaded with the force parameter and a
	 * given kind of chip is requested, so both the detection and the
	 * identification steps are skipped. */

	/* Default to an LM83 if forced */
	if (kind == 0)
		kind = lm83;

	if (kind < 0) { /* detection */
		if (((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS1)
		    & 0xA8) != 0x00) ||
		    ((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS2)
		    & 0x48) != 0x00) ||
		    ((i2c_smbus_read_byte_data(new_client, LM83_REG_R_CONFIG)
		    & 0x41) != 0x00)) {
			dev_dbg(&adapter->dev,
			    "LM83 detection failed at 0x%02x.\n", address);
			goto exit_free;
		}
	}

	if (kind <= 0) { /* identification */
		u8 man_id, chip_id;

		man_id = i2c_smbus_read_byte_data(new_client,
		    LM83_REG_R_MAN_ID);
		chip_id = i2c_smbus_read_byte_data(new_client,
		    LM83_REG_R_CHIP_ID);

		if (man_id == 0x01) { /* National Semiconductor */
			if (chip_id == 0x03) {
				kind = lm83;
			} else
			if (chip_id == 0x01) {
				kind = lm82;
			}
		}

		if (kind <= 0) { /* identification failed */
			dev_info(&adapter->dev,
			    "Unsupported chip (man_id=0x%02X, "
			    "chip_id=0x%02X).\n", man_id, chip_id);
			goto exit_free;
		}
	}

	if (kind == lm83) {
		name = "lm83";
	} else
	if (kind == lm82) {
		name = "lm82";
	}

	/* We can fill in the remaining client fields */
	strlcpy(new_client->name, name, I2C_NAME_SIZE);
	data->valid = 0;
	mutex_init(&data->update_lock);

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

	/*
	 * 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_detach;

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

	data->class_dev = hwmon_device_register(&new_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(&new_client->dev.kobj, &lm83_group);
	sysfs_remove_group(&new_client->dev.kobj, &lm83_group_opt);
exit_detach:
	i2c_detach_client(new_client);
exit_free:
	kfree(data);
exit:
	return err;
}

static int lm83_detach_client(struct i2c_client *client)
{
	struct lm83_data *data = i2c_get_clientdata(client);
	int err;

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

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

	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
2d45771e	4	* Copyright (C) 2003-2006 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
	51	static unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a,
	52	0x29, 0x2a, 0x2b,
	53	0x4c, 0x4d, 0x4e,
	54	I2C_CLIENT_END };
1da177e4 LT	55
	56	/*
	57	* Insmod parameters
	58	*/
	59
43cb7ebe	60	I2C_CLIENT_INSMOD_2(lm83, lm82);
1da177e4 LT	61
	62	/*
	63	* The LM83 registers
	64	* Manufacturer ID is 0x01 for National Semiconductor.
	65	*/
	66
	67	#define LM83_REG_R_MAN_ID 0xFE
	68	#define LM83_REG_R_CHIP_ID 0xFF
	69	#define LM83_REG_R_CONFIG 0x03
	70	#define LM83_REG_W_CONFIG 0x09
	71	#define LM83_REG_R_STATUS1 0x02
	72	#define LM83_REG_R_STATUS2 0x35
	73	#define LM83_REG_R_LOCAL_TEMP 0x00
	74	#define LM83_REG_R_LOCAL_HIGH 0x05
	75	#define LM83_REG_W_LOCAL_HIGH 0x0B
	76	#define LM83_REG_R_REMOTE1_TEMP 0x30
	77	#define LM83_REG_R_REMOTE1_HIGH 0x38
	78	#define LM83_REG_W_REMOTE1_HIGH 0x50
	79	#define LM83_REG_R_REMOTE2_TEMP 0x01
	80	#define LM83_REG_R_REMOTE2_HIGH 0x07
	81	#define LM83_REG_W_REMOTE2_HIGH 0x0D
	82	#define LM83_REG_R_REMOTE3_TEMP 0x31
	83	#define LM83_REG_R_REMOTE3_HIGH 0x3A
	84	#define LM83_REG_W_REMOTE3_HIGH 0x52
	85	#define LM83_REG_R_TCRIT 0x42
	86	#define LM83_REG_W_TCRIT 0x5A
	87
	88	/*
	89	* Conversions and various macros
44bbe87e	90	* The LM83 uses signed 8-bit values with LSB = 1 degree Celsius.
1da177e4 LT	91	*/
	92
	93	#define TEMP_FROM_REG(val) ((val) * 1000)
	94	#define TEMP_TO_REG(val) ((val) <= -128000 ? -128 : \
	95	(val) >= 127000 ? 127 : \
	96	(val) < 0 ? ((val) - 500) / 1000 : \
	97	((val) + 500) / 1000)
	98
	99	static const u8 LM83_REG_R_TEMP[] = {
	100	LM83_REG_R_LOCAL_TEMP,
	101	LM83_REG_R_REMOTE1_TEMP,
	102	LM83_REG_R_REMOTE2_TEMP,
1a86c051	103	LM83_REG_R_REMOTE3_TEMP,
1da177e4 LT	104	LM83_REG_R_LOCAL_HIGH,
	105	LM83_REG_R_REMOTE1_HIGH,
	106	LM83_REG_R_REMOTE2_HIGH,
1a86c051 JD	107	LM83_REG_R_REMOTE3_HIGH,
1a86c051 JD	108	LM83_REG_R_TCRIT,
1da177e4 LT	109	};
	110
	111	static const u8 LM83_REG_W_HIGH[] = {
	112	LM83_REG_W_LOCAL_HIGH,
	113	LM83_REG_W_REMOTE1_HIGH,
	114	LM83_REG_W_REMOTE2_HIGH,
1a86c051 JD	115	LM83_REG_W_REMOTE3_HIGH,
1a86c051 JD	116	LM83_REG_W_TCRIT,
1da177e4 LT	117	};
	118
	119	/*
	120	* Functions declaration
	121	*/
	122
	123	static int lm83_attach_adapter(struct i2c_adapter *adapter);
	124	static int lm83_detect(struct i2c_adapter *adapter, int address, int kind);
	125	static int lm83_detach_client(struct i2c_client *client);
	126	static struct lm83_data lm83_update_device(struct device dev);
	127
	128	/*
	129	* Driver data (common to all clients)
	130	*/
	131
	132	static struct i2c_driver lm83_driver = {
cdaf7934	133	.driver = {
cdaf7934 LR	134	.name = "lm83",
cdaf7934 LR	135	},
1da177e4	136	.id = I2C_DRIVERID_LM83,
1da177e4 LT	137	.attach_adapter = lm83_attach_adapter,
	138	.detach_client = lm83_detach_client,
	139	};
	140
	141	/*
	142	* Client data (each client gets its own)
	143	*/
	144
	145	struct lm83_data {
	146	struct i2c_client client;
943b0830	147	struct class_device *class_dev;
9a61bf63	148	struct mutex update_lock;
1da177e4 LT	149	char valid; /* zero until following fields are valid */
	150	unsigned long last_updated; /* in jiffies */
	151
	152	/* registers values */
1a86c051 JD	153	s8 temp[9]; /* 0..3: input 1-4,
	154	4..7: high limit 1-4,
	155	8 : critical limit */
1da177e4 LT	156	u16 alarms; /* bitvector, combined */
	157	};
	158
	159	/*
	160	* Sysfs stuff
	161	*/
	162
1a86c051 JD	163	static ssize_t show_temp(struct device dev, struct device_attribute devattr,
	164	char *buf)
	165	{
	166	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	167	struct lm83_data *data = lm83_update_device(dev);
	168	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
1da177e4	169	}
1a86c051 JD	170
	171	static ssize_t set_temp(struct device dev, struct device_attribute devattr,
	172	const char *buf, size_t count)
	173	{
	174	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	175	struct i2c_client *client = to_i2c_client(dev);
	176	struct lm83_data *data = i2c_get_clientdata(client);
	177	long val = simple_strtol(buf, NULL, 10);
	178	int nr = attr->index;
	179
9a61bf63	180	mutex_lock(&data->update_lock);
1a86c051 JD	181	data->temp[nr] = TEMP_TO_REG(val);
	182	i2c_smbus_write_byte_data(client, LM83_REG_W_HIGH[nr - 4],
	183	data->temp[nr]);
9a61bf63	184	mutex_unlock(&data->update_lock);
1a86c051	185	return count;
1da177e4	186	}
1da177e4	187
1a86c051 JD	188	static ssize_t show_alarms(struct device dev, struct device_attribute dummy,
1a86c051 JD	189	char *buf)
1da177e4 LT	190	{
	191	struct lm83_data *data = lm83_update_device(dev);
	192	return sprintf(buf, "%d\n", data->alarms);
	193	}
	194
2d45771e JD	195	static ssize_t show_alarm(struct device *dev, struct device_attribute
	196	devattr, char buf)
	197	{
	198	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	199	struct lm83_data *data = lm83_update_device(dev);
	200	int bitnr = attr->index;
	201
	202	return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
	203	}
	204
1a86c051 JD	205	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
	206	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
	207	static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
	208	static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
	209	static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR \| S_IRUGO, show_temp,
	210	set_temp, 4);
	211	static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR \| S_IRUGO, show_temp,
	212	set_temp, 5);
	213	static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR \| S_IRUGO, show_temp,
	214	set_temp, 6);
	215	static SENSOR_DEVICE_ATTR(temp4_max, S_IWUSR \| S_IRUGO, show_temp,
	216	set_temp, 7);
	217	static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL, 8);
	218	static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp, NULL, 8);
	219	static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR \| S_IRUGO, show_temp,
	220	set_temp, 8);
	221	static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO, show_temp, NULL, 8);
2d45771e JD	222
	223	/* Individual alarm files */
	224	static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0);
	225	static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
	226	static SENSOR_DEVICE_ATTR(temp3_input_fault, S_IRUGO, show_alarm, NULL, 2);
	227	static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 4);
	228	static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
	229	static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 8);
	230	static SENSOR_DEVICE_ATTR(temp4_crit_alarm, S_IRUGO, show_alarm, NULL, 9);
	231	static SENSOR_DEVICE_ATTR(temp4_input_fault, S_IRUGO, show_alarm, NULL, 10);
	232	static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 12);
	233	static SENSOR_DEVICE_ATTR(temp2_input_fault, S_IRUGO, show_alarm, NULL, 13);
	234	static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 15);
	235	/* Raw alarm file for compatibility */
1da177e4 LT	236	static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
1da177e4 LT	237
0e39e01c JD	238	static struct attribute *lm83_attributes[] = {
	239	&sensor_dev_attr_temp1_input.dev_attr.attr,
	240	&sensor_dev_attr_temp3_input.dev_attr.attr,
	241	&sensor_dev_attr_temp1_max.dev_attr.attr,
	242	&sensor_dev_attr_temp3_max.dev_attr.attr,
	243	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	244	&sensor_dev_attr_temp3_crit.dev_attr.attr,
	245
	246	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	247	&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
	248	&sensor_dev_attr_temp3_input_fault.dev_attr.attr,
	249	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
	250	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	251	&dev_attr_alarms.attr,
	252	NULL
	253	};
	254
	255	static const struct attribute_group lm83_group = {
	256	.attrs = lm83_attributes,
	257	};
	258
	259	static struct attribute *lm83_attributes_opt[] = {
	260	&sensor_dev_attr_temp2_input.dev_attr.attr,
	261	&sensor_dev_attr_temp4_input.dev_attr.attr,
	262	&sensor_dev_attr_temp2_max.dev_attr.attr,
	263	&sensor_dev_attr_temp4_max.dev_attr.attr,
	264	&sensor_dev_attr_temp2_crit.dev_attr.attr,
	265	&sensor_dev_attr_temp4_crit.dev_attr.attr,
	266
	267	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	268	&sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
	269	&sensor_dev_attr_temp4_input_fault.dev_attr.attr,
	270	&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
	271	&sensor_dev_attr_temp2_input_fault.dev_attr.attr,
	272	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	273	NULL
	274	};
	275
	276	static const struct attribute_group lm83_group_opt = {
	277	.attrs = lm83_attributes_opt,
	278	};
	279
1da177e4 LT	280	/*
	281	* Real code
	282	*/
	283
	284	static int lm83_attach_adapter(struct i2c_adapter *adapter)
	285	{
	286	if (!(adapter->class & I2C_CLASS_HWMON))
	287	return 0;
2ed2dc3c	288	return i2c_probe(adapter, &addr_data, lm83_detect);
1da177e4 LT	289	}
	290
	291	/*
	292	* The following function does more than just detection. If detection
	293	* succeeds, it also registers the new chip.
	294	*/
	295	static int lm83_detect(struct i2c_adapter *adapter, int address, int kind)
	296	{
	297	struct i2c_client *new_client;
	298	struct lm83_data *data;
	299	int err = 0;
	300	const char *name = "";
	301
	302	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	303	goto exit;
	304
ba9c2e8d	305	if (!(data = kzalloc(sizeof(struct lm83_data), GFP_KERNEL))) {
1da177e4 LT	306	err = -ENOMEM;
	307	goto exit;
	308	}
1da177e4 LT	309
	310	/* The common I2C client data is placed right after the
	311	* LM83-specific data. */
	312	new_client = &data->client;
	313	i2c_set_clientdata(new_client, data);
	314	new_client->addr = address;
	315	new_client->adapter = adapter;
	316	new_client->driver = &lm83_driver;
	317	new_client->flags = 0;
	318
	319	/* Now we do the detection and identification. A negative kind
	320	* means that the driver was loaded with no force parameter
	321	* (default), so we must both detect and identify the chip
	322	* (actually there is only one possible kind of chip for now, LM83).
	323	* A zero kind means that the driver was loaded with the force
	324	* parameter, the detection step shall be skipped. A positive kind
	325	* means that the driver was loaded with the force parameter and a
	326	* given kind of chip is requested, so both the detection and the
	327	* identification steps are skipped. */
	328
	329	/* Default to an LM83 if forced */
	330	if (kind == 0)
	331	kind = lm83;
	332
	333	if (kind < 0) { /* detection */
	334	if (((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS1)
	335	& 0xA8) != 0x00) \|\|
	336	((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS2)
	337	& 0x48) != 0x00) \|\|
	338	((i2c_smbus_read_byte_data(new_client, LM83_REG_R_CONFIG)
	339	& 0x41) != 0x00)) {
	340	dev_dbg(&adapter->dev,
	341	"LM83 detection failed at 0x%02x.\n", address);
	342	goto exit_free;
	343	}
	344	}
	345
	346	if (kind <= 0) { /* identification */
	347	u8 man_id, chip_id;
	348
	349	man_id = i2c_smbus_read_byte_data(new_client,
	350	LM83_REG_R_MAN_ID);
	351	chip_id = i2c_smbus_read_byte_data(new_client,
	352	LM83_REG_R_CHIP_ID);
	353
	354	if (man_id == 0x01) { /* National Semiconductor */
	355	if (chip_id == 0x03) {
	356	kind = lm83;
43cb7ebe JC	357	} else
	358	if (chip_id == 0x01) {
	359	kind = lm82;
1da177e4 LT	360	}
	361	}
	362
	363	if (kind <= 0) { /* identification failed */
	364	dev_info(&adapter->dev,
	365	"Unsupported chip (man_id=0x%02X, "
	366	"chip_id=0x%02X).\n", man_id, chip_id);
	367	goto exit_free;
	368	}
	369	}
	370
	371	if (kind == lm83) {
	372	name = "lm83";
43cb7ebe JC	373	} else
	374	if (kind == lm82) {
	375	name = "lm82";
1da177e4 LT	376	}
	377
	378	/* We can fill in the remaining client fields */
	379	strlcpy(new_client->name, name, I2C_NAME_SIZE);
	380	data->valid = 0;
9a61bf63	381	mutex_init(&data->update_lock);
1da177e4 LT	382
	383	/* Tell the I2C layer a new client has arrived */
	384	if ((err = i2c_attach_client(new_client)))
	385	goto exit_free;
	386
	387	/*
0e39e01c	388	* Register sysfs hooks
43cb7ebe JC	389	* The LM82 can only monitor one external diode which is
	390	* at the same register as the LM83 temp3 entry - so we
	391	* declare 1 and 3 common, and then 2 and 4 only for the LM83.
	392	*/
	393
0e39e01c JD	394	if ((err = sysfs_create_group(&new_client->dev.kobj, &lm83_group)))
0e39e01c JD	395	goto exit_detach;
1da177e4	396
43cb7ebe	397	if (kind == lm83) {
0e39e01c JD	398	if ((err = sysfs_create_group(&new_client->dev.kobj,
	399	&lm83_group_opt)))
	400	goto exit_remove_files;
	401	}
	402
	403	data->class_dev = hwmon_device_register(&new_client->dev);
	404	if (IS_ERR(data->class_dev)) {
	405	err = PTR_ERR(data->class_dev);
	406	goto exit_remove_files;
43cb7ebe JC	407	}
43cb7ebe JC	408
1da177e4 LT	409	return 0;
1da177e4 LT	410
0e39e01c JD	411	exit_remove_files:
	412	sysfs_remove_group(&new_client->dev.kobj, &lm83_group);
	413	sysfs_remove_group(&new_client->dev.kobj, &lm83_group_opt);
943b0830 MH	414	exit_detach:
943b0830 MH	415	i2c_detach_client(new_client);
1da177e4 LT	416	exit_free:
	417	kfree(data);
	418	exit:
	419	return err;
	420	}
	421
	422	static int lm83_detach_client(struct i2c_client *client)
	423	{
943b0830	424	struct lm83_data *data = i2c_get_clientdata(client);
1da177e4 LT	425	int err;
1da177e4 LT	426
943b0830	427	hwmon_device_unregister(data->class_dev);
0e39e01c JD	428	sysfs_remove_group(&client->dev.kobj, &lm83_group);
0e39e01c JD	429	sysfs_remove_group(&client->dev.kobj, &lm83_group_opt);
943b0830	430
7bef5594	431	if ((err = i2c_detach_client(client)))
1da177e4	432	return err;
1da177e4	433
943b0830	434	kfree(data);
1da177e4 LT	435	return 0;
	436	}
	437
	438	static struct lm83_data lm83_update_device(struct device dev)
	439	{
	440	struct i2c_client *client = to_i2c_client(dev);
	441	struct lm83_data *data = i2c_get_clientdata(client);
	442
9a61bf63	443	mutex_lock(&data->update_lock);
1da177e4 LT	444
	445	if (time_after(jiffies, data->last_updated + HZ * 2) \|\| !data->valid) {
	446	int nr;
	447
	448	dev_dbg(&client->dev, "Updating lm83 data.\n");
1a86c051 JD	449	for (nr = 0; nr < 9; nr++) {
1a86c051 JD	450	data->temp[nr] =
1da177e4 LT	451	i2c_smbus_read_byte_data(client,
1da177e4 LT	452	LM83_REG_R_TEMP[nr]);
1da177e4	453	}
1da177e4 LT	454	data->alarms =
	455	i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS1)
	456	+ (i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS2)
	457	<< 8);
	458
	459	data->last_updated = jiffies;
	460	data->valid = 1;
	461	}
	462
9a61bf63	463	mutex_unlock(&data->update_lock);
1da177e4 LT	464
	465	return data;
	466	}
	467
	468	static int __init sensors_lm83_init(void)
	469	{
	470	return i2c_add_driver(&lm83_driver);
	471	}
	472
	473	static void __exit sensors_lm83_exit(void)
	474	{
	475	i2c_del_driver(&lm83_driver);
	476	}
	477
	478	MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
	479	MODULE_DESCRIPTION("LM83 driver");
	480	MODULE_LICENSE("GPL");
	481
	482	module_init(sensors_lm83_init);
	483	module_exit(sensors_lm83_exit);