/*
 *  it87.c - Part of lm_sensors, Linux kernel modules for hardware
 *           monitoring.
 *
 *  The IT8705F is an LPC-based Super I/O part that contains UARTs, a
 *  parallel port, an IR port, a MIDI port, a floppy controller, etc., in
 *  addition to an Environment Controller (Enhanced Hardware Monitor and
 *  Fan Controller)
 *
 *  This driver supports only the Environment Controller in the IT8705F and
 *  similar parts.  The other devices are supported by different drivers.
 *
 *  Supports: IT8603E  Super I/O chip w/LPC interface
 *            IT8620E  Super I/O chip w/LPC interface
 *            IT8622E  Super I/O chip w/LPC interface
 *            IT8623E  Super I/O chip w/LPC interface
 *            IT8628E  Super I/O chip w/LPC interface
 *            IT8705F  Super I/O chip w/LPC interface
 *            IT8712F  Super I/O chip w/LPC interface
 *            IT8716F  Super I/O chip w/LPC interface
 *            IT8718F  Super I/O chip w/LPC interface
 *            IT8720F  Super I/O chip w/LPC interface
 *            IT8721F  Super I/O chip w/LPC interface
 *            IT8726F  Super I/O chip w/LPC interface
 *            IT8728F  Super I/O chip w/LPC interface
 *            IT8732F  Super I/O chip w/LPC interface
 *            IT8758E  Super I/O chip w/LPC interface
 *            IT8771E  Super I/O chip w/LPC interface
 *            IT8772E  Super I/O chip w/LPC interface
 *            IT8781F  Super I/O chip w/LPC interface
 *            IT8782F  Super I/O chip w/LPC interface
 *            IT8783E/F Super I/O chip w/LPC interface
 *            IT8786E  Super I/O chip w/LPC interface
 *            IT8790E  Super I/O chip w/LPC interface
 *            IT8792E  Super I/O chip w/LPC interface
 *            Sis950   A clone of the IT8705F
 *
 *  Copyright (C) 2001 Chris Gauthron
 *  Copyright (C) 2005-2010 Jean Delvare <jdelvare@suse.de>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/bitops.h>
#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/sysfs.h>
#include <linux/string.h>
#include <linux/dmi.h>
#include <linux/acpi.h>
#include <linux/io.h>

#define DRVNAME "it87"

enum chips { it87, it8712, it8716, it8718, it8720, it8721, it8728, it8732,
             it8771, it8772, it8781, it8782, it8783, it8786, it8790,
             it8792, it8603, it8620, it8622, it8628 };

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

static struct platform_device *it87_pdev[2];

#define REG_2E  0x2e    /* The register to read/write */
#define REG_4E  0x4e    /* Secondary register to read/write */

#define DEV     0x07    /* Register: Logical device select */
#define PME     0x04    /* The device with the fan registers in it */

/* The device with the IT8718F/IT8720F VID value in it */
#define GPIO    0x07

#define DEVID   0x20    /* Register: Device ID */
#define DEVREV  0x22    /* Register: Device Revision */

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

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

static int superio_inw(int ioreg, int reg)
{
        int val;

        outb(reg++, ioreg);
        val = inb(ioreg + 1) << 8;
        outb(reg, ioreg);
        val |= inb(ioreg + 1);
        return val;
}

static inline void superio_select(int ioreg, int ldn)
{
        outb(DEV, ioreg);
        outb(ldn, ioreg + 1);
}

static inline int superio_enter(int ioreg)
{
        /*
         * Try to reserve ioreg and ioreg + 1 for exclusive access.
         */
        if (!request_muxed_region(ioreg, 2, DRVNAME))
                return -EBUSY;

        outb(0x87, ioreg);
        outb(0x01, ioreg);
        outb(0x55, ioreg);
        outb(ioreg == REG_4E ? 0xaa : 0x55, ioreg);
        return 0;
}

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

/* Logical device 4 registers */
#define IT8712F_DEVID 0x8712
#define IT8705F_DEVID 0x8705
#define IT8716F_DEVID 0x8716
#define IT8718F_DEVID 0x8718
#define IT8720F_DEVID 0x8720
#define IT8721F_DEVID 0x8721
#define IT8726F_DEVID 0x8726
#define IT8728F_DEVID 0x8728
#define IT8732F_DEVID 0x8732
#define IT8792E_DEVID 0x8733
#define IT8771E_DEVID 0x8771
#define IT8772E_DEVID 0x8772
#define IT8781F_DEVID 0x8781
#define IT8782F_DEVID 0x8782
#define IT8783E_DEVID 0x8783
#define IT8786E_DEVID 0x8786
#define IT8790E_DEVID 0x8790
#define IT8603E_DEVID 0x8603
#define IT8620E_DEVID 0x8620
#define IT8622E_DEVID 0x8622
#define IT8623E_DEVID 0x8623
#define IT8628E_DEVID 0x8628
#define IT87_ACT_REG  0x30
#define IT87_BASE_REG 0x60

/* Logical device 7 registers (IT8712F and later) */
#define IT87_SIO_GPIO1_REG      0x25
#define IT87_SIO_GPIO2_REG      0x26
#define IT87_SIO_GPIO3_REG      0x27
#define IT87_SIO_GPIO4_REG      0x28
#define IT87_SIO_GPIO5_REG      0x29
#define IT87_SIO_PINX1_REG      0x2a    /* Pin selection */
#define IT87_SIO_PINX2_REG      0x2c    /* Pin selection */
#define IT87_SIO_SPI_REG        0xef    /* SPI function pin select */
#define IT87_SIO_VID_REG        0xfc    /* VID value */
#define IT87_SIO_BEEP_PIN_REG   0xf6    /* Beep pin mapping */

/* Update battery voltage after every reading if true */
static bool update_vbat;

/* Not all BIOSes properly configure the PWM registers */
static bool fix_pwm_polarity;

/* Many IT87 constants specified below */

/* Length of ISA address segment */
#define IT87_EXTENT 8

/* Length of ISA address segment for Environmental Controller */
#define IT87_EC_EXTENT 2

/* Offset of EC registers from ISA base address */
#define IT87_EC_OFFSET 5

/* Where are the ISA address/data registers relative to the EC base address */
#define IT87_ADDR_REG_OFFSET 0
#define IT87_DATA_REG_OFFSET 1

/*----- The IT87 registers -----*/

#define IT87_REG_CONFIG        0x00

#define IT87_REG_ALARM1        0x01
#define IT87_REG_ALARM2        0x02
#define IT87_REG_ALARM3        0x03

/*
 * The IT8718F and IT8720F have the VID value in a different register, in
 * Super-I/O configuration space.
 */
#define IT87_REG_VID           0x0a
/*
 * The IT8705F and IT8712F earlier than revision 0x08 use register 0x0b
 * for fan divisors. Later IT8712F revisions must use 16-bit tachometer
 * mode.
 */
#define IT87_REG_FAN_DIV       0x0b
#define IT87_REG_FAN_16BIT     0x0c

/*
 * Monitors:
 * - up to 13 voltage (0 to 7, battery, avcc, 10 to 12)
 * - up to 6 temp (1 to 6)
 * - up to 6 fan (1 to 6)
 */

static const u8 IT87_REG_FAN[]         = { 0x0d, 0x0e, 0x0f, 0x80, 0x82, 0x4c };
static const u8 IT87_REG_FAN_MIN[]     = { 0x10, 0x11, 0x12, 0x84, 0x86, 0x4e };
static const u8 IT87_REG_FANX[]        = { 0x18, 0x19, 0x1a, 0x81, 0x83, 0x4d };
static const u8 IT87_REG_FANX_MIN[]    = { 0x1b, 0x1c, 0x1d, 0x85, 0x87, 0x4f };
static const u8 IT87_REG_TEMP_OFFSET[] = { 0x56, 0x57, 0x59 };

#define IT87_REG_FAN_MAIN_CTRL 0x13
#define IT87_REG_FAN_CTL       0x14
static const u8 IT87_REG_PWM[]         = { 0x15, 0x16, 0x17, 0x7f, 0xa7, 0xaf };
static const u8 IT87_REG_PWM_DUTY[]    = { 0x63, 0x6b, 0x73, 0x7b, 0xa3, 0xab };

static const u8 IT87_REG_VIN[]  = { 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26,
                                    0x27, 0x28, 0x2f, 0x2c, 0x2d, 0x2e };

#define IT87_REG_TEMP(nr)      (0x29 + (nr))

#define IT87_REG_VIN_MAX(nr)   (0x30 + (nr) * 2)
#define IT87_REG_VIN_MIN(nr)   (0x31 + (nr) * 2)
#define IT87_REG_TEMP_HIGH(nr) (0x40 + (nr) * 2)
#define IT87_REG_TEMP_LOW(nr)  (0x41 + (nr) * 2)

#define IT87_REG_VIN_ENABLE    0x50
#define IT87_REG_TEMP_ENABLE   0x51
#define IT87_REG_TEMP_EXTRA    0x55
#define IT87_REG_BEEP_ENABLE   0x5c

#define IT87_REG_CHIPID        0x58

static const u8 IT87_REG_AUTO_BASE[] = { 0x60, 0x68, 0x70, 0x78, 0xa0, 0xa8 };

#define IT87_REG_AUTO_TEMP(nr, i) (IT87_REG_AUTO_BASE[nr] + (i))
#define IT87_REG_AUTO_PWM(nr, i)  (IT87_REG_AUTO_BASE[nr] + 5 + (i))

#define IT87_REG_TEMP456_ENABLE 0x77

#define NUM_VIN                 ARRAY_SIZE(IT87_REG_VIN)
#define NUM_VIN_LIMIT           8
#define NUM_TEMP                6
#define NUM_TEMP_OFFSET         ARRAY_SIZE(IT87_REG_TEMP_OFFSET)
#define NUM_TEMP_LIMIT          3
#define NUM_FAN                 ARRAY_SIZE(IT87_REG_FAN)
#define NUM_FAN_DIV             3
#define NUM_PWM                 ARRAY_SIZE(IT87_REG_PWM)
#define NUM_AUTO_PWM            ARRAY_SIZE(IT87_REG_PWM)

struct it87_devices {
        const char *name;
        const char * const suffix;
        u32 features;
        u8 peci_mask;
        u8 old_peci_mask;
};

#define FEAT_12MV_ADC           BIT(0)
#define FEAT_NEWER_AUTOPWM      BIT(1)
#define FEAT_OLD_AUTOPWM        BIT(2)
#define FEAT_16BIT_FANS         BIT(3)
#define FEAT_TEMP_OFFSET        BIT(4)
#define FEAT_TEMP_PECI          BIT(5)
#define FEAT_TEMP_OLD_PECI      BIT(6)
#define FEAT_FAN16_CONFIG       BIT(7)  /* Need to enable 16-bit fans */
#define FEAT_FIVE_FANS          BIT(8)  /* Supports five fans */
#define FEAT_VID                BIT(9)  /* Set if chip supports VID */
#define FEAT_IN7_INTERNAL       BIT(10) /* Set if in7 is internal */
#define FEAT_SIX_FANS           BIT(11) /* Supports six fans */
#define FEAT_10_9MV_ADC         BIT(12)
#define FEAT_AVCC3              BIT(13) /* Chip supports in9/AVCC3 */
#define FEAT_FIVE_PWM           BIT(14) /* Chip supports 5 pwm chn */
#define FEAT_SIX_PWM            BIT(15) /* Chip supports 6 pwm chn */
#define FEAT_PWM_FREQ2          BIT(16) /* Separate pwm freq 2 */
#define FEAT_SIX_TEMP           BIT(17) /* Up to 6 temp sensors */
#define FEAT_VIN3_5V            BIT(18) /* VIN3 connected to +5V */

static const struct it87_devices it87_devices[] = {
        [it87] = {
                .name = "it87",
                .suffix = "F",
                .features = FEAT_OLD_AUTOPWM,   /* may need to overwrite */
        },
        [it8712] = {
                .name = "it8712",
                .suffix = "F",
                .features = FEAT_OLD_AUTOPWM | FEAT_VID,
                                                /* may need to overwrite */
        },
        [it8716] = {
                .name = "it8716",
                .suffix = "F",
                .features = FEAT_16BIT_FANS | FEAT_TEMP_OFFSET | FEAT_VID
                  | FEAT_FAN16_CONFIG | FEAT_FIVE_FANS | FEAT_PWM_FREQ2,
        },
        [it8718] = {
                .name = "it8718",
                .suffix = "F",
                .features = FEAT_16BIT_FANS | FEAT_TEMP_OFFSET | FEAT_VID
                  | FEAT_TEMP_OLD_PECI | FEAT_FAN16_CONFIG | FEAT_FIVE_FANS
                  | FEAT_PWM_FREQ2,
                .old_peci_mask = 0x4,
        },
        [it8720] = {
                .name = "it8720",
                .suffix = "F",
                .features = FEAT_16BIT_FANS | FEAT_TEMP_OFFSET | FEAT_VID
                  | FEAT_TEMP_OLD_PECI | FEAT_FAN16_CONFIG | FEAT_FIVE_FANS
                  | FEAT_PWM_FREQ2,
                .old_peci_mask = 0x4,
        },
        [it8721] = {
                .name = "it8721",
                .suffix = "F",
                .features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
                  | FEAT_TEMP_OFFSET | FEAT_TEMP_OLD_PECI | FEAT_TEMP_PECI
                  | FEAT_FAN16_CONFIG | FEAT_FIVE_FANS | FEAT_IN7_INTERNAL
                  | FEAT_PWM_FREQ2,
                .peci_mask = 0x05,
                .old_peci_mask = 0x02,  /* Actually reports PCH */
        },
        [it8728] = {
                .name = "it8728",
                .suffix = "F",
                .features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
                  | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI | FEAT_FIVE_FANS
                  | FEAT_IN7_INTERNAL | FEAT_PWM_FREQ2,
                .peci_mask = 0x07,
        },
        [it8732] = {
                .name = "it8732",
                .suffix = "F",
                .features = FEAT_NEWER_AUTOPWM | FEAT_16BIT_FANS
                  | FEAT_TEMP_OFFSET | FEAT_TEMP_OLD_PECI | FEAT_TEMP_PECI
                  | FEAT_10_9MV_ADC | FEAT_IN7_INTERNAL,
                .peci_mask = 0x07,
                .old_peci_mask = 0x02,  /* Actually reports PCH */
        },
        [it8771] = {
                .name = "it8771",
                .suffix = "E",
                .features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
                  | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI | FEAT_IN7_INTERNAL
                  | FEAT_PWM_FREQ2,
                                /* PECI: guesswork */
                                /* 12mV ADC (OHM) */
                                /* 16 bit fans (OHM) */
                                /* three fans, always 16 bit (guesswork) */
                .peci_mask = 0x07,
        },
        [it8772] = {
                .name = "it8772",
                .suffix = "E",
                .features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
                  | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI | FEAT_IN7_INTERNAL
                  | FEAT_PWM_FREQ2,
                                /* PECI (coreboot) */
                                /* 12mV ADC (HWSensors4, OHM) */
                                /* 16 bit fans (HWSensors4, OHM) */
                                /* three fans, always 16 bit (datasheet) */
                .peci_mask = 0x07,
        },
        [it8781] = {
                .name = "it8781",
                .suffix = "F",
                .features = FEAT_16BIT_FANS | FEAT_TEMP_OFFSET
                  | FEAT_TEMP_OLD_PECI | FEAT_FAN16_CONFIG | FEAT_PWM_FREQ2,
                .old_peci_mask = 0x4,
        },
        [it8782] = {
                .name = "it8782",
                .suffix = "F",
                .features = FEAT_16BIT_FANS | FEAT_TEMP_OFFSET
                  | FEAT_TEMP_OLD_PECI | FEAT_FAN16_CONFIG | FEAT_PWM_FREQ2,
                .old_peci_mask = 0x4,
        },
        [it8783] = {
                .name = "it8783",
                .suffix = "E/F",
                .features = FEAT_16BIT_FANS | FEAT_TEMP_OFFSET
                  | FEAT_TEMP_OLD_PECI | FEAT_FAN16_CONFIG | FEAT_PWM_FREQ2,
                .old_peci_mask = 0x4,
        },
        [it8786] = {
                .name = "it8786",
                .suffix = "E",
                .features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
                  | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI | FEAT_IN7_INTERNAL
                  | FEAT_PWM_FREQ2,
                .peci_mask = 0x07,
        },
        [it8790] = {
                .name = "it8790",
                .suffix = "E",
                .features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
                  | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI | FEAT_IN7_INTERNAL
                  | FEAT_PWM_FREQ2,
                .peci_mask = 0x07,
        },
        [it8792] = {
                .name = "it8792",
                .suffix = "E",
                .features = FEAT_NEWER_AUTOPWM | FEAT_16BIT_FANS
                  | FEAT_TEMP_OFFSET | FEAT_TEMP_OLD_PECI | FEAT_TEMP_PECI
                  | FEAT_10_9MV_ADC | FEAT_IN7_INTERNAL,
                .peci_mask = 0x07,
                .old_peci_mask = 0x02,  /* Actually reports PCH */
        },
        [it8603] = {
                .name = "it8603",
                .suffix = "E",
                .features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
                  | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI | FEAT_IN7_INTERNAL
                  | FEAT_AVCC3 | FEAT_PWM_FREQ2,
                .peci_mask = 0x07,
        },
        [it8620] = {
                .name = "it8620",
                .suffix = "E",
                .features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
                  | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI | FEAT_SIX_FANS
                  | FEAT_IN7_INTERNAL | FEAT_SIX_PWM | FEAT_PWM_FREQ2
                  | FEAT_SIX_TEMP | FEAT_VIN3_5V,
                .peci_mask = 0x07,
        },
        [it8622] = {
                .name = "it8622",
                .suffix = "E",
                .features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
                  | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI | FEAT_FIVE_FANS
                  | FEAT_FIVE_PWM | FEAT_IN7_INTERNAL | FEAT_PWM_FREQ2
                  | FEAT_AVCC3 | FEAT_VIN3_5V,
                .peci_mask = 0x07,
        },
        [it8628] = {
                .name = "it8628",
                .suffix = "E",
                .features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
                  | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI | FEAT_SIX_FANS
                  | FEAT_IN7_INTERNAL | FEAT_SIX_PWM | FEAT_PWM_FREQ2
                  | FEAT_SIX_TEMP | FEAT_VIN3_5V,
                .peci_mask = 0x07,
        },
};

#define has_16bit_fans(data)    ((data)->features & FEAT_16BIT_FANS)
#define has_12mv_adc(data)      ((data)->features & FEAT_12MV_ADC)
#define has_10_9mv_adc(data)    ((data)->features & FEAT_10_9MV_ADC)
#define has_newer_autopwm(data) ((data)->features & FEAT_NEWER_AUTOPWM)
#define has_old_autopwm(data)   ((data)->features & FEAT_OLD_AUTOPWM)
#define has_temp_offset(data)   ((data)->features & FEAT_TEMP_OFFSET)
#define has_temp_peci(data, nr) (((data)->features & FEAT_TEMP_PECI) && \
                                 ((data)->peci_mask & BIT(nr)))
#define has_temp_old_peci(data, nr) \
                                (((data)->features & FEAT_TEMP_OLD_PECI) && \
                                 ((data)->old_peci_mask & BIT(nr)))
#define has_fan16_config(data)  ((data)->features & FEAT_FAN16_CONFIG)
#define has_five_fans(data)     ((data)->features & (FEAT_FIVE_FANS | \
                                                     FEAT_SIX_FANS))
#define has_vid(data)           ((data)->features & FEAT_VID)
#define has_in7_internal(data)  ((data)->features & FEAT_IN7_INTERNAL)
#define has_six_fans(data)      ((data)->features & FEAT_SIX_FANS)
#define has_avcc3(data)         ((data)->features & FEAT_AVCC3)
#define has_five_pwm(data)      ((data)->features & (FEAT_FIVE_PWM \
                                                     | FEAT_SIX_PWM))
#define has_six_pwm(data)       ((data)->features & FEAT_SIX_PWM)
#define has_pwm_freq2(data)     ((data)->features & FEAT_PWM_FREQ2)
#define has_six_temp(data)      ((data)->features & FEAT_SIX_TEMP)
#define has_vin3_5v(data)       ((data)->features & FEAT_VIN3_5V)

struct it87_sio_data {
        int sioaddr;
        enum chips type;
        /* Values read from Super-I/O config space */
        u8 revision;
        u8 vid_value;
        u8 beep_pin;
        u8 internal;    /* Internal sensors can be labeled */
        bool need_in7_reroute;
        /* Features skipped based on config or DMI */
        u16 skip_in;
        u8 skip_vid;
        u8 skip_fan;
        u8 skip_pwm;
        u8 skip_temp;
};

/*
 * For each registered chip, we need to keep some data in memory.
 * The structure is dynamically allocated.
 */
struct it87_data {
        const struct attribute_group *groups[7];
        int sioaddr;
        enum chips type;
        u32 features;
        u8 peci_mask;
        u8 old_peci_mask;

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

        u16 in_scaled;          /* Internal voltage sensors are scaled */
        u16 in_internal;        /* Bitfield, internal sensors (for labels) */
        u16 has_in;             /* Bitfield, voltage sensors enabled */
        u8 in[NUM_VIN][3];              /* [nr][0]=in, [1]=min, [2]=max */
        bool need_in7_reroute;
        u8 has_fan;             /* Bitfield, fans enabled */
        u16 fan[NUM_FAN][2];    /* Register values, [nr][0]=fan, [1]=min */
        u8 has_temp;            /* Bitfield, temp sensors enabled */
        s8 temp[NUM_TEMP][4];   /* [nr][0]=temp, [1]=min, [2]=max, [3]=offset */
        u8 sensor;              /* Register value (IT87_REG_TEMP_ENABLE) */
        u8 extra;               /* Register value (IT87_REG_TEMP_EXTRA) */
        u8 fan_div[NUM_FAN_DIV];/* Register encoding, shifted right */
        bool has_vid;           /* True if VID supported */
        u8 vid;                 /* Register encoding, combined */
        u8 vrm;
        u32 alarms;             /* Register encoding, combined */
        bool has_beep;          /* true if beep supported */
        u8 beeps;               /* Register encoding */
        u8 fan_main_ctrl;       /* Register value */
        u8 fan_ctl;             /* Register value */

        /*
         * The following 3 arrays correspond to the same registers up to
         * the IT8720F. The meaning of bits 6-0 depends on the value of bit
         * 7, and we want to preserve settings on mode changes, so we have
         * to track all values separately.
         * Starting with the IT8721F, the manual PWM duty cycles are stored
         * in separate registers (8-bit values), so the separate tracking
         * is no longer needed, but it is still done to keep the driver
         * simple.
         */
        u8 has_pwm;             /* Bitfield, pwm control enabled */
        u8 pwm_ctrl[NUM_PWM];   /* Register value */
        u8 pwm_duty[NUM_PWM];   /* Manual PWM value set by user */
        u8 pwm_temp_map[NUM_PWM];/* PWM to temp. chan. mapping (bits 1-0) */

        /* Automatic fan speed control registers */
        u8 auto_pwm[NUM_AUTO_PWM][4];   /* [nr][3] is hard-coded */
        s8 auto_temp[NUM_AUTO_PWM][5];  /* [nr][0] is point1_temp_hyst */
};

static int adc_lsb(const struct it87_data *data, int nr)
{
        int lsb;

        if (has_12mv_adc(data))
                lsb = 120;
        else if (has_10_9mv_adc(data))
                lsb = 109;
        else
                lsb = 160;
        if (data->in_scaled & BIT(nr))
                lsb <<= 1;
        return lsb;
}

static u8 in_to_reg(const struct it87_data *data, int nr, long val)
{
        val = DIV_ROUND_CLOSEST(val * 10, adc_lsb(data, nr));
        return clamp_val(val, 0, 255);
}

static int in_from_reg(const struct it87_data *data, int nr, int val)
{
        return DIV_ROUND_CLOSEST(val * adc_lsb(data, nr), 10);
}

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

static inline u16 FAN16_TO_REG(long rpm)
{
        if (rpm == 0)
                return 0xffff;
        return clamp_val((1350000 + rpm) / (rpm * 2), 1, 0xfffe);
}

#define FAN_FROM_REG(val, div) ((val) == 0 ? -1 : (val) == 255 ? 0 : \
                                1350000 / ((val) * (div)))
/* The divider is fixed to 2 in 16-bit mode */
#define FAN16_FROM_REG(val) ((val) == 0 ? -1 : (val) == 0xffff ? 0 : \
                             1350000 / ((val) * 2))

#define TEMP_TO_REG(val) (clamp_val(((val) < 0 ? (((val) - 500) / 1000) : \
                                    ((val) + 500) / 1000), -128, 127))
#define TEMP_FROM_REG(val) ((val) * 1000)

static u8 pwm_to_reg(const struct it87_data *data, long val)
{
        if (has_newer_autopwm(data))
                return val;
        else
                return val >> 1;
}

static int pwm_from_reg(const struct it87_data *data, u8 reg)
{
        if (has_newer_autopwm(data))
                return reg;
        else
                return (reg & 0x7f) << 1;
}

static int DIV_TO_REG(int val)
{
        int answer = 0;

        while (answer < 7 && (val >>= 1))
                answer++;
        return answer;
}

#define DIV_FROM_REG(val) BIT(val)

/*
 * PWM base frequencies. The frequency has to be divided by either 128 or 256,
 * depending on the chip type, to calculate the actual PWM frequency.
 *
 * Some of the chip datasheets suggest a base frequency of 51 kHz instead
 * of 750 kHz for the slowest base frequency, resulting in a PWM frequency
 * of 200 Hz. Sometimes both PWM frequency select registers are affected,
 * sometimes just one. It is unknown if this is a datasheet error or real,
 * so this is ignored for now.
 */
static const unsigned int pwm_freq[8] = {
        48000000,
        24000000,
        12000000,
        8000000,
        6000000,
        3000000,
        1500000,
        750000,
};

/*
 * Must be called with data->update_lock held, except during initialization.
 * We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
 * would slow down the IT87 access and should not be necessary.
 */
static int it87_read_value(struct it87_data *data, u8 reg)
{
        outb_p(reg, data->addr + IT87_ADDR_REG_OFFSET);
        return inb_p(data->addr + IT87_DATA_REG_OFFSET);
}

/*
 * Must be called with data->update_lock held, except during initialization.
 * We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
 * would slow down the IT87 access and should not be necessary.
 */
static void it87_write_value(struct it87_data *data, u8 reg, u8 value)
{
        outb_p(reg, data->addr + IT87_ADDR_REG_OFFSET);
        outb_p(value, data->addr + IT87_DATA_REG_OFFSET);
}

static void it87_update_pwm_ctrl(struct it87_data *data, int nr)
{
        data->pwm_ctrl[nr] = it87_read_value(data, IT87_REG_PWM[nr]);
        if (has_newer_autopwm(data)) {
                data->pwm_temp_map[nr] = data->pwm_ctrl[nr] & 0x03;
                data->pwm_duty[nr] = it87_read_value(data,
                                                     IT87_REG_PWM_DUTY[nr]);
        } else {
                if (data->pwm_ctrl[nr] & 0x80)  /* Automatic mode */
                        data->pwm_temp_map[nr] = data->pwm_ctrl[nr] & 0x03;
                else                            /* Manual mode */
                        data->pwm_duty[nr] = data->pwm_ctrl[nr] & 0x7f;
        }

        if (has_old_autopwm(data)) {
                int i;

                for (i = 0; i < 5 ; i++)
                        data->auto_temp[nr][i] = it87_read_value(data,
                                                IT87_REG_AUTO_TEMP(nr, i));
                for (i = 0; i < 3 ; i++)
                        data->auto_pwm[nr][i] = it87_read_value(data,
                                                IT87_REG_AUTO_PWM(nr, i));
        } else if (has_newer_autopwm(data)) {
                int i;

                /*
                 * 0: temperature hysteresis (base + 5)
                 * 1: fan off temperature (base + 0)
                 * 2: fan start temperature (base + 1)
                 * 3: fan max temperature (base + 2)
                 */
                data->auto_temp[nr][0] =
                        it87_read_value(data, IT87_REG_AUTO_TEMP(nr, 5));

                for (i = 0; i < 3 ; i++)
                        data->auto_temp[nr][i + 1] =
                                it87_read_value(data,
                                                IT87_REG_AUTO_TEMP(nr, i));
                /*
                 * 0: start pwm value (base + 3)
                 * 1: pwm slope (base + 4, 1/8th pwm)
                 */
                data->auto_pwm[nr][0] =
                        it87_read_value(data, IT87_REG_AUTO_TEMP(nr, 3));
                data->auto_pwm[nr][1] =
                        it87_read_value(data, IT87_REG_AUTO_TEMP(nr, 4));
        }
}

static struct it87_data *it87_update_device(struct device *dev)
{
        struct it87_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) {
                if (update_vbat) {
                        /*
                         * Cleared after each update, so reenable.  Value
                         * returned by this read will be previous value
                         */
                        it87_write_value(data, IT87_REG_CONFIG,
                                it87_read_value(data, IT87_REG_CONFIG) | 0x40);
                }
                for (i = 0; i < NUM_VIN; i++) {
                        if (!(data->has_in & BIT(i)))
                                continue;

                        data->in[i][0] =
                                it87_read_value(data, IT87_REG_VIN[i]);

                        /* VBAT and AVCC don't have limit registers */
                        if (i >= NUM_VIN_LIMIT)
                                continue;

                        data->in[i][1] =
                                it87_read_value(data, IT87_REG_VIN_MIN(i));
                        data->in[i][2] =
                                it87_read_value(data, IT87_REG_VIN_MAX(i));
                }

                for (i = 0; i < NUM_FAN; i++) {
                        /* Skip disabled fans */
                        if (!(data->has_fan & BIT(i)))
                                continue;

                        data->fan[i][1] =
                                it87_read_value(data, IT87_REG_FAN_MIN[i]);
                        data->fan[i][0] = it87_read_value(data,
                                       IT87_REG_FAN[i]);
                        /* Add high byte if in 16-bit mode */
                        if (has_16bit_fans(data)) {
                                data->fan[i][0] |= it87_read_value(data,
                                                IT87_REG_FANX[i]) << 8;
                                data->fan[i][1] |= it87_read_value(data,
                                                IT87_REG_FANX_MIN[i]) << 8;
                        }
                }
                for (i = 0; i < NUM_TEMP; i++) {
                        if (!(data->has_temp & BIT(i)))
                                continue;
                        data->temp[i][0] =
                                it87_read_value(data, IT87_REG_TEMP(i));

                        if (has_temp_offset(data) && i < NUM_TEMP_OFFSET)
                                data->temp[i][3] =
                                  it87_read_value(data,
                                                  IT87_REG_TEMP_OFFSET[i]);

                        if (i >= NUM_TEMP_LIMIT)
                                continue;

                        data->temp[i][1] =
                                it87_read_value(data, IT87_REG_TEMP_LOW(i));
                        data->temp[i][2] =
                                it87_read_value(data, IT87_REG_TEMP_HIGH(i));
                }

                /* Newer chips don't have clock dividers */
                if ((data->has_fan & 0x07) && !has_16bit_fans(data)) {
                        i = it87_read_value(data, IT87_REG_FAN_DIV);
                        data->fan_div[0] = i & 0x07;
                        data->fan_div[1] = (i >> 3) & 0x07;
                        data->fan_div[2] = (i & 0x40) ? 3 : 1;
                }

                data->alarms =
                        it87_read_value(data, IT87_REG_ALARM1) |
                        (it87_read_value(data, IT87_REG_ALARM2) << 8) |
                        (it87_read_value(data, IT87_REG_ALARM3) << 16);
                data->beeps = it87_read_value(data, IT87_REG_BEEP_ENABLE);

                data->fan_main_ctrl = it87_read_value(data,
                                IT87_REG_FAN_MAIN_CTRL);
                data->fan_ctl = it87_read_value(data, IT87_REG_FAN_CTL);
                for (i = 0; i < NUM_PWM; i++) {
                        if (!(data->has_pwm & BIT(i)))
                                continue;
                        it87_update_pwm_ctrl(data, i);
                }

                data->sensor = it87_read_value(data, IT87_REG_TEMP_ENABLE);
                data->extra = it87_read_value(data, IT87_REG_TEMP_EXTRA);
                /*
                 * The IT8705F does not have VID capability.
                 * The IT8718F and later don't use IT87_REG_VID for the
                 * same purpose.
                 */
                if (data->type == it8712 || data->type == it8716) {
                        data->vid = it87_read_value(data, IT87_REG_VID);
                        /*
                         * The older IT8712F revisions had only 5 VID pins,
                         * but we assume it is always safe to read 6 bits.
                         */
                        data->vid &= 0x3f;
                }
                data->last_updated = jiffies;
                data->valid = 1;
        }

        mutex_unlock(&data->update_lock);

        return data;
}

static ssize_t show_in(struct device *dev, struct device_attribute *attr,
                       char *buf)
{
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        struct it87_data *data = it87_update_device(dev);
        int index = sattr->index;
        int nr = sattr->nr;

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

static ssize_t set_in(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 it87_data *data = dev_get_drvdata(dev);
        int index = sattr->index;
        int nr = sattr->nr;
        unsigned long val;

        if (kstrtoul(buf, 10, &val) < 0)
                return -EINVAL;

        mutex_lock(&data->update_lock);
        data->in[nr][index] = in_to_reg(data, nr, val);
        it87_write_value(data,
                         index == 1 ? IT87_REG_VIN_MIN(nr)
                                    : IT87_REG_VIN_MAX(nr),
                         data->in[nr][index]);
        mutex_unlock(&data->update_lock);
        return count;
}

static SENSOR_DEVICE_ATTR_2(in0_input, S_IRUGO, show_in, NULL, 0, 0);
static SENSOR_DEVICE_ATTR_2(in0_min, S_IRUGO | S_IWUSR, show_in, set_in,
                            0, 1);
static SENSOR_DEVICE_ATTR_2(in0_max, S_IRUGO | S_IWUSR, show_in, set_in,
                            0, 2);

static SENSOR_DEVICE_ATTR_2(in1_input, S_IRUGO, show_in, NULL, 1, 0);
static SENSOR_DEVICE_ATTR_2(in1_min, S_IRUGO | S_IWUSR, show_in, set_in,
                            1, 1);
static SENSOR_DEVICE_ATTR_2(in1_max, S_IRUGO | S_IWUSR, show_in, set_in,
                            1, 2);

static SENSOR_DEVICE_ATTR_2(in2_input, S_IRUGO, show_in, NULL, 2, 0);
static SENSOR_DEVICE_ATTR_2(in2_min, S_IRUGO | S_IWUSR, show_in, set_in,
                            2, 1);
static SENSOR_DEVICE_ATTR_2(in2_max, S_IRUGO | S_IWUSR, show_in, set_in,
                            2, 2);

static SENSOR_DEVICE_ATTR_2(in3_input, S_IRUGO, show_in, NULL, 3, 0);
static SENSOR_DEVICE_ATTR_2(in3_min, S_IRUGO | S_IWUSR, show_in, set_in,
                            3, 1);
static SENSOR_DEVICE_ATTR_2(in3_max, S_IRUGO | S_IWUSR, show_in, set_in,
                            3, 2);

static SENSOR_DEVICE_ATTR_2(in4_input, S_IRUGO, show_in, NULL, 4, 0);
static SENSOR_DEVICE_ATTR_2(in4_min, S_IRUGO | S_IWUSR, show_in, set_in,
                            4, 1);
static SENSOR_DEVICE_ATTR_2(in4_max, S_IRUGO | S_IWUSR, show_in, set_in,
                            4, 2);

static SENSOR_DEVICE_ATTR_2(in5_input, S_IRUGO, show_in, NULL, 5, 0);
static SENSOR_DEVICE_ATTR_2(in5_min, S_IRUGO | S_IWUSR, show_in, set_in,
                            5, 1);
static SENSOR_DEVICE_ATTR_2(in5_max, S_IRUGO | S_IWUSR, show_in, set_in,
                            5, 2);

static SENSOR_DEVICE_ATTR_2(in6_input, S_IRUGO, show_in, NULL, 6, 0);
static SENSOR_DEVICE_ATTR_2(in6_min, S_IRUGO | S_IWUSR, show_in, set_in,
                            6, 1);
static SENSOR_DEVICE_ATTR_2(in6_max, S_IRUGO | S_IWUSR, show_in, set_in,
                            6, 2);

static SENSOR_DEVICE_ATTR_2(in7_input, S_IRUGO, show_in, NULL, 7, 0);
static SENSOR_DEVICE_ATTR_2(in7_min, S_IRUGO | S_IWUSR, show_in, set_in,
                            7, 1);
static SENSOR_DEVICE_ATTR_2(in7_max, S_IRUGO | S_IWUSR, show_in, set_in,
                            7, 2);

static SENSOR_DEVICE_ATTR_2(in8_input, S_IRUGO, show_in, NULL, 8, 0);
static SENSOR_DEVICE_ATTR_2(in9_input, S_IRUGO, show_in, NULL, 9, 0);
static SENSOR_DEVICE_ATTR_2(in10_input, S_IRUGO, show_in, NULL, 10, 0);
static SENSOR_DEVICE_ATTR_2(in11_input, S_IRUGO, show_in, NULL, 11, 0);
static SENSOR_DEVICE_ATTR_2(in12_input, S_IRUGO, show_in, NULL, 12, 0);

/* Up to 6 temperatures */
static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
                         char *buf)
{
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        int nr = sattr->nr;
        int index = sattr->index;
        struct it87_data *data = it87_update_device(dev);

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

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);
        int nr = sattr->nr;
        int index = sattr->index;
        struct it87_data *data = dev_get_drvdata(dev);
        long val;
        u8 reg, regval;

        if (kstrtol(buf, 10, &val) < 0)
                return -EINVAL;

        mutex_lock(&data->update_lock);

        switch (index) {
        default:
        case 1:
                reg = IT87_REG_TEMP_LOW(nr);
                break;
        case 2:
                reg = IT87_REG_TEMP_HIGH(nr);
                break;
        case 3:
                regval = it87_read_value(data, IT87_REG_BEEP_ENABLE);
                if (!(regval & 0x80)) {
                        regval |= 0x80;
                        it87_write_value(data, IT87_REG_BEEP_ENABLE, regval);
                }
                data->valid = 0;
                reg = IT87_REG_TEMP_OFFSET[nr];
                break;
        }

        data->temp[nr][index] = TEMP_TO_REG(val);
        it87_write_value(data, reg, data->temp[nr][index]);
        mutex_unlock(&data->update_lock);
        return count;

}

static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
static SENSOR_DEVICE_ATTR_2(temp1_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
                            0, 1);
static SENSOR_DEVICE_ATTR_2(temp1_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
                            0, 2);
static SENSOR_DEVICE_ATTR_2(temp1_offset, S_IRUGO | S_IWUSR, show_temp,
                            set_temp, 0, 3);
static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 1, 0);
static SENSOR_DEVICE_ATTR_2(temp2_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
                            1, 1);
static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
                            1, 2);
static SENSOR_DEVICE_ATTR_2(temp2_offset, S_IRUGO | S_IWUSR, show_temp,
                            set_temp, 1, 3);
static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 2, 0);
static SENSOR_DEVICE_ATTR_2(temp3_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
                            2, 1);
static SENSOR_DEVICE_ATTR_2(temp3_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
                            2, 2);
static SENSOR_DEVICE_ATTR_2(temp3_offset, S_IRUGO | S_IWUSR, show_temp,
                            set_temp, 2, 3);
static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 3, 0);
static SENSOR_DEVICE_ATTR_2(temp5_input, S_IRUGO, show_temp, NULL, 4, 0);
static SENSOR_DEVICE_ATTR_2(temp6_input, S_IRUGO, show_temp, NULL, 5, 0);

static ssize_t show_temp_type(struct device *dev, struct device_attribute *attr,
                              char *buf)
{
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        int nr = sensor_attr->index;
        struct it87_data *data = it87_update_device(dev);
        u8 reg = data->sensor;      /* In case value is updated while used */
        u8 extra = data->extra;

        if ((has_temp_peci(data, nr) && (reg >> 6 == nr + 1)) ||
            (has_temp_old_peci(data, nr) && (extra & 0x80)))
                return sprintf(buf, "6\n");  /* Intel PECI */
        if (reg & (1 << nr))
                return sprintf(buf, "3\n");  /* thermal diode */
        if (reg & (8 << nr))
                return sprintf(buf, "4\n");  /* thermistor */
        return sprintf(buf, "0\n");      /* disabled */
}

static ssize_t set_temp_type(struct device *dev, struct device_attribute *attr,
                             const char *buf, size_t count)
{
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        int nr = sensor_attr->index;

        struct it87_data *data = dev_get_drvdata(dev);
        long val;
        u8 reg, extra;

        if (kstrtol(buf, 10, &val) < 0)
                return -EINVAL;

        reg = it87_read_value(data, IT87_REG_TEMP_ENABLE);
        reg &= ~(1 << nr);
        reg &= ~(8 << nr);
        if (has_temp_peci(data, nr) && (reg >> 6 == nr + 1 || val == 6))
                reg &= 0x3f;
        extra = it87_read_value(data, IT87_REG_TEMP_EXTRA);
        if (has_temp_old_peci(data, nr) && ((extra & 0x80) || val == 6))
                extra &= 0x7f;
        if (val == 2) { /* backwards compatibility */
                dev_warn(dev,
                         "Sensor type 2 is deprecated, please use 4 instead\n");
                val = 4;
        }
        /* 3 = thermal diode; 4 = thermistor; 6 = Intel PECI; 0 = disabled */
        if (val == 3)
                reg |= 1 << nr;
        else if (val == 4)
                reg |= 8 << nr;
        else if (has_temp_peci(data, nr) && val == 6)
                reg |= (nr + 1) << 6;
        else if (has_temp_old_peci(data, nr) && val == 6)
                extra |= 0x80;
        else if (val != 0)
                return -EINVAL;

        mutex_lock(&data->update_lock);
        data->sensor = reg;
        data->extra = extra;
        it87_write_value(data, IT87_REG_TEMP_ENABLE, data->sensor);
        if (has_temp_old_peci(data, nr))
                it87_write_value(data, IT87_REG_TEMP_EXTRA, data->extra);
        data->valid = 0;        /* Force cache refresh */
        mutex_unlock(&data->update_lock);
        return count;
}

static SENSOR_DEVICE_ATTR(temp1_type, S_IRUGO | S_IWUSR, show_temp_type,
                          set_temp_type, 0);
static SENSOR_DEVICE_ATTR(temp2_type, S_IRUGO | S_IWUSR, show_temp_type,
                          set_temp_type, 1);
static SENSOR_DEVICE_ATTR(temp3_type, S_IRUGO | S_IWUSR, show_temp_type,
                          set_temp_type, 2);

/* 6 Fans */

static int pwm_mode(const struct it87_data *data, int nr)
{
        if (data->type != it8603 && nr < 3 && !(data->fan_main_ctrl & BIT(nr)))
                return 0;                               /* Full speed */
        if (data->pwm_ctrl[nr] & 0x80)
                return 2;                               /* Automatic mode */
        if ((data->type == it8603 || nr >= 3) &&
            data->pwm_duty[nr] == pwm_to_reg(data, 0xff))
                return 0;                       /* Full speed */

        return 1;                               /* Manual mode */
}

static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
                        char *buf)
{
        struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
        int nr = sattr->nr;
        int index = sattr->index;
        int speed;
        struct it87_data *data = it87_update_device(dev);

        speed = has_16bit_fans(data) ?
                FAN16_FROM_REG(data->fan[nr][index]) :
                FAN_FROM_REG(data->fan[nr][index],
                             DIV_FROM_REG(data->fan_div[nr]));
        return sprintf(buf, "%d\n", speed);
}

static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
                            char *buf)
{
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        struct it87_data *data = it87_update_device(dev);
        int nr = sensor_attr->index;

        return sprintf(buf, "%lu\n", DIV_FROM_REG(data->fan_div[nr]));
}

static ssize_t show_pwm_enable(struct device *dev,
                               struct device_attribute *attr, char *buf)
{
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        struct it87_data *data = it87_update_device(dev);
        int nr = sensor_attr->index;

        return sprintf(buf, "%d\n", pwm_mode(data, nr));
}

static ssize_t show_pwm(struct device *dev, struct device_attribute *attr,
                        char *buf)
{
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        struct it87_data *data = it87_update_device(dev);
        int nr = sensor_attr->index;

        return sprintf(buf, "%d\n",
                       pwm_from_reg(data, data->pwm_duty[nr]));
}

static ssize_t show_pwm_freq(struct device *dev, struct device_attribute *attr,
                             char *buf)
{
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        struct it87_data *data = it87_update_device(dev);
        int nr = sensor_attr->index;
        unsigned int freq;
        int index;

        if (has_pwm_freq2(data) && nr == 1)
                index = (data->extra >> 4) & 0x07;
        else
                index = (data->fan_ctl >> 4) & 0x07;

        freq = pwm_freq[index] / (has_newer_autopwm(data) ? 256 : 128);

        return sprintf(buf, "%u\n", freq);
}

static ssize_t set_fan(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);
        int nr = sattr->nr;
        int index = sattr->index;

        struct it87_data *data = dev_get_drvdata(dev);
        long val;
        u8 reg;

        if (kstrtol(buf, 10, &val) < 0)
                return -EINVAL;

        mutex_lock(&data->update_lock);

        if (has_16bit_fans(data)) {
                data->fan[nr][index] = FAN16_TO_REG(val);
                it87_write_value(data, IT87_REG_FAN_MIN[nr],
                                 data->fan[nr][index] & 0xff);
                it87_write_value(data, IT87_REG_FANX_MIN[nr],
                                 data->fan[nr][index] >> 8);
        } else {
                reg = it87_read_value(data, IT87_REG_FAN_DIV);
                switch (nr) {
                case 0:
                        data->fan_div[nr] = reg & 0x07;
                        break;
                case 1:
                        data->fan_div[nr] = (reg >> 3) & 0x07;
                        break;
                case 2:
                        data->fan_div[nr] = (reg & 0x40) ? 3 : 1;
                        break;
                }
                data->fan[nr][index] =
                  FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
                it87_write_value(data, IT87_REG_FAN_MIN[nr],
                                 data->fan[nr][index]);
        }

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

static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
                           const char *buf, size_t count)
{
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        struct it87_data *data = dev_get_drvdata(dev);
        int nr = sensor_attr->index;
        unsigned long val;
        int min;
        u8 old;

        if (kstrtoul(buf, 10, &val) < 0)
                return -EINVAL;

        mutex_lock(&data->update_lock);
        old = it87_read_value(data, IT87_REG_FAN_DIV);

        /* Save fan min limit */
        min = FAN_FROM_REG(data->fan[nr][1], DIV_FROM_REG(data->fan_div[nr]));

        switch (nr) {
        case 0:
        case 1:
                data->fan_div[nr] = DIV_TO_REG(val);
                break;
        case 2:
                if (val < 8)
                        data->fan_div[nr] = 1;
                else
                        data->fan_div[nr] = 3;
        }
        val = old & 0x80;
        val |= (data->fan_div[0] & 0x07);
        val |= (data->fan_div[1] & 0x07) << 3;
        if (data->fan_div[2] == 3)
                val |= 0x1 << 6;
        it87_write_value(data, IT87_REG_FAN_DIV, val);

        /* Restore fan min limit */
        data->fan[nr][1] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
        it87_write_value(data, IT87_REG_FAN_MIN[nr], data->fan[nr][1]);

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

/* Returns 0 if OK, -EINVAL otherwise */
static int check_trip_points(struct device *dev, int nr)
{
        const struct it87_data *data = dev_get_drvdata(dev);
        int i, err = 0;

        if (has_old_autopwm(data)) {
                for (i = 0; i < 3; i++) {
                        if (data->auto_temp[nr][i] > data->auto_temp[nr][i + 1])
                                err = -EINVAL;
                }
                for (i = 0; i < 2; i++) {
                        if (data->auto_pwm[nr][i] > data->auto_pwm[nr][i + 1])
                                err = -EINVAL;
                }
        } else if (has_newer_autopwm(data)) {
                for (i = 1; i < 3; i++) {
                        if (data->auto_temp[nr][i] > data->auto_temp[nr][i + 1])
                                err = -EINVAL;
                }
        }

        if (err) {
                dev_err(dev,
                        "Inconsistent trip points, not switching to automatic mode\n");
                dev_err(dev, "Adjust the trip points and try again\n");
        }
        return err;
}

static ssize_t set_pwm_enable(struct device *dev, struct device_attribute *attr,
                              const char *buf, size_t count)
{
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        struct it87_data *data = dev_get_drvdata(dev);
        int nr = sensor_attr->index;
        long val;

        if (kstrtol(buf, 10, &val) < 0 || val < 0 || val > 2)
                return -EINVAL;

        /* Check trip points before switching to automatic mode */
        if (val == 2) {
                if (check_trip_points(dev, nr) < 0)
                        return -EINVAL;
        }

        mutex_lock(&data->update_lock);

        if (val == 0) {
                if (nr < 3 && data->type != it8603) {
                        int tmp;
                        /* make sure the fan is on when in on/off mode */
                        tmp = it87_read_value(data, IT87_REG_FAN_CTL);
                        it87_write_value(data, IT87_REG_FAN_CTL, tmp | BIT(nr));
                        /* set on/off mode */
                        data->fan_main_ctrl &= ~BIT(nr);
                        it87_write_value(data, IT87_REG_FAN_MAIN_CTRL,
                                         data->fan_main_ctrl);
                } else {
                        u8 ctrl;

                        /* No on/off mode, set maximum pwm value */
                        data->pwm_duty[nr] = pwm_to_reg(data, 0xff);
                        it87_write_value(data, IT87_REG_PWM_DUTY[nr],
                                         data->pwm_duty[nr]);
                        /* and set manual mode */
                        if (has_newer_autopwm(data)) {
                                ctrl = (data->pwm_ctrl[nr] & 0x7c) |
                                        data->pwm_temp_map[nr];
                        } else {
                                ctrl = data->pwm_duty[nr];
                        }
                        data->pwm_ctrl[nr] = ctrl;
                        it87_write_value(data, IT87_REG_PWM[nr], ctrl);
                }
        } else {
                u8 ctrl;

                if (has_newer_autopwm(data)) {
                        ctrl = (data->pwm_ctrl[nr] & 0x7c) |
                                data->pwm_temp_map[nr];
                        if (val != 1)
                                ctrl |= 0x80;
                } else {
                        ctrl = (val == 1 ? data->pwm_duty[nr] : 0x80);
                }
                data->pwm_ctrl[nr] = ctrl;
                it87_write_value(data, IT87_REG_PWM[nr], ctrl);

                if (data->type != it8603 && nr < 3) {
                        /* set SmartGuardian mode */
                        data->fan_main_ctrl |= BIT(nr);
                        it87_write_value(data, IT87_REG_FAN_MAIN_CTRL,
                                         data->fan_main_ctrl);
                }
        }

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

static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
                       const char *buf, size_t count)
{
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        struct it87_data *data = dev_get_drvdata(dev);
        int nr = sensor_attr->index;
        long val;

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

        mutex_lock(&data->update_lock);
        it87_update_pwm_ctrl(data, nr);
        if (has_newer_autopwm(data)) {
                /*
                 * If we are in automatic mode, the PWM duty cycle register
                 * is read-only so we can't write the value.
                 */
                if (data->pwm_ctrl[nr] & 0x80) {
                        mutex_unlock(&data->update_lock);
                        return -EBUSY;
                }
                data->pwm_duty[nr] = pwm_to_reg(data, val);
                it87_write_value(data, IT87_REG_PWM_DUTY[nr],
                                 data->pwm_duty[nr]);
        } else {
                data->pwm_duty[nr] = pwm_to_reg(data, val);
                /*
                 * If we are in manual mode, write the duty cycle immediately;
                 * otherwise, just store it for later use.
                 */
                if (!(data->pwm_ctrl[nr] & 0x80)) {
                        data->pwm_ctrl[nr] = data->pwm_duty[nr];
                        it87_write_value(data, IT87_REG_PWM[nr],
                                         data->pwm_ctrl[nr]);
                }
        }
        mutex_unlock(&data->update_lock);
        return count;
}

static ssize_t set_pwm_freq(struct device *dev, struct device_attribute *attr,
                            const char *buf, size_t count)
{
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        struct it87_data *data = dev_get_drvdata(dev);
        int nr = sensor_attr->index;
        unsigned long val;
        int i;

        if (kstrtoul(buf, 10, &val) < 0)
                return -EINVAL;

        val = clamp_val(val, 0, 1000000);
        val *= has_newer_autopwm(data) ? 256 : 128;

        /* Search for the nearest available frequency */
        for (i = 0; i < 7; i++) {
                if (val > (pwm_freq[i] + pwm_freq[i + 1]) / 2)
                        break;
        }

        mutex_lock(&data->update_lock);
        if (nr == 0) {
                data->fan_ctl = it87_read_value(data, IT87_REG_FAN_CTL) & 0x8f;
                data->fan_ctl |= i << 4;
                it87_write_value(data, IT87_REG_FAN_CTL, data->fan_ctl);
        } else {
                data->extra = it87_read_value(data, IT87_REG_TEMP_EXTRA) & 0x8f;
                data->extra |= i << 4;
                it87_write_value(data, IT87_REG_TEMP_EXTRA, data->extra);
        }
        mutex_unlock(&data->update_lock);

        return count;
}

static ssize_t show_pwm_temp_map(struct device *dev,
                                 struct device_attribute *attr, char *buf)
{
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        struct it87_data *data = it87_update_device(dev);
        int nr = sensor_attr->index;
        int map;

        map = data->pwm_temp_map[nr];
        if (map >= 3)
                map = 0;        /* Should never happen */
        if (nr >= 3)            /* pwm channels 3..6 map to temp4..6 */
                map += 3;

        return sprintf(buf, "%d\n", (int)BIT(map));
}

static ssize_t set_pwm_temp_map(struct device *dev,
                                struct device_attribute *attr, const char *buf,
                                size_t count)
{
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        struct it87_data *data = dev_get_drvdata(dev);
        int nr = sensor_attr->index;
        long val;
        u8 reg;

        if (kstrtol(buf, 10, &val) < 0)
                return -EINVAL;

        if (nr >= 3)
                val -= 3;

        switch (val) {
        case BIT(0):
                reg = 0x00;
                break;
        case BIT(1):
                reg = 0x01;
                break;
        case BIT(2):
                reg = 0x02;
                break;
        default:
                return -EINVAL;
        }

        mutex_lock(&data->update_lock);
        it87_update_pwm_ctrl(data, nr);
        data->pwm_temp_map[nr] = reg;
        /*
         * If we are in automatic mode, write the temp mapping immediately;
         * otherwise, just store it for later use.
         */
        if (data->pwm_ctrl[nr] & 0x80) {
                data->pwm_ctrl[nr] = (data->pwm_ctrl[nr] & 0xfc) |
                                                data->pwm_temp_map[nr];
                it87_write_value(data, IT87_REG_PWM[nr], data->pwm_ctrl[nr]);
        }
        mutex_unlock(&data->update_lock);
        return count;
}

static ssize_t show_auto_pwm(struct device *dev, struct device_attribute *attr,
                             char *buf)
{
        struct it87_data *data = it87_update_device(dev);
        struct sensor_device_attribute_2 *sensor_attr =
                        to_sensor_dev_attr_2(attr);
        int nr = sensor_attr->nr;
        int point = sensor_attr->index;

        return sprintf(buf, "%d\n",
                       pwm_from_reg(data, data->auto_pwm[nr][point]));
}

static ssize_t set_auto_pwm(struct device *dev, struct device_attribute *attr,
                            const char *buf, size_t count)
{
        struct it87_data *data = dev_get_drvdata(dev);
        struct sensor_device_attribute_2 *sensor_attr =
                        to_sensor_dev_attr_2(attr);
        int nr = sensor_attr->nr;
        int point = sensor_attr->index;
        int regaddr;
        long val;

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

        mutex_lock(&data->update_lock);
        data->auto_pwm[nr][point] = pwm_to_reg(data, val);
        if (has_newer_autopwm(data))
                regaddr = IT87_REG_AUTO_TEMP(nr, 3);
        else
                regaddr = IT87_REG_AUTO_PWM(nr, point);
        it87_write_value(data, regaddr, data->auto_pwm[nr][point]);
        mutex_unlock(&data->update_lock);
        return count;
}

static ssize_t show_auto_pwm_slope(struct device *dev,
                                   struct device_attribute *attr, char *buf)
{
        struct it87_data *data = it87_update_device(dev);
        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
        int nr = sensor_attr->index;

        return sprintf(buf, "%d\n", data->auto_pwm[nr][1] & 0x7f);
}

static ssize_t set_auto_pwm_slope(struct device *dev,
                                  struct device_attribute *attr,
                                  const char *buf, size_t count)
{
        struct it87_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;

        if (kstrtoul(buf, 10, &val) < 0 || val > 127)
                return -EINVAL;

        mutex_lock(&data->update_lock);
        data->auto_pwm[nr][1] = (data->auto_pwm[nr][1] & 0x80) | val;
        it87_write_value(data, IT87_REG_AUTO_TEMP(nr, 4),
                         data->auto_pwm[nr][1]);
        mutex_unlock(&data->update_lock);
        return count;
}

static ssize_t show_auto_temp(struct device *dev, struct device_attribute *attr,
                              char *buf)
{
        struct it87_data *data = it87_update_device(dev);
        struct sensor_device_attribute_2 *sensor_attr =
                        to_sensor_dev_attr_2(attr);
        int nr = sensor_attr->nr;
        int point = sensor_attr->index;
        int reg;

        if (has_old_autopwm(data) || point)
                reg = data->auto_temp[nr][point];
        else
                reg = data->auto_temp[nr][1] - (data->auto_temp[nr][0] & 0x1f);

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

static ssize_t set_auto_temp(struct device *dev, struct device_attribute *attr,
                             const char *buf, size_t count)
{
        struct it87_data *data = dev_get_drvdata(dev);
        struct sensor_device_attribute_2 *sensor_attr =
                        to_sensor_dev_attr_2(attr);
        int nr = sensor_attr->nr;
        int point = sensor_attr->index;
        long val;
        int reg;

        if (kstrtol(buf, 10, &val) < 0 || val < -128000 || val > 127000)
                return -EINVAL;

        mutex_lock(&data->update_lock);
        if (has_newer_autopwm(data) && !point) {
                reg = data->auto_temp[nr][1] - TEMP_TO_REG(val);
                reg = clamp_val(reg, 0, 0x1f) | (data->auto_temp[nr][0] & 0xe0);
                data->auto_temp[nr][0] = reg;
                it87_write_value(data, IT87_REG_AUTO_TEMP(nr, 5), reg);
        } else {
                reg = TEMP_TO_REG(val);
                data->auto_temp[nr][point] = reg;
                if (has_newer_autopwm(data))
                        point--;
                it87_write_value(data, IT87_REG_AUTO_TEMP(nr, point), reg);
        }
        mutex_unlock(&data->update_lock);
        return count;
}

static SENSOR_DEVICE_ATTR_2(fan1_input, S_IRUGO, show_fan, NULL, 0, 0);
static SENSOR_DEVICE_ATTR_2(fan1_min, S_IRUGO | S_IWUSR, show_fan, set_fan,
                            0, 1);
static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR, show_fan_div,
                          set_fan_div, 0);

static SENSOR_DEVICE_ATTR_2(fan2_input, S_IRUGO, show_fan, NULL, 1, 0);
static SENSOR_DEVICE_ATTR_2(fan2_min, S_IRUGO | S_IWUSR, show_fan, set_fan,
                            1, 1);
static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR, show_fan_div,
                          set_fan_div, 1);

static SENSOR_DEVICE_ATTR_2(fan3_input, S_IRUGO, show_fan, NULL, 2, 0);
static SENSOR_DEVICE_ATTR_2(fan3_min, S_IRUGO | S_IWUSR, show_fan, set_fan,
                            2, 1);
static SENSOR_DEVICE_ATTR(fan3_div, S_IRUGO | S_IWUSR, show_fan_div,
                          set_fan_div, 2);

static SENSOR_DEVICE_ATTR_2(fan4_input, S_IRUGO, show_fan, NULL, 3, 0);
static SENSOR_DEVICE_ATTR_2(fan4_min, S_IRUGO | S_IWUSR, show_fan, set_fan,
                            3, 1);

static SENSOR_DEVICE_ATTR_2(fan5_input, S_IRUGO, show_fan, NULL, 4, 0);
static SENSOR_DEVICE_ATTR_2(fan5_min, S_IRUGO | S_IWUSR, show_fan, set_fan,
                            4, 1);

static SENSOR_DEVICE_ATTR_2(fan6_input, S_IRUGO, show_fan, NULL, 5, 0);
static SENSOR_DEVICE_ATTR_2(fan6_min, S_IRUGO | S_IWUSR, show_fan, set_fan,
                            5, 1);

static SENSOR_DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR,
                          show_pwm_enable, set_pwm_enable, 0);
static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm, set_pwm, 0);
static SENSOR_DEVICE_ATTR(pwm1_freq, S_IRUGO | S_IWUSR, show_pwm_freq,
                          set_pwm_freq, 0);
static SENSOR_DEVICE_ATTR(pwm1_auto_channels_temp, S_IRUGO,
                          show_pwm_temp_map, set_pwm_temp_map, 0);
static SENSOR_DEVICE_ATTR_2(pwm1_auto_point1_pwm, S_IRUGO | S_IWUSR,
                            show_auto_pwm, set_auto_pwm, 0, 0);
static SENSOR_DEVICE_ATTR_2(pwm1_auto_point2_pwm, S_IRUGO | S_IWUSR,
                            show_auto_pwm, set_auto_pwm, 0, 1);
static SENSOR_DEVICE_ATTR_2(pwm1_auto_point3_pwm, S_IRUGO | S_IWUSR,
                            show_auto_pwm, set_auto_pwm, 0, 2);
static SENSOR_DEVICE_ATTR_2(pwm1_auto_point4_pwm, S_IRUGO,
                            show_auto_pwm, NULL, 0, 3);
static SENSOR_DEVICE_ATTR_2(pwm1_auto_point1_temp, S_IRUGO | S_IWUSR,
                            show_auto_temp, set_auto_temp, 0, 1);
static SENSOR_DEVICE_ATTR_2(pwm1_auto_point1_temp_hyst, S_IRUGO | S_IWUSR,
                            show_auto_temp, set_auto_temp, 0, 0);
static SENSOR_DEVICE_ATTR_2(pwm1_auto_point2_temp, S_IRUGO | S_IWUSR,
                            show_auto_temp, set_auto_temp, 0, 2);
static SENSOR_DEVICE_ATTR_2(pwm1_auto_point3_temp, S_IRUGO | S_IWUSR,
                            show_auto_temp, set_auto_temp, 0, 3);
static SENSOR_DEVICE_ATTR_2(pwm1_auto_point4_temp, S_IRUGO | S_IWUSR,
                            show_auto_temp, set_auto_temp, 0, 4);
static SENSOR_DEVICE_ATTR_2(pwm1_auto_start, S_IRUGO | S_IWUSR,
                            show_auto_pwm, set_auto_pwm, 0, 0);
static SENSOR_DEVICE_ATTR(pwm1_auto_slope, S_IRUGO | S_IWUSR,
                          show_auto_pwm_slope, set_auto_pwm_slope, 0);

static SENSOR_DEVICE_ATTR(pwm2_enable, S_IRUGO | S_IWUSR,
                          show_pwm_enable, set_pwm_enable, 1);
static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, show_pwm, set_pwm, 1);
static SENSOR_DEVICE_ATTR(pwm2_freq, S_IRUGO, show_pwm_freq, set_pwm_freq, 1);
static SENSOR_DEVICE_ATTR(pwm2_auto_channels_temp, S_IRUGO,
                          show_pwm_temp_map, set_pwm_temp_map, 1);
static SENSOR_DEVICE_ATTR_2(pwm2_auto_point1_pwm, S_IRUGO | S_IWUSR,
                            show_auto_pwm, set_auto_pwm, 1, 0);
static SENSOR_DEVICE_ATTR_2(pwm2_auto_point2_pwm, S_IRUGO | S_IWUSR,
                            show_auto_pwm, set_auto_pwm, 1, 1);
static SENSOR_DEVICE_ATTR_2(pwm2_auto_point3_pwm, S_IRUGO | S_IWUSR,
                            show_auto_pwm, set_auto_pwm, 1, 2);
static SENSOR_DEVICE_ATTR_2(pwm2_auto_point4_pwm, S_IRUGO,
                            show_auto_pwm, NULL, 1, 3);
static SENSOR_DEVICE_ATTR_2(pwm2_auto_point1_temp, S_IRUGO | S_IWUSR,
                            show_auto_temp, set_auto_temp, 1, 1);
static SENSOR_DEVICE_ATTR_2(pwm2_auto_point1_temp_hyst, S_IRUGO | S_IWUSR,
                            show_auto_temp, set_auto_temp, 1, 0);
static SENSOR_DEVICE_ATTR_2(pwm2_auto_point2_temp, S_IRUGO | S_IWUSR,
                            show_auto_temp, set_auto_temp, 1, 2);
static SENSOR_DEVICE_ATTR_2(pwm2_auto_point3_temp, S_IRUGO | S_IWUSR,
                            show_auto_temp, set_auto_temp, 1, 3);
static SENSOR_DEVICE_ATTR_2(pwm2_auto_point4_temp, S_IRUGO | S_IWUSR,
                            show_auto_temp, set_auto_temp, 1, 4);
static SENSOR_DEVICE_ATTR_2(pwm2_auto_start, S_IRUGO | S_IWUSR,
                            show_auto_pwm, set_auto_pwm, 1, 0);
static SENSOR_DEVICE_ATTR(pwm2_auto_slope, S_IRUGO | S_IWUSR,
                          show_auto_pwm_slope, set_auto_pwm_slope, 1);

static SENSOR_DEVICE_ATTR(pwm3_enable, S_IRUGO | S_IWUSR,
                          show_pwm_enable, set_pwm_enable, 2);
static SENSOR_DEVICE_ATTR(pwm3, S_IRUGO | S_IWUSR, show_pwm, set_pwm, 2);
static SENSOR_DEVICE_ATTR(pwm3_freq, S_IRUGO, show_pwm_freq, NULL, 2);
static SENSOR_DEVICE_ATTR(pwm3_auto_channels_temp, S_IRUGO,
                          show_pwm_temp_map, set_pwm_temp_map, 2);
static SENSOR_DEVICE_ATTR_2(pwm3_auto_point1_pwm, S_IRUGO | S_IWUSR,
                            show_auto_pwm, set_auto_pwm, 2, 0);
static SENSOR_DEVICE_ATTR_2(pwm3_auto_point2_pwm, S_IRUGO | S_IWUSR,
                            show_auto_pwm, set_auto_pwm, 2, 1);
static SENSOR_DEVICE_ATTR_2(pwm3_auto_point3_pwm, S_IRUGO | S_IWUSR,
                            show_auto_pwm, set_auto_pwm, 2, 2);
static SENSOR_DEVICE_ATTR_2(pwm3_auto_point4_pwm, S_IRUGO,
                            show_auto_pwm, NULL, 2, 3);
static SENSOR_DEVICE_ATTR_2(pwm3_auto_point1_temp, S_IRUGO | S_IWUSR,
                            show_auto_temp, set_auto_temp, 2, 1);
static SENSOR_DEVICE_ATTR_2(pwm3_auto_point1_temp_hyst, S_IRUGO | S_IWUSR,
                            show_auto_temp, set_auto_temp, 2, 0);
static SENSOR_DEVICE_ATTR_2(pwm3_auto_point2_temp, S_IRUGO | S_IWUSR,
                            show_auto_temp, set_auto_temp, 2, 2);
static SENSOR_DEVICE_ATTR_2(pwm3_auto_point3_temp, S_IRUGO | S_IWUSR,
                            show_auto_temp, set_auto_temp, 2, 3);
static SENSOR_DEVICE_ATTR_2(pwm3_auto_point4_temp, S_IRUGO | S_IWUSR,
                            show_auto_temp, set_auto_temp, 2, 4);
static SENSOR_DEVICE_ATTR_2(pwm3_auto_start, S_IRUGO | S_IWUSR,
                            show_auto_pwm, set_auto_pwm, 2, 0);
static SENSOR_DEVICE_ATTR(pwm3_auto_slope, S_IRUGO | S_IWUSR,
                          show_auto_pwm_slope, set_auto_pwm_slope, 2);

static SENSOR_DEVICE_ATTR(pwm4_enable, S_IRUGO | S_IWUSR,
                          show_pwm_enable, set_pwm_enable, 3);
static SENSOR_DEVICE_ATTR(pwm4, S_IRUGO | S_IWUSR, show_pwm, set_pwm, 3);
static SENSOR_DEVICE_ATTR(pwm4_freq, S_IRUGO, show_pwm_freq, NULL, 3);
static SENSOR_DEVICE_ATTR(pwm4_auto_channels_temp, S_IRUGO,
                          show_pwm_temp_map, set_pwm_temp_map, 3);
static SENSOR_DEVICE_ATTR_2(pwm4_auto_point1_temp, S_IRUGO | S_IWUSR,
                            show_auto_temp, set_auto_temp, 2, 1);
static SENSOR_DEVICE_ATTR_2(pwm4_auto_point1_temp_hyst, S_IRUGO | S_IWUSR,
                            show_auto_temp, set_auto_temp, 2, 0);
static SENSOR_DEVICE_ATTR_2(pwm4_auto_point2_temp, S_IRUGO | S_IWUSR,
                            show_auto_temp, set_auto_temp, 2, 2);
static SENSOR_DEVICE_ATTR_2(pwm4_auto_point3_temp, S_IRUGO | S_IWUSR,
                            show_auto_temp, set_auto_temp, 2, 3);
static SENSOR_DEVICE_ATTR_2(pwm4_auto_start, S_IRUGO | S_IWUSR,
                            show_auto_pwm, set_auto_pwm, 3, 0);
static SENSOR_DEVICE_ATTR(pwm4_auto_slope, S_IRUGO | S_IWUSR,
                          show_auto_pwm_slope, set_auto_pwm_slope, 3);

static SENSOR_DEVICE_ATTR(pwm5_enable, S_IRUGO | S_IWUSR,
                          show_pwm_enable, set_pwm_enable, 4);
static SENSOR_DEVICE_ATTR(pwm5, S_IRUGO | S_IWUSR, show_pwm, set_pwm, 4);
static SENSOR_DEVICE_ATTR(pwm5_freq, S_IRUGO, show_pwm_freq, NULL, 4);
static SENSOR_DEVICE_ATTR(pwm5_auto_channels_temp, S_IRUGO,
                          show_pwm_temp_map, set_pwm_temp_map, 4);
static SENSOR_DEVICE_ATTR_2(pwm5_auto_point1_temp, S_IRUGO | S_IWUSR,
                            show_auto_temp, set_auto_temp, 2, 1);
static SENSOR_DEVICE_ATTR_2(pwm5_auto_point1_temp_hyst, S_IRUGO | S_IWUSR,
                            show_auto_temp, set_auto_temp, 2, 0);
static SENSOR_DEVICE_ATTR_2(pwm5_auto_point2_temp, S_IRUGO | S_IWUSR,
                            show_auto_temp, set_auto_temp, 2, 2);
static SENSOR_DEVICE_ATTR_2(pwm5_auto_point3_temp, S_IRUGO | S_IWUSR,
                            show_auto_temp, set_auto_temp, 2, 3);
static SENSOR_DEVICE_ATTR_2(pwm5_auto_start, S_IRUGO | S_IWUSR,
                            show_auto_pwm, set_auto_pwm, 4, 0);
static SENSOR_DEVICE_ATTR(pwm5_auto_slope, S_IRUGO | S_IWUSR,
                          show_auto_pwm_slope, set_auto_pwm_slope, 4);

static SENSOR_DEVICE_ATTR(pwm6_enable, S_IRUGO | S_IWUSR,
                          show_pwm_enable, set_pwm_enable, 5);
static SENSOR_DEVICE_ATTR(pwm6, S_IRUGO | S_IWUSR, show_pwm, set_pwm, 5);
static SENSOR_DEVICE_ATTR(pwm6_freq, S_IRUGO, show_pwm_freq, NULL, 5);
static SENSOR_DEVICE_ATTR(pwm6_auto_channels_temp, S_IRUGO,
                          show_pwm_temp_map, set_pwm_temp_map, 5);
static SENSOR_DEVICE_ATTR_2(pwm6_auto_point1_temp, S_IRUGO | S_IWUSR,
                            show_auto_temp, set_auto_temp, 2, 1);
static SENSOR_DEVICE_ATTR_2(pwm6_auto_point1_temp_hyst, S_IRUGO | S_IWUSR,
                            show_auto_temp, set_auto_temp, 2, 0);
static SENSOR_DEVICE_ATTR_2(pwm6_auto_point2_temp, S_IRUGO | S_IWUSR,
                            show_auto_temp, set_auto_temp, 2, 2);
static SENSOR_DEVICE_ATTR_2(pwm6_auto_point3_temp, S_IRUGO | S_IWUSR,
                            show_auto_temp, set_auto_temp, 2, 3);
static SENSOR_DEVICE_ATTR_2(pwm6_auto_start, S_IRUGO | S_IWUSR,
                            show_auto_pwm, set_auto_pwm, 5, 0);
static SENSOR_DEVICE_ATTR(pwm6_auto_slope, S_IRUGO | S_IWUSR,
                          show_auto_pwm_slope, set_auto_pwm_slope, 5);

/* Alarms */
static ssize_t alarms_show(struct device *dev, struct device_attribute *attr,
                           char *buf)
{
        struct it87_data *data = it87_update_device(dev);

        return sprintf(buf, "%u\n", data->alarms);
}
static DEVICE_ATTR_RO(alarms);

static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
                          char *buf)
{
        struct it87_data *data = it87_update_device(dev);
        int bitnr = to_sensor_dev_attr(attr)->index;

        return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
}

static ssize_t clear_intrusion(struct device *dev,
                               struct device_attribute *attr, const char *buf,
                               size_t count)
{
        struct it87_data *data = dev_get_drvdata(dev);
        int config;
        long val;

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

        mutex_lock(&data->update_lock);
        config = it87_read_value(data, IT87_REG_CONFIG);
        if (config < 0) {
                count = config;
        } else {
                config |= BIT(5);
                it87_write_value(data, IT87_REG_CONFIG, config);
                /* Invalidate cache to force re-read */
                data->valid = 0;
        }
        mutex_unlock(&data->update_lock);

        return count;
}

static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 8);
static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 9);
static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 10);
static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 11);
static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 12);
static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 13);
static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 14);
static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 15);
static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 0);
static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 1);
static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 2);
static SENSOR_DEVICE_ATTR(fan4_alarm, S_IRUGO, show_alarm, NULL, 3);
static SENSOR_DEVICE_ATTR(fan5_alarm, S_IRUGO, show_alarm, NULL, 6);
static SENSOR_DEVICE_ATTR(fan6_alarm, S_IRUGO, show_alarm, NULL, 7);
static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 16);
static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 17);
static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 18);
static SENSOR_DEVICE_ATTR(intrusion0_alarm, S_IRUGO | S_IWUSR,
                          show_alarm, clear_intrusion, 4);

static ssize_t show_beep(struct device *dev, struct device_attribute *attr,
                         char *buf)
{
        struct it87_data *data = it87_update_device(dev);
        int bitnr = to_sensor_dev_attr(attr)->index;

        return sprintf(buf, "%u\n", (data->beeps >> bitnr) & 1);
}

static ssize_t set_beep(struct device *dev, struct device_attribute *attr,
                        const char *buf, size_t count)
{
        int bitnr = to_sensor_dev_attr(attr)->index;
        struct it87_data *data = dev_get_drvdata(dev);
        long val;

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

        mutex_lock(&data->update_lock);
        data->beeps = it87_read_value(data, IT87_REG_BEEP_ENABLE);
        if (val)
                data->beeps |= BIT(bitnr);
        else
                data->beeps &= ~BIT(bitnr);
        it87_write_value(data, IT87_REG_BEEP_ENABLE, data->beeps);
        mutex_unlock(&data->update_lock);
        return count;
}

static SENSOR_DEVICE_ATTR(in0_beep, S_IRUGO | S_IWUSR,
                          show_beep, set_beep, 1);
static SENSOR_DEVICE_ATTR(in1_beep, S_IRUGO, show_beep, NULL, 1);
static SENSOR_DEVICE_ATTR(in2_beep, S_IRUGO, show_beep, NULL, 1);
static SENSOR_DEVICE_ATTR(in3_beep, S_IRUGO, show_beep, NULL, 1);
static SENSOR_DEVICE_ATTR(in4_beep, S_IRUGO, show_beep, NULL, 1);
static SENSOR_DEVICE_ATTR(in5_beep, S_IRUGO, show_beep, NULL, 1);
static SENSOR_DEVICE_ATTR(in6_beep, S_IRUGO, show_beep, NULL, 1);
static SENSOR_DEVICE_ATTR(in7_beep, S_IRUGO, show_beep, NULL, 1);
/* fanX_beep writability is set later */
static SENSOR_DEVICE_ATTR(fan1_beep, S_IRUGO, show_beep, set_beep, 0);
static SENSOR_DEVICE_ATTR(fan2_beep, S_IRUGO, show_beep, set_beep, 0);
static SENSOR_DEVICE_ATTR(fan3_beep, S_IRUGO, show_beep, set_beep, 0);
static SENSOR_DEVICE_ATTR(fan4_beep, S_IRUGO, show_beep, set_beep, 0);
static SENSOR_DEVICE_ATTR(fan5_beep, S_IRUGO, show_beep, set_beep, 0);
static SENSOR_DEVICE_ATTR(fan6_beep, S_IRUGO, show_beep, set_beep, 0);
static SENSOR_DEVICE_ATTR(temp1_beep, S_IRUGO | S_IWUSR,
                          show_beep, set_beep, 2);
static SENSOR_DEVICE_ATTR(temp2_beep, S_IRUGO, show_beep, NULL, 2);
static SENSOR_DEVICE_ATTR(temp3_beep, S_IRUGO, show_beep, NULL, 2);

static ssize_t vrm_show(struct device *dev, struct device_attribute *attr,
                        char *buf)
{
        struct it87_data *data = dev_get_drvdata(dev);

        return sprintf(buf, "%u\n", data->vrm);
}

static ssize_t vrm_store(struct device *dev, struct device_attribute *attr,
                         const char *buf, size_t count)
{
        struct it87_data *data = dev_get_drvdata(dev);
        unsigned long val;

        if (kstrtoul(buf, 10, &val) < 0)
                return -EINVAL;

        data->vrm = val;

        return count;
}
static DEVICE_ATTR_RW(vrm);

static ssize_t cpu0_vid_show(struct device *dev,
                             struct device_attribute *attr, char *buf)
{
        struct it87_data *data = it87_update_device(dev);

        return sprintf(buf, "%ld\n", (long)vid_from_reg(data->vid, data->vrm));
}
static DEVICE_ATTR_RO(cpu0_vid);

static ssize_t show_label(struct device *dev, struct device_attribute *attr,
                          char *buf)
{
        static const char * const labels[] = {
                "+5V",
                "5VSB",
                "Vbat",
                "AVCC",
        };
        static const char * const labels_it8721[] = {
                "+3.3V",
                "3VSB",
                "Vbat",
                "+3.3V",
        };
        struct it87_data *data = dev_get_drvdata(dev);
        int nr = to_sensor_dev_attr(attr)->index;
        const char *label;

        if (has_vin3_5v(data) && nr == 0)
                label = labels[0];
        else if (has_12mv_adc(data) || has_10_9mv_adc(data))
                label = labels_it8721[nr];
        else
                label = labels[nr];

        return sprintf(buf, "%s\n", label);
}
static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL, 0);
static SENSOR_DEVICE_ATTR(in7_label, S_IRUGO, show_label, NULL, 1);
static SENSOR_DEVICE_ATTR(in8_label, S_IRUGO, show_label, NULL, 2);
/* AVCC3 */
static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, show_label, NULL, 3);

static umode_t it87_in_is_visible(struct kobject *kobj,
                                  struct attribute *attr, int index)
{
        struct device *dev = container_of(kobj, struct device, kobj);
        struct it87_data *data = dev_get_drvdata(dev);
        int i = index / 5;      /* voltage index */
        int a = index % 5;      /* attribute index */

        if (index >= 40) {      /* in8 and higher only have input attributes */
                i = index - 40 + 8;
                a = 0;

        }

        if (!(data->has_in & BIT(i)))
                return 0;

        if (a == 4 && !data->has_beep)
                return 0;

        return attr->mode;
}

static struct attribute *it87_attributes_in[] = {
        &sensor_dev_attr_in0_input.dev_attr.attr,
        &sensor_dev_attr_in0_min.dev_attr.attr,
        &sensor_dev_attr_in0_max.dev_attr.attr,
        &sensor_dev_attr_in0_alarm.dev_attr.attr,
        &sensor_dev_attr_in0_beep.dev_attr.attr,        /* 4 */

        &sensor_dev_attr_in1_input.dev_attr.attr,
        &sensor_dev_attr_in1_min.dev_attr.attr,
        &sensor_dev_attr_in1_max.dev_attr.attr,
        &sensor_dev_attr_in1_alarm.dev_attr.attr,
        &sensor_dev_attr_in1_beep.dev_attr.attr,        /* 9 */

        &sensor_dev_attr_in2_input.dev_attr.attr,
        &sensor_dev_attr_in2_min.dev_attr.attr,
        &sensor_dev_attr_in2_max.dev_attr.attr,
        &sensor_dev_attr_in2_alarm.dev_attr.attr,
        &sensor_dev_attr_in2_beep.dev_attr.attr,        /* 14 */

        &sensor_dev_attr_in3_input.dev_attr.attr,
        &sensor_dev_attr_in3_min.dev_attr.attr,
        &sensor_dev_attr_in3_max.dev_attr.attr,
        &sensor_dev_attr_in3_alarm.dev_attr.attr,
        &sensor_dev_attr_in3_beep.dev_attr.attr,        /* 19 */

        &sensor_dev_attr_in4_input.dev_attr.attr,
        &sensor_dev_attr_in4_min.dev_attr.attr,
        &sensor_dev_attr_in4_max.dev_attr.attr,
        &sensor_dev_attr_in4_alarm.dev_attr.attr,
        &sensor_dev_attr_in4_beep.dev_attr.attr,        /* 24 */

        &sensor_dev_attr_in5_input.dev_attr.attr,
        &sensor_dev_attr_in5_min.dev_attr.attr,
        &sensor_dev_attr_in5_max.dev_attr.attr,
        &sensor_dev_attr_in5_alarm.dev_attr.attr,
        &sensor_dev_attr_in5_beep.dev_attr.attr,        /* 29 */

        &sensor_dev_attr_in6_input.dev_attr.attr,
        &sensor_dev_attr_in6_min.dev_attr.attr,
        &sensor_dev_attr_in6_max.dev_attr.attr,
        &sensor_dev_attr_in6_alarm.dev_attr.attr,
        &sensor_dev_attr_in6_beep.dev_attr.attr,        /* 34 */

        &sensor_dev_attr_in7_input.dev_attr.attr,
        &sensor_dev_attr_in7_min.dev_attr.attr,
        &sensor_dev_attr_in7_max.dev_attr.attr,
        &sensor_dev_attr_in7_alarm.dev_attr.attr,
        &sensor_dev_attr_in7_beep.dev_attr.attr,        /* 39 */

        &sensor_dev_attr_in8_input.dev_attr.attr,       /* 40 */
        &sensor_dev_attr_in9_input.dev_attr.attr,
        &sensor_dev_attr_in10_input.dev_attr.attr,
        &sensor_dev_attr_in11_input.dev_attr.attr,
        &sensor_dev_attr_in12_input.dev_attr.attr,
        NULL
};

static const struct attribute_group it87_group_in = {
        .attrs = it87_attributes_in,
        .is_visible = it87_in_is_visible,
};

static umode_t it87_temp_is_visible(struct kobject *kobj,
                                    struct attribute *attr, int index)
{
        struct device *dev = container_of(kobj, struct device, kobj);
        struct it87_data *data = dev_get_drvdata(dev);
        int i = index / 7;      /* temperature index */
        int a = index % 7;      /* attribute index */

        if (index >= 21) {
                i = index - 21 + 3;
                a = 0;
        }

        if (!(data->has_temp & BIT(i)))
                return 0;

        if (a == 5 && !has_temp_offset(data))
                return 0;

        if (a == 6 && !data->has_beep)
                return 0;

        return attr->mode;
}

static struct attribute *it87_attributes_temp[] = {
        &sensor_dev_attr_temp1_input.dev_attr.attr,
        &sensor_dev_attr_temp1_max.dev_attr.attr,
        &sensor_dev_attr_temp1_min.dev_attr.attr,
        &sensor_dev_attr_temp1_type.dev_attr.attr,
        &sensor_dev_attr_temp1_alarm.dev_attr.attr,
        &sensor_dev_attr_temp1_offset.dev_attr.attr,    /* 5 */
        &sensor_dev_attr_temp1_beep.dev_attr.attr,      /* 6 */

        &sensor_dev_attr_temp2_input.dev_attr.attr,     /* 7 */
        &sensor_dev_attr_temp2_max.dev_attr.attr,
        &sensor_dev_attr_temp2_min.dev_attr.attr,
        &sensor_dev_attr_temp2_type.dev_attr.attr,
        &sensor_dev_attr_temp2_alarm.dev_attr.attr,
        &sensor_dev_attr_temp2_offset.dev_attr.attr,
        &sensor_dev_attr_temp2_beep.dev_attr.attr,

        &sensor_dev_attr_temp3_input.dev_attr.attr,     /* 14 */
        &sensor_dev_attr_temp3_max.dev_attr.attr,
        &sensor_dev_attr_temp3_min.dev_attr.attr,
        &sensor_dev_attr_temp3_type.dev_attr.attr,
        &sensor_dev_attr_temp3_alarm.dev_attr.attr,
        &sensor_dev_attr_temp3_offset.dev_attr.attr,
        &sensor_dev_attr_temp3_beep.dev_attr.attr,

        &sensor_dev_attr_temp4_input.dev_attr.attr,     /* 21 */
        &sensor_dev_attr_temp5_input.dev_attr.attr,
        &sensor_dev_attr_temp6_input.dev_attr.attr,
        NULL
};

static const struct attribute_group it87_group_temp = {
        .attrs = it87_attributes_temp,
        .is_visible = it87_temp_is_visible,
};

static umode_t it87_is_visible(struct kobject *kobj,
                               struct attribute *attr, int index)
{
        struct device *dev = container_of(kobj, struct device, kobj);
        struct it87_data *data = dev_get_drvdata(dev);

        if ((index == 2 || index == 3) && !data->has_vid)
                return 0;

        if (index > 3 && !(data->in_internal & BIT(index - 4)))
                return 0;

        return attr->mode;
}

static struct attribute *it87_attributes[] = {
        &dev_attr_alarms.attr,
        &sensor_dev_attr_intrusion0_alarm.dev_attr.attr,
        &dev_attr_vrm.attr,                             /* 2 */
        &dev_attr_cpu0_vid.attr,                        /* 3 */
        &sensor_dev_attr_in3_label.dev_attr.attr,       /* 4 .. 7 */
        &sensor_dev_attr_in7_label.dev_attr.attr,
        &sensor_dev_attr_in8_label.dev_attr.attr,
        &sensor_dev_attr_in9_label.dev_attr.attr,
        NULL
};

static const struct attribute_group it87_group = {
        .attrs = it87_attributes,
        .is_visible = it87_is_visible,
};

static umode_t it87_fan_is_visible(struct kobject *kobj,
                                   struct attribute *attr, int index)
{
        struct device *dev = container_of(kobj, struct device, kobj);
        struct it87_data *data = dev_get_drvdata(dev);
        int i = index / 5;      /* fan index */
        int a = index % 5;      /* attribute index */

        if (index >= 15) {      /* fan 4..6 don't have divisor attributes */
                i = (index - 15) / 4 + 3;
                a = (index - 15) % 4;
        }

        if (!(data->has_fan & BIT(i)))
                return 0;

        if (a == 3) {                           /* beep */
                if (!data->has_beep)
                        return 0;
                /* first fan beep attribute is writable */
                if (i == __ffs(data->has_fan))
                        return attr->mode | S_IWUSR;
        }

        if (a == 4 && has_16bit_fans(data))     /* divisor */
                return 0;

        return attr->mode;
}

static struct attribute *it87_attributes_fan[] = {
        &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_fan1_beep.dev_attr.attr,       /* 3 */
        &sensor_dev_attr_fan1_div.dev_attr.attr,        /* 4 */

        &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_fan2_beep.dev_attr.attr,
        &sensor_dev_attr_fan2_div.dev_attr.attr,        /* 9 */

        &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_fan3_beep.dev_attr.attr,
        &sensor_dev_attr_fan3_div.dev_attr.attr,        /* 14 */

        &sensor_dev_attr_fan4_input.dev_attr.attr,      /* 15 */
        &sensor_dev_attr_fan4_min.dev_attr.attr,
        &sensor_dev_attr_fan4_alarm.dev_attr.attr,
        &sensor_dev_attr_fan4_beep.dev_attr.attr,

        &sensor_dev_attr_fan5_input.dev_attr.attr,      /* 19 */
        &sensor_dev_attr_fan5_min.dev_attr.attr,
        &sensor_dev_attr_fan5_alarm.dev_attr.attr,
        &sensor_dev_attr_fan5_beep.dev_attr.attr,

        &sensor_dev_attr_fan6_input.dev_attr.attr,      /* 23 */
        &sensor_dev_attr_fan6_min.dev_attr.attr,
        &sensor_dev_attr_fan6_alarm.dev_attr.attr,
        &sensor_dev_attr_fan6_beep.dev_attr.attr,
        NULL
};

static const struct attribute_group it87_group_fan = {
        .attrs = it87_attributes_fan,
        .is_visible = it87_fan_is_visible,
};

static umode_t it87_pwm_is_visible(struct kobject *kobj,
                                   struct attribute *attr, int index)
{
        struct device *dev = container_of(kobj, struct device, kobj);
        struct it87_data *data = dev_get_drvdata(dev);
        int i = index / 4;      /* pwm index */
        int a = index % 4;      /* attribute index */

        if (!(data->has_pwm & BIT(i)))
                return 0;

        /* pwmX_auto_channels_temp is only writable if auto pwm is supported */
        if (a == 3 && (has_old_autopwm(data) || has_newer_autopwm(data)))
                return attr->mode | S_IWUSR;

        /* pwm2_freq is writable if there are two pwm frequency selects */
        if (has_pwm_freq2(data) && i == 1 && a == 2)
                return attr->mode | S_IWUSR;

        return attr->mode;
}

static struct attribute *it87_attributes_pwm[] = {
        &sensor_dev_attr_pwm1_enable.dev_attr.attr,
        &sensor_dev_attr_pwm1.dev_attr.attr,
        &sensor_dev_attr_pwm1_freq.dev_attr.attr,
        &sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr,

        &sensor_dev_attr_pwm2_enable.dev_attr.attr,
        &sensor_dev_attr_pwm2.dev_attr.attr,
        &sensor_dev_attr_pwm2_freq.dev_attr.attr,
        &sensor_dev_attr_pwm2_auto_channels_temp.dev_attr.attr,

        &sensor_dev_attr_pwm3_enable.dev_attr.attr,
        &sensor_dev_attr_pwm3.dev_attr.attr,
        &sensor_dev_attr_pwm3_freq.dev_attr.attr,
        &sensor_dev_attr_pwm3_auto_channels_temp.dev_attr.attr,

        &sensor_dev_attr_pwm4_enable.dev_attr.attr,
        &sensor_dev_attr_pwm4.dev_attr.attr,
        &sensor_dev_attr_pwm4_freq.dev_attr.attr,
        &sensor_dev_attr_pwm4_auto_channels_temp.dev_attr.attr,

        &sensor_dev_attr_pwm5_enable.dev_attr.attr,
        &sensor_dev_attr_pwm5.dev_attr.attr,
        &sensor_dev_attr_pwm5_freq.dev_attr.attr,
        &sensor_dev_attr_pwm5_auto_channels_temp.dev_attr.attr,

        &sensor_dev_attr_pwm6_enable.dev_attr.attr,
        &sensor_dev_attr_pwm6.dev_attr.attr,
        &sensor_dev_attr_pwm6_freq.dev_attr.attr,
        &sensor_dev_attr_pwm6_auto_channels_temp.dev_attr.attr,

        NULL
};

static const struct attribute_group it87_group_pwm = {
        .attrs = it87_attributes_pwm,
        .is_visible = it87_pwm_is_visible,
};

static umode_t it87_auto_pwm_is_visible(struct kobject *kobj,
                                        struct attribute *attr, int index)
{
        struct device *dev = container_of(kobj, struct device, kobj);
        struct it87_data *data = dev_get_drvdata(dev);
        int i = index / 11;     /* pwm index */
        int a = index % 11;     /* attribute index */

        if (index >= 33) {      /* pwm 4..6 */
                i = (index - 33) / 6 + 3;
                a = (index - 33) % 6 + 4;
        }

        if (!(data->has_pwm & BIT(i)))
                return 0;

        if (has_newer_autopwm(data)) {
                if (a < 4)      /* no auto point pwm */
                        return 0;
                if (a == 8)     /* no auto_point4 */
                        return 0;
        }
        if (has_old_autopwm(data)) {
                if (a >= 9)     /* no pwm_auto_start, pwm_auto_slope */
                        return 0;
        }

        return attr->mode;
}

static struct attribute *it87_attributes_auto_pwm[] = {
        &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
        &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
        &sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
        &sensor_dev_attr_pwm1_auto_point4_pwm.dev_attr.attr,
        &sensor_dev_attr_pwm1_auto_point1_temp.dev_attr.attr,
        &sensor_dev_attr_pwm1_auto_point1_temp_hyst.dev_attr.attr,
        &sensor_dev_attr_pwm1_auto_point2_temp.dev_attr.attr,
        &sensor_dev_attr_pwm1_auto_point3_temp.dev_attr.attr,
        &sensor_dev_attr_pwm1_auto_point4_temp.dev_attr.attr,
        &sensor_dev_attr_pwm1_auto_start.dev_attr.attr,
        &sensor_dev_attr_pwm1_auto_slope.dev_attr.attr,

        &sensor_dev_attr_pwm2_auto_point1_pwm.dev_attr.attr,    /* 11 */
        &sensor_dev_attr_pwm2_auto_point2_pwm.dev_attr.attr,
        &sensor_dev_attr_pwm2_auto_point3_pwm.dev_attr.attr,
        &sensor_dev_attr_pwm2_auto_point4_pwm.dev_attr.attr,
        &sensor_dev_attr_pwm2_auto_point1_temp.dev_attr.attr,
        &sensor_dev_attr_pwm2_auto_point1_temp_hyst.dev_attr.attr,
        &sensor_dev_attr_pwm2_auto_point2_temp.dev_attr.attr,
        &sensor_dev_attr_pwm2_auto_point3_temp.dev_attr.attr,
        &sensor_dev_attr_pwm2_auto_point4_temp.dev_attr.attr,
        &sensor_dev_attr_pwm2_auto_start.dev_attr.attr,
        &sensor_dev_attr_pwm2_auto_slope.dev_attr.attr,

        &sensor_dev_attr_pwm3_auto_point1_pwm.dev_attr.attr,    /* 22 */
        &sensor_dev_attr_pwm3_auto_point2_pwm.dev_attr.attr,
        &sensor_dev_attr_pwm3_auto_point3_pwm.dev_attr.attr,
        &sensor_dev_attr_pwm3_auto_point4_pwm.dev_attr.attr,
        &sensor_dev_attr_pwm3_auto_point1_temp.dev_attr.attr,
        &sensor_dev_attr_pwm3_auto_point1_temp_hyst.dev_attr.attr,
        &sensor_dev_attr_pwm3_auto_point2_temp.dev_attr.attr,
        &sensor_dev_attr_pwm3_auto_point3_temp.dev_attr.attr,
        &sensor_dev_attr_pwm3_auto_point4_temp.dev_attr.attr,
        &sensor_dev_attr_pwm3_auto_start.dev_attr.attr,
        &sensor_dev_attr_pwm3_auto_slope.dev_attr.attr,

        &sensor_dev_attr_pwm4_auto_point1_temp.dev_attr.attr,   /* 33 */
        &sensor_dev_attr_pwm4_auto_point1_temp_hyst.dev_attr.attr,
        &sensor_dev_attr_pwm4_auto_point2_temp.dev_attr.attr,
        &sensor_dev_attr_pwm4_auto_point3_temp.dev_attr.attr,
        &sensor_dev_attr_pwm4_auto_start.dev_attr.attr,
        &sensor_dev_attr_pwm4_auto_slope.dev_attr.attr,

        &sensor_dev_attr_pwm5_auto_point1_temp.dev_attr.attr,
        &sensor_dev_attr_pwm5_auto_point1_temp_hyst.dev_attr.attr,
        &sensor_dev_attr_pwm5_auto_point2_temp.dev_attr.attr,
        &sensor_dev_attr_pwm5_auto_point3_temp.dev_attr.attr,
        &sensor_dev_attr_pwm5_auto_start.dev_attr.attr,
        &sensor_dev_attr_pwm5_auto_slope.dev_attr.attr,

        &sensor_dev_attr_pwm6_auto_point1_temp.dev_attr.attr,
        &sensor_dev_attr_pwm6_auto_point1_temp_hyst.dev_attr.attr,
        &sensor_dev_attr_pwm6_auto_point2_temp.dev_attr.attr,
        &sensor_dev_attr_pwm6_auto_point3_temp.dev_attr.attr,
        &sensor_dev_attr_pwm6_auto_start.dev_attr.attr,
        &sensor_dev_attr_pwm6_auto_slope.dev_attr.attr,

        NULL,
};

static const struct attribute_group it87_group_auto_pwm = {
        .attrs = it87_attributes_auto_pwm,
        .is_visible = it87_auto_pwm_is_visible,
};

/* SuperIO detection - will change isa_address if a chip is found */
static int __init it87_find(int sioaddr, unsigned short *address,
                            struct it87_sio_data *sio_data)
{
        int err;
        u16 chip_type;
        const char *board_vendor, *board_name;
        const struct it87_devices *config;

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

        err = -ENODEV;
        chip_type = force_id ? force_id : superio_inw(sioaddr, DEVID);

        switch (chip_type) {
        case IT8705F_DEVID:
                sio_data->type = it87;
                break;
        case IT8712F_DEVID:
                sio_data->type = it8712;
                break;
        case IT8716F_DEVID:
        case IT8726F_DEVID:
                sio_data->type = it8716;
                break;
        case IT8718F_DEVID:
                sio_data->type = it8718;
                break;
        case IT8720F_DEVID:
                sio_data->type = it8720;
                break;
        case IT8721F_DEVID:
                sio_data->type = it8721;
                break;
        case IT8728F_DEVID:
                sio_data->type = it8728;
                break;
        case IT8732F_DEVID:
                sio_data->type = it8732;
                break;
        case IT8792E_DEVID:
                sio_data->type = it8792;
                break;
        case IT8771E_DEVID:
                sio_data->type = it8771;
                break;
        case IT8772E_DEVID:
                sio_data->type = it8772;
                break;
        case IT8781F_DEVID:
                sio_data->type = it8781;
                break;
        case IT8782F_DEVID:
                sio_data->type = it8782;
                break;
        case IT8783E_DEVID:
                sio_data->type = it8783;
                break;
        case IT8786E_DEVID:
                sio_data->type = it8786;
                break;
        case IT8790E_DEVID:
                sio_data->type = it8790;
                break;
        case IT8603E_DEVID:
        case IT8623E_DEVID:
                sio_data->type = it8603;
                break;
        case IT8620E_DEVID:
                sio_data->type = it8620;
                break;
        case IT8622E_DEVID:
                sio_data->type = it8622;
                break;
        case IT8628E_DEVID:
                sio_data->type = it8628;
                break;
        case 0xffff:    /* No device at all */
                goto exit;
        default:
                pr_debug("Unsupported chip (DEVID=0x%x)\n", chip_type);
                goto exit;
        }

        superio_select(sioaddr, PME);
        if (!(superio_inb(sioaddr, IT87_ACT_REG) & 0x01)) {
                pr_info("Device not activated, skipping\n");
                goto exit;
        }

        *address = superio_inw(sioaddr, IT87_BASE_REG) & ~(IT87_EXTENT - 1);
        if (*address == 0) {
                pr_info("Base address not set, skipping\n");
                goto exit;
        }

        err = 0;
        sio_data->sioaddr = sioaddr;
        sio_data->revision = superio_inb(sioaddr, DEVREV) & 0x0f;
        pr_info("Found IT%04x%s chip at 0x%x, revision %d\n", chip_type,
                it87_devices[sio_data->type].suffix,
                *address, sio_data->revision);

        config = &it87_devices[sio_data->type];

        /* in7 (VSB or VCCH5V) is always internal on some chips */
        if (has_in7_internal(config))
                sio_data->internal |= BIT(1);

        /* in8 (Vbat) is always internal */
        sio_data->internal |= BIT(2);

        /* in9 (AVCC3), always internal if supported */
        if (has_avcc3(config))
                sio_data->internal |= BIT(3); /* in9 is AVCC */
        else
                sio_data->skip_in |= BIT(9);

        if (!has_five_pwm(config))
                sio_data->skip_pwm |= BIT(3) | BIT(4) | BIT(5);
        else if (!has_six_pwm(config))
                sio_data->skip_pwm |= BIT(5);

        if (!has_vid(config))
                sio_data->skip_vid = 1;

        /* Read GPIO config and VID value from LDN 7 (GPIO) */
        if (sio_data->type == it87) {
                /* The IT8705F has a different LD number for GPIO */
                superio_select(sioaddr, 5);
                sio_data->beep_pin = superio_inb(sioaddr,
                                                 IT87_SIO_BEEP_PIN_REG) & 0x3f;
        } else if (sio_data->type == it8783) {
                int reg25, reg27, reg2a, reg2c, regef;

                superio_select(sioaddr, GPIO);

                reg25 = superio_inb(sioaddr, IT87_SIO_GPIO1_REG);
                reg27 = superio_inb(sioaddr, IT87_SIO_GPIO3_REG);
                reg2a = superio_inb(sioaddr, IT87_SIO_PINX1_REG);
                reg2c = superio_inb(sioaddr, IT87_SIO_PINX2_REG);
                regef = superio_inb(sioaddr, IT87_SIO_SPI_REG);

                /* Check if fan3 is there or not */
                if ((reg27 & BIT(0)) || !(reg2c & BIT(2)))
                        sio_data->skip_fan |= BIT(2);
                if ((reg25 & BIT(4)) ||
                    (!(reg2a & BIT(1)) && (regef & BIT(0))))
                        sio_data->skip_pwm |= BIT(2);

                /* Check if fan2 is there or not */
                if (reg27 & BIT(7))
                        sio_data->skip_fan |= BIT(1);
                if (reg27 & BIT(3))
                        sio_data->skip_pwm |= BIT(1);

                /* VIN5 */
                if ((reg27 & BIT(0)) || (reg2c & BIT(2)))
                        sio_data->skip_in |= BIT(5); /* No VIN5 */

                /* VIN6 */
                if (reg27 & BIT(1))
                        sio_data->skip_in |= BIT(6); /* No VIN6 */

                /*
                 * VIN7
                 * Does not depend on bit 2 of Reg2C, contrary to datasheet.
                 */
                if (reg27 & BIT(2)) {
                        /*
                         * The data sheet is a bit unclear regarding the
                         * internal voltage divider for VCCH5V. It says
                         * "This bit enables and switches VIN7 (pin 91) to the
                         * internal voltage divider for VCCH5V".
                         * This is different to other chips, where the internal
                         * voltage divider would connect VIN7 to an internal
                         * voltage source. Maybe that is the case here as well.
                         *
                         * Since we don't know for sure, re-route it if that is
                         * not the case, and ask the user to report if the
                         * resulting voltage is sane.
                         */
                        if (!(reg2c & BIT(1))) {
                                reg2c |= BIT(1);
                                superio_outb(sioaddr, IT87_SIO_PINX2_REG,
                                             reg2c);
                                sio_data->need_in7_reroute = true;
                                pr_notice("Routing internal VCCH5V to in7.\n");
                        }
                        pr_notice("in7 routed to internal voltage divider, with external pin disabled.\n");
                        pr_notice("Please report if it displays a reasonable voltage.\n");
                }

                if (reg2c & BIT(0))
                        sio_data->internal |= BIT(0);
                if (reg2c & BIT(1))
                        sio_data->internal |= BIT(1);

                sio_data->beep_pin = superio_inb(sioaddr,
                                                 IT87_SIO_BEEP_PIN_REG) & 0x3f;
        } else if (sio_data->type == it8603) {
                int reg27, reg29;

                superio_select(sioaddr, GPIO);

                reg27 = superio_inb(sioaddr, IT87_SIO_GPIO3_REG);

                /* Check if fan3 is there or not */
                if (reg27 & BIT(6))
                        sio_data->skip_pwm |= BIT(2);
                if (reg27 & BIT(7))
                        sio_data->skip_fan |= BIT(2);

                /* Check if fan2 is there or not */
                reg29 = superio_inb(sioaddr, IT87_SIO_GPIO5_REG);
                if (reg29 & BIT(1))
                        sio_data->skip_pwm |= BIT(1);
                if (reg29 & BIT(2))
                        sio_data->skip_fan |= BIT(1);

                sio_data->skip_in |= BIT(5); /* No VIN5 */
                sio_data->skip_in |= BIT(6); /* No VIN6 */

                sio_data->beep_pin = superio_inb(sioaddr,
                                                 IT87_SIO_BEEP_PIN_REG) & 0x3f;
        } else if (sio_data->type == it8620 || sio_data->type == it8628) {
                int reg;

                superio_select(sioaddr, GPIO);

                /* Check for pwm5 */
                reg = superio_inb(sioaddr, IT87_SIO_GPIO1_REG);
                if (reg & BIT(6))
                        sio_data->skip_pwm |= BIT(4);

                /* Check for fan4, fan5 */
                reg = superio_inb(sioaddr, IT87_SIO_GPIO2_REG);
                if (!(reg & BIT(5)))
                        sio_data->skip_fan |= BIT(3);
                if (!(reg & BIT(4)))
                        sio_data->skip_fan |= BIT(4);

                /* Check for pwm3, fan3 */
                reg = superio_inb(sioaddr, IT87_SIO_GPIO3_REG);
                if (reg & BIT(6))
                        sio_data->skip_pwm |= BIT(2);
                if (reg & BIT(7))
                        sio_data->skip_fan |= BIT(2);

                /* Check for pwm4 */
                reg = superio_inb(sioaddr, IT87_SIO_GPIO4_REG);
                if (reg & BIT(2))
                        sio_data->skip_pwm |= BIT(3);

                /* Check for pwm2, fan2 */
                reg = superio_inb(sioaddr, IT87_SIO_GPIO5_REG);
                if (reg & BIT(1))
                        sio_data->skip_pwm |= BIT(1);
                if (reg & BIT(2))
                        sio_data->skip_fan |= BIT(1);
                /* Check for pwm6, fan6 */
                if (!(reg & BIT(7))) {
                        sio_data->skip_pwm |= BIT(5);
                        sio_data->skip_fan |= BIT(5);
                }

                /* Check if AVCC is on VIN3 */
                reg = superio_inb(sioaddr, IT87_SIO_PINX2_REG);
                if (reg & BIT(0))
                        sio_data->internal |= BIT(0);
                else
                        sio_data->skip_in |= BIT(9);

                sio_data->beep_pin = superio_inb(sioaddr,
                                                 IT87_SIO_BEEP_PIN_REG) & 0x3f;
        } else if (sio_data->type == it8622) {
                int reg;

                superio_select(sioaddr, GPIO);

                /* Check for pwm4, fan4 */
                reg = superio_inb(sioaddr, IT87_SIO_GPIO1_REG);
                if (reg & BIT(6))
                        sio_data->skip_fan |= BIT(3);
                if (reg & BIT(5))
                        sio_data->skip_pwm |= BIT(3);

                /* Check for pwm3, fan3, pwm5, fan5 */
                reg = superio_inb(sioaddr, IT87_SIO_GPIO3_REG);
                if (reg & BIT(6))
                        sio_data->skip_pwm |= BIT(2);
                if (reg & BIT(7))
                        sio_data->skip_fan |= BIT(2);
                if (reg & BIT(3))
                        sio_data->skip_pwm |= BIT(4);
                if (reg & BIT(1))
                        sio_data->skip_fan |= BIT(4);

                /* Check for pwm2, fan2 */
                reg = superio_inb(sioaddr, IT87_SIO_GPIO5_REG);
                if (reg & BIT(1))
                        sio_data->skip_pwm |= BIT(1);
                if (reg & BIT(2))
                        sio_data->skip_fan |= BIT(1);

                /* Check for AVCC */
                reg = superio_inb(sioaddr, IT87_SIO_PINX2_REG);
                if (!(reg & BIT(0)))
                        sio_data->skip_in |= BIT(9);

                sio_data->beep_pin = superio_inb(sioaddr,
                                                 IT87_SIO_BEEP_PIN_REG) & 0x3f;
        } else {
                int reg;
                bool uart6;

                superio_select(sioaddr, GPIO);

                /* Check for fan4, fan5 */
                if (has_five_fans(config)) {
                        reg = superio_inb(sioaddr, IT87_SIO_GPIO2_REG);
                        switch (sio_data->type) {
                        case it8718:
                                if (reg & BIT(5))
                                        sio_data->skip_fan |= BIT(3);
                                if (reg & BIT(4))
                                        sio_data->skip_fan |= BIT(4);
                                break;
                        case it8720:
                        case it8721:
                        case it8728:
                                if (!(reg & BIT(5)))
                                        sio_data->skip_fan |= BIT(3);
                                if (!(reg & BIT(4)))
                                        sio_data->skip_fan |= BIT(4);
                                break;
                        default:
                                break;
                        }
                }

                reg = superio_inb(sioaddr, IT87_SIO_GPIO3_REG);
                if (!sio_data->skip_vid) {
                        /* We need at least 4 VID pins */
                        if (reg & 0x0f) {
                                pr_info("VID is disabled (pins used for GPIO)\n");
                                sio_data->skip_vid = 1;
                        }
                }

                /* Check if fan3 is there or not */
                if (reg & BIT(6))
                        sio_data->skip_pwm |= BIT(2);
                if (reg & BIT(7))
                        sio_data->skip_fan |= BIT(2);

                /* Check if fan2 is there or not */
                reg = superio_inb(sioaddr, IT87_SIO_GPIO5_REG);
                if (reg & BIT(1))
                        sio_data->skip_pwm |= BIT(1);
                if (reg & BIT(2))
                        sio_data->skip_fan |= BIT(1);

                if ((sio_data->type == it8718 || sio_data->type == it8720) &&
                    !(sio_data->skip_vid))
                        sio_data->vid_value = superio_inb(sioaddr,
                                                          IT87_SIO_VID_REG);

                reg = superio_inb(sioaddr, IT87_SIO_PINX2_REG);

                uart6 = sio_data->type == it8782 && (reg & BIT(2));

                /*
                 * The IT8720F has no VIN7 pin, so VCCH5V should always be
                 * routed internally to VIN7 with an internal divider.
                 * Curiously, there still is a configuration bit to control
                 * this, which means it can be set incorrectly. And even
                 * more curiously, many boards out there are improperly
                 * configured, even though the IT8720F datasheet claims
                 * that the internal routing of VCCH5V to VIN7 is the default
                 * setting. So we force the internal routing in this case.
                 *
                 * On IT8782F, VIN7 is multiplexed with one of the UART6 pins.
                 * If UART6 is enabled, re-route VIN7 to the internal divider
                 * if that is not already the case.
                 */
                if ((sio_data->type == it8720 || uart6) && !(reg & BIT(1))) {
                        reg |= BIT(1);
                        superio_outb(sioaddr, IT87_SIO_PINX2_REG, reg);
                        sio_data->need_in7_reroute = true;
                        pr_notice("Routing internal VCCH5V to in7\n");
                }
                if (reg & BIT(0))
                        sio_data->internal |= BIT(0);
                if (reg & BIT(1))
                        sio_data->internal |= BIT(1);

                /*
                 * On IT8782F, UART6 pins overlap with VIN5, VIN6, and VIN7.
                 * While VIN7 can be routed to the internal voltage divider,
                 * VIN5 and VIN6 are not available if UART6 is enabled.
                 *
                 * Also, temp3 is not available if UART6 is enabled and TEMPIN3
                 * is the temperature source. Since we can not read the
                 * temperature source here, skip_temp is preliminary.
                 */
                if (uart6) {
                        sio_data->skip_in |= BIT(5) | BIT(6);
                        sio_data->skip_temp |= BIT(2);
                }

                sio_data->beep_pin = superio_inb(sioaddr,
                                                 IT87_SIO_BEEP_PIN_REG) & 0x3f;
        }
        if (sio_data->beep_pin)
                pr_info("Beeping is supported\n");

        /* Disable specific features based on DMI strings */
        board_vendor = dmi_get_system_info(DMI_BOARD_VENDOR);
        board_name = dmi_get_system_info(DMI_BOARD_NAME);
        if (board_vendor && board_name) {
                if (strcmp(board_vendor, "nVIDIA") == 0 &&
                    strcmp(board_name, "FN68PT") == 0) {
                        /*
                         * On the Shuttle SN68PT, FAN_CTL2 is apparently not
                         * connected to a fan, but to something else. One user
                         * has reported instant system power-off when changing
                         * the PWM2 duty cycle, so we disable it.
                         * I use the board name string as the trigger in case
                         * the same board is ever used in other systems.
                         */
                        pr_info("Disabling pwm2 due to hardware constraints\n");
                        sio_data->skip_pwm = BIT(1);
                }
        }

exit:
        superio_exit(sioaddr);
        return err;
}

/*
 * Some chips seem to have default value 0xff for all limit
 * registers. For low voltage limits it makes no sense and triggers
 * alarms, so change to 0 instead. For high temperature limits, it
 * means -1 degree C, which surprisingly doesn't trigger an alarm,
 * but is still confusing, so change to 127 degrees C.
 */
static void it87_check_limit_regs(struct it87_data *data)
{
        int i, reg;

        for (i = 0; i < NUM_VIN_LIMIT; i++) {
                reg = it87_read_value(data, IT87_REG_VIN_MIN(i));
                if (reg == 0xff)
                        it87_write_value(data, IT87_REG_VIN_MIN(i), 0);
        }
        for (i = 0; i < NUM_TEMP_LIMIT; i++) {
                reg = it87_read_value(data, IT87_REG_TEMP_HIGH(i));
                if (reg == 0xff)
                        it87_write_value(data, IT87_REG_TEMP_HIGH(i), 127);
        }
}

/* Check if voltage monitors are reset manually or by some reason */
static void it87_check_voltage_monitors_reset(struct it87_data *data)
{
        int reg;

        reg = it87_read_value(data, IT87_REG_VIN_ENABLE);
        if ((reg & 0xff) == 0) {
                /* Enable all voltage monitors */
                it87_write_value(data, IT87_REG_VIN_ENABLE, 0xff);
        }
}

/* Check if tachometers are reset manually or by some reason */
static void it87_check_tachometers_reset(struct platform_device *pdev)
{
        struct it87_sio_data *sio_data = dev_get_platdata(&pdev->dev);
        struct it87_data *data = platform_get_drvdata(pdev);
        u8 mask, fan_main_ctrl;

        mask = 0x70 & ~(sio_data->skip_fan << 4);
        fan_main_ctrl = it87_read_value(data, IT87_REG_FAN_MAIN_CTRL);
        if ((fan_main_ctrl & mask) == 0) {
                /* Enable all fan tachometers */
                fan_main_ctrl |= mask;
                it87_write_value(data, IT87_REG_FAN_MAIN_CTRL,
                                 fan_main_ctrl);
        }
}

/* Set tachometers to 16-bit mode if needed */
static void it87_check_tachometers_16bit_mode(struct platform_device *pdev)
{
        struct it87_data *data = platform_get_drvdata(pdev);
        int reg;

        if (!has_fan16_config(data))
                return;

        reg = it87_read_value(data, IT87_REG_FAN_16BIT);
        if (~reg & 0x07 & data->has_fan) {
                dev_dbg(&pdev->dev,
                        "Setting fan1-3 to 16-bit mode\n");
                it87_write_value(data, IT87_REG_FAN_16BIT,
                                 reg | 0x07);
        }
}

static void it87_start_monitoring(struct it87_data *data)
{
        it87_write_value(data, IT87_REG_CONFIG,
                         (it87_read_value(data, IT87_REG_CONFIG) & 0x3e)
                         | (update_vbat ? 0x41 : 0x01));
}

/* Called when we have found a new IT87. */
static void it87_init_device(struct platform_device *pdev)
{
        struct it87_sio_data *sio_data = dev_get_platdata(&pdev->dev);
        struct it87_data *data = platform_get_drvdata(pdev);
        int tmp, i;

        /*
         * For each PWM channel:
         * - If it is in automatic mode, setting to manual mode should set
         *   the fan to full speed by default.
         * - If it is in manual mode, we need a mapping to temperature
         *   channels to use when later setting to automatic mode later.
         *   Use a 1:1 mapping by default (we are clueless.)
         * In both cases, the value can (and should) be changed by the user
         * prior to switching to a different mode.
         * Note that this is no longer needed for the IT8721F and later, as
         * these have separate registers for the temperature mapping and the
         * manual duty cycle.
         */
        for (i = 0; i < NUM_AUTO_PWM; i++) {
                data->pwm_temp_map[i] = i;
                data->pwm_duty[i] = 0x7f;       /* Full speed */
                data->auto_pwm[i][3] = 0x7f;    /* Full speed, hard-coded */
        }

        it87_check_limit_regs(data);

        /*
         * Temperature channels are not forcibly enabled, as they can be
         * set to two different sensor types and we can't guess which one
         * is correct for a given system. These channels can be enabled at
         * run-time through the temp{1-3}_type sysfs accessors if needed.
         */

        it87_check_voltage_monitors_reset(data);

        it87_check_tachometers_reset(pdev);

        data->fan_main_ctrl = it87_read_value(data, IT87_REG_FAN_MAIN_CTRL);
        data->has_fan = (data->fan_main_ctrl >> 4) & 0x07;

        it87_check_tachometers_16bit_mode(pdev);

        /* Check for additional fans */
        if (has_five_fans(data)) {
                tmp = it87_read_value(data, IT87_REG_FAN_16BIT);

                if (tmp & BIT(4))
                        data->has_fan |= BIT(3); /* fan4 enabled */
                if (tmp & BIT(5))
                        data->has_fan |= BIT(4); /* fan5 enabled */
                if (has_six_fans(data) && (tmp & BIT(2)))
                        data->has_fan |= BIT(5); /* fan6 enabled */
        }

        /* Fan input pins may be used for alternative functions */
        data->has_fan &= ~sio_data->skip_fan;

        /* Check if pwm5, pwm6 are enabled */
        if (has_six_pwm(data)) {
                /* The following code may be IT8620E specific */
                tmp = it87_read_value(data, IT87_REG_FAN_DIV);
                if ((tmp & 0xc0) == 0xc0)
                        sio_data->skip_pwm |= BIT(4);
                if (!(tmp & BIT(3)))
                        sio_data->skip_pwm |= BIT(5);
        }

        it87_start_monitoring(data);
}

/* Return 1 if and only if the PWM interface is safe to use */
static int it87_check_pwm(struct device *dev)
{
        struct it87_data *data = dev_get_drvdata(dev);
        /*
         * Some BIOSes fail to correctly configure the IT87 fans. All fans off
         * and polarity set to active low is sign that this is the case so we
         * disable pwm control to protect the user.
         */
        int tmp = it87_read_value(data, IT87_REG_FAN_CTL);

        if ((tmp & 0x87) == 0) {
                if (fix_pwm_polarity) {
                        /*