/*
 *  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 <linux/acpi.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>
#include <acpi/video.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 "
                 "acpi4asus-user@lists.sourceforge.net.");

/*
 * 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_IGNORE, 0x50, { KEY_RESERVED } }, /* AC plugged */
        { KE_IGNORE, 0x51, { KEY_RESERVED } }, /* AC unplugged */
        { 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 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)
{
        acpi_status status;

        status = acpi_execute_simple_method(handle, (char *)method, val);

        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, int *val)
{
        if (sscanf(buf, "%i", val) != 1)
                return -EINVAL;
        return 0;
}

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

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_ACPI_SHOW_FUNC(_name, _cm)                                \
        static ssize_t _name##_show(struct device *dev,                 \
                                    struct device_attribute *attr,      \
                                    char *buf)                          \
        {                                                               \
                return show_sys_acpi(dev, _cm, buf);                    \
        }

#define EEEPC_ACPI_STORE_FUNC(_name, _cm)                               \
        static ssize_t _name##_store(struct device *dev,                \
                                     struct device_attribute *attr,     \
                                     const char *buf, size_t count)     \
        {                                                               \
                return store_sys_acpi(dev, _cm, buf, count);            \
        }

#define EEEPC_CREATE_DEVICE_ATTR_RW(_name, _cm)                         \
        EEEPC_ACPI_SHOW_FUNC(_name, _cm)                                \
        EEEPC_ACPI_STORE_FUNC(_name, _cm)                               \
        static DEVICE_ATTR_RW(_name)

#define EEEPC_CREATE_DEVICE_ATTR_WO(_name, _cm)                         \
        EEEPC_ACPI_STORE_FUNC(_name, _cm)                               \
        static DEVICE_ATTR_WO(_name)

EEEPC_CREATE_DEVICE_ATTR_RW(camera, CM_ASL_CAMERA);
EEEPC_CREATE_DEVICE_ATTR_RW(cardr, CM_ASL_CARDREADER);
EEEPC_CREATE_DEVICE_ATTR_WO(disp, 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);
        if (c->cur < 0)
                return -ENODEV;

        c->num = (c->cur >> 8) & 0xff;
        c->cur &= 0xff;
        if (c->num == 0 || c->num > 12)
                return -ENODEV;
        return 0;
}

static ssize_t available_cpufv_show(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 cpufv_show(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 cpufv_store(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, &value);
        if (rv < 0)
                return rv;
        if (value < 0 || value >= c.num)
                return -EINVAL;
        rv = set_acpi(eeepc, CM_ASL_CPUFV, value);
        if (rv)
                return rv;
        return count;
}

static ssize_t cpufv_disabled_show(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 cpufv_disabled_store(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, &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 count;
        case 1:
                return -EPERM;
        default:
                return -EINVAL;
        }
}


static DEVICE_ATTR_RW(cpufv);
static DEVICE_ATTR_RO(available_cpufv);
static DEVICE_ATTR_RW(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 const 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);
        pci_lock_rescan_remove();

        if (!eeepc->hotplug_slot)
                goto out_unlock;

        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);
                        pci_bus_add_device(dev);
                }
        } 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:
        pci_unlock_rescan_remove();
        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_FAILURE(status))
                return -ENODEV;

        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);
        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_FAILURE(status))
                return;

        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 char EEEPC_RFKILL_NODE_1[] = "\\_SB.PCI0.P0P5";
static char EEEPC_RFKILL_NODE_2[] = "\\_SB.PCI0.P0P6";
static char EEEPC_RFKILL_NODE_3[] = "\\_SB.PCI0.P0P7";

static void eeepc_rfkill_exit(struct eeepc_laptop *eeepc)
{
        eeepc_unregister_rfkill_notifier(eeepc, EEEPC_RFKILL_NODE_1);
        eeepc_unregister_rfkill_notifier(eeepc, EEEPC_RFKILL_NODE_2);
        eeepc_unregister_rfkill_notifier(eeepc, EEEPC_RFKILL_NODE_3);
        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, EEEPC_RFKILL_NODE_1);
        eeepc_register_rfkill_notifier(eeepc, EEEPC_RFKILL_NODE_2);
        eeepc_register_rfkill_notifier(eeepc, EEEPC_RFKILL_NODE_3);

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) {
                int 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);
                if (wlan >= 0)
                        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, EEEPC_RFKILL_NODE_1);
                eeepc_rfkill_hotplug_update(eeepc, EEEPC_RFKILL_NODE_2);
                eeepc_rfkill_hotplug_update(eeepc, EEEPC_RFKILL_NODE_3);
        }

        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,
                .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 inline int eeepc_pwm_to_lmsensors(int value)
{
        return value * 255 / 100;
}

static inline int eeepc_lmsensors_to_pwm(int value)
{
        value = clamp_val(value, 0, 255);
        return value * 100 / 255;
}

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

        ec_read(EEEPC_EC_FAN_PWM, &value);
        return eeepc_pwm_to_lmsensors(value);
}

static void eeepc_set_fan_pwm(int value)
{
        value = eeepc_lmsensors_to_pwm(value);
        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;
}

#define EEEPC_EC_FAN_CTRL_BIT   0x02
#define EEEPC_FAN_CTRL_MANUAL   1
#define EEEPC_FAN_CTRL_AUTO     2

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

        ec_read(EEEPC_EC_FAN_CTRL, &value);
        if (value & EEEPC_EC_FAN_CTRL_BIT)
                return EEEPC_FAN_CTRL_MANUAL;
        else
                return EEEPC_FAN_CTRL_AUTO;
}

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

        ec_read(EEEPC_EC_FAN_CTRL, &value);
        if (manual == EEEPC_FAN_CTRL_MANUAL)
                value |= EEEPC_EC_FAN_CTRL_BIT;
        else
                value &= ~EEEPC_EC_FAN_CTRL_BIT;
        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, &value);
        if (rv < 0)
                return rv;
        set(value);
        return count;
}

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

#define EEEPC_SENSOR_SHOW_FUNC(_name, _get)                             \
        static ssize_t _name##_show(struct device *dev,                 \
                                    struct device_attribute *attr,      \
                                    char *buf)                          \
        {                                                               \
                return show_sys_hwmon(_get, buf);                       \
        }

#define EEEPC_SENSOR_STORE_FUNC(_name, _set)                            \
        static ssize_t _name##_store(struct device *dev,                \
                                     struct device_attribute *attr,     \
                                     const char *buf, size_t count)     \
        {                                                               \
                return store_sys_hwmon(_set, buf, count);               \
        }

#define EEEPC_CREATE_SENSOR_ATTR_RW(_name, _get, _set)                  \
        EEEPC_SENSOR_SHOW_FUNC(_name, _get)                             \
        EEEPC_SENSOR_STORE_FUNC(_name, _set)                            \
        static DEVICE_ATTR_RW(_name)

#define EEEPC_CREATE_SENSOR_ATTR_RO(_name, _get)                        \
        EEEPC_SENSOR_SHOW_FUNC(_name, _get)                             \
        static DEVICE_ATTR_RO(_name)

EEEPC_CREATE_SENSOR_ATTR_RO(fan1_input, eeepc_get_fan_rpm);
EEEPC_CREATE_SENSOR_ATTR_RW(pwm1, eeepc_get_fan_pwm,
                            eeepc_set_fan_pwm);
EEEPC_CREATE_SENSOR_ATTR_RW(pwm1_enable, eeepc_get_fan_ctrl,
                            eeepc_set_fan_ctrl);

static struct attribute *hwmon_attrs[] = {
        &dev_attr_pwm1.attr,
        &dev_attr_fan1_input.attr,
        &dev_attr_pwm1_enable.attr,
        NULL
};
ATTRIBUTE_GROUPS(hwmon);

static int eeepc_hwmon_init(struct eeepc_laptop *eeepc)
{
        struct device *dev = &eeepc->platform_device->dev;
        struct device *hwmon;

        hwmon = devm_hwmon_device_register_with_groups(dev, "eeepc", NULL,
                                                       hwmon_groups);
        if (IS_ERR(hwmon)) {
                pr_err("Could not register eeepc hwmon device\n");
                return PTR_ERR(hwmon);
        }
        return 0;
}

/*
 * 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)
{
        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)
                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_dev;
        }

        eeepc->inputdev = input;
        return 0;

err_free_dev:
        input_free_device(input);
        return error;
}

static void eeepc_input_exit(struct eeepc_laptop *eeepc)
{
        if (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);
        int old_brightness, new_brightness;
        u16 count;

        if (event > ACPI_MAX_SYS_NOTIFY)
                return;
        count = eeepc->event_count[event % 128]++;
        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) {
                eeepc_input_notify(eeepc, event);
                return;
        }

        /* Ignore them completely if the acpi video driver is used */
        if (!eeepc->backlight_device)
                return;

        /* 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);
}

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 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 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 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_get_backlight_type() == acpi_backlight_vendor) {
                result = eeepc_backlight_init(eeepc);
                if (result)
                        goto fail_backlight;
        }

        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:
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)
{
        struct eeepc_laptop *eeepc = acpi_driver_data(device);

        eeepc_backlight_exit(eeepc);
        eeepc_rfkill_exit(eeepc);
        eeepc_input_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);