2 * Copyright (C) 2010 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 #ifndef ANDROID_SENSOR_SERVICE_H
18 #define ANDROID_SENSOR_SERVICE_H
20 #include "SensorList.h"
21 #include "RecentEventLogger.h"
23 #include <binder/BinderService.h>
24 #include <cutils/compiler.h>
25 #include <gui/ISensorServer.h>
26 #include <gui/ISensorEventConnection.h>
27 #include <gui/Sensor.h>
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>
38 #include <sys/types.h>
39 #include <unordered_map>
40 #include <unordered_set>
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"
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
56 #define SENSOR_REGISTRATIONS_BUF_SIZE 200
59 // ---------------------------------------------------------------------------
60 class SensorInterface;
61 using namespace SensorServiceUtil;
64 public BinderService<SensorService>,
65 public BnSensorServer,
68 // nested class/struct for internal use
69 class SensorEventConnection;
72 void cleanupConnection(SensorEventConnection* connection);
74 status_t enable(const sp<SensorEventConnection>& connection, int handle,
75 nsecs_t samplingPeriodNs, nsecs_t maxBatchReportLatencyNs, int reservedFlags,
76 const String16& opPackageName);
78 status_t disable(const sp<SensorEventConnection>& connection, int handle);
80 status_t setEventRate(const sp<SensorEventConnection>& connection, int handle, nsecs_t ns,
81 const String16& opPackageName);
83 status_t flushSensor(const sp<SensorEventConnection>& connection,
84 const String16& opPackageName);
87 friend class BinderService<SensorService>;
89 // nested class/struct for internal use
91 class SensorEventAckReceiver;
92 struct SensorRegistrationInfo;
95 // The regular operating mode where any application can register/unregister/call flush on
98 // This mode is only used for testing purposes. Not all HALs support this mode. In this mode,
99 // the HAL ignores the sensor data provided by physical sensors and accepts the data that is
100 // injected from the SensorService as if it were the real sensor data. This mode is primarily
101 // used for testing various algorithms like vendor provided SensorFusion, Step Counter and
102 // Step Detector etc. Typically in this mode, there will be a client (a
103 // SensorEventConnection) which will be injecting sensor data into the HAL. Normal apps can
104 // unregister and register for any sensor that supports injection. Registering to sensors
105 // that do not support injection will give an error. TODO(aakella) : Allow exactly one
106 // client to inject sensor data at a time.
108 // This mode is used only for testing sensors. Each sensor can be tested in isolation with
109 // the required sampling_rate and maxReportLatency parameters without having to think about
110 // the data rates requested by other applications. End user devices are always expected to be
111 // in NORMAL mode. When this mode is first activated, all active sensors from all connections
112 // are disabled. Calling flush() will return an error. In this mode, only the requests from
113 // selected apps whose package names are whitelisted are allowed (typically CTS apps). Only
114 // these apps can register/unregister/call flush() on sensors. If SensorService switches to
115 // NORMAL mode again, all sensors that were previously registered to are activated with the
116 // corresponding paramaters if the application hasn't unregistered for sensors in the mean
117 // time. NOTE: Non whitelisted app whose sensors were previously deactivated may still
118 // receive events if a whitelisted app requests data from the same sensor.
121 // State Transitions supported.
122 // RESTRICTED <--- NORMAL ---> DATA_INJECTION
125 // Shell commands to switch modes in SensorService.
126 // 1) Put SensorService in RESTRICTED mode with packageName .cts. If it is already in
127 // restricted mode it is treated as a NO_OP (and packageName is NOT changed).
129 // $ adb shell dumpsys sensorservice restrict .cts.
131 // 2) Put SensorService in DATA_INJECTION mode with packageName .xts. If it is already in
132 // data_injection mode it is treated as a NO_OP (and packageName is NOT changed).
134 // $ adb shell dumpsys sensorservice data_injection .xts.
136 // 3) Reset sensorservice back to NORMAL mode.
137 // $ adb shell dumpsys sensorservice enable
140 static const char* WAKE_LOCK_NAME;
141 static char const* getServiceName() ANDROID_API { return "sensorservice"; }
142 SensorService() ANDROID_API;
143 virtual ~SensorService();
145 virtual void onFirstRef();
148 virtual bool threadLoop();
150 // ISensorServer interface
151 virtual Vector<Sensor> getSensorList(const String16& opPackageName);
152 virtual Vector<Sensor> getDynamicSensorList(const String16& opPackageName);
153 virtual sp<ISensorEventConnection> createSensorEventConnection(
154 const String8& packageName,
155 int requestedMode, const String16& opPackageName);
156 virtual int isDataInjectionEnabled();
157 virtual status_t dump(int fd, const Vector<String16>& args);
159 String8 getSensorName(int handle) const;
160 bool isVirtualSensor(int handle) const;
161 sp<SensorInterface> getSensorInterfaceFromHandle(int handle) const;
162 bool isWakeUpSensor(int type) const;
163 void recordLastValueLocked(sensors_event_t const* buffer, size_t count);
164 static void sortEventBuffer(sensors_event_t* buffer, size_t count);
165 const Sensor& registerSensor(SensorInterface* sensor,
166 bool isDebug = false, bool isVirtual = false);
167 const Sensor& registerVirtualSensor(SensorInterface* sensor, bool isDebug = false);
168 const Sensor& registerDynamicSensorLocked(SensorInterface* sensor, bool isDebug = false);
169 bool unregisterDynamicSensorLocked(int handle);
170 status_t cleanupWithoutDisable(const sp<SensorEventConnection>& connection, int handle);
171 status_t cleanupWithoutDisableLocked(const sp<SensorEventConnection>& connection, int handle);
172 void cleanupAutoDisabledSensorLocked(const sp<SensorEventConnection>& connection,
173 sensors_event_t const* buffer, const int count);
174 static bool canAccessSensor(const Sensor& sensor, const char* operation,
175 const String16& opPackageName);
176 // SensorService acquires a partial wakelock for delivering events from wake up sensors. This
177 // method checks whether all the events from these wake up sensors have been delivered to the
178 // corresponding applications, if yes the wakelock is released.
179 void checkWakeLockState();
180 void checkWakeLockStateLocked();
181 bool isWakeLockAcquired();
182 bool isWakeUpSensorEvent(const sensors_event_t& event) const;
184 sp<Looper> getLooper() const;
186 // Reset mWakeLockRefCounts for all SensorEventConnections to zero. This may happen if
187 // SensorService did not receive any acknowledgements from apps which have registered for
189 void resetAllWakeLockRefCounts();
191 // Acquire or release wake_lock. If wake_lock is acquired, set the timeout in the looper to 5
192 // seconds and wake the looper.
193 void setWakeLockAcquiredLocked(bool acquire);
195 // Send events from the event cache for this particular connection.
196 void sendEventsFromCache(const sp<SensorEventConnection>& connection);
198 // Promote all weak referecences in mActiveConnections vector to strong references and add them
199 // to the output vector.
200 void populateActiveConnections( SortedVector< sp<SensorEventConnection> >* activeConnections);
202 // If SensorService is operating in RESTRICTED mode, only select whitelisted packages are
203 // allowed to register for or call flush on sensors. Typically only cts test packages are
205 bool isWhiteListedPackage(const String8& packageName);
207 // Reset the state of SensorService to NORMAL mode.
208 status_t resetToNormalMode();
209 status_t resetToNormalModeLocked();
211 // Transforms the UUIDs for all the sensors into proper IDs.
212 void makeUuidsIntoIdsForSensorList(Vector<Sensor> &sensorList) const;
213 // Gets the appropriate ID from the given UUID.
214 int32_t getIdFromUuid(const Sensor::uuid_t &uuid) const;
215 // Either read from storage or create a new one.
216 static bool initializeHmacKey();
218 // Enable SCHED_FIFO priority for thread
219 void enableSchedFifoMode();
221 static uint8_t sHmacGlobalKey[128];
222 static bool sHmacGlobalKeyIsValid;
227 // Socket buffersize used to initialize BitTube. This size depends on whether batching is
229 uint32_t mSocketBufferSize;
231 sp<SensorEventAckReceiver> mAckReceiver;
233 // protected by mLock
235 DefaultKeyedVector<int, SensorRecord*> mActiveSensors;
236 std::unordered_set<int> mActiveVirtualSensors;
237 SortedVector< wp<SensorEventConnection> > mActiveConnections;
238 bool mWakeLockAcquired;
239 sensors_event_t *mSensorEventBuffer, *mSensorEventScratch;
240 wp<const SensorEventConnection> * mMapFlushEventsToConnections;
241 std::unordered_map<int, RecentEventLogger*> mRecentEvent;
242 Mode mCurrentOperatingMode;
244 // This packagaName is set when SensorService is in RESTRICTED or DATA_INJECTION mode. Only
245 // applications with this packageName are allowed to activate/deactivate or call flush on
246 // sensors. To run CTS this is can be set to ".cts." and only CTS tests will get access to
248 String8 mWhiteListedPackage;
250 int mNextSensorRegIndex;
251 Vector<SensorRegistrationInfo> mLastNSensorRegistrations;
254 } // namespace android
255 #endif // ANDROID_SENSOR_SERVICE_H