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      1 /*
      2  * Copyright (C) 2010 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 #ifndef ANDROID_SENSOR_EVENT_QUEUE_H
     18 #define ANDROID_SENSOR_EVENT_QUEUE_H
     19 
     20 #include <stdint.h>
     21 #include <sys/types.h>
     22 
     23 #include <utils/Errors.h>
     24 #include <utils/RefBase.h>
     25 #include <utils/Timers.h>
     26 
     27 #include <gui/BitTube.h>
     28 
     29 // ----------------------------------------------------------------------------
     30 #define WAKE_UP_SENSOR_EVENT_NEEDS_ACK (1U << 31)
     31 struct ALooper;
     32 struct ASensorEvent;
     33 
     34 // Concrete types for the NDK
     35 struct ASensorEventQueue {
     36     ALooper* looper;
     37 };
     38 
     39 // ----------------------------------------------------------------------------
     40 namespace android {
     41 // ----------------------------------------------------------------------------
     42 
     43 class ISensorEventConnection;
     44 class Sensor;
     45 class Looper;
     46 
     47 // ----------------------------------------------------------------------------
     48 
     49 class SensorEventQueue : public ASensorEventQueue, public RefBase
     50 {
     51 public:
     52 
     53     enum { MAX_RECEIVE_BUFFER_EVENT_COUNT = 256 };
     54 
     55             SensorEventQueue(const sp<ISensorEventConnection>& connection);
     56     virtual ~SensorEventQueue();
     57     virtual void onFirstRef();
     58 
     59     int getFd() const;
     60 
     61     static ssize_t write(const sp<BitTube>& tube,
     62             ASensorEvent const* events, size_t numEvents);
     63 
     64     ssize_t read(ASensorEvent* events, size_t numEvents);
     65 
     66     status_t waitForEvent() const;
     67     status_t wake() const;
     68 
     69     status_t enableSensor(Sensor const* sensor) const;
     70     status_t disableSensor(Sensor const* sensor) const;
     71     status_t setEventRate(Sensor const* sensor, nsecs_t ns) const;
     72 
     73     // these are here only to support SensorManager.java
     74     status_t enableSensor(int32_t handle, int32_t samplingPeriodUs, int maxBatchReportLatencyUs,
     75                           int reservedFlags) const;
     76     status_t disableSensor(int32_t handle) const;
     77     status_t flush() const;
     78     // Send an ack for every wake_up sensor event that is set to WAKE_UP_SENSOR_EVENT_NEEDS_ACK.
     79     void sendAck(const ASensorEvent* events, int count);
     80 private:
     81     sp<Looper> getLooper() const;
     82     sp<ISensorEventConnection> mSensorEventConnection;
     83     sp<BitTube> mSensorChannel;
     84     mutable Mutex mLock;
     85     mutable sp<Looper> mLooper;
     86     ASensorEvent* mRecBuffer;
     87     size_t mAvailable;
     88     size_t mConsumed;
     89     uint32_t mNumAcksToSend;
     90 };
     91 
     92 // ----------------------------------------------------------------------------
     93 }; // namespace android
     94 
     95 #endif // ANDROID_SENSOR_EVENT_QUEUE_H
     96