[linux-2.6-block.git] / drivers / hwmon / lm95245.c

/*
 * Copyright (C) 2011 Alexander Stein <alexander.stein@systec-electronic.com>
 *
 * The LM95245 is a sensor chip made by TI / National Semiconductor.
 * It reports up to two temperatures (its own plus an external one).
 *
 * This driver is based on lm95241.c
 *
 * 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>

static const unsigned short normal_i2c[] = {
	0x18, 0x19, 0x29, 0x4c, 0x4d, I2C_CLIENT_END };

/* LM95245 registers */
/* general registers */
#define LM95245_REG_RW_CONFIG1		0x03
#define LM95245_REG_RW_CONVERS_RATE	0x04
#define LM95245_REG_W_ONE_SHOT		0x0F

/* diode configuration */
#define LM95245_REG_RW_CONFIG2		0xBF
#define LM95245_REG_RW_REMOTE_OFFH	0x11
#define LM95245_REG_RW_REMOTE_OFFL	0x12

/* status registers */
#define LM95245_REG_R_STATUS1		0x02
#define LM95245_REG_R_STATUS2		0x33

/* limit registers */
#define LM95245_REG_RW_REMOTE_OS_LIMIT		0x07
#define LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT	0x20
#define LM95245_REG_RW_REMOTE_TCRIT_LIMIT	0x19
#define LM95245_REG_RW_COMMON_HYSTERESIS	0x21

/* temperature signed */
#define LM95245_REG_R_LOCAL_TEMPH_S	0x00
#define LM95245_REG_R_LOCAL_TEMPL_S	0x30
#define LM95245_REG_R_REMOTE_TEMPH_S	0x01
#define LM95245_REG_R_REMOTE_TEMPL_S	0x10
/* temperature unsigned */
#define LM95245_REG_R_REMOTE_TEMPH_U	0x31
#define LM95245_REG_R_REMOTE_TEMPL_U	0x32

/* id registers */
#define LM95245_REG_R_MAN_ID		0xFE
#define LM95245_REG_R_CHIP_ID		0xFF

/* LM95245 specific bitfields */
#define CFG_STOP		0x40
#define CFG_REMOTE_TCRIT_MASK	0x10
#define CFG_REMOTE_OS_MASK	0x08
#define CFG_LOCAL_TCRIT_MASK	0x04
#define CFG_LOCAL_OS_MASK	0x02

#define CFG2_OS_A0		0x40
#define CFG2_DIODE_FAULT_OS	0x20
#define CFG2_DIODE_FAULT_TCRIT	0x10
#define CFG2_REMOTE_TT		0x08
#define CFG2_REMOTE_FILTER_DIS	0x00
#define CFG2_REMOTE_FILTER_EN	0x06

/* conversation rate in ms */
#define RATE_CR0063	0x00
#define RATE_CR0364	0x01
#define RATE_CR1000	0x02
#define RATE_CR2500	0x03

#define STATUS1_DIODE_FAULT	0x04
#define STATUS1_RTCRIT		0x02
#define STATUS1_LOC		0x01

#define MANUFACTURER_ID		0x01
#define LM95235_REVISION	0xB1
#define LM95245_REVISION	0xB3

static const u8 lm95245_reg_address[] = {
	LM95245_REG_R_LOCAL_TEMPH_S,
	LM95245_REG_R_LOCAL_TEMPL_S,
	LM95245_REG_R_REMOTE_TEMPH_S,
	LM95245_REG_R_REMOTE_TEMPL_S,
	LM95245_REG_R_REMOTE_TEMPH_U,
	LM95245_REG_R_REMOTE_TEMPL_U,
	LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT,
	LM95245_REG_RW_REMOTE_TCRIT_LIMIT,
	LM95245_REG_RW_COMMON_HYSTERESIS,
	LM95245_REG_R_STATUS1,
};

/* Client data (each client gets its own) */
struct lm95245_data {
	struct i2c_client *client;
	struct mutex update_lock;
	unsigned long last_updated;	/* in jiffies */
	unsigned long interval;	/* in msecs */
	bool valid;		/* zero until following fields are valid */
	/* registers values */
	u8 regs[ARRAY_SIZE(lm95245_reg_address)];
	u8 config1, config2;
};

/* Conversions */
static int temp_from_reg_unsigned(u8 val_h, u8 val_l)
{
	return val_h * 1000 + val_l * 1000 / 256;
}

static int temp_from_reg_signed(u8 val_h, u8 val_l)
{
	if (val_h & 0x80)
		return (val_h - 0x100) * 1000;
	return temp_from_reg_unsigned(val_h, val_l);
}

static struct lm95245_data *lm95245_update_device(struct device *dev)
{
	struct lm95245_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;

		for (i = 0; i < ARRAY_SIZE(lm95245_reg_address); i++)
			data->regs[i]
			  = i2c_smbus_read_byte_data(client,
						     lm95245_reg_address[i]);
		data->last_updated = jiffies;
		data->valid = 1;
	}

	mutex_unlock(&data->update_lock);

	return data;
}

static unsigned long lm95245_read_conversion_rate(struct i2c_client *client)
{
	int rate;
	unsigned long interval;

	rate = i2c_smbus_read_byte_data(client, LM95245_REG_RW_CONVERS_RATE);

	switch (rate) {
	case RATE_CR0063:
		interval = 63;
		break;
	case RATE_CR0364:
		interval = 364;
		break;
	case RATE_CR1000:
		interval = 1000;
		break;
	case RATE_CR2500:
	default:
		interval = 2500;
		break;
	}

	return interval;
}

static unsigned long lm95245_set_conversion_rate(struct i2c_client *client,
			unsigned long interval)
{
	int rate;

	if (interval <= 63) {
		interval = 63;
		rate = RATE_CR0063;
	} else if (interval <= 364) {
		interval = 364;
		rate = RATE_CR0364;
	} else if (interval <= 1000) {
		interval = 1000;
		rate = RATE_CR1000;
	} else {
		interval = 2500;
		rate = RATE_CR2500;
	}

	i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONVERS_RATE, rate);

	return interval;
}

/* Sysfs stuff */
static ssize_t show_input(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	struct lm95245_data *data = lm95245_update_device(dev);
	int temp;
	int index = to_sensor_dev_attr(attr)->index;

	/*
	 * Index 0 (Local temp) is always signed
	 * Index 2 (Remote temp) has both signed and unsigned data
	 * use signed calculation for remote if signed bit is set
	 */
	if (index == 0 || data->regs[index] & 0x80)
		temp = temp_from_reg_signed(data->regs[index],
			    data->regs[index + 1]);
	else
		temp = temp_from_reg_unsigned(data->regs[index + 2],
			    data->regs[index + 3]);

	return snprintf(buf, PAGE_SIZE - 1, "%d\n", temp);
}

static ssize_t show_limit(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct lm95245_data *data = lm95245_update_device(dev);
	int index = to_sensor_dev_attr(attr)->index;

	return snprintf(buf, PAGE_SIZE - 1, "%d\n",
			data->regs[index] * 1000);
}

static ssize_t set_limit(struct device *dev, struct device_attribute *attr,
			const char *buf, size_t count)
{
	struct lm95245_data *data = dev_get_drvdata(dev);
	int index = to_sensor_dev_attr(attr)->index;
	struct i2c_client *client = data->client;
	unsigned long val;

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

	val /= 1000;

	val = clamp_val(val, 0, (index == 6 ? 127 : 255));

	mutex_lock(&data->update_lock);

	data->valid = 0;

	i2c_smbus_write_byte_data(client, lm95245_reg_address[index], val);

	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t show_crit_hyst(struct device *dev, struct device_attribute *attr,
			char *buf)
{
	struct lm95245_data *data = lm95245_update_device(dev);
	int index = to_sensor_dev_attr(attr)->index;
	int hyst = data->regs[index] - data->regs[8];

	return snprintf(buf, PAGE_SIZE - 1, "%d\n", hyst * 1000);
}

static ssize_t set_crit_hyst(struct device *dev, struct device_attribute *attr,
			const char *buf, size_t count)
{
	struct lm95245_data *data = dev_get_drvdata(dev);
	int index = to_sensor_dev_attr(attr)->index;
	struct i2c_client *client = data->client;
	unsigned long val;
	int hyst, limit;

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

	mutex_lock(&data->update_lock);

	limit = i2c_smbus_read_byte_data(client, lm95245_reg_address[index]);
	hyst = limit - val / 1000;
	hyst = clamp_val(hyst, 0, 31);
	data->regs[8] = hyst;

	/* shared crit hysteresis */
	i2c_smbus_write_byte_data(client, LM95245_REG_RW_COMMON_HYSTERESIS,
		hyst);

	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t show_type(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct lm95245_data *data = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE - 1,
		data->config2 & CFG2_REMOTE_TT ? "1\n" : "2\n");
}

static ssize_t set_type(struct device *dev, struct device_attribute *attr,
			const char *buf, size_t count)
{
	struct lm95245_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	unsigned long val;

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

	mutex_lock(&data->update_lock);

	if (val == 1)
		data->config2 |= CFG2_REMOTE_TT;
	else
		data->config2 &= ~CFG2_REMOTE_TT;

	data->valid = 0;

	i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONFIG2,
				  data->config2);

	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct lm95245_data *data = lm95245_update_device(dev);
	int index = to_sensor_dev_attr(attr)->index;

	return snprintf(buf, PAGE_SIZE - 1, "%d\n",
			!!(data->regs[9] & index));
}

static ssize_t show_interval(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	struct lm95245_data *data = lm95245_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 lm95245_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	unsigned long val;

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

	mutex_lock(&data->update_lock);

	data->interval = lm95245_set_conversion_rate(client, val);

	mutex_unlock(&data->update_lock);

	return count;
}

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_limit,
		set_limit, 6);
static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_crit_hyst,
		set_crit_hyst, 6);
static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL,
		STATUS1_LOC);

static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_input, NULL, 2);
static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_limit,
		set_limit, 7);
static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_crit_hyst, NULL, 7);
static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL,
		STATUS1_RTCRIT);
static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type,
		set_type, 0);
static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL,
		STATUS1_DIODE_FAULT);

static DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, show_interval,
		set_interval);

static struct attribute *lm95245_attrs[] = {
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp2_crit.dev_attr.attr,
	&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_type.dev_attr.attr,
	&sensor_dev_attr_temp2_fault.dev_attr.attr,
	&dev_attr_update_interval.attr,
	NULL
};
ATTRIBUTE_GROUPS(lm95245);

/* Return 0 if detection is successful, -ENODEV otherwise */
static int lm95245_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;
	int rev, id;

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

	id = i2c_smbus_read_byte_data(new_client, LM95245_REG_R_MAN_ID);
	if (id != MANUFACTURER_ID)
		return -ENODEV;

	rev = i2c_smbus_read_byte_data(new_client, LM95245_REG_R_CHIP_ID);
	switch (rev) {
	case LM95235_REVISION:
		if (address != 0x18 && address != 0x29 && address != 0x4c)
			return -ENODEV;
		name = "lm95235";
		break;
	case LM95245_REVISION:
		name = "lm95245";
		break;
	default:
		return -ENODEV;
	}

	strlcpy(info->type, name, I2C_NAME_SIZE);
	return 0;
}

static void lm95245_init_client(struct i2c_client *client,
				struct lm95245_data *data)
{
	data->interval = lm95245_read_conversion_rate(client);

	data->config1 = i2c_smbus_read_byte_data(client,
		LM95245_REG_RW_CONFIG1);
	data->config2 = i2c_smbus_read_byte_data(client,
		LM95245_REG_RW_CONFIG2);

	if (data->config1 & CFG_STOP) {
		/* Clear the standby bit */
		data->config1 &= ~CFG_STOP;
		i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONFIG1,
			data->config1);
	}
}

static int lm95245_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	struct lm95245_data *data;
	struct device *hwmon_dev;

	data = devm_kzalloc(dev, sizeof(struct lm95245_data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

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

	/* Initialize the LM95245 chip */
	lm95245_init_client(client, data);

	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
							   data,
							   lm95245_groups);
	return PTR_ERR_OR_ZERO(hwmon_dev);
}

/* Driver data (common to all clients) */
static const struct i2c_device_id lm95245_id[] = {
	{ "lm95235", 0 },
	{ "lm95245", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, lm95245_id);

static struct i2c_driver lm95245_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "lm95245",
	},
	.probe		= lm95245_probe,
	.id_table	= lm95245_id,
	.detect		= lm95245_detect,
	.address_list	= normal_i2c,
};

module_i2c_driver(lm95245_driver);

MODULE_AUTHOR("Alexander Stein <alexander.stein@systec-electronic.com>");
MODULE_DESCRIPTION("LM95235/LM95245 sensor driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
fffd80cc AS	1	/*
	2	* Copyright (C) 2011 Alexander Stein <alexander.stein@systec-electronic.com>
	3	*
162a8dfe	4	* The LM95245 is a sensor chip made by TI / National Semiconductor.
fffd80cc	5	* It reports up to two temperatures (its own plus an external one).
fffd80cc AS	6	*
	7	* This driver is based on lm95241.c
	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
fffd80cc AS	35	static const unsigned short normal_i2c[] = {
	36	0x18, 0x19, 0x29, 0x4c, 0x4d, I2C_CLIENT_END };
	37
	38	/* LM95245 registers */
	39	/* general registers */
	40	#define LM95245_REG_RW_CONFIG1 0x03
	41	#define LM95245_REG_RW_CONVERS_RATE 0x04
	42	#define LM95245_REG_W_ONE_SHOT 0x0F
	43
	44	/* diode configuration */
	45	#define LM95245_REG_RW_CONFIG2 0xBF
	46	#define LM95245_REG_RW_REMOTE_OFFH 0x11
	47	#define LM95245_REG_RW_REMOTE_OFFL 0x12
	48
	49	/* status registers */
	50	#define LM95245_REG_R_STATUS1 0x02
	51	#define LM95245_REG_R_STATUS2 0x33
	52
	53	/* limit registers */
	54	#define LM95245_REG_RW_REMOTE_OS_LIMIT 0x07
	55	#define LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT 0x20
	56	#define LM95245_REG_RW_REMOTE_TCRIT_LIMIT 0x19
	57	#define LM95245_REG_RW_COMMON_HYSTERESIS 0x21
	58
	59	/* temperature signed */
	60	#define LM95245_REG_R_LOCAL_TEMPH_S 0x00
	61	#define LM95245_REG_R_LOCAL_TEMPL_S 0x30
	62	#define LM95245_REG_R_REMOTE_TEMPH_S 0x01
	63	#define LM95245_REG_R_REMOTE_TEMPL_S 0x10
	64	/* temperature unsigned */
	65	#define LM95245_REG_R_REMOTE_TEMPH_U 0x31
	66	#define LM95245_REG_R_REMOTE_TEMPL_U 0x32
	67
	68	/* id registers */
	69	#define LM95245_REG_R_MAN_ID 0xFE
	70	#define LM95245_REG_R_CHIP_ID 0xFF
	71
	72	/* LM95245 specific bitfields */
	73	#define CFG_STOP 0x40
	74	#define CFG_REMOTE_TCRIT_MASK 0x10
	75	#define CFG_REMOTE_OS_MASK 0x08
	76	#define CFG_LOCAL_TCRIT_MASK 0x04
	77	#define CFG_LOCAL_OS_MASK 0x02
	78
	79	#define CFG2_OS_A0 0x40
	80	#define CFG2_DIODE_FAULT_OS 0x20
	81	#define CFG2_DIODE_FAULT_TCRIT 0x10
	82	#define CFG2_REMOTE_TT 0x08
	83	#define CFG2_REMOTE_FILTER_DIS 0x00
	84	#define CFG2_REMOTE_FILTER_EN 0x06
	85
	86	/* conversation rate in ms */
	87	#define RATE_CR0063 0x00
	88	#define RATE_CR0364 0x01
	89	#define RATE_CR1000 0x02
	90	#define RATE_CR2500 0x03
	91
	92	#define STATUS1_DIODE_FAULT 0x04
	93	#define STATUS1_RTCRIT 0x02
	94	#define STATUS1_LOC 0x01
	95
	96	#define MANUFACTURER_ID 0x01
162a8dfe GR	97	#define LM95235_REVISION 0xB1
162a8dfe GR	98	#define LM95245_REVISION 0xB3
fffd80cc AS	99
	100	static const u8 lm95245_reg_address[] = {
	101	LM95245_REG_R_LOCAL_TEMPH_S,
	102	LM95245_REG_R_LOCAL_TEMPL_S,
	103	LM95245_REG_R_REMOTE_TEMPH_S,
	104	LM95245_REG_R_REMOTE_TEMPL_S,
	105	LM95245_REG_R_REMOTE_TEMPH_U,
	106	LM95245_REG_R_REMOTE_TEMPL_U,
	107	LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT,
	108	LM95245_REG_RW_REMOTE_TCRIT_LIMIT,
	109	LM95245_REG_RW_COMMON_HYSTERESIS,
	110	LM95245_REG_R_STATUS1,
	111	};
	112
	113	/* Client data (each client gets its own) */
	114	struct lm95245_data {
7276d55e	115	struct i2c_client *client;
fffd80cc AS	116	struct mutex update_lock;
	117	unsigned long last_updated; /* in jiffies */
	118	unsigned long interval; /* in msecs */
	119	bool valid; /* zero until following fields are valid */
	120	/* registers values */
	121	u8 regs[ARRAY_SIZE(lm95245_reg_address)];
	122	u8 config1, config2;
	123	};
	124
	125	/* Conversions */
	126	static int temp_from_reg_unsigned(u8 val_h, u8 val_l)
	127	{
	128	return val_h * 1000 + val_l * 1000 / 256;
	129	}
	130
	131	static int temp_from_reg_signed(u8 val_h, u8 val_l)
	132	{
	133	if (val_h & 0x80)
	134	return (val_h - 0x100) * 1000;
	135	return temp_from_reg_unsigned(val_h, val_l);
	136	}
	137
	138	static struct lm95245_data lm95245_update_device(struct device dev)
	139	{
7276d55e GR	140	struct lm95245_data *data = dev_get_drvdata(dev);
7276d55e GR	141	struct i2c_client *client = data->client;
fffd80cc AS	142
	143	mutex_lock(&data->update_lock);
	144
	145	if (time_after(jiffies, data->last_updated
	146	+ msecs_to_jiffies(data->interval)) \|\| !data->valid) {
	147	int i;
	148
fffd80cc AS	149	for (i = 0; i < ARRAY_SIZE(lm95245_reg_address); i++)
	150	data->regs[i]
	151	= i2c_smbus_read_byte_data(client,
	152	lm95245_reg_address[i]);
	153	data->last_updated = jiffies;
	154	data->valid = 1;
	155	}
	156
	157	mutex_unlock(&data->update_lock);
	158
	159	return data;
	160	}
	161
	162	static unsigned long lm95245_read_conversion_rate(struct i2c_client *client)
	163	{
	164	int rate;
	165	unsigned long interval;
	166
	167	rate = i2c_smbus_read_byte_data(client, LM95245_REG_RW_CONVERS_RATE);
	168
	169	switch (rate) {
	170	case RATE_CR0063:
	171	interval = 63;
	172	break;
	173	case RATE_CR0364:
	174	interval = 364;
	175	break;
	176	case RATE_CR1000:
	177	interval = 1000;
	178	break;
	179	case RATE_CR2500:
	180	default:
	181	interval = 2500;
	182	break;
	183	}
	184
	185	return interval;
	186	}
	187
	188	static unsigned long lm95245_set_conversion_rate(struct i2c_client *client,
	189	unsigned long interval)
	190	{
	191	int rate;
	192
	193	if (interval <= 63) {
	194	interval = 63;
	195	rate = RATE_CR0063;
	196	} else if (interval <= 364) {
	197	interval = 364;
	198	rate = RATE_CR0364;
	199	} else if (interval <= 1000) {
	200	interval = 1000;
	201	rate = RATE_CR1000;
	202	} else {
	203	interval = 2500;
	204	rate = RATE_CR2500;
	205	}
	206
	207	i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONVERS_RATE, rate);
	208
	209	return interval;
	210	}
	211
	212	/* Sysfs stuff */
213	static ssize_t show_input(struct device dev, struct device_attribute attr,
214	char *buf)
215	{
216	struct lm95245_data *data = lm95245_update_device(dev);
217	int temp;
218	int index = to_sensor_dev_attr(attr)->index;
219
220	/*
221	* Index 0 (Local temp) is always signed
222	* Index 2 (Remote temp) has both signed and unsigned data
223	* use signed calculation for remote if signed bit is set
224	*/
225	if (index == 0 \|\| data->regs[index] & 0x80)
226	temp = temp_from_reg_signed(data->regs[index],
227	data->regs[index + 1]);
228	else
229	temp = temp_from_reg_unsigned(data->regs[index + 2],
230	data->regs[index + 3]);
231
232	return snprintf(buf, PAGE_SIZE - 1, "%d\n", temp);
233	}
234
235	static ssize_t show_limit(struct device dev, struct device_attribute attr,
236	char *buf)
237	{
238	struct lm95245_data *data = lm95245_update_device(dev);
239	int index = to_sensor_dev_attr(attr)->index;
240
241	return snprintf(buf, PAGE_SIZE - 1, "%d\n",
242	data->regs[index] * 1000);
243	}
244
245	static ssize_t set_limit(struct device dev, struct device_attribute attr,
246	const char *buf, size_t count)
247	{
7276d55e	248	struct lm95245_data *data = dev_get_drvdata(dev);
fffd80cc	249	int index = to_sensor_dev_attr(attr)->index;
7276d55e	250	struct i2c_client *client = data->client;
fffd80cc AS	251	unsigned long val;
fffd80cc AS	252
179c4fdb	253	if (kstrtoul(buf, 10, &val) < 0)
fffd80cc AS	254	return -EINVAL;
	255
	256	val /= 1000;
	257
2a844c14	258	val = clamp_val(val, 0, (index == 6 ? 127 : 255));
fffd80cc AS	259
	260	mutex_lock(&data->update_lock);
	261
	262	data->valid = 0;
	263
	264	i2c_smbus_write_byte_data(client, lm95245_reg_address[index], val);
	265
	266	mutex_unlock(&data->update_lock);
	267
	268	return count;
	269	}
	270
408c15ea GR	271	static ssize_t show_crit_hyst(struct device dev, struct device_attribute attr,
	272	char *buf)
	273	{
	274	struct lm95245_data *data = lm95245_update_device(dev);
	275	int index = to_sensor_dev_attr(attr)->index;
	276	int hyst = data->regs[index] - data->regs[8];
	277
	278	return snprintf(buf, PAGE_SIZE - 1, "%d\n", hyst * 1000);
	279	}
	280
fffd80cc AS	281	static ssize_t set_crit_hyst(struct device dev, struct device_attribute attr,
	282	const char *buf, size_t count)
	283	{
7276d55e	284	struct lm95245_data *data = dev_get_drvdata(dev);
408c15ea	285	int index = to_sensor_dev_attr(attr)->index;
7276d55e	286	struct i2c_client *client = data->client;
fffd80cc	287	unsigned long val;
408c15ea	288	int hyst, limit;
fffd80cc	289
179c4fdb	290	if (kstrtoul(buf, 10, &val) < 0)
fffd80cc AS	291	return -EINVAL;
fffd80cc AS	292
fffd80cc AS	293	mutex_lock(&data->update_lock);
fffd80cc AS	294
408c15ea GR	295	limit = i2c_smbus_read_byte_data(client, lm95245_reg_address[index]);
	296	hyst = limit - val / 1000;
	297	hyst = clamp_val(hyst, 0, 31);
	298	data->regs[8] = hyst;
fffd80cc AS	299
	300	/* shared crit hysteresis */
	301	i2c_smbus_write_byte_data(client, LM95245_REG_RW_COMMON_HYSTERESIS,
408c15ea	302	hyst);
fffd80cc AS	303
	304	mutex_unlock(&data->update_lock);
	305
	306	return count;
	307	}
	308
	309	static ssize_t show_type(struct device dev, struct device_attribute attr,
	310	char *buf)
	311	{
7276d55e	312	struct lm95245_data *data = dev_get_drvdata(dev);
fffd80cc AS	313
	314	return snprintf(buf, PAGE_SIZE - 1,
	315	data->config2 & CFG2_REMOTE_TT ? "1\n" : "2\n");
	316	}
	317
	318	static ssize_t set_type(struct device dev, struct device_attribute attr,
	319	const char *buf, size_t count)
	320	{
7276d55e GR	321	struct lm95245_data *data = dev_get_drvdata(dev);
7276d55e GR	322	struct i2c_client *client = data->client;
fffd80cc AS	323	unsigned long val;
fffd80cc AS	324
179c4fdb	325	if (kstrtoul(buf, 10, &val) < 0)
fffd80cc AS	326	return -EINVAL;
	327	if (val != 1 && val != 2)
	328	return -EINVAL;
	329
	330	mutex_lock(&data->update_lock);
	331
	332	if (val == 1)
	333	data->config2 \|= CFG2_REMOTE_TT;
	334	else
	335	data->config2 &= ~CFG2_REMOTE_TT;
	336
	337	data->valid = 0;
	338
	339	i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONFIG2,
	340	data->config2);
	341
	342	mutex_unlock(&data->update_lock);
	343
	344	return count;
	345	}
	346
	347	static ssize_t show_alarm(struct device dev, struct device_attribute attr,
	348	char *buf)
	349	{
	350	struct lm95245_data *data = lm95245_update_device(dev);
	351	int index = to_sensor_dev_attr(attr)->index;
	352
	353	return snprintf(buf, PAGE_SIZE - 1, "%d\n",
	354	!!(data->regs[9] & index));
	355	}
	356
	357	static ssize_t show_interval(struct device dev, struct device_attribute attr,
	358	char *buf)
	359	{
	360	struct lm95245_data *data = lm95245_update_device(dev);
	361
	362	return snprintf(buf, PAGE_SIZE - 1, "%lu\n", data->interval);
	363	}
	364
	365	static ssize_t set_interval(struct device dev, struct device_attribute attr,
	366	const char *buf, size_t count)
	367	{
7276d55e GR	368	struct lm95245_data *data = dev_get_drvdata(dev);
7276d55e GR	369	struct i2c_client *client = data->client;
fffd80cc AS	370	unsigned long val;
fffd80cc AS	371
179c4fdb	372	if (kstrtoul(buf, 10, &val) < 0)
fffd80cc AS	373	return -EINVAL;
	374
	375	mutex_lock(&data->update_lock);
	376
	377	data->interval = lm95245_set_conversion_rate(client, val);
	378
	379	mutex_unlock(&data->update_lock);
	380
	381	return count;
	382	}
	383
	384	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 0);
	385	static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR \| S_IRUGO, show_limit,
	386	set_limit, 6);
408c15ea GR	387	static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR \| S_IRUGO, show_crit_hyst,
408c15ea GR	388	set_crit_hyst, 6);
fffd80cc AS	389	static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL,
	390	STATUS1_LOC);
	391
	392	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_input, NULL, 2);
	393	static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR \| S_IRUGO, show_limit,
	394	set_limit, 7);
a41a8927	395	static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_crit_hyst, NULL, 7);
fffd80cc AS	396	static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL,
	397	STATUS1_RTCRIT);
	398	static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR \| S_IRUGO, show_type,
	399	set_type, 0);
	400	static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL,
	401	STATUS1_DIODE_FAULT);
	402
	403	static DEVICE_ATTR(update_interval, S_IWUSR \| S_IRUGO, show_interval,
	404	set_interval);
	405
7276d55e	406	static struct attribute *lm95245_attrs[] = {
fffd80cc AS	407	&sensor_dev_attr_temp1_input.dev_attr.attr,
	408	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	409	&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
	410	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	411	&sensor_dev_attr_temp2_input.dev_attr.attr,
	412	&sensor_dev_attr_temp2_crit.dev_attr.attr,
	413	&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
	414	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	415	&sensor_dev_attr_temp2_type.dev_attr.attr,
	416	&sensor_dev_attr_temp2_fault.dev_attr.attr,
	417	&dev_attr_update_interval.attr,
	418	NULL
	419	};
7276d55e	420	ATTRIBUTE_GROUPS(lm95245);
fffd80cc AS	421
	422	/* Return 0 if detection is successful, -ENODEV otherwise */
	423	static int lm95245_detect(struct i2c_client *new_client,
	424	struct i2c_board_info *info)
	425	{
	426	struct i2c_adapter *adapter = new_client->adapter;
162a8dfe GR	427	int address = new_client->addr;
	428	const char *name;
	429	int rev, id;
fffd80cc AS	430
	431	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	432	return -ENODEV;
	433
162a8dfe GR	434	id = i2c_smbus_read_byte_data(new_client, LM95245_REG_R_MAN_ID);
162a8dfe GR	435	if (id != MANUFACTURER_ID)
fffd80cc AS	436	return -ENODEV;
fffd80cc AS	437
162a8dfe GR	438	rev = i2c_smbus_read_byte_data(new_client, LM95245_REG_R_CHIP_ID);
	439	switch (rev) {
	440	case LM95235_REVISION:
	441	if (address != 0x18 && address != 0x29 && address != 0x4c)
	442	return -ENODEV;
	443	name = "lm95235";
	444	break;
	445	case LM95245_REVISION:
	446	name = "lm95245";
	447	break;
	448	default:
	449	return -ENODEV;
	450	}
	451
	452	strlcpy(info->type, name, I2C_NAME_SIZE);
fffd80cc AS	453	return 0;
	454	}
	455
7276d55e GR	456	static void lm95245_init_client(struct i2c_client *client,
7276d55e GR	457	struct lm95245_data *data)
fffd80cc	458	{
fffd80cc AS	459	data->interval = lm95245_read_conversion_rate(client);
	460
	461	data->config1 = i2c_smbus_read_byte_data(client,
	462	LM95245_REG_RW_CONFIG1);
	463	data->config2 = i2c_smbus_read_byte_data(client,
	464	LM95245_REG_RW_CONFIG2);
	465
	466	if (data->config1 & CFG_STOP) {
	467	/* Clear the standby bit */
	468	data->config1 &= ~CFG_STOP;
	469	i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONFIG1,
	470	data->config1);
	471	}
	472	}
	473
7276d55e	474	static int lm95245_probe(struct i2c_client *client,
fffd80cc AS	475	const struct i2c_device_id *id)
fffd80cc AS	476	{
7276d55e	477	struct device *dev = &client->dev;
fffd80cc	478	struct lm95245_data *data;
7276d55e	479	struct device *hwmon_dev;
fffd80cc	480
7276d55e	481	data = devm_kzalloc(dev, sizeof(struct lm95245_data), GFP_KERNEL);
a8dd946c GR	482	if (!data)
a8dd946c GR	483	return -ENOMEM;
fffd80cc	484
7276d55e	485	data->client = client;
fffd80cc AS	486	mutex_init(&data->update_lock);
	487
	488	/* Initialize the LM95245 chip */
7276d55e	489	lm95245_init_client(client, data);
fffd80cc	490
7276d55e GR	491	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
	492	data,
	493	lm95245_groups);
	494	return PTR_ERR_OR_ZERO(hwmon_dev);
fffd80cc AS	495	}
	496
	497	/* Driver data (common to all clients) */
	498	static const struct i2c_device_id lm95245_id[] = {
162a8dfe GR	499	{ "lm95235", 0 },
162a8dfe GR	500	{ "lm95245", 0 },
fffd80cc AS	501	{ }
	502	};
	503	MODULE_DEVICE_TABLE(i2c, lm95245_id);
	504
	505	static struct i2c_driver lm95245_driver = {
	506	.class = I2C_CLASS_HWMON,
	507	.driver = {
162a8dfe	508	.name = "lm95245",
fffd80cc AS	509	},
fffd80cc AS	510	.probe = lm95245_probe,
fffd80cc AS	511	.id_table = lm95245_id,
	512	.detect = lm95245_detect,
	513	.address_list = normal_i2c,
	514	};
	515
f0967eea	516	module_i2c_driver(lm95245_driver);
fffd80cc AS	517
fffd80cc AS	518	MODULE_AUTHOR("Alexander Stein <alexander.stein@systec-electronic.com>");
162a8dfe	519	MODULE_DESCRIPTION("LM95235/LM95245 sensor driver");
fffd80cc	520	MODULE_LICENSE("GPL");