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/************************************************************************************
Filename : OVR_Win32_HIDDevice.h
Content : Win32 HID device implementation.
Created : February 22, 2013
Authors : Lee Cooper
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_Win32_HIDDevice_h
#define OVR_Win32_HIDDevice_h
#include "OVR_HIDDevice.h"
#include "OVR_Win32_DeviceManager.h"
#include <windows.h>
#include <setupapi.h>
//-------------------------------------------------------------------------------------
// Define needed "hidsdi.h" functionality to avoid requiring DDK installation.
// #include "hidsdi.h"
#ifndef _HIDSDI_H
#define _HIDSDI_H
#include <pshpack4.h>
#define HIDP_STATUS_SUCCESS (0x11 << 16)
struct HIDP_PREPARSED_DATA;
struct HIDD_ATTRIBUTES
{
ULONG Size; // = sizeof (struct _HIDD_ATTRIBUTES)
USHORT VendorID;
USHORT ProductID;
USHORT VersionNumber;
};
struct HIDP_CAPS
{
USHORT Usage;
USHORT UsagePage;
USHORT InputReportByteLength;
USHORT OutputReportByteLength;
USHORT FeatureReportByteLength;
USHORT Reserved[17];
USHORT NumberLinkCollectionNodes;
USHORT NumberInputButtonCaps;
USHORT NumberInputValueCaps;
USHORT NumberInputDataIndices;
USHORT NumberOutputButtonCaps;
USHORT NumberOutputValueCaps;
USHORT NumberOutputDataIndices;
USHORT NumberFeatureButtonCaps;
USHORT NumberFeatureValueCaps;
USHORT NumberFeatureDataIndices;
};
#include <poppack.h>
#endif
namespace OVR { namespace Win32 {
class HIDDeviceManager;
class DeviceManager;
//-------------------------------------------------------------------------------------
// ***** Win32 HIDDevice
class HIDDevice : public OVR::HIDDevice, public DeviceManagerThread::Notifier
{
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, HANDLE device);
~HIDDevice();
bool HIDInitialize(const String& path);
void HIDShutdown();
// OVR::HIDDevice
bool SetFeatureReport(UByte* data, UInt32 length);
bool GetFeatureReport(UByte* data, UInt32 length);
// DeviceManagerThread::Notifier
void OnOverlappedEvent(HANDLE hevent);
UInt64 OnTicks(UInt64 ticksMks);
bool OnDeviceMessage(DeviceMessageType messageType, const String& devicePath, bool* error);
private:
bool openDevice();
bool initInfo();
bool initializeRead();
bool processReadResult();
void closeDevice();
void closeDeviceOnIOError();
bool inMinimalMode;
HIDDeviceManager* HIDManager;
HANDLE Device;
HIDDeviceDesc DevDesc;
OVERLAPPED ReadOverlapped;
bool ReadRequested;
enum { ReadBufferSize = 96 };
UByte ReadBuffer[ReadBufferSize];
UInt16 InputReportBufferLength;
UInt16 OutputReportBufferLength;
UInt16 FeatureReportBufferLength;
};
//-------------------------------------------------------------------------------------
// ***** Win32 HIDDeviceManager
class HIDDeviceManager : public OVR::HIDDeviceManager
{
friend class HIDDevice;
public:
HIDDeviceManager(DeviceManager* manager);
virtual ~HIDDeviceManager();
virtual bool Initialize();
virtual void Shutdown();
virtual bool Enumerate(HIDEnumerateVisitor* enumVisitor);
virtual OVR::HIDDevice* Open(const String& path);
// Fills HIDDeviceDesc by using the path.
// Returns 'true' if successful, 'false' otherwise.
bool GetHIDDeviceDesc(const String& path, HIDDeviceDesc* pdevDesc) const;
GUID GetHIDGuid() { return HidGuid; }
static HIDDeviceManager* CreateInternal(DeviceManager* manager);
private:
DeviceManager* Manager; // Back pointer can just be a raw pointer.
HMODULE hHidLib;
GUID HidGuid;
// Macros to declare and resolve needed functions from library.
#define OVR_DECLARE_HIDFUNC(func, rettype, args) \
typedef rettype (__stdcall *PFn_##func) args; \
PFn_##func func;
#define OVR_RESOLVE_HIDFUNC(func) \
func = (PFn_##func)::GetProcAddress(hHidLib, #func)
OVR_DECLARE_HIDFUNC(HidD_GetHidGuid, void, (GUID *hidGuid));
OVR_DECLARE_HIDFUNC(HidD_SetNumInputBuffers, BOOLEAN, (HANDLE hidDev, ULONG numberBuffers));
OVR_DECLARE_HIDFUNC(HidD_GetFeature, BOOLEAN, (HANDLE hidDev, PVOID buffer, ULONG bufferLength));
OVR_DECLARE_HIDFUNC(HidD_SetFeature, BOOLEAN, (HANDLE hidDev, PVOID buffer, ULONG bufferLength));
OVR_DECLARE_HIDFUNC(HidD_GetAttributes, BOOLEAN, (HANDLE hidDev, HIDD_ATTRIBUTES *attributes));
OVR_DECLARE_HIDFUNC(HidD_GetManufacturerString, BOOLEAN, (HANDLE hidDev, PVOID buffer, ULONG bufferLength));
OVR_DECLARE_HIDFUNC(HidD_GetProductString, BOOLEAN, (HANDLE hidDev, PVOID buffer, ULONG bufferLength));
OVR_DECLARE_HIDFUNC(HidD_GetSerialNumberString, BOOLEAN, (HANDLE hidDev, PVOID buffer, ULONG bufferLength));
OVR_DECLARE_HIDFUNC(HidD_GetPreparsedData, BOOLEAN, (HANDLE hidDev, HIDP_PREPARSED_DATA **preparsedData));
OVR_DECLARE_HIDFUNC(HidD_FreePreparsedData, BOOLEAN, (HIDP_PREPARSED_DATA *preparsedData));
OVR_DECLARE_HIDFUNC(HidP_GetCaps, NTSTATUS,(HIDP_PREPARSED_DATA *preparsedData, HIDP_CAPS* caps));
HANDLE CreateHIDFile(const char* path, bool exclusiveAccess = true) const
{
return ::CreateFileA(path, GENERIC_WRITE|GENERIC_READ,
(!exclusiveAccess) ? (FILE_SHARE_READ|FILE_SHARE_WRITE) : 0x0,
NULL, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, 0);
}
// Helper functions to fill in HIDDeviceDesc from open device handle.
bool initVendorProductVersion(HANDLE hidDev, HIDDeviceDesc* desc) const;
bool initUsage(HANDLE hidDev, HIDDeviceDesc* desc) const;
void initStrings(HANDLE hidDev, HIDDeviceDesc* desc) const;
bool getFullDesc(HANDLE hidDev, HIDDeviceDesc* desc) const;
};
}} // namespace OVR::Win32
#endif // OVR_Win32_HIDDevice_h
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