// SPDX-License-Identifier: GPL-2.0-only
/*
 * w83793.c - Linux kernel driver for hardware monitoring
 * Copyright (C) 2006 Winbond Electronics Corp.
 *            Yuan Mu
 *            Rudolf Marek <r.marek@assembler.cz>
 * Copyright (C) 2009-2010 Sven Anders <anders@anduras.de>, ANDURAS AG.
 *              Watchdog driver part
 *              (Based partially on fschmd driver,
 *               Copyright 2007-2008 by Hans de Goede)
 */

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

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-vid.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/fs.h>
#include <linux/watchdog.h>
#include <linux/miscdevice.h>
#include <linux/uaccess.h>
#include <linux/kref.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/jiffies.h>

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

/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
                                                I2C_CLIENT_END };

/* Insmod parameters */

static unsigned short force_subclients[4];
module_param_array(force_subclients, short, NULL, 0);
MODULE_PARM_DESC(force_subclients,
                 "List of subclient addresses: {bus, clientaddr, subclientaddr1, subclientaddr2}");

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

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

static bool nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout,
        "Watchdog cannot be stopped once started (default="
                                __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");

/*
 * Address 0x00, 0x0d, 0x0e, 0x0f in all three banks are reserved
 * as ID, Bank Select registers
 */
#define W83793_REG_BANKSEL              0x00
#define W83793_REG_VENDORID             0x0d
#define W83793_REG_CHIPID               0x0e
#define W83793_REG_DEVICEID             0x0f

#define W83793_REG_CONFIG               0x40
#define W83793_REG_MFC                  0x58
#define W83793_REG_FANIN_CTRL           0x5c
#define W83793_REG_FANIN_SEL            0x5d
#define W83793_REG_I2C_ADDR             0x0b
#define W83793_REG_I2C_SUBADDR          0x0c
#define W83793_REG_VID_INA              0x05
#define W83793_REG_VID_INB              0x06
#define W83793_REG_VID_LATCHA           0x07
#define W83793_REG_VID_LATCHB           0x08
#define W83793_REG_VID_CTRL             0x59

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

static u16 W83793_REG_TEMP_MODE[2] = { 0x5e, 0x5f };

#define TEMP_READ       0
#define TEMP_CRIT       1
#define TEMP_CRIT_HYST  2
#define TEMP_WARN       3
#define TEMP_WARN_HYST  4
/*
 * only crit and crit_hyst affect real-time alarm status
 * current crit crit_hyst warn warn_hyst
 */
static u16 W83793_REG_TEMP[][5] = {
        {0x1c, 0x78, 0x79, 0x7a, 0x7b},
        {0x1d, 0x7c, 0x7d, 0x7e, 0x7f},
        {0x1e, 0x80, 0x81, 0x82, 0x83},
        {0x1f, 0x84, 0x85, 0x86, 0x87},
        {0x20, 0x88, 0x89, 0x8a, 0x8b},
        {0x21, 0x8c, 0x8d, 0x8e, 0x8f},
};

#define W83793_REG_TEMP_LOW_BITS        0x22

#define W83793_REG_BEEP(index)          (0x53 + (index))
#define W83793_REG_ALARM(index)         (0x4b + (index))

#define W83793_REG_CLR_CHASSIS          0x4a    /* SMI MASK4 */
#define W83793_REG_IRQ_CTRL             0x50
#define W83793_REG_OVT_CTRL             0x51
#define W83793_REG_OVT_BEEP             0x52

#define IN_READ                         0
#define IN_MAX                          1
#define IN_LOW                          2
static const u16 W83793_REG_IN[][3] = {
        /* Current, High, Low */
        {0x10, 0x60, 0x61},     /* Vcore A      */
        {0x11, 0x62, 0x63},     /* Vcore B      */
        {0x12, 0x64, 0x65},     /* Vtt          */
        {0x14, 0x6a, 0x6b},     /* VSEN1        */
        {0x15, 0x6c, 0x6d},     /* VSEN2        */
        {0x16, 0x6e, 0x6f},     /* +3VSEN       */
        {0x17, 0x70, 0x71},     /* +12VSEN      */
        {0x18, 0x72, 0x73},     /* 5VDD         */
        {0x19, 0x74, 0x75},     /* 5VSB         */
        {0x1a, 0x76, 0x77},     /* VBAT         */
};

/* Low Bits of Vcore A/B Vtt Read/High/Low */
static const u16 W83793_REG_IN_LOW_BITS[] = { 0x1b, 0x68, 0x69 };
static u8 scale_in[] = { 2, 2, 2, 16, 16, 16, 8, 24, 24, 16 };
static u8 scale_in_add[] = { 0, 0, 0, 0, 0, 0, 0, 150, 150, 0 };

#define W83793_REG_FAN(index)           (0x23 + 2 * (index))    /* High byte */
#define W83793_REG_FAN_MIN(index)       (0x90 + 2 * (index))    /* High byte */

#define W83793_REG_PWM_DEFAULT          0xb2
#define W83793_REG_PWM_ENABLE           0x207
#define W83793_REG_PWM_UPTIME           0xc3    /* Unit in 0.1 second */
#define W83793_REG_PWM_DOWNTIME         0xc4    /* Unit in 0.1 second */
#define W83793_REG_TEMP_CRITICAL        0xc5

#define PWM_DUTY                        0
#define PWM_START                       1
#define PWM_NONSTOP                     2
#define PWM_STOP_TIME                   3
#define W83793_REG_PWM(index, nr)       (((nr) == 0 ? 0xb3 : \
                                         (nr) == 1 ? 0x220 : 0x218) + (index))

/* bit field, fan1 is bit0, fan2 is bit1 ... */
#define W83793_REG_TEMP_FAN_MAP(index)  (0x201 + (index))
#define W83793_REG_TEMP_TOL(index)      (0x208 + (index))
#define W83793_REG_TEMP_CRUISE(index)   (0x210 + (index))
#define W83793_REG_PWM_STOP_TIME(index) (0x228 + (index))
#define W83793_REG_SF2_TEMP(index, nr)  (0x230 + ((index) << 4) + (nr))
#define W83793_REG_SF2_PWM(index, nr)   (0x238 + ((index) << 4) + (nr))

static inline unsigned long FAN_FROM_REG(u16 val)
{
        if ((val >= 0xfff) || (val == 0))
                return  0;
        return 1350000UL / val;
}

static inline u16 FAN_TO_REG(long rpm)
{
        if (rpm <= 0)
                return 0x0fff;
        return clamp_val((1350000 + (rpm >> 1)) / rpm, 1, 0xffe);
}

static inline unsigned long TIME_FROM_REG(u8 reg)
{
        return reg * 100;
}

static inline u8 TIME_TO_REG(unsigned long val)
{
        return clamp_val((val + 50) / 100, 0, 0xff);
}

static inline long TEMP_FROM_REG(s8 reg)
{
        return reg * 1000;
}

static inline s8 TEMP_TO_REG(long val, s8 min, s8 max)
{
        return clamp_val((val + (val < 0 ? -500 : 500)) / 1000, min, max);
}

struct w83793_data {
        struct i2c_client *lm75[2];
        struct device *hwmon_dev;
        struct mutex update_lock;
        char valid;                     /* !=0 if following fields are valid */
        unsigned long last_updated;     /* In jiffies */
        unsigned long last_nonvolatile; /* In jiffies, last time we update the
                                         * nonvolatile registers
                                         */

        u8 bank;
        u8 vrm;
        u8 vid[2];
        u8 in[10][3];           /* Register value, read/high/low */
        u8 in_low_bits[3];      /* Additional resolution for VCore A/B Vtt */

        u16 has_fan;            /* Only fan1- fan5 has own pins */
        u16 fan[12];            /* Register value combine */
        u16 fan_min[12];        /* Register value combine */

        s8 temp[6][5];          /* current, crit, crit_hyst,warn, warn_hyst */
        u8 temp_low_bits;       /* Additional resolution TD1-TD4 */
        u8 temp_mode[2];        /* byte 0: Temp D1-D4 mode each has 2 bits
                                 * byte 1: Temp R1,R2 mode, each has 1 bit
                                 */
        u8 temp_critical;       /* If reached all fan will be at full speed */
        u8 temp_fan_map[6];     /* Temp controls which pwm fan, bit field */

        u8 has_pwm;
        u8 has_temp;
        u8 has_vid;
        u8 pwm_enable;          /* Register value, each Temp has 1 bit */
        u8 pwm_uptime;          /* Register value */
        u8 pwm_downtime;        /* Register value */
        u8 pwm_default;         /* All fan default pwm, next poweron valid */
        u8 pwm[8][3];           /* Register value */
        u8 pwm_stop_time[8];
        u8 temp_cruise[6];

        u8 alarms[5];           /* realtime status registers */
        u8 beeps[5];
        u8 beep_enable;
        u8 tolerance[3];        /* Temp tolerance(Smart Fan I/II) */
        u8 sf2_pwm[6][7];       /* Smart FanII: Fan duty cycle */
        u8 sf2_temp[6][7];      /* Smart FanII: Temp level point */

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

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

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

/*
 * Release our data struct when we're detached from the i2c client *and* all
 * references to our watchdog device are released
 */
static void w83793_release_resources(struct kref *ref)
{
        struct w83793_data *data = container_of(ref, struct w83793_data, kref);
        kfree(data);
}

static u8 w83793_read_value(struct i2c_client *client, u16 reg);
static int w83793_write_value(struct i2c_client *client, u16 reg, u8 value);
static int w83793_probe(struct i2c_client *client,
                        const struct i2c_device_id *id);
static int w83793_detect(struct i2c_client *client,
                         struct i2c_board_info *info);
static int w83793_remove(struct i2c_client *client);
static void w83793_init_client(struct i2c_client *client);
static void w83793_update_nonvolatile(struct device *dev);
static struct w83793_data *w83793_update_device(struct device *dev);

static const struct i2c_device_id w83793_id[] = {
        { "w83793", 0 },
        { }
};
MODULE_DEVICE_TABLE(i2c, w83793_id);

static struct i2c_driver w83793_driver = {
        .class          = I2C_CLASS_HWMON,
        .driver = {
                   .name = "w83793",
        },
        .probe          = w83793_probe,
        .remove         = w83793_remove,
        .id_table       = w83793_id,
        .detect         = w83793_detect,
        .address_list   = normal_i2c,
};

static ssize_t
vrm_show(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct w83793_data *data = dev_get_drvdata(dev);
        return sprintf(buf, "%d\n", data->vrm);
}

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

        return sprintf(buf, "%d\n", vid_from_reg(data->vid[index], data->vrm));
}

static ssize_t
vrm_store(struct device *dev, struct device_attribute *attr,
          const char *buf, size_t count)
{
        struct w83793_data *data = dev_get_drvdata(dev);
        unsigned long val;
        int err;

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

        if (val > 255)
                return -EINVAL;

        data->vrm = val;
        return count;
}

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

        if (nr == ALARM_STATUS) {
                val = (data->alarms[index] >> (bit)) & 1;
        } else {                /* BEEP_ENABLE */
                val = (data->beeps[index] >> (bit)) & 1;
        }

        return sprintf(buf, "%u\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 w83793_data *data = i2c_get_clientdata(client);
        struct sensor_device_attribute_2 *sensor_attr =
            to_sensor_dev_attr_2(attr);
        int index = sensor_attr->index >> 3;
        int shift = sensor_attr->index & 0x07;
        u8 beep_bit = 1 << shift;
        unsigned long val;
        int err;

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

        if (val > 1)
                return -EINVAL;

        mutex_lock(&data->update_lock);
        data->beeps[index] = w83793_read_value(client, W83793_REG_BEEP(index));
        data->beeps[index] &= ~beep_bit;
        data->beeps[index] |= val << shift;
        w83793_write_value(client, W83793_REG_BEEP(index), data->beeps[index]);
        mutex_unlock(&data->update_lock);

        return count;
}

static ssize_t
show_beep_enable(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct w83793_data *data = w83793_update_device(dev);
        return sprintf(buf, "%u\n", (data->beep_enable >> 1) & 0x01);
}

static ssize_t
store_beep_enable(struct device *dev, struct device_attribute *attr,
                  const char *buf, size_t count)
{
        struct i2c_client *client = to_i2c_client(dev);
        struct w83793_data *data = i2c_get_clientdata(client);
        unsigned long val;
        int err;

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

        if (val > 1)
                return -EINVAL;

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

        return count;
}

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

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

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

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

        if (nr == FAN_INPUT)
                val = data->fan[index] & 0x0fff;
        else
                val = data->fan_min[index] & 0x0fff;

        return sprintf(buf, "%lu\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 w83793_data *data = i2c_get_clientdata(client);
        unsigned long val;
        int err;

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

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

        return count;
}

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

        if (nr == PWM_STOP_TIME)
                val = TIME_FROM_REG(data->pwm_stop_time[index]);
        else
                val = (data->pwm[index][nr] & 0x3f) << 2;

        return sprintf(buf, "%d\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 w83793_data *data = i2c_get_clientdata(client);
        struct sensor_device_attribute_2 *sensor_attr =
            to_sensor_dev_attr_2(attr);
        int nr = sensor_attr->nr;
        int index = sensor_attr->index;
        unsigned long val;
        int err;

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

        mutex_lock(&data->update_lock);
        if (nr == PWM_STOP_TIME) {
                val = TIME_TO_REG(val);
                data->pwm_stop_time[index] = val;
                w83793_write_value(client, W83793_REG_PWM_STOP_TIME(index),
                                   val);
        } else {
                val = clamp_val(val, 0, 0xff) >> 2;
                data->pwm[index][nr] =
                    w83793_read_value(client, W83793_REG_PWM(index, nr)) & 0xc0;
                data->pwm[index][nr] |= val;
                w83793_write_value(client, W83793_REG_PWM(index, nr),
                                                        data->pwm[index][nr]);
        }

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

static ssize_t
show_temp(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct sensor_device_attribute_2 *sensor_attr =
            to_sensor_dev_attr_2(attr);
        int nr = sensor_attr->nr;
        int index = sensor_attr->index;
        struct w83793_data *data = w83793_update_device(dev);
        long temp = TEMP_FROM_REG(data->temp[index][nr]);

        if (nr == TEMP_READ && index < 4) {     /* Only TD1-TD4 have low bits */
                int low = ((data->temp_low_bits >> (index * 2)) & 0x03) * 250;
                temp += temp > 0 ? low : -low;
        }
        return sprintf(buf, "%ld\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 w83793_data *data = i2c_get_clientdata(client);
        long tmp;
        int err;

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

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

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

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

static ssize_t
show_temp_mode(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct w83793_data *data = w83793_update_device(dev);
        struct sensor_device_attribute_2 *sensor_attr =
            to_sensor_dev_attr_2(attr);
        int index = sensor_attr->index;
        u8 mask = (index < 4) ? 0x03 : 0x01;
        u8 shift = (index < 4) ? (2 * index) : (index - 4);
        u8 tmp;
        index = (index < 4) ? 0 : 1;

        tmp = (data->temp_mode[index] >> shift) & mask;

        /* for the internal sensor, found out if diode or thermistor */
        if (tmp == 1)
                tmp = index == 0 ? 3 : 4;
        else
                tmp = TO_TEMP_MODE[tmp];

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

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

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

        /* transform the sysfs interface values into table above */
        if ((val == 6) && (index < 4)) {
                val -= 3;
        } else if ((val == 3 && index < 4)
                || (val == 4 && index >= 4)) {
                /* transform diode or thermistor into internal enable */
                val = !!val;
        } else {
                return -EINVAL;
        }

        index = (index < 4) ? 0 : 1;
        mutex_lock(&data->update_lock);
        data->temp_mode[index] =
            w83793_read_value(client, W83793_REG_TEMP_MODE[index]);
        data->temp_mode[index] &= ~(mask << shift);
        data->temp_mode[index] |= val << shift;
        w83793_write_value(client, W83793_REG_TEMP_MODE[index],
                                                        data->temp_mode[index]);
        mutex_unlock(&data->update_lock);

        return count;
}

#define SETUP_PWM_DEFAULT               0
#define SETUP_PWM_UPTIME                1       /* Unit in 0.1s */
#define SETUP_PWM_DOWNTIME              2       /* Unit in 0.1s */
#define SETUP_TEMP_CRITICAL             3
static ssize_t
show_sf_setup(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct sensor_device_attribute_2 *sensor_attr =
            to_sensor_dev_attr_2(attr);
        int nr = sensor_attr->nr;
        struct w83793_data *data = w83793_update_device(dev);
        u32 val = 0;

        if (nr == SETUP_PWM_DEFAULT)
                val = (data->pwm_default & 0x3f) << 2;
        else if (nr == SETUP_PWM_UPTIME)
                val = TIME_FROM_REG(data->pwm_uptime);
        else if (nr == SETUP_PWM_DOWNTIME)
                val = TIME_FROM_REG(data->pwm_downtime);
        else if (nr == SETUP_TEMP_CRITICAL)
                val = TEMP_FROM_REG(data->temp_critical & 0x7f);

        return sprintf(buf, "%d\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 w83793_data *data = i2c_get_clientdata(client);
        long val;
        int err;

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

        mutex_lock(&data->update_lock);
        if (nr == SETUP_PWM_DEFAULT) {
                data->pwm_default =
                    w83793_read_value(client, W83793_REG_PWM_DEFAULT) & 0xc0;
                data->pwm_default |= clamp_val(val, 0, 0xff) >> 2;
                w83793_write_value(client, W83793_REG_PWM_DEFAULT,
                                                        data->pwm_default);
        } else if (nr == SETUP_PWM_UPTIME) {
                data->pwm_uptime = TIME_TO_REG(val);
                data->pwm_uptime += data->pwm_uptime == 0 ? 1 : 0;
                w83793_write_value(client, W83793_REG_PWM_UPTIME,
                                                        data->pwm_uptime);
        } else if (nr == SETUP_PWM_DOWNTIME) {
                data->pwm_downtime = TIME_TO_REG(val);
                data->pwm_downtime += data->pwm_downtime == 0 ? 1 : 0;
                w83793_write_value(client, W83793_REG_PWM_DOWNTIME,
                                                        data->pwm_downtime);
        } else {                /* SETUP_TEMP_CRITICAL */
                data->temp_critical =
                    w83793_read_value(client, W83793_REG_TEMP_CRITICAL) & 0x80;
                data->temp_critical |= TEMP_TO_REG(val, 0, 0x7f);
                w83793_write_value(client, W83793_REG_TEMP_CRITICAL,
                                                        data->temp_critical);
        }

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

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

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

        if (nr == TEMP_FAN_MAP) {
                val = data->temp_fan_map[index];
        } else if (nr == TEMP_PWM_ENABLE) {
                /* +2 to transform into 2 and 3 to conform with sysfs intf */
                val = ((data->pwm_enable >> index) & 0x01) + 2;
        } else if (nr == TEMP_CRUISE) {
                val = TEMP_FROM_REG(data->temp_cruise[index] & 0x7f);
        } else {                /* TEMP_TOLERANCE */
                val = data->tolerance[index >> 1] >> ((index & 0x01) ? 4 : 0);
                val = TEMP_FROM_REG(val & 0x0f);
        }
        return sprintf(buf, "%d\n", val);
}

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

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

        mutex_lock(&data->update_lock);
        if (nr == TEMP_FAN_MAP) {
                val = clamp_val(val, 0, 255);
                w83793_write_value(client, W83793_REG_TEMP_FAN_MAP(index), val);
                data->temp_fan_map[index] = val;
        } else if (nr == TEMP_PWM_ENABLE) {
                if (val == 2 || val == 3) {
                        data->pwm_enable =
                            w83793_read_value(client, W83793_REG_PWM_ENABLE);
                        if (val - 2)
                                data->pwm_enable |= 1 << index;
                        else
                                data->pwm_enable &= ~(1 << index);
                        w83793_write_value(client, W83793_REG_PWM_ENABLE,
                                                        data->pwm_enable);
                } else {
                        mutex_unlock(&data->update_lock);
                        return -EINVAL;
                }
        } else if (nr == TEMP_CRUISE) {
                data->temp_cruise[index] =
                    w83793_read_value(client, W83793_REG_TEMP_CRUISE(index));
                data->temp_cruise[index] &= 0x80;
                data->temp_cruise[index] |= TEMP_TO_REG(val, 0, 0x7f);

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

                data->tolerance[i] &= ~(0x0f << shift);
                data->tolerance[i] |= TEMP_TO_REG(val, 0, 0x0f) << shift;
                w83793_write_value(client, W83793_REG_TEMP_TOL(i),
                                                        data->tolerance[i]);
        }

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

static ssize_t
show_sf2_pwm(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct sensor_device_attribute_2 *sensor_attr =
            to_sensor_dev_attr_2(attr);
        int nr = sensor_attr->nr;
        int index = sensor_attr->index;
        struct w83793_data *data = w83793_update_device(dev);

        return sprintf(buf, "%d\n", (data->sf2_pwm[index][nr] & 0x3f) << 2);
}

static ssize_t
store_sf2_pwm(struct device *dev, struct device_attribute *attr,
              const char *buf, size_t count)
{
        struct i2c_client *client = to_i2c_client(dev);
        struct w83793_data *data = i2c_get_clientdata(client);
        struct sensor_device_attribute_2 *sensor_attr =
            to_sensor_dev_attr_2(attr);
        int nr = sensor_attr->nr;
        int index = sensor_attr->index;
        unsigned long val;
        int err;

        err = kstrtoul(buf, 10, &val);
        if (err)
                return err;
        val = clamp_val(val, 0, 0xff) >> 2;

        mutex_lock(&data->update_lock);
        data->sf2_pwm[index][nr] =
            w83793_read_value(client, W83793_REG_SF2_PWM(index, nr)) & 0xc0;
        data->sf2_pwm[index][nr] |= val;
        w83793_write_value(client, W83793_REG_SF2_PWM(index, nr),
                                                data->sf2_pwm[index][nr]);
        mutex_unlock(&data->update_lock);
        return count;
}

static ssize_t
show_sf2_temp(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct sensor_device_attribute_2 *sensor_attr =
            to_sensor_dev_attr_2(attr);
        int nr = sensor_attr->nr;
        int index = sensor_attr->index;
        struct w83793_data *data = w83793_update_device(dev);

        return sprintf(buf, "%ld\n",
                       TEMP_FROM_REG(data->sf2_temp[index][nr] & 0x7f));
}

static ssize_t
store_sf2_temp(struct device *dev, struct device_attribute *attr,
               const char *buf, size_t count)
{
        struct i2c_client *client = to_i2c_client(dev);
        struct w83793_data *data = i2c_get_clientdata(client);
        struct sensor_device_attribute_2 *sensor_attr =
            to_sensor_dev_attr_2(attr);
        int nr = sensor_attr->nr;
        int index = sensor_attr->index;
        long val;
        int err;

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

        mutex_lock(&data->update_lock);
        data->sf2_temp[index][nr] =
            w83793_read_value(client, W83793_REG_SF2_TEMP(index, nr)) & 0x80;
        data->sf2_temp[index][nr] |= val;
        w83793_write_value(client, W83793_REG_SF2_TEMP(index, nr),
                                             data->sf2_temp[index][nr]);
        mutex_unlock(&data->update_lock);
        return count;
}

/* only Vcore A/B and Vtt have additional 2 bits precision */
static ssize_t
show_in(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct sensor_device_attribute_2 *sensor_attr =
            to_sensor_dev_attr_2(attr);
        int nr = sensor_attr->nr;
        int index = sensor_attr->index;
        struct w83793_data *data = w83793_update_device(dev);
        u16 val = data->in[index][nr];

        if (index < 3) {
                val <<= 2;
                val += (data->in_low_bits[nr] >> (index * 2)) & 0x3;
        }
        /* voltage inputs 5VDD and 5VSB needs 150mV offset */
        val = val * scale_in[index] + scale_in_add[index];
        return sprintf(buf, "%d\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 w83793_data *data = i2c_get_clientdata(client);
        unsigned long val;
        int err;

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

        mutex_lock(&data->update_lock);
        if (index > 2) {
                /* fix the limit values of 5VDD and 5VSB to ALARM mechanism */
                if (nr == 1 || nr == 2)
                        val -= scale_in_add[index] / scale_in[index];
                val = clamp_val(val, 0, 255);
        } else {
                val = clamp_val(val, 0, 0x3FF);
                data->in_low_bits[nr] =
                    w83793_read_value(client, W83793_REG_IN_LOW_BITS[nr]);

                data->in_low_bits[nr] &= ~(0x03 << (2 * index));
                data->in_low_bits[nr] |= (val & 0x03) << (2 * index);
                w83793_write_value(client, W83793_REG_IN_LOW_BITS[nr],
                                                     data->in_low_bits[nr]);
                val >>= 2;
        }
        data->in[index][nr] = val;
        w83793_write_value(client, W83793_REG_IN[index][nr],
                                                        data->in[index][nr]);
        mutex_unlock(&data->update_lock);
        return count;
}

#define NOT_USED                        -1

#define SENSOR_ATTR_IN(index)                                           \
        SENSOR_ATTR_2(in##index##_input, S_IRUGO, show_in, NULL,        \
                IN_READ, index),                                        \
        SENSOR_ATTR_2(in##index##_max, S_IRUGO | S_IWUSR, show_in,      \
                store_in, IN_MAX, index),                               \
        SENSOR_ATTR_2(in##index##_min, S_IRUGO | S_IWUSR, show_in,      \
                store_in, IN_LOW, index),                               \
        SENSOR_ATTR_2(in##index##_alarm, S_IRUGO, show_alarm_beep,      \
                NULL, ALARM_STATUS, index + ((index > 2) ? 1 : 0)),     \
        SENSOR_ATTR_2(in##index##_beep, S_IWUSR | S_IRUGO,              \
                show_alarm_beep, store_beep, BEEP_ENABLE,               \
                index + ((index > 2) ? 1 : 0))

#define SENSOR_ATTR_FAN(index)                                          \
        SENSOR_ATTR_2(fan##index##_alarm, S_IRUGO, show_alarm_beep,     \
                NULL, ALARM_STATUS, index + 17),                        \
        SENSOR_ATTR_2(fan##index##_beep, S_IWUSR | S_IRUGO,             \
                show_alarm_beep, store_beep, BEEP_ENABLE, index + 17),  \
        SENSOR_ATTR_2(fan##index##_input, S_IRUGO, show_fan,            \
                NULL, FAN_INPUT, index - 1),                            \
        SENSOR_ATTR_2(fan##index##_min, S_IWUSR | S_IRUGO,              \
                show_fan, store_fan_min, FAN_MIN, index - 1)

#define SENSOR_ATTR_PWM(index)                                          \
        SENSOR_ATTR_2(pwm##index, S_IWUSR | S_IRUGO, show_pwm,          \
                store_pwm, PWM_DUTY, index - 1),                        \
        SENSOR_ATTR_2(pwm##index##_nonstop, S_IWUSR | S_IRUGO,          \
                show_pwm, store_pwm, PWM_NONSTOP, index - 1),           \
        SENSOR_ATTR_2(pwm##index##_start, S_IWUSR | S_IRUGO,            \
                show_pwm, store_pwm, PWM_START, index - 1),             \
        SENSOR_ATTR_2(pwm##index##_stop_time, S_IWUSR | S_IRUGO,        \
                show_pwm, store_pwm, PWM_STOP_TIME, index - 1)

#define SENSOR_ATTR_TEMP(index)                                         \
        SENSOR_ATTR_2(temp##index##_type, S_IRUGO | S_IWUSR,            \
                show_temp_mode, store_temp_mode, NOT_USED, index - 1),  \
        SENSOR_ATTR_2(temp##index##_input, S_IRUGO, show_temp,          \
                NULL, TEMP_READ, index - 1),                            \
        SENSOR_ATTR_2(temp##index##_max, S_IRUGO | S_IWUSR, show_temp,  \
                store_temp, TEMP_CRIT, index - 1),                      \
        SENSOR_ATTR_2(temp##index##_max_hyst, S_IRUGO | S_IWUSR,        \
                show_temp, store_temp, TEMP_CRIT_HYST, index - 1),      \
        SENSOR_ATTR_2(temp##index##_warn, S_IRUGO | S_IWUSR, show_temp, \
                store_temp, TEMP_WARN, index - 1),                      \
        SENSOR_ATTR_2(temp##index##_warn_hyst, S_IRUGO | S_IWUSR,       \
                show_temp, store_temp, TEMP_WARN_HYST, index - 1),      \
        SENSOR_ATTR_2(temp##index##_alarm, S_IRUGO,                     \
                show_alarm_beep, NULL, ALARM_STATUS, index + 11),       \
        SENSOR_ATTR_2(temp##index##_beep, S_IWUSR | S_IRUGO,            \
                show_alarm_beep, store_beep, BEEP_ENABLE, index + 11),  \
        SENSOR_ATTR_2(temp##index##_auto_channels_pwm,                  \
                S_IRUGO | S_IWUSR, show_sf_ctrl, store_sf_ctrl,         \
                TEMP_FAN_MAP, index - 1),                               \
        SENSOR_ATTR_2(temp##index##_pwm_enable, S_IWUSR | S_IRUGO,      \
                show_sf_ctrl, store_sf_ctrl, TEMP_PWM_ENABLE,           \
                index - 1),                                             \
        SENSOR_ATTR_2(thermal_cruise##index, S_IRUGO | S_IWUSR,         \
                show_sf_ctrl, store_sf_ctrl, TEMP_CRUISE, index - 1),   \
        SENSOR_ATTR_2(tolerance##index, S_IRUGO | S_IWUSR, show_sf_ctrl,\
                store_sf_ctrl, TEMP_TOLERANCE, index - 1),              \
        SENSOR_ATTR_2(temp##index##_auto_point1_pwm, S_IRUGO | S_IWUSR, \
                show_sf2_pwm, store_sf2_pwm, 0, index - 1),             \
        SENSOR_ATTR_2(temp##index##_auto_point2_pwm, S_IRUGO | S_IWUSR, \
                show_sf2_pwm, store_sf2_pwm, 1, index - 1),             \
        SENSOR_ATTR_2(temp##index##_auto_point3_pwm, S_IRUGO | S_IWUSR, \
                show_sf2_pwm, store_sf2_pwm, 2, index - 1),             \
        SENSOR_ATTR_2(temp##index##_auto_point4_pwm, S_IRUGO | S_IWUSR, \
                show_sf2_pwm, store_sf2_pwm, 3, index - 1),             \
        SENSOR_ATTR_2(temp##index##_auto_point5_pwm, S_IRUGO | S_IWUSR, \
                show_sf2_pwm, store_sf2_pwm, 4, index - 1),             \
        SENSOR_ATTR_2(temp##index##_auto_point6_pwm, S_IRUGO | S_IWUSR, \
                show_sf2_pwm, store_sf2_pwm, 5, index - 1),             \
        SENSOR_ATTR_2(temp##index##_auto_point7_pwm, S_IRUGO | S_IWUSR, \
                show_sf2_pwm, store_sf2_pwm, 6, index - 1),             \
        SENSOR_ATTR_2(temp##index##_auto_point1_temp, S_IRUGO | S_IWUSR,\
                show_sf2_temp, store_sf2_temp, 0, index - 1),           \
        SENSOR_ATTR_2(temp##index##_auto_point2_temp, S_IRUGO | S_IWUSR,\
                show_sf2_temp, store_sf2_temp, 1, index - 1),           \
        SENSOR_ATTR_2(temp##index##_auto_point3_temp, S_IRUGO | S_IWUSR,\
                show_sf2_temp, store_sf2_temp, 2, index - 1),           \
        SENSOR_ATTR_2(temp##index##_auto_point4_temp, S_IRUGO | S_IWUSR,\
                show_sf2_temp, store_sf2_temp, 3, index - 1),           \
        SENSOR_ATTR_2(temp##index##_auto_point5_temp, S_IRUGO | S_IWUSR,\
                show_sf2_temp, store_sf2_temp, 4, index - 1),           \
        SENSOR_ATTR_2(temp##index##_auto_point6_temp, S_IRUGO | S_IWUSR,\
                show_sf2_temp, store_sf2_temp, 5, index - 1),           \
        SENSOR_ATTR_2(temp##index##_auto_point7_temp, S_IRUGO | S_IWUSR,\
                show_sf2_temp, store_sf2_temp, 6, index - 1)

static struct sensor_device_attribute_2 w83793_sensor_attr_2[] = {
        SENSOR_ATTR_IN(0),
        SENSOR_ATTR_IN(1),
        SENSOR_ATTR_IN(2),
        SENSOR_ATTR_IN(3),
        SENSOR_ATTR_IN(4),
        SENSOR_ATTR_IN(5),
        SENSOR_ATTR_IN(6),
        SENSOR_ATTR_IN(7),
        SENSOR_ATTR_IN(8),
        SENSOR_ATTR_IN(9),
        SENSOR_ATTR_FAN(1),
        SENSOR_ATTR_FAN(2),
        SENSOR_ATTR_FAN(3),
        SENSOR_ATTR_FAN(4),
        SENSOR_ATTR_FAN(5),
        SENSOR_ATTR_PWM(1),
        SENSOR_ATTR_PWM(2),
        SENSOR_ATTR_PWM(3),
};

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

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

/* Pwm4-Pwm8 */
static struct sensor_device_attribute_2 w83793_left_pwm[] = {
        SENSOR_ATTR_PWM(4),
        SENSOR_ATTR_PWM(5),
        SENSOR_ATTR_PWM(6),
        SENSOR_ATTR_PWM(7),
        SENSOR_ATTR_PWM(8),
};

static struct sensor_device_attribute_2 w83793_vid[] = {
        SENSOR_ATTR_2(cpu0_vid, S_IRUGO, show_vid, NULL, NOT_USED, 0),
        SENSOR_ATTR_2(cpu1_vid, S_IRUGO, show_vid, NULL, NOT_USED, 1),
};
static DEVICE_ATTR_RW(vrm);

static struct sensor_device_attribute_2 sda_single_files[] = {
        SENSOR_ATTR_2(intrusion0_alarm, S_IWUSR | S_IRUGO, show_alarm_beep,
                      store_chassis_clear, ALARM_STATUS, 30),
        SENSOR_ATTR_2(beep_enable, S_IWUSR | S_IRUGO, show_beep_enable,
                      store_beep_enable, NOT_USED, NOT_USED),
        SENSOR_ATTR_2(pwm_default, S_IWUSR | S_IRUGO, show_sf_setup,
                      store_sf_setup, SETUP_PWM_DEFAULT, NOT_USED),
        SENSOR_ATTR_2(pwm_uptime, S_IWUSR | S_IRUGO, show_sf_setup,
                      store_sf_setup, SETUP_PWM_UPTIME, NOT_USED),
        SENSOR_ATTR_2(pwm_downtime, S_IWUSR | S_IRUGO, show_sf_setup,
                      store_sf_setup, SETUP_PWM_DOWNTIME, NOT_USED),
        SENSOR_ATTR_2(temp_critical, S_IWUSR | S_IRUGO, show_sf_setup,
                      store_sf_setup, SETUP_TEMP_CRITICAL, NOT_USED),
};

static void w83793_init_client(struct i2c_client *client)
{
        if (reset)
                w83793_write_value(client, W83793_REG_CONFIG, 0x80);

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

/*
 * Watchdog routines
 */

static int watchdog_set_timeout(struct w83793_data *data, int timeout)
{
        unsigned int mtimeout;
        int ret;

        mtimeout = DIV_ROUND_UP(timeout, 60);

        if (mtimeout > 255)
                return -EINVAL;

        mutex_lock(&data->watchdog_lock);
        if (!data->client) {
                ret = -ENODEV;
                goto leave;
        }

        data->watchdog_timeout = mtimeout;

        /* Set Timeout value (in Minutes) */
        w83793_write_value(data->client, W83793_REG_WDT_TIMEOUT,
                           data->watchdog_timeout);

        ret = mtimeout * 60;

leave:
        mutex_unlock(&data->watchdog_lock);
        return ret;
}

static int watchdog_get_timeout(struct w83793_data *data)
{
        int timeout;

        mutex_lock(&data->watchdog_lock);
        timeout = data->watchdog_timeout * 60;
        mutex_unlock(&data->watchdog_lock);

        return timeout;
}

static int watchdog_trigger(struct w83793_data *data)
{
        int ret = 0;

        mutex_lock(&data->watchdog_lock);
        if (!data->client) {
                ret = -ENODEV;
                goto leave;
        }

        /* Set Timeout value (in Minutes) */
        w83793_write_value(data->client, W83793_REG_WDT_TIMEOUT,
                           data->watchdog_timeout);

leave:
        mutex_unlock(&data->watchdog_lock);
        return ret;
}

static int watchdog_enable(struct w83793_data *data)
{
        int ret = 0;

        mutex_lock(&data->watchdog_lock);
        if (!data->client) {
                ret = -ENODEV;
                goto leave;
        }

        /* Set initial timeout */
        w83793_write_value(data->client, W83793_REG_WDT_TIMEOUT,
                           data->watchdog_timeout);

        /* Enable Soft Watchdog */
        w83793_write_value(data->client, W83793_REG_WDT_LOCK, 0x55);

leave:
        mutex_unlock(&data->watchdog_lock);
        return ret;
}

static int watchdog_disable(struct w83793_data *data)
{
        int ret = 0;

        mutex_lock(&data->watchdog_lock);
        if (!data->client) {
                ret = -ENODEV;
                goto leave;
        }

        /* Disable Soft Watchdog */
        w83793_write_value(data->client, W83793_REG_WDT_LOCK, 0xAA);

leave:
        mutex_unlock(&data->watchdog_lock);
        return ret;
}

static int watchdog_open(struct inode *inode, struct file *filp)
{
        struct w83793_data *pos, *data = NULL;
        int watchdog_is_open;

        /*
         * We get called from drivers/char/misc.c with misc_mtx hold, and we
         * call misc_register() from  w83793_probe() with watchdog_data_mutex
         * hold, as misc_register() takes the misc_mtx lock, this is a possible
         * deadlock, so we use mutex_trylock here.
         */
        if (!mutex_trylock(&watchdog_data_mutex))
                return -ERESTARTSYS;
        list_for_each_entry(pos, &watchdog_data_list, list) {
                if (pos->watchdog_miscdev.minor == iminor(inode)) {
                        data = pos;
                        break;
                }
        }

        /* Check, if device is already open */
        watchdog_is_open = test_and_set_bit(0, &data->watchdog_is_open);

        /*
         * Increase data reference counter (if not already done).
         * Note we can never not have found data, so we don't check for this
         */
        if (!watchdog_is_open)
                kref_get(&data->kref);

        mutex_unlock(&watchdog_data_mutex);

        /* Check, if device is already open and possibly issue error */
        if (watchdog_is_open)
                return -EBUSY;

        /* Enable Soft Watchdog */
        watchdog_enable(data);

        /* Store pointer to data into filp's private data */
        filp->private_data = data;

        return stream_open(inode, filp);
}

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

        if (data->watchdog_expect_close) {
                watchdog_disable(data);
                data->watchdog_expect_close = 0;
        } else {
                watchdog_trigger(data);
                dev_crit(&data->client->dev,
                        "unexpected close, not stopping watchdog!\n");
        }

        clear_bit(0, &data->watchdog_is_open);

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

        return 0;
}

static ssize_t watchdog_write(struct file *filp, const char __user *buf,
        size_t count, loff_t *offset)
{
        ssize_t ret;
        struct w83793_data *data = filp->private_data;

        if (count) {
                if (!nowayout) {
                        size_t i;

                        /* Clear it in case it was set with a previous write */
                        data->watchdog_expect_close = 0;

                        for (i = 0; i != count; i++) {
                                char c;
                                if (get_user(c, buf + i))
                                        return -EFAULT;
                                if (c == 'V')
                                        data->watchdog_expect_close = 1;
                        }
                }
                ret = watchdog_trigger(data);
                if (ret < 0)
                        return ret;
        }
        return count;
}

static long watchdog_ioctl(struct file *filp, unsigned int cmd,
                           unsigned long arg)
{
        struct watchdog_info ident = {
                .options = WDIOF_KEEPALIVEPING |
                           WDIOF_SETTIMEOUT |
                           WDIOF_CARDRESET,
                .identity = "w83793 watchdog"
        };

        int val, ret = 0;
        struct w83793_data *data = filp->private_data;

        switch (cmd) {
        case WDIOC_GETSUPPORT:
                if (!nowayout)
                        ident.options |= WDIOF_MAGICCLOSE;
                if (copy_to_user((void __user *)arg, &ident, sizeof(ident)))
                        ret = -EFAULT;
                break;

        case WDIOC_GETSTATUS:
                val = data->watchdog_caused_reboot ? WDIOF_CARDRESET : 0;
                ret = put_user(val, (int __user *)arg);
                break;

        case WDIOC_GETBOOTSTATUS:
                ret = put_user(0, (int __user *)arg);
                break;

        case WDIOC_KEEPALIVE:
                ret = watchdog_trigger(data);
                break;

        case WDIOC_GETTIMEOUT:
                val = watchdog_get_timeout(data);
                ret = put_user(val, (int __user *)arg);
                break;

        case WDIOC_SETTIMEOUT:
                if (get_user(val, (int __user *)arg)) {
                        ret = -EFAULT;
                        break;
                }
                ret = watchdog_set_timeout(data, val);
                if (ret > 0)
                        ret = put_user(ret, (int __user *)arg);
                break;

        case WDIOC_SETOPTIONS:
                if (get_user(val, (int __user *)arg)) {
                        ret = -EFAULT;
                        break;
                }

                if (val & WDIOS_DISABLECARD)
                        ret = watchdog_disable(data);
                else if (val & WDIOS_ENABLECARD)
                        ret = watchdog_enable(data);
                else
                        ret = -EINVAL;

                break;
        default:
                ret = -ENOTTY;
        }
        return ret;
}

static const struct file_operations watchdog_fops = {
        .owner = THIS_MODULE,
        .llseek = no_llseek,
        .open = watchdog_open,
        .release = watchdog_close,
        .write = watchdog_write,
        .unlocked_ioctl = watchdog_ioctl,
        .compat_ioctl = compat_ptr_ioctl,
};

/*
 *      Notifier for system down
 */

static int watchdog_notify_sys(struct notifier_block *this, unsigned long code,
                               void *unused)
{
        struct w83793_data *data = NULL;

        if (code == SYS_DOWN || code == SYS_HALT) {

                /* Disable each registered watchdog */
                mutex_lock(&watchdog_data_mutex);
                list_for_each_entry(data, &watchdog_data_list, list) {
                        if (data->watchdog_miscdev.minor)
                                watchdog_disable(data);
                }
                mutex_unlock(&watchdog_data_mutex);
        }

        return NOTIFY_DONE;
}

/*
 *      The WDT needs to learn about soft shutdowns in order to
 *      turn the timebomb registers off.
 */

static struct notifier_block watchdog_notifier = {
        .notifier_call = watchdog_notify_sys,
};

/*
 * Init / remove routines
 */

static int w83793_remove(struct i2c_client *client)
{
        struct w83793_data *data = i2c_get_clientdata(client);
        struct device *dev = &client->dev;
        int i, tmp;

        /* Unregister the watchdog (if registered) */
        if (data->watchdog_miscdev.minor) {
                misc_deregister(&data->watchdog_miscdev);

                if (data->watchdog_is_open) {
                        dev_warn(&client->dev,
                                "i2c client detached with watchdog open! "
                                "Stopping watchdog.\n");
                        watchdog_disable(data);
                }

                mutex_lock(&watchdog_data_mutex);
                list_del(&data->list);
                mutex_unlock(&watchdog_data_mutex);

                /* Tell the watchdog code the client is gone */
                mutex_lock(&data->watchdog_lock);
                data->client = NULL;
                mutex_unlock(&data->watchdog_lock);
        }

        /* Reset Configuration Register to Disable Watch Dog Registers */
        tmp = w83793_read_value(client, W83793_REG_CONFIG);
        w83793_write_value(client, W83793_REG_CONFIG, tmp & ~0x04);

        unregister_reboot_notifier(&watchdog_notifier);

        hwmon_device_unregister(data->hwmon_dev);

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

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

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

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

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

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

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

        return 0;
}

static int
w83793_detect_subclients(struct i2c_client *client)
{
        int i, id;
        int address = client->addr;
        u8 tmp;
        struct i2c_adapter *adapter = client->adapter;
        struct w83793_data *data = i2c_get_clientdata(client);

        id = i2c_adapter_id(adapter);
        if (force_subclients[0] == id && force_subclients[1] == address) {
                for (i = 2; i <= 3; i++) {
                        if (force_subclients[i] < 0x48
                            || force_subclients[i] > 0x4f) {
                                dev_err(&client->dev,
                                        "invalid subclient "
                                        "address %d; must be 0x48-0x4f\n",
                                        force_subclients[i]);
                                return -EINVAL;
                        }
                }
                w83793_write_value(client, W83793_REG_I2C_SUBADDR,
                                   (force_subclients[2] & 0x07) |
                                   ((force_subclients[3] & 0x07) << 4));
        }

        tmp = w83793_read_value(client, W83793_REG_I2C_SUBADDR);
        if (!(tmp & 0x08))
                data->lm75[0] = devm_i2c_new_dummy_device(&client->dev, adapter,
                                                          0x48 + (tmp & 0x7));
        if (!(tmp & 0x80)) {
                if (!IS_ERR(data->lm75[0])
                    && ((tmp & 0x7) == ((tmp >> 4) & 0x7))) {
                        dev_err(&client->dev,
                                "duplicate addresses 0x%x, "
                                "use force_subclients\n", data->lm75[0]->addr);
                        return -ENODEV;
                }
                data->lm75[1] = devm_i2c_new_dummy_device(&client->dev, adapter,
                                                          0x48 + ((tmp >> 4) & 0x7));
        }

        return 0;
}

/* Return 0 if detection is successful, -ENODEV otherwise */
static int w83793_detect(struct i2c_client *client,
                         struct i2c_board_info *info)
{
        u8 tmp, bank, chip_id;
        struct i2c_adapter *adapter = client->adapter;
        unsigned short address = client->addr;

        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
                return -ENODEV;

        bank = i2c_smbus_read_byte_data(client, W83793_REG_BANKSEL);

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

        /*
         * If Winbond chip, address of chip and W83793_REG_I2C_ADDR
         * should match
         */
        if ((bank & 0x07) == 0
         && i2c_smbus_read_byte_data(client, W83793_REG_I2C_ADDR) !=
            (address << 1)) {
                pr_debug("w83793: Detection failed at check i2c addr\n");
                return -ENODEV;
        }

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

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

        return 0;
}

static int w83793_probe(struct i2c_client *client,
                        const struct i2c_device_id *id)
{
        struct device *dev = &client->dev;
        static const int watchdog_minors[] = {
                WATCHDOG_MINOR, 212, 213, 214, 215
        };
        struct w83793_data *data;
        int i, tmp, val, err;
        int files_fan = ARRAY_SIZE(w83793_left_fan) / 7;
        int files_pwm = ARRAY_SIZE(w83793_left_pwm) / 5;
        int files_temp = ARRAY_SIZE(w83793_temp) / 6;

        data = kzalloc(sizeof(struct w83793_data), GFP_KERNEL);
        if (!data) {
                err = -ENOMEM;
                goto exit;
        }

        i2c_set_clientdata(client, data);
        data->bank = i2c_smbus_read_byte_data(client, W83793_REG_BANKSEL);
        mutex_init(&data->update_lock);
        mutex_init(&data->watchdog_lock);
        INIT_LIST_HEAD(&data->list);
        kref_init(&data->kref);

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

        err = w83793_detect_subclients(client);
        if (err)
                goto free_mem;

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

        /*
         * Only fan 1-5 has their own input pins,
         * Pwm 1-3 has their own pins
         */
        data->has_fan = 0x1f;
        data->has_pwm = 0x07;
        tmp = w83793_read_value(client, W83793_REG_MFC);
        val = w83793_read_value(client, W83793_REG_FANIN_CTRL);

        /* check the function of pins 49-56 */
        if (tmp & 0x80) {
                data->has_vid |= 0x2;   /* has VIDB */
        } else {
                data->has_pwm |= 0x18;  /* pwm 4,5 */
                if (val & 0x01) {       /* fan 6 */
                        data->has_fan |= 0x20;
                        data->has_pwm |= 0x20;
                }
                if (val & 0x02) {       /* fan 7 */
                        data->has_fan |= 0x40;
                        data->has_pwm |= 0x40;
                }
                if (!(tmp & 0x40) && (val & 0x04)) {    /* fan 8 */
                        data->has_fan |= 0x80;
                        data->has_pwm |= 0x80;
                }
        }

        /* check the function of pins 37-40 */
        if (!(tmp & 0x29))
                data->has_vid |= 0x1;   /* has VIDA */
        if (0x08 == (tmp & 0x0c)) {
                if (val & 0x08) /* fan 9 */
                        data->has_fan |= 0x100;
                if (val & 0x10) /* fan 10 */
                        data->has_fan |= 0x200;
        }
        if (0x20 == (tmp & 0x30)) {
                if (val & 0x20) /* fan 11 */
                        data->has_fan |= 0x400;
                if (val & 0x40) /* fan 12 */
                        data->has_fan |= 0x800;
        }

        if ((tmp & 0x01) && (val & 0x04)) {     /* fan 8, second location */
                data->has_fan |= 0x80;
                data->has_pwm |= 0x80;
        }

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

        /* check the temp1-6 mode, ignore former AMDSI selected inputs */
        tmp = w83793_read_value(client, W83793_REG_TEMP_MODE[0]);
        if (tmp & 0x01)
                data->has_temp |= 0x01;
        if (tmp & 0x04)
                data->has_temp |= 0x02;
        if (tmp & 0x10)
                data->has_temp |= 0x04;
        if (tmp & 0x40)
                data->has_temp |= 0x08;

        tmp = w83793_read_value(client, W83793_REG_TEMP_MODE[1]);
        if (tmp & 0x01)
                data->has_temp |= 0x10;
        if (tmp & 0x02)
                data->has_temp |= 0x20;

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

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

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

        }

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

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

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

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

        /* Watchdog initialization */

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

        /*
         * Enable Watchdog registers.
         * Set Configuration Register to Enable Watch Dog Registers
         * (Bit 2) = XXXX, X1XX.
         */
        tmp = w83793_read_value(client, W83793_REG_CONFIG);
        w83793_write_value(client, W83793_REG_CONFIG, tmp | 0x04);

        /* Set the default watchdog timeout */
        data->watchdog_timeout = timeout;

        /* Check, if last reboot was caused by watchdog */
        data->watchdog_caused_reboot =
          w83793_read_value(data->client, W83793_REG_WDT_STATUS) & 0x01;

        /* Disable Soft Watchdog during initialiation */
        watchdog_disable(data);

        /*
         * We take the data_mutex lock early so that watchdog_open() cannot
         * run when misc_register() has completed, but we've not yet added
         * our data to the watchdog_data_list (and set the default timeout)
         */
        mutex_lock(&watchdog_data_mutex);
        for (i = 0; i < ARRAY_SIZE(watchdog_minors); i++) {
                /* Register our watchdog part */
                snprintf(data->watchdog_name, sizeof(data->watchdog_name),
                        "watchdog%c", (i == 0) ? '\0' : ('0' + i));
                data->watchdog_miscdev.name = data->watchdog_name;
                data->watchdog_miscdev.fops = &watchdog_fops;
                data->watchdog_miscdev.minor = watchdog_minors[i];

                err = misc_register(&data->watchdog_miscdev);
                if (err == -EBUSY)
                        continue;
                if (err) {
                        data->watchdog_miscdev.minor = 0;
                        dev_err(&client->dev,
                                "Registering watchdog chardev: %d\n", err);
                        break;
                }

                list_add(&data->list, &watchdog_data_list);

                dev_info(&client->dev,
                        "Registered watchdog chardev major 10, minor: %d\n",
                        watchdog_minors[i]);
                break;
        }
        if (i == ARRAY_SIZE(watchdog_minors)) {
                data->watchdog_miscdev.minor = 0;
                dev_warn(&client->dev,
                         "Couldn't register watchdog chardev (due to no free minor)\n");
        }

        mutex_unlock(&watchdog_data_mutex);

        return 0;

        /* Unregister hwmon device */

exit_devunreg:

        hwmon_device_unregister(data->hwmon_dev);

        /* Unregister sysfs hooks */

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

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

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

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

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

        for (i = 0; i < ARRAY_SIZE(w83793_temp); i++)
                device_remove_file(dev, &w83793_temp[i].dev_attr);
free_mem:
        kfree(data);
exit:
        return err;
}

static void w83793_update_nonvolatile(struct device *dev)
{
        struct i2c_client *client = to_i2c_client(dev);
        struct w83793_data *data = i2c_get_clientdata(client);
        int i, j;
        /*
         * They are somewhat "stable" registers, and to update them every time
         * takes so much time, it's just not worthy. Update them in a long
         * interval to avoid exception.
         */
        if (!(time_after(jiffies, data->last_nonvolatile + HZ * 300)
              || !data->valid))
                return;
        /* update voltage limits */
        for (i = 1; i < 3; i++) {
                for (j = 0; j < ARRAY_SIZE(data->in); j++) {
                        data->in[j][i] =
                            w83793_read_value(client, W83793_REG_IN[j][i]);
                }
                data->in_low_bits[i] =
                    w83793_read_value(client, W83793_REG_IN_LOW_BITS[i]);
        }

        for (i = 0; i < ARRAY_SIZE(data->fan_min); i++) {
                /* Update the Fan measured value and limits */
                if (!(data->has_fan & (1 << i)))
                        continue;
                data->fan_min[i] =
                    w83793_read_value(client, W83793_REG_FAN_MIN(i)) << 8;
                data->fan_min[i] |=
                    w83793_read_value(client, W83793_REG_FAN_MIN(i) + 1);
        }

        for (i = 0; i < ARRAY_SIZE(data->temp_fan_map); i++) {
                if (!(data->has_temp & (1 << i)))
                        continue;
                data->temp_fan_map[i] =
                    w83793_read_value(client, W83793_REG_TEMP_FAN_MAP(i));
                for (j = 1; j < 5; j++) {
                        data->temp[i][j] =
                            w83793_read_value(client, W83793_REG_TEMP[i][j]);
                }
                data->temp_cruise[i] =
                    w83793_read_value(client, W83793_REG_TEMP_CRUISE(i));
                for (j = 0; j < 7; j++) {
                        data->sf2_pwm[i][j] =
                            w83793_read_value(client, W83793_REG_SF2_PWM(i, j));
                        data->sf2_temp[i][j] =
                            w83793_read_value(client,
                                              W83793_REG_SF2_TEMP(i, j));
                }
        }

        for (i = 0; i < ARRAY_SIZE(data->temp_mode); i++)
                data->temp_mode[i] =
                    w83793_read_value(client, W83793_REG_TEMP_MODE[i]);

        for (i = 0; i < ARRAY_SIZE(data->tolerance); i++) {
                data->tolerance[i] =
                    w83793_read_value(client, W83793_REG_TEMP_TOL(i));
        }

        for (i = 0; i < ARRAY_SIZE(data->pwm); i++) {
                if (!(data->has_pwm & (1 << i)))
                        continue;
                data->pwm[i][PWM_NONSTOP] =
                    w83793_read_value(client, W83793_REG_PWM(i, PWM_NONSTOP));
                data->pwm[i][PWM_START] =
                    w83793_read_value(client, W83793_REG_PWM(i, PWM_START));
                data->pwm_stop_time[i] =
                    w83793_read_value(client, W83793_REG_PWM_STOP_TIME(i));
        }

        data->pwm_default = w83793_read_value(client, W83793_REG_PWM_DEFAULT);
        data->pwm_enable = w83793_read_value(client, W83793_REG_PWM_ENABLE);
        data->pwm_uptime = w83793_read_value(client, W83793_REG_PWM_UPTIME);
        data->pwm_downtime = w83793_read_value(client, W83793_REG_PWM_DOWNTIME);
        data->temp_critical =
            w83793_read_value(client, W83793_REG_TEMP_CRITICAL);
        data->beep_enable = w83793_read_value(client, W83793_REG_OVT_BEEP);

        for (i = 0; i < ARRAY_SIZE(data->beeps); i++)
                data->beeps[i] = w83793_read_value(client, W83793_REG_BEEP(i));

        data->last_nonvolatile = jiffies;
}

static struct w83793_data *w83793_update_device(struct device *dev)
{
        struct i2c_client *client = to_i2c_client(dev);
        struct w83793_data *data = i2c_get_clientdata(client);
        int i;

        mutex_lock(&data->update_lock);

        if (!(time_after(jiffies, data->last_updated + HZ * 2)
              || !data->valid))
                goto END;

        /* Update the voltages measured value and limits */
        for (i = 0; i < ARRAY_SIZE(data->in); i++)
                data->in[i][IN_READ] =
                    w83793_read_value(client, W83793_REG_IN[i][IN_READ]);

        data->in_low_bits[IN_READ] =
            w83793_read_value(client, W83793_REG_IN_LOW_BITS[IN_READ]);

        for (i = 0; i < ARRAY_SIZE(data->fan); i++) {
                if (!(data->has_fan & (1 << i)))
                        continue;
                data->fan[i] =
                    w83793_read_value(client, W83793_REG_FAN(i)) << 8;
                data->fan[i] |=
                    w83793_read_value(client, W83793_REG_FAN(i) + 1);
        }

        for (i = 0; i < ARRAY_SIZE(data->temp); i++) {
                if (!(data->has_temp & (1 << i)))
                        continue;
                data->temp[i][TEMP_READ] =
                    w83793_read_value(client, W83793_REG_TEMP[i][TEMP_READ]);
        }

        data->temp_low_bits =
            w83793_read_value(client, W83793_REG_TEMP_LOW_BITS);

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

        for (i = 0; i < ARRAY_SIZE(data->alarms); i++)
                data->alarms[i] =
                    w83793_read_value(client, W83793_REG_ALARM(i));
        if (data->has_vid & 0x01)
                data->vid[0] = w83793_read_value(client, W83793_REG_VID_INA);
        if (data->has_vid & 0x02)
                data->vid[1] = w83793_read_value(client, W83793_REG_VID_INB);
        w83793_update_nonvolatile(dev);
        data->last_updated = jiffies;
        data->valid = 1;

END:
        mutex_unlock(&data->update_lock);
        return data;
}

/*
 * Ignore the possibility that somebody change bank outside the driver
 * Must be called with data->update_lock held, except during initialization
 */
static u8 w83793_read_value(struct i2c_client *client, u16 reg)
{
        struct w83793_data *data = i2c_get_clientdata(client);
        u8 res;
        u8 new_bank = reg >> 8;

        new_bank |= data->bank & 0xfc;
        if (data->bank != new_bank) {
                if (i2c_smbus_write_byte_data
                    (client, W83793_REG_BANKSEL, new_bank) >= 0)
                        data->bank = new_bank;
                else {
                        dev_err(&client->dev,
                                "set bank to %d failed, fall back "
                                "to bank %d, read reg 0x%x error\n",
                                new_bank, data->bank, reg);
                        res = 0x0;      /* read 0x0 from the chip */
                        goto END;
                }
        }
        res = i2c_smbus_read_byte_data(client, reg & 0xff);
END:
        return res;
}

/* Must be called with data->update_lock held, except during initialization */
static int w83793_write_value(struct i2c_client *client, u16 reg, u8 value)
{
        struct w83793_data *data = i2c_get_clientdata(client);
        int res;
        u8 new_bank = reg >> 8;

        new_bank |= data->bank & 0xfc;
        if (data->bank != new_bank) {
                res = i2c_smbus_write_byte_data(client, W83793_REG_BANKSEL,
                                                new_bank);
                if (res < 0) {
                        dev_err(&client->dev,
                                "set bank to %d failed, fall back "
                                "to bank %d, write reg 0x%x error\n",
                                new_bank, data->bank, reg);
                        goto END;
                }
                data->bank = new_bank;
        }

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

module_i2c_driver(w83793_driver);

MODULE_AUTHOR("Yuan Mu, Sven Anders");
MODULE_DESCRIPTION("w83793 driver");
MODULE_LICENSE("GPL");