[deliverable/linux.git] / drivers / hwmon / lm95241.c

/*
 * Copyright (C) 2008, 2010 Davide Rizzo <elpa.rizzo@gmail.com>
 *
 * The LM95241 is a sensor chip made by National Semiconductors.
 * It reports up to three temperatures (its own plus up to two external ones).
 * Complete datasheet can be obtained from National's website at:
 *   http://www.national.com/ds.cgi/LM/LM95241.pdf
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

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

#define DEVNAME "lm95241"

static const unsigned short normal_i2c[] = {
	0x19, 0x2a, 0x2b, I2C_CLIENT_END };

/* LM95241 registers */
#define LM95241_REG_R_MAN_ID		0xFE
#define LM95241_REG_R_CHIP_ID		0xFF
#define LM95241_REG_R_STATUS		0x02
#define LM95241_REG_RW_CONFIG		0x03
#define LM95241_REG_RW_REM_FILTER	0x06
#define LM95241_REG_RW_TRUTHERM		0x07
#define LM95241_REG_W_ONE_SHOT		0x0F
#define LM95241_REG_R_LOCAL_TEMPH	0x10
#define LM95241_REG_R_REMOTE1_TEMPH	0x11
#define LM95241_REG_R_REMOTE2_TEMPH	0x12
#define LM95241_REG_R_LOCAL_TEMPL	0x20
#define LM95241_REG_R_REMOTE1_TEMPL	0x21
#define LM95241_REG_R_REMOTE2_TEMPL	0x22
#define LM95241_REG_RW_REMOTE_MODEL	0x30

/* LM95241 specific bitfields */
#define CFG_STOP 0x40
#define CFG_CR0076 0x00
#define CFG_CR0182 0x10
#define CFG_CR1000 0x20
#define CFG_CR2700 0x30
#define R1MS_SHIFT 0
#define R2MS_SHIFT 2
#define R1MS_MASK (0x01 << (R1MS_SHIFT))
#define R2MS_MASK (0x01 << (R2MS_SHIFT))
#define R1DF_SHIFT 1
#define R2DF_SHIFT 2
#define R1DF_MASK (0x01 << (R1DF_SHIFT))
#define R2DF_MASK (0x01 << (R2DF_SHIFT))
#define R1FE_MASK 0x01
#define R2FE_MASK 0x05
#define TT1_SHIFT 0
#define TT2_SHIFT 4
#define TT_OFF 0
#define TT_ON 1
#define TT_MASK 7
#define NATSEMI_MAN_ID	0x01
#define LM95231_CHIP_ID	0xA1
#define LM95241_CHIP_ID	0xA4

static const u8 lm95241_reg_address[] = {
	LM95241_REG_R_LOCAL_TEMPH,
	LM95241_REG_R_LOCAL_TEMPL,
	LM95241_REG_R_REMOTE1_TEMPH,
	LM95241_REG_R_REMOTE1_TEMPL,
	LM95241_REG_R_REMOTE2_TEMPH,
	LM95241_REG_R_REMOTE2_TEMPL
};

/* Client data (each client gets its own) */
struct lm95241_data {
	struct i2c_client *client;
	struct mutex update_lock;
	unsigned long last_updated, interval;	/* in jiffies */
	char valid;		/* zero until following fields are valid */
	/* registers values */
	u8 temp[ARRAY_SIZE(lm95241_reg_address)];
	u8 config, model, trutherm;
};

/* Conversions */
static int temp_from_reg_signed(u8 val_h, u8 val_l)
{
	s16 val_hl = (val_h << 8) | val_l;
	return val_hl * 1000 / 256;
}

static int temp_from_reg_unsigned(u8 val_h, u8 val_l)
{
	u16 val_hl = (val_h << 8) | val_l;
	return val_hl * 1000 / 256;
}

static struct lm95241_data *lm95241_update_device(struct device *dev)
{
	struct lm95241_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + data->interval) ||
	    !data->valid) {
		int i;

		dev_dbg(dev, "Updating lm95241 data.\n");
		for (i = 0; i < ARRAY_SIZE(lm95241_reg_address); i++)
			data->temp[i]
			  = i2c_smbus_read_byte_data(client,
						     lm95241_reg_address[i]);
		data->last_updated = jiffies;
		data->valid = 1;
	}

	mutex_unlock(&data->update_lock);

	return data;
}

/* Sysfs stuff */
static ssize_t show_input(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	struct lm95241_data *data = lm95241_update_device(dev);
	int index = to_sensor_dev_attr(attr)->index;

	return snprintf(buf, PAGE_SIZE - 1, "%d\n",
			index == 0 || (data->config & (1 << (index / 2))) ?
		temp_from_reg_signed(data->temp[index], data->temp[index + 1]) :
		temp_from_reg_unsigned(data->temp[index],
				       data->temp[index + 1]));
}

static ssize_t show_type(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct lm95241_data *data = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE - 1,
		data->model & to_sensor_dev_attr(attr)->index ? "1\n" : "2\n");
}

static ssize_t set_type(struct device *dev, struct device_attribute *attr,
			const char *buf, size_t count)
{
	struct lm95241_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	unsigned long val;
	int shift;
	u8 mask = to_sensor_dev_attr(attr)->index;

	if (kstrtoul(buf, 10, &val) < 0)
		return -EINVAL;
	if (val != 1 && val != 2)
		return -EINVAL;

	shift = mask == R1MS_MASK ? TT1_SHIFT : TT2_SHIFT;

	mutex_lock(&data->update_lock);

	data->trutherm &= ~(TT_MASK << shift);
	if (val == 1) {
		data->model |= mask;
		data->trutherm |= (TT_ON << shift);
	} else {
		data->model &= ~mask;
		data->trutherm |= (TT_OFF << shift);
	}
	data->valid = 0;

	i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL,
				  data->model);
	i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM,
				  data->trutherm);

	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t show_min(struct device *dev, struct device_attribute *attr,
			char *buf)
{
	struct lm95241_data *data = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE - 1,
			data->config & to_sensor_dev_attr(attr)->index ?
			"-127000\n" : "0\n");
}

static ssize_t set_min(struct device *dev, struct device_attribute *attr,
		       const char *buf, size_t count)
{
	struct lm95241_data *data = dev_get_drvdata(dev);
	long val;

	if (kstrtol(buf, 10, &val) < 0)
		return -EINVAL;
	if (val < -128000)
		return -EINVAL;

	mutex_lock(&data->update_lock);

	if (val < 0)
		data->config |= to_sensor_dev_attr(attr)->index;
	else
		data->config &= ~to_sensor_dev_attr(attr)->index;
	data->valid = 0;

	i2c_smbus_write_byte_data(data->client, LM95241_REG_RW_CONFIG,
				  data->config);

	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t show_max(struct device *dev, struct device_attribute *attr,
			char *buf)
{
	struct lm95241_data *data = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE - 1,
			data->config & to_sensor_dev_attr(attr)->index ?
			"127000\n" : "255000\n");
}

static ssize_t set_max(struct device *dev, struct device_attribute *attr,
		       const char *buf, size_t count)
{
	struct lm95241_data *data = dev_get_drvdata(dev);
	long val;

	if (kstrtol(buf, 10, &val) < 0)
		return -EINVAL;
	if (val >= 256000)
		return -EINVAL;

	mutex_lock(&data->update_lock);

	if (val <= 127000)
		data->config |= to_sensor_dev_attr(attr)->index;
	else
		data->config &= ~to_sensor_dev_attr(attr)->index;
	data->valid = 0;

	i2c_smbus_write_byte_data(data->client, LM95241_REG_RW_CONFIG,
				  data->config);

	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t show_interval(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	struct lm95241_data *data = lm95241_update_device(dev);

	return snprintf(buf, PAGE_SIZE - 1, "%lu\n", 1000 * data->interval
			/ HZ);
}

static ssize_t set_interval(struct device *dev, struct device_attribute *attr,
			    const char *buf, size_t count)
{
	struct lm95241_data *data = dev_get_drvdata(dev);
	unsigned long val;

	if (kstrtoul(buf, 10, &val) < 0)
		return -EINVAL;

	data->interval = val * HZ / 1000;

	return count;
}

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_input, NULL, 2);
static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_input, NULL, 4);
static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type, set_type,
			  R1MS_MASK);
static SENSOR_DEVICE_ATTR(temp3_type, S_IWUSR | S_IRUGO, show_type, set_type,
			  R2MS_MASK);
static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_min, set_min,
			  R1DF_MASK);
static SENSOR_DEVICE_ATTR(temp3_min, S_IWUSR | S_IRUGO, show_min, set_min,
			  R2DF_MASK);
static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_max, set_max,
			  R1DF_MASK);
static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_max, set_max,
			  R2DF_MASK);
static DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, show_interval,
		   set_interval);

static struct attribute *lm95241_attrs[] = {
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp3_input.dev_attr.attr,
	&sensor_dev_attr_temp2_type.dev_attr.attr,
	&sensor_dev_attr_temp3_type.dev_attr.attr,
	&sensor_dev_attr_temp2_min.dev_attr.attr,
	&sensor_dev_attr_temp3_min.dev_attr.attr,
	&sensor_dev_attr_temp2_max.dev_attr.attr,
	&sensor_dev_attr_temp3_max.dev_attr.attr,
	&dev_attr_update_interval.attr,
	NULL
};
ATTRIBUTE_GROUPS(lm95241);

/* Return 0 if detection is successful, -ENODEV otherwise */
static int lm95241_detect(struct i2c_client *new_client,
			  struct i2c_board_info *info)
{
	struct i2c_adapter *adapter = new_client->adapter;
	const char *name;
	int mfg_id, chip_id;

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

	mfg_id = i2c_smbus_read_byte_data(new_client, LM95241_REG_R_MAN_ID);
	if (mfg_id != NATSEMI_MAN_ID)
		return -ENODEV;

	chip_id = i2c_smbus_read_byte_data(new_client, LM95241_REG_R_CHIP_ID);
	switch (chip_id) {
	case LM95231_CHIP_ID:
		name = "lm95231";
		break;
	case LM95241_CHIP_ID:
		name = "lm95241";
		break;
	default:
		return -ENODEV;
	}

	/* Fill the i2c board info */
	strlcpy(info->type, name, I2C_NAME_SIZE);
	return 0;
}

static void lm95241_init_client(struct i2c_client *client,
				struct lm95241_data *data)
{
	data->interval = HZ;	/* 1 sec default */
	data->config = CFG_CR0076;
	data->trutherm = (TT_OFF << TT1_SHIFT) | (TT_OFF << TT2_SHIFT);

	i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config);
	i2c_smbus_write_byte_data(client, LM95241_REG_RW_REM_FILTER,
				  R1FE_MASK | R2FE_MASK);
	i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM,
				  data->trutherm);
	i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL,
				  data->model);
}

static int lm95241_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	struct lm95241_data *data;
	struct device *hwmon_dev;

	data = devm_kzalloc(dev, sizeof(struct lm95241_data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->client = client;
	mutex_init(&data->update_lock);

	/* Initialize the LM95241 chip */
	lm95241_init_client(client, data);

	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
							   data,
							   lm95241_groups);
	return PTR_ERR_OR_ZERO(hwmon_dev);
}

/* Driver data (common to all clients) */
static const struct i2c_device_id lm95241_id[] = {
	{ "lm95231", 0 },
	{ "lm95241", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, lm95241_id);

static struct i2c_driver lm95241_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= DEVNAME,
	},
	.probe		= lm95241_probe,
	.id_table	= lm95241_id,
	.detect		= lm95241_detect,
	.address_list	= normal_i2c,
};

module_i2c_driver(lm95241_driver);

MODULE_AUTHOR("Davide Rizzo <elpa.rizzo@gmail.com>");
MODULE_DESCRIPTION("LM95241 sensor driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
	1	/*
	2	* Copyright (C) 2008, 2010 Davide Rizzo <elpa.rizzo@gmail.com>
	3	*
	4	* The LM95241 is a sensor chip made by National Semiconductors.
	5	* It reports up to three temperatures (its own plus up to two external ones).
	6	* Complete datasheet can be obtained from National's website at:
	7	* http://www.national.com/ds.cgi/LM/LM95241.pdf
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or
	12	* (at your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	22	*/
	23
	24	#include <linux/module.h>
	25	#include <linux/init.h>
	26	#include <linux/slab.h>
	27	#include <linux/jiffies.h>
	28	#include <linux/i2c.h>
	29	#include <linux/hwmon.h>
	30	#include <linux/hwmon-sysfs.h>
	31	#include <linux/err.h>
	32	#include <linux/mutex.h>
	33	#include <linux/sysfs.h>
	34
	35	#define DEVNAME "lm95241"
	36
	37	static const unsigned short normal_i2c[] = {
	38	0x19, 0x2a, 0x2b, I2C_CLIENT_END };
	39
	40	/* LM95241 registers */
	41	#define LM95241_REG_R_MAN_ID 0xFE
	42	#define LM95241_REG_R_CHIP_ID 0xFF
	43	#define LM95241_REG_R_STATUS 0x02
	44	#define LM95241_REG_RW_CONFIG 0x03
	45	#define LM95241_REG_RW_REM_FILTER 0x06
	46	#define LM95241_REG_RW_TRUTHERM 0x07
	47	#define LM95241_REG_W_ONE_SHOT 0x0F
	48	#define LM95241_REG_R_LOCAL_TEMPH 0x10
	49	#define LM95241_REG_R_REMOTE1_TEMPH 0x11
	50	#define LM95241_REG_R_REMOTE2_TEMPH 0x12
	51	#define LM95241_REG_R_LOCAL_TEMPL 0x20
	52	#define LM95241_REG_R_REMOTE1_TEMPL 0x21
	53	#define LM95241_REG_R_REMOTE2_TEMPL 0x22
	54	#define LM95241_REG_RW_REMOTE_MODEL 0x30
	55
	56	/* LM95241 specific bitfields */
	57	#define CFG_STOP 0x40
	58	#define CFG_CR0076 0x00
	59	#define CFG_CR0182 0x10
	60	#define CFG_CR1000 0x20
	61	#define CFG_CR2700 0x30
	62	#define R1MS_SHIFT 0
	63	#define R2MS_SHIFT 2
	64	#define R1MS_MASK (0x01 << (R1MS_SHIFT))
	65	#define R2MS_MASK (0x01 << (R2MS_SHIFT))
	66	#define R1DF_SHIFT 1
	67	#define R2DF_SHIFT 2
	68	#define R1DF_MASK (0x01 << (R1DF_SHIFT))
	69	#define R2DF_MASK (0x01 << (R2DF_SHIFT))
	70	#define R1FE_MASK 0x01
	71	#define R2FE_MASK 0x05
	72	#define TT1_SHIFT 0
	73	#define TT2_SHIFT 4
	74	#define TT_OFF 0
	75	#define TT_ON 1
	76	#define TT_MASK 7
	77	#define NATSEMI_MAN_ID 0x01
	78	#define LM95231_CHIP_ID 0xA1
	79	#define LM95241_CHIP_ID 0xA4
	80
	81	static const u8 lm95241_reg_address[] = {
	82	LM95241_REG_R_LOCAL_TEMPH,
	83	LM95241_REG_R_LOCAL_TEMPL,
	84	LM95241_REG_R_REMOTE1_TEMPH,
	85	LM95241_REG_R_REMOTE1_TEMPL,
	86	LM95241_REG_R_REMOTE2_TEMPH,
	87	LM95241_REG_R_REMOTE2_TEMPL
	88	};
	89
	90	/* Client data (each client gets its own) */
	91	struct lm95241_data {
	92	struct i2c_client *client;
	93	struct mutex update_lock;
	94	unsigned long last_updated, interval; /* in jiffies */
	95	char valid; /* zero until following fields are valid */
	96	/* registers values */
	97	u8 temp[ARRAY_SIZE(lm95241_reg_address)];
	98	u8 config, model, trutherm;
	99	};
	100
	101	/* Conversions */
	102	static int temp_from_reg_signed(u8 val_h, u8 val_l)
	103	{
	104	s16 val_hl = (val_h << 8) \| val_l;
	105	return val_hl * 1000 / 256;
	106	}
	107
	108	static int temp_from_reg_unsigned(u8 val_h, u8 val_l)
	109	{
	110	u16 val_hl = (val_h << 8) \| val_l;
	111	return val_hl * 1000 / 256;
	112	}
	113
	114	static struct lm95241_data lm95241_update_device(struct device dev)
	115	{
	116	struct lm95241_data *data = dev_get_drvdata(dev);
	117	struct i2c_client *client = data->client;
	118
	119	mutex_lock(&data->update_lock);
	120
	121	if (time_after(jiffies, data->last_updated + data->interval) \|\|
	122	!data->valid) {
	123	int i;
	124
	125	dev_dbg(dev, "Updating lm95241 data.\n");
	126	for (i = 0; i < ARRAY_SIZE(lm95241_reg_address); i++)
	127	data->temp[i]
	128	= i2c_smbus_read_byte_data(client,
	129	lm95241_reg_address[i]);
	130	data->last_updated = jiffies;
	131	data->valid = 1;
	132	}
	133
	134	mutex_unlock(&data->update_lock);
	135
	136	return data;
	137	}
	138
	139	/* Sysfs stuff */
	140	static ssize_t show_input(struct device dev, struct device_attribute attr,
	141	char *buf)
	142	{
	143	struct lm95241_data *data = lm95241_update_device(dev);
	144	int index = to_sensor_dev_attr(attr)->index;
	145
	146	return snprintf(buf, PAGE_SIZE - 1, "%d\n",
	147	index == 0 \|\| (data->config & (1 << (index / 2))) ?
	148	temp_from_reg_signed(data->temp[index], data->temp[index + 1]) :
	149	temp_from_reg_unsigned(data->temp[index],
	150	data->temp[index + 1]));
	151	}
	152
	153	static ssize_t show_type(struct device dev, struct device_attribute attr,
	154	char *buf)
	155	{
	156	struct lm95241_data *data = dev_get_drvdata(dev);
	157
	158	return snprintf(buf, PAGE_SIZE - 1,
	159	data->model & to_sensor_dev_attr(attr)->index ? "1\n" : "2\n");
	160	}
	161
	162	static ssize_t set_type(struct device dev, struct device_attribute attr,
	163	const char *buf, size_t count)
	164	{
	165	struct lm95241_data *data = dev_get_drvdata(dev);
	166	struct i2c_client *client = data->client;
	167	unsigned long val;
	168	int shift;
	169	u8 mask = to_sensor_dev_attr(attr)->index;
	170
	171	if (kstrtoul(buf, 10, &val) < 0)
	172	return -EINVAL;
	173	if (val != 1 && val != 2)
	174	return -EINVAL;
	175
	176	shift = mask == R1MS_MASK ? TT1_SHIFT : TT2_SHIFT;
	177
	178	mutex_lock(&data->update_lock);
	179
	180	data->trutherm &= ~(TT_MASK << shift);
	181	if (val == 1) {
	182	data->model \|= mask;
	183	data->trutherm \|= (TT_ON << shift);
	184	} else {
	185	data->model &= ~mask;
	186	data->trutherm \|= (TT_OFF << shift);
	187	}
	188	data->valid = 0;
	189
	190	i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL,
	191	data->model);
	192	i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM,
	193	data->trutherm);
	194
	195	mutex_unlock(&data->update_lock);
	196
	197	return count;
	198	}
	199
	200	static ssize_t show_min(struct device dev, struct device_attribute attr,
	201	char *buf)
	202	{
	203	struct lm95241_data *data = dev_get_drvdata(dev);
	204
	205	return snprintf(buf, PAGE_SIZE - 1,
	206	data->config & to_sensor_dev_attr(attr)->index ?
	207	"-127000\n" : "0\n");
	208	}
	209
	210	static ssize_t set_min(struct device dev, struct device_attribute attr,
	211	const char *buf, size_t count)
	212	{
	213	struct lm95241_data *data = dev_get_drvdata(dev);
	214	long val;
	215
	216	if (kstrtol(buf, 10, &val) < 0)
	217	return -EINVAL;
	218	if (val < -128000)
	219	return -EINVAL;
	220
	221	mutex_lock(&data->update_lock);
	222
	223	if (val < 0)
	224	data->config \|= to_sensor_dev_attr(attr)->index;
	225	else
	226	data->config &= ~to_sensor_dev_attr(attr)->index;
	227	data->valid = 0;
	228
	229	i2c_smbus_write_byte_data(data->client, LM95241_REG_RW_CONFIG,
	230	data->config);
	231
	232	mutex_unlock(&data->update_lock);
	233
	234	return count;
	235	}
	236
	237	static ssize_t show_max(struct device dev, struct device_attribute attr,
	238	char *buf)
	239	{
	240	struct lm95241_data *data = dev_get_drvdata(dev);
	241
	242	return snprintf(buf, PAGE_SIZE - 1,
	243	data->config & to_sensor_dev_attr(attr)->index ?
	244	"127000\n" : "255000\n");
	245	}
	246
	247	static ssize_t set_max(struct device dev, struct device_attribute attr,
	248	const char *buf, size_t count)
	249	{
	250	struct lm95241_data *data = dev_get_drvdata(dev);
	251	long val;
	252
	253	if (kstrtol(buf, 10, &val) < 0)
	254	return -EINVAL;
	255	if (val >= 256000)
	256	return -EINVAL;
	257
	258	mutex_lock(&data->update_lock);
	259
	260	if (val <= 127000)
	261	data->config \|= to_sensor_dev_attr(attr)->index;
	262	else
	263	data->config &= ~to_sensor_dev_attr(attr)->index;
	264	data->valid = 0;
	265
	266	i2c_smbus_write_byte_data(data->client, LM95241_REG_RW_CONFIG,
	267	data->config);
	268
	269	mutex_unlock(&data->update_lock);
	270
	271	return count;
	272	}
	273
	274	static ssize_t show_interval(struct device dev, struct device_attribute attr,
	275	char *buf)
	276	{
	277	struct lm95241_data *data = lm95241_update_device(dev);
	278
	279	return snprintf(buf, PAGE_SIZE - 1, "%lu\n", 1000 * data->interval
	280	/ HZ);
	281	}
	282
	283	static ssize_t set_interval(struct device dev, struct device_attribute attr,
	284	const char *buf, size_t count)
	285	{
	286	struct lm95241_data *data = dev_get_drvdata(dev);
	287	unsigned long val;
	288
	289	if (kstrtoul(buf, 10, &val) < 0)
	290	return -EINVAL;
	291
	292	data->interval = val * HZ / 1000;
	293
	294	return count;
	295	}
	296
	297	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 0);
	298	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_input, NULL, 2);
	299	static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_input, NULL, 4);
	300	static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR \| S_IRUGO, show_type, set_type,
	301	R1MS_MASK);
	302	static SENSOR_DEVICE_ATTR(temp3_type, S_IWUSR \| S_IRUGO, show_type, set_type,
	303	R2MS_MASK);
	304	static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR \| S_IRUGO, show_min, set_min,
	305	R1DF_MASK);
	306	static SENSOR_DEVICE_ATTR(temp3_min, S_IWUSR \| S_IRUGO, show_min, set_min,
	307	R2DF_MASK);
	308	static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR \| S_IRUGO, show_max, set_max,
	309	R1DF_MASK);
	310	static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR \| S_IRUGO, show_max, set_max,
	311	R2DF_MASK);
	312	static DEVICE_ATTR(update_interval, S_IWUSR \| S_IRUGO, show_interval,
	313	set_interval);
	314
	315	static struct attribute *lm95241_attrs[] = {
	316	&sensor_dev_attr_temp1_input.dev_attr.attr,
	317	&sensor_dev_attr_temp2_input.dev_attr.attr,
	318	&sensor_dev_attr_temp3_input.dev_attr.attr,
	319	&sensor_dev_attr_temp2_type.dev_attr.attr,
	320	&sensor_dev_attr_temp3_type.dev_attr.attr,
	321	&sensor_dev_attr_temp2_min.dev_attr.attr,
	322	&sensor_dev_attr_temp3_min.dev_attr.attr,
	323	&sensor_dev_attr_temp2_max.dev_attr.attr,
	324	&sensor_dev_attr_temp3_max.dev_attr.attr,
	325	&dev_attr_update_interval.attr,
	326	NULL
	327	};
	328	ATTRIBUTE_GROUPS(lm95241);
	329
	330	/* Return 0 if detection is successful, -ENODEV otherwise */
	331	static int lm95241_detect(struct i2c_client *new_client,
	332	struct i2c_board_info *info)
	333	{
	334	struct i2c_adapter *adapter = new_client->adapter;
	335	const char *name;
	336	int mfg_id, chip_id;
	337
	338	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	339	return -ENODEV;
	340
	341	mfg_id = i2c_smbus_read_byte_data(new_client, LM95241_REG_R_MAN_ID);
	342	if (mfg_id != NATSEMI_MAN_ID)
	343	return -ENODEV;
	344
	345	chip_id = i2c_smbus_read_byte_data(new_client, LM95241_REG_R_CHIP_ID);
	346	switch (chip_id) {
	347	case LM95231_CHIP_ID:
	348	name = "lm95231";
	349	break;
	350	case LM95241_CHIP_ID:
	351	name = "lm95241";
	352	break;
	353	default:
	354	return -ENODEV;
	355	}
	356
	357	/* Fill the i2c board info */
	358	strlcpy(info->type, name, I2C_NAME_SIZE);
	359	return 0;
	360	}
	361
	362	static void lm95241_init_client(struct i2c_client *client,
	363	struct lm95241_data *data)
	364	{
	365	data->interval = HZ; /* 1 sec default */
	366	data->config = CFG_CR0076;
	367	data->trutherm = (TT_OFF << TT1_SHIFT) \| (TT_OFF << TT2_SHIFT);
	368
	369	i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config);
	370	i2c_smbus_write_byte_data(client, LM95241_REG_RW_REM_FILTER,
	371	R1FE_MASK \| R2FE_MASK);
	372	i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM,
	373	data->trutherm);
	374	i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL,
	375	data->model);
	376	}
	377
	378	static int lm95241_probe(struct i2c_client *client,
	379	const struct i2c_device_id *id)
	380	{
	381	struct device *dev = &client->dev;
	382	struct lm95241_data *data;
	383	struct device *hwmon_dev;
	384
	385	data = devm_kzalloc(dev, sizeof(struct lm95241_data), GFP_KERNEL);
	386	if (!data)
	387	return -ENOMEM;
	388
	389	data->client = client;
	390	mutex_init(&data->update_lock);
	391
	392	/* Initialize the LM95241 chip */
	393	lm95241_init_client(client, data);
	394
	395	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
	396	data,
	397	lm95241_groups);
	398	return PTR_ERR_OR_ZERO(hwmon_dev);
	399	}
	400
	401	/* Driver data (common to all clients) */
	402	static const struct i2c_device_id lm95241_id[] = {
	403	{ "lm95231", 0 },
	404	{ "lm95241", 0 },
	405	{ }
	406	};
	407	MODULE_DEVICE_TABLE(i2c, lm95241_id);
	408
	409	static struct i2c_driver lm95241_driver = {
	410	.class = I2C_CLASS_HWMON,
	411	.driver = {
	412	.name = DEVNAME,
	413	},
	414	.probe = lm95241_probe,
	415	.id_table = lm95241_id,
	416	.detect = lm95241_detect,
	417	.address_list = normal_i2c,
	418	};
	419
	420	module_i2c_driver(lm95241_driver);
	421
	422	MODULE_AUTHOR("Davide Rizzo <elpa.rizzo@gmail.com>");
	423	MODULE_DESCRIPTION("LM95241 sensor driver");
	424	MODULE_LICENSE("GPL");