{ config, pkgs, lib, ... }:
with lib;
let
  cfg = config.hardware.wirelessRegulatoryDomain;
in {
  options.hardware.wirelessRegulatoryDomain = mkOption {
    description = "The wireless regulatory domain to set in the kernel cfg80211 module";
    type = with types; nullOr str;
    default = null;
    defaultText = literalExpression "null";
    example = literalExpression "\"US\"";
  };

  config.boot.extraModprobeConfig = mkIf (cfg != null) ''
    options cfg80211 ieee80211_regdom=${cfg}
  '';
}