SensorService.h revision ac9a96da65f6eae4513654adaad8a457d1c1575c 
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   static const char* WAKE_LOCK_NAME;
57
58            SensorService();
59    virtual ~SensorService();
60
61    virtual void onFirstRef();
62
63    // Thread interface
64    virtual bool threadLoop();
65
66    // ISensorServer interface
67    virtual Vector<Sensor> getSensorList();
68    virtual sp<ISensorEventConnection> createSensorEventConnection();
69    virtual status_t dump(int fd, const Vector<String16>& args);
70
71
72    class SensorEventConnection : public BnSensorEventConnection {
73        virtual ~SensorEventConnection();
74        virtual void onFirstRef();
75        virtual sp<BitTube> getSensorChannel() const;
76        virtual status_t enableDisable(int handle, bool enabled);
77        virtual status_t setEventRate(int handle, nsecs_t ns);
78
79        sp<SensorService> const mService;
80        sp<BitTube> const mChannel;
81        uid_t mUid;
82        mutable Mutex mConnectionLock;
83
84        // protected by SensorService::mLock
85        SortedVector<int> mSensorInfo;
86
87    public:
88        SensorEventConnection(const sp<SensorService>& service, uid_t uid);
89
90        status_t sendEvents(sensors_event_t const* buffer, size_t count,
91                sensors_event_t* scratch = NULL);
92        bool hasSensor(int32_t handle) const;
93        bool hasAnySensor() const;
94        bool addSensor(int32_t handle);
95        bool removeSensor(int32_t handle);
96
97        uid_t getUid() const { return mUid; }
98    };
99
100    class SensorRecord {
101        SortedVector< wp<SensorEventConnection> > mConnections;
102    public:
103        SensorRecord(const sp<SensorEventConnection>& connection);
104        bool addConnection(const sp<SensorEventConnection>& connection);
105        bool removeConnection(const wp<SensorEventConnection>& connection);
106        size_t getNumConnections() const { return mConnections.size(); }
107    };
108
109    SortedVector< wp<SensorEventConnection> > getActiveConnections() const;
110    DefaultKeyedVector<int, SensorInterface*> getActiveVirtualSensors() const;
111
112    String8 getSensorName(int handle) const;
113    int getSensorType(int handle) const;
114    void recordLastValue(sensors_event_t const * buffer, size_t count);
115    static void sortEventBuffer(sensors_event_t* buffer, size_t count);
116    void registerSensor(SensorInterface* sensor);
117    void registerVirtualSensor(SensorInterface* sensor);
118    status_t cleanupWithoutDisable(
119            const sp<SensorEventConnection>& connection, int handle);
120    status_t cleanupWithoutDisableLocked(
121            const sp<SensorEventConnection>& connection, int handle);
122    void cleanupAutoDisabledSensor(const sp<SensorEventConnection>& connection,
123        sensors_event_t const* buffer, const int count);
124
125    // constants
126    Vector<Sensor> mSensorList;
127    Vector<Sensor> mUserSensorListDebug;
128    Vector<Sensor> mUserSensorList;
129    DefaultKeyedVector<int, SensorInterface*> mSensorMap;
130    Vector<SensorInterface *> mVirtualSensorList;
131    status_t mInitCheck;
132
133    // protected by mLock
134    mutable Mutex mLock;
135    DefaultKeyedVector<int, SensorRecord*> mActiveSensors;
136    DefaultKeyedVector<int, SensorInterface*> mActiveVirtualSensors;
137    SortedVector< wp<SensorEventConnection> > mActiveConnections;
138
139    // The size of this vector is constant, only the items are mutable
140    KeyedVector<int32_t, sensors_event_t> mLastEventSeen;
141
142public:
143    static char const* getServiceName() { return "sensorservice"; }
144
145    void cleanupConnection(SensorEventConnection* connection);
146    status_t enable(const sp<SensorEventConnection>& connection, int handle);
147    status_t disable(const sp<SensorEventConnection>& connection, int handle);
148    status_t setEventRate(const sp<SensorEventConnection>& connection, int handle, nsecs_t ns);
149};
150
151// ---------------------------------------------------------------------------
152}; // namespace android
153
154#endif // ANDROID_SENSOR_SERVICE_H
155