Starting work on fan control with opencode

modules/nixos/default.nix

@@ -5,5 +5,6 @@
       # ./programs
       ./services
       ./filesystem
+      ./services/systemd
     ];
 }

modules/nixos/services/systemd/fancontrol.nix

@@ -0,0 +1,37 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.systemd-fancon;
+in
+{
+  options.services.systemd-fancon = {
+    enable = mkEnableOption "systemd-fancon service for fan control";
+    config = mkOption {
+      type = types.lines;
+      default = "";
+      description = "Configuration for systemd-fancon.";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = with pkgs; [
+      systemd-fancon
+      lm_sensors
+    ];
+
+    boot.kernelModules = [ "amdgpu" ];
+
+    systemd.services.systemd-fancon = {
+      description = "systemd-fancon service";
+      wantedBy = [ "multi-user.target" ];
+      after = [ "network-online.target" ];
+      serviceConfig = {
+        ExecStart = "${pkgs.systemd-fancon}/bin/systemd-fancon -c ${cfg.configFile}";
+        Restart = "on-failure";
+      };
+      configFile = pkgs.writeText "systemd-fancon.conf" cfg.config;
+    };
+  };
+}