nixos/auto-cpufreq: init module

nixos/modules/module-list.nix

@@ -356,6 +356,7 @@
   ./services/games/terraria.nix
   ./services/hardware/acpid.nix
   ./services/hardware/actkbd.nix
+  ./services/hardware/auto-cpufreq.nix
   ./services/hardware/bluetooth.nix
   ./services/hardware/bolt.nix
   ./services/hardware/brltty.nix

nixos/modules/services/hardware/auto-cpufreq.nix

@@ -0,0 +1,18 @@
+{ config, lib, pkgs, ... }:
+with lib;
+let
+  cfg = config.services.auto-cpufreq;
+in {
+  options = {
+    services.auto-cpufreq = {
+      enable = mkEnableOption "auto-cpufreq daemon";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = [ pkgs.auto-cpufreq ];
+
+    systemd.packages = [ pkgs.auto-cpufreq ];
+    systemd.services.auto-cpufreq.path = with pkgs; [ bash coreutils ];
+  };
+}