2 * Copyright (C) 2005 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
18 #ifndef _RUNTIME_EVENT_HUB_H
19 #define _RUNTIME_EVENT_HUB_H
21 #include <androidfw/Input.h>
22 #include <androidfw/InputDevice.h>
23 #include <androidfw/Keyboard.h>
24 #include <androidfw/KeyLayoutMap.h>
25 #include <androidfw/KeyCharacterMap.h>
26 #include <androidfw/VirtualKeyMap.h>
27 #include <utils/String8.h>
28 #include <utils/threads.h>
29 #include <utils/Log.h>
30 #include <utils/threads.h>
31 #include <utils/List.h>
32 #include <utils/Errors.h>
33 #include <utils/PropertyMap.h>
34 #include <utils/Vector.h>
35 #include <utils/KeyedVector.h>
37 #include <linux/input.h>
38 #include <sys/epoll.h>
40 /* Convenience constants. */
42 #define BTN_FIRST 0x100 // first button code
43 #define BTN_LAST 0x15f // last button code
46 * These constants are used privately in Android to pass raw timestamps
47 * through evdev from uinput device drivers because there is currently no
48 * other way to transfer this information. The evdev driver automatically
49 * timestamps all input events with the time they were posted and clobbers
50 * whatever information was passed in.
52 * For the purposes of this hack, the timestamp is specified in the
53 * CLOCK_MONOTONIC timebase and is split into two EV_MSC events specifying
54 * seconds and microseconds.
56 #define MSC_ANDROID_TIME_SEC 0x6
57 #define MSC_ANDROID_TIME_USEC 0x7
62 // Device id of a special "virtual" keyboard that is always present.
63 VIRTUAL_KEYBOARD_ID = -1,
64 // Device id of the "built-in" keyboard if there is one.
65 BUILT_IN_KEYBOARD_ID = 0,
69 * A raw event as retrieved from the EventHub.
79 /* Describes an absolute axis. */
80 struct RawAbsoluteAxisInfo {
81 bool valid; // true if the information is valid, false otherwise
83 int32_t minValue; // minimum value
84 int32_t maxValue; // maximum value
85 int32_t flat; // center flat position, eg. flat == 8 means center is between -8 and 8
86 int32_t fuzz; // error tolerance, eg. fuzz == 4 means value is +/- 4 due to noise
87 int32_t resolution; // resolution in units per mm or radians per mm
100 * Input device classes.
103 /* The input device is a keyboard or has buttons. */
104 INPUT_DEVICE_CLASS_KEYBOARD = 0x00000001,
106 /* The input device is an alpha-numeric keyboard (not just a dial pad). */
107 INPUT_DEVICE_CLASS_ALPHAKEY = 0x00000002,
109 /* The input device is a touchscreen or a touchpad (either single-touch or multi-touch). */
110 INPUT_DEVICE_CLASS_TOUCH = 0x00000004,
112 /* The input device is a cursor device such as a trackball or mouse. */
113 INPUT_DEVICE_CLASS_CURSOR = 0x00000008,
115 /* The input device is a multi-touch touchscreen. */
116 INPUT_DEVICE_CLASS_TOUCH_MT = 0x00000010,
118 /* The input device is a directional pad (implies keyboard, has DPAD keys). */
119 INPUT_DEVICE_CLASS_DPAD = 0x00000020,
121 /* The input device is a gamepad (implies keyboard, has BUTTON keys). */
122 INPUT_DEVICE_CLASS_GAMEPAD = 0x00000040,
124 /* The input device has switches. */
125 INPUT_DEVICE_CLASS_SWITCH = 0x00000080,
127 /* The input device is a joystick (implies gamepad, has joystick absolute axes). */
128 INPUT_DEVICE_CLASS_JOYSTICK = 0x00000100,
130 /* The input device has a vibrator (supports FF_RUMBLE). */
131 INPUT_DEVICE_CLASS_VIBRATOR = 0x00000200,
133 /* The input device is virtual (not a real device, not part of UI configuration). */
134 INPUT_DEVICE_CLASS_VIRTUAL = 0x40000000,
136 /* The input device is external (not built-in). */
137 INPUT_DEVICE_CLASS_EXTERNAL = 0x80000000,
141 * Gets the class that owns an axis, in cases where multiple classes might claim
142 * the same axis for different purposes.
144 extern uint32_t getAbsAxisUsage(int32_t axis, uint32_t deviceClasses);
147 * Grand Central Station for events.
149 * The event hub aggregates input events received across all known input
150 * devices on the system, including devices that may be emulated by the simulator
151 * environment. In addition, the event hub generates fake input events to indicate
152 * when devices are added or removed.
154 * The event hub provides a stream of input events (via the getEvent function).
155 * It also supports querying the current actual state of input devices such as identifying
156 * which keys are currently down. Finally, the event hub keeps track of the capabilities of
157 * individual input devices, such as their class and the set of key codes that they support.
159 class EventHubInterface : public virtual RefBase {
161 EventHubInterface() { }
162 virtual ~EventHubInterface() { }
165 // Synthetic raw event type codes produced when devices are added or removed.
167 // Sent when a device is added.
168 DEVICE_ADDED = 0x10000000,
169 // Sent when a device is removed.
170 DEVICE_REMOVED = 0x20000000,
171 // Sent when all added/removed devices from the most recent scan have been reported.
172 // This event is always sent at least once.
173 FINISHED_DEVICE_SCAN = 0x30000000,
175 FIRST_SYNTHETIC_EVENT = DEVICE_ADDED,
178 virtual uint32_t getDeviceClasses(int32_t deviceId) const = 0;
180 virtual InputDeviceIdentifier getDeviceIdentifier(int32_t deviceId) const = 0;
182 virtual void getConfiguration(int32_t deviceId, PropertyMap* outConfiguration) const = 0;
184 virtual status_t getAbsoluteAxisInfo(int32_t deviceId, int axis,
185 RawAbsoluteAxisInfo* outAxisInfo) const = 0;
187 virtual bool hasRelativeAxis(int32_t deviceId, int axis) const = 0;
189 virtual bool hasInputProperty(int32_t deviceId, int property) const = 0;
191 virtual status_t mapKey(int32_t deviceId, int32_t scanCode, int32_t usageCode,
192 int32_t* outKeycode, uint32_t* outFlags) const = 0;
194 virtual status_t mapAxis(int32_t deviceId, int32_t scanCode,
195 AxisInfo* outAxisInfo) const = 0;
197 // Sets devices that are excluded from opening.
198 // This can be used to ignore input devices for sensors.
199 virtual void setExcludedDevices(const Vector<String8>& devices) = 0;
202 * Wait for events to become available and returns them.
203 * After returning, the EventHub holds onto a wake lock until the next call to getEvent.
204 * This ensures that the device will not go to sleep while the event is being processed.
205 * If the device needs to remain awake longer than that, then the caller is responsible
206 * for taking care of it (say, by poking the power manager user activity timer).
208 * The timeout is advisory only. If the device is asleep, it will not wake just to
209 * service the timeout.
211 * Returns the number of events obtained, or 0 if the timeout expired.
213 virtual size_t getEvents(int timeoutMillis, RawEvent* buffer, size_t bufferSize) = 0;
216 * Query current input state.
218 virtual int32_t getScanCodeState(int32_t deviceId, int32_t scanCode) const = 0;
219 virtual int32_t getKeyCodeState(int32_t deviceId, int32_t keyCode) const = 0;
220 virtual int32_t getSwitchState(int32_t deviceId, int32_t sw) const = 0;
221 virtual status_t getAbsoluteAxisValue(int32_t deviceId, int32_t axis,
222 int32_t* outValue) const = 0;
225 * Examine key input devices for specific framework keycode support
227 virtual bool markSupportedKeyCodes(int32_t deviceId, size_t numCodes, const int32_t* keyCodes,
228 uint8_t* outFlags) const = 0;
230 virtual bool hasScanCode(int32_t deviceId, int32_t scanCode) const = 0;
231 virtual bool hasLed(int32_t deviceId, int32_t led) const = 0;
232 virtual void setLedState(int32_t deviceId, int32_t led, bool on) = 0;
234 virtual void getVirtualKeyDefinitions(int32_t deviceId,
235 Vector<VirtualKeyDefinition>& outVirtualKeys) const = 0;
237 virtual sp<KeyCharacterMap> getKeyCharacterMap(int32_t deviceId) const = 0;
238 virtual bool setKeyboardLayoutOverlay(int32_t deviceId, const sp<KeyCharacterMap>& map) = 0;
240 /* Control the vibrator. */
241 virtual void vibrate(int32_t deviceId, nsecs_t duration) = 0;
242 virtual void cancelVibrate(int32_t deviceId) = 0;
244 /* Requests the EventHub to reopen all input devices on the next call to getEvents(). */
245 virtual void requestReopenDevices() = 0;
247 /* Wakes up getEvents() if it is blocked on a read. */
248 virtual void wake() = 0;
250 /* Dump EventHub state to a string. */
251 virtual void dump(String8& dump) = 0;
253 /* Called by the heatbeat to ensures that the reader has not deadlocked. */
254 virtual void monitor() = 0;
257 class EventHub : public EventHubInterface
262 virtual uint32_t getDeviceClasses(int32_t deviceId) const;
264 virtual InputDeviceIdentifier getDeviceIdentifier(int32_t deviceId) const;
266 virtual void getConfiguration(int32_t deviceId, PropertyMap* outConfiguration) const;
268 virtual status_t getAbsoluteAxisInfo(int32_t deviceId, int axis,
269 RawAbsoluteAxisInfo* outAxisInfo) const;
271 virtual bool hasRelativeAxis(int32_t deviceId, int axis) const;
273 virtual bool hasInputProperty(int32_t deviceId, int property) const;
275 virtual status_t mapKey(int32_t deviceId, int32_t scanCode, int32_t usageCode,
276 int32_t* outKeycode, uint32_t* outFlags) const;
278 virtual status_t mapAxis(int32_t deviceId, int32_t scanCode,
279 AxisInfo* outAxisInfo) const;
281 virtual void setExcludedDevices(const Vector<String8>& devices);
283 virtual int32_t getScanCodeState(int32_t deviceId, int32_t scanCode) const;
284 virtual int32_t getKeyCodeState(int32_t deviceId, int32_t keyCode) const;
285 virtual int32_t getSwitchState(int32_t deviceId, int32_t sw) const;
286 virtual status_t getAbsoluteAxisValue(int32_t deviceId, int32_t axis, int32_t* outValue) const;
288 virtual bool markSupportedKeyCodes(int32_t deviceId, size_t numCodes,
289 const int32_t* keyCodes, uint8_t* outFlags) const;
291 virtual size_t getEvents(int timeoutMillis, RawEvent* buffer, size_t bufferSize);
293 virtual bool hasScanCode(int32_t deviceId, int32_t scanCode) const;
294 virtual bool hasLed(int32_t deviceId, int32_t led) const;
295 virtual void setLedState(int32_t deviceId, int32_t led, bool on);
297 virtual void getVirtualKeyDefinitions(int32_t deviceId,
298 Vector<VirtualKeyDefinition>& outVirtualKeys) const;
300 virtual sp<KeyCharacterMap> getKeyCharacterMap(int32_t deviceId) const;
301 virtual bool setKeyboardLayoutOverlay(int32_t deviceId, const sp<KeyCharacterMap>& map);
303 virtual void vibrate(int32_t deviceId, nsecs_t duration);
304 virtual void cancelVibrate(int32_t deviceId);
306 virtual void requestReopenDevices();
310 virtual void dump(String8& dump);
311 virtual void monitor();
320 int fd; // may be -1 if device is virtual
323 const InputDeviceIdentifier identifier;
327 uint8_t keyBitmask[(KEY_MAX + 1) / 8];
328 uint8_t absBitmask[(ABS_MAX + 1) / 8];
329 uint8_t relBitmask[(REL_MAX + 1) / 8];
330 uint8_t swBitmask[(SW_MAX + 1) / 8];
331 uint8_t ledBitmask[(LED_MAX + 1) / 8];
332 uint8_t ffBitmask[(FF_MAX + 1) / 8];
333 uint8_t propBitmask[(INPUT_PROP_MAX + 1) / 8];
335 String8 configurationFile;
336 PropertyMap* configuration;
337 VirtualKeyMap* virtualKeyMap;
340 sp<KeyCharacterMap> overlayKeyMap;
341 sp<KeyCharacterMap> combinedKeyMap;
343 bool ffEffectPlaying;
344 int16_t ffEffectId; // initially -1
346 int32_t timestampOverrideSec;
347 int32_t timestampOverrideUsec;
349 Device(int fd, int32_t id, const String8& path, const InputDeviceIdentifier& identifier);
354 inline bool isVirtual() const { return fd < 0; }
356 const sp<KeyCharacterMap>& getKeyCharacterMap() const {
357 if (combinedKeyMap != NULL) {
358 return combinedKeyMap;
360 return keyMap.keyCharacterMap;
364 status_t openDeviceLocked(const char *devicePath);
365 void createVirtualKeyboardLocked();
366 void addDeviceLocked(Device* device);
368 status_t closeDeviceByPathLocked(const char *devicePath);
369 void closeDeviceLocked(Device* device);
370 void closeAllDevicesLocked();
372 status_t scanDirLocked(const char *dirname);
373 void scanDevicesLocked();
374 status_t readNotifyLocked();
376 Device* getDeviceLocked(int32_t deviceId) const;
377 Device* getDeviceByPathLocked(const char* devicePath) const;
379 bool hasKeycodeLocked(Device* device, int keycode) const;
381 void loadConfigurationLocked(Device* device);
382 status_t loadVirtualKeyMapLocked(Device* device);
383 status_t loadKeyMapLocked(Device* device);
385 bool isExternalDeviceLocked(Device* device);
387 // Protect all internal state.
390 // The actual id of the built-in keyboard, or NO_BUILT_IN_KEYBOARD if none.
391 // EventHub remaps the built-in keyboard to id 0 externally as required by the API.
393 // Must not conflict with any other assigned device ids, including
394 // the virtual keyboard id (-1).
395 NO_BUILT_IN_KEYBOARD = -2,
397 int32_t mBuiltInKeyboardId;
399 int32_t mNextDeviceId;
401 KeyedVector<int32_t, Device*> mDevices;
403 Device *mOpeningDevices;
404 Device *mClosingDevices;
406 bool mNeedToSendFinishedDeviceScan;
407 bool mNeedToReopenDevices;
408 bool mNeedToScanDevices;
409 Vector<String8> mExcludedDevices;
414 int mWakeWritePipeFd;
416 // Ids used for epoll notifications not associated with devices.
417 static const uint32_t EPOLL_ID_INOTIFY = 0x80000001;
418 static const uint32_t EPOLL_ID_WAKE = 0x80000002;
420 // Epoll FD list size hint.
421 static const int EPOLL_SIZE_HINT = 8;
423 // Maximum number of signalled FDs to handle at a time.
424 static const int EPOLL_MAX_EVENTS = 16;
426 // The array of pending epoll events and the index of the next event to be handled.
427 struct epoll_event mPendingEventItems[EPOLL_MAX_EVENTS];
428 size_t mPendingEventCount;
429 size_t mPendingEventIndex;
430 bool mPendingINotify;
433 }; // namespace android
435 #endif // _RUNTIME_EVENT_HUB_H