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1 /*
2  * Copyright (C) 2017 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 A_SENSOR_EVENT_QUEUE_H_
18 
19 #define A_SENSOR_EVENT_QUEUE_H_
20 
21 #include <aidl/android/frameworks/sensorservice/BnEventQueueCallback.h>
22 #include <aidl/android/frameworks/sensorservice/IEventQueue.h>
23 #include <aidl/sensors/convert.h>
24 #include <android-base/macros.h>
25 #include <android/binder_auto_utils.h>
26 #include <android/looper.h>
27 #include <android/sensor.h>
28 #include <utils/Mutex.h>
29 #include <utils/RefBase.h>
30 
31 #include <atomic>
32 
33 struct ALooper;
34 
35 struct ASensorEventQueue : public aidl::android::frameworks::sensorservice::BnEventQueueCallback {
36     using Event = aidl::android::hardware::sensors::Event;
37     using IEventQueue = aidl::android::frameworks::sensorservice::IEventQueue;
38 
39     ASensorEventQueue(
40             ALooper *looper,
41             ALooper_callbackFunc callback,
42             void *data);
43 
44     ndk::ScopedAStatus onEvent(const Event& event) override;
45 
46     void setImpl(const std::shared_ptr<IEventQueue>& queueImpl);
47 
48     int registerSensor(
49             ASensorRef sensor,
50             int32_t samplingPeriodUs,
51             int64_t maxBatchReportLatencyUs);
52 
53     int enableSensor(ASensorRef sensor);
54     int disableSensor(ASensorRef sensor);
55 
56     int setEventRate(ASensorRef sensor, int32_t samplingPeriodUs);
57 
58     int requestAdditionalInfoEvents(bool enable);
59 
60     ssize_t getEvents(ASensorEvent *events, size_t count);
61     int hasEvents() const;
62 
63     void dispatchCallback();
64 
65     void invalidate();
66 
67 private:
68     ALooper *mLooper;
69     ALooper_callbackFunc mCallback;
70     void *mData;
71     std::shared_ptr<IEventQueue> mQueueImpl;
72 
73     android::Mutex mLock;
74     std::vector<sensors_event_t> mQueue;
75 
76     std::atomic_bool mRequestAdditionalInfo;
77     android::Mutex mValidLock;
78     bool mValid;
79 
80     DISALLOW_COPY_AND_ASSIGN(ASensorEventQueue);
81 };
82 
83 #endif  // A_SENSOR_EVENT_QUEUE_H_
84 
85