attempt at enabling touchscreen

nixos/boxes/homescreen/default.nix

@@ -5,6 +5,7 @@
     hostName = "homescreen";
     networkmanager = { enable = true; };
   };
+  hardware.enableRedistributableFirmware = true;
 
   environment.systemPackages = with pkgs; [ neovim htop btop atop ];
 
@@ -18,12 +19,15 @@
 
   hardware.raspberry-pi."4".fkms-3d.enable = true;
 
+  hardware.deviceTree.filter = lib.mkForce "*rpi-*.dtb";
+
   services.xserver = {
     enable = true;
     displayManager.lightdm.enable = true;
     displayManager.autoLogin.enable = true;
     displayManager.autoLogin.user = "kiosk";
     desktopManager.gnome.enable = true;
+    libinput.enable = true;
   };
 
   users = {
@@ -39,6 +43,11 @@
       fsType = "ext4";
       options = [ "noatime" ];
     };
+    "/boot/firmware" = {
+      device = "/dev/disk/by-label/FIRMWARE";
+      fsType = "vfat";
+      options = [ "nofail" "noauto" ];
+    };
   };
   powerManagement.cpuFreqGovernor = lib.mkDefault "powersave";
 
@@ -47,4 +56,17 @@
   time.timeZone = "Europe/London";
   system.stateVersion = "22.05";
 
+  nix = {
+    autoOptimiseStore = true;
+    gc = {
+      automatic = true;
+      dates = "weekly";
+      options = "--delete-older-than 30d";
+    };
+    # Free up to 1GiB whenever there is less than 100MiB left.
+    extraOptions = ''
+      min-free = ${toString (100 * 1024 * 1024)}
+      max-free = ${toString (1024 * 1024 * 1024)}
+    '';
+  };
 }