[mirror_ubuntu-jammy-kernel.git] / drivers / hwmon / lm83.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * 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
 */

#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 temp_show(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 temp_store(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 alarm_show(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_RO(temp1_input, temp, 0);
static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 3);
static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, 4);
static SENSOR_DEVICE_ATTR_RW(temp2_max, temp, 5);
static SENSOR_DEVICE_ATTR_RW(temp3_max, temp, 6);
static SENSOR_DEVICE_ATTR_RW(temp4_max, temp, 7);
static SENSOR_DEVICE_ATTR_RO(temp1_crit, temp, 8);
static SENSOR_DEVICE_ATTR_RO(temp2_crit, temp, 8);
static SENSOR_DEVICE_ATTR_RW(temp3_crit, temp, 8);
static SENSOR_DEVICE_ATTR_RO(temp4_crit, temp, 8);

/* Individual alarm files */
static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 0);
static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, alarm, 1);
static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 2);
static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, alarm, 4);
static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 6);
static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 8);
static SENSOR_DEVICE_ATTR_RO(temp4_crit_alarm, alarm, 9);
static SENSOR_DEVICE_ATTR_RO(temp4_fault, alarm, 10);
static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, alarm, 12);
static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 13);
static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 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 const struct i2c_device_id lm83_id[];

static int lm83_probe(struct i2c_client *new_client)
{
	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 (i2c_match_id(lm83_id, new_client)->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_new	= lm83_probe,
	.id_table	= lm83_id,
	.detect		= lm83_detect,
	.address_list	= normal_i2c,
};

module_i2c_driver(lm83_driver);

MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
MODULE_DESCRIPTION("LM83 driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
c942fddf	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/*
	3	* lm83.c - Part of lm_sensors, Linux kernel modules for hardware
	4	* monitoring
7c81c60f	5	* Copyright (C) 2003-2009 Jean Delvare <jdelvare@suse.de>
1da177e4 LT	6	*
	7	* Heavily inspired from the lm78, lm75 and adm1021 drivers. The LM83 is
	8	* a sensor chip made by National Semiconductor. It reports up to four
	9	* temperatures (its own plus up to three external ones) with a 1 deg
	10	* resolution and a 3-4 deg accuracy. Complete datasheet can be obtained
	11	* from National's website at:
	12	* http://www.national.com/pf/LM/LM83.html
	13	* Since the datasheet omits to give the chip stepping code, I give it
	14	* here: 0x03 (at register 0xff).
	15	*
43cb7ebe JC	16	* Also supports the LM82 temp sensor, which is basically a stripped down
	17	* model of the LM83. Datasheet is here:
	18	* http://www.national.com/pf/LM/LM82.html
1da177e4 LT	19	*/
1da177e4 LT	20
1da177e4 LT	21	#include <linux/module.h>
	22	#include <linux/init.h>
	23	#include <linux/slab.h>
	24	#include <linux/jiffies.h>
	25	#include <linux/i2c.h>
10c08f81	26	#include <linux/hwmon-sysfs.h>
943b0830 MH	27	#include <linux/hwmon.h>
943b0830 MH	28	#include <linux/err.h>
9a61bf63	29	#include <linux/mutex.h>
0e39e01c	30	#include <linux/sysfs.h>
1da177e4 LT	31
	32	/*
	33	* Addresses to scan
	34	* Address is selected using 2 three-level pins, resulting in 9 possible
	35	* addresses.
	36	*/
	37
25e9c86d MH	38	static const unsigned short normal_i2c[] = {
25e9c86d MH	39	0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
1da177e4	40
e5e9f44c	41	enum chips { lm83, lm82 };
1da177e4 LT	42
	43	/*
	44	* The LM83 registers
	45	* Manufacturer ID is 0x01 for National Semiconductor.
	46	*/
	47
	48	#define LM83_REG_R_MAN_ID 0xFE
	49	#define LM83_REG_R_CHIP_ID 0xFF
	50	#define LM83_REG_R_CONFIG 0x03
	51	#define LM83_REG_W_CONFIG 0x09
	52	#define LM83_REG_R_STATUS1 0x02
	53	#define LM83_REG_R_STATUS2 0x35
	54	#define LM83_REG_R_LOCAL_TEMP 0x00
	55	#define LM83_REG_R_LOCAL_HIGH 0x05
	56	#define LM83_REG_W_LOCAL_HIGH 0x0B
	57	#define LM83_REG_R_REMOTE1_TEMP 0x30
	58	#define LM83_REG_R_REMOTE1_HIGH 0x38
	59	#define LM83_REG_W_REMOTE1_HIGH 0x50
	60	#define LM83_REG_R_REMOTE2_TEMP 0x01
	61	#define LM83_REG_R_REMOTE2_HIGH 0x07
	62	#define LM83_REG_W_REMOTE2_HIGH 0x0D
	63	#define LM83_REG_R_REMOTE3_TEMP 0x31
	64	#define LM83_REG_R_REMOTE3_HIGH 0x3A
	65	#define LM83_REG_W_REMOTE3_HIGH 0x52
	66	#define LM83_REG_R_TCRIT 0x42
	67	#define LM83_REG_W_TCRIT 0x5A
	68
	69	/*
	70	* Conversions and various macros
44bbe87e	71	* The LM83 uses signed 8-bit values with LSB = 1 degree Celsius.
1da177e4 LT	72	*/
	73
	74	#define TEMP_FROM_REG(val) ((val) * 1000)
	75	#define TEMP_TO_REG(val) ((val) <= -128000 ? -128 : \
	76	(val) >= 127000 ? 127 : \
	77	(val) < 0 ? ((val) - 500) / 1000 : \
	78	((val) + 500) / 1000)
	79
	80	static const u8 LM83_REG_R_TEMP[] = {
	81	LM83_REG_R_LOCAL_TEMP,
	82	LM83_REG_R_REMOTE1_TEMP,
	83	LM83_REG_R_REMOTE2_TEMP,
1a86c051	84	LM83_REG_R_REMOTE3_TEMP,
1da177e4 LT	85	LM83_REG_R_LOCAL_HIGH,
	86	LM83_REG_R_REMOTE1_HIGH,
	87	LM83_REG_R_REMOTE2_HIGH,
1a86c051 JD	88	LM83_REG_R_REMOTE3_HIGH,
1a86c051 JD	89	LM83_REG_R_TCRIT,
1da177e4 LT	90	};
	91
	92	static const u8 LM83_REG_W_HIGH[] = {
	93	LM83_REG_W_LOCAL_HIGH,
	94	LM83_REG_W_REMOTE1_HIGH,
	95	LM83_REG_W_REMOTE2_HIGH,
1a86c051 JD	96	LM83_REG_W_REMOTE3_HIGH,
1a86c051 JD	97	LM83_REG_W_TCRIT,
1da177e4 LT	98	};
1da177e4 LT	99
1da177e4 LT	100	/*
	101	* Client data (each client gets its own)
	102	*/
	103
	104	struct lm83_data {
a0ac840d GR	105	struct i2c_client *client;
a0ac840d GR	106	const struct attribute_group *groups[3];
9a61bf63	107	struct mutex update_lock;
1da177e4 LT	108	char valid; /* zero until following fields are valid */
	109	unsigned long last_updated; /* in jiffies */
	110
	111	/* registers values */
1a86c051 JD	112	s8 temp[9]; /* 0..3: input 1-4,
	113	4..7: high limit 1-4,
	114	8 : critical limit */
1da177e4 LT	115	u16 alarms; /* bitvector, combined */
	116	};
	117
41936370 GR	118	static struct lm83_data lm83_update_device(struct device dev)
41936370 GR	119	{
a0ac840d GR	120	struct lm83_data *data = dev_get_drvdata(dev);
a0ac840d GR	121	struct i2c_client *client = data->client;
41936370 GR	122
	123	mutex_lock(&data->update_lock);
	124
	125	if (time_after(jiffies, data->last_updated + HZ * 2) \|\| !data->valid) {
	126	int nr;
	127
	128	dev_dbg(&client->dev, "Updating lm83 data.\n");
	129	for (nr = 0; nr < 9; nr++) {
	130	data->temp[nr] =
	131	i2c_smbus_read_byte_data(client,
	132	LM83_REG_R_TEMP[nr]);
	133	}
	134	data->alarms =
	135	i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS1)
	136	+ (i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS2)
	137	<< 8);
	138
	139	data->last_updated = jiffies;
	140	data->valid = 1;
	141	}
	142
	143	mutex_unlock(&data->update_lock);
	144
	145	return data;
	146	}
	147
1da177e4 LT	148	/*
	149	* Sysfs stuff
	150	*/
	151
a9283c8f	152	static ssize_t temp_show(struct device dev, struct device_attribute devattr,
1a86c051 JD	153	char *buf)
	154	{
	155	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	156	struct lm83_data *data = lm83_update_device(dev);
	157	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
1da177e4	158	}
1a86c051	159
a9283c8f GR	160	static ssize_t temp_store(struct device *dev,
	161	struct device_attribute devattr, const char buf,
	162	size_t count)
1a86c051 JD	163	{
1a86c051 JD	164	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
a0ac840d GR	165	struct lm83_data *data = dev_get_drvdata(dev);
a0ac840d GR	166	struct i2c_client *client = data->client;
b3789a0d	167	long val;
1a86c051	168	int nr = attr->index;
b3789a0d FM	169	int err;
	170
	171	err = kstrtol(buf, 10, &val);
	172	if (err < 0)
	173	return err;
1a86c051	174
9a61bf63	175	mutex_lock(&data->update_lock);
1a86c051 JD	176	data->temp[nr] = TEMP_TO_REG(val);
	177	i2c_smbus_write_byte_data(client, LM83_REG_W_HIGH[nr - 4],
	178	data->temp[nr]);
9a61bf63	179	mutex_unlock(&data->update_lock);
1a86c051	180	return count;
1da177e4	181	}
1da177e4	182
14c05198	183	static ssize_t alarms_show(struct device dev, struct device_attribute dummy,
1a86c051	184	char *buf)
1da177e4 LT	185	{
	186	struct lm83_data *data = lm83_update_device(dev);
	187	return sprintf(buf, "%d\n", data->alarms);
	188	}
	189
a9283c8f GR	190	static ssize_t alarm_show(struct device *dev,
a9283c8f GR	191	struct device_attribute devattr, char buf)
2d45771e JD	192	{
	193	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	194	struct lm83_data *data = lm83_update_device(dev);
	195	int bitnr = attr->index;
	196
	197	return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
	198	}
	199
a9283c8f GR	200	static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
	201	static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
	202	static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
	203	static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 3);
	204	static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, 4);
	205	static SENSOR_DEVICE_ATTR_RW(temp2_max, temp, 5);
	206	static SENSOR_DEVICE_ATTR_RW(temp3_max, temp, 6);
	207	static SENSOR_DEVICE_ATTR_RW(temp4_max, temp, 7);
	208	static SENSOR_DEVICE_ATTR_RO(temp1_crit, temp, 8);
	209	static SENSOR_DEVICE_ATTR_RO(temp2_crit, temp, 8);
	210	static SENSOR_DEVICE_ATTR_RW(temp3_crit, temp, 8);
	211	static SENSOR_DEVICE_ATTR_RO(temp4_crit, temp, 8);
2d45771e JD	212
2d45771e JD	213	/* Individual alarm files */
a9283c8f GR	214	static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 0);
	215	static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, alarm, 1);
	216	static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 2);
	217	static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, alarm, 4);
	218	static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 6);
	219	static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 8);
	220	static SENSOR_DEVICE_ATTR_RO(temp4_crit_alarm, alarm, 9);
	221	static SENSOR_DEVICE_ATTR_RO(temp4_fault, alarm, 10);
	222	static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, alarm, 12);
	223	static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 13);
	224	static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 15);
2d45771e	225	/* Raw alarm file for compatibility */
14c05198	226	static DEVICE_ATTR_RO(alarms);
1da177e4	227
0e39e01c JD	228	static struct attribute *lm83_attributes[] = {
	229	&sensor_dev_attr_temp1_input.dev_attr.attr,
	230	&sensor_dev_attr_temp3_input.dev_attr.attr,
	231	&sensor_dev_attr_temp1_max.dev_attr.attr,
	232	&sensor_dev_attr_temp3_max.dev_attr.attr,
	233	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	234	&sensor_dev_attr_temp3_crit.dev_attr.attr,
	235
	236	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	237	&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
7817a39e	238	&sensor_dev_attr_temp3_fault.dev_attr.attr,
0e39e01c JD	239	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
	240	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	241	&dev_attr_alarms.attr,
	242	NULL
	243	};
	244
	245	static const struct attribute_group lm83_group = {
	246	.attrs = lm83_attributes,
	247	};
	248
	249	static struct attribute *lm83_attributes_opt[] = {
	250	&sensor_dev_attr_temp2_input.dev_attr.attr,
	251	&sensor_dev_attr_temp4_input.dev_attr.attr,
	252	&sensor_dev_attr_temp2_max.dev_attr.attr,
	253	&sensor_dev_attr_temp4_max.dev_attr.attr,
	254	&sensor_dev_attr_temp2_crit.dev_attr.attr,
	255	&sensor_dev_attr_temp4_crit.dev_attr.attr,
	256
	257	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	258	&sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
7817a39e	259	&sensor_dev_attr_temp4_fault.dev_attr.attr,
0e39e01c	260	&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
7817a39e	261	&sensor_dev_attr_temp2_fault.dev_attr.attr,
0e39e01c JD	262	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	263	NULL
	264	};
	265
	266	static const struct attribute_group lm83_group_opt = {
	267	.attrs = lm83_attributes_opt,
	268	};
	269
1da177e4 LT	270	/*
	271	* Real code
	272	*/
	273
b6aacdce	274	/* Return 0 if detection is successful, -ENODEV otherwise */
310ec792	275	static int lm83_detect(struct i2c_client *new_client,
b6aacdce	276	struct i2c_board_info *info)
1da177e4	277	{
b6aacdce	278	struct i2c_adapter *adapter = new_client->adapter;
b57dc394 JD	279	const char *name;
b57dc394 JD	280	u8 man_id, chip_id;
1da177e4 LT	281
1da177e4 LT	282	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
b6aacdce	283	return -ENODEV;
1da177e4	284
b57dc394 JD	285	/* Detection */
	286	if ((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS1) & 0xA8) \|\|
	287	(i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS2) & 0x48) \|\|
	288	(i2c_smbus_read_byte_data(new_client, LM83_REG_R_CONFIG) & 0x41)) {
	289	dev_dbg(&adapter->dev, "LM83 detection failed at 0x%02x\n",
	290	new_client->addr);
	291	return -ENODEV;
1da177e4 LT	292	}
1da177e4 LT	293
b57dc394 JD	294	/* Identification */
	295	man_id = i2c_smbus_read_byte_data(new_client, LM83_REG_R_MAN_ID);
	296	if (man_id != 0x01) /* National Semiconductor */
	297	return -ENODEV;
1da177e4	298
b57dc394 JD	299	chip_id = i2c_smbus_read_byte_data(new_client, LM83_REG_R_CHIP_ID);
	300	switch (chip_id) {
	301	case 0x03:
1da177e4	302	name = "lm83";
b57dc394 JD	303	break;
b57dc394 JD	304	case 0x01:
43cb7ebe	305	name = "lm82";
b57dc394 JD	306	break;
	307	default:
	308	/* identification failed */
	309	dev_info(&adapter->dev,
	310	"Unsupported chip (man_id=0x%02X, chip_id=0x%02X)\n",
	311	man_id, chip_id);
	312	return -ENODEV;
1da177e4 LT	313	}
1da177e4 LT	314
b6aacdce JD	315	strlcpy(info->type, name, I2C_NAME_SIZE);
	316
	317	return 0;
	318	}
	319
67487038 SK	320	static const struct i2c_device_id lm83_id[];
	321
	322	static int lm83_probe(struct i2c_client *new_client)
b6aacdce	323	{
a0ac840d	324	struct device *hwmon_dev;
b6aacdce	325	struct lm83_data *data;
b6aacdce	326
c087f73a GR	327	data = devm_kzalloc(&new_client->dev, sizeof(struct lm83_data),
	328	GFP_KERNEL);
	329	if (!data)
	330	return -ENOMEM;
b6aacdce	331
a0ac840d	332	data->client = new_client;
9a61bf63	333	mutex_init(&data->update_lock);
1da177e4	334
1da177e4	335	/*
0e39e01c	336	* Register sysfs hooks
43cb7ebe JC	337	* The LM82 can only monitor one external diode which is
	338	* at the same register as the LM83 temp3 entry - so we
	339	* declare 1 and 3 common, and then 2 and 4 only for the LM83.
	340	*/
a0ac840d	341	data->groups[0] = &lm83_group;
67487038	342	if (i2c_match_id(lm83_id, new_client)->driver_data == lm83)
a0ac840d GR	343	data->groups[1] = &lm83_group_opt;
	344
	345	hwmon_dev = devm_hwmon_device_register_with_groups(&new_client->dev,
	346	new_client->name,
	347	data, data->groups);
	348	return PTR_ERR_OR_ZERO(hwmon_dev);
1da177e4 LT	349	}
1da177e4 LT	350
41936370 GR	351	/*
	352	* Driver data (common to all clients)
	353	*/
1da177e4	354
41936370 GR	355	static const struct i2c_device_id lm83_id[] = {
	356	{ "lm83", lm83 },
	357	{ "lm82", lm82 },
	358	{ }
	359	};
	360	MODULE_DEVICE_TABLE(i2c, lm83_id);
1da177e4	361
41936370 GR	362	static struct i2c_driver lm83_driver = {
	363	.class = I2C_CLASS_HWMON,
	364	.driver = {
	365	.name = "lm83",
	366	},
67487038	367	.probe_new = lm83_probe,
41936370 GR	368	.id_table = lm83_id,
	369	.detect = lm83_detect,
	370	.address_list = normal_i2c,
	371	};
1da177e4	372
f0967eea	373	module_i2c_driver(lm83_driver);
1da177e4	374
7c81c60f	375	MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
1da177e4 LT	376	MODULE_DESCRIPTION("LM83 driver");
1da177e4 LT	377	MODULE_LICENSE("GPL");