Import goldfish HAL sources from devices/generic/goldfish

We import all code here so we can customize and keep in sync with what
we do on the host side more easily.

android/camera/EmulatedCameraHotplugThread.h

@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2013 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 HW_EMULATOR_CAMERA_EMULATED_CAMERA_HOTPLUG_H
+#define HW_EMULATOR_CAMERA_EMULATED_CAMERA_HOTPLUG_H
+
+/**
+ * This class emulates hotplug events by inotifying on a file, specific
+ * to a camera ID. When the file changes between 1/0 the hotplug
+ * status goes between PRESENT and NOT_PRESENT.
+ *
+ * Refer to FAKE_HOTPLUG_FILE in EmulatedCameraHotplugThread.cpp
+ */
+
+#include "EmulatedCamera2.h"
+#include <utils/String8.h>
+#include <utils/Vector.h>
+
+namespace android {
+class EmulatedCameraHotplugThread : public Thread {
+  public:
+    EmulatedCameraHotplugThread(const int* cameraIdArray, size_t size);
+    ~EmulatedCameraHotplugThread();
+
+    virtual void requestExit();
+    virtual status_t requestExitAndWait();
+
+  private:
+
+
+    virtual status_t readyToRun();
+    virtual bool threadLoop();
+
+    struct SubscriberInfo {
+        int CameraID;
+        int WatchID;
+    };
+
+    bool addWatch(int cameraId);
+    bool removeWatch(int cameraId);
+    SubscriberInfo* getSubscriberInfo(int cameraId);
+
+    int getCameraId(String8 filePath) const;
+    int getCameraId(int wd) const;
+
+    String8 getFilePath(int cameraId) const;
+    int readFile(String8 filePath) const;
+
+    bool createFileIfNotExists(int cameraId) const;
+
+    int mInotifyFd;
+    Vector<int> mSubscribedCameraIds;
+    Vector<SubscriberInfo> mSubscribers;
+
+    // variables above are unguarded:
+    // -- accessed in thread loop or in constructor only
+
+    Mutex mMutex;
+
+    bool mRunning;          // guarding only when it's important
+};
+} // namespace android
+
+#endif