how can i use keypad library on embedded board???

Hi.
I'm working embedded programming using Qt creator.
I want to use keypad with board.
default, I set QWS_KEYBOARD=TTY:/dev/input/event0.
and then I'm execute my program on board.

but keypad is incorrectly working.
If i press '1', there are random values.

so I made Keypad plugin. and then I get a file 'libKeypadPlugin.so'
and I put the file on board.(/usr/lib/qtopia/plugins/keypaddrivers (keypaddirvers i made)
So I think.. IF I set QWS_KEYBOARD=keypad:/dev/input/event0, It will be working correctly.
but my program not recognize my keypadplugin.

so where can i put libKeypadPlugin.so???
(I'm sorry to my english writing).