[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / hwmon / lm83.c

/*
 * lm83.c - Part of lm_sensors, Linux kernel modules for hardware
 *          monitoring
 * Copyright (C) 2003-2005  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).
 *
 * 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>

/*
 * 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_1(lm83);

/*
 * 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 semaphore 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;

	down(&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]);
	up(&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 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);
static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);

/*
 * 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;
			}
		}

		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";
	}

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

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

	/*
	 * Initialize the LM83 chip
	 * (Nothing to do for this one.)
	 */

	/* Register sysfs hooks */
	data->class_dev = hwmon_device_register(&new_client->dev);
	if (IS_ERR(data->class_dev)) {
		err = PTR_ERR(data->class_dev);
		goto exit_detach;
	}

	device_create_file(&new_client->dev,
			   &sensor_dev_attr_temp1_input.dev_attr);
	device_create_file(&new_client->dev,
			   &sensor_dev_attr_temp2_input.dev_attr);
	device_create_file(&new_client->dev,
			   &sensor_dev_attr_temp3_input.dev_attr);
	device_create_file(&new_client->dev,
			   &sensor_dev_attr_temp4_input.dev_attr);
	device_create_file(&new_client->dev,
			   &sensor_dev_attr_temp1_max.dev_attr);
	device_create_file(&new_client->dev,
			   &sensor_dev_attr_temp2_max.dev_attr);
	device_create_file(&new_client->dev,
			   &sensor_dev_attr_temp3_max.dev_attr);
	device_create_file(&new_client->dev,
			   &sensor_dev_attr_temp4_max.dev_attr);
	device_create_file(&new_client->dev,
			   &sensor_dev_attr_temp1_crit.dev_attr);
	device_create_file(&new_client->dev,
			   &sensor_dev_attr_temp2_crit.dev_attr);
	device_create_file(&new_client->dev,
			   &sensor_dev_attr_temp3_crit.dev_attr);
	device_create_file(&new_client->dev,
			   &sensor_dev_attr_temp4_crit.dev_attr);
	device_create_file(&new_client->dev, &dev_attr_alarms);

	return 0;

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);

	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);

	down(&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;
	}

	up(&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
1a86c051	4	* Copyright (C) 2003-2005 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	*
	15	* This program is free software; you can redistribute it and/or modify
	16	* it under the terms of the GNU General Public License as published by
	17	* the Free Software Foundation; either version 2 of the License, or
	18	* (at your option) any later version.
	19	*
	20	* This program is distributed in the hope that it will be useful,
	21	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	22	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	23	* GNU General Public License for more details.
	24	*
	25	* You should have received a copy of the GNU General Public License
	26	* along with this program; if not, write to the Free Software
	27	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	28	*/
	29
1da177e4 LT	30	#include <linux/module.h>
	31	#include <linux/init.h>
	32	#include <linux/slab.h>
	33	#include <linux/jiffies.h>
	34	#include <linux/i2c.h>
10c08f81	35	#include <linux/hwmon-sysfs.h>
943b0830 MH	36	#include <linux/hwmon.h>
943b0830 MH	37	#include <linux/err.h>
1da177e4 LT	38
	39	/*
	40	* Addresses to scan
	41	* Address is selected using 2 three-level pins, resulting in 9 possible
	42	* addresses.
	43	*/
	44
	45	static unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a,
	46	0x29, 0x2a, 0x2b,
	47	0x4c, 0x4d, 0x4e,
	48	I2C_CLIENT_END };
1da177e4 LT	49
	50	/*
	51	* Insmod parameters
	52	*/
	53
f4b50261	54	I2C_CLIENT_INSMOD_1(lm83);
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
	117	static int lm83_attach_adapter(struct i2c_adapter *adapter);
	118	static int lm83_detect(struct i2c_adapter *adapter, int address, int kind);
	119	static int lm83_detach_client(struct i2c_client *client);
	120	static struct lm83_data lm83_update_device(struct device dev);
	121
	122	/*
	123	* Driver data (common to all clients)
	124	*/
	125
	126	static struct i2c_driver lm83_driver = {
cdaf7934	127	.driver = {
cdaf7934 LR	128	.name = "lm83",
cdaf7934 LR	129	},
1da177e4	130	.id = I2C_DRIVERID_LM83,
1da177e4 LT	131	.attach_adapter = lm83_attach_adapter,
	132	.detach_client = lm83_detach_client,
	133	};
	134
	135	/*
	136	* Client data (each client gets its own)
	137	*/
	138
	139	struct lm83_data {
	140	struct i2c_client client;
943b0830	141	struct class_device *class_dev;
1da177e4 LT	142	struct semaphore update_lock;
	143	char valid; /* zero until following fields are valid */
	144	unsigned long last_updated; /* in jiffies */
	145
	146	/* registers values */
1a86c051 JD	147	s8 temp[9]; /* 0..3: input 1-4,
	148	4..7: high limit 1-4,
	149	8 : critical limit */
1da177e4 LT	150	u16 alarms; /* bitvector, combined */
	151	};
	152
	153	/*
	154	* Sysfs stuff
	155	*/
	156
1a86c051 JD	157	static ssize_t show_temp(struct device dev, struct device_attribute devattr,
	158	char *buf)
	159	{
	160	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	161	struct lm83_data *data = lm83_update_device(dev);
	162	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
1da177e4	163	}
1a86c051 JD	164
	165	static ssize_t set_temp(struct device dev, struct device_attribute devattr,
	166	const char *buf, size_t count)
	167	{
	168	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	169	struct i2c_client *client = to_i2c_client(dev);
	170	struct lm83_data *data = i2c_get_clientdata(client);
	171	long val = simple_strtol(buf, NULL, 10);
	172	int nr = attr->index;
	173
	174	down(&data->update_lock);
	175	data->temp[nr] = TEMP_TO_REG(val);
	176	i2c_smbus_write_byte_data(client, LM83_REG_W_HIGH[nr - 4],
	177	data->temp[nr]);
	178	up(&data->update_lock);
	179	return count;
1da177e4	180	}
1da177e4	181
1a86c051 JD	182	static ssize_t show_alarms(struct device dev, struct device_attribute dummy,
1a86c051 JD	183	char *buf)
1da177e4 LT	184	{
	185	struct lm83_data *data = lm83_update_device(dev);
	186	return sprintf(buf, "%d\n", data->alarms);
	187	}
	188
1a86c051 JD	189	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
	190	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
	191	static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
	192	static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
	193	static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR \| S_IRUGO, show_temp,
	194	set_temp, 4);
	195	static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR \| S_IRUGO, show_temp,
	196	set_temp, 5);
	197	static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR \| S_IRUGO, show_temp,
	198	set_temp, 6);
	199	static SENSOR_DEVICE_ATTR(temp4_max, S_IWUSR \| S_IRUGO, show_temp,
	200	set_temp, 7);
	201	static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL, 8);
	202	static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp, NULL, 8);
	203	static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR \| S_IRUGO, show_temp,
	204	set_temp, 8);
	205	static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO, show_temp, NULL, 8);
1da177e4 LT	206	static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
	207
	208	/*
	209	* Real code
	210	*/
	211
	212	static int lm83_attach_adapter(struct i2c_adapter *adapter)
	213	{
	214	if (!(adapter->class & I2C_CLASS_HWMON))
	215	return 0;
2ed2dc3c	216	return i2c_probe(adapter, &addr_data, lm83_detect);
1da177e4 LT	217	}
	218
	219	/*
	220	* The following function does more than just detection. If detection
	221	* succeeds, it also registers the new chip.
	222	*/
	223	static int lm83_detect(struct i2c_adapter *adapter, int address, int kind)
	224	{
	225	struct i2c_client *new_client;
	226	struct lm83_data *data;
	227	int err = 0;
	228	const char *name = "";
	229
	230	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	231	goto exit;
	232
ba9c2e8d	233	if (!(data = kzalloc(sizeof(struct lm83_data), GFP_KERNEL))) {
1da177e4 LT	234	err = -ENOMEM;
	235	goto exit;
	236	}
1da177e4 LT	237
	238	/* The common I2C client data is placed right after the
	239	* LM83-specific data. */
	240	new_client = &data->client;
	241	i2c_set_clientdata(new_client, data);
	242	new_client->addr = address;
	243	new_client->adapter = adapter;
	244	new_client->driver = &lm83_driver;
	245	new_client->flags = 0;
	246
	247	/* Now we do the detection and identification. A negative kind
	248	* means that the driver was loaded with no force parameter
	249	* (default), so we must both detect and identify the chip
	250	* (actually there is only one possible kind of chip for now, LM83).
	251	* A zero kind means that the driver was loaded with the force
	252	* parameter, the detection step shall be skipped. A positive kind
	253	* means that the driver was loaded with the force parameter and a
	254	* given kind of chip is requested, so both the detection and the
	255	* identification steps are skipped. */
	256
	257	/* Default to an LM83 if forced */
	258	if (kind == 0)
	259	kind = lm83;
	260
	261	if (kind < 0) { /* detection */
	262	if (((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS1)
	263	& 0xA8) != 0x00) \|\|
	264	((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS2)
	265	& 0x48) != 0x00) \|\|
	266	((i2c_smbus_read_byte_data(new_client, LM83_REG_R_CONFIG)
	267	& 0x41) != 0x00)) {
	268	dev_dbg(&adapter->dev,
	269	"LM83 detection failed at 0x%02x.\n", address);
	270	goto exit_free;
	271	}
	272	}
	273
	274	if (kind <= 0) { /* identification */
	275	u8 man_id, chip_id;
	276
	277	man_id = i2c_smbus_read_byte_data(new_client,
	278	LM83_REG_R_MAN_ID);
	279	chip_id = i2c_smbus_read_byte_data(new_client,
	280	LM83_REG_R_CHIP_ID);
	281
	282	if (man_id == 0x01) { /* National Semiconductor */
	283	if (chip_id == 0x03) {
	284	kind = lm83;
	285	}
	286	}
	287
	288	if (kind <= 0) { /* identification failed */
	289	dev_info(&adapter->dev,
	290	"Unsupported chip (man_id=0x%02X, "
	291	"chip_id=0x%02X).\n", man_id, chip_id);
	292	goto exit_free;
	293	}
	294	}
	295
	296	if (kind == lm83) {
	297	name = "lm83";
	298	}
	299
	300	/* We can fill in the remaining client fields */
301	strlcpy(new_client->name, name, I2C_NAME_SIZE);
302	data->valid = 0;
303	init_MUTEX(&data->update_lock);
304
305	/* Tell the I2C layer a new client has arrived */
306	if ((err = i2c_attach_client(new_client)))
307	goto exit_free;
308
309	/*
310	* Initialize the LM83 chip
311	* (Nothing to do for this one.)
312	*/
313
314	/* Register sysfs hooks */
943b0830 MH	315	data->class_dev = hwmon_device_register(&new_client->dev);
	316	if (IS_ERR(data->class_dev)) {
	317	err = PTR_ERR(data->class_dev);
	318	goto exit_detach;
	319	}
	320
1a86c051 JD	321	device_create_file(&new_client->dev,
	322	&sensor_dev_attr_temp1_input.dev_attr);
	323	device_create_file(&new_client->dev,
	324	&sensor_dev_attr_temp2_input.dev_attr);
	325	device_create_file(&new_client->dev,
	326	&sensor_dev_attr_temp3_input.dev_attr);
	327	device_create_file(&new_client->dev,
	328	&sensor_dev_attr_temp4_input.dev_attr);
	329	device_create_file(&new_client->dev,
	330	&sensor_dev_attr_temp1_max.dev_attr);
	331	device_create_file(&new_client->dev,
	332	&sensor_dev_attr_temp2_max.dev_attr);
	333	device_create_file(&new_client->dev,
	334	&sensor_dev_attr_temp3_max.dev_attr);
	335	device_create_file(&new_client->dev,
	336	&sensor_dev_attr_temp4_max.dev_attr);
	337	device_create_file(&new_client->dev,
	338	&sensor_dev_attr_temp1_crit.dev_attr);
	339	device_create_file(&new_client->dev,
	340	&sensor_dev_attr_temp2_crit.dev_attr);
	341	device_create_file(&new_client->dev,
	342	&sensor_dev_attr_temp3_crit.dev_attr);
	343	device_create_file(&new_client->dev,
	344	&sensor_dev_attr_temp4_crit.dev_attr);
1da177e4 LT	345	device_create_file(&new_client->dev, &dev_attr_alarms);
	346
	347	return 0;
	348
943b0830 MH	349	exit_detach:
943b0830 MH	350	i2c_detach_client(new_client);
1da177e4 LT	351	exit_free:
	352	kfree(data);
	353	exit:
	354	return err;
	355	}
	356
	357	static int lm83_detach_client(struct i2c_client *client)
	358	{
943b0830	359	struct lm83_data *data = i2c_get_clientdata(client);
1da177e4 LT	360	int err;
1da177e4 LT	361
943b0830 MH	362	hwmon_device_unregister(data->class_dev);
943b0830 MH	363
7bef5594	364	if ((err = i2c_detach_client(client)))
1da177e4	365	return err;
1da177e4	366
943b0830	367	kfree(data);
1da177e4 LT	368	return 0;
	369	}
	370
	371	static struct lm83_data lm83_update_device(struct device dev)
	372	{
	373	struct i2c_client *client = to_i2c_client(dev);
	374	struct lm83_data *data = i2c_get_clientdata(client);
	375
	376	down(&data->update_lock);
	377
	378	if (time_after(jiffies, data->last_updated + HZ * 2) \|\| !data->valid) {
	379	int nr;
	380
	381	dev_dbg(&client->dev, "Updating lm83 data.\n");
1a86c051 JD	382	for (nr = 0; nr < 9; nr++) {
1a86c051 JD	383	data->temp[nr] =
1da177e4 LT	384	i2c_smbus_read_byte_data(client,
1da177e4 LT	385	LM83_REG_R_TEMP[nr]);
1da177e4	386	}
1da177e4 LT	387	data->alarms =
	388	i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS1)
	389	+ (i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS2)
	390	<< 8);
	391
	392	data->last_updated = jiffies;
	393	data->valid = 1;
	394	}
	395
	396	up(&data->update_lock);
	397
	398	return data;
	399	}
	400
	401	static int __init sensors_lm83_init(void)
	402	{
	403	return i2c_add_driver(&lm83_driver);
	404	}
	405
	406	static void __exit sensors_lm83_exit(void)
	407	{
	408	i2c_del_driver(&lm83_driver);
	409	}
	410
	411	MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
	412	MODULE_DESCRIPTION("LM83 driver");
	413	MODULE_LICENSE("GPL");
	414
	415	module_init(sensors_lm83_init);
	416	module_exit(sensors_lm83_exit);