| /* |
| * Copyright (C) 2010 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #define LOG_TAG "Sensors" |
| |
| #include <algorithm> |
| #include <stdint.h> |
| #include <sys/types.h> |
| #include <sys/socket.h> |
| #include <linux/errno.h> |
| |
| #include <utils/Errors.h> |
| #include <utils/RefBase.h> |
| #include <utils/Looper.h> |
| |
| #include <gui/Sensor.h> |
| #include <gui/BitTube.h> |
| #include <gui/SensorEventQueue.h> |
| #include <gui/ISensorEventConnection.h> |
| |
| #include <android/sensor.h> |
| |
| using std::min; |
| |
| // ---------------------------------------------------------------------------- |
| namespace android { |
| // ---------------------------------------------------------------------------- |
| |
| SensorEventQueue::SensorEventQueue(const sp<ISensorEventConnection>& connection) |
| : mSensorEventConnection(connection), mRecBuffer(NULL), mAvailable(0), mConsumed(0), |
| mNumAcksToSend(0) { |
| mRecBuffer = new ASensorEvent[MAX_RECEIVE_BUFFER_EVENT_COUNT]; |
| } |
| |
| SensorEventQueue::~SensorEventQueue() { |
| delete [] mRecBuffer; |
| } |
| |
| void SensorEventQueue::onFirstRef() |
| { |
| mSensorChannel = mSensorEventConnection->getSensorChannel(); |
| } |
| |
| int SensorEventQueue::getFd() const |
| { |
| return mSensorChannel->getFd(); |
| } |
| |
| |
| ssize_t SensorEventQueue::write(const sp<BitTube>& tube, |
| ASensorEvent const* events, size_t numEvents) { |
| return BitTube::sendObjects(tube, events, numEvents); |
| } |
| |
| ssize_t SensorEventQueue::read(ASensorEvent* events, size_t numEvents) { |
| if (mAvailable == 0) { |
| ssize_t err = BitTube::recvObjects(mSensorChannel, |
| mRecBuffer, MAX_RECEIVE_BUFFER_EVENT_COUNT); |
| if (err < 0) { |
| return err; |
| } |
| mAvailable = static_cast<size_t>(err); |
| mConsumed = 0; |
| } |
| size_t count = min(numEvents, mAvailable); |
| memcpy(events, mRecBuffer + mConsumed, count * sizeof(ASensorEvent)); |
| mAvailable -= count; |
| mConsumed += count; |
| return static_cast<ssize_t>(count); |
| } |
| |
| sp<Looper> SensorEventQueue::getLooper() const |
| { |
| Mutex::Autolock _l(mLock); |
| if (mLooper == 0) { |
| mLooper = new Looper(true); |
| mLooper->addFd(getFd(), getFd(), ALOOPER_EVENT_INPUT, NULL, NULL); |
| } |
| return mLooper; |
| } |
| |
| status_t SensorEventQueue::waitForEvent() const |
| { |
| const int fd = getFd(); |
| sp<Looper> looper(getLooper()); |
| |
| int events; |
| int32_t result; |
| do { |
| result = looper->pollOnce(-1, NULL, &events, NULL); |
| if (result == ALOOPER_POLL_ERROR) { |
| ALOGE("SensorEventQueue::waitForEvent error (errno=%d)", errno); |
| result = -EPIPE; // unknown error, so we make up one |
| break; |
| } |
| if (events & ALOOPER_EVENT_HANGUP) { |
| // the other-side has died |
| ALOGE("SensorEventQueue::waitForEvent error HANGUP"); |
| result = -EPIPE; // unknown error, so we make up one |
| break; |
| } |
| } while (result != fd); |
| |
| return (result == fd) ? status_t(NO_ERROR) : result; |
| } |
| |
| status_t SensorEventQueue::wake() const |
| { |
| sp<Looper> looper(getLooper()); |
| looper->wake(); |
| return NO_ERROR; |
| } |
| |
| status_t SensorEventQueue::enableSensor(Sensor const* sensor) const { |
| return enableSensor(sensor, SENSOR_DELAY_NORMAL); |
| } |
| |
| status_t SensorEventQueue::enableSensor(Sensor const* sensor, int32_t samplingPeriodUs) const { |
| return mSensorEventConnection->enableDisable(sensor->getHandle(), true, |
| us2ns(samplingPeriodUs), 0, 0); |
| } |
| |
| status_t SensorEventQueue::disableSensor(Sensor const* sensor) const { |
| return mSensorEventConnection->enableDisable(sensor->getHandle(), false, 0, 0, 0); |
| } |
| |
| status_t SensorEventQueue::enableSensor(int32_t handle, int32_t samplingPeriodUs, |
| int maxBatchReportLatencyUs, int reservedFlags) const { |
| return mSensorEventConnection->enableDisable(handle, true, us2ns(samplingPeriodUs), |
| us2ns(maxBatchReportLatencyUs), reservedFlags); |
| } |
| |
| status_t SensorEventQueue::flush() const { |
| return mSensorEventConnection->flush(); |
| } |
| |
| status_t SensorEventQueue::disableSensor(int32_t handle) const { |
| return mSensorEventConnection->enableDisable(handle, false, 0, 0, false); |
| } |
| |
| status_t SensorEventQueue::setEventRate(Sensor const* sensor, nsecs_t ns) const { |
| return mSensorEventConnection->setEventRate(sensor->getHandle(), ns); |
| } |
| |
| status_t SensorEventQueue::injectSensorEvent(const ASensorEvent& event) { |
| do { |
| // Blocking call. |
| ssize_t size = ::send(mSensorChannel->getFd(), &event, sizeof(event), MSG_NOSIGNAL); |
| if (size >= 0) { |
| return NO_ERROR; |
| } else if (size < 0 && errno == EAGAIN) { |
| // If send is returning a "Try again" error, sleep for 100ms and try again. In all |
| // other cases log a failure and exit. |
| usleep(100000); |
| } else { |
| ALOGE("injectSensorEvent failure %s %zd", strerror(errno), size); |
| return INVALID_OPERATION; |
| } |
| } while (true); |
| } |
| |
| void SensorEventQueue::sendAck(const ASensorEvent* events, int count) { |
| for (int i = 0; i < count; ++i) { |
| if (events[i].flags & WAKE_UP_SENSOR_EVENT_NEEDS_ACK) { |
| ++mNumAcksToSend; |
| } |
| } |
| // Send mNumAcksToSend to acknowledge for the wake up sensor events received. |
| if (mNumAcksToSend > 0) { |
| ssize_t size = ::send(mSensorChannel->getFd(), &mNumAcksToSend, sizeof(mNumAcksToSend), |
| MSG_DONTWAIT | MSG_NOSIGNAL); |
| if (size < 0) { |
| ALOGE("sendAck failure %zd %d", size, mNumAcksToSend); |
| } else { |
| mNumAcksToSend = 0; |
| } |
| } |
| return; |
| } |
| |
| // ---------------------------------------------------------------------------- |
| }; // namespace android |
| |