SensorService.h revision 5307d17fe33fc26eeeacd6339a9fbfe96cf56873 
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
31#include <gui/Sensor.h>
32#include <gui/BitTube.h>
33#include <gui/ISensorServer.h>
34#include <gui/ISensorEventConnection.h>
35
36#include "SensorInterface.h"
37
38// ---------------------------------------------------------------------------
39
40#define DEBUG_CONNECTIONS   false
41
42struct sensors_poll_device_t;
43struct sensors_module_t;
44
45namespace android {
46// ---------------------------------------------------------------------------
47
48class SensorService :
49        public BinderService<SensorService>,
50        public BnSensorServer,
51        protected Thread
52{
53   friend class BinderService<SensorService>;
54
55   static const nsecs_t MINIMUM_EVENTS_PERIOD =   1000000; // 1000 Hz
56
57            SensorService();
58    virtual ~SensorService();
59
60    virtual void onFirstRef();
61
62    // Thread interface
63    virtual bool threadLoop();
64
65    // ISensorServer interface
66    virtual Vector<Sensor> getSensorList();
67    virtual sp<ISensorEventConnection> createSensorEventConnection();
68    virtual status_t dump(int fd, const Vector<String16>& args);
69
70
71    class SensorEventConnection : public BnSensorEventConnection {
72        virtual ~SensorEventConnection();
73        virtual void onFirstRef();
74        virtual sp<BitTube> getSensorChannel() const;
75        virtual status_t enableDisable(int handle, bool enabled);
76        virtual status_t setEventRate(int handle, nsecs_t ns);
77
78        sp<SensorService> const mService;
79        sp<BitTube> const mChannel;
80        uid_t mUid;
81        mutable Mutex mConnectionLock;
82
83        // protected by SensorService::mLock
84        SortedVector<int> mSensorInfo;
85
86    public:
87        SensorEventConnection(const sp<SensorService>& service, uid_t uid);
88
89        status_t sendEvents(sensors_event_t const* buffer, size_t count,
90                sensors_event_t* scratch = NULL);
91        bool hasSensor(int32_t handle) const;
92        bool hasAnySensor() const;
93        bool addSensor(int32_t handle);
94        bool removeSensor(int32_t handle);
95
96        uid_t getUid() const { return mUid; }
97    };
98
99    class SensorRecord {
100        SortedVector< wp<SensorEventConnection> > mConnections;
101    public:
102        SensorRecord(const sp<SensorEventConnection>& connection);
103        bool addConnection(const sp<SensorEventConnection>& connection);
104        bool removeConnection(const wp<SensorEventConnection>& connection);
105        size_t getNumConnections() const { return mConnections.size(); }
106    };
107
108    SortedVector< wp<SensorEventConnection> > getActiveConnections() const;
109    DefaultKeyedVector<int, SensorInterface*> getActiveVirtualSensors() const;
110
111    String8 getSensorName(int handle) const;
112    void recordLastValue(sensors_event_t const * buffer, size_t count);
113    static void sortEventBuffer(sensors_event_t* buffer, size_t count);
114    void registerSensor(SensorInterface* sensor);
115    void registerVirtualSensor(SensorInterface* sensor);
116
117    // constants
118    Vector<Sensor> mSensorList;
119    Vector<Sensor> mUserSensorListDebug;
120    Vector<Sensor> mUserSensorList;
121    DefaultKeyedVector<int, SensorInterface*> mSensorMap;
122    Vector<SensorInterface *> mVirtualSensorList;
123    status_t mInitCheck;
124
125    // protected by mLock
126    mutable Mutex mLock;
127    DefaultKeyedVector<int, SensorRecord*> mActiveSensors;
128    DefaultKeyedVector<int, SensorInterface*> mActiveVirtualSensors;
129    SortedVector< wp<SensorEventConnection> > mActiveConnections;
130
131    // The size of this vector is constant, only the items are mutable
132    KeyedVector<int32_t, sensors_event_t> mLastEventSeen;
133
134public:
135    static char const* getServiceName() { return "sensorservice"; }
136
137    void cleanupConnection(SensorEventConnection* connection);
138    status_t enable(const sp<SensorEventConnection>& connection, int handle);
139    status_t disable(const sp<SensorEventConnection>& connection, int handle);
140    status_t setEventRate(const sp<SensorEventConnection>& connection, int handle, nsecs_t ns);
141};
142
143// ---------------------------------------------------------------------------
144}; // namespace android
145
146#endif // ANDROID_SENSOR_SERVICE_H
147