adm1026.c

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/*
 * adm1026.c - Part of lm_sensors, Linux kernel modules for hardware
 *         monitoring
 * Copyright (C) 2002, 2003  Philip Pokorny <[email protected]>
 * Copyright (C) 2004 Justin Thiessen <[email protected]>
 *
 * Chip details at:
 *
 * <http://www.onsemi.com/PowerSolutions/product.do?id=ADM1026>
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/hwmon-vid.h>
#include <linux/err.h>
#include <linux/mutex.h>

/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };

static int gpio_input[17] = { -1, -1, -1, -1, -1, -1, -1, -1, -1,
                -1, -1, -1, -1, -1, -1, -1, -1 };
static int gpio_output[17] = { -1, -1, -1, -1, -1, -1, -1, -1, -1,
                -1, -1, -1, -1, -1, -1, -1, -1 };
static int gpio_inverted[17] = { -1, -1, -1, -1, -1, -1, -1, -1, -1,
                -1, -1, -1, -1, -1, -1, -1, -1 };
static int gpio_normal[17] = { -1, -1, -1, -1, -1, -1, -1, -1, -1,
                -1, -1, -1, -1, -1, -1, -1, -1 };
static int gpio_fan[8] = { -1, -1, -1, -1, -1, -1, -1, -1 };
module_param_array(gpio_input, int, NULL, 0);
MODULE_PARM_DESC(gpio_input, "List of GPIO pins (0-16) to program as inputs");
module_param_array(gpio_output, int, NULL, 0);
MODULE_PARM_DESC(gpio_output, "List of GPIO pins (0-16) to program as "
    "outputs");
module_param_array(gpio_inverted, int, NULL, 0);
MODULE_PARM_DESC(gpio_inverted, "List of GPIO pins (0-16) to program as "
    "inverted");
module_param_array(gpio_normal, int, NULL, 0);
MODULE_PARM_DESC(gpio_normal, "List of GPIO pins (0-16) to program as "
    "normal/non-inverted");
module_param_array(gpio_fan, int, NULL, 0);
MODULE_PARM_DESC(gpio_fan, "List of GPIO pins (0-7) to program as fan tachs");

/* Many ADM1026 constants specified below */

/* The ADM1026 registers */
#define ADM1026_REG_CONFIG1 0x00
#define CFG1_MONITOR        0x01
#define CFG1_INT_ENABLE     0x02
#define CFG1_INT_CLEAR      0x04
#define CFG1_AIN8_9     0x08
#define CFG1_THERM_HOT      0x10
#define CFG1_DAC_AFC        0x20
#define CFG1_PWM_AFC        0x40
#define CFG1_RESET      0x80

#define ADM1026_REG_CONFIG2 0x01
/* CONFIG2 controls FAN0/GPIO0 through FAN7/GPIO7 */

#define ADM1026_REG_CONFIG3 0x07
#define CFG3_GPIO16_ENABLE  0x01
#define CFG3_CI_CLEAR       0x02
#define CFG3_VREF_250       0x04
#define CFG3_GPIO16_DIR     0x40
#define CFG3_GPIO16_POL     0x80

#define ADM1026_REG_E2CONFIG    0x13
#define E2CFG_READ      0x01
#define E2CFG_WRITE     0x02
#define E2CFG_ERASE     0x04
#define E2CFG_ROM       0x08
#define E2CFG_CLK_EXT       0x80

/*
 * There are 10 general analog inputs and 7 dedicated inputs
 * They are:
 *    0 - 9  =  AIN0 - AIN9
 *       10  =  Vbat
 *       11  =  3.3V Standby
 *       12  =  3.3V Main
 *       13  =  +5V
 *       14  =  Vccp (CPU core voltage)
 *       15  =  +12V
 *       16  =  -12V
 */
static u16 ADM1026_REG_IN[] = {
        0x30, 0x31, 0x32, 0x33, 0x34, 0x35,
        0x36, 0x37, 0x27, 0x29, 0x26, 0x2a,
        0x2b, 0x2c, 0x2d, 0x2e, 0x2f
    };
static u16 ADM1026_REG_IN_MIN[] = {
        0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d,
        0x5e, 0x5f, 0x6d, 0x49, 0x6b, 0x4a,
        0x4b, 0x4c, 0x4d, 0x4e, 0x4f
    };
static u16 ADM1026_REG_IN_MAX[] = {
        0x50, 0x51, 0x52, 0x53, 0x54, 0x55,
        0x56, 0x57, 0x6c, 0x41, 0x6a, 0x42,
        0x43, 0x44, 0x45, 0x46, 0x47
    };

/*
 * Temperatures are:
 *    0 - Internal
 *    1 - External 1
 *    2 - External 2
 */
static u16 ADM1026_REG_TEMP[] = { 0x1f, 0x28, 0x29 };
static u16 ADM1026_REG_TEMP_MIN[] = { 0x69, 0x48, 0x49 };
static u16 ADM1026_REG_TEMP_MAX[] = { 0x68, 0x40, 0x41 };
static u16 ADM1026_REG_TEMP_TMIN[] = { 0x10, 0x11, 0x12 };
static u16 ADM1026_REG_TEMP_THERM[] = { 0x0d, 0x0e, 0x0f };
static u16 ADM1026_REG_TEMP_OFFSET[] = { 0x1e, 0x6e, 0x6f };

#define ADM1026_REG_FAN(nr)     (0x38 + (nr))
#define ADM1026_REG_FAN_MIN(nr)     (0x60 + (nr))
#define ADM1026_REG_FAN_DIV_0_3     0x02
#define ADM1026_REG_FAN_DIV_4_7     0x03

#define ADM1026_REG_DAC         0x04
#define ADM1026_REG_PWM         0x05

#define ADM1026_REG_GPIO_CFG_0_3    0x08
#define ADM1026_REG_GPIO_CFG_4_7    0x09
#define ADM1026_REG_GPIO_CFG_8_11   0x0a
#define ADM1026_REG_GPIO_CFG_12_15  0x0b
/* CFG_16 in REG_CFG3 */
#define ADM1026_REG_GPIO_STATUS_0_7 0x24
#define ADM1026_REG_GPIO_STATUS_8_15    0x25
/* STATUS_16 in REG_STATUS4 */
#define ADM1026_REG_GPIO_MASK_0_7   0x1c
#define ADM1026_REG_GPIO_MASK_8_15  0x1d
/* MASK_16 in REG_MASK4 */

#define ADM1026_REG_COMPANY     0x16
#define ADM1026_REG_VERSTEP     0x17
/* These are the recognized values for the above regs */
#define ADM1026_COMPANY_ANALOG_DEV  0x41
#define ADM1026_VERSTEP_GENERIC     0x40
#define ADM1026_VERSTEP_ADM1026     0x44

#define ADM1026_REG_MASK1       0x18
#define ADM1026_REG_MASK2       0x19
#define ADM1026_REG_MASK3       0x1a
#define ADM1026_REG_MASK4       0x1b

#define ADM1026_REG_STATUS1     0x20
#define ADM1026_REG_STATUS2     0x21
#define ADM1026_REG_STATUS3     0x22
#define ADM1026_REG_STATUS4     0x23

#define ADM1026_FAN_ACTIVATION_TEMP_HYST -6
#define ADM1026_FAN_CONTROL_TEMP_RANGE  20
#define ADM1026_PWM_MAX         255

/*
 * Conversions. Rounding and limit checking is only done on the TO_REG
 * variants. Note that you should be a bit careful with which arguments
 * these macros are called: arguments may be evaluated more than once.
 */

/*
 * IN are scaled according to built-in resistors.  These are the
 *   voltages corresponding to 3/4 of full scale (192 or 0xc0)
 *   NOTE: The -12V input needs an additional factor to account
 *      for the Vref pullup resistor.
 *      NEG12_OFFSET = SCALE * Vref / V-192 - Vref
 *                   = 13875 * 2.50 / 1.875 - 2500
 *                   = 16000
 *
 * The values in this table are based on Table II, page 15 of the
 *    datasheet.
 */
static int adm1026_scaling[] = { /* .001 Volts */
        2250, 2250, 2250, 2250, 2250, 2250,
        1875, 1875, 1875, 1875, 3000, 3330,
        3330, 4995, 2250, 12000, 13875
    };
#define NEG12_OFFSET  16000
#define SCALE(val, from, to) (((val)*(to) + ((from)/2))/(from))
#define INS_TO_REG(n, val)  (SENSORS_LIMIT(SCALE(val, adm1026_scaling[n], 192),\
    0, 255))
#define INS_FROM_REG(n, val) (SCALE(val, 192, adm1026_scaling[n]))

/*
 * FAN speed is measured using 22.5kHz clock and counts for 2 pulses
 *   and we assume a 2 pulse-per-rev fan tach signal
 *      22500 kHz * 60 (sec/min) * 2 (pulse) / 2 (pulse/rev) == 1350000
 */
#define FAN_TO_REG(val, div)  ((val) <= 0 ? 0xff : \
                SENSORS_LIMIT(1350000 / ((val) * (div)), \
                          1, 254))
#define FAN_FROM_REG(val, div) ((val) == 0 ? -1 : (val) == 0xff ? 0 : \
                1350000 / ((val) * (div)))
#define DIV_FROM_REG(val) (1 << (val))
#define DIV_TO_REG(val) ((val) >= 8 ? 3 : (val) >= 4 ? 2 : (val) >= 2 ? 1 : 0)

/* Temperature is reported in 1 degC increments */
#define TEMP_TO_REG(val) (SENSORS_LIMIT(((val) + ((val) < 0 ? -500 : 500)) \
                    / 1000, -127, 127))
#define TEMP_FROM_REG(val) ((val) * 1000)
#define OFFSET_TO_REG(val) (SENSORS_LIMIT(((val) + ((val) < 0 ? -500 : 500)) \
                      / 1000, -127, 127))
#define OFFSET_FROM_REG(val) ((val) * 1000)

#define PWM_TO_REG(val) (SENSORS_LIMIT(val, 0, 255))
#define PWM_FROM_REG(val) (val)

#define PWM_MIN_TO_REG(val) ((val) & 0xf0)
#define PWM_MIN_FROM_REG(val) (((val) & 0xf0) + ((val) >> 4))

/*
 * Analog output is a voltage, and scaled to millivolts.  The datasheet
 *   indicates that the DAC could be used to drive the fans, but in our
 *   example board (Arima HDAMA) it isn't connected to the fans at all.
 */
#define DAC_TO_REG(val) (SENSORS_LIMIT(((((val) * 255) + 500) / 2500), 0, 255))
#define DAC_FROM_REG(val) (((val) * 2500) / 255)

/*
 * Chip sampling rates
 *
 * Some sensors are not updated more frequently than once per second
 *    so it doesn't make sense to read them more often than that.
 *    We cache the results and return the saved data if the driver
 *    is called again before a second has elapsed.
 *
 * Also, there is significant configuration data for this chip
 *    So, we keep the config data up to date in the cache
 *    when it is written and only sample it once every 5 *minutes*
 */
#define ADM1026_DATA_INTERVAL       (1 * HZ)
#define ADM1026_CONFIG_INTERVAL     (5 * 60 * HZ)

/*
 * We allow for multiple chips in a single system.
 *
 * For each registered ADM1026, we need to keep state information
 * at client->data. The adm1026_data structure is dynamically
 * allocated, when a new client structure is allocated.
 */

struct pwm_data {
    u8 pwm;
    u8 enable;
    u8 auto_pwm_min;
};

struct adm1026_data {
    struct device *hwmon_dev;

    struct mutex update_lock;
    int valid;      /* !=0 if following fields are valid */
    unsigned long last_reading; /* In jiffies */
    unsigned long last_config;  /* In jiffies */

    u8 in[17];      /* Register value */
    u8 in_max[17];      /* Register value */
    u8 in_min[17];      /* Register value */
    s8 temp[3];     /* Register value */
    s8 temp_min[3];     /* Register value */
    s8 temp_max[3];     /* Register value */
    s8 temp_tmin[3];    /* Register value */
    s8 temp_crit[3];    /* Register value */
    s8 temp_offset[3];  /* Register value */
    u8 fan[8];      /* Register value */
    u8 fan_min[8];      /* Register value */
    u8 fan_div[8];      /* Decoded value */
    struct pwm_data pwm1;   /* Pwm control values */
    u8 vrm;         /* VRM version */
    u8 analog_out;      /* Register value (DAC) */
    long alarms;        /* Register encoding, combined */
    long alarm_mask;    /* Register encoding, combined */
    long gpio;      /* Register encoding, combined */
    long gpio_mask;     /* Register encoding, combined */
    u8 gpio_config[17]; /* Decoded value */
    u8 config1;     /* Register value */
    u8 config2;     /* Register value */
    u8 config3;     /* Register value */
};

static int adm1026_probe(struct i2c_client *client,
             const struct i2c_device_id *id);
static int adm1026_detect(struct i2c_client *client,
              struct i2c_board_info *info);
static int adm1026_remove(struct i2c_client *client);
static int adm1026_read_value(struct i2c_client *client, u8 reg);
static int adm1026_write_value(struct i2c_client *client, u8 reg, int value);
static void adm1026_print_gpio(struct i2c_client *client);
static void adm1026_fixup_gpio(struct i2c_client *client);
static struct adm1026_data *adm1026_update_device(struct device *dev);
static void adm1026_init_client(struct i2c_client *client);


static const struct i2c_device_id adm1026_id[] = {
    { "adm1026", 0 },
    { }
};
MODULE_DEVICE_TABLE(i2c, adm1026_id);

static struct i2c_driver adm1026_driver = {
    .class      = I2C_CLASS_HWMON,
    .driver = {
        .name   = "adm1026",
    },
    .probe      = adm1026_probe,
    .remove     = adm1026_remove,
    .id_table   = adm1026_id,
    .detect     = adm1026_detect,
    .address_list   = normal_i2c,
};

static int adm1026_read_value(struct i2c_client *client, u8 reg)
{
    int res;

    if (reg < 0x80) {
        /* "RAM" locations */
        res = i2c_smbus_read_byte_data(client, reg) & 0xff;
    } else {
        /* EEPROM, do nothing */
        res = 0;
    }
    return res;
}

static int adm1026_write_value(struct i2c_client *client, u8 reg, int value)
{
    int res;

    if (reg < 0x80) {
        /* "RAM" locations */
        res = i2c_smbus_write_byte_data(client, reg, value);
    } else {
        /* EEPROM, do nothing */
        res = 0;
    }
    return res;
}

static void adm1026_init_client(struct i2c_client *client)
{
    int value, i;
    struct adm1026_data *data = i2c_get_clientdata(client);

    dev_dbg(&client->dev, "Initializing device\n");
    /* Read chip config */
    data->config1 = adm1026_read_value(client, ADM1026_REG_CONFIG1);
    data->config2 = adm1026_read_value(client, ADM1026_REG_CONFIG2);
    data->config3 = adm1026_read_value(client, ADM1026_REG_CONFIG3);

    /* Inform user of chip config */
    dev_dbg(&client->dev, "ADM1026_REG_CONFIG1 is: 0x%02x\n",
        data->config1);
    if ((data->config1 & CFG1_MONITOR) == 0) {
        dev_dbg(&client->dev, "Monitoring not currently "
            "enabled.\n");
    }
    if (data->config1 & CFG1_INT_ENABLE) {
        dev_dbg(&client->dev, "SMBALERT interrupts are "
            "enabled.\n");
    }
    if (data->config1 & CFG1_AIN8_9) {
        dev_dbg(&client->dev, "in8 and in9 enabled. "
            "temp3 disabled.\n");
    } else {
        dev_dbg(&client->dev, "temp3 enabled.  in8 and "
            "in9 disabled.\n");
    }
    if (data->config1 & CFG1_THERM_HOT) {
        dev_dbg(&client->dev, "Automatic THERM, PWM, "
            "and temp limits enabled.\n");
    }

    if (data->config3 & CFG3_GPIO16_ENABLE) {
        dev_dbg(&client->dev, "GPIO16 enabled.  THERM "
            "pin disabled.\n");
    } else {
        dev_dbg(&client->dev, "THERM pin enabled.  "
            "GPIO16 disabled.\n");
    }
    if (data->config3 & CFG3_VREF_250)
        dev_dbg(&client->dev, "Vref is 2.50 Volts.\n");
    else
        dev_dbg(&client->dev, "Vref is 1.82 Volts.\n");
    /* Read and pick apart the existing GPIO configuration */
    value = 0;
    for (i = 0; i <= 15; ++i) {
        if ((i & 0x03) == 0) {
            value = adm1026_read_value(client,
                    ADM1026_REG_GPIO_CFG_0_3 + i / 4);
        }
        data->gpio_config[i] = value & 0x03;
        value >>= 2;
    }
    data->gpio_config[16] = (data->config3 >> 6) & 0x03;

    /* ... and then print it */
    adm1026_print_gpio(client);

    /*
     * If the user asks us to reprogram the GPIO config, then
     * do it now.
     */
    if (gpio_input[0] != -1 || gpio_output[0] != -1
        || gpio_inverted[0] != -1 || gpio_normal[0] != -1
        || gpio_fan[0] != -1) {
        adm1026_fixup_gpio(client);
    }

    /*
     * WE INTENTIONALLY make no changes to the limits,
     *   offsets, pwms, fans and zones.  If they were
     *   configured, we don't want to mess with them.
     *   If they weren't, the default is 100% PWM, no
     *   control and will suffice until 'sensors -s'
     *   can be run by the user.  We DO set the default
     *   value for pwm1.auto_pwm_min to its maximum
     *   so that enabling automatic pwm fan control
     *   without first setting a value for pwm1.auto_pwm_min
     *   will not result in potentially dangerous fan speed decrease.
     */
    data->pwm1.auto_pwm_min = 255;
    /* Start monitoring */
    value = adm1026_read_value(client, ADM1026_REG_CONFIG1);
    /* Set MONITOR, clear interrupt acknowledge and s/w reset */
    value = (value | CFG1_MONITOR) & (~CFG1_INT_CLEAR & ~CFG1_RESET);
    dev_dbg(&client->dev, "Setting CONFIG to: 0x%02x\n", value);
    data->config1 = value;
    adm1026_write_value(client, ADM1026_REG_CONFIG1, value);

    /* initialize fan_div[] to hardware defaults */
    value = adm1026_read_value(client, ADM1026_REG_FAN_DIV_0_3) |
        (adm1026_read_value(client, ADM1026_REG_FAN_DIV_4_7) << 8);
    for (i = 0; i <= 7; ++i) {
        data->fan_div[i] = DIV_FROM_REG(value & 0x03);
        value >>= 2;
    }
}

static void adm1026_print_gpio(struct i2c_client *client)
{
    struct adm1026_data *data = i2c_get_clientdata(client);
    int i;

    dev_dbg(&client->dev, "GPIO config is:\n");
    for (i = 0; i <= 7; ++i) {
        if (data->config2 & (1 << i)) {
            dev_dbg(&client->dev, "\t%sGP%s%d\n",
                data->gpio_config[i] & 0x02 ? "" : "!",
                data->gpio_config[i] & 0x01 ? "OUT" : "IN",
                i);
        } else {
            dev_dbg(&client->dev, "\tFAN%d\n", i);
        }
    }
    for (i = 8; i <= 15; ++i) {
        dev_dbg(&client->dev, "\t%sGP%s%d\n",
            data->gpio_config[i] & 0x02 ? "" : "!",
            data->gpio_config[i] & 0x01 ? "OUT" : "IN",
            i);
    }
    if (data->config3 & CFG3_GPIO16_ENABLE) {
        dev_dbg(&client->dev, "\t%sGP%s16\n",
            data->gpio_config[16] & 0x02 ? "" : "!",
            data->gpio_config[16] & 0x01 ? "OUT" : "IN");
    } else {
        /* GPIO16 is THERM */
        dev_dbg(&client->dev, "\tTHERM\n");
    }
}

static void adm1026_fixup_gpio(struct i2c_client *client)
{
    struct adm1026_data *data = i2c_get_clientdata(client);
    int i;
    int value;

    /* Make the changes requested. */
    /*
     * We may need to unlock/stop monitoring or soft-reset the
     *    chip before we can make changes.  This hasn't been
     *    tested much.  FIXME
     */

    /* Make outputs */
    for (i = 0; i <= 16; ++i) {
        if (gpio_output[i] >= 0 && gpio_output[i] <= 16)
            data->gpio_config[gpio_output[i]] |= 0x01;
        /* if GPIO0-7 is output, it isn't a FAN tach */
        if (gpio_output[i] >= 0 && gpio_output[i] <= 7)
            data->config2 |= 1 << gpio_output[i];
    }

    /* Input overrides output */
    for (i = 0; i <= 16; ++i) {
        if (gpio_input[i] >= 0 && gpio_input[i] <= 16)
            data->gpio_config[gpio_input[i]] &= ~0x01;
        /* if GPIO0-7 is input, it isn't a FAN tach */
        if (gpio_input[i] >= 0 && gpio_input[i] <= 7)
            data->config2 |= 1 << gpio_input[i];
    }

    /* Inverted */
    for (i = 0; i <= 16; ++i) {
        if (gpio_inverted[i] >= 0 && gpio_inverted[i] <= 16)
            data->gpio_config[gpio_inverted[i]] &= ~0x02;
    }

    /* Normal overrides inverted */
    for (i = 0; i <= 16; ++i) {
        if (gpio_normal[i] >= 0 && gpio_normal[i] <= 16)
            data->gpio_config[gpio_normal[i]] |= 0x02;
    }

    /* Fan overrides input and output */
    for (i = 0; i <= 7; ++i) {
        if (gpio_fan[i] >= 0 && gpio_fan[i] <= 7)
            data->config2 &= ~(1 << gpio_fan[i]);
    }

    /* Write new configs to registers */
    adm1026_write_value(client, ADM1026_REG_CONFIG2, data->config2);
    data->config3 = (data->config3 & 0x3f)
            | ((data->gpio_config[16] & 0x03) << 6);
    adm1026_write_value(client, ADM1026_REG_CONFIG3, data->config3);
    for (i = 15, value = 0; i >= 0; --i) {
        value <<= 2;
        value |= data->gpio_config[i] & 0x03;
        if ((i & 0x03) == 0) {
            adm1026_write_value(client,
                    ADM1026_REG_GPIO_CFG_0_3 + i/4,
                    value);
            value = 0;
        }
    }

    /* Print the new config */
    adm1026_print_gpio(client);
}


static struct adm1026_data *adm1026_update_device(struct device *dev)
{
    struct i2c_client *client = to_i2c_client(dev);
    struct adm1026_data *data = i2c_get_clientdata(client);
    int i;
    long value, alarms, gpio;

    mutex_lock(&data->update_lock);
    if (!data->valid
        || time_after(jiffies,
              data->last_reading + ADM1026_DATA_INTERVAL)) {
        /* Things that change quickly */
        dev_dbg(&client->dev, "Reading sensor values\n");
        for (i = 0; i <= 16; ++i) {
            data->in[i] =
                adm1026_read_value(client, ADM1026_REG_IN[i]);
        }

        for (i = 0; i <= 7; ++i) {
            data->fan[i] =
                adm1026_read_value(client, ADM1026_REG_FAN(i));
        }

        for (i = 0; i <= 2; ++i) {
            /*
             * NOTE: temp[] is s8 and we assume 2's complement
             *   "conversion" in the assignment
             */
            data->temp[i] =
                adm1026_read_value(client, ADM1026_REG_TEMP[i]);
        }

        data->pwm1.pwm = adm1026_read_value(client,
            ADM1026_REG_PWM);
        data->analog_out = adm1026_read_value(client,
            ADM1026_REG_DAC);
        /* GPIO16 is MSbit of alarms, move it to gpio */
        alarms = adm1026_read_value(client, ADM1026_REG_STATUS4);
        gpio = alarms & 0x80 ? 0x0100 : 0; /* GPIO16 */
        alarms &= 0x7f;
        alarms <<= 8;
        alarms |= adm1026_read_value(client, ADM1026_REG_STATUS3);
        alarms <<= 8;
        alarms |= adm1026_read_value(client, ADM1026_REG_STATUS2);
        alarms <<= 8;
        alarms |= adm1026_read_value(client, ADM1026_REG_STATUS1);
        data->alarms = alarms;

        /* Read the GPIO values */
        gpio |= adm1026_read_value(client,
            ADM1026_REG_GPIO_STATUS_8_15);
        gpio <<= 8;
        gpio |= adm1026_read_value(client,
            ADM1026_REG_GPIO_STATUS_0_7);
        data->gpio = gpio;

        data->last_reading = jiffies;
    }; /* last_reading */

    if (!data->valid ||
        time_after(jiffies, data->last_config + ADM1026_CONFIG_INTERVAL)) {
        /* Things that don't change often */
        dev_dbg(&client->dev, "Reading config values\n");
        for (i = 0; i <= 16; ++i) {
            data->in_min[i] = adm1026_read_value(client,
                ADM1026_REG_IN_MIN[i]);
            data->in_max[i] = adm1026_read_value(client,
                ADM1026_REG_IN_MAX[i]);
        }

        value = adm1026_read_value(client, ADM1026_REG_FAN_DIV_0_3)
            | (adm1026_read_value(client, ADM1026_REG_FAN_DIV_4_7)
            << 8);
        for (i = 0; i <= 7; ++i) {
            data->fan_min[i] = adm1026_read_value(client,
                ADM1026_REG_FAN_MIN(i));
            data->fan_div[i] = DIV_FROM_REG(value & 0x03);
            value >>= 2;
        }

        for (i = 0; i <= 2; ++i) {
            /*
             * NOTE: temp_xxx[] are s8 and we assume 2's
             *    complement "conversion" in the assignment
             */
            data->temp_min[i] = adm1026_read_value(client,
                ADM1026_REG_TEMP_MIN[i]);
            data->temp_max[i] = adm1026_read_value(client,
                ADM1026_REG_TEMP_MAX[i]);
            data->temp_tmin[i] = adm1026_read_value(client,
                ADM1026_REG_TEMP_TMIN[i]);
            data->temp_crit[i] = adm1026_read_value(client,
                ADM1026_REG_TEMP_THERM[i]);
            data->temp_offset[i] = adm1026_read_value(client,
                ADM1026_REG_TEMP_OFFSET[i]);
        }

        /* Read the STATUS/alarm masks */
        alarms = adm1026_read_value(client, ADM1026_REG_MASK4);
        gpio = alarms & 0x80 ? 0x0100 : 0; /* GPIO16 */
        alarms = (alarms & 0x7f) << 8;
        alarms |= adm1026_read_value(client, ADM1026_REG_MASK3);
        alarms <<= 8;
        alarms |= adm1026_read_value(client, ADM1026_REG_MASK2);
        alarms <<= 8;
        alarms |= adm1026_read_value(client, ADM1026_REG_MASK1);
        data->alarm_mask = alarms;

        /* Read the GPIO values */
        gpio |= adm1026_read_value(client,
            ADM1026_REG_GPIO_MASK_8_15);
        gpio <<= 8;
        gpio |= adm1026_read_value(client, ADM1026_REG_GPIO_MASK_0_7);
        data->gpio_mask = gpio;

        /* Read various values from CONFIG1 */
        data->config1 = adm1026_read_value(client,
            ADM1026_REG_CONFIG1);
        if (data->config1 & CFG1_PWM_AFC) {
            data->pwm1.enable = 2;
            data->pwm1.auto_pwm_min =
                PWM_MIN_FROM_REG(data->pwm1.pwm);
        }
        /* Read the GPIO config */
        data->config2 = adm1026_read_value(client,
            ADM1026_REG_CONFIG2);
        data->config3 = adm1026_read_value(client,
            ADM1026_REG_CONFIG3);
        data->gpio_config[16] = (data->config3 >> 6) & 0x03;

        value = 0;
        for (i = 0; i <= 15; ++i) {
            if ((i & 0x03) == 0) {
                value = adm1026_read_value(client,
                        ADM1026_REG_GPIO_CFG_0_3 + i/4);
            }
            data->gpio_config[i] = value & 0x03;
            value >>= 2;
        }

        data->last_config = jiffies;
    }; /* last_config */

    data->valid = 1;
    mutex_unlock(&data->update_lock);
    return data;
}

static ssize_t show_in(struct device *dev, struct device_attribute *attr,
        char *buf)
{
    struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
    int nr = sensor_attr->index;
    struct adm1026_data *data = adm1026_update_device(dev);
    return sprintf(buf, "%d\n", INS_FROM_REG(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 adm1026_data *data = adm1026_update_device(dev);
    return sprintf(buf, "%d\n", INS_FROM_REG(nr, data->in_min[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 i2c_client *client = to_i2c_client(dev);
    struct adm1026_data *data = i2c_get_clientdata(client);
    long val;
    int err;

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

    mutex_lock(&data->update_lock);
    data->in_min[nr] = INS_TO_REG(nr, val);
    adm1026_write_value(client, ADM1026_REG_IN_MIN[nr], data->in_min[nr]);
    mutex_unlock(&data->update_lock);
    return count;
}
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 adm1026_data *data = adm1026_update_device(dev);
    return sprintf(buf, "%d\n", INS_FROM_REG(nr, data->in_max[nr]));
}
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 i2c_client *client = to_i2c_client(dev);
    struct adm1026_data *data = i2c_get_clientdata(client);
    long val;
    int err;

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

    mutex_lock(&data->update_lock);
    data->in_max[nr] = INS_TO_REG(nr, val);
    adm1026_write_value(client, ADM1026_REG_IN_MAX[nr], data->in_max[nr]);
    mutex_unlock(&data->update_lock);
    return count;
}

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


in_reg(0);
in_reg(1);
in_reg(2);
in_reg(3);
in_reg(4);
in_reg(5);
in_reg(6);
in_reg(7);
in_reg(8);
in_reg(9);
in_reg(10);
in_reg(11);
in_reg(12);
in_reg(13);
in_reg(14);
in_reg(15);

static ssize_t show_in16(struct device *dev, struct device_attribute *attr,
             char *buf)
{
    struct adm1026_data *data = adm1026_update_device(dev);
    return sprintf(buf, "%d\n", INS_FROM_REG(16, data->in[16]) -
        NEG12_OFFSET);
}
static ssize_t show_in16_min(struct device *dev, struct device_attribute *attr,
                 char *buf)
{
    struct adm1026_data *data = adm1026_update_device(dev);
    return sprintf(buf, "%d\n", INS_FROM_REG(16, data->in_min[16])
        - NEG12_OFFSET);
}
static ssize_t set_in16_min(struct device *dev, struct device_attribute *attr,
                const char *buf, size_t count)
{
    struct i2c_client *client = to_i2c_client(dev);
    struct adm1026_data *data = i2c_get_clientdata(client);
    long val;
    int err;

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

    mutex_lock(&data->update_lock);
    data->in_min[16] = INS_TO_REG(16, val + NEG12_OFFSET);
    adm1026_write_value(client, ADM1026_REG_IN_MIN[16], data->in_min[16]);
    mutex_unlock(&data->update_lock);
    return count;
}
static ssize_t show_in16_max(struct device *dev, struct device_attribute *attr,
                 char *buf)
{
    struct adm1026_data *data = adm1026_update_device(dev);
    return sprintf(buf, "%d\n", INS_FROM_REG(16, data->in_max[16])
            - NEG12_OFFSET);
}
static ssize_t set_in16_max(struct device *dev, struct device_attribute *attr,
                const char *buf, size_t count)
{
    struct i2c_client *client = to_i2c_client(dev);
    struct adm1026_data *data = i2c_get_clientdata(client);
    long val;
    int err;

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

    mutex_lock(&data->update_lock);
    data->in_max[16] = INS_TO_REG(16, val+NEG12_OFFSET);
    adm1026_write_value(client, ADM1026_REG_IN_MAX[16], data->in_max[16]);
    mutex_unlock(&data->update_lock);
    return count;
}

static SENSOR_DEVICE_ATTR(in16_input, S_IRUGO, show_in16, NULL, 16);
static SENSOR_DEVICE_ATTR(in16_min, S_IRUGO | S_IWUSR, show_in16_min,
              set_in16_min, 16);
static SENSOR_DEVICE_ATTR(in16_max, S_IRUGO | S_IWUSR, show_in16_max,
              set_in16_max, 16);


/* Now add fan read/write functions */

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 adm1026_data *data = adm1026_update_device(dev);
    return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
        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 adm1026_data *data = adm1026_update_device(dev);
    return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
        data->fan_div[nr]));
}
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 i2c_client *client = to_i2c_client(dev);
    struct adm1026_data *data = i2c_get_clientdata(client);
    long val;
    int err;

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

    mutex_lock(&data->update_lock);
    data->fan_min[nr] = FAN_TO_REG(val, data->fan_div[nr]);
    adm1026_write_value(client, ADM1026_REG_FAN_MIN(nr),
        data->fan_min[nr]);
    mutex_unlock(&data->update_lock);
    return count;
}

#define 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);

fan_offset(1);
fan_offset(2);
fan_offset(3);
fan_offset(4);
fan_offset(5);
fan_offset(6);
fan_offset(7);
fan_offset(8);

/* Adjust fan_min to account for new fan divisor */
static void fixup_fan_min(struct device *dev, int fan, int old_div)
{
    struct i2c_client *client = to_i2c_client(dev);
    struct adm1026_data *data = i2c_get_clientdata(client);
    int new_min;
    int new_div = data->fan_div[fan];

    /* 0 and 0xff are special.  Don't adjust them */
    if (data->fan_min[fan] == 0 || data->fan_min[fan] == 0xff)
        return;

    new_min = data->fan_min[fan] * old_div / new_div;
    new_min = SENSORS_LIMIT(new_min, 1, 254);
    data->fan_min[fan] = new_min;
    adm1026_write_value(client, ADM1026_REG_FAN_MIN(fan), new_min);
}

/* Now add fan_div read/write functions */
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 adm1026_data *data = adm1026_update_device(dev);
    return sprintf(buf, "%d\n", data->fan_div[nr]);
}
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 i2c_client *client = to_i2c_client(dev);
    struct adm1026_data *data = i2c_get_clientdata(client);
    long val;
    int orig_div, new_div;
    int err;

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

    new_div = DIV_TO_REG(val);

    mutex_lock(&data->update_lock);
    orig_div = data->fan_div[nr];
    data->fan_div[nr] = DIV_FROM_REG(new_div);

    if (nr < 4) { /* 0 <= nr < 4 */
        adm1026_write_value(client, ADM1026_REG_FAN_DIV_0_3,
                    (DIV_TO_REG(data->fan_div[0]) << 0) |
                    (DIV_TO_REG(data->fan_div[1]) << 2) |
                    (DIV_TO_REG(data->fan_div[2]) << 4) |
                    (DIV_TO_REG(data->fan_div[3]) << 6));
    } else { /* 3 < nr < 8 */
        adm1026_write_value(client, ADM1026_REG_FAN_DIV_4_7,
                    (DIV_TO_REG(data->fan_div[4]) << 0) |
                    (DIV_TO_REG(data->fan_div[5]) << 2) |
                    (DIV_TO_REG(data->fan_div[6]) << 4) |
                    (DIV_TO_REG(data->fan_div[7]) << 6));
    }

    if (data->fan_div[nr] != orig_div)
        fixup_fan_min(dev, nr, orig_div);

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

#define fan_offset_div(offset)                      \
static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR,     \
        show_fan_div, set_fan_div, offset - 1);

fan_offset_div(1);
fan_offset_div(2);
fan_offset_div(3);
fan_offset_div(4);
fan_offset_div(5);
fan_offset_div(6);
fan_offset_div(7);
fan_offset_div(8);

/* Temps */
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 adm1026_data *data = adm1026_update_device(dev);
    return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[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 adm1026_data *data = adm1026_update_device(dev);
    return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[nr]));
}
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 i2c_client *client = to_i2c_client(dev);
    struct adm1026_data *data = i2c_get_clientdata(client);
    long val;
    int err;

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

    mutex_lock(&data->update_lock);
    data->temp_min[nr] = TEMP_TO_REG(val);
    adm1026_write_value(client, ADM1026_REG_TEMP_MIN[nr],
        data->temp_min[nr]);
    mutex_unlock(&data->update_lock);
    return count;
}
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 adm1026_data *data = adm1026_update_device(dev);
    return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[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 i2c_client *client = to_i2c_client(dev);
    struct adm1026_data *data = i2c_get_clientdata(client);
    long val;
    int err;

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

    mutex_lock(&data->update_lock);
    data->temp_max[nr] = TEMP_TO_REG(val);
    adm1026_write_value(client, ADM1026_REG_TEMP_MAX[nr],
        data->temp_max[nr]);
    mutex_unlock(&data->update_lock);
    return count;
}

#define temp_reg(offset)                        \
static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, show_temp, \
        NULL, offset - 1);                  \
static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR,    \
        show_temp_min, set_temp_min, offset - 1);       \
static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,    \
        show_temp_max, set_temp_max, offset - 1);


temp_reg(1);
temp_reg(2);
temp_reg(3);

static ssize_t show_temp_offset(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 adm1026_data *data = adm1026_update_device(dev);
    return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_offset[nr]));
}
static ssize_t set_temp_offset(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 i2c_client *client = to_i2c_client(dev);
    struct adm1026_data *data = i2c_get_clientdata(client);
    long val;
    int err;

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

    mutex_lock(&data->update_lock);
    data->temp_offset[nr] = TEMP_TO_REG(val);
    adm1026_write_value(client, ADM1026_REG_TEMP_OFFSET[nr],
        data->temp_offset[nr]);
    mutex_unlock(&data->update_lock);
    return count;
}

#define temp_offset_reg(offset)                     \
static SENSOR_DEVICE_ATTR(temp##offset##_offset, S_IRUGO | S_IWUSR, \
        show_temp_offset, set_temp_offset, offset - 1);

temp_offset_reg(1);
temp_offset_reg(2);
temp_offset_reg(3);

static ssize_t show_temp_auto_point1_temp_hyst(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 adm1026_data *data = adm1026_update_device(dev);
    return sprintf(buf, "%d\n", TEMP_FROM_REG(
        ADM1026_FAN_ACTIVATION_TEMP_HYST + data->temp_tmin[nr]));
}
static ssize_t show_temp_auto_point2_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 adm1026_data *data = adm1026_update_device(dev);
    return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_tmin[nr] +
        ADM1026_FAN_CONTROL_TEMP_RANGE));
}
static ssize_t show_temp_auto_point1_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 adm1026_data *data = adm1026_update_device(dev);
    return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_tmin[nr]));
}
static ssize_t set_temp_auto_point1_temp(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 i2c_client *client = to_i2c_client(dev);
    struct adm1026_data *data = i2c_get_clientdata(client);
    long val;
    int err;

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

    mutex_lock(&data->update_lock);
    data->temp_tmin[nr] = TEMP_TO_REG(val);
    adm1026_write_value(client, ADM1026_REG_TEMP_TMIN[nr],
        data->temp_tmin[nr]);
    mutex_unlock(&data->update_lock);
    return count;
}

#define temp_auto_point(offset)                     \
static SENSOR_DEVICE_ATTR(temp##offset##_auto_point1_temp,      \
        S_IRUGO | S_IWUSR, show_temp_auto_point1_temp,      \
        set_temp_auto_point1_temp, offset - 1);         \
static SENSOR_DEVICE_ATTR(temp##offset##_auto_point1_temp_hyst, S_IRUGO,\
        show_temp_auto_point1_temp_hyst, NULL, offset - 1); \
static SENSOR_DEVICE_ATTR(temp##offset##_auto_point2_temp, S_IRUGO, \
        show_temp_auto_point2_temp, NULL, offset - 1);

temp_auto_point(1);
temp_auto_point(2);
temp_auto_point(3);

static ssize_t show_temp_crit_enable(struct device *dev,
        struct device_attribute *attr, char *buf)
{
    struct adm1026_data *data = adm1026_update_device(dev);
    return sprintf(buf, "%d\n", (data->config1 & CFG1_THERM_HOT) >> 4);
}
static ssize_t set_temp_crit_enable(struct device *dev,
        struct device_attribute *attr, const char *buf, size_t count)
{
    struct i2c_client *client = to_i2c_client(dev);
    struct adm1026_data *data = i2c_get_clientdata(client);
    unsigned long val;
    int err;

    err = kstrtoul(buf, 10, &val);
    if (err)
        return err;

    if (val > 1)
        return -EINVAL;

    mutex_lock(&data->update_lock);
    data->config1 = (data->config1 & ~CFG1_THERM_HOT) | (val << 4);
    adm1026_write_value(client, ADM1026_REG_CONFIG1, data->config1);
    mutex_unlock(&data->update_lock);

    return count;
}

#define temp_crit_enable(offset)                \
static DEVICE_ATTR(temp##offset##_crit_enable, S_IRUGO | S_IWUSR, \
    show_temp_crit_enable, set_temp_crit_enable);

temp_crit_enable(1);
temp_crit_enable(2);
temp_crit_enable(3);

static ssize_t show_temp_crit(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 adm1026_data *data = adm1026_update_device(dev);
    return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit[nr]));
}
static ssize_t set_temp_crit(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 i2c_client *client = to_i2c_client(dev);
    struct adm1026_data *data = i2c_get_clientdata(client);
    long val;
    int err;

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

    mutex_lock(&data->update_lock);
    data->temp_crit[nr] = TEMP_TO_REG(val);
    adm1026_write_value(client, ADM1026_REG_TEMP_THERM[nr],
        data->temp_crit[nr]);
    mutex_unlock(&data->update_lock);
    return count;
}

#define temp_crit_reg(offset)                       \
static SENSOR_DEVICE_ATTR(temp##offset##_crit, S_IRUGO | S_IWUSR,   \
        show_temp_crit, set_temp_crit, offset - 1);

temp_crit_reg(1);
temp_crit_reg(2);
temp_crit_reg(3);

static ssize_t show_analog_out_reg(struct device *dev,
                   struct device_attribute *attr, char *buf)
{
    struct adm1026_data *data = adm1026_update_device(dev);
    return sprintf(buf, "%d\n", DAC_FROM_REG(data->analog_out));
}
static ssize_t set_analog_out_reg(struct device *dev,
                  struct device_attribute *attr,
                  const char *buf, size_t count)
{
    struct i2c_client *client = to_i2c_client(dev);
    struct adm1026_data *data = i2c_get_clientdata(client);
    long val;
    int err;

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

    mutex_lock(&data->update_lock);
    data->analog_out = DAC_TO_REG(val);
    adm1026_write_value(client, ADM1026_REG_DAC, data->analog_out);
    mutex_unlock(&data->update_lock);
    return count;
}

static DEVICE_ATTR(analog_out, S_IRUGO | S_IWUSR, show_analog_out_reg,
    set_analog_out_reg);

static ssize_t show_vid_reg(struct device *dev, struct device_attribute *attr,
                char *buf)
{
    struct adm1026_data *data = adm1026_update_device(dev);
    int vid = (data->gpio >> 11) & 0x1f;

    dev_dbg(dev, "Setting VID from GPIO11-15.\n");
    return sprintf(buf, "%d\n", vid_from_reg(vid, data->vrm));
}

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

static ssize_t show_vrm_reg(struct device *dev, struct device_attribute *attr,
                char *buf)
{
    struct adm1026_data *data = dev_get_drvdata(dev);
    return sprintf(buf, "%d\n", data->vrm);
}

static ssize_t store_vrm_reg(struct device *dev, struct device_attribute *attr,
                 const char *buf, size_t count)
{
    struct adm1026_data *data = dev_get_drvdata(dev);
    unsigned long val;
    int err;

    err = kstrtoul(buf, 10, &val);
    if (err)
        return err;

    data->vrm = val;
    return count;
}

static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm_reg, store_vrm_reg);

static ssize_t show_alarms_reg(struct device *dev,
                   struct device_attribute *attr, char *buf)
{
    struct adm1026_data *data = adm1026_update_device(dev);
    return sprintf(buf, "%ld\n", data->alarms);
}

static DEVICE_ATTR(alarms, S_IRUGO, show_alarms_reg, NULL);

static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
              char *buf)
{
    struct adm1026_data *data = adm1026_update_device(dev);
    int bitnr = to_sensor_dev_attr(attr)->index;
    return sprintf(buf, "%ld\n", (data->alarms >> bitnr) & 1);
}

static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 0);
static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 1);
static SENSOR_DEVICE_ATTR(in9_alarm, S_IRUGO, show_alarm, NULL, 1);
static SENSOR_DEVICE_ATTR(in11_alarm, S_IRUGO, show_alarm, NULL, 2);
static SENSOR_DEVICE_ATTR(in12_alarm, S_IRUGO, show_alarm, NULL, 3);
static SENSOR_DEVICE_ATTR(in13_alarm, S_IRUGO, show_alarm, NULL, 4);
static SENSOR_DEVICE_ATTR(in14_alarm, S_IRUGO, show_alarm, NULL, 5);
static SENSOR_DEVICE_ATTR(in15_alarm, S_IRUGO, show_alarm, NULL, 6);
static SENSOR_DEVICE_ATTR(in16_alarm, S_IRUGO, show_alarm, NULL, 7);
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, 16);
static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 17);
static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 18);
static SENSOR_DEVICE_ATTR(fan4_alarm, S_IRUGO, show_alarm, NULL, 19);
static SENSOR_DEVICE_ATTR(fan5_alarm, S_IRUGO, show_alarm, NULL, 20);
static SENSOR_DEVICE_ATTR(fan6_alarm, S_IRUGO, show_alarm, NULL, 21);
static SENSOR_DEVICE_ATTR(fan7_alarm, S_IRUGO, show_alarm, NULL, 22);
static SENSOR_DEVICE_ATTR(fan8_alarm, S_IRUGO, show_alarm, NULL, 23);
static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 24);
static SENSOR_DEVICE_ATTR(in10_alarm, S_IRUGO, show_alarm, NULL, 25);
static SENSOR_DEVICE_ATTR(in8_alarm, S_IRUGO, show_alarm, NULL, 26);

static ssize_t show_alarm_mask(struct device *dev,
                   struct device_attribute *attr, char *buf)
{
    struct adm1026_data *data = adm1026_update_device(dev);
    return sprintf(buf, "%ld\n", data->alarm_mask);
}
static ssize_t set_alarm_mask(struct device *dev, struct device_attribute *attr,
                  const char *buf, size_t count)
{
    struct i2c_client *client = to_i2c_client(dev);
    struct adm1026_data *data = i2c_get_clientdata(client);
    unsigned long mask;
    long val;
    int err;

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

    mutex_lock(&data->update_lock);
    data->alarm_mask = val & 0x7fffffff;
    mask = data->alarm_mask
        | (data->gpio_mask & 0x10000 ? 0x80000000 : 0);
    adm1026_write_value(client, ADM1026_REG_MASK1,
        mask & 0xff);
    mask >>= 8;
    adm1026_write_value(client, ADM1026_REG_MASK2,
        mask & 0xff);
    mask >>= 8;
    adm1026_write_value(client, ADM1026_REG_MASK3,
        mask & 0xff);
    mask >>= 8;
    adm1026_write_value(client, ADM1026_REG_MASK4,
        mask & 0xff);
    mutex_unlock(&data->update_lock);
    return count;
}

static DEVICE_ATTR(alarm_mask, S_IRUGO | S_IWUSR, show_alarm_mask,
    set_alarm_mask);


static ssize_t show_gpio(struct device *dev, struct device_attribute *attr,
             char *buf)
{
    struct adm1026_data *data = adm1026_update_device(dev);
    return sprintf(buf, "%ld\n", data->gpio);
}
static ssize_t set_gpio(struct device *dev, struct device_attribute *attr,
            const char *buf, size_t count)
{
    struct i2c_client *client = to_i2c_client(dev);
    struct adm1026_data *data = i2c_get_clientdata(client);
    long gpio;
    long val;
    int err;

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

    mutex_lock(&data->update_lock);
    data->gpio = val & 0x1ffff;
    gpio = data->gpio;
    adm1026_write_value(client, ADM1026_REG_GPIO_STATUS_0_7, gpio & 0xff);
    gpio >>= 8;
    adm1026_write_value(client, ADM1026_REG_GPIO_STATUS_8_15, gpio & 0xff);
    gpio = ((gpio >> 1) & 0x80) | (data->alarms >> 24 & 0x7f);
    adm1026_write_value(client, ADM1026_REG_STATUS4, gpio & 0xff);
    mutex_unlock(&data->update_lock);
    return count;
}

static DEVICE_ATTR(gpio, S_IRUGO | S_IWUSR, show_gpio, set_gpio);

static ssize_t show_gpio_mask(struct device *dev, struct device_attribute *attr,
                  char *buf)
{
    struct adm1026_data *data = adm1026_update_device(dev);
    return sprintf(buf, "%ld\n", data->gpio_mask);
}
static ssize_t set_gpio_mask(struct device *dev, struct device_attribute *attr,
                 const char *buf, size_t count)
{
    struct i2c_client *client = to_i2c_client(dev);
    struct adm1026_data *data = i2c_get_clientdata(client);
    long mask;
    long val;
    int err;

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

    mutex_lock(&data->update_lock);
    data->gpio_mask = val & 0x1ffff;
    mask = data->gpio_mask;
    adm1026_write_value(client, ADM1026_REG_GPIO_MASK_0_7, mask & 0xff);
    mask >>= 8;
    adm1026_write_value(client, ADM1026_REG_GPIO_MASK_8_15, mask & 0xff);
    mask = ((mask >> 1) & 0x80) | (data->alarm_mask >> 24 & 0x7f);
    adm1026_write_value(client, ADM1026_REG_MASK1, mask & 0xff);
    mutex_unlock(&data->update_lock);
    return count;
}

static DEVICE_ATTR(gpio_mask, S_IRUGO | S_IWUSR, show_gpio_mask, set_gpio_mask);

static ssize_t show_pwm_reg(struct device *dev, struct device_attribute *attr,
                char *buf)
{
    struct adm1026_data *data = adm1026_update_device(dev);
    return sprintf(buf, "%d\n", PWM_FROM_REG(data->pwm1.pwm));
}

static ssize_t set_pwm_reg(struct device *dev, struct device_attribute *attr,
               const char *buf, size_t count)
{
    struct i2c_client *client = to_i2c_client(dev);
    struct adm1026_data *data = i2c_get_clientdata(client);

    if (data->pwm1.enable == 1) {
        long val;
        int err;

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

        mutex_lock(&data->update_lock);
        data->pwm1.pwm = PWM_TO_REG(val);
        adm1026_write_value(client, ADM1026_REG_PWM, data->pwm1.pwm);
        mutex_unlock(&data->update_lock);
    }
    return count;
}

static ssize_t show_auto_pwm_min(struct device *dev,
                 struct device_attribute *attr, char *buf)
{
    struct adm1026_data *data = adm1026_update_device(dev);
    return sprintf(buf, "%d\n", data->pwm1.auto_pwm_min);
}

static ssize_t set_auto_pwm_min(struct device *dev,
                struct device_attribute *attr, const char *buf,
                size_t count)
{
    struct i2c_client *client = to_i2c_client(dev);
    struct adm1026_data *data = i2c_get_clientdata(client);
    unsigned long val;
    int err;

    err = kstrtoul(buf, 10, &val);
    if (err)
        return err;

    mutex_lock(&data->update_lock);
    data->pwm1.auto_pwm_min = SENSORS_LIMIT(val, 0, 255);
    if (data->pwm1.enable == 2) { /* apply immediately */
        data->pwm1.pwm = PWM_TO_REG((data->pwm1.pwm & 0x0f) |
            PWM_MIN_TO_REG(data->pwm1.auto_pwm_min));
        adm1026_write_value(client, ADM1026_REG_PWM, data->pwm1.pwm);
    }
    mutex_unlock(&data->update_lock);
    return count;
}

static ssize_t show_auto_pwm_max(struct device *dev,
                 struct device_attribute *attr, char *buf)
{
    return sprintf(buf, "%d\n", ADM1026_PWM_MAX);
}

static ssize_t show_pwm_enable(struct device *dev,
                   struct device_attribute *attr, char *buf)
{
    struct adm1026_data *data = adm1026_update_device(dev);
    return sprintf(buf, "%d\n", data->pwm1.enable);
}

static ssize_t set_pwm_enable(struct device *dev, struct device_attribute *attr,
                  const char *buf, size_t count)
{
    struct i2c_client *client = to_i2c_client(dev);
    struct adm1026_data *data = i2c_get_clientdata(client);
    int old_enable;
    unsigned long val;
    int err;

    err = kstrtoul(buf, 10, &val);
    if (err)
        return err;

    if (val >= 3)
        return -EINVAL;

    mutex_lock(&data->update_lock);
    old_enable = data->pwm1.enable;
    data->pwm1.enable = val;
    data->config1 = (data->config1 & ~CFG1_PWM_AFC)
            | ((val == 2) ? CFG1_PWM_AFC : 0);
    adm1026_write_value(client, ADM1026_REG_CONFIG1, data->config1);
    if (val == 2) { /* apply pwm1_auto_pwm_min to pwm1 */
        data->pwm1.pwm = PWM_TO_REG((data->pwm1.pwm & 0x0f) |
            PWM_MIN_TO_REG(data->pwm1.auto_pwm_min));
        adm1026_write_value(client, ADM1026_REG_PWM, data->pwm1.pwm);
    } else if (!((old_enable == 1) && (val == 1))) {
        /* set pwm to safe value */
        data->pwm1.pwm = 255;
        adm1026_write_value(client, ADM1026_REG_PWM, data->pwm1.pwm);
    }
    mutex_unlock(&data->update_lock);

    return count;
}

/* enable PWM fan control */
static DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm_reg, set_pwm_reg);
static DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, show_pwm_reg, set_pwm_reg);
static DEVICE_ATTR(pwm3, S_IRUGO | S_IWUSR, show_pwm_reg, set_pwm_reg);
static DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR, show_pwm_enable,
    set_pwm_enable);
static DEVICE_ATTR(pwm2_enable, S_IRUGO | S_IWUSR, show_pwm_enable,
    set_pwm_enable);
static DEVICE_ATTR(pwm3_enable, S_IRUGO | S_IWUSR, show_pwm_enable,
    set_pwm_enable);
static DEVICE_ATTR(temp1_auto_point1_pwm, S_IRUGO | S_IWUSR,
    show_auto_pwm_min, set_auto_pwm_min);
static DEVICE_ATTR(temp2_auto_point1_pwm, S_IRUGO | S_IWUSR,
    show_auto_pwm_min, set_auto_pwm_min);
static DEVICE_ATTR(temp3_auto_point1_pwm, S_IRUGO | S_IWUSR,
    show_auto_pwm_min, set_auto_pwm_min);

static DEVICE_ATTR(temp1_auto_point2_pwm, S_IRUGO, show_auto_pwm_max, NULL);
static DEVICE_ATTR(temp2_auto_point2_pwm, S_IRUGO, show_auto_pwm_max, NULL);
static DEVICE_ATTR(temp3_auto_point2_pwm, S_IRUGO, show_auto_pwm_max, NULL);

static struct attribute *adm1026_attributes[] = {
    &sensor_dev_attr_in0_input.dev_attr.attr,
    &sensor_dev_attr_in0_max.dev_attr.attr,
    &sensor_dev_attr_in0_min.dev_attr.attr,
    &sensor_dev_attr_in0_alarm.dev_attr.attr,
    &sensor_dev_attr_in1_input.dev_attr.attr,
    &sensor_dev_attr_in1_max.dev_attr.attr,
    &sensor_dev_attr_in1_min.dev_attr.attr,
    &sensor_dev_attr_in1_alarm.dev_attr.attr,
    &sensor_dev_attr_in2_input.dev_attr.attr,
    &sensor_dev_attr_in2_max.dev_attr.attr,
    &sensor_dev_attr_in2_min.dev_attr.attr,
    &sensor_dev_attr_in2_alarm.dev_attr.attr,
    &sensor_dev_attr_in3_input.dev_attr.attr,
    &sensor_dev_attr_in3_max.dev_attr.attr,
    &sensor_dev_attr_in3_min.dev_attr.attr,
    &sensor_dev_attr_in3_alarm.dev_attr.attr,
    &sensor_dev_attr_in4_input.dev_attr.attr,
    &sensor_dev_attr_in4_max.dev_attr.attr,
    &sensor_dev_attr_in4_min.dev_attr.attr,
    &sensor_dev_attr_in4_alarm.dev_attr.attr,
    &sensor_dev_attr_in5_input.dev_attr.attr,
    &sensor_dev_attr_in5_max.dev_attr.attr,
    &sensor_dev_attr_in5_min.dev_attr.attr,
    &sensor_dev_attr_in5_alarm.dev_attr.attr,
    &sensor_dev_attr_in6_input.dev_attr.attr,
    &sensor_dev_attr_in6_max.dev_attr.attr,
    &sensor_dev_attr_in6_min.dev_attr.attr,
    &sensor_dev_attr_in6_alarm.dev_attr.attr,
    &sensor_dev_attr_in7_input.dev_attr.attr,
    &sensor_dev_attr_in7_max.dev_attr.attr,
    &sensor_dev_attr_in7_min.dev_attr.attr,
    &sensor_dev_attr_in7_alarm.dev_attr.attr,
    &sensor_dev_attr_in10_input.dev_attr.attr,
    &sensor_dev_attr_in10_max.dev_attr.attr,
    &sensor_dev_attr_in10_min.dev_attr.attr,
    &sensor_dev_attr_in10_alarm.dev_attr.attr,
    &sensor_dev_attr_in11_input.dev_attr.attr,
    &sensor_dev_attr_in11_max.dev_attr.attr,
    &sensor_dev_attr_in11_min.dev_attr.attr,
    &sensor_dev_attr_in11_alarm.dev_attr.attr,
    &sensor_dev_attr_in12_input.dev_attr.attr,
    &sensor_dev_attr_in12_max.dev_attr.attr,
    &sensor_dev_attr_in12_min.dev_attr.attr,
    &sensor_dev_attr_in12_alarm.dev_attr.attr,
    &sensor_dev_attr_in13_input.dev_attr.attr,
    &sensor_dev_attr_in13_max.dev_attr.attr,
    &sensor_dev_attr_in13_min.dev_attr.attr,
    &sensor_dev_attr_in13_alarm.dev_attr.attr,
    &sensor_dev_attr_in14_input.dev_attr.attr,
    &sensor_dev_attr_in14_max.dev_attr.attr,
    &sensor_dev_attr_in14_min.dev_attr.attr,
    &sensor_dev_attr_in14_alarm.dev_attr.attr,
    &sensor_dev_attr_in15_input.dev_attr.attr,
    &sensor_dev_attr_in15_max.dev_attr.attr,
    &sensor_dev_attr_in15_min.dev_attr.attr,
    &sensor_dev_attr_in15_alarm.dev_attr.attr,
    &sensor_dev_attr_in16_input.dev_attr.attr,
    &sensor_dev_attr_in16_max.dev_attr.attr,
    &sensor_dev_attr_in16_min.dev_attr.attr,
    &sensor_dev_attr_in16_alarm.dev_attr.attr,
    &sensor_dev_attr_fan1_input.dev_attr.attr,
    &sensor_dev_attr_fan1_div.dev_attr.attr,
    &sensor_dev_attr_fan1_min.dev_attr.attr,
    &sensor_dev_attr_fan1_alarm.dev_attr.attr,
    &sensor_dev_attr_fan2_input.dev_attr.attr,
    &sensor_dev_attr_fan2_div.dev_attr.attr,
    &sensor_dev_attr_fan2_min.dev_attr.attr,
    &sensor_dev_attr_fan2_alarm.dev_attr.attr,
    &sensor_dev_attr_fan3_input.dev_attr.attr,
    &sensor_dev_attr_fan3_div.dev_attr.attr,
    &sensor_dev_attr_fan3_min.dev_attr.attr,
    &sensor_dev_attr_fan3_alarm.dev_attr.attr,
    &sensor_dev_attr_fan4_input.dev_attr.attr,
    &sensor_dev_attr_fan4_div.dev_attr.attr,
    &sensor_dev_attr_fan4_min.dev_attr.attr,
    &sensor_dev_attr_fan4_alarm.dev_attr.attr,
    &sensor_dev_attr_fan5_input.dev_attr.attr,
    &sensor_dev_attr_fan5_div.dev_attr.attr,
    &sensor_dev_attr_fan5_min.dev_attr.attr,
    &sensor_dev_attr_fan5_alarm.dev_attr.attr,
    &sensor_dev_attr_fan6_input.dev_attr.attr,
    &sensor_dev_attr_fan6_div.dev_attr.attr,
    &sensor_dev_attr_fan6_min.dev_attr.attr,
    &sensor_dev_attr_fan6_alarm.dev_attr.attr,
    &sensor_dev_attr_fan7_input.dev_attr.attr,
    &sensor_dev_attr_fan7_div.dev_attr.attr,
    &sensor_dev_attr_fan7_min.dev_attr.attr,
    &sensor_dev_attr_fan7_alarm.dev_attr.attr,
    &sensor_dev_attr_fan8_input.dev_attr.attr,
    &sensor_dev_attr_fan8_div.dev_attr.attr,
    &sensor_dev_attr_fan8_min.dev_attr.attr,
    &sensor_dev_attr_fan8_alarm.dev_attr.attr,
    &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_alarm.dev_attr.attr,
    &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_alarm.dev_attr.attr,
    &sensor_dev_attr_temp1_offset.dev_attr.attr,
    &sensor_dev_attr_temp2_offset.dev_attr.attr,
    &sensor_dev_attr_temp1_auto_point1_temp.dev_attr.attr,
    &sensor_dev_attr_temp2_auto_point1_temp.dev_attr.attr,
    &sensor_dev_attr_temp1_auto_point1_temp_hyst.dev_attr.attr,
    &sensor_dev_attr_temp2_auto_point1_temp_hyst.dev_attr.attr,
    &sensor_dev_attr_temp1_auto_point2_temp.dev_attr.attr,
    &sensor_dev_attr_temp2_auto_point2_temp.dev_attr.attr,
    &sensor_dev_attr_temp1_crit.dev_attr.attr,
    &sensor_dev_attr_temp2_crit.dev_attr.attr,
    &dev_attr_temp1_crit_enable.attr,
    &dev_attr_temp2_crit_enable.attr,
    &dev_attr_cpu0_vid.attr,
    &dev_attr_vrm.attr,
    &dev_attr_alarms.attr,
    &dev_attr_alarm_mask.attr,
    &dev_attr_gpio.attr,
    &dev_attr_gpio_mask.attr,
    &dev_attr_pwm1.attr,
    &dev_attr_pwm2.attr,
    &dev_attr_pwm3.attr,
    &dev_attr_pwm1_enable.attr,
    &dev_attr_pwm2_enable.attr,
    &dev_attr_pwm3_enable.attr,
    &dev_attr_temp1_auto_point1_pwm.attr,
    &dev_attr_temp2_auto_point1_pwm.attr,
    &dev_attr_temp1_auto_point2_pwm.attr,
    &dev_attr_temp2_auto_point2_pwm.attr,
    &dev_attr_analog_out.attr,
    NULL
};

static const struct attribute_group adm1026_group = {
    .attrs = adm1026_attributes,
};

static struct attribute *adm1026_attributes_temp3[] = {
    &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_alarm.dev_attr.attr,
    &sensor_dev_attr_temp3_offset.dev_attr.attr,
    &sensor_dev_attr_temp3_auto_point1_temp.dev_attr.attr,
    &sensor_dev_attr_temp3_auto_point1_temp_hyst.dev_attr.attr,
    &sensor_dev_attr_temp3_auto_point2_temp.dev_attr.attr,
    &sensor_dev_attr_temp3_crit.dev_attr.attr,
    &dev_attr_temp3_crit_enable.attr,
    &dev_attr_temp3_auto_point1_pwm.attr,
    &dev_attr_temp3_auto_point2_pwm.attr,
    NULL
};

static const struct attribute_group adm1026_group_temp3 = {
    .attrs = adm1026_attributes_temp3,
};

static struct attribute *adm1026_attributes_in8_9[] = {
    &sensor_dev_attr_in8_input.dev_attr.attr,
    &sensor_dev_attr_in8_max.dev_attr.attr,
    &sensor_dev_attr_in8_min.dev_attr.attr,
    &sensor_dev_attr_in8_alarm.dev_attr.attr,
    &sensor_dev_attr_in9_input.dev_attr.attr,
    &sensor_dev_attr_in9_max.dev_attr.attr,
    &sensor_dev_attr_in9_min.dev_attr.attr,
    &sensor_dev_attr_in9_alarm.dev_attr.attr,
    NULL
};

static const struct attribute_group adm1026_group_in8_9 = {
    .attrs = adm1026_attributes_in8_9,
};

/* Return 0 if detection is successful, -ENODEV otherwise */
static int adm1026_detect(struct i2c_client *client,
              struct i2c_board_info *info)
{
    struct i2c_adapter *adapter = client->adapter;
    int address = client->addr;
    int company, verstep;

    if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
        /* We need to be able to do byte I/O */
        return -ENODEV;
    };

    /* Now, we do the remaining detection. */

    company = adm1026_read_value(client, ADM1026_REG_COMPANY);
    verstep = adm1026_read_value(client, ADM1026_REG_VERSTEP);

    dev_dbg(&adapter->dev, "Detecting device at %d,0x%02x with"
        " COMPANY: 0x%02x and VERSTEP: 0x%02x\n",
        i2c_adapter_id(client->adapter), client->addr,
        company, verstep);

    /* Determine the chip type. */
    dev_dbg(&adapter->dev, "Autodetecting device at %d,0x%02x...\n",
        i2c_adapter_id(adapter), address);
    if (company == ADM1026_COMPANY_ANALOG_DEV
        && verstep == ADM1026_VERSTEP_ADM1026) {
        /* Analog Devices ADM1026 */
    } else if (company == ADM1026_COMPANY_ANALOG_DEV
        && (verstep & 0xf0) == ADM1026_VERSTEP_GENERIC) {
        dev_err(&adapter->dev, "Unrecognized stepping "
            "0x%02x. Defaulting to ADM1026.\n", verstep);
    } else if ((verstep & 0xf0) == ADM1026_VERSTEP_GENERIC) {
        dev_err(&adapter->dev, "Found version/stepping "
            "0x%02x. Assuming generic ADM1026.\n",
            verstep);
    } else {
        dev_dbg(&adapter->dev, "Autodetection failed\n");
        /* Not an ADM1026... */
        return -ENODEV;
    }

    strlcpy(info->type, "adm1026", I2C_NAME_SIZE);

    return 0;
}

static int adm1026_probe(struct i2c_client *client,
             const struct i2c_device_id *id)
{
    struct adm1026_data *data;
    int err;

    data = devm_kzalloc(&client->dev, sizeof(struct adm1026_data),
                GFP_KERNEL);
    if (!data)
        return -ENOMEM;

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

    /* Set the VRM version */
    data->vrm = vid_which_vrm();

    /* Initialize the ADM1026 chip */
    adm1026_init_client(client);

    /* Register sysfs hooks */
    err = sysfs_create_group(&client->dev.kobj, &adm1026_group);
    if (err)
        return err;
    if (data->config1 & CFG1_AIN8_9)
        err = sysfs_create_group(&client->dev.kobj,
                     &adm1026_group_in8_9);
    else
        err = sysfs_create_group(&client->dev.kobj,
                     &adm1026_group_temp3);
    if (err)
        goto exitremove;

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

    return 0;

    /* Error out and cleanup code */
exitremove:
    sysfs_remove_group(&client->dev.kobj, &adm1026_group);
    if (data->config1 & CFG1_AIN8_9)
        sysfs_remove_group(&client->dev.kobj, &adm1026_group_in8_9);
    else
        sysfs_remove_group(&client->dev.kobj, &adm1026_group_temp3);
    return err;
}

static int adm1026_remove(struct i2c_client *client)
{
    struct adm1026_data *data = i2c_get_clientdata(client);
    hwmon_device_unregister(data->hwmon_dev);
    sysfs_remove_group(&client->dev.kobj, &adm1026_group);
    if (data->config1 & CFG1_AIN8_9)
        sysfs_remove_group(&client->dev.kobj, &adm1026_group_in8_9);
    else
        sysfs_remove_group(&client->dev.kobj, &adm1026_group_temp3);
    return 0;
}

module_i2c_driver(adm1026_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Philip Pokorny <[email protected]>, "
          "Justin Thiessen <[email protected]>");
MODULE_DESCRIPTION("ADM1026 driver");