nixos/hardware/bladeRF: init at 2.0.2

This allows to easily enable bladerf-related udev rules with nixos
configuration.

nixos/modules/hardware/bladeRF.nix

@@ -0,0 +1,28 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.hardware.bladeRF;
+
+in
+
+{
+  options.hardware.bladeRF = {
+    enable = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        Enables udev rules for BladeRF devices. By default grants access
+        to users in the "bladerf" group. You may want to install the
+        libbladeRF package.
+      '';
+    };
+
+  };
+
+  config = mkIf cfg.enable {
+    services.udev.packages = [ pkgs.libbladeRF ];
+    users.groups.bladerf = {};
+  };
+}