Help!! External buttons on Android OS

Question

I have created a touch table. I am using my odroid xu4 single board computer. Im trying to put external buttons in the table ie. Home, volume etc. Im trying to connect a zero delay usb encoder. When I connect the encoder nothing happens with android. A third party program registers all of the buttons as 189. 189 means dispatchkeyevent.
steps so far:
root access
mount system > mount -o remount, rw -t yaffs2 /dev/block/mtdblock4 /system
edit /system/usr/keylayout/qwerty.kl

Answer 1

i think you need to install some drivers.