SensorService.h revision 24d72350f321c17b0bfe1ef3fd52d4070a1c02c3 
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// ---------------------------------------------------------------------------
38
39struct sensors_poll_device_t;
40struct sensors_module_t;
41
42namespace android {
43// ---------------------------------------------------------------------------
44
45class SensorService :
46        public BinderService<SensorService>,
47        public BnSensorServer,
48        protected Thread
49{
50   friend class BinderService<SensorService>;
51
52   static const nsecs_t MINIMUM_EVENTS_PERIOD =   1000000; // 1000 Hz
53   static const nsecs_t DEFAULT_EVENTS_PERIOD = 200000000; //    5 Hz
54
55            SensorService();
56    virtual ~SensorService();
57
58    virtual void onFirstRef();
59
60    // Thread interface
61    virtual bool threadLoop();
62
63    // ISensorServer interface
64    virtual Vector<Sensor> getSensorList();
65    virtual sp<ISensorEventConnection> createSensorEventConnection();
66    virtual status_t dump(int fd, const Vector<String16>& args);
67
68
69    class SensorEventConnection : public BnSensorEventConnection {
70        virtual ~SensorEventConnection();
71        virtual void onFirstRef();
72        virtual sp<SensorChannel> getSensorChannel() const;
73        virtual status_t enableDisable(int handle, bool enabled);
74        virtual status_t setEventRate(int handle, nsecs_t ns);
75
76        sp<SensorService> const mService;
77        sp<SensorChannel> const mChannel;
78
79        // protected by SensorService::mLock
80        struct SensorInfo {
81            SensorInfo() : ns(DEFAULT_EVENTS_PERIOD) { }
82            nsecs_t ns;
83        };
84        DefaultKeyedVector<int32_t, SensorInfo> mSensorInfo;
85
86    public:
87        SensorEventConnection(const sp<SensorService>& service);
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        status_t setEventRateLocked(int handle, nsecs_t ns);
96        nsecs_t getEventRateForSensor(int32_t handle) const {
97            return mSensorInfo.valueFor(handle).ns;
98        }
99    };
100
101    class SensorRecord {
102        SortedVector< wp<SensorEventConnection> > mConnections;
103    public:
104        SensorRecord(const sp<SensorEventConnection>& connection);
105        bool addConnection(const sp<SensorEventConnection>& connection);
106        bool removeConnection(const wp<SensorEventConnection>& connection);
107        size_t getNumConnections() const { return mConnections.size(); }
108    };
109
110    SortedVector< wp<SensorEventConnection> > getActiveConnections() const;
111    String8 getSensorName(int handle) const;
112    status_t recomputeEventsPeriodLocked(int32_t handle);
113
114    // constants
115    Vector<Sensor> mSensorList;
116    struct sensors_poll_device_t* mSensorDevice;
117    struct sensors_module_t* mSensorModule;
118    Permission mDump;
119    status_t mInitCheck;
120
121    // protected by mLock
122    mutable Mutex mLock;
123    DefaultKeyedVector<int, SensorRecord*> mActiveSensors;
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