w83793.c

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/*
 * w83793.c - Linux kernel driver for hardware monitoring
 * Copyright (C) 2006 Winbond Electronics Corp.
 *        Yuan Mu
 *        Rudolf Marek <[email protected]>
 * Copyright (C) 2009-2010 Sven Anders <[email protected]>, ANDURAS AG.
 *      Watchdog driver part
 *      (Based partially on fschmd driver,
 *       Copyright 2007-2008 by Hans de Goede)
 *
 * 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   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 SENSORS_LIMIT((1350000 + (rpm >> 1)) / rpm, 1, 0xffe);
}

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

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

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

static inline s8 TEMP_TO_REG(long val, s8 min, s8 max)
{
    return SENSORS_LIMIT((val + (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
show_vrm(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
store_vrm(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;

    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 = SENSORS_LIMIT(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 |= SENSORS_LIMIT(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 transfrom 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 = SENSORS_LIMIT(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 = SENSORS_LIMIT(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 = SENSORS_LIMIT(val, 0, 255);
    } else {
        val = SENSORS_LIMIT(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(vrm, S_IWUSR | S_IRUGO, show_vrm, store_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)
{
    int ret, mtimeout;

    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 nonseekable_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,
};

/*
 *  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);

    if (data->lm75[0] != NULL)
        i2c_unregister_device(data->lm75[0]);
    if (data->lm75[1] != NULL)
        i2c_unregister_device(data->lm75[1]);

    /* 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, err;
    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]);
                err = -EINVAL;
                goto ERROR_SC_0;
            }
        }
        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] = i2c_new_dummy(adapter, 0x48 + (tmp & 0x7));
    if (!(tmp & 0x80)) {
        if ((data->lm75[0] != NULL)
            && ((tmp & 0x7) == ((tmp >> 4) & 0x7))) {
            dev_err(&client->dev,
                "duplicate addresses 0x%x, "
                "use force_subclients\n", data->lm75[0]->addr);
            err = -ENODEV;
            goto ERROR_SC_1;
        }
        data->lm75[1] = i2c_new_dummy(adapter,
                          0x48 + ((tmp >> 4) & 0x7));
    }

    return 0;

    /* Undo inits in case of errors */

ERROR_SC_1:
    if (data->lm75[0] != NULL)
        i2c_unregister_device(data->lm75[0]);
ERROR_SC_0:
    return err;
}

/* 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;
    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);

    if (data->lm75[0] != NULL)
        i2c_unregister_device(data->lm75[0]);
    if (data->lm75[1] != NULL)
        i2c_unregister_device(data->lm75[1]);
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 = 0xff;
    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");