EventHub.h revision 2dceb67f1f32bd2ec589c4ac3d83da0b8dbe4a5c 
1/*
2 * Copyright (C) 2005 The Android Open Source Project
3 *
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
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
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.
15 */
16
17//
18#ifndef _RUNTIME_EVENT_HUB_H
19#define _RUNTIME_EVENT_HUB_H
20
21#include <input/Input.h>
22#include <input/InputDevice.h>
23#include <input/Keyboard.h>
24#include <input/KeyLayoutMap.h>
25#include <input/KeyCharacterMap.h>
26#include <input/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>
36#include <utils/BitSet.h>
37
38#include <linux/input.h>
39#include <sys/epoll.h>
40
41/* Convenience constants. */
42
43#define BTN_FIRST 0x100  // first button code
44#define BTN_LAST 0x15f   // last button code
45
46/*
47 * These constants are used privately in Android to pass raw timestamps
48 * through evdev from uinput device drivers because there is currently no
49 * other way to transfer this information.  The evdev driver automatically
50 * timestamps all input events with the time they were posted and clobbers
51 * whatever information was passed in.
52 *
53 * For the purposes of this hack, the timestamp is specified in the
54 * CLOCK_MONOTONIC timebase and is split into two EV_MSC events specifying
55 * seconds and microseconds.
56 */
57#define MSC_ANDROID_TIME_SEC 0x6
58#define MSC_ANDROID_TIME_USEC 0x7
59
60namespace android {
61
62enum {
63    // Device id of a special "virtual" keyboard that is always present.
64    VIRTUAL_KEYBOARD_ID = -1,
65    // Device id of the "built-in" keyboard if there is one.
66    BUILT_IN_KEYBOARD_ID = 0,
67};
68
69/*
70 * A raw event as retrieved from the EventHub.
71 */
72struct RawEvent {
73    nsecs_t when;
74    int32_t deviceId;
75    int32_t type;
76    int32_t code;
77    int32_t value;
78};
79
80/* Describes an absolute axis. */
81struct RawAbsoluteAxisInfo {
82    bool valid; // true if the information is valid, false otherwise
83
84    int32_t minValue;  // minimum value
85    int32_t maxValue;  // maximum value
86    int32_t flat;      // center flat position, eg. flat == 8 means center is between -8 and 8
87    int32_t fuzz;      // error tolerance, eg. fuzz == 4 means value is +/- 4 due to noise
88    int32_t resolution; // resolution in units per mm or radians per mm
89
90    inline void clear() {
91        valid = false;
92        minValue = 0;
93        maxValue = 0;
94        flat = 0;
95        fuzz = 0;
96        resolution = 0;
97    }
98};
99
100/*
101 * Input device classes.
102 */
103enum {
104    /* The input device is a keyboard or has buttons. */
105    INPUT_DEVICE_CLASS_KEYBOARD      = 0x00000001,
106
107    /* The input device is an alpha-numeric keyboard (not just a dial pad). */
108    INPUT_DEVICE_CLASS_ALPHAKEY      = 0x00000002,
109
110    /* The input device is a touchscreen or a touchpad (either single-touch or multi-touch). */
111    INPUT_DEVICE_CLASS_TOUCH         = 0x00000004,
112
113    /* The input device is a cursor device such as a trackball or mouse. */
114    INPUT_DEVICE_CLASS_CURSOR        = 0x00000008,
115
116    /* The input device is a multi-touch touchscreen. */
117    INPUT_DEVICE_CLASS_TOUCH_MT      = 0x00000010,
118
119    /* The input device is a directional pad (implies keyboard, has DPAD keys). */
120    INPUT_DEVICE_CLASS_DPAD          = 0x00000020,
121
122    /* The input device is a gamepad (implies keyboard, has BUTTON keys). */
123    INPUT_DEVICE_CLASS_GAMEPAD       = 0x00000040,
124
125    /* The input device has switches. */
126    INPUT_DEVICE_CLASS_SWITCH        = 0x00000080,
127
128    /* The input device is a joystick (implies gamepad, has joystick absolute axes). */
129    INPUT_DEVICE_CLASS_JOYSTICK      = 0x00000100,
130
131    /* The input device has a vibrator (supports FF_RUMBLE). */
132    INPUT_DEVICE_CLASS_VIBRATOR      = 0x00000200,
133
134    /* The input device is virtual (not a real device, not part of UI configuration). */
135    INPUT_DEVICE_CLASS_VIRTUAL       = 0x40000000,
136
137    /* The input device is external (not built-in). */
138    INPUT_DEVICE_CLASS_EXTERNAL      = 0x80000000,
139};
140
141/*
142 * Gets the class that owns an axis, in cases where multiple classes might claim
143 * the same axis for different purposes.
144 */
145extern uint32_t getAbsAxisUsage(int32_t axis, uint32_t deviceClasses);
146
147/*
148 * Grand Central Station for events.
149 *
150 * The event hub aggregates input events received across all known input
151 * devices on the system, including devices that may be emulated by the simulator
152 * environment.  In addition, the event hub generates fake input events to indicate
153 * when devices are added or removed.
154 *
155 * The event hub provides a stream of input events (via the getEvent function).
156 * It also supports querying the current actual state of input devices such as identifying
157 * which keys are currently down.  Finally, the event hub keeps track of the capabilities of
158 * individual input devices, such as their class and the set of key codes that they support.
159 */
160class EventHubInterface : public virtual RefBase {
161protected:
162    EventHubInterface() { }
163    virtual ~EventHubInterface() { }
164
165public:
166    // Synthetic raw event type codes produced when devices are added or removed.
167    enum {
168        // Sent when a device is added.
169        DEVICE_ADDED = 0x10000000,
170        // Sent when a device is removed.
171        DEVICE_REMOVED = 0x20000000,
172        // Sent when all added/removed devices from the most recent scan have been reported.
173        // This event is always sent at least once.
174        FINISHED_DEVICE_SCAN = 0x30000000,
175
176        FIRST_SYNTHETIC_EVENT = DEVICE_ADDED,
177    };
178
179    virtual uint32_t getDeviceClasses(int32_t deviceId) const = 0;
180
181    virtual InputDeviceIdentifier getDeviceIdentifier(int32_t deviceId) const = 0;
182
183    virtual int32_t getDeviceControllerNumber(int32_t deviceId) const = 0;
184
185    virtual void getConfiguration(int32_t deviceId, PropertyMap* outConfiguration) const = 0;
186
187    virtual status_t getAbsoluteAxisInfo(int32_t deviceId, int axis,
188            RawAbsoluteAxisInfo* outAxisInfo) const = 0;
189
190    virtual bool hasRelativeAxis(int32_t deviceId, int axis) const = 0;
191
192    virtual bool hasInputProperty(int32_t deviceId, int property) const = 0;
193
194    virtual status_t mapKey(int32_t deviceId, int32_t scanCode, int32_t usageCode,
195            int32_t* outKeycode, uint32_t* outFlags) const = 0;
196
197    virtual status_t mapAxis(int32_t deviceId, int32_t scanCode,
198            AxisInfo* outAxisInfo) const = 0;
199
200    // Sets devices that are excluded from opening.
201    // This can be used to ignore input devices for sensors.
202    virtual void setExcludedDevices(const Vector<String8>& devices) = 0;
203
204    /*
205     * Wait for events to become available and returns them.
206     * After returning, the EventHub holds onto a wake lock until the next call to getEvent.
207     * This ensures that the device will not go to sleep while the event is being processed.
208     * If the device needs to remain awake longer than that, then the caller is responsible
209     * for taking care of it (say, by poking the power manager user activity timer).
210     *
211     * The timeout is advisory only.  If the device is asleep, it will not wake just to
212     * service the timeout.
213     *
214     * Returns the number of events obtained, or 0 if the timeout expired.
215     */
216    virtual size_t getEvents(int timeoutMillis, RawEvent* buffer, size_t bufferSize) = 0;
217
218    /*
219     * Query current input state.
220     */
221    virtual int32_t getScanCodeState(int32_t deviceId, int32_t scanCode) const = 0;
222    virtual int32_t getKeyCodeState(int32_t deviceId, int32_t keyCode) const = 0;
223    virtual int32_t getSwitchState(int32_t deviceId, int32_t sw) const = 0;
224    virtual status_t getAbsoluteAxisValue(int32_t deviceId, int32_t axis,
225            int32_t* outValue) const = 0;
226
227    /*
228     * Examine key input devices for specific framework keycode support
229     */
230    virtual bool markSupportedKeyCodes(int32_t deviceId, size_t numCodes, const int32_t* keyCodes,
231            uint8_t* outFlags) const = 0;
232
233    virtual bool hasScanCode(int32_t deviceId, int32_t scanCode) const = 0;
234
235    /* LED related functions expect Android LED constants, not scan codes or HID usages */
236    virtual bool hasLed(int32_t deviceId, int32_t led) const = 0;
237    virtual void setLedState(int32_t deviceId, int32_t led, bool on) = 0;
238
239    virtual void getVirtualKeyDefinitions(int32_t deviceId,
240            Vector<VirtualKeyDefinition>& outVirtualKeys) const = 0;
241
242    virtual sp<KeyCharacterMap> getKeyCharacterMap(int32_t deviceId) const = 0;
243    virtual bool setKeyboardLayoutOverlay(int32_t deviceId, const sp<KeyCharacterMap>& map) = 0;
244
245    /* Control the vibrator. */
246    virtual void vibrate(int32_t deviceId, nsecs_t duration) = 0;
247    virtual void cancelVibrate(int32_t deviceId) = 0;
248
249    /* Requests the EventHub to reopen all input devices on the next call to getEvents(). */
250    virtual void requestReopenDevices() = 0;
251
252    /* Wakes up getEvents() if it is blocked on a read. */
253    virtual void wake() = 0;
254
255    /* Dump EventHub state to a string. */
256    virtual void dump(String8& dump) = 0;
257
258    /* Called by the heatbeat to ensures that the reader has not deadlocked. */
259    virtual void monitor() = 0;
260};
261
262class EventHub : public EventHubInterface
263{
264public:
265    EventHub();
266
267    virtual uint32_t getDeviceClasses(int32_t deviceId) const;
268
269    virtual InputDeviceIdentifier getDeviceIdentifier(int32_t deviceId) const;
270
271    virtual int32_t getDeviceControllerNumber(int32_t deviceId) const;
272
273    virtual void getConfiguration(int32_t deviceId, PropertyMap* outConfiguration) const;
274
275    virtual status_t getAbsoluteAxisInfo(int32_t deviceId, int axis,
276            RawAbsoluteAxisInfo* outAxisInfo) const;
277
278    virtual bool hasRelativeAxis(int32_t deviceId, int axis) const;
279
280    virtual bool hasInputProperty(int32_t deviceId, int property) const;
281
282    virtual status_t mapKey(int32_t deviceId, int32_t scanCode, int32_t usageCode,
283            int32_t* outKeycode, uint32_t* outFlags) const;
284
285    virtual status_t mapAxis(int32_t deviceId, int32_t scanCode,
286            AxisInfo* outAxisInfo) const;
287
288    virtual void setExcludedDevices(const Vector<String8>& devices);
289
290    virtual int32_t getScanCodeState(int32_t deviceId, int32_t scanCode) const;
291    virtual int32_t getKeyCodeState(int32_t deviceId, int32_t keyCode) const;
292    virtual int32_t getSwitchState(int32_t deviceId, int32_t sw) const;
293    virtual status_t getAbsoluteAxisValue(int32_t deviceId, int32_t axis, int32_t* outValue) const;
294
295    virtual bool markSupportedKeyCodes(int32_t deviceId, size_t numCodes,
296            const int32_t* keyCodes, uint8_t* outFlags) const;
297
298    virtual size_t getEvents(int timeoutMillis, RawEvent* buffer, size_t bufferSize);
299
300    virtual bool hasScanCode(int32_t deviceId, int32_t scanCode) const;
301    virtual bool hasLed(int32_t deviceId, int32_t led) const;
302    virtual void setLedState(int32_t deviceId, int32_t led, bool on);
303
304    virtual void getVirtualKeyDefinitions(int32_t deviceId,
305            Vector<VirtualKeyDefinition>& outVirtualKeys) const;
306
307    virtual sp<KeyCharacterMap> getKeyCharacterMap(int32_t deviceId) const;
308    virtual bool setKeyboardLayoutOverlay(int32_t deviceId, const sp<KeyCharacterMap>& map);
309
310    virtual void vibrate(int32_t deviceId, nsecs_t duration);
311    virtual void cancelVibrate(int32_t deviceId);
312
313    virtual void requestReopenDevices();
314
315    virtual void wake();
316
317    virtual void dump(String8& dump);
318    virtual void monitor();
319
320protected:
321    virtual ~EventHub();
322
323private:
324    struct Device {
325        Device* next;
326
327        int fd; // may be -1 if device is virtual
328        const int32_t id;
329        const String8 path;
330        const InputDeviceIdentifier identifier;
331
332        uint32_t classes;
333
334        uint8_t keyBitmask[(KEY_MAX + 1) / 8];
335        uint8_t absBitmask[(ABS_MAX + 1) / 8];
336        uint8_t relBitmask[(REL_MAX + 1) / 8];
337        uint8_t swBitmask[(SW_MAX + 1) / 8];
338        uint8_t ledBitmask[(LED_MAX + 1) / 8];
339        uint8_t ffBitmask[(FF_MAX + 1) / 8];
340        uint8_t propBitmask[(INPUT_PROP_MAX + 1) / 8];
341
342        String8 configurationFile;
343        PropertyMap* configuration;
344        VirtualKeyMap* virtualKeyMap;
345        KeyMap keyMap;
346
347        sp<KeyCharacterMap> overlayKeyMap;
348        sp<KeyCharacterMap> combinedKeyMap;
349
350        bool ffEffectPlaying;
351        int16_t ffEffectId; // initially -1
352
353        int32_t controllerNumber;
354
355        int32_t timestampOverrideSec;
356        int32_t timestampOverrideUsec;
357
358        Device(int fd, int32_t id, const String8& path, const InputDeviceIdentifier& identifier);
359        ~Device();
360
361        void close();
362
363        inline bool isVirtual() const { return fd < 0; }
364
365        const sp<KeyCharacterMap>& getKeyCharacterMap() const {
366            if (combinedKeyMap != NULL) {
367                return combinedKeyMap;
368            }
369            return keyMap.keyCharacterMap;
370        }
371    };
372
373    status_t openDeviceLocked(const char *devicePath);
374    void createVirtualKeyboardLocked();
375    void addDeviceLocked(Device* device);
376    void assignDescriptorLocked(InputDeviceIdentifier& identifier);
377
378    status_t closeDeviceByPathLocked(const char *devicePath);
379    void closeDeviceLocked(Device* device);
380    void closeAllDevicesLocked();
381
382    status_t scanDirLocked(const char *dirname);
383    void scanDevicesLocked();
384    status_t readNotifyLocked();
385
386    Device* getDeviceByDescriptorLocked(String8& descriptor) const;
387    Device* getDeviceLocked(int32_t deviceId) const;
388    Device* getDeviceByPathLocked(const char* devicePath) const;
389
390    bool hasKeycodeLocked(Device* device, int keycode) const;
391
392    void loadConfigurationLocked(Device* device);
393    status_t loadVirtualKeyMapLocked(Device* device);
394    status_t loadKeyMapLocked(Device* device);
395
396    bool isExternalDeviceLocked(Device* device);
397
398    int32_t getNextControllerNumberLocked(Device* device);
399    void releaseControllerNumberLocked(Device* device);
400    void setLedForController(Device* device);
401
402    status_t mapLed(Device* device, int32_t led, int32_t* outScanCode) const;
403    void setLedStateLocked(Device* device, int32_t led, bool on);
404
405    // Protect all internal state.
406    mutable Mutex mLock;
407
408    // The actual id of the built-in keyboard, or NO_BUILT_IN_KEYBOARD if none.
409    // EventHub remaps the built-in keyboard to id 0 externally as required by the API.
410    enum {
411        // Must not conflict with any other assigned device ids, including
412        // the virtual keyboard id (-1).
413        NO_BUILT_IN_KEYBOARD = -2,
414    };
415    int32_t mBuiltInKeyboardId;
416
417    int32_t mNextDeviceId;
418
419    BitSet32 mControllerNumbers;
420
421    KeyedVector<int32_t, Device*> mDevices;
422
423    Device *mOpeningDevices;
424    Device *mClosingDevices;
425
426    bool mNeedToSendFinishedDeviceScan;
427    bool mNeedToReopenDevices;
428    bool mNeedToScanDevices;
429    Vector<String8> mExcludedDevices;
430
431    int mEpollFd;
432    int mINotifyFd;
433    int mWakeReadPipeFd;
434    int mWakeWritePipeFd;
435
436    // Ids used for epoll notifications not associated with devices.
437    static const uint32_t EPOLL_ID_INOTIFY = 0x80000001;
438    static const uint32_t EPOLL_ID_WAKE = 0x80000002;
439
440    // Epoll FD list size hint.
441    static const int EPOLL_SIZE_HINT = 8;
442
443    // Maximum number of signalled FDs to handle at a time.
444    static const int EPOLL_MAX_EVENTS = 16;
445
446    // The array of pending epoll events and the index of the next event to be handled.
447    struct epoll_event mPendingEventItems[EPOLL_MAX_EVENTS];
448    size_t mPendingEventCount;
449    size_t mPendingEventIndex;
450    bool mPendingINotify;
451
452    bool mUsingEpollWakeup;
453};
454
455}; // namespace android
456
457#endif // _RUNTIME_EVENT_HUB_H
458