i8k.c

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/*
 * i8k.c -- Linux driver for accessing the SMM BIOS on Dell laptops.
 *      See http://www.debian.org/~dz/i8k/ for more information
 *      and for latest version of this driver.
 *
 * Copyright (C) 2001  Massimo Dal Zotto <[email protected]>
 *
 * Hwmon integration:
 * Copyright (C) 2011  Jean Delvare <[email protected]>
 *
 * 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, 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.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/dmi.h>
#include <linux/capability.h>
#include <linux/mutex.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <asm/uaccess.h>
#include <asm/io.h>

#include <linux/i8k.h>

#define I8K_VERSION     "1.14 21/02/2005"

#define I8K_SMM_FN_STATUS   0x0025
#define I8K_SMM_POWER_STATUS    0x0069
#define I8K_SMM_SET_FAN     0x01a3
#define I8K_SMM_GET_FAN     0x00a3
#define I8K_SMM_GET_SPEED   0x02a3
#define I8K_SMM_GET_TEMP    0x10a3
#define I8K_SMM_GET_DELL_SIG1   0xfea3
#define I8K_SMM_GET_DELL_SIG2   0xffa3
#define I8K_SMM_BIOS_VERSION    0x00a6

#define I8K_FAN_MULT        30
#define I8K_MAX_TEMP        127

#define I8K_FN_NONE     0x00
#define I8K_FN_UP       0x01
#define I8K_FN_DOWN     0x02
#define I8K_FN_MUTE     0x04
#define I8K_FN_MASK     0x07
#define I8K_FN_SHIFT        8

#define I8K_POWER_AC        0x05
#define I8K_POWER_BATTERY   0x01

#define I8K_TEMPERATURE_BUG 1

static DEFINE_MUTEX(i8k_mutex);
static char bios_version[4];
static struct device *i8k_hwmon_dev;

MODULE_AUTHOR("Massimo Dal Zotto ([email protected])");
MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
MODULE_LICENSE("GPL");

static bool force;
module_param(force, bool, 0);
MODULE_PARM_DESC(force, "Force loading without checking for supported models");

static bool ignore_dmi;
module_param(ignore_dmi, bool, 0);
MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");

static bool restricted;
module_param(restricted, bool, 0);
MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");

static bool power_status;
module_param(power_status, bool, 0600);
MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");

static int fan_mult = I8K_FAN_MULT;
module_param(fan_mult, int, 0);
MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with");

static int i8k_open_fs(struct inode *inode, struct file *file);
static long i8k_ioctl(struct file *, unsigned int, unsigned long);

static const struct file_operations i8k_fops = {
    .owner      = THIS_MODULE,
    .open       = i8k_open_fs,
    .read       = seq_read,
    .llseek     = seq_lseek,
    .release    = single_release,
    .unlocked_ioctl = i8k_ioctl,
};

struct smm_regs {
    unsigned int eax;
    unsigned int ebx __attribute__ ((packed));
    unsigned int ecx __attribute__ ((packed));
    unsigned int edx __attribute__ ((packed));
    unsigned int esi __attribute__ ((packed));
    unsigned int edi __attribute__ ((packed));
};

static inline const char *i8k_get_dmi_data(int field)
{
    const char *dmi_data = dmi_get_system_info(field);

    return dmi_data && *dmi_data ? dmi_data : "?";
}

/*
 * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
 */
static int i8k_smm(struct smm_regs *regs)
{
    int rc;
    int eax = regs->eax;

#if defined(CONFIG_X86_64)
    asm volatile("pushq %%rax\n\t"
        "movl 0(%%rax),%%edx\n\t"
        "pushq %%rdx\n\t"
        "movl 4(%%rax),%%ebx\n\t"
        "movl 8(%%rax),%%ecx\n\t"
        "movl 12(%%rax),%%edx\n\t"
        "movl 16(%%rax),%%esi\n\t"
        "movl 20(%%rax),%%edi\n\t"
        "popq %%rax\n\t"
        "out %%al,$0xb2\n\t"
        "out %%al,$0x84\n\t"
        "xchgq %%rax,(%%rsp)\n\t"
        "movl %%ebx,4(%%rax)\n\t"
        "movl %%ecx,8(%%rax)\n\t"
        "movl %%edx,12(%%rax)\n\t"
        "movl %%esi,16(%%rax)\n\t"
        "movl %%edi,20(%%rax)\n\t"
        "popq %%rdx\n\t"
        "movl %%edx,0(%%rax)\n\t"
        "pushfq\n\t"
        "popq %%rax\n\t"
        "andl $1,%%eax\n"
        :"=a"(rc)
        :    "a"(regs)
        :    "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
#else
    asm volatile("pushl %%eax\n\t"
        "movl 0(%%eax),%%edx\n\t"
        "push %%edx\n\t"
        "movl 4(%%eax),%%ebx\n\t"
        "movl 8(%%eax),%%ecx\n\t"
        "movl 12(%%eax),%%edx\n\t"
        "movl 16(%%eax),%%esi\n\t"
        "movl 20(%%eax),%%edi\n\t"
        "popl %%eax\n\t"
        "out %%al,$0xb2\n\t"
        "out %%al,$0x84\n\t"
        "xchgl %%eax,(%%esp)\n\t"
        "movl %%ebx,4(%%eax)\n\t"
        "movl %%ecx,8(%%eax)\n\t"
        "movl %%edx,12(%%eax)\n\t"
        "movl %%esi,16(%%eax)\n\t"
        "movl %%edi,20(%%eax)\n\t"
        "popl %%edx\n\t"
        "movl %%edx,0(%%eax)\n\t"
        "lahf\n\t"
        "shrl $8,%%eax\n\t"
        "andl $1,%%eax\n"
        :"=a"(rc)
        :    "a"(regs)
        :    "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
#endif
    if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
        return -EINVAL;

    return 0;
}

/*
 * Read the bios version. Return the version as an integer corresponding
 * to the ascii value, for example "A17" is returned as 0x00413137.
 */
static int i8k_get_bios_version(void)
{
    struct smm_regs regs = { .eax = I8K_SMM_BIOS_VERSION, };

    return i8k_smm(&regs) ? : regs.eax;
}

/*
 * Read the Fn key status.
 */
static int i8k_get_fn_status(void)
{
    struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
    int rc;

    if ((rc = i8k_smm(&regs)) < 0)
        return rc;

    switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
    case I8K_FN_UP:
        return I8K_VOL_UP;
    case I8K_FN_DOWN:
        return I8K_VOL_DOWN;
    case I8K_FN_MUTE:
        return I8K_VOL_MUTE;
    default:
        return 0;
    }
}

/*
 * Read the power status.
 */
static int i8k_get_power_status(void)
{
    struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
    int rc;

    if ((rc = i8k_smm(&regs)) < 0)
        return rc;

    return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
}

/*
 * Read the fan status.
 */
static int i8k_get_fan_status(int fan)
{
    struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };

    regs.ebx = fan & 0xff;
    return i8k_smm(&regs) ? : regs.eax & 0xff;
}

/*
 * Read the fan speed in RPM.
 */
static int i8k_get_fan_speed(int fan)
{
    struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };

    regs.ebx = fan & 0xff;
    return i8k_smm(&regs) ? : (regs.eax & 0xffff) * fan_mult;
}

/*
 * Set the fan speed (off, low, high). Returns the new fan status.
 */
static int i8k_set_fan(int fan, int speed)
{
    struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };

    speed = (speed < 0) ? 0 : ((speed > I8K_FAN_MAX) ? I8K_FAN_MAX : speed);
    regs.ebx = (fan & 0xff) | (speed << 8);

    return i8k_smm(&regs) ? : i8k_get_fan_status(fan);
}

/*
 * Read the cpu temperature.
 */
static int i8k_get_temp(int sensor)
{
    struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP, };
    int rc;
    int temp;

#ifdef I8K_TEMPERATURE_BUG
    static int prev;
#endif
    regs.ebx = sensor & 0xff;
    if ((rc = i8k_smm(&regs)) < 0)
        return rc;

    temp = regs.eax & 0xff;

#ifdef I8K_TEMPERATURE_BUG
    /*
     * Sometimes the temperature sensor returns 0x99, which is out of range.
     * In this case we return (once) the previous cached value. For example:
     # 1003655137 00000058 00005a4b
     # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
     # 1003655139 00000054 00005c52
     */
    if (temp > I8K_MAX_TEMP) {
        temp = prev;
        prev = I8K_MAX_TEMP;
    } else {
        prev = temp;
    }
#endif

    return temp;
}

static int i8k_get_dell_signature(int req_fn)
{
    struct smm_regs regs = { .eax = req_fn, };
    int rc;

    if ((rc = i8k_smm(&regs)) < 0)
        return rc;

    return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
}

static int
i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
{
    int val = 0;
    int speed;
    unsigned char buff[16];
    int __user *argp = (int __user *)arg;

    if (!argp)
        return -EINVAL;

    switch (cmd) {
    case I8K_BIOS_VERSION:
        val = i8k_get_bios_version();
        break;

    case I8K_MACHINE_ID:
        memset(buff, 0, 16);
        strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL), sizeof(buff));
        break;

    case I8K_FN_STATUS:
        val = i8k_get_fn_status();
        break;

    case I8K_POWER_STATUS:
        val = i8k_get_power_status();
        break;

    case I8K_GET_TEMP:
        val = i8k_get_temp(0);
        break;

    case I8K_GET_SPEED:
        if (copy_from_user(&val, argp, sizeof(int)))
            return -EFAULT;

        val = i8k_get_fan_speed(val);
        break;

    case I8K_GET_FAN:
        if (copy_from_user(&val, argp, sizeof(int)))
            return -EFAULT;

        val = i8k_get_fan_status(val);
        break;

    case I8K_SET_FAN:
        if (restricted && !capable(CAP_SYS_ADMIN))
            return -EPERM;

        if (copy_from_user(&val, argp, sizeof(int)))
            return -EFAULT;

        if (copy_from_user(&speed, argp + 1, sizeof(int)))
            return -EFAULT;

        val = i8k_set_fan(val, speed);
        break;

    default:
        return -EINVAL;
    }

    if (val < 0)
        return val;

    switch (cmd) {
    case I8K_BIOS_VERSION:
        if (copy_to_user(argp, &val, 4))
            return -EFAULT;

        break;
    case I8K_MACHINE_ID:
        if (copy_to_user(argp, buff, 16))
            return -EFAULT;

        break;
    default:
        if (copy_to_user(argp, &val, sizeof(int)))
            return -EFAULT;

        break;
    }

    return 0;
}

static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
{
    long ret;

    mutex_lock(&i8k_mutex);
    ret = i8k_ioctl_unlocked(fp, cmd, arg);
    mutex_unlock(&i8k_mutex);

    return ret;
}

/*
 * Print the information for /proc/i8k.
 */
static int i8k_proc_show(struct seq_file *seq, void *offset)
{
    int fn_key, cpu_temp, ac_power;
    int left_fan, right_fan, left_speed, right_speed;

    cpu_temp    = i8k_get_temp(0);          /* 11100 µs */
    left_fan    = i8k_get_fan_status(I8K_FAN_LEFT); /*   580 µs */
    right_fan   = i8k_get_fan_status(I8K_FAN_RIGHT);    /*   580 µs */
    left_speed  = i8k_get_fan_speed(I8K_FAN_LEFT);  /*   580 µs */
    right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /*   580 µs */
    fn_key      = i8k_get_fn_status();          /*   750 µs */
    if (power_status)
        ac_power = i8k_get_power_status();      /* 14700 µs */
    else
        ac_power = -1;

    /*
     * Info:
     *
     * 1)  Format version (this will change if format changes)
     * 2)  BIOS version
     * 3)  BIOS machine ID
     * 4)  Cpu temperature
     * 5)  Left fan status
     * 6)  Right fan status
     * 7)  Left fan speed
     * 8)  Right fan speed
     * 9)  AC power
     * 10) Fn Key status
     */
    return seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
              I8K_PROC_FMT,
              bios_version,
              i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
              cpu_temp,
              left_fan, right_fan, left_speed, right_speed,
              ac_power, fn_key);
}

static int i8k_open_fs(struct inode *inode, struct file *file)
{
    return single_open(file, i8k_proc_show, NULL);
}


/*
 * Hwmon interface
 */

static ssize_t i8k_hwmon_show_temp(struct device *dev,
                   struct device_attribute *devattr,
                   char *buf)
{
    int cpu_temp;

    cpu_temp = i8k_get_temp(0);
    if (cpu_temp < 0)
        return cpu_temp;
    return sprintf(buf, "%d\n", cpu_temp * 1000);
}

static ssize_t i8k_hwmon_show_fan(struct device *dev,
                  struct device_attribute *devattr,
                  char *buf)
{
    int index = to_sensor_dev_attr(devattr)->index;
    int fan_speed;

    fan_speed = i8k_get_fan_speed(index);
    if (fan_speed < 0)
        return fan_speed;
    return sprintf(buf, "%d\n", fan_speed);
}

static ssize_t i8k_hwmon_show_label(struct device *dev,
                    struct device_attribute *devattr,
                    char *buf)
{
    static const char *labels[4] = {
        "i8k",
        "CPU",
        "Left Fan",
        "Right Fan",
    };
    int index = to_sensor_dev_attr(devattr)->index;

    return sprintf(buf, "%s\n", labels[index]);
}

static DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL);
static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
              I8K_FAN_LEFT);
static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
              I8K_FAN_RIGHT);
static SENSOR_DEVICE_ATTR(name, S_IRUGO, i8k_hwmon_show_label, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, i8k_hwmon_show_label, NULL, 1);
static SENSOR_DEVICE_ATTR(fan1_label, S_IRUGO, i8k_hwmon_show_label, NULL, 2);
static SENSOR_DEVICE_ATTR(fan2_label, S_IRUGO, i8k_hwmon_show_label, NULL, 3);

static void i8k_hwmon_remove_files(struct device *dev)
{
    device_remove_file(dev, &dev_attr_temp1_input);
    device_remove_file(dev, &sensor_dev_attr_fan1_input.dev_attr);
    device_remove_file(dev, &sensor_dev_attr_fan2_input.dev_attr);
    device_remove_file(dev, &sensor_dev_attr_temp1_label.dev_attr);
    device_remove_file(dev, &sensor_dev_attr_fan1_label.dev_attr);
    device_remove_file(dev, &sensor_dev_attr_fan2_label.dev_attr);
    device_remove_file(dev, &sensor_dev_attr_name.dev_attr);
}

static int __init i8k_init_hwmon(void)
{
    int err;

    i8k_hwmon_dev = hwmon_device_register(NULL);
    if (IS_ERR(i8k_hwmon_dev)) {
        err = PTR_ERR(i8k_hwmon_dev);
        i8k_hwmon_dev = NULL;
        printk(KERN_ERR "i8k: hwmon registration failed (%d)\n", err);
        return err;
    }

    /* Required name attribute */
    err = device_create_file(i8k_hwmon_dev,
                 &sensor_dev_attr_name.dev_attr);
    if (err)
        goto exit_unregister;

    /* CPU temperature attributes, if temperature reading is OK */
    err = i8k_get_temp(0);
    if (err < 0) {
        dev_dbg(i8k_hwmon_dev,
            "Not creating temperature attributes (%d)\n", err);
    } else {
        err = device_create_file(i8k_hwmon_dev, &dev_attr_temp1_input);
        if (err)
            goto exit_remove_files;
        err = device_create_file(i8k_hwmon_dev,
                     &sensor_dev_attr_temp1_label.dev_attr);
        if (err)
            goto exit_remove_files;
    }

    /* Left fan attributes, if left fan is present */
    err = i8k_get_fan_status(I8K_FAN_LEFT);
    if (err < 0) {
        dev_dbg(i8k_hwmon_dev,
            "Not creating %s fan attributes (%d)\n", "left", err);
    } else {
        err = device_create_file(i8k_hwmon_dev,
                     &sensor_dev_attr_fan1_input.dev_attr);
        if (err)
            goto exit_remove_files;
        err = device_create_file(i8k_hwmon_dev,
                     &sensor_dev_attr_fan1_label.dev_attr);
        if (err)
            goto exit_remove_files;
    }

    /* Right fan attributes, if right fan is present */
    err = i8k_get_fan_status(I8K_FAN_RIGHT);
    if (err < 0) {
        dev_dbg(i8k_hwmon_dev,
            "Not creating %s fan attributes (%d)\n", "right", err);
    } else {
        err = device_create_file(i8k_hwmon_dev,
                     &sensor_dev_attr_fan2_input.dev_attr);
        if (err)
            goto exit_remove_files;
        err = device_create_file(i8k_hwmon_dev,
                     &sensor_dev_attr_fan2_label.dev_attr);
        if (err)
            goto exit_remove_files;
    }

    return 0;

 exit_remove_files:
    i8k_hwmon_remove_files(i8k_hwmon_dev);
 exit_unregister:
    hwmon_device_unregister(i8k_hwmon_dev);
    return err;
}

static void __exit i8k_exit_hwmon(void)
{
    i8k_hwmon_remove_files(i8k_hwmon_dev);
    hwmon_device_unregister(i8k_hwmon_dev);
}

static struct dmi_system_id __initdata i8k_dmi_table[] = {
    {
        .ident = "Dell Inspiron",
        .matches = {
            DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
            DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
        },
    },
    {
        .ident = "Dell Latitude",
        .matches = {
            DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
            DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
        },
    },
    {
        .ident = "Dell Inspiron 2",
        .matches = {
            DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
            DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
        },
    },
    {
        .ident = "Dell Latitude 2",
        .matches = {
            DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
            DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
        },
    },
    {   /* UK Inspiron 6400  */
        .ident = "Dell Inspiron 3",
        .matches = {
            DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
            DMI_MATCH(DMI_PRODUCT_NAME, "MM061"),
        },
    },
    {
        .ident = "Dell Inspiron 3",
        .matches = {
            DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
            DMI_MATCH(DMI_PRODUCT_NAME, "MP061"),
        },
    },
    {
        .ident = "Dell Precision",
        .matches = {
            DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
            DMI_MATCH(DMI_PRODUCT_NAME, "Precision"),
        },
    },
    {
        .ident = "Dell Vostro",
        .matches = {
            DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
            DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"),
        },
    },
        { }
};

/*
 * Probe for the presence of a supported laptop.
 */
static int __init i8k_probe(void)
{
    char buff[4];
    int version;

    /*
     * Get DMI information
     */
    if (!dmi_check_system(i8k_dmi_table)) {
        if (!ignore_dmi && !force)
            return -ENODEV;

        printk(KERN_INFO "i8k: not running on a supported Dell system.\n");
        printk(KERN_INFO "i8k: vendor=%s, model=%s, version=%s\n",
            i8k_get_dmi_data(DMI_SYS_VENDOR),
            i8k_get_dmi_data(DMI_PRODUCT_NAME),
            i8k_get_dmi_data(DMI_BIOS_VERSION));
    }

    strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION), sizeof(bios_version));

    /*
     * Get SMM Dell signature
     */
    if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
        i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
        printk(KERN_ERR "i8k: unable to get SMM Dell signature\n");
        if (!force)
            return -ENODEV;
    }

    /*
     * Get SMM BIOS version.
     */
    version = i8k_get_bios_version();
    if (version <= 0) {
        printk(KERN_WARNING "i8k: unable to get SMM BIOS version\n");
    } else {
        buff[0] = (version >> 16) & 0xff;
        buff[1] = (version >> 8) & 0xff;
        buff[2] = (version) & 0xff;
        buff[3] = '\0';
        /*
         * If DMI BIOS version is unknown use SMM BIOS version.
         */
        if (!dmi_get_system_info(DMI_BIOS_VERSION))
            strlcpy(bios_version, buff, sizeof(bios_version));

        /*
         * Check if the two versions match.
         */
        if (strncmp(buff, bios_version, sizeof(bios_version)) != 0)
            printk(KERN_WARNING "i8k: BIOS version mismatch: %s != %s\n",
                buff, bios_version);
    }

    return 0;
}

static int __init i8k_init(void)
{
    struct proc_dir_entry *proc_i8k;
    int err;

    /* Are we running on an supported laptop? */
    if (i8k_probe())
        return -ENODEV;

    /* Register the proc entry */
    proc_i8k = proc_create("i8k", 0, NULL, &i8k_fops);
    if (!proc_i8k)
        return -ENOENT;

    err = i8k_init_hwmon();
    if (err)
        goto exit_remove_proc;

    printk(KERN_INFO
           "Dell laptop SMM driver v%s Massimo Dal Zotto ([email protected])\n",
           I8K_VERSION);

    return 0;

 exit_remove_proc:
    remove_proc_entry("i8k", NULL);
    return err;
}

static void __exit i8k_exit(void)
{
    i8k_exit_hwmon();
    remove_proc_entry("i8k", NULL);
}

module_init(i8k_init);
module_exit(i8k_exit);