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/*

    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.analog.com/UploadedFiles/Data_Sheets/779263102ADM1026_a.pdf>

    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 unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };

/* Insmod parameters */

I2C_CLIENT_INSMOD_1(adm1026);

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 acording to built-in resistors.  These are the

 *   voltages corresponding to 3/4 of full scale (192 or 0xc0)

 *   NOTE: The -12V input needs an additional factor to account

 *      for the Vref pullup resistor.

 *      NEG12_OFFSET = SCALE * Vref / V-192 - Vref

 *                   = 13875 * 2.50 / 1.875 - 2500

 *                   = 16000

 *

 * The values in this table are based on Table II, page 15 of the

 *    datasheet.

 */

static int adm1026_scaling[] = {  /* .001 Volts */

                2250, 2250, 2250, 2250, 2250, 2250,

                1875, 1875, 1875, 1875, 3000, 3330,

                3330, 4995, 2250, 12000, 13875

        };

#define NEG12_OFFSET  16000

#define SCALE(val,from,to) (((val)*(to) + ((from)/2))/(from))

#define INS_TO_REG(n,val)  (SENSORS_LIMIT(SCALE(val,adm1026_scaling[n],192),\

        0,255))

#define INS_FROM_REG(n,val) (SCALE(val,192,adm1026_scaling[n]))

/* FAN speed is measured using 22.5kHz clock and counts for 2 pulses

 *   and we assume a 2 pulse-per-rev fan tach signal

 *      22500 kHz * 60 (sec/min) * 2 (pulse) / 2 (pulse/rev) == 1350000

 */

#define FAN_TO_REG(val,div)  ((val)<=0 ? 0xff : SENSORS_LIMIT(1350000/((val)*\

        (div)),1,254))

#define FAN_FROM_REG(val,div) ((val)==0?-1:(val)==0xff ? 0 : 1350000/((val)*\

        (div)))

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

#define DIV_TO_REG(val) ((val)>=8 ? 3 : (val)>=4 ? 2 : (val)>=2 ? 1 : 0)

/* Temperature is reported in 1 degC increments */

#define TEMP_TO_REG(val) (SENSORS_LIMIT(((val)+((val)<0 ? -500 : 500))/1000,\

        -127,127))

#define TEMP_FROM_REG(val) ((val) * 1000)

#define OFFSET_TO_REG(val) (SENSORS_LIMIT(((val)+((val)<0 ? -500 : 500))/1000,\

        -127,127))

#define OFFSET_FROM_REG(val) ((val) * 1000)

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

#define PWM_FROM_REG(val) (val)

#define PWM_MIN_TO_REG(val) ((val) & 0xf0)

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

/* Analog output is a voltage, and scaled to millivolts.  The datasheet

 *   indicates that the DAC could be used to drive the fans, but in our

 *   example board (Arima HDAMA) it isn't connected to the fans at all.

 */

#define DAC_TO_REG(val) (SENSORS_LIMIT(((((val)*255)+500)/2500),0,255)) 

#define DAC_FROM_REG(val) (((val)*2500)/255)

/* Typically used with systems using a v9.1 VRM spec ? */

#define ADM1026_INIT_VRM  91

/* 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;

        struct device *hwmon_dev;

        enum chips type;

        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 */

        int vid;                /* Decoded value */

        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_attach_adapter(struct i2c_adapter *adapter);

static int adm1026_detect(struct i2c_adapter *adapter, int address,

        int kind);

static int adm1026_detach_client(struct i2c_client *client);

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

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

static void adm1026_print_gpio(struct i2c_client *client);

static void adm1026_fixup_gpio(struct i2c_client *client);

static struct adm1026_data *adm1026_update_device(struct device *dev);

static void adm1026_init_client(struct i2c_client *client);

static struct i2c_driver adm1026_driver = {

        .driver = {

                .name   = "adm1026",

        },

        .attach_adapter = adm1026_attach_adapter,

        .detach_client  = adm1026_detach_client,

};

static int adm1026_attach_adapter(struct i2c_adapter *adapter)

{

        if (!(adapter->class & I2C_CLASS_HWMON)) {

                return 0;

        }

        return i2c_probe(adapter, &addr_data, adm1026_detect);

}

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

{

        int res;

        if (reg < 0x80) {

                /* "RAM" locations */

                res = i2c_smbus_read_byte_data(client, reg) & 0xff;

        } else {

                /* EEPROM, do nothing */

                res = 0;

        }

        return res;

}

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

{

        int res;

        if (reg < 0x80) {

                /* "RAM" locations */

                res = i2c_smbus_write_byte_data(client, reg, value);

        } else {

                /* EEPROM, do nothing */

                res = 0;

        }

        return res;

}

static void adm1026_init_client(struct i2c_client *client)

{

        int value, i;

        struct adm1026_data *data = i2c_get_clientdata(client);

        dev_dbg(&client->dev, "Initializing device\n");

        /* Read chip config */

        data->config1 = adm1026_read_value(client, ADM1026_REG_CONFIG1);

        data->config2 = adm1026_read_value(client, ADM1026_REG_CONFIG2);

        data->config3 = adm1026_read_value(client, ADM1026_REG_CONFIG3);

        /* Inform user of chip config */

        dev_dbg(&client->dev, "ADM1026_REG_CONFIG1 is: 0x%02x\n",

                data->config1);

        if ((data->config1 & CFG1_MONITOR) == 0) {

                dev_dbg(&client->dev, "Monitoring not currently "

                        "enabled.\n");

        }

        if (data->config1 & CFG1_INT_ENABLE) {

                dev_dbg(&client->dev, "SMBALERT interrupts are "

                        "enabled.\n");

        }

        if (data->config1 & CFG1_AIN8_9) {

                dev_dbg(&client->dev, "in8 and in9 enabled. "

                        "temp3 disabled.\n");

        } else {

                dev_dbg(&client->dev, "temp3 enabled.  in8 and "

                        "in9 disabled.\n");

        }

        if (data->config1 & CFG1_THERM_HOT) {

                dev_dbg(&client->dev, "Automatic THERM, PWM, "

                        "and temp limits enabled.\n");

        }

        value = data->config3;

        if (data->config3 & CFG3_GPIO16_ENABLE) {

                dev_dbg(&client->dev, "GPIO16 enabled.  THERM "

                        "pin disabled.\n");

        } else {

                dev_dbg(&client->dev, "THERM pin enabled.  "

                        "GPIO16 disabled.\n");

        }

        if (data->config3 & CFG3_VREF_250) {

                dev_dbg(&client->dev, "Vref is 2.50 Volts.\n");

        } else {

                dev_dbg(&client->dev, "Vref is 1.82 Volts.\n");

        }

        /* Read and pick apart the existing GPIO configuration */

        value = 0;

        for (i = 0;i <= 15;++i) {

                if ((i & 0x03) == 0) {

                        value = adm1026_read_value(client,

                                        ADM1026_REG_GPIO_CFG_0_3 + i/4);

                }

                data->gpio_config[i] = value & 0x03;

                value >>= 2;

        }

        data->gpio_config[16] = (data->config3 >> 6) & 0x03;

        /* ... and then print it */

        adm1026_print_gpio(client);

        /* If the user asks us to reprogram the GPIO config, then

         * do it now.

         */

        if (gpio_input[0] != -1 || gpio_output[0] != -1

                || gpio_inverted[0] != -1 || gpio_normal[0] != -1

                || gpio_fan[0] != -1) {

                adm1026_fixup_gpio(client);

        }

        /* WE INTENTIONALLY make no changes to the limits,

         *   offsets, pwms, fans and zones.  If they were

         *   configured, we don't want to mess with them.

         *   If they weren't, the default is 100% PWM, no

         *   control and will suffice until 'sensors -s'

         *   can be run by the user.  We DO set the default

         *   value for pwm1.auto_pwm_min to its maximum

         *   so that enabling automatic pwm fan control

         *   without first setting a value for pwm1.auto_pwm_min

         *   will not result in potentially dangerous fan speed decrease.

         */

        data->pwm1.auto_pwm_min=255;

        /* Start monitoring */

        value = adm1026_read_value(client, ADM1026_REG_CONFIG1);

        /* Set MONITOR, clear interrupt acknowledge and s/w reset */

        value = (value | CFG1_MONITOR) & (~CFG1_INT_CLEAR & ~CFG1_RESET);

        dev_dbg(&client->dev, "Setting CONFIG to: 0x%02x\n", value);

        data->config1 = value;

        adm1026_write_value(client, ADM1026_REG_CONFIG1, value);

        /* initialize fan_div[] to hardware defaults */

        value = adm1026_read_value(client, ADM1026_REG_FAN_DIV_0_3) |

                (adm1026_read_value(client, ADM1026_REG_FAN_DIV_4_7) << 8);

        for (i = 0;i <= 7;++i) {

                data->fan_div[i] = DIV_FROM_REG(value & 0x03);

                value >>= 2;

        }

}

static void adm1026_print_gpio(struct i2c_client *client)

{

        struct adm1026_data *data = i2c_get_clientdata(client);

        int  i;

        dev_dbg(&client->dev, "GPIO config is:");

        for (i = 0;i <= 7;++i) {

                if (data->config2 & (1 << i)) {

                        dev_dbg(&client->dev, "\t%sGP%s%d\n",

                                data->gpio_config[i] & 0x02 ? "" : "!",

                                data->gpio_config[i] & 0x01 ? "OUT" : "IN",

                                i);

                } else {

                        dev_dbg(&client->dev, "\tFAN%d\n", i);

                }

        }

        for (i = 8;i <= 15;++i) {

                dev_dbg(&client->dev, "\t%sGP%s%d\n",

                        data->gpio_config[i] & 0x02 ? "" : "!",

                        data->gpio_config[i] & 0x01 ? "OUT" : "IN",

                        i);

        }

        if (data->config3 & CFG3_GPIO16_ENABLE) {

                dev_dbg(&client->dev, "\t%sGP%s16\n",

                        data->gpio_config[16] & 0x02 ? "" : "!",

                        data->gpio_config[16] & 0x01 ? "OUT" : "IN");

        } else {

                /* GPIO16 is THERM  */

                dev_dbg(&client->dev, "\tTHERM\n");

        }

}

static void adm1026_fixup_gpio(struct i2c_client *client)

{

        struct adm1026_data *data = i2c_get_clientdata(client);

        int  i;

        int  value;

        /* Make the changes requested. */

        /* We may need to unlock/stop monitoring or soft-reset the

         *    chip before we can make changes.  This hasn't been

         *    tested much.  FIXME

         */

        /* Make outputs */

        for (i = 0;i <= 16;++i) {

                if (gpio_output[i] >= 0 && gpio_output[i] <= 16) {

                        data->gpio_config[gpio_output[i]] |= 0x01;

                }

                /* if GPIO0-7 is output, it isn't a FAN tach */

                if (gpio_output[i] >= 0 && gpio_output[i] <= 7) {

                        data->config2 |= 1 << gpio_output[i];

                }

        }

        /* Input overrides output */

        for (i = 0;i <= 16;++i) {

                if (gpio_input[i] >= 0 && gpio_input[i] <= 16) {

                        data->gpio_config[gpio_input[i]] &= ~ 0x01;

                }

                /* if GPIO0-7 is input, it isn't a FAN tach */

                if (gpio_input[i] >= 0 && gpio_input[i] <= 7) {

                        data->config2 |= 1 << gpio_input[i];

                }

        }

        /* Inverted  */

        for (i = 0;i <= 16;++i) {

                if (gpio_inverted[i] >= 0 && gpio_inverted[i] <= 16) {

                        data->gpio_config[gpio_inverted[i]] &= ~ 0x02;

                }

        }

        /* Normal overrides inverted  */

        for (i = 0;i <= 16;++i) {

                if (gpio_normal[i] >= 0 && gpio_normal[i] <= 16) {

                        data->gpio_config[gpio_normal[i]] |= 0x02;

                }

        }

        /* Fan overrides input and output */

        for (i = 0;i <= 7;++i) {

                if (gpio_fan[i] >= 0 && gpio_fan[i] <= 7) {

                        data->config2 &= ~(1 << gpio_fan[i]);

                }

        }

        /* Write new configs to registers */

        adm1026_write_value(client, ADM1026_REG_CONFIG2, data->config2);

        data->config3 = (data->config3 & 0x3f)

                        | ((data->gpio_config[16] & 0x03) << 6);

        adm1026_write_value(client, ADM1026_REG_CONFIG3, data->config3);

        for (i = 15, value = 0;i >= 0;--i) {

                value <<= 2;

                value |= data->gpio_config[i] & 0x03;

                if ((i & 0x03) == 0) {

                        adm1026_write_value(client,

                                        ADM1026_REG_GPIO_CFG_0_3 + i/4,

                                        value);

                        value = 0;

                }

        }

        /* Print the new config */

        adm1026_print_gpio(client);

}

static struct adm1026_data *adm1026_update_device(struct device *dev)

{

        struct i2c_client *client = to_i2c_client(dev);

        struct adm1026_data *data = i2c_get_clientdata(client);

        int i;

        long value, alarms, gpio;

        mutex_lock(&data->update_lock);

        if (!data->valid

            || time_after(jiffies, data->last_reading + ADM1026_DATA_INTERVAL)) {

                /* Things that change quickly */

                dev_dbg(&client->dev,"Reading sensor values\n");

                for (i = 0;i <= 16;++i) {

                        data->in[i] =

                            adm1026_read_value(client, ADM1026_REG_IN[i]);

                }

                for (i = 0;i <= 7;++i) {

                        data->fan[i] =

                            adm1026_read_value(client, ADM1026_REG_FAN(i));

                }

                for (i = 0;i <= 2;++i) {

                        /* NOTE: temp[] is s8 and we assume 2's complement

                         *   "conversion" in the assignment   */

                        data->temp[i] =

                            adm1026_read_value(client, ADM1026_REG_TEMP[i]);

                }

                data->pwm1.pwm = adm1026_read_value(client,

                        ADM1026_REG_PWM);

                data->analog_out = adm1026_read_value(client,

                        ADM1026_REG_DAC);

                /* GPIO16 is MSbit of alarms, move it to gpio */

                alarms = adm1026_read_value(client, ADM1026_REG_STATUS4);

                gpio = alarms & 0x80 ? 0x0100 : 0;  /* GPIO16 */

                alarms &= 0x7f;

                alarms <<= 8;

                alarms |= adm1026_read_value(client, ADM1026_REG_STATUS3);

                alarms <<= 8;

                alarms |= adm1026_read_value(client, ADM1026_REG_STATUS2);

                alarms <<= 8;

                alarms |= adm1026_read_value(client, ADM1026_REG_STATUS1);

                data->alarms = alarms;

                /* Read the GPIO values */

                gpio |= adm1026_read_value(client,

                        ADM1026_REG_GPIO_STATUS_8_15);

                gpio <<= 8;

                gpio |= adm1026_read_value(client,

                        ADM1026_REG_GPIO_STATUS_0_7);

                data->gpio = gpio;

                data->last_reading = jiffies;

        };  /* last_reading */

        if (!data->valid ||

            time_after(jiffies, data->last_config + ADM1026_CONFIG_INTERVAL)) {

                /* Things that don't change often */

                dev_dbg(&client->dev, "Reading config values\n");

                for (i = 0;i <= 16;++i) {

                        data->in_min[i] = adm1026_read_value(client,

                                ADM1026_REG_IN_MIN[i]);

                        data->in_max[i] = adm1026_read_value(client,

                                ADM1026_REG_IN_MAX[i]);

                }

                value = adm1026_read_value(client, ADM1026_REG_FAN_DIV_0_3)

                        | (adm1026_read_value(client, ADM1026_REG_FAN_DIV_4_7)