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diff --git a/modules/usbcamera/HotplugThread.h b/modules/usbcamera/HotplugThread.h
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+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef HOTPLUG_THREAD_H_
+#define HOTPLUG_THREAD_H_
+
+#include <utils/Thread.h>
+#include "CameraHAL.h"
+
+namespace usb_camera_hal {
+/**
+ * Thread for managing usb camera hotplug. It does below:
+ * 1. Monitor camera hotplug status, and notify the status changes by calling
+ *    module callback methods.
+ * 2. When camera is plugged, create camera device instance, initialize the camera
+ *    static info. When camera is unplugged, destroy the camera device instance and
+ *    static metadata. As an optimization option, the camera device instance (including
+ *    the static info) could be cached when the same camera plugged/unplugged multiple
+ *    times.
+ */
+
+class CameraHAL;
+
+class HotplugThread : public android::Thread {
+
+    public:
+        HotplugThread(CameraHAL *hal);
+        ~HotplugThread();
+
+        // Override below two methods for proper cleanup.
+        virtual bool threadLoop();
+        virtual void requestExit();
+
+    private:
+        CameraHAL *mModule;
+};
+
+} // namespace usb_camera_hal
+
+#endif // HOTPLUG_THREAD_H_