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/*

    abituguru.c Copyright (c) 2005-2006 Hans de Goede <j.w.r.degoede@hhs.nl>

    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.

*/

/*

    This driver supports the sensor part of the first and second revision of

    the custom Abit uGuru chip found on Abit uGuru motherboards. Note: because

    of lack of specs the CPU/RAM voltage & frequency control is not supported!

*/

#include <linux/module.h>

#include <linux/sched.h>

#include <linux/init.h>

#include <linux/slab.h>

#include <linux/jiffies.h>

#include <linux/mutex.h>

#include <linux/err.h>

#include <linux/delay.h>

#include <linux/platform_device.h>

#include <linux/hwmon.h>

#include <linux/hwmon-sysfs.h>

#include <linux/dmi.h>

#include <asm/io.h>

/* Banks */

#define ABIT_UGURU_ALARM_BANK                   0x20 /* 1x 3 bytes */

#define ABIT_UGURU_SENSOR_BANK1                 0x21 /* 16x volt and temp */

#define ABIT_UGURU_FAN_PWM                      0x24 /* 3x 5 bytes */

#define ABIT_UGURU_SENSOR_BANK2                 0x26 /* fans */

/* max nr of sensors in bank1, a bank1 sensor can be in, temp or nc */

#define ABIT_UGURU_MAX_BANK1_SENSORS            16

/* Warning if you increase one of the 2 MAX defines below to 10 or higher you

   should adjust the belonging _NAMES_LENGTH macro for the 2 digit number! */

/* max nr of sensors in bank2, currently mb's with max 6 fans are known */

#define ABIT_UGURU_MAX_BANK2_SENSORS            6

/* max nr of pwm outputs, currently mb's with max 5 pwm outputs are known */

#define ABIT_UGURU_MAX_PWMS                     5

/* uGuru sensor bank 1 flags */                      /* Alarm if: */

#define ABIT_UGURU_TEMP_HIGH_ALARM_ENABLE       0x01 /*  temp over warn */

#define ABIT_UGURU_VOLT_HIGH_ALARM_ENABLE       0x02 /*  volt over max */

#define ABIT_UGURU_VOLT_LOW_ALARM_ENABLE        0x04 /*  volt under min */

#define ABIT_UGURU_TEMP_HIGH_ALARM_FLAG         0x10 /* temp is over warn */

#define ABIT_UGURU_VOLT_HIGH_ALARM_FLAG         0x20 /* volt is over max */

#define ABIT_UGURU_VOLT_LOW_ALARM_FLAG          0x40 /* volt is under min */

/* uGuru sensor bank 2 flags */                      /* Alarm if: */

#define ABIT_UGURU_FAN_LOW_ALARM_ENABLE         0x01 /*   fan under min */

/* uGuru sensor bank common flags */

#define ABIT_UGURU_BEEP_ENABLE                  0x08 /* beep if alarm */

#define ABIT_UGURU_SHUTDOWN_ENABLE              0x80 /* shutdown if alarm */

/* uGuru fan PWM (speed control) flags */

#define ABIT_UGURU_FAN_PWM_ENABLE               0x80 /* enable speed control */

/* Values used for conversion */

#define ABIT_UGURU_FAN_MAX                      15300 /* RPM */

/* Bank1 sensor types */

#define ABIT_UGURU_IN_SENSOR                    0

#define ABIT_UGURU_TEMP_SENSOR                  1

#define ABIT_UGURU_NC                           2

/* In many cases we need to wait for the uGuru to reach a certain status, most

   of the time it will reach this status within 30 - 90 ISA reads, and thus we

   can best busy wait. This define gives the total amount of reads to try. */

#define ABIT_UGURU_WAIT_TIMEOUT                 125

/* However sometimes older versions of the uGuru seem to be distracted and they

   do not respond for a long time. To handle this we sleep before each of the

   last ABIT_UGURU_WAIT_TIMEOUT_SLEEP tries. */

#define ABIT_UGURU_WAIT_TIMEOUT_SLEEP           5

/* Normally all expected status in abituguru_ready, are reported after the

   first read, but sometimes not and we need to poll. */

#define ABIT_UGURU_READY_TIMEOUT                5

/* Maximum 3 retries on timedout reads/writes, delay 200 ms before retrying */

#define ABIT_UGURU_MAX_RETRIES                  3

#define ABIT_UGURU_RETRY_DELAY                  (HZ/5)

/* Maximum 2 timeouts in abituguru_update_device, iow 3 in a row is an error */

#define ABIT_UGURU_MAX_TIMEOUTS                 2

/* utility macros */

#define ABIT_UGURU_NAME                         "abituguru"

#define ABIT_UGURU_DEBUG(level, format, arg...)                         \

        if (level <= verbose)                                           \

                printk(KERN_DEBUG ABIT_UGURU_NAME ": "  format , ## arg)

/* Macros to help calculate the sysfs_names array length */

/* sum of strlen of: in??_input\0, in??_{min,max}\0, in??_{min,max}_alarm\0,

   in??_{min,max}_alarm_enable\0, in??_beep\0, in??_shutdown\0 */

#define ABITUGURU_IN_NAMES_LENGTH       (11 + 2 * 9 + 2 * 15 + 2 * 22 + 10 + 14)

/* sum of strlen of: temp??_input\0, temp??_max\0, temp??_crit\0,

   temp??_alarm\0, temp??_alarm_enable\0, temp??_beep\0, temp??_shutdown\0 */

#define ABITUGURU_TEMP_NAMES_LENGTH     (13 + 11 + 12 + 13 + 20 + 12 + 16)

/* sum of strlen of: fan?_input\0, fan?_min\0, fan?_alarm\0,

   fan?_alarm_enable\0, fan?_beep\0, fan?_shutdown\0 */

#define ABITUGURU_FAN_NAMES_LENGTH      (11 + 9 + 11 + 18 + 10 + 14)

/* sum of strlen of: pwm?_enable\0, pwm?_auto_channels_temp\0,

   pwm?_auto_point{1,2}_pwm\0, pwm?_auto_point{1,2}_temp\0 */

#define ABITUGURU_PWM_NAMES_LENGTH      (12 + 24 + 2 * 21 + 2 * 22)

/* IN_NAMES_LENGTH > TEMP_NAMES_LENGTH so assume all bank1 sensors are in */

#define ABITUGURU_SYSFS_NAMES_LENGTH    ( \

        ABIT_UGURU_MAX_BANK1_SENSORS * ABITUGURU_IN_NAMES_LENGTH + \

        ABIT_UGURU_MAX_BANK2_SENSORS * ABITUGURU_FAN_NAMES_LENGTH + \

        ABIT_UGURU_MAX_PWMS * ABITUGURU_PWM_NAMES_LENGTH)

/* All the macros below are named identical to the oguru and oguru2 programs

   reverse engineered by Olle Sandberg, hence the names might not be 100%

   logical. I could come up with better names, but I prefer keeping the names

   identical so that this driver can be compared with his work more easily. */

/* Two i/o-ports are used by uGuru */

#define ABIT_UGURU_BASE                         0x00E0

/* Used to tell uGuru what to read and to read the actual data */

#define ABIT_UGURU_CMD                          0x00

/* Mostly used to check if uGuru is busy */

#define ABIT_UGURU_DATA                         0x04

#define ABIT_UGURU_REGION_LENGTH                5

/* uGuru status' */

#define ABIT_UGURU_STATUS_WRITE                 0x00 /* Ready to be written */

#define ABIT_UGURU_STATUS_READ                  0x01 /* Ready to be read */

#define ABIT_UGURU_STATUS_INPUT                 0x08 /* More input */

#define ABIT_UGURU_STATUS_READY                 0x09 /* Ready to be written */

/* Constants */

/* in (Volt) sensors go up to 3494 mV, temp to 255000 millidegrees Celsius */

static const int abituguru_bank1_max_value[2] = { 3494, 255000 };

/* Min / Max allowed values for sensor2 (fan) alarm threshold, these values

   correspond to 300-3000 RPM */

static const u8 abituguru_bank2_min_threshold = 5;

static const u8 abituguru_bank2_max_threshold = 50;

/* Register 0 is a bitfield, 1 and 2 are pwm settings (255 = 100%), 3 and 4

   are temperature trip points. */

static const int abituguru_pwm_settings_multiplier[5] = { 0, 1, 1, 1000, 1000 };

/* Min / Max allowed values for pwm_settings. Note: pwm1 (CPU fan) is a

   special case the minium allowed pwm% setting for this is 30% (77) on

   some MB's this special case is handled in the code! */

static const u8 abituguru_pwm_min[5] = { 0, 170, 170, 25, 25 };

static const u8 abituguru_pwm_max[5] = { 0, 255, 255, 75, 75 };

/* Insmod parameters */

static int force;

module_param(force, bool, 0);

MODULE_PARM_DESC(force, "Set to one to force detection.");

static int bank1_types[ABIT_UGURU_MAX_BANK1_SENSORS] = { -1, -1, -1, -1, -1,

        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 };

module_param_array(bank1_types, int, NULL, 0);

MODULE_PARM_DESC(bank1_types, "Bank1 sensortype autodetection override:\n"

        "   -1 autodetect\n"

        "    0 volt sensor\n"

        "    1 temp sensor\n"

        "    2 not connected");

static int fan_sensors;

module_param(fan_sensors, int, 0);

MODULE_PARM_DESC(fan_sensors, "Number of fan sensors on the uGuru "

        "(0 = autodetect)");

static int pwms;

module_param(pwms, int, 0);

MODULE_PARM_DESC(pwms, "Number of PWMs on the uGuru "

        "(0 = autodetect)");

/* Default verbose is 2, since this driver is still in the testing phase */

static int verbose = 2;

module_param(verbose, int, 0644);

MODULE_PARM_DESC(verbose, "How verbose should the driver be? (0-3):\n"

        "   0 normal output\n"

        "   1 + verbose error reporting\n"

        "   2 + sensors type probing info\n"

        "   3 + retryable error reporting");

/* For the Abit uGuru, we need to keep some data in memory.

   The structure is dynamically allocated, at the same time when a new

   abituguru device is allocated. */

struct abituguru_data {

        struct device *hwmon_dev;       /* hwmon registered device */

        struct mutex update_lock;       /* protect access to data and uGuru */

        unsigned long last_updated;     /* In jiffies */

        unsigned short addr;            /* uguru base address */

        char uguru_ready;               /* is the uguru in ready state? */

        unsigned char update_timeouts;  /* number of update timeouts since last

                                           successful update */

        /* The sysfs attr and their names are generated automatically, for bank1

           we cannot use a predefined array because we don't know beforehand

           of a sensor is a volt or a temp sensor, for bank2 and the pwms its

           easier todo things the same way.  For in sensors we have 9 (temp 7)

           sysfs entries per sensor, for bank2 and pwms 6. */

        struct sensor_device_attribute_2 sysfs_attr[

                ABIT_UGURU_MAX_BANK1_SENSORS * 9 +

                ABIT_UGURU_MAX_BANK2_SENSORS * 6 + ABIT_UGURU_MAX_PWMS * 6];

        /* Buffer to store the dynamically generated sysfs names */

        char sysfs_names[ABITUGURU_SYSFS_NAMES_LENGTH];

        /* Bank 1 data */

        /* number of and addresses of [0] in, [1] temp sensors */

        u8 bank1_sensors[2];

        u8 bank1_address[2][ABIT_UGURU_MAX_BANK1_SENSORS];

        u8 bank1_value[ABIT_UGURU_MAX_BANK1_SENSORS];

        /* This array holds 3 entries per sensor for the bank 1 sensor settings

           (flags, min, max for voltage / flags, warn, shutdown for temp). */

        u8 bank1_settings[ABIT_UGURU_MAX_BANK1_SENSORS][3];

        /* Maximum value for each sensor used for scaling in mV/millidegrees

           Celsius. */

        int bank1_max_value[ABIT_UGURU_MAX_BANK1_SENSORS];

        /* Bank 2 data, ABIT_UGURU_MAX_BANK2_SENSORS entries for bank2 */

        u8 bank2_sensors; /* actual number of bank2 sensors found */

        u8 bank2_value[ABIT_UGURU_MAX_BANK2_SENSORS];

        u8 bank2_settings[ABIT_UGURU_MAX_BANK2_SENSORS][2]; /* flags, min */

        /* Alarms 2 bytes for bank1, 1 byte for bank2 */

        u8 alarms[3];

        /* Fan PWM (speed control) 5 bytes per PWM */

        u8 pwms; /* actual number of pwms found */

        u8 pwm_settings[ABIT_UGURU_MAX_PWMS][5];

};

/* wait till the uguru is in the specified state */

static int abituguru_wait(struct abituguru_data *data, u8 state)

{

        int timeout = ABIT_UGURU_WAIT_TIMEOUT;

        while (inb_p(data->addr + ABIT_UGURU_DATA) != state) {

                timeout--;

                if (timeout == 0)

                        return -EBUSY;

                /* sleep a bit before our last few tries, see the comment on

                   this where ABIT_UGURU_WAIT_TIMEOUT_SLEEP is defined. */

                if (timeout <= ABIT_UGURU_WAIT_TIMEOUT_SLEEP)

                        msleep(0);

        }

        return 0;

}

/* Put the uguru in ready for input state */

static int abituguru_ready(struct abituguru_data *data)

{

        int timeout = ABIT_UGURU_READY_TIMEOUT;

        if (data->uguru_ready)

                return 0;

        /* Reset? / Prepare for next read/write cycle */

        outb(0x00, data->addr + ABIT_UGURU_DATA);

        /* Wait till the uguru is ready */

        if (abituguru_wait(data, ABIT_UGURU_STATUS_READY)) {

                ABIT_UGURU_DEBUG(1,

                        "timeout exceeded waiting for ready state\n");

                return -EIO;

        }

        /* Cmd port MUST be read now and should contain 0xAC */

        while (inb_p(data->addr + ABIT_UGURU_CMD) != 0xAC) {

                timeout--;

                if (timeout == 0) {

                        ABIT_UGURU_DEBUG(1,

                           "CMD reg does not hold 0xAC after ready command\n");

                        return -EIO;

                }

                msleep(0);

        }

        /* After this the ABIT_UGURU_DATA port should contain

           ABIT_UGURU_STATUS_INPUT */

        timeout = ABIT_UGURU_READY_TIMEOUT;

        while (inb_p(data->addr + ABIT_UGURU_DATA) != ABIT_UGURU_STATUS_INPUT) {

                timeout--;

                if (timeout == 0) {

                        ABIT_UGURU_DEBUG(1,

                                "state != more input after ready command\n");

                        return -EIO;

                }

                msleep(0);

        }

        data->uguru_ready = 1;

        return 0;

}

/* Send the bank and then sensor address to the uGuru for the next read/write

   cycle. This function gets called as the first part of a read/write by

   abituguru_read and abituguru_write. This function should never be

   called by any other function. */

static int abituguru_send_address(struct abituguru_data *data,

        u8 bank_addr, u8 sensor_addr, int retries)

{

        /* assume the caller does error handling itself if it has not requested

           any retries, and thus be quiet. */

        int report_errors = retries;

        for (;;) {

                /* Make sure the uguru is ready and then send the bank address,

                   after this the uguru is no longer "ready". */

                if (abituguru_ready(data) != 0)

                        return -EIO;

                outb(bank_addr, data->addr + ABIT_UGURU_DATA);

                data->uguru_ready = 0;

                /* Wait till the uguru is ABIT_UGURU_STATUS_INPUT state again

                   and send the sensor addr */

                if (abituguru_wait(data, ABIT_UGURU_STATUS_INPUT)) {

                        if (retries) {

                                ABIT_UGURU_DEBUG(3, "timeout exceeded "

                                        "waiting for more input state, %d "

                                        "tries remaining\n", retries);

                                set_current_state(TASK_UNINTERRUPTIBLE);

                                schedule_timeout(ABIT_UGURU_RETRY_DELAY);

                                retries--;

                                continue;

                        }

                        if (report_errors)

                                ABIT_UGURU_DEBUG(1, "timeout exceeded "

                                        "waiting for more input state "

                                        "(bank: %d)\n", (int)bank_addr);

                        return -EBUSY;

                }

                outb(sensor_addr, data->addr + ABIT_UGURU_CMD);

                return 0;

        }

}

/* Read count bytes from sensor sensor_addr in bank bank_addr and store the

   result in buf, retry the send address part of the read retries times. */

static int abituguru_read(struct abituguru_data *data,

        u8 bank_addr, u8 sensor_addr, u8 *buf, int count, int retries)

{

        int i;

        /* Send the address */

        i = abituguru_send_address(data, bank_addr, sensor_addr, retries);

        if (i)

                return i;

        /* And read the data */

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

                if (abituguru_wait(data, ABIT_UGURU_STATUS_READ)) {

                        ABIT_UGURU_DEBUG(retries ? 1 : 3,

                                "timeout exceeded waiting for "

                                "read state (bank: %d, sensor: %d)\n",

                                (int)bank_addr, (int)sensor_addr);

                        break;

                }

                buf[i] = inb(data->addr + ABIT_UGURU_CMD);

        }

        /* Last put the chip back in ready state */

        abituguru_ready(data);

        return i;

}

/* Write count bytes from buf to sensor sensor_addr in bank bank_addr, the send

   address part of the write is always retried ABIT_UGURU_MAX_RETRIES times. */

static int abituguru_write(struct abituguru_data *data,

        u8 bank_addr, u8 sensor_addr, u8 *buf, int count)

{

        /* We use the ready timeout as we have to wait for 0xAC just like the

           ready function */

        int i, timeout = ABIT_UGURU_READY_TIMEOUT;

        /* Send the address */

        i = abituguru_send_address(data, bank_addr, sensor_addr,

                ABIT_UGURU_MAX_RETRIES);

        if (i)

                return i;

        /* And write the data */

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

                if (abituguru_wait(data, ABIT_UGURU_STATUS_WRITE)) {

                        ABIT_UGURU_DEBUG(1, "timeout exceeded waiting for "

                                "write state (bank: %d, sensor: %d)\n",

                                (int)bank_addr, (int)sensor_addr);

                        break;

                }

                outb(buf[i], data->addr + ABIT_UGURU_CMD);

        }

        /* Now we need to wait till the chip is ready to be read again,

           so that we can read 0xAC as confirmation that our write has

           succeeded. */

        if (abituguru_wait(data, ABIT_UGURU_STATUS_READ)) {

                ABIT_UGURU_DEBUG(1, "timeout exceeded waiting for read state "

                        "after write (bank: %d, sensor: %d)\n", (int)bank_addr,

                        (int)sensor_addr);

                return -EIO;

        }

        /* Cmd port MUST be read now and should contain 0xAC */

        while (inb_p(data->addr + ABIT_UGURU_CMD) != 0xAC) {

                timeout--;

                if (timeout == 0) {

                        ABIT_UGURU_DEBUG(1, "CMD reg does not hold 0xAC after "

                                "write (bank: %d, sensor: %d)\n",

                                (int)bank_addr, (int)sensor_addr);

                        return -EIO;

                }

                msleep(0);

        }

        /* Last put the chip back in ready state */

        abituguru_ready(data);

        return i;

}

/* Detect sensor type. Temp and Volt sensors are enabled with

   different masks and will ignore enable masks not meant for them.

   This enables us to test what kind of sensor we're dealing with.

   By setting the alarm thresholds so that we will always get an

   alarm for sensor type X and then enabling the sensor as sensor type

   X, if we then get an alarm it is a sensor of type X. */

static int __devinit

abituguru_detect_bank1_sensor_type(struct abituguru_data *data,

                                   u8 sensor_addr)

{

        u8 val, test_flag, buf[3];

        int i, ret = -ENODEV; /* error is the most common used retval :| */

        /* If overriden by the user return the user selected type */

        if (bank1_types[sensor_addr] >= ABIT_UGURU_IN_SENSOR &&

                        bank1_types[sensor_addr] <= ABIT_UGURU_NC) {

                ABIT_UGURU_DEBUG(2, "assuming sensor type %d for bank1 sensor "

                        "%d because of \"bank1_types\" module param\n",

                        bank1_types[sensor_addr], (int)sensor_addr);

                return bank1_types[sensor_addr];

        }

        /* First read the sensor and the current settings */

        if (abituguru_read(data, ABIT_UGURU_SENSOR_BANK1, sensor_addr, &val,

                        1, ABIT_UGURU_MAX_RETRIES) != 1)

                return -ENODEV;

        /* Test val is sane / usable for sensor type detection. */

        if ((val < 10u) || (val > 250u)) {

                printk(KERN_WARNING ABIT_UGURU_NAME

                        ": bank1-sensor: %d reading (%d) too close to limits, "

                        "unable to determine sensor type, skipping sensor\n",

                        (int)sensor_addr, (int)val);

                /* assume no sensor is there for sensors for which we can't

                   determine the sensor type because their reading is too close

                   to their limits, this usually means no sensor is there. */

                return ABIT_UGURU_NC;

        }

        ABIT_UGURU_DEBUG(2, "testing bank1 sensor %d\n", (int)sensor_addr);

        /* Volt sensor test, enable volt low alarm, set min value ridicously

           high, or vica versa if the reading is very high. If its a volt

           sensor this should always give us an alarm. */

        if (val <= 240u) {

                buf[0] = ABIT_UGURU_VOLT_LOW_ALARM_ENABLE;

                buf[1] = 245;

                buf[2] = 250;

                test_flag = ABIT_UGURU_VOLT_LOW_ALARM_FLAG;

        } else {

                buf[0] = ABIT_UGURU_VOLT_HIGH_ALARM_ENABLE;

                buf[1] = 5;

                buf[2] = 10;

                test_flag = ABIT_UGURU_VOLT_HIGH_ALARM_FLAG;

        }

        if (abituguru_write(data, ABIT_UGURU_SENSOR_BANK1 + 2, sensor_addr,

                        buf, 3) != 3)

                goto abituguru_detect_bank1_sensor_type_exit;

        /* Now we need 20 ms to give the uguru time to read the sensors

           and raise a voltage alarm */

        set_current_state(TASK_UNINTERRUPTIBLE);

        schedule_timeout(HZ/50);

        /* Check for alarm and check the alarm is a volt low alarm. */

        if (abituguru_read(data, ABIT_UGURU_ALARM_BANK, 0, buf, 3,

                        ABIT_UGURU_MAX_RETRIES) != 3)

                goto abituguru_detect_bank1_sensor_type_exit;

        if (buf[sensor_addr/8] & (0x01 << (sensor_addr % 8))) {

                if (abituguru_read(data, ABIT_UGURU_SENSOR_BANK1 + 1,

                                sensor_addr, buf, 3,

                                ABIT_UGURU_MAX_RETRIES) != 3)

                        goto abituguru_detect_bank1_sensor_type_exit;

                if (buf[0] & test_flag) {

                        ABIT_UGURU_DEBUG(2, "  found volt sensor\n");

                        ret = ABIT_UGURU_IN_SENSOR;

                        goto abituguru_detect_bank1_sensor_type_exit;

                } else

                        ABIT_UGURU_DEBUG(2, "  alarm raised during volt "

                                "sensor test, but volt range flag not set\n");

        } else

                ABIT_UGURU_DEBUG(2, "  alarm not raised during volt sensor "

                        "test\n");

        /* Temp sensor test, enable sensor as a temp sensor, set beep value

           ridicously low (but not too low, otherwise uguru ignores it).

           If its a temp sensor this should always give us an alarm. */

        buf[0] = ABIT_UGURU_TEMP_HIGH_ALARM_ENABLE;

        buf[1] = 5;

        buf[2] = 10;

        if (abituguru_write(data, ABIT_UGURU_SENSOR_BANK1 + 2, sensor_addr,

                        buf, 3) != 3)

                goto abituguru_detect_bank1_sensor_type_exit;

        /* Now we need 50 ms to give the uguru time to read the sensors

           and raise a temp alarm */

        set_current_state(TASK_UNINTERRUPTIBLE);

        schedule_timeout(HZ/20);

        /* Check for alarm and check the alarm is a temp high alarm. */

        if (abituguru_read(data, ABIT_UGURU_ALARM_BANK, 0, buf, 3,

                        ABIT_UGURU_MAX_RETRIES) != 3)

                goto abituguru_detect_bank1_sensor_type_exit;

        if (buf[sensor_addr/8] & (0x01 << (sensor_addr % 8))) {

                if (abituguru_read(data, ABIT_UGURU_SENSOR_BANK1 + 1,

                                sensor_addr, buf, 3,

                                ABIT_UGURU_MAX_RETRIES) != 3)

                        goto abituguru_detect_bank1_sensor_type_exit;

                if (buf[0] & ABIT_UGURU_TEMP_HIGH_ALARM_FLAG) {

                        ABIT_UGURU_DEBUG(2, "  found temp sensor\n");

                        ret = ABIT_UGURU_TEMP_SENSOR;

                        goto abituguru_detect_bank1_sensor_type_exit;

                } else

                        ABIT_UGURU_DEBUG(2, "  alarm raised during temp "

                                "sensor test, but temp high flag not set\n");

        } else

                ABIT_UGURU_DEBUG(2, "  alarm not raised during temp sensor "

                        "test\n");

        ret = ABIT_UGURU_NC;

abituguru_detect_bank1_sensor_type_exit:

        /* Restore original settings, failing here is really BAD, it has been

           reported that some BIOS-es hang when entering the uGuru menu with

           invalid settings present in the uGuru, so we try this 3 times. */

        for (i = 0; i < 3; i++)

                if (abituguru_write(data, ABIT_UGURU_SENSOR_BANK1 + 2,

                                sensor_addr, data->bank1_settings[sensor_addr],

                                3) == 3)

                        break;

        if (i == 3) {

                printk(KERN_ERR ABIT_UGURU_NAME

                        ": Fatal error could not restore original settings. "

                        "This should never happen please report this to the "

                        "abituguru maintainer (see MAINTAINERS)\n");

                return -ENODEV;

        }

        return ret;

}

/* These functions try to find out how many sensors there are in bank2 and how

   many pwms there are. The purpose of this is to make sure that we don't give

   the user the possibility to change settings for non-existent sensors / pwm.

   The uGuru will happily read / write whatever memory happens to be after the

   memory storing the PWM settings when reading/writing to a PWM which is not

   there. Notice even if we detect a PWM which doesn't exist we normally won't

   write to it, unless the user tries to change the settings.

   Although the uGuru allows reading (settings) from non existing bank2

   sensors, my version of the uGuru does seem to stop writing to them, the

   write function above aborts in this case with:

   "CMD reg does not hold 0xAC after write"

   Notice these 2 tests are non destructive iow read-only tests, otherwise

   they would defeat their purpose. Although for the bank2_sensors detection a

   read/write test would be feasible because of the reaction above, I've

   however opted to stay on the safe side. */

static void __devinit

abituguru_detect_no_bank2_sensors(struct abituguru_data *data)

{

        int i;

        if (fan_sensors > 0 && fan_sensors <= ABIT_UGURU_MAX_BANK2_SENSORS) {

                data->bank2_sensors = fan_sensors;

                ABIT_UGURU_DEBUG(2, "assuming %d fan sensors because of "

                        "\"fan_sensors\" module param\n",

                        (int)data->bank2_sensors);

                return;

        }

        ABIT_UGURU_DEBUG(2, "detecting number of fan sensors\n");

        for (i = 0; i < ABIT_UGURU_MAX_BANK2_SENSORS; i++) {

                /* 0x89 are the known used bits:

                   -0x80 enable shutdown

                   -0x08 enable beep

                   -0x01 enable alarm

                   All other bits should be 0, but on some motherboards

                   0x40 (bit 6) is also high for some of the fans?? */

                if (data->bank2_settings[i][0] & ~0xC9) {

                        ABIT_UGURU_DEBUG(2, "  bank2 sensor %d does not seem "

                                "to be a fan sensor: settings[0] = %02X\n",

                                i, (unsigned int)data->bank2_settings[i][0]);

                        break;

                }

                /* check if the threshold is within the allowed range */

                if (data->bank2_settings[i][1] <

                                abituguru_bank2_min_threshold) {

                        ABIT_UGURU_DEBUG(2, "  bank2 sensor %d does not seem "

                                "to be a fan sensor: the threshold (%d) is "

                                "below the minimum (%d)\n", i,

                                (int)data->bank2_settings[i][1],

                                (int)abituguru_bank2_min_threshold);

                        break;

                }

                if (data->bank2_settings[i][1] >

                                abituguru_bank2_max_threshold) {

                        ABIT_UGURU_DEBUG(2, "  bank2 sensor %d does not seem "

                                "to be a fan sensor: the threshold (%d) is "

                                "above the maximum (%d)\n", i,

                                (int)data->bank2_settings[i][1],

                                (int)abituguru_bank2_max_threshold);

                        break;

                }

        }

        data->bank2_sensors = i;

        ABIT_UGURU_DEBUG(2, " found: %d fan sensors\n",

                (int)data->bank2_sensors);

}

static void __devinit

abituguru_detect_no_pwms(struct abituguru_data *data)

{

        int i, j;

        if (pwms > 0 && pwms <= ABIT_UGURU_MAX_PWMS) {

                data->pwms = pwms;

                ABIT_UGURU_DEBUG(2, "assuming %d PWM outputs because of "

                        "\"pwms\" module param\n", (int)data->pwms);

                return;

        }

        ABIT_UGURU_DEBUG(2, "detecting number of PWM outputs\n");

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

                /* 0x80 is the enable bit and the low

                   nibble is which temp sensor to use,

                   the other bits should be 0 */

                if (data->pwm_settings[i][0] & ~0x8F) {

                        ABIT_UGURU_DEBUG(2, "  pwm channel %d does not seem "

                                "to be a pwm channel: settings[0] = %02X\n",

                                i, (unsigned int)data->pwm_settings[i][0]);

                        break;

                }

                /* the low nibble must correspond to one of the temp sensors

                   we've found */

                for (j = 0; j < data->bank1_sensors[ABIT_UGURU_TEMP_SENSOR];

                                j++) {

                        if (data->bank1_address[ABIT_UGURU_TEMP_SENSOR][j] ==

                                        (data->pwm_settings[i][0] & 0x0F))

                                break;

                }

                if (j == data->bank1_sensors[ABIT_UGURU_TEMP_SENSOR]) {

                        ABIT_UGURU_DEBUG(2, "  pwm channel %d does not seem "

                                "to be a pwm channel: %d is not a valid temp "

                                "sensor address\n", i,

                                data->pwm_settings[i][0] & 0x0F);

                        break;

                }

                /* check if all other settings are within the allowed range */

                for (j = 1; j < 5; j++) {

                        u8 min;

                        /* special case pwm1 min pwm% */

                        if ((i == 0) && ((j == 1) || (j == 2)))

                                min = 77;

                        else

                                min = abituguru_pwm_min[j];

                        if (data->pwm_settings[i][j] < min) {

                                ABIT_UGURU_DEBUG(2, "  pwm channel %d does "

                                        "not seem to be a pwm channel: "

                                        "setting %d (%d) is below the minimum "

                                        "value (%d)\n", i, j,

                                        (int)data->pwm_settings[i][j],

                                        (int)min);

                                goto abituguru_detect_no_pwms_exit;

                        }

                        if (data->pwm_settings[i][j] > abituguru_pwm_max[j]) {