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/*

        vt8231.c - Part of lm_sensors, Linux kernel modules

                                for hardware monitoring

        Copyright (c) 2005 Roger Lucas <roger@planbit.co.uk>

        Copyright (c) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>

                           Aaron M. Marsh <amarsh@sdf.lonestar.org>

        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.

*/

/* Supports VIA VT8231 South Bridge embedded sensors

*/

#include <linux/module.h>

#include <linux/init.h>

#include <linux/slab.h>

#include <linux/pci.h>

#include <linux/jiffies.h>

#include <linux/platform_device.h>

#include <linux/hwmon.h>

#include <linux/hwmon-sysfs.h>

#include <linux/hwmon-vid.h>

#include <linux/err.h>

#include <linux/mutex.h>

#include <asm/io.h>

static int force_addr;

module_param(force_addr, int, 0);

MODULE_PARM_DESC(force_addr, "Initialize the base address of the sensors");

static struct platform_device *pdev;

#define VT8231_EXTENT 0x80

#define VT8231_BASE_REG 0x70

#define VT8231_ENABLE_REG 0x74

/* The VT8231 registers

   The reset value for the input channel configuration is used (Reg 0x4A=0x07)

   which sets the selected inputs marked with '*' below if multiple options are

   possible:

                    Voltage Mode          Temperature Mode

        Sensor        Linux Id        Linux Id        VIA Id

        --------      --------        --------        ------

        CPU Diode       N/A             temp1           0

        UIC1            in0             temp2 *         1

        UIC2            in1 *           temp3           2

        UIC3            in2 *           temp4           3

        UIC4            in3 *           temp5           4

        UIC5            in4 *           temp6           5

        3.3V            in5             N/A

   Note that the BIOS may set the configuration register to a different value

   to match the motherboard configuration.

*/

/* fans numbered 0-1 */

#define VT8231_REG_FAN_MIN(nr)  (0x3b + (nr))

#define VT8231_REG_FAN(nr)      (0x29 + (nr))

/* Voltage inputs numbered 0-5 */

static const u8 regvolt[]    = { 0x21, 0x22, 0x23, 0x24, 0x25, 0x26 };

static const u8 regvoltmax[] = { 0x3d, 0x2b, 0x2d, 0x2f, 0x31, 0x33 };

static const u8 regvoltmin[] = { 0x3e, 0x2c, 0x2e, 0x30, 0x32, 0x34 };

/* Temperatures are numbered 1-6 according to the Linux kernel specification.

**

** In the VIA datasheet, however, the temperatures are numbered from zero.

** Since it is important that this driver can easily be compared to the VIA

** datasheet, we will use the VIA numbering within this driver and map the

** kernel sysfs device name to the VIA number in the sysfs callback.

*/

#define VT8231_REG_TEMP_LOW01   0x49

#define VT8231_REG_TEMP_LOW25   0x4d

static const u8 regtemp[]    = { 0x1f, 0x21, 0x22, 0x23, 0x24, 0x25 };

static const u8 regtempmax[] = { 0x39, 0x3d, 0x2b, 0x2d, 0x2f, 0x31 };

static const u8 regtempmin[] = { 0x3a, 0x3e, 0x2c, 0x2e, 0x30, 0x32 };

#define TEMP_FROM_REG(reg)              (((253 * 4 - (reg)) * 550 + 105) / 210)

#define TEMP_MAXMIN_FROM_REG(reg)       (((253 - (reg)) * 2200 + 105) / 210)

#define TEMP_MAXMIN_TO_REG(val)         (253 - ((val) * 210 + 1100) / 2200)

#define VT8231_REG_CONFIG 0x40

#define VT8231_REG_ALARM1 0x41

#define VT8231_REG_ALARM2 0x42

#define VT8231_REG_FANDIV 0x47

#define VT8231_REG_UCH_CONFIG 0x4a

#define VT8231_REG_TEMP1_CONFIG 0x4b

#define VT8231_REG_TEMP2_CONFIG 0x4c

/* temps 0-5 as numbered in VIA datasheet - see later for mapping to Linux

** numbering

*/

#define ISTEMP(i, ch_config) ((i) == 0 ? 1 : \

                              ((ch_config) >> ((i)+1)) & 0x01)

/* voltages 0-5 */

#define ISVOLT(i, ch_config) ((i) == 5 ? 1 : \

                              !(((ch_config) >> ((i)+2)) & 0x01))

#define DIV_FROM_REG(val) (1 << (val))

/* NB  The values returned here are NOT temperatures.  The calibration curves

**     for the thermistor curves are board-specific and must go in the

**     sensors.conf file.  Temperature sensors are actually ten bits, but the

**     VIA datasheet only considers the 8 MSBs obtained from the regtemp[]

**     register.  The temperature value returned should have a magnitude of 3,

**     so we use the VIA scaling as the "true" scaling and use the remaining 2

**     LSBs as fractional precision.

**

**     All the on-chip hardware temperature comparisons for the alarms are only

**     8-bits wide, and compare against the 8 MSBs of the temperature.  The bits

**     in the registers VT8231_REG_TEMP_LOW01 and VT8231_REG_TEMP_LOW25 are

**     ignored.

*/

/******** FAN RPM CONVERSIONS ********

** This chip saturates back at 0, not at 255 like many the other chips.

** So, 0 means 0 RPM

*/

static inline u8 FAN_TO_REG(long rpm, int div)

{

        if (rpm == 0)

                return 0;

        return SENSORS_LIMIT(1310720 / (rpm * div), 1, 255);

}

#define FAN_FROM_REG(val, div) ((val) == 0 ? 0 : 1310720 / ((val) * (div)))

struct vt8231_data {

        unsigned short addr;

        const char *name;

        struct mutex update_lock;

        struct device *hwmon_dev;

        char valid;             /* !=0 if following fields are valid */

        unsigned long last_updated;     /* In jiffies */

        u8 in[6];               /* Register value */

        u8 in_max[6];           /* Register value */

        u8 in_min[6];           /* Register value */

        u16 temp[6];            /* Register value 10 bit, right aligned */

        u8 temp_max[6];         /* Register value */

        u8 temp_min[6];         /* Register value */

        u8 fan[2];              /* Register value */

        u8 fan_min[2];          /* Register value */

        u8 fan_div[2];          /* Register encoding, shifted right */

        u16 alarms;             /* Register encoding */

        u8 uch_config;

};

static struct pci_dev *s_bridge;

static int vt8231_probe(struct platform_device *pdev);

static int __devexit vt8231_remove(struct platform_device *pdev);

static struct vt8231_data *vt8231_update_device(struct device *dev);

static void vt8231_init_device(struct vt8231_data *data);

static inline int vt8231_read_value(struct vt8231_data *data, u8 reg)

{

        return inb_p(data->addr + reg);

}

static inline void vt8231_write_value(struct vt8231_data *data, u8 reg,

                                        u8 value)

{

        outb_p(value, data->addr + reg);

}

/* following are the sysfs callback functions */

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 vt8231_data *data = vt8231_update_device(dev);

        return sprintf(buf, "%d\n", ((data->in[nr] - 3) * 10000) / 958);

}

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 vt8231_data *data = vt8231_update_device(dev);

        return sprintf(buf, "%d\n", ((data->in_min[nr] - 3) * 10000) / 958);

}

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 vt8231_data *data = vt8231_update_device(dev);

        return sprintf(buf, "%d\n", (((data->in_max[nr] - 3) * 10000) / 958));

}

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 vt8231_data *data = dev_get_drvdata(dev);

        unsigned long val = simple_strtoul(buf, NULL, 10);

        mutex_lock(&data->update_lock);

        data->in_min[nr] = SENSORS_LIMIT(((val * 958) / 10000) + 3, 0, 255);

        vt8231_write_value(data, regvoltmin[nr], data->in_min[nr]);

        mutex_unlock(&data->update_lock);

        return count;

}

static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,

                const char *buf, size_t count)

{

        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);

        int nr = sensor_attr->index;

        struct vt8231_data *data = dev_get_drvdata(dev);

        unsigned long val = simple_strtoul(buf, NULL, 10);

        mutex_lock(&data->update_lock);

        data->in_max[nr] = SENSORS_LIMIT(((val * 958) / 10000) + 3, 0, 255);

        vt8231_write_value(data, regvoltmax[nr], data->in_max[nr]);

        mutex_unlock(&data->update_lock);

        return count;

}

/* Special case for input 5 as this has 3.3V scaling built into the chip */

static ssize_t show_in5(struct device *dev, struct device_attribute *attr,

                char *buf)

{

        struct vt8231_data *data = vt8231_update_device(dev);

        return sprintf(buf, "%d\n",

                (((data->in[5] - 3) * 10000 * 54) / (958 * 34)));

}

static ssize_t show_in5_min(struct device *dev, struct device_attribute *attr,

                char *buf)

{

        struct vt8231_data *data = vt8231_update_device(dev);

        return sprintf(buf, "%d\n",

                (((data->in_min[5] - 3) * 10000 * 54) / (958 * 34)));

}

static ssize_t show_in5_max(struct device *dev, struct device_attribute *attr,

                char *buf)

{

        struct vt8231_data *data = vt8231_update_device(dev);

        return sprintf(buf, "%d\n",

                (((data->in_max[5] - 3) * 10000 * 54) / (958 * 34)));

}

static ssize_t set_in5_min(struct device *dev, struct device_attribute *attr,

                const char *buf, size_t count)

{

        struct vt8231_data *data = dev_get_drvdata(dev);

        unsigned long val = simple_strtoul(buf, NULL, 10);

        mutex_lock(&data->update_lock);

        data->in_min[5] = SENSORS_LIMIT(((val * 958 * 34) / (10000 * 54)) + 3,

                                        0, 255);

        vt8231_write_value(data, regvoltmin[5], data->in_min[5]);

        mutex_unlock(&data->update_lock);

        return count;

}

static ssize_t set_in5_max(struct device *dev, struct device_attribute *attr,

                const char *buf, size_t count)

{

        struct vt8231_data *data = dev_get_drvdata(dev);

        unsigned long val = simple_strtoul(buf, NULL, 10);

        mutex_lock(&data->update_lock);

        data->in_max[5] = SENSORS_LIMIT(((val * 958 * 34) / (10000 * 54)) + 3,

                                        0, 255);

        vt8231_write_value(data, regvoltmax[5], data->in_max[5]);

        mutex_unlock(&data->update_lock);

        return count;

}

#define define_voltage_sysfs(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)

define_voltage_sysfs(0);

define_voltage_sysfs(1);

define_voltage_sysfs(2);

define_voltage_sysfs(3);

define_voltage_sysfs(4);

static DEVICE_ATTR(in5_input, S_IRUGO, show_in5, NULL);

static DEVICE_ATTR(in5_min, S_IRUGO | S_IWUSR, show_in5_min, set_in5_min);

static DEVICE_ATTR(in5_max, S_IRUGO | S_IWUSR, show_in5_max, set_in5_max);

/* Temperatures */

static ssize_t show_temp0(struct device *dev, struct device_attribute *attr,

                char *buf)

{

        struct vt8231_data *data = vt8231_update_device(dev);

        return sprintf(buf, "%d\n", data->temp[0] * 250);

}

static ssize_t show_temp0_max(struct device *dev, struct device_attribute *attr,

                char *buf)

{

        struct vt8231_data *data = vt8231_update_device(dev);

        return sprintf(buf, "%d\n", data->temp_max[0] * 1000);

}

static ssize_t show_temp0_min(struct device *dev, struct device_attribute *attr,

                char *buf)

{

        struct vt8231_data *data = vt8231_update_device(dev);

        return sprintf(buf, "%d\n", data->temp_min[0] * 1000);

}

static ssize_t set_temp0_max(struct device *dev, struct device_attribute *attr,

                const char *buf, size_t count)

{

        struct vt8231_data *data = dev_get_drvdata(dev);

        int val = simple_strtol(buf, NULL, 10);

        mutex_lock(&data->update_lock);

        data->temp_max[0] = SENSORS_LIMIT((val + 500) / 1000, 0, 255);

        vt8231_write_value(data, regtempmax[0], data->temp_max[0]);

        mutex_unlock(&data->update_lock);

        return count;

}

static ssize_t set_temp0_min(struct device *dev, struct device_attribute *attr,

                const char *buf, size_t count)

{

        struct vt8231_data *data = dev_get_drvdata(dev);

        int val = simple_strtol(buf, NULL, 10);

        mutex_lock(&data->update_lock);

        data->temp_min[0] = SENSORS_LIMIT((val + 500) / 1000, 0, 255);

        vt8231_write_value(data, regtempmin[0], data->temp_min[0]);

        mutex_unlock(&data->update_lock);

        return count;

}

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 vt8231_data *data = vt8231_update_device(dev);

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

}

static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,

                char *buf)

{

        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);

        int nr = sensor_attr->index;

        struct vt8231_data *data = vt8231_update_device(dev);

        return sprintf(buf, "%d\n", TEMP_MAXMIN_FROM_REG(data->temp_max[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 vt8231_data *data = vt8231_update_device(dev);

        return sprintf(buf, "%d\n", TEMP_MAXMIN_FROM_REG(data->temp_min[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 vt8231_data *data = dev_get_drvdata(dev);

        int val = simple_strtol(buf, NULL, 10);

        mutex_lock(&data->update_lock);

        data->temp_max[nr] = SENSORS_LIMIT(TEMP_MAXMIN_TO_REG(val), 0, 255);

        vt8231_write_value(data, regtempmax[nr], data->temp_max[nr]);

        mutex_unlock(&data->update_lock);

        return count;

}

static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,

                const char *buf, size_t count)

{

        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);

        int nr = sensor_attr->index;

        struct vt8231_data *data = dev_get_drvdata(dev);

        int val = simple_strtol(buf, NULL, 10);

        mutex_lock(&data->update_lock);

        data->temp_min[nr] = SENSORS_LIMIT(TEMP_MAXMIN_TO_REG(val), 0, 255);

        vt8231_write_value(data, regtempmin[nr], data->temp_min[nr]);

        mutex_unlock(&data->update_lock);

        return count;

}

/* Note that these map the Linux temperature sensor numbering (1-6) to the VIA

** temperature sensor numbering (0-5)

*/

#define define_temperature_sysfs(offset)                                \

static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO,                \

                show_temp, NULL, offset - 1);                           \

static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,        \

                show_temp_max, set_temp_max, offset - 1);               \

static SENSOR_DEVICE_ATTR(temp##offset##_max_hyst, S_IRUGO | S_IWUSR,   \

                show_temp_min, set_temp_min, offset - 1)

static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp0, NULL);

static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, show_temp0_max, set_temp0_max);

static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR, show_temp0_min, set_temp0_min);

define_temperature_sysfs(2);

define_temperature_sysfs(3);

define_temperature_sysfs(4);

define_temperature_sysfs(5);

define_temperature_sysfs(6);

/* Fans */

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 vt8231_data *data = vt8231_update_device(dev);

        return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],

                                DIV_FROM_REG(data->fan_div[nr])));

}

static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,

                char *buf)

{

        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);

        int nr = sensor_attr->index;

        struct vt8231_data *data = vt8231_update_device(dev);

        return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],

                        DIV_FROM_REG(data->fan_div[nr])));

}

static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,

                char *buf)

{

        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);

        int nr = sensor_attr->index;

        struct vt8231_data *data = vt8231_update_device(dev);

        return sprintf(buf, "%d\n", DIV_FROM_REG(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 vt8231_data *data = dev_get_drvdata(dev);

        int val = simple_strtoul(buf, NULL, 10);

        mutex_lock(&data->update_lock);

        data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));

        vt8231_write_value(data, VT8231_REG_FAN_MIN(nr), data->fan_min[nr]);

        mutex_unlock(&data->update_lock);

        return count;

}

static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,

                const char *buf, size_t count)

{

        struct vt8231_data *data = dev_get_drvdata(dev);

        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);

        unsigned long val = simple_strtoul(buf, NULL, 10);

        int nr = sensor_attr->index;

        int old = vt8231_read_value(data, VT8231_REG_FANDIV);

        long min = FAN_FROM_REG(data->fan_min[nr],

                                 DIV_FROM_REG(data->fan_div[nr]));

        mutex_lock(&data->update_lock);

        switch (val) {

        case 1: data->fan_div[nr] = 0; break;

        case 2: data->fan_div[nr] = 1; break;

        case 4: data->fan_div[nr] = 2; break;

        case 8: data->fan_div[nr] = 3; break;

        default:

                dev_err(dev, "fan_div value %ld not supported."

                        "Choose one of 1, 2, 4 or 8!\n", val);

                mutex_unlock(&data->update_lock);

                return -EINVAL;

        }

        /* Correct the fan minimum speed */

        data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));

        vt8231_write_value(data, VT8231_REG_FAN_MIN(nr), data->fan_min[nr]);

        old = (old & 0x0f) | (data->fan_div[1] << 6) | (data->fan_div[0] << 4);

        vt8231_write_value(data, VT8231_REG_FANDIV, old);

        mutex_unlock(&data->update_lock);

        return count;

}

#define define_fan_sysfs(offset)                                        \

static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO,                 \

                show_fan, NULL, offset - 1);                            \

static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR,         \

                show_fan_div, set_fan_div, offset - 1);                 \

static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR,         \

                show_fan_min, set_fan_min, offset - 1)

define_fan_sysfs(1);

define_fan_sysfs(2);

/* Alarms */

static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,

                           char *buf)

{

        struct vt8231_data *data = vt8231_update_device(dev);

        return sprintf(buf, "%d\n", data->alarms);

}

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

static ssize_t show_name(struct device *dev, struct device_attribute

                         *devattr, char *buf)

{

        struct vt8231_data *data = dev_get_drvdata(dev);

        return sprintf(buf, "%s\n", data->name);

}

static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);

static struct attribute *vt8231_attributes_temps[6][4] = {

        {

                &dev_attr_temp1_input.attr,

                &dev_attr_temp1_max_hyst.attr,

                &dev_attr_temp1_max.attr,

                NULL

        }, {

                &sensor_dev_attr_temp2_input.dev_attr.attr,

                &sensor_dev_attr_temp2_max_hyst.dev_attr.attr,

                &sensor_dev_attr_temp2_max.dev_attr.attr,

                NULL

        }, {

                &sensor_dev_attr_temp3_input.dev_attr.attr,

                &sensor_dev_attr_temp3_max_hyst.dev_attr.attr,

                &sensor_dev_attr_temp3_max.dev_attr.attr,

                NULL

        }, {

                &sensor_dev_attr_temp4_input.dev_attr.attr,

                &sensor_dev_attr_temp4_max_hyst.dev_attr.attr,

                &sensor_dev_attr_temp4_max.dev_attr.attr,

                NULL

        }, {

                &sensor_dev_attr_temp5_input.dev_attr.attr,

                &sensor_dev_attr_temp5_max_hyst.dev_attr.attr,

                &sensor_dev_attr_temp5_max.dev_attr.attr,

                NULL

        }, {

                &sensor_dev_attr_temp6_input.dev_attr.attr,

                &sensor_dev_attr_temp6_max_hyst.dev_attr.attr,

                &sensor_dev_attr_temp6_max.dev_attr.attr,

                NULL

        }

};

static const struct attribute_group vt8231_group_temps[6] = {

        { .attrs = vt8231_attributes_temps[0] },

        { .attrs = vt8231_attributes_temps[1] },

        { .attrs = vt8231_attributes_temps[2] },

        { .attrs = vt8231_attributes_temps[3] },

        { .attrs = vt8231_attributes_temps[4] },

        { .attrs = vt8231_attributes_temps[5] },

};

static struct attribute *vt8231_attributes_volts[6][4] = {

        {

                &sensor_dev_attr_in0_input.dev_attr.attr,

                &sensor_dev_attr_in0_min.dev_attr.attr,

                &sensor_dev_attr_in0_max.dev_attr.attr,