drivers/hwmon/f75375s.c

/*
 * f75375s.c - driver for the Fintek F75375/SP and F75373
 *             hardware monitoring features
 * Copyright (C) 2006-2007  Riku Voipio <riku.voipio@movial.fi>
 *
 * Datasheets available at:
 *
 * f75375:
 * http://www.fintek.com.tw/files/productfiles/2005111152950.pdf
 *
 * f75373:
 * http://www.fintek.com.tw/files/productfiles/2005111153128.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/jiffies.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/mutex.h>

/* Addresses to scan */
static unsigned short normal_i2c[] = { 0x2d, 0x2e, I2C_CLIENT_END };

/* Insmod parameters */
I2C_CLIENT_INSMOD_2(f75373, f75375);

/* Fintek F75375 registers  */
#define F75375_REG_CONFIG0		0x0
#define F75375_REG_CONFIG1		0x1
#define F75375_REG_CONFIG2		0x2
#define F75375_REG_CONFIG3		0x3
#define F75375_REG_ADDR			0x4
#define F75375_REG_INTR			0x31
#define F75375_CHIP_ID			0x5A
#define F75375_REG_VERSION		0x5C
#define F75375_REG_VENDOR		0x5D
#define F75375_REG_FAN_TIMER		0x60

#define F75375_REG_VOLT(nr)		(0x10 + (nr))
#define F75375_REG_VOLT_HIGH(nr)	(0x20 + (nr) * 2)
#define F75375_REG_VOLT_LOW(nr)		(0x21 + (nr) * 2)

#define F75375_REG_TEMP(nr)		(0x14 + (nr))
#define F75375_REG_TEMP_HIGH(nr)	(0x28 + (nr) * 2)
#define F75375_REG_TEMP_HYST(nr)	(0x29 + (nr) * 2)

#define F75375_REG_FAN(nr)		(0x16 + (nr) * 2)
#define F75375_REG_FAN_MIN(nr)		(0x2C + (nr) * 2)
#define F75375_REG_FAN_FULL(nr)		(0x70 + (nr) * 0x10)
#define F75375_REG_FAN_PWM_DUTY(nr)	(0x76 + (nr) * 0x10)
#define F75375_REG_FAN_PWM_CLOCK(nr)	(0x7D + (nr) * 0x10)

#define F75375_REG_FAN_EXP(nr)		(0x74 + (nr) * 0x10)
#define F75375_REG_FAN_B_TEMP(nr, step)	((0xA0 + (nr) * 0x10) + (step))
#define F75375_REG_FAN_B_SPEED(nr, step) \
	((0xA5 + (nr) * 0x10) + (step) * 2)

#define F75375_REG_PWM1_RAISE_DUTY	0x69
#define F75375_REG_PWM2_RAISE_DUTY	0x6A
#define F75375_REG_PWM1_DROP_DUTY	0x6B
#define F75375_REG_PWM2_DROP_DUTY	0x6C

#define FAN_CTRL_LINEAR(nr)		(4 + nr)
#define FAN_CTRL_MODE(nr)		(5 + ((nr) * 2))

/*
 * Data structures and manipulation thereof
 */

struct f75375_data {
	unsigned short addr;
	struct i2c_client client;
	struct class_device *class_dev;

	const char *name;
	int kind;
	struct mutex update_lock; /* protect register access */
	char valid;
	unsigned long last_updated;	/* In jiffies */
	unsigned long last_limits;	/* In jiffies */

	/* Register values */
	u8 in[4];
	u8 in_max[4];
	u8 in_min[4];
	u16 fan[2];
	u16 fan_min[2];
	u16 fan_full[2];
	u16 fan_exp[2];
	u8 fan_timer;
	u8 pwm[2];
	u8 pwm_mode[2];
	u8 pwm_enable[2];
	s8 temp[2];
	s8 temp_high[2];
	s8 temp_max_hyst[2];
};

static int f75375_attach_adapter(struct i2c_adapter *adapter);
static int f75375_detect(struct i2c_adapter *adapter, int address, int kind);
static int f75375_detach_client(struct i2c_client *client);

static struct i2c_driver f75375_driver = {
	.driver = {
		.name = "f75375",
	},
	.attach_adapter = f75375_attach_adapter,
	.detach_client = f75375_detach_client,
};

static inline int f75375_read8(struct i2c_client *client, u8 reg)
{
	return i2c_smbus_read_byte_data(client, reg);
}

/* in most cases, should be called while holding update_lock */
static inline u16 f75375_read16(struct i2c_client *client, u8 reg)
{
	return ((i2c_smbus_read_byte_data(client, reg) << 8)
		| i2c_smbus_read_byte_data(client, reg + 1));
}

static inline void f75375_write8(struct i2c_client *client, u8 reg,
		u8 value)
{
	i2c_smbus_write_byte_data(client, reg, value);
}

static inline void f75375_write16(struct i2c_client *client, u8 reg,
		u16 value)
{
	int err = i2c_smbus_write_byte_data(client, reg, (value << 8));
	if (err)
		return;
	i2c_smbus_write_byte_data(client, reg + 1, (value & 0xFF));
}

static struct f75375_data *f75375_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct f75375_data *data = i2c_get_clientdata(client);
	int nr;

	mutex_lock(&data->update_lock);

	/* Limit registers cache is refreshed after 60 seconds */
	if (time_after(jiffies, data->last_limits + 60 * HZ)
		|| !data->valid) {
		for (nr = 0; nr < 2; nr++) {
			data->temp_high[nr] =
				f75375_read8(client, F75375_REG_TEMP_HIGH(nr));
			data->temp_max_hyst[nr] =
				f75375_read8(client, F75375_REG_TEMP_HYST(nr));
			data->fan_full[nr] =
				f75375_read16(client, F75375_REG_FAN_FULL(nr));
			data->fan_min[nr] =
				f75375_read16(client, F75375_REG_FAN_MIN(nr));
			data->fan_exp[nr] =
				f75375_read16(client, F75375_REG_FAN_EXP(nr));
			data->pwm[nr] =	f75375_read8(client,
				F75375_REG_FAN_PWM_DUTY(nr));

		}
		for (nr = 0; nr < 4; nr++) {
			data->in_max[nr] =
				f75375_read8(client, F75375_REG_VOLT_HIGH(nr));
			data->in_min[nr] =
				f75375_read8(client, F75375_REG_VOLT_LOW(nr));
		}
		data->fan_timer = f75375_read8(client, F75375_REG_FAN_TIMER);
		data->last_limits = jiffies;
	}

	/* Measurement registers cache is refreshed after 2 second */
	if (time_after(jiffies, data->last_updated + 2 * HZ)
		|| !data->valid) {
		for (nr = 0; nr < 2; nr++) {
			data->temp[nr] =
				f75375_read8(client, F75375_REG_TEMP(nr));
			data->fan[nr] =
				f75375_read16(client, F75375_REG_FAN(nr));
		}
		for (nr = 0; nr < 4; nr++)
			data->in[nr] =
				f75375_read8(client, F75375_REG_VOLT(nr));

		data->last_updated = jiffies;
		data->valid = 1;
	}

	mutex_unlock(&data->update_lock);
	return data;
}

static inline u16 rpm_from_reg(u16 reg)
{
	if (reg == 0 || reg == 0xffff)
		return 0;
	return (1500000 / reg);
}

static inline u16 rpm_to_reg(int rpm)
{
	if (rpm < 367 || rpm > 0xffff)
		return 0xffff;
	return (1500000 / rpm);
}

static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct i2c_client *client = to_i2c_client(dev);
	struct f75375_data *data = i2c_get_clientdata(client);
	int val = simple_strtoul(buf, NULL, 10);

	mutex_lock(&data->update_lock);
	data->fan_min[nr] = rpm_to_reg(val);
	f75375_write16(client, F75375_REG_FAN_MIN(nr), data->fan_min[nr]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t set_fan_exp(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct i2c_client *client = to_i2c_client(dev);
	struct f75375_data *data = i2c_get_clientdata(client);
	int val = simple_strtoul(buf, NULL, 10);

	mutex_lock(&data->update_lock);
	data->fan_exp[nr] = rpm_to_reg(val);
	f75375_write16(client, F75375_REG_FAN_EXP(nr), data->fan_exp[nr]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct i2c_client *client = to_i2c_client(dev);
	struct f75375_data *data = i2c_get_clientdata(client);
	int val = simple_strtoul(buf, NULL, 10);

	mutex_lock(&data->update_lock);
	data->pwm[nr] = SENSORS_LIMIT(val, 0, 255);
	f75375_write8(client, F75375_REG_FAN_PWM_DUTY(nr), data->pwm[nr]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t show_pwm_enable(struct device *dev, struct device_attribute
		*attr, char *buf)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct f75375_data *data = f75375_update_device(dev);
	return sprintf(buf, "%d\n", data->pwm_enable[nr]);
}

static ssize_t set_pwm_enable(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct i2c_client *client = to_i2c_client(dev);
	struct f75375_data *data = i2c_get_clientdata(client);
	int val = simple_strtoul(buf, NULL, 10);
	u8 fanmode;

	if (val < 0 || val > 4)
		return -EINVAL;

	mutex_lock(&data->update_lock);
	fanmode = f75375_read8(client, F75375_REG_FAN_TIMER);
	fanmode = ~(3 << FAN_CTRL_MODE(nr));

	switch (val) {
	case 0: /* Full speed */
		fanmode  |= (3 << FAN_CTRL_MODE(nr));
		data->pwm[nr] = 255;
		f75375_write8(client, F75375_REG_FAN_PWM_DUTY(nr),
				data->pwm[nr]);
		break;
	case 1: /* PWM */
		fanmode  |= (3 << FAN_CTRL_MODE(nr));
		break;
	case 2: /* AUTOMATIC*/
		fanmode  |= (2 << FAN_CTRL_MODE(nr));
		break;
	case 3: /* fan speed */
		break;
	}
	f75375_write8(client, F75375_REG_FAN_TIMER, fanmode);
	data->pwm_enable[nr] = val;
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t set_pwm_mode(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct i2c_client *client = to_i2c_client(dev);
	struct f75375_data *data = i2c_get_clientdata(client);
	int val = simple_strtoul(buf, NULL, 10);
	u8 conf = 0;

	if (val != 0 || val != 1 || data->kind == f75373)
		return -EINVAL;

	mutex_lock(&data->update_lock);
	conf = f75375_read8(client, F75375_REG_CONFIG1);
	conf = ~(1 << FAN_CTRL_LINEAR(nr));

	if (val == 0)
		conf |= (1 << FAN_CTRL_LINEAR(nr)) ;

	f75375_write8(client, F75375_REG_CONFIG1, conf);
	data->pwm_mode[nr] = val;
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t show_pwm(struct device *dev, struct device_attribute
		*attr, char *buf)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct f75375_data *data = f75375_update_device(dev);
	return sprintf(buf, "%d\n", data->pwm[nr]);
}

static ssize_t show_pwm_mode(struct device *dev, struct device_attribute
		*attr, char *buf)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct f75375_data *data = f75375_update_device(dev);
	return sprintf(buf, "%d\n", data->pwm_mode[nr]);
}

#define VOLT_FROM_REG(val) ((val) * 8)
#define VOLT_TO_REG(val) ((val) / 8)

static ssize_t show_in(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct f75375_data *data = f75375_update_device(dev);
	return sprintf(buf, "%d\n", VOLT_FROM_REG(data->in[nr]));
}

static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct f75375_data *data = f75375_update_device(dev);
	return sprintf(buf, "%d\n", VOLT_FROM_REG(data->in_max[nr]));
}

static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct f75375_data *data = f75375_update_device(dev);
	return sprintf(buf, "%d\n", VOLT_FROM_REG(data->in_min[nr]));
}

static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct i2c_client *client = to_i2c_client(dev);
	struct f75375_data *data = i2c_get_clientdata(client);
	int val = simple_strtoul(buf, NULL, 10);
	val = SENSORS_LIMIT(VOLT_TO_REG(val), 0, 0xff);
	mutex_lock(&data->update_lock);
	data->in_max[nr] = val;
	f75375_write8(client, F75375_REG_VOLT_HIGH(nr), data->in_max[nr]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct i2c_client *client = to_i2c_client(dev);
	struct f75375_data *data = i2c_get_clientdata(client);
	int val = simple_strtoul(buf, NULL, 10);
	val = SENSORS_LIMIT(VOLT_TO_REG(val), 0, 0xff);
	mutex_lock(&data->update_lock);
	data->in_min[nr] = val;
	f75375_write8(client, F75375_REG_VOLT_LOW(nr), data->in_min[nr]);
	mutex_unlock(&data->update_lock);
	return count;
}
#define TEMP_FROM_REG(val) ((val) * 1000)
#define TEMP_TO_REG(val) ((val) / 1000)

static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct f75375_data *data = f75375_update_device(dev);
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
}

static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct f75375_data *data = f75375_update_device(dev);
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[nr]));
}

static ssize_t show_temp_max_hyst(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct f75375_data *data = f75375_update_device(dev);
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max_hyst[nr]));
}

static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct i2c_client *client = to_i2c_client(dev);
	struct f75375_data *data = i2c_get_clientdata(client);
	int val = simple_strtol(buf, NULL, 10);
	val = SENSORS_LIMIT(TEMP_TO_REG(val), 0, 127);
	mutex_lock(&data->update_lock);
	data->temp_high[nr] = val;
	f75375_write8(client, F75375_REG_TEMP_HIGH(nr), data->temp_high[nr]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t set_temp_max_hyst(struct device *dev,
	struct device_attribute *attr, const char *buf, size_t count)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct i2c_client *client = to_i2c_client(dev);
	struct f75375_data *data = i2c_get_clientdata(client);
	int val = simple_strtol(buf, NULL, 10);
	val = SENSORS_LIMIT(TEMP_TO_REG(val), 0, 127);
	mutex_lock(&data->update_lock);
	data->temp_max_hyst[nr] = val;
	f75375_write8(client, F75375_REG_TEMP_HYST(nr),
		data->temp_max_hyst[nr]);
	mutex_unlock(&data->update_lock);
	return count;
}

#define show_fan(thing) \
static ssize_t show_##thing(struct device *dev, struct device_attribute *attr, \
			char *buf)\
{\
	int nr = to_sensor_dev_attr(attr)->index;\
	struct f75375_data *data = f75375_update_device(dev); \
	return sprintf(buf, "%d\n", rpm_from_reg(data->thing[nr])); \
}

show_fan(fan);
show_fan(fan_min);
show_fan(fan_full);
show_fan(fan_exp);

static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, show_in, NULL, 0);
static SENSOR_DEVICE_ATTR(in0_max, S_IRUGO|S_IWUSR,
	show_in_max, set_in_max, 0);
static SENSOR_DEVICE_ATTR(in0_min, S_IRUGO|S_IWUSR,
	show_in_min, set_in_min, 0);
static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_in, NULL, 1);
static SENSOR_DEVICE_ATTR(in1_max, S_IRUGO|S_IWUSR,
	show_in_max, set_in_max, 1);
static SENSOR_DEVICE_ATTR(in1_min, S_IRUGO|S_IWUSR,
	show_in_min, set_in_min, 1);
static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_in, NULL, 2);
static SENSOR_DEVICE_ATTR(in2_max, S_IRUGO|S_IWUSR,
	show_in_max, set_in_max, 2);
static SENSOR_DEVICE_ATTR(in2_min, S_IRUGO|S_IWUSR,
	show_in_min, set_in_min, 2);
static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_in, NULL, 3);
static SENSOR_DEVICE_ATTR(in3_max, S_IRUGO|S_IWUSR,
	show_in_max, set_in_max, 3);
static SENSOR_DEVICE_ATTR(in3_min, S_IRUGO|S_IWUSR,
	show_in_min, set_in_min, 3);
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IRUGO|S_IWUSR,
	show_temp_max_hyst, set_temp_max_hyst, 0);
static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO|S_IWUSR,
	show_temp_max, set_temp_max, 0);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
static SENSOR_DEVICE_ATTR(temp2_max_hyst, S_IRUGO|S_IWUSR,
	show_temp_max_hyst, set_temp_max_hyst, 1);
static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO|S_IWUSR,
	show_temp_max, set_temp_max, 1);
static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
static SENSOR_DEVICE_ATTR(fan1_full, S_IRUGO, show_fan_full, NULL, 0);
static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO|S_IWUSR,
	show_fan_min, set_fan_min, 0);
static SENSOR_DEVICE_ATTR(fan1_exp, S_IRUGO|S_IWUSR,
	show_fan_exp, set_fan_exp, 0);
static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
static SENSOR_DEVICE_ATTR(fan2_full, S_IRUGO, show_fan_full, NULL, 1);
static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO|S_IWUSR,
	show_fan_min, set_fan_min, 1);
static SENSOR_DEVICE_ATTR(fan2_exp, S_IRUGO|S_IWUSR,
	show_fan_exp, set_fan_exp, 1);
static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO|S_IWUSR,
	show_pwm, set_pwm, 0);
static SENSOR_DEVICE_ATTR(pwm1_enable, S_IRUGO|S_IWUSR,
	show_pwm_enable, set_pwm_enable, 0);
static SENSOR_DEVICE_ATTR(pwm1_mode, S_IRUGO|S_IWUSR,
	show_pwm_mode, set_pwm_mode, 0);
static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR,
	show_pwm, set_pwm, 1);
static SENSOR_DEVICE_ATTR(pwm2_enable, S_IRUGO|S_IWUSR,
	show_pwm_enable, set_pwm_enable, 1);
static SENSOR_DEVICE_ATTR(pwm2_mode, S_IRUGO|S_IWUSR,
	show_pwm_mode, set_pwm_mode, 1);

static struct attribute *f75375_attributes[] = {
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp2_max.dev_attr.attr,
	&sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
	&sensor_dev_attr_fan1_input.dev_attr.attr,
	&sensor_dev_attr_fan1_full.dev_attr.attr,
	&sensor_dev_attr_fan1_min.dev_attr.attr,
	&sensor_dev_attr_fan1_exp.dev_attr.attr,
	&sensor_dev_attr_fan2_input.dev_attr.attr,
	&sensor_dev_attr_fan2_full.dev_attr.attr,
	&sensor_dev_attr_fan2_min.dev_attr.attr,
	&sensor_dev_attr_fan2_exp.dev_attr.attr,
	&sensor_dev_attr_pwm1.dev_attr.attr,
	&sensor_dev_attr_pwm1_enable.dev_attr.attr,
	&sensor_dev_attr_pwm1_mode.dev_attr.attr,
	&sensor_dev_attr_pwm2.dev_attr.attr,
	&sensor_dev_attr_pwm2_enable.dev_attr.attr,
	&sensor_dev_attr_pwm2_mode.dev_attr.attr,
	&sensor_dev_attr_in0_input.dev_attr.attr,
	&sensor_dev_attr_in0_max.dev_attr.attr,
	&sensor_dev_attr_in0_min.dev_attr.attr,
	&sensor_dev_attr_in1_input.dev_attr.attr,
	&sensor_dev_attr_in1_max.dev_attr.attr,
	&sensor_dev_attr_in1_min.dev_attr.attr,
	&sensor_dev_attr_in2_input.dev_attr.attr,
	&sensor_dev_attr_in2_max.dev_attr.attr,
	&sensor_dev_attr_in2_min.dev_attr.attr,
	&sensor_dev_attr_in3_input.dev_attr.attr,
	&sensor_dev_attr_in3_max.dev_attr.attr,
	&sensor_dev_attr_in3_min.dev_attr.attr,
	NULL
};

static const struct attribute_group f75375_group = {
	.attrs = f75375_attributes,
};

static int f75375_detach_client(struct i2c_client *client)
{
	struct f75375_data *data = i2c_get_clientdata(client);
	int err;

	hwmon_device_unregister(data->class_dev);
	sysfs_remove_group(&client->dev.kobj, &f75375_group);

	err = i2c_detach_client(client);
	if (err) {
		dev_err(&client->dev,
			"Client deregistration failed, "
			"client not detached.\n");
		return err;
	}
	kfree(data);
	return 0;
}

static int f75375_attach_adapter(struct i2c_adapter *adapter)
{
	if (!(adapter->class & I2C_CLASS_HWMON))
		return 0;
	return i2c_probe(adapter, &addr_data, f75375_detect);
}

/* This function is called by i2c_probe */
static int f75375_detect(struct i2c_adapter *adapter, int address, int kind)
{
	struct i2c_client *client;
	struct f75375_data *data;
	u8 version = 0;
	int err = 0;
	const char *name = "";

	if (!(data = kzalloc(sizeof(struct f75375_data), GFP_KERNEL))) {
		err = -ENOMEM;
		goto exit;
	}
	client = &data->client;
	i2c_set_clientdata(client, data);
	client->addr = address;
	client->adapter = adapter;
	client->driver = &f75375_driver;

	if (kind < 0) {
		u16 vendid = f75375_read16(client, F75375_REG_VENDOR);
		u16 chipid = f75375_read16(client, F75375_CHIP_ID);
		version = f75375_read8(client, F75375_REG_VERSION);
		if (chipid == 0x0306 && vendid == 0x1934) {
			kind = f75375;
		} else if (chipid == 0x0204 && vendid == 0x1934) {
			kind = f75373;
		} else {
			dev_err(&adapter->dev,
				"failed,%02X,%02X,%02X\n",
				chipid, version, vendid);
			goto exit_free;
		}
	}

	if (kind == f75375) {
		name = "f75375";
	} else if (kind == f75373) {
		name = "f75373";
	}

	dev_info(&adapter->dev, "found %s version: %02X\n", name, version);
	strlcpy(client->name, name, I2C_NAME_SIZE);
	data->kind = kind;
	mutex_init(&data->update_lock);
	if ((err = i2c_attach_client(client)))
		goto exit_free;

	if ((err = sysfs_create_group(&client->dev.kobj, &f75375_group)))
		goto exit_detach;

	data->class_dev = hwmon_device_register(&client->dev);
	if (IS_ERR(data->class_dev)) {
		err = PTR_ERR(data->class_dev);
		goto exit_remove;
	}

	return 0;

exit_remove:
	sysfs_remove_group(&client->dev.kobj, &f75375_group);
exit_detach:
	i2c_detach_client(client);
exit_free:
	kfree(data);
exit:
	return err;
}

static int __init sensors_f75375_init(void)
{
	return i2c_add_driver(&f75375_driver);
}

static void __exit sensors_f75375_exit(void)
{
	i2c_del_driver(&f75375_driver);
}

MODULE_AUTHOR("Riku Voipio <riku.voipio@movial.fi>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("F75373/F75375 hardware monitoring driver");

module_init(sensors_f75375_init);
module_exit(sensors_f75375_exit);