adt7470.c

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/*
 * A hwmon driver for the Analog Devices ADT7470
 * Copyright (C) 2007 IBM
 *
 * Author: Darrick J. Wong <[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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/log2.h>
#include <linux/kthread.h>
#include <linux/slab.h>

/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x2C, 0x2E, 0x2F, I2C_CLIENT_END };

/* ADT7470 registers */
#define ADT7470_REG_BASE_ADDR           0x20
#define ADT7470_REG_TEMP_BASE_ADDR      0x20
#define ADT7470_REG_TEMP_MAX_ADDR       0x29
#define ADT7470_REG_FAN_BASE_ADDR       0x2A
#define ADT7470_REG_FAN_MAX_ADDR        0x31
#define ADT7470_REG_PWM_BASE_ADDR       0x32
#define ADT7470_REG_PWM_MAX_ADDR        0x35
#define ADT7470_REG_PWM_MAX_BASE_ADDR       0x38
#define ADT7470_REG_PWM_MAX_MAX_ADDR        0x3B
#define ADT7470_REG_CFG             0x40
#define     ADT7470_FSPD_MASK       0x04
#define ADT7470_REG_ALARM1          0x41
#define     ADT7470_R1T_ALARM       0x01
#define     ADT7470_R2T_ALARM       0x02
#define     ADT7470_R3T_ALARM       0x04
#define     ADT7470_R4T_ALARM       0x08
#define     ADT7470_R5T_ALARM       0x10
#define     ADT7470_R6T_ALARM       0x20
#define     ADT7470_R7T_ALARM       0x40
#define     ADT7470_OOL_ALARM       0x80
#define ADT7470_REG_ALARM2          0x42
#define     ADT7470_R8T_ALARM       0x01
#define     ADT7470_R9T_ALARM       0x02
#define     ADT7470_R10T_ALARM      0x04
#define     ADT7470_FAN1_ALARM      0x10
#define     ADT7470_FAN2_ALARM      0x20
#define     ADT7470_FAN3_ALARM      0x40
#define     ADT7470_FAN4_ALARM      0x80
#define ADT7470_REG_TEMP_LIMITS_BASE_ADDR   0x44
#define ADT7470_REG_TEMP_LIMITS_MAX_ADDR    0x57
#define ADT7470_REG_FAN_MIN_BASE_ADDR       0x58
#define ADT7470_REG_FAN_MIN_MAX_ADDR        0x5F
#define ADT7470_REG_FAN_MAX_BASE_ADDR       0x60
#define ADT7470_REG_FAN_MAX_MAX_ADDR        0x67
#define ADT7470_REG_PWM_CFG_BASE_ADDR       0x68
#define ADT7470_REG_PWM12_CFG           0x68
#define     ADT7470_PWM2_AUTO_MASK      0x40
#define     ADT7470_PWM1_AUTO_MASK      0x80
#define     ADT7470_PWM_AUTO_MASK       0xC0
#define ADT7470_REG_PWM34_CFG           0x69
#define     ADT7470_PWM3_AUTO_MASK      0x40
#define     ADT7470_PWM4_AUTO_MASK      0x80
#define ADT7470_REG_PWM_MIN_BASE_ADDR       0x6A
#define ADT7470_REG_PWM_MIN_MAX_ADDR        0x6D
#define ADT7470_REG_PWM_TEMP_MIN_BASE_ADDR  0x6E
#define ADT7470_REG_PWM_TEMP_MIN_MAX_ADDR   0x71
#define ADT7470_REG_ACOUSTICS12         0x75
#define ADT7470_REG_ACOUSTICS34         0x76
#define ADT7470_REG_DEVICE          0x3D
#define ADT7470_REG_VENDOR          0x3E
#define ADT7470_REG_REVISION            0x3F
#define ADT7470_REG_ALARM1_MASK         0x72
#define ADT7470_REG_ALARM2_MASK         0x73
#define ADT7470_REG_PWM_AUTO_TEMP_BASE_ADDR 0x7C
#define ADT7470_REG_PWM_AUTO_TEMP_MAX_ADDR  0x7D
#define ADT7470_REG_MAX_ADDR            0x81

#define ADT7470_TEMP_COUNT  10
#define ADT7470_TEMP_REG(x) (ADT7470_REG_TEMP_BASE_ADDR + (x))
#define ADT7470_TEMP_MIN_REG(x) (ADT7470_REG_TEMP_LIMITS_BASE_ADDR + ((x) * 2))
#define ADT7470_TEMP_MAX_REG(x) (ADT7470_REG_TEMP_LIMITS_BASE_ADDR + \
                ((x) * 2) + 1)

#define ADT7470_FAN_COUNT   4
#define ADT7470_REG_FAN(x)  (ADT7470_REG_FAN_BASE_ADDR + ((x) * 2))
#define ADT7470_REG_FAN_MIN(x)  (ADT7470_REG_FAN_MIN_BASE_ADDR + ((x) * 2))
#define ADT7470_REG_FAN_MAX(x)  (ADT7470_REG_FAN_MAX_BASE_ADDR + ((x) * 2))

#define ADT7470_PWM_COUNT   4
#define ADT7470_REG_PWM(x)  (ADT7470_REG_PWM_BASE_ADDR + (x))
#define ADT7470_REG_PWM_MAX(x)  (ADT7470_REG_PWM_MAX_BASE_ADDR + (x))
#define ADT7470_REG_PWM_MIN(x)  (ADT7470_REG_PWM_MIN_BASE_ADDR + (x))
#define ADT7470_REG_PWM_TMIN(x) (ADT7470_REG_PWM_TEMP_MIN_BASE_ADDR + (x))
#define ADT7470_REG_PWM_CFG(x)  (ADT7470_REG_PWM_CFG_BASE_ADDR + ((x) / 2))
#define ADT7470_REG_PWM_AUTO_TEMP(x)    (ADT7470_REG_PWM_AUTO_TEMP_BASE_ADDR + \
                    ((x) / 2))

#define ALARM2(x)       ((x) << 8)

#define ADT7470_VENDOR      0x41
#define ADT7470_DEVICE      0x70
/* datasheet only mentions a revision 2 */
#define ADT7470_REVISION    0x02

/* "all temps" according to hwmon sysfs interface spec */
#define ADT7470_PWM_ALL_TEMPS   0x3FF

/* How often do we reread sensors values? (In jiffies) */
#define SENSOR_REFRESH_INTERVAL (5 * HZ)

/* How often do we reread sensor limit values? (In jiffies) */
#define LIMIT_REFRESH_INTERVAL  (60 * HZ)

/* Wait at least 200ms per sensor for 10 sensors */
#define TEMP_COLLECTION_TIME    2000

/* auto update thing won't fire more than every 2s */
#define AUTO_UPDATE_INTERVAL    2000

/* datasheet says to divide this number by the fan reading to get fan rpm */
#define FAN_PERIOD_TO_RPM(x)    ((90000 * 60) / (x))
#define FAN_RPM_TO_PERIOD   FAN_PERIOD_TO_RPM
#define FAN_PERIOD_INVALID  65535
#define FAN_DATA_VALID(x)   ((x) && (x) != FAN_PERIOD_INVALID)

struct adt7470_data {
    struct device       *hwmon_dev;
    struct attribute_group  attrs;
    struct mutex        lock;
    char            sensors_valid;
    char            limits_valid;
    unsigned long       sensors_last_updated;   /* In jiffies */
    unsigned long       limits_last_updated;    /* In jiffies */

    int         num_temp_sensors;   /* -1 = probe */
    int         temperatures_probed;

    s8          temp[ADT7470_TEMP_COUNT];
    s8          temp_min[ADT7470_TEMP_COUNT];
    s8          temp_max[ADT7470_TEMP_COUNT];
    u16         fan[ADT7470_FAN_COUNT];
    u16         fan_min[ADT7470_FAN_COUNT];
    u16         fan_max[ADT7470_FAN_COUNT];
    u16         alarm;
    u16         alarms_mask;
    u8          force_pwm_max;
    u8          pwm[ADT7470_PWM_COUNT];
    u8          pwm_max[ADT7470_PWM_COUNT];
    u8          pwm_automatic[ADT7470_PWM_COUNT];
    u8          pwm_min[ADT7470_PWM_COUNT];
    s8          pwm_tmin[ADT7470_PWM_COUNT];
    u8          pwm_auto_temp[ADT7470_PWM_COUNT];

    struct task_struct  *auto_update;
    struct completion   auto_update_stop;
    unsigned int        auto_update_interval;
};

static int adt7470_probe(struct i2c_client *client,
             const struct i2c_device_id *id);
static int adt7470_detect(struct i2c_client *client,
              struct i2c_board_info *info);
static int adt7470_remove(struct i2c_client *client);

static const struct i2c_device_id adt7470_id[] = {
    { "adt7470", 0 },
    { }
};
MODULE_DEVICE_TABLE(i2c, adt7470_id);

static struct i2c_driver adt7470_driver = {
    .class      = I2C_CLASS_HWMON,
    .driver = {
        .name   = "adt7470",
    },
    .probe      = adt7470_probe,
    .remove     = adt7470_remove,
    .id_table   = adt7470_id,
    .detect     = adt7470_detect,
    .address_list   = normal_i2c,
};

/*
 * 16-bit registers on the ADT7470 are low-byte first.  The data sheet says
 * that the low byte must be read before the high byte.
 */
static inline int adt7470_read_word_data(struct i2c_client *client, u8 reg)
{
    u16 foo;
    foo = i2c_smbus_read_byte_data(client, reg);
    foo |= ((u16)i2c_smbus_read_byte_data(client, reg + 1) << 8);
    return foo;
}

static inline int adt7470_write_word_data(struct i2c_client *client, u8 reg,
                      u16 value)
{
    return i2c_smbus_write_byte_data(client, reg, value & 0xFF)
           && i2c_smbus_write_byte_data(client, reg + 1, value >> 8);
}

static void adt7470_init_client(struct i2c_client *client)
{
    int reg = i2c_smbus_read_byte_data(client, ADT7470_REG_CFG);

    if (reg < 0) {
        dev_err(&client->dev, "cannot read configuration register\n");
    } else {
        /* start monitoring (and do a self-test) */
        i2c_smbus_write_byte_data(client, ADT7470_REG_CFG, reg | 3);
    }
}

/* Probe for temperature sensors.  Assumes lock is held */
static int adt7470_read_temperatures(struct i2c_client *client,
                     struct adt7470_data *data)
{
    unsigned long res;
    int i;
    u8 cfg, pwm[4], pwm_cfg[2];

    /* save pwm[1-4] config register */
    pwm_cfg[0] = i2c_smbus_read_byte_data(client, ADT7470_REG_PWM_CFG(0));
    pwm_cfg[1] = i2c_smbus_read_byte_data(client, ADT7470_REG_PWM_CFG(2));

    /* set manual pwm to whatever it is set to now */
    for (i = 0; i < ADT7470_FAN_COUNT; i++)
        pwm[i] = i2c_smbus_read_byte_data(client, ADT7470_REG_PWM(i));

    /* put pwm in manual mode */
    i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_CFG(0),
        pwm_cfg[0] & ~(ADT7470_PWM_AUTO_MASK));
    i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_CFG(2),
        pwm_cfg[1] & ~(ADT7470_PWM_AUTO_MASK));

    /* write pwm control to whatever it was */
    for (i = 0; i < ADT7470_FAN_COUNT; i++)
        i2c_smbus_write_byte_data(client, ADT7470_REG_PWM(i), pwm[i]);

    /* start reading temperature sensors */
    cfg = i2c_smbus_read_byte_data(client, ADT7470_REG_CFG);
    cfg |= 0x80;
    i2c_smbus_write_byte_data(client, ADT7470_REG_CFG, cfg);

    /* Delay is 200ms * number of temp sensors. */
    res = msleep_interruptible((data->num_temp_sensors >= 0 ?
                    data->num_temp_sensors * 200 :
                    TEMP_COLLECTION_TIME));

    /* done reading temperature sensors */
    cfg = i2c_smbus_read_byte_data(client, ADT7470_REG_CFG);
    cfg &= ~0x80;
    i2c_smbus_write_byte_data(client, ADT7470_REG_CFG, cfg);

    /* restore pwm[1-4] config registers */
    i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_CFG(0), pwm_cfg[0]);
    i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_CFG(2), pwm_cfg[1]);

    if (res) {
        pr_err("ha ha, interrupted\n");
        return -EAGAIN;
    }

    /* Only count fans if we have to */
    if (data->num_temp_sensors >= 0)
        return 0;

    for (i = 0; i < ADT7470_TEMP_COUNT; i++) {
        data->temp[i] = i2c_smbus_read_byte_data(client,
                        ADT7470_TEMP_REG(i));
        if (data->temp[i])
            data->num_temp_sensors = i + 1;
    }
    data->temperatures_probed = 1;
    return 0;
}

static int adt7470_update_thread(void *p)
{
    struct i2c_client *client = p;
    struct adt7470_data *data = i2c_get_clientdata(client);

    while (!kthread_should_stop()) {
        mutex_lock(&data->lock);
        adt7470_read_temperatures(client, data);
        mutex_unlock(&data->lock);
        if (kthread_should_stop())
            break;
        msleep_interruptible(data->auto_update_interval);
    }

    complete_all(&data->auto_update_stop);
    return 0;
}

static struct adt7470_data *adt7470_update_device(struct device *dev)
{
    struct i2c_client *client = to_i2c_client(dev);
    struct adt7470_data *data = i2c_get_clientdata(client);
    unsigned long local_jiffies = jiffies;
    u8 cfg;
    int i;
    int need_sensors = 1;
    int need_limits = 1;

    /*
     * Figure out if we need to update the shadow registers.
     * Lockless means that we may occasionally report out of
     * date data.
     */
    if (time_before(local_jiffies, data->sensors_last_updated +
            SENSOR_REFRESH_INTERVAL) &&
        data->sensors_valid)
        need_sensors = 0;

    if (time_before(local_jiffies, data->limits_last_updated +
            LIMIT_REFRESH_INTERVAL) &&
        data->limits_valid)
        need_limits = 0;

    if (!need_sensors && !need_limits)
        return data;

    mutex_lock(&data->lock);
    if (!need_sensors)
        goto no_sensor_update;

    if (!data->temperatures_probed)
        adt7470_read_temperatures(client, data);
    else
        for (i = 0; i < ADT7470_TEMP_COUNT; i++)
            data->temp[i] = i2c_smbus_read_byte_data(client,
                        ADT7470_TEMP_REG(i));

    for (i = 0; i < ADT7470_FAN_COUNT; i++)
        data->fan[i] = adt7470_read_word_data(client,
                        ADT7470_REG_FAN(i));

    for (i = 0; i < ADT7470_PWM_COUNT; i++) {
        int reg;
        int reg_mask;

        data->pwm[i] = i2c_smbus_read_byte_data(client,
                        ADT7470_REG_PWM(i));

        if (i % 2)
            reg_mask = ADT7470_PWM2_AUTO_MASK;
        else
            reg_mask = ADT7470_PWM1_AUTO_MASK;

        reg = ADT7470_REG_PWM_CFG(i);
        if (i2c_smbus_read_byte_data(client, reg) & reg_mask)
            data->pwm_automatic[i] = 1;
        else
            data->pwm_automatic[i] = 0;

        reg = ADT7470_REG_PWM_AUTO_TEMP(i);
        cfg = i2c_smbus_read_byte_data(client, reg);
        if (!(i % 2))
            data->pwm_auto_temp[i] = cfg >> 4;
        else
            data->pwm_auto_temp[i] = cfg & 0xF;
    }

    if (i2c_smbus_read_byte_data(client, ADT7470_REG_CFG) &
        ADT7470_FSPD_MASK)
        data->force_pwm_max = 1;
    else
        data->force_pwm_max = 0;

    data->alarm = i2c_smbus_read_byte_data(client, ADT7470_REG_ALARM1);
    if (data->alarm & ADT7470_OOL_ALARM)
        data->alarm |= ALARM2(i2c_smbus_read_byte_data(client,
                            ADT7470_REG_ALARM2));
    data->alarms_mask = adt7470_read_word_data(client,
                           ADT7470_REG_ALARM1_MASK);

    data->sensors_last_updated = local_jiffies;
    data->sensors_valid = 1;

no_sensor_update:
    if (!need_limits)
        goto out;

    for (i = 0; i < ADT7470_TEMP_COUNT; i++) {
        data->temp_min[i] = i2c_smbus_read_byte_data(client,
                        ADT7470_TEMP_MIN_REG(i));
        data->temp_max[i] = i2c_smbus_read_byte_data(client,
                        ADT7470_TEMP_MAX_REG(i));
    }

    for (i = 0; i < ADT7470_FAN_COUNT; i++) {
        data->fan_min[i] = adt7470_read_word_data(client,
                        ADT7470_REG_FAN_MIN(i));
        data->fan_max[i] = adt7470_read_word_data(client,
                        ADT7470_REG_FAN_MAX(i));
    }

    for (i = 0; i < ADT7470_PWM_COUNT; i++) {
        data->pwm_max[i] = i2c_smbus_read_byte_data(client,
                        ADT7470_REG_PWM_MAX(i));
        data->pwm_min[i] = i2c_smbus_read_byte_data(client,
                        ADT7470_REG_PWM_MIN(i));
        data->pwm_tmin[i] = i2c_smbus_read_byte_data(client,
                        ADT7470_REG_PWM_TMIN(i));
    }

    data->limits_last_updated = local_jiffies;
    data->limits_valid = 1;

out:
    mutex_unlock(&data->lock);
    return data;
}

static ssize_t show_auto_update_interval(struct device *dev,
                     struct device_attribute *devattr,
                     char *buf)
{
    struct adt7470_data *data = adt7470_update_device(dev);
    return sprintf(buf, "%d\n", data->auto_update_interval);
}

static ssize_t set_auto_update_interval(struct device *dev,
                    struct device_attribute *devattr,
                    const char *buf,
                    size_t count)
{
    struct i2c_client *client = to_i2c_client(dev);
    struct adt7470_data *data = i2c_get_clientdata(client);
    long temp;

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

    temp = SENSORS_LIMIT(temp, 0, 60000);

    mutex_lock(&data->lock);
    data->auto_update_interval = temp;
    mutex_unlock(&data->lock);

    return count;
}

static ssize_t show_num_temp_sensors(struct device *dev,
                     struct device_attribute *devattr,
                     char *buf)
{
    struct adt7470_data *data = adt7470_update_device(dev);
    return sprintf(buf, "%d\n", data->num_temp_sensors);
}

static ssize_t set_num_temp_sensors(struct device *dev,
                    struct device_attribute *devattr,
                    const char *buf,
                    size_t count)
{
    struct i2c_client *client = to_i2c_client(dev);
    struct adt7470_data *data = i2c_get_clientdata(client);
    long temp;

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

    temp = SENSORS_LIMIT(temp, -1, 10);

    mutex_lock(&data->lock);
    data->num_temp_sensors = temp;
    if (temp < 0)
        data->temperatures_probed = 0;
    mutex_unlock(&data->lock);

    return count;
}

static ssize_t show_temp_min(struct device *dev,
                 struct device_attribute *devattr,
                 char *buf)
{
    struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    struct adt7470_data *data = adt7470_update_device(dev);
    return sprintf(buf, "%d\n", 1000 * data->temp_min[attr->index]);
}

static ssize_t set_temp_min(struct device *dev,
                struct device_attribute *devattr,
                const char *buf,
                size_t count)
{
    struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    struct i2c_client *client = to_i2c_client(dev);
    struct adt7470_data *data = i2c_get_clientdata(client);
    long temp;

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

    temp = DIV_ROUND_CLOSEST(temp, 1000);
    temp = SENSORS_LIMIT(temp, 0, 255);

    mutex_lock(&data->lock);
    data->temp_min[attr->index] = temp;
    i2c_smbus_write_byte_data(client, ADT7470_TEMP_MIN_REG(attr->index),
                  temp);
    mutex_unlock(&data->lock);

    return count;
}

static ssize_t show_temp_max(struct device *dev,
                 struct device_attribute *devattr,
                 char *buf)
{
    struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    struct adt7470_data *data = adt7470_update_device(dev);
    return sprintf(buf, "%d\n", 1000 * data->temp_max[attr->index]);
}

static ssize_t set_temp_max(struct device *dev,
                struct device_attribute *devattr,
                const char *buf,
                size_t count)
{
    struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    struct i2c_client *client = to_i2c_client(dev);
    struct adt7470_data *data = i2c_get_clientdata(client);
    long temp;

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

    temp = DIV_ROUND_CLOSEST(temp, 1000);
    temp = SENSORS_LIMIT(temp, 0, 255);

    mutex_lock(&data->lock);
    data->temp_max[attr->index] = temp;
    i2c_smbus_write_byte_data(client, ADT7470_TEMP_MAX_REG(attr->index),
                  temp);
    mutex_unlock(&data->lock);

    return count;
}

static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
             char *buf)
{
    struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    struct adt7470_data *data = adt7470_update_device(dev);
    return sprintf(buf, "%d\n", 1000 * data->temp[attr->index]);
}

static ssize_t show_alarm_mask(struct device *dev,
               struct device_attribute *devattr,
               char *buf)
{
    struct adt7470_data *data = adt7470_update_device(dev);

    return sprintf(buf, "%x\n", data->alarms_mask);
}

static ssize_t show_fan_max(struct device *dev,
                struct device_attribute *devattr,
                char *buf)
{
    struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    struct adt7470_data *data = adt7470_update_device(dev);

    if (FAN_DATA_VALID(data->fan_max[attr->index]))
        return sprintf(buf, "%d\n",
                   FAN_PERIOD_TO_RPM(data->fan_max[attr->index]));
    else
        return sprintf(buf, "0\n");
}

static ssize_t set_fan_max(struct device *dev,
               struct device_attribute *devattr,
               const char *buf, size_t count)
{
    struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    struct i2c_client *client = to_i2c_client(dev);
    struct adt7470_data *data = i2c_get_clientdata(client);
    long temp;

    if (kstrtol(buf, 10, &temp) || !temp)
        return -EINVAL;

    temp = FAN_RPM_TO_PERIOD(temp);
    temp = SENSORS_LIMIT(temp, 1, 65534);

    mutex_lock(&data->lock);
    data->fan_max[attr->index] = temp;
    adt7470_write_word_data(client, ADT7470_REG_FAN_MAX(attr->index), temp);
    mutex_unlock(&data->lock);

    return count;
}

static ssize_t show_fan_min(struct device *dev,
                struct device_attribute *devattr,
                char *buf)
{
    struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    struct adt7470_data *data = adt7470_update_device(dev);

    if (FAN_DATA_VALID(data->fan_min[attr->index]))
        return sprintf(buf, "%d\n",
                   FAN_PERIOD_TO_RPM(data->fan_min[attr->index]));
    else
        return sprintf(buf, "0\n");
}

static ssize_t set_fan_min(struct device *dev,
               struct device_attribute *devattr,
               const char *buf, size_t count)
{
    struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    struct i2c_client *client = to_i2c_client(dev);
    struct adt7470_data *data = i2c_get_clientdata(client);
    long temp;

    if (kstrtol(buf, 10, &temp) || !temp)
        return -EINVAL;

    temp = FAN_RPM_TO_PERIOD(temp);
    temp = SENSORS_LIMIT(temp, 1, 65534);

    mutex_lock(&data->lock);
    data->fan_min[attr->index] = temp;
    adt7470_write_word_data(client, ADT7470_REG_FAN_MIN(attr->index), temp);
    mutex_unlock(&data->lock);

    return count;
}

static ssize_t show_fan(struct device *dev, struct device_attribute *devattr,
            char *buf)
{
    struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    struct adt7470_data *data = adt7470_update_device(dev);

    if (FAN_DATA_VALID(data->fan[attr->index]))
        return sprintf(buf, "%d\n",
                   FAN_PERIOD_TO_RPM(data->fan[attr->index]));
    else
        return sprintf(buf, "0\n");
}

static ssize_t show_force_pwm_max(struct device *dev,
                  struct device_attribute *devattr,
                  char *buf)
{
    struct adt7470_data *data = adt7470_update_device(dev);
    return sprintf(buf, "%d\n", data->force_pwm_max);
}

static ssize_t set_force_pwm_max(struct device *dev,
                 struct device_attribute *devattr,
                 const char *buf,
                 size_t count)
{
    struct i2c_client *client = to_i2c_client(dev);
    struct adt7470_data *data = i2c_get_clientdata(client);
    long temp;
    u8 reg;

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

    mutex_lock(&data->lock);
    data->force_pwm_max = temp;
    reg = i2c_smbus_read_byte_data(client, ADT7470_REG_CFG);
    if (temp)
        reg |= ADT7470_FSPD_MASK;
    else
        reg &= ~ADT7470_FSPD_MASK;
    i2c_smbus_write_byte_data(client, ADT7470_REG_CFG, reg);
    mutex_unlock(&data->lock);

    return count;
}

static ssize_t show_pwm(struct device *dev, struct device_attribute *devattr,
            char *buf)
{
    struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    struct adt7470_data *data = adt7470_update_device(dev);
    return sprintf(buf, "%d\n", data->pwm[attr->index]);
}

static ssize_t set_pwm(struct device *dev, struct device_attribute *devattr,
            const char *buf, size_t count)
{
    struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    struct i2c_client *client = to_i2c_client(dev);
    struct adt7470_data *data = i2c_get_clientdata(client);
    long temp;

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

    temp = SENSORS_LIMIT(temp, 0, 255);

    mutex_lock(&data->lock);
    data->pwm[attr->index] = temp;
    i2c_smbus_write_byte_data(client, ADT7470_REG_PWM(attr->index), temp);
    mutex_unlock(&data->lock);

    return count;
}

static ssize_t show_pwm_max(struct device *dev,
                struct device_attribute *devattr,
                char *buf)
{
    struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    struct adt7470_data *data = adt7470_update_device(dev);
    return sprintf(buf, "%d\n", data->pwm_max[attr->index]);
}

static ssize_t set_pwm_max(struct device *dev,
               struct device_attribute *devattr,
               const char *buf,
               size_t count)
{
    struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    struct i2c_client *client = to_i2c_client(dev);
    struct adt7470_data *data = i2c_get_clientdata(client);
    long temp;

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

    temp = SENSORS_LIMIT(temp, 0, 255);

    mutex_lock(&data->lock);
    data->pwm_max[attr->index] = temp;
    i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_MAX(attr->index),
                  temp);
    mutex_unlock(&data->lock);

    return count;
}

static ssize_t show_pwm_min(struct device *dev,
                struct device_attribute *devattr,
                char *buf)
{
    struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    struct adt7470_data *data = adt7470_update_device(dev);
    return sprintf(buf, "%d\n", data->pwm_min[attr->index]);
}

static ssize_t set_pwm_min(struct device *dev,
               struct device_attribute *devattr,
               const char *buf,
               size_t count)
{
    struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    struct i2c_client *client = to_i2c_client(dev);
    struct adt7470_data *data = i2c_get_clientdata(client);
    long temp;

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

    temp = SENSORS_LIMIT(temp, 0, 255);

    mutex_lock(&data->lock);
    data->pwm_min[attr->index] = temp;
    i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_MIN(attr->index),
                  temp);
    mutex_unlock(&data->lock);

    return count;
}

static ssize_t show_pwm_tmax(struct device *dev,
                 struct device_attribute *devattr,
                 char *buf)
{
    struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    struct adt7470_data *data = adt7470_update_device(dev);
    /* the datasheet says that tmax = tmin + 20C */
    return sprintf(buf, "%d\n", 1000 * (20 + data->pwm_tmin[attr->index]));
}

static ssize_t show_pwm_tmin(struct device *dev,
                 struct device_attribute *devattr,
                 char *buf)
{
    struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    struct adt7470_data *data = adt7470_update_device(dev);
    return sprintf(buf, "%d\n", 1000 * data->pwm_tmin[attr->index]);
}

static ssize_t set_pwm_tmin(struct device *dev,
                struct device_attribute *devattr,
                const char *buf,
                size_t count)
{
    struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    struct i2c_client *client = to_i2c_client(dev);
    struct adt7470_data *data = i2c_get_clientdata(client);
    long temp;

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

    temp = DIV_ROUND_CLOSEST(temp, 1000);
    temp = SENSORS_LIMIT(temp, 0, 255);

    mutex_lock(&data->lock);
    data->pwm_tmin[attr->index] = temp;
    i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_TMIN(attr->index),
                  temp);
    mutex_unlock(&data->lock);

    return count;
}

static ssize_t show_pwm_auto(struct device *dev,
                 struct device_attribute *devattr,
                 char *buf)
{
    struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    struct adt7470_data *data = adt7470_update_device(dev);
    return sprintf(buf, "%d\n", 1 + data->pwm_automatic[attr->index]);
}

static ssize_t set_pwm_auto(struct device *dev,
                struct device_attribute *devattr,
                const char *buf,
                size_t count)
{
    struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    struct i2c_client *client = to_i2c_client(dev);
    struct adt7470_data *data = i2c_get_clientdata(client);
    int pwm_auto_reg = ADT7470_REG_PWM_CFG(attr->index);
    int pwm_auto_reg_mask;
    long temp;
    u8 reg;

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

    if (attr->index % 2)
        pwm_auto_reg_mask = ADT7470_PWM2_AUTO_MASK;
    else
        pwm_auto_reg_mask = ADT7470_PWM1_AUTO_MASK;

    if (temp != 2 && temp != 1)
        return -EINVAL;
    temp--;

    mutex_lock(&data->lock);
    data->pwm_automatic[attr->index] = temp;
    reg = i2c_smbus_read_byte_data(client, pwm_auto_reg);
    if (temp)
        reg |= pwm_auto_reg_mask;
    else
        reg &= ~pwm_auto_reg_mask;
    i2c_smbus_write_byte_data(client, pwm_auto_reg, reg);
    mutex_unlock(&data->lock);

    return count;
}

static ssize_t show_pwm_auto_temp(struct device *dev,
                  struct device_attribute *devattr,
                  char *buf)
{
    struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    struct adt7470_data *data = adt7470_update_device(dev);
    u8 ctrl = data->pwm_auto_temp[attr->index];

    if (ctrl)
        return sprintf(buf, "%d\n", 1 << (ctrl - 1));
    else
        return sprintf(buf, "%d\n", ADT7470_PWM_ALL_TEMPS);
}

static int cvt_auto_temp(int input)
{
    if (input == ADT7470_PWM_ALL_TEMPS)
        return 0;
    if (input < 1 || !is_power_of_2(input))
        return -EINVAL;
    return ilog2(input) + 1;
}

static ssize_t set_pwm_auto_temp(struct device *dev,
                 struct device_attribute *devattr,
                 const char *buf,
                 size_t count)
{
    struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    struct i2c_client *client = to_i2c_client(dev);
    struct adt7470_data *data = i2c_get_clientdata(client);
    int pwm_auto_reg = ADT7470_REG_PWM_AUTO_TEMP(attr->index);
    long temp;
    u8 reg;

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

    temp = cvt_auto_temp(temp);
    if (temp < 0)
        return temp;

    mutex_lock(&data->lock);
    data->pwm_automatic[attr->index] = temp;
    reg = i2c_smbus_read_byte_data(client, pwm_auto_reg);

    if (!(attr->index % 2)) {
        reg &= 0xF;
        reg |= (temp << 4) & 0xF0;
    } else {
        reg &= 0xF0;
        reg |= temp & 0xF;
    }

    i2c_smbus_write_byte_data(client, pwm_auto_reg, reg);
    mutex_unlock(&data->lock);

    return count;
}

static ssize_t show_alarm(struct device *dev,
              struct device_attribute *devattr,
              char *buf)
{
    struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
    struct adt7470_data *data = adt7470_update_device(dev);

    if (data->alarm & attr->index)
        return sprintf(buf, "1\n");
    else
        return sprintf(buf, "0\n");
}

static DEVICE_ATTR(alarm_mask, S_IRUGO, show_alarm_mask, NULL);
static DEVICE_ATTR(num_temp_sensors, S_IWUSR | S_IRUGO, show_num_temp_sensors,
           set_num_temp_sensors);
static DEVICE_ATTR(auto_update_interval, S_IWUSR | S_IRUGO,
           show_auto_update_interval, set_auto_update_interval);

static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max,
            set_temp_max, 0);
static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_max,
            set_temp_max, 1);
static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_temp_max,
            set_temp_max, 2);
static SENSOR_DEVICE_ATTR(temp4_max, S_IWUSR | S_IRUGO, show_temp_max,
            set_temp_max, 3);
static SENSOR_DEVICE_ATTR(temp5_max, S_IWUSR | S_IRUGO, show_temp_max,
            set_temp_max, 4);
static SENSOR_DEVICE_ATTR(temp6_max, S_IWUSR | S_IRUGO, show_temp_max,
            set_temp_max, 5);
static SENSOR_DEVICE_ATTR(temp7_max, S_IWUSR | S_IRUGO, show_temp_max,
            set_temp_max, 6);
static SENSOR_DEVICE_ATTR(temp8_max, S_IWUSR | S_IRUGO, show_temp_max,
            set_temp_max, 7);
static SENSOR_DEVICE_ATTR(temp9_max, S_IWUSR | S_IRUGO, show_temp_max,
            set_temp_max, 8);
static SENSOR_DEVICE_ATTR(temp10_max, S_IWUSR | S_IRUGO, show_temp_max,
            set_temp_max, 9);

static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_min,
            set_temp_min, 0);
static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_min,
            set_temp_min, 1);
static SENSOR_DEVICE_ATTR(temp3_min, S_IWUSR | S_IRUGO, show_temp_min,
            set_temp_min, 2);
static SENSOR_DEVICE_ATTR(temp4_min, S_IWUSR | S_IRUGO, show_temp_min,
            set_temp_min, 3);
static SENSOR_DEVICE_ATTR(temp5_min, S_IWUSR | S_IRUGO, show_temp_min,
            set_temp_min, 4);
static SENSOR_DEVICE_ATTR(temp6_min, S_IWUSR | S_IRUGO, show_temp_min,
            set_temp_min, 5);
static SENSOR_DEVICE_ATTR(temp7_min, S_IWUSR | S_IRUGO, show_temp_min,
            set_temp_min, 6);
static SENSOR_DEVICE_ATTR(temp8_min, S_IWUSR | S_IRUGO, show_temp_min,
            set_temp_min, 7);
static SENSOR_DEVICE_ATTR(temp9_min, S_IWUSR | S_IRUGO, show_temp_min,
            set_temp_min, 8);
static SENSOR_DEVICE_ATTR(temp10_min, S_IWUSR | S_IRUGO, show_temp_min,
            set_temp_min, 9);

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp, NULL, 4);
static SENSOR_DEVICE_ATTR(temp6_input, S_IRUGO, show_temp, NULL, 5);
static SENSOR_DEVICE_ATTR(temp7_input, S_IRUGO, show_temp, NULL, 6);
static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, show_temp, NULL, 7);
static SENSOR_DEVICE_ATTR(temp9_input, S_IRUGO, show_temp, NULL, 8);
static SENSOR_DEVICE_ATTR(temp10_input, S_IRUGO, show_temp, NULL, 9);

static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL,
              ADT7470_R1T_ALARM);
static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL,
              ADT7470_R2T_ALARM);
static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL,
              ADT7470_R3T_ALARM);
static SENSOR_DEVICE_ATTR(temp4_alarm, S_IRUGO, show_alarm, NULL,
              ADT7470_R4T_ALARM);
static SENSOR_DEVICE_ATTR(temp5_alarm, S_IRUGO, show_alarm, NULL,
              ADT7470_R5T_ALARM);
static SENSOR_DEVICE_ATTR(temp6_alarm, S_IRUGO, show_alarm, NULL,
              ADT7470_R6T_ALARM);
static SENSOR_DEVICE_ATTR(temp7_alarm, S_IRUGO, show_alarm, NULL,
              ADT7470_R7T_ALARM);
static SENSOR_DEVICE_ATTR(temp8_alarm, S_IRUGO, show_alarm, NULL,
              ALARM2(ADT7470_R8T_ALARM));
static SENSOR_DEVICE_ATTR(temp9_alarm, S_IRUGO, show_alarm, NULL,
              ALARM2(ADT7470_R9T_ALARM));
static SENSOR_DEVICE_ATTR(temp10_alarm, S_IRUGO, show_alarm, NULL,
              ALARM2(ADT7470_R10T_ALARM));

static SENSOR_DEVICE_ATTR(fan1_max, S_IWUSR | S_IRUGO, show_fan_max,
            set_fan_max, 0);
static SENSOR_DEVICE_ATTR(fan2_max, S_IWUSR | S_IRUGO, show_fan_max,
            set_fan_max, 1);
static SENSOR_DEVICE_ATTR(fan3_max, S_IWUSR | S_IRUGO, show_fan_max,
            set_fan_max, 2);
static SENSOR_DEVICE_ATTR(fan4_max, S_IWUSR | S_IRUGO, show_fan_max,
            set_fan_max, 3);

static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan_min,
            set_fan_min, 0);
static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR | S_IRUGO, show_fan_min,
            set_fan_min, 1);
static SENSOR_DEVICE_ATTR(fan3_min, S_IWUSR | S_IRUGO, show_fan_min,
            set_fan_min, 2);
static SENSOR_DEVICE_ATTR(fan4_min, S_IWUSR | S_IRUGO, show_fan_min,
            set_fan_min, 3);

static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2);
static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3);

static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL,
              ALARM2(ADT7470_FAN1_ALARM));
static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL,
              ALARM2(ADT7470_FAN2_ALARM));
static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL,
              ALARM2(ADT7470_FAN3_ALARM));
static SENSOR_DEVICE_ATTR(fan4_alarm, S_IRUGO, show_alarm, NULL,
              ALARM2(ADT7470_FAN4_ALARM));

static SENSOR_DEVICE_ATTR(force_pwm_max, S_IWUSR | S_IRUGO,
            show_force_pwm_max, set_force_pwm_max, 0);

static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 0);
static SENSOR_DEVICE_ATTR(pwm2, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 1);
static SENSOR_DEVICE_ATTR(pwm3, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 2);
static SENSOR_DEVICE_ATTR(pwm4, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 3);

static SENSOR_DEVICE_ATTR(pwm1_auto_point1_pwm, S_IWUSR | S_IRUGO,
            show_pwm_min, set_pwm_min, 0);
static SENSOR_DEVICE_ATTR(pwm2_auto_point1_pwm, S_IWUSR | S_IRUGO,
            show_pwm_min, set_pwm_min, 1);
static SENSOR_DEVICE_ATTR(pwm3_auto_point1_pwm, S_IWUSR | S_IRUGO,
            show_pwm_min, set_pwm_min, 2);
static SENSOR_DEVICE_ATTR(pwm4_auto_point1_pwm, S_IWUSR | S_IRUGO,
            show_pwm_min, set_pwm_min, 3);

static SENSOR_DEVICE_ATTR(pwm1_auto_point2_pwm, S_IWUSR | S_IRUGO,
            show_pwm_max, set_pwm_max, 0);
static SENSOR_DEVICE_ATTR(pwm2_auto_point2_pwm, S_IWUSR | S_IRUGO,
            show_pwm_max, set_pwm_max, 1);
static SENSOR_DEVICE_ATTR(pwm3_auto_point2_pwm, S_IWUSR | S_IRUGO,
            show_pwm_max, set_pwm_max, 2);
static SENSOR_DEVICE_ATTR(pwm4_auto_point2_pwm, S_IWUSR | S_IRUGO,
            show_pwm_max, set_pwm_max, 3);

static SENSOR_DEVICE_ATTR(pwm1_auto_point1_temp, S_IWUSR | S_IRUGO,
            show_pwm_tmin, set_pwm_tmin, 0);
static SENSOR_DEVICE_ATTR(pwm2_auto_point1_temp, S_IWUSR | S_IRUGO,
            show_pwm_tmin, set_pwm_tmin, 1);
static SENSOR_DEVICE_ATTR(pwm3_auto_point1_temp, S_IWUSR | S_IRUGO,
            show_pwm_tmin, set_pwm_tmin, 2);
static SENSOR_DEVICE_ATTR(pwm4_auto_point1_temp, S_IWUSR | S_IRUGO,
            show_pwm_tmin, set_pwm_tmin, 3);

static SENSOR_DEVICE_ATTR(pwm1_auto_point2_temp, S_IRUGO, show_pwm_tmax,
            NULL, 0);
static SENSOR_DEVICE_ATTR(pwm2_auto_point2_temp, S_IRUGO, show_pwm_tmax,
            NULL, 1);
static SENSOR_DEVICE_ATTR(pwm3_auto_point2_temp, S_IRUGO, show_pwm_tmax,
            NULL, 2);
static SENSOR_DEVICE_ATTR(pwm4_auto_point2_temp, S_IRUGO, show_pwm_tmax,
            NULL, 3);

static SENSOR_DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, show_pwm_auto,
            set_pwm_auto, 0);
static SENSOR_DEVICE_ATTR(pwm2_enable, S_IWUSR | S_IRUGO, show_pwm_auto,
            set_pwm_auto, 1);
static SENSOR_DEVICE_ATTR(pwm3_enable, S_IWUSR | S_IRUGO, show_pwm_auto,
            set_pwm_auto, 2);
static SENSOR_DEVICE_ATTR(pwm4_enable, S_IWUSR | S_IRUGO, show_pwm_auto,
            set_pwm_auto, 3);

static SENSOR_DEVICE_ATTR(pwm1_auto_channels_temp, S_IWUSR | S_IRUGO,
            show_pwm_auto_temp, set_pwm_auto_temp, 0);
static SENSOR_DEVICE_ATTR(pwm2_auto_channels_temp, S_IWUSR | S_IRUGO,
            show_pwm_auto_temp, set_pwm_auto_temp, 1);
static SENSOR_DEVICE_ATTR(pwm3_auto_channels_temp, S_IWUSR | S_IRUGO,
            show_pwm_auto_temp, set_pwm_auto_temp, 2);
static SENSOR_DEVICE_ATTR(pwm4_auto_channels_temp, S_IWUSR | S_IRUGO,
            show_pwm_auto_temp, set_pwm_auto_temp, 3);

static struct attribute *adt7470_attr[] = {
    &dev_attr_alarm_mask.attr,
    &dev_attr_num_temp_sensors.attr,
    &dev_attr_auto_update_interval.attr,
    &sensor_dev_attr_temp1_max.dev_attr.attr,
    &sensor_dev_attr_temp2_max.dev_attr.attr,
    &sensor_dev_attr_temp3_max.dev_attr.attr,
    &sensor_dev_attr_temp4_max.dev_attr.attr,
    &sensor_dev_attr_temp5_max.dev_attr.attr,
    &sensor_dev_attr_temp6_max.dev_attr.attr,
    &sensor_dev_attr_temp7_max.dev_attr.attr,
    &sensor_dev_attr_temp8_max.dev_attr.attr,
    &sensor_dev_attr_temp9_max.dev_attr.attr,
    &sensor_dev_attr_temp10_max.dev_attr.attr,
    &sensor_dev_attr_temp1_min.dev_attr.attr,
    &sensor_dev_attr_temp2_min.dev_attr.attr,
    &sensor_dev_attr_temp3_min.dev_attr.attr,
    &sensor_dev_attr_temp4_min.dev_attr.attr,
    &sensor_dev_attr_temp5_min.dev_attr.attr,
    &sensor_dev_attr_temp6_min.dev_attr.attr,
    &sensor_dev_attr_temp7_min.dev_attr.attr,
    &sensor_dev_attr_temp8_min.dev_attr.attr,
    &sensor_dev_attr_temp9_min.dev_attr.attr,
    &sensor_dev_attr_temp10_min.dev_attr.attr,
    &sensor_dev_attr_temp1_input.dev_attr.attr,
    &sensor_dev_attr_temp2_input.dev_attr.attr,
    &sensor_dev_attr_temp3_input.dev_attr.attr,
    &sensor_dev_attr_temp4_input.dev_attr.attr,
    &sensor_dev_attr_temp5_input.dev_attr.attr,
    &sensor_dev_attr_temp6_input.dev_attr.attr,
    &sensor_dev_attr_temp7_input.dev_attr.attr,
    &sensor_dev_attr_temp8_input.dev_attr.attr,
    &sensor_dev_attr_temp9_input.dev_attr.attr,
    &sensor_dev_attr_temp10_input.dev_attr.attr,
    &sensor_dev_attr_temp1_alarm.dev_attr.attr,
    &sensor_dev_attr_temp2_alarm.dev_attr.attr,
    &sensor_dev_attr_temp3_alarm.dev_attr.attr,
    &sensor_dev_attr_temp4_alarm.dev_attr.attr,
    &sensor_dev_attr_temp5_alarm.dev_attr.attr,
    &sensor_dev_attr_temp6_alarm.dev_attr.attr,
    &sensor_dev_attr_temp7_alarm.dev_attr.attr,
    &sensor_dev_attr_temp8_alarm.dev_attr.attr,
    &sensor_dev_attr_temp9_alarm.dev_attr.attr,
    &sensor_dev_attr_temp10_alarm.dev_attr.attr,
    &sensor_dev_attr_fan1_max.dev_attr.attr,
    &sensor_dev_attr_fan2_max.dev_attr.attr,
    &sensor_dev_attr_fan3_max.dev_attr.attr,
    &sensor_dev_attr_fan4_max.dev_attr.attr,
    &sensor_dev_attr_fan1_min.dev_attr.attr,
    &sensor_dev_attr_fan2_min.dev_attr.attr,
    &sensor_dev_attr_fan3_min.dev_attr.attr,
    &sensor_dev_attr_fan4_min.dev_attr.attr,
    &sensor_dev_attr_fan1_input.dev_attr.attr,
    &sensor_dev_attr_fan2_input.dev_attr.attr,
    &sensor_dev_attr_fan3_input.dev_attr.attr,
    &sensor_dev_attr_fan4_input.dev_attr.attr,
    &sensor_dev_attr_fan1_alarm.dev_attr.attr,
    &sensor_dev_attr_fan2_alarm.dev_attr.attr,
    &sensor_dev_attr_fan3_alarm.dev_attr.attr,
    &sensor_dev_attr_fan4_alarm.dev_attr.attr,
    &sensor_dev_attr_force_pwm_max.dev_attr.attr,
    &sensor_dev_attr_pwm1.dev_attr.attr,
    &sensor_dev_attr_pwm2.dev_attr.attr,
    &sensor_dev_attr_pwm3.dev_attr.attr,
    &sensor_dev_attr_pwm4.dev_attr.attr,
    &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
    &sensor_dev_attr_pwm2_auto_point1_pwm.dev_attr.attr,
    &sensor_dev_attr_pwm3_auto_point1_pwm.dev_attr.attr,
    &sensor_dev_attr_pwm4_auto_point1_pwm.dev_attr.attr,
    &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
    &sensor_dev_attr_pwm2_auto_point2_pwm.dev_attr.attr,
    &sensor_dev_attr_pwm3_auto_point2_pwm.dev_attr.attr,
    &sensor_dev_attr_pwm4_auto_point2_pwm.dev_attr.attr,
    &sensor_dev_attr_pwm1_auto_point1_temp.dev_attr.attr,
    &sensor_dev_attr_pwm2_auto_point1_temp.dev_attr.attr,
    &sensor_dev_attr_pwm3_auto_point1_temp.dev_attr.attr,
    &sensor_dev_attr_pwm4_auto_point1_temp.dev_attr.attr,
    &sensor_dev_attr_pwm1_auto_point2_temp.dev_attr.attr,
    &sensor_dev_attr_pwm2_auto_point2_temp.dev_attr.attr,
    &sensor_dev_attr_pwm3_auto_point2_temp.dev_attr.attr,
    &sensor_dev_attr_pwm4_auto_point2_temp.dev_attr.attr,
    &sensor_dev_attr_pwm1_enable.dev_attr.attr,
    &sensor_dev_attr_pwm2_enable.dev_attr.attr,
    &sensor_dev_attr_pwm3_enable.dev_attr.attr,
    &sensor_dev_attr_pwm4_enable.dev_attr.attr,
    &sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr,
    &sensor_dev_attr_pwm2_auto_channels_temp.dev_attr.attr,
    &sensor_dev_attr_pwm3_auto_channels_temp.dev_attr.attr,
    &sensor_dev_attr_pwm4_auto_channels_temp.dev_attr.attr,
    NULL
};

/* Return 0 if detection is successful, -ENODEV otherwise */
static int adt7470_detect(struct i2c_client *client,
              struct i2c_board_info *info)
{
    struct i2c_adapter *adapter = client->adapter;
    int vendor, device, revision;

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

    vendor = i2c_smbus_read_byte_data(client, ADT7470_REG_VENDOR);
    if (vendor != ADT7470_VENDOR)
        return -ENODEV;

    device = i2c_smbus_read_byte_data(client, ADT7470_REG_DEVICE);
    if (device != ADT7470_DEVICE)
        return -ENODEV;

    revision = i2c_smbus_read_byte_data(client, ADT7470_REG_REVISION);
    if (revision != ADT7470_REVISION)
        return -ENODEV;

    strlcpy(info->type, "adt7470", I2C_NAME_SIZE);

    return 0;
}

static int adt7470_probe(struct i2c_client *client,
             const struct i2c_device_id *id)
{
    struct adt7470_data *data;
    int err;

    data = devm_kzalloc(&client->dev, sizeof(struct adt7470_data),
                GFP_KERNEL);
    if (!data)
        return -ENOMEM;

    data->num_temp_sensors = -1;
    data->auto_update_interval = AUTO_UPDATE_INTERVAL;

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

    dev_info(&client->dev, "%s chip found\n", client->name);

    /* Initialize the ADT7470 chip */
    adt7470_init_client(client);

    /* Register sysfs hooks */
    data->attrs.attrs = adt7470_attr;
    err = sysfs_create_group(&client->dev.kobj, &data->attrs);
    if (err)
        return err;

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

    init_completion(&data->auto_update_stop);
    data->auto_update = kthread_run(adt7470_update_thread, client,
                    dev_name(data->hwmon_dev));
    if (IS_ERR(data->auto_update)) {
        err = PTR_ERR(data->auto_update);
        goto exit_unregister;
    }

    return 0;

exit_unregister:
    hwmon_device_unregister(data->hwmon_dev);
exit_remove:
    sysfs_remove_group(&client->dev.kobj, &data->attrs);
    return err;
}

static int adt7470_remove(struct i2c_client *client)
{
    struct adt7470_data *data = i2c_get_clientdata(client);

    kthread_stop(data->auto_update);
    wait_for_completion(&data->auto_update_stop);
    hwmon_device_unregister(data->hwmon_dev);
    sysfs_remove_group(&client->dev.kobj, &data->attrs);
    return 0;
}

module_i2c_driver(adt7470_driver);

MODULE_AUTHOR("Darrick J. Wong <[email protected]>");
MODULE_DESCRIPTION("ADT7470 driver");
MODULE_LICENSE("GPL");