[mirror_ubuntu-bionic-kernel.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 CFG_CRMASK 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;	/* in jiffies */
	unsigned long interval;		/* in milli-seconds */
	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
		       + msecs_to_jiffies(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", data->interval);
}

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;
	int convrate;
	u8 config;

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

	mutex_lock(&data->update_lock);

	config = data->config & ~CFG_CRMASK;

	if (val < 130) {
		convrate = 76;
		config |= CFG_CR0076;
	} else if (val < 590) {
		convrate = 182;
		config |= CFG_CR0182;
	} else if (val < 1850) {
		convrate = 1000;
		config |= CFG_CR1000;
	} else {
		convrate = 2700;
		config |= CFG_CR2700;
	}

	data->interval = convrate;
	data->config = config;
	i2c_smbus_write_byte_data(data->client, LM95241_REG_RW_CONFIG,
				  config);
	mutex_unlock(&data->update_lock);

	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 = 1000;
	data->config = CFG_CR1000;
	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
06160327	1	/*
0f1deb4b	2	* Copyright (C) 2008, 2010 Davide Rizzo <elpa.rizzo@gmail.com>
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
f48ccb26	62	#define CFG_CRMASK 0x30
06160327 DR	63	#define R1MS_SHIFT 0
	64	#define R2MS_SHIFT 2
	65	#define R1MS_MASK (0x01 << (R1MS_SHIFT))
	66	#define R2MS_MASK (0x01 << (R2MS_SHIFT))
	67	#define R1DF_SHIFT 1
	68	#define R2DF_SHIFT 2
	69	#define R1DF_MASK (0x01 << (R1DF_SHIFT))
	70	#define R2DF_MASK (0x01 << (R2DF_SHIFT))
	71	#define R1FE_MASK 0x01
	72	#define R2FE_MASK 0x05
	73	#define TT1_SHIFT 0
	74	#define TT2_SHIFT 4
	75	#define TT_OFF 0
	76	#define TT_ON 1
	77	#define TT_MASK 7
8c1d0419 GR	78	#define NATSEMI_MAN_ID 0x01
	79	#define LM95231_CHIP_ID 0xA1
	80	#define LM95241_CHIP_ID 0xA4
06160327	81
0f1deb4b DR	82	static const u8 lm95241_reg_address[] = {
	83	LM95241_REG_R_LOCAL_TEMPH,
	84	LM95241_REG_R_LOCAL_TEMPL,
	85	LM95241_REG_R_REMOTE1_TEMPH,
	86	LM95241_REG_R_REMOTE1_TEMPL,
	87	LM95241_REG_R_REMOTE2_TEMPH,
	88	LM95241_REG_R_REMOTE2_TEMPL
	89	};
06160327	90
06160327 DR	91	/* Client data (each client gets its own) */
06160327 DR	92	struct lm95241_data {
f809621e	93	struct i2c_client *client;
06160327	94	struct mutex update_lock;
f48ccb26 GR	95	unsigned long last_updated; /* in jiffies */
f48ccb26 GR	96	unsigned long interval; /* in milli-seconds */
0f1deb4b	97	char valid; /* zero until following fields are valid */
06160327	98	/* registers values */
0f1deb4b	99	u8 temp[ARRAY_SIZE(lm95241_reg_address)];
06160327 DR	100	u8 config, model, trutherm;
	101	};
	102
0f1deb4b	103	/* Conversions */
0c2a40e2	104	static int temp_from_reg_signed(u8 val_h, u8 val_l)
0f1deb4b	105	{
0c2a40e2 GR	106	s16 val_hl = (val_h << 8) \| val_l;
	107	return val_hl * 1000 / 256;
	108	}
	109
	110	static int temp_from_reg_unsigned(u8 val_h, u8 val_l)
	111	{
	112	u16 val_hl = (val_h << 8) \| val_l;
	113	return val_hl * 1000 / 256;
0f1deb4b DR	114	}
	115
	116	static struct lm95241_data lm95241_update_device(struct device dev)
	117	{
f809621e GR	118	struct lm95241_data *data = dev_get_drvdata(dev);
f809621e GR	119	struct i2c_client *client = data->client;
0f1deb4b DR	120
	121	mutex_lock(&data->update_lock);
	122
f48ccb26 GR	123	if (time_after(jiffies, data->last_updated
f48ccb26 GR	124	+ msecs_to_jiffies(data->interval)) \|\|
0f1deb4b DR	125	!data->valid) {
	126	int i;
	127
f809621e	128	dev_dbg(dev, "Updating lm95241 data.\n");
0f1deb4b DR	129	for (i = 0; i < ARRAY_SIZE(lm95241_reg_address); i++)
	130	data->temp[i]
	131	= i2c_smbus_read_byte_data(client,
	132	lm95241_reg_address[i]);
	133	data->last_updated = jiffies;
	134	data->valid = 1;
	135	}
	136
	137	mutex_unlock(&data->update_lock);
	138
	139	return data;
	140	}
	141
06160327	142	/* Sysfs stuff */
0f1deb4b DR	143	static ssize_t show_input(struct device dev, struct device_attribute attr,
	144	char *buf)
	145	{
	146	struct lm95241_data *data = lm95241_update_device(dev);
0c2a40e2	147	int index = to_sensor_dev_attr(attr)->index;
0f1deb4b DR	148
0f1deb4b DR	149	return snprintf(buf, PAGE_SIZE - 1, "%d\n",
0c2a40e2 GR	150	index == 0 \|\| (data->config & (1 << (index / 2))) ?
	151	temp_from_reg_signed(data->temp[index], data->temp[index + 1]) :
	152	temp_from_reg_unsigned(data->temp[index],
	153	data->temp[index + 1]));
06160327	154	}
06160327	155
0f1deb4b	156	static ssize_t show_type(struct device dev, struct device_attribute attr,
06160327 DR	157	char *buf)
06160327 DR	158	{
f809621e	159	struct lm95241_data *data = dev_get_drvdata(dev);
06160327	160
0f1deb4b DR	161	return snprintf(buf, PAGE_SIZE - 1,
0f1deb4b DR	162	data->model & to_sensor_dev_attr(attr)->index ? "1\n" : "2\n");
06160327 DR	163	}
06160327 DR	164
0f1deb4b	165	static ssize_t set_type(struct device dev, struct device_attribute attr,
06160327 DR	166	const char *buf, size_t count)
06160327 DR	167	{
f809621e GR	168	struct lm95241_data *data = dev_get_drvdata(dev);
f809621e GR	169	struct i2c_client *client = data->client;
61ec2da5	170	unsigned long val;
0f1deb4b DR	171	int shift;
0f1deb4b DR	172	u8 mask = to_sensor_dev_attr(attr)->index;
06160327	173
179c4fdb	174	if (kstrtoul(buf, 10, &val) < 0)
61ec2da5	175	return -EINVAL;
0f1deb4b DR	176	if (val != 1 && val != 2)
0f1deb4b DR	177	return -EINVAL;
61ec2da5	178
0f1deb4b DR	179	shift = mask == R1MS_MASK ? TT1_SHIFT : TT2_SHIFT;
	180
	181	mutex_lock(&data->update_lock);
	182
	183	data->trutherm &= ~(TT_MASK << shift);
	184	if (val == 1) {
	185	data->model \|= mask;
	186	data->trutherm \|= (TT_ON << shift);
	187	} else {
	188	data->model &= ~mask;
	189	data->trutherm \|= (TT_OFF << shift);
	190	}
	191	data->valid = 0;
	192
	193	i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL,
	194	data->model);
	195	i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM,
	196	data->trutherm);
	197
	198	mutex_unlock(&data->update_lock);
06160327 DR	199
	200	return count;
	201	}
	202
0f1deb4b DR	203	static ssize_t show_min(struct device dev, struct device_attribute attr,
	204	char *buf)
	205	{
f809621e	206	struct lm95241_data *data = dev_get_drvdata(dev);
0f1deb4b DR	207
	208	return snprintf(buf, PAGE_SIZE - 1,
	209	data->config & to_sensor_dev_attr(attr)->index ?
	210	"-127000\n" : "0\n");
06160327	211	}
0f1deb4b DR	212
	213	static ssize_t set_min(struct device dev, struct device_attribute attr,
	214	const char *buf, size_t count)
	215	{
f809621e	216	struct lm95241_data *data = dev_get_drvdata(dev);
0f1deb4b DR	217	long val;
0f1deb4b DR	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
f809621e GR	232	i2c_smbus_write_byte_data(data->client, LM95241_REG_RW_CONFIG,
f809621e GR	233	data->config);
0f1deb4b DR	234
	235	mutex_unlock(&data->update_lock);
	236
	237	return count;
06160327	238	}
0f1deb4b DR	239
	240	static ssize_t show_max(struct device dev, struct device_attribute attr,
	241	char *buf)
	242	{
f809621e	243	struct lm95241_data *data = dev_get_drvdata(dev);
0f1deb4b DR	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	{
f809621e	253	struct lm95241_data *data = dev_get_drvdata(dev);
0f1deb4b DR	254	long val;
0f1deb4b DR	255
179c4fdb	256	if (kstrtol(buf, 10, &val) < 0)
0f1deb4b DR	257	return -EINVAL;
	258	if (val >= 256000)
	259	return -EINVAL;
	260
	261	mutex_lock(&data->update_lock);
	262
	263	if (val <= 127000)
	264	data->config \|= to_sensor_dev_attr(attr)->index;
	265	else
	266	data->config &= ~to_sensor_dev_attr(attr)->index;
	267	data->valid = 0;
	268
f809621e GR	269	i2c_smbus_write_byte_data(data->client, LM95241_REG_RW_CONFIG,
f809621e GR	270	data->config);
0f1deb4b DR	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
f48ccb26	282	return snprintf(buf, PAGE_SIZE - 1, "%lu\n", data->interval);
06160327	283	}
0f1deb4b DR	284
	285	static ssize_t set_interval(struct device dev, struct device_attribute attr,
	286	const char *buf, size_t count)
	287	{
f809621e	288	struct lm95241_data *data = dev_get_drvdata(dev);
0f1deb4b	289	unsigned long val;
f48ccb26 GR	290	int convrate;
f48ccb26 GR	291	u8 config;
0f1deb4b	292
179c4fdb	293	if (kstrtoul(buf, 10, &val) < 0)
0f1deb4b DR	294	return -EINVAL;
0f1deb4b DR	295
f48ccb26 GR	296	mutex_lock(&data->update_lock);
	297
	298	config = data->config & ~CFG_CRMASK;
	299
	300	if (val < 130) {
	301	convrate = 76;
	302	config \|= CFG_CR0076;
	303	} else if (val < 590) {
	304	convrate = 182;
	305	config \|= CFG_CR0182;
	306	} else if (val < 1850) {
	307	convrate = 1000;
	308	config \|= CFG_CR1000;
	309	} else {
	310	convrate = 2700;
	311	config \|= CFG_CR2700;
	312	}
	313
	314	data->interval = convrate;
	315	data->config = config;
	316	i2c_smbus_write_byte_data(data->client, LM95241_REG_RW_CONFIG,
	317	config);
	318	mutex_unlock(&data->update_lock);
0f1deb4b DR	319
0f1deb4b DR	320	return count;
06160327	321	}
0f1deb4b DR	322
	323	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 0);
	324	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_input, NULL, 2);
	325	static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_input, NULL, 4);
	326	static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR \| S_IRUGO, show_type, set_type,
	327	R1MS_MASK);
	328	static SENSOR_DEVICE_ATTR(temp3_type, S_IWUSR \| S_IRUGO, show_type, set_type,
	329	R2MS_MASK);
	330	static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR \| S_IRUGO, show_min, set_min,
	331	R1DF_MASK);
	332	static SENSOR_DEVICE_ATTR(temp3_min, S_IWUSR \| S_IRUGO, show_min, set_min,
	333	R2DF_MASK);
	334	static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR \| S_IRUGO, show_max, set_max,
	335	R1DF_MASK);
	336	static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR \| S_IRUGO, show_max, set_max,
	337	R2DF_MASK);
bc482bf0 GR	338	static DEVICE_ATTR(update_interval, S_IWUSR \| S_IRUGO, show_interval,
bc482bf0 GR	339	set_interval);
06160327	340
f809621e	341	static struct attribute *lm95241_attrs[] = {
0f1deb4b DR	342	&sensor_dev_attr_temp1_input.dev_attr.attr,
	343	&sensor_dev_attr_temp2_input.dev_attr.attr,
	344	&sensor_dev_attr_temp3_input.dev_attr.attr,
	345	&sensor_dev_attr_temp2_type.dev_attr.attr,
	346	&sensor_dev_attr_temp3_type.dev_attr.attr,
	347	&sensor_dev_attr_temp2_min.dev_attr.attr,
	348	&sensor_dev_attr_temp3_min.dev_attr.attr,
	349	&sensor_dev_attr_temp2_max.dev_attr.attr,
	350	&sensor_dev_attr_temp3_max.dev_attr.attr,
bc482bf0	351	&dev_attr_update_interval.attr,
06160327 DR	352	NULL
06160327 DR	353	};
f809621e	354	ATTRIBUTE_GROUPS(lm95241);
06160327	355
797eaa4b	356	/* Return 0 if detection is successful, -ENODEV otherwise */
310ec792	357	static int lm95241_detect(struct i2c_client *new_client,
797eaa4b	358	struct i2c_board_info *info)
06160327	359	{
797eaa4b	360	struct i2c_adapter *adapter = new_client->adapter;
52df6440	361	const char *name;
8c1d0419	362	int mfg_id, chip_id;
06160327 DR	363
06160327 DR	364	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
797eaa4b	365	return -ENODEV;
06160327	366
8c1d0419 GR	367	mfg_id = i2c_smbus_read_byte_data(new_client, LM95241_REG_R_MAN_ID);
	368	if (mfg_id != NATSEMI_MAN_ID)
	369	return -ENODEV;
	370
	371	chip_id = i2c_smbus_read_byte_data(new_client, LM95241_REG_R_CHIP_ID);
	372	switch (chip_id) {
	373	case LM95231_CHIP_ID:
	374	name = "lm95231";
	375	break;
	376	case LM95241_CHIP_ID:
	377	name = "lm95241";
	378	break;
	379	default:
52df6440	380	return -ENODEV;
06160327 DR	381	}
06160327 DR	382
797eaa4b	383	/* Fill the i2c board info */
797eaa4b JD	384	strlcpy(info->type, name, I2C_NAME_SIZE);
	385	return 0;
	386	}
06160327	387
f809621e GR	388	static void lm95241_init_client(struct i2c_client *client,
f809621e GR	389	struct lm95241_data *data)
0f1deb4b	390	{
f48ccb26 GR	391	data->interval = 1000;
f48ccb26 GR	392	data->config = CFG_CR1000;
0f1deb4b DR	393	data->trutherm = (TT_OFF << TT1_SHIFT) \| (TT_OFF << TT2_SHIFT);
	394
	395	i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config);
	396	i2c_smbus_write_byte_data(client, LM95241_REG_RW_REM_FILTER,
	397	R1FE_MASK \| R2FE_MASK);
	398	i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM,
	399	data->trutherm);
	400	i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL,
	401	data->model);
	402	}
	403
f809621e	404	static int lm95241_probe(struct i2c_client *client,
797eaa4b JD	405	const struct i2c_device_id *id)
797eaa4b JD	406	{
f809621e	407	struct device *dev = &client->dev;
797eaa4b	408	struct lm95241_data *data;
f809621e	409	struct device *hwmon_dev;
06160327	410
f809621e	411	data = devm_kzalloc(dev, sizeof(struct lm95241_data), GFP_KERNEL);
1487bf70 GR	412	if (!data)
1487bf70 GR	413	return -ENOMEM;
797eaa4b	414
f809621e	415	data->client = client;
797eaa4b	416	mutex_init(&data->update_lock);
06160327 DR	417
06160327 DR	418	/* Initialize the LM95241 chip */
f809621e	419	lm95241_init_client(client, data);
06160327	420
f809621e GR	421	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
	422	data,
	423	lm95241_groups);
	424	return PTR_ERR_OR_ZERO(hwmon_dev);
06160327 DR	425	}
06160327 DR	426
797eaa4b JD	427	/* Driver data (common to all clients) */
797eaa4b JD	428	static const struct i2c_device_id lm95241_id[] = {
8c1d0419 GR	429	{ "lm95231", 0 },
8c1d0419 GR	430	{ "lm95241", 0 },
797eaa4b JD	431	{ }
	432	};
	433	MODULE_DEVICE_TABLE(i2c, lm95241_id);
	434
	435	static struct i2c_driver lm95241_driver = {
	436	.class = I2C_CLASS_HWMON,
	437	.driver = {
0f1deb4b	438	.name = DEVNAME,
797eaa4b JD	439	},
797eaa4b JD	440	.probe = lm95241_probe,
797eaa4b JD	441	.id_table = lm95241_id,
797eaa4b JD	442	.detect = lm95241_detect,
c3813d6a	443	.address_list = normal_i2c,
797eaa4b JD	444	};
797eaa4b JD	445
f0967eea	446	module_i2c_driver(lm95241_driver);
06160327	447
0f1deb4b	448	MODULE_AUTHOR("Davide Rizzo <elpa.rizzo@gmail.com>");
06160327 DR	449	MODULE_DESCRIPTION("LM95241 sensor driver");
06160327 DR	450	MODULE_LICENSE("GPL");