Fixed initializing the Nyko and EVORETRO GameCube adaptors

This requires root on most Linux distributions, as we have to directly send USB messages to the devices to enable input reports.

src/hidapi/SDL_hidapi.c

@@ -955,6 +955,57 @@ HID_API_EXPORT const wchar_t* HID_API_CALL hid_error(hid_device *device)
     return wrapper->backend->hid_error(wrapper->device);
 }
 
+/* This is needed to enable input for Nyko and EVORETRO GameCube adaptors */
+void SDL_EnableGameCubeAdaptors(void)
+{
+#ifdef SDL_LIBUSB_DYNAMIC
+    libusb_context *usb_context = NULL;
+    libusb_device **devs = NULL;
+    libusb_device_handle *handle = NULL;
+    struct libusb_device_descriptor desc;
+    ssize_t i, num_devs;
+    int kernel_detached = 0;
+
+    if (libusb_init(&usb_context) == 0) {
+        num_devs = libusb_get_device_list(usb_context, &devs);
+        for (i = 0; i < num_devs; ++i) {
+            if (libusb_get_device_descriptor(devs[i], &desc) != 0) {
+                continue;
+            }
+
+            if (desc.idVendor != 0x057e || desc.idProduct != 0x0337) {
+                continue;
+            }
+
+            if (libusb_open(devs[i], &handle) != 0) {
+                continue;
+            }
+
+            if (libusb_kernel_driver_active(handle, 0)) {
+                if (libusb_detach_kernel_driver(handle, 0) == 0) {
+                    kernel_detached = 1;
+                }
+            }
+
+            if (libusb_claim_interface(handle, 0) == 0) {
+                libusb_control_transfer(handle, 0x21, 11, 0x0001, 0, NULL, 0, 1000);
+                libusb_release_interface(handle, 0);
+            }
+
+            if (kernel_detached) {
+                libusb_attach_kernel_driver(handle, 0);
+            }
+
+            libusb_close(handle);
+        }
+
+        libusb_free_device_list(devs, 1);
+
+        libusb_exit(usb_context);
+    }
+#endif /* SDL_LIBUSB_DYNAMIC */
+}
+
 #endif /* SDL_JOYSTICK_HIDAPI */
 
 /* vi: set sts=4 ts=4 sw=4 expandtab: */

src/hidapi/SDL_hidapi.h

@@ -0,0 +1,28 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2021 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifdef SDL_JOYSTICK_HIDAPI
+
+extern void SDL_EnableGameCubeAdaptors(void);
+
+#endif /* SDL_JOYSTICK_HIDAPI */
+
+/* vi: set sts=4 ts=4 sw=4 expandtab: */

src/joystick/hidapi/SDL_hidapi_gamecube.c

@@ -32,6 +32,7 @@
 #include "../SDL_sysjoystick.h"
 #include "SDL_hidapijoystick_c.h"
 #include "SDL_hidapi_rumble.h"
+#include "../../hidapi/SDL_hidapi.h"
 
 
 #ifdef SDL_JOYSTICK_HIDAPI_GAMECUBE
@@ -129,6 +130,8 @@ HIDAPI_DriverGameCube_InitDevice(SDL_HIDAPI_Device *device)
     Uint8 initMagic = 0x13;
     Uint8 rumbleMagic = 0x11;
 
+    SDL_EnableGameCubeAdaptors();
+
     ctx = (SDL_DriverGameCube_Context *)SDL_calloc(1, sizeof(*ctx));
     if (!ctx) {
         SDL_OutOfMemory();