uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

nixos/modules/services/x11/hardware/cmt.nix

@@ -0,0 +1,59 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+cfg = config.services.xserver.cmt;
+etcPath = "X11/xorg.conf.d";
+
+in {
+
+  options = {
+
+    services.xserver.cmt = {
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Enable chrome multitouch input (cmt). Touchpad drivers that are configured for chromebooks.";
+      };
+      models = mkOption {
+        type = types.enum [ "atlas" "banjo" "candy" "caroline" "cave" "celes" "clapper" "cyan" "daisy" "elan" "elm" "enguarde" "eve" "expresso" "falco" "gandof" "glimmer" "gnawty" "heli" "kevin" "kip" "leon" "lulu" "orco" "pbody" "peppy" "pi" "pit" "puppy" "quawks" "rambi" "samus" "snappy" "spring" "squawks" "swanky" "winky" "wolf" "auron_paine" "auron_yuna" "daisy_skate" "nyan_big" "nyan_blaze" "veyron_jaq" "veyron_jerry" "veyron_mighty" "veyron_minnie" "veyron_speedy" ];
+        example = "banjo";
+        description = ''
+          Which models to enable cmt for. Enter the Code Name for your Chromebook.
+          Code Name can be found at <link xlink:href="https://www.chromium.org/chromium-os/developer-information-for-chrome-os-devices" />.
+        '';
+      };
+    }; #closes services
+  }; #closes options
+
+  config = mkIf cfg.enable {
+
+    services.xserver.modules = [ pkgs.xf86_input_cmt ];
+
+    environment.etc = {
+      "${etcPath}/40-touchpad-cmt.conf" = {
+        source = "${pkgs.chromium-xorg-conf}/40-touchpad-cmt.conf";
+      };
+      "${etcPath}/50-touchpad-cmt-${cfg.models}.conf" = {
+        source = "${pkgs.chromium-xorg-conf}/50-touchpad-cmt-${cfg.models}.conf";
+      };
+      "${etcPath}/60-touchpad-cmt-${cfg.models}.conf" = {
+        source = "${pkgs.chromium-xorg-conf}/60-touchpad-cmt-${cfg.models}.conf";
+      };
+    };
+
+    assertions = [
+      {
+        assertion = !config.services.xserver.libinput.enable;
+        message = ''
+          cmt and libinput are incompatible, meaning you cannot enable them both.
+          To use cmt you need to disable libinput with `services.xserver.libinput.enable = false`
+          If you haven't enabled it in configuration.nix, it's enabled by default on a
+          different xserver module.
+        '';
+      }
+    ];
+  };
+}