Reset the GC adapter rumble when stopping a game

And when loading a savestate, pausing, and starting dolphin as well
(right after the libusb initialization).

Intended fix for issue 9001

Source/Core/Core/Core.cpp

@@ -45,6 +45,9 @@
 #include "Core/HW/HW.h"
 #include "Core/HW/Memmap.h"
 #include "Core/HW/ProcessorInterface.h"
+#if defined(__LIBUSB__) || defined(_WIN32)
+#include "Core/HW/SI_GCAdapter.h"
+#endif
 #include "Core/HW/SystemTimers.h"
 #include "Core/HW/VideoInterface.h"
 #include "Core/HW/Wiimote.h"
@@ -274,6 +277,9 @@ void Stop()  // - Hammertime!
 
 		g_video_backend->Video_ExitLoop();
 	}
+#if defined(__LIBUSB__) || defined(_WIN32)
+	SI_GCAdapter::ResetRumble();
+#endif
 }
 
 void DeclareAsCPUThread()
@@ -608,6 +614,9 @@ void SetState(EState _State)
 	case CORE_PAUSE:
 		CPU::EnableStepping(true);  // Break
 		Wiimote::Pause();
+#if defined(__LIBUSB__) || defined(_WIN32)
+		SI_GCAdapter::ResetRumble();
+#endif
 		break;
 	case CORE_RUN:
 		CPU::EnableStepping(false);
@@ -716,6 +725,9 @@ bool PauseAndLock(bool doLock, bool unpauseOnUnlock)
 	// video has to come after CPU, because CPU thread can wait for video thread (s_efbAccessRequested).
 	g_video_backend->PauseAndLock(doLock, unpauseOnUnlock);
 
+#if defined(__LIBUSB__) || defined(_WIN32)
+	SI_GCAdapter::ResetRumble();
+#endif
 	return wasUnpaused;
 }
 

Source/Core/Core/HW/SI_GCAdapter.cpp

@@ -2,6 +2,7 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
+#include <algorithm>
 #include <libusb.h>
 #include <mutex>
 
@@ -295,6 +296,7 @@ static void AddGCAdapter(libusb_device* device)
 	s_detected = true;
 	if (s_detect_callback != nullptr)
 		s_detect_callback();
+	ResetRumble();
 }
 
 void Shutdown()
@@ -398,6 +400,23 @@ void Input(int chan, GCPadStatus* pad)
 	}
 }
 
+void ResetRumble()
+{
+	if (!SConfig::GetInstance().m_GameCubeAdapter)
+		return;
+	if (s_handle == nullptr || !s_detected)
+		return;
+
+	std::fill(std::begin(s_controller_rumble), std::end(s_controller_rumble), 0);
+
+	unsigned char rumble[5] = {0x11, s_controller_rumble[0], s_controller_rumble[1], s_controller_rumble[2], s_controller_rumble[3]};
+
+	int size = 0;
+	libusb_interrupt_transfer(s_handle, s_endpoint_out, rumble, sizeof(rumble), &size, 16);
+
+	DEBUG_LOG(SERIALINTERFACE, "Rumble state reset");
+}
+
 void Output(int chan, u8 rumble_command)
 {
 	if (s_handle == nullptr || !SConfig::GetInstance().m_GameCubeAdapter || !SConfig::GetInstance().m_AdapterRumble)

Source/Core/Core/HW/SI_GCAdapter.h

@@ -13,6 +13,7 @@ namespace SI_GCAdapter
 
 void Init();
 void Reset();
+void ResetRumble();
 void Setup();
 void Shutdown();
 void SetAdapterCallback(std::function<void(void)> func);