[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / hwmon / w83792d.c

/*
    w83792d.c - Part of lm_sensors, Linux kernel modules for hardware
                monitoring
    Copyright (C) 2004, 2005 Winbond Electronics Corp.
                        Chunhao Huang <DZShen@Winbond.com.tw>,
                        Rudolf Marek <r.marek@sh.cvut.cz>

    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.

    Note:
    1. This driver is only for 2.6 kernel, 2.4 kernel need a different driver.
    2. This driver is only for Winbond W83792D C version device, there
       are also some motherboards with B version W83792D device. The
       calculation method to in6-in7(measured value, limits) is a little
       different between C and B version. C or B version can be identified
       by CR[0x49h].
*/

/*
    Supports following chips:

    Chip        #vin    #fanin  #pwm    #temp   wchipid vendid  i2c     ISA
    w83792d     9       7       7       3       0x7a    0x5ca3  yes     no
*/

#include <linux/config.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>

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

/* Insmod parameters */
I2C_CLIENT_INSMOD_1(w83792d);
I2C_CLIENT_MODULE_PARM(force_subclients, "List of subclient addresses: "
                        "{bus, clientaddr, subclientaddr1, subclientaddr2}");

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

/* The W83792D registers */
static const u8 W83792D_REG_IN[9] = {
        0x20,   /* Vcore A in DataSheet */
        0x21,   /* Vcore B in DataSheet */
        0x22,   /* VIN0 in DataSheet */
        0x23,   /* VIN1 in DataSheet */
        0x24,   /* VIN2 in DataSheet */
        0x25,   /* VIN3 in DataSheet */
        0x26,   /* 5VCC in DataSheet */
        0xB0,   /* 5VSB in DataSheet */
        0xB1    /* VBAT in DataSheet */
};
#define W83792D_REG_LOW_BITS1 0x3E  /* Low Bits I in DataSheet */
#define W83792D_REG_LOW_BITS2 0x3F  /* Low Bits II in DataSheet */
static const u8 W83792D_REG_IN_MAX[9] = {
        0x2B,   /* Vcore A High Limit in DataSheet */
        0x2D,   /* Vcore B High Limit in DataSheet */
        0x2F,   /* VIN0 High Limit in DataSheet */
        0x31,   /* VIN1 High Limit in DataSheet */
        0x33,   /* VIN2 High Limit in DataSheet */
        0x35,   /* VIN3 High Limit in DataSheet */
        0x37,   /* 5VCC High Limit in DataSheet */
        0xB4,   /* 5VSB High Limit in DataSheet */
        0xB6    /* VBAT High Limit in DataSheet */
};
static const u8 W83792D_REG_IN_MIN[9] = {
        0x2C,   /* Vcore A Low Limit in DataSheet */
        0x2E,   /* Vcore B Low Limit in DataSheet */
        0x30,   /* VIN0 Low Limit in DataSheet */
        0x32,   /* VIN1 Low Limit in DataSheet */
        0x34,   /* VIN2 Low Limit in DataSheet */
        0x36,   /* VIN3 Low Limit in DataSheet */
        0x38,   /* 5VCC Low Limit in DataSheet */
        0xB5,   /* 5VSB Low Limit in DataSheet */
        0xB7    /* VBAT Low Limit in DataSheet */
};
static const u8 W83792D_REG_FAN[7] = {
        0x28,   /* FAN 1 Count in DataSheet */
        0x29,   /* FAN 2 Count in DataSheet */
        0x2A,   /* FAN 3 Count in DataSheet */
        0xB8,   /* FAN 4 Count in DataSheet */
        0xB9,   /* FAN 5 Count in DataSheet */
        0xBA,   /* FAN 6 Count in DataSheet */
        0xBE    /* FAN 7 Count in DataSheet */
};
static const u8 W83792D_REG_FAN_MIN[7] = {
        0x3B,   /* FAN 1 Count Low Limit in DataSheet */
        0x3C,   /* FAN 2 Count Low Limit in DataSheet */
        0x3D,   /* FAN 3 Count Low Limit in DataSheet */
        0xBB,   /* FAN 4 Count Low Limit in DataSheet */
        0xBC,   /* FAN 5 Count Low Limit in DataSheet */
        0xBD,   /* FAN 6 Count Low Limit in DataSheet */
        0xBF    /* FAN 7 Count Low Limit in DataSheet */
};
#define W83792D_REG_FAN_CFG 0x84        /* FAN Configuration in DataSheet */
static const u8 W83792D_REG_FAN_DIV[4] = {
        0x47,   /* contains FAN2 and FAN1 Divisor */
        0x5B,   /* contains FAN4 and FAN3 Divisor */
        0x5C,   /* contains FAN6 and FAN5 Divisor */
        0x9E    /* contains FAN7 Divisor. */
};
static const u8 W83792D_REG_PWM[7] = {
        0x81,   /* FAN 1 Duty Cycle, be used to control */
        0x83,   /* FAN 2 Duty Cycle, be used to control */
        0x94,   /* FAN 3 Duty Cycle, be used to control */
        0xA3,   /* FAN 4 Duty Cycle, be used to control */
        0xA4,   /* FAN 5 Duty Cycle, be used to control */
        0xA5,   /* FAN 6 Duty Cycle, be used to control */
        0xA6    /* FAN 7 Duty Cycle, be used to control */
};
#define W83792D_REG_BANK                0x4E
#define W83792D_REG_TEMP2_CONFIG        0xC2
#define W83792D_REG_TEMP3_CONFIG        0xCA

static const u8 W83792D_REG_TEMP1[3] = {
        0x27,   /* TEMP 1 in DataSheet */
        0x39,   /* TEMP 1 Over in DataSheet */
        0x3A,   /* TEMP 1 Hyst in DataSheet */
};

static const u8 W83792D_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 */
};

static const u8 W83792D_REG_THERMAL[3] = {
        0x85,   /* SmartFanI: Fan1 target value */
        0x86,   /* SmartFanI: Fan2 target value */
        0x96    /* SmartFanI: Fan3 target value */
};

static const u8 W83792D_REG_TOLERANCE[3] = {
        0x87,   /* (bit3-0)SmartFan Fan1 tolerance */
        0x87,   /* (bit7-4)SmartFan Fan2 tolerance */
        0x97    /* (bit3-0)SmartFan Fan3 tolerance */
};

static const u8 W83792D_REG_POINTS[3][4] = {
        { 0x85,         /* SmartFanII: Fan1 temp point 1 */
          0xE3,         /* SmartFanII: Fan1 temp point 2 */
          0xE4,         /* SmartFanII: Fan1 temp point 3 */
          0xE5 },       /* SmartFanII: Fan1 temp point 4 */
        { 0x86,         /* SmartFanII: Fan2 temp point 1 */
          0xE6,         /* SmartFanII: Fan2 temp point 2 */
          0xE7,         /* SmartFanII: Fan2 temp point 3 */
          0xE8 },       /* SmartFanII: Fan2 temp point 4 */
        { 0x96,         /* SmartFanII: Fan3 temp point 1 */
          0xE9,         /* SmartFanII: Fan3 temp point 2 */
          0xEA,         /* SmartFanII: Fan3 temp point 3 */
          0xEB }        /* SmartFanII: Fan3 temp point 4 */
};

static const u8 W83792D_REG_LEVELS[3][4] = {
        { 0x88,         /* (bit3-0) SmartFanII: Fan1 Non-Stop */
          0x88,         /* (bit7-4) SmartFanII: Fan1 Level 1 */
          0xE0,         /* (bit7-4) SmartFanII: Fan1 Level 2 */
          0xE0 },       /* (bit3-0) SmartFanII: Fan1 Level 3 */
        { 0x89,         /* (bit3-0) SmartFanII: Fan2 Non-Stop */
          0x89,         /* (bit7-4) SmartFanII: Fan2 Level 1 */
          0xE1,         /* (bit7-4) SmartFanII: Fan2 Level 2 */
          0xE1 },       /* (bit3-0) SmartFanII: Fan2 Level 3 */
        { 0x98,         /* (bit3-0) SmartFanII: Fan3 Non-Stop */
          0x98,         /* (bit7-4) SmartFanII: Fan3 Level 1 */
          0xE2,         /* (bit7-4) SmartFanII: Fan3 Level 2 */
          0xE2 }        /* (bit3-0) SmartFanII: Fan3 Level 3 */
};

#define W83792D_REG_GPIO_EN             0x1A
#define W83792D_REG_CONFIG              0x40
#define W83792D_REG_VID_FANDIV          0x47
#define W83792D_REG_CHIPID              0x49
#define W83792D_REG_WCHIPID             0x58
#define W83792D_REG_CHIPMAN             0x4F
#define W83792D_REG_PIN                 0x4B
#define W83792D_REG_I2C_SUBADDR         0x4A

#define W83792D_REG_ALARM1 0xA9         /* realtime status register1 */
#define W83792D_REG_ALARM2 0xAA         /* realtime status register2 */
#define W83792D_REG_ALARM3 0xAB         /* realtime status register3 */
#define W83792D_REG_CHASSIS 0x42        /* Bit 5: Case Open status bit */
#define W83792D_REG_CHASSIS_CLR 0x44    /* Bit 7: Case Open CLR_CHS/Reset bit */

/* control in0/in1 's limit modifiability */
#define W83792D_REG_VID_IN_B            0x17

#define W83792D_REG_VBAT                0x5D
#define W83792D_REG_I2C_ADDR            0x48

/* Conversions. Rounding and limit checking is only done on the TO_REG
   variants. Note that you should be a bit careful with which arguments
   these macros are called: arguments may be evaluated more than once.
   Fixing this is just not worth it. */
#define IN_FROM_REG(nr,val) (((nr)<=1)?(val*2): \
                                ((((nr)==6)||((nr)==7))?(val*6):(val*4)))
#define IN_TO_REG(nr,val) (((nr)<=1)?(val/2): \
                                ((((nr)==6)||((nr)==7))?(val/6):(val/4)))

static inline 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 */
#define TEMP1_TO_REG(val)       (SENSORS_LIMIT(((val) < 0 ? (val)+0x100*1000 \
                                        : (val)) / 1000, 0, 0xff))
#define TEMP1_FROM_REG(val)     (((val) & 0x80 ? (val)-0x100 : (val)) * 1000)
/* for temp2 and temp3, because they need addtional resolution */
#define TEMP_ADD_FROM_REG(val1, val2) \
        ((((val1) & 0x80 ? (val1)-0x100 \
                : (val1)) * 1000) + ((val2 & 0x80) ? 500 : 0))
#define TEMP_ADD_TO_REG_HIGH(val) \
        (SENSORS_LIMIT(((val) < 0 ? (val)+0x100*1000 \
                        : (val)) / 1000, 0, 0xff))
#define TEMP_ADD_TO_REG_LOW(val)        ((val%1000) ? 0x80 : 0x00)

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

static inline u8
DIV_TO_REG(long val)
{
        int i;
        val = SENSORS_LIMIT(val, 1, 128) >> 1;
        for (i = 0; i < 7; i++) {
                if (val == 0)
                        break;
                val >>= 1;
        }
        return ((u8) i);
}

struct w83792d_data {
        struct i2c_client client;
        struct class_device *class_dev;
        enum chips type;

        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];

        u8 in[9];               /* Register value */
        u8 in_max[9];           /* Register value */
        u8 in_min[9];           /* Register value */
        u16 low_bits;           /* Additional resolution to voltage in6-0 */
        u8 fan[7];              /* Register value */
        u8 fan_min[7];          /* Register value */
        u8 temp1[3];            /* current, over, thyst */
        u8 temp_add[2][6];      /* Register value */
        u8 fan_div[7];          /* Register encoding, shifted right */
        u8 pwm[7];              /* We only consider the first 3 set of pwm,
                                   although 792 chip has 7 set of pwm. */
        u8 pwmenable[3];
        u32 alarms;             /* realtime status register encoding,combined */
        u8 chassis;             /* Chassis status */
        u8 chassis_clear;       /* CLR_CHS, clear chassis intrusion detection */
        u8 thermal_cruise[3];   /* Smart FanI: Fan1,2,3 target value */
        u8 tolerance[3];        /* Fan1,2,3 tolerance(Smart Fan I/II) */
        u8 sf2_points[3][4];    /* Smart FanII: Fan1,2,3 temperature points */
        u8 sf2_levels[3][4];    /* Smart FanII: Fan1,2,3 duty cycle levels */
};

static int w83792d_attach_adapter(struct i2c_adapter *adapter);
static int w83792d_detect(struct i2c_adapter *adapter, int address, int kind);
static int w83792d_detach_client(struct i2c_client *client);
static struct w83792d_data *w83792d_update_device(struct device *dev);

#ifdef DEBUG
static void w83792d_print_debug(struct w83792d_data *data, struct device *dev);
#endif

static void w83792d_init_client(struct i2c_client *client);

static struct i2c_driver w83792d_driver = {
        .driver = {
                .name = "w83792d",
        },
        .attach_adapter = w83792d_attach_adapter,
        .detach_client = w83792d_detach_client,
};

static inline long in_count_from_reg(int nr, struct w83792d_data *data)
{
        /* in7 and in8 do not have low bits, but the formula still works */
        return ((data->in[nr] << 2) | ((data->low_bits >> (2 * nr)) & 0x03));
}

/* The SMBus locks itself. The Winbond W83792D chip has a bank register,
   but the driver only accesses registers in bank 0, so we don't have
   to switch banks and lock access between switches. */
static inline int w83792d_read_value(struct i2c_client *client, u8 reg)
{
        return i2c_smbus_read_byte_data(client, reg);
}

static inline int
w83792d_write_value(struct i2c_client *client, u8 reg, u8 value)
{
        return i2c_smbus_write_byte_data(client, reg, value);
}

/* following are the sysfs callback functions */
static ssize_t show_in(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 w83792d_data *data = w83792d_update_device(dev);
        return sprintf(buf,"%ld\n", IN_FROM_REG(nr,(in_count_from_reg(nr, data))));
}

#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); \
        int nr = sensor_attr->index; \
        struct w83792d_data *data = w83792d_update_device(dev); \
        return sprintf(buf,"%ld\n", (long)(IN_FROM_REG(nr, (data->reg[nr])*4))); \
}

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); \
        int nr = sensor_attr->index; \
        struct i2c_client *client = to_i2c_client(dev); \
        struct w83792d_data *data = i2c_get_clientdata(client); \
        u32 val; \
         \
        val = simple_strtoul(buf, NULL, 10); \
        data->in_##reg[nr] = SENSORS_LIMIT(IN_TO_REG(nr, val)/4, 0, 255); \
        w83792d_write_value(client, W83792D_REG_IN_##REG[nr], data->in_##reg[nr]); \
         \
        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),
};
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),
};
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),
};


#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); \
        int nr = sensor_attr->index - 1; \
        struct w83792d_data *data = w83792d_update_device(dev); \
        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);
        int nr = sensor_attr->index - 1;
        struct i2c_client *client = to_i2c_client(dev);
        struct w83792d_data *data = i2c_get_clientdata(client);
        u32 val;

        val = simple_strtoul(buf, NULL, 10);
        data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
        w83792d_write_value(client, W83792D_REG_FAN_MIN[nr],
                                data->fan_min[nr]);

        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 w83792d_data *data = w83792d_update_device(dev);
        return sprintf(buf, "%u\n", DIV_FROM_REG(data->fan_div[nr - 1]));
}

/* 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 suprise; 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);
        int nr = sensor_attr->index - 1;
        struct i2c_client *client = to_i2c_client(dev);
        struct w83792d_data *data = i2c_get_clientdata(client);
        unsigned long min;
        /*u8 reg;*/
        u8 fan_div_reg = 0;
        u8 tmp_fan_div;

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

        data->fan_div[nr] = DIV_TO_REG(simple_strtoul(buf, NULL, 10));

        fan_div_reg = w83792d_read_value(client, W83792D_REG_FAN_DIV[nr >> 1]);
        fan_div_reg &= (nr & 0x01) ? 0x8f : 0xf8;
        tmp_fan_div = (nr & 0x01) ? (((data->fan_div[nr]) << 4) & 0x70)
                                        : ((data->fan_div[nr]) & 0x07);
        w83792d_write_value(client, W83792D_REG_FAN_DIV[nr >> 1],
                                        fan_div_reg | tmp_fan_div);

        /* Restore fan_min */
        data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
        w83792d_write_value(client, W83792D_REG_FAN_MIN[nr], data->fan_min[nr]);

        return count;
}

static struct sensor_device_attribute sda_fan_input[] = {
        SENSOR_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 1),
        SENSOR_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 2),
        SENSOR_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 3),
        SENSOR_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 4),
        SENSOR_ATTR(fan5_input, S_IRUGO, show_fan, NULL, 5),
        SENSOR_ATTR(fan6_input, S_IRUGO, show_fan, NULL, 6),
        SENSOR_ATTR(fan7_input, S_IRUGO, show_fan, NULL, 7),
};
static struct sensor_device_attribute sda_fan_min[] = {
        SENSOR_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan_min, store_fan_min, 1),
        SENSOR_ATTR(fan2_min, S_IWUSR | S_IRUGO, show_fan_min, store_fan_min, 2),
        SENSOR_ATTR(fan3_min, S_IWUSR | S_IRUGO, show_fan_min, store_fan_min, 3),
        SENSOR_ATTR(fan4_min, S_IWUSR | S_IRUGO, show_fan_min, store_fan_min, 4),
        SENSOR_ATTR(fan5_min, S_IWUSR | S_IRUGO, show_fan_min, store_fan_min, 5),
        SENSOR_ATTR(fan6_min, S_IWUSR | S_IRUGO, show_fan_min, store_fan_min, 6),
        SENSOR_ATTR(fan7_min, S_IWUSR | S_IRUGO, show_fan_min, store_fan_min, 7),
};
static struct sensor_device_attribute sda_fan_div[] = {
        SENSOR_ATTR(fan1_div, S_IWUSR | S_IRUGO, show_fan_div, store_fan_div, 1),
        SENSOR_ATTR(fan2_div, S_IWUSR | S_IRUGO, show_fan_div, store_fan_div, 2),
        SENSOR_ATTR(fan3_div, S_IWUSR | S_IRUGO, show_fan_div, store_fan_div, 3),
        SENSOR_ATTR(fan4_div, S_IWUSR | S_IRUGO, show_fan_div, store_fan_div, 4),
        SENSOR_ATTR(fan5_div, S_IWUSR | S_IRUGO, show_fan_div, store_fan_div, 5),
        SENSOR_ATTR(fan6_div, S_IWUSR | S_IRUGO, show_fan_div, store_fan_div, 6),
        SENSOR_ATTR(fan7_div, S_IWUSR | S_IRUGO, show_fan_div, store_fan_div, 7),
};


/* read/write the temperature1, includes measured value and limits */

static ssize_t show_temp1(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 w83792d_data *data = w83792d_update_device(dev);
        return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->temp1[nr]));
}

static ssize_t store_temp1(struct device *dev, struct device_attribute *attr,
                                const char *buf, size_t count)
{
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        int nr = sensor_attr->index;
        struct i2c_client *client = to_i2c_client(dev);
        struct w83792d_data *data = i2c_get_clientdata(client);
        s32 val;

        val = simple_strtol(buf, NULL, 10);

        data->temp1[nr] = TEMP1_TO_REG(val);
        w83792d_write_value(client, W83792D_REG_TEMP1[nr],
                data->temp1[nr]);

        return count;
}

/* read/write the temperature2-3, includes measured value and limits */

static ssize_t show_temp23(struct device *dev, struct device_attribute *attr,
                                char *buf)
{
        struct sensor_device_attribute_2 *sensor_attr = to_sensor_dev_attr_2(attr);
        int nr = sensor_attr->nr;
        int index = sensor_attr->index;
        struct w83792d_data *data = w83792d_update_device(dev);
        return sprintf(buf,"%ld\n",
                (long)TEMP_ADD_FROM_REG(data->temp_add[nr][index],
                        data->temp_add[nr][index+1]));
}

static ssize_t store_temp23(struct device *dev, struct device_attribute *attr,
                                const char *buf, size_t count)
{
        struct sensor_device_attribute_2 *sensor_attr = to_sensor_dev_attr_2(attr);
        int nr = sensor_attr->nr;
        int index = sensor_attr->index;
        struct i2c_client *client = to_i2c_client(dev);
        struct w83792d_data *data = i2c_get_clientdata(client);
        s32 val;

        val = simple_strtol(buf, NULL, 10);

        data->temp_add[nr][index] = TEMP_ADD_TO_REG_HIGH(val);
        data->temp_add[nr][index+1] = TEMP_ADD_TO_REG_LOW(val);
        w83792d_write_value(client, W83792D_REG_TEMP_ADD[nr][index],
                data->temp_add[nr][index]);
        w83792d_write_value(client, W83792D_REG_TEMP_ADD[nr][index+1],
                data->temp_add[nr][index+1]);

        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, 2),
        SENSOR_ATTR_2(temp3_max, S_IRUGO | S_IWUSR, show_temp23, store_temp23, 1, 2),
};

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, 4),
        SENSOR_ATTR_2(temp3_max_hyst, S_IRUGO | S_IWUSR, show_temp23, store_temp23, 1, 4),
};

/* 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 w83792d_data *data = w83792d_update_device(dev);
        return sprintf(buf, "%d\n", data->alarms);
}

static
DEVICE_ATTR(alarms, S_IRUGO, show_alarms_reg, NULL);

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 w83792d_data *data = w83792d_update_device(dev);
        return sprintf(buf, "%d\n", (data->pwm[nr] & 0x0f) << 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 - 1;
        struct w83792d_data *data = w83792d_update_device(dev);
        long pwm_enable_tmp = 1;

        switch (data->pwmenable[nr]) {
        case 0:
                pwm_enable_tmp = 1; /* manual mode */
                break;
        case 1:
                pwm_enable_tmp = 3; /*thermal cruise/Smart Fan I */
                break;
        case 2:
                pwm_enable_tmp = 2; /* Smart Fan II */
                break;
        }

        return sprintf(buf, "%ld\n", pwm_enable_tmp);
}

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);
        int nr = sensor_attr->index;
        struct i2c_client *client = to_i2c_client(dev);
        struct w83792d_data *data = i2c_get_clientdata(client);
        u8 val = SENSORS_LIMIT(simple_strtoul(buf, NULL, 10), 0, 255) >> 4;

        mutex_lock(&data->update_lock);
        val |= w83792d_read_value(client, W83792D_REG_PWM[nr]) & 0xf0;
        data->pwm[nr] = val;
        w83792d_write_value(client, W83792D_REG_PWM[nr], data->pwm[nr]);
        mutex_unlock(&data->update_lock);

        return count;
}

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);
        int nr = sensor_attr->index - 1;
        struct i2c_client *client = to_i2c_client(dev);
        struct w83792d_data *data = i2c_get_clientdata(client);
        u32 val;
        u8 fan_cfg_tmp, cfg1_tmp, cfg2_tmp, cfg3_tmp, cfg4_tmp;

        val = simple_strtoul(buf, NULL, 10);
        switch (val) {
        case 1:
                data->pwmenable[nr] = 0; /* manual mode */
                break;
        case 2:
                data->pwmenable[nr] = 2; /* Smart Fan II */
                break;
        case 3:
                data->pwmenable[nr] = 1; /* thermal cruise/Smart Fan I */
                break;
        default:
                return -EINVAL;
        }
        cfg1_tmp = data->pwmenable[0];
        cfg2_tmp = (data->pwmenable[1]) << 2;
        cfg3_tmp = (data->pwmenable[2]) << 4;
        cfg4_tmp = w83792d_read_value(client,W83792D_REG_FAN_CFG) & 0xc0;
        fan_cfg_tmp = ((cfg4_tmp | cfg3_tmp) | cfg2_tmp) | cfg1_tmp;
        w83792d_write_value(client, W83792D_REG_FAN_CFG, fan_cfg_tmp);

        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),
};
static struct sensor_device_attribute sda_pwm_enable[] = {
        SENSOR_ATTR(pwm1_enable, S_IWUSR | S_IRUGO,
                    show_pwmenable, store_pwmenable, 1),
        SENSOR_ATTR(pwm2_enable, S_IWUSR | S_IRUGO,
                    show_pwmenable, store_pwmenable, 2),
        SENSOR_ATTR(pwm3_enable, S_IWUSR | S_IRUGO,
                    show_pwmenable, store_pwmenable, 3),
};


static ssize_t
show_pwm_mode(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 w83792d_data *data = w83792d_update_device(dev);
        return sprintf(buf, "%d\n", data->pwm[nr] >> 7);
}

static ssize_t
store_pwm_mode(struct device *dev, struct device_attribute *attr,
                        const char *buf, size_t count)
{
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        int nr = sensor_attr->index;
        struct i2c_client *client = to_i2c_client(dev);
        struct w83792d_data *data = i2c_get_clientdata(client);
        u32 val;

        val = simple_strtoul(buf, NULL, 10);
        if (val != 0 && val != 1)
                return -EINVAL;

        mutex_lock(&data->update_lock);
        data->pwm[nr] = w83792d_read_value(client, W83792D_REG_PWM[nr]);
        if (val) {                      /* PWM mode */
                data->pwm[nr] |= 0x80;
        } else {                        /* DC mode */
                data->pwm[nr] &= 0x7f;
        }
        w83792d_write_value(client, W83792D_REG_PWM[nr], data->pwm[nr]);
        mutex_unlock(&data->update_lock);

        return count;
}

static struct sensor_device_attribute sda_pwm_mode[] = {
        SENSOR_ATTR(pwm1_mode, S_IWUSR | S_IRUGO,
                    show_pwm_mode, store_pwm_mode, 0),
        SENSOR_ATTR(pwm2_mode, S_IWUSR | S_IRUGO,
                    show_pwm_mode, store_pwm_mode, 1),
        SENSOR_ATTR(pwm3_mode, S_IWUSR | S_IRUGO,
                    show_pwm_mode, store_pwm_mode, 2),
};


static ssize_t
show_regs_chassis(struct device *dev, struct device_attribute *attr,
                        char *buf)
{
        struct w83792d_data *data = w83792d_update_device(dev);
        return sprintf(buf, "%d\n", data->chassis);
}

static DEVICE_ATTR(chassis, S_IRUGO, show_regs_chassis, NULL);

static ssize_t
show_chassis_clear(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct w83792d_data *data = w83792d_update_device(dev);
        return sprintf(buf, "%d\n", data->chassis_clear);
}

static ssize_t
store_chassis_clear(struct device *dev, struct device_attribute *attr,
                        const char *buf, size_t count)
{
        struct i2c_client *client = to_i2c_client(dev);
        struct w83792d_data *data = i2c_get_clientdata(client);
        u32 val;
        u8 temp1 = 0, temp2 = 0;

        val = simple_strtoul(buf, NULL, 10);

        data->chassis_clear = SENSORS_LIMIT(val, 0 ,1);
        temp1 = ((data->chassis_clear) << 7) & 0x80;
        temp2 = w83792d_read_value(client,
                W83792D_REG_CHASSIS_CLR) & 0x7f;
        w83792d_write_value(client, W83792D_REG_CHASSIS_CLR, temp1 | temp2);

        return count;
}

static DEVICE_ATTR(chassis_clear, S_IRUGO | S_IWUSR,
                show_chassis_clear, store_chassis_clear);

/* For Smart Fan I / Thermal Cruise */
static ssize_t
show_thermal_cruise(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 w83792d_data *data = w83792d_update_device(dev);
        return sprintf(buf, "%ld\n", (long)data->thermal_cruise[nr-1]);
}

static ssize_t
store_thermal_cruise(struct device *dev, struct device_attribute *attr,
                        const char *buf, size_t count)
{
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        int nr = sensor_attr->index - 1;
        struct i2c_client *client = to_i2c_client(dev);
        struct w83792d_data *data = i2c_get_clientdata(client);
        u32 val;
        u8 target_tmp=0, target_mask=0;

        val = simple_strtoul(buf, NULL, 10);
        target_tmp = val;
        target_tmp = target_tmp & 0x7f;
        target_mask = w83792d_read_value(client, W83792D_REG_THERMAL[nr]) & 0x80;
        data->thermal_cruise[nr] = SENSORS_LIMIT(target_tmp, 0, 255);
        w83792d_write_value(client, W83792D_REG_THERMAL[nr],
                (data->thermal_cruise[nr]) | target_mask);

        return count;
}

static struct sensor_device_attribute sda_thermal_cruise[] = {
        SENSOR_ATTR(thermal_cruise1, S_IWUSR | S_IRUGO,
                    show_thermal_cruise, store_thermal_cruise, 1),
        SENSOR_ATTR(thermal_cruise2, S_IWUSR | S_IRUGO,
                    show_thermal_cruise, store_thermal_cruise, 2),
        SENSOR_ATTR(thermal_cruise3, S_IWUSR | S_IRUGO,
                    show_thermal_cruise, store_thermal_cruise, 3),
};

/* For Smart Fan I/Thermal Cruise and Smart Fan II */
static ssize_t
show_tolerance(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 w83792d_data *data = w83792d_update_device(dev);
        return sprintf(buf, "%ld\n", (long)data->tolerance[nr-1]);
}

static ssize_t
store_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);
        int nr = sensor_attr->index - 1;
        struct i2c_client *client = to_i2c_client(dev);
        struct w83792d_data *data = i2c_get_clientdata(client);
        u32 val;
        u8 tol_tmp, tol_mask;

        val = simple_strtoul(buf, NULL, 10);
        tol_mask = w83792d_read_value(client,
                W83792D_REG_TOLERANCE[nr]) & ((nr == 1) ? 0x0f : 0xf0);
        tol_tmp = SENSORS_LIMIT(val, 0, 15);
        tol_tmp &= 0x0f;
        data->tolerance[nr] = tol_tmp;
        if (nr == 1) {
                tol_tmp <<= 4;
        }
        w83792d_write_value(client, W83792D_REG_TOLERANCE[nr],
                tol_mask | tol_tmp);

        return count;
}

static struct sensor_device_attribute sda_tolerance[] = {
        SENSOR_ATTR(tolerance1, S_IWUSR | S_IRUGO,
                    show_tolerance, store_tolerance, 1),
        SENSOR_ATTR(tolerance2, S_IWUSR | S_IRUGO,
                    show_tolerance, store_tolerance, 2),
        SENSOR_ATTR(tolerance3, S_IWUSR | S_IRUGO,
                    show_tolerance, store_tolerance, 3),
};

/* For Smart Fan II */
static ssize_t
show_sf2_point(struct device *dev, struct device_attribute *attr,
                char *buf)
{
        struct sensor_device_attribute_2 *sensor_attr = to_sensor_dev_attr_2(attr);
        int nr = sensor_attr->nr;
        int index = sensor_attr->index;
        struct w83792d_data *data = w83792d_update_device(dev);
        return sprintf(buf, "%ld\n", (long)data->sf2_points[index-1][nr-1]);
}

static ssize_t
store_sf2_point(struct device *dev, struct device_attribute *attr,
                const char *buf, size_t count)
{
        struct sensor_device_attribute_2 *sensor_attr = to_sensor_dev_attr_2(attr);
        int nr = sensor_attr->nr - 1;
        int index = sensor_attr->index - 1;
        struct i2c_client *client = to_i2c_client(dev);
        struct w83792d_data *data = i2c_get_clientdata(client);
        u32 val;
        u8 mask_tmp = 0;

        val = simple_strtoul(buf, NULL, 10);
        data->sf2_points[index][nr] = SENSORS_LIMIT(val, 0, 127);
        mask_tmp = w83792d_read_value(client,
                                        W83792D_REG_POINTS[index][nr]) & 0x80;
        w83792d_write_value(client, W83792D_REG_POINTS[index][nr],
                mask_tmp|data->sf2_points[index][nr]);

        return count;
}

static struct sensor_device_attribute_2 sda_sf2_point[] = {
        SENSOR_ATTR_2(sf2_point1_fan1, S_IRUGO | S_IWUSR,
                      show_sf2_point, store_sf2_point, 1, 1),
        SENSOR_ATTR_2(sf2_point2_fan1, S_IRUGO | S_IWUSR,
                      show_sf2_point, store_sf2_point, 2, 1),
        SENSOR_ATTR_2(sf2_point3_fan1, S_IRUGO | S_IWUSR,
                      show_sf2_point, store_sf2_point, 3, 1),
        SENSOR_ATTR_2(sf2_point4_fan1, S_IRUGO | S_IWUSR,
                      show_sf2_point, store_sf2_point, 4, 1),

        SENSOR_ATTR_2(sf2_point1_fan2, S_IRUGO | S_IWUSR,
                      show_sf2_point, store_sf2_point, 1, 2),
        SENSOR_ATTR_2(sf2_point2_fan2, S_IRUGO | S_IWUSR,
                      show_sf2_point, store_sf2_point, 2, 2),
        SENSOR_ATTR_2(sf2_point3_fan2, S_IRUGO | S_IWUSR,
                      show_sf2_point, store_sf2_point, 3, 2),
        SENSOR_ATTR_2(sf2_point4_fan2, S_IRUGO | S_IWUSR,
                      show_sf2_point, store_sf2_point, 4, 2),

        SENSOR_ATTR_2(sf2_point1_fan3, S_IRUGO | S_IWUSR,
                      show_sf2_point, store_sf2_point, 1, 3),
        SENSOR_ATTR_2(sf2_point2_fan3, S_IRUGO | S_IWUSR,
                      show_sf2_point, store_sf2_point, 2, 3),
        SENSOR_ATTR_2(sf2_point3_fan3, S_IRUGO | S_IWUSR,
                      show_sf2_point, store_sf2_point, 3, 3),
        SENSOR_ATTR_2(sf2_point4_fan3, S_IRUGO | S_IWUSR,
                      show_sf2_point, store_sf2_point, 4, 3),
};


static ssize_t
show_sf2_level(struct device *dev, struct device_attribute *attr,
                char *buf)
{
        struct sensor_device_attribute_2 *sensor_attr = to_sensor_dev_attr_2(attr);
        int nr = sensor_attr->nr;
        int index = sensor_attr->index;
        struct w83792d_data *data = w83792d_update_device(dev);
        return sprintf(buf, "%d\n",
                        (((data->sf2_levels[index-1][nr]) * 100) / 15));
}

static ssize_t
store_sf2_level(struct device *dev, struct device_attribute *attr,
                const char *buf, size_t count)
{
        struct sensor_device_attribute_2 *sensor_attr = to_sensor_dev_attr_2(attr);
        int nr = sensor_attr->nr;
        int index = sensor_attr->index - 1;
        struct i2c_client *client = to_i2c_client(dev);
        struct w83792d_data *data = i2c_get_clientdata(client);
        u32 val;
        u8 mask_tmp=0, level_tmp=0;

        val = simple_strtoul(buf, NULL, 10);
        data->sf2_levels[index][nr] = SENSORS_LIMIT((val * 15) / 100, 0, 15);
        mask_tmp = w83792d_read_value(client, W83792D_REG_LEVELS[index][nr])
                & ((nr==3) ? 0xf0 : 0x0f);
        if (nr==3) {
                level_tmp = data->sf2_levels[index][nr];
        } else {
                level_tmp = data->sf2_levels[index][nr] << 4;
        }
        w83792d_write_value(client, W83792D_REG_LEVELS[index][nr], level_tmp | mask_tmp);

        return count;
}

static struct sensor_device_attribute_2 sda_sf2_level[] = {
        SENSOR_ATTR_2(sf2_level1_fan1, S_IRUGO | S_IWUSR,
                      show_sf2_level, store_sf2_level, 1, 1),
        SENSOR_ATTR_2(sf2_level2_fan1, S_IRUGO | S_IWUSR,
                      show_sf2_level, store_sf2_level, 2, 1),
        SENSOR_ATTR_2(sf2_level3_fan1, S_IRUGO | S_IWUSR,
                      show_sf2_level, store_sf2_level, 3, 1),

        SENSOR_ATTR_2(sf2_level1_fan2, S_IRUGO | S_IWUSR,
                      show_sf2_level, store_sf2_level, 1, 2),
        SENSOR_ATTR_2(sf2_level2_fan2, S_IRUGO | S_IWUSR,
                      show_sf2_level, store_sf2_level, 2, 2),
        SENSOR_ATTR_2(sf2_level3_fan2, S_IRUGO | S_IWUSR,
                      show_sf2_level, store_sf2_level, 3, 2),

        SENSOR_ATTR_2(sf2_level1_fan3, S_IRUGO | S_IWUSR,
                      show_sf2_level, store_sf2_level, 1, 3),
        SENSOR_ATTR_2(sf2_level2_fan3, S_IRUGO | S_IWUSR,
                      show_sf2_level, store_sf2_level, 2, 3),
        SENSOR_ATTR_2(sf2_level3_fan3, S_IRUGO | S_IWUSR,
                      show_sf2_level, store_sf2_level, 3, 3),
};

/* This function is called when:
     * w83792d_driver is inserted (when this module is loaded), for each
       available adapter
     * when a new adapter is inserted (and w83792d_driver is still present) */
static int
w83792d_attach_adapter(struct i2c_adapter *adapter)
{
        if (!(adapter->class & I2C_CLASS_HWMON))
                return 0;
        return i2c_probe(adapter, &addr_data, w83792d_detect);
}


static int
w83792d_create_subclient(struct i2c_adapter *adapter,
                                struct i2c_client *new_client, int addr,
                                struct i2c_client **sub_cli)
{
        int err;
        struct i2c_client *sub_client;

        (*sub_cli) = sub_client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
        if (!(sub_client)) {
                return -ENOMEM;
        }
        sub_client->addr = 0x48 + addr;
        i2c_set_clientdata(sub_client, NULL);
        sub_client->adapter = adapter;
        sub_client->driver = &w83792d_driver;
        sub_client->flags = 0;
        strlcpy(sub_client->name, "w83792d subclient", I2C_NAME_SIZE);
        if ((err = i2c_attach_client(sub_client))) {
                dev_err(&new_client->dev, "subclient registration "
                        "at address 0x%x failed\n", sub_client->addr);
                kfree(sub_client);
                return err;
        }
        return 0;
}


static int
w83792d_detect_subclients(struct i2c_adapter *adapter, int address, int kind,
                struct i2c_client *new_client)
{
        int i, id, err;
        u8 val;
        struct w83792d_data *data = i2c_get_clientdata(new_client);

        id = i2c_adapter_id(adapter);
        if (force_subclients[0] == id && force_subclients[1] == address) {
                for (i = 2; i <= 3; i++) {
                        if (force_subclients[i] < 0x48 ||
                            force_subclients[i] > 0x4f) {
                                dev_err(&new_client->dev, "invalid subclient "
                                        "address %d; must be 0x48-0x4f\n",
                                        force_subclients[i]);
                                err = -ENODEV;
                                goto ERROR_SC_0;
                        }
                }
                w83792d_write_value(new_client, W83792D_REG_I2C_SUBADDR,
                                        (force_subclients[2] & 0x07) |
                                        ((force_subclients[3] & 0x07) << 4));
        }

        val = w83792d_read_value(new_client, W83792D_REG_I2C_SUBADDR);
        if (!(val & 0x08)) {
                err = w83792d_create_subclient(adapter, new_client, val & 0x7,
                                                &data->lm75[0]);
                if (err < 0)
                        goto ERROR_SC_0;
        }
        if (!(val & 0x80)) {
                if ((data->lm75[0] != NULL) &&
                        ((val & 0x7) == ((val >> 4) & 0x7))) {
                        dev_err(&new_client->dev, "duplicate addresses 0x%x, "
                                "use force_subclient\n", data->lm75[0]->addr);
                        err = -ENODEV;
                        goto ERROR_SC_1;
                }
                err = w83792d_create_subclient(adapter, new_client,
                                                (val >> 4) & 0x7, &data->lm75[1]);
                if (err < 0)
                        goto ERROR_SC_1;
        }

        return 0;

/* Undo inits in case of errors */

ERROR_SC_1:
        if (data->lm75[0] != NULL) {
                i2c_detach_client(data->lm75[0]);
                kfree(data->lm75[0]);
        }
ERROR_SC_0:
        return err;
}

static void device_create_file_fan(struct device *dev, int i)
{
        device_create_file(dev, &sda_fan_input[i].dev_attr);
        device_create_file(dev, &sda_fan_div[i].dev_attr);
        device_create_file(dev, &sda_fan_min[i].dev_attr);
}

static int
w83792d_detect(struct i2c_adapter *adapter, int address, int kind)
{
        int i = 0, val1 = 0, val2;
        struct i2c_client *client;
        struct device *dev;
        struct w83792d_data *data;
        int err = 0;
        const char *client_name = "";

        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
                goto ERROR0;
        }

        /* OK. For now, we presume we have a valid client. We now create the
           client structure, even though we cannot fill it completely yet.
           But it allows us to access w83792d_{read,write}_value. */

        if (!(data = kzalloc(sizeof(struct w83792d_data), GFP_KERNEL))) {
                err = -ENOMEM;
                goto ERROR0;
        }

        client = &data->client;
        dev = &client->dev;
        i2c_set_clientdata(client, data);
        client->addr = address;
        client->adapter = adapter;
        client->driver = &w83792d_driver;
        client->flags = 0;

        /* Now, we do the remaining detection. */

        /* The w83792d may be stuck in some other bank than bank 0. This may
           make reading other information impossible. Specify a force=... or
           force_*=... parameter, and the Winbond will be reset to the right
           bank. */
        if (kind < 0) {
                if (w83792d_read_value(client, W83792D_REG_CONFIG) & 0x80) {
                        dev_dbg(dev, "Detection failed at step 1\n");
                        goto ERROR1;
                }
                val1 = w83792d_read_value(client, W83792D_REG_BANK);
                val2 = w83792d_read_value(client, W83792D_REG_CHIPMAN);
                /* Check for Winbond ID if in bank 0 */
                if (!(val1 & 0x07)) {  /* is Bank0 */
                        if (((!(val1 & 0x80)) && (val2 != 0xa3)) ||
                             ((val1 & 0x80) && (val2 != 0x5c))) {
                                dev_dbg(dev, "Detection failed at step 2\n");
                                goto ERROR1;
                        }
                }
                /* If Winbond chip, address of chip and W83792D_REG_I2C_ADDR
                   should match */
                if (w83792d_read_value(client,
                                        W83792D_REG_I2C_ADDR) != address) {
                        dev_dbg(dev, "Detection failed at step 3\n");
                        goto ERROR1;
                }
        }

        /* We have either had a force parameter, or we have already detected the
           Winbond. Put it now into bank 0 and Vendor ID High Byte */
        w83792d_write_value(client,
                            W83792D_REG_BANK,
                            (w83792d_read_value(client,
                                W83792D_REG_BANK) & 0x78) | 0x80);

        /* Determine the chip type. */
        if (kind <= 0) {
                /* get vendor ID */
                val2 = w83792d_read_value(client, W83792D_REG_CHIPMAN);
                if (val2 != 0x5c) {  /* the vendor is NOT Winbond */
                        goto ERROR1;
                }
                val1 = w83792d_read_value(client, W83792D_REG_WCHIPID);
                if (val1 == 0x7a) {
                        kind = w83792d;
                } else {
                        if (kind == 0)
                                        dev_warn(dev,
                                        "w83792d: Ignoring 'force' parameter for"
                                        " unknown chip at adapter %d, address"
                                        " 0x%02x\n", i2c_adapter_id(adapter),
                                        address);
                        goto ERROR1;
                }
        }

        if (kind == w83792d) {
                client_name = "w83792d";
        } else {
                dev_err(dev, "w83792d: Internal error: unknown"
                                          " kind (%d)?!?", kind);
                goto ERROR1;
        }

        /* Fill in the remaining client fields and put into the global list */
        strlcpy(client->name, client_name, I2C_NAME_SIZE);
        data->type = kind;

        data->valid = 0;
        mutex_init(&data->update_lock);

        /* Tell the I2C layer a new client has arrived */
        if ((err = i2c_attach_client(client)))
                goto ERROR1;

        if ((err = w83792d_detect_subclients(adapter, address,
                        kind, client)))
                goto ERROR2;

        /* Initialize the chip */
        w83792d_init_client(client);

        /* A few vars need to be filled upon startup */
        for (i = 0; i < 7; i++) {
                data->fan_min[i] = w83792d_read_value(client,
                                        W83792D_REG_FAN_MIN[i]);
        }

        /* Register sysfs hooks */
        data->class_dev = hwmon_device_register(dev);
        if (IS_ERR(data->class_dev)) {
                err = PTR_ERR(data->class_dev);
                goto ERROR3;
        }
        for (i = 0; i < 9; i++) {
                device_create_file(dev, &sda_in_input[i].dev_attr);
                device_create_file(dev, &sda_in_max[i].dev_attr);
                device_create_file(dev, &sda_in_min[i].dev_attr);
        }
        for (i = 0; i < 3; i++)
                device_create_file_fan(dev, i);

        /* Read GPIO enable register to check if pins for fan 4,5 are used as
           GPIO */
        val1 = w83792d_read_value(client, W83792D_REG_GPIO_EN);
        if (!(val1 & 0x40))
                device_create_file_fan(dev, 3);
        if (!(val1 & 0x20))
                device_create_file_fan(dev, 4);

        val1 = w83792d_read_value(client, W83792D_REG_PIN);
        if (val1 & 0x40)
                device_create_file_fan(dev, 5);
        if (val1 & 0x04)
                device_create_file_fan(dev, 6);

        for (i = 0; i < 3; i++) {
                device_create_file(dev, &sda_temp_input[i].dev_attr);
                device_create_file(dev, &sda_temp_max[i].dev_attr);
                device_create_file(dev, &sda_temp_max_hyst[i].dev_attr);
                device_create_file(dev, &sda_thermal_cruise[i].dev_attr);
                device_create_file(dev, &sda_tolerance[i].dev_attr);
        }

        for (i = 0; i < ARRAY_SIZE(sda_pwm); i++) {
                device_create_file(dev, &sda_pwm[i].dev_attr);
                device_create_file(dev, &sda_pwm_enable[i].dev_attr);
                device_create_file(dev, &sda_pwm_mode[i].dev_attr);
        }

        device_create_file(dev, &dev_attr_alarms);
        device_create_file(dev, &dev_attr_chassis);
        device_create_file(dev, &dev_attr_chassis_clear);

        for (i = 0; i < ARRAY_SIZE(sda_sf2_point); i++)
                device_create_file(dev, &sda_sf2_point[i].dev_attr);

        for (i = 0; i < ARRAY_SIZE(sda_sf2_level); i++)
                device_create_file(dev, &sda_sf2_level[i].dev_attr);

        return 0;

ERROR3:
        if (data->lm75[0] != NULL) {
                i2c_detach_client(data->lm75[0]);
                kfree(data->lm75[0]);
        }
        if (data->lm75[1] != NULL) {
                i2c_detach_client(data->lm75[1]);
                kfree(data->lm75[1]);
        }
ERROR2:
        i2c_detach_client(client);
ERROR1:
        kfree(data);
ERROR0:
        return err;
}

static int
w83792d_detach_client(struct i2c_client *client)
{
        struct w83792d_data *data = i2c_get_clientdata(client);
        int err;

        /* main client */
        if (data)
                hwmon_device_unregister(data->class_dev);

        if ((err = i2c_detach_client(client)))
                return err;

        /* main client */
        if (data)
                kfree(data);
        /* subclient */
        else
                kfree(client);

        return 0;
}

static void
w83792d_init_client(struct i2c_client *client)
{
        u8 temp2_cfg, temp3_cfg, vid_in_b;

        if (init) {
                w83792d_write_value(client, W83792D_REG_CONFIG, 0x80);
        }
        /* Clear the bit6 of W83792D_REG_VID_IN_B(set it into 0):
           W83792D_REG_VID_IN_B bit6 = 0: the high/low limit of
             vin0/vin1 can be modified by user;
           W83792D_REG_VID_IN_B bit6 = 1: the high/low limit of
             vin0/vin1 auto-updated, can NOT be modified by user. */
        vid_in_b = w83792d_read_value(client, W83792D_REG_VID_IN_B);
        w83792d_write_value(client, W83792D_REG_VID_IN_B,
                            vid_in_b & 0xbf);

        temp2_cfg = w83792d_read_value(client, W83792D_REG_TEMP2_CONFIG);
        temp3_cfg = w83792d_read_value(client, W83792D_REG_TEMP3_CONFIG);
        w83792d_write_value(client, W83792D_REG_TEMP2_CONFIG,
                                temp2_cfg & 0xe6);
        w83792d_write_value(client, W83792D_REG_TEMP3_CONFIG,
                                temp3_cfg & 0xe6);

        /* Start monitoring */
        w83792d_write_value(client, W83792D_REG_CONFIG,
                            (w83792d_read_value(client,
                                                W83792D_REG_CONFIG) & 0xf7)
                            | 0x01);
}

static struct w83792d_data *w83792d_update_device(struct device *dev)
{
        struct i2c_client *client = to_i2c_client(dev);
        struct w83792d_data *data = i2c_get_clientdata(client);
        int i, j;
        u8 reg_array_tmp[4], reg_tmp;

        mutex_lock(&data->update_lock);

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

                /* Update the voltages measured value and limits */
                for (i = 0; i < 9; i++) {
                        data->in[i] = w83792d_read_value(client,
                                                W83792D_REG_IN[i]);
                        data->in_max[i] = w83792d_read_value(client,
                                                W83792D_REG_IN_MAX[i]);
                        data->in_min[i] = w83792d_read_value(client,
                                                W83792D_REG_IN_MIN[i]);
                }
                data->low_bits = w83792d_read_value(client,
                                                W83792D_REG_LOW_BITS1) +
                                 (w83792d_read_value(client,
                                                W83792D_REG_LOW_BITS2) << 8);
                for (i = 0; i < 7; i++) {
                        /* Update the Fan measured value and limits */
                        data->fan[i] = w83792d_read_value(client,
                                                W83792D_REG_FAN[i]);
                        data->fan_min[i] = w83792d_read_value(client,
                                                W83792D_REG_FAN_MIN[i]);
                        /* Update the PWM/DC Value and PWM/DC flag */
                        data->pwm[i] = w83792d_read_value(client,
                                                W83792D_REG_PWM[i]);
                }

                reg_tmp = w83792d_read_value(client, W83792D_REG_FAN_CFG);
                data->pwmenable[0] = reg_tmp & 0x03;
                data->pwmenable[1] = (reg_tmp>>2) & 0x03;
                data->pwmenable[2] = (reg_tmp>>4) & 0x03;

                for (i = 0; i < 3; i++) {
                        data->temp1[i] = w83792d_read_value(client,
                                                        W83792D_REG_TEMP1[i]);
                }
                for (i = 0; i < 2; i++) {
                        for (j = 0; j < 6; j++) {
                                data->temp_add[i][j] = w83792d_read_value(
                                        client,W83792D_REG_TEMP_ADD[i][j]);
                        }
                }

                /* Update the Fan Divisor */
                for (i = 0; i < 4; i++) {
                        reg_array_tmp[i] = w83792d_read_value(client,
                                                        W83792D_REG_FAN_DIV[i]);
                }
                data->fan_div[0] = reg_array_tmp[0] & 0x07;
                data->fan_div[1] = (reg_array_tmp[0] >> 4) & 0x07;
                data->fan_div[2] = reg_array_tmp[1] & 0x07;
                data->fan_div[3] = (reg_array_tmp[1] >> 4) & 0x07;
                data->fan_div[4] = reg_array_tmp[2] & 0x07;
                data->fan_div[5] = (reg_array_tmp[2] >> 4) & 0x07;
                data->fan_div[6] = reg_array_tmp[3] & 0x07;

                /* Update the realtime status */
                data->alarms = w83792d_read_value(client, W83792D_REG_ALARM1) +
                        (w83792d_read_value(client, W83792D_REG_ALARM2) << 8) +
                        (w83792d_read_value(client, W83792D_REG_ALARM3) << 16);

                /* Update CaseOpen status and it's CLR_CHS. */
                data->chassis = (w83792d_read_value(client,
                        W83792D_REG_CHASSIS) >> 5) & 0x01;
                data->chassis_clear = (w83792d_read_value(client,
                        W83792D_REG_CHASSIS_CLR) >> 7) & 0x01;

                /* Update Thermal Cruise/Smart Fan I target value */
                for (i = 0; i < 3; i++) {
                        data->thermal_cruise[i] =
                                w83792d_read_value(client,
                                W83792D_REG_THERMAL[i]) & 0x7f;
                }

                /* Update Smart Fan I/II tolerance */
                reg_tmp = w83792d_read_value(client, W83792D_REG_TOLERANCE[0]);
                data->tolerance[0] = reg_tmp & 0x0f;
                data->tolerance[1] = (reg_tmp >> 4) & 0x0f;
                data->tolerance[2] = w83792d_read_value(client,
                                        W83792D_REG_TOLERANCE[2]) & 0x0f;

                /* Update Smart Fan II temperature points */
                for (i = 0; i < 3; i++) {
                        for (j = 0; j < 4; j++) {
                                data->sf2_points[i][j] = w83792d_read_value(
                                        client,W83792D_REG_POINTS[i][j]) & 0x7f;
                        }
                }

                /* Update Smart Fan II duty cycle levels */
                for (i = 0; i < 3; i++) {
                        reg_tmp = w83792d_read_value(client,
                                                W83792D_REG_LEVELS[i][0]);
                        data->sf2_levels[i][0] = reg_tmp & 0x0f;
                        data->sf2_levels[i][1] = (reg_tmp >> 4) & 0x0f;
                        reg_tmp = w83792d_read_value(client,
                                                W83792D_REG_LEVELS[i][2]);
                        data->sf2_levels[i][2] = (reg_tmp >> 4) & 0x0f;
                        data->sf2_levels[i][3] = reg_tmp & 0x0f;
                }

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

        mutex_unlock(&data->update_lock);

#ifdef DEBUG
        w83792d_print_debug(data, dev);
#endif

        return data;
}

#ifdef DEBUG
static void w83792d_print_debug(struct w83792d_data *data, struct device *dev)
{
        int i=0, j=0;
        dev_dbg(dev, "==========The following is the debug message...========\n");
        dev_dbg(dev, "9 set of Voltages: =====>\n");
        for (i=0; i<9; i++) {
                dev_dbg(dev, "vin[%d] is: 0x%x\n", i, data->in[i]);
                dev_dbg(dev, "vin[%d] max is: 0x%x\n", i, data->in_max[i]);
                dev_dbg(dev, "vin[%d] min is: 0x%x\n", i, data->in_min[i]);
        }
        dev_dbg(dev, "Low Bit1 is: 0x%x\n", data->low_bits & 0xff);
        dev_dbg(dev, "Low Bit2 is: 0x%x\n", data->low_bits >> 8);
        dev_dbg(dev, "7 set of Fan Counts and Duty Cycles: =====>\n");
        for (i=0; i<7; i++) {
                dev_dbg(dev, "fan[%d] is: 0x%x\n", i, data->fan[i]);
                dev_dbg(dev, "fan[%d] min is: 0x%x\n", i, data->fan_min[i]);
                dev_dbg(dev, "pwm[%d]     is: 0x%x\n", i, data->pwm[i]);
        }
        dev_dbg(dev, "3 set of Temperatures: =====>\n");
        for (i=0; i<3; i++) {
                dev_dbg(dev, "temp1[%d] is: 0x%x\n", i, data->temp1[i]);
        }

        for (i=0; i<2; i++) {
                for (j=0; j<6; j++) {
                        dev_dbg(dev, "temp_add[%d][%d] is: 0x%x\n", i, j,
                                                        data->temp_add[i][j]);
                }
        }

        for (i=0; i<7; i++) {
                dev_dbg(dev, "fan_div[%d] is: 0x%x\n", i, data->fan_div[i]);
        }
        dev_dbg(dev, "==========End of the debug message...==================\n");
        dev_dbg(dev, "\n");
}
#endif

static int __init
sensors_w83792d_init(void)
{
        return i2c_add_driver(&w83792d_driver);
}

static void __exit
sensors_w83792d_exit(void)
{
        i2c_del_driver(&w83792d_driver);
}

MODULE_AUTHOR("Chunhao Huang @ Winbond <DZShen@Winbond.com.tw>");
MODULE_DESCRIPTION("W83792AD/D driver for linux-2.6");
MODULE_LICENSE("GPL");

module_init(sensors_w83792d_init);
module_exit(sensors_w83792d_exit);