SensorEventQueue.h revision 701166d9f60a6e1149ff568aec0e03f3f3925292 
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#ifndef ANDROID_SENSOR_EVENT_QUEUE_H
18#define ANDROID_SENSOR_EVENT_QUEUE_H
19
20#include <stdint.h>
21#include <sys/types.h>
22
23#include <utils/Errors.h>
24#include <utils/RefBase.h>
25#include <utils/Timers.h>
26
27#include <gui/BitTube.h>
28
29// ----------------------------------------------------------------------------
30
31struct ALooper;
32struct ASensorEvent;
33
34// Concrete types for the NDK
35struct ASensorEventQueue {
36    ALooper* looper;
37};
38
39// ----------------------------------------------------------------------------
40namespace android {
41// ----------------------------------------------------------------------------
42
43class ISensorEventConnection;
44class Sensor;
45class Looper;
46
47// ----------------------------------------------------------------------------
48
49class SensorEventQueue : public ASensorEventQueue, public RefBase
50{
51public:
52
53    enum { MAX_RECEIVE_BUFFER_EVENT_COUNT = 256 };
54
55            SensorEventQueue(const sp<ISensorEventConnection>& connection);
56    virtual ~SensorEventQueue();
57    virtual void onFirstRef();
58
59    int getFd() const;
60
61    static ssize_t write(const sp<BitTube>& tube,
62            ASensorEvent const* events, size_t numEvents);
63
64    ssize_t read(ASensorEvent* events, size_t numEvents);
65
66    status_t waitForEvent() const;
67    status_t wake() const;
68
69    status_t enableSensor(Sensor const* sensor) const;
70    status_t disableSensor(Sensor const* sensor) const;
71    status_t setEventRate(Sensor const* sensor, nsecs_t ns) const;
72
73    // these are here only to support SensorManager.java
74    status_t enableSensor(int32_t handle, int32_t samplingPeriodUs, int maxBatchReportLatencyUs,
75                          int reservedFlags) const;
76    status_t disableSensor(int32_t handle) const;
77    status_t flush() const;
78
79private:
80    sp<Looper> getLooper() const;
81    sp<ISensorEventConnection> mSensorEventConnection;
82    sp<BitTube> mSensorChannel;
83    mutable Mutex mLock;
84    mutable sp<Looper> mLooper;
85    ASensorEvent* mRecBuffer;
86    size_t mAvailable;
87    size_t mConsumed;
88};
89
90// ----------------------------------------------------------------------------
91}; // namespace android
92
93#endif // ANDROID_SENSOR_EVENT_QUEUE_H
94