Commit 7ae52b1730da7f9368eb08f9f0b4564b25a3ad4d
2014-04-17T20:18:50
Fixed bug 2477 - [PATCH] Joysticks do not work on RHEL6/CentOS6 systems Ashley Whetter RHEL6 and CentOS6 systems still use an old version of udev (147). It wasn't until udev 148 (Yep. 1 version off!) that the input class system changed from "ID_CLASS" to "ID_INPUT_{JOYSTICK,KEYBOARD,MOUSE,etc}" (http://lwn.net/Articles/364728/). Because SDL2 looks for the ID_INPUT_X field this means that it never detects any input devices on RHEL6 systems. I've attached a patch which fixes the problem. If no input devices are detected with "ID_INPUT_X" then SDL will fallback to looking for the old style "ID_CLASS" udev field instead. Because of the "big change" between udev versions I doubt it'll ever get upgraded on RHEL6, but because RHEL7 is on the way I don't know if this patch is worth merging. Hopefully it'll help anyone out that's having this problem though.
diff --git a/src/core/linux/SDL_udev.c b/src/core/linux/SDL_udev.c
index da03b73..547779b 100644
--- a/src/core/linux/SDL_udev.c
+++ b/src/core/linux/SDL_udev.c
@@ -308,7 +308,21 @@ device_event(SDL_UDEV_deviceevent type, struct udev_device *dev)
}
if (devclass == 0) {
- return;
+ // Fall back to old style input classes
+ val = _this->udev_device_get_property_value(dev, "ID_CLASS");
+ if (val != NULL) {
+ if (SDL_strcmp(val, "joystick") == 0) {
+ devclass = SDL_UDEV_DEVICE_JOYSTICK;
+ } else if (SDL_strcmp(val, "mouse") == 0) {
+ devclass = SDL_UDEV_DEVICE_MOUSE;
+ } else if (SDL_strcmp(val, "kbd") == 0) {
+ devclass = SDL_UDEV_DEVICE_KEYBOARD;
+ } else {
+ return;
+ }
+ } else {
+ return;
+ }
}
} else {
return;