Acquire and Release Wake Lock (f2aca3b4) · Commits · e / os / android_hardware_interfaces

sensors/2.0/default/Android.bp

+1 −0

Original line number	Diff line number	Diff line
		@@ -32,6 +32,7 @@ cc_binary {
		"libhidlbase",
		"libhidltransport",
		"liblog",
		"libpower",
		"libutils",
		],
		}

sensors/2.0/default/Sensor.cpp

+7 −3

Original line number	Diff line number	Diff line
		@@ -86,7 +86,7 @@ Result Sensor::flush() {
		ev.sensorType = SensorType::ADDITIONAL_INFO;
		ev.u.meta.what = MetaDataEventType::META_DATA_FLUSH_COMPLETE;
		std::vector<Event> evs{ev};
		mCallback->postEvents(evs);
		mCallback->postEvents(evs, isWakeUpSensor());

		return Result::OK;
		}
		@@ -113,7 +113,7 @@ void Sensor::run() {
		if (now >= nextSampleTime) {
		mLastSampleTimeNs = now;
		nextSampleTime = mLastSampleTimeNs + mSamplingPeriodNs;
		mCallback->postEvents(readEvents());
		mCallback->postEvents(readEvents(), isWakeUpSensor());
		}

		mWaitCV.wait_for(runLock, std::chrono::nanoseconds(nextSampleTime - now));
		@@ -121,6 +121,10 @@ void Sensor::run() {
		}
		}

		bool Sensor::isWakeUpSensor() {
		return mSensorInfo.flags & static_cast<uint32_t>(SensorFlagBits::WAKE_UP);
		}

		std::vector<Event> Sensor::readEvents() {
		std::vector<Event> events;
		Event event;
		@@ -155,7 +159,7 @@ Result Sensor::injectEvent(const Event& event) {
		} else if (!supportsDataInjection()) {
		result = Result::INVALID_OPERATION;
		} else if (mMode == OperationMode::DATA_INJECTION) {
		mCallback->postEvents(std::vector<Event>{event});
		mCallback->postEvents(std::vector<Event>{event}, isWakeUpSensor());
		} else {
		result = Result::BAD_VALUE;
		}

sensors/2.0/default/Sensor.h

+3 −1

Original line number	Diff line number	Diff line
		@@ -40,7 +40,7 @@ namespace implementation {
		class ISensorsEventCallback {
		public:
		virtual ~ISensorsEventCallback(){};
		virtual void postEvents(const std::vector<Event>& events) = 0;
		virtual void postEvents(const std::vector<Event>& events, bool wakeup) = 0;
		};

		class Sensor {
		@@ -62,6 +62,8 @@ class Sensor {
		virtual std::vector<Event> readEvents();
		static void startThread(Sensor* sensor);

		bool isWakeUpSensor();

		bool mIsEnabled;
		int64_t mSamplingPeriodNs;
		int64_t mLastSampleTimeNs;

sensors/2.0/default/Sensors.cpp

+74 −8

Original line number	Diff line number	Diff line
		@@ -30,8 +30,16 @@ using ::android::hardware::sensors::V1_0::OperationMode;
		using ::android::hardware::sensors::V1_0::RateLevel;
		using ::android::hardware::sensors::V1_0::Result;
		using ::android::hardware::sensors::V1_0::SharedMemInfo;
		using ::android::hardware::sensors::V2_0::SensorTimeout;

		Sensors::Sensors() : mEventQueueFlag(nullptr) {
		constexpr const char* kWakeLockName = "SensorsHAL_WAKEUP";

		Sensors::Sensors()
		: mEventQueueFlag(nullptr),
		mOutstandingWakeUpEvents(0),
		mReadWakeLockQueueRun(false),
		mAutoReleaseWakeLockTime(0),
		mHasWakeLock(false) {
		std::shared_ptr<AccelSensor> accel =
		std::make_shared<AccelSensor>(1 /* sensorHandle /, this / callback */);
		mSensors[accel->getSensorInfo().sensorHandle] = accel;
		@@ -39,6 +47,8 @@ Sensors::Sensors() : mEventQueueFlag(nullptr) {

		Sensors::~Sensors() {
		deleteEventFlag();
		mReadWakeLockQueueRun = false;
		mWakeLockThread.join();
		}

		// Methods from ::android::hardware::sensors::V2_0::ISensors follow.
		@@ -101,6 +111,10 @@ Return<Result> Sensors::initialize(
		result = Result::BAD_VALUE;
		}

		// Start the thread to read events from the Wake Lock FMQ
		mReadWakeLockQueueRun = true;
		mWakeLockThread = std::thread(startReadWakeLockThread, this);

		return result;
		}

		@@ -147,15 +161,67 @@ Return<void> Sensors::configDirectReport(int32_t /* sensorHandle /, int32_t /
		return Return<void>();
		}

		void Sensors::postEvents(const std::vector<Event>& events) {
		std::lock_guard<std::mutex> l(mLock);
		void Sensors::postEvents(const std::vector<Event>& events, bool wakeup) {
		std::lock_guard<std::mutex> lock(mWriteLock);
		if (mEventQueue->write(events.data(), events.size())) {
		mEventQueueFlag->wake(static_cast<uint32_t>(EventQueueFlagBits::READ_AND_PROCESS));

		// TODO: read events from the Wake Lock FMQ in the right place
		std::vector<uint32_t> tmp(mWakeLockQueue->availableToRead());
		mWakeLockQueue->read(tmp.data(), mWakeLockQueue->availableToRead());
		if (wakeup) {
		// Keep track of the number of outstanding WAKE_UP events in order to properly hold
		// a wake lock until the framework has secured a wake lock
		updateWakeLock(events.size(), 0 /* eventsHandled */);
		}
		}
		}

		mEventQueue->write(events.data(), events.size());
		mEventQueueFlag->wake(static_cast<uint32_t>(EventQueueFlagBits::READ_AND_PROCESS));
		void Sensors::updateWakeLock(int32_t eventsWritten, int32_t eventsHandled) {
		std::lock_guard<std::mutex> lock(mWakeLockLock);
		int32_t newVal = mOutstandingWakeUpEvents + eventsWritten - eventsHandled;
		if (newVal < 0) {
		mOutstandingWakeUpEvents = 0;
		} else {
		mOutstandingWakeUpEvents = newVal;
		}

		if (eventsWritten > 0) {
		// Update the time at which the last WAKE_UP event was sent
		mAutoReleaseWakeLockTime = ::android::uptimeMillis() +
		static_cast<uint32_t>(SensorTimeout::WAKE_LOCK_SECONDS) * 1000;
		}

		if (!mHasWakeLock && mOutstandingWakeUpEvents > 0 &&
		acquire_wake_lock(PARTIAL_WAKE_LOCK, kWakeLockName) == 0) {
		mHasWakeLock = true;
		} else if (mHasWakeLock) {
		// Check if the wake lock should be released automatically if
		// SensorTimeout::WAKE_LOCK_SECONDS has elapsed since the last WAKE_UP event was written to
		// the Wake Lock FMQ.
		if (::android::uptimeMillis() > mAutoReleaseWakeLockTime) {
		ALOGD("No events read from wake lock FMQ for %d seconds, auto releasing wake lock",
		SensorTimeout::WAKE_LOCK_SECONDS);
		mOutstandingWakeUpEvents = 0;
		}

		if (mOutstandingWakeUpEvents == 0 && release_wake_lock(kWakeLockName) == 0) {
		mHasWakeLock = false;
		}
		}
		}

		void Sensors::readWakeLockFMQ() {
		while (mReadWakeLockQueueRun.load()) {
		constexpr int64_t kReadTimeoutNs = 500 * 1000 * 1000; // 500 ms
		uint32_t eventsHandled = 0;

		// Read events from the Wake Lock FMQ. Timeout after a reasonable amount of time to ensure
		// that any held wake lock is able to be released if it is held for too long.
		mWakeLockQueue->readBlocking(&eventsHandled, 1 /* count */, kReadTimeoutNs);
		updateWakeLock(0 /* eventsWritten */, eventsHandled);
		}
		}

		void Sensors::startReadWakeLockThread(Sensors* sensors) {
		sensors->readWakeLockFMQ();
		}

		void Sensors::deleteEventFlag() {

sensors/2.0/default/Sensors.h

+48 −3

Original line number	Diff line number	Diff line
		@@ -21,10 +21,13 @@

		#include <android/hardware/sensors/2.0/ISensors.h>
		#include <fmq/MessageQueue.h>
		#include <hardware_legacy/power.h>
		#include <hidl/MQDescriptor.h>
		#include <hidl/Status.h>

		#include <atomic>
		#include <memory>
		#include <thread>

		namespace android {
		namespace hardware {
		@@ -80,7 +83,7 @@ struct Sensors : public ISensors, public ISensorsEventCallback {
		Return<void> configDirectReport(int32_t sensorHandle, int32_t channelHandle, RateLevel rate,
		configDirectReport_cb _hidl_cb) override;

		void postEvents(const std::vector<Event>& events) override;
		void postEvents(const std::vector<Event>& events, bool wakeup) override;

		private:
		/**
		@@ -88,6 +91,18 @@ struct Sensors : public ISensors, public ISensorsEventCallback {
		*/
		void deleteEventFlag();

		/**
		* Function to read the Wake Lock FMQ and release the wake lock when appropriate
		*/
		void readWakeLockFMQ();

		static void startReadWakeLockThread(Sensors* sensors);

		/**
		* Responsible for acquiring and releasing a wake lock when there are unhandled WAKE_UP events
		*/
		void updateWakeLock(int32_t eventsWritten, int32_t eventsHandled);

		using EventMessageQueue = MessageQueue<Event, kSynchronizedReadWrite>;
		using WakeLockMessageQueue = MessageQueue<uint32_t, kSynchronizedReadWrite>;

		@@ -117,9 +132,39 @@ struct Sensors : public ISensors, public ISensorsEventCallback {
		std::map<int32_t, std::shared_ptr<Sensor>> mSensors;

		/**
		* Lock to protect writes and reads to the FMQs
		* Lock to protect writes to the FMQs
		*/
		std::mutex mWriteLock;

		/**
		* Lock to protect acquiring and releasing the wake lock
		*/
		std::mutex mWakeLockLock;

		/**
		* Track the number of WAKE_UP events that have not been handled by the framework
		*/
		uint32_t mOutstandingWakeUpEvents;

		/**
		* A thread to read the Wake Lock FMQ
		*/
		std::thread mWakeLockThread;

		/**
		* Flag to indicate that the Wake Lock Thread should continue to run
		*/
		std::atomic_bool mReadWakeLockQueueRun;

		/**
		* Track the time when the wake lock should automatically be released
		*/
		int64_t mAutoReleaseWakeLockTime;

		/**
		* Flag to indicate if a wake lock has been acquired
		*/
		std::mutex mLock;
		bool mHasWakeLock;
		};

		} // namespace implementation