// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  w83627ehf - Driver for the hardware monitoring functionality of
 *              the Winbond W83627EHF Super-I/O chip
 *  Copyright (C) 2005-2012  Jean Delvare <jdelvare@suse.de>
 *  Copyright (C) 2006  Yuan Mu (Winbond),
 *                      Rudolf Marek <r.marek@assembler.cz>
 *                      David Hubbard <david.c.hubbard@gmail.com>
 *                      Daniel J Blueman <daniel.blueman@gmail.com>
 *  Copyright (C) 2010  Sheng-Yuan Huang (Nuvoton) (PS00)
 *
 *  Shamelessly ripped from the w83627hf driver
 *  Copyright (C) 2003  Mark Studebaker
 *
 *  Thanks to Leon Moonen, Steve Cliffe and Grant Coady for their help
 *  in testing and debugging this driver.
 *
 *  This driver also supports the W83627EHG, which is the lead-free
 *  version of the W83627EHF.
 *
 *  Supports the following chips:
 *
 *  Chip        #vin    #fan    #pwm    #temp  chip IDs       man ID
 *  w83627ehf   10      5       4       3      0x8850 0x88    0x5ca3
 *                                             0x8860 0xa1
 *  w83627dhg    9      5       4       3      0xa020 0xc1    0x5ca3
 *  w83627dhg-p  9      5       4       3      0xb070 0xc1    0x5ca3
 *  w83627uhg    8      2       2       3      0xa230 0xc1    0x5ca3
 *  w83667hg     9      5       3       3      0xa510 0xc1    0x5ca3
 *  w83667hg-b   9      5       3       4      0xb350 0xc1    0x5ca3
 */

#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/platform_device.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/hwmon-vid.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/acpi.h>
#include <linux/io.h>
#include "lm75.h"

enum kinds {
        w83627ehf, w83627dhg, w83627dhg_p, w83627uhg,
        w83667hg, w83667hg_b,
};

/* used to set data->name = w83627ehf_device_names[data->sio_kind] */
static const char * const w83627ehf_device_names[] = {
        "w83627ehf",
        "w83627dhg",
        "w83627dhg",
        "w83627uhg",
        "w83667hg",
        "w83667hg",
};

static unsigned short force_id;
module_param(force_id, ushort, 0);
MODULE_PARM_DESC(force_id, "Override the detected device ID");

#define DRVNAME "w83627ehf"

/*
 * Super-I/O constants and functions
 */

#define W83627EHF_LD_HWM        0x0b
#define W83667HG_LD_VID         0x0d

#define SIO_REG_LDSEL           0x07    /* Logical device select */
#define SIO_REG_DEVID           0x20    /* Device ID (2 bytes) */
#define SIO_REG_EN_VRM10        0x2C    /* GPIO3, GPIO4 selection */
#define SIO_REG_ENABLE          0x30    /* Logical device enable */
#define SIO_REG_ADDR            0x60    /* Logical device address (2 bytes) */
#define SIO_REG_VID_CTRL        0xF0    /* VID control */
#define SIO_REG_VID_DATA        0xF1    /* VID data */

#define SIO_W83627EHF_ID        0x8850
#define SIO_W83627EHG_ID        0x8860
#define SIO_W83627DHG_ID        0xa020
#define SIO_W83627DHG_P_ID      0xb070
#define SIO_W83627UHG_ID        0xa230
#define SIO_W83667HG_ID         0xa510
#define SIO_W83667HG_B_ID       0xb350
#define SIO_ID_MASK             0xFFF0

static inline void
superio_outb(int ioreg, int reg, int val)
{
        outb(reg, ioreg);
        outb(val, ioreg + 1);
}

static inline int
superio_inb(int ioreg, int reg)
{
        outb(reg, ioreg);
        return inb(ioreg + 1);
}

static inline void
superio_select(int ioreg, int ld)
{
        outb(SIO_REG_LDSEL, ioreg);
        outb(ld, ioreg + 1);
}

static inline int
superio_enter(int ioreg)
{
        if (!request_muxed_region(ioreg, 2, DRVNAME))
                return -EBUSY;

        outb(0x87, ioreg);
        outb(0x87, ioreg);

        return 0;
}

static inline void
superio_exit(int ioreg)
{
        outb(0xaa, ioreg);
        outb(0x02, ioreg);
        outb(0x02, ioreg + 1);
        release_region(ioreg, 2);
}

/*
 * ISA constants
 */

#define IOREGION_ALIGNMENT      (~7)
#define IOREGION_OFFSET         5
#define IOREGION_LENGTH         2
#define ADDR_REG_OFFSET         0
#define DATA_REG_OFFSET         1

#define W83627EHF_REG_BANK              0x4E
#define W83627EHF_REG_CONFIG            0x40

/*
 * Not currently used:
 * REG_MAN_ID has the value 0x5ca3 for all supported chips.
 * REG_CHIP_ID == 0x88/0xa1/0xc1 depending on chip model.
 * REG_MAN_ID is at port 0x4f
 * REG_CHIP_ID is at port 0x58
 */

static const u16 W83627EHF_REG_FAN[] = { 0x28, 0x29, 0x2a, 0x3f, 0x553 };
static const u16 W83627EHF_REG_FAN_MIN[] = { 0x3b, 0x3c, 0x3d, 0x3e, 0x55c };

/* The W83627EHF registers for nr=7,8,9 are in bank 5 */
#define W83627EHF_REG_IN_MAX(nr)        ((nr < 7) ? (0x2b + (nr) * 2) : \
                                         (0x554 + (((nr) - 7) * 2)))
#define W83627EHF_REG_IN_MIN(nr)        ((nr < 7) ? (0x2c + (nr) * 2) : \
                                         (0x555 + (((nr) - 7) * 2)))
#define W83627EHF_REG_IN(nr)            ((nr < 7) ? (0x20 + (nr)) : \
                                         (0x550 + (nr) - 7))

static const u16 W83627EHF_REG_TEMP[] = { 0x27, 0x150, 0x250, 0x7e };
static const u16 W83627EHF_REG_TEMP_HYST[] = { 0x3a, 0x153, 0x253, 0 };
static const u16 W83627EHF_REG_TEMP_OVER[] = { 0x39, 0x155, 0x255, 0 };
static const u16 W83627EHF_REG_TEMP_CONFIG[] = { 0, 0x152, 0x252, 0 };

/* Fan clock dividers are spread over the following five registers */
#define W83627EHF_REG_FANDIV1           0x47
#define W83627EHF_REG_FANDIV2           0x4B
#define W83627EHF_REG_VBAT              0x5D
#define W83627EHF_REG_DIODE             0x59
#define W83627EHF_REG_SMI_OVT           0x4C

#define W83627EHF_REG_ALARM1            0x459
#define W83627EHF_REG_ALARM2            0x45A
#define W83627EHF_REG_ALARM3            0x45B

#define W83627EHF_REG_CASEOPEN_DET      0x42 /* SMI STATUS #2 */
#define W83627EHF_REG_CASEOPEN_CLR      0x46 /* SMI MASK #3 */

/* SmartFan registers */
#define W83627EHF_REG_FAN_STEPUP_TIME 0x0f
#define W83627EHF_REG_FAN_STEPDOWN_TIME 0x0e

/* DC or PWM output fan configuration */
static const u8 W83627EHF_REG_PWM_ENABLE[] = {
        0x04,                   /* SYS FAN0 output mode and PWM mode */
        0x04,                   /* CPU FAN0 output mode and PWM mode */
        0x12,                   /* AUX FAN mode */
        0x62,                   /* CPU FAN1 mode */
};

static const u8 W83627EHF_PWM_MODE_SHIFT[] = { 0, 1, 0, 6 };
static const u8 W83627EHF_PWM_ENABLE_SHIFT[] = { 2, 4, 1, 4 };

/* FAN Duty Cycle, be used to control */
static const u16 W83627EHF_REG_PWM[] = { 0x01, 0x03, 0x11, 0x61 };
static const u16 W83627EHF_REG_TARGET[] = { 0x05, 0x06, 0x13, 0x63 };
static const u8 W83627EHF_REG_TOLERANCE[] = { 0x07, 0x07, 0x14, 0x62 };

/* Advanced Fan control, some values are common for all fans */
static const u16 W83627EHF_REG_FAN_START_OUTPUT[] = { 0x0a, 0x0b, 0x16, 0x65 };
static const u16 W83627EHF_REG_FAN_STOP_OUTPUT[] = { 0x08, 0x09, 0x15, 0x64 };
static const u16 W83627EHF_REG_FAN_STOP_TIME[] = { 0x0c, 0x0d, 0x17, 0x66 };

static const u16 W83627EHF_REG_FAN_MAX_OUTPUT_COMMON[]
                                                = { 0xff, 0x67, 0xff, 0x69 };
static const u16 W83627EHF_REG_FAN_STEP_OUTPUT_COMMON[]
                                                = { 0xff, 0x68, 0xff, 0x6a };

static const u16 W83627EHF_REG_FAN_MAX_OUTPUT_W83667_B[] = { 0x67, 0x69, 0x6b };
static const u16 W83627EHF_REG_FAN_STEP_OUTPUT_W83667_B[]
                                                = { 0x68, 0x6a, 0x6c };

static const u16 W83627EHF_REG_TEMP_OFFSET[] = { 0x454, 0x455, 0x456 };

static const char *const w83667hg_b_temp_label[] = {
        "SYSTIN",
        "CPUTIN",
        "AUXTIN",
        "AMDTSI",
        "PECI Agent 1",
        "PECI Agent 2",
        "PECI Agent 3",
        "PECI Agent 4"
};

#define NUM_REG_TEMP    ARRAY_SIZE(W83627EHF_REG_TEMP)

static int is_word_sized(u16 reg)
{
        return ((((reg & 0xff00) == 0x100
              || (reg & 0xff00) == 0x200)
             && ((reg & 0x00ff) == 0x50
              || (reg & 0x00ff) == 0x53
              || (reg & 0x00ff) == 0x55))
             || (reg & 0xfff0) == 0x630
             || reg == 0x640 || reg == 0x642
             || ((reg & 0xfff0) == 0x650
                 && (reg & 0x000f) >= 0x06)
             || reg == 0x73 || reg == 0x75 || reg == 0x77
                );
}

/*
 * Conversions
 */

/* 1 is PWM mode, output in ms */
static inline unsigned int step_time_from_reg(u8 reg, u8 mode)
{
        return mode ? 100 * reg : 400 * reg;
}

static inline u8 step_time_to_reg(unsigned int msec, u8 mode)
{
        return clamp_val((mode ? (msec + 50) / 100 : (msec + 200) / 400),
                         1, 255);
}

static unsigned int fan_from_reg8(u16 reg, unsigned int divreg)
{
        if (reg == 0 || reg == 255)
                return 0;
        return 1350000U / (reg << divreg);
}

static inline unsigned int
div_from_reg(u8 reg)
{
        return 1 << reg;
}

/*
 * Some of the voltage inputs have internal scaling, the tables below
 * contain 8 (the ADC LSB in mV) * scaling factor * 100
 */
static const u16 scale_in_common[10] = {
        800, 800, 1600, 1600, 800, 800, 800, 1600, 1600, 800
};
static const u16 scale_in_w83627uhg[9] = {
        800, 800, 3328, 3424, 800, 800, 0, 3328, 3400
};

static inline long in_from_reg(u8 reg, u8 nr, const u16 *scale_in)
{
        return DIV_ROUND_CLOSEST(reg * scale_in[nr], 100);
}

static inline u8 in_to_reg(u32 val, u8 nr, const u16 *scale_in)
{
        return clamp_val(DIV_ROUND_CLOSEST(val * 100, scale_in[nr]), 0, 255);
}

/*
 * Data structures and manipulation thereof
 */

struct w83627ehf_data {
        int addr;       /* IO base of hw monitor block */
        const char *name;

        struct mutex lock;

        u16 reg_temp[NUM_REG_TEMP];
        u16 reg_temp_over[NUM_REG_TEMP];
        u16 reg_temp_hyst[NUM_REG_TEMP];
        u16 reg_temp_config[NUM_REG_TEMP];
        u8 temp_src[NUM_REG_TEMP];
        const char * const *temp_label;

        const u16 *REG_FAN_MAX_OUTPUT;
        const u16 *REG_FAN_STEP_OUTPUT;
        const u16 *scale_in;

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

        /* Register values */
        u8 bank;                /* current register bank */
        u8 in_num;              /* number of in inputs we have */
        u8 in[10];              /* Register value */
        u8 in_max[10];          /* Register value */
        u8 in_min[10];          /* Register value */
        unsigned int rpm[5];
        u16 fan_min[5];
        u8 fan_div[5];
        u8 has_fan;             /* some fan inputs can be disabled */
        u8 has_fan_min;         /* some fans don't have min register */
        u8 temp_type[3];
        s8 temp_offset[3];
        s16 temp[9];
        s16 temp_max[9];
        s16 temp_max_hyst[9];
        u32 alarms;
        u8 caseopen;

        u8 pwm_mode[4]; /* 0->DC variable voltage, 1->PWM variable duty cycle */
        u8 pwm_enable[4]; /* 1->manual
                           * 2->thermal cruise mode (also called SmartFan I)
                           * 3->fan speed cruise mode
                           * 4->variable thermal cruise (also called
                           * SmartFan III)
                           * 5->enhanced variable thermal cruise (also called
                           * SmartFan IV)
                           */
        u8 pwm_enable_orig[4];  /* original value of pwm_enable */
        u8 pwm_num;             /* number of pwm */
        u8 pwm[4];
        u8 target_temp[4];
        u8 tolerance[4];

        u8 fan_start_output[4]; /* minimum fan speed when spinning up */
        u8 fan_stop_output[4]; /* minimum fan speed when spinning down */
        u8 fan_stop_time[4]; /* time at minimum before disabling fan */
        u8 fan_max_output[4]; /* maximum fan speed */
        u8 fan_step_output[4]; /* rate of change output value */

        u8 vid;
        u8 vrm;

        u16 have_temp;
        u16 have_temp_offset;
        u8 in6_skip:1;
        u8 temp3_val_only:1;
        u8 have_vid:1;

#ifdef CONFIG_PM
        /* Remember extra register values over suspend/resume */
        u8 vbat;
        u8 fandiv1;
        u8 fandiv2;
#endif
};

struct w83627ehf_sio_data {
        int sioreg;
        enum kinds kind;
};

/*
 * On older chips, only registers 0x50-0x5f are banked.
 * On more recent chips, all registers are banked.
 * Assume that is the case and set the bank number for each access.
 * Cache the bank number so it only needs to be set if it changes.
 */
static inline void w83627ehf_set_bank(struct w83627ehf_data *data, u16 reg)
{
        u8 bank = reg >> 8;
        if (data->bank != bank) {
                outb_p(W83627EHF_REG_BANK, data->addr + ADDR_REG_OFFSET);
                outb_p(bank, data->addr + DATA_REG_OFFSET);
                data->bank = bank;
        }
}

static u16 w83627ehf_read_value(struct w83627ehf_data *data, u16 reg)
{
        int res, word_sized = is_word_sized(reg);

        mutex_lock(&data->lock);

        w83627ehf_set_bank(data, reg);
        outb_p(reg & 0xff, data->addr + ADDR_REG_OFFSET);
        res = inb_p(data->addr + DATA_REG_OFFSET);
        if (word_sized) {
                outb_p((reg & 0xff) + 1,
                       data->addr + ADDR_REG_OFFSET);
                res = (res << 8) + inb_p(data->addr + DATA_REG_OFFSET);
        }

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

static int w83627ehf_write_value(struct w83627ehf_data *data, u16 reg,
                                 u16 value)
{
        int word_sized = is_word_sized(reg);

        mutex_lock(&data->lock);

        w83627ehf_set_bank(data, reg);
        outb_p(reg & 0xff, data->addr + ADDR_REG_OFFSET);
        if (word_sized) {
                outb_p(value >> 8, data->addr + DATA_REG_OFFSET);
                outb_p((reg & 0xff) + 1,
                       data->addr + ADDR_REG_OFFSET);
        }
        outb_p(value & 0xff, data->addr + DATA_REG_OFFSET);

        mutex_unlock(&data->lock);
        return 0;
}

/* We left-align 8-bit temperature values to make the code simpler */
static u16 w83627ehf_read_temp(struct w83627ehf_data *data, u16 reg)
{
        u16 res;

        res = w83627ehf_read_value(data, reg);
        if (!is_word_sized(reg))
                res <<= 8;

        return res;
}

static int w83627ehf_write_temp(struct w83627ehf_data *data, u16 reg,
                                       u16 value)
{
        if (!is_word_sized(reg))
                value >>= 8;
        return w83627ehf_write_value(data, reg, value);
}

/* This function assumes that the caller holds data->update_lock */
static void w83627ehf_write_fan_div(struct w83627ehf_data *data, int nr)
{
        u8 reg;

        switch (nr) {
        case 0:
                reg = (w83627ehf_read_value(data, W83627EHF_REG_FANDIV1) & 0xcf)
                    | ((data->fan_div[0] & 0x03) << 4);
                /* fan5 input control bit is write only, compute the value */
                reg |= (data->has_fan & (1 << 4)) ? 1 : 0;
                w83627ehf_write_value(data, W83627EHF_REG_FANDIV1, reg);
                reg = (w83627ehf_read_value(data, W83627EHF_REG_VBAT) & 0xdf)
                    | ((data->fan_div[0] & 0x04) << 3);
                w83627ehf_write_value(data, W83627EHF_REG_VBAT, reg);
                break;
        case 1:
                reg = (w83627ehf_read_value(data, W83627EHF_REG_FANDIV1) & 0x3f)
                    | ((data->fan_div[1] & 0x03) << 6);
                /* fan5 input control bit is write only, compute the value */
                reg |= (data->has_fan & (1 << 4)) ? 1 : 0;
                w83627ehf_write_value(data, W83627EHF_REG_FANDIV1, reg);
                reg = (w83627ehf_read_value(data, W83627EHF_REG_VBAT) & 0xbf)
                    | ((data->fan_div[1] & 0x04) << 4);
                w83627ehf_write_value(data, W83627EHF_REG_VBAT, reg);
                break;
        case 2:
                reg = (w83627ehf_read_value(data, W83627EHF_REG_FANDIV2) & 0x3f)
                    | ((data->fan_div[2] & 0x03) << 6);
                w83627ehf_write_value(data, W83627EHF_REG_FANDIV2, reg);
                reg = (w83627ehf_read_value(data, W83627EHF_REG_VBAT) & 0x7f)
                    | ((data->fan_div[2] & 0x04) << 5);
                w83627ehf_write_value(data, W83627EHF_REG_VBAT, reg);
                break;
        case 3:
                reg = (w83627ehf_read_value(data, W83627EHF_REG_DIODE) & 0xfc)
                    | (data->fan_div[3] & 0x03);
                w83627ehf_write_value(data, W83627EHF_REG_DIODE, reg);
                reg = (w83627ehf_read_value(data, W83627EHF_REG_SMI_OVT) & 0x7f)
                    | ((data->fan_div[3] & 0x04) << 5);
                w83627ehf_write_value(data, W83627EHF_REG_SMI_OVT, reg);
                break;
        case 4:
                reg = (w83627ehf_read_value(data, W83627EHF_REG_DIODE) & 0x73)
                    | ((data->fan_div[4] & 0x03) << 2)
                    | ((data->fan_div[4] & 0x04) << 5);
                w83627ehf_write_value(data, W83627EHF_REG_DIODE, reg);
                break;
        }
}

static void w83627ehf_update_fan_div(struct w83627ehf_data *data)
{
        int i;

        i = w83627ehf_read_value(data, W83627EHF_REG_FANDIV1);
        data->fan_div[0] = (i >> 4) & 0x03;
        data->fan_div[1] = (i >> 6) & 0x03;
        i = w83627ehf_read_value(data, W83627EHF_REG_FANDIV2);
        data->fan_div[2] = (i >> 6) & 0x03;
        i = w83627ehf_read_value(data, W83627EHF_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->has_fan & ((1 << 3) | (1 << 4))) {
                i = w83627ehf_read_value(data, W83627EHF_REG_DIODE);
                data->fan_div[3] = i & 0x03;
                data->fan_div[4] = ((i >> 2) & 0x03)
                                 | ((i >> 5) & 0x04);
        }
        if (data->has_fan & (1 << 3)) {
                i = w83627ehf_read_value(data, W83627EHF_REG_SMI_OVT);
                data->fan_div[3] |= (i >> 5) & 0x04;
        }
}

static void w83627ehf_update_pwm(struct w83627ehf_data *data)
{
        int i;
        int pwmcfg = 0, tolerance = 0; /* shut up the compiler */

        for (i = 0; i < data->pwm_num; i++) {
                if (!(data->has_fan & (1 << i)))
                        continue;

                /* pwmcfg, tolerance mapped for i=0, i=1 to same reg */
                if (i != 1) {
                        pwmcfg = w83627ehf_read_value(data,
                                        W83627EHF_REG_PWM_ENABLE[i]);
                        tolerance = w83627ehf_read_value(data,
                                        W83627EHF_REG_TOLERANCE[i]);
                }
                data->pwm_mode[i] =
                        ((pwmcfg >> W83627EHF_PWM_MODE_SHIFT[i]) & 1) ? 0 : 1;
                data->pwm_enable[i] = ((pwmcfg >> W83627EHF_PWM_ENABLE_SHIFT[i])
                                       & 3) + 1;
                data->pwm[i] = w83627ehf_read_value(data, W83627EHF_REG_PWM[i]);

                data->tolerance[i] = (tolerance >> (i == 1 ? 4 : 0)) & 0x0f;
        }
}

static struct w83627ehf_data *w83627ehf_update_device(struct device *dev)
{
        struct w83627ehf_data *data = dev_get_drvdata(dev);
        int i;

        mutex_lock(&data->update_lock);

        if (time_after(jiffies, data->last_updated + HZ + HZ/2)
         || !data->valid) {
                /* Fan clock dividers */
                w83627ehf_update_fan_div(data);

                /* Measured voltages and limits */
                for (i = 0; i < data->in_num; i++) {
                        if ((i == 6) && data->in6_skip)
                                continue;

                        data->in[i] = w83627ehf_read_value(data,
                                      W83627EHF_REG_IN(i));
                        data->in_min[i] = w83627ehf_read_value(data,
                                          W83627EHF_REG_IN_MIN(i));
                        data->in_max[i] = w83627ehf_read_value(data,
                                          W83627EHF_REG_IN_MAX(i));
                }

                /* Measured fan speeds and limits */
                for (i = 0; i < 5; i++) {
                        u16 reg;

                        if (!(data->has_fan & (1 << i)))
                                continue;

                        reg = w83627ehf_read_value(data, W83627EHF_REG_FAN[i]);
                        data->rpm[i] = fan_from_reg8(reg, data->fan_div[i]);

                        if (data->has_fan_min & (1 << i))
                                data->fan_min[i] = w83627ehf_read_value(data,
                                           W83627EHF_REG_FAN_MIN[i]);

                        /*
                         * If we failed to measure the fan speed and clock
                         * divider can be increased, let's try that for next
                         * time
                         */
                        if (reg >= 0xff && data->fan_div[i] < 0x07) {
                                dev_dbg(dev,
                                        "Increasing fan%d clock divider from %u to %u\n",
                                        i + 1, div_from_reg(data->fan_div[i]),
                                        div_from_reg(data->fan_div[i] + 1));
                                data->fan_div[i]++;
                                w83627ehf_write_fan_div(data, i);
                                /* Preserve min limit if possible */
                                if ((data->has_fan_min & (1 << i))
                                 && data->fan_min[i] >= 2
                                 && data->fan_min[i] != 255)
                                        w83627ehf_write_value(data,
                                                W83627EHF_REG_FAN_MIN[i],
                                                (data->fan_min[i] /= 2));
                        }
                }

                w83627ehf_update_pwm(data);

                for (i = 0; i < data->pwm_num; i++) {
                        if (!(data->has_fan & (1 << i)))
                                continue;

                        data->fan_start_output[i] =
                          w83627ehf_read_value(data,
                                             W83627EHF_REG_FAN_START_OUTPUT[i]);
                        data->fan_stop_output[i] =
                          w83627ehf_read_value(data,
                                             W83627EHF_REG_FAN_STOP_OUTPUT[i]);
                        data->fan_stop_time[i] =
                          w83627ehf_read_value(data,
                                               W83627EHF_REG_FAN_STOP_TIME[i]);

                        if (data->REG_FAN_MAX_OUTPUT &&
                            data->REG_FAN_MAX_OUTPUT[i] != 0xff)
                                data->fan_max_output[i] =
                                  w83627ehf_read_value(data,
                                                data->REG_FAN_MAX_OUTPUT[i]);

                        if (data->REG_FAN_STEP_OUTPUT &&
                            data->REG_FAN_STEP_OUTPUT[i] != 0xff)
                                data->fan_step_output[i] =
                                  w83627ehf_read_value(data,
                                                data->REG_FAN_STEP_OUTPUT[i]);

                        data->target_temp[i] =
                                w83627ehf_read_value(data,
                                        W83627EHF_REG_TARGET[i]) &
                                        (data->pwm_mode[i] == 1 ? 0x7f : 0xff);
                }

                /* Measured temperatures and limits */
                for (i = 0; i < NUM_REG_TEMP; i++) {
                        if (!(data->have_temp & (1 << i)))
                                continue;
                        data->temp[i] = w83627ehf_read_temp(data,
                                                data->reg_temp[i]);
                        if (data->reg_temp_over[i])
                                data->temp_max[i]
                                  = w83627ehf_read_temp(data,
                                                data->reg_temp_over[i]);
                        if (data->reg_temp_hyst[i])
                                data->temp_max_hyst[i]
                                  = w83627ehf_read_temp(data,
                                                data->reg_temp_hyst[i]);
                        if (i > 2)
                                continue;
                        if (data->have_temp_offset & (1 << i))
                                data->temp_offset[i]
                                  = w83627ehf_read_value(data,
                                                W83627EHF_REG_TEMP_OFFSET[i]);
                }

                data->alarms = w83627ehf_read_value(data,
                                        W83627EHF_REG_ALARM1) |
                               (w83627ehf_read_value(data,
                                        W83627EHF_REG_ALARM2) << 8) |
                               (w83627ehf_read_value(data,
                                        W83627EHF_REG_ALARM3) << 16);

                data->caseopen = w83627ehf_read_value(data,
                                                W83627EHF_REG_CASEOPEN_DET);

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

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

#define store_in_reg(REG, reg) \
static int \
store_in_##reg(struct device *dev, struct w83627ehf_data *data, int channel, \
               long val) \
{ \
        if (val < 0) \
                return -EINVAL; \
        mutex_lock(&data->update_lock); \
        data->in_##reg[channel] = in_to_reg(val, channel, data->scale_in); \
        w83627ehf_write_value(data, W83627EHF_REG_IN_##REG(channel), \
                              data->in_##reg[channel]); \
        mutex_unlock(&data->update_lock); \
        return 0; \
}

store_in_reg(MIN, min)
store_in_reg(MAX, max)

static int
store_fan_min(struct device *dev, struct w83627ehf_data *data, int channel,
              long val)
{
        unsigned int reg;
        u8 new_div;

        if (val < 0)
                return -EINVAL;

        mutex_lock(&data->update_lock);
        if (!val) {
                /* No min limit, alarm disabled */
                data->fan_min[channel] = 255;
                new_div = data->fan_div[channel]; /* No change */
                dev_info(dev, "fan%u low limit and alarm disabled\n",
                         channel + 1);
        } else if ((reg = 1350000U / val) >= 128 * 255) {
                /*
                 * Speed below this value cannot possibly be represented,
                 * even with the highest divider (128)
                 */
                data->fan_min[channel] = 254;
                new_div = 7; /* 128 == (1 << 7) */
                dev_warn(dev,
                         "fan%u low limit %lu below minimum %u, set to minimum\n",
                         channel + 1, val, fan_from_reg8(254, 7));
        } else if (!reg) {
                /*
                 * Speed above this value cannot possibly be represented,
                 * even with the lowest divider (1)
                 */
                data->fan_min[channel] = 1;
                new_div = 0; /* 1 == (1 << 0) */
                dev_warn(dev,
                         "fan%u low limit %lu above maximum %u, set to maximum\n",
                         channel + 1, val, fan_from_reg8(1, 0));
        } else {
                /*
                 * Automatically pick the best divider, i.e. the one such
                 * that the min limit will correspond to a register value
                 * in the 96..192 range
                 */
                new_div = 0;
                while (reg > 192 && new_div < 7) {
                        reg >>= 1;
                        new_div++;
                }
                data->fan_min[channel] = reg;
        }

        /*
         * Write both the fan clock divider (if it changed) and the new
         * fan min (unconditionally)
         */
        if (new_div != data->fan_div[channel]) {
                dev_dbg(dev, "fan%u clock divider changed from %u to %u\n",
                        channel + 1, div_from_reg(data->fan_div[channel]),
                        div_from_reg(new_div));
                data->fan_div[channel] = new_div;
                w83627ehf_write_fan_div(data, channel);
                /* Give the chip time to sample a new speed value */
                data->last_updated = jiffies;
        }

        w83627ehf_write_value(data, W83627EHF_REG_FAN_MIN[channel],
                              data->fan_min[channel]);
        mutex_unlock(&data->update_lock);

        return 0;
}

#define store_temp_reg(addr, reg) \
static int \
store_##reg(struct device *dev, struct w83627ehf_data *data, int channel, \
            long val) \
{ \
        mutex_lock(&data->update_lock); \
        data->reg[channel] = LM75_TEMP_TO_REG(val); \
        w83627ehf_write_temp(data, data->addr[channel], data->reg[channel]); \
        mutex_unlock(&data->update_lock); \
        return 0; \
}
store_temp_reg(reg_temp_over, temp_max);
store_temp_reg(reg_temp_hyst, temp_max_hyst);

static int
store_temp_offset(struct device *dev, struct w83627ehf_data *data, int channel,
                  long val)
{
        val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), -128, 127);

        mutex_lock(&data->update_lock);
        data->temp_offset[channel] = val;
        w83627ehf_write_value(data, W83627EHF_REG_TEMP_OFFSET[channel], val);
        mutex_unlock(&data->update_lock);
        return 0;
}

static int
store_pwm_mode(struct device *dev, struct w83627ehf_data *data, int channel,
               long val)
{
        u16 reg;

        if (val < 0 || val > 1)
                return -EINVAL;

        mutex_lock(&data->update_lock);
        reg = w83627ehf_read_value(data, W83627EHF_REG_PWM_ENABLE[channel]);
        data->pwm_mode[channel] = val;
        reg &= ~(1 << W83627EHF_PWM_MODE_SHIFT[channel]);
        if (!val)
                reg |= 1 << W83627EHF_PWM_MODE_SHIFT[channel];
        w83627ehf_write_value(data, W83627EHF_REG_PWM_ENABLE[channel], reg);
        mutex_unlock(&data->update_lock);
        return 0;
}

static int
store_pwm(struct device *dev, struct w83627ehf_data *data, int channel,
          long val)
{
        val = clamp_val(val, 0, 255);

        mutex_lock(&data->update_lock);
        data->pwm[channel] = val;
        w83627ehf_write_value(data, W83627EHF_REG_PWM[channel], val);
        mutex_unlock(&data->update_lock);
        return 0;
}

static int
store_pwm_enable(struct device *dev, struct w83627ehf_data *data, int channel,
                 long val)
{
        u16 reg;

        if (!val || val < 0 ||
            (val > 4 && val != data->pwm_enable_orig[channel]))
                return -EINVAL;

        mutex_lock(&data->update_lock);
        data->pwm_enable[channel] = val;
        reg = w83627ehf_read_value(data,
                                   W83627EHF_REG_PWM_ENABLE[channel]);
        reg &= ~(0x03 << W83627EHF_PWM_ENABLE_SHIFT[channel]);
        reg |= (val - 1) << W83627EHF_PWM_ENABLE_SHIFT[channel];
        w83627ehf_write_value(data, W83627EHF_REG_PWM_ENABLE[channel],
                              reg);
        mutex_unlock(&data->update_lock);
        return 0;
}

#define show_tol_temp(reg) \
static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
                                char *buf) \
{ \
        struct w83627ehf_data *data = w83627ehf_update_device(dev->parent); \
        struct sensor_device_attribute *sensor_attr = \
                to_sensor_dev_attr(attr); \
        int nr = sensor_attr->index; \
        return sprintf(buf, "%d\n", data->reg[nr] * 1000); \
}

show_tol_temp(tolerance)
show_tol_temp(target_temp)

static ssize_t
store_target_temp(struct device *dev, struct device_attribute *attr,
                        const char *buf, size_t count)
{
        struct w83627ehf_data *data = dev_get_drvdata(dev);
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        int nr = sensor_attr->index;
        long val;
        int err;

        err = kstrtol(buf, 10, &val);
        if (err < 0)
                return err;

        val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, 127);

        mutex_lock(&data->update_lock);
        data->target_temp[nr] = val;
        w83627ehf_write_value(data, W83627EHF_REG_TARGET[nr], val);
        mutex_unlock(&data->update_lock);
        return count;
}

static ssize_t
store_tolerance(struct device *dev, struct device_attribute *attr,
                        const char *buf, size_t count)
{
        struct w83627ehf_data *data = dev_get_drvdata(dev);
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        int nr = sensor_attr->index;
        u16 reg;
        long val;
        int err;

        err = kstrtol(buf, 10, &val);
        if (err < 0)
                return err;

        /* Limit the temp to 0C - 15C */
        val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, 15);

        mutex_lock(&data->update_lock);
        reg = w83627ehf_read_value(data, W83627EHF_REG_TOLERANCE[nr]);
        if (nr == 1)
                reg = (reg & 0x0f) | (val << 4);
        else
                reg = (reg & 0xf0) | val;
        w83627ehf_write_value(data, W83627EHF_REG_TOLERANCE[nr], reg);
        data->tolerance[nr] = val;
        mutex_unlock(&data->update_lock);
        return count;
}

static SENSOR_DEVICE_ATTR(pwm1_target, 0644, show_target_temp,
            store_target_temp, 0);
static SENSOR_DEVICE_ATTR(pwm2_target, 0644, show_target_temp,
            store_target_temp, 1);
static SENSOR_DEVICE_ATTR(pwm3_target, 0644, show_target_temp,
            store_target_temp, 2);
static SENSOR_DEVICE_ATTR(pwm4_target, 0644, show_target_temp,
            store_target_temp, 3);

static SENSOR_DEVICE_ATTR(pwm1_tolerance, 0644, show_tolerance,
            store_tolerance, 0);
static SENSOR_DEVICE_ATTR(pwm2_tolerance, 0644, show_tolerance,
            store_tolerance, 1);
static SENSOR_DEVICE_ATTR(pwm3_tolerance, 0644, show_tolerance,
            store_tolerance, 2);
static SENSOR_DEVICE_ATTR(pwm4_tolerance, 0644, show_tolerance,
            store_tolerance, 3);

/* Smart Fan registers */

#define fan_functions(reg, REG) \
static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
                       char *buf) \
{ \
        struct w83627ehf_data *data = w83627ehf_update_device(dev->parent); \
        struct sensor_device_attribute *sensor_attr = \
                to_sensor_dev_attr(attr); \
        int nr = sensor_attr->index; \
        return sprintf(buf, "%d\n", data->reg[nr]); \
} \
static ssize_t \
store_##reg(struct device *dev, struct device_attribute *attr, \
                            const char *buf, size_t count) \
{ \
        struct w83627ehf_data *data = dev_get_drvdata(dev); \
        struct sensor_device_attribute *sensor_attr = \
                to_sensor_dev_attr(attr); \
        int nr = sensor_attr->index; \
        unsigned long val; \
        int err; \
        err = kstrtoul(buf, 10, &val); \
        if (err < 0) \
                return err; \
        val = clamp_val(val, 1, 255); \
        mutex_lock(&data->update_lock); \
        data->reg[nr] = val; \
        w83627ehf_write_value(data, REG[nr], val); \
        mutex_unlock(&data->update_lock); \
        return count; \
}

fan_functions(fan_start_output, W83627EHF_REG_FAN_START_OUTPUT)
fan_functions(fan_stop_output, W83627EHF_REG_FAN_STOP_OUTPUT)
fan_functions(fan_max_output, data->REG_FAN_MAX_OUTPUT)
fan_functions(fan_step_output, data->REG_FAN_STEP_OUTPUT)

#define fan_time_functions(reg, REG) \
static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
                                char *buf) \
{ \
        struct w83627ehf_data *data = w83627ehf_update_device(dev->parent); \
        struct sensor_device_attribute *sensor_attr = \

                to_sensor_dev_attr(attr); \
        int nr = sensor_attr->index; \
        return sprintf(buf, "%d\n", \
                        step_time_from_reg(data->reg[nr], \
                                           data->pwm_mode[nr])); \
} \
\
static ssize_t \
store_##reg(struct device *dev, struct device_attribute *attr, \
                        const char *buf, size_t count) \
{ \
        struct w83627ehf_data *data = dev_get_drvdata(dev); \
        struct sensor_device_attribute *sensor_attr = \
                to_sensor_dev_attr(attr); \
        int nr = sensor_attr->index; \
        unsigned long val; \
        int err; \
        err = kstrtoul(buf, 10, &val); \
        if (err < 0) \
                return err; \
        val = step_time_to_reg(val, data->pwm_mode[nr]); \
        mutex_lock(&data->update_lock); \
        data->reg[nr] = val; \
        w83627ehf_write_value(data, REG[nr], val); \
        mutex_unlock(&data->update_lock); \
        return count; \
} \

fan_time_functions(fan_stop_time, W83627EHF_REG_FAN_STOP_TIME)

static SENSOR_DEVICE_ATTR(pwm4_stop_time, 0644, show_fan_stop_time,
            store_fan_stop_time, 3);
static SENSOR_DEVICE_ATTR(pwm4_start_output, 0644, show_fan_start_output,
            store_fan_start_output, 3);
static SENSOR_DEVICE_ATTR(pwm4_stop_output, 0644, show_fan_stop_output,
            store_fan_stop_output, 3);
static SENSOR_DEVICE_ATTR(pwm4_max_output, 0644, show_fan_max_output,
            store_fan_max_output, 3);
static SENSOR_DEVICE_ATTR(pwm4_step_output, 0644, show_fan_step_output,
            store_fan_step_output, 3);

static SENSOR_DEVICE_ATTR(pwm3_stop_time, 0644, show_fan_stop_time,
            store_fan_stop_time, 2);
static SENSOR_DEVICE_ATTR(pwm3_start_output, 0644, show_fan_start_output,
            store_fan_start_output, 2);
static SENSOR_DEVICE_ATTR(pwm3_stop_output, 0644, show_fan_stop_output,
                    store_fan_stop_output, 2);

static SENSOR_DEVICE_ATTR(pwm1_stop_time, 0644, show_fan_stop_time,
            store_fan_stop_time, 0);
static SENSOR_DEVICE_ATTR(pwm2_stop_time, 0644, show_fan_stop_time,
            store_fan_stop_time, 1);
static SENSOR_DEVICE_ATTR(pwm1_start_output, 0644, show_fan_start_output,
            store_fan_start_output, 0);
static SENSOR_DEVICE_ATTR(pwm2_start_output, 0644, show_fan_start_output,
            store_fan_start_output, 1);
static SENSOR_DEVICE_ATTR(pwm1_stop_output, 0644, show_fan_stop_output,
            store_fan_stop_output, 0);
static SENSOR_DEVICE_ATTR(pwm2_stop_output, 0644, show_fan_stop_output,
            store_fan_stop_output, 1);


/*
 * pwm1 and pwm3 don't support max and step settings on all chips.
 * Need to check support while generating/removing attribute files.
 */
static SENSOR_DEVICE_ATTR(pwm1_max_output, 0644, show_fan_max_output,
            store_fan_max_output, 0);
static SENSOR_DEVICE_ATTR(pwm1_step_output, 0644, show_fan_step_output,
            store_fan_step_output, 0);
static SENSOR_DEVICE_ATTR(pwm2_max_output, 0644, show_fan_max_output,
            store_fan_max_output, 1);
static SENSOR_DEVICE_ATTR(pwm2_step_output, 0644, show_fan_step_output,
            store_fan_step_output, 1);
static SENSOR_DEVICE_ATTR(pwm3_max_output, 0644, show_fan_max_output,
            store_fan_max_output, 2);
static SENSOR_DEVICE_ATTR(pwm3_step_output, 0644, show_fan_step_output,
            store_fan_step_output, 2);

static ssize_t
cpu0_vid_show(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct w83627ehf_data *data = dev_get_drvdata(dev);
        return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
}
DEVICE_ATTR_RO(cpu0_vid);


/* Case open detection */
static int
clear_caseopen(struct device *dev, struct w83627ehf_data *data, int channel,
               long val)
{
        const u16 mask = 0x80;
        u16 reg;

        if (val != 0 || channel != 0)
                return -EINVAL;

        mutex_lock(&data->update_lock);
        reg = w83627ehf_read_value(data, W83627EHF_REG_CASEOPEN_CLR);
        w83627ehf_write_value(data, W83627EHF_REG_CASEOPEN_CLR, reg | mask);
        w83627ehf_write_value(data, W83627EHF_REG_CASEOPEN_CLR, reg & ~mask);
        data->valid = 0;        /* Force cache refresh */
        mutex_unlock(&data->update_lock);

        return 0;
}

static umode_t w83627ehf_attrs_visible(struct kobject *kobj,
                                       struct attribute *a, int n)
{
        struct device *dev = kobj_to_dev(kobj);
        struct w83627ehf_data *data = dev_get_drvdata(dev);
        struct device_attribute *devattr;
        struct sensor_device_attribute *sda;

        devattr = container_of(a, struct device_attribute, attr);

        /* Not sensor */
        if (devattr->show == cpu0_vid_show && data->have_vid)
                return a->mode;

        sda = (struct sensor_device_attribute *)devattr;

        if (sda->index < 2 &&
                (devattr->show == show_fan_stop_time ||
                 devattr->show == show_fan_start_output ||
                 devattr->show == show_fan_stop_output))
                return a->mode;

        if (sda->index < 3 &&
                (devattr->show == show_fan_max_output ||
                 devattr->show == show_fan_step_output) &&
                data->REG_FAN_STEP_OUTPUT &&
                data->REG_FAN_STEP_OUTPUT[sda->index] != 0xff)
                return a->mode;

        /* if fan3 and fan4 are enabled create the files for them */
        if (sda->index == 2 &&
                (data->has_fan & (1 << 2)) && data->pwm_num >= 3 &&
                (devattr->show == show_fan_stop_time ||
                 devattr->show == show_fan_start_output ||
                 devattr->show == show_fan_stop_output))
                return a->mode;

        if (sda->index == 3 &&
                (data->has_fan & (1 << 3)) && data->pwm_num >= 4 &&
                (devattr->show == show_fan_stop_time ||
                 devattr->show == show_fan_start_output ||
                 devattr->show == show_fan_stop_output ||
                 devattr->show == show_fan_max_output ||
                 devattr->show == show_fan_step_output))
                return a->mode;

        if ((devattr->show == show_target_temp ||
            devattr->show == show_tolerance) &&
            (data->has_fan & (1 << sda->index)) &&
            sda->index < data->pwm_num)
                return a->mode;

        return 0;
}

/* These groups handle non-standard attributes used in this device */
static struct attribute *w83627ehf_attrs[] = {

        &sensor_dev_attr_pwm1_stop_time.dev_attr.attr,
        &sensor_dev_attr_pwm1_start_output.dev_attr.attr,
        &sensor_dev_attr_pwm1_stop_output.dev_attr.attr,
        &sensor_dev_attr_pwm1_max_output.dev_attr.attr,
        &sensor_dev_attr_pwm1_step_output.dev_attr.attr,
        &sensor_dev_attr_pwm1_target.dev_attr.attr,
        &sensor_dev_attr_pwm1_tolerance.dev_attr.attr,

        &sensor_dev_attr_pwm2_stop_time.dev_attr.attr,
        &sensor_dev_attr_pwm2_start_output.dev_attr.attr,
        &sensor_dev_attr_pwm2_stop_output.dev_attr.attr,
        &sensor_dev_attr_pwm2_max_output.dev_attr.attr,
        &sensor_dev_attr_pwm2_step_output.dev_attr.attr,
        &sensor_dev_attr_pwm2_target.dev_attr.attr,
        &sensor_dev_attr_pwm2_tolerance.dev_attr.attr,

        &sensor_dev_attr_pwm3_stop_time.dev_attr.attr,
        &sensor_dev_attr_pwm3_start_output.dev_attr.attr,
        &sensor_dev_attr_pwm3_stop_output.dev_attr.attr,
        &sensor_dev_attr_pwm3_max_output.dev_attr.attr,
        &sensor_dev_attr_pwm3_step_output.dev_attr.attr,
        &sensor_dev_attr_pwm3_target.dev_attr.attr,
        &sensor_dev_attr_pwm3_tolerance.dev_attr.attr,

        &sensor_dev_attr_pwm4_stop_time.dev_attr.attr,
        &sensor_dev_attr_pwm4_start_output.dev_attr.attr,
        &sensor_dev_attr_pwm4_stop_output.dev_attr.attr,
        &sensor_dev_attr_pwm4_max_output.dev_attr.attr,
        &sensor_dev_attr_pwm4_step_output.dev_attr.attr,
        &sensor_dev_attr_pwm4_target.dev_attr.attr,
        &sensor_dev_attr_pwm4_tolerance.dev_attr.attr,

        &dev_attr_cpu0_vid.attr,
        NULL
};

static const struct attribute_group w83627ehf_group = {
        .attrs = w83627ehf_attrs,
        .is_visible = w83627ehf_attrs_visible,
};

static const struct attribute_group *w83627ehf_groups[] = {
        &w83627ehf_group,
        NULL
};

/*
 * Driver and device management
 */

/* Get the monitoring functions started */
static inline void w83627ehf_init_device(struct w83627ehf_data *data,
                                                   enum kinds kind)
{
        int i;
        u8 tmp, diode;

        /* Start monitoring is needed */
        tmp = w83627ehf_read_value(data, W83627EHF_REG_CONFIG);
        if (!(tmp & 0x01))
                w83627ehf_write_value(data, W83627EHF_REG_CONFIG,
                                      tmp | 0x01);

        /* Enable temperature sensors if needed */
        for (i = 0; i < NUM_REG_TEMP; i++) {
                if (!(data->have_temp & (1 << i)))
                        continue;
                if (!data->reg_temp_config[i])
                        continue;
                tmp = w83627ehf_read_value(data,
                                           data->reg_temp_config[i]);
                if (tmp & 0x01)
                        w83627ehf_write_value(data,
                                              data->reg_temp_config[i],
                                              tmp & 0xfe);
        }

        /* Enable VBAT monitoring if needed */
        tmp = w83627ehf_read_value(data, W83627EHF_REG_VBAT);
        if (!(tmp & 0x01))
                w83627ehf_write_value(data, W83627EHF_REG_VBAT, tmp | 0x01);

        /* Get thermal sensor types */
        switch (kind) {
        case w83627ehf:
                diode = w83627ehf_read_value(data, W83627EHF_REG_DIODE);
                break;
        case w83627uhg:
                diode = 0x00;
                break;
        default:
                diode = 0x70;
        }
        for (i = 0; i < 3; i++) {
                const char *label = NULL;

                if (data->temp_label)
                        label = data->temp_label[data->temp_src[i]];

                /* Digital source overrides analog type */
                if (label && strncmp(label, "PECI", 4) == 0)
                        data->temp_type[i] = 6;
                else if (label && strncmp(label, "AMD", 3) == 0)
                        data->temp_type[i] = 5;
                else if ((tmp & (0x02 << i)))
                        data->temp_type[i] = (diode & (0x10 << i)) ? 1 : 3;
                else
                        data->temp_type[i] = 4; /* thermistor */
        }
}

static void
w83627ehf_set_temp_reg_ehf(struct w83627ehf_data *data, int n_temp)
{
        int i;

        for (i = 0; i < n_temp; i++) {
                data->reg_temp[i] = W83627EHF_REG_TEMP[i];
                data->reg_temp_over[i] = W83627EHF_REG_TEMP_OVER[i];
                data->reg_temp_hyst[i] = W83627EHF_REG_TEMP_HYST[i];
                data->reg_temp_config[i] = W83627EHF_REG_TEMP_CONFIG[i];
        }
}

static void
w83627ehf_check_fan_inputs(const struct w83627ehf_sio_data *sio_data,
                           struct w83627ehf_data *data)
{
        int fan3pin, fan4pin, fan5pin, regval;

        /* The W83627UHG is simple, only two fan inputs, no config */
        if (sio_data->kind == w83627uhg) {
                data->has_fan = 0x03; /* fan1 and fan2 */
                data->has_fan_min = 0x03;
                return;
        }

        /* fan4 and fan5 share some pins with the GPIO and serial flash */
        if (sio_data->kind == w83667hg || sio_data->kind == w83667hg_b) {
                fan3pin = 1;
                fan4pin = superio_inb(sio_data->sioreg, 0x27) & 0x40;
                fan5pin = superio_inb(sio_data->sioreg, 0x27) & 0x20;
        } else {
                fan3pin = 1;
                fan4pin = !(superio_inb(sio_data->sioreg, 0x29) & 0x06);
                fan5pin = !(superio_inb(sio_data->sioreg, 0x24) & 0x02);
        }

        data->has_fan = data->has_fan_min = 0x03; /* fan1 and fan2 */
        data->has_fan |= (fan3pin << 2);
        data->has_fan_min |= (fan3pin << 2);

        /*
         * It looks like fan4 and fan5 pins can be alternatively used
         * as fan on/off switches, but fan5 control is write only :/
         * We assume that if the serial interface is disabled, designers
         * connected fan5 as input unless they are emitting log 1, which
         * is not the default.
         */
        regval = w83627ehf_read_value(data, W83627EHF_REG_FANDIV1);
        if ((regval & (1 << 2)) && fan4pin) {
                data->has_fan |= (1 << 3);
                data->has_fan_min |= (1 << 3);
        }
        if (!(regval & (1 << 1)) && fan5pin) {
                data->has_fan |= (1 << 4);
                data->has_fan_min |= (1 << 4);
        }
}

static umode_t
w83627ehf_is_visible(const void *drvdata, enum hwmon_sensor_types type,
                     u32 attr, int channel)
{
        const struct w83627ehf_data *data = drvdata;

        switch (type) {
        case hwmon_temp:
                /* channel 0.., name 1.. */
                if (!(data->have_temp & (1 << channel)))
                        return 0;
                if (attr == hwmon_temp_input)
                        return 0444;
                if (attr == hwmon_temp_label) {
                        if (data->temp_label)
                                return 0444;
                        return 0;
                }
                if (channel == 2 && data->temp3_val_only)
                        return 0;
                if (attr == hwmon_temp_max) {
                        if (data->reg_temp_over[channel])
                                return 0644;
                        else
                                return 0;
                }
                if (attr == hwmon_temp_max_hyst) {
                        if (data->reg_temp_hyst[channel])
                                return 0644;
                        else
                                return 0;
                }
                if (channel > 2)
                        return 0;
                if (attr == hwmon_temp_alarm || attr == hwmon_temp_type)
                        return 0444;
                if (attr == hwmon_temp_offset) {
                        if (data->have_temp_offset & (1 << channel))
                                return 0644;
                        else
                                return 0;
                }
                break;

        case hwmon_fan:
                /* channel 0.., name 1.. */
                if (!(data->has_fan & (1 << channel)))
                        return 0;
                if (attr == hwmon_fan_input || attr == hwmon_fan_alarm)
                        return 0444;
                if (attr == hwmon_fan_div) {
                        return 0444;
                }
                if (attr == hwmon_fan_min) {
                        if (data->has_fan_min & (1 << channel))
                                return 0644;
                        else
                                return 0;
                }
                break;

        case hwmon_in:
                /* channel 0.., name 0.. */
                if (channel >= data->in_num)
                        return 0;
                if (channel == 6 && data->in6_skip)
                        return 0;
                if (attr == hwmon_in_alarm || attr == hwmon_in_input)
                        return 0444;
                if (attr == hwmon_in_min || attr == hwmon_in_max)
                        return 0644;
                break;

        case hwmon_pwm:
                /* channel 0.., name 1.. */
                if (!(data->has_fan & (1 << channel)) ||
                    channel >= data->pwm_num)
                        return 0;
                if (attr == hwmon_pwm_mode || attr == hwmon_pwm_enable ||
                    attr == hwmon_pwm_input)
                        return 0644;
                break;

        case hwmon_intrusion:
                return 0644;

        default: /* Shouldn't happen */
                return 0;
        }

        return 0; /* Shouldn't happen */
}

static int
w83627ehf_do_read_temp(struct w83627ehf_data *data, u32 attr,
                       int channel, long *val)
{
        switch (attr) {
        case hwmon_temp_input:
                *val = LM75_TEMP_FROM_REG(data->temp[channel]);
                return 0;
        case hwmon_temp_max:
                *val = LM75_TEMP_FROM_REG(data->temp_max[channel]);
                return 0;
        case hwmon_temp_max_hyst:
                *val = LM75_TEMP_FROM_REG(data->temp_max_hyst[channel]);
                return 0;
        case hwmon_temp_offset:
                *val = data->temp_offset[channel] * 1000;
                return 0;
        case hwmon_temp_type:
                *val = (int)data->temp_type[channel];
                return 0;
        case hwmon_temp_alarm:
                if (channel < 3) {
                        int bit[] = { 4, 5, 13 };
                        *val = (data->alarms >> bit[channel]) & 1;
                        return 0;
                }
                break;

        default:
                break;
        }

        return -EOPNOTSUPP;
}

static int
w83627ehf_do_read_in(struct w83627ehf_data *data, u32 attr,
                     int channel, long *val)
{
        switch (attr) {
        case hwmon_in_input:
                *val = in_from_reg(data->in[channel], channel, data->scale_in);
                return 0;
        case hwmon_in_min:
                *val = in_from_reg(data->in_min[channel], channel,
                                   data->scale_in);
                return 0;
        case hwmon_in_max:
                *val = in_from_reg(data->in_max[channel], channel,
                                   data->scale_in);
                return 0;
        case hwmon_in_alarm:
                if (channel < 10) {
                        int bit[] = { 0, 1, 2, 3, 8, 21, 20, 16, 17, 19 };
                        *val = (data->alarms >> bit[channel]) & 1;
                        return 0;
                }
                break;
        default:
                break;
        }
        return -EOPNOTSUPP;
}

static int
w83627ehf_do_read_fan(struct w83627ehf_data *data, u32 attr,
                      int channel, long *val)
{
        switch (attr) {
        case hwmon_fan_input:
                *val = data->rpm[channel];
                return 0;
        case hwmon_fan_min:
                *val = fan_from_reg8(data->fan_min[channel],
                                     data->fan_div[channel]);
                return 0;
        case hwmon_fan_div:
                *val = div_from_reg(data->fan_div[channel]);
                return 0;
        case hwmon_fan_alarm:
                if (channel < 5) {
                        int bit[] = { 6, 7, 11, 10, 23 };
                        *val = (data->alarms >> bit[channel]) & 1;
                        return 0;
                }
                break;
        default:
                break;
        }
        return -EOPNOTSUPP;
}

static int
w83627ehf_do_read_pwm(struct w83627ehf_data *data, u32 attr,
                      int channel, long *val)
{
        switch (attr) {
        case hwmon_pwm_input:
                *val = data->pwm[channel];
                return 0;
        case hwmon_pwm_enable:
                *val = data->pwm_enable[channel];
                return 0;
        case hwmon_pwm_mode:
                *val = data->pwm_enable[channel];
                return 0;
        default:
                break;
        }
        return -EOPNOTSUPP;
}

static int
w83627ehf_do_read_intrusion(struct w83627ehf_data *data, u32 attr,
                            int channel, long *val)
{
        if (attr != hwmon_intrusion_alarm || channel != 0)
                return -EOPNOTSUPP; /* shouldn't happen */

        *val = !!(data->caseopen & 0x10);
        return 0;
}

static int
w83627ehf_read(struct device *dev, enum hwmon_sensor_types type,
                        u32 attr, int channel, long *val)
{
        struct w83627ehf_data *data = w83627ehf_update_device(dev->parent);

        switch (type) {
        case hwmon_fan:
                return w83627ehf_do_read_fan(data, attr, channel, val);

        case hwmon_in:
                return w83627ehf_do_read_in(data, attr, channel, val);

        case hwmon_pwm:
                return w83627ehf_do_read_pwm(data, attr, channel, val);

        case hwmon_temp:
                return w83627ehf_do_read_temp(data, attr, channel, val);

        case hwmon_intrusion:
                return w83627ehf_do_read_intrusion(data, attr, channel, val);

        default:
                break;
        }

        return -EOPNOTSUPP;
}

static int
w83627ehf_read_string(struct device *dev, enum hwmon_sensor_types type,
                      u32 attr, int channel, const char **str)
{
        struct w83627ehf_data *data = dev_get_drvdata(dev);

        switch (type) {
        case hwmon_temp:
                if (attr == hwmon_temp_label) {
                        *str = data->temp_label[data->temp_src[channel]];
                        return 0;
                }
                break;

        default:
                break;
        }
        /* Nothing else should be read as a string */
        return -EOPNOTSUPP;
}

static int
w83627ehf_write(struct device *dev, enum hwmon_sensor_types type,
                        u32 attr, int channel, long val)
{
        struct w83627ehf_data *data = dev_get_drvdata(dev);

        if (type == hwmon_in && attr == hwmon_in_min)
                return store_in_min(dev, data, channel, val);
        if (type == hwmon_in && attr == hwmon_in_max)
                return store_in_max(dev, data, channel, val);

        if (type == hwmon_fan && attr == hwmon_fan_min)
                return store_fan_min(dev, data, channel, val);

        if (type == hwmon_temp && attr == hwmon_temp_max)
                return store_temp_max(dev, data, channel, val);
        if (type == hwmon_temp && attr == hwmon_temp_max_hyst)
                return store_temp_max_hyst(dev, data, channel, val);
        if (type == hwmon_temp && attr == hwmon_temp_offset)
                return store_temp_offset(dev, data, channel, val);

        if (type == hwmon_pwm && attr == hwmon_pwm_mode)
                return store_pwm_mode(dev, data, channel, val);
        if (type == hwmon_pwm && attr == hwmon_pwm_enable)
                return store_pwm_enable(dev, data, channel, val);
        if (type == hwmon_pwm && attr == hwmon_pwm_input)
                return store_pwm(dev, data, channel, val);

        if (type == hwmon_intrusion && attr == hwmon_intrusion_alarm)
                return clear_caseopen(dev, data, channel, val);

        return -EOPNOTSUPP;
}

static const struct hwmon_ops w83627ehf_ops = {
        .is_visible = w83627ehf_is_visible,
        .read = w83627ehf_read,
        .read_string = w83627ehf_read_string,
        .write = w83627ehf_write,
};

static const struct hwmon_channel_info *w83627ehf_info[] = {
        HWMON_CHANNEL_INFO(fan,
                HWMON_F_ALARM | HWMON_F_DIV | HWMON_F_INPUT | HWMON_F_MIN,
                HWMON_F_ALARM | HWMON_F_DIV | HWMON_F_INPUT | HWMON_F_MIN,
                HWMON_F_ALARM | HWMON_F_DIV | HWMON_F_INPUT | HWMON_F_MIN,
                HWMON_F_ALARM | HWMON_F_DIV | HWMON_F_INPUT | HWMON_F_MIN,
                HWMON_F_ALARM | HWMON_F_DIV | HWMON_F_INPUT | HWMON_F_MIN),
        HWMON_CHANNEL_INFO(in,
                HWMON_I_ALARM | HWMON_I_INPUT | HWMON_I_MAX | HWMON_I_MIN,
                HWMON_I_ALARM | HWMON_I_INPUT | HWMON_I_MAX | HWMON_I_MIN,
                HWMON_I_ALARM | HWMON_I_INPUT | HWMON_I_MAX | HWMON_I_MIN,
                HWMON_I_ALARM | HWMON_I_INPUT | HWMON_I_MAX | HWMON_I_MIN,
                HWMON_I_ALARM | HWMON_I_INPUT | HWMON_I_MAX | HWMON_I_MIN,
                HWMON_I_ALARM | HWMON_I_INPUT | HWMON_I_MAX | HWMON_I_MIN,
                HWMON_I_ALARM | HWMON_I_INPUT | HWMON_I_MAX | HWMON_I_MIN,
                HWMON_I_ALARM | HWMON_I_INPUT | HWMON_I_MAX | HWMON_I_MIN,
                HWMON_I_ALARM | HWMON_I_INPUT | HWMON_I_MAX | HWMON_I_MIN,
                HWMON_I_ALARM | HWMON_I_INPUT | HWMON_I_MAX | HWMON_I_MIN),
        HWMON_CHANNEL_INFO(pwm,
                HWMON_PWM_ENABLE | HWMON_PWM_INPUT | HWMON_PWM_MODE,
                HWMON_PWM_ENABLE | HWMON_PWM_INPUT | HWMON_PWM_MODE,
                HWMON_PWM_ENABLE | HWMON_PWM_INPUT | HWMON_PWM_MODE,
                HWMON_PWM_ENABLE | HWMON_PWM_INPUT | HWMON_PWM_MODE),
        HWMON_CHANNEL_INFO(temp,
                HWMON_T_ALARM | HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_MAX |
                        HWMON_T_MAX_HYST | HWMON_T_OFFSET | HWMON_T_TYPE,
                HWMON_T_ALARM | HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_MAX |
                        HWMON_T_MAX_HYST | HWMON_T_OFFSET | HWMON_T_TYPE,
                HWMON_T_ALARM | HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_MAX |
                        HWMON_T_MAX_HYST | HWMON_T_OFFSET | HWMON_T_TYPE,
                HWMON_T_ALARM | HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_MAX |
                        HWMON_T_MAX_HYST | HWMON_T_OFFSET | HWMON_T_TYPE,
                HWMON_T_ALARM | HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_MAX |
                        HWMON_T_MAX_HYST | HWMON_T_OFFSET | HWMON_T_TYPE,
                HWMON_T_ALARM | HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_MAX |
                        HWMON_T_MAX_HYST | HWMON_T_OFFSET | HWMON_T_TYPE,
                HWMON_T_ALARM | HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_MAX |
                        HWMON_T_MAX_HYST | HWMON_T_OFFSET | HWMON_T_TYPE,
                HWMON_T_ALARM | HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_MAX |
                        HWMON_T_MAX_HYST | HWMON_T_OFFSET | HWMON_T_TYPE,
                HWMON_T_ALARM | HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_MAX |
                        HWMON_T_MAX_HYST | HWMON_T_OFFSET | HWMON_T_TYPE),
        HWMON_CHANNEL_INFO(intrusion,
                HWMON_INTRUSION_ALARM),
        NULL
};

static const struct hwmon_chip_info w83627ehf_chip_info = {
        .ops = &w83627ehf_ops,
        .info = w83627ehf_info,
};

static int w83627ehf_probe(struct platform_device *pdev)
{
        struct device *dev = &pdev->dev;
        struct w83627ehf_sio_data *sio_data = dev_get_platdata(dev);
        struct w83627ehf_data *data;
        struct resource *res;
        u8 en_vrm10;
        int i, err = 0;
        struct device *hwmon_dev;

        res = platform_get_resource(pdev, IORESOURCE_IO, 0);
        if (!request_region(res->start, IOREGION_LENGTH, DRVNAME)) {
                err = -EBUSY;
                dev_err(dev, "Failed to request region 0x%lx-0x%lx\n",
                        (unsigned long)res->start,
                        (unsigned long)res->start + IOREGION_LENGTH - 1);
                goto exit;
        }

        data = devm_kzalloc(&pdev->dev, sizeof(struct w83627ehf_data),
                            GFP_KERNEL);
        if (!data) {
                err = -ENOMEM;
                goto exit_release;
        }

        data->addr = res->start;
        mutex_init(&data->lock);
        mutex_init(&data->update_lock);
        data->name = w83627ehf_device_names[sio_data->kind];
        data->bank = 0xff;              /* Force initial bank selection */
        platform_set_drvdata(pdev, data);

        /* 627EHG and 627EHF have 10 voltage inputs; 627DHG and 667HG have 9 */
        data->in_num = (sio_data->kind == w83627ehf) ? 10 : 9;
        /* 667HG has 3 pwms, and 627UHG has only 2 */
        switch (sio_data->kind) {
        default:
                data->pwm_num = 4;
                break;
        case w83667hg:
        case w83667hg_b:
                data->pwm_num = 3;
                break;
        case w83627uhg:
                data->pwm_num = 2;
                break;
        }

        /* Default to 3 temperature inputs, code below will adjust as needed */
        data->have_temp = 0x07;

        /* Deal with temperature register setup first. */
        if (sio_data->kind == w83667hg_b) {
                u8 reg;

                w83627ehf_set_temp_reg_ehf(data, 4);

                /*
                 * Temperature sources are selected with bank 0, registers 0x49
                 * and 0x4a.
                 */
                reg = w83627ehf_read_value(data, 0x4a);
                data->temp_src[0] = reg >> 5;
                reg = w83627ehf_read_value(data, 0x49);
                data->temp_src[1] = reg & 0x07;
                data->temp_src[2] = (reg >> 4) & 0x07;

                /*
                 * W83667HG-B has another temperature register at 0x7e.
                 * The temperature source is selected with register 0x7d.
                 * Support it if the source differs from already reported
                 * sources.
                 */
                reg = w83627ehf_read_value(data, 0x7d);
                reg &= 0x07;
                if (reg != data->temp_src[0] && reg != data->temp_src[1]
                    && reg != data->temp_src[2]) {
                        data->temp_src[3] = reg;
                        data->have_temp |= 1 << 3;
                }

                /*
                 * Chip supports either AUXTIN or VIN3. Try to find out which
                 * one.
                 */
                reg = w83627ehf_read_value(data, W83627EHF_REG_TEMP_CONFIG[2]);
                if (data->temp_src[2] == 2 && (reg & 0x01))
                        data->have_temp &= ~(1 << 2);

                if ((data->temp_src[2] == 2 && (data->have_temp & (1 << 2)))
                    || (data->temp_src[3] == 2 && (data->have_temp & (1 << 3))))
                        data->in6_skip = 1;

                data->temp_label = w83667hg_b_temp_label;
                data->have_temp_offset = data->have_temp & 0x07;
                for (i = 0; i < 3; i++) {
                        if (data->temp_src[i] > 2)
                                data->have_temp_offset &= ~(1 << i);
                }
        } else if (sio_data->kind == w83627uhg) {
                u8 reg;

                w83627ehf_set_temp_reg_ehf(data, 3);

                /*
                 * Temperature sources for temp2 and temp3 are selected with
                 * bank 0, registers 0x49 and 0x4a.
                 */
                data->temp_src[0] = 0;  /* SYSTIN */
                reg = w83627ehf_read_value(data, 0x49) & 0x07;
                /* Adjust to have the same mapping as other source registers */
                if (reg == 0)
                        data->temp_src[1] = 1;
                else if (reg >= 2 && reg <= 5)
                        data->temp_src[1] = reg + 2;
                else    /* should never happen */
                        data->have_temp &= ~(1 << 1);
                reg = w83627ehf_read_value(data, 0x4a);
                data->temp_src[2] = reg >> 5;

                /*
                 * Skip temp3 if source is invalid or the same as temp1
                 * or temp2.
                 */
                if (data->temp_src[2] == 2 || data->temp_src[2] == 3 ||
                    data->temp_src[2] == data->temp_src[0] ||
                    ((data->have_temp & (1 << 1)) &&
                     data->temp_src[2] == data->temp_src[1]))
                        data->have_temp &= ~(1 << 2);
                else
                        data->temp3_val_only = 1;       /* No limit regs */

                data->in6_skip = 1;                     /* No VIN3 */

                data->temp_label = w83667hg_b_temp_label;
                data->have_temp_offset = data->have_temp & 0x03;
                for (i = 0; i < 3; i++) {
                        if (data->temp_src[i] > 1)
                                data->have_temp_offset &= ~(1 << i);
                }
        } else {
                w83627ehf_set_temp_reg_ehf(data, 3);

                /* Temperature sources are fixed */

                if (sio_data->kind == w83667hg) {
                        u8 reg;

                        /*
                         * Chip supports either AUXTIN or VIN3. Try to find
                         * out which one.
                         */
                        reg = w83627ehf_read_value(data,
                                                W83627EHF_REG_TEMP_CONFIG[2]);
                        if (reg & 0x01)
                                data->have_temp &= ~(1 << 2);
                        else
                                data->in6_skip = 1;
                }
                data->have_temp_offset = data->have_temp & 0x07;
        }

        if (sio_data->kind == w83667hg_b) {
                data->REG_FAN_MAX_OUTPUT =
                  W83627EHF_REG_FAN_MAX_OUTPUT_W83667_B;
                data->REG_FAN_STEP_OUTPUT =
                  W83627EHF_REG_FAN_STEP_OUTPUT_W83667_B;
        } else {
                data->REG_FAN_MAX_OUTPUT =
                  W83627EHF_REG_FAN_MAX_OUTPUT_COMMON;
                data->REG_FAN_STEP_OUTPUT =
                  W83627EHF_REG_FAN_STEP_OUTPUT_COMMON;
        }

        /* Setup input voltage scaling factors */
        if (sio_data->kind == w83627uhg)
                data->scale_in = scale_in_w83627uhg;
        else
                data->scale_in = scale_in_common;

        /* Initialize the chip */
        w83627ehf_init_device(data, sio_data->kind);

        data->vrm = vid_which_vrm();

        err = superio_enter(sio_data->sioreg);
        if (err)
                goto exit_release;

        /* Read VID value */
        if (sio_data->kind == w83667hg || sio_data->kind == w83667hg_b) {
                /*
                 * W83667HG has different pins for VID input and output, so
                 * we can get the VID input values directly at logical device D
                 * 0xe3.
                 */
                superio_select(sio_data->sioreg, W83667HG_LD_VID);
                data->vid = superio_inb(sio_data->sioreg, 0xe3);
                data->have_vid = true;
        } else if (sio_data->kind != w83627uhg) {
                superio_select(sio_data->sioreg, W83627EHF_LD_HWM);
                if (superio_inb(sio_data->sioreg, SIO_REG_VID_CTRL) & 0x80) {
                        /*
                         * Set VID input sensibility if needed. In theory the
                         * BIOS should have set it, but in practice it's not
                         * always the case. We only do it for the W83627EHF/EHG
                         * because the W83627DHG is more complex in this
                         * respect.
                         */
                        if (sio_data->kind == w83627ehf) {
                                en_vrm10 = superio_inb(sio_data->sioreg,
                                                       SIO_REG_EN_VRM10);
                                if ((en_vrm10 & 0x08) && data->vrm == 90) {
                                        dev_warn(dev,
                                                 "Setting VID input voltage to TTL\n");
                                        superio_outb(sio_data->sioreg,
                                                     SIO_REG_EN_VRM10,
                                                     en_vrm10 & ~0x08);
                                } else if (!(en_vrm10 & 0x08)
                                           && data->vrm == 100) {
                                        dev_warn(dev,
                                                 "Setting VID input voltage to VRM10\n");
                                        superio_outb(sio_data->sioreg,
                                                     SIO_REG_EN_VRM10,
                                                     en_vrm10 | 0x08);
                                }
                        }

                        data->vid = superio_inb(sio_data->sioreg,
                                                SIO_REG_VID_DATA);
                        if (sio_data->kind == w83627ehf) /* 6 VID pins only */
                                data->vid &= 0x3f;
                        data->have_vid = true;
                } else {
                        dev_info(dev,
                                 "VID pins in output mode, CPU VID not available\n");
                }
        }

        w83627ehf_check_fan_inputs(sio_data, data);

        superio_exit(sio_data->sioreg);

        /* Read fan clock dividers immediately */
        w83627ehf_update_fan_div(data);

        /* Read pwm data to save original values */
        w83627ehf_update_pwm(data);
        for (i = 0; i < data->pwm_num; i++)
                data->pwm_enable_orig[i] = data->pwm_enable[i];

        hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev,
                                                         data->name,
                                                         data,
                                                         &w83627ehf_chip_info,
                                                         w83627ehf_groups);
        if (IS_ERR(hwmon_dev)) {
                err = PTR_ERR(hwmon_dev);
                goto exit_release;
        }

        return 0;

exit_release:
        release_region(res->start, IOREGION_LENGTH);
exit:
        return err;
}

static int w83627ehf_remove(struct platform_device *pdev)
{
        struct w83627ehf_data *data = platform_get_drvdata(pdev);

        release_region(data->addr, IOREGION_LENGTH);

        return 0;
}

#ifdef CONFIG_PM
static int w83627ehf_suspend(struct device *dev)
{
        struct w83627ehf_data *data = w83627ehf_update_device(dev);

        mutex_lock(&data->update_lock);
        data->vbat = w83627ehf_read_value(data, W83627EHF_REG_VBAT);
        mutex_unlock(&data->update_lock);

        return 0;
}

static int w83627ehf_resume(struct device *dev)
{
        struct w83627ehf_data *data = dev_get_drvdata(dev);
        int i;

        mutex_lock(&data->update_lock);
        data->bank = 0xff;              /* Force initial bank selection */

        /* Restore limits */
        for (i = 0; i < data->in_num; i++) {
                if ((i == 6) && data->in6_skip)
                        continue;

                w83627ehf_write_value(data, W83627EHF_REG_IN_MIN(i),
                                      data->in_min[i]);
                w83627ehf_write_value(data, W83627EHF_REG_IN_MAX(i),
                                      data->in_max[i]);
        }

        for (i = 0; i < 5; i++) {
                if (!(data->has_fan_min & (1 << i)))
                        continue;

                w83627ehf_write_value(data, W83627EHF_REG_FAN_MIN[i],
                                      data->fan_min[i]);
        }

        for (i = 0; i < NUM_REG_TEMP; i++) {
                if (!(data->have_temp & (1 << i)))
                        continue;

                if (data->reg_temp_over[i])
                        w83627ehf_write_temp(data, data->reg_temp_over[i],
                                             data->temp_max[i]);
                if (data->reg_temp_hyst[i])
                        w83627ehf_write_temp(data, data->reg_temp_hyst[i],
                                             data->temp_max_hyst[i]);
                if (i > 2)
                        continue;
                if (data->have_temp_offset & (1 << i))
                        w83627ehf_write_value(data,
                                              W83627EHF_REG_TEMP_OFFSET[i],
                                              data->temp_offset[i]);
        }

        /* Restore other settings */
        w83627ehf_write_value(data, W83627EHF_REG_VBAT, data->vbat);

        /* Force re-reading all values */
        data->valid = 0;
        mutex_unlock(&data->update_lock);

        return 0;
}

static const struct dev_pm_ops w83627ehf_dev_pm_ops = {
        .suspend = w83627ehf_suspend,
        .resume = w83627ehf_resume,
        .freeze = w83627ehf_suspend,
        .restore = w83627ehf_resume,
};

#define W83627EHF_DEV_PM_OPS    (&w83627ehf_dev_pm_ops)
#else
#define W83627EHF_DEV_PM_OPS    NULL
#endif /* CONFIG_PM */

static struct platform_driver w83627ehf_driver = {
        .driver = {
                .name   = DRVNAME,
                .pm     = W83627EHF_DEV_PM_OPS,
        },
        .probe          = w83627ehf_probe,
        .remove         = w83627ehf_remove,
};

/* w83627ehf_find() looks for a '627 in the Super-I/O config space */
static int __init w83627ehf_find(int sioaddr, unsigned short *addr,
                                 struct w83627ehf_sio_data *sio_data)
{
        static const char sio_name_W83627EHF[] __initconst = "W83627EHF";
        static const char sio_name_W83627EHG[] __initconst = "W83627EHG";
        static const char sio_name_W83627DHG[] __initconst = "W83627DHG";
        static const char sio_name_W83627DHG_P[] __initconst = "W83627DHG-P";
        static const char sio_name_W83627UHG[] __initconst = "W83627UHG";
        static const char sio_name_W83667HG[] __initconst = "W83667HG";
        static const char sio_name_W83667HG_B[] __initconst = "W83667HG-B";

        u16 val;
        const char *sio_name;
        int err;

        err = superio_enter(sioaddr);
        if (err)
                return err;

        if (force_id)
                val = force_id;
        else
                val = (superio_inb(sioaddr, SIO_REG_DEVID) << 8)
                    | superio_inb(sioaddr, SIO_REG_DEVID + 1);
        switch (val & SIO_ID_MASK) {
        case SIO_W83627EHF_ID:
                sio_data->kind = w83627ehf;
                sio_name = sio_name_W83627EHF;
                break;
        case SIO_W83627EHG_ID:
                sio_data->kind = w83627ehf;
                sio_name = sio_name_W83627EHG;
                break;
        case SIO_W83627DHG_ID:
                sio_data->kind = w83627dhg;
                sio_name = sio_name_W83627DHG;
                break;
        case SIO_W83627DHG_P_ID:
                sio_data->kind = w83627dhg_p;
                sio_name = sio_name_W83627DHG_P;
                break;
        case SIO_W83627UHG_ID:
                sio_data->kind = w83627uhg;
                sio_name = sio_name_W83627UHG;
                break;
        case SIO_W83667HG_ID:
                sio_data->kind = w83667hg;
                sio_name = sio_name_W83667HG;
                break;
        case SIO_W83667HG_B_ID:
                sio_data->kind = w83667hg_b;
                sio_name = sio_name_W83667HG_B;
                break;
        default:
                if (val != 0xffff)
                        pr_debug("unsupported chip ID: 0x%04x\n", val);
                superio_exit(sioaddr);
                return -ENODEV;
        }

        /* We have a known chip, find the HWM I/O address */
        superio_select(sioaddr, W83627EHF_LD_HWM);
        val = (superio_inb(sioaddr, SIO_REG_ADDR) << 8)
            | superio_inb(sioaddr, SIO_REG_ADDR + 1);
        *addr = val & IOREGION_ALIGNMENT;
        if (*addr == 0) {
                pr_err("Refusing to enable a Super-I/O device with a base I/O port 0\n");
                superio_exit(sioaddr);
                return -ENODEV;
        }

        /* Activate logical device if needed */
        val = superio_inb(sioaddr, SIO_REG_ENABLE);
        if (!(val & 0x01)) {
                pr_warn("Forcibly enabling Super-I/O. Sensor is probably unusable.\n");
                superio_outb(sioaddr, SIO_REG_ENABLE, val | 0x01);
        }

        superio_exit(sioaddr);
        pr_info("Found %s chip at %#x\n", sio_name, *addr);
        sio_data->sioreg = sioaddr;

        return 0;
}

/*
 * when Super-I/O functions move to a separate file, the Super-I/O
 * bus will manage the lifetime of the device and this module will only keep
 * track of the w83627ehf driver. But since we platform_device_alloc(), we
 * must keep track of the device
 */
static struct platform_device *pdev;

static int __init sensors_w83627ehf_init(void)
{
        int err;
        unsigned short address;
        struct resource res;
        struct w83627ehf_sio_data sio_data;

        /*
         * initialize sio_data->kind and sio_data->sioreg.
         *
         * when Super-I/O functions move to a separate file, the Super-I/O
         * driver will probe 0x2e and 0x4e and auto-detect the presence of a
         * w83627ehf hardware monitor, and call probe()
         */
        if (w83627ehf_find(0x2e, &address, &sio_data) &&
            w83627ehf_find(0x4e, &address, &sio_data))
                return -ENODEV;

        err = platform_driver_register(&w83627ehf_driver);
        if (err)
                goto exit;

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

        err = platform_device_add_data(pdev, &sio_data,
                                       sizeof(struct w83627ehf_sio_data));
        if (err) {
                pr_err("Platform data allocation failed\n");
                goto exit_device_put;
        }

        memset(&res, 0, sizeof(res));
        res.name = DRVNAME;
        res.start = address + IOREGION_OFFSET;
        res.end = address + IOREGION_OFFSET + IOREGION_LENGTH - 1;
        res.flags = IORESOURCE_IO;

        err = acpi_check_resource_conflict(&res);
        if (err)
                goto exit_device_put;

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

        /* platform_device_add calls probe() */
        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_unregister:
        platform_driver_unregister(&w83627ehf_driver);
exit:
        return err;
}

static void __exit sensors_w83627ehf_exit(void)
{
        platform_device_unregister(pdev);
        platform_driver_unregister(&w83627ehf_driver);
}

MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
MODULE_DESCRIPTION("W83627EHF driver");
MODULE_LICENSE("GPL");

module_init(sensors_w83627ehf_init);
module_exit(sensors_w83627ehf_exit);