[deliverable/linux.git] / drivers / hwmon / lm73.c

/*
 * LM73 Sensor driver
 * Based on LM75
 *
 * Copyright (C) 2007, CenoSYS (www.cenosys.com).
 * Copyright (C) 2009, Bollore telecom (www.bolloretelecom.eu).
 *
 * Guillaume Ligneul <guillaume.ligneul@gmail.com>
 * Adrien Demarez <adrien.demarez@bolloretelecom.eu>
 * Jeremy Laine <jeremy.laine@bolloretelecom.eu>
 *
 * This software program is licensed subject to the GNU General Public License
 * (GPL).Version 2,June 1991, available at
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>


/* Addresses scanned */
static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4c,
					0x4d, 0x4e, I2C_CLIENT_END };

/* LM73 registers */
#define LM73_REG_INPUT		0x00
#define LM73_REG_CONF		0x01
#define LM73_REG_MAX		0x02
#define LM73_REG_MIN		0x03
#define LM73_REG_CTRL		0x04
#define LM73_REG_ID		0x07

#define LM73_ID			0x9001	/* 0x0190, byte-swapped */
#define DRVNAME			"lm73"
#define LM73_TEMP_MIN		(-40)
#define LM73_TEMP_MAX		150

/*-----------------------------------------------------------------------*/


static ssize_t set_temp(struct device *dev, struct device_attribute *da,
			const char *buf, size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct i2c_client *client = to_i2c_client(dev);
	long temp;
	short value;
	s32 err;

	int status = kstrtol(buf, 10, &temp);
	if (status < 0)
		return status;

	/* Write value */
	value = (short) clamp_val(temp / 250, LM73_TEMP_MIN * 4,
				  LM73_TEMP_MAX * 4) << 5;
	err = i2c_smbus_write_word_swapped(client, attr->index, value);
	return (err < 0) ? err : count;
}

static ssize_t show_temp(struct device *dev, struct device_attribute *da,
			 char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct i2c_client *client = to_i2c_client(dev);
	int temp;

	s32 err = i2c_smbus_read_word_swapped(client, attr->index);
	if (err < 0)
		return err;

	/* use integer division instead of equivalent right shift to
	   guarantee arithmetic shift and preserve the sign */
	temp = (((s16) err) * 250) / 32;
	return scnprintf(buf, PAGE_SIZE, "%d\n", temp);
}


/*-----------------------------------------------------------------------*/

/* sysfs attributes for hwmon */

static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
			show_temp, set_temp, LM73_REG_MAX);
static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO,
			show_temp, set_temp, LM73_REG_MIN);
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
			show_temp, NULL, LM73_REG_INPUT);


static struct attribute *lm73_attributes[] = {
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp1_min.dev_attr.attr,

	NULL
};

static const struct attribute_group lm73_group = {
	.attrs = lm73_attributes,
};

/*-----------------------------------------------------------------------*/

/* device probe and removal */

static int
lm73_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
	struct device *hwmon_dev;
	int status;

	/* Register sysfs hooks */
	status = sysfs_create_group(&client->dev.kobj, &lm73_group);
	if (status)
		return status;

	hwmon_dev = hwmon_device_register(&client->dev);
	if (IS_ERR(hwmon_dev)) {
		status = PTR_ERR(hwmon_dev);
		goto exit_remove;
	}
	i2c_set_clientdata(client, hwmon_dev);

	dev_info(&client->dev, "%s: sensor '%s'\n",
		 dev_name(hwmon_dev), client->name);

	return 0;

exit_remove:
	sysfs_remove_group(&client->dev.kobj, &lm73_group);
	return status;
}

static int lm73_remove(struct i2c_client *client)
{
	struct device *hwmon_dev = i2c_get_clientdata(client);

	hwmon_device_unregister(hwmon_dev);
	sysfs_remove_group(&client->dev.kobj, &lm73_group);
	return 0;
}

static const struct i2c_device_id lm73_ids[] = {
	{ "lm73", 0 },
	{ /* LIST END */ }
};
MODULE_DEVICE_TABLE(i2c, lm73_ids);

/* Return 0 if detection is successful, -ENODEV otherwise */
static int lm73_detect(struct i2c_client *new_client,
			struct i2c_board_info *info)
{
	struct i2c_adapter *adapter = new_client->adapter;
	int id, ctrl, conf;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
					I2C_FUNC_SMBUS_WORD_DATA))
		return -ENODEV;

	/*
	 * Do as much detection as possible with byte reads first, as word
	 * reads can confuse other devices.
	 */
	ctrl = i2c_smbus_read_byte_data(new_client, LM73_REG_CTRL);
	if (ctrl < 0 || (ctrl & 0x10))
		return -ENODEV;

	conf = i2c_smbus_read_byte_data(new_client, LM73_REG_CONF);
	if (conf < 0 || (conf & 0x0c))
		return -ENODEV;

	id = i2c_smbus_read_byte_data(new_client, LM73_REG_ID);
	if (id < 0 || id != (LM73_ID & 0xff))
		return -ENODEV;

	/* Check device ID */
	id = i2c_smbus_read_word_data(new_client, LM73_REG_ID);
	if (id < 0 || id != LM73_ID)
		return -ENODEV;

	strlcpy(info->type, "lm73", I2C_NAME_SIZE);

	return 0;
}

static struct i2c_driver lm73_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "lm73",
	},
	.probe		= lm73_probe,
	.remove		= lm73_remove,
	.id_table	= lm73_ids,
	.detect		= lm73_detect,
	.address_list	= normal_i2c,
};

module_i2c_driver(lm73_driver);

MODULE_AUTHOR("Guillaume Ligneul <guillaume.ligneul@gmail.com>");
MODULE_DESCRIPTION("LM73 driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
4e233cbe AD	1	/*
	2	* LM73 Sensor driver
	3	* Based on LM75
	4	*
	5	* Copyright (C) 2007, CenoSYS (www.cenosys.com).
	6	* Copyright (C) 2009, Bollore telecom (www.bolloretelecom.eu).
	7	*
	8	* Guillaume Ligneul <guillaume.ligneul@gmail.com>
	9	* Adrien Demarez <adrien.demarez@bolloretelecom.eu>
	10	* Jeremy Laine <jeremy.laine@bolloretelecom.eu>
	11	*
	12	* This software program is licensed subject to the GNU General Public License
	13	* (GPL).Version 2,June 1991, available at
	14	* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
	15	*/
	16
	17	#include <linux/module.h>
	18	#include <linux/init.h>
4e233cbe AD	19	#include <linux/i2c.h>
	20	#include <linux/hwmon.h>
	21	#include <linux/hwmon-sysfs.h>
	22	#include <linux/err.h>
	23
	24
	25	/* Addresses scanned */
	26	static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4c,
	27	0x4d, 0x4e, I2C_CLIENT_END };
	28
4e233cbe AD	29	/* LM73 registers */
	30	#define LM73_REG_INPUT 0x00
	31	#define LM73_REG_CONF 0x01
	32	#define LM73_REG_MAX 0x02
	33	#define LM73_REG_MIN 0x03
	34	#define LM73_REG_CTRL 0x04
	35	#define LM73_REG_ID 0x07
	36
90f4102c	37	#define LM73_ID 0x9001 /* 0x0190, byte-swapped */
4e233cbe AD	38	#define DRVNAME "lm73"
	39	#define LM73_TEMP_MIN (-40)
	40	#define LM73_TEMP_MAX 150
	41
	42	/-----------------------------------------------------------------------/
	43
	44
	45	static ssize_t set_temp(struct device dev, struct device_attribute da,
	46	const char *buf, size_t count)
	47	{
	48	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	49	struct i2c_client *client = to_i2c_client(dev);
	50	long temp;
	51	short value;
0602934f	52	s32 err;
4e233cbe	53
179c4fdb	54	int status = kstrtol(buf, 10, &temp);
4e233cbe AD	55	if (status < 0)
	56	return status;
	57
	58	/* Write value */
2a844c14 GR	59	value = (short) clamp_val(temp / 250, LM73_TEMP_MIN * 4,
2a844c14 GR	60	LM73_TEMP_MAX * 4) << 5;
0602934f CV	61	err = i2c_smbus_write_word_swapped(client, attr->index, value);
0602934f CV	62	return (err < 0) ? err : count;
4e233cbe AD	63	}
	64
	65	static ssize_t show_temp(struct device dev, struct device_attribute da,
	66	char *buf)
	67	{
	68	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	69	struct i2c_client *client = to_i2c_client(dev);
0602934f CV	70	int temp;
	71
	72	s32 err = i2c_smbus_read_word_swapped(client, attr->index);
	73	if (err < 0)
	74	return err;
	75
4e233cbe AD	76	/* use integer division instead of equivalent right shift to
4e233cbe AD	77	guarantee arithmetic shift and preserve the sign */
0602934f CV	78	temp = (((s16) err) * 250) / 32;
0602934f CV	79	return scnprintf(buf, PAGE_SIZE, "%d\n", temp);
4e233cbe AD	80	}
	81
	82
	83	/-----------------------------------------------------------------------/
	84
	85	/* sysfs attributes for hwmon */
	86
	87	static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR \| S_IRUGO,
	88	show_temp, set_temp, LM73_REG_MAX);
	89	static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR \| S_IRUGO,
	90	show_temp, set_temp, LM73_REG_MIN);
	91	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
	92	show_temp, NULL, LM73_REG_INPUT);
	93
	94
	95	static struct attribute *lm73_attributes[] = {
	96	&sensor_dev_attr_temp1_input.dev_attr.attr,
	97	&sensor_dev_attr_temp1_max.dev_attr.attr,
	98	&sensor_dev_attr_temp1_min.dev_attr.attr,
	99
	100	NULL
	101	};
	102
	103	static const struct attribute_group lm73_group = {
	104	.attrs = lm73_attributes,
	105	};
	106
	107	/-----------------------------------------------------------------------/
	108
	109	/* device probe and removal */
	110
	111	static int
	112	lm73_probe(struct i2c_client client, const struct i2c_device_id id)
	113	{
	114	struct device *hwmon_dev;
	115	int status;
	116
	117	/* Register sysfs hooks */
	118	status = sysfs_create_group(&client->dev.kobj, &lm73_group);
	119	if (status)
	120	return status;
	121
	122	hwmon_dev = hwmon_device_register(&client->dev);
	123	if (IS_ERR(hwmon_dev)) {
	124	status = PTR_ERR(hwmon_dev);
	125	goto exit_remove;
	126	}
	127	i2c_set_clientdata(client, hwmon_dev);
	128
	129	dev_info(&client->dev, "%s: sensor '%s'\n",
	130	dev_name(hwmon_dev), client->name);
	131
	132	return 0;
	133
	134	exit_remove:
	135	sysfs_remove_group(&client->dev.kobj, &lm73_group);
	136	return status;
	137	}
	138
	139	static int lm73_remove(struct i2c_client *client)
	140	{
	141	struct device *hwmon_dev = i2c_get_clientdata(client);
	142
	143	hwmon_device_unregister(hwmon_dev);
144	sysfs_remove_group(&client->dev.kobj, &lm73_group);
4e233cbe AD	145	return 0;
	146	}
	147
	148	static const struct i2c_device_id lm73_ids[] = {
1f86df49	149	{ "lm73", 0 },
4e233cbe AD	150	{ /* LIST END */ }
	151	};
	152	MODULE_DEVICE_TABLE(i2c, lm73_ids);
	153
	154	/* Return 0 if detection is successful, -ENODEV otherwise */
310ec792	155	static int lm73_detect(struct i2c_client *new_client,
4e233cbe AD	156	struct i2c_board_info *info)
	157	{
	158	struct i2c_adapter *adapter = new_client->adapter;
24d6e2a8	159	int id, ctrl, conf;
4e233cbe AD	160
	161	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA \|
	162	I2C_FUNC_SMBUS_WORD_DATA))
	163	return -ENODEV;
	164
24d6e2a8 JD	165	/*
	166	* Do as much detection as possible with byte reads first, as word
	167	* reads can confuse other devices.
	168	*/
	169	ctrl = i2c_smbus_read_byte_data(new_client, LM73_REG_CTRL);
	170	if (ctrl < 0 \|\| (ctrl & 0x10))
	171	return -ENODEV;
	172
	173	conf = i2c_smbus_read_byte_data(new_client, LM73_REG_CONF);
	174	if (conf < 0 \|\| (conf & 0x0c))
	175	return -ENODEV;
	176
	177	id = i2c_smbus_read_byte_data(new_client, LM73_REG_ID);
	178	if (id < 0 \|\| id != (LM73_ID & 0xff))
	179	return -ENODEV;
	180
4e233cbe AD	181	/* Check device ID */
4e233cbe AD	182	id = i2c_smbus_read_word_data(new_client, LM73_REG_ID);
24d6e2a8	183	if (id < 0 \|\| id != LM73_ID)
4e233cbe AD	184	return -ENODEV;
	185
	186	strlcpy(info->type, "lm73", I2C_NAME_SIZE);
	187
	188	return 0;
	189	}
	190
	191	static struct i2c_driver lm73_driver = {
	192	.class = I2C_CLASS_HWMON,
	193	.driver = {
	194	.name = "lm73",
	195	},
	196	.probe = lm73_probe,
	197	.remove = lm73_remove,
	198	.id_table = lm73_ids,
	199	.detect = lm73_detect,
c3813d6a	200	.address_list = normal_i2c,
4e233cbe AD	201	};
4e233cbe AD	202
f0967eea	203	module_i2c_driver(lm73_driver);
4e233cbe AD	204
	205	MODULE_AUTHOR("Guillaume Ligneul <guillaume.ligneul@gmail.com>");
	206	MODULE_DESCRIPTION("LM73 driver");
	207	MODULE_LICENSE("GPL");