#+title: Fingerprint Reader
#+setupfile: ../headers

* Fingerprint Reader
My ThinkPad x220 has a fingerprint reader, so this is a plain toggle
rather than something applied unconditionally. Here’s the skeleton of
the =nixos.fingerprint= module.
#+begin_src nix :tangle yes
{
  flake.modules.nixos.fingerprint = {
    <<config>>
  };
}
#+end_src

** Enabling the Reader
Rather than picking a driver myself, I let [[https://github.com/numtide/nixos-facter-modules][nixos-facter]] detect the
reader and wire up the matching driver automatically.
#+name: config
#+begin_src nix
hardware.facter.detected.fingerprint.enable = true;
#+end_src