microsoft-surface: add surface-control

microsoft/surface/README.md

@@ -42,7 +42,11 @@ kernel-space driver into events for the HID / input sub-system.
 
 ### DTX, `surface-control`
 
-*TODO*
+#### surface-control
+
+For controlling the performance modes and other aspects of the device, the [`surface-control`](https://github.com/linux-surface/surface-control) tool is included.
+
+To be able to control the performance mode without using `sudo`, add your user to the `surface-control` group.
 
 # ToDo's Not Done
 

microsoft/surface/default.nix

@@ -1,8 +1,7 @@
-{ config, lib, pkgs, ... }:
-{
-  imports = [
-    ./kernel
-    ./firmware
-    ./hardware_configuration.nix
-  ];
+{ config, lib, pkgs, ... }: {
+  imports = [ ./kernel ./firmware ./hardware_configuration.nix ];
+
+  environment.systemPackages = with pkgs; [ surface-control ];
+  users.groups.surface-control = {};
+  services.udev.packages = [ pkgs.surface-control ];
 }