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 #pragma once 18 19 #include <stdint.h> 20 #include <sys/types.h> 21 22 #include <utils/Errors.h> 23 #include <utils/RefBase.h> 24 #include <utils/Timers.h> 25 #include <utils/Mutex.h> 26 27 #include <sensor/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 /** 56 * Typical sensor delay (sample period) in microseconds. 57 */ 58 // Fastest sampling, system will bound it to minDelay 59 static constexpr int32_t SENSOR_DELAY_FASTEST = 0; 60 // Typical sample period for game, 50Hz; 61 static constexpr int32_t SENSOR_DELAY_GAME = 20000; 62 // Typical sample period for UI, 15Hz 63 static constexpr int32_t SENSOR_DELAY_UI = 66667; 64 // Default sensor sample period 65 static constexpr int32_t SENSOR_DELAY_NORMAL = 200000; 66 67 SensorEventQueue(const sp<ISensorEventConnection>& connection); 68 virtual ~SensorEventQueue(); 69 virtual void onFirstRef(); 70 71 int getFd() const; 72 73 static ssize_t write(const sp<BitTube>& tube, 74 ASensorEvent const* events, size_t numEvents); 75 76 ssize_t read(ASensorEvent* events, size_t numEvents); 77 78 status_t waitForEvent() const; 79 status_t wake() const; 80 81 status_t enableSensor(Sensor const* sensor) const; 82 status_t enableSensor(Sensor const* sensor, int32_t samplingPeriodUs) const; 83 status_t disableSensor(Sensor const* sensor) const; 84 status_t setEventRate(Sensor const* sensor, nsecs_t ns) const; 85 86 // these are here only to support SensorManager.java and HIDL Frameworks SensorManager. 87 status_t enableSensor(int32_t handle, int32_t samplingPeriodUs, int64_t maxBatchReportLatencyUs, 88 int reservedFlags) const; 89 status_t disableSensor(int32_t handle) const; 90 status_t flush() const; 91 // Send an ack for every wake_up sensor event that is set to WAKE_UP_SENSOR_EVENT_NEEDS_ACK. 92 void sendAck(const ASensorEvent* events, int count); 93 94 status_t injectSensorEvent(const ASensorEvent& event); 95 private: 96 sp<Looper> getLooper() const; 97 sp<ISensorEventConnection> mSensorEventConnection; 98 sp<BitTube> mSensorChannel; 99 mutable Mutex mLock; 100 mutable sp<Looper> mLooper; 101 ASensorEvent* mRecBuffer; 102 size_t mAvailable; 103 size_t mConsumed; 104 uint32_t mNumAcksToSend; 105 }; 106 107 // ---------------------------------------------------------------------------- 108 }; // namespace android 109
