Create a file called /etc/hal/fdi/policy/10-ideacom-idc-6680.fdi with the following contents:
evtouch raw 50 30 15 true 50 460 7920 750 7660
This will work great with a 2009 distribution (tested with Mandriva 2009.1) with no xorg.conf file. Remember to restart haldeamon to see changes take effect.