1 /*
2  * Copyright (C) 2015 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 #ifndef HOTPLUG_THREAD_H_
17 #define HOTPLUG_THREAD_H_
18 
19 #include <utils/Thread.h>
20 #include "CameraHAL.h"
21 
22 namespace usb_camera_hal {
23 /**
24  * Thread for managing usb camera hotplug. It does below:
25  * 1. Monitor camera hotplug status, and notify the status changes by calling
26  *    module callback methods.
27  * 2. When camera is plugged, create camera device instance, initialize the camera
28  *    static info. When camera is unplugged, destroy the camera device instance and
29  *    static metadata. As an optimization option, the camera device instance (including
30  *    the static info) could be cached when the same camera plugged/unplugged multiple
31  *    times.
32  */
33 
34 class CameraHAL;
35 
36 class HotplugThread : public android::Thread {
37 
38     public:
39         explicit HotplugThread(CameraHAL *hal);
40         ~HotplugThread();
41 
42         // Override below two methods for proper cleanup.
43         virtual bool threadLoop();
44         virtual void requestExit();
45 
46     private:
47         CameraHAL *mModule;
48 };
49 
50 } // namespace usb_camera_hal
51 
52 #endif // HOTPLUG_THREAD_H_
53