nixos/openrgb: init module

nixos/modules/module-list.nix

@@ -455,6 +455,7 @@
   ./services/hardware/lcd.nix
   ./services/hardware/lirc.nix
   ./services/hardware/nvidia-optimus.nix
+  ./services/hardware/openrgb.nix
   ./services/hardware/pcscd.nix
   ./services/hardware/pommed.nix
   ./services/hardware/power-profiles-daemon.nix

nixos/modules/services/hardware/openrgb.nix

@@ -0,0 +1,52 @@
+{ pkgs, lib, config, ... }:
+
+with lib;
+
+let
+  cfg = config.services.hardware.openrgb;
+in {
+  options.services.hardware.openrgb = {
+    enable = mkEnableOption (lib.mdDoc "OpenRGB server");
+
+    package = mkOption {
+      type = types.package;
+      default = pkgs.openrgb;
+      defaultText = literalMD "pkgs.openrgb";
+      description = lib.mdDoc "Set version of openrgb package to use.";
+    };
+
+    motherboard = mkOption {
+      type = types.nullOr (types.enum [ "amd" "intel" ]);
+      default = null;
+      description = lib.mdDoc "CPU family of motherboard. Allows for addition motherboard i2c support.";
+    };
+
+    server.port = mkOption {
+      type = types.port;
+      default = 6742;
+      description = lib.mdDoc "Set server port of openrgb.";
+    };
+
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = [ cfg.package ];
+    services.udev.packages = [ cfg.package ];
+
+    boot.kernelModules = [ "i2c-dev" ]
+     ++ lib.optionals (cfg.motherboard == "amd") [ "i2c-piix" ]
+     ++ lib.optionals (cfg.motherboard == "intel") [ "i2c-i801" ];
+
+    systemd.services.openrgb = {
+      description = "OpenRGB server daemon";
+      wantedBy = [ "multi-user.target" ];
+
+      serviceConfig = {
+        ExecStart = "${cfg.package}/bin/openrgb --server --server-port ${toString cfg.server.port}";
+        Restart = "always";
+      };
+    };
+  };
+
+  meta.maintainers = with lib.maintainers; [ jonringer ];
+}