// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * w83791d.c - Part of lm_sensors, Linux kernel modules for hardware
 *             monitoring
 *
 * Copyright (C) 2006-2007 Charles Spirakis <bezaur@gmail.com>
 */

/*
 * Supports following chips:
 *
 * Chip         #vin    #fanin  #pwm    #temp   wchipid vendid  i2c     ISA
 * w83791d      10      5       5       3       0x71    0x5ca3  yes     no
 *
 * The w83791d chip appears to be part way between the 83781d and the
 * 83792d. Thus, this file is derived from both the w83792d.c and
 * w83781d.c files.
 *
 * The w83791g chip is the same as the w83791d but lead-free.
 */

#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/jiffies.h>

#define NUMBER_OF_VIN           10
#define NUMBER_OF_FANIN         5
#define NUMBER_OF_TEMPIN        3
#define NUMBER_OF_PWM           5

/* 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 one to force a hardware chip reset");

static bool init;
module_param(init, bool, 0);
MODULE_PARM_DESC(init, "Set to one to force extra software initialization");

/* The W83791D registers */
static const u8 W83791D_REG_IN[NUMBER_OF_VIN] = {
        0x20,                   /* VCOREA in DataSheet */
        0x21,                   /* VINR0 in DataSheet */
        0x22,                   /* +3.3VIN in DataSheet */
        0x23,                   /* VDD5V in DataSheet */
        0x24,                   /* +12VIN in DataSheet */
        0x25,                   /* -12VIN in DataSheet */
        0x26,                   /* -5VIN in DataSheet */
        0xB0,                   /* 5VSB in DataSheet */
        0xB1,                   /* VBAT in DataSheet */
        0xB2                    /* VINR1 in DataSheet */
};

static const u8 W83791D_REG_IN_MAX[NUMBER_OF_VIN] = {
        0x2B,                   /* VCOREA High Limit in DataSheet */
        0x2D,                   /* VINR0 High Limit in DataSheet */
        0x2F,                   /* +3.3VIN High Limit in DataSheet */
        0x31,                   /* VDD5V High Limit in DataSheet */
        0x33,                   /* +12VIN High Limit in DataSheet */
        0x35,                   /* -12VIN High Limit in DataSheet */
        0x37,                   /* -5VIN High Limit in DataSheet */
        0xB4,                   /* 5VSB High Limit in DataSheet */
        0xB6,                   /* VBAT High Limit in DataSheet */
        0xB8                    /* VINR1 High Limit in DataSheet */
};
static const u8 W83791D_REG_IN_MIN[NUMBER_OF_VIN] = {
        0x2C,                   /* VCOREA Low Limit in DataSheet */
        0x2E,                   /* VINR0 Low Limit in DataSheet */
        0x30,                   /* +3.3VIN Low Limit in DataSheet */
        0x32,                   /* VDD5V Low Limit in DataSheet */
        0x34,                   /* +12VIN Low Limit in DataSheet */
        0x36,                   /* -12VIN Low Limit in DataSheet */
        0x38,                   /* -5VIN Low Limit in DataSheet */
        0xB5,                   /* 5VSB Low Limit in DataSheet */
        0xB7,                   /* VBAT Low Limit in DataSheet */
        0xB9                    /* VINR1 Low Limit in DataSheet */
};
static const u8 W83791D_REG_FAN[NUMBER_OF_FANIN] = {
        0x28,                   /* FAN 1 Count in DataSheet */
        0x29,                   /* FAN 2 Count in DataSheet */
        0x2A,                   /* FAN 3 Count in DataSheet */
        0xBA,                   /* FAN 4 Count in DataSheet */
        0xBB,                   /* FAN 5 Count in DataSheet */
};
static const u8 W83791D_REG_FAN_MIN[NUMBER_OF_FANIN] = {
        0x3B,                   /* FAN 1 Count Low Limit in DataSheet */
        0x3C,                   /* FAN 2 Count Low Limit in DataSheet */
        0x3D,                   /* FAN 3 Count Low Limit in DataSheet */
        0xBC,                   /* FAN 4 Count Low Limit in DataSheet */
        0xBD,                   /* FAN 5 Count Low Limit in DataSheet */
};

static const u8 W83791D_REG_PWM[NUMBER_OF_PWM] = {
        0x81,                   /* PWM 1 duty cycle register in DataSheet */
        0x83,                   /* PWM 2 duty cycle register in DataSheet */
        0x94,                   /* PWM 3 duty cycle register in DataSheet */
        0xA0,                   /* PWM 4 duty cycle register in DataSheet */
        0xA1,                   /* PWM 5 duty cycle register in DataSheet */
};

static const u8 W83791D_REG_TEMP_TARGET[3] = {
        0x85,                   /* PWM 1 target temperature for temp 1 */
        0x86,                   /* PWM 2 target temperature for temp 2 */
        0x96,                   /* PWM 3 target temperature for temp 3 */
};

static const u8 W83791D_REG_TEMP_TOL[2] = {
        0x87,                   /* PWM 1/2 temperature tolerance */
        0x97,                   /* PWM 3 temperature tolerance */
};

static const u8 W83791D_REG_FAN_CFG[2] = {
        0x84,                   /* FAN 1/2 configuration */
        0x95,                   /* FAN 3 configuration */
};

static const u8 W83791D_REG_FAN_DIV[3] = {
        0x47,                   /* contains FAN1 and FAN2 Divisor */
        0x4b,                   /* contains FAN3 Divisor */
        0x5C,                   /* contains FAN4 and FAN5 Divisor */
};

#define W83791D_REG_BANK                0x4E
#define W83791D_REG_TEMP2_CONFIG        0xC2
#define W83791D_REG_TEMP3_CONFIG        0xCA

static const u8 W83791D_REG_TEMP1[3] = {
        0x27,                   /* TEMP 1 in DataSheet */
        0x39,                   /* TEMP 1 Over in DataSheet */
        0x3A,                   /* TEMP 1 Hyst in DataSheet */
};

static const u8 W83791D_REG_TEMP_ADD[2][6] = {
        {0xC0,                  /* TEMP 2 in DataSheet */
         0xC1,                  /* TEMP 2(0.5 deg) in DataSheet */
         0xC5,                  /* TEMP 2 Over High part in DataSheet */
         0xC6,                  /* TEMP 2 Over Low part in DataSheet */
         0xC3,                  /* TEMP 2 Thyst High part in DataSheet */
         0xC4},                 /* TEMP 2 Thyst Low part in DataSheet */
        {0xC8,                  /* TEMP 3 in DataSheet */
         0xC9,                  /* TEMP 3(0.5 deg) in DataSheet */
         0xCD,                  /* TEMP 3 Over High part in DataSheet */
         0xCE,                  /* TEMP 3 Over Low part in DataSheet */
         0xCB,                  /* TEMP 3 Thyst High part in DataSheet */
         0xCC}                  /* TEMP 3 Thyst Low part in DataSheet */
};

#define W83791D_REG_BEEP_CONFIG         0x4D

static const u8 W83791D_REG_BEEP_CTRL[3] = {
        0x56,                   /* BEEP Control Register 1 */
        0x57,                   /* BEEP Control Register 2 */
        0xA3,                   /* BEEP Control Register 3 */
};

#define W83791D_REG_GPIO                0x15
#define W83791D_REG_CONFIG              0x40
#define W83791D_REG_VID_FANDIV          0x47
#define W83791D_REG_DID_VID4            0x49
#define W83791D_REG_WCHIPID             0x58
#define W83791D_REG_CHIPMAN             0x4F
#define W83791D_REG_PIN                 0x4B
#define W83791D_REG_I2C_SUBADDR         0x4A

#define W83791D_REG_ALARM1 0xA9 /* realtime status register1 */
#define W83791D_REG_ALARM2 0xAA /* realtime status register2 */
#define W83791D_REG_ALARM3 0xAB /* realtime status register3 */

#define W83791D_REG_VBAT                0x5D
#define W83791D_REG_I2C_ADDR            0x48

/*
 * The SMBus locks itself. The Winbond W83791D has a bank select register
 * (index 0x4e), but the driver only accesses registers in bank 0. Since
 * we don't switch banks, we don't need any special code to handle
 * locking access between bank switches
 */
static inline int w83791d_read(struct i2c_client *client, u8 reg)
{
        return i2c_smbus_read_byte_data(client, reg);
}

static inline int w83791d_write(struct i2c_client *client, u8 reg, u8 value)
{
        return i2c_smbus_write_byte_data(client, reg, value);
}

/*
 * The analog voltage inputs have 16mV LSB. Since the sysfs output is
 * in mV as would be measured on the chip input pin, need to just
 * multiply/divide by 16 to translate from/to register values.
 */
#define IN_TO_REG(val)          (clamp_val((((val) + 8) / 16), 0, 255))
#define IN_FROM_REG(val)        ((val) * 16)

static u8 fan_to_reg(long rpm, int div)
{
        if (rpm == 0)
                return 255;
        rpm = clamp_val(rpm, 1, 1000000);
        return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
}

#define FAN_FROM_REG(val, div)  ((val) == 0 ? -1 : \
                                ((val) == 255 ? 0 : \
                                        1350000 / ((val) * (div))))

/* for temp1 which is 8-bit resolution, LSB = 1 degree Celsius */
#define TEMP1_FROM_REG(val)     ((val) * 1000)
#define TEMP1_TO_REG(val)       ((val) <= -128000 ? -128 : \
                                 (val) >= 127000 ? 127 : \
                                 (val) < 0 ? ((val) - 500) / 1000 : \
                                 ((val) + 500) / 1000)

/*
 * for temp2 and temp3 which are 9-bit resolution, LSB = 0.5 degree Celsius
 * Assumes the top 8 bits are the integral amount and the bottom 8 bits
 * are the fractional amount. Since we only have 0.5 degree resolution,
 * the bottom 7 bits will always be zero
 */
#define TEMP23_FROM_REG(val)    ((val) / 128 * 500)
#define TEMP23_TO_REG(val)      (DIV_ROUND_CLOSEST(clamp_val((val), -128000, \
                                                   127500), 500) * 128)

/* for thermal cruise target temp, 7-bits, LSB = 1 degree Celsius */
#define TARGET_TEMP_TO_REG(val) DIV_ROUND_CLOSEST(clamp_val((val), 0, 127000), \
                                                  1000)

/* for thermal cruise temp tolerance, 4-bits, LSB = 1 degree Celsius */
#define TOL_TEMP_TO_REG(val)    DIV_ROUND_CLOSEST(clamp_val((val), 0, 15000), \
                                                  1000)

#define BEEP_MASK_TO_REG(val)           ((val) & 0xffffff)
#define BEEP_MASK_FROM_REG(val)         ((val) & 0xffffff)

#define DIV_FROM_REG(val)               (1 << (val))

static u8 div_to_reg(int nr, long val)
{
        int i;

        /* fan divisors max out at 128 */
        val = clamp_val(val, 1, 128) >> 1;
        for (i = 0; i < 7; i++) {
                if (val == 0)
                        break;
                val >>= 1;
        }
        return (u8) i;
}

struct w83791d_data {
        struct device *hwmon_dev;
        struct mutex update_lock;

        char valid;                     /* !=0 if following fields are valid */
        unsigned long last_updated;     /* In jiffies */

        /* array of 2 pointers to subclients */
        struct i2c_client *lm75[2];

        /* volts */
        u8 in[NUMBER_OF_VIN];           /* Register value */
        u8 in_max[NUMBER_OF_VIN];       /* Register value */
        u8 in_min[NUMBER_OF_VIN];       /* Register value */

        /* fans */
        u8 fan[NUMBER_OF_FANIN];        /* Register value */
        u8 fan_min[NUMBER_OF_FANIN];    /* Register value */
        u8 fan_div[NUMBER_OF_FANIN];    /* Register encoding, shifted right */

        /* Temperature sensors */

        s8 temp1[3];            /* current, over, thyst */
        s16 temp_add[2][3];     /* fixed point value. Top 8 bits are the
                                 * integral part, bottom 8 bits are the
                                 * fractional part. We only use the top
                                 * 9 bits as the resolution is only
                                 * to the 0.5 degree C...
                                 * two sensors with three values
                                 * (cur, over, hyst)
                                 */

        /* PWMs */
        u8 pwm[5];              /* pwm duty cycle */
        u8 pwm_enable[3];       /* pwm enable status for fan 1-3
                                 * (fan 4-5 only support manual mode)
                                 */

        u8 temp_target[3];      /* pwm 1-3 target temperature */
        u8 temp_tolerance[3];   /* pwm 1-3 temperature tolerance */

        /* Misc */
        u32 alarms;             /* realtime status register encoding,combined */
        u8 beep_enable;         /* Global beep enable */
        u32 beep_mask;          /* Mask off specific beeps */
        u8 vid;                 /* Register encoding, combined */
        u8 vrm;                 /* hwmon-vid */
};

static int w83791d_probe(struct i2c_client *client,
                         const struct i2c_device_id *id);
static int w83791d_detect(struct i2c_client *client,
                          struct i2c_board_info *info);
static int w83791d_remove(struct i2c_client *client);

static int w83791d_read(struct i2c_client *client, u8 reg);
static int w83791d_write(struct i2c_client *client, u8 reg, u8 value);
static struct w83791d_data *w83791d_update_device(struct device *dev);

#ifdef DEBUG
static void w83791d_print_debug(struct w83791d_data *data, struct device *dev);
#endif

static void w83791d_init_client(struct i2c_client *client);

static const struct i2c_device_id w83791d_id[] = {
        { "w83791d", 0 },
        { }
};
MODULE_DEVICE_TABLE(i2c, w83791d_id);

static struct i2c_driver w83791d_driver = {
        .class          = I2C_CLASS_HWMON,
        .driver = {
                .name = "w83791d",
        },
        .probe          = w83791d_probe,
        .remove         = w83791d_remove,
        .id_table       = w83791d_id,
        .detect         = w83791d_detect,
        .address_list   = normal_i2c,
};

/* following are the sysfs callback functions */
#define show_in_reg(reg) \
static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
                        char *buf) \
{ \
        struct sensor_device_attribute *sensor_attr = \
                                                to_sensor_dev_attr(attr); \
        struct w83791d_data *data = w83791d_update_device(dev); \
        int nr = sensor_attr->index; \
        return sprintf(buf, "%d\n", IN_FROM_REG(data->reg[nr])); \
}

show_in_reg(in);
show_in_reg(in_min);
show_in_reg(in_max);

#define store_in_reg(REG, reg) \
static ssize_t store_in_##reg(struct device *dev, \
                                struct device_attribute *attr, \
                                const char *buf, size_t count) \
{ \
        struct sensor_device_attribute *sensor_attr = \
                                                to_sensor_dev_attr(attr); \
        struct i2c_client *client = to_i2c_client(dev); \
        struct w83791d_data *data = i2c_get_clientdata(client); \
        int nr = sensor_attr->index; \
        unsigned long val; \
        int err = kstrtoul(buf, 10, &val); \
        if (err) \
                return err; \
        mutex_lock(&data->update_lock); \
        data->in_##reg[nr] = IN_TO_REG(val); \
        w83791d_write(client, W83791D_REG_IN_##REG[nr], data->in_##reg[nr]); \
        mutex_unlock(&data->update_lock); \
         \
        return count; \
}
store_in_reg(MIN, min);
store_in_reg(MAX, max);

static struct sensor_device_attribute sda_in_input[] = {
        SENSOR_ATTR(in0_input, S_IRUGO, show_in, NULL, 0),
        SENSOR_ATTR(in1_input, S_IRUGO, show_in, NULL, 1),
        SENSOR_ATTR(in2_input, S_IRUGO, show_in, NULL, 2),
        SENSOR_ATTR(in3_input, S_IRUGO, show_in, NULL, 3),
        SENSOR_ATTR(in4_input, S_IRUGO, show_in, NULL, 4),
        SENSOR_ATTR(in5_input, S_IRUGO, show_in, NULL, 5),
        SENSOR_ATTR(in6_input, S_IRUGO, show_in, NULL, 6),
        SENSOR_ATTR(in7_input, S_IRUGO, show_in, NULL, 7),
        SENSOR_ATTR(in8_input, S_IRUGO, show_in, NULL, 8),
        SENSOR_ATTR(in9_input, S_IRUGO, show_in, NULL, 9),
};

static struct sensor_device_attribute sda_in_min[] = {
        SENSOR_ATTR(in0_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 0),
        SENSOR_ATTR(in1_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 1),
        SENSOR_ATTR(in2_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 2),
        SENSOR_ATTR(in3_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 3),
        SENSOR_ATTR(in4_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 4),
        SENSOR_ATTR(in5_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 5),
        SENSOR_ATTR(in6_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 6),
        SENSOR_ATTR(in7_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 7),
        SENSOR_ATTR(in8_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 8),
        SENSOR_ATTR(in9_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 9),
};

static struct sensor_device_attribute sda_in_max[] = {
        SENSOR_ATTR(in0_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 0),
        SENSOR_ATTR(in1_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 1),
        SENSOR_ATTR(in2_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 2),
        SENSOR_ATTR(in3_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 3),
        SENSOR_ATTR(in4_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 4),
        SENSOR_ATTR(in5_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 5),
        SENSOR_ATTR(in6_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 6),
        SENSOR_ATTR(in7_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 7),
        SENSOR_ATTR(in8_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 8),
        SENSOR_ATTR(in9_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 9),
};


static ssize_t show_beep(struct device *dev, struct device_attribute *attr,
                        char *buf)
{
        struct sensor_device_attribute *sensor_attr =
                                                to_sensor_dev_attr(attr);
        struct w83791d_data *data = w83791d_update_device(dev);
        int bitnr = sensor_attr->index;

        return sprintf(buf, "%d\n", (data->beep_mask >> bitnr) & 1);
}

static ssize_t store_beep(struct device *dev, struct device_attribute *attr,
                        const char *buf, size_t count)
{
        struct sensor_device_attribute *sensor_attr =
                                                to_sensor_dev_attr(attr);
        struct i2c_client *client = to_i2c_client(dev);
        struct w83791d_data *data = i2c_get_clientdata(client);
        int bitnr = sensor_attr->index;
        int bytenr = bitnr / 8;
        unsigned long val;
        int err;

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

        val = val ? 1 : 0;

        mutex_lock(&data->update_lock);

        data->beep_mask &= ~(0xff << (bytenr * 8));
        data->beep_mask |= w83791d_read(client, W83791D_REG_BEEP_CTRL[bytenr])
                << (bytenr * 8);

        data->beep_mask &= ~(1 << bitnr);
        data->beep_mask |= val << bitnr;

        w83791d_write(client, W83791D_REG_BEEP_CTRL[bytenr],
                (data->beep_mask >> (bytenr * 8)) & 0xff);

        mutex_unlock(&data->update_lock);

        return count;
}

static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
                        char *buf)
{
        struct sensor_device_attribute *sensor_attr =
                                                to_sensor_dev_attr(attr);
        struct w83791d_data *data = w83791d_update_device(dev);
        int bitnr = sensor_attr->index;

        return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
}

/*
 * Note: The bitmask for the beep enable/disable is different than
 * the bitmask for the alarm.
 */
static struct sensor_device_attribute sda_in_beep[] = {
        SENSOR_ATTR(in0_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 0),
        SENSOR_ATTR(in1_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 13),
        SENSOR_ATTR(in2_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 2),
        SENSOR_ATTR(in3_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 3),
        SENSOR_ATTR(in4_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 8),
        SENSOR_ATTR(in5_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 9),
        SENSOR_ATTR(in6_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 10),
        SENSOR_ATTR(in7_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 16),
        SENSOR_ATTR(in8_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 17),
        SENSOR_ATTR(in9_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 14),
};

static struct sensor_device_attribute sda_in_alarm[] = {
        SENSOR_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0),
        SENSOR_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1),
        SENSOR_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2),
        SENSOR_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3),
        SENSOR_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8),
        SENSOR_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9),
        SENSOR_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 10),
        SENSOR_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 19),
        SENSOR_ATTR(in8_alarm, S_IRUGO, show_alarm, NULL, 20),
        SENSOR_ATTR(in9_alarm, S_IRUGO, show_alarm, NULL, 14),
};

#define show_fan_reg(reg) \
static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
                                char *buf) \
{ \
        struct sensor_device_attribute *sensor_attr = \
                                                to_sensor_dev_attr(attr); \
        struct w83791d_data *data = w83791d_update_device(dev); \
        int nr = sensor_attr->index; \
        return sprintf(buf, "%d\n", \
                FAN_FROM_REG(data->reg[nr], DIV_FROM_REG(data->fan_div[nr]))); \
}

show_fan_reg(fan);
show_fan_reg(fan_min);

static ssize_t store_fan_min(struct device *dev, struct device_attribute *attr,
                                const char *buf, size_t count)
{
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        struct i2c_client *client = to_i2c_client(dev);
        struct w83791d_data *data = i2c_get_clientdata(client);
        int nr = sensor_attr->index;
        unsigned long val;
        int err;

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

        mutex_lock(&data->update_lock);
        data->fan_min[nr] = fan_to_reg(val, DIV_FROM_REG(data->fan_div[nr]));
        w83791d_write(client, W83791D_REG_FAN_MIN[nr], data->fan_min[nr]);
        mutex_unlock(&data->update_lock);

        return count;
}

static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
                                char *buf)
{
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        int nr = sensor_attr->index;
        struct w83791d_data *data = w83791d_update_device(dev);
        return sprintf(buf, "%u\n", DIV_FROM_REG(data->fan_div[nr]));
}

/*
 * Note: we save and restore the fan minimum here, because its value is
 * determined in part by the fan divisor.  This follows the principle of
 * least surprise; the user doesn't expect the fan minimum to change just
 * because the divisor changed.
 */
static ssize_t store_fan_div(struct device *dev, struct device_attribute *attr,
                                const char *buf, size_t count)
{
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        struct i2c_client *client = to_i2c_client(dev);
        struct w83791d_data *data = i2c_get_clientdata(client);
        int nr = sensor_attr->index;
        unsigned long min;
        u8 tmp_fan_div;
        u8 fan_div_reg;
        u8 vbat_reg;
        int indx = 0;
        u8 keep_mask = 0;
        u8 new_shift = 0;
        unsigned long val;
        int err;

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

        /* Save fan_min */
        min = FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr]));

        mutex_lock(&data->update_lock);
        data->fan_div[nr] = div_to_reg(nr, val);

        switch (nr) {
        case 0:
                indx = 0;
                keep_mask = 0xcf;
                new_shift = 4;
                break;
        case 1:
                indx = 0;
                keep_mask = 0x3f;
                new_shift = 6;
                break;
        case 2:
                indx = 1;
                keep_mask = 0x3f;
                new_shift = 6;
                break;
        case 3:
                indx = 2;
                keep_mask = 0xf8;
                new_shift = 0;
                break;
        case 4:
                indx = 2;
                keep_mask = 0x8f;
                new_shift = 4;
                break;
#ifdef DEBUG
        default:
                dev_warn(dev, "store_fan_div: Unexpected nr seen: %d\n", nr);
                count = -EINVAL;
                goto err_exit;
#endif
        }

        fan_div_reg = w83791d_read(client, W83791D_REG_FAN_DIV[indx])
                        & keep_mask;
        tmp_fan_div = (data->fan_div[nr] << new_shift) & ~keep_mask;

        w83791d_write(client, W83791D_REG_FAN_DIV[indx],
                                fan_div_reg | tmp_fan_div);

        /* Bit 2 of fans 0-2 is stored in the vbat register (bits 5-7) */
        if (nr < 3) {
                keep_mask = ~(1 << (nr + 5));
                vbat_reg = w83791d_read(client, W83791D_REG_VBAT)
                                & keep_mask;
                tmp_fan_div = (data->fan_div[nr] << (3 + nr)) & ~keep_mask;
                w83791d_write(client, W83791D_REG_VBAT,
                                vbat_reg | tmp_fan_div);
        }

        /* Restore fan_min */
        data->fan_min[nr] = fan_to_reg(min, DIV_FROM_REG(data->fan_div[nr]));
        w83791d_write(client, W83791D_REG_FAN_MIN[nr], data->fan_min[nr]);

#ifdef DEBUG
err_exit:
#endif
        mutex_unlock(&data->update_lock);

        return count;
}

static struct sensor_device_attribute sda_fan_input[] = {
        SENSOR_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0),
        SENSOR_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1),
        SENSOR_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2),
        SENSOR_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3),
        SENSOR_ATTR(fan5_input, S_IRUGO, show_fan, NULL, 4),
};

static struct sensor_device_attribute sda_fan_min[] = {
        SENSOR_ATTR(fan1_min, S_IWUSR | S_IRUGO,
                        show_fan_min, store_fan_min, 0),
        SENSOR_ATTR(fan2_min, S_IWUSR | S_IRUGO,
                        show_fan_min, store_fan_min, 1),
        SENSOR_ATTR(fan3_min, S_IWUSR | S_IRUGO,
                        show_fan_min, store_fan_min, 2),
        SENSOR_ATTR(fan4_min, S_IWUSR | S_IRUGO,
                        show_fan_min, store_fan_min, 3),
        SENSOR_ATTR(fan5_min, S_IWUSR | S_IRUGO,
                        show_fan_min, store_fan_min, 4),
};

static struct sensor_device_attribute sda_fan_div[] = {
        SENSOR_ATTR(fan1_div, S_IWUSR | S_IRUGO,
                        show_fan_div, store_fan_div, 0),
        SENSOR_ATTR(fan2_div, S_IWUSR | S_IRUGO,
                        show_fan_div, store_fan_div, 1),
        SENSOR_ATTR(fan3_div, S_IWUSR | S_IRUGO,
                        show_fan_div, store_fan_div, 2),
        SENSOR_ATTR(fan4_div, S_IWUSR | S_IRUGO,
                        show_fan_div, store_fan_div, 3),
        SENSOR_ATTR(fan5_div, S_IWUSR | S_IRUGO,
                        show_fan_div, store_fan_div, 4),
};

static struct sensor_device_attribute sda_fan_beep[] = {
        SENSOR_ATTR(fan1_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 6),
        SENSOR_ATTR(fan2_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 7),
        SENSOR_ATTR(fan3_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 11),
        SENSOR_ATTR(fan4_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 21),
        SENSOR_ATTR(fan5_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 22),
};

static struct sensor_device_attribute sda_fan_alarm[] = {
        SENSOR_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6),
        SENSOR_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7),
        SENSOR_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 11),
        SENSOR_ATTR(fan4_alarm, S_IRUGO, show_alarm, NULL, 21),
        SENSOR_ATTR(fan5_alarm, S_IRUGO, show_alarm, NULL, 22),
};

/* read/write PWMs */
static ssize_t show_pwm(struct device *dev, struct device_attribute *attr,
                                char *buf)
{
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        int nr = sensor_attr->index;
        struct w83791d_data *data = w83791d_update_device(dev);
        return sprintf(buf, "%u\n", data->pwm[nr]);
}

static ssize_t store_pwm(struct device *dev, struct device_attribute *attr,
                const char *buf, size_t count)
{
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        struct i2c_client *client = to_i2c_client(dev);
        struct w83791d_data *data = i2c_get_clientdata(client);
        int nr = sensor_attr->index;
        unsigned long val;

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

        mutex_lock(&data->update_lock);
        data->pwm[nr] = clamp_val(val, 0, 255);
        w83791d_write(client, W83791D_REG_PWM[nr], data->pwm[nr]);
        mutex_unlock(&data->update_lock);
        return count;
}

static struct sensor_device_attribute sda_pwm[] = {
        SENSOR_ATTR(pwm1, S_IWUSR | S_IRUGO,
                        show_pwm, store_pwm, 0),
        SENSOR_ATTR(pwm2, S_IWUSR | S_IRUGO,
                        show_pwm, store_pwm, 1),
        SENSOR_ATTR(pwm3, S_IWUSR | S_IRUGO,
                        show_pwm, store_pwm, 2),
        SENSOR_ATTR(pwm4, S_IWUSR | S_IRUGO,
                        show_pwm, store_pwm, 3),
        SENSOR_ATTR(pwm5, S_IWUSR | S_IRUGO,
                        show_pwm, store_pwm, 4),
};

static ssize_t show_pwmenable(struct device *dev, struct device_attribute *attr,
                                char *buf)
{
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        int nr = sensor_attr->index;
        struct w83791d_data *data = w83791d_update_device(dev);
        return sprintf(buf, "%u\n", data->pwm_enable[nr] + 1);
}

static ssize_t store_pwmenable(struct device *dev,
                struct device_attribute *attr, const char *buf, size_t count)
{
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        struct i2c_client *client = to_i2c_client(dev);
        struct w83791d_data *data = i2c_get_clientdata(client);
        int nr = sensor_attr->index;
        unsigned long val;
        u8 reg_cfg_tmp;
        u8 reg_idx = 0;
        u8 val_shift = 0;
        u8 keep_mask = 0;

        int ret = kstrtoul(buf, 10, &val);

        if (ret || val < 1 || val > 3)
                return -EINVAL;

        mutex_lock(&data->update_lock);
        data->pwm_enable[nr] = val - 1;
        switch (nr) {
        case 0:
                reg_idx = 0;
                val_shift = 2;
                keep_mask = 0xf3;
                break;
        case 1:
                reg_idx = 0;
                val_shift = 4;
                keep_mask = 0xcf;
                break;
        case 2:
                reg_idx = 1;
                val_shift = 2;
                keep_mask = 0xf3;
                break;
        }

        reg_cfg_tmp = w83791d_read(client, W83791D_REG_FAN_CFG[reg_idx]);
        reg_cfg_tmp = (reg_cfg_tmp & keep_mask) |
                                        data->pwm_enable[nr] << val_shift;

        w83791d_write(client, W83791D_REG_FAN_CFG[reg_idx], reg_cfg_tmp);
        mutex_unlock(&data->update_lock);

        return count;
}
static struct sensor_device_attribute sda_pwmenable[] = {
        SENSOR_ATTR(pwm1_enable, S_IWUSR | S_IRUGO,
                        show_pwmenable, store_pwmenable, 0),
        SENSOR_ATTR(pwm2_enable, S_IWUSR | S_IRUGO,
                        show_pwmenable, store_pwmenable, 1),
        SENSOR_ATTR(pwm3_enable, S_IWUSR | S_IRUGO,
                        show_pwmenable, store_pwmenable, 2),
};

/* For Smart Fan I / Thermal Cruise */
static ssize_t show_temp_target(struct device *dev,
                        struct device_attribute *attr, char *buf)
{
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        struct w83791d_data *data = w83791d_update_device(dev);
        int nr = sensor_attr->index;
        return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->temp_target[nr]));
}

static ssize_t store_temp_target(struct device *dev,
                struct device_attribute *attr, const char *buf, size_t count)
{
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        struct i2c_client *client = to_i2c_client(dev);
        struct w83791d_data *data = i2c_get_clientdata(client);
        int nr = sensor_attr->index;
        long val;
        u8 target_mask;

        if (kstrtol(buf, 10, &val))
                return -EINVAL;

        mutex_lock(&data->update_lock);
        data->temp_target[nr] = TARGET_TEMP_TO_REG(val);
        target_mask = w83791d_read(client,
                                W83791D_REG_TEMP_TARGET[nr]) & 0x80;
        w83791d_write(client, W83791D_REG_TEMP_TARGET[nr],
                                data->temp_target[nr] | target_mask);
        mutex_unlock(&data->update_lock);
        return count;
}

static struct sensor_device_attribute sda_temp_target[] = {
        SENSOR_ATTR(temp1_target, S_IWUSR | S_IRUGO,
                        show_temp_target, store_temp_target, 0),
        SENSOR_ATTR(temp2_target, S_IWUSR | S_IRUGO,
                        show_temp_target, store_temp_target, 1),
        SENSOR_ATTR(temp3_target, S_IWUSR | S_IRUGO,
                        show_temp_target, store_temp_target, 2),
};

static ssize_t show_temp_tolerance(struct device *dev,
                        struct device_attribute *attr, char *buf)
{
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        struct w83791d_data *data = w83791d_update_device(dev);
        int nr = sensor_attr->index;
        return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->temp_tolerance[nr]));
}

static ssize_t store_temp_tolerance(struct device *dev,
                struct device_attribute *attr, const char *buf, size_t count)
{
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        struct i2c_client *client = to_i2c_client(dev);
        struct w83791d_data *data = i2c_get_clientdata(client);
        int nr = sensor_attr->index;
        unsigned long val;
        u8 target_mask;
        u8 reg_idx = 0;
        u8 val_shift = 0;
        u8 keep_mask = 0;

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

        switch (nr) {
        case 0:
                reg_idx = 0;
                val_shift = 0;
                keep_mask = 0xf0;
                break;
        case 1:
                reg_idx = 0;
                val_shift = 4;
                keep_mask = 0x0f;
                break;
        case 2:
                reg_idx = 1;
                val_shift = 0;
                keep_mask = 0xf0;
                break;
        }

        mutex_lock(&data->update_lock);
        data->temp_tolerance[nr] = TOL_TEMP_TO_REG(val);
        target_mask = w83791d_read(client,
                        W83791D_REG_TEMP_TOL[reg_idx]) & keep_mask;
        w83791d_write(client, W83791D_REG_TEMP_TOL[reg_idx],
                        (data->temp_tolerance[nr] << val_shift) | target_mask);
        mutex_unlock(&data->update_lock);
        return count;
}

static struct sensor_device_attribute sda_temp_tolerance[] = {
        SENSOR_ATTR(temp1_tolerance, S_IWUSR | S_IRUGO,
                        show_temp_tolerance, store_temp_tolerance, 0),
        SENSOR_ATTR(temp2_tolerance, S_IWUSR | S_IRUGO,
                        show_temp_tolerance, store_temp_tolerance, 1),
        SENSOR_ATTR(temp3_tolerance, S_IWUSR | S_IRUGO,
                        show_temp_tolerance, store_temp_tolerance, 2),
};

/* read/write the temperature1, includes measured value and limits */
static ssize_t show_temp1(struct device *dev, struct device_attribute *devattr,
                                char *buf)
{
        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
        struct w83791d_data *data = w83791d_update_device(dev);
        return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->temp1[attr->index]));
}

static ssize_t store_temp1(struct device *dev, struct device_attribute *devattr,
                                const char *buf, size_t count)
{
        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
        struct i2c_client *client = to_i2c_client(dev);
        struct w83791d_data *data = i2c_get_clientdata(client);
        int nr = attr->index;
        long val;
        int err;

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

        mutex_lock(&data->update_lock);
        data->temp1[nr] = TEMP1_TO_REG(val);
        w83791d_write(client, W83791D_REG_TEMP1[nr], data->temp1[nr]);
        mutex_unlock(&data->update_lock);
        return count;
}

/* read/write temperature2-3, includes measured value and limits */
static ssize_t show_temp23(struct device *dev, struct device_attribute *devattr,
                                char *buf)
{
        struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
        struct w83791d_data *data = w83791d_update_device(dev);
        int nr = attr->nr;
        int index = attr->index;
        return sprintf(buf, "%d\n", TEMP23_FROM_REG(data->temp_add[nr][index]));
}

static ssize_t store_temp23(struct device *dev,
                                struct device_attribute *devattr,
                                const char *buf, size_t count)
{
        struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
        struct i2c_client *client = to_i2c_client(dev);
        struct w83791d_data *data = i2c_get_clientdata(client);
        long val;
        int err;
        int nr = attr->nr;
        int index = attr->index;

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

        mutex_lock(&data->update_lock);
        data->temp_add[nr][index] = TEMP23_TO_REG(val);
        w83791d_write(client, W83791D_REG_TEMP_ADD[nr][index * 2],
                                data->temp_add[nr][index] >> 8);
        w83791d_write(client, W83791D_REG_TEMP_ADD[nr][index * 2 + 1],
                                data->temp_add[nr][index] & 0x80);
        mutex_unlock(&data->update_lock);

        return count;
}

static struct sensor_device_attribute_2 sda_temp_input[] = {
        SENSOR_ATTR_2(temp1_input, S_IRUGO, show_temp1, NULL, 0, 0),
        SENSOR_ATTR_2(temp2_input, S_IRUGO, show_temp23, NULL, 0, 0),
        SENSOR_ATTR_2(temp3_input, S_IRUGO, show_temp23, NULL, 1, 0),
};

static struct sensor_device_attribute_2 sda_temp_max[] = {
        SENSOR_ATTR_2(temp1_max, S_IRUGO | S_IWUSR,
                        show_temp1, store_temp1, 0, 1),
        SENSOR_ATTR_2(temp2_max, S_IRUGO | S_IWUSR,
                        show_temp23, store_temp23, 0, 1),

        SENSOR_ATTR_2(temp3_max, S_IRUGO | S_IWUSR,
                        show_temp23, store_temp23, 1, 1),
};

static struct sensor_device_attribute_2 sda_temp_max_hyst[] = {
        SENSOR_ATTR_2(temp1_max_hyst, S_IRUGO | S_IWUSR,
                        show_temp1, store_temp1, 0, 2),
        SENSOR_ATTR_2(temp2_max_hyst, S_IRUGO | S_IWUSR,
                        show_temp23, store_temp23, 0, 2),
        SENSOR_ATTR_2(temp3_max_hyst, S_IRUGO | S_IWUSR,
                        show_temp23, store_temp23, 1, 2),
};

/*
 * Note: The bitmask for the beep enable/disable is different than
 * the bitmask for the alarm.
 */
static struct sensor_device_attribute sda_temp_beep[] = {
        SENSOR_ATTR(temp1_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 4),
        SENSOR_ATTR(temp2_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 5),
        SENSOR_ATTR(temp3_beep, S_IWUSR | S_IRUGO, show_beep, store_beep, 1),
};

static struct sensor_device_attribute sda_temp_alarm[] = {
        SENSOR_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4),
        SENSOR_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5),
        SENSOR_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 13),
};

/* get realtime status of all sensors items: voltage, temp, fan */
static ssize_t alarms_show(struct device *dev, struct device_attribute *attr,
                           char *buf)
{
        struct w83791d_data *data = w83791d_update_device(dev);
        return sprintf(buf, "%u\n", data->alarms);
}

static DEVICE_ATTR_RO(alarms);

/* Beep control */

#define GLOBAL_BEEP_ENABLE_SHIFT        15
#define GLOBAL_BEEP_ENABLE_MASK         (1 << GLOBAL_BEEP_ENABLE_SHIFT)

static ssize_t show_beep_enable(struct device *dev,
                                struct device_attribute *attr, char *buf)
{
        struct w83791d_data *data = w83791d_update_device(dev);
        return sprintf(buf, "%d\n", data->beep_enable);
}

static ssize_t show_beep_mask(struct device *dev,
                                struct device_attribute *attr, char *buf)
{
        struct w83791d_data *data = w83791d_update_device(dev);
        return sprintf(buf, "%d\n", BEEP_MASK_FROM_REG(data->beep_mask));
}


static ssize_t store_beep_mask(struct device *dev,
                                struct device_attribute *attr,
                                const char *buf, size_t count)
{
        struct i2c_client *client = to_i2c_client(dev);
        struct w83791d_data *data = i2c_get_clientdata(client);
        int i;
        long val;
        int err;

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

        mutex_lock(&data->update_lock);

        /*
         * The beep_enable state overrides any enabling request from
         * the masks
         */
        data->beep_mask = BEEP_MASK_TO_REG(val) & ~GLOBAL_BEEP_ENABLE_MASK;
        data->beep_mask |= (data->beep_enable << GLOBAL_BEEP_ENABLE_SHIFT);

        val = data->beep_mask;

        for (i = 0; i < 3; i++) {
                w83791d_write(client, W83791D_REG_BEEP_CTRL[i], (val & 0xff));
                val >>= 8;
        }

        mutex_unlock(&data->update_lock);

        return count;
}

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 w83791d_data *data = i2c_get_clientdata(client);
        long val;
        int err;

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

        mutex_lock(&data->update_lock);

        data->beep_enable = val ? 1 : 0;

        /* Keep the full mask value in sync with the current enable */
        data->beep_mask &= ~GLOBAL_BEEP_ENABLE_MASK;
        data->beep_mask |= (data->beep_enable << GLOBAL_BEEP_ENABLE_SHIFT);

        /*
         * The global control is in the second beep control register
         * so only need to update that register
         */
        val = (data->beep_mask >> 8) & 0xff;

        w83791d_write(client, W83791D_REG_BEEP_CTRL[1], val);

        mutex_unlock(&data->update_lock);

        return count;
}

static struct sensor_device_attribute sda_beep_ctrl[] = {
        SENSOR_ATTR(beep_enable, S_IRUGO | S_IWUSR,
                        show_beep_enable, store_beep_enable, 0),
        SENSOR_ATTR(beep_mask, S_IRUGO | S_IWUSR,
                        show_beep_mask, store_beep_mask, 1)
};

/* cpu voltage regulation information */
static ssize_t cpu0_vid_show(struct device *dev,
                             struct device_attribute *attr, char *buf)
{
        struct w83791d_data *data = w83791d_update_device(dev);
        return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
}

static DEVICE_ATTR_RO(cpu0_vid);

static ssize_t vrm_show(struct device *dev, struct device_attribute *attr,
                        char *buf)
{
        struct w83791d_data *data = dev_get_drvdata(dev);
        return sprintf(buf, "%d\n", data->vrm);
}

static ssize_t vrm_store(struct device *dev, struct device_attribute *attr,
                         const char *buf, size_t count)
{
        struct w83791d_data *data = dev_get_drvdata(dev);
        unsigned long val;
        int err;

        /*
         * No lock needed as vrm is internal to the driver
         * (not read from a chip register) and so is not
         * updated in w83791d_update_device()
         */

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

        if (val > 255)
                return -EINVAL;

        data->vrm = val;
        return count;
}

static DEVICE_ATTR_RW(vrm);

#define IN_UNIT_ATTRS(X) \
        &sda_in_input[X].dev_attr.attr, \
        &sda_in_min[X].dev_attr.attr,   \
        &sda_in_max[X].dev_attr.attr,   \
        &sda_in_beep[X].dev_attr.attr,  \
        &sda_in_alarm[X].dev_attr.attr

#define FAN_UNIT_ATTRS(X) \
        &sda_fan_input[X].dev_attr.attr,        \
        &sda_fan_min[X].dev_attr.attr,          \
        &sda_fan_div[X].dev_attr.attr,          \
        &sda_fan_beep[X].dev_attr.attr,         \
        &sda_fan_alarm[X].dev_attr.attr

#define TEMP_UNIT_ATTRS(X) \
        &sda_temp_input[X].dev_attr.attr,       \
        &sda_temp_max[X].dev_attr.attr,         \
        &sda_temp_max_hyst[X].dev_attr.attr,    \
        &sda_temp_beep[X].dev_attr.attr,        \
        &sda_temp_alarm[X].dev_attr.attr

static struct attribute *w83791d_attributes[] = {
        IN_UNIT_ATTRS(0),
        IN_UNIT_ATTRS(1),
        IN_UNIT_ATTRS(2),
        IN_UNIT_ATTRS(3),
        IN_UNIT_ATTRS(4),
        IN_UNIT_ATTRS(5),
        IN_UNIT_ATTRS(6),
        IN_UNIT_ATTRS(7),
        IN_UNIT_ATTRS(8),
        IN_UNIT_ATTRS(9),
        FAN_UNIT_ATTRS(0),
        FAN_UNIT_ATTRS(1),
        FAN_UNIT_ATTRS(2),
        TEMP_UNIT_ATTRS(0),
        TEMP_UNIT_ATTRS(1),
        TEMP_UNIT_ATTRS(2),
        &dev_attr_alarms.attr,
        &sda_beep_ctrl[0].dev_attr.attr,
        &sda_beep_ctrl[1].dev_attr.attr,
        &dev_attr_cpu0_vid.attr,
        &dev_attr_vrm.attr,
        &sda_pwm[0].dev_attr.attr,
        &sda_pwm[1].dev_attr.attr,
        &sda_pwm[2].dev_attr.attr,
        &sda_pwmenable[0].dev_attr.attr,
        &sda_pwmenable[1].dev_attr.attr,
        &sda_pwmenable[2].dev_attr.attr,
        &sda_temp_target[0].dev_attr.attr,
        &sda_temp_target[1].dev_attr.attr,
        &sda_temp_target[2].dev_attr.attr,
        &sda_temp_tolerance[0].dev_attr.attr,
        &sda_temp_tolerance[1].dev_attr.attr,
        &sda_temp_tolerance[2].dev_attr.attr,
        NULL
};

static const struct attribute_group w83791d_group = {
        .attrs = w83791d_attributes,
};

/*
 * Separate group of attributes for fan/pwm 4-5. Their pins can also be
 * in use for GPIO in which case their sysfs-interface should not be made
 * available
 */
static struct attribute *w83791d_attributes_fanpwm45[] = {
        FAN_UNIT_ATTRS(3),
        FAN_UNIT_ATTRS(4),
        &sda_pwm[3].dev_attr.attr,
        &sda_pwm[4].dev_attr.attr,
        NULL
};

static const struct attribute_group w83791d_group_fanpwm45 = {
        .attrs = w83791d_attributes_fanpwm45,
};

static int w83791d_detect_subclients(struct i2c_client *client)
{
        struct i2c_adapter *adapter = client->adapter;
        struct w83791d_data *data = i2c_get_clientdata(client);
        int address = client->addr;
        int i, id, err;
        u8 val;

        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 = -ENODEV;
                                goto error_sc_0;
                        }
                }
                w83791d_write(client, W83791D_REG_I2C_SUBADDR,
                                        (force_subclients[2] & 0x07) |
                                        ((force_subclients[3] & 0x07) << 4));
        }

        val = w83791d_read(client, W83791D_REG_I2C_SUBADDR);
        if (!(val & 0x08))
                data->lm75[0] = i2c_new_dummy(adapter, 0x48 + (val & 0x7));
        if (!(val & 0x80)) {
                if ((data->lm75[0] != NULL) &&
                                ((val & 0x7) == ((val >> 4) & 0x7))) {
                        dev_err(&client->dev,
                                "duplicate addresses 0x%x, "
                                "use force_subclient\n",
                                data->lm75[0]->addr);
                        err = -ENODEV;
                        goto error_sc_1;
                }
                data->lm75[1] = i2c_new_dummy(adapter,
                                              0x48 + ((val >> 4) & 0x7));
        }

        return 0;

/* Undo inits in case of errors */

error_sc_1:
        i2c_unregister_device(data->lm75[0]);
error_sc_0:
        return err;
}


/* Return 0 if detection is successful, -ENODEV otherwise */
static int w83791d_detect(struct i2c_client *client,
                          struct i2c_board_info *info)
{
        struct i2c_adapter *adapter = client->adapter;
        int val1, val2;
        unsigned short address = client->addr;

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

        if (w83791d_read(client, W83791D_REG_CONFIG) & 0x80)
                return -ENODEV;

        val1 = w83791d_read(client, W83791D_REG_BANK);
        val2 = w83791d_read(client, W83791D_REG_CHIPMAN);
        /* Check for Winbond ID if in bank 0 */
        if (!(val1 & 0x07)) {
                if ((!(val1 & 0x80) && val2 != 0xa3) ||
                    ((val1 & 0x80) && val2 != 0x5c)) {
                        return -ENODEV;
                }
        }
        /*
         * If Winbond chip, address of chip and W83791D_REG_I2C_ADDR
         * should match
         */
        if (w83791d_read(client, W83791D_REG_I2C_ADDR) != address)
                return -ENODEV;

        /* We want bank 0 and Vendor ID high byte */
        val1 = w83791d_read(client, W83791D_REG_BANK) & 0x78;
        w83791d_write(client, W83791D_REG_BANK, val1 | 0x80);

        /* Verify it is a Winbond w83791d */
        val1 = w83791d_read(client, W83791D_REG_WCHIPID);
        val2 = w83791d_read(client, W83791D_REG_CHIPMAN);
        if (val1 != 0x71 || val2 != 0x5c)
                return -ENODEV;

        strlcpy(info->type, "w83791d", I2C_NAME_SIZE);

        return 0;
}

static int w83791d_probe(struct i2c_client *client,
                         const struct i2c_device_id *id)
{
        struct w83791d_data *data;
        struct device *dev = &client->dev;
        int i, err;
        u8 has_fanpwm45;

#ifdef DEBUG
        int val1;
        val1 = w83791d_read(client, W83791D_REG_DID_VID4);
        dev_dbg(dev, "Device ID version: %d.%d (0x%02x)\n",
                        (val1 >> 5) & 0x07, (val1 >> 1) & 0x0f, val1);
#endif

        data = devm_kzalloc(&client->dev, sizeof(struct w83791d_data),
                            GFP_KERNEL);
        if (!data)
                return -ENOMEM;

        i2c_set_clientdata(client, data);
        mutex_init(&data->update_lock);

        err = w83791d_detect_subclients(client);
        if (err)
                return err;

        /* Initialize the chip */
        w83791d_init_client(client);

        /*
         * If the fan_div is changed, make sure there is a rational
         * fan_min in place
         */
        for (i = 0; i < NUMBER_OF_FANIN; i++)
                data->fan_min[i] = w83791d_read(client, W83791D_REG_FAN_MIN[i]);

        /* Register sysfs hooks */
        err = sysfs_create_group(&client->dev.kobj, &w83791d_group);
        if (err)
                goto error3;

        /* Check if pins of fan/pwm 4-5 are in use as GPIO */
        has_fanpwm45 = w83791d_read(client, W83791D_REG_GPIO) & 0x10;
        if (has_fanpwm45) {
                err = sysfs_create_group(&client->dev.kobj,
                                         &w83791d_group_fanpwm45);
                if (err)
                        goto error4;
        }

        /* Everything is ready, now register the working device */
        data->hwmon_dev = hwmon_device_register(dev);
        if (IS_ERR(data->hwmon_dev)) {
                err = PTR_ERR(data->hwmon_dev);
                goto error5;
        }

        return 0;

error5:
        if (has_fanpwm45)
                sysfs_remove_group(&client->dev.kobj, &w83791d_group_fanpwm45);
error4:
        sysfs_remove_group(&client->dev.kobj, &w83791d_group);
error3:
        i2c_unregister_device(data->lm75[0]);
        i2c_unregister_device(data->lm75[1]);
        return err;
}

static int w83791d_remove(struct i2c_client *client)
{
        struct w83791d_data *data = i2c_get_clientdata(client);

        hwmon_device_unregister(data->hwmon_dev);
        sysfs_remove_group(&client->dev.kobj, &w83791d_group);

        i2c_unregister_device(data->lm75[0]);
        i2c_unregister_device(data->lm75[1]);

        return 0;
}

static void w83791d_init_client(struct i2c_client *client)
{
        struct w83791d_data *data = i2c_get_clientdata(client);
        u8 tmp;
        u8 old_beep;

        /*
         * The difference between reset and init is that reset
         * does a hard reset of the chip via index 0x40, bit 7,
         * but init simply forces certain registers to have "sane"
         * values. The hope is that the BIOS has done the right
         * thing (which is why the default is reset=0, init=0),
         * but if not, reset is the hard hammer and init
         * is the soft mallet both of which are trying to whack
         * things into place...
         * NOTE: The data sheet makes a distinction between
         * "power on defaults" and "reset by MR". As far as I can tell,
         * the hard reset puts everything into a power-on state so I'm
         * not sure what "reset by MR" means or how it can happen.
         */
        if (reset || init) {
                /* keep some BIOS settings when we... */
                old_beep = w83791d_read(client, W83791D_REG_BEEP_CONFIG);

                if (reset) {
                        /* ... reset the chip and ... */
                        w83791d_write(client, W83791D_REG_CONFIG, 0x80);
                }

                /* ... disable power-on abnormal beep */
                w83791d_write(client, W83791D_REG_BEEP_CONFIG, old_beep | 0x80);

                /* disable the global beep (not done by hard reset) */
                tmp = w83791d_read(client, W83791D_REG_BEEP_CTRL[1]);
                w83791d_write(client, W83791D_REG_BEEP_CTRL[1], tmp & 0xef);

                if (init) {
                        /* Make sure monitoring is turned on for add-ons */
                        tmp = w83791d_read(client, W83791D_REG_TEMP2_CONFIG);
                        if (tmp & 1) {
                                w83791d_write(client, W83791D_REG_TEMP2_CONFIG,
                                        tmp & 0xfe);
                        }

                        tmp = w83791d_read(client, W83791D_REG_TEMP3_CONFIG);
                        if (tmp & 1) {
                                w83791d_write(client, W83791D_REG_TEMP3_CONFIG,
                                        tmp & 0xfe);
                        }

                        /* Start monitoring */
                        tmp = w83791d_read(client, W83791D_REG_CONFIG) & 0xf7;
                        w83791d_write(client, W83791D_REG_CONFIG, tmp | 0x01);
                }
        }

        data->vrm = vid_which_vrm();
}

static struct w83791d_data *w83791d_update_device(struct device *dev)
{
        struct i2c_client *client = to_i2c_client(dev);
        struct w83791d_data *data = i2c_get_clientdata(client);
        int i, j;
        u8 reg_array_tmp[3];
        u8 vbat_reg;

        mutex_lock(&data->update_lock);

        if (time_after(jiffies, data->last_updated + (HZ * 3))
                        || !data->valid) {
                dev_dbg(dev, "Starting w83791d device update\n");

                /* Update the voltages measured value and limits */
                for (i = 0; i < NUMBER_OF_VIN; i++) {
                        data->in[i] = w83791d_read(client,
                                                W83791D_REG_IN[i]);
                        data->in_max[i] = w83791d_read(client,
                                                W83791D_REG_IN_MAX[i]);
                        data->in_min[i] = w83791d_read(client,
                                                W83791D_REG_IN_MIN[i]);
                }

                /* Update the fan counts and limits */
                for (i = 0; i < NUMBER_OF_FANIN; i++) {
                        /* Update the Fan measured value and limits */
                        data->fan[i] = w83791d_read(client,
                                                W83791D_REG_FAN[i]);
                        data->fan_min[i] = w83791d_read(client,
                                                W83791D_REG_FAN_MIN[i]);
                }

                /* Update the fan divisor */
                for (i = 0; i < 3; i++) {
                        reg_array_tmp[i] = w83791d_read(client,
                                                W83791D_REG_FAN_DIV[i]);
                }
                data->fan_div[0] = (reg_array_tmp[0] >> 4) & 0x03;
                data->fan_div[1] = (reg_array_tmp[0] >> 6) & 0x03;
                data->fan_div[2] = (reg_array_tmp[1] >> 6) & 0x03;
                data->fan_div[3] = reg_array_tmp[2] & 0x07;
                data->fan_div[4] = (reg_array_tmp[2] >> 4) & 0x07;

                /*
                 * The fan divisor for fans 0-2 get bit 2 from
                 * bits 5-7 respectively of vbat register
                 */
                vbat_reg = w83791d_read(client, W83791D_REG_VBAT);
                for (i = 0; i < 3; i++)
                        data->fan_div[i] |= (vbat_reg >> (3 + i)) & 0x04;

                /* Update PWM duty cycle */
                for (i = 0; i < NUMBER_OF_PWM; i++) {
                        data->pwm[i] =  w83791d_read(client,
                                                W83791D_REG_PWM[i]);
                }

                /* Update PWM enable status */
                for (i = 0; i < 2; i++) {
                        reg_array_tmp[i] = w83791d_read(client,
                                                W83791D_REG_FAN_CFG[i]);
                }
                data->pwm_enable[0] = (reg_array_tmp[0] >> 2) & 0x03;
                data->pwm_enable[1] = (reg_array_tmp[0] >> 4) & 0x03;
                data->pwm_enable[2] = (reg_array_tmp[1] >> 2) & 0x03;

                /* Update PWM target temperature */
                for (i = 0; i < 3; i++) {
                        data->temp_target[i] = w83791d_read(client,
                                W83791D_REG_TEMP_TARGET[i]) & 0x7f;
                }

                /* Update PWM temperature tolerance */
                for (i = 0; i < 2; i++) {
                        reg_array_tmp[i] = w83791d_read(client,
                                        W83791D_REG_TEMP_TOL[i]);
                }
                data->temp_tolerance[0] = reg_array_tmp[0] & 0x0f;
                data->temp_tolerance[1] = (reg_array_tmp[0] >> 4) & 0x0f;
                data->temp_tolerance[2] = reg_array_tmp[1] & 0x0f;

                /* Update the first temperature sensor */
                for (i = 0; i < 3; i++) {
                        data->temp1[i] = w83791d_read(client,
                                                W83791D_REG_TEMP1[i]);
                }

                /* Update the rest of the temperature sensors */
                for (i = 0; i < 2; i++) {
                        for (j = 0; j < 3; j++) {
                                data->temp_add[i][j] =
                                        (w83791d_read(client,
                                        W83791D_REG_TEMP_ADD[i][j * 2]) << 8) |
                                        w83791d_read(client,
                                        W83791D_REG_TEMP_ADD[i][j * 2 + 1]);
                        }
                }

                /* Update the realtime status */
                data->alarms =
                        w83791d_read(client, W83791D_REG_ALARM1) +
                        (w83791d_read(client, W83791D_REG_ALARM2) << 8) +
                        (w83791d_read(client, W83791D_REG_ALARM3) << 16);

                /* Update the beep configuration information */
                data->beep_mask =
                        w83791d_read(client, W83791D_REG_BEEP_CTRL[0]) +
                        (w83791d_read(client, W83791D_REG_BEEP_CTRL[1]) << 8) +
                        (w83791d_read(client, W83791D_REG_BEEP_CTRL[2]) << 16);

                /* Extract global beep enable flag */
                data->beep_enable =
                        (data->beep_mask >> GLOBAL_BEEP_ENABLE_SHIFT) & 0x01;

                /* Update the cpu voltage information */
                i = w83791d_read(client, W83791D_REG_VID_FANDIV);
                data->vid = i & 0x0f;
                data->vid |= (w83791d_read(client, W83791D_REG_DID_VID4) & 0x01)
                                << 4;

                data->last_updated = jiffies;
                data->valid = 1;
        }

        mutex_unlock(&data->update_lock);

#ifdef DEBUG
        w83791d_print_debug(data, dev);
#endif

        return data;
}

#ifdef DEBUG
static void w83791d_print_debug(struct w83791d_data *data, struct device *dev)
{
        int i = 0, j = 0;

        dev_dbg(dev, "======Start of w83791d debug values======\n");
        dev_dbg(dev, "%d set of Voltages: ===>\n", NUMBER_OF_VIN);
        for (i = 0; i < NUMBER_OF_VIN; i++) {
                dev_dbg(dev, "vin[%d] is:     0x%02x\n", i, data->in[i]);
                dev_dbg(dev, "vin[%d] min is: 0x%02x\n", i, data->in_min[i]);
                dev_dbg(dev, "vin[%d] max is: 0x%02x\n", i, data->in_max[i]);
        }
        dev_dbg(dev, "%d set of Fan Counts/Divisors: ===>\n", NUMBER_OF_FANIN);
        for (i = 0; i < NUMBER_OF_FANIN; i++) {
                dev_dbg(dev, "fan[%d] is:     0x%02x\n", i, data->fan[i]);
                dev_dbg(dev, "fan[%d] min is: 0x%02x\n", i, data->fan_min[i]);
                dev_dbg(dev, "fan_div[%d] is: 0x%02x\n", i, data->fan_div[i]);
        }

        /*
         * temperature math is signed, but only print out the
         * bits that matter
         */
        dev_dbg(dev, "%d set of Temperatures: ===>\n", NUMBER_OF_TEMPIN);
        for (i = 0; i < 3; i++)
                dev_dbg(dev, "temp1[%d] is: 0x%02x\n", i, (u8) data->temp1[i]);
        for (i = 0; i < 2; i++) {
                for (j = 0; j < 3; j++) {
                        dev_dbg(dev, "temp_add[%d][%d] is: 0x%04x\n", i, j,
                                (u16) data->temp_add[i][j]);
                }
        }

        dev_dbg(dev, "Misc Information: ===>\n");
        dev_dbg(dev, "alarm is:     0x%08x\n", data->alarms);
        dev_dbg(dev, "beep_mask is: 0x%08x\n", data->beep_mask);
        dev_dbg(dev, "beep_enable is: %d\n", data->beep_enable);
        dev_dbg(dev, "vid is: 0x%02x\n", data->vid);
        dev_dbg(dev, "vrm is: 0x%02x\n", data->vrm);
        dev_dbg(dev, "=======End of w83791d debug values========\n");
        dev_dbg(dev, "\n");
}
#endif

module_i2c_driver(w83791d_driver);

MODULE_AUTHOR("Charles Spirakis <bezaur@gmail.com>");
MODULE_DESCRIPTION("W83791D driver");
MODULE_LICENSE("GPL");