/*
 * w83781d.c - Part of lm_sensors, Linux kernel modules for hardware
 *             monitoring
 * Copyright (c) 1998 - 2001  Frodo Looijaard <frodol@dds.nl>,
 *                            Philip Edelbrock <phil@netroedge.com>,
 *                            and Mark Studebaker <mdsxyz123@yahoo.com>
 * Copyright (c) 2007 - 2008  Jean Delvare <jdelvare@suse.de>
 *
 * 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
 * as99127f     7       3       0       3       0x31    0x12c3  yes     no
 * as99127f rev.2 (type_name = as99127f)        0x31    0x5ca3  yes     no
 * w83781d      7       3       0       3       0x10-1  0x5ca3  yes     yes
 * w83782d      9       3       2-4     3       0x30    0x5ca3  yes     yes
 * w83783s      5-6     3       2       1-2     0x40    0x5ca3  yes     no
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

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

#ifdef CONFIG_ISA
#include <linux/platform_device.h>
#include <linux/ioport.h>
#include <linux/io.h>
#endif

#include "lm75.h"

/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
                                                0x2e, 0x2f, I2C_CLIENT_END };

enum chips { w83781d, w83782d, w83783s, as99127f };

/* 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 reset chip on load");

static bool init = 1;
module_param(init, bool, 0);
MODULE_PARM_DESC(init, "Set to zero to bypass chip initialization");

/* Constants specified below */

/* Length of ISA address segment */
#define W83781D_EXTENT                  8

/* Where are the ISA address/data registers relative to the base address */
#define W83781D_ADDR_REG_OFFSET         5
#define W83781D_DATA_REG_OFFSET         6

/* The device registers */
/* in nr from 0 to 8 */
#define W83781D_REG_IN_MAX(nr)          ((nr < 7) ? (0x2b + (nr) * 2) : \
                                                    (0x554 + (((nr) - 7) * 2)))
#define W83781D_REG_IN_MIN(nr)          ((nr < 7) ? (0x2c + (nr) * 2) : \
                                                    (0x555 + (((nr) - 7) * 2)))
#define W83781D_REG_IN(nr)              ((nr < 7) ? (0x20 + (nr)) : \
                                                    (0x550 + (nr) - 7))

/* fan nr from 0 to 2 */
#define W83781D_REG_FAN_MIN(nr)         (0x3b + (nr))
#define W83781D_REG_FAN(nr)             (0x28 + (nr))

#define W83781D_REG_BANK                0x4E
#define W83781D_REG_TEMP2_CONFIG        0x152
#define W83781D_REG_TEMP3_CONFIG        0x252
/* temp nr from 1 to 3 */
#define W83781D_REG_TEMP(nr)            ((nr == 3) ? (0x0250) : \
                                        ((nr == 2) ? (0x0150) : \
                                                     (0x27)))
#define W83781D_REG_TEMP_HYST(nr)       ((nr == 3) ? (0x253) : \
                                        ((nr == 2) ? (0x153) : \
                                                     (0x3A)))
#define W83781D_REG_TEMP_OVER(nr)       ((nr == 3) ? (0x255) : \
                                        ((nr == 2) ? (0x155) : \
                                                     (0x39)))

#define W83781D_REG_CONFIG              0x40

/* Interrupt status (W83781D, AS99127F) */
#define W83781D_REG_ALARM1              0x41
#define W83781D_REG_ALARM2              0x42

/* Real-time status (W83782D, W83783S) */
#define W83782D_REG_ALARM1              0x459
#define W83782D_REG_ALARM2              0x45A
#define W83782D_REG_ALARM3              0x45B

#define W83781D_REG_BEEP_CONFIG         0x4D
#define W83781D_REG_BEEP_INTS1          0x56
#define W83781D_REG_BEEP_INTS2          0x57
#define W83781D_REG_BEEP_INTS3          0x453   /* not on W83781D */

#define W83781D_REG_VID_FANDIV          0x47

#define W83781D_REG_CHIPID              0x49
#define W83781D_REG_WCHIPID             0x58
#define W83781D_REG_CHIPMAN             0x4F
#define W83781D_REG_PIN                 0x4B

/* 782D/783S only */
#define W83781D_REG_VBAT                0x5D

/* PWM 782D (1-4) and 783S (1-2) only */
static const u8 W83781D_REG_PWM[] = { 0x5B, 0x5A, 0x5E, 0x5F };
#define W83781D_REG_PWMCLK12            0x5C
#define W83781D_REG_PWMCLK34            0x45C

#define W83781D_REG_I2C_ADDR            0x48
#define W83781D_REG_I2C_SUBADDR         0x4A

/*
 * The following are undocumented in the data sheets however we
 * received the information in an email from Winbond tech support
 */
/* Sensor selection - not on 781d */
#define W83781D_REG_SCFG1               0x5D
static const u8 BIT_SCFG1[] = { 0x02, 0x04, 0x08 };

#define W83781D_REG_SCFG2               0x59
static const u8 BIT_SCFG2[] = { 0x10, 0x20, 0x40 };

#define W83781D_DEFAULT_BETA            3435

/* Conversions */
#define IN_TO_REG(val)                  clamp_val(((val) + 8) / 16, 0, 255)
#define IN_FROM_REG(val)                ((val) * 16)

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

static inline long
FAN_FROM_REG(u8 val, int div)
{
        if (val == 0)
                return -1;
        if (val == 255)
                return 0;
        return 1350000 / (val * div);
}

#define TEMP_TO_REG(val)                clamp_val((val) / 1000, -127, 128)
#define TEMP_FROM_REG(val)              ((val) * 1000)

#define BEEP_MASK_FROM_REG(val, type)   ((type) == as99127f ? \
                                         (~(val)) & 0x7fff : (val) & 0xff7fff)
#define BEEP_MASK_TO_REG(val, type)     ((type) == as99127f ? \
                                         (~(val)) & 0x7fff : (val) & 0xff7fff)

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

static inline u8
DIV_TO_REG(long val, enum chips type)
{
        int i;
        val = clamp_val(val, 1,
                        ((type == w83781d || type == as99127f) ? 8 : 128)) >> 1;
        for (i = 0; i < 7; i++) {
                if (val == 0)
                        break;
                val >>= 1;
        }
        return i;
}

struct w83781d_data {
        struct i2c_client *client;
        struct device *hwmon_dev;
        struct mutex lock;
        enum chips type;

        /* For ISA device only */
        const char *name;
        int isa_addr;

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

        struct i2c_client *lm75[2];     /* for secondary I2C addresses */
        /* array of 2 pointers to subclients */

        u8 in[9];               /* Register value - 8 & 9 for 782D only */
        u8 in_max[9];           /* Register value - 8 & 9 for 782D only */
        u8 in_min[9];           /* Register value - 8 & 9 for 782D only */
        u8 fan[3];              /* Register value */
        u8 fan_min[3];          /* Register value */
        s8 temp;                /* Register value */
        s8 temp_max;            /* Register value */
        s8 temp_max_hyst;       /* Register value */
        u16 temp_add[2];        /* Register value */
        u16 temp_max_add[2];    /* Register value */
        u16 temp_max_hyst_add[2];       /* Register value */
        u8 fan_div[3];          /* Register encoding, shifted right */
        u8 vid;                 /* Register encoding, combined */
        u32 alarms;             /* Register encoding, combined */
        u32 beep_mask;          /* Register encoding, combined */
        u8 pwm[4];              /* Register value */
        u8 pwm2_enable;         /* Boolean */
        u16 sens[3];            /*
                                 * 782D/783S only.
                                 * 1 = pentium diode; 2 = 3904 diode;
                                 * 4 = thermistor
                                 */
        u8 vrm;
};

static struct w83781d_data *w83781d_data_if_isa(void);
static int w83781d_alias_detect(struct i2c_client *client, u8 chipid);

static int w83781d_read_value(struct w83781d_data *data, u16 reg);
static int w83781d_write_value(struct w83781d_data *data, u16 reg, u16 value);
static struct w83781d_data *w83781d_update_device(struct device *dev);
static void w83781d_init_device(struct device *dev);

/* following are the sysfs callback functions */
#define show_in_reg(reg) \
static ssize_t show_##reg(struct device *dev, struct device_attribute *da, \
                char *buf) \
{ \
        struct sensor_device_attribute *attr = to_sensor_dev_attr(da); \
        struct w83781d_data *data = w83781d_update_device(dev); \
        return sprintf(buf, "%ld\n", \
                       (long)IN_FROM_REG(data->reg[attr->index])); \
}
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 \
                *da, const char *buf, size_t count) \
{ \
        struct sensor_device_attribute *attr = to_sensor_dev_attr(da); \
        struct w83781d_data *data = dev_get_drvdata(dev); \
        int nr = 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); \
        w83781d_write_value(data, W83781D_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);

#define sysfs_in_offsets(offset) \
static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
                show_in, NULL, offset); \
static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
                show_in_min, store_in_min, offset); \
static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
                show_in_max, store_in_max, offset)

sysfs_in_offsets(0);
sysfs_in_offsets(1);
sysfs_in_offsets(2);
sysfs_in_offsets(3);
sysfs_in_offsets(4);
sysfs_in_offsets(5);
sysfs_in_offsets(6);
sysfs_in_offsets(7);
sysfs_in_offsets(8);

#define show_fan_reg(reg) \
static ssize_t show_##reg(struct device *dev, struct device_attribute *da, \
                char *buf) \
{ \
        struct sensor_device_attribute *attr = to_sensor_dev_attr(da); \
        struct w83781d_data *data = w83781d_update_device(dev); \
        return sprintf(buf, "%ld\n", \
                FAN_FROM_REG(data->reg[attr->index], \
                        DIV_FROM_REG(data->fan_div[attr->index]))); \
}
show_fan_reg(fan);
show_fan_reg(fan_min);

static ssize_t
store_fan_min(struct device *dev, struct device_attribute *da,
                const char *buf, size_t count)
{
        struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
        struct w83781d_data *data = dev_get_drvdata(dev);
        int nr = 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]));
        w83781d_write_value(data, W83781D_REG_FAN_MIN(nr),
                            data->fan_min[nr]);

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

static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO | S_IWUSR,
                show_fan_min, store_fan_min, 0);
static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO | S_IWUSR,
                show_fan_min, store_fan_min, 1);
static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2);
static SENSOR_DEVICE_ATTR(fan3_min, S_IRUGO | S_IWUSR,
                show_fan_min, store_fan_min, 2);

#define show_temp_reg(reg) \
static ssize_t show_##reg(struct device *dev, struct device_attribute *da, \
                char *buf) \
{ \
        struct sensor_device_attribute *attr = to_sensor_dev_attr(da); \
        struct w83781d_data *data = w83781d_update_device(dev); \
        int nr = attr->index; \
        if (nr >= 2) {  /* TEMP2 and TEMP3 */ \
                return sprintf(buf, "%d\n", \
                        LM75_TEMP_FROM_REG(data->reg##_add[nr-2])); \
        } else {        /* TEMP1 */ \
                return sprintf(buf, "%ld\n", (long)TEMP_FROM_REG(data->reg)); \
        } \
}
show_temp_reg(temp);
show_temp_reg(temp_max);
show_temp_reg(temp_max_hyst);

#define store_temp_reg(REG, reg) \
static ssize_t store_temp_##reg(struct device *dev, \
                struct device_attribute *da, const char *buf, size_t count) \
{ \
        struct sensor_device_attribute *attr = to_sensor_dev_attr(da); \
        struct w83781d_data *data = dev_get_drvdata(dev); \
        int nr = attr->index; \
        long val; \
        int err = kstrtol(buf, 10, &val); \
        if (err) \
                return err; \
        mutex_lock(&data->update_lock); \
         \
        if (nr >= 2) {  /* TEMP2 and TEMP3 */ \
                data->temp_##reg##_add[nr-2] = LM75_TEMP_TO_REG(val); \
                w83781d_write_value(data, W83781D_REG_TEMP_##REG(nr), \
                                data->temp_##reg##_add[nr-2]); \
        } else {        /* TEMP1 */ \
                data->temp_##reg = TEMP_TO_REG(val); \
                w83781d_write_value(data, W83781D_REG_TEMP_##REG(nr), \
                        data->temp_##reg); \
        } \
         \
        mutex_unlock(&data->update_lock); \
        return count; \
}
store_temp_reg(OVER, max);
store_temp_reg(HYST, max_hyst);

#define sysfs_temp_offsets(offset) \
static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
                show_temp, NULL, offset); \
static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
                show_temp_max, store_temp_max, offset); \
static SENSOR_DEVICE_ATTR(temp##offset##_max_hyst, S_IRUGO | S_IWUSR, \
                show_temp_max_hyst, store_temp_max_hyst, offset);

sysfs_temp_offsets(1);
sysfs_temp_offsets(2);
sysfs_temp_offsets(3);

static ssize_t
show_vid_reg(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct w83781d_data *data = w83781d_update_device(dev);
        return sprintf(buf, "%ld\n", (long) 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 w83781d_data *data = dev_get_drvdata(dev);
        return sprintf(buf, "%ld\n", (long) data->vrm);
}

static ssize_t
store_vrm_reg(struct device *dev, struct device_attribute *attr,
              const char *buf, size_t count)
{
        struct w83781d_data *data = dev_get_drvdata(dev);
        unsigned long val;
        int err;

        err = kstrtoul(buf, 10, &val);
        if (err)
                return err;
        data->vrm = clamp_val(val, 0, 255);

        return count;
}

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

static ssize_t
show_alarms_reg(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct w83781d_data *data = w83781d_update_device(dev);
        return sprintf(buf, "%u\n", data->alarms);
}

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

static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
                char *buf)
{
        struct w83781d_data *data = w83781d_update_device(dev);
        int bitnr = to_sensor_dev_attr(attr)->index;
        return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
}

/* The W83781D has a single alarm bit for temp2 and temp3 */
static ssize_t show_temp3_alarm(struct device *dev,
                struct device_attribute *attr, char *buf)
{
        struct w83781d_data *data = w83781d_update_device(dev);
        int bitnr = (data->type == w83781d) ? 5 : 13;
        return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
}

static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 10);
static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 16);
static SENSOR_DEVICE_ATTR(in8_alarm, S_IRUGO, show_alarm, NULL, 17);
static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 11);
static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5);
static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_temp3_alarm, NULL, 0);

static ssize_t show_beep_mask(struct device *dev,
                               struct device_attribute *attr, char *buf)
{
        struct w83781d_data *data = w83781d_update_device(dev);
        return sprintf(buf, "%ld\n",
                       (long)BEEP_MASK_FROM_REG(data->beep_mask, data->type));
}

static ssize_t
store_beep_mask(struct device *dev, struct device_attribute *attr,
                const char *buf, size_t count)
{
        struct w83781d_data *data = dev_get_drvdata(dev);
        unsigned long val;
        int err;

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

        mutex_lock(&data->update_lock);
        data->beep_mask &= 0x8000; /* preserve beep enable */
        data->beep_mask |= BEEP_MASK_TO_REG(val, data->type);
        w83781d_write_value(data, W83781D_REG_BEEP_INTS1,
                            data->beep_mask & 0xff);
        w83781d_write_value(data, W83781D_REG_BEEP_INTS2,
                            (data->beep_mask >> 8) & 0xff);
        if (data->type != w83781d && data->type != as99127f) {
                w83781d_write_value(data, W83781D_REG_BEEP_INTS3,
                                    ((data->beep_mask) >> 16) & 0xff);
        }
        mutex_unlock(&data->update_lock);

        return count;
}

static DEVICE_ATTR(beep_mask, S_IRUGO | S_IWUSR,
                show_beep_mask, store_beep_mask);

static ssize_t show_beep(struct device *dev, struct device_attribute *attr,
                char *buf)
{
        struct w83781d_data *data = w83781d_update_device(dev);
        int bitnr = to_sensor_dev_attr(attr)->index;
        return sprintf(buf, "%u\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 w83781d_data *data = dev_get_drvdata(dev);
        int bitnr = to_sensor_dev_attr(attr)->index;
        u8 reg;
        unsigned long bit;
        int err;

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

        if (bit & ~1)
                return -EINVAL;

        mutex_lock(&data->update_lock);
        if (bit)
                data->beep_mask |= (1 << bitnr);
        else
                data->beep_mask &= ~(1 << bitnr);

        if (bitnr < 8) {
                reg = w83781d_read_value(data, W83781D_REG_BEEP_INTS1);
                if (bit)
                        reg |= (1 << bitnr);
                else
                        reg &= ~(1 << bitnr);
                w83781d_write_value(data, W83781D_REG_BEEP_INTS1, reg);
        } else if (bitnr < 16) {
                reg = w83781d_read_value(data, W83781D_REG_BEEP_INTS2);
                if (bit)
                        reg |= (1 << (bitnr - 8));
                else
                        reg &= ~(1 << (bitnr - 8));
                w83781d_write_value(data, W83781D_REG_BEEP_INTS2, reg);
        } else {
                reg = w83781d_read_value(data, W83781D_REG_BEEP_INTS3);
                if (bit)
                        reg |= (1 << (bitnr - 16));
                else
                        reg &= ~(1 << (bitnr - 16));
                w83781d_write_value(data, W83781D_REG_BEEP_INTS3, reg);
        }
        mutex_unlock(&data->update_lock);

        return count;
}

/* The W83781D has a single beep bit for temp2 and temp3 */
static ssize_t show_temp3_beep(struct device *dev,
                struct device_attribute *attr, char *buf)
{
        struct w83781d_data *data = w83781d_update_device(dev);
        int bitnr = (data->type == w83781d) ? 5 : 13;
        return sprintf(buf, "%u\n", (data->beep_mask >> bitnr) & 1);
}

static SENSOR_DEVICE_ATTR(in0_beep, S_IRUGO | S_IWUSR,
                        show_beep, store_beep, 0);
static SENSOR_DEVICE_ATTR(in1_beep, S_IRUGO | S_IWUSR,
                        show_beep, store_beep, 1);
static SENSOR_DEVICE_ATTR(in2_beep, S_IRUGO | S_IWUSR,
                        show_beep, store_beep, 2);
static SENSOR_DEVICE_ATTR(in3_beep, S_IRUGO | S_IWUSR,
                        show_beep, store_beep, 3);
static SENSOR_DEVICE_ATTR(in4_beep, S_IRUGO | S_IWUSR,
                        show_beep, store_beep, 8);
static SENSOR_DEVICE_ATTR(in5_beep, S_IRUGO | S_IWUSR,
                        show_beep, store_beep, 9);
static SENSOR_DEVICE_ATTR(in6_beep, S_IRUGO | S_IWUSR,
                        show_beep, store_beep, 10);
static SENSOR_DEVICE_ATTR(in7_beep, S_IRUGO | S_IWUSR,
                        show_beep, store_beep, 16);
static SENSOR_DEVICE_ATTR(in8_beep, S_IRUGO | S_IWUSR,
                        show_beep, store_beep, 17);
static SENSOR_DEVICE_ATTR(fan1_beep, S_IRUGO | S_IWUSR,
                        show_beep, store_beep, 6);
static SENSOR_DEVICE_ATTR(fan2_beep, S_IRUGO | S_IWUSR,
                        show_beep, store_beep, 7);
static SENSOR_DEVICE_ATTR(fan3_beep, S_IRUGO | S_IWUSR,
                        show_beep, store_beep, 11);
static SENSOR_DEVICE_ATTR(temp1_beep, S_IRUGO | S_IWUSR,
                        show_beep, store_beep, 4);
static SENSOR_DEVICE_ATTR(temp2_beep, S_IRUGO | S_IWUSR,
                        show_beep, store_beep, 5);
static SENSOR_DEVICE_ATTR(temp3_beep, S_IRUGO,
                        show_temp3_beep, store_beep, 13);
static SENSOR_DEVICE_ATTR(beep_enable, S_IRUGO | S_IWUSR,
                        show_beep, store_beep, 15);

static ssize_t
show_fan_div(struct device *dev, struct device_attribute *da, char *buf)
{
        struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
        struct w83781d_data *data = w83781d_update_device(dev);
        return sprintf(buf, "%ld\n",
                       (long) DIV_FROM_REG(data->fan_div[attr->index]));
}

/*
 * 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 *da,
                const char *buf, size_t count)
{
        struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
        struct w83781d_data *data = dev_get_drvdata(dev);
        unsigned long min;
        int nr = attr->index;
        u8 reg;
        unsigned long val;
        int err;

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

        mutex_lock(&data->update_lock);

        /* 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(val, data->type);

        reg = (w83781d_read_value(data, nr == 2 ?
                                  W83781D_REG_PIN : W83781D_REG_VID_FANDIV)
                & (nr == 0 ? 0xcf : 0x3f))
              | ((data->fan_div[nr] & 0x03) << (nr == 0 ? 4 : 6));
        w83781d_write_value(data, nr == 2 ?
                            W83781D_REG_PIN : W83781D_REG_VID_FANDIV, reg);

        /* w83781d and as99127f don't have extended divisor bits */
        if (data->type != w83781d && data->type != as99127f) {
                reg = (w83781d_read_value(data, W83781D_REG_VBAT)
                       & ~(1 << (5 + nr)))
                    | ((data->fan_div[nr] & 0x04) << (3 + nr));
                w83781d_write_value(data, W83781D_REG_VBAT, reg);
        }

        /* Restore fan_min */
        data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
        w83781d_write_value(data, W83781D_REG_FAN_MIN(nr), data->fan_min[nr]);

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

static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
                show_fan_div, store_fan_div, 0);
static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR,
                show_fan_div, store_fan_div, 1);
static SENSOR_DEVICE_ATTR(fan3_div, S_IRUGO | S_IWUSR,
                show_fan_div, store_fan_div, 2);

static ssize_t
show_pwm(struct device *dev, struct device_attribute *da, char *buf)
{
        struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
        struct w83781d_data *data = w83781d_update_device(dev);
        return sprintf(buf, "%d\n", (int)data->pwm[attr->index]);
}

static ssize_t
show_pwm2_enable(struct device *dev, struct device_attribute *da, char *buf)
{
        struct w83781d_data *data = w83781d_update_device(dev);
        return sprintf(buf, "%d\n", (int)data->pwm2_enable);
}

static ssize_t
store_pwm(struct device *dev, struct device_attribute *da, const char *buf,
                size_t count)
{
        struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
        struct w83781d_data *data = dev_get_drvdata(dev);
        int nr = attr->index;
        unsigned long val;
        int err;

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

        mutex_lock(&data->update_lock);
        data->pwm[nr] = clamp_val(val, 0, 255);
        w83781d_write_value(data, W83781D_REG_PWM[nr], data->pwm[nr]);
        mutex_unlock(&data->update_lock);
        return count;
}

static ssize_t
store_pwm2_enable(struct device *dev, struct device_attribute *da,
                const char *buf, size_t count)
{
        struct w83781d_data *data = dev_get_drvdata(dev);
        unsigned long val;
        u32 reg;
        int err;

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

        mutex_lock(&data->update_lock);

        switch (val) {
        case 0:
        case 1:
                reg = w83781d_read_value(data, W83781D_REG_PWMCLK12);
                w83781d_write_value(data, W83781D_REG_PWMCLK12,
                                    (reg & 0xf7) | (val << 3));

                reg = w83781d_read_value(data, W83781D_REG_BEEP_CONFIG);
                w83781d_write_value(data, W83781D_REG_BEEP_CONFIG,
                                    (reg & 0xef) | (!val << 4));

                data->pwm2_enable = val;
                break;

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

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

static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm, store_pwm, 0);
static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, show_pwm, store_pwm, 1);
static SENSOR_DEVICE_ATTR(pwm3, S_IRUGO | S_IWUSR, show_pwm, store_pwm, 2);
static SENSOR_DEVICE_ATTR(pwm4, S_IRUGO | S_IWUSR, show_pwm, store_pwm, 3);
/* only PWM2 can be enabled/disabled */
static DEVICE_ATTR(pwm2_enable, S_IRUGO | S_IWUSR,
                show_pwm2_enable, store_pwm2_enable);

static ssize_t
show_sensor(struct device *dev, struct device_attribute *da, char *buf)
{
        struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
        struct w83781d_data *data = w83781d_update_device(dev);
        return sprintf(buf, "%d\n", (int)data->sens[attr->index]);
}

static ssize_t
store_sensor(struct device *dev, struct device_attribute *da,
                const char *buf, size_t count)
{
        struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
        struct w83781d_data *data = dev_get_drvdata(dev);
        int nr = attr->index;
        unsigned long val;
        u32 tmp;
        int err;

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

        mutex_lock(&data->update_lock);

        switch (val) {
        case 1:         /* PII/Celeron diode */
                tmp = w83781d_read_value(data, W83781D_REG_SCFG1);
                w83781d_write_value(data, W83781D_REG_SCFG1,
                                    tmp | BIT_SCFG1[nr]);
                tmp = w83781d_read_value(data, W83781D_REG_SCFG2);
                w83781d_write_value(data, W83781D_REG_SCFG2,
                                    tmp | BIT_SCFG2[nr]);
                data->sens[nr] = val;
                break;
        case 2:         /* 3904 */
                tmp = w83781d_read_value(data, W83781D_REG_SCFG1);
                w83781d_write_value(data, W83781D_REG_SCFG1,
                                    tmp | BIT_SCFG1[nr]);
                tmp = w83781d_read_value(data, W83781D_REG_SCFG2);
                w83781d_write_value(data, W83781D_REG_SCFG2,
                                    tmp & ~BIT_SCFG2[nr]);
                data->sens[nr] = val;
                break;
        case W83781D_DEFAULT_BETA:
                dev_warn(dev,
                         "Sensor type %d is deprecated, please use 4 instead\n",
                         W83781D_DEFAULT_BETA);
                /* fall through */
        case 4:         /* thermistor */
                tmp = w83781d_read_value(data, W83781D_REG_SCFG1);
                w83781d_write_value(data, W83781D_REG_SCFG1,
                                    tmp & ~BIT_SCFG1[nr]);
                data->sens[nr] = val;
                break;
        default:
                dev_err(dev, "Invalid sensor type %ld; must be 1, 2, or 4\n",
                       (long) val);
                break;
        }

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

static SENSOR_DEVICE_ATTR(temp1_type, S_IRUGO | S_IWUSR,
        show_sensor, store_sensor, 0);
static SENSOR_DEVICE_ATTR(temp2_type, S_IRUGO | S_IWUSR,
        show_sensor, store_sensor, 1);
static SENSOR_DEVICE_ATTR(temp3_type, S_IRUGO | S_IWUSR,
        show_sensor, store_sensor, 2);

/*
 * Assumes that adapter is of I2C, not ISA variety.
 * OTHERWISE DON'T CALL THIS
 */
static int
w83781d_detect_subclients(struct i2c_client *new_client)
{
        int i, val1 = 0, id;
        int err;
        int address = new_client->addr;
        unsigned short sc_addr[2];
        struct i2c_adapter *adapter = new_client->adapter;
        struct w83781d_data *data = i2c_get_clientdata(new_client);
        enum chips kind = data->type;
        int num_sc = 1;

        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 = -EINVAL;
                                goto ERROR_SC_1;
                        }
                }
                w83781d_write_value(data, W83781D_REG_I2C_SUBADDR,
                                (force_subclients[2] & 0x07) |
                                ((force_subclients[3] & 0x07) << 4));
                sc_addr[0] = force_subclients[2];
        } else {
                val1 = w83781d_read_value(data, W83781D_REG_I2C_SUBADDR);
                sc_addr[0] = 0x48 + (val1 & 0x07);
        }

        if (kind != w83783s) {
                num_sc = 2;
                if (force_subclients[0] == id &&
                    force_subclients[1] == address) {
                        sc_addr[1] = force_subclients[3];
                } else {
                        sc_addr[1] = 0x48 + ((val1 >> 4) & 0x07);
                }
                if (sc_addr[0] == sc_addr[1]) {
                        dev_err(&new_client->dev,
                               "Duplicate addresses 0x%x for subclients.\n",
                               sc_addr[0]);
                        err = -EBUSY;
                        goto ERROR_SC_2;
                }
        }

        for (i = 0; i < num_sc; i++) {
                data->lm75[i] = i2c_new_dummy(adapter, sc_addr[i]);
                if (!data->lm75[i]) {
                        dev_err(&new_client->dev,
                                "Subclient %d registration at address 0x%x failed.\n",
                                i, sc_addr[i]);
                        err = -ENOMEM;
                        if (i == 1)
                                goto ERROR_SC_3;
                        goto ERROR_SC_2;
                }
        }

        return 0;

/* Undo inits in case of errors */
ERROR_SC_3:
        i2c_unregister_device(data->lm75[0]);
ERROR_SC_2:
ERROR_SC_1:
        return err;
}

#define IN_UNIT_ATTRS(X)                                        \
        &sensor_dev_attr_in##X##_input.dev_attr.attr,           \
        &sensor_dev_attr_in##X##_min.dev_attr.attr,             \
        &sensor_dev_attr_in##X##_max.dev_attr.attr,             \
        &sensor_dev_attr_in##X##_alarm.dev_attr.attr,           \
        &sensor_dev_attr_in##X##_beep.dev_attr.attr

#define FAN_UNIT_ATTRS(X)                                       \
        &sensor_dev_attr_fan##X##_input.dev_attr.attr,          \
        &sensor_dev_attr_fan##X##_min.dev_attr.attr,            \
        &sensor_dev_attr_fan##X##_div.dev_attr.attr,            \
        &sensor_dev_attr_fan##X##_alarm.dev_attr.attr,          \
        &sensor_dev_attr_fan##X##_beep.dev_attr.attr

#define TEMP_UNIT_ATTRS(X)                                      \
        &sensor_dev_attr_temp##X##_input.dev_attr.attr,         \
        &sensor_dev_attr_temp##X##_max.dev_attr.attr,           \
        &sensor_dev_attr_temp##X##_max_hyst.dev_attr.attr,      \
        &sensor_dev_attr_temp##X##_alarm.dev_attr.attr,         \
        &sensor_dev_attr_temp##X##_beep.dev_attr.attr

static struct attribute *w83781d_attributes[] = {
        IN_UNIT_ATTRS(0),
        IN_UNIT_ATTRS(2),
        IN_UNIT_ATTRS(3),
        IN_UNIT_ATTRS(4),
        IN_UNIT_ATTRS(5),
        IN_UNIT_ATTRS(6),
        FAN_UNIT_ATTRS(1),
        FAN_UNIT_ATTRS(2),
        FAN_UNIT_ATTRS(3),
        TEMP_UNIT_ATTRS(1),
        TEMP_UNIT_ATTRS(2),
        &dev_attr_cpu0_vid.attr,
        &dev_attr_vrm.attr,
        &dev_attr_alarms.attr,
        &dev_attr_beep_mask.attr,
        &sensor_dev_attr_beep_enable.dev_attr.attr,
        NULL
};
static const struct attribute_group w83781d_group = {
        .attrs = w83781d_attributes,
};

static struct attribute *w83781d_attributes_in1[] = {
        IN_UNIT_ATTRS(1),
        NULL
};
static const struct attribute_group w83781d_group_in1 = {
        .attrs = w83781d_attributes_in1,
};

static struct attribute *w83781d_attributes_in78[] = {
        IN_UNIT_ATTRS(7),
        IN_UNIT_ATTRS(8),
        NULL
};
static const struct attribute_group w83781d_group_in78 = {
        .attrs = w83781d_attributes_in78,
};

static struct attribute *w83781d_attributes_temp3[] = {
        TEMP_UNIT_ATTRS(3),
        NULL
};
static const struct attribute_group w83781d_group_temp3 = {
        .attrs = w83781d_attributes_temp3,

};

static struct attribute *w83781d_attributes_pwm12[] = {
        &sensor_dev_attr_pwm1.dev_attr.attr,
        &sensor_dev_attr_pwm2.dev_attr.attr,
        &dev_attr_pwm2_enable.attr,
        NULL
};
static const struct attribute_group w83781d_group_pwm12 = {
        .attrs = w83781d_attributes_pwm12,
};

static struct attribute *w83781d_attributes_pwm34[] = {
        &sensor_dev_attr_pwm3.dev_attr.attr,
        &sensor_dev_attr_pwm4.dev_attr.attr,
        NULL
};
static const struct attribute_group w83781d_group_pwm34 = {
        .attrs = w83781d_attributes_pwm34,
};

static struct attribute *w83781d_attributes_other[] = {
        &sensor_dev_attr_temp1_type.dev_attr.attr,
        &sensor_dev_attr_temp2_type.dev_attr.attr,
        &sensor_dev_attr_temp3_type.dev_attr.attr,
        NULL
};
static const struct attribute_group w83781d_group_other = {
        .attrs = w83781d_attributes_other,
};

/* No clean up is done on error, it's up to the caller */
static int
w83781d_create_files(struct device *dev, int kind, int is_isa)
{
        int err;

        err = sysfs_create_group(&dev->kobj, &w83781d_group);
        if (err)
                return err;

        if (kind != w83783s) {
                err = sysfs_create_group(&dev->kobj, &w83781d_group_in1);
                if (err)
                        return err;
        }
        if (kind != as99127f && kind != w83781d && kind != w83783s) {
                err = sysfs_create_group(&dev->kobj, &w83781d_group_in78);
                if (err)
                        return err;
        }
        if (kind != w83783s) {
                err = sysfs_create_group(&dev->kobj, &w83781d_group_temp3);
                if (err)
                        return err;

                if (kind != w83781d) {
                        err = sysfs_chmod_file(&dev->kobj,
                                &sensor_dev_attr_temp3_alarm.dev_attr.attr,
                                S_IRUGO | S_IWUSR);
                        if (err)
                                return err;
                }
        }

        if (kind != w83781d && kind != as99127f) {
                err = sysfs_create_group(&dev->kobj, &w83781d_group_pwm12);
                if (err)
                        return err;
        }
        if (kind == w83782d && !is_isa) {
                err = sysfs_create_group(&dev->kobj, &w83781d_group_pwm34);
                if (err)
                        return err;
        }

        if (kind != as99127f && kind != w83781d) {
                err = device_create_file(dev,
                                         &sensor_dev_attr_temp1_type.dev_attr);
                if (err)
                        return err;
                err = device_create_file(dev,
                                         &sensor_dev_attr_temp2_type.dev_attr);
                if (err)
                        return err;
                if (kind != w83783s) {
                        err = device_create_file(dev,
                                        &sensor_dev_attr_temp3_type.dev_attr);
                        if (err)
                                return err;
                }
        }

        return 0;
}

/* Return 0 if detection is successful, -ENODEV otherwise */
static int
w83781d_detect(struct i2c_client *client, struct i2c_board_info *info)
{
        int val1, val2;
        struct w83781d_data *isa = w83781d_data_if_isa();
        struct i2c_adapter *adapter = client->adapter;
        int address = client->addr;
        const char *client_name;
        enum vendor { winbond, asus } vendid;

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

        /*
         * We block updates of the ISA device to minimize the risk of
         * concurrent access to the same W83781D chip through different
         * interfaces.
         */
        if (isa)
                mutex_lock(&isa->update_lock);

        if (i2c_smbus_read_byte_data(client, W83781D_REG_CONFIG) & 0x80) {
                dev_dbg(&adapter->dev,
                        "Detection of w83781d chip failed at step 3\n");
                goto err_nodev;
        }

        val1 = i2c_smbus_read_byte_data(client, W83781D_REG_BANK);
        val2 = i2c_smbus_read_byte_data(client, W83781D_REG_CHIPMAN);
        /* Check for Winbond or Asus ID if in bank 0 */
        if (!(val1 & 0x07) &&
            ((!(val1 & 0x80) && val2 != 0xa3 && val2 != 0xc3) ||
             ((val1 & 0x80) && val2 != 0x5c && val2 != 0x12))) {
                dev_dbg(&adapter->dev,
                        "Detection of w83781d chip failed at step 4\n");
                goto err_nodev;
        }
        /*
         * If Winbond SMBus, check address at 0x48.
         * Asus doesn't support, except for as99127f rev.2
         */
        if ((!(val1 & 0x80) && val2 == 0xa3) ||
            ((val1 & 0x80) && val2 == 0x5c)) {
                if (i2c_smbus_read_byte_data(client, W83781D_REG_I2C_ADDR)
                    != address) {
                        dev_dbg(&adapter->dev,
                                "Detection of w83781d chip failed at step 5\n");
                        goto err_nodev;
                }
        }

        /* Put it now into bank 0 and Vendor ID High Byte */
        i2c_smbus_write_byte_data(client, W83781D_REG_BANK,
                (i2c_smbus_read_byte_data(client, W83781D_REG_BANK)
                 & 0x78) | 0x80);

        /* Get the vendor ID */
        val2 = i2c_smbus_read_byte_data(client, W83781D_REG_CHIPMAN);
        if (val2 == 0x5c)
                vendid = winbond;
        else if (val2 == 0x12)
                vendid = asus;
        else {
                dev_dbg(&adapter->dev,
                        "w83781d chip vendor is neither Winbond nor Asus\n");
                goto err_nodev;
        }

        /* Determine the chip type. */
        val1 = i2c_smbus_read_byte_data(client, W83781D_REG_WCHIPID);
        if ((val1 == 0x10 || val1 == 0x11) && vendid == winbond)
                client_name = "w83781d";
        else if (val1 == 0x30 && vendid == winbond)
                client_name = "w83782d";
        else if (val1 == 0x40 && vendid == winbond && address == 0x2d)
                client_name = "w83783s";
        else if (val1 == 0x31)
                client_name = "as99127f";
        else
                goto err_nodev;

        if (val1 <= 0x30 && w83781d_alias_detect(client, val1)) {
                dev_dbg(&adapter->dev,
                        "Device at 0x%02x appears to be the same as ISA device\n",
                        address);
                goto err_nodev;
        }

        if (isa)
                mutex_unlock(&isa->update_lock);

        strlcpy(info->type, client_name, I2C_NAME_SIZE);

        return 0;

 err_nodev:
        if (isa)
                mutex_unlock(&isa->update_lock);
        return -ENODEV;
}

static void w83781d_remove_files(struct device *dev)
{
        sysfs_remove_group(&dev->kobj, &w83781d_group);
        sysfs_remove_group(&dev->kobj, &w83781d_group_in1);
        sysfs_remove_group(&dev->kobj, &w83781d_group_in78);
        sysfs_remove_group(&dev->kobj, &w83781d_group_temp3);
        sysfs_remove_group(&dev->kobj, &w83781d_group_pwm12);
        sysfs_remove_group(&dev->kobj, &w83781d_group_pwm34);
        sysfs_remove_group(&dev->kobj, &w83781d_group_other);
}

static int
w83781d_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
        struct device *dev = &client->dev;
        struct w83781d_data *data;
        int err;

        data = devm_kzalloc(dev, sizeof(struct w83781d_data), GFP_KERNEL);
        if (!data)
                return -ENOMEM;

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

        data->type = id->driver_data;
        data->client = client;

        /* attach secondary i2c lm75-like clients */
        err = w83781d_detect_subclients(client);
        if (err)
                return err;

        /* Initialize the chip */
        w83781d_init_device(dev);

        /* Register sysfs hooks */
        err = w83781d_create_files(dev, data->type, 0);
        if (err)
                goto exit_remove_files;

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

        return 0;

 exit_remove_files:
        w83781d_remove_files(dev);
        if (data->lm75[0])
                i2c_unregister_device(data->lm75[0]);
        if (data->lm75[1])
                i2c_unregister_device(data->lm75[1]);
        return err;
}

static int
w83781d_remove(struct i2c_client *client)
{
        struct w83781d_data *data = i2c_get_clientdata(client);
        struct device *dev = &client->dev;

        hwmon_device_unregister(data->hwmon_dev);
        w83781d_remove_files(dev);

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

        return 0;
}

static int
w83781d_read_value_i2c(struct w83781d_data *data, u16 reg)
{
        struct i2c_client *client = data->client;
        int res, bank;
        struct i2c_client *cl;

        bank = (reg >> 8) & 0x0f;
        if (bank > 2)
                /* switch banks */
                i2c_smbus_write_byte_data(client, W83781D_REG_BANK,
                                          bank);
        if (bank == 0 || bank > 2) {
                res = i2c_smbus_read_byte_data(client, reg & 0xff);
        } else {
                /* switch to subclient */
                cl = data->lm75[bank - 1];
                /* convert from ISA to LM75 I2C addresses */
                switch (reg & 0xff) {
                case 0x50:      /* TEMP */
                        res = i2c_smbus_read_word_swapped(cl, 0);
                        break;
                case 0x52:      /* CONFIG */
                        res = i2c_smbus_read_byte_data(cl, 1);
                        break;
                case 0x53:      /* HYST */
                        res = i2c_smbus_read_word_swapped(cl, 2);
                        break;
                case 0x55:      /* OVER */
                default:
                        res = i2c_smbus_read_word_swapped(cl, 3);
                        break;
                }
        }
        if (bank > 2)
                i2c_smbus_write_byte_data(client, W83781D_REG_BANK, 0);

        return res;
}

static int
w83781d_write_value_i2c(struct w83781d_data *data, u16 reg, u16 value)
{
        struct i2c_client *client = data->client;
        int bank;
        struct i2c_client *cl;

        bank = (reg >> 8) & 0x0f;
        if (bank > 2)
                /* switch banks */
                i2c_smbus_write_byte_data(client, W83781D_REG_BANK,
                                          bank);
        if (bank == 0 || bank > 2) {
                i2c_smbus_write_byte_data(client, reg & 0xff,
                                          value & 0xff);
        } else {
                /* switch to subclient */
                cl = data->lm75[bank - 1];
                /* convert from ISA to LM75 I2C addresses */
                switch (reg & 0xff) {
                case 0x52:      /* CONFIG */
                        i2c_smbus_write_byte_data(cl, 1, value & 0xff);
                        break;
                case 0x53:      /* HYST */
                        i2c_smbus_write_word_swapped(cl, 2, value);
                        break;
                case 0x55:      /* OVER */
                        i2c_smbus_write_word_swapped(cl, 3, value);
                        break;
                }
        }
        if (bank > 2)
                i2c_smbus_write_byte_data(client, W83781D_REG_BANK, 0);

        return 0;
}

static void
w83781d_init_device(struct device *dev)
{
        struct w83781d_data *data = dev_get_drvdata(dev);
        int i, p;
        int type = data->type;
        u8 tmp;

        if (reset && type != as99127f) { /*
                                          * this resets registers we don't have
                                          * documentation for on the as99127f
                                          */
                /*
                 * Resetting the chip has been the default for a long time,
                 * but it causes the BIOS initializations (fan clock dividers,
                 * thermal sensor types...) to be lost, so it is now optional.
                 * It might even go away if nobody reports it as being useful,
                 * as I see very little reason why this would be needed at
                 * all.
                 */
                dev_info(dev,
                         "If reset=1 solved a problem you were having, please report!\n");

                /* save these registers */
                i = w83781d_read_value(data, W83781D_REG_BEEP_CONFIG);
                p = w83781d_read_value(data, W83781D_REG_PWMCLK12);
                /*
                 * Reset all except Watchdog values and last conversion values
                 * This sets fan-divs to 2, among others
                 */
                w83781d_write_value(data, W83781D_REG_CONFIG, 0x80);
                /*
                 * Restore the registers and disable power-on abnormal beep.
                 * This saves FAN 1/2/3 input/output values set by BIOS.
                 */
                w83781d_write_value(data, W83781D_REG_BEEP_CONFIG, i | 0x80);
                w83781d_write_value(data, W83781D_REG_PWMCLK12, p);
                /*
                 * Disable master beep-enable (reset turns it on).
                 * Individual beep_mask should be reset to off but for some
                 * reason disabling this bit helps some people not get beeped
                 */
                w83781d_write_value(data, W83781D_REG_BEEP_INTS2, 0);
        }

        /*
         * Disable power-on abnormal beep, as advised by the datasheet.
         * Already done if reset=1.
         */
        if (init && !reset && type != as99127f) {
                i = w83781d_read_value(data, W83781D_REG_BEEP_CONFIG);
                w83781d_write_value(data, W83781D_REG_BEEP_CONFIG, i | 0x80);
        }

        data->vrm = vid_which_vrm();

        if ((type != w83781d) && (type != as99127f)) {
                tmp = w83781d_read_value(data, W83781D_REG_SCFG1);
                for (i = 1; i <= 3; i++) {
                        if (!(tmp & BIT_SCFG1[i - 1])) {
                                data->sens[i - 1] = 4;
                        } else {
                                if (w83781d_read_value
                                    (data,
                                     W83781D_REG_SCFG2) & BIT_SCFG2[i - 1])
                                        data->sens[i - 1] = 1;
                                else
                                        data->sens[i - 1] = 2;
                        }
                        if (type == w83783s && i == 2)
                                break;
                }
        }

        if (init && type != as99127f) {
                /* Enable temp2 */
                tmp = w83781d_read_value(data, W83781D_REG_TEMP2_CONFIG);
                if (tmp & 0x01) {
                        dev_warn(dev,
                                 "Enabling temp2, readings might not make sense\n");
                        w83781d_write_value(data, W83781D_REG_TEMP2_CONFIG,
                                tmp & 0xfe);
                }

                /* Enable temp3 */
                if (type != w83783s) {
                        tmp = w83781d_read_value(data,
                                W83781D_REG_TEMP3_CONFIG);
                        if (tmp & 0x01) {
                                dev_warn(dev,
                                         "Enabling temp3, readings might not make sense\n");
                                w83781d_write_value(data,
                                        W83781D_REG_TEMP3_CONFIG, tmp & 0xfe);
                        }
                }
        }

        /* Start monitoring */
        w83781d_write_value(data, W83781D_REG_CONFIG,
                            (w83781d_read_value(data,
                                                W83781D_REG_CONFIG) & 0xf7)
                            | 0x01);

        /* A few vars need to be filled upon startup */
        for (i = 0; i < 3; i++) {
                data->fan_min[i] = w83781d_read_value(data,
                                        W83781D_REG_FAN_MIN(i));
        }

        mutex_init(&data->update_lock);
}

static struct w83781d_data *w83781d_update_device(struct device *dev)
{
        struct w83781d_data *data = dev_get_drvdata(dev);
        struct i2c_client *client = data->client;
        int i;

        mutex_lock(&data->update_lock);

        if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
            || !data->valid) {
                dev_dbg(dev, "Starting device update\n");

                for (i = 0; i <= 8; i++) {
                        if (data->type == w83783s && i == 1)
                                continue;       /* 783S has no in1 */
                        data->in[i] =
                            w83781d_read_value(data, W83781D_REG_IN(i));
                        data->in_min[i] =
                            w83781d_read_value(data, W83781D_REG_IN_MIN(i));
                        data->in_max[i] =
                            w83781d_read_value(data, W83781D_REG_IN_MAX(i));
                        if ((data->type != w83782d) && (i == 6))
                                break;
                }
                for (i = 0; i < 3; i++) {
                        data->fan[i] =
                            w83781d_read_value(data, W83781D_REG_FAN(i));
                        data->fan_min[i] =
                            w83781d_read_value(data, W83781D_REG_FAN_MIN(i));
                }
                if (data->type != w83781d && data->type != as99127f) {
                        for (i = 0; i < 4; i++) {
                                data->pwm[i] =
                                    w83781d_read_value(data,
                                                       W83781D_REG_PWM[i]);
                                /* Only W83782D on SMBus has PWM3 and PWM4 */
                                if ((data->type != w83782d || !client)
                                    && i == 1)
                                        break;
                        }
                        /* Only PWM2 can be disabled */
                        data->pwm2_enable = (w83781d_read_value(data,
                                             W83781D_REG_PWMCLK12) & 0x08) >> 3;
                }

                data->temp = w83781d_read_value(data, W83781D_REG_TEMP(1));
                data->temp_max =
                    w83781d_read_value(data, W83781D_REG_TEMP_OVER(1));
                data->temp_max_hyst =
                    w83781d_read_value(data, W83781D_REG_TEMP_HYST(1));
                data->temp_add[0] =
                    w83781d_read_value(data, W83781D_REG_TEMP(2));
                data->temp_max_add[0] =
                    w83781d_read_value(data, W83781D_REG_TEMP_OVER(2));
                data->temp_max_hyst_add[0] =
                    w83781d_read_value(data, W83781D_REG_TEMP_HYST(2));
                if (data->type != w83783s) {
                        data->temp_add[1] =
                            w83781d_read_value(data, W83781D_REG_TEMP(3));
                        data->temp_max_add[1] =
                            w83781d_read_value(data,
                                               W83781D_REG_TEMP_OVER(3));
                        data->temp_max_hyst_add[1] =
                            w83781d_read_value(data,
                                               W83781D_REG_TEMP_HYST(3));
                }
                i = w83781d_read_value(data, W83781D_REG_VID_FANDIV);
                data->vid = i & 0x0f;
                data->vid |= (w83781d_read_value(data,
                                        W83781D_REG_CHIPID) & 0x01) << 4;
                data->fan_div[0] = (i >> 4) & 0x03;
                data->fan_div[1] = (i >> 6) & 0x03;
                data->fan_div[2] = (w83781d_read_value(data,
                                        W83781D_REG_PIN) >> 6) & 0x03;
                if ((data->type != w83781d) && (data->type != as99127f)) {
                        i = w83781d_read_value(data, W83781D_REG_VBAT);
                        data->fan_div[0] |= (i >> 3) & 0x04;
                        data->fan_div[1] |= (i >> 4) & 0x04;
                        data->fan_div[2] |= (i >> 5) & 0x04;
                }
                if (data->type == w83782d) {
                        data->alarms = w83781d_read_value(data,
                                                W83782D_REG_ALARM1)
                                     | (w83781d_read_value(data,
                                                W83782D_REG_ALARM2) << 8)
                                     | (w83781d_read_value(data,
                                                W83782D_REG_ALARM3) << 16);
                } else if (data->type == w83783s) {
                        data->alarms = w83781d_read_value(data,
                                                W83782D_REG_ALARM1)
                                     | (w83781d_read_value(data,
                                                W83782D_REG_ALARM2) << 8);
                } else {
                        /*
                         * No real-time status registers, fall back to
                         * interrupt status registers
                         */
                        data->alarms = w83781d_read_value(data,
                                                W83781D_REG_ALARM1)
                                     | (w83781d_read_value(data,
                                                W83781D_REG_ALARM2) << 8);
                }
                i = w83781d_read_value(data, W83781D_REG_BEEP_INTS2);
                data->beep_mask = (i << 8) +
                    w83781d_read_value(data, W83781D_REG_BEEP_INTS1);
                if ((data->type != w83781d) && (data->type != as99127f)) {
                        data->beep_mask |=
                            w83781d_read_value(data,
                                               W83781D_REG_BEEP_INTS3) << 16;
                }
                data->last_updated = jiffies;
                data->valid = 1;
        }

        mutex_unlock(&data->update_lock);

        return data;
}

static const struct i2c_device_id w83781d_ids[] = {
        { "w83781d", w83781d, },
        { "w83782d", w83782d, },
        { "w83783s", w83783s, },
        { "as99127f", as99127f },
        { /* LIST END */ }
};
MODULE_DEVICE_TABLE(i2c, w83781d_ids);

static struct i2c_driver w83781d_driver = {
        .class          = I2C_CLASS_HWMON,
        .driver = {
                .name = "w83781d",
        },
        .probe          = w83781d_probe,
        .remove         = w83781d_remove,
        .id_table       = w83781d_ids,
        .detect         = w83781d_detect,
        .address_list   = normal_i2c,
};

/*
 * ISA related code
 */
#ifdef CONFIG_ISA

/* ISA device, if found */
static struct platform_device *pdev;

static unsigned short isa_address = 0x290;

/*
 * I2C devices get this name attribute automatically, but for ISA devices
 * we must create it by ourselves.
 */
static ssize_t
show_name(struct device *dev, struct device_attribute *devattr, char *buf)
{
        struct w83781d_data *data = dev_get_drvdata(dev);
        return sprintf(buf, "%s\n", data->name);
}
static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);

static struct w83781d_data *w83781d_data_if_isa(void)
{
        return pdev ? platform_get_drvdata(pdev) : NULL;
}

/* Returns 1 if the I2C chip appears to be an alias of the ISA chip */
static int w83781d_alias_detect(struct i2c_client *client, u8 chipid)
{
        struct w83781d_data *isa;
        int i;

        if (!pdev)      /* No ISA chip */
                return 0;

        isa = platform_get_drvdata(pdev);

        if (w83781d_read_value(isa, W83781D_REG_I2C_ADDR) != client->addr)
                return 0;       /* Address doesn't match */
        if (w83781d_read_value(isa, W83781D_REG_WCHIPID) != chipid)
                return 0;       /* Chip type doesn't match */

        /*
         * We compare all the limit registers, the config register and the
         * interrupt mask registers
         */
        for (i = 0x2b; i <= 0x3d; i++) {
                if (w83781d_read_value(isa, i) !=
                    i2c_smbus_read_byte_data(client, i))
                        return 0;
        }
        if (w83781d_read_value(isa, W83781D_REG_CONFIG) !=
            i2c_smbus_read_byte_data(client, W83781D_REG_CONFIG))
                return 0;
        for (i = 0x43; i <= 0x46; i++) {
                if (w83781d_read_value(isa, i) !=
                    i2c_smbus_read_byte_data(client, i))
                        return 0;
        }

        return 1;
}

static int
w83781d_read_value_isa(struct w83781d_data *data, u16 reg)
{
        int word_sized, res;

        word_sized = (((reg & 0xff00) == 0x100)
                      || ((reg & 0xff00) == 0x200))
            && (((reg & 0x00ff) == 0x50)
                || ((reg & 0x00ff) == 0x53)
                || ((reg & 0x00ff) == 0x55));
        if (reg & 0xff00) {
                outb_p(W83781D_REG_BANK,
                       data->isa_addr + W83781D_ADDR_REG_OFFSET);
                outb_p(reg >> 8,
                       data->isa_addr + W83781D_DATA_REG_OFFSET);
        }
        outb_p(reg & 0xff, data->isa_addr + W83781D_ADDR_REG_OFFSET);
        res = inb_p(data->isa_addr + W83781D_DATA_REG_OFFSET);
        if (word_sized) {
                outb_p((reg & 0xff) + 1,
                       data->isa_addr + W83781D_ADDR_REG_OFFSET);
                res =
                    (res << 8) + inb_p(data->isa_addr +
                                       W83781D_DATA_REG_OFFSET);
        }
        if (reg & 0xff00) {
                outb_p(W83781D_REG_BANK,
                       data->isa_addr + W83781D_ADDR_REG_OFFSET);
                outb_p(0, data->isa_addr + W83781D_DATA_REG_OFFSET);
        }
        return res;
}

static void
w83781d_write_value_isa(struct w83781d_data *data, u16 reg, u16 value)
{
        int word_sized;

        word_sized = (((reg & 0xff00) == 0x100)
                      || ((reg & 0xff00) == 0x200))
            && (((reg & 0x00ff) == 0x53)
                || ((reg & 0x00ff) == 0x55));
        if (reg & 0xff00) {
                outb_p(W83781D_REG_BANK,
                       data->isa_addr + W83781D_ADDR_REG_OFFSET);
                outb_p(reg >> 8,
                       data->isa_addr + W83781D_DATA_REG_OFFSET);
        }
        outb_p(reg & 0xff, data->isa_addr + W83781D_ADDR_REG_OFFSET);
        if (word_sized) {
                outb_p(value >> 8,
                       data->isa_addr + W83781D_DATA_REG_OFFSET);
                outb_p((reg & 0xff) + 1,
                       data->isa_addr + W83781D_ADDR_REG_OFFSET);
        }
        outb_p(value & 0xff, data->isa_addr + W83781D_DATA_REG_OFFSET);
        if (reg & 0xff00) {
                outb_p(W83781D_REG_BANK,
                       data->isa_addr + W83781D_ADDR_REG_OFFSET);
                outb_p(0, data->isa_addr + W83781D_DATA_REG_OFFSET);
        }
}

/*
 * The SMBus locks itself, usually, but nothing may access the Winbond between
 * bank switches. ISA access must always be locked explicitly!
 * We ignore the W83781D BUSY flag at this moment - it could lead to deadlocks,
 * would slow down the W83781D access and should not be necessary.
 * There are some ugly typecasts here, but the good news is - they should
 * nowhere else be necessary!
 */
static int
w83781d_read_value(struct w83781d_data *data, u16 reg)
{
        struct i2c_client *client = data->client;
        int res;

        mutex_lock(&data->lock);
        if (client)
                res = w83781d_read_value_i2c(data, reg);
        else
                res = w83781d_read_value_isa(data, reg);
        mutex_unlock(&data->lock);
        return res;
}

static int
w83781d_write_value(struct w83781d_data *data, u16 reg, u16 value)
{
        struct i2c_client *client = data->client;

        mutex_lock(&data->lock);
        if (client)
                w83781d_write_value_i2c(data, reg, value);
        else
                w83781d_write_value_isa(data, reg, value);
        mutex_unlock(&data->lock);
        return 0;
}

static int
w83781d_isa_probe(struct platform_device *pdev)
{
        int err, reg;
        struct w83781d_data *data;
        struct resource *res;

        /* Reserve the ISA region */
        res = platform_get_resource(pdev, IORESOURCE_IO, 0);
        if (!devm_request_region(&pdev->dev,
                                 res->start + W83781D_ADDR_REG_OFFSET, 2,
                                 "w83781d"))
                return -EBUSY;

        data = devm_kzalloc(&pdev->dev, sizeof(struct w83781d_data),
                            GFP_KERNEL);
        if (!data)
                return -ENOMEM;

        mutex_init(&data->lock);
        data->isa_addr = res->start;
        platform_set_drvdata(pdev, data);

        reg = w83781d_read_value(data, W83781D_REG_WCHIPID);
        switch (reg) {
        case 0x30:
                data->type = w83782d;
                data->name = "w83782d";
                break;
        default:
                data->type = w83781d;
                data->name = "w83781d";
        }

        /* Initialize the W83781D chip */
        w83781d_init_device(&pdev->dev);

        /* Register sysfs hooks */
        err = w83781d_create_files(&pdev->dev, data->type, 1);
        if (err)
                goto exit_remove_files;

        err = device_create_file(&pdev->dev, &dev_attr_name);
        if (err)
                goto exit_remove_files;

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

        return 0;

 exit_remove_files:
        w83781d_remove_files(&pdev->dev);
        device_remove_file(&pdev->dev, &dev_attr_name);
        return err;
}

static int
w83781d_isa_remove(struct platform_device *pdev)
{
        struct w83781d_data *data = platform_get_drvdata(pdev);

        hwmon_device_unregister(data->hwmon_dev);
        w83781d_remove_files(&pdev->dev);
        device_remove_file(&pdev->dev, &dev_attr_name);

        return 0;
}

static struct platform_driver w83781d_isa_driver = {
        .driver = {
                .name = "w83781d",
        },
        .probe = w83781d_isa_probe,
        .remove = w83781d_isa_remove,
};

/* return 1 if a supported chip is found, 0 otherwise */
static int __init
w83781d_isa_found(unsigned short address)
{
        int val, save, found = 0;
        int port;

        /*
         * Some boards declare base+0 to base+7 as a PNP device, some base+4
         * to base+7 and some base+5 to base+6. So we better request each port
         * individually for the probing phase.
         */
        for (port = address; port < address + W83781D_EXTENT; port++) {
                if (!request_region(port, 1, "w83781d")) {
                        pr_debug("Failed to request port 0x%x\n", port);
                        goto release;
                }
        }

#define REALLY_SLOW_IO
        /*
         * We need the timeouts for at least some W83781D-like
         * chips. But only if we read 'undefined' registers.
         */
        val = inb_p(address + 1);
        if (inb_p(address + 2) != val
         || inb_p(address + 3) != val
         || inb_p(address + 7) != val) {
                pr_debug("Detection failed at step %d\n", 1);
                goto release;
        }
#undef REALLY_SLOW_IO

        /*
         * We should be able to change the 7 LSB of the address port. The
         * MSB (busy flag) should be clear initially, set after the write.
         */
        save = inb_p(address + W83781D_ADDR_REG_OFFSET);
        if (save & 0x80) {
                pr_debug("Detection failed at step %d\n", 2);
                goto release;
        }
        val = ~save & 0x7f;
        outb_p(val, address + W83781D_ADDR_REG_OFFSET);
        if (inb_p(address + W83781D_ADDR_REG_OFFSET) != (val | 0x80)) {
                outb_p(save, address + W83781D_ADDR_REG_OFFSET);
                pr_debug("Detection failed at step %d\n", 3);
                goto release;
        }

        /* We found a device, now see if it could be a W83781D */
        outb_p(W83781D_REG_CONFIG, address + W83781D_ADDR_REG_OFFSET);
        val = inb_p(address + W83781D_DATA_REG_OFFSET);
        if (val & 0x80) {
                pr_debug("Detection failed at step %d\n", 4);
                goto release;
        }
        outb_p(W83781D_REG_BANK, address + W83781D_ADDR_REG_OFFSET);
        save = inb_p(address + W83781D_DATA_REG_OFFSET);
        outb_p(W83781D_REG_CHIPMAN, address + W83781D_ADDR_REG_OFFSET);
        val = inb_p(address + W83781D_DATA_REG_OFFSET);
        if ((!(save & 0x80) && (val != 0xa3))
         || ((save & 0x80) && (val != 0x5c))) {
                pr_debug("Detection failed at step %d\n", 5);
                goto release;
        }
        outb_p(W83781D_REG_I2C_ADDR, address + W83781D_ADDR_REG_OFFSET);
        val = inb_p(address + W83781D_DATA_REG_OFFSET);
        if (val < 0x03 || val > 0x77) { /* Not a valid I2C address */
                pr_debug("Detection failed at step %d\n", 6);
                goto release;
        }

        /* The busy flag should be clear again */
        if (inb_p(address + W83781D_ADDR_REG_OFFSET) & 0x80) {
                pr_debug("Detection failed at step %d\n", 7);
                goto release;
        }

        /* Determine the chip type */
        outb_p(W83781D_REG_BANK, address + W83781D_ADDR_REG_OFFSET);
        save = inb_p(address + W83781D_DATA_REG_OFFSET);
        outb_p(save & 0xf8, address + W83781D_DATA_REG_OFFSET);
        outb_p(W83781D_REG_WCHIPID, address + W83781D_ADDR_REG_OFFSET);
        val = inb_p(address + W83781D_DATA_REG_OFFSET);
        if ((val & 0xfe) == 0x10        /* W83781D */
         || val == 0x30)                /* W83782D */
                found = 1;

        if (found)
                pr_info("Found a %s chip at %#x\n",
                        val == 0x30 ? "W83782D" : "W83781D", (int)address);

 release:
        for (port--; port >= address; port--)
                release_region(port, 1);
        return found;
}

static int __init
w83781d_isa_device_add(unsigned short address)
{
        struct resource res = {
                .start  = address,
                .end    = address + W83781D_EXTENT - 1,
                .name   = "w83781d",
                .flags  = IORESOURCE_IO,
        };
        int err;

        pdev = platform_device_alloc("w83781d", address);
        if (!pdev) {
                err = -ENOMEM;
                pr_err("Device allocation failed\n");
                goto exit;
        }

        err = platform_device_add_resources(pdev, &res, 1);
        if (err) {
                pr_err("Device resource addition failed (%d)\n", err);
                goto exit_device_put;
        }

        err = platform_device_add(pdev);
        if (err) {
                pr_err("Device addition failed (%d)\n", err);
                goto exit_device_put;
        }

        return 0;

 exit_device_put:
        platform_device_put(pdev);
 exit:
        pdev = NULL;
        return err;
}

static int __init
w83781d_isa_register(void)
{
        int res;

        if (w83781d_isa_found(isa_address)) {
                res = platform_driver_register(&w83781d_isa_driver);
                if (res)
                        goto exit;

                /* Sets global pdev as a side effect */
                res = w83781d_isa_device_add(isa_address);
                if (res)
                        goto exit_unreg_isa_driver;
        }

        return 0;

exit_unreg_isa_driver:
        platform_driver_unregister(&w83781d_isa_driver);
exit:
        return res;
}

static void
w83781d_isa_unregister(void)
{
        if (pdev) {
                platform_device_unregister(pdev);
                platform_driver_unregister(&w83781d_isa_driver);
        }
}
#else /* !CONFIG_ISA */

static struct w83781d_data *w83781d_data_if_isa(void)
{
        return NULL;
}

static int
w83781d_alias_detect(struct i2c_client *client, u8 chipid)
{
        return 0;
}

static int
w83781d_read_value(struct w83781d_data *data, u16 reg)
{
        int res;

        mutex_lock(&data->lock);
        res = w83781d_read_value_i2c(data, reg);
        mutex_unlock(&data->lock);

        return res;
}

static int
w83781d_write_value(struct w83781d_data *data, u16 reg, u16 value)
{
        mutex_lock(&data->lock);
        w83781d_write_value_i2c(data, reg, value);
        mutex_unlock(&data->lock);

        return 0;
}

static int __init
w83781d_isa_register(void)
{
        return 0;
}

static void
w83781d_isa_unregister(void)
{
}
#endif /* CONFIG_ISA */

static int __init
sensors_w83781d_init(void)
{
        int res;

        /*
         * We register the ISA device first, so that we can skip the
         * registration of an I2C interface to the same device.
         */
        res = w83781d_isa_register();
        if (res)
                goto exit;

        res = i2c_add_driver(&w83781d_driver);
        if (res)
                goto exit_unreg_isa;

        return 0;

 exit_unreg_isa:
        w83781d_isa_unregister();
 exit:
        return res;
}

static void __exit
sensors_w83781d_exit(void)
{
        w83781d_isa_unregister();
        i2c_del_driver(&w83781d_driver);
}

MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
              "Philip Edelbrock <phil@netroedge.com>, "
              "and Mark Studebaker <mdsxyz123@yahoo.com>");
MODULE_DESCRIPTION("W83781D driver");
MODULE_LICENSE("GPL");

module_init(sensors_w83781d_init);
module_exit(sensors_w83781d_exit);