hacking linux - framebuffer console/i2c keyboard

How would one hack up a i2c keypad interface to appear as a keyboard on a
system, and get messages to stdout appear on an LCD? Specifically, I'm
working on 823e. I have no idea where or how to start. I know each thing
works correctly, that is, I have the i2c keypad and the LCD properly working
on the system. I'm just at a loss on how to tie it all together.

Many thanks in advance!

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