/*
 *  w83795.c - Linux kernel driver for hardware monitoring
 *  Copyright (C) 2008 Nuvoton Technology Corp.
 *                Wei Song
 *  Copyright (C) 2010 Jean Delvare <jdelvare@suse.de>
 *
 *  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/jiffies.h>
#include <linux/util_macros.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 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 / 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 */
        reg0 = find_closest_descending(val, pwm_freq_cksel0,
                                       ARRAY_SIZE(pwm_freq_cksel0));
        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 = clamp_val(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\n",
                        (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\n",
                        (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\n",
                        (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\n", 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\n", 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\n", 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 = clamp_val(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\n", 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;

#ifndef CONFIG_SENSORS_W83795_FANCTRL
        if (val > 1) {
                dev_warn(dev, "Automatic fan speed control support disabled\n");
                dev_warn(dev, "Build with CONFIG_SENSORS_W83795_FANCTRL=y if you want it\n");
                return -EOPNOTSUPP;
        }
#endif

        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\n", 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\n", (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\n", 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 = clamp_val(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\n", 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(clamp_val(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 = clamp_val(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\n", 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 = clamp_val(val, 0, 0x7f);
                w83795_write(client, W83795_REG_TTTI(index), val);
                break;
        case TEMP_PWM_CTFS:
                val = clamp_val(val, 0, 0x7f);
                w83795_write(client, W83795_REG_CTFS(index), val);
                break;
        case TEMP_PWM_HCT:
                val = clamp_val(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 = clamp_val(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\n", 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\n",
                (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\n", 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\n", 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\n", 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\n", 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\n", 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\n", 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 = clamp_val(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\n", 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 = clamp_val(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##_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(pwm##index##_freq, S_IWUSR | S_IRUGO,             \
                show_pwm, store_pwm, PWM_FREQ, 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(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\n");
                w83795_write(client, W83795_REG_CONFIG,
                             config | W83795_REG_CONFIG_START);
        }

        data->clkin = clkin[(config >> 3) & 0x3];
        dev_dbg(&client->dev, "clkin = %u kHz\n", 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\n",
                        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\n",
                        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\n",
                        address, "device id\n");
                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\n", 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\n", chip_name,
                 'A' + (device_id & 0xf), address);

        return 0;
}

#ifdef CONFIG_SENSORS_W83795_FANCTRL
#define NUM_PWM_ATTRIBUTES      ARRAY_SIZE(w83795_pwm[0])
#define NUM_TEMP_ATTRIBUTES     ARRAY_SIZE(w83795_temp[0])
#else
#define NUM_PWM_ATTRIBUTES      4
#define NUM_TEMP_ATTRIBUTES     8
#endif

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;
                }
        }

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

        for (i = 0; i < ARRAY_SIZE(w83795_temp); i++) {
                if (!(data->has_temp & (1 << i)))
                        continue;
                for (j = 0; j < NUM_TEMP_ATTRIBUTES; j++) {
                        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)\n",
                                 i, err_max, err_min);
                else
                        dev_info(&client->dev,
                                 "in%d limits set dynamically from VID\n", 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 = devm_kzalloc(dev, sizeof(struct w83795_data), GFP_KERNEL);
        if (!data)
                return -ENOMEM;

        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\n",
                                 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);
        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);

        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,
};

module_i2c_driver(w83795_driver);

MODULE_AUTHOR("Wei Song, Jean Delvare <jdelvare@suse.de>");
MODULE_DESCRIPTION("W83795G/ADG hardware monitoring driver");
MODULE_LICENSE("GPL");