SensorService.h revision f001c92436b4a66eb7687286325ced7f10c9f917 
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_SERVICE_H
18#define ANDROID_SENSOR_SERVICE_H
19
20#include <stdint.h>
21#include <sys/types.h>
22
23#include <utils/Vector.h>
24#include <utils/SortedVector.h>
25#include <utils/KeyedVector.h>
26#include <utils/threads.h>
27#include <utils/RefBase.h>
28
29#include <binder/BinderService.h>
30#include <binder/Permission.h>
31
32#include <gui/Sensor.h>
33#include <gui/SensorChannel.h>
34#include <gui/ISensorServer.h>
35#include <gui/ISensorEventConnection.h>
36
37#include "SensorInterface.h"
38
39// ---------------------------------------------------------------------------
40
41struct sensors_poll_device_t;
42struct sensors_module_t;
43
44namespace android {
45// ---------------------------------------------------------------------------
46
47class SensorService :
48        public BinderService<SensorService>,
49        public BnSensorServer,
50        protected Thread
51{
52   friend class BinderService<SensorService>;
53
54   static const nsecs_t MINIMUM_EVENTS_PERIOD =   1000000; // 1000 Hz
55
56            SensorService();
57    virtual ~SensorService();
58
59    virtual void onFirstRef();
60
61    // Thread interface
62    virtual bool threadLoop();
63
64    // ISensorServer interface
65    virtual Vector<Sensor> getSensorList();
66    virtual sp<ISensorEventConnection> createSensorEventConnection();
67    virtual status_t dump(int fd, const Vector<String16>& args);
68
69
70    class SensorEventConnection : public BnSensorEventConnection {
71        virtual ~SensorEventConnection();
72        virtual void onFirstRef();
73        virtual sp<SensorChannel> getSensorChannel() const;
74        virtual status_t enableDisable(int handle, bool enabled);
75        virtual status_t setEventRate(int handle, nsecs_t ns);
76
77        sp<SensorService> const mService;
78        sp<SensorChannel> const mChannel;
79        mutable Mutex mConnectionLock;
80
81        // protected by SensorService::mLock
82        SortedVector<int> mSensorInfo;
83
84    public:
85        SensorEventConnection(const sp<SensorService>& service);
86
87        status_t sendEvents(sensors_event_t const* buffer, size_t count,
88                sensors_event_t* scratch = NULL);
89        bool hasSensor(int32_t handle) const;
90        bool hasAnySensor() const;
91        bool addSensor(int32_t handle);
92        bool removeSensor(int32_t handle);
93    };
94
95    class SensorRecord {
96        SortedVector< wp<SensorEventConnection> > mConnections;
97    public:
98        SensorRecord(const sp<SensorEventConnection>& connection);
99        bool addConnection(const sp<SensorEventConnection>& connection);
100        bool removeConnection(const wp<SensorEventConnection>& connection);
101        size_t getNumConnections() const { return mConnections.size(); }
102    };
103
104    SortedVector< wp<SensorEventConnection> > getActiveConnections() const;
105    DefaultKeyedVector<int, SensorInterface*> getActiveVirtualSensors() const;
106
107    String8 getSensorName(int handle) const;
108    void recordLastValue(sensors_event_t const * buffer, size_t count);
109    static void sortEventBuffer(sensors_event_t* buffer, size_t count);
110    void registerSensor(SensorInterface* sensor);
111    void registerVirtualSensor(SensorInterface* sensor);
112
113    // constants
114    Vector<Sensor> mSensorList;
115    DefaultKeyedVector<int, SensorInterface*> mSensorMap;
116    Vector<SensorInterface *> mVirtualSensorList;
117    Permission mDump;
118    status_t mInitCheck;
119
120    // protected by mLock
121    mutable Mutex mLock;
122    DefaultKeyedVector<int, SensorRecord*> mActiveSensors;
123    DefaultKeyedVector<int, SensorInterface*> mActiveVirtualSensors;
124    SortedVector< wp<SensorEventConnection> > mActiveConnections;
125
126    // The size of this vector is constant, only the items are mutable
127    KeyedVector<int32_t, sensors_event_t> mLastEventSeen;
128
129public:
130    static char const* getServiceName() { return "sensorservice"; }
131
132    void cleanupConnection(const wp<SensorEventConnection>& connection);
133    status_t enable(const sp<SensorEventConnection>& connection, int handle);
134    status_t disable(const sp<SensorEventConnection>& connection, int handle);
135    status_t setEventRate(const sp<SensorEventConnection>& connection, int handle, nsecs_t ns);
136};
137
138// ---------------------------------------------------------------------------
139}; // namespace android
140
141#endif // ANDROID_SENSOR_SERVICE_H
142