/*
 * adm1026.c - Part of lm_sensors, Linux kernel modules for hardware
 *             monitoring
 * Copyright (C) 2002, 2003  Philip Pokorny <ppokorny@penguincomputing.com>
 * Copyright (C) 2004 Justin Thiessen <jthiessen@penguincomputing.com>
 *
 * 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)      \
                SCALE(clamp_val(val, 0, 255 * adm1026_scaling[n] / 192), \
                      adm1026_scaling[n], 192)
#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 : \
                                clamp_val(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) DIV_ROUND_CLOSEST(clamp_val(val, -128000, 127000), \
                                           1000)
#define TEMP_FROM_REG(val) ((val) * 1000)
#define OFFSET_TO_REG(val) DIV_ROUND_CLOSEST(clamp_val(val, -128000, 127000), \
                                             1000)
#define OFFSET_FROM_REG(val) ((val) * 1000)

#define PWM_TO_REG(val) (clamp_val(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) DIV_ROUND_CLOSEST(clamp_val(val, 0, 2500) * 255, \
                                          2500)
#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 i2c_client *client;
        const struct attribute_group *groups[3];

        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_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 struct adm1026_data *adm1026_update_device(struct device *dev)
{
        struct adm1026_data *data = dev_get_drvdata(dev);
        struct i2c_client *client = data->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 adm1026_data *data = dev_get_drvdata(dev);
        struct i2c_client *client = data->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 adm1026_data *data = dev_get_drvdata(dev);
        struct i2c_client *client = data->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 adm1026_data *data = dev_get_drvdata(dev);
        struct i2c_client *client = data->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,
                                      clamp_val(val, INT_MIN,
                                                INT_MAX - NEG12_OFFSET) +
                                      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 adm1026_data *data = dev_get_drvdata(dev);
        struct i2c_client *client = data->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,
                                      clamp_val(val, INT_MIN,
                                                INT_MAX - NEG12_OFFSET) +
                                      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 adm1026_data *data = dev_get_drvdata(dev);
        struct i2c_client *client = data->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 adm1026_data *data = dev_get_drvdata(dev);
        struct i2c_client *client = data->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 = clamp_val(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 adm1026_data *data = dev_get_drvdata(dev);
        struct i2c_client *client = data->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 adm1026_data *data = dev_get_drvdata(dev);
        struct i2c_client *client = data->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 adm1026_data *data = dev_get_drvdata(dev);
        struct i2c_client *client = data->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 adm1026_data *data = dev_get_drvdata(dev);
        struct i2c_client *client = data->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 adm1026_data *data = dev_get_drvdata(dev);
        struct i2c_client *client = data->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 adm1026_data *data = dev_get_drvdata(dev);
        struct i2c_client *client = data->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 adm1026_data *data = dev_get_drvdata(dev);
        struct i2c_client *client = data->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 analog_out_show(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 analog_out_store(struct device *dev,
                                struct device_attribute *attr,
                                const char *buf, size_t count)
{
        struct adm1026_data *data = dev_get_drvdata(dev);
        struct i2c_client *client = data->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_RW(analog_out);

static ssize_t cpu0_vid_show(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_RO(cpu0_vid);

static ssize_t vrm_show(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 vrm_store(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;

        if (val > 255)
                return -EINVAL;

        data->vrm = val;
        return count;
}

static DEVICE_ATTR_RW(vrm);

static ssize_t alarms_show(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_RO(alarms);

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 alarm_mask_show(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 alarm_mask_store(struct device *dev,
                                struct device_attribute *attr,
                                const char *buf, size_t count)
{
        struct adm1026_data *data = dev_get_drvdata(dev);
        struct i2c_client *client = data->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_RW(alarm_mask);


static ssize_t gpio_show(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 gpio_store(struct device *dev, struct device_attribute *attr,
                          const char *buf, size_t count)
{
        struct adm1026_data *data = dev_get_drvdata(dev);
        struct i2c_client *client = data->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_RW(gpio);

static ssize_t gpio_mask_show(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 gpio_mask_store(struct device *dev,
                               struct device_attribute *attr, const char *buf,
                               size_t count)
{
        struct adm1026_data *data = dev_get_drvdata(dev);
        struct i2c_client *client = data->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_RW(gpio_mask);

static ssize_t pwm1_show(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 pwm1_store(struct device *dev, struct device_attribute *attr,
                          const char *buf, size_t count)
{
        struct adm1026_data *data = dev_get_drvdata(dev);
        struct i2c_client *client = data->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 temp1_auto_point1_pwm_show(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 temp1_auto_point1_pwm_store(struct device *dev,
                                           struct device_attribute *attr,
                                           const char *buf, size_t count)
{
        struct adm1026_data *data = dev_get_drvdata(dev);
        struct i2c_client *client = data->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 = clamp_val(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 temp1_auto_point2_pwm_show(struct device *dev,
                                          struct device_attribute *attr,
                                          char *buf)
{
        return sprintf(buf, "%d\n", ADM1026_PWM_MAX);
}

static ssize_t pwm1_enable_show(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 pwm1_enable_store(struct device *dev,
                                 struct device_attribute *attr,
                                 const char *buf, size_t count)
{
        struct adm1026_data *data = dev_get_drvdata(dev);
        struct i2c_client *client = data->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_RW(pwm1);
static DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, pwm1_show, pwm1_store);
static DEVICE_ATTR(pwm3, S_IRUGO | S_IWUSR, pwm1_show, pwm1_store);
static DEVICE_ATTR_RW(pwm1_enable);
static DEVICE_ATTR(pwm2_enable, S_IRUGO | S_IWUSR, pwm1_enable_show,
                   pwm1_enable_store);
static DEVICE_ATTR(pwm3_enable, S_IRUGO | S_IWUSR, pwm1_enable_show,
                   pwm1_enable_store);
static DEVICE_ATTR_RW(temp1_auto_point1_pwm);
static DEVICE_ATTR(temp2_auto_point1_pwm, S_IRUGO | S_IWUSR,
        temp1_auto_point1_pwm_show, temp1_auto_point1_pwm_store);
static DEVICE_ATTR(temp3_auto_point1_pwm, S_IRUGO | S_IWUSR,
        temp1_auto_point1_pwm_show, temp1_auto_point1_pwm_store);

static DEVICE_ATTR_RO(temp1_auto_point2_pwm);
static DEVICE_ATTR(temp2_auto_point2_pwm, S_IRUGO, temp1_auto_point2_pwm_show,
                   NULL);
static DEVICE_ATTR(temp3_auto_point2_pwm, S_IRUGO, temp1_auto_point2_pwm_show,
                   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 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 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 int adm1026_probe(struct i2c_client *client,
                         const struct i2c_device_id *id)
{
        struct device *dev = &client->dev;
        struct device *hwmon_dev;
        struct adm1026_data *data;

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

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

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

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

        /* sysfs hooks */
        data->groups[0] = &adm1026_group;
        if (data->config1 & CFG1_AIN8_9)
                data->groups[1] = &adm1026_group_in8_9;
        else
                data->groups[1] = &adm1026_group_temp3;

        hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
                                                           data, data->groups);
        return PTR_ERR_OR_ZERO(hwmon_dev);
}

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,
        .id_table       = adm1026_id,
        .detect         = adm1026_detect,
        .address_list   = normal_i2c,
};

module_i2c_driver(adm1026_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Philip Pokorny <ppokorny@penguincomputing.com>, "
              "Justin Thiessen <jthiessen@penguincomputing.com>");
MODULE_DESCRIPTION("ADM1026 driver");