/*
 * adt7475 - Thermal sensor driver for the ADT7475 chip and derivatives
 * Copyright (C) 2007-2008, Advanced Micro Devices, Inc.
 * Copyright (C) 2008 Jordan Crouse <jordan@cosmicpenguin.net>
 * Copyright (C) 2008 Hans de Goede <hdegoede@redhat.com>
 * Copyright (C) 2009 Jean Delvare <khali@linux-fr.org>
 *
 * Derived from the lm83 driver by Jean Delvare
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#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/hwmon-vid.h>
#include <linux/err.h>
#include <linux/jiffies.h>

/* Indexes for the sysfs hooks */

#define INPUT           0
#define MIN             1
#define MAX             2
#define CONTROL         3
#define OFFSET          3
#define AUTOMIN         4
#define THERM           5
#define HYSTERSIS       6

/*
 * These are unique identifiers for the sysfs functions - unlike the
 * numbers above, these are not also indexes into an array
 */

#define ALARM           9
#define FAULT           10

/* 7475 Common Registers */

#define REG_DEVREV2             0x12    /* ADT7490 only */

#define REG_VTT                 0x1E    /* ADT7490 only */
#define REG_EXTEND3             0x1F    /* ADT7490 only */

#define REG_VOLTAGE_BASE        0x20
#define REG_TEMP_BASE           0x25
#define REG_TACH_BASE           0x28
#define REG_PWM_BASE            0x30
#define REG_PWM_MAX_BASE        0x38

#define REG_DEVID               0x3D
#define REG_VENDID              0x3E
#define REG_DEVID2              0x3F

#define REG_STATUS1             0x41
#define REG_STATUS2             0x42

#define REG_VID                 0x43    /* ADT7476 only */

#define REG_VOLTAGE_MIN_BASE    0x44
#define REG_VOLTAGE_MAX_BASE    0x45

#define REG_TEMP_MIN_BASE       0x4E
#define REG_TEMP_MAX_BASE       0x4F

#define REG_TACH_MIN_BASE       0x54

#define REG_PWM_CONFIG_BASE     0x5C

#define REG_TEMP_TRANGE_BASE    0x5F

#define REG_PWM_MIN_BASE        0x64

#define REG_TEMP_TMIN_BASE      0x67
#define REG_TEMP_THERM_BASE     0x6A

#define REG_REMOTE1_HYSTERSIS   0x6D
#define REG_REMOTE2_HYSTERSIS   0x6E

#define REG_TEMP_OFFSET_BASE    0x70

#define REG_CONFIG2             0x73

#define REG_EXTEND1             0x76
#define REG_EXTEND2             0x77

#define REG_CONFIG3             0x78
#define REG_CONFIG5             0x7C
#define REG_CONFIG4             0x7D

#define REG_STATUS4             0x81    /* ADT7490 only */

#define REG_VTT_MIN             0x84    /* ADT7490 only */
#define REG_VTT_MAX             0x86    /* ADT7490 only */

#define VID_VIDSEL              0x80    /* ADT7476 only */

#define CONFIG2_ATTN            0x20

#define CONFIG3_SMBALERT        0x01
#define CONFIG3_THERM           0x02

#define CONFIG4_PINFUNC         0x03
#define CONFIG4_MAXDUTY         0x08
#define CONFIG4_ATTN_IN10       0x30
#define CONFIG4_ATTN_IN43       0xC0

#define CONFIG5_TWOSCOMP        0x01
#define CONFIG5_TEMPOFFSET      0x02
#define CONFIG5_VIDGPIO         0x10    /* ADT7476 only */

/* ADT7475 Settings */

#define ADT7475_VOLTAGE_COUNT   5       /* Not counting Vtt */
#define ADT7475_TEMP_COUNT      3
#define ADT7475_TACH_COUNT      4
#define ADT7475_PWM_COUNT       3

/* Macro to read the registers */

#define adt7475_read(reg) i2c_smbus_read_byte_data(client, (reg))

/* Macros to easily index the registers */

#define TACH_REG(idx) (REG_TACH_BASE + ((idx) * 2))
#define TACH_MIN_REG(idx) (REG_TACH_MIN_BASE + ((idx) * 2))

#define PWM_REG(idx) (REG_PWM_BASE + (idx))
#define PWM_MAX_REG(idx) (REG_PWM_MAX_BASE + (idx))
#define PWM_MIN_REG(idx) (REG_PWM_MIN_BASE + (idx))
#define PWM_CONFIG_REG(idx) (REG_PWM_CONFIG_BASE + (idx))

#define VOLTAGE_REG(idx) (REG_VOLTAGE_BASE + (idx))
#define VOLTAGE_MIN_REG(idx) (REG_VOLTAGE_MIN_BASE + ((idx) * 2))
#define VOLTAGE_MAX_REG(idx) (REG_VOLTAGE_MAX_BASE + ((idx) * 2))

#define TEMP_REG(idx) (REG_TEMP_BASE + (idx))
#define TEMP_MIN_REG(idx) (REG_TEMP_MIN_BASE + ((idx) * 2))
#define TEMP_MAX_REG(idx) (REG_TEMP_MAX_BASE + ((idx) * 2))
#define TEMP_TMIN_REG(idx) (REG_TEMP_TMIN_BASE + (idx))
#define TEMP_THERM_REG(idx) (REG_TEMP_THERM_BASE + (idx))
#define TEMP_OFFSET_REG(idx) (REG_TEMP_OFFSET_BASE + (idx))
#define TEMP_TRANGE_REG(idx) (REG_TEMP_TRANGE_BASE + (idx))

static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };

enum chips { adt7473, adt7475, adt7476, adt7490 };

static const struct i2c_device_id adt7475_id[] = {
        { "adt7473", adt7473 },
        { "adt7475", adt7475 },
        { "adt7476", adt7476 },
        { "adt7490", adt7490 },
        { }
};
MODULE_DEVICE_TABLE(i2c, adt7475_id);

struct adt7475_data {
        struct device *hwmon_dev;
        struct mutex lock;

        unsigned long measure_updated;
        unsigned long limits_updated;
        char valid;

        u8 config4;
        u8 config5;
        u8 has_voltage;
        u8 bypass_attn;         /* Bypass voltage attenuator */
        u8 has_pwm2:1;
        u8 has_fan4:1;
        u8 has_vid:1;
        u32 alarms;
        u16 voltage[3][6];
        u16 temp[7][3];
        u16 tach[2][4];
        u8 pwm[4][3];
        u8 range[3];
        u8 pwmctl[3];
        u8 pwmchan[3];

        u8 vid;
        u8 vrm;
};

static struct i2c_driver adt7475_driver;
static struct adt7475_data *adt7475_update_device(struct device *dev);
static void adt7475_read_hystersis(struct i2c_client *client);
static void adt7475_read_pwm(struct i2c_client *client, int index);

/* Given a temp value, convert it to register value */

static inline u16 temp2reg(struct adt7475_data *data, long val)
{
        u16 ret;

        if (!(data->config5 & CONFIG5_TWOSCOMP)) {
                val = clamp_val(val, -64000, 191000);
                ret = (val + 64500) / 1000;
        } else {
                val = clamp_val(val, -128000, 127000);
                if (val < -500)
                        ret = (256500 + val) / 1000;
                else
                        ret = (val + 500) / 1000;
        }

        return ret << 2;
}

/* Given a register value, convert it to a real temp value */

static inline int reg2temp(struct adt7475_data *data, u16 reg)
{
        if (data->config5 & CONFIG5_TWOSCOMP) {
                if (reg >= 512)
                        return (reg - 1024) * 250;
                else
                        return reg * 250;
        } else
                return (reg - 256) * 250;
}

static inline int tach2rpm(u16 tach)
{
        if (tach == 0 || tach == 0xFFFF)
                return 0;

        return (90000 * 60) / tach;
}

static inline u16 rpm2tach(unsigned long rpm)
{
        if (rpm == 0)
                return 0;

        return clamp_val((90000 * 60) / rpm, 1, 0xFFFF);
}

/* Scaling factors for voltage inputs, taken from the ADT7490 datasheet */
static const int adt7473_in_scaling[ADT7475_VOLTAGE_COUNT + 1][2] = {
        { 45, 94 },     /* +2.5V */
        { 175, 525 },   /* Vccp */
        { 68, 71 },     /* Vcc */
        { 93, 47 },     /* +5V */
        { 120, 20 },    /* +12V */
        { 45, 45 },     /* Vtt */
};

static inline int reg2volt(int channel, u16 reg, u8 bypass_attn)
{
        const int *r = adt7473_in_scaling[channel];

        if (bypass_attn & (1 << channel))
                return DIV_ROUND_CLOSEST(reg * 2250, 1024);
        return DIV_ROUND_CLOSEST(reg * (r[0] + r[1]) * 2250, r[1] * 1024);
}

static inline u16 volt2reg(int channel, long volt, u8 bypass_attn)
{
        const int *r = adt7473_in_scaling[channel];
        long reg;

        if (bypass_attn & (1 << channel))
                reg = (volt * 1024) / 2250;
        else
                reg = (volt * r[1] * 1024) / ((r[0] + r[1]) * 2250);
        return clamp_val(reg, 0, 1023) & (0xff << 2);
}

static u16 adt7475_read_word(struct i2c_client *client, int reg)
{
        u16 val;

        val = i2c_smbus_read_byte_data(client, reg);
        val |= (i2c_smbus_read_byte_data(client, reg + 1) << 8);

        return val;
}

static void adt7475_write_word(struct i2c_client *client, int reg, u16 val)
{
        i2c_smbus_write_byte_data(client, reg + 1, val >> 8);
        i2c_smbus_write_byte_data(client, reg, val & 0xFF);
}

/*
 * Find the nearest value in a table - used for pwm frequency and
 * auto temp range
 */
static int find_nearest(long val, const int *array, int size)
{
        int i;

        if (val < array[0])
                return 0;

        if (val > array[size - 1])
                return size - 1;

        for (i = 0; i < size - 1; i++) {
                int a, b;

                if (val > array[i + 1])
                        continue;

                a = val - array[i];
                b = array[i + 1] - val;

                return (a <= b) ? i : i + 1;
        }

        return 0;
}

static ssize_t show_voltage(struct device *dev, struct device_attribute *attr,
                            char *buf)
{
        struct adt7475_data *data = adt7475_update_device(dev);
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        unsigned short val;

        switch (sattr->nr) {
        case ALARM:
                return sprintf(buf, "%d\n",
                               (data->alarms >> sattr->index) & 1);
        default:
                val = data->voltage[sattr->nr][sattr->index];
                return sprintf(buf, "%d\n",
                               reg2volt(sattr->index, val, data->bypass_attn));
        }
}

static ssize_t set_voltage(struct device *dev, struct device_attribute *attr,
                           const char *buf, size_t count)
{

        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        struct i2c_client *client = to_i2c_client(dev);
        struct adt7475_data *data = i2c_get_clientdata(client);
        unsigned char reg;
        long val;

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

        mutex_lock(&data->lock);

        data->voltage[sattr->nr][sattr->index] =
                                volt2reg(sattr->index, val, data->bypass_attn);

        if (sattr->index < ADT7475_VOLTAGE_COUNT) {
                if (sattr->nr == MIN)
                        reg = VOLTAGE_MIN_REG(sattr->index);
                else
                        reg = VOLTAGE_MAX_REG(sattr->index);
        } else {
                if (sattr->nr == MIN)
                        reg = REG_VTT_MIN;
                else
                        reg = REG_VTT_MAX;
        }

        i2c_smbus_write_byte_data(client, reg,
                                  data->voltage[sattr->nr][sattr->index] >> 2);
        mutex_unlock(&data->lock);

        return count;
}

static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
                         char *buf)
{
        struct adt7475_data *data = adt7475_update_device(dev);
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        int out;

        switch (sattr->nr) {
        case HYSTERSIS:
                mutex_lock(&data->lock);
                out = data->temp[sattr->nr][sattr->index];
                if (sattr->index != 1)
                        out = (out >> 4) & 0xF;
                else
                        out = (out & 0xF);
                /*
                 * Show the value as an absolute number tied to
                 * THERM
                 */
                out = reg2temp(data, data->temp[THERM][sattr->index]) -
                        out * 1000;
                mutex_unlock(&data->lock);
                break;

        case OFFSET:
                /*
                 * Offset is always 2's complement, regardless of the
                 * setting in CONFIG5
                 */
                mutex_lock(&data->lock);
                out = (s8)data->temp[sattr->nr][sattr->index];
                if (data->config5 & CONFIG5_TEMPOFFSET)
                        out *= 1000;
                else
                        out *= 500;
                mutex_unlock(&data->lock);
                break;

        case ALARM:
                out = (data->alarms >> (sattr->index + 4)) & 1;
                break;

        case FAULT:
                /* Note - only for remote1 and remote2 */
                out = !!(data->alarms & (sattr->index ? 0x8000 : 0x4000));
                break;

        default:
                /* All other temp values are in the configured format */
                out = reg2temp(data, data->temp[sattr->nr][sattr->index]);
        }

        return sprintf(buf, "%d\n", out);
}

static ssize_t set_temp(struct device *dev, struct device_attribute *attr,
                        const char *buf, size_t count)
{
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        struct i2c_client *client = to_i2c_client(dev);
        struct adt7475_data *data = i2c_get_clientdata(client);
        unsigned char reg = 0;
        u8 out;
        int temp;
        long val;

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

        mutex_lock(&data->lock);

        /* We need the config register in all cases for temp <-> reg conv. */
        data->config5 = adt7475_read(REG_CONFIG5);

        switch (sattr->nr) {
        case OFFSET:
                if (data->config5 & CONFIG5_TEMPOFFSET) {
                        val = clamp_val(val, -63000, 127000);
                        out = data->temp[OFFSET][sattr->index] = val / 1000;
                } else {
                        val = clamp_val(val, -63000, 64000);
                        out = data->temp[OFFSET][sattr->index] = val / 500;
                }
                break;

        case HYSTERSIS:
                /*
                 * The value will be given as an absolute value, turn it
                 * into an offset based on THERM
                 */

                /* Read fresh THERM and HYSTERSIS values from the chip */
                data->temp[THERM][sattr->index] =
                        adt7475_read(TEMP_THERM_REG(sattr->index)) << 2;
                adt7475_read_hystersis(client);

                temp = reg2temp(data, data->temp[THERM][sattr->index]);
                val = clamp_val(val, temp - 15000, temp);
                val = (temp - val) / 1000;

                if (sattr->index != 1) {
                        data->temp[HYSTERSIS][sattr->index] &= 0xF0;
                        data->temp[HYSTERSIS][sattr->index] |= (val & 0xF) << 4;
                } else {
                        data->temp[HYSTERSIS][sattr->index] &= 0x0F;
                        data->temp[HYSTERSIS][sattr->index] |= (val & 0xF);
                }

                out = data->temp[HYSTERSIS][sattr->index];
                break;

        default:
                data->temp[sattr->nr][sattr->index] = temp2reg(data, val);

                /*
                 * We maintain an extra 2 digits of precision for simplicity
                 * - shift those back off before writing the value
                 */
                out = (u8) (data->temp[sattr->nr][sattr->index] >> 2);
        }

        switch (sattr->nr) {
        case MIN:
                reg = TEMP_MIN_REG(sattr->index);
                break;
        case MAX:
                reg = TEMP_MAX_REG(sattr->index);
                break;
        case OFFSET:
                reg = TEMP_OFFSET_REG(sattr->index);
                break;
        case AUTOMIN:
                reg = TEMP_TMIN_REG(sattr->index);
                break;
        case THERM:
                reg = TEMP_THERM_REG(sattr->index);
                break;
        case HYSTERSIS:
                if (sattr->index != 2)
                        reg = REG_REMOTE1_HYSTERSIS;
                else
                        reg = REG_REMOTE2_HYSTERSIS;

                break;
        }

        i2c_smbus_write_byte_data(client, reg, out);

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

/*
 * Table of autorange values - the user will write the value in millidegrees,
 * and we'll convert it
 */
static const int autorange_table[] = {
        2000, 2500, 3330, 4000, 5000, 6670, 8000,
        10000, 13330, 16000, 20000, 26670, 32000, 40000,
        53330, 80000
};

static ssize_t show_point2(struct device *dev, struct device_attribute *attr,
                           char *buf)
{
        struct adt7475_data *data = adt7475_update_device(dev);
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        int out, val;

        mutex_lock(&data->lock);
        out = (data->range[sattr->index] >> 4) & 0x0F;
        val = reg2temp(data, data->temp[AUTOMIN][sattr->index]);
        mutex_unlock(&data->lock);

        return sprintf(buf, "%d\n", val + autorange_table[out]);
}

static ssize_t set_point2(struct device *dev, struct device_attribute *attr,
                          const char *buf, size_t count)
{
        struct i2c_client *client = to_i2c_client(dev);
        struct adt7475_data *data = i2c_get_clientdata(client);
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        int temp;
        long val;

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

        mutex_lock(&data->lock);

        /* Get a fresh copy of the needed registers */
        data->config5 = adt7475_read(REG_CONFIG5);
        data->temp[AUTOMIN][sattr->index] =
                adt7475_read(TEMP_TMIN_REG(sattr->index)) << 2;
        data->range[sattr->index] =
                adt7475_read(TEMP_TRANGE_REG(sattr->index));

        /*
         * The user will write an absolute value, so subtract the start point
         * to figure the range
         */
        temp = reg2temp(data, data->temp[AUTOMIN][sattr->index]);
        val = clamp_val(val, temp + autorange_table[0],
                temp + autorange_table[ARRAY_SIZE(autorange_table) - 1]);
        val -= temp;

        /* Find the nearest table entry to what the user wrote */
        val = find_nearest(val, autorange_table, ARRAY_SIZE(autorange_table));

        data->range[sattr->index] &= ~0xF0;
        data->range[sattr->index] |= val << 4;

        i2c_smbus_write_byte_data(client, TEMP_TRANGE_REG(sattr->index),
                                  data->range[sattr->index]);

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

static ssize_t show_tach(struct device *dev, struct device_attribute *attr,
                         char *buf)
{
        struct adt7475_data *data = adt7475_update_device(dev);
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        int out;

        if (sattr->nr == ALARM)
                out = (data->alarms >> (sattr->index + 10)) & 1;
        else
                out = tach2rpm(data->tach[sattr->nr][sattr->index]);

        return sprintf(buf, "%d\n", out);
}

static ssize_t set_tach(struct device *dev, struct device_attribute *attr,
                        const char *buf, size_t count)
{

        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        struct i2c_client *client = to_i2c_client(dev);
        struct adt7475_data *data = i2c_get_clientdata(client);
        unsigned long val;

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

        mutex_lock(&data->lock);

        data->tach[MIN][sattr->index] = rpm2tach(val);

        adt7475_write_word(client, TACH_MIN_REG(sattr->index),
                           data->tach[MIN][sattr->index]);

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

static ssize_t show_pwm(struct device *dev, struct device_attribute *attr,
                        char *buf)
{
        struct adt7475_data *data = adt7475_update_device(dev);
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);

        return sprintf(buf, "%d\n", data->pwm[sattr->nr][sattr->index]);
}

static ssize_t show_pwmchan(struct device *dev, struct device_attribute *attr,
                            char *buf)
{
        struct adt7475_data *data = adt7475_update_device(dev);
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);

        return sprintf(buf, "%d\n", data->pwmchan[sattr->index]);
}

static ssize_t show_pwmctrl(struct device *dev, struct device_attribute *attr,
                            char *buf)
{
        struct adt7475_data *data = adt7475_update_device(dev);
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);

        return sprintf(buf, "%d\n", data->pwmctl[sattr->index]);
}

static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
                       const char *buf, size_t count)
{

        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        struct i2c_client *client = to_i2c_client(dev);
        struct adt7475_data *data = i2c_get_clientdata(client);
        unsigned char reg = 0;
        long val;

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

        mutex_lock(&data->lock);

        switch (sattr->nr) {
        case INPUT:
                /* Get a fresh value for CONTROL */
                data->pwm[CONTROL][sattr->index] =
                        adt7475_read(PWM_CONFIG_REG(sattr->index));

                /*
                 * If we are not in manual mode, then we shouldn't allow
                 * the user to set the pwm speed
                 */
                if (((data->pwm[CONTROL][sattr->index] >> 5) & 7) != 7) {
                        mutex_unlock(&data->lock);
                        return count;
                }

                reg = PWM_REG(sattr->index);
                break;

        case MIN:
                reg = PWM_MIN_REG(sattr->index);
                break;

        case MAX:
                reg = PWM_MAX_REG(sattr->index);
                break;
        }

        data->pwm[sattr->nr][sattr->index] = clamp_val(val, 0, 0xFF);
        i2c_smbus_write_byte_data(client, reg,
                                  data->pwm[sattr->nr][sattr->index]);

        mutex_unlock(&data->lock);

        return count;
}

/* Called by set_pwmctrl and set_pwmchan */

static int hw_set_pwm(struct i2c_client *client, int index,
                      unsigned int pwmctl, unsigned int pwmchan)
{
        struct adt7475_data *data = i2c_get_clientdata(client);
        long val = 0;

        switch (pwmctl) {
        case 0:
                val = 0x03;     /* Run at full speed */
                break;
        case 1:
                val = 0x07;     /* Manual mode */
                break;
        case 2:
                switch (pwmchan) {
                case 1:
                        /* Remote1 controls PWM */
                        val = 0x00;
                        break;
                case 2:
                        /* local controls PWM */
                        val = 0x01;
                        break;
                case 4:
                        /* remote2 controls PWM */
                        val = 0x02;
                        break;
                case 6:
                        /* local/remote2 control PWM */
                        val = 0x05;
                        break;
                case 7:
                        /* All three control PWM */
                        val = 0x06;
                        break;
                default:
                        return -EINVAL;
                }
                break;
        default:
                return -EINVAL;
        }

        data->pwmctl[index] = pwmctl;
        data->pwmchan[index] = pwmchan;

        data->pwm[CONTROL][index] &= ~0xE0;
        data->pwm[CONTROL][index] |= (val & 7) << 5;

        i2c_smbus_write_byte_data(client, PWM_CONFIG_REG(index),
                                  data->pwm[CONTROL][index]);

        return 0;
}

static ssize_t set_pwmchan(struct device *dev, struct device_attribute *attr,
                           const char *buf, size_t count)
{
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        struct i2c_client *client = to_i2c_client(dev);
        struct adt7475_data *data = i2c_get_clientdata(client);
        int r;
        long val;

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

        mutex_lock(&data->lock);
        /* Read Modify Write PWM values */
        adt7475_read_pwm(client, sattr->index);
        r = hw_set_pwm(client, sattr->index, data->pwmctl[sattr->index], val);
        if (r)
                count = r;
        mutex_unlock(&data->lock);

        return count;
}

static ssize_t set_pwmctrl(struct device *dev, struct device_attribute *attr,
                           const char *buf, size_t count)
{
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        struct i2c_client *client = to_i2c_client(dev);
        struct adt7475_data *data = i2c_get_clientdata(client);
        int r;
        long val;

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

        mutex_lock(&data->lock);
        /* Read Modify Write PWM values */
        adt7475_read_pwm(client, sattr->index);
        r = hw_set_pwm(client, sattr->index, val, data->pwmchan[sattr->index]);
        if (r)
                count = r;
        mutex_unlock(&data->lock);

        return count;
}

/* List of frequencies for the PWM */
static const int pwmfreq_table[] = {
        11, 14, 22, 29, 35, 44, 58, 88
};

static ssize_t show_pwmfreq(struct device *dev, struct device_attribute *attr,
                            char *buf)
{
        struct adt7475_data *data = adt7475_update_device(dev);
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);

        return sprintf(buf, "%d\n",
                       pwmfreq_table[data->range[sattr->index] & 7]);
}

static ssize_t set_pwmfreq(struct device *dev, struct device_attribute *attr,
                           const char *buf, size_t count)
{
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        struct i2c_client *client = to_i2c_client(dev);
        struct adt7475_data *data = i2c_get_clientdata(client);
        int out;
        long val;

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

        out = find_nearest(val, pwmfreq_table, ARRAY_SIZE(pwmfreq_table));

        mutex_lock(&data->lock);

        data->range[sattr->index] =
                adt7475_read(TEMP_TRANGE_REG(sattr->index));
        data->range[sattr->index] &= ~7;
        data->range[sattr->index] |= out;

        i2c_smbus_write_byte_data(client, TEMP_TRANGE_REG(sattr->index),
                                  data->range[sattr->index]);

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

static ssize_t show_pwm_at_crit(struct device *dev,
                                struct device_attribute *devattr, char *buf)
{
        struct adt7475_data *data = adt7475_update_device(dev);
        return sprintf(buf, "%d\n", !!(data->config4 & CONFIG4_MAXDUTY));
}

static ssize_t set_pwm_at_crit(struct device *dev,
                               struct device_attribute *devattr,
                               const char *buf, size_t count)
{
        struct i2c_client *client = to_i2c_client(dev);
        struct adt7475_data *data = i2c_get_clientdata(client);
        long val;

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

        mutex_lock(&data->lock);
        data->config4 = i2c_smbus_read_byte_data(client, REG_CONFIG4);
        if (val)
                data->config4 |= CONFIG4_MAXDUTY;
        else
                data->config4 &= ~CONFIG4_MAXDUTY;
        i2c_smbus_write_byte_data(client, REG_CONFIG4, data->config4);
        mutex_unlock(&data->lock);

        return count;
}

static ssize_t show_vrm(struct device *dev, struct device_attribute *devattr,
                        char *buf)
{
        struct adt7475_data *data = dev_get_drvdata(dev);
        return sprintf(buf, "%d\n", (int)data->vrm);
}

static ssize_t set_vrm(struct device *dev, struct device_attribute *devattr,
                       const char *buf, size_t count)
{
        struct adt7475_data *data = dev_get_drvdata(dev);
        long val;

        if (kstrtol(buf, 10, &val))
                return -EINVAL;
        if (val < 0 || val > 255)
                return -EINVAL;
        data->vrm = val;

        return count;
}

static ssize_t show_vid(struct device *dev, struct device_attribute *devattr,
                        char *buf)
{
        struct adt7475_data *data = adt7475_update_device(dev);
        return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
}

static SENSOR_DEVICE_ATTR_2(in0_input, S_IRUGO, show_voltage, NULL, INPUT, 0);
static SENSOR_DEVICE_ATTR_2(in0_max, S_IRUGO | S_IWUSR, show_voltage,
                            set_voltage, MAX, 0);
static SENSOR_DEVICE_ATTR_2(in0_min, S_IRUGO | S_IWUSR, show_voltage,
                            set_voltage, MIN, 0);
static SENSOR_DEVICE_ATTR_2(in0_alarm, S_IRUGO, show_voltage, NULL, ALARM, 0);
static SENSOR_DEVICE_ATTR_2(in1_input, S_IRUGO, show_voltage, NULL, INPUT, 1);
static SENSOR_DEVICE_ATTR_2(in1_max, S_IRUGO | S_IWUSR, show_voltage,
                            set_voltage, MAX, 1);
static SENSOR_DEVICE_ATTR_2(in1_min, S_IRUGO | S_IWUSR, show_voltage,
                            set_voltage, MIN, 1);
static SENSOR_DEVICE_ATTR_2(in1_alarm, S_IRUGO, show_voltage, NULL, ALARM, 1);
static SENSOR_DEVICE_ATTR_2(in2_input, S_IRUGO, show_voltage, NULL, INPUT, 2);
static SENSOR_DEVICE_ATTR_2(in2_max, S_IRUGO | S_IWUSR, show_voltage,
                            set_voltage, MAX, 2);
static SENSOR_DEVICE_ATTR_2(in2_min, S_IRUGO | S_IWUSR, show_voltage,
                            set_voltage, MIN, 2);
static SENSOR_DEVICE_ATTR_2(in2_alarm, S_IRUGO, show_voltage, NULL, ALARM, 2);
static SENSOR_DEVICE_ATTR_2(in3_input, S_IRUGO, show_voltage, NULL, INPUT, 3);
static SENSOR_DEVICE_ATTR_2(in3_max, S_IRUGO | S_IWUSR, show_voltage,
                            set_voltage, MAX, 3);
static SENSOR_DEVICE_ATTR_2(in3_min, S_IRUGO | S_IWUSR, show_voltage,
                            set_voltage, MIN, 3);
static SENSOR_DEVICE_ATTR_2(in3_alarm, S_IRUGO, show_voltage, NULL, ALARM, 3);
static SENSOR_DEVICE_ATTR_2(in4_input, S_IRUGO, show_voltage, NULL, INPUT, 4);
static SENSOR_DEVICE_ATTR_2(in4_max, S_IRUGO | S_IWUSR, show_voltage,
                            set_voltage, MAX, 4);
static SENSOR_DEVICE_ATTR_2(in4_min, S_IRUGO | S_IWUSR, show_voltage,
                            set_voltage, MIN, 4);
static SENSOR_DEVICE_ATTR_2(in4_alarm, S_IRUGO, show_voltage, NULL, ALARM, 8);
static SENSOR_DEVICE_ATTR_2(in5_input, S_IRUGO, show_voltage, NULL, INPUT, 5);
static SENSOR_DEVICE_ATTR_2(in5_max, S_IRUGO | S_IWUSR, show_voltage,
                            set_voltage, MAX, 5);
static SENSOR_DEVICE_ATTR_2(in5_min, S_IRUGO | S_IWUSR, show_voltage,
                            set_voltage, MIN, 5);
static SENSOR_DEVICE_ATTR_2(in5_alarm, S_IRUGO, show_voltage, NULL, ALARM, 31);
static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, INPUT, 0);
static SENSOR_DEVICE_ATTR_2(temp1_alarm, S_IRUGO, show_temp, NULL, ALARM, 0);
static SENSOR_DEVICE_ATTR_2(temp1_fault, S_IRUGO, show_temp, NULL, FAULT, 0);
static SENSOR_DEVICE_ATTR_2(temp1_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
                            MAX, 0);
static SENSOR_DEVICE_ATTR_2(temp1_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
                            MIN, 0);
static SENSOR_DEVICE_ATTR_2(temp1_offset, S_IRUGO | S_IWUSR, show_temp,
                            set_temp, OFFSET, 0);
static SENSOR_DEVICE_ATTR_2(temp1_auto_point1_temp, S_IRUGO | S_IWUSR,
                            show_temp, set_temp, AUTOMIN, 0);
static SENSOR_DEVICE_ATTR_2(temp1_auto_point2_temp, S_IRUGO | S_IWUSR,
                            show_point2, set_point2, 0, 0);
static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
                            THERM, 0);
static SENSOR_DEVICE_ATTR_2(temp1_crit_hyst, S_IRUGO | S_IWUSR, show_temp,
                            set_temp, HYSTERSIS, 0);
static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, INPUT, 1);
static SENSOR_DEVICE_ATTR_2(temp2_alarm, S_IRUGO, show_temp, NULL, ALARM, 1);
static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
                            MAX, 1);
static SENSOR_DEVICE_ATTR_2(temp2_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
                            MIN, 1);
static SENSOR_DEVICE_ATTR_2(temp2_offset, S_IRUGO | S_IWUSR, show_temp,
                            set_temp, OFFSET, 1);
static SENSOR_DEVICE_ATTR_2(temp2_auto_point1_temp, S_IRUGO | S_IWUSR,
                            show_temp, set_temp, AUTOMIN, 1);
static SENSOR_DEVICE_ATTR_2(temp2_auto_point2_temp, S_IRUGO | S_IWUSR,
                            show_point2, set_point2, 0, 1);
static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
                            THERM, 1);
static SENSOR_DEVICE_ATTR_2(temp2_crit_hyst, S_IRUGO | S_IWUSR, show_temp,
                            set_temp, HYSTERSIS, 1);
static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, INPUT, 2);
static SENSOR_DEVICE_ATTR_2(temp3_alarm, S_IRUGO, show_temp, NULL, ALARM, 2);
static SENSOR_DEVICE_ATTR_2(temp3_fault, S_IRUGO, show_temp, NULL, FAULT, 2);
static SENSOR_DEVICE_ATTR_2(temp3_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
                            MAX, 2);
static SENSOR_DEVICE_ATTR_2(temp3_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
                            MIN, 2);
static SENSOR_DEVICE_ATTR_2(temp3_offset, S_IRUGO | S_IWUSR, show_temp,
                            set_temp, OFFSET, 2);
static SENSOR_DEVICE_ATTR_2(temp3_auto_point1_temp, S_IRUGO | S_IWUSR,
                            show_temp, set_temp, AUTOMIN, 2);
static SENSOR_DEVICE_ATTR_2(temp3_auto_point2_temp, S_IRUGO | S_IWUSR,

                            show_point2, set_point2, 0, 2);
static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
                            THERM, 2);
static SENSOR_DEVICE_ATTR_2(temp3_crit_hyst, S_IRUGO | S_IWUSR, show_temp,
                            set_temp, HYSTERSIS, 2);
static SENSOR_DEVICE_ATTR_2(fan1_input, S_IRUGO, show_tach, NULL, INPUT, 0);
static SENSOR_DEVICE_ATTR_2(fan1_min, S_IRUGO | S_IWUSR, show_tach, set_tach,
                            MIN, 0);
static SENSOR_DEVICE_ATTR_2(fan1_alarm, S_IRUGO, show_tach, NULL, ALARM, 0);
static SENSOR_DEVICE_ATTR_2(fan2_input, S_IRUGO, show_tach, NULL, INPUT, 1);
static SENSOR_DEVICE_ATTR_2(fan2_min, S_IRUGO | S_IWUSR, show_tach, set_tach,
                            MIN, 1);
static SENSOR_DEVICE_ATTR_2(fan2_alarm, S_IRUGO, show_tach, NULL, ALARM, 1);
static SENSOR_DEVICE_ATTR_2(fan3_input, S_IRUGO, show_tach, NULL, INPUT, 2);
static SENSOR_DEVICE_ATTR_2(fan3_min, S_IRUGO | S_IWUSR, show_tach, set_tach,
                            MIN, 2);
static SENSOR_DEVICE_ATTR_2(fan3_alarm, S_IRUGO, show_tach, NULL, ALARM, 2);
static SENSOR_DEVICE_ATTR_2(fan4_input, S_IRUGO, show_tach, NULL, INPUT, 3);
static SENSOR_DEVICE_ATTR_2(fan4_min, S_IRUGO | S_IWUSR, show_tach, set_tach,
                            MIN, 3);
static SENSOR_DEVICE_ATTR_2(fan4_alarm, S_IRUGO, show_tach, NULL, ALARM, 3);
static SENSOR_DEVICE_ATTR_2(pwm1, S_IRUGO | S_IWUSR, show_pwm, set_pwm, INPUT,
                            0);
static SENSOR_DEVICE_ATTR_2(pwm1_freq, S_IRUGO | S_IWUSR, show_pwmfreq,
                            set_pwmfreq, INPUT, 0);
static SENSOR_DEVICE_ATTR_2(pwm1_enable, S_IRUGO | S_IWUSR, show_pwmctrl,
                            set_pwmctrl, INPUT, 0);
static SENSOR_DEVICE_ATTR_2(pwm1_auto_channels_temp, S_IRUGO | S_IWUSR,
                            show_pwmchan, set_pwmchan, INPUT, 0);
static SENSOR_DEVICE_ATTR_2(pwm1_auto_point1_pwm, S_IRUGO | S_IWUSR, show_pwm,
                            set_pwm, MIN, 0);
static SENSOR_DEVICE_ATTR_2(pwm1_auto_point2_pwm, S_IRUGO | S_IWUSR, show_pwm,
                            set_pwm, MAX, 0);
static SENSOR_DEVICE_ATTR_2(pwm2, S_IRUGO | S_IWUSR, show_pwm, set_pwm, INPUT,
                            1);
static SENSOR_DEVICE_ATTR_2(pwm2_freq, S_IRUGO | S_IWUSR, show_pwmfreq,
                            set_pwmfreq, INPUT, 1);
static SENSOR_DEVICE_ATTR_2(pwm2_enable, S_IRUGO | S_IWUSR, show_pwmctrl,
                            set_pwmctrl, INPUT, 1);
static SENSOR_DEVICE_ATTR_2(pwm2_auto_channels_temp, S_IRUGO | S_IWUSR,
                            show_pwmchan, set_pwmchan, INPUT, 1);
static SENSOR_DEVICE_ATTR_2(pwm2_auto_point1_pwm, S_IRUGO | S_IWUSR, show_pwm,
                            set_pwm, MIN, 1);
static SENSOR_DEVICE_ATTR_2(pwm2_auto_point2_pwm, S_IRUGO | S_IWUSR, show_pwm,
                            set_pwm, MAX, 1);
static SENSOR_DEVICE_ATTR_2(pwm3, S_IRUGO | S_IWUSR, show_pwm, set_pwm, INPUT,
                            2);
static SENSOR_DEVICE_ATTR_2(pwm3_freq, S_IRUGO | S_IWUSR, show_pwmfreq,
                            set_pwmfreq, INPUT, 2);
static SENSOR_DEVICE_ATTR_2(pwm3_enable, S_IRUGO | S_IWUSR, show_pwmctrl,
                            set_pwmctrl, INPUT, 2);
static SENSOR_DEVICE_ATTR_2(pwm3_auto_channels_temp, S_IRUGO | S_IWUSR,
                            show_pwmchan, set_pwmchan, INPUT, 2);
static SENSOR_DEVICE_ATTR_2(pwm3_auto_point1_pwm, S_IRUGO | S_IWUSR, show_pwm,
                            set_pwm, MIN, 2);
static SENSOR_DEVICE_ATTR_2(pwm3_auto_point2_pwm, S_IRUGO | S_IWUSR, show_pwm,
                            set_pwm, MAX, 2);

/* Non-standard name, might need revisiting */
static DEVICE_ATTR(pwm_use_point2_pwm_at_crit, S_IWUSR | S_IRUGO,
                   show_pwm_at_crit, set_pwm_at_crit);

static DEVICE_ATTR(vrm, S_IWUSR | S_IRUGO, show_vrm, set_vrm);
static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);

static struct attribute *adt7475_attrs[] = {
        &sensor_dev_attr_in1_input.dev_attr.attr,
        &sensor_dev_attr_in1_max.dev_attr.attr,
        &sensor_dev_attr_in1_min.dev_attr.attr,
        &sensor_dev_attr_in1_alarm.dev_attr.attr,
        &sensor_dev_attr_in2_input.dev_attr.attr,
        &sensor_dev_attr_in2_max.dev_attr.attr,
        &sensor_dev_attr_in2_min.dev_attr.attr,
        &sensor_dev_attr_in2_alarm.dev_attr.attr,
        &sensor_dev_attr_temp1_input.dev_attr.attr,
        &sensor_dev_attr_temp1_alarm.dev_attr.attr,
        &sensor_dev_attr_temp1_fault.dev_attr.attr,
        &sensor_dev_attr_temp1_max.dev_attr.attr,
        &sensor_dev_attr_temp1_min.dev_attr.attr,
        &sensor_dev_attr_temp1_offset.dev_attr.attr,
        &sensor_dev_attr_temp1_auto_point1_temp.dev_attr.attr,
        &sensor_dev_attr_temp1_auto_point2_temp.dev_attr.attr,
        &sensor_dev_attr_temp1_crit.dev_attr.attr,
        &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
        &sensor_dev_attr_temp2_input.dev_attr.attr,
        &sensor_dev_attr_temp2_alarm.dev_attr.attr,
        &sensor_dev_attr_temp2_max.dev_attr.attr,
        &sensor_dev_attr_temp2_min.dev_attr.attr,
        &sensor_dev_attr_temp2_offset.dev_attr.attr,
        &sensor_dev_attr_temp2_auto_point1_temp.dev_attr.attr,
        &sensor_dev_attr_temp2_auto_point2_temp.dev_attr.attr,
        &sensor_dev_attr_temp2_crit.dev_attr.attr,
        &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
        &sensor_dev_attr_temp3_input.dev_attr.attr,
        &sensor_dev_attr_temp3_fault.dev_attr.attr,
        &sensor_dev_attr_temp3_alarm.dev_attr.attr,
        &sensor_dev_attr_temp3_max.dev_attr.attr,
        &sensor_dev_attr_temp3_min.dev_attr.attr,
        &sensor_dev_attr_temp3_offset.dev_attr.attr,
        &sensor_dev_attr_temp3_auto_point1_temp.dev_attr.attr,
        &sensor_dev_attr_temp3_auto_point2_temp.dev_attr.attr,
        &sensor_dev_attr_temp3_crit.dev_attr.attr,
        &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
        &sensor_dev_attr_fan1_input.dev_attr.attr,
        &sensor_dev_attr_fan1_min.dev_attr.attr,
        &sensor_dev_attr_fan1_alarm.dev_attr.attr,
        &sensor_dev_attr_fan2_input.dev_attr.attr,
        &sensor_dev_attr_fan2_min.dev_attr.attr,
        &sensor_dev_attr_fan2_alarm.dev_attr.attr,
        &sensor_dev_attr_fan3_input.dev_attr.attr,
        &sensor_dev_attr_fan3_min.dev_attr.attr,
        &sensor_dev_attr_fan3_alarm.dev_attr.attr,
        &sensor_dev_attr_pwm1.dev_attr.attr,
        &sensor_dev_attr_pwm1_freq.dev_attr.attr,
        &sensor_dev_attr_pwm1_enable.dev_attr.attr,
        &sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr,
        &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
        &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
        &sensor_dev_attr_pwm3.dev_attr.attr,
        &sensor_dev_attr_pwm3_freq.dev_attr.attr,
        &sensor_dev_attr_pwm3_enable.dev_attr.attr,
        &sensor_dev_attr_pwm3_auto_channels_temp.dev_attr.attr,
        &sensor_dev_attr_pwm3_auto_point1_pwm.dev_attr.attr,
        &sensor_dev_attr_pwm3_auto_point2_pwm.dev_attr.attr,
        &dev_attr_pwm_use_point2_pwm_at_crit.attr,
        NULL,
};

static struct attribute *fan4_attrs[] = {
        &sensor_dev_attr_fan4_input.dev_attr.attr,
        &sensor_dev_attr_fan4_min.dev_attr.attr,
        &sensor_dev_attr_fan4_alarm.dev_attr.attr,
        NULL
};

static struct attribute *pwm2_attrs[] = {
        &sensor_dev_attr_pwm2.dev_attr.attr,
        &sensor_dev_attr_pwm2_freq.dev_attr.attr,
        &sensor_dev_attr_pwm2_enable.dev_attr.attr,
        &sensor_dev_attr_pwm2_auto_channels_temp.dev_attr.attr,
        &sensor_dev_attr_pwm2_auto_point1_pwm.dev_attr.attr,
        &sensor_dev_attr_pwm2_auto_point2_pwm.dev_attr.attr,
        NULL
};

static struct attribute *in0_attrs[] = {
        &sensor_dev_attr_in0_input.dev_attr.attr,
        &sensor_dev_attr_in0_max.dev_attr.attr,
        &sensor_dev_attr_in0_min.dev_attr.attr,
        &sensor_dev_attr_in0_alarm.dev_attr.attr,
        NULL
};

static struct attribute *in3_attrs[] = {
        &sensor_dev_attr_in3_input.dev_attr.attr,
        &sensor_dev_attr_in3_max.dev_attr.attr,
        &sensor_dev_attr_in3_min.dev_attr.attr,
        &sensor_dev_attr_in3_alarm.dev_attr.attr,
        NULL
};

static struct attribute *in4_attrs[] = {
        &sensor_dev_attr_in4_input.dev_attr.attr,
        &sensor_dev_attr_in4_max.dev_attr.attr,
        &sensor_dev_attr_in4_min.dev_attr.attr,
        &sensor_dev_attr_in4_alarm.dev_attr.attr,
        NULL
};

static struct attribute *in5_attrs[] = {
        &sensor_dev_attr_in5_input.dev_attr.attr,
        &sensor_dev_attr_in5_max.dev_attr.attr,
        &sensor_dev_attr_in5_min.dev_attr.attr,
        &sensor_dev_attr_in5_alarm.dev_attr.attr,
        NULL
};

static struct attribute *vid_attrs[] = {
        &dev_attr_cpu0_vid.attr,
        &dev_attr_vrm.attr,
        NULL
};

static struct attribute_group adt7475_attr_group = { .attrs = adt7475_attrs };
static struct attribute_group fan4_attr_group = { .attrs = fan4_attrs };
static struct attribute_group pwm2_attr_group = { .attrs = pwm2_attrs };
static struct attribute_group in0_attr_group = { .attrs = in0_attrs };
static struct attribute_group in3_attr_group = { .attrs = in3_attrs };
static struct attribute_group in4_attr_group = { .attrs = in4_attrs };
static struct attribute_group in5_attr_group = { .attrs = in5_attrs };
static struct attribute_group vid_attr_group = { .attrs = vid_attrs };

static int adt7475_detect(struct i2c_client *client,
                          struct i2c_board_info *info)
{
        struct i2c_adapter *adapter = client->adapter;
        int vendid, devid, devid2;
        const char *name;

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

        vendid = adt7475_read(REG_VENDID);
        devid2 = adt7475_read(REG_DEVID2);
        if (vendid != 0x41 ||           /* Analog Devices */
            (devid2 & 0xf8) != 0x68)
                return -ENODEV;

        devid = adt7475_read(REG_DEVID);
        if (devid == 0x73)
                name = "adt7473";
        else if (devid == 0x75 && client->addr == 0x2e)
                name = "adt7475";
        else if (devid == 0x76)
                name = "adt7476";
        else if ((devid2 & 0xfc) == 0x6c)
                name = "adt7490";
        else {
                dev_dbg(&adapter->dev,
                        "Couldn't detect an ADT7473/75/76/90 part at "
                        "0x%02x\n", (unsigned int)client->addr);
                return -ENODEV;
        }

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

        return 0;
}

static void adt7475_remove_files(struct i2c_client *client,
                                 struct adt7475_data *data)
{
        sysfs_remove_group(&client->dev.kobj, &adt7475_attr_group);
        if (data->has_fan4)
                sysfs_remove_group(&client->dev.kobj, &fan4_attr_group);
        if (data->has_pwm2)
                sysfs_remove_group(&client->dev.kobj, &pwm2_attr_group);
        if (data->has_voltage & (1 << 0))
                sysfs_remove_group(&client->dev.kobj, &in0_attr_group);
        if (data->has_voltage & (1 << 3))
                sysfs_remove_group(&client->dev.kobj, &in3_attr_group);
        if (data->has_voltage & (1 << 4))
                sysfs_remove_group(&client->dev.kobj, &in4_attr_group);
        if (data->has_voltage & (1 << 5))
                sysfs_remove_group(&client->dev.kobj, &in5_attr_group);
        if (data->has_vid)
                sysfs_remove_group(&client->dev.kobj, &vid_attr_group);
}

static int adt7475_probe(struct i2c_client *client,
                         const struct i2c_device_id *id)
{
        static const char * const names[] = {
                [adt7473] = "ADT7473",
                [adt7475] = "ADT7475",
                [adt7476] = "ADT7476",
                [adt7490] = "ADT7490",
        };

        struct adt7475_data *data;
        int i, ret = 0, revision;
        u8 config2, config3;

        data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
        if (data == NULL)
                return -ENOMEM;

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

        /* Initialize device-specific values */
        switch (id->driver_data) {
        case adt7476:
                data->has_voltage = 0x0e;       /* in1 to in3 */
                revision = adt7475_read(REG_DEVID2) & 0x07;
                break;
        case adt7490:
                data->has_voltage = 0x3e;       /* in1 to in5 */
                revision = adt7475_read(REG_DEVID2) & 0x03;
                if (revision == 0x03)
                        revision += adt7475_read(REG_DEVREV2);
                break;
        default:
                data->has_voltage = 0x06;       /* in1, in2 */
                revision = adt7475_read(REG_DEVID2) & 0x07;
        }

        config3 = adt7475_read(REG_CONFIG3);
        /* Pin PWM2 may alternatively be used for ALERT output */
        if (!(config3 & CONFIG3_SMBALERT))
                data->has_pwm2 = 1;
        /* Meaning of this bit is inverted for the ADT7473-1 */
        if (id->driver_data == adt7473 && revision >= 1)
                data->has_pwm2 = !data->has_pwm2;

        data->config4 = adt7475_read(REG_CONFIG4);
        /* Pin TACH4 may alternatively be used for THERM */
        if ((data->config4 & CONFIG4_PINFUNC) == 0x0)
                data->has_fan4 = 1;

        /*
         * THERM configuration is more complex on the ADT7476 and ADT7490,
         * because 2 different pins (TACH4 and +2.5 Vin) can be used for
         * this function
         */
        if (id->driver_data == adt7490) {
                if ((data->config4 & CONFIG4_PINFUNC) == 0x1 &&
                    !(config3 & CONFIG3_THERM))
                        data->has_fan4 = 1;
        }
        if (id->driver_data == adt7476 || id->driver_data == adt7490) {
                if (!(config3 & CONFIG3_THERM) ||
                    (data->config4 & CONFIG4_PINFUNC) == 0x1)
                        data->has_voltage |= (1 << 0);          /* in0 */
        }

        /*
         * On the ADT7476, the +12V input pin may instead be used as VID5,
         * and VID pins may alternatively be used as GPIO
         */
        if (id->driver_data == adt7476) {
                u8 vid = adt7475_read(REG_VID);
                if (!(vid & VID_VIDSEL))
                        data->has_voltage |= (1 << 4);          /* in4 */

                data->has_vid = !(adt7475_read(REG_CONFIG5) & CONFIG5_VIDGPIO);
        }

        /* Voltage attenuators can be bypassed, globally or individually */
        config2 = adt7475_read(REG_CONFIG2);
        if (config2 & CONFIG2_ATTN) {
                data->bypass_attn = (0x3 << 3) | 0x3;
        } else {
                data->bypass_attn = ((data->config4 & CONFIG4_ATTN_IN10) >> 4) |
                                    ((data->config4 & CONFIG4_ATTN_IN43) >> 3);
        }
        data->bypass_attn &= data->has_voltage;

        /*
         * Call adt7475_read_pwm for all pwm's as this will reprogram any
         * pwm's which are disabled to manual mode with 0% duty cycle
         */
        for (i = 0; i < ADT7475_PWM_COUNT; i++)
                adt7475_read_pwm(client, i);

        ret = sysfs_create_group(&client->dev.kobj, &adt7475_attr_group);
        if (ret)
                return ret;

        /* Features that can be disabled individually */
        if (data->has_fan4) {
                ret = sysfs_create_group(&client->dev.kobj, &fan4_attr_group);
                if (ret)
                        goto eremove;
        }
        if (data->has_pwm2) {
                ret = sysfs_create_group(&client->dev.kobj, &pwm2_attr_group);
                if (ret)
                        goto eremove;
        }
        if (data->has_voltage & (1 << 0)) {
                ret = sysfs_create_group(&client->dev.kobj, &in0_attr_group);
                if (ret)
                        goto eremove;
        }
        if (data->has_voltage & (1 << 3)) {
                ret = sysfs_create_group(&client->dev.kobj, &in3_attr_group);
                if (ret)
                        goto eremove;
        }
        if (data->has_voltage & (1 << 4)) {
                ret = sysfs_create_group(&client->dev.kobj, &in4_attr_group);
                if (ret)
                        goto eremove;
        }
        if (data->has_voltage & (1 << 5)) {
                ret = sysfs_create_group(&client->dev.kobj, &in5_attr_group);
                if (ret)
                        goto eremove;
        }
        if (data->has_vid) {
                data->vrm = vid_which_vrm();
                ret = sysfs_create_group(&client->dev.kobj, &vid_attr_group);
                if (ret)
                        goto eremove;
        }

        data->hwmon_dev = hwmon_device_register(&client->dev);
        if (IS_ERR(data->hwmon_dev)) {
                ret = PTR_ERR(data->hwmon_dev);
                goto eremove;
        }

        dev_info(&client->dev, "%s device, revision %d\n",
                 names[id->driver_data], revision);
        if ((data->has_voltage & 0x11) || data->has_fan4 || data->has_pwm2)
                dev_info(&client->dev, "Optional features:%s%s%s%s%s\n",
                         (data->has_voltage & (1 << 0)) ? " in0" : "",
                         (data->has_voltage & (1 << 4)) ? " in4" : "",
                         data->has_fan4 ? " fan4" : "",
                         data->has_pwm2 ? " pwm2" : "",
                         data->has_vid ? " vid" : "");
        if (data->bypass_attn)
                dev_info(&client->dev, "Bypassing attenuators on:%s%s%s%s\n",
                         (data->bypass_attn & (1 << 0)) ? " in0" : "",
                         (data->bypass_attn & (1 << 1)) ? " in1" : "",
                         (data->bypass_attn & (1 << 3)) ? " in3" : "",
                         (data->bypass_attn & (1 << 4)) ? " in4" : "");

        return 0;

eremove:
        adt7475_remove_files(client, data);
        return ret;
}

static int adt7475_remove(struct i2c_client *client)
{
        struct adt7475_data *data = i2c_get_clientdata(client);

        hwmon_device_unregister(data->hwmon_dev);
        adt7475_remove_files(client, data);

        return 0;
}

static struct i2c_driver adt7475_driver = {
        .class          = I2C_CLASS_HWMON,
        .driver = {
                .name   = "adt7475",
        },
        .probe          = adt7475_probe,
        .remove         = adt7475_remove,
        .id_table       = adt7475_id,
        .detect         = adt7475_detect,
        .address_list   = normal_i2c,
};

static void adt7475_read_hystersis(struct i2c_client *client)
{
        struct adt7475_data *data = i2c_get_clientdata(client);

        data->temp[HYSTERSIS][0] = (u16) adt7475_read(REG_REMOTE1_HYSTERSIS);
        data->temp[HYSTERSIS][1] = data->temp[HYSTERSIS][0];
        data->temp[HYSTERSIS][2] = (u16) adt7475_read(REG_REMOTE2_HYSTERSIS);
}

static void adt7475_read_pwm(struct i2c_client *client, int index)
{
        struct adt7475_data *data = i2c_get_clientdata(client);
        unsigned int v;

        data->pwm[CONTROL][index] = adt7475_read(PWM_CONFIG_REG(index));

        /*
         * Figure out the internal value for pwmctrl and pwmchan
         * based on the current settings
         */
        v = (data->pwm[CONTROL][index] >> 5) & 7;

        if (v == 3)
                data->pwmctl[index] = 0;
        else if (v == 7)
                data->pwmctl[index] = 1;
        else if (v == 4) {
                /*
                 * The fan is disabled - we don't want to
                 * support that, so change to manual mode and
                 * set the duty cycle to 0 instead
                 */
                data->pwm[INPUT][index] = 0;
                data->pwm[CONTROL][index] &= ~0xE0;
                data->pwm[CONTROL][index] |= (7 << 5);

                i2c_smbus_write_byte_data(client, PWM_CONFIG_REG(index),
                                          data->pwm[INPUT][index]);

                i2c_smbus_write_byte_data(client, PWM_CONFIG_REG(index),
                                          data->pwm[CONTROL][index]);

                data->pwmctl[index] = 1;
        } else {
                data->pwmctl[index] = 2;

                switch (v) {
                case 0:
                        data->pwmchan[index] = 1;
                        break;
                case 1:
                        data->pwmchan[index] = 2;
                        break;
                case 2:
                        data->pwmchan[index] = 4;
                        break;
                case 5:
                        data->pwmchan[index] = 6;
                        break;
                case 6:
                        data->pwmchan[index] = 7;
                        break;
                }
        }
}

static struct adt7475_data *adt7475_update_device(struct device *dev)
{
        struct i2c_client *client = to_i2c_client(dev);
        struct adt7475_data *data = i2c_get_clientdata(client);
        u16 ext;
        int i;

        mutex_lock(&data->lock);

        /* Measurement values update every 2 seconds */
        if (time_after(jiffies, data->measure_updated + HZ * 2) ||
            !data->valid) {
                data->alarms = adt7475_read(REG_STATUS2) << 8;
                data->alarms |= adt7475_read(REG_STATUS1);

                ext = (adt7475_read(REG_EXTEND2) << 8) |
                        adt7475_read(REG_EXTEND1);
                for (i = 0; i < ADT7475_VOLTAGE_COUNT; i++) {
                        if (!(data->has_voltage & (1 << i)))
                                continue;
                        data->voltage[INPUT][i] =
                                (adt7475_read(VOLTAGE_REG(i)) << 2) |
                                ((ext >> (i * 2)) & 3);
                }

                for (i = 0; i < ADT7475_TEMP_COUNT; i++)
                        data->temp[INPUT][i] =
                                (adt7475_read(TEMP_REG(i)) << 2) |
                                ((ext >> ((i + 5) * 2)) & 3);

                if (data->has_voltage & (1 << 5)) {
                        data->alarms |= adt7475_read(REG_STATUS4) << 24;
                        ext = adt7475_read(REG_EXTEND3);
                        data->voltage[INPUT][5] = adt7475_read(REG_VTT) << 2 |
                                ((ext >> 4) & 3);
                }

                for (i = 0; i < ADT7475_TACH_COUNT; i++) {
                        if (i == 3 && !data->has_fan4)
                                continue;
                        data->tach[INPUT][i] =
                                adt7475_read_word(client, TACH_REG(i));
                }

                /* Updated by hw when in auto mode */
                for (i = 0; i < ADT7475_PWM_COUNT; i++) {
                        if (i == 1 && !data->has_pwm2)
                                continue;
                        data->pwm[INPUT][i] = adt7475_read(PWM_REG(i));
                }

                if (data->has_vid)
                        data->vid = adt7475_read(REG_VID) & 0x3f;

                data->measure_updated = jiffies;
        }

        /* Limits and settings, should never change update every 60 seconds */
        if (time_after(jiffies, data->limits_updated + HZ * 60) ||
            !data->valid) {
                data->config4 = adt7475_read(REG_CONFIG4);
                data->config5 = adt7475_read(REG_CONFIG5);

                for (i = 0; i < ADT7475_VOLTAGE_COUNT; i++) {
                        if (!(data->has_voltage & (1 << i)))
                                continue;
                        /* Adjust values so they match the input precision */
                        data->voltage[MIN][i] =
                                adt7475_read(VOLTAGE_MIN_REG(i)) << 2;
                        data->voltage[MAX][i] =
                                adt7475_read(VOLTAGE_MAX_REG(i)) << 2;
                }

                if (data->has_voltage & (1 << 5)) {
                        data->voltage[MIN][5] = adt7475_read(REG_VTT_MIN) << 2;
                        data->voltage[MAX][5] = adt7475_read(REG_VTT_MAX) << 2;
                }

                for (i = 0; i < ADT7475_TEMP_COUNT; i++) {
                        /* Adjust values so they match the input precision */
                        data->temp[MIN][i] =
                                adt7475_read(TEMP_MIN_REG(i)) << 2;
                        data->temp[MAX][i] =
                                adt7475_read(TEMP_MAX_REG(i)) << 2;
                        data->temp[AUTOMIN][i] =
                                adt7475_read(TEMP_TMIN_REG(i)) << 2;
                        data->temp[THERM][i] =
                                adt7475_read(TEMP_THERM_REG(i)) << 2;
                        data->temp[OFFSET][i] =
                                adt7475_read(TEMP_OFFSET_REG(i));
                }
                adt7475_read_hystersis(client);

                for (i = 0; i < ADT7475_TACH_COUNT; i++) {
                        if (i == 3 && !data->has_fan4)
                                continue;
                        data->tach[MIN][i] =
                                adt7475_read_word(client, TACH_MIN_REG(i));
                }

                for (i = 0; i < ADT7475_PWM_COUNT; i++) {
                        if (i == 1 && !data->has_pwm2)
                                continue;
                        data->pwm[MAX][i] = adt7475_read(PWM_MAX_REG(i));
                        data->pwm[MIN][i] = adt7475_read(PWM_MIN_REG(i));
                        /* Set the channel and control information */
                        adt7475_read_pwm(client, i);
                }

                data->range[0] = adt7475_read(TEMP_TRANGE_REG(0));
                data->range[1] = adt7475_read(TEMP_TRANGE_REG(1));
                data->range[2] = adt7475_read(TEMP_TRANGE_REG(2));

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

        mutex_unlock(&data->lock);

        return data;
}

module_i2c_driver(adt7475_driver);

MODULE_AUTHOR("Advanced Micro Devices, Inc");
MODULE_DESCRIPTION("adt7475 driver");
MODULE_LICENSE("GPL");