eeepc-laptop: code movement

[mirror_ubuntu-bionic-kernel.git] / drivers / platform / x86 / eeepc-laptop.c

/*
 *  eepc-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 <acpi/acpi_drivers.h>
#include <acpi/acpi_bus.h>
#include <linux/uaccess.h>
#include <linux/input.h>
#include <linux/rfkill.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <linux/leds.h>

#define EEEPC_LAPTOP_VERSION    "0.1"

#define EEEPC_HOTK_NAME         "Eee PC Hotkey Driver"
#define EEEPC_HOTK_FILE         "eeepc"
#define EEEPC_HOTK_CLASS        "hotkey"
#define EEEPC_HOTK_DEVICE_NAME  "Hotkey"
#define EEEPC_HOTK_HID          "ASUS010"

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

/*
 * Definitions for Asus EeePC
 */
#define NOTIFY_WLAN_ON  0x10
#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"
};

struct key_entry {
        char type;
        u8 code;
        u16 keycode;
};

enum { KE_KEY, KE_END };

static struct key_entry eeepc_keymap[] = {
        /* Sleep already handled via generic ACPI code */
        {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, 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_END, 0},
};


/*
 * This is the main structure, we can use it to store useful information
 * about the hotk device
 */
struct eeepc_hotk {
        struct acpi_device *device;     /* the device we are in */
        acpi_handle handle;             /* the handle of the hotk device */
        u32 cm_supported;               /* the control methods supported
                                           by this BIOS */
        u16 event_count[128];           /* count for each event */
        struct input_dev *inputdev;
        u16 *keycode_map;
        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;
};

/* The actual device the driver binds to */
static struct eeepc_hotk *ehotk;

/* The platform device */
static struct platform_device *platform_device;

/* The backlight device /sys/class/backlight */
static struct backlight_device *eeepc_backlight_device;

/* The hwmon device */
static struct device *eeepc_hwmon_device;


/*
 * 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(int cm, int value)
{
        const char *method = cm_setv[cm];

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

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

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

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

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

/*
 * 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(int cm, const char *buf, size_t count)
{
        int rv, value;

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

static ssize_t show_sys_acpi(int cm, char *buf)
{
        int value = get_acpi(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(_cm, buf);                         \
        }                                                               \
        static ssize_t store_##_name(struct device *dev,                \
                                     struct device_attribute *attr,     \
                                     const char *buf, size_t count)     \
        {                                                               \
                return store_sys_acpi(_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_cpufv *c)
{
        c->cur = get_acpi(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_cpufv c;
        int i;
        ssize_t len = 0;

        if (get_cpufv(&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_cpufv c;

        if (get_cpufv(&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_cpufv c;
        int rv, value;

        if (get_cpufv(&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(CM_ASL_CPUFV, value);
        return rv;
}

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

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

static int eeepc_platform_init(void)
{
        int result;

        platform_device = platform_device_alloc(EEEPC_HOTK_FILE, -1);
        if (!platform_device)
                return -ENOMEM;

        result = platform_device_add(platform_device);
        if (result)
                goto fail_platform_device;

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

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

static void eeepc_platform_exit(void)
{
        sysfs_remove_group(&platform_device->dev.kobj,
                           &platform_attribute_group);
        platform_device_unregister(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 int tpd_led_wk;

static void tpd_led_update(struct work_struct *ignored)
{
        int value = tpd_led_wk;
        set_acpi(CM_ASL_TPD, value);
}

static struct workqueue_struct *led_workqueue;
static DECLARE_WORK(tpd_led_work, tpd_led_update);

static void tpd_led_set(struct led_classdev *led_cdev,
                        enum led_brightness value)
{
        tpd_led_wk = (value > 0) ? 1 : 0;
        queue_work(led_workqueue, &tpd_led_work);
}

static struct led_classdev tpd_led = {
        .name           = "eeepc::touchpad",
        .brightness_set = tpd_led_set,
        .max_brightness = 1
};

static int eeepc_led_init(struct device *dev)
{
        int rv;

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

        led_workqueue = create_singlethread_workqueue("led_workqueue");
        if (!led_workqueue)
                return -ENOMEM;

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

        return 0;
}

static void eeepc_led_exit(void)
{
        if (tpd_led.dev)
                led_classdev_unregister(&tpd_led);
        if (led_workqueue)
                destroy_workqueue(led_workqueue);
}


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

static void eeepc_rfkill_hotplug(void)
{
        struct pci_dev *dev;
        struct pci_bus *bus;
        bool blocked = eeepc_wlan_rfkill_blocked();

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

        mutex_lock(&ehotk->hotplug_lock);

        if (ehotk->hotplug_slot) {
                bus = pci_find_bus(0, 1);
                if (!bus) {
                        pr_warning("Unable to find PCI bus 1?\n");
                        goto out_unlock;
                }

                if (!blocked) {
                        dev = pci_get_slot(bus, 0);
                        if (dev) {
                                /* Device already present */
                                pci_dev_put(dev);
                                goto out_unlock;
                        }
                        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_remove_bus_device(dev);
                                pci_dev_put(dev);
                        }
                }
        }

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

static void eeepc_rfkill_notify(acpi_handle handle, u32 event, void *data)
{
        if (event != ACPI_NOTIFY_BUS_CHECK)
                return;

        eeepc_rfkill_hotplug();
}

static int eeepc_register_rfkill_notifier(char *node)
{
        acpi_status status = AE_OK;
        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,
                                                     NULL);
                if (ACPI_FAILURE(status))
                        pr_warning("Failed to register notify on %s\n", node);
        } else
                return -ENODEV;

        return 0;
}

static void eeepc_unregister_rfkill_notifier(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);
        }
}

static int eeepc_get_adapter_status(struct hotplug_slot *hotplug_slot,
                                    u8 *value)
{
        int val = get_acpi(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(void)
{
        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;
        }

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

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

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

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

/*
 * Rfkill devices
 */
static int eeepc_rfkill_set(void *data, bool blocked)
{
        unsigned long asl = (unsigned long)data;
        return set_acpi(asl, !blocked);
}

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

static int eeepc_new_rfkill(struct rfkill **rfkill,
                            const char *name, struct device *dev,
                            enum rfkill_type type, int cm)
{
        int result;

        result = get_acpi(cm);
        if (result < 0)
                return result;

        *rfkill = rfkill_alloc(name, dev, type,
                               &eeepc_rfkill_ops, (void *)(unsigned long)cm);

        if (!*rfkill)
                return -EINVAL;

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

static void eeepc_rfkill_exit(void)
{
        eeepc_unregister_rfkill_notifier("\\_SB.PCI0.P0P5");
        eeepc_unregister_rfkill_notifier("\\_SB.PCI0.P0P6");
        eeepc_unregister_rfkill_notifier("\\_SB.PCI0.P0P7");
        if (ehotk->wlan_rfkill) {
                rfkill_unregister(ehotk->wlan_rfkill);
                rfkill_destroy(ehotk->wlan_rfkill);
                ehotk->wlan_rfkill = NULL;
        }
        /*
         * Refresh pci hotplug in case the rfkill state was changed after
         * eeepc_unregister_rfkill_notifier()
         */
        eeepc_rfkill_hotplug();
        if (ehotk->hotplug_slot)
                pci_hp_deregister(ehotk->hotplug_slot);

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

static int eeepc_rfkill_init(struct device *dev)
{
        int result = 0;

        mutex_init(&ehotk->hotplug_lock);

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

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

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

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

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

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

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

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

        result = eeepc_setup_pci_hotplug();
        /*
         * 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("\\_SB.PCI0.P0P5");
        eeepc_register_rfkill_notifier("\\_SB.PCI0.P0P6");
        eeepc_register_rfkill_notifier("\\_SB.PCI0.P0P7");
        /*
         * Refresh pci hotplug in case the rfkill state was changed during
         * setup.
         */
        eeepc_rfkill_hotplug();

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

/*
 * Platform driver - hibernate/resume callbacks
 */
static int eeepc_hotk_thaw(struct device *device)
{
        if (ehotk->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(CM_ASL_WLAN);
                set_acpi(CM_ASL_WLAN, wlan);
        }

        return 0;
}

static int eeepc_hotk_restore(struct device *device)
{
        /* Refresh both wlan rfkill state and pci hotplug */
        if (ehotk->wlan_rfkill)
                eeepc_rfkill_hotplug();

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

        return 0;
}

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

static struct platform_driver platform_driver = {
        .driver = {
                .name = EEEPC_HOTK_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(void)
{
        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 device *dev)
{
        struct device *hwmon;
        int result;

        hwmon = hwmon_device_register(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();
        return result;
}

/*
 * Backlight device
 */
static int read_brightness(struct backlight_device *bd)
{
        return get_acpi(CM_ASL_PANELBRIGHT);
}

static int set_brightness(struct backlight_device *bd, int value)
{
        return set_acpi(CM_ASL_PANELBRIGHT, value);
}

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

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

static int eeepc_backlight_notify(void)
{
        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 device *dev)
{
        struct backlight_device *bd;

        bd = backlight_device_register(EEEPC_HOTK_FILE, dev,
                                       NULL, &eeepcbl_ops);
        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.max_brightness = 15;
        bd->props.brightness = read_brightness(NULL);
        bd->props.power = FB_BLANK_UNBLANK;
        backlight_update_status(bd);
        return 0;
}

static void eeepc_backlight_exit(void)
{
        if (eeepc_backlight_device)
                backlight_device_unregister(eeepc_backlight_device);
        eeepc_backlight_device = NULL;
}


/*
 * Input device (i.e. hotkeys)
 */
static struct key_entry *eeepc_get_entry_by_scancode(int code)
{
        struct key_entry *key;

        for (key = eeepc_keymap; key->type != KE_END; key++)
                if (code == key->code)
                        return key;

        return NULL;
}

static void eeepc_input_notify(int event)
{
        static struct key_entry *key;

        key = eeepc_get_entry_by_scancode(event);
        if (key) {
                switch (key->type) {
                case KE_KEY:
                        input_report_key(ehotk->inputdev, key->keycode,
                                                1);
                        input_sync(ehotk->inputdev);
                        input_report_key(ehotk->inputdev, key->keycode,
                                                0);
                        input_sync(ehotk->inputdev);
                        break;
                }
        }
}

static struct key_entry *eepc_get_entry_by_keycode(int code)
{
        struct key_entry *key;

        for (key = eeepc_keymap; key->type != KE_END; key++)
                if (code == key->keycode && key->type == KE_KEY)
                        return key;

        return NULL;
}

static int eeepc_getkeycode(struct input_dev *dev, int scancode, int *keycode)
{
        struct key_entry *key = eeepc_get_entry_by_scancode(scancode);

        if (key && key->type == KE_KEY) {
                *keycode = key->keycode;
                return 0;
        }

        return -EINVAL;
}

static int eeepc_setkeycode(struct input_dev *dev, int scancode, int keycode)
{
        struct key_entry *key;
        int old_keycode;

        if (keycode < 0 || keycode > KEY_MAX)
                return -EINVAL;

        key = eeepc_get_entry_by_scancode(scancode);
        if (key && key->type == KE_KEY) {
                old_keycode = key->keycode;
                key->keycode = keycode;
                set_bit(keycode, dev->keybit);
                if (!eepc_get_entry_by_keycode(old_keycode))
                        clear_bit(old_keycode, dev->keybit);
                return 0;
        }

        return -EINVAL;
}

static int eeepc_input_init(struct device *dev)
{
        const struct key_entry *key;
        int result;

        ehotk->inputdev = input_allocate_device();
        if (!ehotk->inputdev) {
                pr_info("Unable to allocate input device\n");
                return -ENOMEM;
        }
        ehotk->inputdev->name = "Asus EeePC extra buttons";
        ehotk->inputdev->dev.parent = dev;
        ehotk->inputdev->phys = EEEPC_HOTK_FILE "/input0";
        ehotk->inputdev->id.bustype = BUS_HOST;
        ehotk->inputdev->getkeycode = eeepc_getkeycode;
        ehotk->inputdev->setkeycode = eeepc_setkeycode;

        for (key = eeepc_keymap; key->type != KE_END; key++) {
                switch (key->type) {
                case KE_KEY:
                        set_bit(EV_KEY, ehotk->inputdev->evbit);
                        set_bit(key->keycode, ehotk->inputdev->keybit);
                        break;
                }
        }
        result = input_register_device(ehotk->inputdev);
        if (result) {
                pr_info("Unable to register input device\n");
                input_free_device(ehotk->inputdev);
                return result;
        }
        return 0;
}

static void eeepc_input_exit(void)
{
        if (ehotk->inputdev)
                input_unregister_device(ehotk->inputdev);
}

/*
 * ACPI driver
 */
static void eeepc_hotk_notify(struct acpi_device *device, u32 event)
{
        u16 count;

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

        if (event >= NOTIFY_BRN_MIN && event <= NOTIFY_BRN_MAX) {
                int old_brightness, new_brightness;

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

                /* Convert brightness 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(event);
}

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

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

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

static int eeepc_hotk_init(void)
{
        unsigned int init_flags;
        int result;

        result = acpi_bus_get_status(ehotk->device);
        if (result)
                return result;
        if (!ehotk->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(ehotk->handle, "INIT", init_flags)) {
                pr_err("Hotkey initialization failed\n");
                return -ENODEV;
        }

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

        return 0;
}

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

static int __devinit eeepc_hotk_add(struct acpi_device *device)
{
        struct device *dev;
        int result;

        pr_notice(EEEPC_HOTK_NAME "\n");
        ehotk = kzalloc(sizeof(struct eeepc_hotk), GFP_KERNEL);
        if (!ehotk)
                return -ENOMEM;
        ehotk->handle = device->handle;
        strcpy(acpi_device_name(device), EEEPC_HOTK_DEVICE_NAME);
        strcpy(acpi_device_class(device), EEEPC_HOTK_CLASS);
        device->driver_data = ehotk;
        ehotk->device = device;

        result = eeepc_hotk_init();
        if (result)
                goto fail_platform;
        eeepc_enable_camera();

        result = eeepc_platform_init();
        if (result)
                goto fail_platform;

        dev = &platform_device->dev;

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

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

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

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

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

        return 0;

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

        return result;
}

static int eeepc_hotk_remove(struct acpi_device *device, int type)
{
        eeepc_backlight_exit();
        eeepc_rfkill_exit();
        eeepc_input_exit();
        eeepc_hwmon_exit();
        eeepc_led_exit();
        eeepc_platform_exit();

        kfree(ehotk);
        return 0;
}


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

static struct acpi_driver eeepc_hotk_driver = {
        .name = EEEPC_HOTK_NAME,
        .class = EEEPC_HOTK_CLASS,
        .owner = THIS_MODULE,
        .ids = eeepc_device_ids,
        .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
        .ops = {
                .add = eeepc_hotk_add,
                .remove = eeepc_hotk_remove,
                .notify = eeepc_hotk_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_hotk_driver);
        if (result < 0)
                goto fail_acpi_driver;
        if (!ehotk) {
                result = -ENODEV;
                goto fail_no_device;
        }
        return 0;

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

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

module_init(eeepc_laptop_init);
module_exit(eeepc_laptop_exit);