1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
|
/*
* 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.
*/
//
// Handle events, like key input and vsync.
//
// The goal is to provide an optimized solution for Linux, not an
// implementation that works well across all platforms. We expect
// events to arrive on file descriptors, so that we can use a select()
// select() call to sleep.
//
// We can't select() on anything but network sockets in Windows, so we
// provide an alternative implementation of waitEvent for that platform.
//
#define LOG_TAG "EventHub"
//#define LOG_NDEBUG 0
#include "EventHub.h"
#include <hardware_legacy/power.h>
#include <cutils/properties.h>
#include <utils/Log.h>
#include <utils/Timers.h>
#include <utils/threads.h>
#include <utils/Errors.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <memory.h>
#include <errno.h>
#include <assert.h>
#include <ui/KeyLayoutMap.h>
#include <ui/KeyCharacterMap.h>
#include <ui/VirtualKeyMap.h>
#include <string.h>
#include <stdint.h>
#include <dirent.h>
#ifdef HAVE_INOTIFY
# include <sys/inotify.h>
#endif
#ifdef HAVE_ANDROID_OS
# include <sys/limits.h> /* not part of Linux */
#endif
#include <sys/poll.h>
#include <sys/ioctl.h>
/* this macro is used to tell if "bit" is set in "array"
* it selects a byte from the array, and does a boolean AND
* operation with a byte that only has the relevant bit set.
* eg. to check for the 12th bit, we do (array[1] & 1<<4)
*/
#define test_bit(bit, array) (array[bit/8] & (1<<(bit%8)))
/* this macro computes the number of bytes needed to represent a bit array of the specified size */
#define sizeof_bit_array(bits) ((bits + 7) / 8)
// Fd at index 0 is always reserved for inotify
#define FIRST_ACTUAL_DEVICE_INDEX 1
#define INDENT " "
#define INDENT2 " "
#define INDENT3 " "
namespace android {
static const char *WAKE_LOCK_ID = "KeyEvents";
static const char *DEVICE_PATH = "/dev/input";
/* return the larger integer */
static inline int max(int v1, int v2)
{
return (v1 > v2) ? v1 : v2;
}
static inline const char* toString(bool value) {
return value ? "true" : "false";
}
// --- EventHub::Device ---
EventHub::Device::Device(int fd, int32_t id, const String8& path,
const InputDeviceIdentifier& identifier) :
next(NULL),
fd(fd), id(id), path(path), identifier(identifier),
classes(0), keyBitmask(NULL), relBitmask(NULL),
configuration(NULL), virtualKeyMap(NULL) {
}
EventHub::Device::~Device() {
close();
delete[] keyBitmask;
delete[] relBitmask;
delete configuration;
delete virtualKeyMap;
}
void EventHub::Device::close() {
if (fd >= 0) {
::close(fd);
fd = -1;
}
}
// --- EventHub ---
EventHub::EventHub(void) :
mError(NO_INIT), mBuiltInKeyboardId(-1), mNextDeviceId(1),
mOpeningDevices(0), mClosingDevices(0),
mOpened(false), mNeedToSendFinishedDeviceScan(false),
mInputBufferIndex(0), mInputBufferCount(0), mInputFdIndex(0) {
acquire_wake_lock(PARTIAL_WAKE_LOCK, WAKE_LOCK_ID);
memset(mSwitches, 0, sizeof(mSwitches));
}
EventHub::~EventHub(void) {
release_wake_lock(WAKE_LOCK_ID);
// we should free stuff here...
}
status_t EventHub::errorCheck() const {
return mError;
}
String8 EventHub::getDeviceName(int32_t deviceId) const {
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device == NULL) return String8();
return device->identifier.name;
}
uint32_t EventHub::getDeviceClasses(int32_t deviceId) const {
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device == NULL) return 0;
return device->classes;
}
void EventHub::getConfiguration(int32_t deviceId, PropertyMap* outConfiguration) const {
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device && device->configuration) {
*outConfiguration = *device->configuration;
} else {
outConfiguration->clear();
}
}
status_t EventHub::getAbsoluteAxisInfo(int32_t deviceId, int axis,
RawAbsoluteAxisInfo* outAxisInfo) const {
outAxisInfo->clear();
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device == NULL) return -1;
struct input_absinfo info;
if(ioctl(device->fd, EVIOCGABS(axis), &info)) {
LOGW("Error reading absolute controller %d for device %s fd %d\n",
axis, device->identifier.name.string(), device->fd);
return -errno;
}
if (info.minimum != info.maximum) {
outAxisInfo->valid = true;
outAxisInfo->minValue = info.minimum;
outAxisInfo->maxValue = info.maximum;
outAxisInfo->flat = info.flat;
outAxisInfo->fuzz = info.fuzz;
}
return OK;
}
bool EventHub::hasRelativeAxis(int32_t deviceId, int axis) const {
if (axis >= 0 && axis <= REL_MAX) {
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device && device->relBitmask) {
return test_bit(axis, device->relBitmask);
}
}
return false;
}
int32_t EventHub::getScanCodeState(int32_t deviceId, int32_t scanCode) const {
if (scanCode >= 0 && scanCode <= KEY_MAX) {
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device != NULL) {
return getScanCodeStateLocked(device, scanCode);
}
}
return AKEY_STATE_UNKNOWN;
}
int32_t EventHub::getScanCodeStateLocked(Device* device, int32_t scanCode) const {
uint8_t key_bitmask[sizeof_bit_array(KEY_MAX + 1)];
memset(key_bitmask, 0, sizeof(key_bitmask));
if (ioctl(device->fd,
EVIOCGKEY(sizeof(key_bitmask)), key_bitmask) >= 0) {
return test_bit(scanCode, key_bitmask) ? AKEY_STATE_DOWN : AKEY_STATE_UP;
}
return AKEY_STATE_UNKNOWN;
}
int32_t EventHub::getKeyCodeState(int32_t deviceId, int32_t keyCode) const {
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device != NULL) {
return getKeyCodeStateLocked(device, keyCode);
}
return AKEY_STATE_UNKNOWN;
}
int32_t EventHub::getKeyCodeStateLocked(Device* device, int32_t keyCode) const {
if (!device->keyMap.haveKeyLayout()) {
return AKEY_STATE_UNKNOWN;
}
Vector<int32_t> scanCodes;
device->keyMap.keyLayoutMap->findScanCodesForKey(keyCode, &scanCodes);
uint8_t key_bitmask[sizeof_bit_array(KEY_MAX + 1)];
memset(key_bitmask, 0, sizeof(key_bitmask));
if (ioctl(device->fd, EVIOCGKEY(sizeof(key_bitmask)), key_bitmask) >= 0) {
#if 0
for (size_t i=0; i<=KEY_MAX; i++) {
LOGI("(Scan code %d: down=%d)", i, test_bit(i, key_bitmask));
}
#endif
const size_t N = scanCodes.size();
for (size_t i=0; i<N && i<=KEY_MAX; i++) {
int32_t sc = scanCodes.itemAt(i);
//LOGI("Code %d: down=%d", sc, test_bit(sc, key_bitmask));
if (sc >= 0 && sc <= KEY_MAX && test_bit(sc, key_bitmask)) {
return AKEY_STATE_DOWN;
}
}
return AKEY_STATE_UP;
}
return AKEY_STATE_UNKNOWN;
}
int32_t EventHub::getSwitchState(int32_t deviceId, int32_t sw) const {
if (sw >= 0 && sw <= SW_MAX) {
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device != NULL) {
return getSwitchStateLocked(device, sw);
}
}
return AKEY_STATE_UNKNOWN;
}
int32_t EventHub::getSwitchStateLocked(Device* device, int32_t sw) const {
uint8_t sw_bitmask[sizeof_bit_array(SW_MAX + 1)];
memset(sw_bitmask, 0, sizeof(sw_bitmask));
if (ioctl(device->fd,
EVIOCGSW(sizeof(sw_bitmask)), sw_bitmask) >= 0) {
return test_bit(sw, sw_bitmask) ? AKEY_STATE_DOWN : AKEY_STATE_UP;
}
return AKEY_STATE_UNKNOWN;
}
bool EventHub::markSupportedKeyCodes(int32_t deviceId, size_t numCodes,
const int32_t* keyCodes, uint8_t* outFlags) const {
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device != NULL) {
return markSupportedKeyCodesLocked(device, numCodes, keyCodes, outFlags);
}
return false;
}
bool EventHub::markSupportedKeyCodesLocked(Device* device, size_t numCodes,
const int32_t* keyCodes, uint8_t* outFlags) const {
if (!device->keyMap.haveKeyLayout() || !device->keyBitmask) {
return false;
}
Vector<int32_t> scanCodes;
for (size_t codeIndex = 0; codeIndex < numCodes; codeIndex++) {
scanCodes.clear();
status_t err = device->keyMap.keyLayoutMap->findScanCodesForKey(
keyCodes[codeIndex], &scanCodes);
if (! err) {
// check the possible scan codes identified by the layout map against the
// map of codes actually emitted by the driver
for (size_t sc = 0; sc < scanCodes.size(); sc++) {
if (test_bit(scanCodes[sc], device->keyBitmask)) {
outFlags[codeIndex] = 1;
break;
}
}
}
}
return true;
}
status_t EventHub::mapKey(int32_t deviceId, int scancode,
int32_t* outKeycode, uint32_t* outFlags) const
{
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device && device->keyMap.haveKeyLayout()) {
status_t err = device->keyMap.keyLayoutMap->mapKey(scancode, outKeycode, outFlags);
if (err == NO_ERROR) {
return NO_ERROR;
}
}
if (mBuiltInKeyboardId != -1) {
device = getDeviceLocked(mBuiltInKeyboardId);
if (device && device->keyMap.haveKeyLayout()) {
status_t err = device->keyMap.keyLayoutMap->mapKey(scancode, outKeycode, outFlags);
if (err == NO_ERROR) {
return NO_ERROR;
}
}
}
*outKeycode = 0;
*outFlags = 0;
return NAME_NOT_FOUND;
}
status_t EventHub::mapAxis(int32_t deviceId, int scancode, AxisInfo* outAxisInfo) const
{
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device && device->keyMap.haveKeyLayout()) {
status_t err = device->keyMap.keyLayoutMap->mapAxis(scancode, outAxisInfo);
if (err == NO_ERROR) {
return NO_ERROR;
}
}
if (mBuiltInKeyboardId != -1) {
device = getDeviceLocked(mBuiltInKeyboardId);
if (device && device->keyMap.haveKeyLayout()) {
status_t err = device->keyMap.keyLayoutMap->mapAxis(scancode, outAxisInfo);
if (err == NO_ERROR) {
return NO_ERROR;
}
}
}
return NAME_NOT_FOUND;
}
void EventHub::addExcludedDevice(const char* deviceName)
{
AutoMutex _l(mLock);
String8 name(deviceName);
mExcludedDevices.push_back(name);
}
bool EventHub::hasLed(int32_t deviceId, int32_t led) const {
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device) {
uint8_t bitmask[sizeof_bit_array(LED_MAX + 1)];
memset(bitmask, 0, sizeof(bitmask));
if (ioctl(device->fd, EVIOCGBIT(EV_LED, sizeof(bitmask)), bitmask) >= 0) {
if (test_bit(led, bitmask)) {
return true;
}
}
}
return false;
}
void EventHub::setLedState(int32_t deviceId, int32_t led, bool on) {
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device) {
struct input_event ev;
ev.time.tv_sec = 0;
ev.time.tv_usec = 0;
ev.type = EV_LED;
ev.code = led;
ev.value = on ? 1 : 0;
ssize_t nWrite;
do {
nWrite = write(device->fd, &ev, sizeof(struct input_event));
} while (nWrite == -1 && errno == EINTR);
}
}
void EventHub::getVirtualKeyDefinitions(int32_t deviceId,
Vector<VirtualKeyDefinition>& outVirtualKeys) const {
outVirtualKeys.clear();
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device && device->virtualKeyMap) {
outVirtualKeys.appendVector(device->virtualKeyMap->getVirtualKeys());
}
}
EventHub::Device* EventHub::getDeviceLocked(int32_t deviceId) const {
if (deviceId == 0) {
deviceId = mBuiltInKeyboardId;
}
size_t numDevices = mDevices.size();
for (size_t i = FIRST_ACTUAL_DEVICE_INDEX; i < numDevices; i++) {
Device* device = mDevices[i];
if (device->id == deviceId) {
return device;
}
}
return NULL;
}
bool EventHub::getEvent(RawEvent* outEvent) {
outEvent->deviceId = 0;
outEvent->type = 0;
outEvent->scanCode = 0;
outEvent->keyCode = 0;
outEvent->flags = 0;
outEvent->value = 0;
outEvent->when = 0;
// Note that we only allow one caller to getEvent(), so don't need
// to do locking here... only when adding/removing devices.
if (!mOpened) {
mError = openPlatformInput() ? NO_ERROR : UNKNOWN_ERROR;
mOpened = true;
mNeedToSendFinishedDeviceScan = true;
}
for (;;) {
// Report any devices that had last been added/removed.
if (mClosingDevices != NULL) {
Device* device = mClosingDevices;
LOGV("Reporting device closed: id=%d, name=%s\n",
device->id, device->path.string());
mClosingDevices = device->next;
if (device->id == mBuiltInKeyboardId) {
outEvent->deviceId = 0;
} else {
outEvent->deviceId = device->id;
}
outEvent->type = DEVICE_REMOVED;
outEvent->when = systemTime(SYSTEM_TIME_MONOTONIC);
delete device;
mNeedToSendFinishedDeviceScan = true;
return true;
}
if (mOpeningDevices != NULL) {
Device* device = mOpeningDevices;
LOGV("Reporting device opened: id=%d, name=%s\n",
device->id, device->path.string());
mOpeningDevices = device->next;
if (device->id == mBuiltInKeyboardId) {
outEvent->deviceId = 0;
} else {
outEvent->deviceId = device->id;
}
outEvent->type = DEVICE_ADDED;
outEvent->when = systemTime(SYSTEM_TIME_MONOTONIC);
mNeedToSendFinishedDeviceScan = true;
return true;
}
if (mNeedToSendFinishedDeviceScan) {
mNeedToSendFinishedDeviceScan = false;
outEvent->type = FINISHED_DEVICE_SCAN;
outEvent->when = systemTime(SYSTEM_TIME_MONOTONIC);
return true;
}
// Grab the next input event.
bool deviceWasRemoved = false;
for (;;) {
// Consume buffered input events, if any.
if (mInputBufferIndex < mInputBufferCount) {
const struct input_event& iev = mInputBufferData[mInputBufferIndex++];
const Device* device = mDevices[mInputFdIndex];
LOGV("%s got: t0=%d, t1=%d, type=%d, code=%d, v=%d", device->path.string(),
(int) iev.time.tv_sec, (int) iev.time.tv_usec, iev.type, iev.code, iev.value);
if (device->id == mBuiltInKeyboardId) {
outEvent->deviceId = 0;
} else {
outEvent->deviceId = device->id;
}
outEvent->type = iev.type;
outEvent->scanCode = iev.code;
outEvent->flags = 0;
if (iev.type == EV_KEY) {
outEvent->keyCode = AKEYCODE_UNKNOWN;
if (device->keyMap.haveKeyLayout()) {
status_t err = device->keyMap.keyLayoutMap->mapKey(iev.code,
&outEvent->keyCode, &outEvent->flags);
LOGV("iev.code=%d keyCode=%d flags=0x%08x err=%d\n",
iev.code, outEvent->keyCode, outEvent->flags, err);
}
} else {
outEvent->keyCode = iev.code;
}
outEvent->value = iev.value;
// Use an event timestamp in the same timebase as
// java.lang.System.nanoTime() and android.os.SystemClock.uptimeMillis()
// as expected by the rest of the system.
outEvent->when = systemTime(SYSTEM_TIME_MONOTONIC);
return true;
}
// Finish reading all events from devices identified in previous poll().
// This code assumes that mInputDeviceIndex is initially 0 and that the
// revents member of pollfd is initialized to 0 when the device is first added.
// Since mFds[0] is used for inotify, we process regular events starting at index 1.
mInputFdIndex += 1;
if (mInputFdIndex >= mFds.size()) {
break;
}
const struct pollfd& pfd = mFds[mInputFdIndex];
if (pfd.revents & POLLIN) {
int32_t readSize = read(pfd.fd, mInputBufferData,
sizeof(struct input_event) * INPUT_BUFFER_SIZE);
if (readSize < 0) {
if (errno == ENODEV) {
deviceWasRemoved = true;
break;
}
if (errno != EAGAIN && errno != EINTR) {
LOGW("could not get event (errno=%d)", errno);
}
} else if ((readSize % sizeof(struct input_event)) != 0) {
LOGE("could not get event (wrong size: %d)", readSize);
} else {
mInputBufferCount = size_t(readSize) / sizeof(struct input_event);
mInputBufferIndex = 0;
}
}
}
// Handle the case where a device has been removed but INotify has not yet noticed.
if (deviceWasRemoved) {
AutoMutex _l(mLock);
closeDeviceAtIndexLocked(mInputFdIndex);
continue; // report added or removed devices immediately
}
#if HAVE_INOTIFY
// readNotify() will modify mFDs and mFDCount, so this must be done after
// processing all other events.
if(mFds[0].revents & POLLIN) {
readNotify(mFds[0].fd);
mFds.editItemAt(0).revents = 0;
continue; // report added or removed devices immediately
}
#endif
// Poll for events. Mind the wake lock dance!
// We hold a wake lock at all times except during poll(). This works due to some
// subtle choreography. When a device driver has pending (unread) events, it acquires
// a kernel wake lock. However, once the last pending event has been read, the device
// driver will release the kernel wake lock. To prevent the system from going to sleep
// when this happens, the EventHub holds onto its own user wake lock while the client
// is processing events. Thus the system can only sleep if there are no events
// pending or currently being processed.
release_wake_lock(WAKE_LOCK_ID);
int pollResult = poll(mFds.editArray(), mFds.size(), -1);
acquire_wake_lock(PARTIAL_WAKE_LOCK, WAKE_LOCK_ID);
if (pollResult <= 0) {
if (errno != EINTR) {
LOGW("poll failed (errno=%d)\n", errno);
usleep(100000);
}
}
// Prepare to process all of the FDs we just polled.
mInputFdIndex = 0;
}
}
/*
* Open the platform-specific input device.
*/
bool EventHub::openPlatformInput(void) {
/*
* Open platform-specific input device(s).
*/
int res, fd;
#ifdef HAVE_INOTIFY
fd = inotify_init();
res = inotify_add_watch(fd, DEVICE_PATH, IN_DELETE | IN_CREATE);
if(res < 0) {
LOGE("could not add watch for %s, %s\n", DEVICE_PATH, strerror(errno));
}
#else
/*
* The code in EventHub::getEvent assumes that mFDs[0] is an inotify fd.
* We allocate space for it and set it to something invalid.
*/
fd = -1;
#endif
// Reserve fd index 0 for inotify.
struct pollfd pollfd;
pollfd.fd = fd;
pollfd.events = POLLIN;
pollfd.revents = 0;
mFds.push(pollfd);
mDevices.push(NULL);
res = scanDir(DEVICE_PATH);
if(res < 0) {
LOGE("scan dir failed for %s\n", DEVICE_PATH);
}
return true;
}
// ----------------------------------------------------------------------------
static bool containsNonZeroByte(const uint8_t* array, uint32_t startIndex, uint32_t endIndex) {
const uint8_t* end = array + endIndex;
array += startIndex;
while (array != end) {
if (*(array++) != 0) {
return true;
}
}
return false;
}
static const int32_t GAMEPAD_KEYCODES[] = {
AKEYCODE_BUTTON_A, AKEYCODE_BUTTON_B, AKEYCODE_BUTTON_C,
AKEYCODE_BUTTON_X, AKEYCODE_BUTTON_Y, AKEYCODE_BUTTON_Z,
AKEYCODE_BUTTON_L1, AKEYCODE_BUTTON_R1,
AKEYCODE_BUTTON_L2, AKEYCODE_BUTTON_R2,
AKEYCODE_BUTTON_THUMBL, AKEYCODE_BUTTON_THUMBR,
AKEYCODE_BUTTON_START, AKEYCODE_BUTTON_SELECT, AKEYCODE_BUTTON_MODE,
AKEYCODE_BUTTON_1, AKEYCODE_BUTTON_2, AKEYCODE_BUTTON_3, AKEYCODE_BUTTON_4,
AKEYCODE_BUTTON_5, AKEYCODE_BUTTON_6, AKEYCODE_BUTTON_7, AKEYCODE_BUTTON_8,
AKEYCODE_BUTTON_9, AKEYCODE_BUTTON_10, AKEYCODE_BUTTON_11, AKEYCODE_BUTTON_12,
AKEYCODE_BUTTON_13, AKEYCODE_BUTTON_14, AKEYCODE_BUTTON_15, AKEYCODE_BUTTON_16,
};
int EventHub::openDevice(const char *devicePath) {
char buffer[80];
LOGV("Opening device: %s", devicePath);
AutoMutex _l(mLock);
int fd = open(devicePath, O_RDWR);
if(fd < 0) {
LOGE("could not open %s, %s\n", devicePath, strerror(errno));
return -1;
}
InputDeviceIdentifier identifier;
// Get device name.
if(ioctl(fd, EVIOCGNAME(sizeof(buffer) - 1), &buffer) < 1) {
//fprintf(stderr, "could not get device name for %s, %s\n", devicePath, strerror(errno));
} else {
buffer[sizeof(buffer) - 1] = '\0';
identifier.name.setTo(buffer);
}
// Check to see if the device is on our excluded list
List<String8>::iterator iter = mExcludedDevices.begin();
List<String8>::iterator end = mExcludedDevices.end();
for ( ; iter != end; iter++) {
const char* test = *iter;
if (identifier.name == test) {
LOGI("ignoring event id %s driver %s\n", devicePath, test);
close(fd);
return -1;
}
}
// Get device driver version.
int driverVersion;
if(ioctl(fd, EVIOCGVERSION, &driverVersion)) {
LOGE("could not get driver version for %s, %s\n", devicePath, strerror(errno));
close(fd);
return -1;
}
// Get device identifier.
struct input_id inputId;
if(ioctl(fd, EVIOCGID, &inputId)) {
LOGE("could not get device input id for %s, %s\n", devicePath, strerror(errno));
close(fd);
return -1;
}
identifier.bus = inputId.bustype;
identifier.product = inputId.product;
identifier.vendor = inputId.vendor;
identifier.version = inputId.version;
// Get device physical location.
if(ioctl(fd, EVIOCGPHYS(sizeof(buffer) - 1), &buffer) < 1) {
//fprintf(stderr, "could not get location for %s, %s\n", devicePath, strerror(errno));
} else {
buffer[sizeof(buffer) - 1] = '\0';
identifier.location.setTo(buffer);
}
// Get device unique id.
if(ioctl(fd, EVIOCGUNIQ(sizeof(buffer) - 1), &buffer) < 1) {
//fprintf(stderr, "could not get idstring for %s, %s\n", devicePath, strerror(errno));
} else {
buffer[sizeof(buffer) - 1] = '\0';
identifier.uniqueId.setTo(buffer);
}
// Make file descriptor non-blocking for use with poll().
if (fcntl(fd, F_SETFL, O_NONBLOCK)) {
LOGE("Error %d making device file descriptor non-blocking.", errno);
close(fd);
return -1;
}
// Allocate device. (The device object takes ownership of the fd at this point.)
int32_t deviceId = mNextDeviceId++;
Device* device = new Device(fd, deviceId, String8(devicePath), identifier);
#if 0
LOGI("add device %d: %s\n", deviceId, devicePath);
LOGI(" bus: %04x\n"
" vendor %04x\n"
" product %04x\n"
" version %04x\n",
identifier.bus, identifier.vendor, identifier.product, identifier.version);
LOGI(" name: \"%s\"\n", identifier.name.string());
LOGI(" location: \"%s\"\n", identifier.location.string());
LOGI(" unique id: \"%s\"\n", identifier.uniqueId.string());
LOGI(" driver: v%d.%d.%d\n",
driverVersion >> 16, (driverVersion >> 8) & 0xff, driverVersion & 0xff);
#endif
// Load the configuration file for the device.
loadConfiguration(device);
// Figure out the kinds of events the device reports.
uint8_t key_bitmask[sizeof_bit_array(KEY_MAX + 1)];
memset(key_bitmask, 0, sizeof(key_bitmask));
ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(key_bitmask)), key_bitmask);
uint8_t abs_bitmask[sizeof_bit_array(ABS_MAX + 1)];
memset(abs_bitmask, 0, sizeof(abs_bitmask));
ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(abs_bitmask)), abs_bitmask);
uint8_t rel_bitmask[sizeof_bit_array(REL_MAX + 1)];
memset(rel_bitmask, 0, sizeof(rel_bitmask));
ioctl(fd, EVIOCGBIT(EV_REL, sizeof(rel_bitmask)), rel_bitmask);
uint8_t sw_bitmask[sizeof_bit_array(SW_MAX + 1)];
memset(sw_bitmask, 0, sizeof(sw_bitmask));
ioctl(fd, EVIOCGBIT(EV_SW, sizeof(sw_bitmask)), sw_bitmask);
device->keyBitmask = new uint8_t[sizeof(key_bitmask)];
if (device->keyBitmask != NULL) {
memcpy(device->keyBitmask, key_bitmask, sizeof(key_bitmask));
} else {
delete device;
LOGE("out of memory allocating key bitmask");
return -1;
}
device->relBitmask = new uint8_t[sizeof(rel_bitmask)];
if (device->relBitmask != NULL) {
memcpy(device->relBitmask, rel_bitmask, sizeof(rel_bitmask));
} else {
delete device;
LOGE("out of memory allocating rel bitmask");
return -1;
}
// See if this is a keyboard. Ignore everything in the button range except for
// joystick and gamepad buttons which are handled like keyboards for the most part.
bool haveKeyboardKeys = containsNonZeroByte(key_bitmask, 0, sizeof_bit_array(BTN_MISC))
|| containsNonZeroByte(key_bitmask, sizeof_bit_array(KEY_OK),
sizeof_bit_array(KEY_MAX + 1));
bool haveGamepadButtons = containsNonZeroByte(key_bitmask, sizeof_bit_array(BTN_MISC),
sizeof_bit_array(BTN_MOUSE))
|| containsNonZeroByte(key_bitmask, sizeof_bit_array(BTN_JOYSTICK),
sizeof_bit_array(BTN_DIGI));
if (haveKeyboardKeys || haveGamepadButtons) {
device->classes |= INPUT_DEVICE_CLASS_KEYBOARD;
}
// See if this is a cursor device such as a trackball or mouse.
if (test_bit(BTN_MOUSE, key_bitmask)
&& test_bit(REL_X, rel_bitmask)
&& test_bit(REL_Y, rel_bitmask)) {
device->classes |= INPUT_DEVICE_CLASS_CURSOR;
}
// See if this is a touch pad.
// Is this a new modern multi-touch driver?
if (test_bit(ABS_MT_POSITION_X, abs_bitmask)
&& test_bit(ABS_MT_POSITION_Y, abs_bitmask)) {
// Some joysticks such as the PS3 controller report axes that conflict
// with the ABS_MT range. Try to confirm that the device really is
// a touch screen.
if (test_bit(BTN_TOUCH, key_bitmask) || !haveGamepadButtons) {
device->classes |= INPUT_DEVICE_CLASS_TOUCH | INPUT_DEVICE_CLASS_TOUCH_MT;
}
// Is this an old style single-touch driver?
} else if (test_bit(BTN_TOUCH, key_bitmask)
&& test_bit(ABS_X, abs_bitmask)
&& test_bit(ABS_Y, abs_bitmask)) {
device->classes |= INPUT_DEVICE_CLASS_TOUCH;
}
// See if this device is a joystick.
// Ignore touchscreens because they use the same absolute axes for other purposes.
// Assumes that joysticks always have gamepad buttons in order to distinguish them
// from other devices such as accelerometers that also have absolute axes.
if (haveGamepadButtons
&& !(device->classes & INPUT_DEVICE_CLASS_TOUCH)
&& containsNonZeroByte(abs_bitmask, 0, sizeof_bit_array(ABS_MAX + 1))) {
device->classes |= INPUT_DEVICE_CLASS_JOYSTICK;
}
// figure out the switches this device reports
bool haveSwitches = false;
for (int i=0; i<EV_SW; i++) {
//LOGI("Device %d sw %d: has=%d", device->id, i, test_bit(i, sw_bitmask));
if (test_bit(i, sw_bitmask)) {
haveSwitches = true;
if (mSwitches[i] == 0) {
mSwitches[i] = device->id;
}
}
}
if (haveSwitches) {
device->classes |= INPUT_DEVICE_CLASS_SWITCH;
}
if ((device->classes & INPUT_DEVICE_CLASS_TOUCH)) {
// Load the virtual keys for the touch screen, if any.
// We do this now so that we can make sure to load the keymap if necessary.
status_t status = loadVirtualKeyMap(device);
if (!status) {
device->classes |= INPUT_DEVICE_CLASS_KEYBOARD;
}
}
// Load the key map.
// We need to do this for joysticks too because the key layout may specify axes.
status_t keyMapStatus = NAME_NOT_FOUND;
if (device->classes & (INPUT_DEVICE_CLASS_KEYBOARD | INPUT_DEVICE_CLASS_JOYSTICK)) {
// Load the keymap for the device.
keyMapStatus = loadKeyMap(device);
}
// Configure the keyboard, gamepad or virtual keyboard.
if (device->classes & INPUT_DEVICE_CLASS_KEYBOARD) {
// Set system properties for the keyboard.
setKeyboardProperties(device, false);
// Register the keyboard as a built-in keyboard if it is eligible.
if (!keyMapStatus
&& mBuiltInKeyboardId == -1
&& isEligibleBuiltInKeyboard(device->identifier,
device->configuration, &device->keyMap)) {
mBuiltInKeyboardId = device->id;
setKeyboardProperties(device, true);
}
// 'Q' key support = cheap test of whether this is an alpha-capable kbd
if (hasKeycodeLocked(device, AKEYCODE_Q)) {
device->classes |= INPUT_DEVICE_CLASS_ALPHAKEY;
}
// See if this device has a DPAD.
if (hasKeycodeLocked(device, AKEYCODE_DPAD_UP) &&
hasKeycodeLocked(device, AKEYCODE_DPAD_DOWN) &&
hasKeycodeLocked(device, AKEYCODE_DPAD_LEFT) &&
hasKeycodeLocked(device, AKEYCODE_DPAD_RIGHT) &&
hasKeycodeLocked(device, AKEYCODE_DPAD_CENTER)) {
device->classes |= INPUT_DEVICE_CLASS_DPAD;
}
// See if this device has a gamepad.
for (size_t i = 0; i < sizeof(GAMEPAD_KEYCODES)/sizeof(GAMEPAD_KEYCODES[0]); i++) {
if (hasKeycodeLocked(device, GAMEPAD_KEYCODES[i])) {
device->classes |= INPUT_DEVICE_CLASS_GAMEPAD;
break;
}
}
}
// If the device isn't recognized as something we handle, don't monitor it.
if (device->classes == 0) {
LOGV("Dropping device: id=%d, path='%s', name='%s'",
deviceId, devicePath, device->identifier.name.string());
delete device;
return -1;
}
// Determine whether the device is external or internal.
if (isExternalDevice(device)) {
device->classes |= INPUT_DEVICE_CLASS_EXTERNAL;
}
LOGI("New device: id=%d, fd=%d, path='%s', name='%s', classes=0x%x, "
"configuration='%s', keyLayout='%s', keyCharacterMap='%s', builtinKeyboard=%s",
deviceId, fd, devicePath, device->identifier.name.string(),
device->classes,
device->configurationFile.string(),
device->keyMap.keyLayoutFile.string(),
device->keyMap.keyCharacterMapFile.string(),
toString(mBuiltInKeyboardId == deviceId));
struct pollfd pollfd;
pollfd.fd = fd;
pollfd.events = POLLIN;
pollfd.revents = 0;
mFds.push(pollfd);
mDevices.push(device);
device->next = mOpeningDevices;
mOpeningDevices = device;
return 0;
}
void EventHub::loadConfiguration(Device* device) {
device->configurationFile = getInputDeviceConfigurationFilePathByDeviceIdentifier(
device->identifier, INPUT_DEVICE_CONFIGURATION_FILE_TYPE_CONFIGURATION);
if (device->configurationFile.isEmpty()) {
LOGD("No input device configuration file found for device '%s'.",
device->identifier.name.string());
} else {
status_t status = PropertyMap::load(device->configurationFile,
&device->configuration);
if (status) {
LOGE("Error loading input device configuration file for device '%s'. "
"Using default configuration.",
device->identifier.name.string());
}
}
}
status_t EventHub::loadVirtualKeyMap(Device* device) {
// The virtual key map is supplied by the kernel as a system board property file.
String8 path;
path.append("/sys/board_properties/virtualkeys.");
path.append(device->identifier.name);
if (access(path.string(), R_OK)) {
return NAME_NOT_FOUND;
}
return VirtualKeyMap::load(path, &device->virtualKeyMap);
}
status_t EventHub::loadKeyMap(Device* device) {
return device->keyMap.load(device->identifier, device->configuration);
}
void EventHub::setKeyboardProperties(Device* device, bool builtInKeyboard) {
int32_t id = builtInKeyboard ? 0 : device->id;
android::setKeyboardProperties(id, device->identifier,
device->keyMap.keyLayoutFile, device->keyMap.keyCharacterMapFile);
}
void EventHub::clearKeyboardProperties(Device* device, bool builtInKeyboard) {
int32_t id = builtInKeyboard ? 0 : device->id;
android::clearKeyboardProperties(id);
}
bool EventHub::isExternalDevice(Device* device) {
if (device->configuration) {
bool value;
if (device->configuration->tryGetProperty(String8("device.internal"), value)
&& value) {
return false;
}
}
return device->identifier.bus == BUS_USB || device->identifier.bus == BUS_BLUETOOTH;
}
bool EventHub::hasKeycodeLocked(Device* device, int keycode) const {
if (!device->keyMap.haveKeyLayout() || !device->keyBitmask) {
return false;
}
Vector<int32_t> scanCodes;
device->keyMap.keyLayoutMap->findScanCodesForKey(keycode, &scanCodes);
const size_t N = scanCodes.size();
for (size_t i=0; i<N && i<=KEY_MAX; i++) {
int32_t sc = scanCodes.itemAt(i);
if (sc >= 0 && sc <= KEY_MAX && test_bit(sc, device->keyBitmask)) {
return true;
}
}
return false;
}
int EventHub::closeDevice(const char *devicePath) {
AutoMutex _l(mLock);
for (size_t i = FIRST_ACTUAL_DEVICE_INDEX; i < mDevices.size(); i++) {
Device* device = mDevices[i];
if (device->path == devicePath) {
return closeDeviceAtIndexLocked(i);
}
}
LOGV("Remove device: %s not found, device may already have been removed.", devicePath);
return -1;
}
int EventHub::closeDeviceAtIndexLocked(int index) {
Device* device = mDevices[index];
LOGI("Removed device: path=%s name=%s id=%d fd=%d classes=0x%x\n",
device->path.string(), device->identifier.name.string(), device->id,
device->fd, device->classes);
for (int j=0; j<EV_SW; j++) {
if (mSwitches[j] == device->id) {
mSwitches[j] = 0;
}
}
if (device->id == mBuiltInKeyboardId) {
LOGW("built-in keyboard device %s (id=%d) is closing! the apps will not like this",
device->path.string(), mBuiltInKeyboardId);
mBuiltInKeyboardId = -1;
clearKeyboardProperties(device, true);
}
clearKeyboardProperties(device, false);
mFds.removeAt(index);
mDevices.removeAt(index);
device->close();
// Unlink for opening devices list if it is present.
Device* pred = NULL;
bool found = false;
for (Device* entry = mOpeningDevices; entry != NULL; ) {
if (entry == device) {
found = true;
break;
}
pred = entry;
entry = entry->next;
}
if (found) {
// Unlink the device from the opening devices list then delete it.
// We don't need to tell the client that the device was closed because
// it does not even know it was opened in the first place.
LOGI("Device %s was immediately closed after opening.", device->path.string());
if (pred) {
pred->next = device->next;
} else {
mOpeningDevices = device->next;
}
delete device;
} else {
// Link into closing devices list.
// The device will be deleted later after we have informed the client.
device->next = mClosingDevices;
mClosingDevices = device;
}
return 0;
}
int EventHub::readNotify(int nfd) {
#ifdef HAVE_INOTIFY
int res;
char devname[PATH_MAX];
char *filename;
char event_buf[512];
int event_size;
int event_pos = 0;
struct inotify_event *event;
LOGV("EventHub::readNotify nfd: %d\n", nfd);
res = read(nfd, event_buf, sizeof(event_buf));
if(res < (int)sizeof(*event)) {
if(errno == EINTR)
return 0;
LOGW("could not get event, %s\n", strerror(errno));
return 1;
}
//printf("got %d bytes of event information\n", res);
strcpy(devname, DEVICE_PATH);
filename = devname + strlen(devname);
*filename++ = '/';
while(res >= (int)sizeof(*event)) {
event = (struct inotify_event *)(event_buf + event_pos);
//printf("%d: %08x \"%s\"\n", event->wd, event->mask, event->len ? event->name : "");
if(event->len) {
strcpy(filename, event->name);
if(event->mask & IN_CREATE) {
openDevice(devname);
}
else {
closeDevice(devname);
}
}
event_size = sizeof(*event) + event->len;
res -= event_size;
event_pos += event_size;
}
#endif
return 0;
}
int EventHub::scanDir(const char *dirname)
{
char devname[PATH_MAX];
char *filename;
DIR *dir;
struct dirent *de;
dir = opendir(dirname);
if(dir == NULL)
return -1;
strcpy(devname, dirname);
filename = devname + strlen(devname);
*filename++ = '/';
while((de = readdir(dir))) {
if(de->d_name[0] == '.' &&
(de->d_name[1] == '\0' ||
(de->d_name[1] == '.' && de->d_name[2] == '\0')))
continue;
strcpy(filename, de->d_name);
openDevice(devname);
}
closedir(dir);
return 0;
}
void EventHub::dump(String8& dump) {
dump.append("Event Hub State:\n");
{ // acquire lock
AutoMutex _l(mLock);
dump.appendFormat(INDENT "BuiltInKeyboardId: %d\n", mBuiltInKeyboardId);
dump.append(INDENT "Devices:\n");
for (size_t i = FIRST_ACTUAL_DEVICE_INDEX; i < mDevices.size(); i++) {
const Device* device = mDevices[i];
if (device) {
if (mBuiltInKeyboardId == device->id) {
dump.appendFormat(INDENT2 "%d: %s (aka device 0 - built-in keyboard)\n",
device->id, device->identifier.name.string());
} else {
dump.appendFormat(INDENT2 "%d: %s\n", device->id,
device->identifier.name.string());
}
dump.appendFormat(INDENT3 "Classes: 0x%08x\n", device->classes);
dump.appendFormat(INDENT3 "Path: %s\n", device->path.string());
dump.appendFormat(INDENT3 "Location: %s\n", device->identifier.location.string());
dump.appendFormat(INDENT3 "UniqueId: %s\n", device->identifier.uniqueId.string());
dump.appendFormat(INDENT3 "Identifier: bus=0x%04x, vendor=0x%04x, "
"product=0x%04x, version=0x%04x\n",
device->identifier.bus, device->identifier.vendor,
device->identifier.product, device->identifier.version);
dump.appendFormat(INDENT3 "KeyLayoutFile: %s\n",
device->keyMap.keyLayoutFile.string());
dump.appendFormat(INDENT3 "KeyCharacterMapFile: %s\n",
device->keyMap.keyCharacterMapFile.string());
dump.appendFormat(INDENT3 "ConfigurationFile: %s\n",
device->configurationFile.string());
}
}
} // release lock
}
}; // namespace android
|