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

/*
 * Copyright (C) 2008, 2010 Davide Rizzo <[email protected]>
 *
 * 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 device *hwmon_dev;
	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 i2c_client *client = to_i2c_client(dev);
	struct lm95241_data *data = i2c_get_clientdata(client);

	mutex_lock(&data->update_lock);

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

		dev_dbg(&client->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 i2c_client *client = to_i2c_client(dev);
	struct lm95241_data *data = i2c_get_clientdata(client);

	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 i2c_client *client = to_i2c_client(dev);
	struct lm95241_data *data = i2c_get_clientdata(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 i2c_client *client = to_i2c_client(dev);
	struct lm95241_data *data = i2c_get_clientdata(client);

	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 i2c_client *client = to_i2c_client(dev);
	struct lm95241_data *data = i2c_get_clientdata(client);
	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(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 i2c_client *client = to_i2c_client(dev);
	struct lm95241_data *data = i2c_get_clientdata(client);

	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 i2c_client *client = to_i2c_client(dev);
	struct lm95241_data *data = i2c_get_clientdata(client);
	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(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 i2c_client *client = to_i2c_client(dev);
	struct lm95241_data *data = i2c_get_clientdata(client);
	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_attributes[] = {
	&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
};

static const struct attribute_group lm95241_group = {
	.attrs = lm95241_attributes,
};

/* 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 = i2c_get_clientdata(client);

	data->interval = HZ;	/* 1 sec default */
	data->valid = 0;
	data->config = CFG_CR0076;
	data->model = 0;
	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 *new_client,
			 const struct i2c_device_id *id)
{
	struct lm95241_data *data;
	int err;

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

	i2c_set_clientdata(new_client, data);
	mutex_init(&data->update_lock);

	/* Initialize the LM95241 chip */
	lm95241_init_client(new_client);

	/* Register sysfs hooks */
	err = sysfs_create_group(&new_client->dev.kobj, &lm95241_group);
	if (err)
		return err;

	data->hwmon_dev = hwmon_device_register(&new_client->dev);
	if (IS_ERR(data->hwmon_dev)) {
		err = PTR_ERR(data->hwmon_dev);
		goto exit_remove_files;
	}

	return 0;

exit_remove_files:
	sysfs_remove_group(&new_client->dev.kobj, &lm95241_group);
	return err;
}

static int lm95241_remove(struct i2c_client *client)
{
	struct lm95241_data *data = i2c_get_clientdata(client);

	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&client->dev.kobj, &lm95241_group);

	return 0;
}

/* 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,
	.remove		= lm95241_remove,
	.id_table	= lm95241_id,
	.detect		= lm95241_detect,
	.address_list	= normal_i2c,
};

module_i2c_driver(lm95241_driver);

MODULE_AUTHOR("Davide Rizzo <[email protected]>");
MODULE_DESCRIPTION("LM95241 sensor driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
06160327	1	/*
0f1deb4b	2	* Copyright (C) 2008, 2010 Davide Rizzo <[email protected]>
06160327	3	*
0f1deb4b DR	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:
06160327 DR	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
0f1deb4b DR	35	#define DEVNAME "lm95241"
0f1deb4b DR	36
06160327	37	static const unsigned short normal_i2c[] = {
0f1deb4b	38	0x19, 0x2a, 0x2b, I2C_CLIENT_END };
06160327	39
06160327 DR	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
0f1deb4b	47	#define LM95241_REG_W_ONE_SHOT 0x0F
06160327 DR	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
8c1d0419 GR	77	#define NATSEMI_MAN_ID 0x01
	78	#define LM95231_CHIP_ID 0xA1
	79	#define LM95241_CHIP_ID 0xA4
06160327	80
0f1deb4b DR	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	};
06160327	89
06160327 DR	90	/* Client data (each client gets its own) */
06160327 DR	91	struct lm95241_data {
06160327 DR	92	struct device *hwmon_dev;
06160327 DR	93	struct mutex update_lock;
0f1deb4b DR	94	unsigned long last_updated, interval; /* in jiffies */
0f1deb4b DR	95	char valid; /* zero until following fields are valid */
06160327	96	/* registers values */
0f1deb4b	97	u8 temp[ARRAY_SIZE(lm95241_reg_address)];
06160327 DR	98	u8 config, model, trutherm;
	99	};
	100
0f1deb4b	101	/* Conversions */
0c2a40e2	102	static int temp_from_reg_signed(u8 val_h, u8 val_l)
0f1deb4b	103	{
0c2a40e2 GR	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;
0f1deb4b DR	112	}
	113
	114	static struct lm95241_data lm95241_update_device(struct device dev)
	115	{
	116	struct i2c_client *client = to_i2c_client(dev);
	117	struct lm95241_data *data = i2c_get_clientdata(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(&client->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
06160327	139	/* Sysfs stuff */
0f1deb4b DR	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);
0c2a40e2	144	int index = to_sensor_dev_attr(attr)->index;
0f1deb4b DR	145
0f1deb4b DR	146	return snprintf(buf, PAGE_SIZE - 1, "%d\n",
0c2a40e2 GR	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]));
06160327	151	}
06160327	152
0f1deb4b	153	static ssize_t show_type(struct device dev, struct device_attribute attr,
06160327 DR	154	char *buf)
06160327 DR	155	{
0f1deb4b DR	156	struct i2c_client *client = to_i2c_client(dev);
0f1deb4b DR	157	struct lm95241_data *data = i2c_get_clientdata(client);
06160327	158
0f1deb4b DR	159	return snprintf(buf, PAGE_SIZE - 1,
0f1deb4b DR	160	data->model & to_sensor_dev_attr(attr)->index ? "1\n" : "2\n");
06160327 DR	161	}
06160327 DR	162
0f1deb4b	163	static ssize_t set_type(struct device dev, struct device_attribute attr,
06160327 DR	164	const char *buf, size_t count)
	165	{
	166	struct i2c_client *client = to_i2c_client(dev);
	167	struct lm95241_data *data = i2c_get_clientdata(client);
61ec2da5	168	unsigned long val;
0f1deb4b DR	169	int shift;
0f1deb4b DR	170	u8 mask = to_sensor_dev_attr(attr)->index;
06160327	171
179c4fdb	172	if (kstrtoul(buf, 10, &val) < 0)
61ec2da5	173	return -EINVAL;
0f1deb4b DR	174	if (val != 1 && val != 2)
0f1deb4b DR	175	return -EINVAL;
61ec2da5	176
0f1deb4b DR	177	shift = mask == R1MS_MASK ? TT1_SHIFT : TT2_SHIFT;
	178
	179	mutex_lock(&data->update_lock);
	180
	181	data->trutherm &= ~(TT_MASK << shift);
	182	if (val == 1) {
	183	data->model \|= mask;
	184	data->trutherm \|= (TT_ON << shift);
	185	} else {
	186	data->model &= ~mask;
	187	data->trutherm \|= (TT_OFF << shift);
	188	}
	189	data->valid = 0;
	190
	191	i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL,
	192	data->model);
	193	i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM,
	194	data->trutherm);
	195
	196	mutex_unlock(&data->update_lock);
06160327 DR	197
	198	return count;
	199	}
	200
0f1deb4b DR	201	static ssize_t show_min(struct device dev, struct device_attribute attr,
	202	char *buf)
	203	{
	204	struct i2c_client *client = to_i2c_client(dev);
	205	struct lm95241_data *data = i2c_get_clientdata(client);
	206
	207	return snprintf(buf, PAGE_SIZE - 1,
	208	data->config & to_sensor_dev_attr(attr)->index ?
	209	"-127000\n" : "0\n");
06160327	210	}
0f1deb4b DR	211
	212	static ssize_t set_min(struct device dev, struct device_attribute attr,
	213	const char *buf, size_t count)
	214	{
	215	struct i2c_client *client = to_i2c_client(dev);
	216	struct lm95241_data *data = i2c_get_clientdata(client);
	217	long val;
	218
179c4fdb	219	if (kstrtol(buf, 10, &val) < 0)
0f1deb4b DR	220	return -EINVAL;
	221	if (val < -128000)
	222	return -EINVAL;
	223
	224	mutex_lock(&data->update_lock);
	225
	226	if (val < 0)
	227	data->config \|= to_sensor_dev_attr(attr)->index;
	228	else
	229	data->config &= ~to_sensor_dev_attr(attr)->index;
	230	data->valid = 0;
	231
	232	i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config);
	233
	234	mutex_unlock(&data->update_lock);
	235
	236	return count;
06160327	237	}
0f1deb4b DR	238
	239	static ssize_t show_max(struct device dev, struct device_attribute attr,
	240	char *buf)
	241	{
	242	struct i2c_client *client = to_i2c_client(dev);
	243	struct lm95241_data *data = i2c_get_clientdata(client);
	244
	245	return snprintf(buf, PAGE_SIZE - 1,
	246	data->config & to_sensor_dev_attr(attr)->index ?
	247	"127000\n" : "255000\n");
06160327	248	}
0f1deb4b DR	249
	250	static ssize_t set_max(struct device dev, struct device_attribute attr,
	251	const char *buf, size_t count)
	252	{
	253	struct i2c_client *client = to_i2c_client(dev);
	254	struct lm95241_data *data = i2c_get_clientdata(client);
	255	long val;
	256
179c4fdb	257	if (kstrtol(buf, 10, &val) < 0)
0f1deb4b DR	258	return -EINVAL;
	259	if (val >= 256000)
	260	return -EINVAL;
	261
	262	mutex_lock(&data->update_lock);
	263
	264	if (val <= 127000)
	265	data->config \|= to_sensor_dev_attr(attr)->index;
	266	else
	267	data->config &= ~to_sensor_dev_attr(attr)->index;
	268	data->valid = 0;
	269
	270	i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config);
	271
	272	mutex_unlock(&data->update_lock);
	273
	274	return count;
06160327	275	}
0f1deb4b DR	276
	277	static ssize_t show_interval(struct device dev, struct device_attribute attr,
	278	char *buf)
	279	{
	280	struct lm95241_data *data = lm95241_update_device(dev);
	281
	282	return snprintf(buf, PAGE_SIZE - 1, "%lu\n", 1000 * data->interval
	283	/ HZ);
06160327	284	}
0f1deb4b DR	285
	286	static ssize_t set_interval(struct device dev, struct device_attribute attr,
	287	const char *buf, size_t count)
	288	{
	289	struct i2c_client *client = to_i2c_client(dev);
	290	struct lm95241_data *data = i2c_get_clientdata(client);
	291	unsigned long val;
	292
179c4fdb	293	if (kstrtoul(buf, 10, &val) < 0)
0f1deb4b DR	294	return -EINVAL;
	295
	296	data->interval = val * HZ / 1000;
	297
	298	return count;
06160327	299	}
0f1deb4b DR	300
	301	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 0);
	302	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_input, NULL, 2);
	303	static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_input, NULL, 4);
	304	static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR \| S_IRUGO, show_type, set_type,
	305	R1MS_MASK);
	306	static SENSOR_DEVICE_ATTR(temp3_type, S_IWUSR \| S_IRUGO, show_type, set_type,
	307	R2MS_MASK);
	308	static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR \| S_IRUGO, show_min, set_min,
	309	R1DF_MASK);
	310	static SENSOR_DEVICE_ATTR(temp3_min, S_IWUSR \| S_IRUGO, show_min, set_min,
	311	R2DF_MASK);
	312	static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR \| S_IRUGO, show_max, set_max,
	313	R1DF_MASK);
	314	static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR \| S_IRUGO, show_max, set_max,
	315	R2DF_MASK);
bc482bf0 GR	316	static DEVICE_ATTR(update_interval, S_IWUSR \| S_IRUGO, show_interval,
bc482bf0 GR	317	set_interval);
06160327 DR	318
06160327 DR	319	static struct attribute *lm95241_attributes[] = {
0f1deb4b DR	320	&sensor_dev_attr_temp1_input.dev_attr.attr,
	321	&sensor_dev_attr_temp2_input.dev_attr.attr,
	322	&sensor_dev_attr_temp3_input.dev_attr.attr,
	323	&sensor_dev_attr_temp2_type.dev_attr.attr,
	324	&sensor_dev_attr_temp3_type.dev_attr.attr,
	325	&sensor_dev_attr_temp2_min.dev_attr.attr,
	326	&sensor_dev_attr_temp3_min.dev_attr.attr,
	327	&sensor_dev_attr_temp2_max.dev_attr.attr,
	328	&sensor_dev_attr_temp3_max.dev_attr.attr,
bc482bf0	329	&dev_attr_update_interval.attr,
06160327 DR	330	NULL
	331	};
	332
	333	static const struct attribute_group lm95241_group = {
	334	.attrs = lm95241_attributes,
	335	};
	336
797eaa4b	337	/* Return 0 if detection is successful, -ENODEV otherwise */
310ec792	338	static int lm95241_detect(struct i2c_client *new_client,
797eaa4b	339	struct i2c_board_info *info)
06160327	340	{
797eaa4b	341	struct i2c_adapter *adapter = new_client->adapter;
52df6440	342	const char *name;
8c1d0419	343	int mfg_id, chip_id;
06160327 DR	344
06160327 DR	345	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
797eaa4b	346	return -ENODEV;
06160327	347
8c1d0419 GR	348	mfg_id = i2c_smbus_read_byte_data(new_client, LM95241_REG_R_MAN_ID);
	349	if (mfg_id != NATSEMI_MAN_ID)
	350	return -ENODEV;
	351
	352	chip_id = i2c_smbus_read_byte_data(new_client, LM95241_REG_R_CHIP_ID);
	353	switch (chip_id) {
	354	case LM95231_CHIP_ID:
	355	name = "lm95231";
	356	break;
	357	case LM95241_CHIP_ID:
	358	name = "lm95241";
	359	break;
	360	default:
52df6440	361	return -ENODEV;
06160327 DR	362	}
06160327 DR	363
797eaa4b	364	/* Fill the i2c board info */
797eaa4b JD	365	strlcpy(info->type, name, I2C_NAME_SIZE);
	366	return 0;
	367	}
06160327	368
0f1deb4b DR	369	static void lm95241_init_client(struct i2c_client *client)
	370	{
	371	struct lm95241_data *data = i2c_get_clientdata(client);
	372
	373	data->interval = HZ; /* 1 sec default */
	374	data->valid = 0;
	375	data->config = CFG_CR0076;
	376	data->model = 0;
	377	data->trutherm = (TT_OFF << TT1_SHIFT) \| (TT_OFF << TT2_SHIFT);
	378
	379	i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config);
	380	i2c_smbus_write_byte_data(client, LM95241_REG_RW_REM_FILTER,
	381	R1FE_MASK \| R2FE_MASK);
	382	i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM,
	383	data->trutherm);
	384	i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL,
	385	data->model);
	386	}
	387
797eaa4b JD	388	static int lm95241_probe(struct i2c_client *new_client,
	389	const struct i2c_device_id *id)
	390	{
	391	struct lm95241_data *data;
	392	int err;
06160327	393
1487bf70 GR	394	data = devm_kzalloc(&new_client->dev, sizeof(struct lm95241_data),
	395	GFP_KERNEL);
	396	if (!data)
	397	return -ENOMEM;
797eaa4b JD	398
	399	i2c_set_clientdata(new_client, data);
	400	mutex_init(&data->update_lock);
06160327 DR	401
	402	/* Initialize the LM95241 chip */
	403	lm95241_init_client(new_client);
	404
	405	/* Register sysfs hooks */
	406	err = sysfs_create_group(&new_client->dev.kobj, &lm95241_group);
	407	if (err)
1487bf70	408	return err;
06160327 DR	409
	410	data->hwmon_dev = hwmon_device_register(&new_client->dev);
	411	if (IS_ERR(data->hwmon_dev)) {
	412	err = PTR_ERR(data->hwmon_dev);
	413	goto exit_remove_files;
	414	}
	415
	416	return 0;
	417
	418	exit_remove_files:
	419	sysfs_remove_group(&new_client->dev.kobj, &lm95241_group);
06160327 DR	420	return err;
	421	}
	422
797eaa4b	423	static int lm95241_remove(struct i2c_client *client)
06160327 DR	424	{
06160327 DR	425	struct lm95241_data *data = i2c_get_clientdata(client);
06160327 DR	426
	427	hwmon_device_unregister(data->hwmon_dev);
	428	sysfs_remove_group(&client->dev.kobj, &lm95241_group);
	429
06160327 DR	430	return 0;
	431	}
	432
797eaa4b JD	433	/* Driver data (common to all clients) */
797eaa4b JD	434	static const struct i2c_device_id lm95241_id[] = {
8c1d0419 GR	435	{ "lm95231", 0 },
8c1d0419 GR	436	{ "lm95241", 0 },
797eaa4b JD	437	{ }
	438	};
	439	MODULE_DEVICE_TABLE(i2c, lm95241_id);
	440
	441	static struct i2c_driver lm95241_driver = {
	442	.class = I2C_CLASS_HWMON,
	443	.driver = {
0f1deb4b	444	.name = DEVNAME,
797eaa4b JD	445	},
	446	.probe = lm95241_probe,
	447	.remove = lm95241_remove,
	448	.id_table = lm95241_id,
	449	.detect = lm95241_detect,
c3813d6a	450	.address_list = normal_i2c,
797eaa4b JD	451	};
797eaa4b JD	452
f0967eea	453	module_i2c_driver(lm95241_driver);
06160327	454
0f1deb4b	455	MODULE_AUTHOR("Davide Rizzo <[email protected]>");
06160327 DR	456	MODULE_DESCRIPTION("LM95241 sensor driver");
06160327 DR	457	MODULE_LICENSE("GPL");