// SPDX-License-Identifier: GPL-2.0-only

  /*

   * w83793.c - Linux kernel driver for hardware monitoring
   * Copyright (C) 2006 Winbond Electronics Corp.
   *	      Yuan Mu
   *	      Rudolf Marek <r.marek@assembler.cz>
   * Copyright (C) 2009-2010 Sven Anders <anders@anduras.de>, ANDURAS AG.
   *		Watchdog driver part
   *		(Based partially on fschmd driver,
   *		 Copyright 2007-2008 by Hans de Goede)

   */

  
  /*

   * Supports following chips:
   *
   * Chip	#vin	#fanin	#pwm	#temp	wchipid	vendid	i2c	ISA
   * w83793	10	12	8	6	0x7b	0x5ca3	yes	no
   */

  
  #include <linux/module.h>
  #include <linux/init.h>
  #include <linux/slab.h>
  #include <linux/i2c.h>
  #include <linux/hwmon.h>
  #include <linux/hwmon-vid.h>
  #include <linux/hwmon-sysfs.h>
  #include <linux/err.h>
  #include <linux/mutex.h>

  #include <linux/fs.h>
  #include <linux/watchdog.h>
  #include <linux/miscdevice.h>
  #include <linux/uaccess.h>
  #include <linux/kref.h>
  #include <linux/notifier.h>
  #include <linux/reboot.h>

  #include <linux/jiffies.h>

  
  /* Default values */
  #define WATCHDOG_TIMEOUT 2	/* 2 minute default timeout */

  
  /* Addresses to scan */

  static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
  						I2C_CLIENT_END };

  
  /* Insmod parameters */

  
  static unsigned short force_subclients[4];
  module_param_array(force_subclients, short, NULL, 0);

  MODULE_PARM_DESC(force_subclients,
  		 "List of subclient addresses: {bus, clientaddr, subclientaddr1, subclientaddr2}");

  static bool reset;

  module_param(reset, bool, 0);
  MODULE_PARM_DESC(reset, "Set to 1 to reset chip, not recommended");

  static int timeout = WATCHDOG_TIMEOUT;	/* default timeout in minutes */
  module_param(timeout, int, 0);
  MODULE_PARM_DESC(timeout,
  	"Watchdog timeout in minutes. 2<= timeout <=255 (default="
  				__MODULE_STRING(WATCHDOG_TIMEOUT) ")");

  static bool nowayout = WATCHDOG_NOWAYOUT;
  module_param(nowayout, bool, 0);

  MODULE_PARM_DESC(nowayout,
  	"Watchdog cannot be stopped once started (default="
  				__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");

  /*

   * Address 0x00, 0x0d, 0x0e, 0x0f in all three banks are reserved
   * as ID, Bank Select registers
   */

  #define W83793_REG_BANKSEL		0x00
  #define W83793_REG_VENDORID		0x0d
  #define W83793_REG_CHIPID		0x0e
  #define W83793_REG_DEVICEID		0x0f
  
  #define W83793_REG_CONFIG		0x40
  #define W83793_REG_MFC			0x58
  #define W83793_REG_FANIN_CTRL		0x5c
  #define W83793_REG_FANIN_SEL		0x5d
  #define W83793_REG_I2C_ADDR		0x0b
  #define W83793_REG_I2C_SUBADDR		0x0c
  #define W83793_REG_VID_INA		0x05
  #define W83793_REG_VID_INB		0x06
  #define W83793_REG_VID_LATCHA		0x07
  #define W83793_REG_VID_LATCHB		0x08
  #define W83793_REG_VID_CTRL		0x59

  #define W83793_REG_WDT_LOCK		0x01
  #define W83793_REG_WDT_ENABLE		0x02
  #define W83793_REG_WDT_STATUS		0x03
  #define W83793_REG_WDT_TIMEOUT		0x04

  static u16 W83793_REG_TEMP_MODE[2] = { 0x5e, 0x5f };
  
  #define TEMP_READ	0
  #define TEMP_CRIT	1
  #define TEMP_CRIT_HYST	2
  #define TEMP_WARN	3
  #define TEMP_WARN_HYST	4

  /*
   * only crit and crit_hyst affect real-time alarm status
   * current crit crit_hyst warn warn_hyst
   */

  static u16 W83793_REG_TEMP[][5] = {
  	{0x1c, 0x78, 0x79, 0x7a, 0x7b},
  	{0x1d, 0x7c, 0x7d, 0x7e, 0x7f},
  	{0x1e, 0x80, 0x81, 0x82, 0x83},
  	{0x1f, 0x84, 0x85, 0x86, 0x87},
  	{0x20, 0x88, 0x89, 0x8a, 0x8b},
  	{0x21, 0x8c, 0x8d, 0x8e, 0x8f},
  };
  
  #define W83793_REG_TEMP_LOW_BITS	0x22
  
  #define W83793_REG_BEEP(index)		(0x53 + (index))
  #define W83793_REG_ALARM(index)		(0x4b + (index))
  
  #define W83793_REG_CLR_CHASSIS		0x4a	/* SMI MASK4 */
  #define W83793_REG_IRQ_CTRL		0x50
  #define W83793_REG_OVT_CTRL		0x51
  #define W83793_REG_OVT_BEEP		0x52
  
  #define IN_READ				0
  #define IN_MAX				1
  #define IN_LOW				2
  static const u16 W83793_REG_IN[][3] = {
  	/* Current, High, Low */
  	{0x10, 0x60, 0x61},	/* Vcore A	*/
  	{0x11, 0x62, 0x63},	/* Vcore B	*/
  	{0x12, 0x64, 0x65},	/* Vtt		*/
  	{0x14, 0x6a, 0x6b},	/* VSEN1	*/
  	{0x15, 0x6c, 0x6d},	/* VSEN2	*/
  	{0x16, 0x6e, 0x6f},	/* +3VSEN	*/
  	{0x17, 0x70, 0x71},	/* +12VSEN	*/
  	{0x18, 0x72, 0x73},	/* 5VDD		*/
  	{0x19, 0x74, 0x75},	/* 5VSB		*/
  	{0x1a, 0x76, 0x77},	/* VBAT		*/
  };
  
  /* Low Bits of Vcore A/B Vtt Read/High/Low */
  static const u16 W83793_REG_IN_LOW_BITS[] = { 0x1b, 0x68, 0x69 };
  static u8 scale_in[] = { 2, 2, 2, 16, 16, 16, 8, 24, 24, 16 };

  static u8 scale_in_add[] = { 0, 0, 0, 0, 0, 0, 0, 150, 150, 0 };

  
  #define W83793_REG_FAN(index)		(0x23 + 2 * (index))	/* High byte */
  #define W83793_REG_FAN_MIN(index)	(0x90 + 2 * (index))	/* High byte */
  
  #define W83793_REG_PWM_DEFAULT		0xb2
  #define W83793_REG_PWM_ENABLE		0x207
  #define W83793_REG_PWM_UPTIME		0xc3	/* Unit in 0.1 second */
  #define W83793_REG_PWM_DOWNTIME		0xc4	/* Unit in 0.1 second */
  #define W83793_REG_TEMP_CRITICAL	0xc5
  
  #define PWM_DUTY			0
  #define PWM_START			1
  #define PWM_NONSTOP			2

  #define PWM_STOP_TIME			3

  #define W83793_REG_PWM(index, nr)	(((nr) == 0 ? 0xb3 : \
  					 (nr) == 1 ? 0x220 : 0x218) + (index))
  
  /* bit field, fan1 is bit0, fan2 is bit1 ... */
  #define W83793_REG_TEMP_FAN_MAP(index)	(0x201 + (index))
  #define W83793_REG_TEMP_TOL(index)	(0x208 + (index))
  #define W83793_REG_TEMP_CRUISE(index)	(0x210 + (index))
  #define W83793_REG_PWM_STOP_TIME(index)	(0x228 + (index))
  #define W83793_REG_SF2_TEMP(index, nr)	(0x230 + ((index) << 4) + (nr))
  #define W83793_REG_SF2_PWM(index, nr)	(0x238 + ((index) << 4) + (nr))
  
  static inline unsigned long FAN_FROM_REG(u16 val)
  {
  	if ((val >= 0xfff) || (val == 0))
  		return	0;

  	return 1350000UL / val;

  }
  
  static inline u16 FAN_TO_REG(long rpm)
  {
  	if (rpm <= 0)
  		return 0x0fff;

  	return clamp_val((1350000 + (rpm >> 1)) / rpm, 1, 0xffe);

  }
  
  static inline unsigned long TIME_FROM_REG(u8 reg)
  {

  	return reg * 100;

  }
  
  static inline u8 TIME_TO_REG(unsigned long val)
  {

  	return clamp_val((val + 50) / 100, 0, 0xff);

  }
  
  static inline long TEMP_FROM_REG(s8 reg)
  {

  	return reg * 1000;

  }
  
  static inline s8 TEMP_TO_REG(long val, s8 min, s8 max)
  {

  	return clamp_val((val + (val < 0 ? -500 : 500)) / 1000, min, max);

  }
  
  struct w83793_data {

  	struct i2c_client *lm75[2];

  	struct device *hwmon_dev;

  	struct mutex update_lock;
  	char valid;			/* !=0 if following fields are valid */
  	unsigned long last_updated;	/* In jiffies */
  	unsigned long last_nonvolatile;	/* In jiffies, last time we update the

  					 * nonvolatile registers
  					 */

  
  	u8 bank;
  	u8 vrm;
  	u8 vid[2];
  	u8 in[10][3];		/* Register value, read/high/low */
  	u8 in_low_bits[3];	/* Additional resolution for VCore A/B Vtt */
  
  	u16 has_fan;		/* Only fan1- fan5 has own pins */
  	u16 fan[12];		/* Register value combine */
  	u16 fan_min[12];	/* Register value combine */
  
  	s8 temp[6][5];		/* current, crit, crit_hyst,warn, warn_hyst */
  	u8 temp_low_bits;	/* Additional resolution TD1-TD4 */
  	u8 temp_mode[2];	/* byte 0: Temp D1-D4 mode each has 2 bits

  				 * byte 1: Temp R1,R2 mode, each has 1 bit
  				 */

  	u8 temp_critical;	/* If reached all fan will be at full speed */
  	u8 temp_fan_map[6];	/* Temp controls which pwm fan, bit field */
  
  	u8 has_pwm;

  	u8 has_temp;

  	u8 has_vid;

  	u8 pwm_enable;		/* Register value, each Temp has 1 bit */
  	u8 pwm_uptime;		/* Register value */
  	u8 pwm_downtime;	/* Register value */
  	u8 pwm_default;		/* All fan default pwm, next poweron valid */
  	u8 pwm[8][3];		/* Register value */
  	u8 pwm_stop_time[8];
  	u8 temp_cruise[6];
  
  	u8 alarms[5];		/* realtime status registers */
  	u8 beeps[5];
  	u8 beep_enable;
  	u8 tolerance[3];	/* Temp tolerance(Smart Fan I/II) */
  	u8 sf2_pwm[6][7];	/* Smart FanII: Fan duty cycle */
  	u8 sf2_temp[6][7];	/* Smart FanII: Temp level point */

  
  	/* watchdog */
  	struct i2c_client *client;
  	struct mutex watchdog_lock;
  	struct list_head list; /* member of the watchdog_data_list */
  	struct kref kref;
  	struct miscdevice watchdog_miscdev;
  	unsigned long watchdog_is_open;
  	char watchdog_expect_close;
  	char watchdog_name[10]; /* must be unique to avoid sysfs conflict */
  	unsigned int watchdog_caused_reboot;
  	int watchdog_timeout; /* watchdog timeout in minutes */

  };

  /*
   * Somewhat ugly :( global data pointer list with all devices, so that
   * we can find our device data as when using misc_register. There is no
   * other method to get to one's device data from the open file-op and
   * for usage in the reboot notifier callback.
   */

  static LIST_HEAD(watchdog_data_list);
  
  /* Note this lock not only protect list access, but also data.kref access */
  static DEFINE_MUTEX(watchdog_data_mutex);

  /*
   * Release our data struct when we're detached from the i2c client *and* all
   * references to our watchdog device are released
   */

  static void w83793_release_resources(struct kref *ref)
  {
  	struct w83793_data *data = container_of(ref, struct w83793_data, kref);
  	kfree(data);
  }

  static u8 w83793_read_value(struct i2c_client *client, u16 reg);
  static int w83793_write_value(struct i2c_client *client, u16 reg, u8 value);

  static int w83793_probe(struct i2c_client *client);

  static int w83793_detect(struct i2c_client *client,

  			 struct i2c_board_info *info);
  static int w83793_remove(struct i2c_client *client);

  static void w83793_init_client(struct i2c_client *client);
  static void w83793_update_nonvolatile(struct device *dev);
  static struct w83793_data *w83793_update_device(struct device *dev);

  static const struct i2c_device_id w83793_id[] = {

  	{ "w83793", 0 },

  	{ }
  };
  MODULE_DEVICE_TABLE(i2c, w83793_id);

  static struct i2c_driver w83793_driver = {

  	.class		= I2C_CLASS_HWMON,

  	.driver = {
  		   .name = "w83793",
  	},

  	.probe_new	= w83793_probe,

  	.remove		= w83793_remove,
  	.id_table	= w83793_id,
  	.detect		= w83793_detect,

  	.address_list	= normal_i2c,

  };
  
  static ssize_t

  vrm_show(struct device *dev, struct device_attribute *attr, char *buf)

  {

  	struct w83793_data *data = dev_get_drvdata(dev);

  	return sprintf(buf, "%d
  ", data->vrm);
  }
  
  static ssize_t
  show_vid(struct device *dev, struct device_attribute *attr, char *buf)
  {
  	struct w83793_data *data = w83793_update_device(dev);
  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int index = sensor_attr->index;
  
  	return sprintf(buf, "%d
  ", vid_from_reg(data->vid[index], data->vrm));
  }
  
  static ssize_t

  vrm_store(struct device *dev, struct device_attribute *attr,

  	  const char *buf, size_t count)
  {

  	struct w83793_data *data = dev_get_drvdata(dev);

  	unsigned long val;
  	int err;
  
  	err = kstrtoul(buf, 10, &val);
  	if (err)
  		return err;

  	if (val > 255)
  		return -EINVAL;

  	data->vrm = val;

  	return count;
  }
  
  #define ALARM_STATUS			0
  #define BEEP_ENABLE			1
  static ssize_t
  show_alarm_beep(struct device *dev, struct device_attribute *attr, char *buf)
  {
  	struct w83793_data *data = w83793_update_device(dev);
  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int nr = sensor_attr->nr;
  	int index = sensor_attr->index >> 3;
  	int bit = sensor_attr->index & 0x07;
  	u8 val;

  	if (nr == ALARM_STATUS) {

  		val = (data->alarms[index] >> (bit)) & 1;
  	} else {		/* BEEP_ENABLE */
  		val = (data->beeps[index] >> (bit)) & 1;
  	}
  
  	return sprintf(buf, "%u
  ", val);
  }
  
  static ssize_t
  store_beep(struct device *dev, struct device_attribute *attr,
  	   const char *buf, size_t count)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct w83793_data *data = i2c_get_clientdata(client);
  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int index = sensor_attr->index >> 3;
  	int shift = sensor_attr->index & 0x07;
  	u8 beep_bit = 1 << shift;

  	unsigned long val;
  	int err;

  	err = kstrtoul(buf, 10, &val);
  	if (err)
  		return err;
  
  	if (val > 1)

  		return -EINVAL;
  
  	mutex_lock(&data->update_lock);
  	data->beeps[index] = w83793_read_value(client, W83793_REG_BEEP(index));
  	data->beeps[index] &= ~beep_bit;
  	data->beeps[index] |= val << shift;
  	w83793_write_value(client, W83793_REG_BEEP(index), data->beeps[index]);
  	mutex_unlock(&data->update_lock);
  
  	return count;
  }
  
  static ssize_t
  show_beep_enable(struct device *dev, struct device_attribute *attr, char *buf)
  {
  	struct w83793_data *data = w83793_update_device(dev);
  	return sprintf(buf, "%u
  ", (data->beep_enable >> 1) & 0x01);
  }
  
  static ssize_t
  store_beep_enable(struct device *dev, struct device_attribute *attr,
  		  const char *buf, size_t count)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct w83793_data *data = i2c_get_clientdata(client);

  	unsigned long val;
  	int err;
  
  	err = kstrtoul(buf, 10, &val);
  	if (err)
  		return err;

  	if (val > 1)

  		return -EINVAL;
  
  	mutex_lock(&data->update_lock);
  	data->beep_enable = w83793_read_value(client, W83793_REG_OVT_BEEP)
  			    & 0xfd;
  	data->beep_enable |= val << 1;
  	w83793_write_value(client, W83793_REG_OVT_BEEP, data->beep_enable);
  	mutex_unlock(&data->update_lock);
  
  	return count;
  }

  /* Write 0 to clear chassis alarm */
  static ssize_t
  store_chassis_clear(struct device *dev,
  		    struct device_attribute *attr, const char *buf,
  		    size_t count)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct w83793_data *data = i2c_get_clientdata(client);
  	unsigned long val;
  	u8 reg;

  	int err;

  	err = kstrtoul(buf, 10, &val);
  	if (err)
  		return err;
  	if (val)

  		return -EINVAL;
  
  	mutex_lock(&data->update_lock);
  	reg = w83793_read_value(client, W83793_REG_CLR_CHASSIS);
  	w83793_write_value(client, W83793_REG_CLR_CHASSIS, reg | 0x80);
  	data->valid = 0;		/* Force cache refresh */
  	mutex_unlock(&data->update_lock);
  	return count;
  }

  #define FAN_INPUT			0
  #define FAN_MIN				1
  static ssize_t
  show_fan(struct device *dev, struct device_attribute *attr, char *buf)
  {
  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int nr = sensor_attr->nr;
  	int index = sensor_attr->index;
  	struct w83793_data *data = w83793_update_device(dev);
  	u16 val;

  	if (nr == FAN_INPUT)

  		val = data->fan[index] & 0x0fff;

  	else

  		val = data->fan_min[index] & 0x0fff;

  
  	return sprintf(buf, "%lu
  ", FAN_FROM_REG(val));
  }
  
  static ssize_t
  store_fan_min(struct device *dev, struct device_attribute *attr,
  	      const char *buf, size_t count)
  {
  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int index = sensor_attr->index;
  	struct i2c_client *client = to_i2c_client(dev);
  	struct w83793_data *data = i2c_get_clientdata(client);

  	unsigned long val;
  	int err;
  
  	err = kstrtoul(buf, 10, &val);
  	if (err)
  		return err;
  	val = FAN_TO_REG(val);

  
  	mutex_lock(&data->update_lock);
  	data->fan_min[index] = val;
  	w83793_write_value(client, W83793_REG_FAN_MIN(index),
  			   (val >> 8) & 0xff);
  	w83793_write_value(client, W83793_REG_FAN_MIN(index) + 1, val & 0xff);
  	mutex_unlock(&data->update_lock);
  
  	return count;
  }

  static ssize_t
  show_pwm(struct device *dev, struct device_attribute *attr, char *buf)
  {
  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	struct w83793_data *data = w83793_update_device(dev);
  	u16 val;
  	int nr = sensor_attr->nr;
  	int index = sensor_attr->index;

  	if (nr == PWM_STOP_TIME)

  		val = TIME_FROM_REG(data->pwm_stop_time[index]);
  	else
  		val = (data->pwm[index][nr] & 0x3f) << 2;
  
  	return sprintf(buf, "%d
  ", val);
  }
  
  static ssize_t
  store_pwm(struct device *dev, struct device_attribute *attr,
  	  const char *buf, size_t count)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct w83793_data *data = i2c_get_clientdata(client);
  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int nr = sensor_attr->nr;
  	int index = sensor_attr->index;

  	unsigned long val;
  	int err;
  
  	err = kstrtoul(buf, 10, &val);
  	if (err)
  		return err;

  
  	mutex_lock(&data->update_lock);

  	if (nr == PWM_STOP_TIME) {
  		val = TIME_TO_REG(val);

  		data->pwm_stop_time[index] = val;
  		w83793_write_value(client, W83793_REG_PWM_STOP_TIME(index),
  				   val);
  	} else {

  		val = clamp_val(val, 0, 0xff) >> 2;

  		data->pwm[index][nr] =
  		    w83793_read_value(client, W83793_REG_PWM(index, nr)) & 0xc0;
  		data->pwm[index][nr] |= val;
  		w83793_write_value(client, W83793_REG_PWM(index, nr),
  							data->pwm[index][nr]);
  	}
  
  	mutex_unlock(&data->update_lock);
  	return count;
  }
  
  static ssize_t
  show_temp(struct device *dev, struct device_attribute *attr, char *buf)
  {
  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int nr = sensor_attr->nr;
  	int index = sensor_attr->index;
  	struct w83793_data *data = w83793_update_device(dev);
  	long temp = TEMP_FROM_REG(data->temp[index][nr]);

  	if (nr == TEMP_READ && index < 4) {	/* Only TD1-TD4 have low bits */

  		int low = ((data->temp_low_bits >> (index * 2)) & 0x03) * 250;
  		temp += temp > 0 ? low : -low;
  	}
  	return sprintf(buf, "%ld
  ", temp);
  }
  
  static ssize_t
  store_temp(struct device *dev, struct device_attribute *attr,
  	   const char *buf, size_t count)
  {
  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int nr = sensor_attr->nr;
  	int index = sensor_attr->index;
  	struct i2c_client *client = to_i2c_client(dev);
  	struct w83793_data *data = i2c_get_clientdata(client);

  	long tmp;
  	int err;
  
  	err = kstrtol(buf, 10, &tmp);
  	if (err)
  		return err;

  
  	mutex_lock(&data->update_lock);
  	data->temp[index][nr] = TEMP_TO_REG(tmp, -128, 127);
  	w83793_write_value(client, W83793_REG_TEMP[index][nr],
  			   data->temp[index][nr]);
  	mutex_unlock(&data->update_lock);
  	return count;
  }
  
  /*

   * TD1-TD4
   * each has 4 mode:(2 bits)
   * 0:	Stop monitor
   * 1:	Use internal temp sensor(default)
   * 2:	Reserved
   * 3:	Use sensor in Intel CPU and get result by PECI
   *
   * TR1-TR2
   * each has 2 mode:(1 bit)
   * 0:	Disable temp sensor monitor
   * 1:	To enable temp sensors monitor
   */

  /* 0 disable, 6 PECI */
  static u8 TO_TEMP_MODE[] = { 0, 0, 0, 6 };

  
  static ssize_t
  show_temp_mode(struct device *dev, struct device_attribute *attr, char *buf)
  {
  	struct w83793_data *data = w83793_update_device(dev);
  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int index = sensor_attr->index;
  	u8 mask = (index < 4) ? 0x03 : 0x01;
  	u8 shift = (index < 4) ? (2 * index) : (index - 4);
  	u8 tmp;
  	index = (index < 4) ? 0 : 1;
  
  	tmp = (data->temp_mode[index] >> shift) & mask;
  
  	/* for the internal sensor, found out if diode or thermistor */

  	if (tmp == 1)

  		tmp = index == 0 ? 3 : 4;

  	else

  		tmp = TO_TEMP_MODE[tmp];

  
  	return sprintf(buf, "%d
  ", tmp);
  }
  
  static ssize_t
  store_temp_mode(struct device *dev, struct device_attribute *attr,
  		const char *buf, size_t count)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct w83793_data *data = i2c_get_clientdata(client);
  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int index = sensor_attr->index;
  	u8 mask = (index < 4) ? 0x03 : 0x01;
  	u8 shift = (index < 4) ? (2 * index) : (index - 4);

  	unsigned long val;
  	int err;
  
  	err = kstrtoul(buf, 10, &val);
  	if (err)
  		return err;

  
  	/* transform the sysfs interface values into table above */

  	if ((val == 6) && (index < 4)) {

  		val -= 3;
  	} else if ((val == 3 && index < 4)

  		|| (val == 4 && index >= 4)) {

  		/* transform diode or thermistor into internal enable */
  		val = !!val;
  	} else {
  		return -EINVAL;
  	}
  
  	index = (index < 4) ? 0 : 1;
  	mutex_lock(&data->update_lock);
  	data->temp_mode[index] =
  	    w83793_read_value(client, W83793_REG_TEMP_MODE[index]);
  	data->temp_mode[index] &= ~(mask << shift);
  	data->temp_mode[index] |= val << shift;
  	w83793_write_value(client, W83793_REG_TEMP_MODE[index],
  							data->temp_mode[index]);
  	mutex_unlock(&data->update_lock);
  
  	return count;
  }
  
  #define SETUP_PWM_DEFAULT		0
  #define SETUP_PWM_UPTIME		1	/* Unit in 0.1s */
  #define SETUP_PWM_DOWNTIME		2	/* Unit in 0.1s */
  #define SETUP_TEMP_CRITICAL		3
  static ssize_t
  show_sf_setup(struct device *dev, struct device_attribute *attr, char *buf)
  {
  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int nr = sensor_attr->nr;
  	struct w83793_data *data = w83793_update_device(dev);
  	u32 val = 0;

  	if (nr == SETUP_PWM_DEFAULT)

  		val = (data->pwm_default & 0x3f) << 2;

  	else if (nr == SETUP_PWM_UPTIME)

  		val = TIME_FROM_REG(data->pwm_uptime);

  	else if (nr == SETUP_PWM_DOWNTIME)

  		val = TIME_FROM_REG(data->pwm_downtime);

  	else if (nr == SETUP_TEMP_CRITICAL)

  		val = TEMP_FROM_REG(data->temp_critical & 0x7f);

  
  	return sprintf(buf, "%d
  ", val);
  }
  
  static ssize_t
  store_sf_setup(struct device *dev, struct device_attribute *attr,
  	       const char *buf, size_t count)
  {
  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int nr = sensor_attr->nr;
  	struct i2c_client *client = to_i2c_client(dev);
  	struct w83793_data *data = i2c_get_clientdata(client);

  	long val;
  	int err;
  
  	err = kstrtol(buf, 10, &val);
  	if (err)
  		return err;

  
  	mutex_lock(&data->update_lock);

  	if (nr == SETUP_PWM_DEFAULT) {

  		data->pwm_default =
  		    w83793_read_value(client, W83793_REG_PWM_DEFAULT) & 0xc0;

  		data->pwm_default |= clamp_val(val, 0, 0xff) >> 2;

  		w83793_write_value(client, W83793_REG_PWM_DEFAULT,
  							data->pwm_default);

  	} else if (nr == SETUP_PWM_UPTIME) {
  		data->pwm_uptime = TIME_TO_REG(val);

  		data->pwm_uptime += data->pwm_uptime == 0 ? 1 : 0;
  		w83793_write_value(client, W83793_REG_PWM_UPTIME,
  							data->pwm_uptime);

  	} else if (nr == SETUP_PWM_DOWNTIME) {
  		data->pwm_downtime = TIME_TO_REG(val);

  		data->pwm_downtime += data->pwm_downtime == 0 ? 1 : 0;
  		w83793_write_value(client, W83793_REG_PWM_DOWNTIME,
  							data->pwm_downtime);
  	} else {		/* SETUP_TEMP_CRITICAL */
  		data->temp_critical =
  		    w83793_read_value(client, W83793_REG_TEMP_CRITICAL) & 0x80;

  		data->temp_critical |= TEMP_TO_REG(val, 0, 0x7f);

  		w83793_write_value(client, W83793_REG_TEMP_CRITICAL,
  							data->temp_critical);
  	}
  
  	mutex_unlock(&data->update_lock);
  	return count;
  }
  
  /*

   * Temp SmartFan control
   * TEMP_FAN_MAP
   * Temp channel control which pwm fan, bitfield, bit 0 indicate pwm1...
   * It's possible two or more temp channels control the same fan, w83793
   * always prefers to pick the most critical request and applies it to
   * the related Fan.
   * It's possible one fan is not in any mapping of 6 temp channels, this
   * means the fan is manual mode
   *
   * TEMP_PWM_ENABLE
   * Each temp channel has its own SmartFan mode, and temp channel
   * control fans that are set by TEMP_FAN_MAP
   * 0:	SmartFanII mode
   * 1:	Thermal Cruise Mode
   *
   * TEMP_CRUISE
   * Target temperature in thermal cruise mode, w83793 will try to turn
   * fan speed to keep the temperature of target device around this
   * temperature.
   *
   * TEMP_TOLERANCE
   * If Temp higher or lower than target with this tolerance, w83793
   * will take actions to speed up or slow down the fan to keep the
   * temperature within the tolerance range.
   */

  
  #define TEMP_FAN_MAP			0
  #define TEMP_PWM_ENABLE			1
  #define TEMP_CRUISE			2
  #define TEMP_TOLERANCE			3
  static ssize_t
  show_sf_ctrl(struct device *dev, struct device_attribute *attr, char *buf)
  {
  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int nr = sensor_attr->nr;
  	int index = sensor_attr->index;
  	struct w83793_data *data = w83793_update_device(dev);
  	u32 val;

  	if (nr == TEMP_FAN_MAP) {

  		val = data->temp_fan_map[index];

  	} else if (nr == TEMP_PWM_ENABLE) {

  		/* +2 to transform into 2 and 3 to conform with sysfs intf */

  		val = ((data->pwm_enable >> index) & 0x01) + 2;

  	} else if (nr == TEMP_CRUISE) {

  		val = TEMP_FROM_REG(data->temp_cruise[index] & 0x7f);
  	} else {		/* TEMP_TOLERANCE */
  		val = data->tolerance[index >> 1] >> ((index & 0x01) ? 4 : 0);
  		val = TEMP_FROM_REG(val & 0x0f);
  	}
  	return sprintf(buf, "%d
  ", val);
  }
  
  static ssize_t
  store_sf_ctrl(struct device *dev, struct device_attribute *attr,
  	      const char *buf, size_t count)
  {
  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int nr = sensor_attr->nr;
  	int index = sensor_attr->index;
  	struct i2c_client *client = to_i2c_client(dev);
  	struct w83793_data *data = i2c_get_clientdata(client);

  	long val;
  	int err;
  
  	err = kstrtol(buf, 10, &val);
  	if (err)
  		return err;

  
  	mutex_lock(&data->update_lock);

  	if (nr == TEMP_FAN_MAP) {

  		val = clamp_val(val, 0, 255);

  		w83793_write_value(client, W83793_REG_TEMP_FAN_MAP(index), val);
  		data->temp_fan_map[index] = val;

  	} else if (nr == TEMP_PWM_ENABLE) {
  		if (val == 2 || val == 3) {

  			data->pwm_enable =
  			    w83793_read_value(client, W83793_REG_PWM_ENABLE);
  			if (val - 2)
  				data->pwm_enable |= 1 << index;
  			else
  				data->pwm_enable &= ~(1 << index);
  			w83793_write_value(client, W83793_REG_PWM_ENABLE,
  							data->pwm_enable);
  		} else {
  			mutex_unlock(&data->update_lock);
  			return -EINVAL;
  		}

  	} else if (nr == TEMP_CRUISE) {

  		data->temp_cruise[index] =
  		    w83793_read_value(client, W83793_REG_TEMP_CRUISE(index));

  		data->temp_cruise[index] &= 0x80;

  		data->temp_cruise[index] |= TEMP_TO_REG(val, 0, 0x7f);

  
  		w83793_write_value(client, W83793_REG_TEMP_CRUISE(index),
  						data->temp_cruise[index]);
  	} else {		/* TEMP_TOLERANCE */
  		int i = index >> 1;
  		u8 shift = (index & 0x01) ? 4 : 0;
  		data->tolerance[i] =
  		    w83793_read_value(client, W83793_REG_TEMP_TOL(i));

  		data->tolerance[i] &= ~(0x0f << shift);

  		data->tolerance[i] |= TEMP_TO_REG(val, 0, 0x0f) << shift;

  		w83793_write_value(client, W83793_REG_TEMP_TOL(i),
  							data->tolerance[i]);
  	}
  
  	mutex_unlock(&data->update_lock);
  	return count;
  }
  
  static ssize_t
  show_sf2_pwm(struct device *dev, struct device_attribute *attr, char *buf)
  {
  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int nr = sensor_attr->nr;
  	int index = sensor_attr->index;
  	struct w83793_data *data = w83793_update_device(dev);
  
  	return sprintf(buf, "%d
  ", (data->sf2_pwm[index][nr] & 0x3f) << 2);
  }
  
  static ssize_t
  store_sf2_pwm(struct device *dev, struct device_attribute *attr,
  	      const char *buf, size_t count)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct w83793_data *data = i2c_get_clientdata(client);
  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int nr = sensor_attr->nr;
  	int index = sensor_attr->index;

  	unsigned long val;
  	int err;
  
  	err = kstrtoul(buf, 10, &val);
  	if (err)
  		return err;

  	val = clamp_val(val, 0, 0xff) >> 2;

  
  	mutex_lock(&data->update_lock);
  	data->sf2_pwm[index][nr] =
  	    w83793_read_value(client, W83793_REG_SF2_PWM(index, nr)) & 0xc0;
  	data->sf2_pwm[index][nr] |= val;
  	w83793_write_value(client, W83793_REG_SF2_PWM(index, nr),
  						data->sf2_pwm[index][nr]);
  	mutex_unlock(&data->update_lock);
  	return count;
  }
  
  static ssize_t
  show_sf2_temp(struct device *dev, struct device_attribute *attr, char *buf)
  {
  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int nr = sensor_attr->nr;
  	int index = sensor_attr->index;
  	struct w83793_data *data = w83793_update_device(dev);
  
  	return sprintf(buf, "%ld
  ",
  		       TEMP_FROM_REG(data->sf2_temp[index][nr] & 0x7f));
  }
  
  static ssize_t
  store_sf2_temp(struct device *dev, struct device_attribute *attr,
  	       const char *buf, size_t count)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct w83793_data *data = i2c_get_clientdata(client);
  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int nr = sensor_attr->nr;
  	int index = sensor_attr->index;

  	long val;
  	int err;
  
  	err = kstrtol(buf, 10, &val);
  	if (err)
  		return err;
  	val = TEMP_TO_REG(val, 0, 0x7f);

  
  	mutex_lock(&data->update_lock);
  	data->sf2_temp[index][nr] =
  	    w83793_read_value(client, W83793_REG_SF2_TEMP(index, nr)) & 0x80;
  	data->sf2_temp[index][nr] |= val;
  	w83793_write_value(client, W83793_REG_SF2_TEMP(index, nr),
  					     data->sf2_temp[index][nr]);
  	mutex_unlock(&data->update_lock);
  	return count;
  }
  
  /* only Vcore A/B and Vtt have additional 2 bits precision */
  static ssize_t
  show_in(struct device *dev, struct device_attribute *attr, char *buf)
  {
  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int nr = sensor_attr->nr;
  	int index = sensor_attr->index;
  	struct w83793_data *data = w83793_update_device(dev);
  	u16 val = data->in[index][nr];
  
  	if (index < 3) {
  		val <<= 2;
  		val += (data->in_low_bits[nr] >> (index * 2)) & 0x3;
  	}

  	/* voltage inputs 5VDD and 5VSB needs 150mV offset */
  	val = val * scale_in[index] + scale_in_add[index];
  	return sprintf(buf, "%d
  ", val);

  }
  
  static ssize_t
  store_in(struct device *dev, struct device_attribute *attr,
  	 const char *buf, size_t count)
  {
  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int nr = sensor_attr->nr;
  	int index = sensor_attr->index;
  	struct i2c_client *client = to_i2c_client(dev);
  	struct w83793_data *data = i2c_get_clientdata(client);

  	unsigned long val;
  	int err;
  
  	err = kstrtoul(buf, 10, &val);
  	if (err)
  		return err;
  	val = (val + scale_in[index] / 2) / scale_in[index];

  	mutex_lock(&data->update_lock);
  	if (index > 2) {

  		/* fix the limit values of 5VDD and 5VSB to ALARM mechanism */

  		if (nr == 1 || nr == 2)

  			val -= scale_in_add[index] / scale_in[index];

  		val = clamp_val(val, 0, 255);

  	} else {

  		val = clamp_val(val, 0, 0x3FF);

  		data->in_low_bits[nr] =
  		    w83793_read_value(client, W83793_REG_IN_LOW_BITS[nr]);
  		data->in_low_bits[nr] &= ~(0x03 << (2 * index));
  		data->in_low_bits[nr] |= (val & 0x03) << (2 * index);
  		w83793_write_value(client, W83793_REG_IN_LOW_BITS[nr],
  						     data->in_low_bits[nr]);
  		val >>= 2;
  	}
  	data->in[index][nr] = val;
  	w83793_write_value(client, W83793_REG_IN[index][nr],
  							data->in[index][nr]);
  	mutex_unlock(&data->update_lock);
  	return count;
  }
  
  #define NOT_USED			-1
  
  #define SENSOR_ATTR_IN(index)						\
  	SENSOR_ATTR_2(in##index##_input, S_IRUGO, show_in, NULL,	\
  		IN_READ, index),					\
  	SENSOR_ATTR_2(in##index##_max, S_IRUGO | S_IWUSR, show_in,	\
  		store_in, IN_MAX, index),				\
  	SENSOR_ATTR_2(in##index##_min, S_IRUGO | S_IWUSR, show_in,	\
  		store_in, IN_LOW, index),				\
  	SENSOR_ATTR_2(in##index##_alarm, S_IRUGO, show_alarm_beep,	\
  		NULL, ALARM_STATUS, index + ((index > 2) ? 1 : 0)),	\
  	SENSOR_ATTR_2(in##index##_beep, S_IWUSR | S_IRUGO,		\
  		show_alarm_beep, store_beep, BEEP_ENABLE,		\
  		index + ((index > 2) ? 1 : 0))
  
  #define SENSOR_ATTR_FAN(index)						\
  	SENSOR_ATTR_2(fan##index##_alarm, S_IRUGO, show_alarm_beep,	\
  		NULL, ALARM_STATUS, index + 17),			\
  	SENSOR_ATTR_2(fan##index##_beep, S_IWUSR | S_IRUGO,		\
  		show_alarm_beep, store_beep, BEEP_ENABLE, index + 17),	\
  	SENSOR_ATTR_2(fan##index##_input, S_IRUGO, show_fan,		\
  		NULL, FAN_INPUT, index - 1),				\
  	SENSOR_ATTR_2(fan##index##_min, S_IWUSR | S_IRUGO,		\
  		show_fan, store_fan_min, FAN_MIN, index - 1)
  
  #define SENSOR_ATTR_PWM(index)						\
  	SENSOR_ATTR_2(pwm##index, S_IWUSR | S_IRUGO, show_pwm,		\
  		store_pwm, PWM_DUTY, index - 1),			\
  	SENSOR_ATTR_2(pwm##index##_nonstop, S_IWUSR | S_IRUGO,		\
  		show_pwm, store_pwm, PWM_NONSTOP, index - 1),		\
  	SENSOR_ATTR_2(pwm##index##_start, S_IWUSR | S_IRUGO,		\
  		show_pwm, store_pwm, PWM_START, index - 1),		\
  	SENSOR_ATTR_2(pwm##index##_stop_time, S_IWUSR | S_IRUGO,	\
  		show_pwm, store_pwm, PWM_STOP_TIME, index - 1)
  
  #define SENSOR_ATTR_TEMP(index)						\
  	SENSOR_ATTR_2(temp##index##_type, S_IRUGO | S_IWUSR,		\
  		show_temp_mode, store_temp_mode, NOT_USED, index - 1),	\
  	SENSOR_ATTR_2(temp##index##_input, S_IRUGO, show_temp,		\
  		NULL, TEMP_READ, index - 1),				\
  	SENSOR_ATTR_2(temp##index##_max, S_IRUGO | S_IWUSR, show_temp,	\
  		store_temp, TEMP_CRIT, index - 1),			\
  	SENSOR_ATTR_2(temp##index##_max_hyst, S_IRUGO | S_IWUSR,	\
  		show_temp, store_temp, TEMP_CRIT_HYST, index - 1),	\
  	SENSOR_ATTR_2(temp##index##_warn, S_IRUGO | S_IWUSR, show_temp,	\
  		store_temp, TEMP_WARN, index - 1),			\
  	SENSOR_ATTR_2(temp##index##_warn_hyst, S_IRUGO | S_IWUSR,	\
  		show_temp, store_temp, TEMP_WARN_HYST, index - 1),	\
  	SENSOR_ATTR_2(temp##index##_alarm, S_IRUGO,			\
  		show_alarm_beep, NULL, ALARM_STATUS, index + 11),	\
  	SENSOR_ATTR_2(temp##index##_beep, S_IWUSR | S_IRUGO,		\
  		show_alarm_beep, store_beep, BEEP_ENABLE, index + 11),	\
  	SENSOR_ATTR_2(temp##index##_auto_channels_pwm,			\
  		S_IRUGO | S_IWUSR, show_sf_ctrl, store_sf_ctrl,		\
  		TEMP_FAN_MAP, index - 1),				\
  	SENSOR_ATTR_2(temp##index##_pwm_enable, S_IWUSR | S_IRUGO,	\
  		show_sf_ctrl, store_sf_ctrl, TEMP_PWM_ENABLE,		\
  		index - 1),						\
  	SENSOR_ATTR_2(thermal_cruise##index, S_IRUGO | S_IWUSR,		\
  		show_sf_ctrl, store_sf_ctrl, TEMP_CRUISE, index - 1),	\
  	SENSOR_ATTR_2(tolerance##index, S_IRUGO | S_IWUSR, show_sf_ctrl,\
  		store_sf_ctrl, TEMP_TOLERANCE, index - 1),		\
  	SENSOR_ATTR_2(temp##index##_auto_point1_pwm, S_IRUGO | S_IWUSR, \
  		show_sf2_pwm, store_sf2_pwm, 0, index - 1),		\
  	SENSOR_ATTR_2(temp##index##_auto_point2_pwm, S_IRUGO | S_IWUSR, \
  		show_sf2_pwm, store_sf2_pwm, 1, index - 1),		\
  	SENSOR_ATTR_2(temp##index##_auto_point3_pwm, S_IRUGO | S_IWUSR, \
  		show_sf2_pwm, store_sf2_pwm, 2, index - 1),		\
  	SENSOR_ATTR_2(temp##index##_auto_point4_pwm, S_IRUGO | S_IWUSR, \
  		show_sf2_pwm, store_sf2_pwm, 3, index - 1),		\
  	SENSOR_ATTR_2(temp##index##_auto_point5_pwm, S_IRUGO | S_IWUSR, \
  		show_sf2_pwm, store_sf2_pwm, 4, index - 1),		\
  	SENSOR_ATTR_2(temp##index##_auto_point6_pwm, S_IRUGO | S_IWUSR, \
  		show_sf2_pwm, store_sf2_pwm, 5, index - 1),		\
  	SENSOR_ATTR_2(temp##index##_auto_point7_pwm, S_IRUGO | S_IWUSR, \
  		show_sf2_pwm, store_sf2_pwm, 6, index - 1),		\
  	SENSOR_ATTR_2(temp##index##_auto_point1_temp, S_IRUGO | S_IWUSR,\
  		show_sf2_temp, store_sf2_temp, 0, index - 1),		\
  	SENSOR_ATTR_2(temp##index##_auto_point2_temp, S_IRUGO | S_IWUSR,\
  		show_sf2_temp, store_sf2_temp, 1, index - 1),		\
  	SENSOR_ATTR_2(temp##index##_auto_point3_temp, S_IRUGO | S_IWUSR,\
  		show_sf2_temp, store_sf2_temp, 2, index - 1),		\
  	SENSOR_ATTR_2(temp##index##_auto_point4_temp, S_IRUGO | S_IWUSR,\
  		show_sf2_temp, store_sf2_temp, 3, index - 1),		\
  	SENSOR_ATTR_2(temp##index##_auto_point5_temp, S_IRUGO | S_IWUSR,\
  		show_sf2_temp, store_sf2_temp, 4, index - 1),		\
  	SENSOR_ATTR_2(temp##index##_auto_point6_temp, S_IRUGO | S_IWUSR,\
  		show_sf2_temp, store_sf2_temp, 5, index - 1),		\
  	SENSOR_ATTR_2(temp##index##_auto_point7_temp, S_IRUGO | S_IWUSR,\
  		show_sf2_temp, store_sf2_temp, 6, index - 1)
  
  static struct sensor_device_attribute_2 w83793_sensor_attr_2[] = {
  	SENSOR_ATTR_IN(0),
  	SENSOR_ATTR_IN(1),
  	SENSOR_ATTR_IN(2),
  	SENSOR_ATTR_IN(3),
  	SENSOR_ATTR_IN(4),
  	SENSOR_ATTR_IN(5),
  	SENSOR_ATTR_IN(6),
  	SENSOR_ATTR_IN(7),
  	SENSOR_ATTR_IN(8),
  	SENSOR_ATTR_IN(9),

  	SENSOR_ATTR_FAN(1),
  	SENSOR_ATTR_FAN(2),
  	SENSOR_ATTR_FAN(3),
  	SENSOR_ATTR_FAN(4),
  	SENSOR_ATTR_FAN(5),
  	SENSOR_ATTR_PWM(1),
  	SENSOR_ATTR_PWM(2),
  	SENSOR_ATTR_PWM(3),
  };

  static struct sensor_device_attribute_2 w83793_temp[] = {
  	SENSOR_ATTR_TEMP(1),
  	SENSOR_ATTR_TEMP(2),
  	SENSOR_ATTR_TEMP(3),
  	SENSOR_ATTR_TEMP(4),
  	SENSOR_ATTR_TEMP(5),
  	SENSOR_ATTR_TEMP(6),
  };

  /* Fan6-Fan12 */
  static struct sensor_device_attribute_2 w83793_left_fan[] = {
  	SENSOR_ATTR_FAN(6),
  	SENSOR_ATTR_FAN(7),
  	SENSOR_ATTR_FAN(8),
  	SENSOR_ATTR_FAN(9),
  	SENSOR_ATTR_FAN(10),
  	SENSOR_ATTR_FAN(11),
  	SENSOR_ATTR_FAN(12),
  };
  
  /* Pwm4-Pwm8 */
  static struct sensor_device_attribute_2 w83793_left_pwm[] = {
  	SENSOR_ATTR_PWM(4),
  	SENSOR_ATTR_PWM(5),
  	SENSOR_ATTR_PWM(6),
  	SENSOR_ATTR_PWM(7),
  	SENSOR_ATTR_PWM(8),
  };

  static struct sensor_device_attribute_2 w83793_vid[] = {

  	SENSOR_ATTR_2(cpu0_vid, S_IRUGO, show_vid, NULL, NOT_USED, 0),
  	SENSOR_ATTR_2(cpu1_vid, S_IRUGO, show_vid, NULL, NOT_USED, 1),

  };

  static DEVICE_ATTR_RW(vrm);

  
  static struct sensor_device_attribute_2 sda_single_files[] = {

  	SENSOR_ATTR_2(intrusion0_alarm, S_IWUSR | S_IRUGO, show_alarm_beep,

  		      store_chassis_clear, ALARM_STATUS, 30),
  	SENSOR_ATTR_2(beep_enable, S_IWUSR | S_IRUGO, show_beep_enable,
  		      store_beep_enable, NOT_USED, NOT_USED),
  	SENSOR_ATTR_2(pwm_default, S_IWUSR | S_IRUGO, show_sf_setup,
  		      store_sf_setup, SETUP_PWM_DEFAULT, NOT_USED),
  	SENSOR_ATTR_2(pwm_uptime, S_IWUSR | S_IRUGO, show_sf_setup,
  		      store_sf_setup, SETUP_PWM_UPTIME, NOT_USED),
  	SENSOR_ATTR_2(pwm_downtime, S_IWUSR | S_IRUGO, show_sf_setup,
  		      store_sf_setup, SETUP_PWM_DOWNTIME, NOT_USED),
  	SENSOR_ATTR_2(temp_critical, S_IWUSR | S_IRUGO, show_sf_setup,
  		      store_sf_setup, SETUP_TEMP_CRITICAL, NOT_USED),
  };
  
  static void w83793_init_client(struct i2c_client *client)
  {

  	if (reset)

  		w83793_write_value(client, W83793_REG_CONFIG, 0x80);

  
  	/* Start monitoring */
  	w83793_write_value(client, W83793_REG_CONFIG,
  			   w83793_read_value(client, W83793_REG_CONFIG) | 0x01);

  }
  
  /*
   * Watchdog routines
   */
  
  static int watchdog_set_timeout(struct w83793_data *data, int timeout)
  {

  	unsigned int mtimeout;
  	int ret;

  
  	mtimeout = DIV_ROUND_UP(timeout, 60);
  
  	if (mtimeout > 255)
  		return -EINVAL;
  
  	mutex_lock(&data->watchdog_lock);
  	if (!data->client) {
  		ret = -ENODEV;
  		goto leave;
  	}
  
  	data->watchdog_timeout = mtimeout;
  
  	/* Set Timeout value (in Minutes) */
  	w83793_write_value(data->client, W83793_REG_WDT_TIMEOUT,
  			   data->watchdog_timeout);
  
  	ret = mtimeout * 60;
  
  leave:
  	mutex_unlock(&data->watchdog_lock);
  	return ret;
  }
  
  static int watchdog_get_timeout(struct w83793_data *data)
  {
  	int timeout;
  
  	mutex_lock(&data->watchdog_lock);
  	timeout = data->watchdog_timeout * 60;
  	mutex_unlock(&data->watchdog_lock);
  
  	return timeout;
  }
  
  static int watchdog_trigger(struct w83793_data *data)
  {
  	int ret = 0;
  
  	mutex_lock(&data->watchdog_lock);
  	if (!data->client) {
  		ret = -ENODEV;
  		goto leave;
  	}
  
  	/* Set Timeout value (in Minutes) */
  	w83793_write_value(data->client, W83793_REG_WDT_TIMEOUT,
  			   data->watchdog_timeout);
  
  leave:
  	mutex_unlock(&data->watchdog_lock);
  	return ret;
  }
  
  static int watchdog_enable(struct w83793_data *data)
  {
  	int ret = 0;
  
  	mutex_lock(&data->watchdog_lock);
  	if (!data->client) {
  		ret = -ENODEV;
  		goto leave;
  	}
  
  	/* Set initial timeout */
  	w83793_write_value(data->client, W83793_REG_WDT_TIMEOUT,
  			   data->watchdog_timeout);
  
  	/* Enable Soft Watchdog */
  	w83793_write_value(data->client, W83793_REG_WDT_LOCK, 0x55);
  
  leave:
  	mutex_unlock(&data->watchdog_lock);
  	return ret;
  }
  
  static int watchdog_disable(struct w83793_data *data)
  {
  	int ret = 0;
  
  	mutex_lock(&data->watchdog_lock);
  	if (!data->client) {
  		ret = -ENODEV;
  		goto leave;
  	}
  
  	/* Disable Soft Watchdog */
  	w83793_write_value(data->client, W83793_REG_WDT_LOCK, 0xAA);
  
  leave:
  	mutex_unlock(&data->watchdog_lock);
  	return ret;
  }
  
  static int watchdog_open(struct inode *inode, struct file *filp)
  {
  	struct w83793_data *pos, *data = NULL;
  	int watchdog_is_open;

  	/*
  	 * We get called from drivers/char/misc.c with misc_mtx hold, and we
  	 * call misc_register() from  w83793_probe() with watchdog_data_mutex
  	 * hold, as misc_register() takes the misc_mtx lock, this is a possible
  	 * deadlock, so we use mutex_trylock here.
  	 */

  	if (!mutex_trylock(&watchdog_data_mutex))
  		return -ERESTARTSYS;
  	list_for_each_entry(pos, &watchdog_data_list, list) {
  		if (pos->watchdog_miscdev.minor == iminor(inode)) {
  			data = pos;
  			break;
  		}
  	}
  
  	/* Check, if device is already open */
  	watchdog_is_open = test_and_set_bit(0, &data->watchdog_is_open);

  	/*
  	 * Increase data reference counter (if not already done).
  	 * Note we can never not have found data, so we don't check for this
  	 */

  	if (!watchdog_is_open)
  		kref_get(&data->kref);
  
  	mutex_unlock(&watchdog_data_mutex);
  
  	/* Check, if device is already open and possibly issue error */
  	if (watchdog_is_open)
  		return -EBUSY;
  
  	/* Enable Soft Watchdog */
  	watchdog_enable(data);
  
  	/* Store pointer to data into filp's private data */
  	filp->private_data = data;

  	return stream_open(inode, filp);

  }
  
  static int watchdog_close(struct inode *inode, struct file *filp)
  {
  	struct w83793_data *data = filp->private_data;

  	if (data->watchdog_expect_close) {
  		watchdog_disable(data);
  		data->watchdog_expect_close = 0;
  	} else {
  		watchdog_trigger(data);
  		dev_crit(&data->client->dev,
  			"unexpected close, not stopping watchdog!
  ");
  	}
  
  	clear_bit(0, &data->watchdog_is_open);
  
  	/* Decrease data reference counter */
  	mutex_lock(&watchdog_data_mutex);
  	kref_put(&data->kref, w83793_release_resources);
  	mutex_unlock(&watchdog_data_mutex);
  
  	return 0;
  }
  
  static ssize_t watchdog_write(struct file *filp, const char __user *buf,
  	size_t count, loff_t *offset)
  {

  	ssize_t ret;

  	struct w83793_data *data = filp->private_data;
  
  	if (count) {
  		if (!nowayout) {
  			size_t i;
  
  			/* Clear it in case it was set with a previous write */
  			data->watchdog_expect_close = 0;
  
  			for (i = 0; i != count; i++) {
  				char c;
  				if (get_user(c, buf + i))
  					return -EFAULT;
  				if (c == 'V')
  					data->watchdog_expect_close = 1;
  			}
  		}
  		ret = watchdog_trigger(data);
  		if (ret < 0)
  			return ret;
  	}
  	return count;
  }

  static long watchdog_ioctl(struct file *filp, unsigned int cmd,
  			   unsigned long arg)

  {

  	struct watchdog_info ident = {

  		.options = WDIOF_KEEPALIVEPING |
  			   WDIOF_SETTIMEOUT |
  			   WDIOF_CARDRESET,
  		.identity = "w83793 watchdog"
  	};
  
  	int val, ret = 0;
  	struct w83793_data *data = filp->private_data;
  
  	switch (cmd) {
  	case WDIOC_GETSUPPORT:
  		if (!nowayout)
  			ident.options |= WDIOF_MAGICCLOSE;
  		if (copy_to_user((void __user *)arg, &ident, sizeof(ident)))
  			ret = -EFAULT;
  		break;
  
  	case WDIOC_GETSTATUS:
  		val = data->watchdog_caused_reboot ? WDIOF_CARDRESET : 0;
  		ret = put_user(val, (int __user *)arg);
  		break;
  
  	case WDIOC_GETBOOTSTATUS:
  		ret = put_user(0, (int __user *)arg);
  		break;
  
  	case WDIOC_KEEPALIVE:
  		ret = watchdog_trigger(data);
  		break;
  
  	case WDIOC_GETTIMEOUT:
  		val = watchdog_get_timeout(data);
  		ret = put_user(val, (int __user *)arg);
  		break;
  
  	case WDIOC_SETTIMEOUT:
  		if (get_user(val, (int __user *)arg)) {
  			ret = -EFAULT;
  			break;
  		}
  		ret = watchdog_set_timeout(data, val);
  		if (ret > 0)
  			ret = put_user(ret, (int __user *)arg);
  		break;
  
  	case WDIOC_SETOPTIONS:
  		if (get_user(val, (int __user *)arg)) {
  			ret = -EFAULT;
  			break;
  		}
  
  		if (val & WDIOS_DISABLECARD)
  			ret = watchdog_disable(data);
  		else if (val & WDIOS_ENABLECARD)
  			ret = watchdog_enable(data);
  		else
  			ret = -EINVAL;
  
  		break;
  	default:
  		ret = -ENOTTY;
  	}

  	return ret;
  }
  
  static const struct file_operations watchdog_fops = {
  	.owner = THIS_MODULE,
  	.llseek = no_llseek,
  	.open = watchdog_open,
  	.release = watchdog_close,
  	.write = watchdog_write,

  	.unlocked_ioctl = watchdog_ioctl,

  	.compat_ioctl = compat_ptr_ioctl,

  };
  
  /*
   *	Notifier for system down
   */
  
  static int watchdog_notify_sys(struct notifier_block *this, unsigned long code,
  			       void *unused)
  {
  	struct w83793_data *data = NULL;
  
  	if (code == SYS_DOWN || code == SYS_HALT) {
  
  		/* Disable each registered watchdog */
  		mutex_lock(&watchdog_data_mutex);
  		list_for_each_entry(data, &watchdog_data_list, list) {
  			if (data->watchdog_miscdev.minor)
  				watchdog_disable(data);
  		}
  		mutex_unlock(&watchdog_data_mutex);
  	}
  
  	return NOTIFY_DONE;

  }

  /*
   *	The WDT needs to learn about soft shutdowns in order to
   *	turn the timebomb registers off.
   */
  
  static struct notifier_block watchdog_notifier = {
  	.notifier_call = watchdog_notify_sys,
  };
  
  /*
   * Init / remove routines
   */

  static int w83793_remove(struct i2c_client *client)

  {
  	struct w83793_data *data = i2c_get_clientdata(client);
  	struct device *dev = &client->dev;

  	int i, tmp;
  
  	/* Unregister the watchdog (if registered) */
  	if (data->watchdog_miscdev.minor) {
  		misc_deregister(&data->watchdog_miscdev);
  
  		if (data->watchdog_is_open) {
  			dev_warn(&client->dev,
  				"i2c client detached with watchdog open! "
  				"Stopping watchdog.
  ");
  			watchdog_disable(data);
  		}
  
  		mutex_lock(&watchdog_data_mutex);
  		list_del(&data->list);
  		mutex_unlock(&watchdog_data_mutex);
  
  		/* Tell the watchdog code the client is gone */
  		mutex_lock(&data->watchdog_lock);
  		data->client = NULL;
  		mutex_unlock(&data->watchdog_lock);
  	}
  
  	/* Reset Configuration Register to Disable Watch Dog Registers */
  	tmp = w83793_read_value(client, W83793_REG_CONFIG);
  	w83793_write_value(client, W83793_REG_CONFIG, tmp & ~0x04);
  
  	unregister_reboot_notifier(&watchdog_notifier);

  	hwmon_device_unregister(data->hwmon_dev);

  	for (i = 0; i < ARRAY_SIZE(w83793_sensor_attr_2); i++)
  		device_remove_file(dev,
  				   &w83793_sensor_attr_2[i].dev_attr);

  	for (i = 0; i < ARRAY_SIZE(sda_single_files); i++)
  		device_remove_file(dev, &sda_single_files[i].dev_attr);

  	for (i = 0; i < ARRAY_SIZE(w83793_vid); i++)
  		device_remove_file(dev, &w83793_vid[i].dev_attr);
  	device_remove_file(dev, &dev_attr_vrm);

  	for (i = 0; i < ARRAY_SIZE(w83793_left_fan); i++)
  		device_remove_file(dev, &w83793_left_fan[i].dev_attr);

  	for (i = 0; i < ARRAY_SIZE(w83793_left_pwm); i++)
  		device_remove_file(dev, &w83793_left_pwm[i].dev_attr);

  	for (i = 0; i < ARRAY_SIZE(w83793_temp); i++)
  		device_remove_file(dev, &w83793_temp[i].dev_attr);

  	/* Decrease data reference counter */
  	mutex_lock(&watchdog_data_mutex);
  	kref_put(&data->kref, w83793_release_resources);
  	mutex_unlock(&watchdog_data_mutex);

  
  	return 0;
  }
  
  static int

  w83793_detect_subclients(struct i2c_client *client)

  {

  	int i, id;

  	int address = client->addr;

  	u8 tmp;

  	struct i2c_adapter *adapter = client->adapter;

  	struct w83793_data *data = i2c_get_clientdata(client);
  
  	id = i2c_adapter_id(adapter);
  	if (force_subclients[0] == id && force_subclients[1] == address) {
  		for (i = 2; i <= 3; i++) {
  			if (force_subclients[i] < 0x48
  			    || force_subclients[i] > 0x4f) {
  				dev_err(&client->dev,
  					"invalid subclient "
  					"address %d; must be 0x48-0x4f
  ",
  					force_subclients[i]);

  				return -EINVAL;

  			}
  		}
  		w83793_write_value(client, W83793_REG_I2C_SUBADDR,
  				   (force_subclients[2] & 0x07) |
  				   ((force_subclients[3] & 0x07) << 4));
  	}
  
  	tmp = w83793_read_value(client, W83793_REG_I2C_SUBADDR);

  	if (!(tmp & 0x08))

  		data->lm75[0] = devm_i2c_new_dummy_device(&client->dev, adapter,
  							  0x48 + (tmp & 0x7));

  	if (!(tmp & 0x80)) {

  		if (!IS_ERR(data->lm75[0])

  		    && ((tmp & 0x7) == ((tmp >> 4) & 0x7))) {
  			dev_err(&client->dev,
  				"duplicate addresses 0x%x, "
  				"use force_subclients
  ", data->lm75[0]->addr);

  			return -ENODEV;

  		}

  		data->lm75[1] = devm_i2c_new_dummy_device(&client->dev, adapter,
  							  0x48 + ((tmp >> 4) & 0x7));

  	}
  
  	return 0;

  }

  /* Return 0 if detection is successful, -ENODEV otherwise */

  static int w83793_detect(struct i2c_client *client,

  			 struct i2c_board_info *info)

  {

  	u8 tmp, bank, chip_id;

  	struct i2c_adapter *adapter = client->adapter;
  	unsigned short address = client->addr;

  	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))

  		return -ENODEV;

  	bank = i2c_smbus_read_byte_data(client, W83793_REG_BANKSEL);

  	tmp = bank & 0x80 ? 0x5c : 0xa3;
  	/* Check Winbond vendor ID */
  	if (tmp != i2c_smbus_read_byte_data(client, W83793_REG_VENDORID)) {
  		pr_debug("w83793: Detection failed at check vendor id
  ");
  		return -ENODEV;

  	}

  	/*
  	 * If Winbond chip, address of chip and W83793_REG_I2C_ADDR
  	 * should match
  	 */

  	if ((bank & 0x07) == 0
  	 && i2c_smbus_read_byte_data(client, W83793_REG_I2C_ADDR) !=
  	    (address << 1)) {
  		pr_debug("w83793: Detection failed at check i2c addr
  ");
  		return -ENODEV;

  	}

  	/* Determine the chip type now */
  	chip_id = i2c_smbus_read_byte_data(client, W83793_REG_CHIPID);
  	if (chip_id != 0x7b)
  		return -ENODEV;

  	strlcpy(info->type, "w83793", I2C_NAME_SIZE);
  
  	return 0;
  }

  static int w83793_probe(struct i2c_client *client)

  {
  	struct device *dev = &client->dev;

  	static const int watchdog_minors[] = {
  		WATCHDOG_MINOR, 212, 213, 214, 215
  	};

  	struct w83793_data *data;
  	int i, tmp, val, err;
  	int files_fan = ARRAY_SIZE(w83793_left_fan) / 7;
  	int files_pwm = ARRAY_SIZE(w83793_left_pwm) / 5;
  	int files_temp = ARRAY_SIZE(w83793_temp) / 6;
  
  	data = kzalloc(sizeof(struct w83793_data), GFP_KERNEL);
  	if (!data) {
  		err = -ENOMEM;
  		goto exit;
  	}
  
  	i2c_set_clientdata(client, data);
  	data->bank = i2c_smbus_read_byte_data(client, W83793_REG_BANKSEL);

  	mutex_init(&data->update_lock);

  	mutex_init(&data->watchdog_lock);
  	INIT_LIST_HEAD(&data->list);
  	kref_init(&data->kref);

  	/*
  	 * Store client pointer in our data struct for watchdog usage
  	 * (where the client is found through a data ptr instead of the
  	 * otherway around)
  	 */

  	data->client = client;

  	err = w83793_detect_subclients(client);
  	if (err)

  		goto free_mem;

  	/* Initialize the chip */
  	w83793_init_client(client);

  	/*

  	 * Only fan 1-5 has their own input pins,
  	 * Pwm 1-3 has their own pins

  	 */
  	data->has_fan = 0x1f;
  	data->has_pwm = 0x07;
  	tmp = w83793_read_value(client, W83793_REG_MFC);
  	val = w83793_read_value(client, W83793_REG_FANIN_CTRL);
  
  	/* check the function of pins 49-56 */

  	if (tmp & 0x80) {
  		data->has_vid |= 0x2;	/* has VIDB */
  	} else {

  		data->has_pwm |= 0x18;	/* pwm 4,5 */
  		if (val & 0x01) {	/* fan 6 */
  			data->has_fan |= 0x20;
  			data->has_pwm |= 0x20;
  		}
  		if (val & 0x02) {	/* fan 7 */
  			data->has_fan |= 0x40;
  			data->has_pwm |= 0x40;
  		}
  		if (!(tmp & 0x40) && (val & 0x04)) {	/* fan 8 */
  			data->has_fan |= 0x80;
  			data->has_pwm |= 0x80;
  		}
  	}

  	/* check the function of pins 37-40 */
  	if (!(tmp & 0x29))
  		data->has_vid |= 0x1;	/* has VIDA */

  	if (0x08 == (tmp & 0x0c)) {
  		if (val & 0x08)	/* fan 9 */
  			data->has_fan |= 0x100;
  		if (val & 0x10)	/* fan 10 */
  			data->has_fan |= 0x200;
  	}

  	if (0x20 == (tmp & 0x30)) {
  		if (val & 0x20)	/* fan 11 */
  			data->has_fan |= 0x400;
  		if (val & 0x40)	/* fan 12 */
  			data->has_fan |= 0x800;
  	}
  
  	if ((tmp & 0x01) && (val & 0x04)) {	/* fan 8, second location */
  		data->has_fan |= 0x80;
  		data->has_pwm |= 0x80;
  	}

  	tmp = w83793_read_value(client, W83793_REG_FANIN_SEL);
  	if ((tmp & 0x01) && (val & 0x08)) {	/* fan 9, second location */
  		data->has_fan |= 0x100;
  	}
  	if ((tmp & 0x02) && (val & 0x10)) {	/* fan 10, second location */
  		data->has_fan |= 0x200;
  	}
  	if ((tmp & 0x04) && (val & 0x20)) {	/* fan 11, second location */
  		data->has_fan |= 0x400;
  	}
  	if ((tmp & 0x08) && (val & 0x40)) {	/* fan 12, second location */
  		data->has_fan |= 0x800;
  	}

  	/* check the temp1-6 mode, ignore former AMDSI selected inputs */

  	tmp = w83793_read_value(client, W83793_REG_TEMP_MODE[0]);

  	if (tmp & 0x01)
  		data->has_temp |= 0x01;
  	if (tmp & 0x04)
  		data->has_temp |= 0x02;
  	if (tmp & 0x10)
  		data->has_temp |= 0x04;
  	if (tmp & 0x40)
  		data->has_temp |= 0x08;

  	tmp = w83793_read_value(client, W83793_REG_TEMP_MODE[1]);

  	if (tmp & 0x01)
  		data->has_temp |= 0x10;
  	if (tmp & 0x02)
  		data->has_temp |= 0x20;

  	/* Register sysfs hooks */
  	for (i = 0; i < ARRAY_SIZE(w83793_sensor_attr_2); i++) {
  		err = device_create_file(dev,
  					 &w83793_sensor_attr_2[i].dev_attr);
  		if (err)
  			goto exit_remove;
  	}

  	for (i = 0; i < ARRAY_SIZE(w83793_vid); i++) {
  		if (!(data->has_vid & (1 << i)))
  			continue;
  		err = device_create_file(dev, &w83793_vid[i].dev_attr);
  		if (err)
  			goto exit_remove;
  	}

  	if (data->has_vid) {
  		data->vrm = vid_which_vrm();
  		err = device_create_file(dev, &dev_attr_vrm);
  		if (err)
  			goto exit_remove;
  	}

  	for (i = 0; i < ARRAY_SIZE(sda_single_files); i++) {
  		err = device_create_file(dev, &sda_single_files[i].dev_attr);
  		if (err)
  			goto exit_remove;
  
  	}

  	for (i = 0; i < 6; i++) {
  		int j;
  		if (!(data->has_temp & (1 << i)))
  			continue;
  		for (j = 0; j < files_temp; j++) {
  			err = device_create_file(dev,
  						&w83793_temp[(i) * files_temp
  								+ j].dev_attr);
  			if (err)
  				goto exit_remove;
  		}
  	}

  	for (i = 5; i < 12; i++) {
  		int j;
  		if (!(data->has_fan & (1 << i)))
  			continue;
  		for (j = 0; j < files_fan; j++) {
  			err = device_create_file(dev,
  					   &w83793_left_fan[(i - 5) * files_fan
  								+ j].dev_attr);
  			if (err)
  				goto exit_remove;
  		}
  	}
  
  	for (i = 3; i < 8; i++) {
  		int j;
  		if (!(data->has_pwm & (1 << i)))
  			continue;
  		for (j = 0; j < files_pwm; j++) {
  			err = device_create_file(dev,
  					   &w83793_left_pwm[(i - 3) * files_pwm
  								+ j].dev_attr);
  			if (err)
  				goto exit_remove;
  		}
  	}

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

  		goto exit_remove;
  	}

  	/* Watchdog initialization */
  
  	/* Register boot notifier */
  	err = register_reboot_notifier(&watchdog_notifier);
  	if (err != 0) {
  		dev_err(&client->dev,
  			"cannot register reboot notifier (err=%d)
  ", err);
  		goto exit_devunreg;
  	}

  	/*
  	 * Enable Watchdog registers.
  	 * Set Configuration Register to Enable Watch Dog Registers
  	 * (Bit 2) = XXXX, X1XX.
  	 */

  	tmp = w83793_read_value(client, W83793_REG_CONFIG);
  	w83793_write_value(client, W83793_REG_CONFIG, tmp | 0x04);
  
  	/* Set the default watchdog timeout */
  	data->watchdog_timeout = timeout;
  
  	/* Check, if last reboot was caused by watchdog */
  	data->watchdog_caused_reboot =
  	  w83793_read_value(data->client, W83793_REG_WDT_STATUS) & 0x01;
  
  	/* Disable Soft Watchdog during initialiation */
  	watchdog_disable(data);

  	/*
  	 * We take the data_mutex lock early so that watchdog_open() cannot
  	 * run when misc_register() has completed, but we've not yet added
  	 * our data to the watchdog_data_list (and set the default timeout)
  	 */

  	mutex_lock(&watchdog_data_mutex);
  	for (i = 0; i < ARRAY_SIZE(watchdog_minors); i++) {
  		/* Register our watchdog part */
  		snprintf(data->watchdog_name, sizeof(data->watchdog_name),
  			"watchdog%c", (i == 0) ? '\0' : ('0' + i));
  		data->watchdog_miscdev.name = data->watchdog_name;
  		data->watchdog_miscdev.fops = &watchdog_fops;
  		data->watchdog_miscdev.minor = watchdog_minors[i];
  
  		err = misc_register(&data->watchdog_miscdev);
  		if (err == -EBUSY)
  			continue;
  		if (err) {
  			data->watchdog_miscdev.minor = 0;
  			dev_err(&client->dev,
  				"Registering watchdog chardev: %d
  ", err);
  			break;
  		}
  
  		list_add(&data->list, &watchdog_data_list);
  
  		dev_info(&client->dev,
  			"Registered watchdog chardev major 10, minor: %d
  ",
  			watchdog_minors[i]);
  		break;
  	}
  	if (i == ARRAY_SIZE(watchdog_minors)) {
  		data->watchdog_miscdev.minor = 0;

  		dev_warn(&client->dev,
  			 "Couldn't register watchdog chardev (due to no free minor)
  ");

  	}
  
  	mutex_unlock(&watchdog_data_mutex);

  	return 0;

  	/* Unregister hwmon device */
  
  exit_devunreg:
  
  	hwmon_device_unregister(data->hwmon_dev);

  	/* Unregister sysfs hooks */
  
  exit_remove:
  	for (i = 0; i < ARRAY_SIZE(w83793_sensor_attr_2); i++)
  		device_remove_file(dev, &w83793_sensor_attr_2[i].dev_attr);
  
  	for (i = 0; i < ARRAY_SIZE(sda_single_files); i++)
  		device_remove_file(dev, &sda_single_files[i].dev_attr);

  	for (i = 0; i < ARRAY_SIZE(w83793_vid); i++)
  		device_remove_file(dev, &w83793_vid[i].dev_attr);

  	for (i = 0; i < ARRAY_SIZE(w83793_left_fan); i++)
  		device_remove_file(dev, &w83793_left_fan[i].dev_attr);
  
  	for (i = 0; i < ARRAY_SIZE(w83793_left_pwm); i++)
  		device_remove_file(dev, &w83793_left_pwm[i].dev_attr);

  	for (i = 0; i < ARRAY_SIZE(w83793_temp); i++)
  		device_remove_file(dev, &w83793_temp[i].dev_attr);

  free_mem:
  	kfree(data);
  exit:
  	return err;
  }
  
  static void w83793_update_nonvolatile(struct device *dev)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct w83793_data *data = i2c_get_clientdata(client);
  	int i, j;
  	/*

  	 * They are somewhat "stable" registers, and to update them every time
  	 * takes so much time, it's just not worthy. Update them in a long
  	 * interval to avoid exception.

  	 */
  	if (!(time_after(jiffies, data->last_nonvolatile + HZ * 300)
  	      || !data->valid))
  		return;
  	/* update voltage limits */
  	for (i = 1; i < 3; i++) {
  		for (j = 0; j < ARRAY_SIZE(data->in); j++) {
  			data->in[j][i] =
  			    w83793_read_value(client, W83793_REG_IN[j][i]);
  		}
  		data->in_low_bits[i] =
  		    w83793_read_value(client, W83793_REG_IN_LOW_BITS[i]);
  	}
  
  	for (i = 0; i < ARRAY_SIZE(data->fan_min); i++) {
  		/* Update the Fan measured value and limits */

  		if (!(data->has_fan & (1 << i)))

  			continue;

  		data->fan_min[i] =
  		    w83793_read_value(client, W83793_REG_FAN_MIN(i)) << 8;
  		data->fan_min[i] |=
  		    w83793_read_value(client, W83793_REG_FAN_MIN(i) + 1);
  	}
  
  	for (i = 0; i < ARRAY_SIZE(data->temp_fan_map); i++) {

  		if (!(data->has_temp & (1 << i)))
  			continue;

  		data->temp_fan_map[i] =
  		    w83793_read_value(client, W83793_REG_TEMP_FAN_MAP(i));
  		for (j = 1; j < 5; j++) {
  			data->temp[i][j] =
  			    w83793_read_value(client, W83793_REG_TEMP[i][j]);
  		}
  		data->temp_cruise[i] =
  		    w83793_read_value(client, W83793_REG_TEMP_CRUISE(i));
  		for (j = 0; j < 7; j++) {
  			data->sf2_pwm[i][j] =
  			    w83793_read_value(client, W83793_REG_SF2_PWM(i, j));
  			data->sf2_temp[i][j] =
  			    w83793_read_value(client,
  					      W83793_REG_SF2_TEMP(i, j));
  		}
  	}
  
  	for (i = 0; i < ARRAY_SIZE(data->temp_mode); i++)
  		data->temp_mode[i] =
  		    w83793_read_value(client, W83793_REG_TEMP_MODE[i]);
  
  	for (i = 0; i < ARRAY_SIZE(data->tolerance); i++) {
  		data->tolerance[i] =
  		    w83793_read_value(client, W83793_REG_TEMP_TOL(i));
  	}
  
  	for (i = 0; i < ARRAY_SIZE(data->pwm); i++) {
  		if (!(data->has_pwm & (1 << i)))
  			continue;
  		data->pwm[i][PWM_NONSTOP] =
  		    w83793_read_value(client, W83793_REG_PWM(i, PWM_NONSTOP));
  		data->pwm[i][PWM_START] =
  		    w83793_read_value(client, W83793_REG_PWM(i, PWM_START));
  		data->pwm_stop_time[i] =
  		    w83793_read_value(client, W83793_REG_PWM_STOP_TIME(i));
  	}
  
  	data->pwm_default = w83793_read_value(client, W83793_REG_PWM_DEFAULT);
  	data->pwm_enable = w83793_read_value(client, W83793_REG_PWM_ENABLE);
  	data->pwm_uptime = w83793_read_value(client, W83793_REG_PWM_UPTIME);
  	data->pwm_downtime = w83793_read_value(client, W83793_REG_PWM_DOWNTIME);
  	data->temp_critical =
  	    w83793_read_value(client, W83793_REG_TEMP_CRITICAL);
  	data->beep_enable = w83793_read_value(client, W83793_REG_OVT_BEEP);

  	for (i = 0; i < ARRAY_SIZE(data->beeps); i++)

  		data->beeps[i] = w83793_read_value(client, W83793_REG_BEEP(i));

  
  	data->last_nonvolatile = jiffies;
  }
  
  static struct w83793_data *w83793_update_device(struct device *dev)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct w83793_data *data = i2c_get_clientdata(client);
  	int i;
  
  	mutex_lock(&data->update_lock);
  
  	if (!(time_after(jiffies, data->last_updated + HZ * 2)
  	      || !data->valid))
  		goto END;
  
  	/* Update the voltages measured value and limits */
  	for (i = 0; i < ARRAY_SIZE(data->in); i++)
  		data->in[i][IN_READ] =
  		    w83793_read_value(client, W83793_REG_IN[i][IN_READ]);
  
  	data->in_low_bits[IN_READ] =
  	    w83793_read_value(client, W83793_REG_IN_LOW_BITS[IN_READ]);
  
  	for (i = 0; i < ARRAY_SIZE(data->fan); i++) {

  		if (!(data->has_fan & (1 << i)))

  			continue;

  		data->fan[i] =
  		    w83793_read_value(client, W83793_REG_FAN(i)) << 8;
  		data->fan[i] |=
  		    w83793_read_value(client, W83793_REG_FAN(i) + 1);
  	}

  	for (i = 0; i < ARRAY_SIZE(data->temp); i++) {
  		if (!(data->has_temp & (1 << i)))
  			continue;

  		data->temp[i][TEMP_READ] =
  		    w83793_read_value(client, W83793_REG_TEMP[i][TEMP_READ]);

  	}

  
  	data->temp_low_bits =
  	    w83793_read_value(client, W83793_REG_TEMP_LOW_BITS);
  
  	for (i = 0; i < ARRAY_SIZE(data->pwm); i++) {
  		if (data->has_pwm & (1 << i))
  			data->pwm[i][PWM_DUTY] =
  			    w83793_read_value(client,
  					      W83793_REG_PWM(i, PWM_DUTY));
  	}
  
  	for (i = 0; i < ARRAY_SIZE(data->alarms); i++)
  		data->alarms[i] =
  		    w83793_read_value(client, W83793_REG_ALARM(i));

  	if (data->has_vid & 0x01)
  		data->vid[0] = w83793_read_value(client, W83793_REG_VID_INA);
  	if (data->has_vid & 0x02)
  		data->vid[1] = w83793_read_value(client, W83793_REG_VID_INB);

  	w83793_update_nonvolatile(dev);
  	data->last_updated = jiffies;
  	data->valid = 1;
  
  END:
  	mutex_unlock(&data->update_lock);
  	return data;
  }

  /*
   * Ignore the possibility that somebody change bank outside the driver
   * Must be called with data->update_lock held, except during initialization
   */

  static u8 w83793_read_value(struct i2c_client *client, u16 reg)
  {
  	struct w83793_data *data = i2c_get_clientdata(client);

  	u8 res;

  	u8 new_bank = reg >> 8;
  
  	new_bank |= data->bank & 0xfc;
  	if (data->bank != new_bank) {
  		if (i2c_smbus_write_byte_data
  		    (client, W83793_REG_BANKSEL, new_bank) >= 0)
  			data->bank = new_bank;
  		else {
  			dev_err(&client->dev,
  				"set bank to %d failed, fall back "
  				"to bank %d, read reg 0x%x error
  ",
  				new_bank, data->bank, reg);
  			res = 0x0;	/* read 0x0 from the chip */
  			goto END;
  		}
  	}
  	res = i2c_smbus_read_byte_data(client, reg & 0xff);
  END:
  	return res;
  }
  
  /* Must be called with data->update_lock held, except during initialization */
  static int w83793_write_value(struct i2c_client *client, u16 reg, u8 value)
  {
  	struct w83793_data *data = i2c_get_clientdata(client);
  	int res;
  	u8 new_bank = reg >> 8;
  
  	new_bank |= data->bank & 0xfc;
  	if (data->bank != new_bank) {

  		res = i2c_smbus_write_byte_data(client, W83793_REG_BANKSEL,
  						new_bank);
  		if (res < 0) {

  			dev_err(&client->dev,
  				"set bank to %d failed, fall back "
  				"to bank %d, write reg 0x%x error
  ",
  				new_bank, data->bank, reg);
  			goto END;
  		}

  		data->bank = new_bank;

  	}
  
  	res = i2c_smbus_write_byte_data(client, reg & 0xff, value);
  END:
  	return res;
  }

  module_i2c_driver(w83793_driver);

  MODULE_AUTHOR("Yuan Mu, Sven Anders");

  MODULE_DESCRIPTION("w83793 driver");
  MODULE_LICENSE("GPL");