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 <sensor/SensorEventQueue.h> 20 21 #include <algorithm> 22 #include <sys/socket.h> 23 24 #include <utils/RefBase.h> 25 #include <utils/Looper.h> 26 27 #include <sensor/Sensor.h> 28 #include <sensor/BitTube.h> 29 #include <sensor/ISensorEventConnection.h> 30 31 #include <android/sensor.h> 32 33 using std::min; 34 35 // ---------------------------------------------------------------------------- 36 namespace android { 37 // ---------------------------------------------------------------------------- 38 39 SensorEventQueue::SensorEventQueue(const sp<ISensorEventConnection>& connection) 40 : mSensorEventConnection(connection), mRecBuffer(NULL), mAvailable(0), mConsumed(0), 41 mNumAcksToSend(0) { 42 mRecBuffer = new ASensorEvent[MAX_RECEIVE_BUFFER_EVENT_COUNT]; 43 } 44 45 SensorEventQueue::~SensorEventQueue() { 46 delete [] mRecBuffer; 47 } 48 49 void SensorEventQueue::onFirstRef() 50 { 51 mSensorChannel = mSensorEventConnection->getSensorChannel(); 52 } 53 54 int SensorEventQueue::getFd() const 55 { 56 return mSensorChannel->getFd(); 57 } 58 59 60 ssize_t SensorEventQueue::write(const sp<BitTube>& tube, 61 ASensorEvent const* events, size_t numEvents) { 62 return BitTube::sendObjects(tube, events, numEvents); 63 } 64 65 ssize_t SensorEventQueue::read(ASensorEvent* events, size_t numEvents) { 66 if (mAvailable == 0) { 67 ssize_t err = BitTube::recvObjects(mSensorChannel, 68 mRecBuffer, MAX_RECEIVE_BUFFER_EVENT_COUNT); 69 if (err < 0) { 70 return err; 71 } 72 mAvailable = static_cast<size_t>(err); 73 mConsumed = 0; 74 } 75 size_t count = min(numEvents, mAvailable); 76 memcpy(events, mRecBuffer + mConsumed, count * sizeof(ASensorEvent)); 77 mAvailable -= count; 78 mConsumed += count; 79 return static_cast<ssize_t>(count); 80 } 81 82 sp<Looper> SensorEventQueue::getLooper() const 83 { 84 Mutex::Autolock _l(mLock); 85 if (mLooper == 0) { 86 mLooper = new Looper(true); 87 mLooper->addFd(getFd(), getFd(), ALOOPER_EVENT_INPUT, NULL, NULL); 88 } 89 return mLooper; 90 } 91 92 status_t SensorEventQueue::waitForEvent() const 93 { 94 const int fd = getFd(); 95 sp<Looper> looper(getLooper()); 96 97 int events; 98 int32_t result; 99 do { 100 result = looper->pollOnce(-1, NULL, &events, NULL); 101 if (result == ALOOPER_POLL_ERROR) { 102 ALOGE("SensorEventQueue::waitForEvent error (errno=%d)", errno); 103 result = -EPIPE; // unknown error, so we make up one 104 break; 105 } 106 if (events & ALOOPER_EVENT_HANGUP) { 107 // the other-side has died 108 ALOGE("SensorEventQueue::waitForEvent error HANGUP"); 109 result = -EPIPE; // unknown error, so we make up one 110 break; 111 } 112 } while (result != fd); 113 114 return (result == fd) ? status_t(NO_ERROR) : result; 115 } 116 117 status_t SensorEventQueue::wake() const 118 { 119 sp<Looper> looper(getLooper()); 120 looper->wake(); 121 return NO_ERROR; 122 } 123 124 status_t SensorEventQueue::enableSensor(Sensor const* sensor) const { 125 return enableSensor(sensor, SENSOR_DELAY_NORMAL); 126 } 127 128 status_t SensorEventQueue::enableSensor(Sensor const* sensor, int32_t samplingPeriodUs) const { 129 return mSensorEventConnection->enableDisable(sensor->getHandle(), true, 130 us2ns(samplingPeriodUs), 0, 0); 131 } 132 133 status_t SensorEventQueue::disableSensor(Sensor const* sensor) const { 134 return mSensorEventConnection->enableDisable(sensor->getHandle(), false, 0, 0, 0); 135 } 136 137 status_t SensorEventQueue::enableSensor(int32_t handle, int32_t samplingPeriodUs, 138 int64_t maxBatchReportLatencyUs, int reservedFlags) const { 139 return mSensorEventConnection->enableDisable(handle, true, us2ns(samplingPeriodUs), 140 us2ns(maxBatchReportLatencyUs), reservedFlags); 141 } 142 143 status_t SensorEventQueue::flush() const { 144 return mSensorEventConnection->flush(); 145 } 146 147 status_t SensorEventQueue::disableSensor(int32_t handle) const { 148 return mSensorEventConnection->enableDisable(handle, false, 0, 0, false); 149 } 150 151 status_t SensorEventQueue::setEventRate(Sensor const* sensor, nsecs_t ns) const { 152 return mSensorEventConnection->setEventRate(sensor->getHandle(), ns); 153 } 154 155 status_t SensorEventQueue::injectSensorEvent(const ASensorEvent& event) { 156 do { 157 // Blocking call. 158 ssize_t size = ::send(mSensorChannel->getFd(), &event, sizeof(event), MSG_NOSIGNAL); 159 if (size >= 0) { 160 return NO_ERROR; 161 } else if (size < 0 && errno == EAGAIN) { 162 // If send is returning a "Try again" error, sleep for 100ms and try again. In all 163 // other cases log a failure and exit. 164 usleep(100000); 165 } else { 166 ALOGE("injectSensorEvent failure %s %zd", strerror(errno), size); 167 return INVALID_OPERATION; 168 } 169 } while (true); 170 } 171 172 void SensorEventQueue::sendAck(const ASensorEvent* events, int count) { 173 for (int i = 0; i < count; ++i) { 174 if (events[i].flags & WAKE_UP_SENSOR_EVENT_NEEDS_ACK) { 175 ++mNumAcksToSend; 176 } 177 } 178 // Send mNumAcksToSend to acknowledge for the wake up sensor events received. 179 if (mNumAcksToSend > 0) { 180 ssize_t size = ::send(mSensorChannel->getFd(), &mNumAcksToSend, sizeof(mNumAcksToSend), 181 MSG_DONTWAIT | MSG_NOSIGNAL); 182 if (size < 0) { 183 ALOGE("sendAck failure %zd %d", size, mNumAcksToSend); 184 } else { 185 mNumAcksToSend = 0; 186 } 187 } 188 return; 189 } 190 191 // ---------------------------------------------------------------------------- 192 }; // namespace android 193 194
