Added GC Steering Wheel emulation.

To set it up, change the Port 1 controller to "Steering Wheel" under the GameCube tab.  This will tell the game that you have a force feedback steering wheel connected.
In the Gamecube Pad Settings, change the Rumble Motor to "Constant".
Configure the controls:

Main Stick Left/Right = Steer Left/Right
Main Stick Up = Accelerate
Main Stick Down = Brake

Thanks to ulao for the device communications info.

Source/Core/Core/CMakeLists.txt

@@ -115,6 +115,7 @@ set(SRCS	Src/ActionReplay.cpp
 			Src/HW/SI_Device.cpp
 			Src/HW/SI_DeviceGBA.cpp
 			Src/HW/SI_DeviceGCController.cpp
+			Src/HW/SI_DeviceGCSteeringWheel.cpp
 			Src/HW/Sram.cpp
 			Src/HW/StreamADPCM.cpp
 			Src/HW/SystemTimers.cpp

Source/Core/Core/Core.vcxproj

@@ -301,6 +301,7 @@
     <ClCompile Include="Src\HW\SI_DeviceAMBaseboard.cpp" />
     <ClCompile Include="Src\HW\SI_DeviceGBA.cpp" />
     <ClCompile Include="Src\HW\SI_DeviceGCController.cpp" />
+    <ClCompile Include="Src\HW\SI_DeviceGCSteeringWheel.cpp" />
     <ClCompile Include="Src\HW\Sram.cpp" />
     <ClCompile Include="Src\HW\StreamADPCM.cpp" />
     <ClCompile Include="Src\HW\SystemTimers.cpp" />
@@ -503,6 +504,7 @@
     <ClInclude Include="Src\HW\SI_DeviceAMBaseboard.h" />
     <ClInclude Include="Src\HW\SI_DeviceGBA.h" />
     <ClInclude Include="Src\HW\SI_DeviceGCController.h" />
+    <ClInclude Include="Src\HW\SI_DeviceGCSteeringWheel.h" />
     <ClInclude Include="Src\HW\Sram.h" />
     <ClInclude Include="Src\HW\StreamADPCM.h" />
     <ClInclude Include="Src\HW\SystemTimers.h" />

Source/Core/Core/Core.vcxproj.filters

@@ -290,6 +290,9 @@
     <ClCompile Include="Src\HW\SI_DeviceGCController.cpp">
       <Filter>HW %28Flipper/Hollywood%29\SI - Serial Interface</Filter>
     </ClCompile>
+    <ClCompile Include="Src\HW\SI_DeviceGCSteeringWheel.cpp">
+      <Filter>HW %28Flipper/Hollywood%29\SI - Serial Interface</Filter>
+    </ClCompile>
     <ClCompile Include="Src\HW\VideoInterface.cpp">
       <Filter>HW %28Flipper/Hollywood%29\VI - Video Interface</Filter>
     </ClCompile>
@@ -814,6 +817,9 @@
     <ClInclude Include="Src\HW\SI_DeviceGCController.h">
       <Filter>HW %28Flipper/Hollywood%29\SI - Serial Interface</Filter>
     </ClInclude>
+    <ClInclude Include="Src\HW\SI_DeviceGCSteeringWheel.h">
+      <Filter>HW %28Flipper/Hollywood%29\SI - Serial Interface</Filter>
+    </ClInclude>
     <ClInclude Include="Src\HW\SI.h">
       <Filter>HW %28Flipper/Hollywood%29\SI - Serial Interface</Filter>
     </ClInclude>

Source/Core/Core/Src/HW/GCPad.cpp

@@ -101,7 +101,32 @@ void Rumble(u8 _numPAD, unsigned int _uType, unsigned int _uStrength)
 	{
 		// TODO: this has potential to not stop rumble if user is messing with GUI at the perfect time
 		// set rumble
-		((GCPad*)g_plugin.controllers[ _numPAD ])->SetOutput( 1 == _uType && _uStrength > 2 );
+		if (1 == _uType && _uStrength > 2)
+		{
+			((GCPad*)g_plugin.controllers[ _numPAD ])->SetOutput(255);
+		}
+	}
+}
+
+// __________________________________________________________________________________________________
+// Function: Motor
+// Purpose:  For devices with constant Force feedback
+// input:	 Type - 06 = Motor On, 04 = Motor Off
+//           Strength - 00 = Left Strong, 127 = Left Weak, 128 = Right Weak, 255 = Right Strong
+// output:   none
+//
+void Motor(u8 _numPAD, unsigned int _uType, unsigned int _uStrength)
+{
+	std::unique_lock<std::recursive_mutex> lk(g_plugin.controls_lock, std::try_to_lock);
+
+	if (lk.owns_lock())
+	{
+		// TODO: this has potential to not stop rumble if user is messing with GUI at the perfect time
+		// set rumble
+		if (_uType == 06)
+		{
+			((GCPad*)g_plugin.controllers[ _numPAD ])->SetOutput(_uStrength);
+		}
 	}
 }
 

Source/Core/Core/Src/HW/GCPad.h

@@ -32,6 +32,7 @@ InputPlugin *GetPlugin();
 
 void GetStatus(u8 _numPAD, SPADStatus* _pPADStatus);
 void Rumble(u8 _numPAD, unsigned int _uType, unsigned int _uStrength);
+void Motor(u8 _numPAD, unsigned int _uType, unsigned int _uStrength);
 
 bool GetMicButton(u8 pad);
 }

Source/Core/Core/Src/HW/GCPadEmu.cpp

@@ -130,10 +130,13 @@ void GCPad::GetInput(SPADStatus* const pad)
 	}
 }
 
-void GCPad::SetOutput(const bool on)
+void GCPad::SetOutput(const u8 on)
 {
 	// only rumble if window has focus or background input is enabled
-	m_rumble->controls[0]->control_ref->State(on && (Host_RendererHasFocus() || m_options[0].settings[0]->value));
+	if (Host_RendererHasFocus() || m_options[0].settings[0]->value)
+		m_rumble->controls[0]->control_ref->State((float)on / 255);
+	else
+		m_rumble->controls[0]->control_ref->State(0);
 }
 
 void GCPad::LoadDefaults(const ControllerInterface& ciface)

Source/Core/Core/Src/HW/GCPadEmu.h

@@ -28,7 +28,7 @@ public:
 
 	GCPad(const unsigned int index);
 	void GetInput(SPADStatus* const pad);
-	void SetOutput(const bool on);
+	void SetOutput(const u8 on);
 
 	bool GetMicButton() const;
 	

Source/Core/Core/Src/HW/SI_Device.cpp

@@ -17,6 +17,7 @@
 
 #include "SI_Device.h"
 #include "SI_DeviceGCController.h"
+#include "SI_DeviceGCSteeringWheel.h"
 #include "SI_DeviceGBA.h"
 #include "SI_DeviceAMBaseboard.h"
 
@@ -76,6 +77,10 @@ ISIDevice* SIDevice_Create(const SIDevices device, const int port_number)
 		return new CSIDevice_GCController(device, port_number);
 		break;
 
+	case SIDEVICE_GC_STEERING:
+		return new CSIDevice_GCSteeringWheel(device, port_number);
+		break;
+
 	case SIDEVICE_GC_TARUKONGA:
 		return new CSIDevice_TaruKonga(device, port_number);
 		break;

Source/Core/Core/Src/HW/SI_DeviceGCSteeringWheel.cpp

@@ -0,0 +1,314 @@
+// Copyright (C) 2003 Dolphin Project.
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, version 2.0.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License 2.0 for more details.
+
+// A copy of the GPL 2.0 should have been included with the program.
+// If not, see http://www.gnu.org/licenses/
+
+// Official SVN repository and contact information can be found at
+// http://code.google.com/p/dolphin-emu/
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "SI.h"
+#include "SI_Device.h"
+#include "SI_DeviceGCSteeringWheel.h"
+
+#include "EXI_Device.h"
+#include "EXI_DeviceMic.h"
+
+#include "GCPad.h"
+
+#include "../Movie.h"
+
+#include "../CoreTiming.h"
+#include "SystemTimers.h"
+#include "ProcessorInterface.h"
+#include "../Core.h"
+
+// --- standard gamecube controller ---
+CSIDevice_GCSteeringWheel::CSIDevice_GCSteeringWheel(SIDevices device, int _iDeviceNumber)
+	: ISIDevice(device, _iDeviceNumber)
+	, m_TButtonComboStart(0)
+	, m_TButtonCombo(0)
+	, m_LastButtonCombo(COMBO_NONE)
+{
+	memset(&m_Origin, 0, sizeof(SOrigin));
+	m_Origin.uCommand			= CMD_ORIGIN;
+	m_Origin.uOriginStickX		= 0x80; // center
+	m_Origin.uOriginStickY		= 0x80;
+	m_Origin.uSubStickStickX	= 0x80;
+	m_Origin.uSubStickStickY	= 0x80;
+	m_Origin.uTrigger_L			= 0x1F; // 0-30 is the lower deadzone
+	m_Origin.uTrigger_R			= 0x1F;
+
+	// Dunno if we need to do this, game/lib should set it?
+	m_Mode						= 0x03;
+}
+
+int CSIDevice_GCSteeringWheel::RunBuffer(u8* _pBuffer, int _iLength)
+{
+	// For debug logging only
+	ISIDevice::RunBuffer(_pBuffer, _iLength);
+
+	// Read the command
+	EBufferCommands command = static_cast<EBufferCommands>(_pBuffer[3]);
+
+	// Handle it
+	switch (command)
+	{
+	case CMD_RESET:
+		*(u32*)&_pBuffer[0] = SI_GC_STEERING;
+		break;
+
+	case CMD_ORIGIN:
+		{
+			INFO_LOG(SERIALINTERFACE, "PAD - Get Origin");
+			u8* pCalibration = reinterpret_cast<u8*>(&m_Origin);
+			for (int i = 0; i < (int)sizeof(SOrigin); i++)
+			{
+				_pBuffer[i ^ 3] = *pCalibration++;
+			}
+		}
+		break;
+
+	// Recalibrate (FiRES: i am not 100 percent sure about this)
+	case CMD_RECALIBRATE:
+		{
+			INFO_LOG(SERIALINTERFACE, "PAD - Recalibrate");
+			u8* pCalibration = reinterpret_cast<u8*>(&m_Origin);
+			for (int i = 0; i < (int)sizeof(SOrigin); i++)
+			{
+				_pBuffer[i ^ 3] = *pCalibration++;
+			}				
+		}
+		break;
+
+	// Seen in F-Zero GX
+	case CMD_MOTOR_OFF:
+		break;
+
+	// DEFAULT
+	default:
+		{
+			ERROR_LOG(SERIALINTERFACE, "unknown SI command     (0x%x)", command);
+		}			
+		break;
+	}
+
+	return _iLength;
+}
+
+
+// GetData
+
+// Return true on new data (max 7 Bytes and 6 bits ;)
+// [00?SYXBA] [1LRZUDRL] [x] [y] [cx] [cy] [l] [r]
+//  |\_ ERR_LATCH (error latched - check SISR)
+//  |_ ERR_STATUS (error on last GetData or SendCmd?)
+bool CSIDevice_GCSteeringWheel::GetData(u32& _Hi, u32& _Low)
+{
+	SPADStatus PadStatus;
+	memset(&PadStatus, 0, sizeof(PadStatus));
+	
+	Pad::GetStatus(ISIDevice::m_iDeviceNumber, &PadStatus);
+	Movie::CallInputManip(&PadStatus, ISIDevice::m_iDeviceNumber);
+
+	u32 netValues[2];
+	if (NetPlay_GetInput(ISIDevice::m_iDeviceNumber, PadStatus, netValues))
+	{
+		_Hi  = netValues[0];	// first 4 bytes
+		_Low = netValues[1];	// last  4 bytes
+		return true;
+	}
+
+	Movie::SetPolledDevice();
+
+	if(Movie::IsPlayingInput())
+	{
+		Movie::PlayController(&PadStatus, ISIDevice::m_iDeviceNumber);
+		Movie::InputUpdate();
+	}
+	else if(Movie::IsRecordingInput())
+	{
+		Movie::RecordInput(&PadStatus, ISIDevice::m_iDeviceNumber);
+		Movie::InputUpdate();
+	}
+	else
+		Movie::CheckPadStatus(&PadStatus, ISIDevice::m_iDeviceNumber);
+
+	// Thankfully changing mode does not change the high bits ;)
+	_Hi  = (u32)((u8)PadStatus.stickX); // Steering
+	_Hi |= 0x800; // Pedal connected flag
+	_Hi |= (u32)((u16)(PadStatus.button | PAD_USE_ORIGIN) << 16);
+
+	// Low bits are packed differently per mode
+	if (m_Mode == 0 || m_Mode == 5 || m_Mode == 7)
+	{
+		_Low  = (u8)(PadStatus.analogB >> 4);					// Top 4 bits
+		_Low |= (u32)((u8)(PadStatus.analogA >> 4) << 4);		// Top 4 bits
+		_Low |= (u32)((u8)(PadStatus.triggerRight >> 4) << 8);	// Top 4 bits
+		_Low |= (u32)((u8)(PadStatus.triggerLeft >> 4) << 12);	// Top 4 bits
+		_Low |= (u32)((u8)(PadStatus.substickY) << 16);			// All 8 bits
+		_Low |= (u32)((u8)(PadStatus.substickX) << 24);			// All 8 bits
+	}
+	else if (m_Mode == 1)
+	{
+		_Low  = (u8)(PadStatus.analogB >> 4);					// Top 4 bits
+		_Low |= (u32)((u8)(PadStatus.analogA >> 4) << 4);		// Top 4 bits
+		_Low |= (u32)((u8)PadStatus.triggerRight << 8);			// All 8 bits
+		_Low |= (u32)((u8)PadStatus.triggerLeft << 16);			// All 8 bits
+		_Low |= (u32)((u8)PadStatus.substickY << 24);			// Top 4 bits
+		_Low |= (u32)((u8)PadStatus.substickX << 28);			// Top 4 bits
+	}
+	else if (m_Mode == 2)
+	{
+		_Low  = (u8)(PadStatus.analogB);						// All 8 bits
+		_Low |= (u32)((u8)(PadStatus.analogA) << 8);			// All 8 bits
+		_Low |= (u32)((u8)(PadStatus.triggerRight >> 4) << 16);	// Top 4 bits
+		_Low |= (u32)((u8)(PadStatus.triggerLeft >> 4) << 20);	// Top 4 bits
+		_Low |= (u32)((u8)PadStatus.substickY << 24);			// Top 4 bits
+		_Low |= (u32)((u8)PadStatus.substickX << 28);			// Top 4 bits
+	}
+	else if (m_Mode == 3)
+	{
+		// Analog A/B are always 0
+		_Low  = (u8)PadStatus.triggerRight;						// All 8 bits
+		_Low |= (u32)((u8)PadStatus.triggerLeft << 8);			// All 8 bits
+		_Low |= (u32)((u8)PadStatus.substickY << 16);			// All 8 bits
+		_Low |= (u32)((u8)PadStatus.substickX << 24);			// All 8 bits
+	}
+	else if (m_Mode == 4)
+	{
+		_Low  = (u8)(PadStatus.analogB);						// All 8 bits
+		_Low |= (u32)((u8)(PadStatus.analogA) << 8);			// All 8 bits
+		// triggerLeft/Right are always 0
+		_Low |= (u32)((u8)PadStatus.substickY << 16);			// All 8 bits
+		_Low |= (u32)((u8)PadStatus.substickX << 24);			// All 8 bits
+	}
+	else if (m_Mode == 6)
+	{
+		_Low  = (u8)PadStatus.triggerRight;						// All 8 bits
+		_Low |= (u32)((u8)PadStatus.triggerLeft << 8);			// All 8 bits
+
+		// The GC Steering Wheel appears to have combined pedals
+		// (both the Accelerate and Brake pedals are mapped to a single axis)
+		// We use the stickY axis for the pedals.
+		if (PadStatus.stickY < 128)
+			_Low |= (u32)((u8)(255 - ((PadStatus.stickY & 0x7f) * 2)) << 16); // All 8 bits (Brake)
+		if (PadStatus.stickY >= 128)
+			_Low |= (u32)((u8)((PadStatus.stickY & 0x7f) * 2) << 24); // All 8 bits (Accelerate)
+	}
+
+	// Keep track of the special button combos (embedded in controller hardware... :( )
+	EButtonCombo tempCombo;
+	if ((PadStatus.button & 0xff00) == (PAD_BUTTON_Y|PAD_BUTTON_X|PAD_BUTTON_START))
+		tempCombo = COMBO_ORIGIN;
+	else if ((PadStatus.button & 0xff00) == (PAD_BUTTON_B|PAD_BUTTON_X|PAD_BUTTON_START))
+		tempCombo = COMBO_RESET;
+	else
+		tempCombo = COMBO_NONE;
+	if (tempCombo != m_LastButtonCombo)
+	{
+		m_LastButtonCombo = tempCombo;
+		if (m_LastButtonCombo != COMBO_NONE)
+			m_TButtonComboStart = CoreTiming::GetTicks();
+	}
+	if (m_LastButtonCombo != COMBO_NONE)
+	{
+		m_TButtonCombo = CoreTiming::GetTicks();
+		if ((m_TButtonCombo - m_TButtonComboStart) > SystemTimers::GetTicksPerSecond() * 3)
+		{
+			if (m_LastButtonCombo == COMBO_RESET)
+				ProcessorInterface::ResetButton_Tap();
+			else if (m_LastButtonCombo == COMBO_ORIGIN)
+			{
+				m_Origin.uOriginStickX		= PadStatus.stickX;
+				m_Origin.uOriginStickY		= PadStatus.stickY;
+				m_Origin.uSubStickStickX	= PadStatus.substickX;
+				m_Origin.uSubStickStickY	= PadStatus.substickY;
+				m_Origin.uTrigger_L			= PadStatus.triggerLeft;
+				m_Origin.uTrigger_R			= PadStatus.triggerRight;
+			}
+			m_LastButtonCombo = COMBO_NONE;
+		}
+	}
+
+	return true;
+}
+
+
+// SendCommand
+void CSIDevice_GCSteeringWheel::SendCommand(u32 _Cmd, u8 _Poll)
+{
+	UCommand command(_Cmd);
+
+	switch (command.Command)
+	{
+	// Costis sent it in some demos :)
+	case 0x00:
+		break;
+
+	case CMD_FORCE:
+		{
+			unsigned int uStrength = command.Parameter1; // 0 = left strong, 127 = left weak, 128 = right weak, 255 = right strong
+			unsigned int uType = command.Parameter2;  // 06 = motor on, 04 = motor off
+
+			// get the correct pad number that should rumble locally when using netplay
+			const u8 numPAD = NetPlay_GetPadNum(ISIDevice::m_iDeviceNumber);
+
+			if (numPAD < 4)
+				Pad::Motor(numPAD, uType, uStrength);
+
+			if (!_Poll)
+			{
+				m_Mode = command.Parameter2;
+				INFO_LOG(SERIALINTERFACE, "PAD %i set to mode %i", ISIDevice::m_iDeviceNumber, m_Mode);
+			}
+		}
+		break;
+
+	case CMD_WRITE:
+		{
+			unsigned int uType = command.Parameter1;  // 0 = stop, 1 = rumble, 2 = stop hard
+			unsigned int uStrength = command.Parameter2;
+
+			// get the correct pad number that should rumble locally when using netplay
+			const u8 numPAD = NetPlay_GetPadNum(ISIDevice::m_iDeviceNumber);
+
+			if (numPAD < 4)
+				Pad::Rumble(numPAD, uType, uStrength);
+
+			if (!_Poll)
+			{
+				m_Mode = command.Parameter2;
+				INFO_LOG(SERIALINTERFACE, "PAD %i set to mode %i", ISIDevice::m_iDeviceNumber, m_Mode);
+			}
+		}
+		break;
+
+	default:
+		{
+			ERROR_LOG(SERIALINTERFACE, "unknown direct command     (0x%x)", _Cmd);
+		}			
+		break;
+	}
+}
+
+// Savestate support
+void CSIDevice_GCSteeringWheel::DoState(PointerWrap& p)
+{
+	p.Do(m_Origin);
+	p.Do(m_Mode);
+	p.Do(m_TButtonComboStart);
+	p.Do(m_TButtonCombo);
+	p.Do(m_LastButtonCombo);
+}

Source/Core/Core/Src/HW/SI_DeviceGCSteeringWheel.h

@@ -0,0 +1,119 @@
+// Copyright (C) 2003 Dolphin Project.
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, version 2.0.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License 2.0 for more details.
+
+// A copy of the GPL 2.0 should have been included with the program.
+// If not, see http://www.gnu.org/licenses/
+
+// Official SVN repository and contact information can be found at
+// http://code.google.com/p/dolphin-emu/
+
+#ifndef _SI_DEVICEGCSTEERINGWHEEL_H
+#define _SI_DEVICEGCSTEERINGWHEEL_H
+
+#include "SI_Device.h"
+#include "GCPadStatus.h"
+
+
+// standard gamecube controller
+class CSIDevice_GCSteeringWheel : public ISIDevice
+{
+private:
+	
+	// Commands
+	enum EBufferCommands
+	{
+		CMD_RESET		= 0x00,
+		CMD_ORIGIN		= 0x41,
+		CMD_RECALIBRATE	= 0x42,
+		CMD_MOTOR_OFF	= 0xff,
+	};
+
+	struct SOrigin
+	{
+		u8 uCommand;// Maybe should be button bits?
+		u8 unk_1;	// ..and this would be the other half
+		u8 uOriginStickX;
+		u8 uOriginStickY;
+		u8 uSubStickStickX;
+		u8 uSubStickStickY;
+		u8 uTrigger_L;
+		u8 uTrigger_R;
+		u8 unk_4;
+		u8 unk_5;
+		u8 unk_6;
+		u8 unk_7;
+	};
+
+	enum EDirectCommands
+	{
+		CMD_FORCE = 0x30,
+		CMD_WRITE = 0x40
+	};
+
+	union UCommand
+	{
+		u32 Hex;
+		struct  
+		{
+			u32 Parameter1	:	8;
+			u32 Parameter2	:	8;
+			u32 Command		:	8;
+			u32				:	8;
+		};
+		UCommand()				{Hex = 0;}
+		UCommand(u32 _iValue)	{Hex = _iValue;}		
+	};
+
+	enum EButtonCombo
+	{
+		COMBO_NONE = 0,
+		COMBO_ORIGIN,
+		COMBO_RESET
+	};
+
+	// struct to compare input against
+	// Set on connection and (standard pad only) on button combo
+	SOrigin m_Origin;
+
+	// PADAnalogMode
+	u8 m_Mode;
+
+	// Timer to track special button combos:
+	// y, X, start for 3 seconds updates origin with current status
+	//   Technically, the above is only on standard pad, wavebird does not support it for example
+	// b, x, start for 3 seconds triggers reset (PI reset button interrupt)
+	u64 m_TButtonComboStart, m_TButtonCombo;
+	// Type of button combo from the last/current poll
+	EButtonCombo m_LastButtonCombo;
+
+public:
+
+	// Constructor
+	CSIDevice_GCSteeringWheel(SIDevices device, int _iDeviceNumber);
+
+	// Run the SI Buffer
+	virtual int RunBuffer(u8* _pBuffer, int _iLength);
+
+	// Send and Receive pad input from network
+	static bool NetPlay_GetInput(u8 numPAD, SPADStatus status, u32 *PADStatus);
+	static u8 NetPlay_GetPadNum(u8 numPAD);
+
+	// Return true on new data
+	virtual bool GetData(u32& _Hi, u32& _Low);
+
+	// Send a command directly
+	virtual void SendCommand(u32 _Cmd, u8 _Poll);
+
+	// Savestate support
+	virtual void DoState(PointerWrap& p);
+};
+
+#endif

Source/Core/Core/Src/NetPlay.cpp

@@ -22,6 +22,7 @@
 #include "IPC_HLE/WII_IPC_HLE_WiiMote.h"
 // for gcpad
 #include "HW/SI_DeviceGCController.h"
+#include "HW/SI_DeviceGCSteeringWheel.h"
 // for gctime
 #include "HW/EXI_DeviceIPL.h"
 // for wiimote/ OSD messages
@@ -296,6 +297,11 @@ bool CSIDevice_GCController::NetPlay_GetInput(u8 numPAD, SPADStatus PadStatus, u
 		return false;
 }
 
+bool CSIDevice_GCSteeringWheel::NetPlay_GetInput(u8 numPAD, SPADStatus PadStatus, u32 *PADStatus)
+{
+	return CSIDevice_GCController::NetPlay_GetInput(numPAD, PadStatus, PADStatus);
+}
+
 // called from ---CPU--- thread
 // so all players' games get the same time
 u32 CEXIIPL::NetPlay_GetGCTime()
@@ -320,6 +326,11 @@ u8 CSIDevice_GCController::NetPlay_GetPadNum(u8 numPAD)
 		return numPAD;
 }
 
+u8 CSIDevice_GCSteeringWheel::NetPlay_GetPadNum(u8 numPAD)
+{
+	return CSIDevice_GCController::NetPlay_GetPadNum(numPAD);
+}
+
 // called from ---CPU--- thread
 // wiimote update / used for frame counting
 //void CWII_IPC_HLE_Device_usb_oh1_57e_305::NetPlay_WiimoteUpdate(int _number)

Source/Core/DolphinWX/Src/ConfigMain.cpp

@@ -79,6 +79,7 @@ static const wxLanguage langIds[] =
 #define DEV_DUMMY_STR		_trans("Dummy")
 
 #define SIDEV_STDCONT_STR	_trans("Standard Controller")
+#define SIDEV_STEERING_STR	_trans("Steering Wheel")
 #define SIDEV_BONGO_STR		_trans("TaruKonga (Bongos)")
 #define SIDEV_GBA_STR		"GBA"
 #define SIDEV_AM_BB_STR		_trans("AM-Baseboard")
@@ -391,6 +392,7 @@ void CConfigMain::InitializeGUIValues()
 	wxArrayString SIDevices;
 		SIDevices.Add(_(DEV_NONE_STR));
 		SIDevices.Add(_(SIDEV_STDCONT_STR));
+		SIDevices.Add(_(SIDEV_STEERING_STR));
 		SIDevices.Add(_(SIDEV_BONGO_STR));
 		SIDevices.Add(_(SIDEV_GBA_STR));
 		SIDevices.Add(_(SIDEV_AM_BB_STR));
@@ -443,15 +445,18 @@ void CConfigMain::InitializeGUIValues()
 		case SIDEVICE_GC_CONTROLLER:
 			GCSIDevice[i]->SetStringSelection(SIDevices[1]);
 			break;
-		case SIDEVICE_GC_TARUKONGA:
+		case SIDEVICE_GC_STEERING:
 			GCSIDevice[i]->SetStringSelection(SIDevices[2]);
 			break;
-		case SIDEVICE_GC_GBA:
+		case SIDEVICE_GC_TARUKONGA:
 			GCSIDevice[i]->SetStringSelection(SIDevices[3]);
 			break;
-		case SIDEVICE_AM_BASEBOARD:
+		case SIDEVICE_GC_GBA:
 			GCSIDevice[i]->SetStringSelection(SIDevices[4]);
 			break;
+		case SIDEVICE_AM_BASEBOARD:
+			GCSIDevice[i]->SetStringSelection(SIDevices[5]);
+			break;
 		default:
 			GCSIDevice[i]->SetStringSelection(SIDevices[0]);
 			break;
@@ -1059,6 +1064,8 @@ void CConfigMain::ChooseSIDevice(wxString deviceName, int deviceNum)
 	SIDevices tempType;
 	if (!deviceName.compare(WXSTR_TRANS(SIDEV_STDCONT_STR)))
 		tempType = SIDEVICE_GC_CONTROLLER;
+	else if (!deviceName.compare(WXSTR_TRANS(SIDEV_STEERING_STR)))
+		tempType = SIDEVICE_GC_STEERING;
 	else if (!deviceName.compare(WXSTR_TRANS(SIDEV_BONGO_STR)))
 		tempType = SIDEVICE_GC_TARUKONGA;
 	else if (!deviceName.compare(wxT(SIDEV_GBA_STR)))

Source/Core/InputCommon/Src/ControllerInterface/DInput/DInputJoystick.cpp

@@ -254,9 +254,9 @@ Joystick::Joystick( /*const LPCDIDEVICEINSTANCE lpddi, */const LPDIRECTINPUTDEVI
 	for (unsigned int offset = 0; offset < DIJOFS_BUTTON(0) / sizeof(LONG); ++offset)
 	{
 		range.diph.dwObj = offset * sizeof(LONG);
-		// try to set some nice power of 2 values (8192)
+		// try to set some nice power of 2 values (128) to match the GameCube controls
-		range.lMin = -(1 << 13);
+		range.lMin = -(1 << 7);
-		range.lMax = (1 << 13);
+		range.lMax = (1 << 7);
 		m_device->SetProperty(DIPROP_RANGE, &range.diph);
 		// but i guess not all devices support setting range
 		// so i getproperty right afterward incase it didn't set :P
@@ -281,17 +281,19 @@ Joystick::Joystick( /*const LPCDIDEVICEINSTANCE lpddi, */const LPDIRECTINPUTDEVI
 	if ( objects.size() )
 	{
 		// temporary
-		DWORD rgdwAxes[] = {DIJOFS_X, DIJOFS_Y};
+		DWORD rgdwAxes[2] = {DIJOFS_X, DIJOFS_Y};
-		LONG rglDirection[] = {0, 0};
+		LONG rglDirection[2] = {-200, 0};
 
 		DIEFFECT eff;
 		ZeroMemory(&eff, sizeof(eff));
 		eff.dwSize = sizeof(DIEFFECT);
 		eff.dwFlags = DIEFF_CARTESIAN | DIEFF_OBJECTOFFSETS;
 		eff.dwDuration = INFINITE;	// (4 * DI_SECONDS)
+		eff.dwSamplePeriod = 0;
 		eff.dwGain = DI_FFNOMINALMAX;
 		eff.dwTriggerButton = DIEB_NOTRIGGER;
-		eff.cAxes = std::min((DWORD)2, (DWORD)objects.size());
+		eff.dwTriggerRepeatInterval = 0;
+		eff.cAxes = std::min((DWORD)1, (DWORD)objects.size());
 		eff.rgdwAxes = rgdwAxes;
 		eff.rglDirection = rglDirection;
 
@@ -310,7 +312,12 @@ Joystick::Joystick( /*const LPCDIDEVICEINSTANCE lpddi, */const LPDIRECTINPUTDEVI
 		{
 			// ugly if ladder
 			if (0 == f)
+			{
+				DICONSTANTFORCE  diCF = {-10000};
+				diCF.lMagnitude = DI_FFNOMINALMAX;
 				eff.cbTypeSpecificParams = sizeof(DICONSTANTFORCE);
+				eff.lpvTypeSpecificParams = &diCF;
+			}
 			else if (1 == f)
 				eff.cbTypeSpecificParams = sizeof(DIRAMPFORCE);
 			else
@@ -528,7 +535,11 @@ ControlState Joystick::Hat::GetState() const
 
 void Joystick::ForceConstant::SetState(const ControlState state)
 {
-	const LONG new_val = LONG(10000 * state);
+	float force = abs(state - 0.5) * 2;
+	if (state < 0.5)
+		force = -force;
+
+	const LONG new_val = LONG(10000 * force);
 
 	LONG &val = params.lMagnitude;
 	if (val != new_val)