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 <algorithm> 20 #include <stdint.h> 21 #include <sys/types.h> 22 #include <sys/socket.h> 23 #include <linux/errno.h> 24 25 #include <utils/Errors.h> 26 #include <utils/RefBase.h> 27 #include <utils/Looper.h> 28 29 #include <gui/Sensor.h> 30 #include <gui/BitTube.h> 31 #include <gui/SensorEventQueue.h> 32 #include <gui/ISensorEventConnection.h> 33 34 #include <android/sensor.h> 35 36 using std::min; 37 38 // ---------------------------------------------------------------------------- 39 namespace android { 40 // ---------------------------------------------------------------------------- 41 42 SensorEventQueue::SensorEventQueue(const sp<ISensorEventConnection>& connection) 43 : mSensorEventConnection(connection), mRecBuffer(NULL), mAvailable(0), mConsumed(0), 44 mNumAcksToSend(0) { 45 mRecBuffer = new ASensorEvent[MAX_RECEIVE_BUFFER_EVENT_COUNT]; 46 } 47 48 SensorEventQueue::~SensorEventQueue() { 49 delete [] mRecBuffer; 50 } 51 52 void SensorEventQueue::onFirstRef() 53 { 54 mSensorChannel = mSensorEventConnection->getSensorChannel(); 55 } 56 57 int SensorEventQueue::getFd() const 58 { 59 return mSensorChannel->getFd(); 60 } 61 62 63 ssize_t SensorEventQueue::write(const sp<BitTube>& tube, 64 ASensorEvent const* events, size_t numEvents) { 65 return BitTube::sendObjects(tube, events, numEvents); 66 } 67 68 ssize_t SensorEventQueue::read(ASensorEvent* events, size_t numEvents) { 69 if (mAvailable == 0) { 70 ssize_t err = BitTube::recvObjects(mSensorChannel, 71 mRecBuffer, MAX_RECEIVE_BUFFER_EVENT_COUNT); 72 if (err < 0) { 73 return err; 74 } 75 mAvailable = static_cast<size_t>(err); 76 mConsumed = 0; 77 } 78 size_t count = min(numEvents, mAvailable); 79 memcpy(events, mRecBuffer + mConsumed, count * sizeof(ASensorEvent)); 80 mAvailable -= count; 81 mConsumed += count; 82 return static_cast<ssize_t>(count); 83 } 84 85 sp<Looper> SensorEventQueue::getLooper() const 86 { 87 Mutex::Autolock _l(mLock); 88 if (mLooper == 0) { 89 mLooper = new Looper(true); 90 mLooper->addFd(getFd(), getFd(), ALOOPER_EVENT_INPUT, NULL, NULL); 91 } 92 return mLooper; 93 } 94 95 status_t SensorEventQueue::waitForEvent() const 96 { 97 const int fd = getFd(); 98 sp<Looper> looper(getLooper()); 99 100 int events; 101 int32_t result; 102 do { 103 result = looper->pollOnce(-1, NULL, &events, NULL); 104 if (result == ALOOPER_POLL_ERROR) { 105 ALOGE("SensorEventQueue::waitForEvent error (errno=%d)", errno); 106 result = -EPIPE; // unknown error, so we make up one 107 break; 108 } 109 if (events & ALOOPER_EVENT_HANGUP) { 110 // the other-side has died 111 ALOGE("SensorEventQueue::waitForEvent error HANGUP"); 112 result = -EPIPE; // unknown error, so we make up one 113 break; 114 } 115 } while (result != fd); 116 117 return (result == fd) ? status_t(NO_ERROR) : result; 118 } 119 120 status_t SensorEventQueue::wake() const 121 { 122 sp<Looper> looper(getLooper()); 123 looper->wake(); 124 return NO_ERROR; 125 } 126 127 status_t SensorEventQueue::enableSensor(Sensor const* sensor) const { 128 return enableSensor(sensor, SENSOR_DELAY_NORMAL); 129 } 130 131 status_t SensorEventQueue::enableSensor(Sensor const* sensor, int32_t samplingPeriodUs) const { 132 return mSensorEventConnection->enableDisable(sensor->getHandle(), true, 133 us2ns(samplingPeriodUs), 0, 0); 134 } 135 136 status_t SensorEventQueue::disableSensor(Sensor const* sensor) const { 137 return mSensorEventConnection->enableDisable(sensor->getHandle(), false, 0, 0, 0); 138 } 139 140 status_t SensorEventQueue::enableSensor(int32_t handle, int32_t samplingPeriodUs, 141 int maxBatchReportLatencyUs, int reservedFlags) const { 142 return mSensorEventConnection->enableDisable(handle, true, us2ns(samplingPeriodUs), 143 us2ns(maxBatchReportLatencyUs), reservedFlags); 144 } 145 146 status_t SensorEventQueue::flush() const { 147 return mSensorEventConnection->flush(); 148 } 149 150 status_t SensorEventQueue::disableSensor(int32_t handle) const { 151 return mSensorEventConnection->enableDisable(handle, false, 0, 0, false); 152 } 153 154 status_t SensorEventQueue::setEventRate(Sensor const* sensor, nsecs_t ns) const { 155 return mSensorEventConnection->setEventRate(sensor->getHandle(), ns); 156 } 157 158 status_t SensorEventQueue::injectSensorEvent(const ASensorEvent& event) { 159 do { 160 // Blocking call. 161 ssize_t size = ::send(mSensorChannel->getFd(), &event, sizeof(event), MSG_NOSIGNAL); 162 if (size >= 0) { 163 return NO_ERROR; 164 } else if (size < 0 && errno == EAGAIN) { 165 // If send is returning a "Try again" error, sleep for 100ms and try again. In all 166 // other cases log a failure and exit. 167 usleep(100000); 168 } else { 169 ALOGE("injectSensorEvent failure %s %zd", strerror(errno), size); 170 return INVALID_OPERATION; 171 } 172 } while (true); 173 } 174 175 void SensorEventQueue::sendAck(const ASensorEvent* events, int count) { 176 for (int i = 0; i < count; ++i) { 177 if (events[i].flags & WAKE_UP_SENSOR_EVENT_NEEDS_ACK) { 178 ++mNumAcksToSend; 179 } 180 } 181 // Send mNumAcksToSend to acknowledge for the wake up sensor events received. 182 if (mNumAcksToSend > 0) { 183 ssize_t size = ::send(mSensorChannel->getFd(), &mNumAcksToSend, sizeof(mNumAcksToSend), 184 MSG_DONTWAIT | MSG_NOSIGNAL); 185 if (size < 0) { 186 ALOGE("sendAck failure %zd %d", size, mNumAcksToSend); 187 } else { 188 mNumAcksToSend = 0; 189 } 190 } 191 return; 192 } 193 194 // ---------------------------------------------------------------------------- 195 }; // namespace android 196 197
