Find just joysticks and gamepads (as opposed to, say, USB Audio devices), in

the MacOSX/Darwin joystick initialization code.

src/joystick/darwin/SDL_sysjoystick.c

@@ -647,9 +647,9 @@ int SDL_SYS_JoystickInit(void)
 
 		/* Filter device list to non-keyboard/mouse stuff */ 
 		if ( device->usagePage == kHIDPage_GenericDesktop &&
-		     (device->usage == kHIDUsage_GD_Keyboard ||
-		      device->usage == kHIDUsage_GD_Mouse)) {
-            
+		     (device->usage != kHIDUsage_GD_Joystick ||
+		      device->usage != kHIDUsage_GD_Gamepad)) {
+
 			/* release memory for the device */
 			HIDDisposeDevice (&device);
 			DisposePtr((Ptr)device);