SensorEventQueue.cpp revision 7b5be95cb3903087742f1079fe89cddd8abe3696
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#define LOG_TAG "Sensors" 18 19#include <stdint.h> 20#include <sys/types.h> 21 22#include <utils/Errors.h> 23#include <utils/RefBase.h> 24#include <utils/Looper.h> 25 26#include <gui/Sensor.h> 27#include <gui/BitTube.h> 28#include <gui/SensorEventQueue.h> 29#include <gui/ISensorEventConnection.h> 30 31#include <android/sensor.h> 32 33// ---------------------------------------------------------------------------- 34namespace android { 35// ---------------------------------------------------------------------------- 36 37SensorEventQueue::SensorEventQueue(const sp<ISensorEventConnection>& connection) 38 : mSensorEventConnection(connection) 39{ 40} 41 42SensorEventQueue::~SensorEventQueue() 43{ 44} 45 46void SensorEventQueue::onFirstRef() 47{ 48 mSensorChannel = mSensorEventConnection->getSensorChannel(); 49} 50 51int SensorEventQueue::getFd() const 52{ 53 return mSensorChannel->getFd(); 54} 55 56 57ssize_t SensorEventQueue::write(const sp<BitTube>& tube, 58 ASensorEvent const* events, size_t numEvents) { 59 return BitTube::sendObjects(tube, events, numEvents); 60} 61 62ssize_t SensorEventQueue::read(ASensorEvent* events, size_t numEvents) 63{ 64 return BitTube::recvObjects(mSensorChannel, events, numEvents); 65} 66 67sp<Looper> SensorEventQueue::getLooper() const 68{ 69 Mutex::Autolock _l(mLock); 70 if (mLooper == 0) { 71 mLooper = new Looper(true); 72 mLooper->addFd(getFd(), getFd(), ALOOPER_EVENT_INPUT, NULL, NULL); 73 } 74 return mLooper; 75} 76 77status_t SensorEventQueue::waitForEvent() const 78{ 79 const int fd = getFd(); 80 sp<Looper> looper(getLooper()); 81 82 int32_t result; 83 do { 84 result = looper->pollOnce(-1); 85 if (result == ALOOPER_EVENT_ERROR) { 86 ALOGE("SensorEventQueue::waitForEvent error (errno=%d)", errno); 87 result = -EPIPE; // unknown error, so we make up one 88 break; 89 } 90 } while (result != fd); 91 92 return (result == fd) ? status_t(NO_ERROR) : result; 93} 94 95status_t SensorEventQueue::wake() const 96{ 97 sp<Looper> looper(getLooper()); 98 looper->wake(); 99 return NO_ERROR; 100} 101 102status_t SensorEventQueue::enableSensor(Sensor const* sensor) const { 103 return mSensorEventConnection->enableDisable(sensor->getHandle(), true); 104} 105 106status_t SensorEventQueue::disableSensor(Sensor const* sensor) const { 107 return mSensorEventConnection->enableDisable(sensor->getHandle(), false); 108} 109 110status_t SensorEventQueue::enableSensor(int32_t handle, int32_t us) const { 111 status_t err = mSensorEventConnection->enableDisable(handle, true); 112 if (err == NO_ERROR) { 113 mSensorEventConnection->setEventRate(handle, us2ns(us)); 114 } 115 return err; 116} 117 118status_t SensorEventQueue::disableSensor(int32_t handle) const { 119 return mSensorEventConnection->enableDisable(handle, false); 120} 121 122status_t SensorEventQueue::setEventRate(Sensor const* sensor, nsecs_t ns) const { 123 return mSensorEventConnection->setEventRate(sensor->getHandle(), ns); 124} 125 126// ---------------------------------------------------------------------------- 127}; // namespace android 128 129