If the device does not support a keyboard map,
input-kbd just lists the keys and buttons supported by the device,
like this (for a mouse):
bits: BTN_LEFT
bits: BTN_RIGHT
bits: BTN_MIDDLE
OPTIONS
devnr
The index of the input device to use (0 for /dev/input/event0 and so on).
-ffile
Read a keyboard map from a file and reconfigure the device with this map.
The map file uses the same format as the output of this command.
Key names are also accepted instead of keycodes, like this: