services: add TLP

services/default.nix

@@ -22,6 +22,7 @@
     ./rss-bridge.nix
     ./sabnzbd.nix
     ./ssh-server.nix
+    ./tlp.nix
     ./transmission.nix
     ./wireguard.nix
   ];

services/tlp.nix

@@ -0,0 +1,22 @@
+# TLP power management
+{ config, lib, ... }:
+let
+  cfg = config.my.services.tlp;
+in
+{
+  options.my.services.tlp = {
+    enable = lib.mkEnableOption "TLP power management configuration";
+  };
+
+  config = lib.mkIf cfg.enable {
+    services.tlp = {
+      enable = true;
+
+      settings = {
+        # Keep charge between 60% and 80% to preserve battery life
+        START_CHARGE_THRESH_BAT0 = 60;
+        STOP_CHARGE_THRESH_BAT0 = 80;
+      };
+    };
+  };
+}