it87.c 36.7 KB
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/*
    it87.c - Part of lm_sensors, Linux kernel modules for hardware
             monitoring.

    Supports: IT8705F  Super I/O chip w/LPC interface & SMBus
              IT8712F  Super I/O chip w/LPC interface & SMBus
              Sis950   A clone of the IT8705F

    Copyright (C) 2001 Chris Gauthron <chrisg@0-in.com> 
    Largely inspired by lm78.c of the same package

    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.
*/

/*
    djg@pdp8.net David Gesswein 7/18/01
    Modified to fix bug with not all alarms enabled.
    Added ability to read battery voltage and select temperature sensor
    type at module load time.
*/

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/i2c-sensor.h>
#include <linux/i2c-vid.h>
#include <asm/io.h>


/* Addresses to scan */
static unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
					0x2e, 0x2f, I2C_CLIENT_END };
static unsigned int normal_isa[] = { 0x0290, I2C_CLIENT_ISA_END };

/* Insmod parameters */
SENSORS_INSMOD_2(it87, it8712);

#define	REG	0x2e	/* The register to read/write */
#define	DEV	0x07	/* Register: Logical device select */
#define	VAL	0x2f	/* The value to read/write */
#define PME	0x04	/* The device with the fan registers in it */
#define	DEVID	0x20	/* Register: Device ID */
#define	DEVREV	0x22	/* Register: Device Revision */

static inline int
superio_inb(int reg)
{
	outb(reg, REG);
	return inb(VAL);
}

static int superio_inw(int reg)
{
	int val;
	outb(reg++, REG);
	val = inb(VAL) << 8;
	outb(reg, REG);
	val |= inb(VAL);
	return val;
}

static inline void
superio_select(void)
{
	outb(DEV, REG);
	outb(PME, VAL);
}

static inline void
superio_enter(void)
{
	outb(0x87, REG);
	outb(0x01, REG);
	outb(0x55, REG);
	outb(0x55, REG);
}

static inline void
superio_exit(void)
{
	outb(0x02, REG);
	outb(0x02, VAL);
}

#define IT8712F_DEVID 0x8712
#define IT8705F_DEVID 0x8705
#define IT87_ACT_REG  0x30
#define IT87_BASE_REG 0x60

/* Update battery voltage after every reading if true */
static int update_vbat;

/* Not all BIOSes properly configure the PWM registers */
static int fix_pwm_polarity;

/* Chip Type */

static u16 chip_type;

/* Many IT87 constants specified below */

/* Length of ISA address segment */
#define IT87_EXTENT 8

/* Where are the ISA address/data registers relative to the base address */
#define IT87_ADDR_REG_OFFSET 5
#define IT87_DATA_REG_OFFSET 6

/*----- The IT87 registers -----*/

#define IT87_REG_CONFIG        0x00

#define IT87_REG_ALARM1        0x01
#define IT87_REG_ALARM2        0x02
#define IT87_REG_ALARM3        0x03

#define IT87_REG_VID           0x0a
#define IT87_REG_FAN_DIV       0x0b

/* Monitors: 9 voltage (0 to 7, battery), 3 temp (1 to 3), 3 fan (1 to 3) */

#define IT87_REG_FAN(nr)       (0x0d + (nr))
#define IT87_REG_FAN_MIN(nr)   (0x10 + (nr))
#define IT87_REG_FAN_MAIN_CTRL 0x13
#define IT87_REG_FAN_CTL       0x14
#define IT87_REG_PWM(nr)       (0x15 + (nr))

#define IT87_REG_VIN(nr)       (0x20 + (nr))
#define IT87_REG_TEMP(nr)      (0x29 + (nr))

#define IT87_REG_VIN_MAX(nr)   (0x30 + (nr) * 2)
#define IT87_REG_VIN_MIN(nr)   (0x31 + (nr) * 2)
#define IT87_REG_TEMP_HIGH(nr) (0x40 + (nr) * 2)
#define IT87_REG_TEMP_LOW(nr)  (0x41 + (nr) * 2)

#define IT87_REG_I2C_ADDR      0x48

#define IT87_REG_VIN_ENABLE    0x50
#define IT87_REG_TEMP_ENABLE   0x51

#define IT87_REG_CHIPID        0x58

#define IN_TO_REG(val)  (SENSORS_LIMIT((((val) + 8)/16),0,255))
#define IN_FROM_REG(val) ((val) * 16)

static inline u8 FAN_TO_REG(long rpm, int div)
{
	if (rpm == 0)
		return 255;
	rpm = SENSORS_LIMIT(rpm, 1, 1000000);
	return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1,
			     254);
}

#define FAN_FROM_REG(val,div) ((val)==0?-1:(val)==255?0:1350000/((val)*(div)))

#define TEMP_TO_REG(val) (SENSORS_LIMIT(((val)<0?(((val)-500)/1000):\
					((val)+500)/1000),-128,127))
#define TEMP_FROM_REG(val) (((val)>0x80?(val)-0x100:(val))*1000)

#define PWM_TO_REG(val)   ((val) >> 1)
#define PWM_FROM_REG(val) (((val)&0x7f) << 1)

static int DIV_TO_REG(int val)
{
	int answer = 0;
	while ((val >>= 1) != 0)
		answer++;
	return answer;
}
#define DIV_FROM_REG(val) (1 << (val))


/* For each registered IT87, we need to keep some data in memory. That
   data is pointed to by it87_list[NR]->data. The structure itself is
   dynamically allocated, at the same time when a new it87 client is
   allocated. */
struct it87_data {
	struct i2c_client client;
	struct semaphore lock;
	enum chips type;

	struct semaphore update_lock;
	char valid;		/* !=0 if following fields are valid */
	unsigned long last_updated;	/* In jiffies */

	u8 in[9];		/* Register value */
	u8 in_max[9];		/* Register value */
	u8 in_min[9];		/* Register value */
	u8 fan[3];		/* Register value */
	u8 fan_min[3];		/* Register value */
	u8 temp[3];		/* Register value */
	u8 temp_high[3];	/* Register value */
	u8 temp_low[3];		/* Register value */
	u8 sensor;		/* Register value */
	u8 fan_div[3];		/* Register encoding, shifted right */
	u8 vid;			/* Register encoding, combined */
	int vrm;
	u32 alarms;		/* Register encoding, combined */
	u8 fan_main_ctrl;	/* Register value */
	u8 manual_pwm_ctl[3];   /* manual PWM value set by user */
};


static int it87_attach_adapter(struct i2c_adapter *adapter);
static int it87_find(int *address);
static int it87_detect(struct i2c_adapter *adapter, int address, int kind);
static int it87_detach_client(struct i2c_client *client);

static int it87_read_value(struct i2c_client *client, u8 register);
static int it87_write_value(struct i2c_client *client, u8 register,
			u8 value);
static struct it87_data *it87_update_device(struct device *dev);
static int it87_check_pwm(struct i2c_client *client);
static void it87_init_client(struct i2c_client *client, struct it87_data *data);


static struct i2c_driver it87_driver = {
	.owner		= THIS_MODULE,
	.name		= "it87",
	.id		= I2C_DRIVERID_IT87,
	.flags		= I2C_DF_NOTIFY,
	.attach_adapter	= it87_attach_adapter,
	.detach_client	= it87_detach_client,
};

static ssize_t show_in(struct device *dev, char *buf, int nr)
{
	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr]));
}

static ssize_t show_in_min(struct device *dev, char *buf, int nr)
{
	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr]));
}

static ssize_t show_in_max(struct device *dev, char *buf, int nr)
{
	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr]));
}

static ssize_t set_in_min(struct device *dev, const char *buf, 
		size_t count, int nr)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct it87_data *data = i2c_get_clientdata(client);
	unsigned long val = simple_strtoul(buf, NULL, 10);

	down(&data->update_lock);
	data->in_min[nr] = IN_TO_REG(val);
	it87_write_value(client, IT87_REG_VIN_MIN(nr), 
			data->in_min[nr]);
	up(&data->update_lock);
	return count;
}
static ssize_t set_in_max(struct device *dev, const char *buf, 
		size_t count, int nr)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct it87_data *data = i2c_get_clientdata(client);
	unsigned long val = simple_strtoul(buf, NULL, 10);

	down(&data->update_lock);
	data->in_max[nr] = IN_TO_REG(val);
	it87_write_value(client, IT87_REG_VIN_MAX(nr), 
			data->in_max[nr]);
	up(&data->update_lock);
	return count;
}

#define show_in_offset(offset)					\
static ssize_t							\
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	show_in##offset (struct device *dev, struct device_attribute *attr, char *buf)		\
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{								\
	return show_in(dev, buf, offset);			\
}								\
static DEVICE_ATTR(in##offset##_input, S_IRUGO, show_in##offset, NULL);

#define limit_in_offset(offset)					\
static ssize_t							\
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	show_in##offset##_min (struct device *dev, struct device_attribute *attr, char *buf)	\
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{								\
	return show_in_min(dev, buf, offset);			\
}								\
static ssize_t							\
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	show_in##offset##_max (struct device *dev, struct device_attribute *attr, char *buf)	\
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{								\
	return show_in_max(dev, buf, offset);			\
}								\
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static ssize_t set_in##offset##_min (struct device *dev, struct device_attribute *attr, 	\
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		const char *buf, size_t count) 			\
{								\
	return set_in_min(dev, buf, count, offset);		\
}								\
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static ssize_t set_in##offset##_max (struct device *dev, struct device_attribute *attr,	\
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			const char *buf, size_t count)		\
{								\
	return set_in_max(dev, buf, count, offset);		\
}								\
static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, 	\
		show_in##offset##_min, set_in##offset##_min);	\
static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, 	\
		show_in##offset##_max, set_in##offset##_max);

show_in_offset(0);
limit_in_offset(0);
show_in_offset(1);
limit_in_offset(1);
show_in_offset(2);
limit_in_offset(2);
show_in_offset(3);
limit_in_offset(3);
show_in_offset(4);
limit_in_offset(4);
show_in_offset(5);
limit_in_offset(5);
show_in_offset(6);
limit_in_offset(6);
show_in_offset(7);
limit_in_offset(7);
show_in_offset(8);

/* 3 temperatures */
static ssize_t show_temp(struct device *dev, char *buf, int nr)
{
	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
}
static ssize_t show_temp_max(struct device *dev, char *buf, int nr)
{
	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[nr]));
}
static ssize_t show_temp_min(struct device *dev, char *buf, int nr)
{
	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_low[nr]));
}
static ssize_t set_temp_max(struct device *dev, const char *buf, 
		size_t count, int nr)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct it87_data *data = i2c_get_clientdata(client);
	int val = simple_strtol(buf, NULL, 10);

	down(&data->update_lock);
	data->temp_high[nr] = TEMP_TO_REG(val);
	it87_write_value(client, IT87_REG_TEMP_HIGH(nr), data->temp_high[nr]);
	up(&data->update_lock);
	return count;
}
static ssize_t set_temp_min(struct device *dev, const char *buf, 
		size_t count, int nr)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct it87_data *data = i2c_get_clientdata(client);
	int val = simple_strtol(buf, NULL, 10);

	down(&data->update_lock);
	data->temp_low[nr] = TEMP_TO_REG(val);
	it87_write_value(client, IT87_REG_TEMP_LOW(nr), data->temp_low[nr]);
	up(&data->update_lock);
	return count;
}
#define show_temp_offset(offset)					\
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static ssize_t show_temp_##offset (struct device *dev, struct device_attribute *attr, char *buf)	\
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{									\
	return show_temp(dev, buf, offset - 1);				\
}									\
static ssize_t								\
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show_temp_##offset##_max (struct device *dev, struct device_attribute *attr, char *buf)		\
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{									\
	return show_temp_max(dev, buf, offset - 1);			\
}									\
static ssize_t								\
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show_temp_##offset##_min (struct device *dev, struct device_attribute *attr, char *buf)		\
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{									\
	return show_temp_min(dev, buf, offset - 1);			\
}									\
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static ssize_t set_temp_##offset##_max (struct device *dev, struct device_attribute *attr, 		\
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		const char *buf, size_t count) 				\
{									\
	return set_temp_max(dev, buf, count, offset - 1);		\
}									\
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static ssize_t set_temp_##offset##_min (struct device *dev, struct device_attribute *attr, 		\
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		const char *buf, size_t count) 				\
{									\
	return set_temp_min(dev, buf, count, offset - 1);		\
}									\
static DEVICE_ATTR(temp##offset##_input, S_IRUGO, show_temp_##offset, NULL); \
static DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, 		\
		show_temp_##offset##_max, set_temp_##offset##_max); 	\
static DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, 		\
		show_temp_##offset##_min, set_temp_##offset##_min);	

show_temp_offset(1);
show_temp_offset(2);
show_temp_offset(3);

static ssize_t show_sensor(struct device *dev, char *buf, int nr)
{
	struct it87_data *data = it87_update_device(dev);
	u8 reg = data->sensor; /* In case the value is updated while we use it */
	
	if (reg & (1 << nr))
		return sprintf(buf, "3\n");  /* thermal diode */
	if (reg & (8 << nr))
		return sprintf(buf, "2\n");  /* thermistor */
	return sprintf(buf, "0\n");      /* disabled */
}
static ssize_t set_sensor(struct device *dev, const char *buf, 
		size_t count, int nr)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct it87_data *data = i2c_get_clientdata(client);
	int val = simple_strtol(buf, NULL, 10);

	down(&data->update_lock);

	data->sensor &= ~(1 << nr);
	data->sensor &= ~(8 << nr);
	/* 3 = thermal diode; 2 = thermistor; 0 = disabled */
	if (val == 3)
	    data->sensor |= 1 << nr;
	else if (val == 2)
	    data->sensor |= 8 << nr;
	else if (val != 0) {
		up(&data->update_lock);
		return -EINVAL;
	}
	it87_write_value(client, IT87_REG_TEMP_ENABLE, data->sensor);
	up(&data->update_lock);
	return count;
}
#define show_sensor_offset(offset)					\
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static ssize_t show_sensor_##offset (struct device *dev, struct device_attribute *attr, char *buf)	\
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{									\
	return show_sensor(dev, buf, offset - 1);			\
}									\
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static ssize_t set_sensor_##offset (struct device *dev, struct device_attribute *attr, 		\
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		const char *buf, size_t count) 				\
{									\
	return set_sensor(dev, buf, count, offset - 1);			\
}									\
static DEVICE_ATTR(temp##offset##_type, S_IRUGO | S_IWUSR, 		\
		show_sensor_##offset, set_sensor_##offset);

show_sensor_offset(1);
show_sensor_offset(2);
show_sensor_offset(3);

/* 3 Fans */
static ssize_t show_fan(struct device *dev, char *buf, int nr)
{
	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf,"%d\n", FAN_FROM_REG(data->fan[nr], 
				DIV_FROM_REG(data->fan_div[nr])));
}
static ssize_t show_fan_min(struct device *dev, char *buf, int nr)
{
	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf,"%d\n",
		FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr])));
}
static ssize_t show_fan_div(struct device *dev, char *buf, int nr)
{
	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
}
static ssize_t show_pwm_enable(struct device *dev, char *buf, int nr)
{
	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf,"%d\n", (data->fan_main_ctrl & (1 << nr)) ? 1 : 0);
}
static ssize_t show_pwm(struct device *dev, char *buf, int nr)
{
	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf,"%d\n", data->manual_pwm_ctl[nr]);
}
static ssize_t set_fan_min(struct device *dev, const char *buf, 
		size_t count, int nr)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct it87_data *data = i2c_get_clientdata(client);
	int val = simple_strtol(buf, NULL, 10);

	down(&data->update_lock);
	data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
	it87_write_value(client, IT87_REG_FAN_MIN(nr), data->fan_min[nr]);
	up(&data->update_lock);
	return count;
}
static ssize_t set_fan_div(struct device *dev, const char *buf, 
		size_t count, int nr)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct it87_data *data = i2c_get_clientdata(client);
	int val = simple_strtol(buf, NULL, 10);
	int i, min[3];
	u8 old;

	down(&data->update_lock);
	old = it87_read_value(client, IT87_REG_FAN_DIV);

	for (i = 0; i < 3; i++)
		min[i] = FAN_FROM_REG(data->fan_min[i], DIV_FROM_REG(data->fan_div[i]));

	switch (nr) {
	case 0:
	case 1:
		data->fan_div[nr] = DIV_TO_REG(val);
		break;
	case 2:
		if (val < 8)
			data->fan_div[nr] = 1;
		else
			data->fan_div[nr] = 3;
	}
	val = old & 0x80;
	val |= (data->fan_div[0] & 0x07);
	val |= (data->fan_div[1] & 0x07) << 3;
	if (data->fan_div[2] == 3)
		val |= 0x1 << 6;
	it87_write_value(client, IT87_REG_FAN_DIV, val);

	for (i = 0; i < 3; i++) {
		data->fan_min[i]=FAN_TO_REG(min[i], DIV_FROM_REG(data->fan_div[i]));
		it87_write_value(client, IT87_REG_FAN_MIN(i), data->fan_min[i]);
	}
	up(&data->update_lock);
	return count;
}
static ssize_t set_pwm_enable(struct device *dev, const char *buf,
		size_t count, int nr)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct it87_data *data = i2c_get_clientdata(client);
	int val = simple_strtol(buf, NULL, 10);

	down(&data->update_lock);

	if (val == 0) {
		int tmp;
		/* make sure the fan is on when in on/off mode */
		tmp = it87_read_value(client, IT87_REG_FAN_CTL);
		it87_write_value(client, IT87_REG_FAN_CTL, tmp | (1 << nr));
		/* set on/off mode */
		data->fan_main_ctrl &= ~(1 << nr);
		it87_write_value(client, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
	} else if (val == 1) {
		/* set SmartGuardian mode */
		data->fan_main_ctrl |= (1 << nr);
		it87_write_value(client, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
		/* set saved pwm value, clear FAN_CTLX PWM mode bit */
		it87_write_value(client, IT87_REG_PWM(nr), PWM_TO_REG(data->manual_pwm_ctl[nr]));
	} else {
		up(&data->update_lock);
		return -EINVAL;
	}

	up(&data->update_lock);
	return count;
}
static ssize_t set_pwm(struct device *dev, const char *buf,
		size_t count, int nr)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct it87_data *data = i2c_get_clientdata(client);
	int val = simple_strtol(buf, NULL, 10);

	if (val < 0 || val > 255)
		return -EINVAL;

	down(&data->update_lock);
	data->manual_pwm_ctl[nr] = val;
	if (data->fan_main_ctrl & (1 << nr))
		it87_write_value(client, IT87_REG_PWM(nr), PWM_TO_REG(data->manual_pwm_ctl[nr]));
	up(&data->update_lock);
	return count;
}

#define show_fan_offset(offset)						\
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static ssize_t show_fan_##offset (struct device *dev, struct device_attribute *attr, char *buf)	\
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{									\
	return show_fan(dev, buf, offset - 1);				\
}									\
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static ssize_t show_fan_##offset##_min (struct device *dev, struct device_attribute *attr, char *buf)	\
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{									\
	return show_fan_min(dev, buf, offset - 1);			\
}									\
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static ssize_t show_fan_##offset##_div (struct device *dev, struct device_attribute *attr, char *buf)	\
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{									\
	return show_fan_div(dev, buf, offset - 1);			\
}									\
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static ssize_t set_fan_##offset##_min (struct device *dev, struct device_attribute *attr, 		\
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	const char *buf, size_t count) 					\
{									\
	return set_fan_min(dev, buf, count, offset - 1);		\
}									\
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static ssize_t set_fan_##offset##_div (struct device *dev, struct device_attribute *attr, 		\
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		const char *buf, size_t count) 				\
{									\
	return set_fan_div(dev, buf, count, offset - 1);		\
}									\
static DEVICE_ATTR(fan##offset##_input, S_IRUGO, show_fan_##offset, NULL); \
static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, 		\
		show_fan_##offset##_min, set_fan_##offset##_min); 	\
static DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, 		\
		show_fan_##offset##_div, set_fan_##offset##_div);

show_fan_offset(1);
show_fan_offset(2);
show_fan_offset(3);

#define show_pwm_offset(offset)						\
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static ssize_t show_pwm##offset##_enable (struct device *dev, struct device_attribute *attr,		\
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	char *buf)							\
{									\
	return show_pwm_enable(dev, buf, offset - 1);			\
}									\
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static ssize_t show_pwm##offset (struct device *dev, struct device_attribute *attr, char *buf)		\
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{									\
	return show_pwm(dev, buf, offset - 1);				\
}									\
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static ssize_t set_pwm##offset##_enable (struct device *dev, struct device_attribute *attr,		\
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		const char *buf, size_t count)				\
{									\
	return set_pwm_enable(dev, buf, count, offset - 1);		\
}									\
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static ssize_t set_pwm##offset (struct device *dev, struct device_attribute *attr,			\
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		const char *buf, size_t count)				\
{									\
	return set_pwm(dev, buf, count, offset - 1);			\
}									\
static DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR,		\
		show_pwm##offset##_enable,				\
		set_pwm##offset##_enable);				\
static DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR,			\
		show_pwm##offset , set_pwm##offset );

show_pwm_offset(1);
show_pwm_offset(2);
show_pwm_offset(3);

/* Alarms */
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static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
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{
	struct it87_data *data = it87_update_device(dev);
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	return sprintf(buf, "%u\n", data->alarms);
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}
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static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
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static ssize_t
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show_vrm_reg(struct device *dev, struct device_attribute *attr, char *buf)
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{
	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf, "%ld\n", (long) data->vrm);
}
static ssize_t
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store_vrm_reg(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
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{
	struct i2c_client *client = to_i2c_client(dev);
	struct it87_data *data = i2c_get_clientdata(client);
	u32 val;

	val = simple_strtoul(buf, NULL, 10);
	data->vrm = val;

	return count;
}
static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm_reg, store_vrm_reg);
#define device_create_file_vrm(client) \
device_create_file(&client->dev, &dev_attr_vrm)

static ssize_t
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show_vid_reg(struct device *dev, struct device_attribute *attr, char *buf)
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{
	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf, "%ld\n", (long) vid_from_reg(data->vid, data->vrm));
}
static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid_reg, NULL);
#define device_create_file_vid(client) \
device_create_file(&client->dev, &dev_attr_cpu0_vid)

/* This function is called when:
     * it87_driver is inserted (when this module is loaded), for each
       available adapter
     * when a new adapter is inserted (and it87_driver is still present) */
static int it87_attach_adapter(struct i2c_adapter *adapter)
{
	if (!(adapter->class & I2C_CLASS_HWMON))
		return 0;
	return i2c_detect(adapter, &addr_data, it87_detect);
}

/* SuperIO detection - will change normal_isa[0] if a chip is found */
static int it87_find(int *address)
{
	int err = -ENODEV;

	superio_enter();
	chip_type = superio_inw(DEVID);
	if (chip_type != IT8712F_DEVID
	 && chip_type != IT8705F_DEVID)
	 	goto exit;

	superio_select();
	if (!(superio_inb(IT87_ACT_REG) & 0x01)) {
		pr_info("it87: Device not activated, skipping\n");
		goto exit;
	}

	*address = superio_inw(IT87_BASE_REG) & ~(IT87_EXTENT - 1);
	if (*address == 0) {
		pr_info("it87: Base address not set, skipping\n");
		goto exit;
	}

	err = 0;
	pr_info("it87: Found IT%04xF chip at 0x%x, revision %d\n",
		chip_type, *address, superio_inb(DEVREV) & 0x0f);

exit:
	superio_exit();
	return err;
}

/* This function is called by i2c_detect */
int it87_detect(struct i2c_adapter *adapter, int address, int kind)
{
	int i;
	struct i2c_client *new_client;
	struct it87_data *data;
	int err = 0;
	const char *name = "";
	int is_isa = i2c_is_isa_adapter(adapter);
	int enable_pwm_interface;

	if (!is_isa && 
	    !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		goto ERROR0;

	/* Reserve the ISA region */
	if (is_isa)
		if (!request_region(address, IT87_EXTENT, it87_driver.name))
			goto ERROR0;

	/* Probe whether there is anything available on this address. Already
	   done for SMBus and Super-I/O clients */
	if (kind < 0) {
		if (is_isa && !chip_type) {
#define REALLY_SLOW_IO
			/* We need the timeouts for at least some IT87-like chips. But only
			   if we read 'undefined' registers. */
			i = inb_p(address + 1);
			if (inb_p(address + 2) != i
			 || inb_p(address + 3) != i
			 || inb_p(address + 7) != i) {
		 		err = -ENODEV;
				goto ERROR1;
			}
#undef REALLY_SLOW_IO

			/* Let's just hope nothing breaks here */
			i = inb_p(address + 5) & 0x7f;
			outb_p(~i & 0x7f, address + 5);
			if ((inb_p(address + 5) & 0x7f) != (~i & 0x7f)) {
				outb_p(i, address + 5);
				err = -ENODEV;
				goto ERROR1;
			}
		}
	}

	/* OK. For now, we presume we have a valid client. We now create the
	   client structure, even though we cannot fill it completely yet.
	   But it allows us to access it87_{read,write}_value. */

	if (!(data = kmalloc(sizeof(struct it87_data), GFP_KERNEL))) {
		err = -ENOMEM;
		goto ERROR1;
	}
	memset(data, 0, sizeof(struct it87_data));

	new_client = &data->client;
	if (is_isa)
		init_MUTEX(&data->lock);
	i2c_set_clientdata(new_client, data);
	new_client->addr = address;
	new_client->adapter = adapter;
	new_client->driver = &it87_driver;
	new_client->flags = 0;

	/* Now, we do the remaining detection. */

	if (kind < 0) {
		if ((it87_read_value(new_client, IT87_REG_CONFIG) & 0x80)
		  || (!is_isa
		   && it87_read_value(new_client, IT87_REG_I2C_ADDR) != address)) {
		   	err = -ENODEV;
			goto ERROR2;
		}
	}

	/* Determine the chip type. */
	if (kind <= 0) {
		i = it87_read_value(new_client, IT87_REG_CHIPID);
		if (i == 0x90) {
			kind = it87;
			if ((is_isa) && (chip_type == IT8712F_DEVID))
				kind = it8712;
		}
		else {
			if (kind == 0)
				dev_info(&adapter->dev, 
					"Ignoring 'force' parameter for unknown chip at "
					"adapter %d, address 0x%02x\n",
					i2c_adapter_id(adapter), address);
			err = -ENODEV;
			goto ERROR2;
		}
	}

	if (kind == it87) {
		name = "it87";
	} else if (kind == it8712) {
		name = "it8712";
	}

	/* Fill in the remaining client fields and put it into the global list */
	strlcpy(new_client->name, name, I2C_NAME_SIZE);
	data->type = kind;
	data->valid = 0;
	init_MUTEX(&data->update_lock);

	/* Tell the I2C layer a new client has arrived */
	if ((err = i2c_attach_client(new_client)))
		goto ERROR2;

	/* Check PWM configuration */
	enable_pwm_interface = it87_check_pwm(new_client);

	/* Initialize the IT87 chip */
	it87_init_client(new_client, data);

	/* Register sysfs hooks */
	device_create_file(&new_client->dev, &dev_attr_in0_input);
	device_create_file(&new_client->dev, &dev_attr_in1_input);
	device_create_file(&new_client->dev, &dev_attr_in2_input);
	device_create_file(&new_client->dev, &dev_attr_in3_input);
	device_create_file(&new_client->dev, &dev_attr_in4_input);
	device_create_file(&new_client->dev, &dev_attr_in5_input);
	device_create_file(&new_client->dev, &dev_attr_in6_input);
	device_create_file(&new_client->dev, &dev_attr_in7_input);
	device_create_file(&new_client->dev, &dev_attr_in8_input);
	device_create_file(&new_client->dev, &dev_attr_in0_min);
	device_create_file(&new_client->dev, &dev_attr_in1_min);
	device_create_file(&new_client->dev, &dev_attr_in2_min);
	device_create_file(&new_client->dev, &dev_attr_in3_min);
	device_create_file(&new_client->dev, &dev_attr_in4_min);
	device_create_file(&new_client->dev, &dev_attr_in5_min);
	device_create_file(&new_client->dev, &dev_attr_in6_min);
	device_create_file(&new_client->dev, &dev_attr_in7_min);
	device_create_file(&new_client->dev, &dev_attr_in0_max);
	device_create_file(&new_client->dev, &dev_attr_in1_max);
	device_create_file(&new_client->dev, &dev_attr_in2_max);
	device_create_file(&new_client->dev, &dev_attr_in3_max);
	device_create_file(&new_client->dev, &dev_attr_in4_max);
	device_create_file(&new_client->dev, &dev_attr_in5_max);
	device_create_file(&new_client->dev, &dev_attr_in6_max);
	device_create_file(&new_client->dev, &dev_attr_in7_max);
	device_create_file(&new_client->dev, &dev_attr_temp1_input);
	device_create_file(&new_client->dev, &dev_attr_temp2_input);
	device_create_file(&new_client->dev, &dev_attr_temp3_input);
	device_create_file(&new_client->dev, &dev_attr_temp1_max);
	device_create_file(&new_client->dev, &dev_attr_temp2_max);
	device_create_file(&new_client->dev, &dev_attr_temp3_max);
	device_create_file(&new_client->dev, &dev_attr_temp1_min);
	device_create_file(&new_client->dev, &dev_attr_temp2_min);
	device_create_file(&new_client->dev, &dev_attr_temp3_min);
	device_create_file(&new_client->dev, &dev_attr_temp1_type);
	device_create_file(&new_client->dev, &dev_attr_temp2_type);
	device_create_file(&new_client->dev, &dev_attr_temp3_type);
	device_create_file(&new_client->dev, &dev_attr_fan1_input);
	device_create_file(&new_client->dev, &dev_attr_fan2_input);
	device_create_file(&new_client->dev, &dev_attr_fan3_input);
	device_create_file(&new_client->dev, &dev_attr_fan1_min);
	device_create_file(&new_client->dev, &dev_attr_fan2_min);
	device_create_file(&new_client->dev, &dev_attr_fan3_min);
	device_create_file(&new_client->dev, &dev_attr_fan1_div);
	device_create_file(&new_client->dev, &dev_attr_fan2_div);
	device_create_file(&new_client->dev, &dev_attr_fan3_div);
	device_create_file(&new_client->dev, &dev_attr_alarms);
	if (enable_pwm_interface) {
		device_create_file(&new_client->dev, &dev_attr_pwm1_enable);
		device_create_file(&new_client->dev, &dev_attr_pwm2_enable);
		device_create_file(&new_client->dev, &dev_attr_pwm3_enable);
		device_create_file(&new_client->dev, &dev_attr_pwm1);
		device_create_file(&new_client->dev, &dev_attr_pwm2);
		device_create_file(&new_client->dev, &dev_attr_pwm3);
	}

	if (data->type == it8712) {
		data->vrm = i2c_which_vrm();
		device_create_file_vrm(new_client);
		device_create_file_vid(new_client);
	}

	return 0;

ERROR2:
	kfree(data);
ERROR1:
	if (is_isa)
		release_region(address, IT87_EXTENT);
ERROR0:
	return err;
}

static int it87_detach_client(struct i2c_client *client)
{
	int err;

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

	if(i2c_is_isa_client(client))
		release_region(client->addr, IT87_EXTENT);
	kfree(i2c_get_clientdata(client));

	return 0;
}

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/* The SMBus locks itself, but ISA access must be locked explicitly! 
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   We don't want to lock the whole ISA bus, so we lock each client
   separately.
   We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
   would slow down the IT87 access and should not be necessary. */
static int it87_read_value(struct i2c_client *client, u8 reg)
{
	struct it87_data *data = i2c_get_clientdata(client);

	int res;
	if (i2c_is_isa_client(client)) {
		down(&data->lock);
		outb_p(reg, client->addr + IT87_ADDR_REG_OFFSET);
		res = inb_p(client->addr + IT87_DATA_REG_OFFSET);
		up(&data->lock);
		return res;
	} else
		return i2c_smbus_read_byte_data(client, reg);
}

974
/* The SMBus locks itself, but ISA access muse be locked explicitly! 
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   We don't want to lock the whole ISA bus, so we lock each client
   separately.
   We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
   would slow down the IT87 access and should not be necessary. */
static int it87_write_value(struct i2c_client *client, u8 reg, u8 value)
{
	struct it87_data *data = i2c_get_clientdata(client);

	if (i2c_is_isa_client(client)) {
		down(&data->lock);
		outb_p(reg, client->addr + IT87_ADDR_REG_OFFSET);
		outb_p(value, client->addr + IT87_DATA_REG_OFFSET);
		up(&data->lock);
		return 0;
	} else
		return i2c_smbus_write_byte_data(client, reg, value);
}

/* Return 1 if and only if the PWM interface is safe to use */
static int it87_check_pwm(struct i2c_client *client)
{
	/* Some BIOSes fail to correctly configure the IT87 fans. All fans off
	 * and polarity set to active low is sign that this is the case so we
	 * disable pwm control to protect the user. */
	int tmp = it87_read_value(client, IT87_REG_FAN_CTL);
	if ((tmp & 0x87) == 0) {
		if (fix_pwm_polarity) {
			/* The user asks us to attempt a chip reconfiguration.
			 * This means switching to active high polarity and
			 * inverting all fan speed values. */
			int i;
			u8 pwm[3];

			for (i = 0; i < 3; i++)
				pwm[i] = it87_read_value(client,
							 IT87_REG_PWM(i));

			/* If any fan is in automatic pwm mode, the polarity
			 * might be correct, as suspicious as it seems, so we
			 * better don't change anything (but still disable the
			 * PWM interface). */
			if (!((pwm[0] | pwm[1] | pwm[2]) & 0x80)) {
				dev_info(&client->dev, "Reconfiguring PWM to "
					 "active high polarity\n");
				it87_write_value(client, IT87_REG_FAN_CTL,
						 tmp | 0x87);
				for (i = 0; i < 3; i++)
					it87_write_value(client,
							 IT87_REG_PWM(i),
							 0x7f & ~pwm[i]);
				return 1;
			}

			dev_info(&client->dev, "PWM configuration is "
				 "too broken to be fixed\n");
		}

		dev_info(&client->dev, "Detected broken BIOS "
			 "defaults, disabling PWM interface\n");
		return 0;
	} else if (fix_pwm_polarity) {
		dev_info(&client->dev, "PWM configuration looks "
			 "sane, won't touch\n");
	}

	return 1;
}

/* Called when we have found a new IT87. */
static void it87_init_client(struct i2c_client *client, struct it87_data *data)
{
	int tmp, i;

	/* initialize to sane defaults:
	 * - if the chip is in manual pwm mode, this will be overwritten with
	 *   the actual settings on the chip (so in this case, initialization
	 *   is not needed)
	 * - if in automatic or on/off mode, we could switch to manual mode,
	 *   read the registers and set manual_pwm_ctl accordingly, but currently
	 *   this is not implemented, so we initialize to something sane */
	for (i = 0; i < 3; i++) {
		data->manual_pwm_ctl[i] = 0xff;
	}

	/* Check if temperature channnels are reset manually or by some reason */
	tmp = it87_read_value(client, IT87_REG_TEMP_ENABLE);
	if ((tmp & 0x3f) == 0) {
		/* Temp1,Temp3=thermistor; Temp2=thermal diode */
		tmp = (tmp & 0xc0) | 0x2a;
		it87_write_value(client, IT87_REG_TEMP_ENABLE, tmp);
	}
	data->sensor = tmp;

	/* Check if voltage monitors are reset manually or by some reason */
	tmp = it87_read_value(client, IT87_REG_VIN_ENABLE);
	if ((tmp & 0xff) == 0) {
		/* Enable all voltage monitors */
		it87_write_value(client, IT87_REG_VIN_ENABLE, 0xff);
	}

	/* Check if tachometers are reset manually or by some reason */
	data->fan_main_ctrl = it87_read_value(client, IT87_REG_FAN_MAIN_CTRL);
	if ((data->fan_main_ctrl & 0x70) == 0) {
		/* Enable all fan tachometers */
		data->fan_main_ctrl |= 0x70;
		it87_write_value(client, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
	}

	/* Set current fan mode registers and the default settings for the
	 * other mode registers */
	for (i = 0; i < 3; i++) {
		if (data->fan_main_ctrl & (1 << i)) {
			/* pwm mode */
			tmp = it87_read_value(client, IT87_REG_PWM(i));
			if (tmp & 0x80) {
				/* automatic pwm - not yet implemented, but
				 * leave the settings made by the BIOS alone
				 * until a change is requested via the sysfs
				 * interface */
			} else {
				/* manual pwm */
				data->manual_pwm_ctl[i] = PWM_FROM_REG(tmp);
			}
		}
 	}

	/* Start monitoring */
	it87_write_value(client, IT87_REG_CONFIG,
			 (it87_read_value(client, IT87_REG_CONFIG) & 0x36)
			 | (update_vbat ? 0x41 : 0x01));
}

static struct it87_data *it87_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct it87_data *data = i2c_get_clientdata(client);
	int i;

	down(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	    || !data->valid) {

		if (update_vbat) {
			/* Cleared after each update, so reenable.  Value
		 	  returned by this read will be previous value */	
			it87_write_value(client, IT87_REG_CONFIG,
			   it87_read_value(client, IT87_REG_CONFIG) | 0x40);
		}
		for (i = 0; i <= 7; i++) {
			data->in[i] =
			    it87_read_value(client, IT87_REG_VIN(i));
			data->in_min[i] =
			    it87_read_value(client, IT87_REG_VIN_MIN(i));
			data->in_max[i] =
			    it87_read_value(client, IT87_REG_VIN_MAX(i));
		}
		data->in[8] =
		    it87_read_value(client, IT87_REG_VIN(8));
		/* Temperature sensor doesn't have limit registers, set
		   to min and max value */
		data->in_min[8] = 0;
		data->in_max[8] = 255;

		for (i = 0; i < 3; i++) {
			data->fan[i] =
			    it87_read_value(client, IT87_REG_FAN(i));
			data->fan_min[i] =
			    it87_read_value(client, IT87_REG_FAN_MIN(i));
		}
		for (i = 0; i < 3; i++) {
			data->temp[i] =
			    it87_read_value(client, IT87_REG_TEMP(i));
			data->temp_high[i] =
			    it87_read_value(client, IT87_REG_TEMP_HIGH(i));
			data->temp_low[i] =
			    it87_read_value(client, IT87_REG_TEMP_LOW(i));
		}

		i = it87_read_value(client, IT87_REG_FAN_DIV);
		data->fan_div[0] = i & 0x07;
		data->fan_div[1] = (i >> 3) & 0x07;
		data->fan_div[2] = (i & 0x40) ? 3 : 1;

		data->alarms =
			it87_read_value(client, IT87_REG_ALARM1) |
			(it87_read_value(client, IT87_REG_ALARM2) << 8) |
			(it87_read_value(client, IT87_REG_ALARM3) << 16);
		data->fan_main_ctrl = it87_read_value(client, IT87_REG_FAN_MAIN_CTRL);

		data->sensor = it87_read_value(client, IT87_REG_TEMP_ENABLE);
		/* The 8705 does not have VID capability */
		if (data->type == it8712) {
			data->vid = it87_read_value(client, IT87_REG_VID);
			data->vid &= 0x1f;
		}
		data->last_updated = jiffies;
		data->valid = 1;
	}

	up(&data->update_lock);

	return data;
}

static int __init sm_it87_init(void)
{
	int addr;

	if (!it87_find(&addr)) {
		normal_isa[0] = addr;
	}
	return i2c_add_driver(&it87_driver);
}

static void __exit sm_it87_exit(void)
{
	i2c_del_driver(&it87_driver);
}


MODULE_AUTHOR("Chris Gauthron <chrisg@0-in.com>");
MODULE_DESCRIPTION("IT8705F, IT8712F, Sis950 driver");
module_param(update_vbat, bool, 0);
MODULE_PARM_DESC(update_vbat, "Update vbat if set else return powerup value");
module_param(fix_pwm_polarity, bool, 0);
MODULE_PARM_DESC(fix_pwm_polarity, "Force PWM polarity to active high (DANGEROUS)");
MODULE_LICENSE("GPL");

module_init(sm_it87_init);
module_exit(sm_it87_exit);