🚀 enable asus touchpad numpad

hosts/nixos-laptop/default.nix

@@ -2,7 +2,7 @@
 # your system.  Help is available in the configuration.nix(5) man page
 # and in the NixOS manual (accessible by running ‘nixos-help’).
 
-{ config, pkgs, ... }:
+{ config, pkgs, inputs, ... }:
 
 {
   imports = [
@@ -78,6 +78,32 @@
     script = "${batteryLevelSufficient}/bin/battery-level-sufficient";
   };
 
+  # Trackpad
+  # i2c for https://github.com/mohamed-badaoui/asus-touchpad-numpad-driver
+  hardware.i2c.enable = true;
+  systemd.services.asus-touchpad-numpad = {
+    description =
+      "Activate Numpad inside the touchpad with top right corner switch";
+    documentation =
+      [ "https://github.com/mohamed-badaoui/asus-touchpad-numpad-driver" ];
+    path = [ pkgs.i2c-tools ];
+    script = ''
+      cd ${inputs.asus-touchpad-numpad-driver}
+      # In the last argument here you choose your layout.
+      ${
+        pkgs.python3.withPackages (ps: [ ps.libevdev ])
+      }/bin/python asus_touchpad.py m433ia
+    '';
+    # Probably needed because it fails on boot seemingly because the driver
+    # is not ready yet. Alternativly, you can use `sleep 3` or similar in the
+    # `script`.
+    serviceConfig = {
+      RestartSec = "1s";
+      Restart = "on-failure";
+    };
+    wantedBy = [ "multi-user.target" ];
+  };
+
   # This value determines the NixOS release from which the default
   # settings for stateful data, like file locations and database versions
   # on your system were taken. It‘s perfectly fine and recommended to leave