nixos/libjaylink: init module

By enabling this module, the jlink system group is created and udev
rules from the libjaylink package are enabled. Read-/Write access is
granted to the members of the jlink group and to seat sessions.

Signed-off-by: Felix Singer <felixsinger@posteo.net>

nixos/modules/hardware/libjaylink.nix

@@ -0,0 +1,27 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+let
+  cfg = config.hardware.libjaylink;
+in
+{
+  options.hardware.libjaylink = {
+    enable = lib.mkEnableOption ''
+      udev rules for devices supported by libjaylink.
+      Add users to the `jlink` group in order to grant
+      them access
+    '';
+    package = lib.mkPackageOption pkgs "libjaylink" { };
+  };
+
+  config = lib.mkIf cfg.enable {
+    users.groups.jlink = { };
+    services.udev.packages = [ cfg.package ];
+  };
+
+  meta.maintainers = with lib.maintainers; [ felixsinger ];
+}

nixos/modules/module-list.nix

@@ -80,6 +80,7 @@
   ./hardware/ksm.nix
   ./hardware/ledger.nix
   ./hardware/libftdi.nix
+  ./hardware/libjaylink.nix
   ./hardware/logitech.nix
   ./hardware/mcelog.nix
   ./hardware/network/ath-user-regd.nix