a48bcf62b6
Exposed the new "min delay" sensor property through native and java sensor apis. This allows the caller to know what is the maximum rate at which a sensor can return events, or, if a sensor works in "update" mode (events returned only when the value changes). Also augmented SensorManager.regusterSensorEvent() so that it can accept a value in microsecond in addition to the 4 constants already defined. Change-Id: If425e9979892666df8c989d7de3c362230fa19e0
136 lines
3.8 KiB
C++
136 lines
3.8 KiB
C++
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "Sensors"
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#include <stdint.h>
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#include <sys/types.h>
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#include <utils/Errors.h>
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#include <utils/RefBase.h>
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#include <utils/PollLoop.h>
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#include <gui/Sensor.h>
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#include <gui/SensorChannel.h>
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#include <gui/SensorEventQueue.h>
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#include <gui/ISensorEventConnection.h>
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#include <android/sensor.h>
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// ----------------------------------------------------------------------------
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namespace android {
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// ----------------------------------------------------------------------------
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SensorEventQueue::SensorEventQueue(const sp<ISensorEventConnection>& connection)
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: mSensorEventConnection(connection)
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{
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}
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SensorEventQueue::~SensorEventQueue()
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{
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}
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void SensorEventQueue::onFirstRef()
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{
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mSensorChannel = mSensorEventConnection->getSensorChannel();
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}
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int SensorEventQueue::getFd() const
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{
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return mSensorChannel->getFd();
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}
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ssize_t SensorEventQueue::write(ASensorEvent const* events, size_t numEvents)
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{
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ssize_t size = mSensorChannel->write(events, numEvents * sizeof(events[0]));
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if (size >= 0) {
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if (size % sizeof(events[0])) {
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// partial write!!! should never happen.
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return -EINVAL;
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}
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// returns number of events written
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size /= sizeof(events[0]);
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}
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return size;
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}
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ssize_t SensorEventQueue::read(ASensorEvent* events, size_t numEvents)
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{
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ssize_t size = mSensorChannel->read(events, numEvents*sizeof(events[0]));
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if (size >= 0) {
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if (size % sizeof(events[0])) {
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// partial read!!! should never happen.
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return -EINVAL;
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}
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// returns number of events read
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size /= sizeof(events[0]);
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}
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return size;
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}
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sp<PollLoop> SensorEventQueue::getPollLoop() const
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{
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Mutex::Autolock _l(mLock);
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if (mPollLoop == 0) {
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mPollLoop = new PollLoop(true);
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mPollLoop->setCallback(getFd(), POLLIN, NULL, NULL);
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}
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return mPollLoop;
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}
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status_t SensorEventQueue::waitForEvent() const
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{
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const int fd = getFd();
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sp<PollLoop> pollLoop(getPollLoop());
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int32_t result = pollLoop->pollOnce(-1, NULL, NULL);
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return (result == fd) ? NO_ERROR : -1;
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}
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status_t SensorEventQueue::wake() const
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{
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sp<PollLoop> pollLoop(getPollLoop());
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pollLoop->wake();
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return NO_ERROR;
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}
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status_t SensorEventQueue::enableSensor(Sensor const* sensor) const {
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return mSensorEventConnection->enableDisable(sensor->getHandle(), true);
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}
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status_t SensorEventQueue::disableSensor(Sensor const* sensor) const {
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return mSensorEventConnection->enableDisable(sensor->getHandle(), false);
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}
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status_t SensorEventQueue::enableSensor(int32_t handle, int32_t us) const {
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status_t err = mSensorEventConnection->enableDisable(handle, true);
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if (err == NO_ERROR) {
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mSensorEventConnection->setEventRate(handle, us2ns(us));
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}
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return err;
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}
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status_t SensorEventQueue::disableSensor(int32_t handle) const {
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return mSensorEventConnection->enableDisable(handle, false);
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}
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status_t SensorEventQueue::setEventRate(Sensor const* sensor, nsecs_t ns) const {
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return mSensorEventConnection->setEventRate(sensor->getHandle(), ns);
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}
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// ----------------------------------------------------------------------------
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}; // namespace android
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