/* * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* Convenience constants. */ #define BTN_FIRST 0x100 // first button scancode #define BTN_LAST 0x15f // last button scancode namespace android { /* * A raw event as retrieved from the EventHub. */ struct RawEvent { nsecs_t when; int32_t deviceId; int32_t type; int32_t scanCode; int32_t keyCode; int32_t value; uint32_t flags; }; /* 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 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 String8 getDeviceName(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, int scancode, int32_t* outKeycode, uint32_t* outFlags) const = 0; virtual status_t mapAxis(int32_t deviceId, int 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& 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; 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& outVirtualKeys) const = 0; virtual String8 getKeyCharacterMapFile(int32_t deviceId) const = 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 String8 getDeviceName(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, int scancode, int32_t* outKeycode, uint32_t* outFlags) const; virtual status_t mapAxis(int32_t deviceId, int scancode, AxisInfo* outAxisInfo) const; virtual void setExcludedDevices(const Vector& 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& outVirtualKeys) const; virtual String8 getKeyCharacterMapFile(int32_t deviceId) const; virtual void requestReopenDevices(); virtual void wake(); virtual void dump(String8& dump); virtual void monitor(); protected: virtual ~EventHub(); private: struct Device { Device* next; int fd; 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 propBitmask[(INPUT_PROP_MAX + 1) / 8]; String8 configurationFile; PropertyMap* configuration; VirtualKeyMap* virtualKeyMap; KeyMap keyMap; Device(int fd, int32_t id, const String8& path, const InputDeviceIdentifier& identifier); ~Device(); void close(); }; status_t openDeviceLocked(const char *devicePath); status_t closeDeviceByPathLocked(const char *devicePath); void closeDeviceLocked(Device* device); void closeAllDevicesLocked(); status_t scanDirLocked(const char *dirname); void scanDevicesLocked(); status_t readNotifyLocked(); 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); // Protect all internal state. mutable Mutex mLock; // The actual id of the built-in keyboard, or -1 if none. // EventHub remaps the built-in keyboard to id 0 externally as required by the API. int32_t mBuiltInKeyboardId; int32_t mNextDeviceId; KeyedVector mDevices; Device *mOpeningDevices; Device *mClosingDevices; bool mNeedToSendFinishedDeviceScan; bool mNeedToReopenDevices; bool mNeedToScanDevices; Vector 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; }; }; // namespace android #endif // _RUNTIME_EVENT_HUB_H