touchscreen on USB

Hello.

Is it possible to connect a touchscreen
(devi-elo or devi-carol) as a USB device?

Is it as simple as starting the usb mouse device
and then telling touchscreen to look for
/dev/usb/usbmouse:

devu-uhci &
devu-mouse &
devi-elo smartset fd -d/dev/usbmouse0

or does a special devu-touchscreen have to
be written ?

Best regards,

Michel Benoit
Saab Communication
Stockholm Sweden