/*

   *  it87.c - Part of lm_sensors, Linux kernel modules for hardware
   *           monitoring.
   *
   *  The IT8705F is an LPC-based Super I/O part that contains UARTs, a
   *  parallel port, an IR port, a MIDI port, a floppy controller, etc., in
   *  addition to an Environment Controller (Enhanced Hardware Monitor and
   *  Fan Controller)
   *
   *  This driver supports only the Environment Controller in the IT8705F and
   *  similar parts.  The other devices are supported by different drivers.
   *
   *  Supports: IT8705F  Super I/O chip w/LPC interface
   *            IT8712F  Super I/O chip w/LPC interface
   *            IT8716F  Super I/O chip w/LPC interface
   *            IT8718F  Super I/O chip w/LPC interface
   *            IT8720F  Super I/O chip w/LPC interface

   *            IT8721F  Super I/O chip w/LPC interface

   *            IT8726F  Super I/O chip w/LPC interface

   *            IT8758E  Super I/O chip w/LPC interface

   *            Sis950   A clone of the IT8705F
   *
   *  Copyright (C) 2001 Chris Gauthron
   *  Copyright (C) 2005-2010 Jean Delvare <khali@linux-fr.org>
   *
   *  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.
   */

  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

  #include <linux/module.h>
  #include <linux/init.h>
  #include <linux/slab.h>
  #include <linux/jiffies.h>

  #include <linux/platform_device.h>

  #include <linux/hwmon.h>

  #include <linux/hwmon-sysfs.h>
  #include <linux/hwmon-vid.h>

  #include <linux/err.h>

  #include <linux/mutex.h>

  #include <linux/sysfs.h>

  #include <linux/string.h>
  #include <linux/dmi.h>

  #include <linux/acpi.h>

  #include <linux/io.h>

  #define DRVNAME "it87"

  enum chips { it87, it8712, it8716, it8718, it8720, it8721 };

  static unsigned short force_id;
  module_param(force_id, ushort, 0);
  MODULE_PARM_DESC(force_id, "Override the detected device ID");

  static struct platform_device *pdev;

  #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 */

  
  /* The device with the IT8718F/IT8720F VID value in it */
  #define GPIO	0x07

  #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 inline void superio_outb(int reg, int val)

  {
  	outb(reg, REG);
  	outb(val, 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(int ldn)

  {
  	outb(DEV, REG);

  	outb(ldn, VAL);

  }

  static inline int superio_enter(void)

  {

  	/*
  	 * Try to reserve REG and REG + 1 for exclusive access.
  	 */
  	if (!request_muxed_region(REG, 2, DRVNAME))
  		return -EBUSY;

  	outb(0x87, REG);
  	outb(0x01, REG);
  	outb(0x55, REG);
  	outb(0x55, REG);

  	return 0;

  }

  static inline void superio_exit(void)

  {
  	outb(0x02, REG);
  	outb(0x02, VAL);

  	release_region(REG, 2);

  }

  /* Logical device 4 registers */

  #define IT8712F_DEVID 0x8712
  #define IT8705F_DEVID 0x8705

  #define IT8716F_DEVID 0x8716

  #define IT8718F_DEVID 0x8718

  #define IT8720F_DEVID 0x8720

  #define IT8721F_DEVID 0x8721

  #define IT8726F_DEVID 0x8726

  #define IT87_ACT_REG  0x30
  #define IT87_BASE_REG 0x60

  /* Logical device 7 registers (IT8712F and later) */

  #define IT87_SIO_GPIO3_REG	0x27

  #define IT87_SIO_GPIO5_REG	0x29

  #define IT87_SIO_PINX2_REG	0x2c	/* Pin selection */
  #define IT87_SIO_VID_REG	0xfc	/* VID value */

  #define IT87_SIO_BEEP_PIN_REG	0xf6	/* Beep pin mapping */

  /* Update battery voltage after every reading if true */

  static bool update_vbat;

  
  /* Not all BIOSes properly configure the PWM registers */

  static bool fix_pwm_polarity;

  /* Many IT87 constants specified below */
  
  /* Length of ISA address segment */
  #define IT87_EXTENT 8

  /* Length of ISA address segment for Environmental Controller */
  #define IT87_EC_EXTENT 2
  
  /* Offset of EC registers from ISA base address */
  #define IT87_EC_OFFSET 5
  
  /* Where are the ISA address/data registers relative to the EC base address */
  #define IT87_ADDR_REG_OFFSET 0
  #define IT87_DATA_REG_OFFSET 1

  
  /*----- The IT87 registers -----*/
  
  #define IT87_REG_CONFIG        0x00
  
  #define IT87_REG_ALARM1        0x01
  #define IT87_REG_ALARM2        0x02
  #define IT87_REG_ALARM3        0x03

  /* The IT8718F and IT8720F have the VID value in a different register, in
     Super-I/O configuration space. */

  #define IT87_REG_VID           0x0a

  /* The IT8705F and IT8712F earlier than revision 0x08 use register 0x0b
     for fan divisors. Later IT8712F revisions must use 16-bit tachometer
     mode. */

  #define IT87_REG_FAN_DIV       0x0b

  #define IT87_REG_FAN_16BIT     0x0c

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

  static const u8 IT87_REG_FAN[]		= { 0x0d, 0x0e, 0x0f, 0x80, 0x82 };
  static const u8 IT87_REG_FAN_MIN[]	= { 0x10, 0x11, 0x12, 0x84, 0x86 };
  static const u8 IT87_REG_FANX[]		= { 0x18, 0x19, 0x1a, 0x81, 0x83 };
  static const u8 IT87_REG_FANX_MIN[]	= { 0x1b, 0x1c, 0x1d, 0x85, 0x87 };

  #define IT87_REG_FAN_MAIN_CTRL 0x13
  #define IT87_REG_FAN_CTL       0x14
  #define IT87_REG_PWM(nr)       (0x15 + (nr))

  #define IT87_REG_PWM_DUTY(nr)  (0x63 + (nr) * 8)

  
  #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_VIN_ENABLE    0x50
  #define IT87_REG_TEMP_ENABLE   0x51

  #define IT87_REG_BEEP_ENABLE   0x5c

  
  #define IT87_REG_CHIPID        0x58

  #define IT87_REG_AUTO_TEMP(nr, i) (0x60 + (nr) * 8 + (i))
  #define IT87_REG_AUTO_PWM(nr, i)  (0x65 + (nr) * 8 + (i))

  struct it87_sio_data {
  	enum chips type;
  	/* Values read from Super-I/O config space */

  	u8 revision;

  	u8 vid_value;

  	u8 beep_pin;

  	u8 internal;	/* Internal sensors can be labeled */

  	/* Features skipped based on config or DMI */

  	u8 skip_vid;

  	u8 skip_fan;

  	u8 skip_pwm;

  };

  /* For each registered chip, we need to keep some data in memory.
     The structure is dynamically allocated. */

  struct it87_data {

  	struct device *hwmon_dev;

  	enum chips type;

  	u8 revision;

  	unsigned short addr;
  	const char *name;

  	struct mutex update_lock;

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

  	u16 in_scaled;		/* Internal voltage sensors are scaled */

  	u8 in[9];		/* Register value */

  	u8 in_max[8];		/* Register value */
  	u8 in_min[8];		/* Register value */

  	u8 has_fan;		/* Bitfield, fans enabled */

  	u16 fan[5];		/* Register values, possibly combined */
  	u16 fan_min[5];		/* Register values, possibly combined */

  	s8 temp[3];		/* Register value */
  	s8 temp_high[3];	/* Register value */
  	s8 temp_low[3];		/* Register value */

  	u8 sensor;		/* Register value */
  	u8 fan_div[3];		/* Register encoding, shifted right */
  	u8 vid;			/* Register encoding, combined */

  	u8 vrm;

  	u32 alarms;		/* Register encoding, combined */

  	u8 beeps;		/* Register encoding */

  	u8 fan_main_ctrl;	/* Register value */

  	u8 fan_ctl;		/* Register value */

  	/* The following 3 arrays correspond to the same registers up to
  	 * the IT8720F. The meaning of bits 6-0 depends on the value of bit
  	 * 7, and we want to preserve settings on mode changes, so we have
  	 * to track all values separately.
  	 * Starting with the IT8721F, the manual PWM duty cycles are stored
  	 * in separate registers (8-bit values), so the separate tracking
  	 * is no longer needed, but it is still done to keep the driver
  	 * simple. */

  	u8 pwm_ctrl[3];		/* Register value */

  	u8 pwm_duty[3];		/* Manual PWM value set by user */

  	u8 pwm_temp_map[3];	/* PWM to temp. chan. mapping (bits 1-0) */

  
  	/* Automatic fan speed control registers */
  	u8 auto_pwm[3][4];	/* [nr][3] is hard-coded */
  	s8 auto_temp[3][5];	/* [nr][0] is point1_temp_hyst */

  };

  static u8 in_to_reg(const struct it87_data *data, int nr, long val)
  {
  	long lsb;
  
  	if (data->type == it8721) {
  		if (data->in_scaled & (1 << nr))
  			lsb = 24;
  		else
  			lsb = 12;
  	} else
  		lsb = 16;
  
  	val = DIV_ROUND_CLOSEST(val, lsb);
  	return SENSORS_LIMIT(val, 0, 255);
  }
  
  static int in_from_reg(const struct it87_data *data, int nr, int val)
  {
  	if (data->type == it8721) {
  		if (data->in_scaled & (1 << nr))
  			return val * 24;
  		else
  			return val * 12;
  	} else
  		return 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);
  }
  
  static inline u16 FAN16_TO_REG(long rpm)
  {
  	if (rpm == 0)
  		return 0xffff;
  	return SENSORS_LIMIT((1350000 + rpm) / (rpm * 2), 1, 0xfffe);
  }
  
  #define FAN_FROM_REG(val, div) ((val) == 0 ? -1 : (val) == 255 ? 0 : \
  				1350000 / ((val) * (div)))
  /* The divider is fixed to 2 in 16-bit mode */
  #define FAN16_FROM_REG(val) ((val) == 0 ? -1 : (val) == 0xffff ? 0 : \
  			     1350000 / ((val) * 2))
  
  #define TEMP_TO_REG(val) (SENSORS_LIMIT(((val) < 0 ? (((val) - 500) / 1000) : \
  					((val) + 500) / 1000), -128, 127))
  #define TEMP_FROM_REG(val) ((val) * 1000)

  static u8 pwm_to_reg(const struct it87_data *data, long val)
  {
  	if (data->type == it8721)
  		return val;
  	else
  		return val >> 1;
  }
  
  static int pwm_from_reg(const struct it87_data *data, u8 reg)
  {
  	if (data->type == it8721)
  		return reg;
  	else
  		return (reg & 0x7f) << 1;
  }

  
  static int DIV_TO_REG(int val)
  {
  	int answer = 0;
  	while (answer < 7 && (val >>= 1))
  		answer++;
  	return answer;
  }
  #define DIV_FROM_REG(val) (1 << (val))
  
  static const unsigned int pwm_freq[8] = {
  	48000000 / 128,
  	24000000 / 128,
  	12000000 / 128,
  	8000000 / 128,
  	6000000 / 128,
  	3000000 / 128,
  	1500000 / 128,
  	750000 / 128,
  };

  static inline int has_16bit_fans(const struct it87_data *data)
  {

  	/* IT8705F Datasheet 0.4.1, 3h == Version G.

  	   IT8712F Datasheet 0.9.1, section 8.3.5 indicates 8h == Version J.

  	   These are the first revisions with 16bit tachometer support. */
  	return (data->type == it87 && data->revision >= 0x03)

  	    || (data->type == it8712 && data->revision >= 0x08)

  	    || data->type == it8716

  	    || data->type == it8718

  	    || data->type == it8720
  	    || data->type == it8721;

  }

  static inline int has_old_autopwm(const struct it87_data *data)
  {
  	/* The old automatic fan speed control interface is implemented
  	   by IT8705F chips up to revision F and IT8712F chips up to
  	   revision G. */
  	return (data->type == it87 && data->revision < 0x03)
  	    || (data->type == it8712 && data->revision < 0x08);
  }

  static int it87_probe(struct platform_device *pdev);

  static int __devexit it87_remove(struct platform_device *pdev);

  static int it87_read_value(struct it87_data *data, u8 reg);
  static void it87_write_value(struct it87_data *data, u8 reg, u8 value);

  static struct it87_data *it87_update_device(struct device *dev);

  static int it87_check_pwm(struct device *dev);
  static void it87_init_device(struct platform_device *pdev);

  static struct platform_driver it87_driver = {

  	.driver = {

  		.owner	= THIS_MODULE,

  		.name	= DRVNAME,

  	},

  	.probe	= it87_probe,
  	.remove	= __devexit_p(it87_remove),

  };

  static ssize_t show_in(struct device *dev, struct device_attribute *attr,
  		char *buf)

  {

  	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
  	int nr = sensor_attr->index;

  	struct it87_data *data = it87_update_device(dev);

  	return sprintf(buf, "%d
  ", in_from_reg(data, nr, data->in[nr]));

  }

  static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
  		char *buf)

  {

  	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
  	int nr = sensor_attr->index;

  	struct it87_data *data = it87_update_device(dev);

  	return sprintf(buf, "%d
  ", in_from_reg(data, nr, data->in_min[nr]));

  }

  static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
  		char *buf)

  {

  	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
  	int nr = sensor_attr->index;

  	struct it87_data *data = it87_update_device(dev);

  	return sprintf(buf, "%d
  ", in_from_reg(data, nr, data->in_max[nr]));

  }

  static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
  		const char *buf, size_t count)

  {

  	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
  	int nr = sensor_attr->index;

  	struct it87_data *data = dev_get_drvdata(dev);

  	unsigned long val;

  	if (kstrtoul(buf, 10, &val) < 0)

  		return -EINVAL;

  	mutex_lock(&data->update_lock);

  	data->in_min[nr] = in_to_reg(data, nr, val);

  	it87_write_value(data, IT87_REG_VIN_MIN(nr),

  			data->in_min[nr]);

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
  		const char *buf, size_t count)

  {

  	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
  	int nr = sensor_attr->index;

  	struct it87_data *data = dev_get_drvdata(dev);

  	unsigned long val;

  	if (kstrtoul(buf, 10, &val) < 0)

  		return -EINVAL;

  	mutex_lock(&data->update_lock);

  	data->in_max[nr] = in_to_reg(data, nr, val);

  	it87_write_value(data, IT87_REG_VIN_MAX(nr),

  			data->in_max[nr]);

  	mutex_unlock(&data->update_lock);

  	return count;
  }
  
  #define show_in_offset(offset)					\

  static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO,		\
  		show_in, NULL, offset);

  
  #define limit_in_offset(offset)					\

  static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,	\
  		show_in_min, set_in_min, offset);		\
  static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,	\
  		show_in_max, set_in_max, offset);

  
  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, struct device_attribute *attr,
  		char *buf)

  {

  	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
  	int nr = sensor_attr->index;

  	struct it87_data *data = it87_update_device(dev);
  	return sprintf(buf, "%d
  ", TEMP_FROM_REG(data->temp[nr]));
  }

  static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
  		char *buf)

  {

  	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
  	int nr = sensor_attr->index;

  	struct it87_data *data = it87_update_device(dev);
  	return sprintf(buf, "%d
  ", TEMP_FROM_REG(data->temp_high[nr]));
  }

  static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
  		char *buf)

  {

  	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
  	int nr = sensor_attr->index;

  	struct it87_data *data = it87_update_device(dev);
  	return sprintf(buf, "%d
  ", TEMP_FROM_REG(data->temp_low[nr]));
  }

  static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
  		const char *buf, size_t count)

  {

  	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
  	int nr = sensor_attr->index;

  	struct it87_data *data = dev_get_drvdata(dev);

  	long val;

  	if (kstrtol(buf, 10, &val) < 0)

  		return -EINVAL;

  	mutex_lock(&data->update_lock);

  	data->temp_high[nr] = TEMP_TO_REG(val);

  	it87_write_value(data, IT87_REG_TEMP_HIGH(nr), data->temp_high[nr]);

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
  		const char *buf, size_t count)

  {

  	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
  	int nr = sensor_attr->index;

  	struct it87_data *data = dev_get_drvdata(dev);

  	long val;

  	if (kstrtol(buf, 10, &val) < 0)

  		return -EINVAL;

  	mutex_lock(&data->update_lock);

  	data->temp_low[nr] = TEMP_TO_REG(val);

  	it87_write_value(data, IT87_REG_TEMP_LOW(nr), data->temp_low[nr]);

  	mutex_unlock(&data->update_lock);

  	return count;
  }
  #define show_temp_offset(offset)					\

  static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO,		\
  		show_temp, NULL, offset - 1);				\
  static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,	\
  		show_temp_max, set_temp_max, offset - 1);		\
  static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR,	\
  		show_temp_min, set_temp_min, offset - 1);

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

  static ssize_t show_sensor(struct device *dev, struct device_attribute *attr,
  		char *buf)

  {

  	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
  	int nr = sensor_attr->index;

  	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
  ");  /* thermal diode */
  	if (reg & (8 << nr))

  		return sprintf(buf, "4
  ");  /* thermistor */

  	return sprintf(buf, "0
  ");      /* disabled */
  }

  static ssize_t set_sensor(struct device *dev, struct device_attribute *attr,
  		const char *buf, size_t count)

  {

  	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
  	int nr = sensor_attr->index;

  	struct it87_data *data = dev_get_drvdata(dev);

  	long val;

  	u8 reg;

  	if (kstrtol(buf, 10, &val) < 0)

  		return -EINVAL;

  	reg = it87_read_value(data, IT87_REG_TEMP_ENABLE);
  	reg &= ~(1 << nr);
  	reg &= ~(8 << nr);

  	if (val == 2) {	/* backwards compatibility */
  		dev_warn(dev, "Sensor type 2 is deprecated, please use 4 "
  			 "instead
  ");
  		val = 4;
  	}
  	/* 3 = thermal diode; 4 = thermistor; 0 = disabled */

  	if (val == 3)

  		reg |= 1 << nr;

  	else if (val == 4)

  		reg |= 8 << nr;
  	else if (val != 0)

  		return -EINVAL;

  
  	mutex_lock(&data->update_lock);
  	data->sensor = reg;

  	it87_write_value(data, IT87_REG_TEMP_ENABLE, data->sensor);

  	data->valid = 0;	/* Force cache refresh */

  	mutex_unlock(&data->update_lock);

  	return count;
  }
  #define show_sensor_offset(offset)					\

  static SENSOR_DEVICE_ATTR(temp##offset##_type, S_IRUGO | S_IWUSR,	\
  		show_sensor, set_sensor, offset - 1);

  
  show_sensor_offset(1);
  show_sensor_offset(2);
  show_sensor_offset(3);
  
  /* 3 Fans */

  
  static int pwm_mode(const struct it87_data *data, int nr)
  {
  	int ctrl = data->fan_main_ctrl & (1 << nr);
  
  	if (ctrl == 0)					/* Full speed */
  		return 0;
  	if (data->pwm_ctrl[nr] & 0x80)			/* Automatic mode */
  		return 2;
  	else						/* Manual mode */
  		return 1;
  }

  static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
  		char *buf)

  {

  	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
  	int nr = sensor_attr->index;

  	struct it87_data *data = it87_update_device(dev);

  	return sprintf(buf, "%d
  ", FAN_FROM_REG(data->fan[nr],

  				DIV_FROM_REG(data->fan_div[nr])));
  }

  static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,
  		char *buf)

  {

  	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
  	int nr = sensor_attr->index;

  	struct it87_data *data = it87_update_device(dev);

  	return sprintf(buf, "%d
  ", FAN_FROM_REG(data->fan_min[nr],
  				DIV_FROM_REG(data->fan_div[nr])));

  }

  static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
  		char *buf)

  {

  	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
  	int nr = sensor_attr->index;

  	struct it87_data *data = it87_update_device(dev);
  	return sprintf(buf, "%d
  ", DIV_FROM_REG(data->fan_div[nr]));
  }

  static ssize_t show_pwm_enable(struct device *dev,
  		struct device_attribute *attr, char *buf)

  {

  	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
  	int nr = sensor_attr->index;

  	struct it87_data *data = it87_update_device(dev);

  	return sprintf(buf, "%d
  ", pwm_mode(data, nr));

  }

  static ssize_t show_pwm(struct device *dev, struct device_attribute *attr,
  		char *buf)

  {

  	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
  	int nr = sensor_attr->index;

  	struct it87_data *data = it87_update_device(dev);

  	return sprintf(buf, "%d
  ",
  		       pwm_from_reg(data, data->pwm_duty[nr]));

  }

  static ssize_t show_pwm_freq(struct device *dev, struct device_attribute *attr,
  		char *buf)
  {
  	struct it87_data *data = it87_update_device(dev);
  	int index = (data->fan_ctl >> 4) & 0x07;
  
  	return sprintf(buf, "%u
  ", pwm_freq[index]);
  }

  static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
  		const char *buf, size_t count)

  {

  	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
  	int nr = sensor_attr->index;

  	struct it87_data *data = dev_get_drvdata(dev);

  	long val;

  	u8 reg;

  	if (kstrtol(buf, 10, &val) < 0)

  		return -EINVAL;

  	mutex_lock(&data->update_lock);

  	reg = it87_read_value(data, IT87_REG_FAN_DIV);

  	switch (nr) {

  	case 0:
  		data->fan_div[nr] = reg & 0x07;
  		break;
  	case 1:
  		data->fan_div[nr] = (reg >> 3) & 0x07;
  		break;
  	case 2:
  		data->fan_div[nr] = (reg & 0x40) ? 3 : 1;
  		break;

  	}

  	data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));

  	it87_write_value(data, IT87_REG_FAN_MIN[nr], data->fan_min[nr]);

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
  		const char *buf, size_t count)

  {

  	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
  	int nr = sensor_attr->index;

  	struct it87_data *data = dev_get_drvdata(dev);

  	unsigned long val;

  	int min;

  	u8 old;

  	if (kstrtoul(buf, 10, &val) < 0)

  		return -EINVAL;

  	mutex_lock(&data->update_lock);

  	old = it87_read_value(data, IT87_REG_FAN_DIV);

  	/* Save fan min limit */
  	min = FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr]));

  
  	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(data, IT87_REG_FAN_DIV, val);

  	/* Restore fan min limit */
  	data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));

  	it87_write_value(data, IT87_REG_FAN_MIN[nr], data->fan_min[nr]);

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  
  /* Returns 0 if OK, -EINVAL otherwise */
  static int check_trip_points(struct device *dev, int nr)
  {
  	const struct it87_data *data = dev_get_drvdata(dev);
  	int i, err = 0;
  
  	if (has_old_autopwm(data)) {
  		for (i = 0; i < 3; i++) {
  			if (data->auto_temp[nr][i] > data->auto_temp[nr][i + 1])
  				err = -EINVAL;
  		}
  		for (i = 0; i < 2; i++) {
  			if (data->auto_pwm[nr][i] > data->auto_pwm[nr][i + 1])
  				err = -EINVAL;
  		}
  	}
  
  	if (err) {
  		dev_err(dev, "Inconsistent trip points, not switching to "
  			"automatic mode
  ");
  		dev_err(dev, "Adjust the trip points and try again
  ");
  	}
  	return err;
  }

  static ssize_t set_pwm_enable(struct device *dev,
  		struct device_attribute *attr, const char *buf, size_t count)

  {

  	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
  	int nr = sensor_attr->index;

  	struct it87_data *data = dev_get_drvdata(dev);

  	long val;

  	if (kstrtol(buf, 10, &val) < 0 || val < 0 || val > 2)

  		return -EINVAL;

  	/* Check trip points before switching to automatic mode */
  	if (val == 2) {
  		if (check_trip_points(dev, nr) < 0)
  			return -EINVAL;
  	}

  	mutex_lock(&data->update_lock);

  
  	if (val == 0) {
  		int tmp;
  		/* make sure the fan is on when in on/off mode */

  		tmp = it87_read_value(data, IT87_REG_FAN_CTL);
  		it87_write_value(data, IT87_REG_FAN_CTL, tmp | (1 << nr));

  		/* set on/off mode */
  		data->fan_main_ctrl &= ~(1 << nr);

  		it87_write_value(data, IT87_REG_FAN_MAIN_CTRL,
  				 data->fan_main_ctrl);

  	} else {
  		if (val == 1)				/* Manual mode */

  			data->pwm_ctrl[nr] = data->type == it8721 ?
  					     data->pwm_temp_map[nr] :
  					     data->pwm_duty[nr];

  		else					/* Automatic mode */
  			data->pwm_ctrl[nr] = 0x80 | data->pwm_temp_map[nr];
  		it87_write_value(data, IT87_REG_PWM(nr), data->pwm_ctrl[nr]);

  		/* set SmartGuardian mode */
  		data->fan_main_ctrl |= (1 << nr);

  		it87_write_value(data, IT87_REG_FAN_MAIN_CTRL,
  				 data->fan_main_ctrl);

  	}

  	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)

  {

  	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
  	int nr = sensor_attr->index;

  	struct it87_data *data = dev_get_drvdata(dev);

  	long val;

  	if (kstrtol(buf, 10, &val) < 0 || val < 0 || val > 255)

  		return -EINVAL;

  	mutex_lock(&data->update_lock);

  	if (data->type == it8721) {
  		/* If we are in automatic mode, the PWM duty cycle register
  		 * is read-only so we can't write the value */
  		if (data->pwm_ctrl[nr] & 0x80) {
  			mutex_unlock(&data->update_lock);
  			return -EBUSY;
  		}
  		data->pwm_duty[nr] = pwm_to_reg(data, val);
  		it87_write_value(data, IT87_REG_PWM_DUTY(nr),
  				 data->pwm_duty[nr]);
  	} else {
  		data->pwm_duty[nr] = pwm_to_reg(data, val);
  		/* If we are in manual mode, write the duty cycle immediately;
  		 * otherwise, just store it for later use. */
  		if (!(data->pwm_ctrl[nr] & 0x80)) {
  			data->pwm_ctrl[nr] = data->pwm_duty[nr];
  			it87_write_value(data, IT87_REG_PWM(nr),
  					 data->pwm_ctrl[nr]);
  		}

  	}

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  static ssize_t set_pwm_freq(struct device *dev,
  		struct device_attribute *attr, const char *buf, size_t count)
  {

  	struct it87_data *data = dev_get_drvdata(dev);

  	unsigned long val;

  	int i;

  	if (kstrtoul(buf, 10, &val) < 0)

  		return -EINVAL;

  	/* Search for the nearest available frequency */
  	for (i = 0; i < 7; i++) {
  		if (val > (pwm_freq[i] + pwm_freq[i+1]) / 2)
  			break;
  	}
  
  	mutex_lock(&data->update_lock);

  	data->fan_ctl = it87_read_value(data, IT87_REG_FAN_CTL) & 0x8f;

  	data->fan_ctl |= i << 4;

  	it87_write_value(data, IT87_REG_FAN_CTL, data->fan_ctl);

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

  static ssize_t show_pwm_temp_map(struct device *dev,
  		struct device_attribute *attr, char *buf)
  {
  	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
  	int nr = sensor_attr->index;
  
  	struct it87_data *data = it87_update_device(dev);
  	int map;
  
  	if (data->pwm_temp_map[nr] < 3)
  		map = 1 << data->pwm_temp_map[nr];
  	else
  		map = 0;			/* Should never happen */
  	return sprintf(buf, "%d
  ", map);
  }
  static ssize_t set_pwm_temp_map(struct device *dev,
  		struct device_attribute *attr, const char *buf, size_t count)
  {
  	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
  	int nr = sensor_attr->index;
  
  	struct it87_data *data = dev_get_drvdata(dev);
  	long val;
  	u8 reg;

  	/* This check can go away if we ever support automatic fan speed
  	   control on newer chips. */
  	if (!has_old_autopwm(data)) {
  		dev_notice(dev, "Mapping change disabled for safety reasons
  ");
  		return -EINVAL;
  	}

  	if (kstrtol(buf, 10, &val) < 0)

  		return -EINVAL;
  
  	switch (val) {
  	case (1 << 0):
  		reg = 0x00;
  		break;
  	case (1 << 1):
  		reg = 0x01;
  		break;
  	case (1 << 2):
  		reg = 0x02;
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	mutex_lock(&data->update_lock);
  	data->pwm_temp_map[nr] = reg;
  	/* If we are in automatic mode, write the temp mapping immediately;
  	 * otherwise, just store it for later use. */
  	if (data->pwm_ctrl[nr] & 0x80) {
  		data->pwm_ctrl[nr] = 0x80 | data->pwm_temp_map[nr];
  		it87_write_value(data, IT87_REG_PWM(nr), data->pwm_ctrl[nr]);
  	}
  	mutex_unlock(&data->update_lock);
  	return count;
  }

  static ssize_t show_auto_pwm(struct device *dev,
  		struct device_attribute *attr, char *buf)
  {
  	struct it87_data *data = it87_update_device(dev);
  	struct sensor_device_attribute_2 *sensor_attr =
  			to_sensor_dev_attr_2(attr);
  	int nr = sensor_attr->nr;
  	int point = sensor_attr->index;

  	return sprintf(buf, "%d
  ",
  		       pwm_from_reg(data, data->auto_pwm[nr][point]));

  }
  
  static ssize_t set_auto_pwm(struct device *dev,
  		struct device_attribute *attr, const char *buf, size_t count)
  {
  	struct it87_data *data = dev_get_drvdata(dev);
  	struct sensor_device_attribute_2 *sensor_attr =
  			to_sensor_dev_attr_2(attr);
  	int nr = sensor_attr->nr;
  	int point = sensor_attr->index;
  	long val;

  	if (kstrtol(buf, 10, &val) < 0 || val < 0 || val > 255)

  		return -EINVAL;
  
  	mutex_lock(&data->update_lock);

  	data->auto_pwm[nr][point] = pwm_to_reg(data, val);

  	it87_write_value(data, IT87_REG_AUTO_PWM(nr, point),
  			 data->auto_pwm[nr][point]);
  	mutex_unlock(&data->update_lock);
  	return count;
  }
  
  static ssize_t show_auto_temp(struct device *dev,
  		struct device_attribute *attr, char *buf)
  {
  	struct it87_data *data = it87_update_device(dev);
  	struct sensor_device_attribute_2 *sensor_attr =
  			to_sensor_dev_attr_2(attr);
  	int nr = sensor_attr->nr;
  	int point = sensor_attr->index;
  
  	return sprintf(buf, "%d
  ", TEMP_FROM_REG(data->auto_temp[nr][point]));
  }
  
  static ssize_t set_auto_temp(struct device *dev,
  		struct device_attribute *attr, const char *buf, size_t count)
  {
  	struct it87_data *data = dev_get_drvdata(dev);
  	struct sensor_device_attribute_2 *sensor_attr =
  			to_sensor_dev_attr_2(attr);
  	int nr = sensor_attr->nr;
  	int point = sensor_attr->index;
  	long val;

  	if (kstrtol(buf, 10, &val) < 0 || val < -128000 || val > 127000)

  		return -EINVAL;
  
  	mutex_lock(&data->update_lock);
  	data->auto_temp[nr][point] = TEMP_TO_REG(val);
  	it87_write_value(data, IT87_REG_AUTO_TEMP(nr, point),
  			 data->auto_temp[nr][point]);
  	mutex_unlock(&data->update_lock);
  	return count;
  }

  #define show_fan_offset(offset)					\
  static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO,		\
  		show_fan, NULL, offset - 1);			\
  static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
  		show_fan_min, set_fan_min, offset - 1);		\
  static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
  		show_fan_div, set_fan_div, offset - 1);

  
  show_fan_offset(1);
  show_fan_offset(2);
  show_fan_offset(3);
  
  #define show_pwm_offset(offset)						\

  static SENSOR_DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR,	\
  		show_pwm_enable, set_pwm_enable, offset - 1);		\
  static SENSOR_DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR,		\

  		show_pwm, set_pwm, offset - 1);				\
  static DEVICE_ATTR(pwm##offset##_freq,					\
  		(offset == 1 ? S_IRUGO | S_IWUSR : S_IRUGO),		\

  		show_pwm_freq, (offset == 1 ? set_pwm_freq : NULL));	\
  static SENSOR_DEVICE_ATTR(pwm##offset##_auto_channels_temp,		\

  		S_IRUGO | S_IWUSR, show_pwm_temp_map, set_pwm_temp_map,	\
  		offset - 1);						\
  static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point1_pwm,		\
  		S_IRUGO | S_IWUSR, show_auto_pwm, set_auto_pwm,		\
  		offset - 1, 0);						\
  static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point2_pwm,		\
  		S_IRUGO | S_IWUSR, show_auto_pwm, set_auto_pwm,		\
  		offset - 1, 1);						\
  static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point3_pwm,		\
  		S_IRUGO | S_IWUSR, show_auto_pwm, set_auto_pwm,		\
  		offset - 1, 2);						\
  static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point4_pwm,		\
  		S_IRUGO, show_auto_pwm, NULL, offset - 1, 3);		\
  static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point1_temp,		\
  		S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp,	\
  		offset - 1, 1);						\
  static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point1_temp_hyst,	\
  		S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp,	\
  		offset - 1, 0);						\
  static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point2_temp,		\
  		S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp,	\
  		offset - 1, 2);						\
  static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point3_temp,		\
  		S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp,	\
  		offset - 1, 3);						\
  static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point4_temp,		\
  		S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp,	\
  		offset - 1, 4);

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

  /* A different set of callbacks for 16-bit fans */
  static ssize_t show_fan16(struct device *dev, struct device_attribute *attr,
  		char *buf)
  {
  	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
  	int nr = sensor_attr->index;
  	struct it87_data *data = it87_update_device(dev);
  	return sprintf(buf, "%d
  ", FAN16_FROM_REG(data->fan[nr]));
  }
  
  static ssize_t show_fan16_min(struct device *dev, struct device_attribute *attr,
  		char *buf)
  {
  	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
  	int nr = sensor_attr->index;
  	struct it87_data *data = it87_update_device(dev);
  	return sprintf(buf, "%d
  ", FAN16_FROM_REG(data->fan_min[nr]));
  }
  
  static ssize_t set_fan16_min(struct device *dev, struct device_attribute *attr,
  		const char *buf, size_t count)
  {
  	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
  	int nr = sensor_attr->index;

  	struct it87_data *data = dev_get_drvdata(dev);

  	long val;

  	if (kstrtol(buf, 10, &val) < 0)

  		return -EINVAL;

  
  	mutex_lock(&data->update_lock);
  	data->fan_min[nr] = FAN16_TO_REG(val);

  	it87_write_value(data, IT87_REG_FAN_MIN[nr],

  			 data->fan_min[nr] & 0xff);

  	it87_write_value(data, IT87_REG_FANX_MIN[nr],

  			 data->fan_min[nr] >> 8);
  	mutex_unlock(&data->update_lock);
  	return count;
  }
  
  /* We want to use the same sysfs file names as 8-bit fans, but we need
     different variable names, so we have to use SENSOR_ATTR instead of
     SENSOR_DEVICE_ATTR. */
  #define show_fan16_offset(offset) \
  static struct sensor_device_attribute sensor_dev_attr_fan##offset##_input16 \
  	= SENSOR_ATTR(fan##offset##_input, S_IRUGO,		\
  		show_fan16, NULL, offset - 1);			\
  static struct sensor_device_attribute sensor_dev_attr_fan##offset##_min16 \
  	= SENSOR_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR,	\
  		show_fan16_min, set_fan16_min, offset - 1)
  
  show_fan16_offset(1);
  show_fan16_offset(2);
  show_fan16_offset(3);

  show_fan16_offset(4);
  show_fan16_offset(5);

  /* Alarms */

  static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
  		char *buf)

  {
  	struct it87_data *data = it87_update_device(dev);

  	return sprintf(buf, "%u
  ", data->alarms);

  }

  static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);

  static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
  		char *buf)
  {
  	int bitnr = to_sensor_dev_attr(attr)->index;
  	struct it87_data *data = it87_update_device(dev);
  	return sprintf(buf, "%u
  ", (data->alarms >> bitnr) & 1);
  }

  
  static ssize_t clear_intrusion(struct device *dev, struct device_attribute
  		*attr, const char *buf, size_t count)
  {
  	struct it87_data *data = dev_get_drvdata(dev);
  	long val;
  	int config;

  	if (kstrtol(buf, 10, &val) < 0 || val != 0)

  		return -EINVAL;
  
  	mutex_lock(&data->update_lock);
  	config = it87_read_value(data, IT87_REG_CONFIG);
  	if (config < 0) {
  		count = config;
  	} else {
  		config |= 1 << 5;
  		it87_write_value(data, IT87_REG_CONFIG, config);
  		/* Invalidate cache to force re-read */
  		data->valid = 0;
  	}
  	mutex_unlock(&data->update_lock);
  
  	return count;
  }

  static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 8);
  static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 9);
  static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 10);
  static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 11);
  static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 12);
  static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 13);
  static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 14);
  static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 15);
  static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 0);
  static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 1);
  static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 2);
  static SENSOR_DEVICE_ATTR(fan4_alarm, S_IRUGO, show_alarm, NULL, 3);
  static SENSOR_DEVICE_ATTR(fan5_alarm, S_IRUGO, show_alarm, NULL, 6);
  static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 16);
  static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 17);
  static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 18);

  static SENSOR_DEVICE_ATTR(intrusion0_alarm, S_IRUGO | S_IWUSR,
  			  show_alarm, clear_intrusion, 4);

  static ssize_t show_beep(struct device *dev, struct device_attribute *attr,
  		char *buf)
  {
  	int bitnr = to_sensor_dev_attr(attr)->index;
  	struct it87_data *data = it87_update_device(dev);
  	return sprintf(buf, "%u
  ", (data->beeps >> bitnr) & 1);
  }
  static ssize_t set_beep(struct device *dev, struct device_attribute *attr,
  		const char *buf, size_t count)
  {
  	int bitnr = to_sensor_dev_attr(attr)->index;
  	struct it87_data *data = dev_get_drvdata(dev);
  	long val;

  	if (kstrtol(buf, 10, &val) < 0

  	 || (val != 0 && val != 1))
  		return -EINVAL;
  
  	mutex_lock(&data->update_lock);
  	data->beeps = it87_read_value(data, IT87_REG_BEEP_ENABLE);
  	if (val)
  		data->beeps |= (1 << bitnr);
  	else
  		data->beeps &= ~(1 << bitnr);
  	it87_write_value(data, IT87_REG_BEEP_ENABLE, data->beeps);
  	mutex_unlock(&data->update_lock);
  	return count;
  }
  
  static SENSOR_DEVICE_ATTR(in0_beep, S_IRUGO | S_IWUSR,
  			  show_beep, set_beep, 1);
  static SENSOR_DEVICE_ATTR(in1_beep, S_IRUGO, show_beep, NULL, 1);
  static SENSOR_DEVICE_ATTR(in2_beep, S_IRUGO, show_beep, NULL, 1);
  static SENSOR_DEVICE_ATTR(in3_beep, S_IRUGO, show_beep, NULL, 1);
  static SENSOR_DEVICE_ATTR(in4_beep, S_IRUGO, show_beep, NULL, 1);
  static SENSOR_DEVICE_ATTR(in5_beep, S_IRUGO, show_beep, NULL, 1);
  static SENSOR_DEVICE_ATTR(in6_beep, S_IRUGO, show_beep, NULL, 1);
  static SENSOR_DEVICE_ATTR(in7_beep, S_IRUGO, show_beep, NULL, 1);
  /* fanX_beep writability is set later */
  static SENSOR_DEVICE_ATTR(fan1_beep, S_IRUGO, show_beep, set_beep, 0);
  static SENSOR_DEVICE_ATTR(fan2_beep, S_IRUGO, show_beep, set_beep, 0);
  static SENSOR_DEVICE_ATTR(fan3_beep, S_IRUGO, show_beep, set_beep, 0);
  static SENSOR_DEVICE_ATTR(fan4_beep, S_IRUGO, show_beep, set_beep, 0);
  static SENSOR_DEVICE_ATTR(fan5_beep, S_IRUGO, show_beep, set_beep, 0);
  static SENSOR_DEVICE_ATTR(temp1_beep, S_IRUGO | S_IWUSR,
  			  show_beep, set_beep, 2);
  static SENSOR_DEVICE_ATTR(temp2_beep, S_IRUGO, show_beep, NULL, 2);
  static SENSOR_DEVICE_ATTR(temp3_beep, S_IRUGO, show_beep, NULL, 2);

  static ssize_t show_vrm_reg(struct device *dev, struct device_attribute *attr,
  		char *buf)

  {

  	struct it87_data *data = dev_get_drvdata(dev);

  	return sprintf(buf, "%u
  ", data->vrm);

  }

  static ssize_t store_vrm_reg(struct device *dev, struct device_attribute *attr,
  		const char *buf, size_t count)

  {

  	struct it87_data *data = dev_get_drvdata(dev);

  	unsigned long val;

  	if (kstrtoul(buf, 10, &val) < 0)

  		return -EINVAL;

  	data->vrm = val;
  
  	return count;
  }
  static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm_reg, store_vrm_reg);

  static ssize_t show_vid_reg(struct device *dev, struct device_attribute *attr,
  		char *buf)

  {
  	struct it87_data *data = it87_update_device(dev);
  	return sprintf(buf, "%ld
  ", (long) vid_from_reg(data->vid, data->vrm));
  }
  static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid_reg, NULL);

  static ssize_t show_label(struct device *dev, struct device_attribute *attr,
  		char *buf)
  {
  	static const char *labels[] = {
  		"+5V",
  		"5VSB",
  		"Vbat",
  	};

  	static const char *labels_it8721[] = {
  		"+3.3V",
  		"3VSB",
  		"Vbat",
  	};
  	struct it87_data *data = dev_get_drvdata(dev);

  	int nr = to_sensor_dev_attr(attr)->index;

  	return sprintf(buf, "%s
  ", data->type == it8721 ? labels_it8721[nr]
  							 : labels[nr]);

  }
  static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL, 0);
  static SENSOR_DEVICE_ATTR(in7_label, S_IRUGO, show_label, NULL, 1);
  static SENSOR_DEVICE_ATTR(in8_label, S_IRUGO, show_label, NULL, 2);

  static ssize_t show_name(struct device *dev, struct device_attribute
  			 *devattr, char *buf)
  {
  	struct it87_data *data = dev_get_drvdata(dev);
  	return sprintf(buf, "%s
  ", data->name);
  }
  static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);

  static struct attribute *it87_attributes[] = {
  	&sensor_dev_attr_in0_input.dev_attr.attr,
  	&sensor_dev_attr_in1_input.dev_attr.attr,
  	&sensor_dev_attr_in2_input.dev_attr.attr,
  	&sensor_dev_attr_in3_input.dev_attr.attr,
  	&sensor_dev_attr_in4_input.dev_attr.attr,
  	&sensor_dev_attr_in5_input.dev_attr.attr,
  	&sensor_dev_attr_in6_input.dev_attr.attr,
  	&sensor_dev_attr_in7_input.dev_attr.attr,
  	&sensor_dev_attr_in8_input.dev_attr.attr,
  	&sensor_dev_attr_in0_min.dev_attr.attr,
  	&sensor_dev_attr_in1_min.dev_attr.attr,
  	&sensor_dev_attr_in2_min.dev_attr.attr,
  	&sensor_dev_attr_in3_min.dev_attr.attr,
  	&sensor_dev_attr_in4_min.dev_attr.attr,
  	&sensor_dev_attr_in5_min.dev_attr.attr,
  	&sensor_dev_attr_in6_min.dev_attr.attr,
  	&sensor_dev_attr_in7_min.dev_attr.attr,
  	&sensor_dev_attr_in0_max.dev_attr.attr,
  	&sensor_dev_attr_in1_max.dev_attr.attr,
  	&sensor_dev_attr_in2_max.dev_attr.attr,
  	&sensor_dev_attr_in3_max.dev_attr.attr,
  	&sensor_dev_attr_in4_max.dev_attr.attr,
  	&sensor_dev_attr_in5_max.dev_attr.attr,
  	&sensor_dev_attr_in6_max.dev_attr.attr,
  	&sensor_dev_attr_in7_max.dev_attr.attr,

  	&sensor_dev_attr_in0_alarm.dev_attr.attr,
  	&sensor_dev_attr_in1_alarm.dev_attr.attr,
  	&sensor_dev_attr_in2_alarm.dev_attr.attr,
  	&sensor_dev_attr_in3_alarm.dev_attr.attr,
  	&sensor_dev_attr_in4_alarm.dev_attr.attr,
  	&sensor_dev_attr_in5_alarm.dev_attr.attr,
  	&sensor_dev_attr_in6_alarm.dev_attr.attr,
  	&sensor_dev_attr_in7_alarm.dev_attr.attr,

  
  	&sensor_dev_attr_temp1_input.dev_attr.attr,
  	&sensor_dev_attr_temp2_input.dev_attr.attr,
  	&sensor_dev_attr_temp3_input.dev_attr.attr,
  	&sensor_dev_attr_temp1_max.dev_attr.attr,
  	&sensor_dev_attr_temp2_max.dev_attr.attr,
  	&sensor_dev_attr_temp3_max.dev_attr.attr,
  	&sensor_dev_attr_temp1_min.dev_attr.attr,
  	&sensor_dev_attr_temp2_min.dev_attr.attr,
  	&sensor_dev_attr_temp3_min.dev_attr.attr,
  	&sensor_dev_attr_temp1_type.dev_attr.attr,
  	&sensor_dev_attr_temp2_type.dev_attr.attr,
  	&sensor_dev_attr_temp3_type.dev_attr.attr,

  	&sensor_dev_attr_temp1_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp2_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp3_alarm.dev_attr.attr,

  
  	&dev_attr_alarms.attr,

  	&sensor_dev_attr_intrusion0_alarm.dev_attr.attr,

  	&dev_attr_name.attr,

  	NULL
  };
  
  static const struct attribute_group it87_group = {
  	.attrs = it87_attributes,
  };

  static struct attribute *it87_attributes_beep[] = {
  	&sensor_dev_attr_in0_beep.dev_attr.attr,
  	&sensor_dev_attr_in1_beep.dev_attr.attr,
  	&sensor_dev_attr_in2_beep.dev_attr.attr,
  	&sensor_dev_attr_in3_beep.dev_attr.attr,
  	&sensor_dev_attr_in4_beep.dev_attr.attr,
  	&sensor_dev_attr_in5_beep.dev_attr.attr,
  	&sensor_dev_attr_in6_beep.dev_attr.attr,
  	&sensor_dev_attr_in7_beep.dev_attr.attr,
  
  	&sensor_dev_attr_temp1_beep.dev_attr.attr,
  	&sensor_dev_attr_temp2_beep.dev_attr.attr,
  	&sensor_dev_attr_temp3_beep.dev_attr.attr,
  	NULL
  };
  
  static const struct attribute_group it87_group_beep = {
  	.attrs = it87_attributes_beep,
  };

  static struct attribute *it87_attributes_fan16[5][3+1] = { {

  	&sensor_dev_attr_fan1_input16.dev_attr.attr,
  	&sensor_dev_attr_fan1_min16.dev_attr.attr,

  	&sensor_dev_attr_fan1_alarm.dev_attr.attr,
  	NULL
  }, {

  	&sensor_dev_attr_fan2_input16.dev_attr.attr,
  	&sensor_dev_attr_fan2_min16.dev_attr.attr,

  	&sensor_dev_attr_fan2_alarm.dev_attr.attr,
  	NULL
  }, {

  	&sensor_dev_attr_fan3_input16.dev_attr.attr,
  	&sensor_dev_attr_fan3_min16.dev_attr.attr,

  	&sensor_dev_attr_fan3_alarm.dev_attr.attr,
  	NULL
  }, {

  	&sensor_dev_attr_fan4_input16.dev_attr.attr,
  	&sensor_dev_attr_fan4_min16.dev_attr.attr,

  	&sensor_dev_attr_fan4_alarm.dev_attr.attr,
  	NULL
  }, {

  	&sensor_dev_attr_fan5_input16.dev_attr.attr,
  	&sensor_dev_attr_fan5_min16.dev_attr.attr,

  	&sensor_dev_attr_fan5_alarm.dev_attr.attr,
  	NULL
  } };
  
  static const struct attribute_group it87_group_fan16[5] = {
  	{ .attrs = it87_attributes_fan16[0] },
  	{ .attrs = it87_attributes_fan16[1] },
  	{ .attrs = it87_attributes_fan16[2] },
  	{ .attrs = it87_attributes_fan16[3] },
  	{ .attrs = it87_attributes_fan16[4] },
  };

  static struct attribute *it87_attributes_fan[3][4+1] = { {

  	&sensor_dev_attr_fan1_input.dev_attr.attr,
  	&sensor_dev_attr_fan1_min.dev_attr.attr,
  	&sensor_dev_attr_fan1_div.dev_attr.attr,

  	&sensor_dev_attr_fan1_alarm.dev_attr.attr,
  	NULL
  }, {

  	&sensor_dev_attr_fan2_input.dev_attr.attr,
  	&sensor_dev_attr_fan2_min.dev_attr.attr,
  	&sensor_dev_attr_fan2_div.dev_attr.attr,

  	&sensor_dev_attr_fan2_alarm.dev_attr.attr,
  	NULL
  }, {

  	&sensor_dev_attr_fan3_input.dev_attr.attr,
  	&sensor_dev_attr_fan3_min.dev_attr.attr,
  	&sensor_dev_attr_fan3_div.dev_attr.attr,

  	&sensor_dev_attr_fan3_alarm.dev_attr.attr,

  	NULL
  } };
  
  static const struct attribute_group it87_group_fan[3] = {
  	{ .attrs = it87_attributes_fan[0] },
  	{ .attrs = it87_attributes_fan[1] },
  	{ .attrs = it87_attributes_fan[2] },
  };
  
  static const struct attribute_group *
  it87_get_fan_group(const struct it87_data *data)
  {
  	return has_16bit_fans(data) ? it87_group_fan16 : it87_group_fan;
  }

  static struct attribute *it87_attributes_pwm[3][4+1] = { {

  	&sensor_dev_attr_pwm1_enable.dev_attr.attr,

  	&sensor_dev_attr_pwm1.dev_attr.attr,

  	&dev_attr_pwm1_freq.attr,

  	&sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr,

  	NULL
  }, {
  	&sensor_dev_attr_pwm2_enable.dev_attr.attr,
  	&sensor_dev_attr_pwm2.dev_attr.attr,
  	&dev_attr_pwm2_freq.attr,

  	&sensor_dev_attr_pwm2_auto_channels_temp.dev_attr.attr,

  	NULL
  }, {
  	&sensor_dev_attr_pwm3_enable.dev_attr.attr,
  	&sensor_dev_attr_pwm3.dev_attr.attr,
  	&dev_attr_pwm3_freq.attr,

  	&sensor_dev_attr_pwm3_auto_channels_temp.dev_attr.attr,

  	NULL
  } };

  static const struct attribute_group it87_group_pwm[3] = {
  	{ .attrs = it87_attributes_pwm[0] },
  	{ .attrs = it87_attributes_pwm[1] },
  	{ .attrs = it87_attributes_pwm[2] },
  };

  static struct attribute *it87_attributes_autopwm[3][9+1] = { {
  	&sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
  	&sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
  	&sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
  	&sensor_dev_attr_pwm1_auto_point4_pwm.dev_attr.attr,
  	&sensor_dev_attr_pwm1_auto_point1_temp.dev_attr.attr,
  	&sensor_dev_attr_pwm1_auto_point1_temp_hyst.dev_attr.attr,
  	&sensor_dev_attr_pwm1_auto_point2_temp.dev_attr.attr,
  	&sensor_dev_attr_pwm1_auto_point3_temp.dev_attr.attr,
  	&sensor_dev_attr_pwm1_auto_point4_temp.dev_attr.attr,
  	NULL
  }, {
  	&sensor_dev_attr_pwm2_auto_point1_pwm.dev_attr.attr,
  	&sensor_dev_attr_pwm2_auto_point2_pwm.dev_attr.attr,
  	&sensor_dev_attr_pwm2_auto_point3_pwm.dev_attr.attr,
  	&sensor_dev_attr_pwm2_auto_point4_pwm.dev_attr.attr,
  	&sensor_dev_attr_pwm2_auto_point1_temp.dev_attr.attr,
  	&sensor_dev_attr_pwm2_auto_point1_temp_hyst.dev_attr.attr,
  	&sensor_dev_attr_pwm2_auto_point2_temp.dev_attr.attr,
  	&sensor_dev_attr_pwm2_auto_point3_temp.dev_attr.attr,
  	&sensor_dev_attr_pwm2_auto_point4_temp.dev_attr.attr,
  	NULL
  }, {
  	&sensor_dev_attr_pwm3_auto_point1_pwm.dev_attr.attr,
  	&sensor_dev_attr_pwm3_auto_point2_pwm.dev_attr.attr,
  	&sensor_dev_attr_pwm3_auto_point3_pwm.dev_attr.attr,
  	&sensor_dev_attr_pwm3_auto_point4_pwm.dev_attr.attr,
  	&sensor_dev_attr_pwm3_auto_point1_temp.dev_attr.attr,
  	&sensor_dev_attr_pwm3_auto_point1_temp_hyst.dev_attr.attr,
  	&sensor_dev_attr_pwm3_auto_point2_temp.dev_attr.attr,
  	&sensor_dev_attr_pwm3_auto_point3_temp.dev_attr.attr,
  	&sensor_dev_attr_pwm3_auto_point4_temp.dev_attr.attr,
  	NULL
  } };
  
  static const struct attribute_group it87_group_autopwm[3] = {
  	{ .attrs = it87_attributes_autopwm[0] },
  	{ .attrs = it87_attributes_autopwm[1] },
  	{ .attrs = it87_attributes_autopwm[2] },
  };

  static struct attribute *it87_attributes_fan_beep[] = {
  	&sensor_dev_attr_fan1_beep.dev_attr.attr,
  	&sensor_dev_attr_fan2_beep.dev_attr.attr,
  	&sensor_dev_attr_fan3_beep.dev_attr.attr,
  	&sensor_dev_attr_fan4_beep.dev_attr.attr,
  	&sensor_dev_attr_fan5_beep.dev_attr.attr,
  };

  static struct attribute *it87_attributes_vid[] = {

  	&dev_attr_vrm.attr,
  	&dev_attr_cpu0_vid.attr,
  	NULL
  };

  static const struct attribute_group it87_group_vid = {
  	.attrs = it87_attributes_vid,

  };

  static struct attribute *it87_attributes_label[] = {
  	&sensor_dev_attr_in3_label.dev_attr.attr,
  	&sensor_dev_attr_in7_label.dev_attr.attr,
  	&sensor_dev_attr_in8_label.dev_attr.attr,
  	NULL
  };
  
  static const struct attribute_group it87_group_label = {

  	.attrs = it87_attributes_label,

  };

  /* SuperIO detection - will change isa_address if a chip is found */

  static int __init it87_find(unsigned short *address,
  	struct it87_sio_data *sio_data)

  {

  	int err;

  	u16 chip_type;

  	const char *board_vendor, *board_name;

  	err = superio_enter();
  	if (err)
  		return err;
  
  	err = -ENODEV;

  	chip_type = force_id ? force_id : superio_inw(DEVID);

  
  	switch (chip_type) {
  	case IT8705F_DEVID:
  		sio_data->type = it87;
  		break;
  	case IT8712F_DEVID:
  		sio_data->type = it8712;
  		break;
  	case IT8716F_DEVID:
  	case IT8726F_DEVID:
  		sio_data->type = it8716;
  		break;
  	case IT8718F_DEVID:
  		sio_data->type = it8718;
  		break;

  	case IT8720F_DEVID:
  		sio_data->type = it8720;
  		break;

  	case IT8721F_DEVID:
  		sio_data->type = it8721;
  		break;

  	case 0xffff:	/* No device at all */
  		goto exit;
  	default:

  		pr_debug("Unsupported chip (DEVID=0x%x)
  ", chip_type);

  		goto exit;
  	}

  	superio_select(PME);

  	if (!(superio_inb(IT87_ACT_REG) & 0x01)) {

  		pr_info("Device not activated, skipping
  ");

  		goto exit;
  	}
  
  	*address = superio_inw(IT87_BASE_REG) & ~(IT87_EXTENT - 1);
  	if (*address == 0) {

  		pr_info("Base address not set, skipping
  ");

  		goto exit;
  	}
  
  	err = 0;

  	sio_data->revision = superio_inb(DEVREV) & 0x0f;

  	pr_info("Found IT%04xF chip at 0x%x, revision %d
  ",

  		chip_type, *address, sio_data->revision);

  	/* in8 (Vbat) is always internal */
  	sio_data->internal = (1 << 2);

  	/* Read GPIO config and VID value from LDN 7 (GPIO) */

  	if (sio_data->type == it87) {
  		/* The IT8705F doesn't have VID pins at all */
  		sio_data->skip_vid = 1;

  
  		/* The IT8705F has a different LD number for GPIO */
  		superio_select(5);
  		sio_data->beep_pin = superio_inb(IT87_SIO_BEEP_PIN_REG) & 0x3f;

  	} else {

  		int reg;
  
  		superio_select(GPIO);

  		reg = superio_inb(IT87_SIO_GPIO3_REG);

  		if (sio_data->type == it8721) {
  			/* The IT8721F/IT8758E doesn't have VID pins at all */

  			sio_data->skip_vid = 1;

  		} else {
  			/* We need at least 4 VID pins */
  			if (reg & 0x0f) {

  				pr_info("VID is disabled (pins used for GPIO)
  ");

  				sio_data->skip_vid = 1;
  			}

  		}

  		/* Check if fan3 is there or not */
  		if (reg & (1 << 6))
  			sio_data->skip_pwm |= (1 << 2);
  		if (reg & (1 << 7))
  			sio_data->skip_fan |= (1 << 2);
  
  		/* Check if fan2 is there or not */
  		reg = superio_inb(IT87_SIO_GPIO5_REG);
  		if (reg & (1 << 1))
  			sio_data->skip_pwm |= (1 << 1);
  		if (reg & (1 << 2))
  			sio_data->skip_fan |= (1 << 1);

  		if ((sio_data->type == it8718 || sio_data->type == it8720)
  		 && !(sio_data->skip_vid))

  			sio_data->vid_value = superio_inb(IT87_SIO_VID_REG);

  
  		reg = superio_inb(IT87_SIO_PINX2_REG);

  		/*
  		 * The IT8720F has no VIN7 pin, so VCCH should always be
  		 * routed internally to VIN7 with an internal divider.
  		 * Curiously, there still is a configuration bit to control
  		 * this, which means it can be set incorrectly. And even
  		 * more curiously, many boards out there are improperly
  		 * configured, even though the IT8720F datasheet claims
  		 * that the internal routing of VCCH to VIN7 is the default
  		 * setting. So we force the internal routing in this case.
  		 */
  		if (sio_data->type == it8720 && !(reg & (1 << 1))) {
  			reg |= (1 << 1);
  			superio_outb(IT87_SIO_PINX2_REG, reg);

  			pr_notice("Routing internal VCCH to in7
  ");

  		}

  		if (reg & (1 << 0))

  			sio_data->internal |= (1 << 0);

  		if ((reg & (1 << 1)) || sio_data->type == it8721)

  			sio_data->internal |= (1 << 1);

  
  		sio_data->beep_pin = superio_inb(IT87_SIO_BEEP_PIN_REG) & 0x3f;

  	}

  	if (sio_data->beep_pin)

  		pr_info("Beeping is supported
  ");

  	/* Disable specific features based on DMI strings */
  	board_vendor = dmi_get_system_info(DMI_BOARD_VENDOR);
  	board_name = dmi_get_system_info(DMI_BOARD_NAME);
  	if (board_vendor && board_name) {
  		if (strcmp(board_vendor, "nVIDIA") == 0
  		 && strcmp(board_name, "FN68PT") == 0) {
  			/* On the Shuttle SN68PT, FAN_CTL2 is apparently not
  			   connected to a fan, but to something else. One user
  			   has reported instant system power-off when changing
  			   the PWM2 duty cycle, so we disable it.
  			   I use the board name string as the trigger in case
  			   the same board is ever used in other systems. */

  			pr_info("Disabling pwm2 due to hardware constraints
  ");

  			sio_data->skip_pwm = (1 << 1);
  		}
  	}

  exit:
  	superio_exit();
  	return err;
  }

  static void it87_remove_files(struct device *dev)
  {
  	struct it87_data *data = platform_get_drvdata(pdev);
  	struct it87_sio_data *sio_data = dev->platform_data;
  	const struct attribute_group *fan_group = it87_get_fan_group(data);
  	int i;
  
  	sysfs_remove_group(&dev->kobj, &it87_group);

  	if (sio_data->beep_pin)
  		sysfs_remove_group(&dev->kobj, &it87_group_beep);

  	for (i = 0; i < 5; i++) {
  		if (!(data->has_fan & (1 << i)))
  			continue;
  		sysfs_remove_group(&dev->kobj, &fan_group[i]);

  		if (sio_data->beep_pin)
  			sysfs_remove_file(&dev->kobj,
  					  it87_attributes_fan_beep[i]);

  	}
  	for (i = 0; i < 3; i++) {
  		if (sio_data->skip_pwm & (1 << 0))
  			continue;
  		sysfs_remove_group(&dev->kobj, &it87_group_pwm[i]);

  		if (has_old_autopwm(data))
  			sysfs_remove_group(&dev->kobj,
  					   &it87_group_autopwm[i]);

  	}

  	if (!sio_data->skip_vid)
  		sysfs_remove_group(&dev->kobj, &it87_group_vid);

  	sysfs_remove_group(&dev->kobj, &it87_group_label);

  }

  static int __devinit it87_probe(struct platform_device *pdev)

  {

  	struct it87_data *data;

  	struct resource *res;
  	struct device *dev = &pdev->dev;
  	struct it87_sio_data *sio_data = dev->platform_data;

  	const struct attribute_group *fan_group;
  	int err = 0, i;

  	int enable_pwm_interface;

  	int fan_beep_need_rw;

  	static const char *names[] = {
  		"it87",
  		"it8712",
  		"it8716",
  		"it8718",

  		"it8720",

  		"it8721",

  	};
  
  	res = platform_get_resource(pdev, IORESOURCE_IO, 0);

  	if (!request_region(res->start, IT87_EC_EXTENT, DRVNAME)) {

  		dev_err(dev, "Failed to request region 0x%lx-0x%lx
  ",
  			(unsigned long)res->start,

  			(unsigned long)(res->start + IT87_EC_EXTENT - 1));

  		err = -EBUSY;
  		goto ERROR0;
  	}

  	data = kzalloc(sizeof(struct it87_data), GFP_KERNEL);
  	if (!data) {

  		err = -ENOMEM;
  		goto ERROR1;
  	}

  	data->addr = res->start;
  	data->type = sio_data->type;

  	data->revision = sio_data->revision;

  	data->name = names[sio_data->type];

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

  	if ((it87_read_value(data, IT87_REG_CONFIG) & 0x80)
  	 || it87_read_value(data, IT87_REG_CHIPID) != 0x90) {

  		err = -ENODEV;
  		goto ERROR2;

  	}

  	platform_set_drvdata(pdev, data);

  	mutex_init(&data->update_lock);

  	/* Check PWM configuration */

  	enable_pwm_interface = it87_check_pwm(dev);

  	/* Starting with IT8721F, we handle scaling of internal voltages */
  	if (data->type == it8721) {
  		if (sio_data->internal & (1 << 0))
  			data->in_scaled |= (1 << 3);	/* in3 is AVCC */
  		if (sio_data->internal & (1 << 1))
  			data->in_scaled |= (1 << 7);	/* in7 is VSB */
  		if (sio_data->internal & (1 << 2))
  			data->in_scaled |= (1 << 8);	/* in8 is Vbat */
  	}

  	/* Initialize the IT87 chip */

  	it87_init_device(pdev);

  
  	/* Register sysfs hooks */

  	err = sysfs_create_group(&dev->kobj, &it87_group);
  	if (err)

  		goto ERROR2;

  	if (sio_data->beep_pin) {
  		err = sysfs_create_group(&dev->kobj, &it87_group_beep);
  		if (err)
  			goto ERROR4;
  	}

  	/* Do not create fan files for disabled fans */

  	fan_group = it87_get_fan_group(data);

  	fan_beep_need_rw = 1;

  	for (i = 0; i < 5; i++) {
  		if (!(data->has_fan & (1 << i)))
  			continue;
  		err = sysfs_create_group(&dev->kobj, &fan_group[i]);
  		if (err)
  			goto ERROR4;

  
  		if (sio_data->beep_pin) {
  			err = sysfs_create_file(&dev->kobj,
  						it87_attributes_fan_beep[i]);
  			if (err)
  				goto ERROR4;
  			if (!fan_beep_need_rw)
  				continue;
  
  			/* As we have a single beep enable bit for all fans,
  			 * only the first enabled fan has a writable attribute
  			 * for it. */
  			if (sysfs_chmod_file(&dev->kobj,
  					     it87_attributes_fan_beep[i],
  					     S_IRUGO | S_IWUSR))
  				dev_dbg(dev, "chmod +w fan%d_beep failed
  ",
  					i + 1);
  			fan_beep_need_rw = 0;
  		}

  	}

  	if (enable_pwm_interface) {

  		for (i = 0; i < 3; i++) {
  			if (sio_data->skip_pwm & (1 << i))
  				continue;
  			err = sysfs_create_group(&dev->kobj,
  						 &it87_group_pwm[i]);
  			if (err)

  				goto ERROR4;

  
  			if (!has_old_autopwm(data))
  				continue;
  			err = sysfs_create_group(&dev->kobj,
  						 &it87_group_autopwm[i]);
  			if (err)
  				goto ERROR4;

  		}

  	}

  	if (!sio_data->skip_vid) {

  		data->vrm = vid_which_vrm();

  		/* VID reading from Super-I/O config space if available */

  		data->vid = sio_data->vid_value;

  		err = sysfs_create_group(&dev->kobj, &it87_group_vid);
  		if (err)

  			goto ERROR4;
  	}

  	/* Export labels for internal sensors */
  	for (i = 0; i < 3; i++) {
  		if (!(sio_data->internal & (1 << i)))
  			continue;
  		err = sysfs_create_file(&dev->kobj,
  					it87_attributes_label[i]);
  		if (err)
  			goto ERROR4;
  	}

  	data->hwmon_dev = hwmon_device_register(dev);
  	if (IS_ERR(data->hwmon_dev)) {
  		err = PTR_ERR(data->hwmon_dev);

  		goto ERROR4;

  	}
  
  	return 0;

  ERROR4:

  	it87_remove_files(dev);

  ERROR2:

  	platform_set_drvdata(pdev, NULL);

  	kfree(data);
  ERROR1:

  	release_region(res->start, IT87_EC_EXTENT);

  ERROR0:
  	return err;
  }

  static int __devexit it87_remove(struct platform_device *pdev)

  {

  	struct it87_data *data = platform_get_drvdata(pdev);

  	hwmon_device_unregister(data->hwmon_dev);

  	it87_remove_files(&pdev->dev);