w83791d.c

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/*
 * w83791d.c - Part of lm_sensors, Linux kernel modules for hardware
 *         monitoring
 *
 * Copyright (C) 2006-2007 Charles Spirakis <[email protected]>
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*
 * 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)      (SENSORS_LIMIT((((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 = SENSORS_LIMIT(rpm, 1, 1000000);
    return SENSORS_LIMIT((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)  ((val) <= -128000 ? 0x8000 : \
                 (val) >= 127500 ? 0x7F80 : \
                 (val) < 0 ? ((val) - 250) / 500 * 128 : \
                 ((val) + 250) / 500 * 128)

/* for thermal cruise target temp, 7-bits, LSB = 1 degree Celsius */
#define TARGET_TEMP_TO_REG(val)     ((val) < 0 ? 0 : \
                    (val) >= 127000 ? 127 : \
                    ((val) + 500) / 1000)

/* for thermal cruise temp tolerance, 4-bits, LSB = 1 degree Celsius */
#define TOL_TEMP_TO_REG(val)        ((val) >= 15000 ? 15 : \
                    ((val) + 500) / 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 = SENSORS_LIMIT(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] = SENSORS_LIMIT(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 reatime status of all sensors items: voltage, temp, fan */
static ssize_t show_alarms_reg(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(alarms, S_IRUGO, show_alarms_reg, NULL);

/* 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 show_vid_reg(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(cpu0_vid, S_IRUGO, show_vid_reg, NULL);

static ssize_t show_vrm_reg(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 store_vrm_reg(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;

    data->vrm = val;
    return count;
}

static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm_reg, store_vrm_reg);

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

    if (data->lm75[0] != NULL)
        i2c_unregister_device(data->lm75[0]);
    if (data->lm75[1] != NULL)
        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 <[email protected]>");
MODULE_DESCRIPTION("W83791D driver");
MODULE_LICENSE("GPL");