Control your device with your TV remote control via HDMI
https://github.com/Pulse-Eight/libcec

libCEC allows you, in combination with the right hardware, to control
your device with your TV remote control utilizing your existing HDMI
cabling.

libCEC is an enabling platform for the CEC bus in HDMI, it allows
developers to interact with other HDMI devices without having to
worry about the communication overhead, handshaking, and the various
ways of sending a message for each vendor.