nsyshid: Add backends for cross platform USB passthrough support (#950)

.github/workflows/build.yml

@@ -232,7 +232,7 @@ jobs:
     - name: "Install system dependencies"
       run: |
         brew update
-        brew install llvm@15 ninja nasm molten-vk
+        brew install llvm@15 ninja nasm molten-vk automake libtool
 
     - name: "Bootstrap vcpkg"
       run: |

BUILD.md

@@ -86,7 +86,7 @@ You can skip this section if you have an Intel Mac. Every time you compile, you
 
 ### Installing dependencies
 
-`brew install boost git cmake llvm ninja nasm molten-vk`
+`brew install boost git cmake llvm ninja nasm molten-vk automake libtool`
 
 ### Build Cemu using cmake and clang
 1. `git clone --recursive https://github.com/cemu-project/Cemu`

CMakeLists.txt

@@ -102,6 +102,23 @@ if (WIN32)
 endif()
 option(ENABLE_CUBEB "Enabled cubeb backend" ON)
 
+# usb hid backends
+if (WIN32)
+	option(ENABLE_NSYSHID_WINDOWS_HID "Enables the native Windows HID backend for nsyshid" ON)
+endif ()
+# libusb and windows hid backends shouldn't be active at the same time; otherwise we'd see all devices twice!
+if (NOT ENABLE_NSYSHID_WINDOWS_HID)
+	option(ENABLE_NSYSHID_LIBUSB "Enables the libusb backend for nsyshid" ON)
+else ()
+	set(ENABLE_NSYSHID_LIBUSB OFF CACHE BOOL "" FORCE)
+endif ()
+if (ENABLE_NSYSHID_WINDOWS_HID)
+	add_compile_definitions(NSYSHID_ENABLE_BACKEND_WINDOWS_HID)
+endif ()
+if (ENABLE_NSYSHID_LIBUSB)
+	add_compile_definitions(NSYSHID_ENABLE_BACKEND_LIBUSB)
+endif ()
+
 option(ENABLE_WXWIDGETS "Build with wxWidgets UI (Currently required)" ON)
 
 set(THREADS_PREFER_PTHREAD_FLAG true)

cmake/Findlibusb.cmake

@@ -0,0 +1,20 @@
+# SPDX-FileCopyrightText: 2022 Andrea Pappacoda <andrea@pappacoda.it>
+# SPDX-License-Identifier: ISC
+
+find_package(libusb CONFIG)
+if (NOT libusb_FOUND)
+    find_package(PkgConfig)
+    if (PKG_CONFIG_FOUND)
+        pkg_search_module(libusb IMPORTED_TARGET GLOBAL libusb-1.0 libusb)
+        if (libusb_FOUND)
+            add_library(libusb::libusb ALIAS PkgConfig::libusb)
+        endif ()
+    endif ()
+endif ()
+
+find_package_handle_standard_args(libusb
+        REQUIRED_VARS
+        libusb_LINK_LIBRARIES
+        libusb_FOUND
+        VERSION_VAR libusb_VERSION
+)

src/Cafe/CMakeLists.txt

@@ -434,6 +434,14 @@ add_library(CemuCafe
   OS/libs/nn_uds/nn_uds.h
   OS/libs/nsyshid/nsyshid.cpp
   OS/libs/nsyshid/nsyshid.h
+  OS/libs/nsyshid/Backend.h
+  OS/libs/nsyshid/AttachDefaultBackends.cpp
+  OS/libs/nsyshid/Whitelist.cpp
+  OS/libs/nsyshid/Whitelist.h
+  OS/libs/nsyshid/BackendLibusb.cpp
+  OS/libs/nsyshid/BackendLibusb.h
+  OS/libs/nsyshid/BackendWindowsHID.cpp
+  OS/libs/nsyshid/BackendWindowsHID.h
   OS/libs/nsyskbd/nsyskbd.cpp
   OS/libs/nsyskbd/nsyskbd.h
   OS/libs/nsysnet/nsysnet.cpp
@@ -524,6 +532,17 @@ if (ENABLE_WAYLAND)
   target_link_libraries(CemuCafe PUBLIC Wayland::Client)
 endif()
 
+if (ENABLE_NSYSHID_LIBUSB)
+	if (ENABLE_VCPKG)
+		find_package(libusb CONFIG REQUIRED)
+		target_include_directories(CemuCafe PRIVATE ${LIBUSB_INCLUDE_DIRS})
+		target_link_libraries(CemuCafe PRIVATE ${LIBUSB_LIBRARIES})
+	else ()
+		find_package(libusb MODULE REQUIRED)
+		target_link_libraries(CemuCafe PRIVATE libusb::libusb)
+	endif ()
+endif ()
+
 if (ENABLE_WXWIDGETS)
 	target_link_libraries(CemuCafe PRIVATE wx::base wx::core)
 endif()

src/Cafe/OS/libs/nsyshid/AttachDefaultBackends.cpp

@@ -0,0 +1,41 @@
+#include "nsyshid.h"
+#include "Backend.h"
+
+#if NSYSHID_ENABLE_BACKEND_LIBUSB
+
+#include "BackendLibusb.h"
+
+#endif
+
+#if NSYSHID_ENABLE_BACKEND_WINDOWS_HID
+
+#include "BackendWindowsHID.h"
+
+#endif
+
+namespace nsyshid::backend
+{
+	void AttachDefaultBackends()
+	{
+#if NSYSHID_ENABLE_BACKEND_LIBUSB
+		// add libusb backend
+		{
+			auto backendLibusb = std::make_shared<backend::libusb::BackendLibusb>();
+			if (backendLibusb->IsInitialisedOk())
+			{
+				AttachBackend(backendLibusb);
+			}
+		}
+#endif // NSYSHID_ENABLE_BACKEND_LIBUSB
+#if NSYSHID_ENABLE_BACKEND_WINDOWS_HID
+		// add windows hid backend
+		{
+			auto backendWindowsHID = std::make_shared<backend::windows::BackendWindowsHID>();
+			if (backendWindowsHID->IsInitialisedOk())
+			{
+				AttachBackend(backendWindowsHID);
+			}
+		}
+#endif // NSYSHID_ENABLE_BACKEND_WINDOWS_HID
+	}
+} // namespace nsyshid::backend

src/Cafe/OS/libs/nsyshid/Backend.h

@@ -0,0 +1,141 @@
+#ifndef CEMU_NSYSHID_BACKEND_H
+#define CEMU_NSYSHID_BACKEND_H
+
+#include <list>
+#include <memory>
+#include <mutex>
+
+#include "Common/precompiled.h"
+
+namespace nsyshid
+{
+	typedef struct
+	{
+		/* +0x00 */ uint32be handle;
+		/* +0x04 */ uint32 ukn04;
+		/* +0x08 */ uint16 vendorId;  // little-endian ?
+		/* +0x0A */ uint16 productId; // little-endian ?
+		/* +0x0C */ uint8 ifIndex;
+		/* +0x0D */ uint8 subClass;
+		/* +0x0E */ uint8 protocol;
+		/* +0x0F */ uint8 paddingGuessed0F;
+		/* +0x10 */ uint16be maxPacketSizeRX;
+		/* +0x12 */ uint16be maxPacketSizeTX;
+	} HID_t;
+
+	static_assert(offsetof(HID_t, vendorId) == 0x8, "");
+	static_assert(offsetof(HID_t, productId) == 0xA, "");
+	static_assert(offsetof(HID_t, ifIndex) == 0xC, "");
+	static_assert(offsetof(HID_t, protocol) == 0xE, "");
+
+	class Device {
+	  public:
+		Device() = delete;
+
+		Device(uint16 vendorId,
+			   uint16 productId,
+			   uint8 interfaceIndex,
+			   uint8 interfaceSubClass,
+			   uint8 protocol);
+
+		Device(const Device& device) = delete;
+
+		Device& operator=(const Device& device) = delete;
+
+		virtual ~Device() = default;
+
+		HID_t* m_hid; // this info is passed to applications and must remain intact
+
+		uint16 m_vendorId;
+		uint16 m_productId;
+		uint8 m_interfaceIndex;
+		uint8 m_interfaceSubClass;
+		uint8 m_protocol;
+		uint16 m_maxPacketSizeRX;
+		uint16 m_maxPacketSizeTX;
+
+		virtual void AssignHID(HID_t* hid);
+
+		virtual bool Open() = 0;
+
+		virtual void Close() = 0;
+
+		virtual bool IsOpened() = 0;
+
+		enum class ReadResult
+		{
+			Success,
+			Error,
+			ErrorTimeout,
+		};
+
+		virtual ReadResult Read(uint8* data, sint32 length, sint32& bytesRead) = 0;
+
+		enum class WriteResult
+		{
+			Success,
+			Error,
+			ErrorTimeout,
+		};
+
+		virtual WriteResult Write(uint8* data, sint32 length, sint32& bytesWritten) = 0;
+
+		virtual bool GetDescriptor(uint8 descType,
+								   uint8 descIndex,
+								   uint8 lang,
+								   uint8* output,
+								   uint32 outputMaxLength) = 0;
+
+		virtual bool SetProtocol(uint32 ifIndef, uint32 protocol) = 0;
+
+		virtual bool SetReport(uint8* reportData, sint32 length, uint8* originalData, sint32 originalLength) = 0;
+	};
+
+	class Backend {
+	  public:
+		Backend();
+
+		Backend(const Backend& backend) = delete;
+
+		Backend& operator=(const Backend& backend) = delete;
+
+		virtual ~Backend() = default;
+
+		void DetachAllDevices();
+
+		// called from nsyshid when this backend is attached - do not call this yourself!
+		void OnAttach();
+
+		// called from nsyshid when this backend is detached - do not call this yourself!
+		void OnDetach();
+
+		bool IsBackendAttached();
+
+		virtual bool IsInitialisedOk() = 0;
+
+	  protected:
+		// try to attach a device - only works if this backend is attached
+		bool AttachDevice(const std::shared_ptr<Device>& device);
+
+		void DetachDevice(const std::shared_ptr<Device>& device);
+
+		std::shared_ptr<Device> FindDevice(std::function<bool(const std::shared_ptr<Device>&)> isWantedDevice);
+
+		bool IsDeviceWhitelisted(uint16 vendorId, uint16 productId);
+
+		// called from OnAttach() - attach devices that your backend can see here
+		virtual void AttachVisibleDevices() = 0;
+
+	  private:
+		std::list<std::shared_ptr<Device>> m_devices;
+		std::recursive_mutex m_devicesMutex;
+		bool m_isAttached;
+	};
+
+	namespace backend
+	{
+		void AttachDefaultBackends();
+	}
+} // namespace nsyshid
+
+#endif // CEMU_NSYSHID_BACKEND_H