Add support for DisplayLink docks at work.

nix/configuration/configuration.nix

@@ -28,6 +28,7 @@ in
     ./roles/d2
     ./roles/direnv
     ./roles/disko
+    ./roles/displaylink
     ./roles/distributed_build
     ./roles/doas
     ./roles/docker

nix/configuration/hosts/odowork/default.nix

@@ -92,6 +92,7 @@
     me.chromium.enable = true;
     me.d2.enable = true;
     me.direnv.enable = true;
+    me.displaylink.enable = true;
     me.doas.enable = true;
     me.docker.enable = false;
     me.dont_use_substituters.enable = true;

nix/configuration/roles/displaylink/default.nix

@@ -0,0 +1,40 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+{
+  imports = [ ];
+
+  options.me = {
+    displaylink.enable = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      example = true;
+      description = "Whether we want to install displaylink.";
+    };
+  };
+
+  config = lib.mkIf config.me.displaylink.enable (
+    lib.mkMerge [
+      {
+        environment.systemPackages = with pkgs; [
+          displaylink
+        ];
+
+        allowedUnfree = [ "displaylink" ];
+
+        boot = {
+          extraModulePackages = [ config.boot.kernelPackages.evdi ];
+          initrd.kernelModules = [
+            "evdi"
+          ];
+        };
+      }
+      (lib.mkIf config.me.graphical {
+      })
+    ]
+  );
+}