Which keycodes are which keys?

[Zazcallabah]

I'm using this with my custom layout and it is working fine except for one thing. My layout doesn't move the + and = keys, so when for example I try to resize text it triggers the wrong keys.

I'm thinking I could fix this by just removing the proper lines in the large switch-case, but I don't know how to figure out which keys map to which key codes?

[tbocek]

you can check the keycodes with sudo showkey --scancodes

[Zazcallabah]

Thanks! :)
Removed the lines and now I think it works the way I want.