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+/************************************************************************************
+Filename    :   OVR_Linux_HIDDevice.h
+Content     :   Linux HID device implementation.
+Created     :   June 13, 2013
+Authors     :   Brant Lewis
+
+Copyright   :   Copyright 2013 Oculus VR, Inc. All Rights reserved.
+
+Use of this software is subject to the terms of the Oculus license
+agreement provided at the time of installation or download, or which
+otherwise accompanies this software in either electronic or hard copy form.
+
+*************************************************************************************/
+
+#ifndef OVR_LINUX_HIDDevice_h
+#define OVR_LINUX_HIDDevice_h
+
+#include "OVR_HIDDevice.h"
+#include "OVR_Linux_DeviceManager.h"
+#include <libudev.h>
+
+namespace OVR { namespace Linux {
+
+class HIDDeviceManager;
+
+//-------------------------------------------------------------------------------------
+// ***** Linux HIDDevice
+
+class HIDDevice : public OVR::HIDDevice, public DeviceManagerThread::Notifier
+{
+private:
+    friend class HIDDeviceManager;
+
+public:
+    HIDDevice(HIDDeviceManager* manager);
+
+    // This is a minimal constructor used during enumeration for us to pass
+    // a HIDDevice to the visit function (so that it can query feature reports).
+    HIDDevice(HIDDeviceManager* manager, int device_handle);
+    
+    virtual ~HIDDevice();
+
+    bool HIDInitialize(const String& path);
+    void HIDShutdown();
+    
+    virtual bool SetFeatureReport(UByte* data, UInt32 length);
+	virtual bool GetFeatureReport(UByte* data, UInt32 length);
+
+    // DeviceManagerThread::Notifier
+    void OnEvent(int i, int fd);
+    UInt64 OnTicks(UInt64 ticksMks);
+
+    bool OnDeviceNotification(MessageType messageType,
+                              HIDDeviceDesc* device_info,
+                              bool* error);
+
+private:
+    bool initInfo();
+    bool openDevice(const char* dev_path);
+    void closeDevice(bool wasUnplugged);
+    void closeDeviceOnIOError();
+    bool setupDevicePluggedInNotification();
+
+    bool                    InMinimalMode;
+    HIDDeviceManager*       HIDManager;
+    int                     DeviceHandle;     // file handle to the device
+    HIDDeviceDesc           DevDesc;
+    
+    enum { ReadBufferSize = 96 };
+    UByte                   ReadBuffer[ReadBufferSize];
+
+    UInt16                  InputReportBufferLength;
+    UInt16                  OutputReportBufferLength;
+    UInt16                  FeatureReportBufferLength;
+};
+
+
+//-------------------------------------------------------------------------------------
+// ***** Linux HIDDeviceManager
+
+class HIDDeviceManager : public OVR::HIDDeviceManager, public DeviceManagerThread::Notifier
+{
+	friend class HIDDevice;
+
+public:
+    HIDDeviceManager(Linux::DeviceManager* Manager);
+    virtual ~HIDDeviceManager();
+
+    virtual bool Initialize();
+    virtual void Shutdown();
+
+    virtual bool Enumerate(HIDEnumerateVisitor* enumVisitor);
+    virtual OVR::HIDDevice* Open(const String& path);
+
+    static HIDDeviceManager* CreateInternal(DeviceManager* manager);
+
+    void OnEvent(int i, int fd);
+    
+private:
+    bool initializeManager();
+    bool initVendorProductVersion(udev_device* device, HIDDeviceDesc* pDevDesc);
+    bool getPath(udev_device* device, String* pPath);
+    bool getIntProperty(udev_device* device, const char* key, int32_t* pResult);
+    bool getStringProperty(udev_device* device,
+                           const char* propertyName,
+                           OVR::String* pResult);
+    bool getFullDesc(udev_device* device, HIDDeviceDesc* desc);
+    bool GetDescriptorFromPath(const char* dev_path, HIDDeviceDesc* desc);
+    
+    bool AddNotificationDevice(HIDDevice* device);
+    bool RemoveNotificationDevice(HIDDevice* device);
+    
+    DeviceManager*           DevManager;
+
+    udev*                    UdevInstance;     // a handle to the udev library instance
+    udev_monitor*            HIDMonitor;
+    int                      HIDMonHandle;     // the udev_monitor file handle
+
+    Array<HIDDevice*>        NotificationDevices;
+};
+
+}} // namespace OVR::Linux
+
+#endif // OVR_Linux_HIDDevice_h