diff --git a/services/inputflinger/EventHub.h b/services/inputflinger/EventHub.h
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+/*
+ * Copyright (C) 2005 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+//
+#ifndef _RUNTIME_EVENT_HUB_H
+#define _RUNTIME_EVENT_HUB_H
+
+#include <input/Input.h>
+#include <input/InputDevice.h>
+#include <input/Keyboard.h>
+#include <input/KeyLayoutMap.h>
+#include <input/KeyCharacterMap.h>
+#include <input/VirtualKeyMap.h>
+#include <utils/String8.h>
+#include <utils/threads.h>
+#include <utils/Log.h>
+#include <utils/threads.h>
+#include <utils/List.h>
+#include <utils/Errors.h>
+#include <utils/PropertyMap.h>
+#include <utils/Vector.h>
+#include <utils/KeyedVector.h>
+#include <utils/BitSet.h>
+
+#include <linux/input.h>
+#include <sys/epoll.h>
+
+/* Convenience constants. */
+
+#define BTN_FIRST 0x100  // first button code
+#define BTN_LAST 0x15f   // last button code
+
+/*
+ * These constants are used privately in Android to pass raw timestamps
+ * through evdev from uinput device drivers because there is currently no
+ * other way to transfer this information.  The evdev driver automatically
+ * timestamps all input events with the time they were posted and clobbers
+ * whatever information was passed in.
+ *
+ * For the purposes of this hack, the timestamp is specified in the
+ * CLOCK_MONOTONIC timebase and is split into two EV_MSC events specifying
+ * seconds and microseconds.
+ */
+#define MSC_ANDROID_TIME_SEC 0x6
+#define MSC_ANDROID_TIME_USEC 0x7
+
+namespace android {
+
+enum {
+    // Device id of a special "virtual" keyboard that is always present.
+    VIRTUAL_KEYBOARD_ID = -1,
+    // Device id of the "built-in" keyboard if there is one.
+    BUILT_IN_KEYBOARD_ID = 0,
+};
+
+/*
+ * A raw event as retrieved from the EventHub.
+ */
+struct RawEvent {
+    nsecs_t when;
+    int32_t deviceId;
+    int32_t type;
+    int32_t code;
+    int32_t value;
+};
+
+/* Describes an absolute axis. */
+struct RawAbsoluteAxisInfo {
+    bool valid; // true if the information is valid, false otherwise
+
+    int32_t minValue;  // minimum value
+    int32_t maxValue;  // maximum value
+    int32_t flat;      // center flat position, eg. flat == 8 means center is between -8 and 8
+    int32_t fuzz;      // error tolerance, eg. fuzz == 4 means value is +/- 4 due to noise
+    int32_t resolution; // resolution in units per mm or radians per mm
+
+    inline void clear() {
+        valid = false;
+        minValue = 0;
+        maxValue = 0;
+        flat = 0;
+        fuzz = 0;
+        resolution = 0;
+    }
+};
+
+/*
+ * Input device classes.
+ */
+enum {
+    /* The input device is a keyboard or has buttons. */
+    INPUT_DEVICE_CLASS_KEYBOARD      = 0x00000001,
+
+    /* The input device is an alpha-numeric keyboard (not just a dial pad). */
+    INPUT_DEVICE_CLASS_ALPHAKEY      = 0x00000002,
+
+    /* The input device is a touchscreen or a touchpad (either single-touch or multi-touch). */
+    INPUT_DEVICE_CLASS_TOUCH         = 0x00000004,
+
+    /* The input device is a cursor device such as a trackball or mouse. */
+    INPUT_DEVICE_CLASS_CURSOR        = 0x00000008,
+
+    /* The input device is a multi-touch touchscreen. */
+    INPUT_DEVICE_CLASS_TOUCH_MT      = 0x00000010,
+
+    /* The input device is a directional pad (implies keyboard, has DPAD keys). */
+    INPUT_DEVICE_CLASS_DPAD          = 0x00000020,
+
+    /* The input device is a gamepad (implies keyboard, has BUTTON keys). */
+    INPUT_DEVICE_CLASS_GAMEPAD       = 0x00000040,
+
+    /* The input device has switches. */
+    INPUT_DEVICE_CLASS_SWITCH        = 0x00000080,
+
+    /* The input device is a joystick (implies gamepad, has joystick absolute axes). */
+    INPUT_DEVICE_CLASS_JOYSTICK      = 0x00000100,
+
+    /* The input device has a vibrator (supports FF_RUMBLE). */
+    INPUT_DEVICE_CLASS_VIBRATOR      = 0x00000200,
+
+    /* The input device is virtual (not a real device, not part of UI configuration). */
+    INPUT_DEVICE_CLASS_VIRTUAL       = 0x40000000,
+
+    /* The input device is external (not built-in). */
+    INPUT_DEVICE_CLASS_EXTERNAL      = 0x80000000,
+};
+
+/*
+ * Gets the class that owns an axis, in cases where multiple classes might claim
+ * the same axis for different purposes.
+ */
+extern uint32_t getAbsAxisUsage(int32_t axis, uint32_t deviceClasses);
+
+/*
+ * Grand Central Station for events.
+ *
+ * The event hub aggregates input events received across all known input
+ * devices on the system, including devices that may be emulated by the simulator
+ * environment.  In addition, the event hub generates fake input events to indicate
+ * when devices are added or removed.
+ *
+ * The event hub provides a stream of input events (via the getEvent function).
+ * It also supports querying the current actual state of input devices such as identifying
+ * which keys are currently down.  Finally, the event hub keeps track of the capabilities of
+ * individual input devices, such as their class and the set of key codes that they support.
+ */
+class EventHubInterface : public virtual RefBase {
+protected:
+    EventHubInterface() { }
+    virtual ~EventHubInterface() { }
+
+public:
+    // Synthetic raw event type codes produced when devices are added or removed.
+    enum {
+        // Sent when a device is added.
+        DEVICE_ADDED = 0x10000000,
+        // Sent when a device is removed.
+        DEVICE_REMOVED = 0x20000000,
+        // Sent when all added/removed devices from the most recent scan have been reported.
+        // This event is always sent at least once.
+        FINISHED_DEVICE_SCAN = 0x30000000,
+
+        FIRST_SYNTHETIC_EVENT = DEVICE_ADDED,
+    };
+
+    virtual uint32_t getDeviceClasses(int32_t deviceId) const = 0;
+
+    virtual InputDeviceIdentifier getDeviceIdentifier(int32_t deviceId) const = 0;
+
+    virtual int32_t getDeviceControllerNumber(int32_t deviceId) const = 0;
+
+    virtual void getConfiguration(int32_t deviceId, PropertyMap* outConfiguration) const = 0;
+
+    virtual status_t getAbsoluteAxisInfo(int32_t deviceId, int axis,
+            RawAbsoluteAxisInfo* outAxisInfo) const = 0;
+
+    virtual bool hasRelativeAxis(int32_t deviceId, int axis) const = 0;
+
+    virtual bool hasInputProperty(int32_t deviceId, int property) const = 0;
+
+    virtual status_t mapKey(int32_t deviceId, int32_t scanCode, int32_t usageCode,
+            int32_t* outKeycode, uint32_t* outFlags) const = 0;
+
+    virtual status_t mapAxis(int32_t deviceId, int32_t scanCode,
+            AxisInfo* outAxisInfo) const = 0;
+
+    // Sets devices that are excluded from opening.
+    // This can be used to ignore input devices for sensors.
+    virtual void setExcludedDevices(const Vector<String8>& devices) = 0;
+
+    /*
+     * Wait for events to become available and returns them.
+     * After returning, the EventHub holds onto a wake lock until the next call to getEvent.
+     * This ensures that the device will not go to sleep while the event is being processed.
+     * If the device needs to remain awake longer than that, then the caller is responsible
+     * for taking care of it (say, by poking the power manager user activity timer).
+     *
+     * The timeout is advisory only.  If the device is asleep, it will not wake just to
+     * service the timeout.
+     *
+     * Returns the number of events obtained, or 0 if the timeout expired.
+     */
+    virtual size_t getEvents(int timeoutMillis, RawEvent* buffer, size_t bufferSize) = 0;
+
+    /*
+     * Query current input state.
+     */
+    virtual int32_t getScanCodeState(int32_t deviceId, int32_t scanCode) const = 0;
+    virtual int32_t getKeyCodeState(int32_t deviceId, int32_t keyCode) const = 0;
+    virtual int32_t getSwitchState(int32_t deviceId, int32_t sw) const = 0;
+    virtual status_t getAbsoluteAxisValue(int32_t deviceId, int32_t axis,
+            int32_t* outValue) const = 0;
+
+    /*
+     * Examine key input devices for specific framework keycode support
+     */
+    virtual bool markSupportedKeyCodes(int32_t deviceId, size_t numCodes, const int32_t* keyCodes,
+            uint8_t* outFlags) const = 0;
+
+    virtual bool hasScanCode(int32_t deviceId, int32_t scanCode) const = 0;
+
+    /* LED related functions expect Android LED constants, not scan codes or HID usages */
+    virtual bool hasLed(int32_t deviceId, int32_t led) const = 0;
+    virtual void setLedState(int32_t deviceId, int32_t led, bool on) = 0;
+
+    virtual void getVirtualKeyDefinitions(int32_t deviceId,
+            Vector<VirtualKeyDefinition>& outVirtualKeys) const = 0;
+
+    virtual sp<KeyCharacterMap> getKeyCharacterMap(int32_t deviceId) const = 0;
+    virtual bool setKeyboardLayoutOverlay(int32_t deviceId, const sp<KeyCharacterMap>& map) = 0;
+
+    /* Control the vibrator. */
+    virtual void vibrate(int32_t deviceId, nsecs_t duration) = 0;
+    virtual void cancelVibrate(int32_t deviceId) = 0;
+
+    /* Requests the EventHub to reopen all input devices on the next call to getEvents(). */
+    virtual void requestReopenDevices() = 0;
+
+    /* Wakes up getEvents() if it is blocked on a read. */
+    virtual void wake() = 0;
+
+    /* Dump EventHub state to a string. */
+    virtual void dump(String8& dump) = 0;
+
+    /* Called by the heatbeat to ensures that the reader has not deadlocked. */
+    virtual void monitor() = 0;
+};
+
+class EventHub : public EventHubInterface
+{
+public:
+    EventHub();
+
+    virtual uint32_t getDeviceClasses(int32_t deviceId) const;
+
+    virtual InputDeviceIdentifier getDeviceIdentifier(int32_t deviceId) const;
+
+    virtual int32_t getDeviceControllerNumber(int32_t deviceId) const;
+
+    virtual void getConfiguration(int32_t deviceId, PropertyMap* outConfiguration) const;
+
+    virtual status_t getAbsoluteAxisInfo(int32_t deviceId, int axis,
+            RawAbsoluteAxisInfo* outAxisInfo) const;
+
+    virtual bool hasRelativeAxis(int32_t deviceId, int axis) const;
+
+    virtual bool hasInputProperty(int32_t deviceId, int property) const;
+
+    virtual status_t mapKey(int32_t deviceId, int32_t scanCode, int32_t usageCode,
+            int32_t* outKeycode, uint32_t* outFlags) const;
+
+    virtual status_t mapAxis(int32_t deviceId, int32_t scanCode,
+            AxisInfo* outAxisInfo) const;
+
+    virtual void setExcludedDevices(const Vector<String8>& devices);
+
+    virtual int32_t getScanCodeState(int32_t deviceId, int32_t scanCode) const;
+    virtual int32_t getKeyCodeState(int32_t deviceId, int32_t keyCode) const;
+    virtual int32_t getSwitchState(int32_t deviceId, int32_t sw) const;
+    virtual status_t getAbsoluteAxisValue(int32_t deviceId, int32_t axis, int32_t* outValue) const;
+
+    virtual bool markSupportedKeyCodes(int32_t deviceId, size_t numCodes,
+            const int32_t* keyCodes, uint8_t* outFlags) const;
+
+    virtual size_t getEvents(int timeoutMillis, RawEvent* buffer, size_t bufferSize);
+
+    virtual bool hasScanCode(int32_t deviceId, int32_t scanCode) const;
+    virtual bool hasLed(int32_t deviceId, int32_t led) const;
+    virtual void setLedState(int32_t deviceId, int32_t led, bool on);
+
+    virtual void getVirtualKeyDefinitions(int32_t deviceId,
+            Vector<VirtualKeyDefinition>& outVirtualKeys) const;
+
+    virtual sp<KeyCharacterMap> getKeyCharacterMap(int32_t deviceId) const;
+    virtual bool setKeyboardLayoutOverlay(int32_t deviceId, const sp<KeyCharacterMap>& map);
+
+    virtual void vibrate(int32_t deviceId, nsecs_t duration);
+    virtual void cancelVibrate(int32_t deviceId);
+
+    virtual void requestReopenDevices();
+
+    virtual void wake();
+
+    virtual void dump(String8& dump);
+    virtual void monitor();
+
+protected:
+    virtual ~EventHub();
+
+private:
+    struct Device {
+        Device* next;
+
+        int fd; // may be -1 if device is virtual
+        const int32_t id;
+        const String8 path;
+        const InputDeviceIdentifier identifier;
+
+        uint32_t classes;
+
+        uint8_t keyBitmask[(KEY_MAX + 1) / 8];
+        uint8_t absBitmask[(ABS_MAX + 1) / 8];
+        uint8_t relBitmask[(REL_MAX + 1) / 8];
+        uint8_t swBitmask[(SW_MAX + 1) / 8];
+        uint8_t ledBitmask[(LED_MAX + 1) / 8];
+        uint8_t ffBitmask[(FF_MAX + 1) / 8];
+        uint8_t propBitmask[(INPUT_PROP_MAX + 1) / 8];
+
+        String8 configurationFile;
+        PropertyMap* configuration;
+        VirtualKeyMap* virtualKeyMap;
+        KeyMap keyMap;
+
+        sp<KeyCharacterMap> overlayKeyMap;
+        sp<KeyCharacterMap> combinedKeyMap;
+
+        bool ffEffectPlaying;
+        int16_t ffEffectId; // initially -1
+
+        int32_t controllerNumber;
+
+        int32_t timestampOverrideSec;
+        int32_t timestampOverrideUsec;
+
+        Device(int fd, int32_t id, const String8& path, const InputDeviceIdentifier& identifier);
+        ~Device();
+
+        void close();
+
+        inline bool isVirtual() const { return fd < 0; }
+
+        const sp<KeyCharacterMap>& getKeyCharacterMap() const {
+            if (combinedKeyMap != NULL) {
+                return combinedKeyMap;
+            }
+            return keyMap.keyCharacterMap;
+        }
+    };
+
+    status_t openDeviceLocked(const char *devicePath);
+    void createVirtualKeyboardLocked();
+    void addDeviceLocked(Device* device);
+    void assignDescriptorLocked(InputDeviceIdentifier& identifier);
+
+    status_t closeDeviceByPathLocked(const char *devicePath);
+    void closeDeviceLocked(Device* device);
+    void closeAllDevicesLocked();
+
+    status_t scanDirLocked(const char *dirname);
+    void scanDevicesLocked();
+    status_t readNotifyLocked();
+
+    Device* getDeviceByDescriptorLocked(String8& descriptor) const;
+    Device* getDeviceLocked(int32_t deviceId) const;
+    Device* getDeviceByPathLocked(const char* devicePath) const;
+
+    bool hasKeycodeLocked(Device* device, int keycode) const;
+
+    void loadConfigurationLocked(Device* device);
+    status_t loadVirtualKeyMapLocked(Device* device);
+    status_t loadKeyMapLocked(Device* device);
+
+    bool isExternalDeviceLocked(Device* device);
+
+    int32_t getNextControllerNumberLocked(Device* device);
+    void releaseControllerNumberLocked(Device* device);
+    void setLedForController(Device* device);
+
+    status_t mapLed(Device* device, int32_t led, int32_t* outScanCode) const;
+    void setLedStateLocked(Device* device, int32_t led, bool on);
+
+    // Protect all internal state.
+    mutable Mutex mLock;
+
+    // The actual id of the built-in keyboard, or NO_BUILT_IN_KEYBOARD if none.
+    // EventHub remaps the built-in keyboard to id 0 externally as required by the API.
+    enum {
+        // Must not conflict with any other assigned device ids, including
+        // the virtual keyboard id (-1).
+        NO_BUILT_IN_KEYBOARD = -2,
+    };
+    int32_t mBuiltInKeyboardId;
+
+    int32_t mNextDeviceId;
+
+    BitSet32 mControllerNumbers;
+
+    KeyedVector<int32_t, Device*> mDevices;
+
+    Device *mOpeningDevices;
+    Device *mClosingDevices;
+
+    bool mNeedToSendFinishedDeviceScan;
+    bool mNeedToReopenDevices;
+    bool mNeedToScanDevices;
+    Vector<String8> mExcludedDevices;
+
+    int mEpollFd;
+    int mINotifyFd;
+    int mWakeReadPipeFd;
+    int mWakeWritePipeFd;
+
+    // Ids used for epoll notifications not associated with devices.
+    static const uint32_t EPOLL_ID_INOTIFY = 0x80000001;
+    static const uint32_t EPOLL_ID_WAKE = 0x80000002;
+
+    // Epoll FD list size hint.
+    static const int EPOLL_SIZE_HINT = 8;
+
+    // Maximum number of signalled FDs to handle at a time.
+    static const int EPOLL_MAX_EVENTS = 16;
+
+    // The array of pending epoll events and the index of the next event to be handled.
+    struct epoll_event mPendingEventItems[EPOLL_MAX_EVENTS];
+    size_t mPendingEventCount;
+    size_t mPendingEventIndex;
+    bool mPendingINotify;
+
+    bool mUsingEpollWakeup;
+};
+
+}; // namespace android
+
+#endif // _RUNTIME_EVENT_HUB_H