[deliverable/linux.git] / drivers / hwmon / lm83.c

/*
 * lm83.c - Part of lm_sensors, Linux kernel modules for hardware
 *          monitoring
 * Copyright (C) 2003-2009  Jean Delvare <jdelvare@suse.de>
 *
 * 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.
 */

#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;
	int nr = attr->index;
	int err;

	err = kstrtol(buf, 10, &val);
	if (err < 0)
		return err;

	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 = devm_kzalloc(&new_client->dev, sizeof(struct lm83_data),
			    GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	i2c_set_clientdata(new_client, data);
	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.
	 */

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

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

	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;
}

module_i2c_driver(lm83_driver);

MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
MODULE_DESCRIPTION("LM83 driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* lm83.c - Part of lm_sensors, Linux kernel modules for hardware
	3	* monitoring
7c81c60f	4	* Copyright (C) 2003-2009 Jean Delvare <jdelvare@suse.de>
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.
1da177e4 LT	28	*/
1da177e4 LT	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>
9a61bf63	38	#include <linux/mutex.h>
0e39e01c	39	#include <linux/sysfs.h>
1da177e4 LT	40
	41	/*
	42	* Addresses to scan
	43	* Address is selected using 2 three-level pins, resulting in 9 possible
	44	* addresses.
	45	*/
	46
25e9c86d MH	47	static const unsigned short normal_i2c[] = {
25e9c86d MH	48	0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
1da177e4	49
e5e9f44c	50	enum chips { lm83, lm82 };
1da177e4 LT	51
	52	/*
	53	* The LM83 registers
	54	* Manufacturer ID is 0x01 for National Semiconductor.
	55	*/
	56
	57	#define LM83_REG_R_MAN_ID 0xFE
	58	#define LM83_REG_R_CHIP_ID 0xFF
	59	#define LM83_REG_R_CONFIG 0x03
	60	#define LM83_REG_W_CONFIG 0x09
	61	#define LM83_REG_R_STATUS1 0x02
	62	#define LM83_REG_R_STATUS2 0x35
	63	#define LM83_REG_R_LOCAL_TEMP 0x00
	64	#define LM83_REG_R_LOCAL_HIGH 0x05
	65	#define LM83_REG_W_LOCAL_HIGH 0x0B
	66	#define LM83_REG_R_REMOTE1_TEMP 0x30
	67	#define LM83_REG_R_REMOTE1_HIGH 0x38
	68	#define LM83_REG_W_REMOTE1_HIGH 0x50
	69	#define LM83_REG_R_REMOTE2_TEMP 0x01
	70	#define LM83_REG_R_REMOTE2_HIGH 0x07
	71	#define LM83_REG_W_REMOTE2_HIGH 0x0D
	72	#define LM83_REG_R_REMOTE3_TEMP 0x31
	73	#define LM83_REG_R_REMOTE3_HIGH 0x3A
	74	#define LM83_REG_W_REMOTE3_HIGH 0x52
	75	#define LM83_REG_R_TCRIT 0x42
	76	#define LM83_REG_W_TCRIT 0x5A
	77
	78	/*
	79	* Conversions and various macros
44bbe87e	80	* The LM83 uses signed 8-bit values with LSB = 1 degree Celsius.
1da177e4 LT	81	*/
	82
	83	#define TEMP_FROM_REG(val) ((val) * 1000)
	84	#define TEMP_TO_REG(val) ((val) <= -128000 ? -128 : \
	85	(val) >= 127000 ? 127 : \
	86	(val) < 0 ? ((val) - 500) / 1000 : \
	87	((val) + 500) / 1000)
	88
	89	static const u8 LM83_REG_R_TEMP[] = {
	90	LM83_REG_R_LOCAL_TEMP,
	91	LM83_REG_R_REMOTE1_TEMP,
	92	LM83_REG_R_REMOTE2_TEMP,
1a86c051	93	LM83_REG_R_REMOTE3_TEMP,
1da177e4 LT	94	LM83_REG_R_LOCAL_HIGH,
	95	LM83_REG_R_REMOTE1_HIGH,
	96	LM83_REG_R_REMOTE2_HIGH,
1a86c051 JD	97	LM83_REG_R_REMOTE3_HIGH,
1a86c051 JD	98	LM83_REG_R_TCRIT,
1da177e4 LT	99	};
	100
	101	static const u8 LM83_REG_W_HIGH[] = {
	102	LM83_REG_W_LOCAL_HIGH,
	103	LM83_REG_W_REMOTE1_HIGH,
	104	LM83_REG_W_REMOTE2_HIGH,
1a86c051 JD	105	LM83_REG_W_REMOTE3_HIGH,
1a86c051 JD	106	LM83_REG_W_TCRIT,
1da177e4 LT	107	};
	108
	109	/*
	110	* Functions declaration
	111	*/
	112
310ec792	113	static int lm83_detect(struct i2c_client *new_client,
b6aacdce JD	114	struct i2c_board_info *info);
	115	static int lm83_probe(struct i2c_client *client,
	116	const struct i2c_device_id *id);
	117	static int lm83_remove(struct i2c_client *client);
1da177e4 LT	118	static struct lm83_data lm83_update_device(struct device dev);
	119
	120	/*
	121	* Driver data (common to all clients)
	122	*/
b3789a0d	123
b6aacdce JD	124	static const struct i2c_device_id lm83_id[] = {
	125	{ "lm83", lm83 },
	126	{ "lm82", lm82 },
	127	{ }
	128	};
	129	MODULE_DEVICE_TABLE(i2c, lm83_id);
	130
1da177e4	131	static struct i2c_driver lm83_driver = {
b6aacdce	132	.class = I2C_CLASS_HWMON,
cdaf7934	133	.driver = {
cdaf7934 LR	134	.name = "lm83",
cdaf7934 LR	135	},
b6aacdce JD	136	.probe = lm83_probe,
	137	.remove = lm83_remove,
	138	.id_table = lm83_id,
	139	.detect = lm83_detect,
c3813d6a	140	.address_list = normal_i2c,
1da177e4 LT	141	};
	142
	143	/*
	144	* Client data (each client gets its own)
	145	*/
	146
	147	struct lm83_data {
1beeffe4	148	struct device *hwmon_dev;
9a61bf63	149	struct mutex update_lock;
1da177e4 LT	150	char valid; /* zero until following fields are valid */
	151	unsigned long last_updated; /* in jiffies */
	152
	153	/* registers values */
1a86c051 JD	154	s8 temp[9]; /* 0..3: input 1-4,
	155	4..7: high limit 1-4,
	156	8 : critical limit */
1da177e4 LT	157	u16 alarms; /* bitvector, combined */
	158	};
	159
	160	/*
	161	* Sysfs stuff
	162	*/
	163
1a86c051 JD	164	static ssize_t show_temp(struct device dev, struct device_attribute devattr,
	165	char *buf)
	166	{
	167	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	168	struct lm83_data *data = lm83_update_device(dev);
	169	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
1da177e4	170	}
1a86c051 JD	171
	172	static ssize_t set_temp(struct device dev, struct device_attribute devattr,
	173	const char *buf, size_t count)
	174	{
	175	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	176	struct i2c_client *client = to_i2c_client(dev);
	177	struct lm83_data *data = i2c_get_clientdata(client);
b3789a0d	178	long val;
1a86c051	179	int nr = attr->index;
b3789a0d FM	180	int err;
	181
	182	err = kstrtol(buf, 10, &val);
	183	if (err < 0)
	184	return err;
1a86c051	185
9a61bf63	186	mutex_lock(&data->update_lock);
1a86c051 JD	187	data->temp[nr] = TEMP_TO_REG(val);
	188	i2c_smbus_write_byte_data(client, LM83_REG_W_HIGH[nr - 4],
	189	data->temp[nr]);
9a61bf63	190	mutex_unlock(&data->update_lock);
1a86c051	191	return count;
1da177e4	192	}
1da177e4	193
1a86c051 JD	194	static ssize_t show_alarms(struct device dev, struct device_attribute dummy,
1a86c051 JD	195	char *buf)
1da177e4 LT	196	{
	197	struct lm83_data *data = lm83_update_device(dev);
	198	return sprintf(buf, "%d\n", data->alarms);
	199	}
	200
2d45771e JD	201	static ssize_t show_alarm(struct device *dev, struct device_attribute
	202	devattr, char buf)
	203	{
	204	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	205	struct lm83_data *data = lm83_update_device(dev);
	206	int bitnr = attr->index;
	207
	208	return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
	209	}
	210
1a86c051 JD	211	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
	212	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
	213	static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
	214	static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
	215	static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR \| S_IRUGO, show_temp,
	216	set_temp, 4);
	217	static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR \| S_IRUGO, show_temp,
	218	set_temp, 5);
	219	static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR \| S_IRUGO, show_temp,
	220	set_temp, 6);
	221	static SENSOR_DEVICE_ATTR(temp4_max, S_IWUSR \| S_IRUGO, show_temp,
	222	set_temp, 7);
	223	static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL, 8);
	224	static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp, NULL, 8);
	225	static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR \| S_IRUGO, show_temp,
	226	set_temp, 8);
	227	static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO, show_temp, NULL, 8);
2d45771e JD	228
	229	/* Individual alarm files */
	230	static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0);
	231	static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
7817a39e	232	static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2);
2d45771e JD	233	static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 4);
	234	static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
	235	static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 8);
	236	static SENSOR_DEVICE_ATTR(temp4_crit_alarm, S_IRUGO, show_alarm, NULL, 9);
7817a39e	237	static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_alarm, NULL, 10);
2d45771e	238	static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 12);
7817a39e	239	static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 13);
2d45771e JD	240	static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 15);
2d45771e JD	241	/* Raw alarm file for compatibility */
1da177e4 LT	242	static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
1da177e4 LT	243
0e39e01c JD	244	static struct attribute *lm83_attributes[] = {
	245	&sensor_dev_attr_temp1_input.dev_attr.attr,
	246	&sensor_dev_attr_temp3_input.dev_attr.attr,
	247	&sensor_dev_attr_temp1_max.dev_attr.attr,
	248	&sensor_dev_attr_temp3_max.dev_attr.attr,
	249	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	250	&sensor_dev_attr_temp3_crit.dev_attr.attr,
	251
	252	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	253	&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
7817a39e	254	&sensor_dev_attr_temp3_fault.dev_attr.attr,
0e39e01c JD	255	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
	256	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	257	&dev_attr_alarms.attr,
	258	NULL
	259	};
	260
	261	static const struct attribute_group lm83_group = {
	262	.attrs = lm83_attributes,
	263	};
	264
	265	static struct attribute *lm83_attributes_opt[] = {
	266	&sensor_dev_attr_temp2_input.dev_attr.attr,
	267	&sensor_dev_attr_temp4_input.dev_attr.attr,
	268	&sensor_dev_attr_temp2_max.dev_attr.attr,
	269	&sensor_dev_attr_temp4_max.dev_attr.attr,
	270	&sensor_dev_attr_temp2_crit.dev_attr.attr,
	271	&sensor_dev_attr_temp4_crit.dev_attr.attr,
	272
	273	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	274	&sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
7817a39e	275	&sensor_dev_attr_temp4_fault.dev_attr.attr,
0e39e01c	276	&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
7817a39e	277	&sensor_dev_attr_temp2_fault.dev_attr.attr,
0e39e01c JD	278	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	279	NULL
	280	};
	281
	282	static const struct attribute_group lm83_group_opt = {
	283	.attrs = lm83_attributes_opt,
	284	};
	285
1da177e4 LT	286	/*
	287	* Real code
	288	*/
	289
b6aacdce	290	/* Return 0 if detection is successful, -ENODEV otherwise */
310ec792	291	static int lm83_detect(struct i2c_client *new_client,
b6aacdce	292	struct i2c_board_info *info)
1da177e4	293	{
b6aacdce	294	struct i2c_adapter *adapter = new_client->adapter;
b57dc394 JD	295	const char *name;
b57dc394 JD	296	u8 man_id, chip_id;
1da177e4 LT	297
1da177e4 LT	298	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
b6aacdce	299	return -ENODEV;
1da177e4	300
b57dc394 JD	301	/* Detection */
	302	if ((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS1) & 0xA8) \|\|
	303	(i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS2) & 0x48) \|\|
	304	(i2c_smbus_read_byte_data(new_client, LM83_REG_R_CONFIG) & 0x41)) {
	305	dev_dbg(&adapter->dev, "LM83 detection failed at 0x%02x\n",
	306	new_client->addr);
	307	return -ENODEV;
1da177e4 LT	308	}
1da177e4 LT	309
b57dc394 JD	310	/* Identification */
	311	man_id = i2c_smbus_read_byte_data(new_client, LM83_REG_R_MAN_ID);
	312	if (man_id != 0x01) /* National Semiconductor */
	313	return -ENODEV;
1da177e4	314
b57dc394 JD	315	chip_id = i2c_smbus_read_byte_data(new_client, LM83_REG_R_CHIP_ID);
	316	switch (chip_id) {
	317	case 0x03:
1da177e4	318	name = "lm83";
b57dc394 JD	319	break;
b57dc394 JD	320	case 0x01:
43cb7ebe	321	name = "lm82";
b57dc394 JD	322	break;
	323	default:
	324	/* identification failed */
	325	dev_info(&adapter->dev,
	326	"Unsupported chip (man_id=0x%02X, chip_id=0x%02X)\n",
	327	man_id, chip_id);
	328	return -ENODEV;
1da177e4 LT	329	}
1da177e4 LT	330
b6aacdce JD	331	strlcpy(info->type, name, I2C_NAME_SIZE);
	332
	333	return 0;
	334	}
	335
	336	static int lm83_probe(struct i2c_client *new_client,
	337	const struct i2c_device_id *id)
	338	{
	339	struct lm83_data *data;
	340	int err;
	341
c087f73a GR	342	data = devm_kzalloc(&new_client->dev, sizeof(struct lm83_data),
	343	GFP_KERNEL);
	344	if (!data)
	345	return -ENOMEM;
b6aacdce JD	346
b6aacdce JD	347	i2c_set_clientdata(new_client, data);
9a61bf63	348	mutex_init(&data->update_lock);
1da177e4	349
1da177e4	350	/*
0e39e01c	351	* Register sysfs hooks
43cb7ebe JC	352	* The LM82 can only monitor one external diode which is
	353	* at the same register as the LM83 temp3 entry - so we
	354	* declare 1 and 3 common, and then 2 and 4 only for the LM83.
	355	*/
	356
b3789a0d FM	357	err = sysfs_create_group(&new_client->dev.kobj, &lm83_group);
b3789a0d FM	358	if (err)
c087f73a	359	return err;
1da177e4	360
b6aacdce	361	if (id->driver_data == lm83) {
b3789a0d FM	362	err = sysfs_create_group(&new_client->dev.kobj,
	363	&lm83_group_opt);
	364	if (err)
0e39e01c JD	365	goto exit_remove_files;
	366	}
	367
1beeffe4 TJ	368	data->hwmon_dev = hwmon_device_register(&new_client->dev);
	369	if (IS_ERR(data->hwmon_dev)) {
	370	err = PTR_ERR(data->hwmon_dev);
0e39e01c	371	goto exit_remove_files;
43cb7ebe JC	372	}
43cb7ebe JC	373
1da177e4 LT	374	return 0;
1da177e4 LT	375
0e39e01c JD	376	exit_remove_files:
	377	sysfs_remove_group(&new_client->dev.kobj, &lm83_group);
	378	sysfs_remove_group(&new_client->dev.kobj, &lm83_group_opt);
1da177e4 LT	379	return err;
	380	}
	381
b6aacdce	382	static int lm83_remove(struct i2c_client *client)
1da177e4	383	{
943b0830	384	struct lm83_data *data = i2c_get_clientdata(client);
1da177e4	385
1beeffe4	386	hwmon_device_unregister(data->hwmon_dev);
0e39e01c JD	387	sysfs_remove_group(&client->dev.kobj, &lm83_group);
0e39e01c JD	388	sysfs_remove_group(&client->dev.kobj, &lm83_group_opt);
943b0830	389
1da177e4 LT	390	return 0;
	391	}
	392
	393	static struct lm83_data lm83_update_device(struct device dev)
	394	{
	395	struct i2c_client *client = to_i2c_client(dev);
	396	struct lm83_data *data = i2c_get_clientdata(client);
	397
9a61bf63	398	mutex_lock(&data->update_lock);
1da177e4 LT	399
	400	if (time_after(jiffies, data->last_updated + HZ * 2) \|\| !data->valid) {
	401	int nr;
	402
	403	dev_dbg(&client->dev, "Updating lm83 data.\n");
1a86c051 JD	404	for (nr = 0; nr < 9; nr++) {
1a86c051 JD	405	data->temp[nr] =
1da177e4 LT	406	i2c_smbus_read_byte_data(client,
1da177e4 LT	407	LM83_REG_R_TEMP[nr]);
1da177e4	408	}
1da177e4 LT	409	data->alarms =
	410	i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS1)
	411	+ (i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS2)
	412	<< 8);
	413
	414	data->last_updated = jiffies;
	415	data->valid = 1;
	416	}
	417
9a61bf63	418	mutex_unlock(&data->update_lock);
1da177e4 LT	419
	420	return data;
	421	}
	422
f0967eea	423	module_i2c_driver(lm83_driver);
1da177e4	424
7c81c60f	425	MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
1da177e4 LT	426	MODULE_DESCRIPTION("LM83 driver");
1da177e4 LT	427	MODULE_LICENSE("GPL");