xref: /freebsd/sys/dev/acpi_support/acpi_asus_wmi.c (revision 027b93c2f5e1b84d9e4569f127b632c704c53b73)

/*-
 * Copyright (c) 2012 Alexander Motin <mav@FreeBSD.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#include "opt_acpi.h"
#include "opt_evdev.h"
#include <sys/param.h>
#include <sys/conf.h>
#include <sys/uio.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/bus.h>
#include <sys/sbuf.h>
#include <sys/module.h>
#include <sys/sysctl.h>

#include <contrib/dev/acpica/include/acpi.h>
#include <contrib/dev/acpica/include/accommon.h>
#include <dev/acpica/acpivar.h>
#include "acpi_wmi_if.h"

#include <dev/backlight/backlight.h>
#include "backlight_if.h"

#ifdef EVDEV_SUPPORT
#include <dev/evdev/input.h>
#include <dev/evdev/evdev.h>
#define NO_KEY	KEY_RESERVED
#endif

#define _COMPONENT	ACPI_OEM
ACPI_MODULE_NAME("ASUS-WMI")

#define ACPI_ASUS_WMI_MGMT_GUID 	"97845ED0-4E6D-11DE-8A39-0800200C9A66"
#define ACPI_ASUS_WMI_EVENT_GUID	"0B3CBB35-E3C2-45ED-91C2-4C5A6D195D1C"
#define ACPI_EEEPC_WMI_EVENT_GUID	"ABBC0F72-8EA1-11D1-00A0-C90629100000"

/* WMI Methods */
#define ASUS_WMI_METHODID_SPEC          0x43455053
#define ASUS_WMI_METHODID_SFUN          0x4E554653
#define ASUS_WMI_METHODID_DSTS          0x53544344
#define ASUS_WMI_METHODID_DSTS2         0x53545344
#define ASUS_WMI_METHODID_DEVS          0x53564544
#define ASUS_WMI_METHODID_INIT          0x54494E49
#define ASUS_WMI_METHODID_HKEY          0x59454B48

#define ASUS_WMI_UNSUPPORTED_METHOD     0xFFFFFFFE

/* Wireless */
#define ASUS_WMI_DEVID_HW_SWITCH        0x00010001
#define ASUS_WMI_DEVID_WIRELESS_LED     0x00010002
#define ASUS_WMI_DEVID_CWAP             0x00010003
#define ASUS_WMI_DEVID_WLAN             0x00010011
#define ASUS_WMI_DEVID_BLUETOOTH        0x00010013
#define ASUS_WMI_DEVID_GPS              0x00010015
#define ASUS_WMI_DEVID_WIMAX            0x00010017
#define ASUS_WMI_DEVID_WWAN3G           0x00010019
#define ASUS_WMI_DEVID_UWB              0x00010021

/* LEDs */
#define ASUS_WMI_DEVID_LED1             0x00020011
#define ASUS_WMI_DEVID_LED2             0x00020012
#define ASUS_WMI_DEVID_LED3             0x00020013
#define ASUS_WMI_DEVID_LED4             0x00020014
#define ASUS_WMI_DEVID_LED5             0x00020015
#define ASUS_WMI_DEVID_LED6             0x00020016

/* Backlight and Brightness */
#define ASUS_WMI_DEVID_BACKLIGHT        0x00050011
#define ASUS_WMI_DEVID_BRIGHTNESS       0x00050012
#define ASUS_WMI_DEVID_KBD_BACKLIGHT    0x00050021
#define ASUS_WMI_DEVID_LIGHT_SENSOR     0x00050022

/* Misc */
#define ASUS_WMI_DEVID_CAMERA           0x00060013
#define ASUS_WMI_DEVID_CARDREADER       0x00080013
#define ASUS_WMI_DEVID_TOUCHPAD         0x00100011
#define ASUS_WMI_DEVID_TOUCHPAD_LED     0x00100012
#define ASUS_WMI_DEVID_TUF_RGB_MODE	0x00100056
#define ASUS_WMI_DEVID_THERMAL_CTRL     0x00110011
#define ASUS_WMI_DEVID_FAN_CTRL         0x00110012
#define ASUS_WMI_DEVID_PROCESSOR_STATE  0x00120012
#define ASUS_WMI_DEVID_THROTTLE_THERMAL_POLICY 0x00120075

/* DSTS masks */
#define ASUS_WMI_DSTS_STATUS_BIT        0x00000001
#define ASUS_WMI_DSTS_UNKNOWN_BIT       0x00000002
#define ASUS_WMI_DSTS_PRESENCE_BIT      0x00010000
#define ASUS_WMI_DSTS_USER_BIT          0x00020000
#define ASUS_WMI_DSTS_BIOS_BIT          0x00040000
#define ASUS_WMI_DSTS_BRIGHTNESS_MASK   0x000000FF
#define ASUS_WMI_DSTS_MAX_BRIGTH_MASK   0x0000FF00

/* Events */
#define ASUS_WMI_EVENT_QUEUE_SIZE	0x10
#define ASUS_WMI_EVENT_QUEUE_END	0x1
#define ASUS_WMI_EVENT_MASK		0xFFFF
#define ASUS_WMI_EVENT_VALUE_ATK	0xFF

struct acpi_asus_wmi_softc {
	device_t	dev;
	device_t	wmi_dev;
	const char	*notify_guid;
	struct sysctl_ctx_list	*sysctl_ctx;
	struct sysctl_oid	*sysctl_tree;
	int		dsts_id;
	int		handle_keys;
	bool		event_queue;
	struct cdev	*kbd_bkl;
	uint32_t	kbd_bkl_level;
	uint32_t	tuf_rgb_mode;
	uint32_t	ttp_mode;
#ifdef EVDEV_SUPPORT
	struct evdev_dev	*evdev;
#endif
};

static struct {
	char	*name;
	int	dev_id;
	char	*description;
	int	flag_rdonly;
} acpi_asus_wmi_sysctls[] = {
	{
		.name		= "hw_switch",
		.dev_id		= ASUS_WMI_DEVID_HW_SWITCH,
		.description	= "hw_switch",
	},
	{
		.name		= "wireless_led",
		.dev_id		= ASUS_WMI_DEVID_WIRELESS_LED,
		.description	= "Wireless LED control",
	},
	{
		.name		= "cwap",
		.dev_id		= ASUS_WMI_DEVID_CWAP,
		.description	= "Alt+F2 function",
	},
	{
		.name		= "wlan",
		.dev_id		= ASUS_WMI_DEVID_WLAN,
		.description	= "WLAN power control",
	},
	{
		.name		= "bluetooth",
		.dev_id		= ASUS_WMI_DEVID_BLUETOOTH,
		.description	= "Bluetooth power control",
	},
	{
		.name		= "gps",
		.dev_id		= ASUS_WMI_DEVID_GPS,
		.description	= "GPS power control",
	},
	{
		.name		= "wimax",
		.dev_id		= ASUS_WMI_DEVID_WIMAX,
		.description	= "WiMAX power control",
	},
	{
		.name		= "wwan3g",
		.dev_id		= ASUS_WMI_DEVID_WWAN3G,
		.description	= "WWAN-3G power control",
	},
	{
		.name		= "uwb",
		.dev_id		= ASUS_WMI_DEVID_UWB,
		.description	= "UWB power control",
	},
	{
		.name		= "led1",
		.dev_id		= ASUS_WMI_DEVID_LED1,
		.description	= "LED1 control",
	},
	{
		.name		= "led2",
		.dev_id		= ASUS_WMI_DEVID_LED2,
		.description	= "LED2 control",
	},
	{
		.name		= "led3",
		.dev_id		= ASUS_WMI_DEVID_LED3,
		.description	= "LED3 control",
	},
	{
		.name		= "led4",
		.dev_id		= ASUS_WMI_DEVID_LED4,
		.description	= "LED4 control",
	},
	{
		.name		= "led5",
		.dev_id		= ASUS_WMI_DEVID_LED5,
		.description	= "LED5 control",
	},
	{
		.name		= "led6",
		.dev_id		= ASUS_WMI_DEVID_LED6,
		.description	= "LED6 control",
	},
	{
		.name		= "backlight",
		.dev_id		= ASUS_WMI_DEVID_BACKLIGHT,
		.description	= "LCD backlight on/off control",
	},
	{
		.name		= "brightness",
		.dev_id		= ASUS_WMI_DEVID_BRIGHTNESS,
		.description	= "LCD backlight brightness control",
	},
	{
		.name		= "kbd_backlight",
		.dev_id		= ASUS_WMI_DEVID_KBD_BACKLIGHT,
		.description	= "Keyboard backlight brightness control",
	},
	{
		.name		= "light_sensor",
		.dev_id		= ASUS_WMI_DEVID_LIGHT_SENSOR,
		.description	= "Ambient light sensor",
	},
	{
		.name		= "camera",
		.dev_id		= ASUS_WMI_DEVID_CAMERA,
		.description	= "Camera power control",
	},
	{
		.name		= "cardreader",
		.dev_id		= ASUS_WMI_DEVID_CARDREADER,
		.description	= "Cardreader power control",
	},
	{
		.name		= "touchpad",
		.dev_id		= ASUS_WMI_DEVID_TOUCHPAD,
		.description	= "Touchpad control",
	},
	{
		.name		= "touchpad_led",
		.dev_id		= ASUS_WMI_DEVID_TOUCHPAD_LED,
		.description	= "Touchpad LED control",
	},
	{
		.name		= "themperature",
		.dev_id		= ASUS_WMI_DEVID_THERMAL_CTRL,
		.description	= "Temperature (C)",
		.flag_rdonly	= 1
	},
	{
		.name		= "fan_speed",
		.dev_id		= ASUS_WMI_DEVID_FAN_CTRL,
		.description	= "Fan speed (0-3)",
		.flag_rdonly	= 1
	},
	{
		.name		= "processor_state",
		.dev_id		= ASUS_WMI_DEVID_PROCESSOR_STATE,
		.flag_rdonly	= 1
	},
	{
		.name		= "throttle_thermal_policy",
		.dev_id		= ASUS_WMI_DEVID_THROTTLE_THERMAL_POLICY,
		.description	= "Throttle Thermal Policy "
				  "(0 - default, 1 - overboost, 2 - silent)",
	},
	{ NULL, 0, NULL, 0 }
};

#ifdef EVDEV_SUPPORT
static const struct {
	UINT32		notify;
	uint16_t	key;
} acpi_asus_wmi_evdev_map[] = {
	{ 0x20, KEY_BRIGHTNESSDOWN },
	{ 0x2f, KEY_BRIGHTNESSUP },
	{ 0x30, KEY_VOLUMEUP },
	{ 0x31, KEY_VOLUMEDOWN },
	{ 0x32, KEY_MUTE },
	{ 0x35, KEY_SCREENLOCK },
	{ 0x38, KEY_PROG3 },		/* Armoury Crate */
	{ 0x40, KEY_PREVIOUSSONG },
	{ 0x41, KEY_NEXTSONG },
	{ 0x43, KEY_STOPCD },		/* Stop/Eject */
	{ 0x45, KEY_PLAYPAUSE },
	{ 0x4f, KEY_LEFTMETA },		/* Fn-locked "Windows" Key */
	{ 0x4c, KEY_MEDIA },		/* WMP Key */
	{ 0x50, KEY_EMAIL },
	{ 0x51, KEY_WWW },
	{ 0x55, KEY_CALC },
	{ 0x57, NO_KEY },		/* Battery mode */
	{ 0x58, NO_KEY },		/* AC mode */
	{ 0x5C, KEY_F15 },		/* Power Gear key */
	{ 0x5D, KEY_WLAN },		/* Wireless console Toggle */
	{ 0x5E, KEY_WLAN },		/* Wireless console Enable */
	{ 0x5F, KEY_WLAN },		/* Wireless console Disable */
	{ 0x60, KEY_TOUCHPAD_ON },
	{ 0x61, KEY_SWITCHVIDEOMODE },	/* SDSP LCD only */
	{ 0x62, KEY_SWITCHVIDEOMODE },	/* SDSP CRT only */
	{ 0x63, KEY_SWITCHVIDEOMODE },	/* SDSP LCD + CRT */
	{ 0x64, KEY_SWITCHVIDEOMODE },	/* SDSP TV */
	{ 0x65, KEY_SWITCHVIDEOMODE },	/* SDSP LCD + TV */
	{ 0x66, KEY_SWITCHVIDEOMODE },	/* SDSP CRT + TV */
	{ 0x67, KEY_SWITCHVIDEOMODE },	/* SDSP LCD + CRT + TV */
	{ 0x6B, KEY_TOUCHPAD_TOGGLE },
	{ 0x6E, NO_KEY },		/* Low Battery notification */
	{ 0x71, KEY_F13 },		/* General-purpose button */
	{ 0x79, NO_KEY },	/* Charger type dectection notification */
	{ 0x7a, KEY_ALS_TOGGLE },	/* Ambient Light Sensor Toggle */
	{ 0x7c, KEY_MICMUTE },
	{ 0x7D, KEY_BLUETOOTH },	/* Bluetooth Enable */
	{ 0x7E, KEY_BLUETOOTH },	/* Bluetooth Disable */
	{ 0x82, KEY_CAMERA },
	{ 0x86, KEY_PROG1 },		/* MyASUS Key */
	{ 0x88, KEY_RFKILL },		/* Radio Toggle Key */
	{ 0x8A, KEY_PROG1 },		/* Color enhancement mode */
	{ 0x8C, KEY_SWITCHVIDEOMODE },	/* SDSP DVI only */
	{ 0x8D, KEY_SWITCHVIDEOMODE },	/* SDSP LCD + DVI */
	{ 0x8E, KEY_SWITCHVIDEOMODE },	/* SDSP CRT + DVI */
	{ 0x8F, KEY_SWITCHVIDEOMODE },	/* SDSP TV + DVI */
	{ 0x90, KEY_SWITCHVIDEOMODE },	/* SDSP LCD + CRT + DVI */
	{ 0x91, KEY_SWITCHVIDEOMODE },	/* SDSP LCD + TV + DVI */
	{ 0x92, KEY_SWITCHVIDEOMODE },	/* SDSP CRT + TV + DVI */
	{ 0x93, KEY_SWITCHVIDEOMODE },	/* SDSP LCD + CRT + TV + DVI */
	{ 0x95, KEY_MEDIA },
	{ 0x99, KEY_PHONE },		/* Conflicts with fan mode switch */
	{ 0xA0, KEY_SWITCHVIDEOMODE },	/* SDSP HDMI only */
	{ 0xA1, KEY_SWITCHVIDEOMODE },	/* SDSP LCD + HDMI */
	{ 0xA2, KEY_SWITCHVIDEOMODE },	/* SDSP CRT + HDMI */
	{ 0xA3, KEY_SWITCHVIDEOMODE },	/* SDSP TV + HDMI */
	{ 0xA4, KEY_SWITCHVIDEOMODE },	/* SDSP LCD + CRT + HDMI */
	{ 0xA5, KEY_SWITCHVIDEOMODE },	/* SDSP LCD + TV + HDMI */
	{ 0xA6, KEY_SWITCHVIDEOMODE },	/* SDSP CRT + TV + HDMI */
	{ 0xA7, KEY_SWITCHVIDEOMODE },	/* SDSP LCD + CRT + TV + HDMI */
	{ 0xAE, KEY_FN_F5 },		/* Fn+F5 fan mode on 2020+ */
	{ 0xB3, KEY_PROG4 },		/* AURA */
	{ 0xB5, KEY_CALC },
	{ 0xC4, KEY_KBDILLUMUP },
	{ 0xC5, KEY_KBDILLUMDOWN },
	{ 0xC6, NO_KEY },		/* Ambient Light Sensor notification */
	{ 0xFA, KEY_PROG2 },		/* Lid flip action */
	{ 0xBD, KEY_PROG2 },	/* Lid flip action on ROG xflow laptops */
};
#endif

ACPI_SERIAL_DECL(asus_wmi, "ASUS WMI device");

static void	acpi_asus_wmi_identify(driver_t *driver, device_t parent);
static int	acpi_asus_wmi_probe(device_t dev);
static int	acpi_asus_wmi_attach(device_t dev);
static int	acpi_asus_wmi_detach(device_t dev);
static int	acpi_asus_wmi_suspend(device_t dev);
static int	acpi_asus_wmi_resume(device_t dev);

static int	acpi_asus_wmi_sysctl(SYSCTL_HANDLER_ARGS);
static int	acpi_asus_wmi_sysctl_set(struct acpi_asus_wmi_softc *sc, int dev_id,
		    int arg, int oldarg);
static int	acpi_asus_wmi_sysctl_get(struct acpi_asus_wmi_softc *sc, int dev_id);
static int	acpi_asus_wmi_evaluate_method(device_t wmi_dev, int method,
		    UINT32 arg0, UINT32 arg1, UINT32 arg2, UINT32 *retval);
static int	acpi_wpi_asus_get_devstate(struct acpi_asus_wmi_softc *sc,
		    UINT32 dev_id, UINT32 *retval);
static int	acpi_wpi_asus_set_devstate(struct acpi_asus_wmi_softc *sc,
		    UINT32 dev_id, UINT32 ctrl_param, UINT32 *retval);
static int	acpi_asus_wmi_get_event_code(device_t wmi_dev, UINT32 notify,
		    int *code);
static void	acpi_asus_wmi_notify(ACPI_HANDLE h, UINT32 notify, void *context);
static int	acpi_asus_wmi_backlight_update_status(device_t dev,
		    struct backlight_props *props);
static int	acpi_asus_wmi_backlight_get_status(device_t dev,
		    struct backlight_props *props);
static int	acpi_asus_wmi_backlight_get_info(device_t dev,
		    struct backlight_info *info);

static device_method_t acpi_asus_wmi_methods[] = {
	/* Device interface */
	DEVMETHOD(device_identify, acpi_asus_wmi_identify),
	DEVMETHOD(device_probe, acpi_asus_wmi_probe),
	DEVMETHOD(device_attach, acpi_asus_wmi_attach),
	DEVMETHOD(device_detach, acpi_asus_wmi_detach),
	DEVMETHOD(device_suspend, acpi_asus_wmi_suspend),
	DEVMETHOD(device_resume, acpi_asus_wmi_resume),

	/* Backlight interface */
        DEVMETHOD(backlight_update_status, acpi_asus_wmi_backlight_update_status),
        DEVMETHOD(backlight_get_status, acpi_asus_wmi_backlight_get_status),
        DEVMETHOD(backlight_get_info, acpi_asus_wmi_backlight_get_info),

	DEVMETHOD_END
};

static driver_t	acpi_asus_wmi_driver = {
	"acpi_asus_wmi",
	acpi_asus_wmi_methods,
	sizeof(struct acpi_asus_wmi_softc),
};

DRIVER_MODULE(acpi_asus_wmi, acpi_wmi, acpi_asus_wmi_driver, 0, 0);
MODULE_DEPEND(acpi_asus_wmi, acpi_wmi, 1, 1, 1);
MODULE_DEPEND(acpi_asus_wmi, acpi, 1, 1, 1);
MODULE_DEPEND(acpi_asus_wmi, backlight, 1, 1, 1);
#ifdef EVDEV_SUPPORT
MODULE_DEPEND(acpi_asus_wmi, evdev, 1, 1, 1);
#endif

static const uint32_t acpi_asus_wmi_backlight_levels[] = { 0, 33, 66, 100 };

static inline uint32_t
devstate_to_kbd_bkl_level(UINT32 val)
{
	return (acpi_asus_wmi_backlight_levels[val & 0x3]);
}

static inline UINT32
kbd_bkl_level_to_devstate(uint32_t bkl)
{
	UINT32 val;
	int i;

	for (i = 0; i < nitems(acpi_asus_wmi_backlight_levels); i++) {
		if (bkl < acpi_asus_wmi_backlight_levels[i])
			break;
	}
	val = (i - 1) & 0x3;
	if (val != 0)
		val |= 0x80;
	return(val);
}

static void
acpi_asus_wmi_identify(driver_t *driver, device_t parent)
{

	/* Don't do anything if driver is disabled. */
	if (acpi_disabled("asus_wmi"))
		return;

	/* Add only a single device instance. */
	if (device_find_child(parent, "acpi_asus_wmi", -1) != NULL)
		return;

	/* Check management GUID to see whether system is compatible. */
	if (!ACPI_WMI_PROVIDES_GUID_STRING(parent,
	    ACPI_ASUS_WMI_MGMT_GUID))
		return;

	if (BUS_ADD_CHILD(parent, 0, "acpi_asus_wmi", -1) == NULL)
		device_printf(parent, "add acpi_asus_wmi child failed\n");
}

static int
acpi_asus_wmi_probe(device_t dev)
{

	if (!ACPI_WMI_PROVIDES_GUID_STRING(device_get_parent(dev),
	    ACPI_ASUS_WMI_MGMT_GUID))
		return (EINVAL);
	device_set_desc(dev, "ASUS WMI device");
	return (0);
}

static int
acpi_asus_wmi_attach(device_t dev)
{
	struct acpi_asus_wmi_softc	*sc;
	UINT32			val;
	int			dev_id, i, code;
	bool			have_kbd_bkl = false;

	ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__);

	sc = device_get_softc(dev);
	sc->dev = dev;
	sc->wmi_dev = device_get_parent(dev);
	sc->handle_keys = 1;

	/* Check management GUID. */
	if (!ACPI_WMI_PROVIDES_GUID_STRING(sc->wmi_dev,
	    ACPI_ASUS_WMI_MGMT_GUID)) {
		device_printf(dev,
		    "WMI device does not provide the ASUS management GUID\n");
		return (EINVAL);
	}

	/* Find proper DSTS method. */
	sc->dsts_id = ASUS_WMI_METHODID_DSTS;
next:
	for (i = 0; acpi_asus_wmi_sysctls[i].name != NULL; ++i) {
		dev_id = acpi_asus_wmi_sysctls[i].dev_id;
		if (acpi_wpi_asus_get_devstate(sc, dev_id, &val))
			continue;
		break;
	}
	if (acpi_asus_wmi_sysctls[i].name == NULL) {
		if (sc->dsts_id == ASUS_WMI_METHODID_DSTS) {
			sc->dsts_id = ASUS_WMI_METHODID_DSTS2;
			goto next;
		} else {
			device_printf(dev, "Can not detect DSTS method ID\n");
			return (EINVAL);
		}
	}

	/* Find proper and attach to notufy GUID. */
	if (ACPI_WMI_PROVIDES_GUID_STRING(sc->wmi_dev,
	    ACPI_ASUS_WMI_EVENT_GUID))
		sc->notify_guid = ACPI_ASUS_WMI_EVENT_GUID;
	else if (ACPI_WMI_PROVIDES_GUID_STRING(sc->wmi_dev,
	    ACPI_EEEPC_WMI_EVENT_GUID))
		sc->notify_guid = ACPI_EEEPC_WMI_EVENT_GUID;
	else
		sc->notify_guid = NULL;
	if (sc->notify_guid != NULL) {
		if (ACPI_WMI_INSTALL_EVENT_HANDLER(sc->wmi_dev,
		    sc->notify_guid, acpi_asus_wmi_notify, dev))
			sc->notify_guid = NULL;
	}
	if (sc->notify_guid == NULL)
		device_printf(dev, "Could not install event handler!\n");

	/* Initialize. */
	if (!acpi_asus_wmi_evaluate_method(sc->wmi_dev,
	    ASUS_WMI_METHODID_INIT, 0, 0, 0, &val) && bootverbose)
		device_printf(dev, "Initialization: %#x\n", val);
	if (!acpi_asus_wmi_evaluate_method(sc->wmi_dev,
	    ASUS_WMI_METHODID_SPEC, 0, 0x9, 0, &val) && bootverbose)
		device_printf(dev, "WMI BIOS version: %d.%d\n",
		    val >> 16, val & 0xFF);
	if (!acpi_asus_wmi_evaluate_method(sc->wmi_dev,
	    ASUS_WMI_METHODID_SFUN, 0, 0, 0, &val) && bootverbose)
		device_printf(dev, "SFUN value: %#x\n", val);

	ACPI_SERIAL_BEGIN(asus_wmi);

	sc->sysctl_ctx = device_get_sysctl_ctx(dev);
	sc->sysctl_tree = device_get_sysctl_tree(dev);
	SYSCTL_ADD_INT(sc->sysctl_ctx,
	    SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO,
	    "handle_keys", CTLFLAG_RW, &sc->handle_keys,
	    0, "Handle some hardware keys inside the driver");
	for (i = 0; acpi_asus_wmi_sysctls[i].name != NULL; ++i) {
		dev_id = acpi_asus_wmi_sysctls[i].dev_id;
		if (acpi_wpi_asus_get_devstate(sc, dev_id, &val))
			continue;
		switch (dev_id) {
		case ASUS_WMI_DEVID_THERMAL_CTRL:
		case ASUS_WMI_DEVID_PROCESSOR_STATE:
		case ASUS_WMI_DEVID_FAN_CTRL:
		case ASUS_WMI_DEVID_BRIGHTNESS:
			if (val == 0)
				continue;
			break;
		case ASUS_WMI_DEVID_KBD_BACKLIGHT:
			sc->kbd_bkl_level = devstate_to_kbd_bkl_level(val);
			have_kbd_bkl = true;
			/* FALLTHROUGH */
		default:
			if ((val & ASUS_WMI_DSTS_PRESENCE_BIT) == 0)
				continue;
			break;
		}

		if (acpi_asus_wmi_sysctls[i].flag_rdonly != 0) {
			SYSCTL_ADD_PROC(sc->sysctl_ctx,
			    SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO,
			    acpi_asus_wmi_sysctls[i].name,
			    CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
			    sc, i, acpi_asus_wmi_sysctl, "I",
			    acpi_asus_wmi_sysctls[i].description);
		} else {
			SYSCTL_ADD_PROC(sc->sysctl_ctx,
			    SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO,
			    acpi_asus_wmi_sysctls[i].name,
			    CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
			    sc, i, acpi_asus_wmi_sysctl, "I",
			    acpi_asus_wmi_sysctls[i].description);
		}
	}
	ACPI_SERIAL_END(asus_wmi);

	/* Detect and flush event queue */
	if (sc->dsts_id == ASUS_WMI_METHODID_DSTS2) {
		for (i = 0; i <= ASUS_WMI_EVENT_QUEUE_SIZE; i++) {
			if (acpi_asus_wmi_get_event_code(sc->wmi_dev,
			    ASUS_WMI_EVENT_VALUE_ATK, &code) != 0) {
				device_printf(dev,
				    "Can not flush event queue\n");
				break;
			}
			if (code == ASUS_WMI_EVENT_QUEUE_END ||
			    code == ASUS_WMI_EVENT_MASK) {
				sc->event_queue = true;
				break;
			}
		}
	}

#ifdef EVDEV_SUPPORT
	if (sc->notify_guid != NULL) {
		sc->evdev = evdev_alloc();
		evdev_set_name(sc->evdev, device_get_desc(dev));
		evdev_set_phys(sc->evdev, device_get_nameunit(dev));
		evdev_set_id(sc->evdev, BUS_HOST, 0, 0, 1);
		evdev_support_event(sc->evdev, EV_SYN);
		evdev_support_event(sc->evdev, EV_KEY);
		for (i = 0; i < nitems(acpi_asus_wmi_evdev_map); i++) {
			if (acpi_asus_wmi_evdev_map[i].key != NO_KEY)
				evdev_support_key(sc->evdev,
				    acpi_asus_wmi_evdev_map[i].key);
		}

		if (evdev_register(sc->evdev) != 0) {
			device_printf(dev, "Can not register evdev\n");
			acpi_asus_wmi_detach(dev);
			return (ENXIO);
		}
	}
#endif

	if (have_kbd_bkl) {
		sc->kbd_bkl = backlight_register("acpi_asus_wmi", dev);
		if (sc->kbd_bkl == NULL) {
			device_printf(dev, "Can not register backlight\n");
			acpi_asus_wmi_detach(dev);
			return (ENXIO);
		}
	}

	return (0);
}

static int
acpi_asus_wmi_detach(device_t dev)
{
	struct acpi_asus_wmi_softc *sc = device_get_softc(dev);

	ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__);

	if (sc->kbd_bkl != NULL)
		backlight_destroy(sc->kbd_bkl);

	if (sc->notify_guid) {
		ACPI_WMI_REMOVE_EVENT_HANDLER(dev, sc->notify_guid);
#ifdef EVDEV_SUPPORT
		evdev_free(sc->evdev);
#endif
	}

	return (0);
}

static int
acpi_asus_wmi_suspend(device_t dev)
{
	struct acpi_asus_wmi_softc *sc = device_get_softc(dev);

	if (sc->kbd_bkl != NULL) {
		ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__);
		acpi_wpi_asus_set_devstate(sc,
		    ASUS_WMI_DEVID_KBD_BACKLIGHT, 0, NULL);
	}

	return (0);
}

static int
acpi_asus_wmi_resume(device_t dev)
{
	struct acpi_asus_wmi_softc *sc = device_get_softc(dev);

	if (sc->kbd_bkl != NULL) {
		ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__);
		acpi_wpi_asus_set_devstate(sc, ASUS_WMI_DEVID_KBD_BACKLIGHT,
		    kbd_bkl_level_to_devstate(sc->kbd_bkl_level), NULL);
	}

	return (0);
}

static int
acpi_asus_wmi_sysctl(SYSCTL_HANDLER_ARGS)
{
	struct acpi_asus_wmi_softc	*sc;
	int			arg;
	int			oldarg;
	int			error = 0;
	int			function;
	int			dev_id;

	ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);

	sc = (struct acpi_asus_wmi_softc *)oidp->oid_arg1;
	function = oidp->oid_arg2;
	dev_id = acpi_asus_wmi_sysctls[function].dev_id;

	ACPI_SERIAL_BEGIN(asus_wmi);
	arg = acpi_asus_wmi_sysctl_get(sc, dev_id);
	oldarg = arg;
	error = sysctl_handle_int(oidp, &arg, 0, req);
	if (!error && req->newptr != NULL)
		error = acpi_asus_wmi_sysctl_set(sc, dev_id, arg, oldarg);
	ACPI_SERIAL_END(asus_wmi);

	return (error);
}

static int
acpi_asus_wmi_sysctl_get(struct acpi_asus_wmi_softc *sc, int dev_id)
{
	UINT32	val = 0;

	ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
	ACPI_SERIAL_ASSERT(asus_wmi);

	switch(dev_id) {
	case ASUS_WMI_DEVID_THROTTLE_THERMAL_POLICY:
		return (sc->ttp_mode);
	default:
		break;
	}

	acpi_wpi_asus_get_devstate(sc, dev_id, &val);

	switch(dev_id) {
	case ASUS_WMI_DEVID_THERMAL_CTRL:
		val = (val - 2731 + 5) / 10;
		break;
	case ASUS_WMI_DEVID_PROCESSOR_STATE:
	case ASUS_WMI_DEVID_FAN_CTRL:
		break;
	case ASUS_WMI_DEVID_BRIGHTNESS:
		val &= ASUS_WMI_DSTS_BRIGHTNESS_MASK;
		break;
	case ASUS_WMI_DEVID_KBD_BACKLIGHT:
		val &= 0x3;
		break;
	default:
		if (val & ASUS_WMI_DSTS_UNKNOWN_BIT)
			val = -1;
		else
			val = !!(val & ASUS_WMI_DSTS_STATUS_BIT);
		break;
	}

	return (val);
}

static int
acpi_asus_wmi_sysctl_set(struct acpi_asus_wmi_softc *sc, int dev_id, int arg, int oldarg)
{
	ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
	ACPI_SERIAL_ASSERT(asus_wmi);

	switch(dev_id) {
	case ASUS_WMI_DEVID_KBD_BACKLIGHT:
		arg = min(0x3, arg);
		if (arg != 0)
			arg |= 0x80;
		break;
	case ASUS_WMI_DEVID_THROTTLE_THERMAL_POLICY:
		arg = min(0x2, arg);
		sc->ttp_mode = arg;
		break;
	}

	acpi_wpi_asus_set_devstate(sc, dev_id, arg, NULL);

	return (0);
}

static __inline void
acpi_asus_wmi_free_buffer(ACPI_BUFFER* buf) {
	if (buf && buf->Pointer) {
		AcpiOsFree(buf->Pointer);
	}
}

static int
acpi_asus_wmi_get_event_code(device_t wmi_dev, UINT32 notify, int *code)
{
	ACPI_BUFFER response = { ACPI_ALLOCATE_BUFFER, NULL };
	ACPI_OBJECT *obj;
	int error = 0;

	if (ACPI_FAILURE(ACPI_WMI_GET_EVENT_DATA(wmi_dev, notify, &response)))
		return (EIO);
	obj = (ACPI_OBJECT*) response.Pointer;
	if (obj && obj->Type == ACPI_TYPE_INTEGER)
		*code = obj->Integer.Value & ASUS_WMI_EVENT_MASK;
	else
		error = EINVAL;
	acpi_asus_wmi_free_buffer(&response);
	return (error);
}

#ifdef EVDEV_SUPPORT
static void
acpi_asus_wmi_push_evdev_event(struct evdev_dev *evdev, UINT32 notify)
{
	int i;
	uint16_t key;

	for (i = 0; i < nitems(acpi_asus_wmi_evdev_map); i++) {
		if (acpi_asus_wmi_evdev_map[i].notify == notify &&
		    acpi_asus_wmi_evdev_map[i].key != NO_KEY) {
			key = acpi_asus_wmi_evdev_map[i].key;
			evdev_push_key(evdev, key, 1);
			evdev_sync(evdev);
			evdev_push_key(evdev, key, 0);
			evdev_sync(evdev);
			break;
		}
	}
}
#endif

static void
acpi_asus_wmi_handle_event(struct acpi_asus_wmi_softc *sc, int code)
{
	UINT32 val;

	if (code != 0) {
		acpi_UserNotify("ASUS", ACPI_ROOT_OBJECT,
		    code);
#ifdef EVDEV_SUPPORT
		acpi_asus_wmi_push_evdev_event(sc->evdev, code);
#endif
	}
	if (code && sc->handle_keys) {
		/* Keyboard backlight control. */
		if (code == 0xc4 || code == 0xc5) {
			acpi_wpi_asus_get_devstate(sc,
			    ASUS_WMI_DEVID_KBD_BACKLIGHT, &val);
			val &= 0x3;
			if (code == 0xc4) {
				if (val < 0x3)
					val++;
			} else if (val > 0)
				val--;
			if (val != 0)
				val |= 0x80;
			acpi_wpi_asus_set_devstate(sc,
			    ASUS_WMI_DEVID_KBD_BACKLIGHT, val, NULL);
			sc->kbd_bkl_level = devstate_to_kbd_bkl_level(val);
		}
		/* Touchpad control. */
		if (code == 0x6b) {
			acpi_wpi_asus_get_devstate(sc,
			    ASUS_WMI_DEVID_TOUCHPAD, &val);
			val = !(val & 1);
			acpi_wpi_asus_set_devstate(sc,
			    ASUS_WMI_DEVID_TOUCHPAD, val, NULL);
		}
		/* Throttle thermal policy control. */
		if (code == 0xae) {
			sc->ttp_mode++;
			if (sc->ttp_mode > 2)
				sc->ttp_mode = 0;
			acpi_wpi_asus_set_devstate(sc,
			    ASUS_WMI_DEVID_THROTTLE_THERMAL_POLICY,
			    sc->ttp_mode, NULL);
		}
		/* TUF laptop RGB mode control. */
		if (code == 0xb3) {
			const uint32_t cmd = 0xb4;	/* Save to BIOS */
			const uint32_t r = 0xff, g = 0xff, b = 0xff;
			const uint32_t speed = 0xeb;	/* Medium */
			if (sc->tuf_rgb_mode < 2)
				sc->tuf_rgb_mode++;
			else if (sc->tuf_rgb_mode == 2)
				sc->tuf_rgb_mode = 10;
			else sc->tuf_rgb_mode = 0;
			acpi_asus_wmi_evaluate_method(sc->wmi_dev,
			    ASUS_WMI_METHODID_DEVS,
			    ASUS_WMI_DEVID_TUF_RGB_MODE,
			    cmd | (sc->tuf_rgb_mode << 8) | (r << 16) | (g << 24),
			    b | (speed << 8), NULL);
		}
	}
}

static void
acpi_asus_wmi_notify(ACPI_HANDLE h, UINT32 notify, void *context)
{
	device_t dev = context;
	struct acpi_asus_wmi_softc *sc = device_get_softc(dev);
	int code = 0, i = 1;

	ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, notify);

	if (sc->event_queue)
		i += ASUS_WMI_EVENT_QUEUE_SIZE;
	do {
		if (acpi_asus_wmi_get_event_code(sc->wmi_dev, notify, &code)
		    != 0) {
			device_printf(dev, "Failed to get event code\n");
			return;
	        }
		if (code == ASUS_WMI_EVENT_QUEUE_END ||
		    code == ASUS_WMI_EVENT_MASK)
			return;
		acpi_asus_wmi_handle_event(sc, code);
		if (notify != ASUS_WMI_EVENT_VALUE_ATK)
			return;
	} while (--i != 0);
	if (sc->event_queue)
		device_printf(dev, "Can not read event queue, "
		    "last code: 0x%x\n", code);
}

static int
acpi_asus_wmi_evaluate_method(device_t wmi_dev, int method,
    UINT32 arg0, UINT32 arg1, UINT32 arg2, UINT32 *retval)
{
	UINT32		params[3] = { arg0, arg1, arg2 };
	UINT32		result;
	ACPI_OBJECT	*obj;
	ACPI_BUFFER	in = { sizeof(params), &params };
	ACPI_BUFFER	out = { ACPI_ALLOCATE_BUFFER, NULL };

	if (ACPI_FAILURE(ACPI_WMI_EVALUATE_CALL(wmi_dev,
	    ACPI_ASUS_WMI_MGMT_GUID, 1, method, &in, &out))) {
		acpi_asus_wmi_free_buffer(&out);
		return (-EINVAL);
	}
	obj = out.Pointer;
	if (obj && obj->Type == ACPI_TYPE_INTEGER)
		result = (UINT32) obj->Integer.Value;
	else
		result = 0;
	acpi_asus_wmi_free_buffer(&out);
	if (retval)
		*retval = result;
	return (result == ASUS_WMI_UNSUPPORTED_METHOD ? -ENODEV : 0);
}

static int
acpi_wpi_asus_get_devstate(struct acpi_asus_wmi_softc *sc,
    UINT32 dev_id, UINT32 *retval)
{

	return (acpi_asus_wmi_evaluate_method(sc->wmi_dev,
	    sc->dsts_id, dev_id, 0, 0, retval));
}

static int
acpi_wpi_asus_set_devstate(struct acpi_asus_wmi_softc *sc,
    UINT32 dev_id, UINT32 ctrl_param, UINT32 *retval)
{

	return (acpi_asus_wmi_evaluate_method(sc->wmi_dev,
	    ASUS_WMI_METHODID_DEVS, dev_id, ctrl_param, 0, retval));
}

static int
acpi_asus_wmi_backlight_update_status(device_t dev, struct backlight_props
    *props)
{
	struct acpi_asus_wmi_softc *sc = device_get_softc(dev);

	acpi_wpi_asus_set_devstate(sc, ASUS_WMI_DEVID_KBD_BACKLIGHT,
	    kbd_bkl_level_to_devstate(props->brightness), NULL);
	sc->kbd_bkl_level = props->brightness;

	return (0);
}

static int
acpi_asus_wmi_backlight_get_status(device_t dev, struct backlight_props *props)
{
	struct acpi_asus_wmi_softc *sc = device_get_softc(dev);

	props->brightness = sc->kbd_bkl_level;
	props->nlevels = nitems(acpi_asus_wmi_backlight_levels);
	memcpy(props->levels, acpi_asus_wmi_backlight_levels,
	    sizeof(acpi_asus_wmi_backlight_levels));

        return (0);
}

static int
acpi_asus_wmi_backlight_get_info(device_t dev, struct backlight_info *info)
{
        info->type = BACKLIGHT_TYPE_KEYBOARD;
        strlcpy(info->name, "ASUS Keyboard", BACKLIGHTMAXNAMELENGTH);

        return (0);
}