| /* |
| * Copyright (C) 2010 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. |
| */ |
| |
| #ifndef ANDROID_SENSOR_SERVICE_H |
| #define ANDROID_SENSOR_SERVICE_H |
| |
| #include <stdint.h> |
| #include <sys/types.h> |
| |
| #include <utils/Vector.h> |
| #include <utils/SortedVector.h> |
| #include <utils/KeyedVector.h> |
| #include <utils/threads.h> |
| #include <utils/AndroidThreads.h> |
| #include <utils/RefBase.h> |
| #include <utils/Looper.h> |
| |
| #include <binder/BinderService.h> |
| |
| #include <gui/Sensor.h> |
| #include <gui/BitTube.h> |
| #include <gui/ISensorServer.h> |
| #include <gui/ISensorEventConnection.h> |
| |
| #include "SensorInterface.h" |
| |
| // --------------------------------------------------------------------------- |
| |
| #define DEBUG_CONNECTIONS false |
| // Max size is 100 KB which is enough to accept a batch of about 1000 events. |
| #define MAX_SOCKET_BUFFER_SIZE_BATCHED 100 * 1024 |
| // For older HALs which don't support batching, use a smaller socket buffer size. |
| #define SOCKET_BUFFER_SIZE_NON_BATCHED 4 * 1024 |
| |
| struct sensors_poll_device_t; |
| struct sensors_module_t; |
| |
| namespace android { |
| // --------------------------------------------------------------------------- |
| |
| class SensorService : |
| public BinderService<SensorService>, |
| public BnSensorServer, |
| protected Thread |
| { |
| friend class BinderService<SensorService>; |
| |
| static const char* WAKE_LOCK_NAME; |
| |
| static char const* getServiceName() ANDROID_API { return "sensorservice"; } |
| SensorService() ANDROID_API; |
| virtual ~SensorService(); |
| |
| virtual void onFirstRef(); |
| |
| // Thread interface |
| virtual bool threadLoop(); |
| |
| // ISensorServer interface |
| virtual Vector<Sensor> getSensorList(); |
| virtual sp<ISensorEventConnection> createSensorEventConnection(); |
| virtual status_t dump(int fd, const Vector<String16>& args); |
| |
| class SensorEventConnection : public BnSensorEventConnection, public LooperCallback { |
| friend class SensorService; |
| virtual ~SensorEventConnection(); |
| virtual void onFirstRef(); |
| virtual sp<BitTube> getSensorChannel() const; |
| virtual status_t enableDisable(int handle, bool enabled, nsecs_t samplingPeriodNs, |
| nsecs_t maxBatchReportLatencyNs, int reservedFlags); |
| virtual status_t setEventRate(int handle, nsecs_t samplingPeriodNs); |
| virtual status_t flush(); |
| // Count the number of flush complete events which are about to be dropped in the buffer. |
| // Increment mPendingFlushEventsToSend in mSensorInfo. These flush complete events will be |
| // sent separately before the next batch of events. |
| void countFlushCompleteEventsLocked(sensors_event_t const* scratch, int numEventsDropped); |
| |
| // Check if there are any wake up events in the buffer. If yes, return the index of the |
| // first wake_up sensor event in the buffer else return -1. This wake_up sensor event will |
| // have the flag WAKE_UP_SENSOR_EVENT_NEEDS_ACK set. Exactly one event per packet will have |
| // the wake_up flag set. SOCK_SEQPACKET ensures that either the entire packet is read or |
| // dropped. |
| int findWakeUpSensorEventLocked(sensors_event_t const* scratch, int count); |
| |
| // Send pending flush_complete events. There may have been flush_complete_events that are |
| // dropped which need to be sent separately before other events. On older HALs (1_0) this |
| // method emulates the behavior of flush(). |
| void sendPendingFlushEventsLocked(); |
| |
| // Writes events from mEventCache to the socket. |
| void writeToSocketFromCacheLocked(); |
| |
| // Compute the approximate cache size from the FIFO sizes of various sensors registered for |
| // this connection. Wake up and non-wake up sensors have separate FIFOs but FIFO may be |
| // shared amongst wake-up sensors and non-wake up sensors. |
| int computeMaxCacheSizeLocked() const; |
| |
| // When more sensors register, the maximum cache size desired may change. Compute max cache |
| // size, reallocate memory and copy over events from the older cache. |
| void reAllocateCacheLocked(sensors_event_t const* scratch, int count); |
| |
| // LooperCallback method. If there is data to read on this fd, it is an ack from the |
| // app that it has read events from a wake up sensor, decrement mWakeLockRefCount. |
| // If this fd is available for writing send the data from the cache. |
| virtual int handleEvent(int fd, int events, void* data); |
| |
| // Increment mPendingFlushEventsToSend for the given sensor handle. |
| void incrementPendingFlushCount(int32_t handle); |
| |
| // Add or remove the file descriptor associated with the BitTube to the looper. If mDead is |
| // set to true or there are no more sensors for this connection, the file descriptor is |
| // removed if it has been previously added to the Looper. Depending on the state of the |
| // connection FD may be added to the Looper. The flags to set are determined by the internal |
| // state of the connection. FDs are added to the looper when wake-up sensors are registered |
| // (to poll for acknowledgements) and when write fails on the socket when there are too many |
| // events (to poll when the FD is available for writing). FDs are removed when there is an |
| // error and the other end hangs up or when this client unregisters for this connection. |
| void updateLooperRegistration(const sp<Looper>& looper); |
| void updateLooperRegistrationLocked(const sp<Looper>& looper); |
| |
| sp<SensorService> const mService; |
| sp<BitTube> mChannel; |
| uid_t mUid; |
| mutable Mutex mConnectionLock; |
| // Number of events from wake up sensors which are still pending and haven't been delivered |
| // to the corresponding application. It is incremented by one unit for each write to the |
| // socket. |
| uint32_t mWakeLockRefCount; |
| |
| // If this flag is set to true, it means that the file descriptor associated with the |
| // BitTube has been added to the Looper in SensorService. This flag is typically set when |
| // this connection has wake-up sensors associated with it or when write has failed on this |
| // connection and we're storing some events in the cache. |
| bool mHasLooperCallbacks; |
| // If there are any errors associated with the Looper this flag is set to true and |
| // mWakeLockRefCount is reset to zero. needsWakeLock method will always return false, if |
| // this flag is set. |
| bool mDead; |
| struct FlushInfo { |
| // The number of flush complete events dropped for this sensor is stored here. |
| // They are sent separately before the next batch of events. |
| int mPendingFlushEventsToSend; |
| // Every activate is preceded by a flush. Only after the first flush complete is |
| // received, the events for the sensor are sent on that *connection*. |
| bool mFirstFlushPending; |
| FlushInfo() : mPendingFlushEventsToSend(0), mFirstFlushPending(false) {} |
| }; |
| // protected by SensorService::mLock. Key for this vector is the sensor handle. |
| KeyedVector<int, FlushInfo> mSensorInfo; |
| sensors_event_t *mEventCache; |
| int mCacheSize, mMaxCacheSize; |
| |
| #if DEBUG_CONNECTIONS |
| int mEventsReceived, mEventsSent, mEventsSentFromCache; |
| int mTotalAcksNeeded, mTotalAcksReceived; |
| #endif |
| |
| public: |
| SensorEventConnection(const sp<SensorService>& service, uid_t uid); |
| |
| status_t sendEvents(sensors_event_t const* buffer, size_t count, |
| sensors_event_t* scratch, |
| SensorEventConnection const * const * mapFlushEventsToConnections = NULL); |
| bool hasSensor(int32_t handle) const; |
| bool hasAnySensor() const; |
| bool hasOneShotSensors() const; |
| bool addSensor(int32_t handle); |
| bool removeSensor(int32_t handle); |
| void setFirstFlushPending(int32_t handle, bool value); |
| void dump(String8& result); |
| bool needsWakeLock(); |
| |
| uid_t getUid() const { return mUid; } |
| }; |
| |
| class SensorRecord { |
| SortedVector< wp<SensorEventConnection> > mConnections; |
| // A queue of all flush() calls made on this sensor. Flush complete events will be |
| // sent in this order. |
| Vector< wp<SensorEventConnection> > mPendingFlushConnections; |
| public: |
| SensorRecord(const sp<SensorEventConnection>& connection); |
| bool addConnection(const sp<SensorEventConnection>& connection); |
| bool removeConnection(const wp<SensorEventConnection>& connection); |
| size_t getNumConnections() const { return mConnections.size(); } |
| |
| void addPendingFlushConnection(const sp<SensorEventConnection>& connection); |
| void removeFirstPendingFlushConnection(); |
| SensorEventConnection * getFirstPendingFlushConnection(); |
| }; |
| |
| class SensorEventAckReceiver : public Thread { |
| sp<SensorService> const mService; |
| public: |
| virtual bool threadLoop(); |
| SensorEventAckReceiver(const sp<SensorService>& service): mService(service) {} |
| }; |
| |
| String8 getSensorName(int handle) const; |
| bool isVirtualSensor(int handle) const; |
| Sensor getSensorFromHandle(int handle) const; |
| bool isWakeUpSensor(int type) const; |
| void recordLastValueLocked(sensors_event_t const* buffer, size_t count); |
| static void sortEventBuffer(sensors_event_t* buffer, size_t count); |
| Sensor registerSensor(SensorInterface* sensor); |
| Sensor registerVirtualSensor(SensorInterface* sensor); |
| status_t cleanupWithoutDisable( |
| const sp<SensorEventConnection>& connection, int handle); |
| status_t cleanupWithoutDisableLocked( |
| const sp<SensorEventConnection>& connection, int handle); |
| void cleanupAutoDisabledSensorLocked(const sp<SensorEventConnection>& connection, |
| sensors_event_t const* buffer, const int count); |
| static bool canAccessSensor(const Sensor& sensor); |
| static bool verifyCanAccessSensor(const Sensor& sensor, const char* operation); |
| // SensorService acquires a partial wakelock for delivering events from wake up sensors. This |
| // method checks whether all the events from these wake up sensors have been delivered to the |
| // corresponding applications, if yes the wakelock is released. |
| void checkWakeLockState(); |
| void checkWakeLockStateLocked(); |
| bool isWakeUpSensorEvent(const sensors_event_t& event) const; |
| |
| SensorRecord * getSensorRecord(int handle); |
| |
| sp<Looper> getLooper() const; |
| |
| // constants |
| Vector<Sensor> mSensorList; |
| Vector<Sensor> mUserSensorListDebug; |
| Vector<Sensor> mUserSensorList; |
| DefaultKeyedVector<int, SensorInterface*> mSensorMap; |
| Vector<SensorInterface *> mVirtualSensorList; |
| status_t mInitCheck; |
| // Socket buffersize used to initialize BitTube. This size depends on whether batching is |
| // supported or not. |
| uint32_t mSocketBufferSize; |
| sp<Looper> mLooper; |
| |
| // protected by mLock |
| mutable Mutex mLock; |
| DefaultKeyedVector<int, SensorRecord*> mActiveSensors; |
| DefaultKeyedVector<int, SensorInterface*> mActiveVirtualSensors; |
| SortedVector< wp<SensorEventConnection> > mActiveConnections; |
| bool mWakeLockAcquired; |
| sensors_event_t *mSensorEventBuffer, *mSensorEventScratch; |
| SensorEventConnection const **mMapFlushEventsToConnections; |
| |
| // The size of this vector is constant, only the items are mutable |
| KeyedVector<int32_t, sensors_event_t> mLastEventSeen; |
| |
| public: |
| void cleanupConnection(SensorEventConnection* connection); |
| status_t enable(const sp<SensorEventConnection>& connection, int handle, |
| nsecs_t samplingPeriodNs, nsecs_t maxBatchReportLatencyNs, int reservedFlags); |
| status_t disable(const sp<SensorEventConnection>& connection, int handle); |
| status_t setEventRate(const sp<SensorEventConnection>& connection, int handle, nsecs_t ns); |
| status_t flushSensor(const sp<SensorEventConnection>& connection); |
| }; |
| |
| // --------------------------------------------------------------------------- |
| }; // namespace android |
| |
| #endif // ANDROID_SENSOR_SERVICE_H |