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_EVENT_CONNECTION_H
18 #define ANDROID_SENSOR_EVENT_CONNECTION_H
19 
20 #include <stdint.h>
21 #include <sys/types.h>
22 #include <unordered_map>
23 
24 #include <utils/Vector.h>
25 #include <utils/SortedVector.h>
26 #include <utils/KeyedVector.h>
27 #include <utils/threads.h>
28 #include <utils/AndroidThreads.h>
29 #include <utils/RefBase.h>
30 #include <utils/Looper.h>
31 #include <utils/String8.h>
32 
33 #include <binder/BinderService.h>
34 
35 #include <sensor/Sensor.h>
36 #include <sensor/BitTube.h>
37 #include <sensor/ISensorServer.h>
38 #include <sensor/ISensorEventConnection.h>
39 
40 #include "SensorService.h"
41 
42 namespace android {
43 
44 class SensorService;
45 
46 class SensorService::SensorEventConnection:
47     public BnSensorEventConnection, public LooperCallback {
48 
49     friend class SensorService;
50 
51 public:
52     SensorEventConnection(const sp<SensorService>& service, uid_t uid, String8 packageName,
53                           bool isDataInjectionMode, const String16& opPackageName,
54                           bool hasSensorAccess);
55 
56     status_t sendEvents(sensors_event_t const* buffer, size_t count, sensors_event_t* scratch,
57                         wp<const SensorEventConnection> const * mapFlushEventsToConnections = nullptr);
58     bool hasSensor(int32_t handle) const;
59     bool hasAnySensor() const;
60     bool hasOneShotSensors() const;
61     bool addSensor(int32_t handle);
62     bool removeSensor(int32_t handle);
63     void setFirstFlushPending(int32_t handle, bool value);
64     void dump(String8& result);
65     bool needsWakeLock();
66     void resetWakeLockRefCount();
67     String8 getPackageName() const;
68 
getUid()69     uid_t getUid() const { return mUid; }
70 
71     void setSensorAccess(const bool hasAccess);
72 
73 private:
74     virtual ~SensorEventConnection();
75     virtual void onFirstRef();
76     virtual sp<BitTube> getSensorChannel() const;
77     virtual status_t enableDisable(int handle, bool enabled, nsecs_t samplingPeriodNs,
78                                    nsecs_t maxBatchReportLatencyNs, int reservedFlags);
79     virtual status_t setEventRate(int handle, nsecs_t samplingPeriodNs);
80     virtual status_t flush();
81     virtual int32_t configureChannel(int handle, int rateLevel);
82     virtual void destroy();
83 
84     // Count the number of flush complete events which are about to be dropped in the buffer.
85     // Increment mPendingFlushEventsToSend in mSensorInfo. These flush complete events will be sent
86     // separately before the next batch of events.
87     void countFlushCompleteEventsLocked(sensors_event_t const* scratch, int numEventsDropped);
88 
89     // Check if there are any wake up events in the buffer. If yes, return the index of the first
90     // wake_up sensor event in the buffer else return -1.  This wake_up sensor event will have the
91     // flag WAKE_UP_SENSOR_EVENT_NEEDS_ACK set. Exactly one event per packet will have the wake_up
92     // flag set. SOCK_SEQPACKET ensures that either the entire packet is read or dropped.
93     int findWakeUpSensorEventLocked(sensors_event_t const* scratch, int count);
94 
95     // Send pending flush_complete events. There may have been flush_complete_events that are
96     // dropped which need to be sent separately before other events. On older HALs (1_0) this method
97     // emulates the behavior of flush().
98     void sendPendingFlushEventsLocked();
99 
100     // Writes events from mEventCache to the socket.
101     void writeToSocketFromCache();
102 
103     // Compute the approximate cache size from the FIFO sizes of various sensors registered for this
104     // connection. Wake up and non-wake up sensors have separate FIFOs but FIFO may be shared
105     // amongst wake-up sensors and non-wake up sensors.
106     int computeMaxCacheSizeLocked() const;
107 
108     // When more sensors register, the maximum cache size desired may change.  Compute max cache
109     // size, reallocate memory and copy over events from the older cache.
110     void reAllocateCacheLocked(sensors_event_t const* scratch, int count);
111 
112     // Add the events to the cache. If the cache would be exceeded, drop events at the beginning of
113     // the cache.
114     void appendEventsToCacheLocked(sensors_event_t const* events, int count);
115 
116     // LooperCallback method. If there is data to read on this fd, it is an ack from the app that it
117     // has read events from a wake up sensor, decrement mWakeLockRefCount.  If this fd is available
118     // for writing send the data from the cache.
119     virtual int handleEvent(int fd, int events, void* data);
120 
121     // Increment mPendingFlushEventsToSend for the given sensor handle.
122     void incrementPendingFlushCount(int32_t handle);
123 
124     // Add or remove the file descriptor associated with the BitTube to the looper. If mDead is set
125     // to true or there are no more sensors for this connection, the file descriptor is removed if
126     // it has been previously added to the Looper. Depending on the state of the connection FD may
127     // be added to the Looper. The flags to set are determined by the internal state of the
128     // connection. FDs are added to the looper when wake-up sensors are registered (to poll for
129     // acknowledgements) and when write fails on the socket when there are too many error and the
130     // other end hangs up or when this client unregisters for this connection.
131     void updateLooperRegistration(const sp<Looper>& looper); void
132             updateLooperRegistrationLocked(const sp<Looper>& looper);
133 
134     // Returns whether sensor access is available based on both the uid being active and sensor
135     // privacy not being enabled.
136     bool hasSensorAccess();
137 
138     // Call noteOp for the sensor if the sensor requires a permission
139     bool noteOpIfRequired(const sensors_event_t& event);
140 
141     sp<SensorService> const mService;
142     sp<BitTube> mChannel;
143     uid_t mUid;
144     mutable Mutex mConnectionLock;
145     // Number of events from wake up sensors which are still pending and haven't been delivered to
146     // the corresponding application. It is incremented by one unit for each write to the socket.
147     uint32_t mWakeLockRefCount;
148 
149     // If this flag is set to true, it means that the file descriptor associated with the BitTube
150     // has been added to the Looper in SensorService. This flag is typically set when this
151     // connection has wake-up sensors associated with it or when write has failed on this connection
152     // and we're storing some events in the cache.
153     bool mHasLooperCallbacks;
154     // If there are any errors associated with the Looper this flag is set to true and
155     // mWakeLockRefCount is reset to zero. needsWakeLock method will always return false, if this
156     // flag is set.
157     bool mDead;
158 
159     bool mDataInjectionMode;
160     struct FlushInfo {
161         // The number of flush complete events dropped for this sensor is stored here.  They are
162         // sent separately before the next batch of events.
163         int mPendingFlushEventsToSend;
164 
165         // Every activate is preceded by a flush. Only after the first flush complete is received,
166         // the events for the sensor are sent on that *connection*.
167         bool mFirstFlushPending;
168 
FlushInfoFlushInfo169         FlushInfo() : mPendingFlushEventsToSend(0), mFirstFlushPending(false) {}
170     };
171     // protected by SensorService::mLock. Key for this vector is the sensor handle.
172     KeyedVector<int, FlushInfo> mSensorInfo;
173 
174     sensors_event_t *mEventCache;
175     int mCacheSize, mMaxCacheSize;
176     int64_t mTimeOfLastEventDrop;
177     int mEventsDropped;
178     String8 mPackageName;
179     const String16 mOpPackageName;
180 #if DEBUG_CONNECTIONS
181     int mEventsReceived, mEventsSent, mEventsSentFromCache;
182     int mTotalAcksNeeded, mTotalAcksReceived;
183 #endif
184 
185     mutable Mutex mDestroyLock;
186     bool mDestroyed;
187     bool mHasSensorAccess;
188 
189     // Store a mapping of sensor handles to required AppOp for a sensor. This map only contains a
190     // valid mapping for sensors that require a permission in order to reduce the lookup time.
191     std::unordered_map<int32_t, int32_t> mHandleToAppOp;
192 };
193 
194 } // namepsace android
195 
196 #endif // ANDROID_SENSOR_EVENT_CONNECTION_H
197 
198