From 3527b49459ab730a09cb646361ae7528a26a2cf8 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Thu, 21 Jan 2021 22:30:34 -0800
Subject: [PATCH] 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                   | 51 +++++++++++++++++++++++
 src/hidapi/SDL_hidapi.h                   | 28 +++++++++++++
 src/joystick/hidapi/SDL_hidapi_gamecube.c |  3 ++
 3 files changed, 82 insertions(+)
 create mode 100644 src/hidapi/SDL_hidapi.h

diff --git a/src/hidapi/SDL_hidapi.c b/src/hidapi/SDL_hidapi.c
index d9ad45fda..670a51719 100644
--- a/src/hidapi/SDL_hidapi.c
+++ b/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: */
diff --git a/src/hidapi/SDL_hidapi.h b/src/hidapi/SDL_hidapi.h
new file mode 100644
index 000000000..305a00a5c
--- /dev/null
+++ b/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: */
diff --git a/src/joystick/hidapi/SDL_hidapi_gamecube.c b/src/joystick/hidapi/SDL_hidapi_gamecube.c
index 6780a0fdd..3f275c84b 100644
--- a/src/joystick/hidapi/SDL_hidapi_gamecube.c
+++ b/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();