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/*
* 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 <stdint.h>
#include <sys/types.h>
#include <utils/Errors.h>
#include <utils/RefBase.h>
#include <utils/Looper.h>
#include <gui/Sensor.h>
#include <gui/SensorChannel.h>
#include <gui/SensorEventQueue.h>
#include <gui/ISensorEventConnection.h>
#include <android/sensor.h>
// ----------------------------------------------------------------------------
namespace android {
// ----------------------------------------------------------------------------
SensorEventQueue::SensorEventQueue(const sp<ISensorEventConnection>& connection)
: mSensorEventConnection(connection)
{
}
SensorEventQueue::~SensorEventQueue()
{
}
void SensorEventQueue::onFirstRef()
{
mSensorChannel = mSensorEventConnection->getSensorChannel();
}
int SensorEventQueue::getFd() const
{
return mSensorChannel->getFd();
}
ssize_t SensorEventQueue::write(ASensorEvent const* events, size_t numEvents)
{
ssize_t size = mSensorChannel->write(events, numEvents * sizeof(events[0]));
if (size >= 0) {
if (size % sizeof(events[0])) {
// partial write!!! should never happen.
return -EINVAL;
}
// returns number of events written
size /= sizeof(events[0]);
}
return size;
}
ssize_t SensorEventQueue::read(ASensorEvent* events, size_t numEvents)
{
ssize_t size = mSensorChannel->read(events, numEvents*sizeof(events[0]));
LOGE_IF(size<0 && size!=-EAGAIN,
"SensorChannel::read error (%s)", strerror(-size));
if (size >= 0) {
if (size % sizeof(events[0])) {
// partial read!!! should never happen.
LOGE("SensorEventQueue partial read (event-size=%u, read=%d)",
sizeof(events[0]), int(size));
return -EINVAL;
}
// returns number of events read
size /= sizeof(events[0]);
}
return size;
}
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());
int32_t result;
do {
result = looper->pollOnce(-1);
if (result == ALOOPER_EVENT_ERROR) {
LOGE("SensorChannel::waitForEvent error (errno=%d)", errno);
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 mSensorEventConnection->enableDisable(sensor->getHandle(), true);
}
status_t SensorEventQueue::disableSensor(Sensor const* sensor) const {
return mSensorEventConnection->enableDisable(sensor->getHandle(), false);
}
status_t SensorEventQueue::enableSensor(int32_t handle, int32_t us) const {
status_t err = mSensorEventConnection->enableDisable(handle, true);
if (err == NO_ERROR) {
mSensorEventConnection->setEventRate(handle, us2ns(us));
}
return err;
}
status_t SensorEventQueue::disableSensor(int32_t handle) const {
return mSensorEventConnection->enableDisable(handle, false);
}
status_t SensorEventQueue::setEventRate(Sensor const* sensor, nsecs_t ns) const {
return mSensorEventConnection->setEventRate(sensor->getHandle(), ns);
}
// ----------------------------------------------------------------------------
}; // namespace android
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