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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.
*/
#ifndef ANDROID_SENSOR_EVENT_QUEUE_H
#define ANDROID_SENSOR_EVENT_QUEUE_H
#include <stdint.h>
#include <sys/types.h>
#include <utils/Errors.h>
#include <utils/RefBase.h>
#include <utils/Timers.h>
#include <utils/String16.h>
#include <gui/BitTube.h>
// ----------------------------------------------------------------------------
#define WAKE_UP_SENSOR_EVENT_NEEDS_ACK (1U << 31)
struct ALooper;
struct ASensorEvent;
// Concrete types for the NDK
struct ASensorEventQueue {
ALooper* looper;
};
// ----------------------------------------------------------------------------
namespace android {
// ----------------------------------------------------------------------------
class ISensorEventConnection;
class Sensor;
class Looper;
// ----------------------------------------------------------------------------
class SensorEventQueue : public ASensorEventQueue, public RefBase
{
public:
enum { MAX_RECEIVE_BUFFER_EVENT_COUNT = 256 };
SensorEventQueue(const sp<ISensorEventConnection>& connection);
virtual ~SensorEventQueue();
virtual void onFirstRef();
int getFd() const;
static ssize_t write(const sp<BitTube>& tube,
ASensorEvent const* events, size_t numEvents);
ssize_t read(ASensorEvent* events, size_t numEvents);
status_t waitForEvent() const;
status_t wake() const;
status_t enableSensor(Sensor const* sensor) const;
status_t disableSensor(Sensor const* sensor) const;
status_t setEventRate(Sensor const* sensor, nsecs_t ns) const;
// these are here only to support SensorManager.java
status_t enableSensor(int32_t handle, int32_t samplingPeriodUs, int maxBatchReportLatencyUs,
int reservedFlags) const;
status_t disableSensor(int32_t handle) const;
status_t flush() const;
// Send an ack for every wake_up sensor event that is set to WAKE_UP_SENSOR_EVENT_NEEDS_ACK.
void sendAck(const ASensorEvent* events, int count);
status_t injectSensorEvent(const ASensorEvent& event);
private:
sp<Looper> getLooper() const;
sp<ISensorEventConnection> mSensorEventConnection;
sp<BitTube> mSensorChannel;
mutable Mutex mLock;
mutable sp<Looper> mLooper;
ASensorEvent* mRecBuffer;
size_t mAvailable;
size_t mConsumed;
uint32_t mNumAcksToSend;
};
// ----------------------------------------------------------------------------
}; // namespace android
#endif // ANDROID_SENSOR_EVENT_QUEUE_H
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