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 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 79 private: 80 sp<Looper> getLooper() const; 81 sp<ISensorEventConnection> mSensorEventConnection; 82 sp<BitTube> mSensorChannel; 83 mutable Mutex mLock; 84 mutable sp<Looper> mLooper; 85 ASensorEvent* mRecBuffer; 86 size_t mAvailable; 87 size_t mConsumed; 88 }; 89 90 // ---------------------------------------------------------------------------- 91 }; // namespace android 92 93 #endif // ANDROID_SENSOR_EVENT_QUEUE_H 94