(I've never tried to use a joystick with a computer before, so forgive me for not knowing how to do this

)
I've got this cheap USB video game controller, it has an 8 way D-Pad with six buttons (A clone of the Sega Saturn controller) but it doesn't seem to want to work. It shows up in dmesg
(usb 4-2: new low speed USB device using address 2
input: USB HID v1.00 Joystick [Saitek Saitek P150] on usb-0000:00:10.2-2)
and is using the input device /dev/input/js0. Is there something I have to add to xorg.config?