eeepc-laptop.c

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/*
 *  eeepc-laptop.c - Asus Eee PC extras
 *
 *  Based on asus_acpi.c as patched for the Eee PC by Asus:
 *  ftp://ftp.asus.com/pub/ASUS/EeePC/701/ASUS_ACPI_071126.rar
 *  Based on eee.c from eeepc-linux
 *
 *  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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/platform_device.h>
#include <linux/backlight.h>
#include <linux/fb.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/slab.h>
#include <acpi/acpi_drivers.h>
#include <acpi/acpi_bus.h>
#include <linux/uaccess.h>
#include <linux/input.h>
#include <linux/input/sparse-keymap.h>
#include <linux/rfkill.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <linux/leds.h>
#include <linux/dmi.h>

#define EEEPC_LAPTOP_VERSION    "0.1"
#define EEEPC_LAPTOP_NAME   "Eee PC Hotkey Driver"
#define EEEPC_LAPTOP_FILE   "eeepc"

#define EEEPC_ACPI_CLASS    "hotkey"
#define EEEPC_ACPI_DEVICE_NAME  "Hotkey"
#define EEEPC_ACPI_HID      "ASUS010"

MODULE_AUTHOR("Corentin Chary, Eric Cooper");
MODULE_DESCRIPTION(EEEPC_LAPTOP_NAME);
MODULE_LICENSE("GPL");

static bool hotplug_disabled;

module_param(hotplug_disabled, bool, 0444);
MODULE_PARM_DESC(hotplug_disabled,
         "Disable hotplug for wireless device. "
         "If your laptop need that, please report to "
         "[email protected].");

/*
 * Definitions for Asus EeePC
 */
#define NOTIFY_BRN_MIN  0x20
#define NOTIFY_BRN_MAX  0x2f

enum {
    DISABLE_ASL_WLAN = 0x0001,
    DISABLE_ASL_BLUETOOTH = 0x0002,
    DISABLE_ASL_IRDA = 0x0004,
    DISABLE_ASL_CAMERA = 0x0008,
    DISABLE_ASL_TV = 0x0010,
    DISABLE_ASL_GPS = 0x0020,
    DISABLE_ASL_DISPLAYSWITCH = 0x0040,
    DISABLE_ASL_MODEM = 0x0080,
    DISABLE_ASL_CARDREADER = 0x0100,
    DISABLE_ASL_3G = 0x0200,
    DISABLE_ASL_WIMAX = 0x0400,
    DISABLE_ASL_HWCF = 0x0800
};

enum {
    CM_ASL_WLAN = 0,
    CM_ASL_BLUETOOTH,
    CM_ASL_IRDA,
    CM_ASL_1394,
    CM_ASL_CAMERA,
    CM_ASL_TV,
    CM_ASL_GPS,
    CM_ASL_DVDROM,
    CM_ASL_DISPLAYSWITCH,
    CM_ASL_PANELBRIGHT,
    CM_ASL_BIOSFLASH,
    CM_ASL_ACPIFLASH,
    CM_ASL_CPUFV,
    CM_ASL_CPUTEMPERATURE,
    CM_ASL_FANCPU,
    CM_ASL_FANCHASSIS,
    CM_ASL_USBPORT1,
    CM_ASL_USBPORT2,
    CM_ASL_USBPORT3,
    CM_ASL_MODEM,
    CM_ASL_CARDREADER,
    CM_ASL_3G,
    CM_ASL_WIMAX,
    CM_ASL_HWCF,
    CM_ASL_LID,
    CM_ASL_TYPE,
    CM_ASL_PANELPOWER,  /*P901*/
    CM_ASL_TPD
};

static const char *cm_getv[] = {
    "WLDG", "BTHG", NULL, NULL,
    "CAMG", NULL, NULL, NULL,
    NULL, "PBLG", NULL, NULL,
    "CFVG", NULL, NULL, NULL,
    "USBG", NULL, NULL, "MODG",
    "CRDG", "M3GG", "WIMG", "HWCF",
    "LIDG", "TYPE", "PBPG", "TPDG"
};

static const char *cm_setv[] = {
    "WLDS", "BTHS", NULL, NULL,
    "CAMS", NULL, NULL, NULL,
    "SDSP", "PBLS", "HDPS", NULL,
    "CFVS", NULL, NULL, NULL,
    "USBG", NULL, NULL, "MODS",
    "CRDS", "M3GS", "WIMS", NULL,
    NULL, NULL, "PBPS", "TPDS"
};

static const struct key_entry eeepc_keymap[] = {
    { KE_KEY, 0x10, { KEY_WLAN } },
    { KE_KEY, 0x11, { KEY_WLAN } },
    { KE_KEY, 0x12, { KEY_PROG1 } },
    { KE_KEY, 0x13, { KEY_MUTE } },
    { KE_KEY, 0x14, { KEY_VOLUMEDOWN } },
    { KE_KEY, 0x15, { KEY_VOLUMEUP } },
    { KE_KEY, 0x16, { KEY_DISPLAY_OFF } },
    { KE_KEY, 0x1a, { KEY_COFFEE } },
    { KE_KEY, 0x1b, { KEY_ZOOM } },
    { KE_KEY, 0x1c, { KEY_PROG2 } },
    { KE_KEY, 0x1d, { KEY_PROG3 } },
    { KE_KEY, NOTIFY_BRN_MIN, { KEY_BRIGHTNESSDOWN } },
    { KE_KEY, NOTIFY_BRN_MAX, { KEY_BRIGHTNESSUP } },
    { KE_KEY, 0x30, { KEY_SWITCHVIDEOMODE } },
    { KE_KEY, 0x31, { KEY_SWITCHVIDEOMODE } },
    { KE_KEY, 0x32, { KEY_SWITCHVIDEOMODE } },
    { KE_KEY, 0x37, { KEY_F13 } }, /* Disable Touchpad */
    { KE_KEY, 0x38, { KEY_F14 } },
    { KE_END, 0 },
};

/*
 * This is the main structure, we can use it to store useful information
 */
struct eeepc_laptop {
    acpi_handle handle;     /* the handle of the acpi device */
    u32 cm_supported;       /* the control methods supported
                       by this BIOS */
    bool cpufv_disabled;
    bool hotplug_disabled;
    u16 event_count[128];       /* count for each event */

    struct platform_device *platform_device;
    struct acpi_device *device;     /* the device we are in */
    struct device *hwmon_device;
    struct backlight_device *backlight_device;

    struct input_dev *inputdev;

    struct rfkill *wlan_rfkill;
    struct rfkill *bluetooth_rfkill;
    struct rfkill *wwan3g_rfkill;
    struct rfkill *wimax_rfkill;

    struct hotplug_slot *hotplug_slot;
    struct mutex hotplug_lock;

    struct led_classdev tpd_led;
    int tpd_led_wk;
    struct workqueue_struct *led_workqueue;
    struct work_struct tpd_led_work;
};

/*
 * ACPI Helpers
 */
static int write_acpi_int(acpi_handle handle, const char *method, int val)
{
    struct acpi_object_list params;
    union acpi_object in_obj;
    acpi_status status;

    params.count = 1;
    params.pointer = &in_obj;
    in_obj.type = ACPI_TYPE_INTEGER;
    in_obj.integer.value = val;

    status = acpi_evaluate_object(handle, (char *)method, &params, NULL);
    return (status == AE_OK ? 0 : -1);
}

static int read_acpi_int(acpi_handle handle, const char *method, int *val)
{
    acpi_status status;
    unsigned long long result;

    status = acpi_evaluate_integer(handle, (char *)method, NULL, &result);
    if (ACPI_FAILURE(status)) {
        *val = -1;
        return -1;
    } else {
        *val = result;
        return 0;
    }
}

static int set_acpi(struct eeepc_laptop *eeepc, int cm, int value)
{
    const char *method = cm_setv[cm];

    if (method == NULL)
        return -ENODEV;
    if ((eeepc->cm_supported & (0x1 << cm)) == 0)
        return -ENODEV;

    if (write_acpi_int(eeepc->handle, method, value))
        pr_warn("Error writing %s\n", method);
    return 0;
}

static int get_acpi(struct eeepc_laptop *eeepc, int cm)
{
    const char *method = cm_getv[cm];
    int value;

    if (method == NULL)
        return -ENODEV;
    if ((eeepc->cm_supported & (0x1 << cm)) == 0)
        return -ENODEV;

    if (read_acpi_int(eeepc->handle, method, &value))
        pr_warn("Error reading %s\n", method);
    return value;
}

static int acpi_setter_handle(struct eeepc_laptop *eeepc, int cm,
                  acpi_handle *handle)
{
    const char *method = cm_setv[cm];
    acpi_status status;

    if (method == NULL)
        return -ENODEV;
    if ((eeepc->cm_supported & (0x1 << cm)) == 0)
        return -ENODEV;

    status = acpi_get_handle(eeepc->handle, (char *)method,
                 handle);
    if (status != AE_OK) {
        pr_warn("Error finding %s\n", method);
        return -ENODEV;
    }
    return 0;
}


/*
 * Sys helpers
 */
static int parse_arg(const char *buf, unsigned long count, int *val)
{
    if (!count)
        return 0;
    if (sscanf(buf, "%i", val) != 1)
        return -EINVAL;
    return count;
}

static ssize_t store_sys_acpi(struct device *dev, int cm,
                  const char *buf, size_t count)
{
    struct eeepc_laptop *eeepc = dev_get_drvdata(dev);
    int rv, value;

    rv = parse_arg(buf, count, &value);
    if (rv > 0)
        value = set_acpi(eeepc, cm, value);
    if (value < 0)
        return -EIO;
    return rv;
}

static ssize_t show_sys_acpi(struct device *dev, int cm, char *buf)
{
    struct eeepc_laptop *eeepc = dev_get_drvdata(dev);
    int value = get_acpi(eeepc, cm);

    if (value < 0)
        return -EIO;
    return sprintf(buf, "%d\n", value);
}

#define EEEPC_CREATE_DEVICE_ATTR(_name, _mode, _cm)         \
    static ssize_t show_##_name(struct device *dev,         \
                    struct device_attribute *attr,  \
                    char *buf)              \
    {                               \
        return show_sys_acpi(dev, _cm, buf);            \
    }                               \
    static ssize_t store_##_name(struct device *dev,        \
                     struct device_attribute *attr, \
                     const char *buf, size_t count) \
    {                               \
        return store_sys_acpi(dev, _cm, buf, count);        \
    }                               \
    static struct device_attribute dev_attr_##_name = {     \
        .attr = {                       \
            .name = __stringify(_name),         \
            .mode = _mode },                \
        .show   = show_##_name,                 \
        .store  = store_##_name,                \
    }

EEEPC_CREATE_DEVICE_ATTR(camera, 0644, CM_ASL_CAMERA);
EEEPC_CREATE_DEVICE_ATTR(cardr, 0644, CM_ASL_CARDREADER);
EEEPC_CREATE_DEVICE_ATTR(disp, 0200, CM_ASL_DISPLAYSWITCH);

struct eeepc_cpufv {
    int num;
    int cur;
};

static int get_cpufv(struct eeepc_laptop *eeepc, struct eeepc_cpufv *c)
{
    c->cur = get_acpi(eeepc, CM_ASL_CPUFV);
    c->num = (c->cur >> 8) & 0xff;
    c->cur &= 0xff;
    if (c->cur < 0 || c->num <= 0 || c->num > 12)
        return -ENODEV;
    return 0;
}

static ssize_t show_available_cpufv(struct device *dev,
                    struct device_attribute *attr,
                    char *buf)
{
    struct eeepc_laptop *eeepc = dev_get_drvdata(dev);
    struct eeepc_cpufv c;
    int i;
    ssize_t len = 0;

    if (get_cpufv(eeepc, &c))
        return -ENODEV;
    for (i = 0; i < c.num; i++)
        len += sprintf(buf + len, "%d ", i);
    len += sprintf(buf + len, "\n");
    return len;
}

static ssize_t show_cpufv(struct device *dev,
              struct device_attribute *attr,
              char *buf)
{
    struct eeepc_laptop *eeepc = dev_get_drvdata(dev);
    struct eeepc_cpufv c;

    if (get_cpufv(eeepc, &c))
        return -ENODEV;
    return sprintf(buf, "%#x\n", (c.num << 8) | c.cur);
}

static ssize_t store_cpufv(struct device *dev,
               struct device_attribute *attr,
               const char *buf, size_t count)
{
    struct eeepc_laptop *eeepc = dev_get_drvdata(dev);
    struct eeepc_cpufv c;
    int rv, value;

    if (eeepc->cpufv_disabled)
        return -EPERM;
    if (get_cpufv(eeepc, &c))
        return -ENODEV;
    rv = parse_arg(buf, count, &value);
    if (rv < 0)
        return rv;
    if (!rv || value < 0 || value >= c.num)
        return -EINVAL;
    set_acpi(eeepc, CM_ASL_CPUFV, value);
    return rv;
}

static ssize_t show_cpufv_disabled(struct device *dev,
              struct device_attribute *attr,
              char *buf)
{
    struct eeepc_laptop *eeepc = dev_get_drvdata(dev);

    return sprintf(buf, "%d\n", eeepc->cpufv_disabled);
}

static ssize_t store_cpufv_disabled(struct device *dev,
               struct device_attribute *attr,
               const char *buf, size_t count)
{
    struct eeepc_laptop *eeepc = dev_get_drvdata(dev);
    int rv, value;

    rv = parse_arg(buf, count, &value);
    if (rv < 0)
        return rv;

    switch (value) {
    case 0:
        if (eeepc->cpufv_disabled)
            pr_warn("cpufv enabled (not officially supported "
                "on this model)\n");
        eeepc->cpufv_disabled = false;
        return rv;
    case 1:
        return -EPERM;
    default:
        return -EINVAL;
    }
}


static struct device_attribute dev_attr_cpufv = {
    .attr = {
        .name = "cpufv",
        .mode = 0644 },
    .show   = show_cpufv,
    .store  = store_cpufv
};

static struct device_attribute dev_attr_available_cpufv = {
    .attr = {
        .name = "available_cpufv",
        .mode = 0444 },
    .show   = show_available_cpufv
};

static struct device_attribute dev_attr_cpufv_disabled = {
    .attr = {
        .name = "cpufv_disabled",
        .mode = 0644 },
    .show   = show_cpufv_disabled,
    .store  = store_cpufv_disabled
};


static struct attribute *platform_attributes[] = {
    &dev_attr_camera.attr,
    &dev_attr_cardr.attr,
    &dev_attr_disp.attr,
    &dev_attr_cpufv.attr,
    &dev_attr_available_cpufv.attr,
    &dev_attr_cpufv_disabled.attr,
    NULL
};

static struct attribute_group platform_attribute_group = {
    .attrs = platform_attributes
};

static int eeepc_platform_init(struct eeepc_laptop *eeepc)
{
    int result;

    eeepc->platform_device = platform_device_alloc(EEEPC_LAPTOP_FILE, -1);
    if (!eeepc->platform_device)
        return -ENOMEM;
    platform_set_drvdata(eeepc->platform_device, eeepc);

    result = platform_device_add(eeepc->platform_device);
    if (result)
        goto fail_platform_device;

    result = sysfs_create_group(&eeepc->platform_device->dev.kobj,
                    &platform_attribute_group);
    if (result)
        goto fail_sysfs;
    return 0;

fail_sysfs:
    platform_device_del(eeepc->platform_device);
fail_platform_device:
    platform_device_put(eeepc->platform_device);
    return result;
}

static void eeepc_platform_exit(struct eeepc_laptop *eeepc)
{
    sysfs_remove_group(&eeepc->platform_device->dev.kobj,
               &platform_attribute_group);
    platform_device_unregister(eeepc->platform_device);
}

/*
 * LEDs
 */
/*
 * These functions actually update the LED's, and are called from a
 * workqueue. By doing this as separate work rather than when the LED
 * subsystem asks, we avoid messing with the Asus ACPI stuff during a
 * potentially bad time, such as a timer interrupt.
 */
static void tpd_led_update(struct work_struct *work)
 {
    struct eeepc_laptop *eeepc;

    eeepc = container_of(work, struct eeepc_laptop, tpd_led_work);

    set_acpi(eeepc, CM_ASL_TPD, eeepc->tpd_led_wk);
}

static void tpd_led_set(struct led_classdev *led_cdev,
            enum led_brightness value)
{
    struct eeepc_laptop *eeepc;

    eeepc = container_of(led_cdev, struct eeepc_laptop, tpd_led);

    eeepc->tpd_led_wk = (value > 0) ? 1 : 0;
    queue_work(eeepc->led_workqueue, &eeepc->tpd_led_work);
}

static enum led_brightness tpd_led_get(struct led_classdev *led_cdev)
{
    struct eeepc_laptop *eeepc;

    eeepc = container_of(led_cdev, struct eeepc_laptop, tpd_led);

    return get_acpi(eeepc, CM_ASL_TPD);
}

static int eeepc_led_init(struct eeepc_laptop *eeepc)
{
    int rv;

    if (get_acpi(eeepc, CM_ASL_TPD) == -ENODEV)
        return 0;

    eeepc->led_workqueue = create_singlethread_workqueue("led_workqueue");
    if (!eeepc->led_workqueue)
        return -ENOMEM;
    INIT_WORK(&eeepc->tpd_led_work, tpd_led_update);

    eeepc->tpd_led.name = "eeepc::touchpad";
    eeepc->tpd_led.brightness_set = tpd_led_set;
    if (get_acpi(eeepc, CM_ASL_TPD) >= 0) /* if method is available */
      eeepc->tpd_led.brightness_get = tpd_led_get;
    eeepc->tpd_led.max_brightness = 1;

    rv = led_classdev_register(&eeepc->platform_device->dev,
                   &eeepc->tpd_led);
    if (rv) {
        destroy_workqueue(eeepc->led_workqueue);
        return rv;
    }

    return 0;
}

static void eeepc_led_exit(struct eeepc_laptop *eeepc)
{
    if (!IS_ERR_OR_NULL(eeepc->tpd_led.dev))
        led_classdev_unregister(&eeepc->tpd_led);
    if (eeepc->led_workqueue)
        destroy_workqueue(eeepc->led_workqueue);
}


/*
 * PCI hotplug (for wlan rfkill)
 */
static bool eeepc_wlan_rfkill_blocked(struct eeepc_laptop *eeepc)
{
    if (get_acpi(eeepc, CM_ASL_WLAN) == 1)
        return false;
    return true;
}

static void eeepc_rfkill_hotplug(struct eeepc_laptop *eeepc, acpi_handle handle)
{
    struct pci_dev *port;
    struct pci_dev *dev;
    struct pci_bus *bus;
    bool blocked = eeepc_wlan_rfkill_blocked(eeepc);
    bool absent;
    u32 l;

    if (eeepc->wlan_rfkill)
        rfkill_set_sw_state(eeepc->wlan_rfkill, blocked);

    mutex_lock(&eeepc->hotplug_lock);

    if (eeepc->hotplug_slot) {
        port = acpi_get_pci_dev(handle);
        if (!port) {
            pr_warning("Unable to find port\n");
            goto out_unlock;
        }

        bus = port->subordinate;

        if (!bus) {
            pr_warn("Unable to find PCI bus 1?\n");
            goto out_put_dev;
        }

        if (pci_bus_read_config_dword(bus, 0, PCI_VENDOR_ID, &l)) {
            pr_err("Unable to read PCI config space?\n");
            goto out_put_dev;
        }

        absent = (l == 0xffffffff);

        if (blocked != absent) {
            pr_warn("BIOS says wireless lan is %s, "
                "but the pci device is %s\n",
                blocked ? "blocked" : "unblocked",
                absent ? "absent" : "present");
            pr_warn("skipped wireless hotplug as probably "
                "inappropriate for this model\n");
            goto out_put_dev;
        }

        if (!blocked) {
            dev = pci_get_slot(bus, 0);
            if (dev) {
                /* Device already present */
                pci_dev_put(dev);
                goto out_put_dev;
            }
            dev = pci_scan_single_device(bus, 0);
            if (dev) {
                pci_bus_assign_resources(bus);
                if (pci_bus_add_device(dev))
                    pr_err("Unable to hotplug wifi\n");
            }
        } else {
            dev = pci_get_slot(bus, 0);
            if (dev) {
                pci_stop_and_remove_bus_device(dev);
                pci_dev_put(dev);
            }
        }
out_put_dev:
        pci_dev_put(port);
    }

out_unlock:
    mutex_unlock(&eeepc->hotplug_lock);
}

static void eeepc_rfkill_hotplug_update(struct eeepc_laptop *eeepc, char *node)
{
    acpi_status status = AE_OK;
    acpi_handle handle;

    status = acpi_get_handle(NULL, node, &handle);

    if (ACPI_SUCCESS(status))
        eeepc_rfkill_hotplug(eeepc, handle);
}

static void eeepc_rfkill_notify(acpi_handle handle, u32 event, void *data)
{
    struct eeepc_laptop *eeepc = data;

    if (event != ACPI_NOTIFY_BUS_CHECK)
        return;

    eeepc_rfkill_hotplug(eeepc, handle);
}

static int eeepc_register_rfkill_notifier(struct eeepc_laptop *eeepc,
                      char *node)
{
    acpi_status status;
    acpi_handle handle;

    status = acpi_get_handle(NULL, node, &handle);

    if (ACPI_SUCCESS(status)) {
        status = acpi_install_notify_handler(handle,
                             ACPI_SYSTEM_NOTIFY,
                             eeepc_rfkill_notify,
                             eeepc);
        if (ACPI_FAILURE(status))
            pr_warn("Failed to register notify on %s\n", node);

        /*
         * Refresh pci hotplug in case the rfkill state was
         * changed during setup.
         */
        eeepc_rfkill_hotplug(eeepc, handle);
    } else
        return -ENODEV;

    return 0;
}

static void eeepc_unregister_rfkill_notifier(struct eeepc_laptop *eeepc,
                         char *node)
{
    acpi_status status = AE_OK;
    acpi_handle handle;

    status = acpi_get_handle(NULL, node, &handle);

    if (ACPI_SUCCESS(status)) {
        status = acpi_remove_notify_handler(handle,
                             ACPI_SYSTEM_NOTIFY,
                             eeepc_rfkill_notify);
        if (ACPI_FAILURE(status))
            pr_err("Error removing rfkill notify handler %s\n",
                node);
            /*
             * Refresh pci hotplug in case the rfkill
             * state was changed after
             * eeepc_unregister_rfkill_notifier()
             */
        eeepc_rfkill_hotplug(eeepc, handle);
    }
}

static int eeepc_get_adapter_status(struct hotplug_slot *hotplug_slot,
                    u8 *value)
{
    struct eeepc_laptop *eeepc = hotplug_slot->private;
    int val = get_acpi(eeepc, CM_ASL_WLAN);

    if (val == 1 || val == 0)
        *value = val;
    else
        return -EINVAL;

    return 0;
}

static void eeepc_cleanup_pci_hotplug(struct hotplug_slot *hotplug_slot)
{
    kfree(hotplug_slot->info);
    kfree(hotplug_slot);
}

static struct hotplug_slot_ops eeepc_hotplug_slot_ops = {
    .owner = THIS_MODULE,
    .get_adapter_status = eeepc_get_adapter_status,
    .get_power_status = eeepc_get_adapter_status,
};

static int eeepc_setup_pci_hotplug(struct eeepc_laptop *eeepc)
{
    int ret = -ENOMEM;
    struct pci_bus *bus = pci_find_bus(0, 1);

    if (!bus) {
        pr_err("Unable to find wifi PCI bus\n");
        return -ENODEV;
    }

    eeepc->hotplug_slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
    if (!eeepc->hotplug_slot)
        goto error_slot;

    eeepc->hotplug_slot->info = kzalloc(sizeof(struct hotplug_slot_info),
                        GFP_KERNEL);
    if (!eeepc->hotplug_slot->info)
        goto error_info;

    eeepc->hotplug_slot->private = eeepc;
    eeepc->hotplug_slot->release = &eeepc_cleanup_pci_hotplug;
    eeepc->hotplug_slot->ops = &eeepc_hotplug_slot_ops;
    eeepc_get_adapter_status(eeepc->hotplug_slot,
                 &eeepc->hotplug_slot->info->adapter_status);

    ret = pci_hp_register(eeepc->hotplug_slot, bus, 0, "eeepc-wifi");
    if (ret) {
        pr_err("Unable to register hotplug slot - %d\n", ret);
        goto error_register;
    }

    return 0;

error_register:
    kfree(eeepc->hotplug_slot->info);
error_info:
    kfree(eeepc->hotplug_slot);
    eeepc->hotplug_slot = NULL;
error_slot:
    return ret;
}

/*
 * Rfkill devices
 */
static int eeepc_rfkill_set(void *data, bool blocked)
{
    acpi_handle handle = data;

    return write_acpi_int(handle, NULL, !blocked);
}

static const struct rfkill_ops eeepc_rfkill_ops = {
    .set_block = eeepc_rfkill_set,
};

static int eeepc_new_rfkill(struct eeepc_laptop *eeepc,
                struct rfkill **rfkill,
                const char *name,
                enum rfkill_type type, int cm)
{
    acpi_handle handle;
    int result;

    result = acpi_setter_handle(eeepc, cm, &handle);
    if (result < 0)
        return result;

    *rfkill = rfkill_alloc(name, &eeepc->platform_device->dev, type,
                   &eeepc_rfkill_ops, handle);

    if (!*rfkill)
        return -EINVAL;

    rfkill_init_sw_state(*rfkill, get_acpi(eeepc, cm) != 1);
    result = rfkill_register(*rfkill);
    if (result) {
        rfkill_destroy(*rfkill);
        *rfkill = NULL;
        return result;
    }
    return 0;
}

static void eeepc_rfkill_exit(struct eeepc_laptop *eeepc)
{
    eeepc_unregister_rfkill_notifier(eeepc, "\\_SB.PCI0.P0P5");
    eeepc_unregister_rfkill_notifier(eeepc, "\\_SB.PCI0.P0P6");
    eeepc_unregister_rfkill_notifier(eeepc, "\\_SB.PCI0.P0P7");
    if (eeepc->wlan_rfkill) {
        rfkill_unregister(eeepc->wlan_rfkill);
        rfkill_destroy(eeepc->wlan_rfkill);
        eeepc->wlan_rfkill = NULL;
    }

    if (eeepc->hotplug_slot)
        pci_hp_deregister(eeepc->hotplug_slot);

    if (eeepc->bluetooth_rfkill) {
        rfkill_unregister(eeepc->bluetooth_rfkill);
        rfkill_destroy(eeepc->bluetooth_rfkill);
        eeepc->bluetooth_rfkill = NULL;
    }
    if (eeepc->wwan3g_rfkill) {
        rfkill_unregister(eeepc->wwan3g_rfkill);
        rfkill_destroy(eeepc->wwan3g_rfkill);
        eeepc->wwan3g_rfkill = NULL;
    }
    if (eeepc->wimax_rfkill) {
        rfkill_unregister(eeepc->wimax_rfkill);
        rfkill_destroy(eeepc->wimax_rfkill);
        eeepc->wimax_rfkill = NULL;
    }
}

static int eeepc_rfkill_init(struct eeepc_laptop *eeepc)
{
    int result = 0;

    mutex_init(&eeepc->hotplug_lock);

    result = eeepc_new_rfkill(eeepc, &eeepc->wlan_rfkill,
                  "eeepc-wlan", RFKILL_TYPE_WLAN,
                  CM_ASL_WLAN);

    if (result && result != -ENODEV)
        goto exit;

    result = eeepc_new_rfkill(eeepc, &eeepc->bluetooth_rfkill,
                  "eeepc-bluetooth", RFKILL_TYPE_BLUETOOTH,
                  CM_ASL_BLUETOOTH);

    if (result && result != -ENODEV)
        goto exit;

    result = eeepc_new_rfkill(eeepc, &eeepc->wwan3g_rfkill,
                  "eeepc-wwan3g", RFKILL_TYPE_WWAN,
                  CM_ASL_3G);

    if (result && result != -ENODEV)
        goto exit;

    result = eeepc_new_rfkill(eeepc, &eeepc->wimax_rfkill,
                  "eeepc-wimax", RFKILL_TYPE_WIMAX,
                  CM_ASL_WIMAX);

    if (result && result != -ENODEV)
        goto exit;

    if (eeepc->hotplug_disabled)
        return 0;

    result = eeepc_setup_pci_hotplug(eeepc);
    /*
     * If we get -EBUSY then something else is handling the PCI hotplug -
     * don't fail in this case
     */
    if (result == -EBUSY)
        result = 0;

    eeepc_register_rfkill_notifier(eeepc, "\\_SB.PCI0.P0P5");
    eeepc_register_rfkill_notifier(eeepc, "\\_SB.PCI0.P0P6");
    eeepc_register_rfkill_notifier(eeepc, "\\_SB.PCI0.P0P7");

exit:
    if (result && result != -ENODEV)
        eeepc_rfkill_exit(eeepc);
    return result;
}

/*
 * Platform driver - hibernate/resume callbacks
 */
static int eeepc_hotk_thaw(struct device *device)
{
    struct eeepc_laptop *eeepc = dev_get_drvdata(device);

    if (eeepc->wlan_rfkill) {
        bool wlan;

        /*
         * Work around bios bug - acpi _PTS turns off the wireless led
         * during suspend.  Normally it restores it on resume, but
         * we should kick it ourselves in case hibernation is aborted.
         */
        wlan = get_acpi(eeepc, CM_ASL_WLAN);
        set_acpi(eeepc, CM_ASL_WLAN, wlan);
    }

    return 0;
}

static int eeepc_hotk_restore(struct device *device)
{
    struct eeepc_laptop *eeepc = dev_get_drvdata(device);

    /* Refresh both wlan rfkill state and pci hotplug */
    if (eeepc->wlan_rfkill) {
        eeepc_rfkill_hotplug_update(eeepc, "\\_SB.PCI0.P0P5");
        eeepc_rfkill_hotplug_update(eeepc, "\\_SB.PCI0.P0P6");
        eeepc_rfkill_hotplug_update(eeepc, "\\_SB.PCI0.P0P7");
    }

    if (eeepc->bluetooth_rfkill)
        rfkill_set_sw_state(eeepc->bluetooth_rfkill,
                    get_acpi(eeepc, CM_ASL_BLUETOOTH) != 1);
    if (eeepc->wwan3g_rfkill)
        rfkill_set_sw_state(eeepc->wwan3g_rfkill,
                    get_acpi(eeepc, CM_ASL_3G) != 1);
    if (eeepc->wimax_rfkill)
        rfkill_set_sw_state(eeepc->wimax_rfkill,
                    get_acpi(eeepc, CM_ASL_WIMAX) != 1);

    return 0;
}

static const struct dev_pm_ops eeepc_pm_ops = {
    .thaw = eeepc_hotk_thaw,
    .restore = eeepc_hotk_restore,
};

static struct platform_driver platform_driver = {
    .driver = {
        .name = EEEPC_LAPTOP_FILE,
        .owner = THIS_MODULE,
        .pm = &eeepc_pm_ops,
    }
};

/*
 * Hwmon device
 */

#define EEEPC_EC_SC00      0x61
#define EEEPC_EC_FAN_PWM   (EEEPC_EC_SC00 + 2) /* Fan PWM duty cycle (%) */
#define EEEPC_EC_FAN_HRPM  (EEEPC_EC_SC00 + 5) /* High byte, fan speed (RPM) */
#define EEEPC_EC_FAN_LRPM  (EEEPC_EC_SC00 + 6) /* Low byte, fan speed (RPM) */

#define EEEPC_EC_SFB0      0xD0
#define EEEPC_EC_FAN_CTRL  (EEEPC_EC_SFB0 + 3) /* Byte containing SF25  */

static int eeepc_get_fan_pwm(void)
{
    u8 value = 0;

    ec_read(EEEPC_EC_FAN_PWM, &value);
    return value * 255 / 100;
}

static void eeepc_set_fan_pwm(int value)
{
    value = SENSORS_LIMIT(value, 0, 255);
    value = value * 100 / 255;
    ec_write(EEEPC_EC_FAN_PWM, value);
}

static int eeepc_get_fan_rpm(void)
{
    u8 high = 0;
    u8 low = 0;

    ec_read(EEEPC_EC_FAN_HRPM, &high);
    ec_read(EEEPC_EC_FAN_LRPM, &low);
    return high << 8 | low;
}

static int eeepc_get_fan_ctrl(void)
{
    u8 value = 0;

    ec_read(EEEPC_EC_FAN_CTRL, &value);
    if (value & 0x02)
        return 1; /* manual */
    else
        return 2; /* automatic */
}

static void eeepc_set_fan_ctrl(int manual)
{
    u8 value = 0;

    ec_read(EEEPC_EC_FAN_CTRL, &value);
    if (manual == 1)
        value |= 0x02;
    else
        value &= ~0x02;
    ec_write(EEEPC_EC_FAN_CTRL, value);
}

static ssize_t store_sys_hwmon(void (*set)(int), const char *buf, size_t count)
{
    int rv, value;

    rv = parse_arg(buf, count, &value);
    if (rv > 0)
        set(value);
    return rv;
}

static ssize_t show_sys_hwmon(int (*get)(void), char *buf)
{
    return sprintf(buf, "%d\n", get());
}

#define EEEPC_CREATE_SENSOR_ATTR(_name, _mode, _set, _get)      \
    static ssize_t show_##_name(struct device *dev,         \
                    struct device_attribute *attr,  \
                    char *buf)              \
    {                               \
        return show_sys_hwmon(_set, buf);           \
    }                               \
    static ssize_t store_##_name(struct device *dev,        \
                     struct device_attribute *attr, \
                     const char *buf, size_t count) \
    {                               \
        return store_sys_hwmon(_get, buf, count);       \
    }                               \
    static SENSOR_DEVICE_ATTR(_name, _mode, show_##_name, store_##_name, 0);

EEEPC_CREATE_SENSOR_ATTR(fan1_input, S_IRUGO, eeepc_get_fan_rpm, NULL);
EEEPC_CREATE_SENSOR_ATTR(pwm1, S_IRUGO | S_IWUSR,
             eeepc_get_fan_pwm, eeepc_set_fan_pwm);
EEEPC_CREATE_SENSOR_ATTR(pwm1_enable, S_IRUGO | S_IWUSR,
             eeepc_get_fan_ctrl, eeepc_set_fan_ctrl);

static ssize_t
show_name(struct device *dev, struct device_attribute *attr, char *buf)
{
    return sprintf(buf, "eeepc\n");
}
static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);

static struct attribute *hwmon_attributes[] = {
    &sensor_dev_attr_pwm1.dev_attr.attr,
    &sensor_dev_attr_fan1_input.dev_attr.attr,
    &sensor_dev_attr_pwm1_enable.dev_attr.attr,
    &sensor_dev_attr_name.dev_attr.attr,
    NULL
};

static struct attribute_group hwmon_attribute_group = {
    .attrs = hwmon_attributes
};

static void eeepc_hwmon_exit(struct eeepc_laptop *eeepc)
{
    struct device *hwmon;

    hwmon = eeepc->hwmon_device;
    if (!hwmon)
        return;
    sysfs_remove_group(&hwmon->kobj,
               &hwmon_attribute_group);
    hwmon_device_unregister(hwmon);
    eeepc->hwmon_device = NULL;
}

static int eeepc_hwmon_init(struct eeepc_laptop *eeepc)
{
    struct device *hwmon;
    int result;

    hwmon = hwmon_device_register(&eeepc->platform_device->dev);
    if (IS_ERR(hwmon)) {
        pr_err("Could not register eeepc hwmon device\n");
        eeepc->hwmon_device = NULL;
        return PTR_ERR(hwmon);
    }
    eeepc->hwmon_device = hwmon;
    result = sysfs_create_group(&hwmon->kobj,
                    &hwmon_attribute_group);
    if (result)
        eeepc_hwmon_exit(eeepc);
    return result;
}

/*
 * Backlight device
 */
static int read_brightness(struct backlight_device *bd)
{
    struct eeepc_laptop *eeepc = bl_get_data(bd);

    return get_acpi(eeepc, CM_ASL_PANELBRIGHT);
}

static int set_brightness(struct backlight_device *bd, int value)
{
    struct eeepc_laptop *eeepc = bl_get_data(bd);

    return set_acpi(eeepc, CM_ASL_PANELBRIGHT, value);
}

static int update_bl_status(struct backlight_device *bd)
{
    return set_brightness(bd, bd->props.brightness);
}

static const struct backlight_ops eeepcbl_ops = {
    .get_brightness = read_brightness,
    .update_status = update_bl_status,
};

static int eeepc_backlight_notify(struct eeepc_laptop *eeepc)
{
    struct backlight_device *bd = eeepc->backlight_device;
    int old = bd->props.brightness;

    backlight_force_update(bd, BACKLIGHT_UPDATE_HOTKEY);

    return old;
}

static int eeepc_backlight_init(struct eeepc_laptop *eeepc)
{
    struct backlight_properties props;
    struct backlight_device *bd;

    memset(&props, 0, sizeof(struct backlight_properties));
    props.type = BACKLIGHT_PLATFORM;
    props.max_brightness = 15;
    bd = backlight_device_register(EEEPC_LAPTOP_FILE,
                       &eeepc->platform_device->dev, eeepc,
                       &eeepcbl_ops, &props);
    if (IS_ERR(bd)) {
        pr_err("Could not register eeepc backlight device\n");
        eeepc->backlight_device = NULL;
        return PTR_ERR(bd);
    }
    eeepc->backlight_device = bd;
    bd->props.brightness = read_brightness(bd);
    bd->props.power = FB_BLANK_UNBLANK;
    backlight_update_status(bd);
    return 0;
}

static void eeepc_backlight_exit(struct eeepc_laptop *eeepc)
{
    if (eeepc->backlight_device)
        backlight_device_unregister(eeepc->backlight_device);
    eeepc->backlight_device = NULL;
}


/*
 * Input device (i.e. hotkeys)
 */
static int eeepc_input_init(struct eeepc_laptop *eeepc)
{
    struct input_dev *input;
    int error;

    input = input_allocate_device();
    if (!input) {
        pr_info("Unable to allocate input device\n");
        return -ENOMEM;
    }

    input->name = "Asus EeePC extra buttons";
    input->phys = EEEPC_LAPTOP_FILE "/input0";
    input->id.bustype = BUS_HOST;
    input->dev.parent = &eeepc->platform_device->dev;

    error = sparse_keymap_setup(input, eeepc_keymap, NULL);
    if (error) {
        pr_err("Unable to setup input device keymap\n");
        goto err_free_dev;
    }

    error = input_register_device(input);
    if (error) {
        pr_err("Unable to register input device\n");
        goto err_free_keymap;
    }

    eeepc->inputdev = input;
    return 0;

err_free_keymap:
    sparse_keymap_free(input);
err_free_dev:
    input_free_device(input);
    return error;
}

static void eeepc_input_exit(struct eeepc_laptop *eeepc)
{
    if (eeepc->inputdev) {
        sparse_keymap_free(eeepc->inputdev);
        input_unregister_device(eeepc->inputdev);
    }
    eeepc->inputdev = NULL;
}

/*
 * ACPI driver
 */
static void eeepc_input_notify(struct eeepc_laptop *eeepc, int event)
{
    if (!eeepc->inputdev)
        return ;
    if (!sparse_keymap_report_event(eeepc->inputdev, event, 1, true))
        pr_info("Unknown key %x pressed\n", event);
}

static void eeepc_acpi_notify(struct acpi_device *device, u32 event)
{
    struct eeepc_laptop *eeepc = acpi_driver_data(device);
    u16 count;

    if (event > ACPI_MAX_SYS_NOTIFY)
        return;
    count = eeepc->event_count[event % 128]++;
    acpi_bus_generate_proc_event(device, event, count);
    acpi_bus_generate_netlink_event(device->pnp.device_class,
                    dev_name(&device->dev), event,
                    count);

    /* Brightness events are special */
    if (event >= NOTIFY_BRN_MIN && event <= NOTIFY_BRN_MAX) {

        /* Ignore them completely if the acpi video driver is used */
        if (eeepc->backlight_device != NULL) {
            int old_brightness, new_brightness;

            /* Update the backlight device. */
            old_brightness = eeepc_backlight_notify(eeepc);

            /* Convert event to keypress (obsolescent hack) */
            new_brightness = event - NOTIFY_BRN_MIN;

            if (new_brightness < old_brightness) {
                event = NOTIFY_BRN_MIN; /* brightness down */
            } else if (new_brightness > old_brightness) {
                event = NOTIFY_BRN_MAX; /* brightness up */
            } else {
                /*
                * no change in brightness - already at min/max,
                * event will be desired value (or else ignored)
                */
            }
            eeepc_input_notify(eeepc, event);
        }
    } else {
        /* Everything else is a bona-fide keypress event */
        eeepc_input_notify(eeepc, event);
    }
}

static void eeepc_dmi_check(struct eeepc_laptop *eeepc)
{
    const char *model;

    model = dmi_get_system_info(DMI_PRODUCT_NAME);
    if (!model)
        return;

    /*
     * Blacklist for setting cpufv (cpu speed).
     *
     * EeePC 4G ("701") implements CFVS, but it is not supported
     * by the pre-installed OS, and the original option to change it
     * in the BIOS setup screen was removed in later versions.
     *
     * Judging by the lack of "Super Hybrid Engine" on Asus product pages,
     * this applies to all "701" models (4G/4G Surf/2G Surf).
     *
     * So Asus made a deliberate decision not to support it on this model.
     * We have several reports that using it can cause the system to hang
     *
     * The hang has also been reported on a "702" (Model name "8G"?).
     *
     * We avoid dmi_check_system() / dmi_match(), because they use
     * substring matching.  We don't want to affect the "701SD"
     * and "701SDX" models, because they do support S.H.E.
     */
    if (strcmp(model, "701") == 0 || strcmp(model, "702") == 0) {
        eeepc->cpufv_disabled = true;
        pr_info("model %s does not officially support setting cpu "
            "speed\n", model);
        pr_info("cpufv disabled to avoid instability\n");
    }

    /*
     * Blacklist for wlan hotplug
     *
     * Eeepc 1005HA doesn't work like others models and don't need the
     * hotplug code. In fact, current hotplug code seems to unplug another
     * device...
     */
    if (strcmp(model, "1005HA") == 0 || strcmp(model, "1201N") == 0 ||
        strcmp(model, "1005PE") == 0) {
        eeepc->hotplug_disabled = true;
        pr_info("wlan hotplug disabled\n");
    }
}

static void cmsg_quirk(struct eeepc_laptop *eeepc, int cm, const char *name)
{
    int dummy;

    /* Some BIOSes do not report cm although it is available.
       Check if cm_getv[cm] works and, if yes, assume cm should be set. */
    if (!(eeepc->cm_supported & (1 << cm))
        && !read_acpi_int(eeepc->handle, cm_getv[cm], &dummy)) {
        pr_info("%s (%x) not reported by BIOS,"
            " enabling anyway\n", name, 1 << cm);
        eeepc->cm_supported |= 1 << cm;
    }
}

static void cmsg_quirks(struct eeepc_laptop *eeepc)
{
    cmsg_quirk(eeepc, CM_ASL_LID, "LID");
    cmsg_quirk(eeepc, CM_ASL_TYPE, "TYPE");
    cmsg_quirk(eeepc, CM_ASL_PANELPOWER, "PANELPOWER");
    cmsg_quirk(eeepc, CM_ASL_TPD, "TPD");
}

static int __devinit eeepc_acpi_init(struct eeepc_laptop *eeepc)
{
    unsigned int init_flags;
    int result;

    result = acpi_bus_get_status(eeepc->device);
    if (result)
        return result;
    if (!eeepc->device->status.present) {
        pr_err("Hotkey device not present, aborting\n");
        return -ENODEV;
    }

    init_flags = DISABLE_ASL_WLAN | DISABLE_ASL_DISPLAYSWITCH;
    pr_notice("Hotkey init flags 0x%x\n", init_flags);

    if (write_acpi_int(eeepc->handle, "INIT", init_flags)) {
        pr_err("Hotkey initialization failed\n");
        return -ENODEV;
    }

    /* get control methods supported */
    if (read_acpi_int(eeepc->handle, "CMSG", &eeepc->cm_supported)) {
        pr_err("Get control methods supported failed\n");
        return -ENODEV;
    }
    cmsg_quirks(eeepc);
    pr_info("Get control methods supported: 0x%x\n", eeepc->cm_supported);

    return 0;
}

static void __devinit eeepc_enable_camera(struct eeepc_laptop *eeepc)
{
    /*
     * If the following call to set_acpi() fails, it's because there's no
     * camera so we can ignore the error.
     */
    if (get_acpi(eeepc, CM_ASL_CAMERA) == 0)
        set_acpi(eeepc, CM_ASL_CAMERA, 1);
}

static bool eeepc_device_present;

static int __devinit eeepc_acpi_add(struct acpi_device *device)
{
    struct eeepc_laptop *eeepc;
    int result;

    pr_notice(EEEPC_LAPTOP_NAME "\n");
    eeepc = kzalloc(sizeof(struct eeepc_laptop), GFP_KERNEL);
    if (!eeepc)
        return -ENOMEM;
    eeepc->handle = device->handle;
    strcpy(acpi_device_name(device), EEEPC_ACPI_DEVICE_NAME);
    strcpy(acpi_device_class(device), EEEPC_ACPI_CLASS);
    device->driver_data = eeepc;
    eeepc->device = device;

    eeepc->hotplug_disabled = hotplug_disabled;

    eeepc_dmi_check(eeepc);

    result = eeepc_acpi_init(eeepc);
    if (result)
        goto fail_platform;
    eeepc_enable_camera(eeepc);

    /*
     * Register the platform device first.  It is used as a parent for the
     * sub-devices below.
     *
     * Note that if there are multiple instances of this ACPI device it
     * will bail out, because the platform device is registered with a
     * fixed name.  Of course it doesn't make sense to have more than one,
     * and machine-specific scripts find the fixed name convenient.  But
     * It's also good for us to exclude multiple instances because both
     * our hwmon and our wlan rfkill subdevice use global ACPI objects
     * (the EC and the wlan PCI slot respectively).
     */
    result = eeepc_platform_init(eeepc);
    if (result)
        goto fail_platform;

    if (!acpi_video_backlight_support()) {
        result = eeepc_backlight_init(eeepc);
        if (result)
            goto fail_backlight;
    } else
        pr_info("Backlight controlled by ACPI video driver\n");

    result = eeepc_input_init(eeepc);
    if (result)
        goto fail_input;

    result = eeepc_hwmon_init(eeepc);
    if (result)
        goto fail_hwmon;

    result = eeepc_led_init(eeepc);
    if (result)
        goto fail_led;

    result = eeepc_rfkill_init(eeepc);
    if (result)
        goto fail_rfkill;

    eeepc_device_present = true;
    return 0;

fail_rfkill:
    eeepc_led_exit(eeepc);
fail_led:
    eeepc_hwmon_exit(eeepc);
fail_hwmon:
    eeepc_input_exit(eeepc);
fail_input:
    eeepc_backlight_exit(eeepc);
fail_backlight:
    eeepc_platform_exit(eeepc);
fail_platform:
    kfree(eeepc);

    return result;
}

static int eeepc_acpi_remove(struct acpi_device *device, int type)
{
    struct eeepc_laptop *eeepc = acpi_driver_data(device);

    eeepc_backlight_exit(eeepc);
    eeepc_rfkill_exit(eeepc);
    eeepc_input_exit(eeepc);
    eeepc_hwmon_exit(eeepc);
    eeepc_led_exit(eeepc);
    eeepc_platform_exit(eeepc);

    kfree(eeepc);
    return 0;
}


static const struct acpi_device_id eeepc_device_ids[] = {
    {EEEPC_ACPI_HID, 0},
    {"", 0},
};
MODULE_DEVICE_TABLE(acpi, eeepc_device_ids);

static struct acpi_driver eeepc_acpi_driver = {
    .name = EEEPC_LAPTOP_NAME,
    .class = EEEPC_ACPI_CLASS,
    .owner = THIS_MODULE,
    .ids = eeepc_device_ids,
    .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
    .ops = {
        .add = eeepc_acpi_add,
        .remove = eeepc_acpi_remove,
        .notify = eeepc_acpi_notify,
    },
};


static int __init eeepc_laptop_init(void)
{
    int result;

    result = platform_driver_register(&platform_driver);
    if (result < 0)
        return result;

    result = acpi_bus_register_driver(&eeepc_acpi_driver);
    if (result < 0)
        goto fail_acpi_driver;

    if (!eeepc_device_present) {
        result = -ENODEV;
        goto fail_no_device;
    }

    return 0;

fail_no_device:
    acpi_bus_unregister_driver(&eeepc_acpi_driver);
fail_acpi_driver:
    platform_driver_unregister(&platform_driver);
    return result;
}

static void __exit eeepc_laptop_exit(void)
{
    acpi_bus_unregister_driver(&eeepc_acpi_driver);
    platform_driver_unregister(&platform_driver);
}

module_init(eeepc_laptop_init);
module_exit(eeepc_laptop_exit);