现在我们otg连接设备的时候有点亮屏幕的需求。
解决方法我们可以在识别设备的时候，去调用PowerManager的wakeup唤醒(点亮）设备。
void InputReader::processEventsLocked(const RawEvent* rawEvents, size_t count) {for (const RawEvent* rawEvent = rawEvents; count;) {int32_t type = rawEvent->type;size_t batchSize = 1;if (type < EventHubInterface::FIRST_SYNTHETIC_EVENT) {int32_t deviceId = rawEvent->deviceId;while (batchSize < count) {if (rawEvent[batchSize].type >= EventHubInterface::FIRST_SYNTHETIC_EVENT|| rawEvent[batchSize].deviceId != deviceId) {break;}batchSize += 1;}processEventsForDeviceLocked(deviceId, rawEvent, batchSize);} else {switch (rawEvent->type) {case EventHubInterface::DEVICE_ADDED:addDeviceLocked(rawEvent->when, rawEvent->deviceId);//识别设备后添加设备到链表保存break;case EventHubInterface::DEVICE_REMOVED:removeDeviceLocked(rawEvent->when, rawEvent->deviceId);break;case EventHubInterface::FINISHED_DEVICE_SCAN:handleConfigurationChangedLocked(rawEvent->when);break;default:ALOG_ASSERT(false); // can't happenbreak;}}count -= batchSize;rawEvent += batchSize;}}
所以我们可以在addDeviceLocked中唤醒设备
void InputReader::addDeviceLocked(nsecs_t when, int32_t deviceId) {ssize_t deviceIndex = mDevices.indexOfKey(deviceId);if (deviceIndex >= 0) {ALOGW("Ignoring spurious device added event for deviceId %d.", deviceId);return;}InputDeviceIdentifier identifier = mEventHub->getDeviceIdentifier(deviceId);uint32_t classes = mEventHub->getDeviceClasses(deviceId);int32_t controllerNumber = mEventHub->getDeviceControllerNumber(deviceId);InputDevice* device = createDeviceLocked(deviceId, controllerNumber, identifier, classes);device->configure(when, &mConfig, 0);device->reset(when);if (device->isIgnored()) {ALOGI("Device added: id=%d, name='%s' (ignored non-input device)", deviceId,identifier.name.string());} else {ALOGI("Device added: id=%d, name='%s', sources=0x%08x", deviceId,identifier.name.string(), device->getSources());}//when add the device to notify wakeup device.mPolicy->notifyWakeUpDevice(when);//这里是我们添加的用来唤醒设备mDevices.add(deviceId, device);bumpGenerationLocked();if (device->getClasses() & INPUT_DEVICE_CLASS_EXTERNAL_STYLUS) {notifyExternalStylusPresenceChanged();}}
上面mPolicy实际上是NativeInputManager，所以调用了NativeInputManager的notifyWakeUpDevice，这个函数是我们自己添加的
//notify PhoneWindowManager to wakeup the device.void NativeInputManager::notifyWakeUpDevice(nsecs_t when) {uint32_t policyFlags = 0;policyFlags |= POLICY_FLAG_TRUSTED;policyFlags |= POLICY_FLAG_WAKE;JNIEnv* env = jniEnv();jint wmActions = env->CallIntMethod(mServiceObj,//调用了PhoneWindowManager的interceptMotionBeforeQueueingNonInteractivegServiceClassInfo.interceptMotionBeforeQueueingNonInteractive,when, policyFlags);checkAndClearExceptionFromCallback(env,"interceptMotionBeforeQueueingNonInteractive");}
这个函数主要调用了PhoneWindowManager的interceptMotionBeforeQueueingNonInteractive函数，本来这个函数是在notfifyMotion中调用的，是有Motion事件，比如鼠标按键事件，用来唤醒(点亮）设备的我们来看下这个函数。
@Overridepublic int interceptMotionBeforeQueueingNonInteractive(long whenNanos, int policyFlags) {if ((policyFlags & FLAG_WAKE) != 0) {if (wakeUp(whenNanos / 1000000, mAllowTheaterModeWakeFromMotion,"android.policy:MOTION")) {return 0;}}if (shouldDispatchInputWhenNonInteractive()) {return ACTION_PASS_TO_USER;}// If we have not passed the action up and we are in theater mode without dreaming,// there will be no dream to intercept the touch and wake into ambient. The device should// wake up in this case.if (isTheaterModeEnabled() && (policyFlags & FLAG_WAKE) != 0) {wakeUp(whenNanos / 1000000, mAllowTheaterModeWakeFromMotionWhenNotDreaming,"android.policy:MOTION");}return 0;}
这个函数主要调用了wakeup来唤醒设备，这个wakeup最终会调用PowerManager的wakeup函数。
因此我们现在借用了原先有motion事件，用来点亮屏幕的函数。在识别设备的时候，调用这个函数也点亮屏幕。
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