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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.
This commit is contained in:
Sam Lantinga 2014-04-17 20:18:50 -07:00
parent 5439f9dd87
commit 7ae52b1730
1 changed files with 15 additions and 1 deletions
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14
src/core/linux/SDL_udev.c
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@ -308,11 +308,25 @@ device_event(SDL_UDEV_deviceevent type, struct udev_device *dev)
} }
if (devclass == 0) { if (devclass == 0) {
// 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; return;
} }
} else { } else {
return; return;
} }
}
} else {
return;
}
/* Process callbacks */ /* Process callbacks */
for (item = _this->first; item != NULL; item = item->next) { for (item = _this->first; item != NULL; item = item->next) {