SensorService.h revision 51224681c9a80ff714d40c26d8f465fb1bae17e2 
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 "SensorList.h"
21#include "RecentEventLogger.h"
22
23#include <binder/BinderService.h>
24#include <cutils/compiler.h>
25#include <sensor/ISensorServer.h>
26#include <sensor/ISensorEventConnection.h>
27#include <sensor/Sensor.h>
28
29#include <utils/AndroidThreads.h>
30#include <utils/KeyedVector.h>
31#include <utils/Looper.h>
32#include <utils/SortedVector.h>
33#include <utils/String8.h>
34#include <utils/Vector.h>
35#include <utils/threads.h>
36
37#include <stdint.h>
38#include <sys/types.h>
39#include <unordered_map>
40#include <unordered_set>
41
42#if __clang__
43// Clang warns about SensorEventConnection::dump hiding BBinder::dump. The cause isn't fixable
44// without changing the API, so let's tell clang this is indeed intentional.
45#pragma clang diagnostic ignored "-Woverloaded-virtual"
46#endif
47
48// ---------------------------------------------------------------------------
49#define IGNORE_HARDWARE_FUSION  false
50#define DEBUG_CONNECTIONS   false
51// Max size is 100 KB which is enough to accept a batch of about 1000 events.
52#define MAX_SOCKET_BUFFER_SIZE_BATCHED (100 * 1024)
53// For older HALs which don't support batching, use a smaller socket buffer size.
54#define SOCKET_BUFFER_SIZE_NON_BATCHED (4 * 1024)
55
56#define SENSOR_REGISTRATIONS_BUF_SIZE 200
57
58namespace android {
59// ---------------------------------------------------------------------------
60class SensorInterface;
61using namespace SensorServiceUtil;
62
63class SensorService :
64        public BinderService<SensorService>,
65        public BnSensorServer,
66        protected Thread
67{
68    // nested class/struct for internal use
69    class SensorEventConnection;
70    class SensorDirectConnection;
71
72public:
73    void cleanupConnection(SensorEventConnection* connection);
74    void cleanupConnection(SensorDirectConnection* c);
75
76    status_t enable(const sp<SensorEventConnection>& connection, int handle,
77                    nsecs_t samplingPeriodNs,  nsecs_t maxBatchReportLatencyNs, int reservedFlags,
78                    const String16& opPackageName);
79
80    status_t disable(const sp<SensorEventConnection>& connection, int handle);
81
82    status_t setEventRate(const sp<SensorEventConnection>& connection, int handle, nsecs_t ns,
83                          const String16& opPackageName);
84
85    status_t flushSensor(const sp<SensorEventConnection>& connection,
86                         const String16& opPackageName);
87
88private:
89    friend class BinderService<SensorService>;
90
91    // nested class/struct for internal use
92    class SensorRecord;
93    class SensorEventAckReceiver;
94    class SensorRegistrationInfo;
95
96    enum Mode {
97       // The regular operating mode where any application can register/unregister/call flush on
98       // sensors.
99       NORMAL = 0,
100       // This mode is only used for testing purposes. Not all HALs support this mode. In this mode,
101       // the HAL ignores the sensor data provided by physical sensors and accepts the data that is
102       // injected from the SensorService as if it were the real sensor data. This mode is primarily
103       // used for testing various algorithms like vendor provided SensorFusion, Step Counter and
104       // Step Detector etc. Typically in this mode, there will be a client (a
105       // SensorEventConnection) which will be injecting sensor data into the HAL. Normal apps can
106       // unregister and register for any sensor that supports injection. Registering to sensors
107       // that do not support injection will give an error.  TODO(aakella) : Allow exactly one
108       // client to inject sensor data at a time.
109       DATA_INJECTION = 1,
110       // This mode is used only for testing sensors. Each sensor can be tested in isolation with
111       // the required sampling_rate and maxReportLatency parameters without having to think about
112       // the data rates requested by other applications. End user devices are always expected to be
113       // in NORMAL mode. When this mode is first activated, all active sensors from all connections
114       // are disabled. Calling flush() will return an error. In this mode, only the requests from
115       // selected apps whose package names are whitelisted are allowed (typically CTS apps).  Only
116       // these apps can register/unregister/call flush() on sensors. If SensorService switches to
117       // NORMAL mode again, all sensors that were previously registered to are activated with the
118       // corresponding paramaters if the application hasn't unregistered for sensors in the mean
119       // time.  NOTE: Non whitelisted app whose sensors were previously deactivated may still
120       // receive events if a whitelisted app requests data from the same sensor.
121       RESTRICTED = 2
122
123      // State Transitions supported.
124      //     RESTRICTED   <---  NORMAL   ---> DATA_INJECTION
125      //                  --->           <---
126
127      // Shell commands to switch modes in SensorService.
128      // 1) Put SensorService in RESTRICTED mode with packageName .cts. If it is already in
129      // restricted mode it is treated as a NO_OP (and packageName is NOT changed).
130      //
131      //     $ adb shell dumpsys sensorservice restrict .cts.
132      //
133      // 2) Put SensorService in DATA_INJECTION mode with packageName .xts. If it is already in
134      // data_injection mode it is treated as a NO_OP (and packageName is NOT changed).
135      //
136      //     $ adb shell dumpsys sensorservice data_injection .xts.
137      //
138      // 3) Reset sensorservice back to NORMAL mode.
139      //     $ adb shell dumpsys sensorservice enable
140    };
141
142    static const char* WAKE_LOCK_NAME;
143    static char const* getServiceName() ANDROID_API { return "sensorservice"; }
144    SensorService() ANDROID_API;
145    virtual ~SensorService();
146
147    virtual void onFirstRef();
148
149    // Thread interface
150    virtual bool threadLoop();
151
152    // ISensorServer interface
153    virtual Vector<Sensor> getSensorList(const String16& opPackageName);
154    virtual Vector<Sensor> getDynamicSensorList(const String16& opPackageName);
155    virtual sp<ISensorEventConnection> createSensorEventConnection(
156            const String8& packageName,
157            int requestedMode, const String16& opPackageName);
158    virtual int isDataInjectionEnabled();
159    virtual sp<ISensorEventConnection> createSensorDirectConnection(const String16& opPackageName,
160            uint32_t size, int32_t type, int32_t format, const native_handle *resource);
161    virtual status_t dump(int fd, const Vector<String16>& args);
162
163    String8 getSensorName(int handle) const;
164    bool isVirtualSensor(int handle) const;
165    sp<SensorInterface> getSensorInterfaceFromHandle(int handle) const;
166    bool isWakeUpSensor(int type) const;
167    void recordLastValueLocked(sensors_event_t const* buffer, size_t count);
168    static void sortEventBuffer(sensors_event_t* buffer, size_t count);
169    const Sensor& registerSensor(SensorInterface* sensor,
170                                 bool isDebug = false, bool isVirtual = false);
171    const Sensor& registerVirtualSensor(SensorInterface* sensor, bool isDebug = false);
172    const Sensor& registerDynamicSensorLocked(SensorInterface* sensor, bool isDebug = false);
173    bool unregisterDynamicSensorLocked(int handle);
174    status_t cleanupWithoutDisable(const sp<SensorEventConnection>& connection, int handle);
175    status_t cleanupWithoutDisableLocked(const sp<SensorEventConnection>& connection, int handle);
176    void cleanupAutoDisabledSensorLocked(const sp<SensorEventConnection>& connection,
177            sensors_event_t const* buffer, const int count);
178    static bool canAccessSensor(const Sensor& sensor, const char* operation,
179            const String16& opPackageName);
180    // SensorService acquires a partial wakelock for delivering events from wake up sensors. This
181    // method checks whether all the events from these wake up sensors have been delivered to the
182    // corresponding applications, if yes the wakelock is released.
183    void checkWakeLockState();
184    void checkWakeLockStateLocked();
185    bool isWakeLockAcquired();
186    bool isWakeUpSensorEvent(const sensors_event_t& event) const;
187
188    sp<Looper> getLooper() const;
189
190    // Reset mWakeLockRefCounts for all SensorEventConnections to zero. This may happen if
191    // SensorService did not receive any acknowledgements from apps which have registered for
192    // wake_up sensors.
193    void resetAllWakeLockRefCounts();
194
195    // Acquire or release wake_lock. If wake_lock is acquired, set the timeout in the looper to 5
196    // seconds and wake the looper.
197    void setWakeLockAcquiredLocked(bool acquire);
198
199    // Send events from the event cache for this particular connection.
200    void sendEventsFromCache(const sp<SensorEventConnection>& connection);
201
202    // Promote all weak referecences in mActiveConnections vector to strong references and add them
203    // to the output vector.
204    void populateActiveConnections( SortedVector< sp<SensorEventConnection> >* activeConnections);
205
206    // If SensorService is operating in RESTRICTED mode, only select whitelisted packages are
207    // allowed to register for or call flush on sensors. Typically only cts test packages are
208    // allowed.
209    bool isWhiteListedPackage(const String8& packageName);
210    bool isOperationRestricted(const String16& opPackageName);
211
212    // Reset the state of SensorService to NORMAL mode.
213    status_t resetToNormalMode();
214    status_t resetToNormalModeLocked();
215
216    // Transforms the UUIDs for all the sensors into proper IDs.
217    void makeUuidsIntoIdsForSensorList(Vector<Sensor> &sensorList) const;
218    // Gets the appropriate ID from the given UUID.
219    int32_t getIdFromUuid(const Sensor::uuid_t &uuid) const;
220    // Either read from storage or create a new one.
221    static bool initializeHmacKey();
222
223    // Enable SCHED_FIFO priority for thread
224    void enableSchedFifoMode();
225
226    static uint8_t sHmacGlobalKey[128];
227    static bool sHmacGlobalKeyIsValid;
228
229    SensorList mSensors;
230    status_t mInitCheck;
231
232    // Socket buffersize used to initialize BitTube. This size depends on whether batching is
233    // supported or not.
234    uint32_t mSocketBufferSize;
235    sp<Looper> mLooper;
236    sp<SensorEventAckReceiver> mAckReceiver;
237
238    // protected by mLock
239    mutable Mutex mLock;
240    DefaultKeyedVector<int, SensorRecord*> mActiveSensors;
241    std::unordered_set<int> mActiveVirtualSensors;
242    SortedVector< wp<SensorEventConnection> > mActiveConnections;
243    bool mWakeLockAcquired;
244    sensors_event_t *mSensorEventBuffer, *mSensorEventScratch;
245    wp<const SensorEventConnection> * mMapFlushEventsToConnections;
246    std::unordered_map<int, RecentEventLogger*> mRecentEvent;
247    SortedVector< wp<SensorDirectConnection> > mDirectConnections;
248    Mode mCurrentOperatingMode;
249
250    // This packagaName is set when SensorService is in RESTRICTED or DATA_INJECTION mode. Only
251    // applications with this packageName are allowed to activate/deactivate or call flush on
252    // sensors. To run CTS this is can be set to ".cts." and only CTS tests will get access to
253    // sensors.
254    String8 mWhiteListedPackage;
255
256    int mNextSensorRegIndex;
257    Vector<SensorRegistrationInfo> mLastNSensorRegistrations;
258};
259
260} // namespace android
261#endif // ANDROID_SENSOR_SERVICE_H
262