Try loading the module:
modprobe joydev
and see if that works. You can test your joypad by typing
cat /dev/js0. Press some keys on the joypad and see if that works( a bunch of garbage should appear on the console). If not, you may need to load further modules, such as
usb-uhci, hid and adi
Good luck!
P.S: you need to be root in order to load/unload modules
