[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		(-256000 / 250)
#define LM73_TEMP_MAX		(255750 / 250)

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


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 = clamp_val(temp / 250, LM73_TEMP_MIN, LM73_TEMP_MAX) << 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	38	#define DRVNAME "lm73"
91bba688 GR	39	#define LM73_TEMP_MIN (-256000 / 250)
91bba688 GR	40	#define LM73_TEMP_MAX (255750 / 250)
4e233cbe AD	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 */
91bba688	59	value = clamp_val(temp / 250, LM73_TEMP_MIN, LM73_TEMP_MAX) << 5;
0602934f CV	60	err = i2c_smbus_write_word_swapped(client, attr->index, value);
0602934f CV	61	return (err < 0) ? err : count;
4e233cbe AD	62	}
	63
	64	static ssize_t show_temp(struct device dev, struct device_attribute da,
	65	char *buf)
	66	{
	67	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	68	struct i2c_client *client = to_i2c_client(dev);
0602934f CV	69	int temp;
	70
	71	s32 err = i2c_smbus_read_word_swapped(client, attr->index);
	72	if (err < 0)
	73	return err;
	74
4e233cbe AD	75	/* use integer division instead of equivalent right shift to
4e233cbe AD	76	guarantee arithmetic shift and preserve the sign */
0602934f CV	77	temp = (((s16) err) * 250) / 32;
0602934f CV	78	return scnprintf(buf, PAGE_SIZE, "%d\n", temp);
4e233cbe AD	79	}
	80
	81
	82	/-----------------------------------------------------------------------/
	83
	84	/* sysfs attributes for hwmon */
	85
	86	static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR \| S_IRUGO,
	87	show_temp, set_temp, LM73_REG_MAX);
	88	static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR \| S_IRUGO,
	89	show_temp, set_temp, LM73_REG_MIN);
	90	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
	91	show_temp, NULL, LM73_REG_INPUT);
	92
	93
	94	static struct attribute *lm73_attributes[] = {
	95	&sensor_dev_attr_temp1_input.dev_attr.attr,
	96	&sensor_dev_attr_temp1_max.dev_attr.attr,
	97	&sensor_dev_attr_temp1_min.dev_attr.attr,
	98
	99	NULL
	100	};
	101
	102	static const struct attribute_group lm73_group = {
	103	.attrs = lm73_attributes,
	104	};
	105
	106	/-----------------------------------------------------------------------/
	107
	108	/* device probe and removal */
	109
	110	static int
	111	lm73_probe(struct i2c_client client, const struct i2c_device_id id)
	112	{
	113	struct device *hwmon_dev;
	114	int status;
	115
	116	/* Register sysfs hooks */
	117	status = sysfs_create_group(&client->dev.kobj, &lm73_group);
	118	if (status)
	119	return status;
	120
	121	hwmon_dev = hwmon_device_register(&client->dev);
	122	if (IS_ERR(hwmon_dev)) {
	123	status = PTR_ERR(hwmon_dev);
	124	goto exit_remove;
	125	}
	126	i2c_set_clientdata(client, hwmon_dev);
	127
	128	dev_info(&client->dev, "%s: sensor '%s'\n",
	129	dev_name(hwmon_dev), client->name);
	130
	131	return 0;
	132
	133	exit_remove:
	134	sysfs_remove_group(&client->dev.kobj, &lm73_group);
	135	return status;
	136	}
	137
	138	static int lm73_remove(struct i2c_client *client)
	139	{
	140	struct device *hwmon_dev = i2c_get_clientdata(client);
	141
	142	hwmon_device_unregister(hwmon_dev);
143	sysfs_remove_group(&client->dev.kobj, &lm73_group);
4e233cbe AD	144	return 0;
	145	}
	146
	147	static const struct i2c_device_id lm73_ids[] = {
1f86df49	148	{ "lm73", 0 },
4e233cbe AD	149	{ /* LIST END */ }
	150	};
	151	MODULE_DEVICE_TABLE(i2c, lm73_ids);
	152
	153	/* Return 0 if detection is successful, -ENODEV otherwise */
310ec792	154	static int lm73_detect(struct i2c_client *new_client,
4e233cbe AD	155	struct i2c_board_info *info)
	156	{
	157	struct i2c_adapter *adapter = new_client->adapter;
24d6e2a8	158	int id, ctrl, conf;
4e233cbe AD	159
	160	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA \|
	161	I2C_FUNC_SMBUS_WORD_DATA))
	162	return -ENODEV;
	163
24d6e2a8 JD	164	/*
	165	* Do as much detection as possible with byte reads first, as word
	166	* reads can confuse other devices.
	167	*/
	168	ctrl = i2c_smbus_read_byte_data(new_client, LM73_REG_CTRL);
	169	if (ctrl < 0 \|\| (ctrl & 0x10))
	170	return -ENODEV;
	171
	172	conf = i2c_smbus_read_byte_data(new_client, LM73_REG_CONF);
	173	if (conf < 0 \|\| (conf & 0x0c))
	174	return -ENODEV;
	175
	176	id = i2c_smbus_read_byte_data(new_client, LM73_REG_ID);
	177	if (id < 0 \|\| id != (LM73_ID & 0xff))
	178	return -ENODEV;
	179
4e233cbe AD	180	/* Check device ID */
4e233cbe AD	181	id = i2c_smbus_read_word_data(new_client, LM73_REG_ID);
24d6e2a8	182	if (id < 0 \|\| id != LM73_ID)
4e233cbe AD	183	return -ENODEV;
	184
	185	strlcpy(info->type, "lm73", I2C_NAME_SIZE);
	186
	187	return 0;
	188	}
	189
	190	static struct i2c_driver lm73_driver = {
	191	.class = I2C_CLASS_HWMON,
	192	.driver = {
	193	.name = "lm73",
	194	},
	195	.probe = lm73_probe,
	196	.remove = lm73_remove,
	197	.id_table = lm73_ids,
	198	.detect = lm73_detect,
c3813d6a	199	.address_list = normal_i2c,
4e233cbe AD	200	};
4e233cbe AD	201
f0967eea	202	module_i2c_driver(lm73_driver);
4e233cbe AD	203
	204	MODULE_AUTHOR("Guillaume Ligneul <guillaume.ligneul@gmail.com>");
	205	MODULE_DESCRIPTION("LM73 driver");
	206	MODULE_LICENSE("GPL");