it87.c

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/*
 *  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: 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
 *            IT8758E  Super I/O chip w/LPC interface
 *            IT8782F  Super I/O chip w/LPC interface
 *            IT8783E/F Super I/O chip w/LPC interface
 *            Sis950   A clone of the IT8705F
 *
 *  Copyright (C) 2001 Chris Gauthron
 *  Copyright (C) 2005-2010 Jean Delvare <[email protected]>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/platform_device.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/hwmon-vid.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/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, it8782,
         it8783 };

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 *pdev;

#define REG 0x2e    /* The register to read/write */
#define DEV 0x07    /* Register: Logical device select */
#define VAL 0x2f    /* The value to read/write */
#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 reg)
{
    outb(reg, REG);
    return inb(VAL);
}

static inline void superio_outb(int reg, int val)
{
    outb(reg, REG);
    outb(val, VAL);
}

static int superio_inw(int reg)
{
    int val;
    outb(reg++, REG);
    val = inb(VAL) << 8;
    outb(reg, REG);
    val |= inb(VAL);
    return val;
}

static inline void superio_select(int ldn)
{
    outb(DEV, REG);
    outb(ldn, VAL);
}

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

    outb(0x87, REG);
    outb(0x01, REG);
    outb(0x55, REG);
    outb(0x55, REG);
    return 0;
}

static inline void superio_exit(void)
{
    outb(0x02, REG);
    outb(0x02, VAL);
    release_region(REG, 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 IT8782F_DEVID 0x8782
#define IT8783E_DEVID 0x8783
#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_GPIO3_REG  0x27
#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: 9 voltage (0 to 7, battery), 3 temp (1 to 3), 3 fan (1 to 3) */

static const u8 IT87_REG_FAN[]      = { 0x0d, 0x0e, 0x0f, 0x80, 0x82 };
static const u8 IT87_REG_FAN_MIN[]  = { 0x10, 0x11, 0x12, 0x84, 0x86 };
static const u8 IT87_REG_FANX[]     = { 0x18, 0x19, 0x1a, 0x81, 0x83 };
static const u8 IT87_REG_FANX_MIN[] = { 0x1b, 0x1c, 0x1d, 0x85, 0x87 };
#define IT87_REG_FAN_MAIN_CTRL 0x13
#define IT87_REG_FAN_CTL       0x14
#define IT87_REG_PWM(nr)       (0x15 + (nr))
#define IT87_REG_PWM_DUTY(nr)  (0x63 + (nr) * 8)

#define IT87_REG_VIN(nr)       (0x20 + (nr))
#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

#define IT87_REG_AUTO_TEMP(nr, i) (0x60 + (nr) * 8 + (i))
#define IT87_REG_AUTO_PWM(nr, i)  (0x65 + (nr) * 8 + (i))


struct it87_sio_data {
    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 */
    /* 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 {
    struct device *hwmon_dev;
    enum chips type;
    u8 revision;

    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 */
    u8 in[9];       /* Register value */
    u8 in_max[8];       /* Register value */
    u8 in_min[8];       /* Register value */
    u8 has_fan;     /* Bitfield, fans enabled */
    u16 fan[5];     /* Register values, possibly combined */
    u16 fan_min[5];     /* Register values, possibly combined */
    u8 has_temp;        /* Bitfield, temp sensors enabled */
    s8 temp[3];     /* Register value */
    s8 temp_high[3];    /* Register value */
    s8 temp_low[3];     /* Register value */
    u8 sensor;      /* Register value */
    u8 fan_div[3];      /* Register encoding, shifted right */
    u8 vid;         /* Register encoding, combined */
    u8 vrm;
    u32 alarms;     /* Register encoding, combined */
    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 pwm_ctrl[3];     /* Register value */
    u8 pwm_duty[3];     /* Manual PWM value set by user */
    u8 pwm_temp_map[3]; /* PWM to temp. chan. mapping (bits 1-0) */

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

static inline int has_12mv_adc(const struct it87_data *data)
{
    /*
     * IT8721F and later have a 12 mV ADC, also with internal scaling
     * on selected inputs.
     */
    return data->type == it8721
        || data->type == it8728;
}

static inline int has_newer_autopwm(const struct it87_data *data)
{
    /*
     * IT8721F and later have separate registers for the temperature
     * mapping and the manual duty cycle.
     */
    return data->type == it8721
        || data->type == it8728;
}

static int adc_lsb(const struct it87_data *data, int nr)
{
    int lsb = has_12mv_adc(data) ? 12 : 16;
    if (data->in_scaled & (1 << nr))
        lsb <<= 1;
    return lsb;
}

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

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

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

static inline u16 FAN16_TO_REG(long rpm)
{
    if (rpm == 0)
        return 0xffff;
    return SENSORS_LIMIT((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) (SENSORS_LIMIT(((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) (1 << (val))

static const unsigned int pwm_freq[8] = {
    48000000 / 128,
    24000000 / 128,
    12000000 / 128,
    8000000 / 128,
    6000000 / 128,
    3000000 / 128,
    1500000 / 128,
    750000 / 128,
};

static inline int has_16bit_fans(const struct it87_data *data)
{
    /*
     * IT8705F Datasheet 0.4.1, 3h == Version G.
     * IT8712F Datasheet 0.9.1, section 8.3.5 indicates 8h == Version J.
     * These are the first revisions with 16-bit tachometer support.
     */
    return (data->type == it87 && data->revision >= 0x03)
        || (data->type == it8712 && data->revision >= 0x08)
        || data->type == it8716
        || data->type == it8718
        || data->type == it8720
        || data->type == it8721
        || data->type == it8728
        || data->type == it8782
        || data->type == it8783;
}

static inline int has_old_autopwm(const struct it87_data *data)
{
    /*
     * The old automatic fan speed control interface is implemented
     * by IT8705F chips up to revision F and IT8712F chips up to
     * revision G.
     */
    return (data->type == it87 && data->revision < 0x03)
        || (data->type == it8712 && data->revision < 0x08);
}

static int it87_probe(struct platform_device *pdev);
static int __devexit it87_remove(struct platform_device *pdev);

static int it87_read_value(struct it87_data *data, u8 reg);
static void it87_write_value(struct it87_data *data, u8 reg, u8 value);
static struct it87_data *it87_update_device(struct device *dev);
static int it87_check_pwm(struct device *dev);
static void it87_init_device(struct platform_device *pdev);


static struct platform_driver it87_driver = {
    .driver = {
        .owner  = THIS_MODULE,
        .name   = DRVNAME,
    },
    .probe  = it87_probe,
    .remove = __devexit_p(it87_remove),
};

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

    struct it87_data *data = it87_update_device(dev);
    return sprintf(buf, "%d\n", in_from_reg(data, nr, data->in[nr]));
}

static ssize_t show_in_min(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);
    return sprintf(buf, "%d\n", in_from_reg(data, nr, data->in_min[nr]));
}

static ssize_t show_in_max(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);
    return sprintf(buf, "%d\n", in_from_reg(data, nr, data->in_max[nr]));
}

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

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

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

    mutex_lock(&data->update_lock);
    data->in_min[nr] = in_to_reg(data, nr, val);
    it87_write_value(data, IT87_REG_VIN_MIN(nr),
            data->in_min[nr]);
    mutex_unlock(&data->update_lock);
    return count;
}
static ssize_t set_in_max(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);
    unsigned long val;

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

    mutex_lock(&data->update_lock);
    data->in_max[nr] = in_to_reg(data, nr, val);
    it87_write_value(data, IT87_REG_VIN_MAX(nr),
            data->in_max[nr]);
    mutex_unlock(&data->update_lock);
    return count;
}

#define show_in_offset(offset)                  \
static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO,      \
        show_in, NULL, offset);

#define limit_in_offset(offset)                 \
static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,  \
        show_in_min, set_in_min, offset);       \
static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,  \
        show_in_max, set_in_max, offset);

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

/* 3 temperatures */
static ssize_t show_temp(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);
    return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
}
static ssize_t show_temp_max(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);
    return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[nr]));
}
static ssize_t show_temp_min(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);
    return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_low[nr]));
}
static ssize_t set_temp_max(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;

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

    mutex_lock(&data->update_lock);
    data->temp_high[nr] = TEMP_TO_REG(val);
    it87_write_value(data, IT87_REG_TEMP_HIGH(nr), data->temp_high[nr]);
    mutex_unlock(&data->update_lock);
    return count;
}
static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
        const char *buf, size_t count)
{
    struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
    int nr = sensor_attr->index;

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

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

    mutex_lock(&data->update_lock);
    data->temp_low[nr] = TEMP_TO_REG(val);
    it87_write_value(data, IT87_REG_TEMP_LOW(nr), data->temp_low[nr]);
    mutex_unlock(&data->update_lock);
    return count;
}
#define show_temp_offset(offset)                    \
static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO,        \
        show_temp, NULL, offset - 1);               \
static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,    \
        show_temp_max, set_temp_max, offset - 1);       \
static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR,    \
        show_temp_min, set_temp_min, offset - 1);

show_temp_offset(1);
show_temp_offset(2);
show_temp_offset(3);

static ssize_t show_sensor(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 */

    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_sensor(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;

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

    reg = it87_read_value(data, IT87_REG_TEMP_ENABLE);
    reg &= ~(1 << nr);
    reg &= ~(8 << nr);
    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; 0 = disabled */
    if (val == 3)
        reg |= 1 << nr;
    else if (val == 4)
        reg |= 8 << nr;
    else if (val != 0)
        return -EINVAL;

    mutex_lock(&data->update_lock);
    data->sensor = reg;
    it87_write_value(data, IT87_REG_TEMP_ENABLE, data->sensor);
    data->valid = 0;    /* Force cache refresh */
    mutex_unlock(&data->update_lock);
    return count;
}
#define show_sensor_offset(offset)                  \
static SENSOR_DEVICE_ATTR(temp##offset##_type, S_IRUGO | S_IWUSR,   \
        show_sensor, set_sensor, offset - 1);

show_sensor_offset(1);
show_sensor_offset(2);
show_sensor_offset(3);

/* 3 Fans */

static int pwm_mode(const struct it87_data *data, int nr)
{
    int ctrl = data->fan_main_ctrl & (1 << nr);

    if (ctrl == 0)                  /* Full speed */
        return 0;
    if (data->pwm_ctrl[nr] & 0x80)          /* Automatic mode */
        return 2;
    else                        /* Manual mode */
        return 1;
}

static ssize_t show_fan(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);
    return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
                DIV_FROM_REG(data->fan_div[nr])));
}
static ssize_t show_fan_min(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);
    return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
                DIV_FROM_REG(data->fan_div[nr])));
}
static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
        char *buf)
{
    struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
    int nr = sensor_attr->index;

    struct it87_data *data = it87_update_device(dev);
    return sprintf(buf, "%d\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);
    int nr = sensor_attr->index;

    struct it87_data *data = it87_update_device(dev);
    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);
    int nr = sensor_attr->index;

    struct it87_data *data = it87_update_device(dev);
    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 it87_data *data = it87_update_device(dev);
    int index = (data->fan_ctl >> 4) & 0x07;

    return sprintf(buf, "%u\n", pwm_freq[index]);
}
static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
        const char *buf, size_t count)
{
    struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
    int nr = sensor_attr->index;

    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);
    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_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
    it87_write_value(data, IT87_REG_FAN_MIN[nr], data->fan_min[nr]);
    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);
    int nr = sensor_attr->index;

    struct it87_data *data = dev_get_drvdata(dev);
    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_min[nr], 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_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
    it87_write_value(data, IT87_REG_FAN_MIN[nr], data->fan_min[nr]);

    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;
        }
    }

    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);
    int nr = sensor_attr->index;

    struct it87_data *data = dev_get_drvdata(dev);
    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) {
        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 | (1 << nr));
        /* set on/off mode */
        data->fan_main_ctrl &= ~(1 << nr);
        it87_write_value(data, IT87_REG_FAN_MAIN_CTRL,
                 data->fan_main_ctrl);
    } else {
        if (val == 1)               /* Manual mode */
            data->pwm_ctrl[nr] = has_newer_autopwm(data) ?
                         data->pwm_temp_map[nr] :
                         data->pwm_duty[nr];
        else                    /* Automatic mode */
            data->pwm_ctrl[nr] = 0x80 | data->pwm_temp_map[nr];
        it87_write_value(data, IT87_REG_PWM(nr), data->pwm_ctrl[nr]);
        /* set SmartGuardian mode */
        data->fan_main_ctrl |= (1 << 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);
    int nr = sensor_attr->index;

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

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

    mutex_lock(&data->update_lock);
    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 it87_data *data = dev_get_drvdata(dev);
    unsigned long val;
    int i;

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

    /* 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);
    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);
    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);
    int nr = sensor_attr->index;

    struct it87_data *data = it87_update_device(dev);
    int map;

    if (data->pwm_temp_map[nr] < 3)
        map = 1 << data->pwm_temp_map[nr];
    else
        map = 0;            /* Should never happen */
    return sprintf(buf, "%d\n", 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);
    int nr = sensor_attr->index;

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

    /*
     * This check can go away if we ever support automatic fan speed
     * control on newer chips.
     */
    if (!has_old_autopwm(data)) {
        dev_notice(dev, "Mapping change disabled for safety reasons\n");
        return -EINVAL;
    }

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

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

    mutex_lock(&data->update_lock);
    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] = 0x80 | 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;
    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);
    it87_write_value(data, IT87_REG_AUTO_PWM(nr, point),
             data->auto_pwm[nr][point]);
    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;

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

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;

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

    mutex_lock(&data->update_lock);
    data->auto_temp[nr][point] = TEMP_TO_REG(val);
    it87_write_value(data, IT87_REG_AUTO_TEMP(nr, point),
             data->auto_temp[nr][point]);
    mutex_unlock(&data->update_lock);
    return count;
}

#define show_fan_offset(offset)                 \
static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO,     \
        show_fan, NULL, offset - 1);            \
static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
        show_fan_min, set_fan_min, offset - 1);     \
static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
        show_fan_div, set_fan_div, offset - 1);

show_fan_offset(1);
show_fan_offset(2);
show_fan_offset(3);

#define show_pwm_offset(offset)                     \
static SENSOR_DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR,  \
        show_pwm_enable, set_pwm_enable, offset - 1);       \
static SENSOR_DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR,       \
        show_pwm, set_pwm, offset - 1);             \
static DEVICE_ATTR(pwm##offset##_freq,                  \
        (offset == 1 ? S_IRUGO | S_IWUSR : S_IRUGO),        \
        show_pwm_freq, (offset == 1 ? set_pwm_freq : NULL));    \
static SENSOR_DEVICE_ATTR(pwm##offset##_auto_channels_temp,     \
        S_IRUGO | S_IWUSR, show_pwm_temp_map, set_pwm_temp_map, \
        offset - 1);                        \
static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point1_pwm,      \
        S_IRUGO | S_IWUSR, show_auto_pwm, set_auto_pwm,     \
        offset - 1, 0);                     \
static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point2_pwm,      \
        S_IRUGO | S_IWUSR, show_auto_pwm, set_auto_pwm,     \
        offset - 1, 1);                     \
static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point3_pwm,      \
        S_IRUGO | S_IWUSR, show_auto_pwm, set_auto_pwm,     \
        offset - 1, 2);                     \
static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point4_pwm,      \
        S_IRUGO, show_auto_pwm, NULL, offset - 1, 3);       \
static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point1_temp,     \
        S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp,   \
        offset - 1, 1);                     \
static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point1_temp_hyst,    \
        S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp,   \
        offset - 1, 0);                     \
static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point2_temp,     \
        S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp,   \
        offset - 1, 2);                     \
static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point3_temp,     \
        S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp,   \
        offset - 1, 3);                     \
static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point4_temp,     \
        S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp,   \
        offset - 1, 4);

show_pwm_offset(1);
show_pwm_offset(2);
show_pwm_offset(3);

/* A different set of callbacks for 16-bit fans */
static ssize_t show_fan16(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);
    return sprintf(buf, "%d\n", FAN16_FROM_REG(data->fan[nr]));
}

static ssize_t show_fan16_min(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);
    return sprintf(buf, "%d\n", FAN16_FROM_REG(data->fan_min[nr]));
}

static ssize_t set_fan16_min(struct device *dev, struct device_attribute *attr,
        const char *buf, size_t count)
{
    struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
    int nr = sensor_attr->index;
    struct it87_data *data = dev_get_drvdata(dev);
    long val;

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

    mutex_lock(&data->update_lock);
    data->fan_min[nr] = FAN16_TO_REG(val);
    it87_write_value(data, IT87_REG_FAN_MIN[nr],
             data->fan_min[nr] & 0xff);
    it87_write_value(data, IT87_REG_FANX_MIN[nr],
             data->fan_min[nr] >> 8);
    mutex_unlock(&data->update_lock);
    return count;
}

/*
 * We want to use the same sysfs file names as 8-bit fans, but we need
 * different variable names, so we have to use SENSOR_ATTR instead of
 * SENSOR_DEVICE_ATTR.
 */
#define show_fan16_offset(offset) \
static struct sensor_device_attribute sensor_dev_attr_fan##offset##_input16 \
    = SENSOR_ATTR(fan##offset##_input, S_IRUGO,     \
        show_fan16, NULL, offset - 1);          \
static struct sensor_device_attribute sensor_dev_attr_fan##offset##_min16 \
    = SENSOR_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
        show_fan16_min, set_fan16_min, offset - 1)

show_fan16_offset(1);
show_fan16_offset(2);
show_fan16_offset(3);
show_fan16_offset(4);
show_fan16_offset(5);

/* Alarms */
static ssize_t show_alarms(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(alarms, S_IRUGO, show_alarms, NULL);

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

    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 |= 1 << 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(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)
{
    int bitnr = to_sensor_dev_attr(attr)->index;
    struct it87_data *data = it87_update_device(dev);
    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 |= (1 << bitnr);
    else
        data->beeps &= ~(1 << 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(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 show_vrm_reg(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 store_vrm_reg(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(vrm, S_IRUGO | S_IWUSR, show_vrm_reg, store_vrm_reg);

static ssize_t show_vid_reg(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(cpu0_vid, S_IRUGO, show_vid_reg, NULL);

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

    return sprintf(buf, "%s\n", has_12mv_adc(data) ? labels_it8721[nr]
                               : labels[nr]);
}
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);

static ssize_t show_name(struct device *dev, struct device_attribute
             *devattr, char *buf)
{
    struct it87_data *data = dev_get_drvdata(dev);
    return sprintf(buf, "%s\n", data->name);
}
static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);

static struct attribute *it87_attributes_in[9][5] = {
{
    &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,
    NULL
}, {
    &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,
    NULL
}, {
    &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,
    NULL
}, {
    &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,
    NULL
}, {
    &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,
    NULL
}, {
    &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,
    NULL
}, {
    &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,
    NULL
}, {
    &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,
    NULL
}, {
    &sensor_dev_attr_in8_input.dev_attr.attr,
    NULL
} };

static const struct attribute_group it87_group_in[9] = {
    { .attrs = it87_attributes_in[0] },
    { .attrs = it87_attributes_in[1] },
    { .attrs = it87_attributes_in[2] },
    { .attrs = it87_attributes_in[3] },
    { .attrs = it87_attributes_in[4] },
    { .attrs = it87_attributes_in[5] },
    { .attrs = it87_attributes_in[6] },
    { .attrs = it87_attributes_in[7] },
    { .attrs = it87_attributes_in[8] },
};

static struct attribute *it87_attributes_temp[3][6] = {
{
    &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,
    NULL
} , {
    &sensor_dev_attr_temp2_input.dev_attr.attr,
    &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,
    NULL
} , {
    &sensor_dev_attr_temp3_input.dev_attr.attr,
    &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,
    NULL
} };

static const struct attribute_group it87_group_temp[3] = {
    { .attrs = it87_attributes_temp[0] },
    { .attrs = it87_attributes_temp[1] },
    { .attrs = it87_attributes_temp[2] },
};

static struct attribute *it87_attributes[] = {
    &dev_attr_alarms.attr,
    &sensor_dev_attr_intrusion0_alarm.dev_attr.attr,
    &dev_attr_name.attr,
    NULL
};

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

static struct attribute *it87_attributes_in_beep[] = {
    &sensor_dev_attr_in0_beep.dev_attr.attr,
    &sensor_dev_attr_in1_beep.dev_attr.attr,
    &sensor_dev_attr_in2_beep.dev_attr.attr,
    &sensor_dev_attr_in3_beep.dev_attr.attr,
    &sensor_dev_attr_in4_beep.dev_attr.attr,
    &sensor_dev_attr_in5_beep.dev_attr.attr,
    &sensor_dev_attr_in6_beep.dev_attr.attr,
    &sensor_dev_attr_in7_beep.dev_attr.attr,
    NULL
};

static struct attribute *it87_attributes_temp_beep[] = {
    &sensor_dev_attr_temp1_beep.dev_attr.attr,
    &sensor_dev_attr_temp2_beep.dev_attr.attr,
    &sensor_dev_attr_temp3_beep.dev_attr.attr,
};

static struct attribute *it87_attributes_fan16[5][3+1] = { {
    &sensor_dev_attr_fan1_input16.dev_attr.attr,
    &sensor_dev_attr_fan1_min16.dev_attr.attr,
    &sensor_dev_attr_fan1_alarm.dev_attr.attr,
    NULL
}, {
    &sensor_dev_attr_fan2_input16.dev_attr.attr,
    &sensor_dev_attr_fan2_min16.dev_attr.attr,
    &sensor_dev_attr_fan2_alarm.dev_attr.attr,
    NULL
}, {
    &sensor_dev_attr_fan3_input16.dev_attr.attr,
    &sensor_dev_attr_fan3_min16.dev_attr.attr,
    &sensor_dev_attr_fan3_alarm.dev_attr.attr,
    NULL
}, {
    &sensor_dev_attr_fan4_input16.dev_attr.attr,
    &sensor_dev_attr_fan4_min16.dev_attr.attr,
    &sensor_dev_attr_fan4_alarm.dev_attr.attr,
    NULL
}, {
    &sensor_dev_attr_fan5_input16.dev_attr.attr,
    &sensor_dev_attr_fan5_min16.dev_attr.attr,
    &sensor_dev_attr_fan5_alarm.dev_attr.attr,
    NULL
} };

static const struct attribute_group it87_group_fan16[5] = {
    { .attrs = it87_attributes_fan16[0] },
    { .attrs = it87_attributes_fan16[1] },
    { .attrs = it87_attributes_fan16[2] },
    { .attrs = it87_attributes_fan16[3] },
    { .attrs = it87_attributes_fan16[4] },
};

static struct attribute *it87_attributes_fan[3][4+1] = { {
    &sensor_dev_attr_fan1_input.dev_attr.attr,
    &sensor_dev_attr_fan1_min.dev_attr.attr,
    &sensor_dev_attr_fan1_div.dev_attr.attr,
    &sensor_dev_attr_fan1_alarm.dev_attr.attr,
    NULL
}, {
    &sensor_dev_attr_fan2_input.dev_attr.attr,
    &sensor_dev_attr_fan2_min.dev_attr.attr,
    &sensor_dev_attr_fan2_div.dev_attr.attr,
    &sensor_dev_attr_fan2_alarm.dev_attr.attr,
    NULL
}, {
    &sensor_dev_attr_fan3_input.dev_attr.attr,
    &sensor_dev_attr_fan3_min.dev_attr.attr,
    &sensor_dev_attr_fan3_div.dev_attr.attr,
    &sensor_dev_attr_fan3_alarm.dev_attr.attr,
    NULL
} };

static const struct attribute_group it87_group_fan[3] = {
    { .attrs = it87_attributes_fan[0] },
    { .attrs = it87_attributes_fan[1] },
    { .attrs = it87_attributes_fan[2] },
};

static const struct attribute_group *
it87_get_fan_group(const struct it87_data *data)
{
    return has_16bit_fans(data) ? it87_group_fan16 : it87_group_fan;
}

static struct attribute *it87_attributes_pwm[3][4+1] = { {
    &sensor_dev_attr_pwm1_enable.dev_attr.attr,
    &sensor_dev_attr_pwm1.dev_attr.attr,
    &dev_attr_pwm1_freq.attr,
    &sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr,
    NULL
}, {
    &sensor_dev_attr_pwm2_enable.dev_attr.attr,
    &sensor_dev_attr_pwm2.dev_attr.attr,
    &dev_attr_pwm2_freq.attr,
    &sensor_dev_attr_pwm2_auto_channels_temp.dev_attr.attr,
    NULL
}, {
    &sensor_dev_attr_pwm3_enable.dev_attr.attr,
    &sensor_dev_attr_pwm3.dev_attr.attr,
    &dev_attr_pwm3_freq.attr,
    &sensor_dev_attr_pwm3_auto_channels_temp.dev_attr.attr,
    NULL
} };

static const struct attribute_group it87_group_pwm[3] = {
    { .attrs = it87_attributes_pwm[0] },
    { .attrs = it87_attributes_pwm[1] },
    { .attrs = it87_attributes_pwm[2] },
};

static struct attribute *it87_attributes_autopwm[3][9+1] = { {
    &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,
    NULL
}, {
    &sensor_dev_attr_pwm2_auto_point1_pwm.dev_attr.attr,
    &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,
    NULL
}, {
    &sensor_dev_attr_pwm3_auto_point1_pwm.dev_attr.attr,
    &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,
    NULL
} };

static const struct attribute_group it87_group_autopwm[3] = {
    { .attrs = it87_attributes_autopwm[0] },
    { .attrs = it87_attributes_autopwm[1] },
    { .attrs = it87_attributes_autopwm[2] },
};

static struct attribute *it87_attributes_fan_beep[] = {
    &sensor_dev_attr_fan1_beep.dev_attr.attr,
    &sensor_dev_attr_fan2_beep.dev_attr.attr,
    &sensor_dev_attr_fan3_beep.dev_attr.attr,
    &sensor_dev_attr_fan4_beep.dev_attr.attr,
    &sensor_dev_attr_fan5_beep.dev_attr.attr,
};

static struct attribute *it87_attributes_vid[] = {
    &dev_attr_vrm.attr,
    &dev_attr_cpu0_vid.attr,
    NULL
};

static const struct attribute_group it87_group_vid = {
    .attrs = it87_attributes_vid,
};

static struct attribute *it87_attributes_label[] = {
    &sensor_dev_attr_in3_label.dev_attr.attr,
    &sensor_dev_attr_in7_label.dev_attr.attr,
    &sensor_dev_attr_in8_label.dev_attr.attr,
    NULL
};

static const struct attribute_group it87_group_label = {
    .attrs = it87_attributes_label,
};

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

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

    err = -ENODEV;
    chip_type = force_id ? force_id : superio_inw(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 IT8782F_DEVID:
        sio_data->type = it8782;
        break;
    case IT8783E_DEVID:
        sio_data->type = it8783;
        break;
    case 0xffff:    /* No device at all */
        goto exit;
    default:
        pr_debug("Unsupported chip (DEVID=0x%x)\n", chip_type);
        goto exit;
    }

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

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

    err = 0;
    sio_data->revision = superio_inb(DEVREV) & 0x0f;
    pr_info("Found IT%04xF chip at 0x%x, revision %d\n",
        chip_type, *address, sio_data->revision);

    /* in8 (Vbat) is always internal */
    sio_data->internal = (1 << 2);

    /* Read GPIO config and VID value from LDN 7 (GPIO) */
    if (sio_data->type == it87) {
        /* The IT8705F doesn't have VID pins at all */
        sio_data->skip_vid = 1;

        /* The IT8705F has a different LD number for GPIO */
        superio_select(5);
        sio_data->beep_pin = superio_inb(IT87_SIO_BEEP_PIN_REG) & 0x3f;
    } else if (sio_data->type == it8783) {
        int reg25, reg27, reg2A, reg2C, regEF;

        sio_data->skip_vid = 1; /* No VID */

        superio_select(GPIO);

        reg25 = superio_inb(IT87_SIO_GPIO1_REG);
        reg27 = superio_inb(IT87_SIO_GPIO3_REG);
        reg2A = superio_inb(IT87_SIO_PINX1_REG);
        reg2C = superio_inb(IT87_SIO_PINX2_REG);
        regEF = superio_inb(IT87_SIO_SPI_REG);

        /* Check if fan3 is there or not */
        if ((reg27 & (1 << 0)) || !(reg2C & (1 << 2)))
            sio_data->skip_fan |= (1 << 2);
        if ((reg25 & (1 << 4))
            || (!(reg2A & (1 << 1)) && (regEF & (1 << 0))))
            sio_data->skip_pwm |= (1 << 2);

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

        /* VIN5 */
        if ((reg27 & (1 << 0)) || (reg2C & (1 << 2)))
            sio_data->skip_in |= (1 << 5); /* No VIN5 */

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

        /*
         * VIN7
         * Does not depend on bit 2 of Reg2C, contrary to datasheet.
         */
        if (reg27 & (1 << 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 & (1 << 1))) {
                reg2C |= (1 << 1);
                superio_outb(IT87_SIO_PINX2_REG, reg2C);
                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 & (1 << 0))
            sio_data->internal |= (1 << 0);
        if (reg2C & (1 << 1))
            sio_data->internal |= (1 << 1);

        sio_data->beep_pin = superio_inb(IT87_SIO_BEEP_PIN_REG) & 0x3f;

    } else {
        int reg;
        bool uart6;

        superio_select(GPIO);

        reg = superio_inb(IT87_SIO_GPIO3_REG);
        if (sio_data->type == it8721 || sio_data->type == it8728 ||
            sio_data->type == it8782) {
            /*
             * IT8721F/IT8758E, and IT8782F don't have VID pins
             * at all, not sure about the IT8728F.
             */
            sio_data->skip_vid = 1;
        } else {
            /* 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 & (1 << 6))
            sio_data->skip_pwm |= (1 << 2);
        if (reg & (1 << 7))
            sio_data->skip_fan |= (1 << 2);

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

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

        reg = superio_inb(IT87_SIO_PINX2_REG);

        uart6 = sio_data->type == it8782 && (reg & (1 << 2));

        /*
         * The IT8720F has no VIN7 pin, so VCCH 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 VCCH 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 & (1 << 1))) {
            reg |= (1 << 1);
            superio_outb(IT87_SIO_PINX2_REG, reg);
            pr_notice("Routing internal VCCH to in7\n");
        }
        if (reg & (1 << 0))
            sio_data->internal |= (1 << 0);
        if ((reg & (1 << 1)) || sio_data->type == it8721 ||
            sio_data->type == it8728)
            sio_data->internal |= (1 << 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 |= (1 << 5) | (1 << 6);
            sio_data->skip_temp |= (1 << 2);
        }

        sio_data->beep_pin = superio_inb(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 = (1 << 1);
        }
    }

exit:
    superio_exit();
    return err;
}

static void it87_remove_files(struct device *dev)
{
    struct it87_data *data = platform_get_drvdata(pdev);
    struct it87_sio_data *sio_data = dev->platform_data;
    const struct attribute_group *fan_group = it87_get_fan_group(data);
    int i;

    sysfs_remove_group(&dev->kobj, &it87_group);
    for (i = 0; i < 9; i++) {
        if (sio_data->skip_in & (1 << i))
            continue;
        sysfs_remove_group(&dev->kobj, &it87_group_in[i]);
        if (it87_attributes_in_beep[i])
            sysfs_remove_file(&dev->kobj,
                      it87_attributes_in_beep[i]);
    }
    for (i = 0; i < 3; i++) {
        if (!(data->has_temp & (1 << i)))
            continue;
        sysfs_remove_group(&dev->kobj, &it87_group_temp[i]);
        if (sio_data->beep_pin)
            sysfs_remove_file(&dev->kobj,
                      it87_attributes_temp_beep[i]);
    }
    for (i = 0; i < 5; i++) {
        if (!(data->has_fan & (1 << i)))
            continue;
        sysfs_remove_group(&dev->kobj, &fan_group[i]);
        if (sio_data->beep_pin)
            sysfs_remove_file(&dev->kobj,
                      it87_attributes_fan_beep[i]);
    }
    for (i = 0; i < 3; i++) {
        if (sio_data->skip_pwm & (1 << 0))
            continue;
        sysfs_remove_group(&dev->kobj, &it87_group_pwm[i]);
        if (has_old_autopwm(data))
            sysfs_remove_group(&dev->kobj,
                       &it87_group_autopwm[i]);
    }
    if (!sio_data->skip_vid)
        sysfs_remove_group(&dev->kobj, &it87_group_vid);
    sysfs_remove_group(&dev->kobj, &it87_group_label);
}

static int __devinit it87_probe(struct platform_device *pdev)
{
    struct it87_data *data;
    struct resource *res;
    struct device *dev = &pdev->dev;
    struct it87_sio_data *sio_data = dev->platform_data;
    const struct attribute_group *fan_group;
    int err = 0, i;
    int enable_pwm_interface;
    int fan_beep_need_rw;
    static const char * const names[] = {
        "it87",
        "it8712",
        "it8716",
        "it8718",
        "it8720",
        "it8721",
        "it8728",
        "it8782",
        "it8783",
    };

    res = platform_get_resource(pdev, IORESOURCE_IO, 0);
    if (!devm_request_region(&pdev->dev, res->start, IT87_EC_EXTENT,
                 DRVNAME)) {
        dev_err(dev, "Failed to request region 0x%lx-0x%lx\n",
            (unsigned long)res->start,
            (unsigned long)(res->start + IT87_EC_EXTENT - 1));
        return -EBUSY;
    }

    data = devm_kzalloc(&pdev->dev, sizeof(struct it87_data), GFP_KERNEL);
    if (!data)
        return -ENOMEM;

    data->addr = res->start;
    data->type = sio_data->type;
    data->revision = sio_data->revision;
    data->name = names[sio_data->type];

    /* Now, we do the remaining detection. */
    if ((it87_read_value(data, IT87_REG_CONFIG) & 0x80)
     || it87_read_value(data, IT87_REG_CHIPID) != 0x90)
        return -ENODEV;

    platform_set_drvdata(pdev, data);

    mutex_init(&data->update_lock);

    /* Check PWM configuration */
    enable_pwm_interface = it87_check_pwm(dev);

    /* Starting with IT8721F, we handle scaling of internal voltages */
    if (has_12mv_adc(data)) {
        if (sio_data->internal & (1 << 0))
            data->in_scaled |= (1 << 3);    /* in3 is AVCC */
        if (sio_data->internal & (1 << 1))
            data->in_scaled |= (1 << 7);    /* in7 is VSB */
        if (sio_data->internal & (1 << 2))
            data->in_scaled |= (1 << 8);    /* in8 is Vbat */
    } else if (sio_data->type == it8782 || sio_data->type == it8783) {
        if (sio_data->internal & (1 << 0))
            data->in_scaled |= (1 << 3);    /* in3 is VCC5V */
        if (sio_data->internal & (1 << 1))
            data->in_scaled |= (1 << 7);    /* in7 is VCCH5V */
    }

    data->has_temp = 0x07;
    if (sio_data->skip_temp & (1 << 2)) {
        if (sio_data->type == it8782
            && !(it87_read_value(data, IT87_REG_TEMP_EXTRA) & 0x80))
            data->has_temp &= ~(1 << 2);
    }

    /* Initialize the IT87 chip */
    it87_init_device(pdev);

    /* Register sysfs hooks */
    err = sysfs_create_group(&dev->kobj, &it87_group);
    if (err)
        return err;

    for (i = 0; i < 9; i++) {
        if (sio_data->skip_in & (1 << i))
            continue;
        err = sysfs_create_group(&dev->kobj, &it87_group_in[i]);
        if (err)
            goto error;
        if (sio_data->beep_pin && it87_attributes_in_beep[i]) {
            err = sysfs_create_file(&dev->kobj,
                        it87_attributes_in_beep[i]);
            if (err)
                goto error;
        }
    }

    for (i = 0; i < 3; i++) {
        if (!(data->has_temp & (1 << i)))
            continue;
        err = sysfs_create_group(&dev->kobj, &it87_group_temp[i]);
        if (err)
            goto error;
        if (sio_data->beep_pin) {
            err = sysfs_create_file(&dev->kobj,
                        it87_attributes_temp_beep[i]);
            if (err)
                goto error;
        }
    }

    /* Do not create fan files for disabled fans */
    fan_group = it87_get_fan_group(data);
    fan_beep_need_rw = 1;
    for (i = 0; i < 5; i++) {
        if (!(data->has_fan & (1 << i)))
            continue;
        err = sysfs_create_group(&dev->kobj, &fan_group[i]);
        if (err)
            goto error;

        if (sio_data->beep_pin) {
            err = sysfs_create_file(&dev->kobj,
                        it87_attributes_fan_beep[i]);
            if (err)
                goto error;
            if (!fan_beep_need_rw)
                continue;

            /*
             * As we have a single beep enable bit for all fans,
             * only the first enabled fan has a writable attribute
             * for it.
             */
            if (sysfs_chmod_file(&dev->kobj,
                         it87_attributes_fan_beep[i],
                         S_IRUGO | S_IWUSR))
                dev_dbg(dev, "chmod +w fan%d_beep failed\n",
                    i + 1);
            fan_beep_need_rw = 0;
        }
    }

    if (enable_pwm_interface) {
        for (i = 0; i < 3; i++) {
            if (sio_data->skip_pwm & (1 << i))
                continue;
            err = sysfs_create_group(&dev->kobj,
                         &it87_group_pwm[i]);
            if (err)
                goto error;

            if (!has_old_autopwm(data))
                continue;
            err = sysfs_create_group(&dev->kobj,
                         &it87_group_autopwm[i]);
            if (err)
                goto error;
        }
    }

    if (!sio_data->skip_vid) {
        data->vrm = vid_which_vrm();
        /* VID reading from Super-I/O config space if available */
        data->vid = sio_data->vid_value;
        err = sysfs_create_group(&dev->kobj, &it87_group_vid);
        if (err)
            goto error;
    }

    /* Export labels for internal sensors */
    for (i = 0; i < 3; i++) {
        if (!(sio_data->internal & (1 << i)))
            continue;
        err = sysfs_create_file(&dev->kobj,
                    it87_attributes_label[i]);
        if (err)
            goto error;
    }

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

    return 0;

error:
    it87_remove_files(dev);
    return err;
}

static int __devexit it87_remove(struct platform_device *pdev)
{
    struct it87_data *data = platform_get_drvdata(pdev);

    hwmon_device_unregister(data->hwmon_dev);
    it87_remove_files(&pdev->dev);

    return 0;
}

/*
 * 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);
}

/* Return 1 if and only if the PWM interface is safe to use */
static int __devinit 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) {
            /*
             * The user asks us to attempt a chip reconfiguration.
             * This means switching to active high polarity and
             * inverting all fan speed values.
             */
            int i;
            u8 pwm[3];

            for (i = 0; i < 3; i++)
                pwm[i] = it87_read_value(data,
                             IT87_REG_PWM(i));

            /*
             * If any fan is in automatic pwm mode, the polarity
             * might be correct, as suspicious as it seems, so we
             * better don't change anything (but still disable the
             * PWM interface).
             */
            if (!((pwm[0] | pwm[1] | pwm[2]) & 0x80)) {
                dev_info(dev, "Reconfiguring PWM to "
                     "active high polarity\n");
                it87_write_value(data, IT87_REG_FAN_CTL,
                         tmp | 0x87);
                for (i = 0; i < 3; i++)
                    it87_write_value(data,
                             IT87_REG_PWM(i),
                             0x7f & ~pwm[i]);
                return 1;
            }

            dev_info(dev, "PWM configuration is "
                 "too broken to be fixed\n");
        }

        dev_info(dev, "Detected broken BIOS "
             "defaults, disabling PWM interface\n");
        return 0;
    } else if (fix_pwm_polarity) {
        dev_info(dev, "PWM configuration looks "
             "sane, won't touch\n");
    }

    return 1;
}

/* Called when we have found a new IT87. */
static void __devinit it87_init_device(struct platform_device *pdev)
{
    struct it87_sio_data *sio_data = pdev->dev.platform_data;
    struct it87_data *data = platform_get_drvdata(pdev);
    int tmp, i;
    u8 mask;

    /*
     * 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 < 3; i++) {
        data->pwm_temp_map[i] = i;
        data->pwm_duty[i] = 0x7f;   /* Full speed */
        data->auto_pwm[i][3] = 0x7f;    /* Full speed, hard-coded */
    }

    /*
     * 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.
     */
    for (i = 0; i < 8; i++) {
        tmp = it87_read_value(data, IT87_REG_VIN_MIN(i));
        if (tmp == 0xff)
            it87_write_value(data, IT87_REG_VIN_MIN(i), 0);
    }
    for (i = 0; i < 3; i++) {
        tmp = it87_read_value(data, IT87_REG_TEMP_HIGH(i));
        if (tmp == 0xff)
            it87_write_value(data, IT87_REG_TEMP_HIGH(i), 127);
    }

    /*
     * 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.
     */

    /* Check if voltage monitors are reset manually or by some reason */
    tmp = it87_read_value(data, IT87_REG_VIN_ENABLE);
    if ((tmp & 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 */
    mask = 0x70 & ~(sio_data->skip_fan << 4);
    data->fan_main_ctrl = it87_read_value(data, IT87_REG_FAN_MAIN_CTRL);
    if ((data->fan_main_ctrl & mask) == 0) {
        /* Enable all fan tachometers */
        data->fan_main_ctrl |= mask;
        it87_write_value(data, IT87_REG_FAN_MAIN_CTRL,
                 data->fan_main_ctrl);
    }
    data->has_fan = (data->fan_main_ctrl >> 4) & 0x07;

    /* Set tachometers to 16-bit mode if needed */
    if (has_16bit_fans(data)) {
        tmp = it87_read_value(data, IT87_REG_FAN_16BIT);
        if (~tmp & 0x07 & data->has_fan) {
            dev_dbg(&pdev->dev,
                "Setting fan1-3 to 16-bit mode\n");
            it87_write_value(data, IT87_REG_FAN_16BIT,
                     tmp | 0x07);
        }
        /* IT8705F, IT8782F, and IT8783E/F only support three fans. */
        if (data->type != it87 && data->type != it8782 &&
            data->type != it8783) {
            if (tmp & (1 << 4))
                data->has_fan |= (1 << 3); /* fan4 enabled */
            if (tmp & (1 << 5))
                data->has_fan |= (1 << 4); /* fan5 enabled */
        }
    }

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

    /* Start monitoring */
    it87_write_value(data, IT87_REG_CONFIG,
             (it87_read_value(data, IT87_REG_CONFIG) & 0x3e)
             | (update_vbat ? 0x41 : 0x01));
}

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));
    }
}

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 <= 7; i++) {
            data->in[i] =
                it87_read_value(data, IT87_REG_VIN(i));
            data->in_min[i] =
                it87_read_value(data, IT87_REG_VIN_MIN(i));
            data->in_max[i] =
                it87_read_value(data, IT87_REG_VIN_MAX(i));
        }
        /* in8 (battery) has no limit registers */
        data->in[8] = it87_read_value(data, IT87_REG_VIN(8));

        for (i = 0; i < 5; i++) {
            /* Skip disabled fans */
            if (!(data->has_fan & (1 << i)))
                continue;

            data->fan_min[i] =
                it87_read_value(data, IT87_REG_FAN_MIN[i]);
            data->fan[i] = it87_read_value(data,
                       IT87_REG_FAN[i]);
            /* Add high byte if in 16-bit mode */
            if (has_16bit_fans(data)) {
                data->fan[i] |= it87_read_value(data,
                        IT87_REG_FANX[i]) << 8;
                data->fan_min[i] |= it87_read_value(data,
                        IT87_REG_FANX_MIN[i]) << 8;
            }
        }
        for (i = 0; i < 3; i++) {
            if (!(data->has_temp & (1 << i)))
                continue;
            data->temp[i] =
                it87_read_value(data, IT87_REG_TEMP(i));
            data->temp_high[i] =
                it87_read_value(data, IT87_REG_TEMP_HIGH(i));
            data->temp_low[i] =
                it87_read_value(data, IT87_REG_TEMP_LOW(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 < 3; i++)
            it87_update_pwm_ctrl(data, i);

        data->sensor = it87_read_value(data, IT87_REG_TEMP_ENABLE);
        /*
         * 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 int __init it87_device_add(unsigned short address,
                  const struct it87_sio_data *sio_data)
{
    struct resource res = {
        .start  = address + IT87_EC_OFFSET,
        .end    = address + IT87_EC_OFFSET + IT87_EC_EXTENT - 1,
        .name   = DRVNAME,
        .flags  = IORESOURCE_IO,
    };
    int err;

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

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

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

    err = platform_device_add_data(pdev, sio_data,
                       sizeof(struct it87_sio_data));
    if (err) {
        pr_err("Platform data allocation failed\n");
        goto exit_device_put;
    }

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

    return 0;

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

static int __init sm_it87_init(void)
{
    int err;
    unsigned short isa_address = 0;
    struct it87_sio_data sio_data;

    memset(&sio_data, 0, sizeof(struct it87_sio_data));
    err = it87_find(&isa_address, &sio_data);
    if (err)
        return err;
    err = platform_driver_register(&it87_driver);
    if (err)
        return err;

    err = it87_device_add(isa_address, &sio_data);
    if (err) {
        platform_driver_unregister(&it87_driver);
        return err;
    }

    return 0;
}

static void __exit sm_it87_exit(void)
{
    platform_device_unregister(pdev);
    platform_driver_unregister(&it87_driver);
}


MODULE_AUTHOR("Chris Gauthron, "
          "Jean Delvare <[email protected]>");
MODULE_DESCRIPTION("IT8705F/IT871xF/IT872xF hardware monitoring driver");
module_param(update_vbat, bool, 0);
MODULE_PARM_DESC(update_vbat, "Update vbat if set else return powerup value");
module_param(fix_pwm_polarity, bool, 0);
MODULE_PARM_DESC(fix_pwm_polarity,
         "Force PWM polarity to active high (DANGEROUS)");
MODULE_LICENSE("GPL");

module_init(sm_it87_init);
module_exit(sm_it87_exit);