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/hardware/video/webcam/facetimehd.nix

@@ -0,0 +1,52 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.hardware.facetimehd;
+
+  kernelPackages = config.boot.kernelPackages;
+
+in
+
+{
+
+  options.hardware.facetimehd.enable = mkEnableOption "facetimehd kernel module";
+
+  options.hardware.facetimehd.withCalibration = mkOption {
+    default = false;
+    example = true;
+    type = types.bool;
+    description = ''
+      Whether to include sensor calibration files for facetimehd.
+      This makes colors look much better but is experimental, see
+      <link xlink:href="https://github.com/patjak/facetimehd/wiki/Extracting-the-sensor-calibration-files"/>
+      for details.
+    '';
+  };
+
+  config = mkIf cfg.enable {
+
+    boot.kernelModules = [ "facetimehd" ];
+
+    boot.blacklistedKernelModules = [ "bdc_pci" ];
+
+    boot.extraModulePackages = [ kernelPackages.facetimehd ];
+
+    hardware.firmware = [ pkgs.facetimehd-firmware ]
+      ++ optional cfg.withCalibration pkgs.facetimehd-calibration;
+
+    # unload module during suspend/hibernate as it crashes the whole system
+    powerManagement.powerDownCommands = ''
+      ${pkgs.kmod}/bin/lsmod | ${pkgs.gnugrep}/bin/grep -q "^facetimehd" && ${pkgs.kmod}/bin/rmmod -f -v facetimehd
+    '';
+
+    # and load it back on resume
+    powerManagement.resumeCommands = ''
+      ${pkgs.kmod}/bin/modprobe -v facetimehd
+    '';
+
+  };
+
+}