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comparison: widget/gonk/libui/EventHub.cpp

widget/gonk/libui/EventHub.cpp

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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 #define LOG_TAG "EventHub"
18
19 // #define LOG_NDEBUG 0
20 #include "cutils_log.h"
21
22 #include "EventHub.h"
23
24 #include <hardware_legacy/power.h>
25
26 #include <cutils/properties.h>
27 #include "cutils_log.h"
28 #include <utils/Timers.h>
29 #include <utils/threads.h>
30 #include <utils/Errors.h>
31
32 #include <stdlib.h>
33 #include <stdio.h>
34 #include <unistd.h>
35 #include <fcntl.h>
36 #include <memory.h>
37 #include <errno.h>
38 #include <assert.h>
39
40 #include "KeyLayoutMap.h"
41 #include "KeyCharacterMap.h"
42 #include "VirtualKeyMap.h"
43
44 #include <string.h>
45 #include <stdint.h>
46 #include <dirent.h>
47
48 #include <sys/inotify.h>
49 #include <sys/epoll.h>
50 #include <sys/ioctl.h>
51 #include <sys/limits.h>
52 #include <sha1.h>
53
54 /* this macro is used to tell if "bit" is set in "array"
55 * it selects a byte from the array, and does a boolean AND
56 * operation with a byte that only has the relevant bit set.
57 * eg. to check for the 12th bit, we do (array[1] & 1<<4)
58 */
59 #define test_bit(bit, array) (array[bit/8] & (1<<(bit%8)))
60
61 /* this macro computes the number of bytes needed to represent a bit array of the specified size */
62 #define sizeof_bit_array(bits) ((bits + 7) / 8)
63
64 #define INDENT " "
65 #define INDENT2 " "
66 #define INDENT3 " "
67
68 namespace android {
69
70 static const char *WAKE_LOCK_ID = "KeyEvents";
71 static const char *DEVICE_PATH = "/dev/input";
72
73 /* return the larger integer */
74 static inline int max(int v1, int v2)
75 {
76 return (v1 > v2) ? v1 : v2;
77 }
78
79 static inline const char* toString(bool value) {
80 return value ? "true" : "false";
81 }
82
83 static String8 sha1(const String8& in) {
84 SHA1_CTX ctx;
85 SHA1Init(&ctx);
86 SHA1Update(&ctx, reinterpret_cast<const u_char*>(in.string()), in.size());
87 u_char digest[SHA1_DIGEST_LENGTH];
88 SHA1Final(digest, &ctx);
89
90 String8 out;
91 for (size_t i = 0; i < SHA1_DIGEST_LENGTH; i++) {
92 out.appendFormat("%02x", digest[i]);
93 }
94 return out;
95 }
96
97 static void setDescriptor(InputDeviceIdentifier& identifier) {
98 // Compute a device descriptor that uniquely identifies the device.
99 // The descriptor is assumed to be a stable identifier. Its value should not
100 // change between reboots, reconnections, firmware updates or new releases of Android.
101 // Ideally, we also want the descriptor to be short and relatively opaque.
102 String8 rawDescriptor;
103 rawDescriptor.appendFormat(":%04x:%04x:", identifier.vendor, identifier.product);
104 if (!identifier.uniqueId.isEmpty()) {
105 rawDescriptor.append("uniqueId:");
106 rawDescriptor.append(identifier.uniqueId);
107 } if (identifier.vendor == 0 && identifier.product == 0) {
108 // If we don't know the vendor and product id, then the device is probably
109 // built-in so we need to rely on other information to uniquely identify
110 // the input device. Usually we try to avoid relying on the device name or
111 // location but for built-in input device, they are unlikely to ever change.
112 if (!identifier.name.isEmpty()) {
113 rawDescriptor.append("name:");
114 rawDescriptor.append(identifier.name);
115 } else if (!identifier.location.isEmpty()) {
116 rawDescriptor.append("location:");
117 rawDescriptor.append(identifier.location);
118 }
119 }
120 identifier.descriptor = sha1(rawDescriptor);
121 ALOGV("Created descriptor: raw=%s, cooked=%s", rawDescriptor.string(),
122 identifier.descriptor.string());
123 }
124
125 // --- Global Functions ---
126
127 uint32_t getAbsAxisUsage(int32_t axis, uint32_t deviceClasses) {
128 // Touch devices get dibs on touch-related axes.
129 if (deviceClasses & INPUT_DEVICE_CLASS_TOUCH) {
130 switch (axis) {
131 case ABS_X:
132 case ABS_Y:
133 case ABS_PRESSURE:
134 case ABS_TOOL_WIDTH:
135 case ABS_DISTANCE:
136 case ABS_TILT_X:
137 case ABS_TILT_Y:
138 case ABS_MT_SLOT:
139 case ABS_MT_TOUCH_MAJOR:
140 case ABS_MT_TOUCH_MINOR:
141 case ABS_MT_WIDTH_MAJOR:
142 case ABS_MT_WIDTH_MINOR:
143 case ABS_MT_ORIENTATION:
144 case ABS_MT_POSITION_X:
145 case ABS_MT_POSITION_Y:
146 case ABS_MT_TOOL_TYPE:
147 case ABS_MT_BLOB_ID:
148 case ABS_MT_TRACKING_ID:
149 case ABS_MT_PRESSURE:
150 case ABS_MT_DISTANCE:
151 return INPUT_DEVICE_CLASS_TOUCH;
152 }
153 }
154
155 // Joystick devices get the rest.
156 return deviceClasses & INPUT_DEVICE_CLASS_JOYSTICK;
157 }
158
159 // --- EventHub::Device ---
160
161 EventHub::Device::Device(int fd, int32_t id, const String8& path,
162 const InputDeviceIdentifier& identifier) :
163 next(NULL),
164 fd(fd), id(id), path(path), identifier(identifier),
165 classes(0), configuration(NULL), virtualKeyMap(NULL),
166 ffEffectPlaying(false), ffEffectId(-1),
167 timestampOverrideSec(0), timestampOverrideUsec(0) {
168 memset(keyBitmask, 0, sizeof(keyBitmask));
169 memset(absBitmask, 0, sizeof(absBitmask));
170 memset(relBitmask, 0, sizeof(relBitmask));
171 memset(swBitmask, 0, sizeof(swBitmask));
172 memset(ledBitmask, 0, sizeof(ledBitmask));
173 memset(ffBitmask, 0, sizeof(ffBitmask));
174 memset(propBitmask, 0, sizeof(propBitmask));
175 }
176
177 EventHub::Device::~Device() {
178 close();
179 delete configuration;
180 delete virtualKeyMap;
181 }
182
183 void EventHub::Device::close() {
184 if (fd >= 0) {
185 ::close(fd);
186 fd = -1;
187 }
188 }
189
190
191 // --- EventHub ---
192
193 const uint32_t EventHub::EPOLL_ID_INOTIFY;
194 const uint32_t EventHub::EPOLL_ID_WAKE;
195 const int EventHub::EPOLL_SIZE_HINT;
196 const int EventHub::EPOLL_MAX_EVENTS;
197
198 EventHub::EventHub(void) :
199 mBuiltInKeyboardId(NO_BUILT_IN_KEYBOARD), mNextDeviceId(1),
200 mOpeningDevices(0), mClosingDevices(0),
201 mNeedToSendFinishedDeviceScan(false),
202 mNeedToReopenDevices(false), mNeedToScanDevices(true),
203 mPendingEventCount(0), mPendingEventIndex(0), mPendingINotify(false) {
204 acquire_wake_lock(PARTIAL_WAKE_LOCK, WAKE_LOCK_ID);
205
206 mEpollFd = epoll_create(EPOLL_SIZE_HINT);
207 LOG_ALWAYS_FATAL_IF(mEpollFd < 0, "Could not create epoll instance. errno=%d", errno);
208
209 mINotifyFd = inotify_init();
210 int result = inotify_add_watch(mINotifyFd, DEVICE_PATH, IN_DELETE | IN_CREATE);
211 LOG_ALWAYS_FATAL_IF(result < 0, "Could not register INotify for %s. errno=%d",
212 DEVICE_PATH, errno);
213
214 struct epoll_event eventItem;
215 memset(&eventItem, 0, sizeof(eventItem));
216 eventItem.events = EPOLLIN;
217 eventItem.data.u32 = EPOLL_ID_INOTIFY;
218 result = epoll_ctl(mEpollFd, EPOLL_CTL_ADD, mINotifyFd, &eventItem);
219 LOG_ALWAYS_FATAL_IF(result != 0, "Could not add INotify to epoll instance. errno=%d", errno);
220
221 int wakeFds[2];
222 result = pipe(wakeFds);
223 LOG_ALWAYS_FATAL_IF(result != 0, "Could not create wake pipe. errno=%d", errno);
224
225 mWakeReadPipeFd = wakeFds[0];
226 mWakeWritePipeFd = wakeFds[1];
227
228 result = fcntl(mWakeReadPipeFd, F_SETFL, O_NONBLOCK);
229 LOG_ALWAYS_FATAL_IF(result != 0, "Could not make wake read pipe non-blocking. errno=%d",
230 errno);
231
232 result = fcntl(mWakeWritePipeFd, F_SETFL, O_NONBLOCK);
233 LOG_ALWAYS_FATAL_IF(result != 0, "Could not make wake write pipe non-blocking. errno=%d",
234 errno);
235
236 eventItem.data.u32 = EPOLL_ID_WAKE;
237 result = epoll_ctl(mEpollFd, EPOLL_CTL_ADD, mWakeReadPipeFd, &eventItem);
238 LOG_ALWAYS_FATAL_IF(result != 0, "Could not add wake read pipe to epoll instance. errno=%d",
239 errno);
240 }
241
242 EventHub::~EventHub(void) {
243 closeAllDevicesLocked();
244
245 while (mClosingDevices) {
246 Device* device = mClosingDevices;
247 mClosingDevices = device->next;
248 delete device;
249 }
250
251 ::close(mEpollFd);
252 ::close(mINotifyFd);
253 ::close(mWakeReadPipeFd);
254 ::close(mWakeWritePipeFd);
255
256 release_wake_lock(WAKE_LOCK_ID);
257 }
258
259 InputDeviceIdentifier EventHub::getDeviceIdentifier(int32_t deviceId) const {
260 AutoMutex _l(mLock);
261 Device* device = getDeviceLocked(deviceId);
262 if (device == NULL) return InputDeviceIdentifier();
263 return device->identifier;
264 }
265
266 uint32_t EventHub::getDeviceClasses(int32_t deviceId) const {
267 AutoMutex _l(mLock);
268 Device* device = getDeviceLocked(deviceId);
269 if (device == NULL) return 0;
270 return device->classes;
271 }
272
273 void EventHub::getConfiguration(int32_t deviceId, PropertyMap* outConfiguration) const {
274 AutoMutex _l(mLock);
275 Device* device = getDeviceLocked(deviceId);
276 if (device && device->configuration) {
277 *outConfiguration = *device->configuration;
278 } else {
279 outConfiguration->clear();
280 }
281 }
282
283 status_t EventHub::getAbsoluteAxisInfo(int32_t deviceId, int axis,
284 RawAbsoluteAxisInfo* outAxisInfo) const {
285 outAxisInfo->clear();
286
287 if (axis >= 0 && axis <= ABS_MAX) {
288 AutoMutex _l(mLock);
289
290 Device* device = getDeviceLocked(deviceId);
291 if (device && !device->isVirtual() && test_bit(axis, device->absBitmask)) {
292 struct input_absinfo info;
293 if(ioctl(device->fd, EVIOCGABS(axis), &info)) {
294 ALOGW("Error reading absolute controller %d for device %s fd %d, errno=%d",
295 axis, device->identifier.name.string(), device->fd, errno);
296 return -errno;
297 }
298
299 if (info.minimum != info.maximum) {
300 outAxisInfo->valid = true;
301 outAxisInfo->minValue = info.minimum;
302 outAxisInfo->maxValue = info.maximum;
303 outAxisInfo->flat = info.flat;
304 outAxisInfo->fuzz = info.fuzz;
305 outAxisInfo->resolution = info.resolution;
306 }
307 return OK;
308 }
309 }
310 return -1;
311 }
312
313 bool EventHub::hasRelativeAxis(int32_t deviceId, int axis) const {
314 if (axis >= 0 && axis <= REL_MAX) {
315 AutoMutex _l(mLock);
316
317 Device* device = getDeviceLocked(deviceId);
318 if (device) {
319 return test_bit(axis, device->relBitmask);
320 }
321 }
322 return false;
323 }
324
325 bool EventHub::hasInputProperty(int32_t deviceId, int property) const {
326 if (property >= 0 && property <= INPUT_PROP_MAX) {
327 AutoMutex _l(mLock);
328
329 Device* device = getDeviceLocked(deviceId);
330 if (device) {
331 return test_bit(property, device->propBitmask);
332 }
333 }
334 return false;
335 }
336
337 int32_t EventHub::getScanCodeState(int32_t deviceId, int32_t scanCode) const {
338 if (scanCode >= 0 && scanCode <= KEY_MAX) {
339 AutoMutex _l(mLock);
340
341 Device* device = getDeviceLocked(deviceId);
342 if (device && !device->isVirtual() && test_bit(scanCode, device->keyBitmask)) {
343 uint8_t keyState[sizeof_bit_array(KEY_MAX + 1)];
344 memset(keyState, 0, sizeof(keyState));
345 if (ioctl(device->fd, EVIOCGKEY(sizeof(keyState)), keyState) >= 0) {
346 return test_bit(scanCode, keyState) ? AKEY_STATE_DOWN : AKEY_STATE_UP;
347 }
348 }
349 }
350 return AKEY_STATE_UNKNOWN;
351 }
352
353 int32_t EventHub::getKeyCodeState(int32_t deviceId, int32_t keyCode) const {
354 AutoMutex _l(mLock);
355
356 Device* device = getDeviceLocked(deviceId);
357 if (device && !device->isVirtual() && device->keyMap.haveKeyLayout()) {
358 Vector<int32_t> scanCodes;
359 device->keyMap.keyLayoutMap->findScanCodesForKey(keyCode, &scanCodes);
360 if (scanCodes.size() != 0) {
361 uint8_t keyState[sizeof_bit_array(KEY_MAX + 1)];
362 memset(keyState, 0, sizeof(keyState));
363 if (ioctl(device->fd, EVIOCGKEY(sizeof(keyState)), keyState) >= 0) {
364 for (size_t i = 0; i < scanCodes.size(); i++) {
365 int32_t sc = scanCodes.itemAt(i);
366 if (sc >= 0 && sc <= KEY_MAX && test_bit(sc, keyState)) {
367 return AKEY_STATE_DOWN;
368 }
369 }
370 return AKEY_STATE_UP;
371 }
372 }
373 }
374 return AKEY_STATE_UNKNOWN;
375 }
376
377 int32_t EventHub::getSwitchState(int32_t deviceId, int32_t sw) const {
378 if (sw >= 0 && sw <= SW_MAX) {
379 AutoMutex _l(mLock);
380
381 Device* device = getDeviceLocked(deviceId);
382 if (device && !device->isVirtual() && test_bit(sw, device->swBitmask)) {
383 uint8_t swState[sizeof_bit_array(SW_MAX + 1)];
384 memset(swState, 0, sizeof(swState));
385 if (ioctl(device->fd, EVIOCGSW(sizeof(swState)), swState) >= 0) {
386 return test_bit(sw, swState) ? AKEY_STATE_DOWN : AKEY_STATE_UP;
387 }
388 }
389 }
390 return AKEY_STATE_UNKNOWN;
391 }
392
393 status_t EventHub::getAbsoluteAxisValue(int32_t deviceId, int32_t axis, int32_t* outValue) const {
394 *outValue = 0;
395
396 if (axis >= 0 && axis <= ABS_MAX) {
397 AutoMutex _l(mLock);
398
399 Device* device = getDeviceLocked(deviceId);
400 if (device && !device->isVirtual() && test_bit(axis, device->absBitmask)) {
401 struct input_absinfo info;
402 if(ioctl(device->fd, EVIOCGABS(axis), &info)) {
403 ALOGW("Error reading absolute controller %d for device %s fd %d, errno=%d",
404 axis, device->identifier.name.string(), device->fd, errno);
405 return -errno;
406 }
407
408 *outValue = info.value;
409 return OK;
410 }
411 }
412 return -1;
413 }
414
415 bool EventHub::markSupportedKeyCodes(int32_t deviceId, size_t numCodes,
416 const int32_t* keyCodes, uint8_t* outFlags) const {
417 AutoMutex _l(mLock);
418
419 Device* device = getDeviceLocked(deviceId);
420 if (device && device->keyMap.haveKeyLayout()) {
421 Vector<int32_t> scanCodes;
422 for (size_t codeIndex = 0; codeIndex < numCodes; codeIndex++) {
423 scanCodes.clear();
424
425 status_t err = device->keyMap.keyLayoutMap->findScanCodesForKey(
426 keyCodes[codeIndex], &scanCodes);
427 if (! err) {
428 // check the possible scan codes identified by the layout map against the
429 // map of codes actually emitted by the driver
430 for (size_t sc = 0; sc < scanCodes.size(); sc++) {
431 if (test_bit(scanCodes[sc], device->keyBitmask)) {
432 outFlags[codeIndex] = 1;
433 break;
434 }
435 }
436 }
437 }
438 return true;
439 }
440 return false;
441 }
442
443 status_t EventHub::mapKey(int32_t deviceId, int32_t scanCode, int32_t usageCode,
444 int32_t* outKeycode, uint32_t* outFlags) const {
445 AutoMutex _l(mLock);
446 Device* device = getDeviceLocked(deviceId);
447
448 if (device) {
449 // Check the key character map first.
450 sp<KeyCharacterMap> kcm = device->getKeyCharacterMap();
451 if (kcm != NULL) {
452 if (!kcm->mapKey(scanCode, usageCode, outKeycode)) {
453 *outFlags = 0;
454 return NO_ERROR;
455 }
456 }
457
458 // Check the key layout next.
459 if (device->keyMap.haveKeyLayout()) {
460 if (!device->keyMap.keyLayoutMap->mapKey(
461 scanCode, usageCode, outKeycode, outFlags)) {
462 return NO_ERROR;
463 }
464 }
465 }
466
467 *outKeycode = 0;
468 *outFlags = 0;
469 return NAME_NOT_FOUND;
470 }
471
472 status_t EventHub::mapAxis(int32_t deviceId, int32_t scanCode, AxisInfo* outAxisInfo) const {
473 AutoMutex _l(mLock);
474 Device* device = getDeviceLocked(deviceId);
475
476 if (device && device->keyMap.haveKeyLayout()) {
477 status_t err = device->keyMap.keyLayoutMap->mapAxis(scanCode, outAxisInfo);
478 if (err == NO_ERROR) {
479 return NO_ERROR;
480 }
481 }
482
483 return NAME_NOT_FOUND;
484 }
485
486 void EventHub::setExcludedDevices(const Vector<String8>& devices) {
487 AutoMutex _l(mLock);
488
489 mExcludedDevices = devices;
490 }
491
492 bool EventHub::hasScanCode(int32_t deviceId, int32_t scanCode) const {
493 AutoMutex _l(mLock);
494 Device* device = getDeviceLocked(deviceId);
495 if (device && scanCode >= 0 && scanCode <= KEY_MAX) {
496 if (test_bit(scanCode, device->keyBitmask)) {
497 return true;
498 }
499 }
500 return false;
501 }
502
503 bool EventHub::hasLed(int32_t deviceId, int32_t led) const {
504 AutoMutex _l(mLock);
505 Device* device = getDeviceLocked(deviceId);
506 if (device && led >= 0 && led <= LED_MAX) {
507 if (test_bit(led, device->ledBitmask)) {
508 return true;
509 }
510 }
511 return false;
512 }
513
514 void EventHub::setLedState(int32_t deviceId, int32_t led, bool on) {
515 AutoMutex _l(mLock);
516 Device* device = getDeviceLocked(deviceId);
517 if (device && !device->isVirtual() && led >= 0 && led <= LED_MAX) {
518 struct input_event ev;
519 ev.time.tv_sec = 0;
520 ev.time.tv_usec = 0;
521 ev.type = EV_LED;
522 ev.code = led;
523 ev.value = on ? 1 : 0;
524
525 ssize_t nWrite;
526 do {
527 nWrite = write(device->fd, &ev, sizeof(struct input_event));
528 } while (nWrite == -1 && errno == EINTR);
529 }
530 }
531
532 void EventHub::getVirtualKeyDefinitions(int32_t deviceId,
533 Vector<VirtualKeyDefinition>& outVirtualKeys) const {
534 outVirtualKeys.clear();
535
536 AutoMutex _l(mLock);
537 Device* device = getDeviceLocked(deviceId);
538 if (device && device->virtualKeyMap) {
539 outVirtualKeys.appendVector(device->virtualKeyMap->getVirtualKeys());
540 }
541 }
542
543 sp<KeyCharacterMap> EventHub::getKeyCharacterMap(int32_t deviceId) const {
544 AutoMutex _l(mLock);
545 Device* device = getDeviceLocked(deviceId);
546 if (device) {
547 return device->getKeyCharacterMap();
548 }
549 return NULL;
550 }
551
552 bool EventHub::setKeyboardLayoutOverlay(int32_t deviceId,
553 const sp<KeyCharacterMap>& map) {
554 AutoMutex _l(mLock);
555 Device* device = getDeviceLocked(deviceId);
556 if (device) {
557 if (map != device->overlayKeyMap) {
558 device->overlayKeyMap = map;
559 device->combinedKeyMap = KeyCharacterMap::combine(
560 device->keyMap.keyCharacterMap, map);
561 return true;
562 }
563 }
564 return false;
565 }
566
567 void EventHub::vibrate(int32_t deviceId, nsecs_t duration) {
568 AutoMutex _l(mLock);
569 Device* device = getDeviceLocked(deviceId);
570 if (device && !device->isVirtual()) {
571 ff_effect effect;
572 memset(&effect, 0, sizeof(effect));
573 effect.type = FF_RUMBLE;
574 effect.id = device->ffEffectId;
575 effect.u.rumble.strong_magnitude = 0xc000;
576 effect.u.rumble.weak_magnitude = 0xc000;
577 effect.replay.length = (duration + 999999LL) / 1000000LL;
578 effect.replay.delay = 0;
579 if (ioctl(device->fd, EVIOCSFF, &effect)) {
580 ALOGW("Could not upload force feedback effect to device %s due to error %d.",
581 device->identifier.name.string(), errno);
582 return;
583 }
584 device->ffEffectId = effect.id;
585
586 struct input_event ev;
587 ev.time.tv_sec = 0;
588 ev.time.tv_usec = 0;
589 ev.type = EV_FF;
590 ev.code = device->ffEffectId;
591 ev.value = 1;
592 if (write(device->fd, &ev, sizeof(ev)) != sizeof(ev)) {
593 ALOGW("Could not start force feedback effect on device %s due to error %d.",
594 device->identifier.name.string(), errno);
595 return;
596 }
597 device->ffEffectPlaying = true;
598 }
599 }
600
601 void EventHub::cancelVibrate(int32_t deviceId) {
602 AutoMutex _l(mLock);
603 Device* device = getDeviceLocked(deviceId);
604 if (device && !device->isVirtual()) {
605 if (device->ffEffectPlaying) {
606 device->ffEffectPlaying = false;
607
608 struct input_event ev;
609 ev.time.tv_sec = 0;
610 ev.time.tv_usec = 0;
611 ev.type = EV_FF;
612 ev.code = device->ffEffectId;
613 ev.value = 0;
614 if (write(device->fd, &ev, sizeof(ev)) != sizeof(ev)) {
615 ALOGW("Could not stop force feedback effect on device %s due to error %d.",
616 device->identifier.name.string(), errno);
617 return;
618 }
619 }
620 }
621 }
622
623 EventHub::Device* EventHub::getDeviceLocked(int32_t deviceId) const {
624 if (deviceId == BUILT_IN_KEYBOARD_ID) {
625 deviceId = mBuiltInKeyboardId;
626 }
627 ssize_t index = mDevices.indexOfKey(deviceId);
628 return index >= 0 ? mDevices.valueAt(index) : NULL;
629 }
630
631 EventHub::Device* EventHub::getDeviceByPathLocked(const char* devicePath) const {
632 for (size_t i = 0; i < mDevices.size(); i++) {
633 Device* device = mDevices.valueAt(i);
634 if (device->path == devicePath) {
635 return device;
636 }
637 }
638 return NULL;
639 }
640
641 size_t EventHub::getEvents(int timeoutMillis, RawEvent* buffer, size_t bufferSize) {
642 ALOG_ASSERT(bufferSize >= 1);
643
644 AutoMutex _l(mLock);
645
646 struct input_event readBuffer[bufferSize];
647
648 RawEvent* event = buffer;
649 size_t capacity = bufferSize;
650 bool awoken = false;
651 for (;;) {
652 nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC);
653
654 // Reopen input devices if needed.
655 if (mNeedToReopenDevices) {
656 mNeedToReopenDevices = false;
657
658 ALOGI("Reopening all input devices due to a configuration change.");
659
660 closeAllDevicesLocked();
661 mNeedToScanDevices = true;
662 break; // return to the caller before we actually rescan
663 }
664
665 // Report any devices that had last been added/removed.
666 while (mClosingDevices) {
667 Device* device = mClosingDevices;
668 ALOGV("Reporting device closed: id=%d, name=%s\n",
669 device->id, device->path.string());
670 mClosingDevices = device->next;
671 event->when = now;
672 event->deviceId = device->id == mBuiltInKeyboardId ? BUILT_IN_KEYBOARD_ID : device->id;
673 event->type = DEVICE_REMOVED;
674 event += 1;
675 delete device;
676 mNeedToSendFinishedDeviceScan = true;
677 if (--capacity == 0) {
678 break;
679 }
680 }
681
682 if (mNeedToScanDevices) {
683 mNeedToScanDevices = false;
684 scanDevicesLocked();
685 mNeedToSendFinishedDeviceScan = true;
686 }
687
688 while (mOpeningDevices != NULL) {
689 Device* device = mOpeningDevices;
690 ALOGV("Reporting device opened: id=%d, name=%s\n",
691 device->id, device->path.string());
692 mOpeningDevices = device->next;
693 event->when = now;
694 event->deviceId = device->id == mBuiltInKeyboardId ? 0 : device->id;
695 event->type = DEVICE_ADDED;
696 event += 1;
697 mNeedToSendFinishedDeviceScan = true;
698 if (--capacity == 0) {
699 break;
700 }
701 }
702
703 if (mNeedToSendFinishedDeviceScan) {
704 mNeedToSendFinishedDeviceScan = false;
705 event->when = now;
706 event->type = FINISHED_DEVICE_SCAN;
707 event += 1;
708 if (--capacity == 0) {
709 break;
710 }
711 }
712
713 // Grab the next input event.
714 bool deviceChanged = false;
715 while (mPendingEventIndex < mPendingEventCount) {
716 const struct epoll_event& eventItem = mPendingEventItems[mPendingEventIndex++];
717 if (eventItem.data.u32 == EPOLL_ID_INOTIFY) {
718 if (eventItem.events & EPOLLIN) {
719 mPendingINotify = true;
720 } else {
721 ALOGW("Received unexpected epoll event 0x%08x for INotify.", eventItem.events);
722 }
723 continue;
724 }
725
726 if (eventItem.data.u32 == EPOLL_ID_WAKE) {
727 if (eventItem.events & EPOLLIN) {
728 ALOGV("awoken after wake()");
729 awoken = true;
730 char buffer[16];
731 ssize_t nRead;
732 do {
733 nRead = read(mWakeReadPipeFd, buffer, sizeof(buffer));
734 } while ((nRead == -1 && errno == EINTR) || nRead == sizeof(buffer));
735 } else {
736 ALOGW("Received unexpected epoll event 0x%08x for wake read pipe.",
737 eventItem.events);
738 }
739 continue;
740 }
741
742 ssize_t deviceIndex = mDevices.indexOfKey(eventItem.data.u32);
743 if (deviceIndex < 0) {
744 ALOGW("Received unexpected epoll event 0x%08x for unknown device id %d.",
745 eventItem.events, eventItem.data.u32);
746 continue;
747 }
748
749 Device* device = mDevices.valueAt(deviceIndex);
750 if (eventItem.events & EPOLLIN) {
751 int32_t readSize = read(device->fd, readBuffer,
752 sizeof(struct input_event) * capacity);
753 if (readSize == 0 || (readSize < 0 && errno == ENODEV)) {
754 // Device was removed before INotify noticed.
755 ALOGW("could not get event, removed? (fd: %d size: %d bufferSize: %d "
756 "capacity: %d errno: %d)\n",
757 device->fd, readSize, bufferSize, capacity, errno);
758 deviceChanged = true;
759 closeDeviceLocked(device);
760 } else if (readSize < 0) {
761 if (errno != EAGAIN && errno != EINTR) {
762 ALOGW("could not get event (errno=%d)", errno);
763 }
764 } else if ((readSize % sizeof(struct input_event)) != 0) {
765 ALOGE("could not get event (wrong size: %d)", readSize);
766 } else {
767 int32_t deviceId = device->id == mBuiltInKeyboardId ? 0 : device->id;
768
769 size_t count = size_t(readSize) / sizeof(struct input_event);
770 for (size_t i = 0; i < count; i++) {
771 struct input_event& iev = readBuffer[i];
772 ALOGV("%s got: time=%d.%06d, type=%d, code=%d, value=%d",
773 device->path.string(),
774 (int) iev.time.tv_sec, (int) iev.time.tv_usec,
775 iev.type, iev.code, iev.value);
776
777 // Some input devices may have a better concept of the time
778 // when an input event was actually generated than the kernel
779 // which simply timestamps all events on entry to evdev.
780 // This is a custom Android extension of the input protocol
781 // mainly intended for use with uinput based device drivers.
782 if (iev.type == EV_MSC) {
783 if (iev.code == MSC_ANDROID_TIME_SEC) {
784 device->timestampOverrideSec = iev.value;
785 continue;
786 } else if (iev.code == MSC_ANDROID_TIME_USEC) {
787 device->timestampOverrideUsec = iev.value;
788 continue;
789 }
790 }
791 if (device->timestampOverrideSec || device->timestampOverrideUsec) {
792 iev.time.tv_sec = device->timestampOverrideSec;
793 iev.time.tv_usec = device->timestampOverrideUsec;
794 if (iev.type == EV_SYN && iev.code == SYN_REPORT) {
795 device->timestampOverrideSec = 0;
796 device->timestampOverrideUsec = 0;
797 }
798 ALOGV("applied override time %d.%06d",
799 int(iev.time.tv_sec), int(iev.time.tv_usec));
800 }
801
802 #ifdef HAVE_POSIX_CLOCKS
803 // Use the time specified in the event instead of the current time
804 // so that downstream code can get more accurate estimates of
805 // event dispatch latency from the time the event is enqueued onto
806 // the evdev client buffer.
807 //
808 // The event's timestamp fortuitously uses the same monotonic clock
809 // time base as the rest of Android. The kernel event device driver
810 // (drivers/input/evdev.c) obtains timestamps using ktime_get_ts().
811 // The systemTime(SYSTEM_TIME_MONOTONIC) function we use everywhere
812 // calls clock_gettime(CLOCK_MONOTONIC) which is implemented as a
813 // system call that also queries ktime_get_ts().
814 event->when = nsecs_t(iev.time.tv_sec) * 1000000000LL
815 + nsecs_t(iev.time.tv_usec) * 1000LL;
816 ALOGV("event time %lld, now %lld", event->when, now);
817
818 // Bug 7291243: Add a guard in case the kernel generates timestamps
819 // that appear to be far into the future because they were generated
820 // using the wrong clock source.
821 //
822 // This can happen because when the input device is initially opened
823 // it has a default clock source of CLOCK_REALTIME. Any input events
824 // enqueued right after the device is opened will have timestamps
825 // generated using CLOCK_REALTIME. We later set the clock source
826 // to CLOCK_MONOTONIC but it is already too late.
827 //
828 // Invalid input event timestamps can result in ANRs, crashes and
829 // and other issues that are hard to track down. We must not let them
830 // propagate through the system.
831 //
832 // Log a warning so that we notice the problem and recover gracefully.
833 if (event->when >= now + 10 * 1000000000LL) {
834 // Double-check. Time may have moved on.
835 nsecs_t time = systemTime(SYSTEM_TIME_MONOTONIC);
836 if (event->when > time) {
837 ALOGW("An input event from %s has a timestamp that appears to "
838 "have been generated using the wrong clock source "
839 "(expected CLOCK_MONOTONIC): "
840 "event time %lld, current time %lld, call time %lld. "
841 "Using current time instead.",
842 device->path.string(), event->when, time, now);
843 event->when = time;
844 } else {
845 ALOGV("Event time is ok but failed the fast path and required "
846 "an extra call to systemTime: "
847 "event time %lld, current time %lld, call time %lld.",
848 event->when, time, now);
849 }
850 }
851 #else
852 event->when = now;
853 #endif
854 event->deviceId = deviceId;
855 event->type = iev.type;
856 event->code = iev.code;
857 event->value = iev.value;
858 event += 1;
859 capacity -= 1;
860 }
861 if (capacity == 0) {
862 // The result buffer is full. Reset the pending event index
863 // so we will try to read the device again on the next iteration.
864 mPendingEventIndex -= 1;
865 break;
866 }
867 }
868 } else if (eventItem.events & EPOLLHUP) {
869 ALOGI("Removing device %s due to epoll hang-up event.",
870 device->identifier.name.string());
871 deviceChanged = true;
872 closeDeviceLocked(device);
873 } else {
874 ALOGW("Received unexpected epoll event 0x%08x for device %s.",
875 eventItem.events, device->identifier.name.string());
876 }
877 }
878
879 // readNotify() will modify the list of devices so this must be done after
880 // processing all other events to ensure that we read all remaining events
881 // before closing the devices.
882 if (mPendingINotify && mPendingEventIndex >= mPendingEventCount) {
883 mPendingINotify = false;
884 readNotifyLocked();
885 deviceChanged = true;
886 }
887
888 // Report added or removed devices immediately.
889 if (deviceChanged) {
890 continue;
891 }
892
893 // Return now if we have collected any events or if we were explicitly awoken.
894 if (event != buffer || awoken) {
895 break;
896 }
897
898 // Poll for events. Mind the wake lock dance!
899 // We hold a wake lock at all times except during epoll_wait(). This works due to some
900 // subtle choreography. When a device driver has pending (unread) events, it acquires
901 // a kernel wake lock. However, once the last pending event has been read, the device
902 // driver will release the kernel wake lock. To prevent the system from going to sleep
903 // when this happens, the EventHub holds onto its own user wake lock while the client
904 // is processing events. Thus the system can only sleep if there are no events
905 // pending or currently being processed.
906 //
907 // The timeout is advisory only. If the device is asleep, it will not wake just to
908 // service the timeout.
909 mPendingEventIndex = 0;
910
911 mLock.unlock(); // release lock before poll, must be before release_wake_lock
912 release_wake_lock(WAKE_LOCK_ID);
913
914 int pollResult = epoll_wait(mEpollFd, mPendingEventItems, EPOLL_MAX_EVENTS, timeoutMillis);
915
916 acquire_wake_lock(PARTIAL_WAKE_LOCK, WAKE_LOCK_ID);
917 mLock.lock(); // reacquire lock after poll, must be after acquire_wake_lock
918
919 if (pollResult == 0) {
920 // Timed out.
921 mPendingEventCount = 0;
922 break;
923 }
924
925 if (pollResult < 0) {
926 // An error occurred.
927 mPendingEventCount = 0;
928
929 // Sleep after errors to avoid locking up the system.
930 // Hopefully the error is transient.
931 if (errno != EINTR) {
932 ALOGW("poll failed (errno=%d)\n", errno);
933 usleep(100000);
934 }
935 } else {
936 // Some events occurred.
937 mPendingEventCount = size_t(pollResult);
938 }
939 }
940
941 // All done, return the number of events we read.
942 return event - buffer;
943 }
944
945 void EventHub::wake() {
946 ALOGV("wake() called");
947
948 ssize_t nWrite;
949 do {
950 nWrite = write(mWakeWritePipeFd, "W", 1);
951 } while (nWrite == -1 && errno == EINTR);
952
953 if (nWrite != 1 && errno != EAGAIN) {
954 ALOGW("Could not write wake signal, errno=%d", errno);
955 }
956 }
957
958 void EventHub::scanDevicesLocked() {
959 status_t res = scanDirLocked(DEVICE_PATH);
960 if(res < 0) {
961 ALOGE("scan dir failed for %s\n", DEVICE_PATH);
962 }
963 if (mDevices.indexOfKey(VIRTUAL_KEYBOARD_ID) < 0) {
964 createVirtualKeyboardLocked();
965 }
966 }
967
968 // ----------------------------------------------------------------------------
969
970 static bool containsNonZeroByte(const uint8_t* array, uint32_t startIndex, uint32_t endIndex) {
971 const uint8_t* end = array + endIndex;
972 array += startIndex;
973 while (array != end) {
974 if (*(array++) != 0) {
975 return true;
976 }
977 }
978 return false;
979 }
980
981 static const int32_t GAMEPAD_KEYCODES[] = {
982 AKEYCODE_BUTTON_A, AKEYCODE_BUTTON_B, AKEYCODE_BUTTON_C,
983 AKEYCODE_BUTTON_X, AKEYCODE_BUTTON_Y, AKEYCODE_BUTTON_Z,
984 AKEYCODE_BUTTON_L1, AKEYCODE_BUTTON_R1,
985 AKEYCODE_BUTTON_L2, AKEYCODE_BUTTON_R2,
986 AKEYCODE_BUTTON_THUMBL, AKEYCODE_BUTTON_THUMBR,
987 AKEYCODE_BUTTON_START, AKEYCODE_BUTTON_SELECT, AKEYCODE_BUTTON_MODE,
988 AKEYCODE_BUTTON_1, AKEYCODE_BUTTON_2, AKEYCODE_BUTTON_3, AKEYCODE_BUTTON_4,
989 AKEYCODE_BUTTON_5, AKEYCODE_BUTTON_6, AKEYCODE_BUTTON_7, AKEYCODE_BUTTON_8,
990 AKEYCODE_BUTTON_9, AKEYCODE_BUTTON_10, AKEYCODE_BUTTON_11, AKEYCODE_BUTTON_12,
991 AKEYCODE_BUTTON_13, AKEYCODE_BUTTON_14, AKEYCODE_BUTTON_15, AKEYCODE_BUTTON_16,
992 };
993
994 status_t EventHub::openDeviceLocked(const char *devicePath) {
995 char buffer[80];
996
997 ALOGV("Opening device: %s", devicePath);
998
999 int fd = open(devicePath, O_RDWR | O_CLOEXEC);
1000 if(fd < 0) {
1001 ALOGE("could not open %s, %s\n", devicePath, strerror(errno));
1002 return -1;
1003 }
1004
1005 InputDeviceIdentifier identifier;
1006
1007 // Get device name.
1008 if(ioctl(fd, EVIOCGNAME(sizeof(buffer) - 1), &buffer) < 1) {
1009 //fprintf(stderr, "could not get device name for %s, %s\n", devicePath, strerror(errno));
1010 } else {
1011 buffer[sizeof(buffer) - 1] = '\0';
1012 identifier.name.setTo(buffer);
1013 }
1014
1015 // Check to see if the device is on our excluded list
1016 for (size_t i = 0; i < mExcludedDevices.size(); i++) {
1017 const String8& item = mExcludedDevices.itemAt(i);
1018 if (identifier.name == item) {
1019 ALOGI("ignoring event id %s driver %s\n", devicePath, item.string());
1020 close(fd);
1021 return -1;
1022 }
1023 }
1024
1025 // Get device driver version.
1026 int driverVersion;
1027 if(ioctl(fd, EVIOCGVERSION, &driverVersion)) {
1028 ALOGE("could not get driver version for %s, %s\n", devicePath, strerror(errno));
1029 close(fd);
1030 return -1;
1031 }
1032
1033 // Get device identifier.
1034 struct input_id inputId;
1035 if(ioctl(fd, EVIOCGID, &inputId)) {
1036 ALOGE("could not get device input id for %s, %s\n", devicePath, strerror(errno));
1037 close(fd);
1038 return -1;
1039 }
1040 identifier.bus = inputId.bustype;
1041 identifier.product = inputId.product;
1042 identifier.vendor = inputId.vendor;
1043 identifier.version = inputId.version;
1044
1045 // Get device physical location.
1046 if(ioctl(fd, EVIOCGPHYS(sizeof(buffer) - 1), &buffer) < 1) {
1047 //fprintf(stderr, "could not get location for %s, %s\n", devicePath, strerror(errno));
1048 } else {
1049 buffer[sizeof(buffer) - 1] = '\0';
1050 identifier.location.setTo(buffer);
1051 }
1052
1053 // Get device unique id.
1054 if(ioctl(fd, EVIOCGUNIQ(sizeof(buffer) - 1), &buffer) < 1) {
1055 //fprintf(stderr, "could not get idstring for %s, %s\n", devicePath, strerror(errno));
1056 } else {
1057 buffer[sizeof(buffer) - 1] = '\0';
1058 identifier.uniqueId.setTo(buffer);
1059 }
1060
1061 // Fill in the descriptor.
1062 setDescriptor(identifier);
1063
1064 // Make file descriptor non-blocking for use with poll().
1065 if (fcntl(fd, F_SETFL, O_NONBLOCK)) {
1066 ALOGE("Error %d making device file descriptor non-blocking.", errno);
1067 close(fd);
1068 return -1;
1069 }
1070
1071 // Allocate device. (The device object takes ownership of the fd at this point.)
1072 int32_t deviceId = mNextDeviceId++;
1073 Device* device = new Device(fd, deviceId, String8(devicePath), identifier);
1074
1075 ALOGV("add device %d: %s\n", deviceId, devicePath);
1076 ALOGV(" bus: %04x\n"
1077 " vendor %04x\n"
1078 " product %04x\n"
1079 " version %04x\n",
1080 identifier.bus, identifier.vendor, identifier.product, identifier.version);
1081 ALOGV(" name: \"%s\"\n", identifier.name.string());
1082 ALOGV(" location: \"%s\"\n", identifier.location.string());
1083 ALOGV(" unique id: \"%s\"\n", identifier.uniqueId.string());
1084 ALOGV(" descriptor: \"%s\"\n", identifier.descriptor.string());
1085 ALOGV(" driver: v%d.%d.%d\n",
1086 driverVersion >> 16, (driverVersion >> 8) & 0xff, driverVersion & 0xff);
1087
1088 // Load the configuration file for the device.
1089 loadConfigurationLocked(device);
1090
1091 // Figure out the kinds of events the device reports.
1092 ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(device->keyBitmask)), device->keyBitmask);
1093 ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(device->absBitmask)), device->absBitmask);
1094 ioctl(fd, EVIOCGBIT(EV_REL, sizeof(device->relBitmask)), device->relBitmask);
1095 ioctl(fd, EVIOCGBIT(EV_SW, sizeof(device->swBitmask)), device->swBitmask);
1096 ioctl(fd, EVIOCGBIT(EV_LED, sizeof(device->ledBitmask)), device->ledBitmask);
1097 ioctl(fd, EVIOCGBIT(EV_FF, sizeof(device->ffBitmask)), device->ffBitmask);
1098 ioctl(fd, EVIOCGPROP(sizeof(device->propBitmask)), device->propBitmask);
1099
1100 // See if this is a keyboard. Ignore everything in the button range except for
1101 // joystick and gamepad buttons which are handled like keyboards for the most part.
1102 bool haveKeyboardKeys = containsNonZeroByte(device->keyBitmask, 0, sizeof_bit_array(BTN_MISC))
1103 || containsNonZeroByte(device->keyBitmask, sizeof_bit_array(KEY_OK),
1104 sizeof_bit_array(KEY_MAX + 1));
1105 bool haveGamepadButtons = containsNonZeroByte(device->keyBitmask, sizeof_bit_array(BTN_MISC),
1106 sizeof_bit_array(BTN_MOUSE))
1107 || containsNonZeroByte(device->keyBitmask, sizeof_bit_array(BTN_JOYSTICK),
1108 sizeof_bit_array(BTN_DIGI));
1109 if (haveKeyboardKeys || haveGamepadButtons) {
1110 device->classes |= INPUT_DEVICE_CLASS_KEYBOARD;
1111 }
1112
1113 // See if this is a cursor device such as a trackball or mouse.
1114 if (test_bit(BTN_MOUSE, device->keyBitmask)
1115 && test_bit(REL_X, device->relBitmask)
1116 && test_bit(REL_Y, device->relBitmask)) {
1117 device->classes |= INPUT_DEVICE_CLASS_CURSOR;
1118 }
1119
1120 // See if this is a touch pad.
1121 // Is this a new modern multi-touch driver?
1122 if (test_bit(ABS_MT_POSITION_X, device->absBitmask)
1123 && test_bit(ABS_MT_POSITION_Y, device->absBitmask)) {
1124 // Some joysticks such as the PS3 controller report axes that conflict
1125 // with the ABS_MT range. Try to confirm that the device really is
1126 // a touch screen.
1127 if (test_bit(BTN_TOUCH, device->keyBitmask) || !haveGamepadButtons) {
1128 device->classes |= INPUT_DEVICE_CLASS_TOUCH | INPUT_DEVICE_CLASS_TOUCH_MT;
1129 }
1130 // Is this an old style single-touch driver?
1131 } else if (test_bit(BTN_TOUCH, device->keyBitmask)
1132 && test_bit(ABS_X, device->absBitmask)
1133 && test_bit(ABS_Y, device->absBitmask)) {
1134 device->classes |= INPUT_DEVICE_CLASS_TOUCH;
1135 }
1136
1137 // See if this device is a joystick.
1138 // Assumes that joysticks always have gamepad buttons in order to distinguish them
1139 // from other devices such as accelerometers that also have absolute axes.
1140 if (haveGamepadButtons) {
1141 uint32_t assumedClasses = device->classes | INPUT_DEVICE_CLASS_JOYSTICK;
1142 for (int i = 0; i <= ABS_MAX; i++) {
1143 if (test_bit(i, device->absBitmask)
1144 && (getAbsAxisUsage(i, assumedClasses) & INPUT_DEVICE_CLASS_JOYSTICK)) {
1145 device->classes = assumedClasses;
1146 break;
1147 }
1148 }
1149 }
1150
1151 // Check whether this device has switches.
1152 for (int i = 0; i <= SW_MAX; i++) {
1153 if (test_bit(i, device->swBitmask)) {
1154 device->classes |= INPUT_DEVICE_CLASS_SWITCH;
1155 break;
1156 }
1157 }
1158
1159 // Check whether this device supports the vibrator.
1160 if (test_bit(FF_RUMBLE, device->ffBitmask)) {
1161 device->classes |= INPUT_DEVICE_CLASS_VIBRATOR;
1162 }
1163
1164 // Configure virtual keys.
1165 if ((device->classes & INPUT_DEVICE_CLASS_TOUCH)) {
1166 // Load the virtual keys for the touch screen, if any.
1167 // We do this now so that we can make sure to load the keymap if necessary.
1168 status_t status = loadVirtualKeyMapLocked(device);
1169 if (!status) {
1170 device->classes |= INPUT_DEVICE_CLASS_KEYBOARD;
1171 }
1172 }
1173
1174 // Load the key map.
1175 // We need to do this for joysticks too because the key layout may specify axes.
1176 status_t keyMapStatus = NAME_NOT_FOUND;
1177 if (device->classes & (INPUT_DEVICE_CLASS_KEYBOARD | INPUT_DEVICE_CLASS_JOYSTICK)) {
1178 // Load the keymap for the device.
1179 keyMapStatus = loadKeyMapLocked(device);
1180 }
1181
1182 // Configure the keyboard, gamepad or virtual keyboard.
1183 if (device->classes & INPUT_DEVICE_CLASS_KEYBOARD) {
1184 // Register the keyboard as a built-in keyboard if it is eligible.
1185 if (!keyMapStatus
1186 && mBuiltInKeyboardId == NO_BUILT_IN_KEYBOARD
1187 && isEligibleBuiltInKeyboard(device->identifier,
1188 device->configuration, &device->keyMap)) {
1189 mBuiltInKeyboardId = device->id;
1190 }
1191
1192 // 'Q' key support = cheap test of whether this is an alpha-capable kbd
1193 if (hasKeycodeLocked(device, AKEYCODE_Q)) {
1194 device->classes |= INPUT_DEVICE_CLASS_ALPHAKEY;
1195 }
1196
1197 // See if this device has a DPAD.
1198 if (hasKeycodeLocked(device, AKEYCODE_DPAD_UP) &&
1199 hasKeycodeLocked(device, AKEYCODE_DPAD_DOWN) &&
1200 hasKeycodeLocked(device, AKEYCODE_DPAD_LEFT) &&
1201 hasKeycodeLocked(device, AKEYCODE_DPAD_RIGHT) &&
1202 hasKeycodeLocked(device, AKEYCODE_DPAD_CENTER)) {
1203 device->classes |= INPUT_DEVICE_CLASS_DPAD;
1204 }
1205
1206 // See if this device has a gamepad.
1207 for (size_t i = 0; i < sizeof(GAMEPAD_KEYCODES)/sizeof(GAMEPAD_KEYCODES[0]); i++) {
1208 if (hasKeycodeLocked(device, GAMEPAD_KEYCODES[i])) {
1209 device->classes |= INPUT_DEVICE_CLASS_GAMEPAD;
1210 break;
1211 }
1212 }
1213
1214 // Disable kernel key repeat since we handle it ourselves
1215 unsigned int repeatRate[] = {0,0};
1216 if (ioctl(fd, EVIOCSREP, repeatRate)) {
1217 ALOGW("Unable to disable kernel key repeat for %s: %s", devicePath, strerror(errno));
1218 }
1219 }
1220
1221 // If the device isn't recognized as something we handle, don't monitor it.
1222 if (device->classes == 0) {
1223 ALOGV("Dropping device: id=%d, path='%s', name='%s'",
1224 deviceId, devicePath, device->identifier.name.string());
1225 delete device;
1226 return -1;
1227 }
1228
1229 // Determine whether the device is external or internal.
1230 if (isExternalDeviceLocked(device)) {
1231 device->classes |= INPUT_DEVICE_CLASS_EXTERNAL;
1232 }
1233
1234 // Register with epoll.
1235 struct epoll_event eventItem;
1236 memset(&eventItem, 0, sizeof(eventItem));
1237 eventItem.events = EPOLLIN;
1238 eventItem.data.u32 = deviceId;
1239 if (epoll_ctl(mEpollFd, EPOLL_CTL_ADD, fd, &eventItem)) {
1240 ALOGE("Could not add device fd to epoll instance. errno=%d", errno);
1241 delete device;
1242 return -1;
1243 }
1244
1245 // Enable wake-lock behavior on kernels that support it.
1246 // TODO: Only need this for devices that can really wake the system.
1247 bool usingSuspendBlockIoctl = !ioctl(fd, EVIOCSSUSPENDBLOCK, 1);
1248
1249 // Tell the kernel that we want to use the monotonic clock for reporting timestamps
1250 // associated with input events. This is important because the input system
1251 // uses the timestamps extensively and assumes they were recorded using the monotonic
1252 // clock.
1253 //
1254 // In older kernel, before Linux 3.4, there was no way to tell the kernel which
1255 // clock to use to input event timestamps. The standard kernel behavior was to
1256 // record a real time timestamp, which isn't what we want. Android kernels therefore
1257 // contained a patch to the evdev_event() function in drivers/input/evdev.c to
1258 // replace the call to do_gettimeofday() with ktime_get_ts() to cause the monotonic
1259 // clock to be used instead of the real time clock.
1260 //
1261 // As of Linux 3.4, there is a new EVIOCSCLOCKID ioctl to set the desired clock.
1262 // Therefore, we no longer require the Android-specific kernel patch described above
1263 // as long as we make sure to set select the monotonic clock. We do that here.
1264 int clockId = CLOCK_MONOTONIC;
1265 bool usingClockIoctl = !ioctl(fd, EVIOCSCLOCKID, &clockId);
1266
1267 ALOGI("New device: id=%d, fd=%d, path='%s', name='%s', classes=0x%x, "
1268 "configuration='%s', keyLayout='%s', keyCharacterMap='%s', builtinKeyboard=%s, "
1269 "usingSuspendBlockIoctl=%s, usingClockIoctl=%s",
1270 deviceId, fd, devicePath, device->identifier.name.string(),
1271 device->classes,
1272 device->configurationFile.string(),
1273 device->keyMap.keyLayoutFile.string(),
1274 device->keyMap.keyCharacterMapFile.string(),
1275 toString(mBuiltInKeyboardId == deviceId),
1276 toString(usingSuspendBlockIoctl), toString(usingClockIoctl));
1277
1278 addDeviceLocked(device);
1279 return 0;
1280 }
1281
1282 void EventHub::createVirtualKeyboardLocked() {
1283 InputDeviceIdentifier identifier;
1284 identifier.name = "Virtual";
1285 identifier.uniqueId = "<virtual>";
1286 setDescriptor(identifier);
1287
1288 Device* device = new Device(-1, VIRTUAL_KEYBOARD_ID, String8("<virtual>"), identifier);
1289 device->classes = INPUT_DEVICE_CLASS_KEYBOARD
1290 | INPUT_DEVICE_CLASS_ALPHAKEY
1291 | INPUT_DEVICE_CLASS_DPAD
1292 | INPUT_DEVICE_CLASS_VIRTUAL;
1293 loadKeyMapLocked(device);
1294 addDeviceLocked(device);
1295 }
1296
1297 void EventHub::addDeviceLocked(Device* device) {
1298 mDevices.add(device->id, device);
1299 device->next = mOpeningDevices;
1300 mOpeningDevices = device;
1301 }
1302
1303 void EventHub::loadConfigurationLocked(Device* device) {
1304 device->configurationFile = getInputDeviceConfigurationFilePathByDeviceIdentifier(
1305 device->identifier, INPUT_DEVICE_CONFIGURATION_FILE_TYPE_CONFIGURATION);
1306 if (device->configurationFile.isEmpty()) {
1307 ALOGD("No input device configuration file found for device '%s'.",
1308 device->identifier.name.string());
1309 } else {
1310 status_t status = PropertyMap::load(device->configurationFile,
1311 &device->configuration);
1312 if (status) {
1313 ALOGE("Error loading input device configuration file for device '%s'. "
1314 "Using default configuration.",
1315 device->identifier.name.string());
1316 }
1317 }
1318 }
1319
1320 status_t EventHub::loadVirtualKeyMapLocked(Device* device) {
1321 // The virtual key map is supplied by the kernel as a system board property file.
1322 String8 path;
1323 path.append("/sys/board_properties/virtualkeys.");
1324 path.append(device->identifier.name);
1325 if (access(path.string(), R_OK)) {
1326 return NAME_NOT_FOUND;
1327 }
1328 return VirtualKeyMap::load(path, &device->virtualKeyMap);
1329 }
1330
1331 status_t EventHub::loadKeyMapLocked(Device* device) {
1332 return device->keyMap.load(device->identifier, device->configuration);
1333 }
1334
1335 bool EventHub::isExternalDeviceLocked(Device* device) {
1336 if (device->configuration) {
1337 bool value;
1338 if (device->configuration->tryGetProperty(String8("device.internal"), value)) {
1339 return !value;
1340 }
1341 }
1342 return device->identifier.bus == BUS_USB || device->identifier.bus == BUS_BLUETOOTH;
1343 }
1344
1345 bool EventHub::hasKeycodeLocked(Device* device, int keycode) const {
1346 if (!device->keyMap.haveKeyLayout() || !device->keyBitmask) {
1347 return false;
1348 }
1349
1350 Vector<int32_t> scanCodes;
1351 device->keyMap.keyLayoutMap->findScanCodesForKey(keycode, &scanCodes);
1352 const size_t N = scanCodes.size();
1353 for (size_t i=0; i<N && i<=KEY_MAX; i++) {
1354 int32_t sc = scanCodes.itemAt(i);
1355 if (sc >= 0 && sc <= KEY_MAX && test_bit(sc, device->keyBitmask)) {
1356 return true;
1357 }
1358 }
1359
1360 return false;
1361 }
1362
1363 status_t EventHub::closeDeviceByPathLocked(const char *devicePath) {
1364 Device* device = getDeviceByPathLocked(devicePath);
1365 if (device) {
1366 closeDeviceLocked(device);
1367 return 0;
1368 }
1369 ALOGV("Remove device: %s not found, device may already have been removed.", devicePath);
1370 return -1;
1371 }
1372
1373 void EventHub::closeAllDevicesLocked() {
1374 while (mDevices.size() > 0) {
1375 closeDeviceLocked(mDevices.valueAt(mDevices.size() - 1));
1376 }
1377 }
1378
1379 void EventHub::closeDeviceLocked(Device* device) {
1380 ALOGI("Removed device: path=%s name=%s id=%d fd=%d classes=0x%x\n",
1381 device->path.string(), device->identifier.name.string(), device->id,
1382 device->fd, device->classes);
1383
1384 if (device->id == mBuiltInKeyboardId) {
1385 ALOGW("built-in keyboard device %s (id=%d) is closing! the apps will not like this",
1386 device->path.string(), mBuiltInKeyboardId);
1387 mBuiltInKeyboardId = NO_BUILT_IN_KEYBOARD;
1388 }
1389
1390 if (!device->isVirtual()) {
1391 if (epoll_ctl(mEpollFd, EPOLL_CTL_DEL, device->fd, NULL)) {
1392 ALOGW("Could not remove device fd from epoll instance. errno=%d", errno);
1393 }
1394 }
1395
1396 mDevices.removeItem(device->id);
1397 device->close();
1398
1399 // Unlink for opening devices list if it is present.
1400 Device* pred = NULL;
1401 bool found = false;
1402 for (Device* entry = mOpeningDevices; entry != NULL; ) {
1403 if (entry == device) {
1404 found = true;
1405 break;
1406 }
1407 pred = entry;
1408 entry = entry->next;
1409 }
1410 if (found) {
1411 // Unlink the device from the opening devices list then delete it.
1412 // We don't need to tell the client that the device was closed because
1413 // it does not even know it was opened in the first place.
1414 ALOGI("Device %s was immediately closed after opening.", device->path.string());
1415 if (pred) {
1416 pred->next = device->next;
1417 } else {
1418 mOpeningDevices = device->next;
1419 }
1420 delete device;
1421 } else {
1422 // Link into closing devices list.
1423 // The device will be deleted later after we have informed the client.
1424 device->next = mClosingDevices;
1425 mClosingDevices = device;
1426 }
1427 }
1428
1429 status_t EventHub::readNotifyLocked() {
1430 int res;
1431 char devname[PATH_MAX];
1432 char *filename;
1433 char event_buf[512];
1434 int event_size;
1435 int event_pos = 0;
1436 struct inotify_event *event;
1437
1438 ALOGV("EventHub::readNotify nfd: %d\n", mINotifyFd);
1439 res = read(mINotifyFd, event_buf, sizeof(event_buf));
1440 if(res < (int)sizeof(*event)) {
1441 if(errno == EINTR)
1442 return 0;
1443 ALOGW("could not get event, %s\n", strerror(errno));
1444 return -1;
1445 }
1446 //printf("got %d bytes of event information\n", res);
1447
1448 strcpy(devname, DEVICE_PATH);
1449 filename = devname + strlen(devname);
1450 *filename++ = '/';
1451
1452 while(res >= (int)sizeof(*event)) {
1453 event = (struct inotify_event *)(event_buf + event_pos);
1454 //printf("%d: %08x \"%s\"\n", event->wd, event->mask, event->len ? event->name : "");
1455 if(event->len) {
1456 strcpy(filename, event->name);
1457 if(event->mask & IN_CREATE) {
1458 openDeviceLocked(devname);
1459 } else {
1460 ALOGI("Removing device '%s' due to inotify event\n", devname);
1461 closeDeviceByPathLocked(devname);
1462 }
1463 }
1464 event_size = sizeof(*event) + event->len;
1465 res -= event_size;
1466 event_pos += event_size;
1467 }
1468 return 0;
1469 }
1470
1471 status_t EventHub::scanDirLocked(const char *dirname)
1472 {
1473 char devname[PATH_MAX];
1474 char *filename;
1475 DIR *dir;
1476 struct dirent *de;
1477 dir = opendir(dirname);
1478 if(dir == NULL)
1479 return -1;
1480 strcpy(devname, dirname);
1481 filename = devname + strlen(devname);
1482 *filename++ = '/';
1483 while((de = readdir(dir))) {
1484 if(de->d_name[0] == '.' &&
1485 (de->d_name[1] == '\0' ||
1486 (de->d_name[1] == '.' && de->d_name[2] == '\0')))
1487 continue;
1488 strcpy(filename, de->d_name);
1489 openDeviceLocked(devname);
1490 }
1491 closedir(dir);
1492 return 0;
1493 }
1494
1495 void EventHub::requestReopenDevices() {
1496 ALOGV("requestReopenDevices() called");
1497
1498 AutoMutex _l(mLock);
1499 mNeedToReopenDevices = true;
1500 }
1501
1502 void EventHub::dump(String8& dump) {
1503 dump.append("Event Hub State:\n");
1504
1505 { // acquire lock
1506 AutoMutex _l(mLock);
1507
1508 dump.appendFormat(INDENT "BuiltInKeyboardId: %d\n", mBuiltInKeyboardId);
1509
1510 dump.append(INDENT "Devices:\n");
1511
1512 for (size_t i = 0; i < mDevices.size(); i++) {
1513 const Device* device = mDevices.valueAt(i);
1514 if (mBuiltInKeyboardId == device->id) {
1515 dump.appendFormat(INDENT2 "%d: %s (aka device 0 - built-in keyboard)\n",
1516 device->id, device->identifier.name.string());
1517 } else {
1518 dump.appendFormat(INDENT2 "%d: %s\n", device->id,
1519 device->identifier.name.string());
1520 }
1521 dump.appendFormat(INDENT3 "Classes: 0x%08x\n", device->classes);
1522 dump.appendFormat(INDENT3 "Path: %s\n", device->path.string());
1523 dump.appendFormat(INDENT3 "Descriptor: %s\n", device->identifier.descriptor.string());
1524 dump.appendFormat(INDENT3 "Location: %s\n", device->identifier.location.string());
1525 dump.appendFormat(INDENT3 "UniqueId: %s\n", device->identifier.uniqueId.string());
1526 dump.appendFormat(INDENT3 "Identifier: bus=0x%04x, vendor=0x%04x, "
1527 "product=0x%04x, version=0x%04x\n",
1528 device->identifier.bus, device->identifier.vendor,
1529 device->identifier.product, device->identifier.version);
1530 dump.appendFormat(INDENT3 "KeyLayoutFile: %s\n",
1531 device->keyMap.keyLayoutFile.string());
1532 dump.appendFormat(INDENT3 "KeyCharacterMapFile: %s\n",
1533 device->keyMap.keyCharacterMapFile.string());
1534 dump.appendFormat(INDENT3 "ConfigurationFile: %s\n",
1535 device->configurationFile.string());
1536 dump.appendFormat(INDENT3 "HaveKeyboardLayoutOverlay: %s\n",
1537 toString(device->overlayKeyMap != NULL));
1538 }
1539 } // release lock
1540 }
1541
1542 void EventHub::monitor() {
1543 // Acquire and release the lock to ensure that the event hub has not deadlocked.
1544 mLock.lock();
1545 mLock.unlock();
1546 }
1547
1548
1549 }; // namespace android

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