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

/*
 * lm83.c - Part of lm_sensors, Linux kernel modules for hardware
 *          monitoring
 * Copyright (C) 2003-2009  Jean Delvare <[email protected]>
 *
 * 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,
};

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

struct lm83_data {
	struct i2c_client *client;
	const struct attribute_group *groups[3];
	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 */
};

static struct lm83_data *lm83_update_device(struct device *dev)
{
	struct lm83_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->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;
}

/*
 * 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 lm83_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->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 alarms_show(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_RO(alarms);

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 device *hwmon_dev;
	struct lm83_data *data;

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

	data->client = new_client;
	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.
	 */
	data->groups[0] = &lm83_group;
	if (id->driver_data == lm83)
		data->groups[1] = &lm83_group_opt;

	hwmon_dev = devm_hwmon_device_register_with_groups(&new_client->dev,
							   new_client->name,
							   data, data->groups);
	return PTR_ERR_OR_ZERO(hwmon_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,
	.id_table	= lm83_id,
	.detect		= lm83_detect,
	.address_list	= normal_i2c,
};

module_i2c_driver(lm83_driver);

MODULE_AUTHOR("Jean Delvare <[email protected]>");
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 <[email protected]>
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	};
1da177e4 LT	108
1da177e4 LT	109	/*
	110	* Client data (each client gets its own)
	111	*/
	112
	113	struct lm83_data {
a0ac840d GR	114	struct i2c_client *client;
a0ac840d GR	115	const struct attribute_group *groups[3];
9a61bf63	116	struct mutex update_lock;
1da177e4 LT	117	char valid; /* zero until following fields are valid */
	118	unsigned long last_updated; /* in jiffies */
	119
	120	/* registers values */
1a86c051 JD	121	s8 temp[9]; /* 0..3: input 1-4,
	122	4..7: high limit 1-4,
	123	8 : critical limit */
1da177e4 LT	124	u16 alarms; /* bitvector, combined */
	125	};
	126
41936370 GR	127	static struct lm83_data lm83_update_device(struct device dev)
41936370 GR	128	{
a0ac840d GR	129	struct lm83_data *data = dev_get_drvdata(dev);
a0ac840d GR	130	struct i2c_client *client = data->client;
41936370 GR	131
	132	mutex_lock(&data->update_lock);
	133
	134	if (time_after(jiffies, data->last_updated + HZ * 2) \|\| !data->valid) {
	135	int nr;
	136
	137	dev_dbg(&client->dev, "Updating lm83 data.\n");
	138	for (nr = 0; nr < 9; nr++) {
	139	data->temp[nr] =
	140	i2c_smbus_read_byte_data(client,
	141	LM83_REG_R_TEMP[nr]);
	142	}
	143	data->alarms =
	144	i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS1)
	145	+ (i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS2)
	146	<< 8);
	147
	148	data->last_updated = jiffies;
	149	data->valid = 1;
	150	}
	151
	152	mutex_unlock(&data->update_lock);
	153
	154	return data;
	155	}
	156
1da177e4 LT	157	/*
	158	* Sysfs stuff
	159	*/
	160
1a86c051 JD	161	static ssize_t show_temp(struct device dev, struct device_attribute devattr,
	162	char *buf)
	163	{
	164	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	165	struct lm83_data *data = lm83_update_device(dev);
	166	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
1da177e4	167	}
1a86c051 JD	168
	169	static ssize_t set_temp(struct device dev, struct device_attribute devattr,
	170	const char *buf, size_t count)
	171	{
	172	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
a0ac840d GR	173	struct lm83_data *data = dev_get_drvdata(dev);
a0ac840d GR	174	struct i2c_client *client = data->client;
b3789a0d	175	long val;
1a86c051	176	int nr = attr->index;
b3789a0d FM	177	int err;
	178
	179	err = kstrtol(buf, 10, &val);
	180	if (err < 0)
	181	return err;
1a86c051	182
9a61bf63	183	mutex_lock(&data->update_lock);
1a86c051 JD	184	data->temp[nr] = TEMP_TO_REG(val);
	185	i2c_smbus_write_byte_data(client, LM83_REG_W_HIGH[nr - 4],
	186	data->temp[nr]);
9a61bf63	187	mutex_unlock(&data->update_lock);
1a86c051	188	return count;
1da177e4	189	}
1da177e4	190
14c05198	191	static ssize_t alarms_show(struct device dev, struct device_attribute dummy,
1a86c051	192	char *buf)
1da177e4 LT	193	{
	194	struct lm83_data *data = lm83_update_device(dev);
	195	return sprintf(buf, "%d\n", data->alarms);
	196	}
	197
2d45771e JD	198	static ssize_t show_alarm(struct device *dev, struct device_attribute
	199	devattr, char buf)
	200	{
	201	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	202	struct lm83_data *data = lm83_update_device(dev);
	203	int bitnr = attr->index;
	204
	205	return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
	206	}
	207
1a86c051 JD	208	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
	209	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
	210	static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
	211	static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
	212	static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR \| S_IRUGO, show_temp,
	213	set_temp, 4);
	214	static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR \| S_IRUGO, show_temp,
	215	set_temp, 5);
	216	static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR \| S_IRUGO, show_temp,
	217	set_temp, 6);
	218	static SENSOR_DEVICE_ATTR(temp4_max, S_IWUSR \| S_IRUGO, show_temp,
	219	set_temp, 7);
	220	static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL, 8);
	221	static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp, NULL, 8);
	222	static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR \| S_IRUGO, show_temp,
	223	set_temp, 8);
	224	static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO, show_temp, NULL, 8);
2d45771e JD	225
	226	/* Individual alarm files */
	227	static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0);
	228	static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
7817a39e	229	static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2);
2d45771e JD	230	static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 4);
	231	static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
	232	static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 8);
	233	static SENSOR_DEVICE_ATTR(temp4_crit_alarm, S_IRUGO, show_alarm, NULL, 9);
7817a39e	234	static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_alarm, NULL, 10);
2d45771e	235	static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 12);
7817a39e	236	static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 13);
2d45771e JD	237	static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 15);
2d45771e JD	238	/* Raw alarm file for compatibility */
14c05198	239	static DEVICE_ATTR_RO(alarms);
1da177e4	240
0e39e01c JD	241	static struct attribute *lm83_attributes[] = {
	242	&sensor_dev_attr_temp1_input.dev_attr.attr,
	243	&sensor_dev_attr_temp3_input.dev_attr.attr,
	244	&sensor_dev_attr_temp1_max.dev_attr.attr,
	245	&sensor_dev_attr_temp3_max.dev_attr.attr,
	246	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	247	&sensor_dev_attr_temp3_crit.dev_attr.attr,
	248
	249	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	250	&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
7817a39e	251	&sensor_dev_attr_temp3_fault.dev_attr.attr,
0e39e01c JD	252	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
	253	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	254	&dev_attr_alarms.attr,
	255	NULL
	256	};
	257
	258	static const struct attribute_group lm83_group = {
	259	.attrs = lm83_attributes,
	260	};
	261
	262	static struct attribute *lm83_attributes_opt[] = {
	263	&sensor_dev_attr_temp2_input.dev_attr.attr,
	264	&sensor_dev_attr_temp4_input.dev_attr.attr,
	265	&sensor_dev_attr_temp2_max.dev_attr.attr,
	266	&sensor_dev_attr_temp4_max.dev_attr.attr,
	267	&sensor_dev_attr_temp2_crit.dev_attr.attr,
	268	&sensor_dev_attr_temp4_crit.dev_attr.attr,
	269
	270	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	271	&sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
7817a39e	272	&sensor_dev_attr_temp4_fault.dev_attr.attr,
0e39e01c	273	&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
7817a39e	274	&sensor_dev_attr_temp2_fault.dev_attr.attr,
0e39e01c JD	275	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	276	NULL
	277	};
	278
	279	static const struct attribute_group lm83_group_opt = {
	280	.attrs = lm83_attributes_opt,
	281	};
	282
1da177e4 LT	283	/*
	284	* Real code
	285	*/
	286
b6aacdce	287	/* Return 0 if detection is successful, -ENODEV otherwise */
310ec792	288	static int lm83_detect(struct i2c_client *new_client,
b6aacdce	289	struct i2c_board_info *info)
1da177e4	290	{
b6aacdce	291	struct i2c_adapter *adapter = new_client->adapter;
b57dc394 JD	292	const char *name;
b57dc394 JD	293	u8 man_id, chip_id;
1da177e4 LT	294
1da177e4 LT	295	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
b6aacdce	296	return -ENODEV;
1da177e4	297
b57dc394 JD	298	/* Detection */
	299	if ((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS1) & 0xA8) \|\|
	300	(i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS2) & 0x48) \|\|
	301	(i2c_smbus_read_byte_data(new_client, LM83_REG_R_CONFIG) & 0x41)) {
	302	dev_dbg(&adapter->dev, "LM83 detection failed at 0x%02x\n",
	303	new_client->addr);
	304	return -ENODEV;
1da177e4 LT	305	}
1da177e4 LT	306
b57dc394 JD	307	/* Identification */
	308	man_id = i2c_smbus_read_byte_data(new_client, LM83_REG_R_MAN_ID);
	309	if (man_id != 0x01) /* National Semiconductor */
	310	return -ENODEV;
1da177e4	311
b57dc394 JD	312	chip_id = i2c_smbus_read_byte_data(new_client, LM83_REG_R_CHIP_ID);
	313	switch (chip_id) {
	314	case 0x03:
1da177e4	315	name = "lm83";
b57dc394 JD	316	break;
b57dc394 JD	317	case 0x01:
43cb7ebe	318	name = "lm82";
b57dc394 JD	319	break;
	320	default:
	321	/* identification failed */
	322	dev_info(&adapter->dev,
	323	"Unsupported chip (man_id=0x%02X, chip_id=0x%02X)\n",
	324	man_id, chip_id);
	325	return -ENODEV;
1da177e4 LT	326	}
1da177e4 LT	327
b6aacdce JD	328	strlcpy(info->type, name, I2C_NAME_SIZE);
	329
	330	return 0;
	331	}
	332
	333	static int lm83_probe(struct i2c_client *new_client,
	334	const struct i2c_device_id *id)
	335	{
a0ac840d	336	struct device *hwmon_dev;
b6aacdce	337	struct lm83_data *data;
b6aacdce	338
c087f73a GR	339	data = devm_kzalloc(&new_client->dev, sizeof(struct lm83_data),
	340	GFP_KERNEL);
	341	if (!data)
	342	return -ENOMEM;
b6aacdce	343
a0ac840d	344	data->client = new_client;
9a61bf63	345	mutex_init(&data->update_lock);
1da177e4	346
1da177e4	347	/*
0e39e01c	348	* Register sysfs hooks
43cb7ebe JC	349	* The LM82 can only monitor one external diode which is
	350	* at the same register as the LM83 temp3 entry - so we
	351	* declare 1 and 3 common, and then 2 and 4 only for the LM83.
	352	*/
a0ac840d GR	353	data->groups[0] = &lm83_group;
	354	if (id->driver_data == lm83)
	355	data->groups[1] = &lm83_group_opt;
	356
	357	hwmon_dev = devm_hwmon_device_register_with_groups(&new_client->dev,
	358	new_client->name,
	359	data, data->groups);
	360	return PTR_ERR_OR_ZERO(hwmon_dev);
1da177e4 LT	361	}
1da177e4 LT	362
41936370 GR	363	/*
	364	* Driver data (common to all clients)
	365	*/
1da177e4	366
41936370 GR	367	static const struct i2c_device_id lm83_id[] = {
	368	{ "lm83", lm83 },
	369	{ "lm82", lm82 },
	370	{ }
	371	};
	372	MODULE_DEVICE_TABLE(i2c, lm83_id);
1da177e4	373
41936370 GR	374	static struct i2c_driver lm83_driver = {
	375	.class = I2C_CLASS_HWMON,
	376	.driver = {
	377	.name = "lm83",
	378	},
	379	.probe = lm83_probe,
41936370 GR	380	.id_table = lm83_id,
	381	.detect = lm83_detect,
	382	.address_list = normal_i2c,
	383	};
1da177e4	384
f0967eea	385	module_i2c_driver(lm83_driver);
1da177e4	386
7c81c60f	387	MODULE_AUTHOR("Jean Delvare <[email protected]>");
1da177e4 LT	388	MODULE_DESCRIPTION("LM83 driver");
1da177e4 LT	389	MODULE_LICENSE("GPL");