[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 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 MANUFACTURER_ID 0x01
#define DEFAULT_REVISION 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 (strict_strtoul(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 (strict_strtol(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 (strict_strtol(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 (strict_strtoul(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;
	int address = new_client->addr;
	const char *name;

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

	if ((i2c_smbus_read_byte_data(new_client, LM95241_REG_R_MAN_ID)
	     == MANUFACTURER_ID)
	    && (i2c_smbus_read_byte_data(new_client, LM95241_REG_R_CHIP_ID)
		== DEFAULT_REVISION)) {
		name = DEVNAME;
	} else {
		dev_dbg(&adapter->dev, "LM95241 detection failed at 0x%02x\n",
			address);
		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 = kzalloc(sizeof(struct lm95241_data), GFP_KERNEL);
	if (!data) {
		err = -ENOMEM;
		goto exit;
	}

	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)
		goto exit_free;

	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);
exit_free:
	kfree(data);
exit:
	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);

	kfree(data);
	return 0;
}

/* Driver data (common to all clients) */
static const struct i2c_device_id lm95241_id[] = {
	{ DEVNAME, 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,
};

static int __init sensors_lm95241_init(void)
{
	return i2c_add_driver(&lm95241_driver);
}

static void __exit sensors_lm95241_exit(void)
{
	i2c_del_driver(&lm95241_driver);
}

MODULE_AUTHOR("Davide Rizzo <elpa.rizzo@gmail.com>");
MODULE_DESCRIPTION("LM95241 sensor driver");
MODULE_LICENSE("GPL");

module_init(sensors_lm95241_init);
module_exit(sensors_lm95241_exit);
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
	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 MANUFACTURER_ID 0x01
	78	#define DEFAULT_REVISION 0xA4
	79
0f1deb4b DR	80	static const u8 lm95241_reg_address[] = {
	81	LM95241_REG_R_LOCAL_TEMPH,
	82	LM95241_REG_R_LOCAL_TEMPL,
	83	LM95241_REG_R_REMOTE1_TEMPH,
	84	LM95241_REG_R_REMOTE1_TEMPL,
	85	LM95241_REG_R_REMOTE2_TEMPH,
	86	LM95241_REG_R_REMOTE2_TEMPL
	87	};
06160327	88
06160327 DR	89	/* Client data (each client gets its own) */
06160327 DR	90	struct lm95241_data {
06160327 DR	91	struct device *hwmon_dev;
06160327 DR	92	struct mutex update_lock;
0f1deb4b DR	93	unsigned long last_updated, interval; /* in jiffies */
0f1deb4b DR	94	char valid; /* zero until following fields are valid */
06160327	95	/* registers values */
0f1deb4b	96	u8 temp[ARRAY_SIZE(lm95241_reg_address)];
06160327 DR	97	u8 config, model, trutherm;
	98	};
	99
0f1deb4b	100	/* Conversions */
0c2a40e2	101	static int temp_from_reg_signed(u8 val_h, u8 val_l)
0f1deb4b	102	{
0c2a40e2 GR	103	s16 val_hl = (val_h << 8) \| val_l;
	104	return val_hl * 1000 / 256;
	105	}
	106
	107	static int temp_from_reg_unsigned(u8 val_h, u8 val_l)
	108	{
	109	u16 val_hl = (val_h << 8) \| val_l;
	110	return val_hl * 1000 / 256;
0f1deb4b DR	111	}
	112
	113	static struct lm95241_data lm95241_update_device(struct device dev)
	114	{
	115	struct i2c_client *client = to_i2c_client(dev);
	116	struct lm95241_data *data = i2c_get_clientdata(client);
	117
	118	mutex_lock(&data->update_lock);
	119
	120	if (time_after(jiffies, data->last_updated + data->interval) \|\|
	121	!data->valid) {
	122	int i;
	123
	124	dev_dbg(&client->dev, "Updating lm95241 data.\n");
	125	for (i = 0; i < ARRAY_SIZE(lm95241_reg_address); i++)
	126	data->temp[i]
	127	= i2c_smbus_read_byte_data(client,
	128	lm95241_reg_address[i]);
	129	data->last_updated = jiffies;
	130	data->valid = 1;
	131	}
	132
	133	mutex_unlock(&data->update_lock);
	134
	135	return data;
	136	}
	137
06160327	138	/* Sysfs stuff */
0f1deb4b DR	139	static ssize_t show_input(struct device dev, struct device_attribute attr,
	140	char *buf)
	141	{
	142	struct lm95241_data *data = lm95241_update_device(dev);
0c2a40e2	143	int index = to_sensor_dev_attr(attr)->index;
0f1deb4b DR	144
0f1deb4b DR	145	return snprintf(buf, PAGE_SIZE - 1, "%d\n",
0c2a40e2 GR	146	index == 0 \|\| (data->config & (1 << (index / 2))) ?
	147	temp_from_reg_signed(data->temp[index], data->temp[index + 1]) :
	148	temp_from_reg_unsigned(data->temp[index],
	149	data->temp[index + 1]));
06160327	150	}
06160327	151
0f1deb4b	152	static ssize_t show_type(struct device dev, struct device_attribute attr,
06160327 DR	153	char *buf)
06160327 DR	154	{
0f1deb4b DR	155	struct i2c_client *client = to_i2c_client(dev);
0f1deb4b DR	156	struct lm95241_data *data = i2c_get_clientdata(client);
06160327	157
0f1deb4b DR	158	return snprintf(buf, PAGE_SIZE - 1,
0f1deb4b DR	159	data->model & to_sensor_dev_attr(attr)->index ? "1\n" : "2\n");
06160327 DR	160	}
06160327 DR	161
0f1deb4b	162	static ssize_t set_type(struct device dev, struct device_attribute attr,
06160327 DR	163	const char *buf, size_t count)
	164	{
	165	struct i2c_client *client = to_i2c_client(dev);
	166	struct lm95241_data *data = i2c_get_clientdata(client);
61ec2da5	167	unsigned long val;
0f1deb4b DR	168	int shift;
0f1deb4b DR	169	u8 mask = to_sensor_dev_attr(attr)->index;
06160327	170
61ec2da5 JD	171	if (strict_strtoul(buf, 10, &val) < 0)
61ec2da5 JD	172	return -EINVAL;
0f1deb4b DR	173	if (val != 1 && val != 2)
0f1deb4b DR	174	return -EINVAL;
61ec2da5	175
0f1deb4b DR	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);
06160327 DR	196
	197	return count;
	198	}
	199
0f1deb4b DR	200	static ssize_t show_min(struct device dev, struct device_attribute attr,
	201	char *buf)
	202	{
	203	struct i2c_client *client = to_i2c_client(dev);
	204	struct lm95241_data *data = i2c_get_clientdata(client);
	205
	206	return snprintf(buf, PAGE_SIZE - 1,
	207	data->config & to_sensor_dev_attr(attr)->index ?
	208	"-127000\n" : "0\n");
06160327	209	}
0f1deb4b DR	210
	211	static ssize_t set_min(struct device dev, struct device_attribute attr,
	212	const char *buf, size_t count)
	213	{
	214	struct i2c_client *client = to_i2c_client(dev);
	215	struct lm95241_data *data = i2c_get_clientdata(client);
	216	long val;
	217
	218	if (strict_strtol(buf, 10, &val) < 0)
	219	return -EINVAL;
	220	if (val < -128000)
	221	return -EINVAL;
	222
	223	mutex_lock(&data->update_lock);
	224
	225	if (val < 0)
	226	data->config \|= to_sensor_dev_attr(attr)->index;
	227	else
	228	data->config &= ~to_sensor_dev_attr(attr)->index;
	229	data->valid = 0;
	230
	231	i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config);
	232
	233	mutex_unlock(&data->update_lock);
	234
	235	return count;
06160327	236	}
0f1deb4b DR	237
	238	static ssize_t show_max(struct device dev, struct device_attribute attr,
	239	char *buf)
	240	{
	241	struct i2c_client *client = to_i2c_client(dev);
	242	struct lm95241_data *data = i2c_get_clientdata(client);
	243
	244	return snprintf(buf, PAGE_SIZE - 1,
	245	data->config & to_sensor_dev_attr(attr)->index ?
	246	"127000\n" : "255000\n");
06160327	247	}
0f1deb4b DR	248
	249	static ssize_t set_max(struct device dev, struct device_attribute attr,
	250	const char *buf, size_t count)
	251	{
	252	struct i2c_client *client = to_i2c_client(dev);
	253	struct lm95241_data *data = i2c_get_clientdata(client);
	254	long val;
	255
	256	if (strict_strtol(buf, 10, &val) < 0)
	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
	269	i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config);
	270
	271	mutex_unlock(&data->update_lock);
	272
	273	return count;
06160327	274	}
0f1deb4b DR	275
	276	static ssize_t show_interval(struct device dev, struct device_attribute attr,
	277	char *buf)
	278	{
	279	struct lm95241_data *data = lm95241_update_device(dev);
	280
	281	return snprintf(buf, PAGE_SIZE - 1, "%lu\n", 1000 * data->interval
	282	/ HZ);
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	{
	288	struct i2c_client *client = to_i2c_client(dev);
	289	struct lm95241_data *data = i2c_get_clientdata(client);
	290	unsigned long val;
	291
	292	if (strict_strtoul(buf, 10, &val) < 0)
	293	return -EINVAL;
	294
	295	data->interval = val * HZ / 1000;
	296
	297	return count;
06160327	298	}
0f1deb4b DR	299
	300	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 0);
	301	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_input, NULL, 2);
	302	static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_input, NULL, 4);
	303	static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR \| S_IRUGO, show_type, set_type,
	304	R1MS_MASK);
	305	static SENSOR_DEVICE_ATTR(temp3_type, S_IWUSR \| S_IRUGO, show_type, set_type,
	306	R2MS_MASK);
	307	static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR \| S_IRUGO, show_min, set_min,
	308	R1DF_MASK);
	309	static SENSOR_DEVICE_ATTR(temp3_min, S_IWUSR \| S_IRUGO, show_min, set_min,
	310	R2DF_MASK);
	311	static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR \| S_IRUGO, show_max, set_max,
	312	R1DF_MASK);
	313	static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR \| S_IRUGO, show_max, set_max,
	314	R2DF_MASK);
bc482bf0 GR	315	static DEVICE_ATTR(update_interval, S_IWUSR \| S_IRUGO, show_interval,
bc482bf0 GR	316	set_interval);
06160327 DR	317
06160327 DR	318	static struct attribute *lm95241_attributes[] = {
0f1deb4b DR	319	&sensor_dev_attr_temp1_input.dev_attr.attr,
	320	&sensor_dev_attr_temp2_input.dev_attr.attr,
	321	&sensor_dev_attr_temp3_input.dev_attr.attr,
	322	&sensor_dev_attr_temp2_type.dev_attr.attr,
	323	&sensor_dev_attr_temp3_type.dev_attr.attr,
	324	&sensor_dev_attr_temp2_min.dev_attr.attr,
	325	&sensor_dev_attr_temp3_min.dev_attr.attr,
	326	&sensor_dev_attr_temp2_max.dev_attr.attr,
	327	&sensor_dev_attr_temp3_max.dev_attr.attr,
bc482bf0	328	&dev_attr_update_interval.attr,
06160327 DR	329	NULL
	330	};
	331
	332	static const struct attribute_group lm95241_group = {
	333	.attrs = lm95241_attributes,
	334	};
	335
797eaa4b	336	/* Return 0 if detection is successful, -ENODEV otherwise */
310ec792	337	static int lm95241_detect(struct i2c_client *new_client,
797eaa4b	338	struct i2c_board_info *info)
06160327	339	{
797eaa4b JD	340	struct i2c_adapter *adapter = new_client->adapter;
797eaa4b JD	341	int address = new_client->addr;
52df6440	342	const char *name;
06160327 DR	343
06160327 DR	344	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
797eaa4b	345	return -ENODEV;
06160327	346
52df6440 JD	347	if ((i2c_smbus_read_byte_data(new_client, LM95241_REG_R_MAN_ID)
52df6440 JD	348	== MANUFACTURER_ID)
0f1deb4b	349	&& (i2c_smbus_read_byte_data(new_client, LM95241_REG_R_CHIP_ID)
27739e69	350	== DEFAULT_REVISION)) {
0f1deb4b	351	name = DEVNAME;
52df6440 JD	352	} else {
	353	dev_dbg(&adapter->dev, "LM95241 detection failed at 0x%02x\n",
	354	address);
	355	return -ENODEV;
06160327 DR	356	}
06160327 DR	357
797eaa4b	358	/* Fill the i2c board info */
797eaa4b JD	359	strlcpy(info->type, name, I2C_NAME_SIZE);
	360	return 0;
	361	}
06160327	362
0f1deb4b DR	363	static void lm95241_init_client(struct i2c_client *client)
	364	{
	365	struct lm95241_data *data = i2c_get_clientdata(client);
	366
	367	data->interval = HZ; /* 1 sec default */
	368	data->valid = 0;
	369	data->config = CFG_CR0076;
	370	data->model = 0;
	371	data->trutherm = (TT_OFF << TT1_SHIFT) \| (TT_OFF << TT2_SHIFT);
	372
	373	i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config);
	374	i2c_smbus_write_byte_data(client, LM95241_REG_RW_REM_FILTER,
	375	R1FE_MASK \| R2FE_MASK);
	376	i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM,
	377	data->trutherm);
	378	i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL,
	379	data->model);
	380	}
	381
797eaa4b JD	382	static int lm95241_probe(struct i2c_client *new_client,
	383	const struct i2c_device_id *id)
	384	{
	385	struct lm95241_data *data;
	386	int err;
06160327	387
797eaa4b JD	388	data = kzalloc(sizeof(struct lm95241_data), GFP_KERNEL);
	389	if (!data) {
	390	err = -ENOMEM;
	391	goto exit;
	392	}
	393
	394	i2c_set_clientdata(new_client, data);
	395	mutex_init(&data->update_lock);
06160327 DR	396
	397	/* Initialize the LM95241 chip */
	398	lm95241_init_client(new_client);
	399
	400	/* Register sysfs hooks */
	401	err = sysfs_create_group(&new_client->dev.kobj, &lm95241_group);
	402	if (err)
797eaa4b	403	goto exit_free;
06160327 DR	404
	405	data->hwmon_dev = hwmon_device_register(&new_client->dev);
	406	if (IS_ERR(data->hwmon_dev)) {
	407	err = PTR_ERR(data->hwmon_dev);
	408	goto exit_remove_files;
	409	}
	410
	411	return 0;
	412
	413	exit_remove_files:
	414	sysfs_remove_group(&new_client->dev.kobj, &lm95241_group);
06160327 DR	415	exit_free:
	416	kfree(data);
	417	exit:
	418	return err;
	419	}
	420
797eaa4b	421	static int lm95241_remove(struct i2c_client *client)
06160327 DR	422	{
06160327 DR	423	struct lm95241_data *data = i2c_get_clientdata(client);
06160327 DR	424
	425	hwmon_device_unregister(data->hwmon_dev);
	426	sysfs_remove_group(&client->dev.kobj, &lm95241_group);
	427
06160327 DR	428	kfree(data);
	429	return 0;
	430	}
	431
797eaa4b JD	432	/* Driver data (common to all clients) */
797eaa4b JD	433	static const struct i2c_device_id lm95241_id[] = {
0f1deb4b	434	{ DEVNAME, 0 },
797eaa4b JD	435	{ }
	436	};
	437	MODULE_DEVICE_TABLE(i2c, lm95241_id);
	438
	439	static struct i2c_driver lm95241_driver = {
	440	.class = I2C_CLASS_HWMON,
	441	.driver = {
0f1deb4b	442	.name = DEVNAME,
797eaa4b JD	443	},
	444	.probe = lm95241_probe,
	445	.remove = lm95241_remove,
	446	.id_table = lm95241_id,
	447	.detect = lm95241_detect,
c3813d6a	448	.address_list = normal_i2c,
797eaa4b JD	449	};
797eaa4b JD	450
06160327 DR	451	static int __init sensors_lm95241_init(void)
	452	{
	453	return i2c_add_driver(&lm95241_driver);
	454	}
	455
	456	static void __exit sensors_lm95241_exit(void)
	457	{
	458	i2c_del_driver(&lm95241_driver);
	459	}
	460
0f1deb4b	461	MODULE_AUTHOR("Davide Rizzo <elpa.rizzo@gmail.com>");
06160327 DR	462	MODULE_DESCRIPTION("LM95241 sensor driver");
	463	MODULE_LICENSE("GPL");
	464
	465	module_init(sensors_lm95241_init);
	466	module_exit(sensors_lm95241_exit);