/*
   *  w83795.c - Linux kernel driver for hardware monitoring
   *  Copyright (C) 2008 Nuvoton Technology Corp.
   *                Wei Song

   *  Copyright (C) 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 - version 2.
   *
   *  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., 51 Franklin Street, Fifth Floor, Boston, MA
   *  02110-1301 USA.
   *
   *  Supports following chips:
   *
   *  Chip       #vin   #fanin #pwm #temp #dts wchipid  vendid  i2c  ISA
   *  w83795g     21     14     8     6     8    0x79   0x5ca3  yes   no
   *  w83795adg   18     14     2     6     8    0x79   0x5ca3  yes   no
   */
  
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/init.h>
  #include <linux/slab.h>
  #include <linux/i2c.h>
  #include <linux/hwmon.h>
  #include <linux/hwmon-sysfs.h>
  #include <linux/err.h>
  #include <linux/mutex.h>
  #include <linux/delay.h>
  
  /* Addresses to scan */

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

  static bool reset;

  module_param(reset, bool, 0);
  MODULE_PARM_DESC(reset, "Set to 1 to reset chip, not recommended");
  
  
  #define W83795_REG_BANKSEL		0x00
  #define W83795_REG_VENDORID		0xfd
  #define W83795_REG_CHIPID		0xfe
  #define W83795_REG_DEVICEID		0xfb

  #define W83795_REG_DEVICEID_A		0xff

  
  #define W83795_REG_I2C_ADDR		0xfc
  #define W83795_REG_CONFIG		0x01
  #define W83795_REG_CONFIG_CONFIG48	0x04

  #define W83795_REG_CONFIG_START	0x01

  
  /* Multi-Function Pin Ctrl Registers */
  #define W83795_REG_VOLT_CTRL1		0x02
  #define W83795_REG_VOLT_CTRL2		0x03
  #define W83795_REG_TEMP_CTRL1		0x04
  #define W83795_REG_TEMP_CTRL2		0x05
  #define W83795_REG_FANIN_CTRL1		0x06
  #define W83795_REG_FANIN_CTRL2		0x07
  #define W83795_REG_VMIGB_CTRL		0x08

  #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 const u16 W83795_REG_TEMP[][5] = {

  	{0x21, 0x96, 0x97, 0x98, 0x99},	/* TD1/TR1 */
  	{0x22, 0x9a, 0x9b, 0x9c, 0x9d},	/* TD2/TR2 */
  	{0x23, 0x9e, 0x9f, 0xa0, 0xa1},	/* TD3/TR3 */
  	{0x24, 0xa2, 0xa3, 0xa4, 0xa5},	/* TD4/TR4 */
  	{0x1f, 0xa6, 0xa7, 0xa8, 0xa9},	/* TR5 */
  	{0x20, 0xaa, 0xab, 0xac, 0xad},	/* TR6 */
  };
  
  #define IN_READ				0
  #define IN_MAX				1
  #define IN_LOW				2
  static const u16 W83795_REG_IN[][3] = {
  	/* Current, HL, LL */
  	{0x10, 0x70, 0x71},	/* VSEN1 */
  	{0x11, 0x72, 0x73},	/* VSEN2 */
  	{0x12, 0x74, 0x75},	/* VSEN3 */
  	{0x13, 0x76, 0x77},	/* VSEN4 */
  	{0x14, 0x78, 0x79},	/* VSEN5 */
  	{0x15, 0x7a, 0x7b},	/* VSEN6 */
  	{0x16, 0x7c, 0x7d},	/* VSEN7 */
  	{0x17, 0x7e, 0x7f},	/* VSEN8 */
  	{0x18, 0x80, 0x81},	/* VSEN9 */
  	{0x19, 0x82, 0x83},	/* VSEN10 */
  	{0x1A, 0x84, 0x85},	/* VSEN11 */
  	{0x1B, 0x86, 0x87},	/* VTT */
  	{0x1C, 0x88, 0x89},	/* 3VDD */
  	{0x1D, 0x8a, 0x8b},	/* 3VSB */
  	{0x1E, 0x8c, 0x8d},	/* VBAT */
  	{0x1F, 0xa6, 0xa7},	/* VSEN12 */
  	{0x20, 0xaa, 0xab},	/* VSEN13 */
  	{0x21, 0x96, 0x97},	/* VSEN14 */
  	{0x22, 0x9a, 0x9b},	/* VSEN15 */
  	{0x23, 0x9e, 0x9f},	/* VSEN16 */
  	{0x24, 0xa2, 0xa3},	/* VSEN17 */
  };
  #define W83795_REG_VRLSB		0x3C

  
  static const u8 W83795_REG_IN_HL_LSB[] = {
  	0x8e,	/* VSEN1-4 */
  	0x90,	/* VSEN5-8 */
  	0x92,	/* VSEN9-11 */
  	0x94,	/* VTT, 3VDD, 3VSB, 3VBAT */
  	0xa8,	/* VSEN12 */
  	0xac,	/* VSEN13 */
  	0x98,	/* VSEN14 */
  	0x9c,	/* VSEN15 */
  	0xa0,	/* VSEN16 */
  	0xa4,	/* VSEN17 */
  };
  
  #define IN_LSB_REG(index, type) \
  	(((type) == 1) ? W83795_REG_IN_HL_LSB[(index)] \
  	: (W83795_REG_IN_HL_LSB[(index)] + 1))

  #define IN_LSB_SHIFT			0
  #define IN_LSB_IDX			1
  static const u8 IN_LSB_SHIFT_IDX[][2] = {
  	/* High/Low LSB shift, LSB No. */
  	{0x00, 0x00},	/* VSEN1 */
  	{0x02, 0x00},	/* VSEN2 */
  	{0x04, 0x00},	/* VSEN3 */
  	{0x06, 0x00},	/* VSEN4 */
  	{0x00, 0x01},	/* VSEN5 */
  	{0x02, 0x01},	/* VSEN6 */
  	{0x04, 0x01},	/* VSEN7 */
  	{0x06, 0x01},	/* VSEN8 */
  	{0x00, 0x02},	/* VSEN9 */
  	{0x02, 0x02},	/* VSEN10 */
  	{0x04, 0x02},	/* VSEN11 */
  	{0x00, 0x03},	/* VTT */
  	{0x02, 0x03},	/* 3VDD */
  	{0x04, 0x03},	/* 3VSB	*/
  	{0x06, 0x03},	/* VBAT	*/
  	{0x06, 0x04},	/* VSEN12 */
  	{0x06, 0x05},	/* VSEN13 */
  	{0x06, 0x06},	/* VSEN14 */
  	{0x06, 0x07},	/* VSEN15 */
  	{0x06, 0x08},	/* VSEN16 */
  	{0x06, 0x09},	/* VSEN17 */
  };

  #define W83795_REG_FAN(index)		(0x2E + (index))
  #define W83795_REG_FAN_MIN_HL(index)	(0xB6 + (index))
  #define W83795_REG_FAN_MIN_LSB(index)	(0xC4 + (index) / 2)
  #define W83795_REG_FAN_MIN_LSB_SHIFT(index) \

  	(((index) & 1) ? 4 : 0)

  
  #define W83795_REG_VID_CTRL		0x6A

  #define W83795_REG_ALARM_CTRL		0x40
  #define ALARM_CTRL_RTSACS		(1 << 7)

  #define W83795_REG_ALARM(index)		(0x41 + (index))

  #define W83795_REG_CLR_CHASSIS		0x4D

  #define W83795_REG_BEEP(index)		(0x50 + (index))

  #define W83795_REG_OVT_CFG		0x58
  #define OVT_CFG_SEL			(1 << 7)

  #define W83795_REG_FCMS1		0x201
  #define W83795_REG_FCMS2		0x208
  #define W83795_REG_TFMR(index)		(0x202 + (index))
  #define W83795_REG_FOMC			0x20F

  
  #define W83795_REG_TSS(index)		(0x209 + (index))

  #define TSS_MAP_RESERVED		0xff
  static const u8 tss_map[4][6] = {
  	{ 0,  1,  2,  3,  4,  5},
  	{ 6,  7,  8,  9,  0,  1},
  	{10, 11, 12, 13,  2,  3},
  	{ 4,  5,  4,  5, TSS_MAP_RESERVED, TSS_MAP_RESERVED},
  };

  #define PWM_OUTPUT			0

  #define PWM_FREQ			1
  #define PWM_START			2
  #define PWM_NONSTOP			3
  #define PWM_STOP_TIME			4
  #define W83795_REG_PWM(index, nr)	(0x210 + (nr) * 8 + (index))

  #define W83795_REG_FTSH(index)		(0x240 + (index) * 2)
  #define W83795_REG_FTSL(index)		(0x241 + (index) * 2)
  #define W83795_REG_TFTS			0x250
  
  #define TEMP_PWM_TTTI			0
  #define TEMP_PWM_CTFS			1
  #define TEMP_PWM_HCT			2
  #define TEMP_PWM_HOT			3
  #define W83795_REG_TTTI(index)		(0x260 + (index))
  #define W83795_REG_CTFS(index)		(0x268 + (index))
  #define W83795_REG_HT(index)		(0x270 + (index))
  
  #define SF4_TEMP			0
  #define SF4_PWM				1
  #define W83795_REG_SF4_TEMP(temp_num, index) \
  	(0x280 + 0x10 * (temp_num) + (index))
  #define W83795_REG_SF4_PWM(temp_num, index) \
  	(0x288 + 0x10 * (temp_num) + (index))
  
  #define W83795_REG_DTSC			0x301
  #define W83795_REG_DTSE			0x302
  #define W83795_REG_DTS(index)		(0x26 + (index))

  #define W83795_REG_PECI_TBASE(index)	(0x320 + (index))

  
  #define DTS_CRIT			0
  #define DTS_CRIT_HYST			1
  #define DTS_WARN			2
  #define DTS_WARN_HYST			3
  #define W83795_REG_DTS_EXT(index)	(0xB2 + (index))
  
  #define SETUP_PWM_DEFAULT		0
  #define SETUP_PWM_UPTIME		1
  #define SETUP_PWM_DOWNTIME		2
  #define W83795_REG_SETUP_PWM(index)    (0x20C + (index))
  
  static inline u16 in_from_reg(u8 index, u16 val)
  {

  	/* 3VDD, 3VSB and VBAT: 6 mV/bit; other inputs: 2 mV/bit */
  	if (index >= 12 && index <= 14)

  		return val * 6;
  	else
  		return val * 2;
  }
  
  static inline u16 in_to_reg(u8 index, u16 val)
  {

  	if (index >= 12 && index <= 14)

  		return val / 6;
  	else
  		return val / 2;
  }
  
  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 SENSORS_LIMIT((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 SENSORS_LIMIT((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 SENSORS_LIMIT(val / 1000, min, max);

  }

  static const u16 pwm_freq_cksel0[16] = {
  	1024, 512, 341, 256, 205, 171, 146, 128,
  	85, 64, 32, 16, 8, 4, 2, 1
  };
  
  static unsigned int pwm_freq_from_reg(u8 reg, u16 clkin)
  {
  	unsigned long base_clock;
  
  	if (reg & 0x80) {
  		base_clock = clkin * 1000 / ((clkin == 48000) ? 384 : 256);
  		return base_clock / ((reg & 0x7f) + 1);
  	} else
  		return pwm_freq_cksel0[reg & 0x0f];
  }
  
  static u8 pwm_freq_to_reg(unsigned long val, u16 clkin)
  {
  	unsigned long base_clock;
  	u8 reg0, reg1;
  	unsigned long best0, best1;
  
  	/* Best fit for cksel = 0 */
  	for (reg0 = 0; reg0 < ARRAY_SIZE(pwm_freq_cksel0) - 1; reg0++) {
  		if (val > (pwm_freq_cksel0[reg0] +
  			   pwm_freq_cksel0[reg0 + 1]) / 2)
  			break;
  	}
  	if (val < 375)	/* cksel = 1 can't beat this */
  		return reg0;
  	best0 = pwm_freq_cksel0[reg0];
  
  	/* Best fit for cksel = 1 */
  	base_clock = clkin * 1000 / ((clkin == 48000) ? 384 : 256);
  	reg1 = SENSORS_LIMIT(DIV_ROUND_CLOSEST(base_clock, val), 1, 128);
  	best1 = base_clock / reg1;
  	reg1 = 0x80 | (reg1 - 1);
  
  	/* Choose the closest one */
  	if (abs(val - best0) > abs(val - best1))
  		return reg1;
  	else
  		return reg0;
  }

  
  enum chip_types {w83795g, w83795adg};
  
  struct w83795_data {
  	struct device *hwmon_dev;
  	struct mutex update_lock;
  	unsigned long last_updated;	/* In jiffies */
  	enum chip_types chip_type;
  
  	u8 bank;
  
  	u32 has_in;		/* Enable monitor VIN or not */

  	u8 has_dyn_in;		/* Only in2-0 can have this */

  	u16 in[21][3];		/* Register value, read/high/low */
  	u8 in_lsb[10][3];	/* LSB Register value, high/low */
  	u8 has_gain;		/* has gain: in17-20 * 8 */
  
  	u16 has_fan;		/* Enable fan14-1 or not */
  	u16 fan[14];		/* Register value combine */
  	u16 fan_min[14];	/* Register value combine */
  
  	u8 has_temp;		/* Enable monitor temp6-1 or not */

  	s8 temp[6][5];		/* current, crit, crit_hyst, warn, warn_hyst */

  	u8 temp_read_vrlsb[6];

  	u8 temp_mode;		/* Bit vector, 0 = TR, 1 = TD */

  	u8 temp_src[3];		/* Register value */
  
  	u8 enable_dts;		/* Enable PECI and SB-TSI,
  				 * bit 0: =1 enable, =0 disable,
  				 * bit 1: =1 AMD SB-TSI, =0 Intel PECI */
  	u8 has_dts;		/* Enable monitor DTS temp */

  	s8 dts[8];		/* Register value */

  	u8 dts_read_vrlsb[8];	/* Register value */

  	s8 dts_ext[4];		/* Register value */

  
  	u8 has_pwm;		/* 795g supports 8 pwm, 795adg only supports 2,
  				 * no config register, only affected by chip
  				 * type */

  	u8 pwm[8][5];		/* Register value, output, freq, start,
  				 *  non stop, stop time */

  	u16 clkin;		/* CLKIN frequency in kHz */

  	u8 pwm_fcms[2];		/* Register value */
  	u8 pwm_tfmr[6];		/* Register value */
  	u8 pwm_fomc;		/* Register value */
  
  	u16 target_speed[8];	/* Register value, target speed for speed
  				 * cruise */
  	u8 tol_speed;		/* tolerance of target speed */
  	u8 pwm_temp[6][4];	/* TTTI, CTFS, HCT, HOT */
  	u8 sf4_reg[6][2][7];	/* 6 temp, temp/dcpwm, 7 registers */
  
  	u8 setup_pwm[3];	/* Register value */
  
  	u8 alarms[6];		/* Register value */

  	u8 enable_beep;

  	u8 beeps[6];		/* Register value */

  
  	char valid;

  	char valid_limits;

  	char valid_pwm_config;

  };
  
  /*
   * Hardware access

   * We assume that nobdody can change the bank outside the driver.

   */

  /* Must be called with data->update_lock held, except during initialization */
  static int w83795_set_bank(struct i2c_client *client, u8 bank)

  {
  	struct w83795_data *data = i2c_get_clientdata(client);

  	int err;
  
  	/* If the same bank is already set, nothing to do */
  	if ((data->bank & 0x07) == bank)
  		return 0;
  
  	/* Change to new bank, preserve all other bits */
  	bank |= data->bank & ~0x07;
  	err = i2c_smbus_write_byte_data(client, W83795_REG_BANKSEL, bank);
  	if (err < 0) {
  		dev_err(&client->dev,
  			"Failed to set bank to %d, err %d
  ",
  			(int)bank, err);
  		return err;

  	}

  	data->bank = bank;
  
  	return 0;

  }
  
  /* Must be called with data->update_lock held, except during initialization */

  static u8 w83795_read(struct i2c_client *client, u16 reg)

  {

  	int err;
  
  	err = w83795_set_bank(client, reg >> 8);
  	if (err < 0)
  		return 0x00;	/* Arbitrary */
  
  	err = i2c_smbus_read_byte_data(client, reg & 0xff);
  	if (err < 0) {
  		dev_err(&client->dev,
  			"Failed to read from register 0x%03x, err %d
  ",
  			(int)reg, err);
  		return 0x00;	/* Arbitrary */

  	}

  	return err;
  }

  /* Must be called with data->update_lock held, except during initialization */
  static int w83795_write(struct i2c_client *client, u16 reg, u8 value)
  {
  	int err;
  
  	err = w83795_set_bank(client, reg >> 8);
  	if (err < 0)
  		return err;
  
  	err = i2c_smbus_write_byte_data(client, reg & 0xff, value);
  	if (err < 0)
  		dev_err(&client->dev,
  			"Failed to write to register 0x%03x, err %d
  ",
  			(int)reg, err);
  	return err;

  }

  static void w83795_update_limits(struct i2c_client *client)
  {
  	struct w83795_data *data = i2c_get_clientdata(client);
  	int i, limit;

  	u8 lsb;

  
  	/* Read the voltage limits */
  	for (i = 0; i < ARRAY_SIZE(data->in); i++) {
  		if (!(data->has_in & (1 << i)))
  			continue;
  		data->in[i][IN_MAX] =
  			w83795_read(client, W83795_REG_IN[i][IN_MAX]);
  		data->in[i][IN_LOW] =
  			w83795_read(client, W83795_REG_IN[i][IN_LOW]);
  	}
  	for (i = 0; i < ARRAY_SIZE(data->in_lsb); i++) {
  		if ((i == 2 && data->chip_type == w83795adg) ||
  		    (i >= 4 && !(data->has_in & (1 << (i + 11)))))
  			continue;
  		data->in_lsb[i][IN_MAX] =
  			w83795_read(client, IN_LSB_REG(i, IN_MAX));
  		data->in_lsb[i][IN_LOW] =
  			w83795_read(client, IN_LSB_REG(i, IN_LOW));
  	}
  
  	/* Read the fan limits */

  	lsb = 0; /* Silent false gcc warning */

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

  		/* Each register contains LSB for 2 fans, but we want to
  		 * read it only once to save time */
  		if ((i & 1) == 0 && (data->has_fan & (3 << i)))
  			lsb = w83795_read(client, W83795_REG_FAN_MIN_LSB(i));
  
  		if (!(data->has_fan & (1 << i)))
  			continue;
  		data->fan_min[i] =
  			w83795_read(client, W83795_REG_FAN_MIN_HL(i)) << 4;
  		data->fan_min[i] |=
  			(lsb >> W83795_REG_FAN_MIN_LSB_SHIFT(i)) & 0x0F;
  	}
  
  	/* Read the temperature limits */
  	for (i = 0; i < ARRAY_SIZE(data->temp); i++) {
  		if (!(data->has_temp & (1 << i)))
  			continue;
  		for (limit = TEMP_CRIT; limit <= TEMP_WARN_HYST; limit++)
  			data->temp[i][limit] =
  				w83795_read(client, W83795_REG_TEMP[i][limit]);
  	}
  
  	/* Read the DTS limits */

  	if (data->enable_dts) {

  		for (limit = DTS_CRIT; limit <= DTS_WARN_HYST; limit++)
  			data->dts_ext[limit] =
  				w83795_read(client, W83795_REG_DTS_EXT(limit));
  	}
  
  	/* Read beep settings */

  	if (data->enable_beep) {
  		for (i = 0; i < ARRAY_SIZE(data->beeps); i++)
  			data->beeps[i] =
  				w83795_read(client, W83795_REG_BEEP(i));
  	}

  
  	data->valid_limits = 1;

  }

  static struct w83795_data *w83795_update_pwm_config(struct device *dev)

  {

  	struct i2c_client *client = to_i2c_client(dev);

  	struct w83795_data *data = i2c_get_clientdata(client);
  	int i, tmp;

  	mutex_lock(&data->update_lock);
  
  	if (data->valid_pwm_config)
  		goto END;

  	/* Read temperature source selection */
  	for (i = 0; i < ARRAY_SIZE(data->temp_src); i++)
  		data->temp_src[i] = w83795_read(client, W83795_REG_TSS(i));
  
  	/* Read automatic fan speed control settings */
  	data->pwm_fcms[0] = w83795_read(client, W83795_REG_FCMS1);
  	data->pwm_fcms[1] = w83795_read(client, W83795_REG_FCMS2);
  	for (i = 0; i < ARRAY_SIZE(data->pwm_tfmr); i++)
  		data->pwm_tfmr[i] = w83795_read(client, W83795_REG_TFMR(i));
  	data->pwm_fomc = w83795_read(client, W83795_REG_FOMC);
  	for (i = 0; i < data->has_pwm; i++) {
  		for (tmp = PWM_FREQ; tmp <= PWM_STOP_TIME; tmp++)
  			data->pwm[i][tmp] =
  				w83795_read(client, W83795_REG_PWM(i, tmp));
  	}
  	for (i = 0; i < ARRAY_SIZE(data->target_speed); i++) {
  		data->target_speed[i] =
  			w83795_read(client, W83795_REG_FTSH(i)) << 4;
  		data->target_speed[i] |=
  			w83795_read(client, W83795_REG_FTSL(i)) >> 4;
  	}
  	data->tol_speed = w83795_read(client, W83795_REG_TFTS) & 0x3f;
  
  	for (i = 0; i < ARRAY_SIZE(data->pwm_temp); i++) {
  		data->pwm_temp[i][TEMP_PWM_TTTI] =
  			w83795_read(client, W83795_REG_TTTI(i)) & 0x7f;
  		data->pwm_temp[i][TEMP_PWM_CTFS] =
  			w83795_read(client, W83795_REG_CTFS(i));
  		tmp = w83795_read(client, W83795_REG_HT(i));

  		data->pwm_temp[i][TEMP_PWM_HCT] = tmp >> 4;

  		data->pwm_temp[i][TEMP_PWM_HOT] = tmp & 0x0f;
  	}
  
  	/* Read SmartFanIV trip points */
  	for (i = 0; i < ARRAY_SIZE(data->sf4_reg); i++) {
  		for (tmp = 0; tmp < 7; tmp++) {
  			data->sf4_reg[i][SF4_TEMP][tmp] =
  				w83795_read(client,
  					    W83795_REG_SF4_TEMP(i, tmp));
  			data->sf4_reg[i][SF4_PWM][tmp] =
  				w83795_read(client, W83795_REG_SF4_PWM(i, tmp));
  		}
  	}
  
  	/* Read setup PWM */
  	for (i = 0; i < ARRAY_SIZE(data->setup_pwm); i++)
  		data->setup_pwm[i] =
  			w83795_read(client, W83795_REG_SETUP_PWM(i));

  
  	data->valid_pwm_config = 1;
  
  END:
  	mutex_unlock(&data->update_lock);
  	return data;

  }

  static struct w83795_data *w83795_update_device(struct device *dev)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct w83795_data *data = i2c_get_clientdata(client);
  	u16 tmp;

  	u8 intrusion;

  	int i;
  
  	mutex_lock(&data->update_lock);

  	if (!data->valid_limits)
  		w83795_update_limits(client);

  	if (!(time_after(jiffies, data->last_updated + HZ * 2)
  	      || !data->valid))
  		goto END;
  
  	/* Update the voltages value */
  	for (i = 0; i < ARRAY_SIZE(data->in); i++) {
  		if (!(data->has_in & (1 << i)))
  			continue;
  		tmp = w83795_read(client, W83795_REG_IN[i][IN_READ]) << 2;

  		tmp |= w83795_read(client, W83795_REG_VRLSB) >> 6;

  		data->in[i][IN_READ] = tmp;
  	}

  	/* in0-2 can have dynamic limits (W83795G only) */
  	if (data->has_dyn_in) {
  		u8 lsb_max = w83795_read(client, IN_LSB_REG(0, IN_MAX));
  		u8 lsb_low = w83795_read(client, IN_LSB_REG(0, IN_LOW));
  
  		for (i = 0; i < 3; i++) {
  			if (!(data->has_dyn_in & (1 << i)))
  				continue;
  			data->in[i][IN_MAX] =
  				w83795_read(client, W83795_REG_IN[i][IN_MAX]);
  			data->in[i][IN_LOW] =
  				w83795_read(client, W83795_REG_IN[i][IN_LOW]);
  			data->in_lsb[i][IN_MAX] = (lsb_max >> (2 * i)) & 0x03;
  			data->in_lsb[i][IN_LOW] = (lsb_low >> (2 * i)) & 0x03;
  		}
  	}

  	/* Update fan */
  	for (i = 0; i < ARRAY_SIZE(data->fan); i++) {
  		if (!(data->has_fan & (1 << i)))
  			continue;
  		data->fan[i] = w83795_read(client, W83795_REG_FAN(i)) << 4;

  		data->fan[i] |= w83795_read(client, W83795_REG_VRLSB) >> 4;

  	}
  
  	/* Update temperature */
  	for (i = 0; i < ARRAY_SIZE(data->temp); i++) {

  		data->temp[i][TEMP_READ] =
  			w83795_read(client, W83795_REG_TEMP[i][TEMP_READ]);
  		data->temp_read_vrlsb[i] =
  			w83795_read(client, W83795_REG_VRLSB);
  	}
  
  	/* Update dts temperature */

  	if (data->enable_dts) {

  		for (i = 0; i < ARRAY_SIZE(data->dts); i++) {
  			if (!(data->has_dts & (1 << i)))
  				continue;
  			data->dts[i] =
  				w83795_read(client, W83795_REG_DTS(i));
  			data->dts_read_vrlsb[i] =
  				w83795_read(client, W83795_REG_VRLSB);
  		}
  	}
  
  	/* Update pwm output */
  	for (i = 0; i < data->has_pwm; i++) {
  		data->pwm[i][PWM_OUTPUT] =
  		    w83795_read(client, W83795_REG_PWM(i, PWM_OUTPUT));
  	}

  	/* Update intrusion and alarms
  	 * It is important to read intrusion first, because reading from
  	 * register SMI STS6 clears the interrupt status temporarily. */
  	tmp = w83795_read(client, W83795_REG_ALARM_CTRL);
  	/* Switch to interrupt status for intrusion if needed */
  	if (tmp & ALARM_CTRL_RTSACS)
  		w83795_write(client, W83795_REG_ALARM_CTRL,
  			     tmp & ~ALARM_CTRL_RTSACS);
  	intrusion = w83795_read(client, W83795_REG_ALARM(5)) & (1 << 6);
  	/* Switch to real-time alarms */
  	w83795_write(client, W83795_REG_ALARM_CTRL, tmp | ALARM_CTRL_RTSACS);

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

  		data->alarms[i] = w83795_read(client, W83795_REG_ALARM(i));

  	data->alarms[5] |= intrusion;
  	/* Restore original configuration if needed */
  	if (!(tmp & ALARM_CTRL_RTSACS))
  		w83795_write(client, W83795_REG_ALARM_CTRL,
  			     tmp & ~ALARM_CTRL_RTSACS);

  
  	data->last_updated = jiffies;
  	data->valid = 1;
  
  END:
  	mutex_unlock(&data->update_lock);
  	return data;
  }
  
  /*
   * Sysfs attributes
   */
  
  #define ALARM_STATUS      0
  #define BEEP_ENABLE       1
  static ssize_t
  show_alarm_beep(struct device *dev, struct device_attribute *attr, char *buf)
  {
  	struct w83795_data *data = w83795_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 w83795_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;

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

  		return -EINVAL;
  	if (val != 0 && val != 1)
  		return -EINVAL;
  
  	mutex_lock(&data->update_lock);
  	data->beeps[index] = w83795_read(client, W83795_REG_BEEP(index));
  	data->beeps[index] &= ~beep_bit;
  	data->beeps[index] |= val << shift;
  	w83795_write(client, W83795_REG_BEEP(index), data->beeps[index]);
  	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 w83795_data *data = i2c_get_clientdata(client);

  	unsigned long val;

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

  		return -EINVAL;

  
  	mutex_lock(&data->update_lock);
  	val = w83795_read(client, W83795_REG_CLR_CHASSIS);
  	val |= 0x80;
  	w83795_write(client, W83795_REG_CLR_CHASSIS, val);

  
  	/* Clear status and force cache refresh */
  	w83795_read(client, W83795_REG_ALARM(5));
  	data->valid = 0;

  	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 w83795_data *data = w83795_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 w83795_data *data = i2c_get_clientdata(client);
  	unsigned long val;

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

  		return -EINVAL;
  	val = fan_to_reg(val);
  
  	mutex_lock(&data->update_lock);
  	data->fan_min[index] = val;
  	w83795_write(client, W83795_REG_FAN_MIN_HL(index), (val >> 4) & 0xff);
  	val &= 0x0f;

  	if (index & 1) {

  		val <<= 4;
  		val |= w83795_read(client, W83795_REG_FAN_MIN_LSB(index))
  		       & 0x0f;
  	} else {
  		val |= w83795_read(client, W83795_REG_FAN_MIN_LSB(index))
  		       & 0xf0;
  	}
  	w83795_write(client, W83795_REG_FAN_MIN_LSB(index), val & 0xff);
  	mutex_unlock(&data->update_lock);
  
  	return count;
  }
  
  static ssize_t
  show_pwm(struct device *dev, struct device_attribute *attr, char *buf)
  {

  	struct w83795_data *data;

  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int nr = sensor_attr->nr;
  	int index = sensor_attr->index;

  	unsigned int val;

  	data = nr == PWM_OUTPUT ? w83795_update_device(dev)
  				: w83795_update_pwm_config(dev);

  	switch (nr) {
  	case PWM_STOP_TIME:
  		val = time_from_reg(data->pwm[index][nr]);
  		break;

  	case PWM_FREQ:
  		val = pwm_freq_from_reg(data->pwm[index][nr], data->clkin);

  		break;
  	default:
  		val = data->pwm[index][nr];
  		break;
  	}
  
  	return sprintf(buf, "%u
  ", 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 w83795_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;

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

  		return -EINVAL;
  
  	mutex_lock(&data->update_lock);
  	switch (nr) {
  	case PWM_STOP_TIME:
  		val = time_to_reg(val);
  		break;

  	case PWM_FREQ:
  		val = pwm_freq_to_reg(val, data->clkin);

  		break;
  	default:
  		val = SENSORS_LIMIT(val, 0, 0xff);
  		break;
  	}
  	w83795_write(client, W83795_REG_PWM(index, nr), val);

  	data->pwm[index][nr] = val;

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

  }
  
  static ssize_t
  show_pwm_enable(struct device *dev, struct device_attribute *attr, char *buf)
  {
  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);

  	struct w83795_data *data = w83795_update_pwm_config(dev);

  	int index = sensor_attr->index;
  	u8 tmp;

  	/* Speed cruise mode */
  	if (data->pwm_fcms[0] & (1 << index)) {

  		tmp = 2;
  		goto out;
  	}

  	/* Thermal cruise or SmartFan IV mode */

  	for (tmp = 0; tmp < 6; tmp++) {
  		if (data->pwm_tfmr[tmp] & (1 << index)) {
  			tmp = 3;
  			goto out;
  		}
  	}

  	/* Manual mode */
  	tmp = 1;

  
  out:
  	return sprintf(buf, "%u
  ", tmp);
  }
  
  static ssize_t
  store_pwm_enable(struct device *dev, struct device_attribute *attr,
  	  const char *buf, size_t count)
  {
  	struct i2c_client *client = to_i2c_client(dev);

  	struct w83795_data *data = w83795_update_pwm_config(dev);

  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int index = sensor_attr->index;
  	unsigned long val;
  	int i;

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

  		return -EINVAL;

  	if (val < 1 || val > 2)

  		return -EINVAL;
  
  	mutex_lock(&data->update_lock);
  	switch (val) {

  	case 1:

  		/* Clear speed cruise mode bits */

  		data->pwm_fcms[0] &= ~(1 << index);
  		w83795_write(client, W83795_REG_FCMS1, data->pwm_fcms[0]);

  		/* Clear thermal cruise mode bits */

  		for (i = 0; i < 6; i++) {
  			data->pwm_tfmr[i] &= ~(1 << index);
  			w83795_write(client, W83795_REG_TFMR(i),
  				data->pwm_tfmr[i]);
  		}

  		break;
  	case 2:
  		data->pwm_fcms[0] |= (1 << index);
  		w83795_write(client, W83795_REG_FCMS1, data->pwm_fcms[0]);
  		break;
  	}
  	mutex_unlock(&data->update_lock);
  	return count;

  }
  
  static ssize_t

  show_pwm_mode(struct device *dev, struct device_attribute *attr, char *buf)
  {
  	struct w83795_data *data = w83795_update_pwm_config(dev);
  	int index = to_sensor_dev_attr_2(attr)->index;
  	unsigned int mode;
  
  	if (data->pwm_fomc & (1 << index))
  		mode = 0;	/* DC */
  	else
  		mode = 1;	/* PWM */
  
  	return sprintf(buf, "%u
  ", mode);
  }

  /*
   * Check whether a given temperature source can ever be useful.
   * Returns the number of selectable temperature channels which are
   * enabled.
   */
  static int w83795_tss_useful(const struct w83795_data *data, int tsrc)
  {
  	int useful = 0, i;
  
  	for (i = 0; i < 4; i++) {
  		if (tss_map[i][tsrc] == TSS_MAP_RESERVED)
  			continue;
  		if (tss_map[i][tsrc] < 6)	/* Analog */
  			useful += (data->has_temp >> tss_map[i][tsrc]) & 1;
  		else				/* Digital */
  			useful += (data->has_dts >> (tss_map[i][tsrc] - 6)) & 1;
  	}
  
  	return useful;
  }

  static ssize_t

  show_temp_src(struct device *dev, struct device_attribute *attr, char *buf)
  {
  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);

  	struct w83795_data *data = w83795_update_pwm_config(dev);

  	int index = sensor_attr->index;

  	u8 tmp = data->temp_src[index / 2];

  	if (index & 1)

  		tmp >>= 4;	/* Pick high nibble */

  	else

  		tmp &= 0x0f;	/* Pick low nibble */

  	/* Look-up the actual temperature channel number */
  	if (tmp >= 4 || tss_map[tmp][index] == TSS_MAP_RESERVED)
  		return -EINVAL;		/* Shouldn't happen */
  
  	return sprintf(buf, "%u
  ", (unsigned int)tss_map[tmp][index] + 1);

  }
  
  static ssize_t
  store_temp_src(struct device *dev, struct device_attribute *attr,
  	  const char *buf, size_t count)
  {
  	struct i2c_client *client = to_i2c_client(dev);

  	struct w83795_data *data = w83795_update_pwm_config(dev);

  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int index = sensor_attr->index;

  	int tmp;
  	unsigned long channel;

  	u8 val = index / 2;

  	if (kstrtoul(buf, 10, &channel) < 0 ||

  	    channel < 1 || channel > 14)
  		return -EINVAL;
  
  	/* Check if request can be fulfilled */
  	for (tmp = 0; tmp < 4; tmp++) {
  		if (tss_map[tmp][index] == channel - 1)
  			break;
  	}
  	if (tmp == 4)	/* No match */

  		return -EINVAL;

  
  	mutex_lock(&data->update_lock);

  	if (index & 1) {

  		tmp <<= 4;
  		data->temp_src[val] &= 0x0f;
  	} else {
  		data->temp_src[val] &= 0xf0;
  	}
  	data->temp_src[val] |= tmp;
  	w83795_write(client, W83795_REG_TSS(val), data->temp_src[val]);
  	mutex_unlock(&data->update_lock);
  
  	return count;
  }
  
  #define TEMP_PWM_ENABLE   0
  #define TEMP_PWM_FAN_MAP  1
  static ssize_t
  show_temp_pwm_enable(struct device *dev, struct device_attribute *attr,
  		     char *buf)
  {

  	struct w83795_data *data = w83795_update_pwm_config(dev);

  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int nr = sensor_attr->nr;
  	int index = sensor_attr->index;
  	u8 tmp = 0xff;
  
  	switch (nr) {
  	case TEMP_PWM_ENABLE:
  		tmp = (data->pwm_fcms[1] >> index) & 1;
  		if (tmp)
  			tmp = 4;
  		else
  			tmp = 3;
  		break;
  	case TEMP_PWM_FAN_MAP:
  		tmp = data->pwm_tfmr[index];
  		break;
  	}
  
  	return sprintf(buf, "%u
  ", tmp);
  }
  
  static ssize_t
  store_temp_pwm_enable(struct device *dev, struct device_attribute *attr,
  	  const char *buf, size_t count)
  {
  	struct i2c_client *client = to_i2c_client(dev);

  	struct w83795_data *data = w83795_update_pwm_config(dev);

  	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 tmp;

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

  		return -EINVAL;
  
  	switch (nr) {
  	case TEMP_PWM_ENABLE:

  		if (tmp != 3 && tmp != 4)

  			return -EINVAL;
  		tmp -= 3;
  		mutex_lock(&data->update_lock);
  		data->pwm_fcms[1] &= ~(1 << index);
  		data->pwm_fcms[1] |= tmp << index;
  		w83795_write(client, W83795_REG_FCMS2, data->pwm_fcms[1]);
  		mutex_unlock(&data->update_lock);
  		break;
  	case TEMP_PWM_FAN_MAP:
  		mutex_lock(&data->update_lock);
  		tmp = SENSORS_LIMIT(tmp, 0, 0xff);
  		w83795_write(client, W83795_REG_TFMR(index), tmp);
  		data->pwm_tfmr[index] = tmp;
  		mutex_unlock(&data->update_lock);
  		break;
  	}
  	return count;
  }
  
  #define FANIN_TARGET   0
  #define FANIN_TOL      1
  static ssize_t
  show_fanin(struct device *dev, struct device_attribute *attr, char *buf)
  {

  	struct w83795_data *data = w83795_update_pwm_config(dev);

  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int nr = sensor_attr->nr;
  	int index = sensor_attr->index;
  	u16 tmp = 0;
  
  	switch (nr) {
  	case FANIN_TARGET:
  		tmp = fan_from_reg(data->target_speed[index]);
  		break;
  	case FANIN_TOL:
  		tmp = data->tol_speed;
  		break;
  	}
  
  	return sprintf(buf, "%u
  ", tmp);
  }
  
  static ssize_t
  store_fanin(struct device *dev, struct device_attribute *attr,
  	  const char *buf, size_t count)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct w83795_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;

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

  		return -EINVAL;
  
  	mutex_lock(&data->update_lock);
  	switch (nr) {
  	case FANIN_TARGET:
  		val = fan_to_reg(SENSORS_LIMIT(val, 0, 0xfff));

  		w83795_write(client, W83795_REG_FTSH(index), val >> 4);

  		w83795_write(client, W83795_REG_FTSL(index), (val << 4) & 0xf0);
  		data->target_speed[index] = val;
  		break;
  	case FANIN_TOL:
  		val = SENSORS_LIMIT(val, 0, 0x3f);
  		w83795_write(client, W83795_REG_TFTS, val);
  		data->tol_speed = val;
  		break;
  	}
  	mutex_unlock(&data->update_lock);
  
  	return count;
  }
  
  
  static ssize_t
  show_temp_pwm(struct device *dev, struct device_attribute *attr, char *buf)
  {

  	struct w83795_data *data = w83795_update_pwm_config(dev);

  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int nr = sensor_attr->nr;
  	int index = sensor_attr->index;
  	long tmp = temp_from_reg(data->pwm_temp[index][nr]);
  
  	return sprintf(buf, "%ld
  ", tmp);
  }
  
  static ssize_t
  store_temp_pwm(struct device *dev, struct device_attribute *attr,
  	  const char *buf, size_t count)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct w83795_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;
  	u8 tmp;

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

  		return -EINVAL;
  	val /= 1000;
  
  	mutex_lock(&data->update_lock);
  	switch (nr) {
  	case TEMP_PWM_TTTI:
  		val = SENSORS_LIMIT(val, 0, 0x7f);
  		w83795_write(client, W83795_REG_TTTI(index), val);
  		break;
  	case TEMP_PWM_CTFS:
  		val = SENSORS_LIMIT(val, 0, 0x7f);
  		w83795_write(client, W83795_REG_CTFS(index), val);
  		break;
  	case TEMP_PWM_HCT:
  		val = SENSORS_LIMIT(val, 0, 0x0f);
  		tmp = w83795_read(client, W83795_REG_HT(index));
  		tmp &= 0x0f;
  		tmp |= (val << 4) & 0xf0;
  		w83795_write(client, W83795_REG_HT(index), tmp);
  		break;
  	case TEMP_PWM_HOT:
  		val = SENSORS_LIMIT(val, 0, 0x0f);
  		tmp = w83795_read(client, W83795_REG_HT(index));
  		tmp &= 0xf0;
  		tmp |= val & 0x0f;
  		w83795_write(client, W83795_REG_HT(index), tmp);
  		break;
  	}
  	data->pwm_temp[index][nr] = val;
  	mutex_unlock(&data->update_lock);
  
  	return count;
  }
  
  static ssize_t
  show_sf4_pwm(struct device *dev, struct device_attribute *attr, char *buf)
  {

  	struct w83795_data *data = w83795_update_pwm_config(dev);

  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int nr = sensor_attr->nr;
  	int index = sensor_attr->index;
  
  	return sprintf(buf, "%u
  ", data->sf4_reg[index][SF4_PWM][nr]);
  }
  
  static ssize_t
  store_sf4_pwm(struct device *dev, struct device_attribute *attr,
  	  const char *buf, size_t count)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct w83795_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;

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

  		return -EINVAL;
  
  	mutex_lock(&data->update_lock);
  	w83795_write(client, W83795_REG_SF4_PWM(index, nr), val);
  	data->sf4_reg[index][SF4_PWM][nr] = val;
  	mutex_unlock(&data->update_lock);
  
  	return count;
  }
  
  static ssize_t
  show_sf4_temp(struct device *dev, struct device_attribute *attr, char *buf)
  {

  	struct w83795_data *data = w83795_update_pwm_config(dev);

  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int nr = sensor_attr->nr;
  	int index = sensor_attr->index;
  
  	return sprintf(buf, "%u
  ",
  		(data->sf4_reg[index][SF4_TEMP][nr]) * 1000);
  }
  
  static ssize_t
  store_sf4_temp(struct device *dev, struct device_attribute *attr,
  	  const char *buf, size_t count)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct w83795_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;

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

  		return -EINVAL;
  	val /= 1000;
  
  	mutex_lock(&data->update_lock);
  	w83795_write(client, W83795_REG_SF4_TEMP(index, nr), val);
  	data->sf4_reg[index][SF4_TEMP][nr] = val;
  	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 w83795_data *data = w83795_update_device(dev);

  	long temp = temp_from_reg(data->temp[index][nr]);

  	if (nr == TEMP_READ)

  		temp += (data->temp_read_vrlsb[index] >> 6) * 250;

  	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 w83795_data *data = i2c_get_clientdata(client);
  	long tmp;

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

  		return -EINVAL;
  
  	mutex_lock(&data->update_lock);
  	data->temp[index][nr] = temp_to_reg(tmp, -128, 127);
  	w83795_write(client, W83795_REG_TEMP[index][nr], data->temp[index][nr]);
  	mutex_unlock(&data->update_lock);
  	return count;
  }
  
  
  static ssize_t
  show_dts_mode(struct device *dev, struct device_attribute *attr, char *buf)
  {

  	struct w83795_data *data = dev_get_drvdata(dev);

  	int tmp;

  	if (data->enable_dts & 2)
  		tmp = 5;
  	else
  		tmp = 6;

  
  	return sprintf(buf, "%d
  ", tmp);
  }
  
  static ssize_t
  show_dts(struct device *dev, struct device_attribute *attr, char *buf)
  {
  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int index = sensor_attr->index;
  	struct w83795_data *data = w83795_update_device(dev);

  	long temp = temp_from_reg(data->dts[index]);

  	temp += (data->dts_read_vrlsb[index] >> 6) * 250;

  	return sprintf(buf, "%ld
  ", temp);
  }
  
  static ssize_t
  show_dts_ext(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 w83795_data *data = dev_get_drvdata(dev);

  	long temp = temp_from_reg(data->dts_ext[nr]);

  	return sprintf(buf, "%ld
  ", temp);
  }
  
  static ssize_t
  store_dts_ext(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 w83795_data *data = i2c_get_clientdata(client);
  	long tmp;

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

  		return -EINVAL;
  
  	mutex_lock(&data->update_lock);
  	data->dts_ext[nr] = temp_to_reg(tmp, -128, 127);
  	w83795_write(client, W83795_REG_DTS_EXT(nr), data->dts_ext[nr]);
  	mutex_unlock(&data->update_lock);
  	return count;
  }

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

  	struct w83795_data *data = dev_get_drvdata(dev);

  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int index = sensor_attr->index;

  	int tmp;

  	if (data->temp_mode & (1 << index))
  		tmp = 3;	/* Thermal diode */
  	else
  		tmp = 4;	/* Thermistor */

  
  	return sprintf(buf, "%d
  ", tmp);
  }

  /* Only for temp1-4 (temp5-6 can only be thermistor) */

  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 w83795_data *data = i2c_get_clientdata(client);
  	struct sensor_device_attribute_2 *sensor_attr =
  	    to_sensor_dev_attr_2(attr);
  	int index = sensor_attr->index;

  	int reg_shift;

  	unsigned long val;
  	u8 tmp;

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

  		return -EINVAL;
  	if ((val != 4) && (val != 3))
  		return -EINVAL;

  
  	mutex_lock(&data->update_lock);
  	if (val == 3) {

  		/* Thermal diode */
  		val = 0x01;

  		data->temp_mode |= 1 << index;
  	} else if (val == 4) {

  		/* Thermistor */
  		val = 0x03;
  		data->temp_mode &= ~(1 << index);

  	}

  	reg_shift = 2 * index;
  	tmp = w83795_read(client, W83795_REG_TEMP_CTRL2);
  	tmp &= ~(0x03 << reg_shift);
  	tmp |= val << reg_shift;
  	w83795_write(client, W83795_REG_TEMP_CTRL2, tmp);

  
  	mutex_unlock(&data->update_lock);
  	return count;
  }
  
  
  /* show/store VIN */
  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 w83795_data *data = w83795_update_device(dev);
  	u16 val = data->in[index][nr];
  	u8 lsb_idx;
  
  	switch (nr) {
  	case IN_READ:
  		/* calculate this value again by sensors as sensors3.conf */
  		if ((index >= 17) &&

  		    !((data->has_gain >> (index - 17)) & 1))

  			val *= 8;
  		break;
  	case IN_MAX:
  	case IN_LOW:
  		lsb_idx = IN_LSB_SHIFT_IDX[index][IN_LSB_IDX];
  		val <<= 2;
  		val |= (data->in_lsb[lsb_idx][nr] >>

  			IN_LSB_SHIFT_IDX[index][IN_LSB_SHIFT]) & 0x03;

  		if ((index >= 17) &&

  		    !((data->has_gain >> (index - 17)) & 1))

  			val *= 8;
  		break;
  	}
  	val = in_from_reg(index, val);
  
  	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 w83795_data *data = i2c_get_clientdata(client);
  	unsigned long val;
  	u8 tmp;
  	u8 lsb_idx;

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

  		return -EINVAL;
  	val = in_to_reg(index, val);
  
  	if ((index >= 17) &&

  	    !((data->has_gain >> (index - 17)) & 1))

  		val /= 8;
  	val = SENSORS_LIMIT(val, 0, 0x3FF);
  	mutex_lock(&data->update_lock);
  
  	lsb_idx = IN_LSB_SHIFT_IDX[index][IN_LSB_IDX];
  	tmp = w83795_read(client, IN_LSB_REG(lsb_idx, nr));
  	tmp &= ~(0x03 << IN_LSB_SHIFT_IDX[index][IN_LSB_SHIFT]);
  	tmp |= (val & 0x03) << IN_LSB_SHIFT_IDX[index][IN_LSB_SHIFT];
  	w83795_write(client, IN_LSB_REG(lsb_idx, nr), tmp);
  	data->in_lsb[lsb_idx][nr] = tmp;
  
  	tmp = (val >> 2) & 0xff;
  	w83795_write(client, W83795_REG_IN[index][nr], tmp);
  	data->in[index][nr] = tmp;
  
  	mutex_unlock(&data->update_lock);
  	return count;
  }

  #ifdef CONFIG_SENSORS_W83795_FANCTRL

  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 w83795_data *data = w83795_update_pwm_config(dev);

  	u16 val = data->setup_pwm[nr];
  
  	switch (nr) {
  	case SETUP_PWM_UPTIME:
  	case SETUP_PWM_DOWNTIME:
  		val = time_from_reg(val);
  		break;
  	}
  
  	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 w83795_data *data = i2c_get_clientdata(client);
  	unsigned long val;

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

  		return -EINVAL;
  
  	switch (nr) {
  	case SETUP_PWM_DEFAULT:
  		val = SENSORS_LIMIT(val, 0, 0xff);
  		break;
  	case SETUP_PWM_UPTIME:
  	case SETUP_PWM_DOWNTIME:
  		val = time_to_reg(val);
  		if (val == 0)
  			return -EINVAL;
  		break;
  	}
  
  	mutex_lock(&data->update_lock);
  	data->setup_pwm[nr] = val;
  	w83795_write(client, W83795_REG_SETUP_PWM(nr), val);
  	mutex_unlock(&data->update_lock);
  	return count;
  }

  #endif

  
  
  #define NOT_USED			-1

  /* Don't change the attribute order, _max, _min and _beep are accessed by index

   * somewhere else in the code */

  #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 > 14) ? 1 : 0)), \
  	SENSOR_ATTR_2(in##index##_beep, S_IWUSR | S_IRUGO,		\
  		show_alarm_beep, store_beep, BEEP_ENABLE,		\

  		index + ((index > 14) ? 1 : 0)) }

  /* Don't change the attribute order, _beep is accessed by index
   * somewhere else in the code */

  #define SENSOR_ATTR_FAN(index) {					\

  	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),	\
  	SENSOR_ATTR_2(fan##index##_alarm, S_IRUGO, show_alarm_beep,	\
  		NULL, ALARM_STATUS, index + 31),			\
  	SENSOR_ATTR_2(fan##index##_beep, S_IWUSR | S_IRUGO,		\

  		show_alarm_beep, store_beep, BEEP_ENABLE, index + 31) }

  #define SENSOR_ATTR_PWM(index) {					\

  	SENSOR_ATTR_2(pwm##index, S_IWUSR | S_IRUGO, show_pwm,		\
  		store_pwm, PWM_OUTPUT, 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),	 \

  	SENSOR_ATTR_2(pwm##index##_freq, S_IWUSR | S_IRUGO,	\
  		show_pwm, store_pwm, PWM_FREQ, index - 1),	 \

  	SENSOR_ATTR_2(pwm##index##_enable, S_IWUSR | S_IRUGO,		\

  		show_pwm_enable, store_pwm_enable, NOT_USED, index - 1), \

  	SENSOR_ATTR_2(pwm##index##_mode, S_IRUGO,			\
  		show_pwm_mode, NULL, NOT_USED, index - 1),		\

  	SENSOR_ATTR_2(fan##index##_target, S_IWUSR | S_IRUGO, \
  		show_fanin, store_fanin, FANIN_TARGET, index - 1) }

  /* Don't change the attribute order, _beep is accessed by index
   * somewhere else in the code */

  #define SENSOR_ATTR_DTS(index) {					\

  	SENSOR_ATTR_2(temp##index##_type, S_IRUGO ,		\
  		show_dts_mode, NULL, NOT_USED, index - 7),	\
  	SENSOR_ATTR_2(temp##index##_input, S_IRUGO, show_dts,		\
  		NULL, NOT_USED, index - 7),				\

  	SENSOR_ATTR_2(temp##index##_crit, S_IRUGO | S_IWUSR, show_dts_ext, \

  		store_dts_ext, DTS_CRIT, NOT_USED),			\

  	SENSOR_ATTR_2(temp##index##_crit_hyst, S_IRUGO | S_IWUSR,	\

  		show_dts_ext, store_dts_ext, DTS_CRIT_HYST, NOT_USED),	\

  	SENSOR_ATTR_2(temp##index##_max, S_IRUGO | S_IWUSR, show_dts_ext, \

  		store_dts_ext, DTS_WARN, NOT_USED),			\

  	SENSOR_ATTR_2(temp##index##_max_hyst, S_IRUGO | S_IWUSR,	\

  		show_dts_ext, store_dts_ext, DTS_WARN_HYST, NOT_USED),	\
  	SENSOR_ATTR_2(temp##index##_alarm, S_IRUGO,			\
  		show_alarm_beep, NULL, ALARM_STATUS, index + 17),	\
  	SENSOR_ATTR_2(temp##index##_beep, S_IWUSR | S_IRUGO,		\

  		show_alarm_beep, store_beep, BEEP_ENABLE, index + 17) }

  /* Don't change the attribute order, _beep is accessed by index
   * somewhere else in the code */

  #define SENSOR_ATTR_TEMP(index) {					\

  	SENSOR_ATTR_2(temp##index##_type, S_IRUGO | (index < 4 ? S_IWUSR : 0), \

  		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##_crit, S_IRUGO | S_IWUSR, show_temp,	\

  		store_temp, TEMP_CRIT, index - 1),			\

  	SENSOR_ATTR_2(temp##index##_crit_hyst, S_IRUGO | S_IWUSR,	\

  		show_temp, store_temp, TEMP_CRIT_HYST, index - 1),	\

  	SENSOR_ATTR_2(temp##index##_max, S_IRUGO | S_IWUSR, show_temp,	\

  		store_temp, TEMP_WARN, index - 1),			\

  	SENSOR_ATTR_2(temp##index##_max_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 + (index > 4 ? 11 : 17)),				\
  	SENSOR_ATTR_2(temp##index##_beep, S_IWUSR | S_IRUGO,		\
  		show_alarm_beep, store_beep, BEEP_ENABLE,		\
  		index + (index > 4 ? 11 : 17)),				\

  	SENSOR_ATTR_2(temp##index##_pwm_enable, S_IWUSR | S_IRUGO,	\
  		show_temp_pwm_enable, store_temp_pwm_enable,		\
  		TEMP_PWM_ENABLE, index - 1),				\
  	SENSOR_ATTR_2(temp##index##_auto_channels_pwm, S_IWUSR | S_IRUGO, \
  		show_temp_pwm_enable, store_temp_pwm_enable,		\
  		TEMP_PWM_FAN_MAP, index - 1),				\
  	SENSOR_ATTR_2(thermal_cruise##index, S_IWUSR | S_IRUGO,		\
  		show_temp_pwm, store_temp_pwm, TEMP_PWM_TTTI, index - 1), \

  	SENSOR_ATTR_2(temp##index##_warn, S_IWUSR | S_IRUGO,		\

  		show_temp_pwm, store_temp_pwm, TEMP_PWM_CTFS, index - 1), \

  	SENSOR_ATTR_2(temp##index##_warn_hyst, S_IWUSR | S_IRUGO,	\

  		show_temp_pwm, store_temp_pwm, TEMP_PWM_HCT, index - 1), \
  	SENSOR_ATTR_2(temp##index##_operation_hyst, S_IWUSR | S_IRUGO,	\
  		show_temp_pwm, store_temp_pwm, TEMP_PWM_HOT, index - 1), \
  	SENSOR_ATTR_2(temp##index##_auto_point1_pwm, S_IRUGO | S_IWUSR, \
  		show_sf4_pwm, store_sf4_pwm, 0, index - 1),		\
  	SENSOR_ATTR_2(temp##index##_auto_point2_pwm, S_IRUGO | S_IWUSR, \
  		show_sf4_pwm, store_sf4_pwm, 1, index - 1),		\
  	SENSOR_ATTR_2(temp##index##_auto_point3_pwm, S_IRUGO | S_IWUSR, \
  		show_sf4_pwm, store_sf4_pwm, 2, index - 1),		\
  	SENSOR_ATTR_2(temp##index##_auto_point4_pwm, S_IRUGO | S_IWUSR, \
  		show_sf4_pwm, store_sf4_pwm, 3, index - 1),		\
  	SENSOR_ATTR_2(temp##index##_auto_point5_pwm, S_IRUGO | S_IWUSR, \
  		show_sf4_pwm, store_sf4_pwm, 4, index - 1),		\
  	SENSOR_ATTR_2(temp##index##_auto_point6_pwm, S_IRUGO | S_IWUSR, \
  		show_sf4_pwm, store_sf4_pwm, 5, index - 1),		\
  	SENSOR_ATTR_2(temp##index##_auto_point7_pwm, S_IRUGO | S_IWUSR, \
  		show_sf4_pwm, store_sf4_pwm, 6, index - 1),		\
  	SENSOR_ATTR_2(temp##index##_auto_point1_temp, S_IRUGO | S_IWUSR,\
  		show_sf4_temp, store_sf4_temp, 0, index - 1),		\
  	SENSOR_ATTR_2(temp##index##_auto_point2_temp, S_IRUGO | S_IWUSR,\
  		show_sf4_temp, store_sf4_temp, 1, index - 1),		\
  	SENSOR_ATTR_2(temp##index##_auto_point3_temp, S_IRUGO | S_IWUSR,\
  		show_sf4_temp, store_sf4_temp, 2, index - 1),		\
  	SENSOR_ATTR_2(temp##index##_auto_point4_temp, S_IRUGO | S_IWUSR,\
  		show_sf4_temp, store_sf4_temp, 3, index - 1),		\
  	SENSOR_ATTR_2(temp##index##_auto_point5_temp, S_IRUGO | S_IWUSR,\
  		show_sf4_temp, store_sf4_temp, 4, index - 1),		\
  	SENSOR_ATTR_2(temp##index##_auto_point6_temp, S_IRUGO | S_IWUSR,\
  		show_sf4_temp, store_sf4_temp, 5, index - 1),		\
  	SENSOR_ATTR_2(temp##index##_auto_point7_temp, S_IRUGO | S_IWUSR,\

  		show_sf4_temp, store_sf4_temp, 6, index - 1) }

  static struct sensor_device_attribute_2 w83795_in[][5] = {

  	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_IN(10),
  	SENSOR_ATTR_IN(11),
  	SENSOR_ATTR_IN(12),
  	SENSOR_ATTR_IN(13),
  	SENSOR_ATTR_IN(14),
  	SENSOR_ATTR_IN(15),
  	SENSOR_ATTR_IN(16),
  	SENSOR_ATTR_IN(17),
  	SENSOR_ATTR_IN(18),
  	SENSOR_ATTR_IN(19),
  	SENSOR_ATTR_IN(20),
  };

  static const struct sensor_device_attribute_2 w83795_fan[][4] = {

  	SENSOR_ATTR_FAN(1),
  	SENSOR_ATTR_FAN(2),
  	SENSOR_ATTR_FAN(3),
  	SENSOR_ATTR_FAN(4),
  	SENSOR_ATTR_FAN(5),
  	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),
  	SENSOR_ATTR_FAN(13),
  	SENSOR_ATTR_FAN(14),
  };

  static const struct sensor_device_attribute_2 w83795_temp[][28] = {

  	SENSOR_ATTR_TEMP(1),
  	SENSOR_ATTR_TEMP(2),
  	SENSOR_ATTR_TEMP(3),
  	SENSOR_ATTR_TEMP(4),
  	SENSOR_ATTR_TEMP(5),
  	SENSOR_ATTR_TEMP(6),
  };

  static const struct sensor_device_attribute_2 w83795_dts[][8] = {

  	SENSOR_ATTR_DTS(7),
  	SENSOR_ATTR_DTS(8),
  	SENSOR_ATTR_DTS(9),
  	SENSOR_ATTR_DTS(10),
  	SENSOR_ATTR_DTS(11),
  	SENSOR_ATTR_DTS(12),
  	SENSOR_ATTR_DTS(13),
  	SENSOR_ATTR_DTS(14),
  };

  static const struct sensor_device_attribute_2 w83795_pwm[][8] = {

  	SENSOR_ATTR_PWM(1),
  	SENSOR_ATTR_PWM(2),

  	SENSOR_ATTR_PWM(3),
  	SENSOR_ATTR_PWM(4),
  	SENSOR_ATTR_PWM(5),
  	SENSOR_ATTR_PWM(6),
  	SENSOR_ATTR_PWM(7),
  	SENSOR_ATTR_PWM(8),
  };

  static const struct sensor_device_attribute_2 w83795_tss[6] = {
  	SENSOR_ATTR_2(temp1_source_sel, S_IWUSR | S_IRUGO,
  		      show_temp_src, store_temp_src, NOT_USED, 0),
  	SENSOR_ATTR_2(temp2_source_sel, S_IWUSR | S_IRUGO,
  		      show_temp_src, store_temp_src, NOT_USED, 1),
  	SENSOR_ATTR_2(temp3_source_sel, S_IWUSR | S_IRUGO,
  		      show_temp_src, store_temp_src, NOT_USED, 2),
  	SENSOR_ATTR_2(temp4_source_sel, S_IWUSR | S_IRUGO,
  		      show_temp_src, store_temp_src, NOT_USED, 3),
  	SENSOR_ATTR_2(temp5_source_sel, S_IWUSR | S_IRUGO,
  		      show_temp_src, store_temp_src, NOT_USED, 4),
  	SENSOR_ATTR_2(temp6_source_sel, S_IWUSR | S_IRUGO,
  		      show_temp_src, store_temp_src, NOT_USED, 5),
  };

  static const 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, 46),

  #ifdef CONFIG_SENSORS_W83795_FANCTRL

  	SENSOR_ATTR_2(speed_cruise_tolerance, S_IWUSR | S_IRUGO, show_fanin,
  		store_fanin, FANIN_TOL, 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),

  #endif

  };

  static const struct sensor_device_attribute_2 sda_beep_files[] = {
  	SENSOR_ATTR_2(intrusion0_beep, S_IWUSR | S_IRUGO, show_alarm_beep,
  		      store_beep, BEEP_ENABLE, 46),
  	SENSOR_ATTR_2(beep_enable, S_IWUSR | S_IRUGO, show_alarm_beep,
  		      store_beep, BEEP_ENABLE, 47),
  };

  /*
   * Driver interface
   */
  
  static void w83795_init_client(struct i2c_client *client)
  {

  	struct w83795_data *data = i2c_get_clientdata(client);
  	static const u16 clkin[4] = {	/* in kHz */
  		14318, 24000, 33333, 48000
  	};

  	u8 config;

  	if (reset)
  		w83795_write(client, W83795_REG_CONFIG, 0x80);

  	/* Start monitoring if needed */
  	config = w83795_read(client, W83795_REG_CONFIG);
  	if (!(config & W83795_REG_CONFIG_START)) {
  		dev_info(&client->dev, "Enabling monitoring operations
  ");
  		w83795_write(client, W83795_REG_CONFIG,
  			     config | W83795_REG_CONFIG_START);
  	}

  
  	data->clkin = clkin[(config >> 3) & 0x3];
  	dev_dbg(&client->dev, "clkin = %u kHz
  ", data->clkin);

  }

  static int w83795_get_device_id(struct i2c_client *client)
  {
  	int device_id;
  
  	device_id = i2c_smbus_read_byte_data(client, W83795_REG_DEVICEID);
  
  	/* Special case for rev. A chips; can't be checked first because later
  	   revisions emulate this for compatibility */
  	if (device_id < 0 || (device_id & 0xf0) != 0x50) {
  		int alt_id;
  
  		alt_id = i2c_smbus_read_byte_data(client,
  						  W83795_REG_DEVICEID_A);
  		if (alt_id == 0x50)
  			device_id = alt_id;
  	}
  
  	return device_id;
  }

  /* Return 0 if detection is successful, -ENODEV otherwise */
  static int w83795_detect(struct i2c_client *client,
  			 struct i2c_board_info *info)
  {

  	int bank, vendor_id, device_id, expected, i2c_addr, config;

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

  	const char *chip_name;

  
  	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
  		return -ENODEV;
  	bank = i2c_smbus_read_byte_data(client, W83795_REG_BANKSEL);

  	if (bank < 0 || (bank & 0x7c)) {
  		dev_dbg(&adapter->dev,
  			"w83795: Detection failed at addr 0x%02hx, check %s
  ",
  			address, "bank");
  		return -ENODEV;
  	}

  	/* Check Nuvoton vendor ID */

  	vendor_id = i2c_smbus_read_byte_data(client, W83795_REG_VENDORID);
  	expected = bank & 0x80 ? 0x5c : 0xa3;
  	if (vendor_id != expected) {
  		dev_dbg(&adapter->dev,
  			"w83795: Detection failed at addr 0x%02hx, check %s
  ",
  			address, "vendor id");

  		return -ENODEV;
  	}

  	/* Check device ID */
  	device_id = w83795_get_device_id(client) |
  		    (i2c_smbus_read_byte_data(client, W83795_REG_CHIPID) << 8);
  	if ((device_id >> 4) != 0x795) {
  		dev_dbg(&adapter->dev,
  			"w83795: Detection failed at addr 0x%02hx, check %s
  ",
  			address, "device id
  ");

  		return -ENODEV;
  	}

  	/* If Nuvoton chip, address of chip and W83795_REG_I2C_ADDR
  	   should match */
  	if ((bank & 0x07) == 0) {
  		i2c_addr = i2c_smbus_read_byte_data(client,
  						    W83795_REG_I2C_ADDR);
  		if ((i2c_addr & 0x7f) != address) {
  			dev_dbg(&adapter->dev,
  				"w83795: Detection failed at addr 0x%02hx, "
  				"check %s
  ", address, "i2c addr");
  			return -ENODEV;
  		}

  	}

  	/* Check 795 chip type: 795G or 795ADG
  	   Usually we don't write to chips during detection, but here we don't
  	   quite have the choice; hopefully it's OK, we are about to return
  	   success anyway */
  	if ((bank & 0x07) != 0)
  		i2c_smbus_write_byte_data(client, W83795_REG_BANKSEL,
  					  bank & ~0x07);

  	config = i2c_smbus_read_byte_data(client, W83795_REG_CONFIG);
  	if (config & W83795_REG_CONFIG_CONFIG48)

  		chip_name = "w83795adg";

  	else

  		chip_name = "w83795g";

  	strlcpy(info->type, chip_name, I2C_NAME_SIZE);

  	dev_info(&adapter->dev, "Found %s rev. %c at 0x%02hx
  ", chip_name,
  		 'A' + (device_id & 0xf), address);

  
  	return 0;
  }

  static int w83795_handle_files(struct device *dev, int (*fn)(struct device *,
  			       const struct device_attribute *))

  {
  	struct w83795_data *data = dev_get_drvdata(dev);

  	int err, i, j;

  
  	for (i = 0; i < ARRAY_SIZE(w83795_in); i++) {

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

  			continue;

  		for (j = 0; j < ARRAY_SIZE(w83795_in[0]); j++) {

  			if (j == 4 && !data->enable_beep)
  				continue;

  			err = fn(dev, &w83795_in[i][j].dev_attr);
  			if (err)
  				return err;
  		}

  	}
  
  	for (i = 0; i < ARRAY_SIZE(w83795_fan); i++) {

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

  			continue;

  		for (j = 0; j < ARRAY_SIZE(w83795_fan[0]); j++) {

  			if (j == 3 && !data->enable_beep)
  				continue;

  			err = fn(dev, &w83795_fan[i][j].dev_attr);
  			if (err)
  				return err;
  		}

  	}

  	for (i = 0; i < ARRAY_SIZE(w83795_tss); i++) {
  		j = w83795_tss_useful(data, i);
  		if (!j)
  			continue;
  		err = fn(dev, &w83795_tss[i].dev_attr);
  		if (err)
  			return err;
  	}

  	for (i = 0; i < ARRAY_SIZE(sda_single_files); i++) {

  		err = fn(dev, &sda_single_files[i].dev_attr);

  		if (err)
  			return err;
  	}

  	if (data->enable_beep) {
  		for (i = 0; i < ARRAY_SIZE(sda_beep_files); i++) {
  			err = fn(dev, &sda_beep_files[i].dev_attr);
  			if (err)
  				return err;
  		}
  	}

  #ifdef CONFIG_SENSORS_W83795_FANCTRL

  	for (i = 0; i < data->has_pwm; i++) {
  		for (j = 0; j < ARRAY_SIZE(w83795_pwm[0]); j++) {
  			err = fn(dev, &w83795_pwm[i][j].dev_attr);

  			if (err)
  				return err;
  		}
  	}

  #endif

  
  	for (i = 0; i < ARRAY_SIZE(w83795_temp); i++) {

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

  			continue;

  #ifdef CONFIG_SENSORS_W83795_FANCTRL

  		for (j = 0; j < ARRAY_SIZE(w83795_temp[0]); j++) {

  #else
  		for (j = 0; j < 8; j++) {
  #endif

  			if (j == 7 && !data->enable_beep)
  				continue;

  			err = fn(dev, &w83795_temp[i][j].dev_attr);
  			if (err)
  				return err;
  		}

  	}

  	if (data->enable_dts) {

  		for (i = 0; i < ARRAY_SIZE(w83795_dts); i++) {

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

  				continue;

  			for (j = 0; j < ARRAY_SIZE(w83795_dts[0]); j++) {

  				if (j == 7 && !data->enable_beep)
  					continue;

  				err = fn(dev, &w83795_dts[i][j].dev_attr);
  				if (err)
  					return err;
  			}

  		}
  	}

  	return 0;
  }

  /* We need a wrapper that fits in w83795_handle_files */
  static int device_remove_file_wrapper(struct device *dev,
  				      const struct device_attribute *attr)

  {

  	device_remove_file(dev, attr);
  	return 0;

  }

  static void w83795_check_dynamic_in_limits(struct i2c_client *client)
  {
  	struct w83795_data *data = i2c_get_clientdata(client);
  	u8 vid_ctl;
  	int i, err_max, err_min;
  
  	vid_ctl = w83795_read(client, W83795_REG_VID_CTRL);
  
  	/* Return immediately if VRM isn't configured */
  	if ((vid_ctl & 0x07) == 0x00 || (vid_ctl & 0x07) == 0x07)
  		return;
  
  	data->has_dyn_in = (vid_ctl >> 3) & 0x07;
  	for (i = 0; i < 2; i++) {
  		if (!(data->has_dyn_in & (1 << i)))
  			continue;
  
  		/* Voltage limits in dynamic mode, switch to read-only */
  		err_max = sysfs_chmod_file(&client->dev.kobj,
  					   &w83795_in[i][2].dev_attr.attr,
  					   S_IRUGO);
  		err_min = sysfs_chmod_file(&client->dev.kobj,
  					   &w83795_in[i][3].dev_attr.attr,
  					   S_IRUGO);
  		if (err_max || err_min)
  			dev_warn(&client->dev, "Failed to set in%d limits "
  				 "read-only (%d, %d)
  ", i, err_max, err_min);
  		else
  			dev_info(&client->dev, "in%d limits set dynamically "
  				 "from VID
  ", i);
  	}
  }

  /* Check pins that can be used for either temperature or voltage monitoring */
  static void w83795_apply_temp_config(struct w83795_data *data, u8 config,
  				     int temp_chan, int in_chan)
  {
  	/* config is a 2-bit value */
  	switch (config) {
  	case 0x2: /* Voltage monitoring */
  		data->has_in |= 1 << in_chan;
  		break;
  	case 0x1: /* Thermal diode */
  		if (temp_chan >= 4)
  			break;
  		data->temp_mode |= 1 << temp_chan;
  		/* fall through */
  	case 0x3: /* Thermistor */
  		data->has_temp |= 1 << temp_chan;
  		break;
  	}
  }

  static int w83795_probe(struct i2c_client *client,
  			const struct i2c_device_id *id)
  {
  	int i;
  	u8 tmp;
  	struct device *dev = &client->dev;
  	struct w83795_data *data;

  	int err;

  
  	data = kzalloc(sizeof(struct w83795_data), GFP_KERNEL);
  	if (!data) {
  		err = -ENOMEM;
  		goto exit;
  	}
  
  	i2c_set_clientdata(client, data);

  	data->chip_type = id->driver_data;

  	data->bank = i2c_smbus_read_byte_data(client, W83795_REG_BANKSEL);
  	mutex_init(&data->update_lock);
  
  	/* Initialize the chip */
  	w83795_init_client(client);

  	/* Check which voltages and fans are present */
  	data->has_in = w83795_read(client, W83795_REG_VOLT_CTRL1)
  		     | (w83795_read(client, W83795_REG_VOLT_CTRL2) << 8);
  	data->has_fan = w83795_read(client, W83795_REG_FANIN_CTRL1)
  		      | (w83795_read(client, W83795_REG_FANIN_CTRL2) << 8);

  	/* Check which analog temperatures and extra voltages are present */

  	tmp = w83795_read(client, W83795_REG_TEMP_CTRL1);
  	if (tmp & 0x20)
  		data->enable_dts = 1;

  	w83795_apply_temp_config(data, (tmp >> 2) & 0x3, 5, 16);
  	w83795_apply_temp_config(data, tmp & 0x3, 4, 15);

  	tmp = w83795_read(client, W83795_REG_TEMP_CTRL2);

  	w83795_apply_temp_config(data, tmp >> 6, 3, 20);
  	w83795_apply_temp_config(data, (tmp >> 4) & 0x3, 2, 19);
  	w83795_apply_temp_config(data, (tmp >> 2) & 0x3, 1, 18);
  	w83795_apply_temp_config(data, tmp & 0x3, 0, 17);

  
  	/* Check DTS enable status */

  	if (data->enable_dts) {

  		if (1 & w83795_read(client, W83795_REG_DTSC))
  			data->enable_dts |= 2;
  		data->has_dts = w83795_read(client, W83795_REG_DTSE);
  	}

  	/* Report PECI Tbase values */
  	if (data->enable_dts == 1) {
  		for (i = 0; i < 8; i++) {
  			if (!(data->has_dts & (1 << i)))
  				continue;
  			tmp = w83795_read(client, W83795_REG_PECI_TBASE(i));
  			dev_info(&client->dev,
  				 "PECI agent %d Tbase temperature: %u
  ",
  				 i + 1, (unsigned int)tmp & 0x7f);
  		}
  	}

  	data->has_gain = w83795_read(client, W83795_REG_VMIGB_CTRL) & 0x0f;

  
  	/* pwm and smart fan */
  	if (data->chip_type == w83795g)
  		data->has_pwm = 8;
  	else
  		data->has_pwm = 2;

  	/* Check if BEEP pin is available */
  	if (data->chip_type == w83795g) {
  		/* The W83795G has a dedicated BEEP pin */
  		data->enable_beep = 1;
  	} else {
  		/* The W83795ADG has a shared pin for OVT# and BEEP, so you
  		 * can't have both */
  		tmp = w83795_read(client, W83795_REG_OVT_CFG);
  		if ((tmp & OVT_CFG_SEL) == 0)
  			data->enable_beep = 1;
  	}

  	err = w83795_handle_files(dev, device_create_file);

  	if (err)
  		goto exit_remove;

  	if (data->chip_type == w83795g)
  		w83795_check_dynamic_in_limits(client);

  	data->hwmon_dev = hwmon_device_register(dev);
  	if (IS_ERR(data->hwmon_dev)) {
  		err = PTR_ERR(data->hwmon_dev);
  		goto exit_remove;
  	}
  
  	return 0;

  exit_remove:

  	w83795_handle_files(dev, device_remove_file_wrapper);

  	kfree(data);
  exit:
  	return err;
  }
  
  static int w83795_remove(struct i2c_client *client)
  {
  	struct w83795_data *data = i2c_get_clientdata(client);

  
  	hwmon_device_unregister(data->hwmon_dev);

  	w83795_handle_files(&client->dev, device_remove_file_wrapper);

  	kfree(data);
  
  	return 0;
  }
  
  
  static const struct i2c_device_id w83795_id[] = {

  	{ "w83795g", w83795g },
  	{ "w83795adg", w83795adg },

  	{ }
  };
  MODULE_DEVICE_TABLE(i2c, w83795_id);
  
  static struct i2c_driver w83795_driver = {
  	.driver = {
  		   .name = "w83795",
  	},
  	.probe		= w83795_probe,
  	.remove		= w83795_remove,
  	.id_table	= w83795_id,
  
  	.class		= I2C_CLASS_HWMON,
  	.detect		= w83795_detect,
  	.address_list	= normal_i2c,
  };
  
  static int __init sensors_w83795_init(void)
  {
  	return i2c_add_driver(&w83795_driver);
  }
  
  static void __exit sensors_w83795_exit(void)
  {
  	i2c_del_driver(&w83795_driver);
  }

  MODULE_AUTHOR("Wei Song, Jean Delvare <khali@linux-fr.org>");

  MODULE_DESCRIPTION("W83795G/ADG hardware monitoring driver");

  MODULE_LICENSE("GPL");
  
  module_init(sensors_w83795_init);
  module_exit(sensors_w83795_exit);