tlp.nix

{ config, lib, pkgs, ... }:
with lib;
let
  cfg = config.services.tlp;
  enableRDW = config.networking.networkmanager.enable;
  tlp = pkgs.tlp.override {
    inherit enableRDW;
  };
  mkConfigOption = opt: val: "${opt}=${val}\n";
  mkConfigString = opt: val: mkConfigOption opt "\"${val}\"";
  mkConfigBool = opt: val: if val == false then mkConfigOption opt 0 else mkConfigOption opt 1;
  mkConfigList = opt: val: mkConfigOption opt (concatStringsSep " " val);
in
{
  ###### interface
  options = {
    services.tlp = {
      enable = mkOption {
        type = types.bool;
        default = false;
        description = "Whether to enable the TLP power management daemon.";
      };

      extraConfig = mkOption {
        type = types.lines;
        default = "";
        description = "Additional configuration variables for TLP";
      };
    };
  };

  ###### implementation
  config = mkIf cfg.enable {
    boot.kernelModules = [ "msr" ];

    environment.etc = {
      "tlp.conf".source = extraConfig;
    } // optionalAttrs enableRDW {
      "NetworkManager/dispatcher.d/99tlp-rdw-nm".source = "${tlp}/etc/NetworkManager/dispatcher.d/99tlp-rdw-nm";
    };

    environment.systemPackages = [ tlp ];

    # FIXME: When the config is parametrized we need to move these into a
    # conditional on the relevant options being enabled.
    powerManagement = {
      scsiLinkPolicy = null;
      cpuFreqGovernor = null;
      cpufreq.max = null;
      cpufreq.min = null;
    };

    services.udev.packages = [ tlp ];

    systemd = {
      packages = [ tlp ];
      sockets.systemd-rfkill.enable = false;
      services.systemd-rfkill.enable = false;
    };
  };
}