Merge pull request #164185 from alexshpilkin/calibration

facetimehd: support sensor calibration files

nixos/modules/hardware/all-firmware.nix

···
         b43Firmware_6_30_163_46
         b43FirmwareCutter
         xow_dongle-firmware
-      ] ++ optional pkgs.stdenv.hostPlatform.isx86 facetimehd-firmware;
+      ] ++ optionals pkgs.stdenv.hostPlatform.isx86 [
+        facetimehd-calibration
+        facetimehd-firmware
+      ];
     })
     (mkIf cfg.wirelessRegulatoryDatabase {
       hardware.firmware = [ pkgs.wireless-regdb ];

nixos/modules/hardware/video/webcam/facetimehd.nix

···
 
   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.extraModulePackages = [ kernelPackages.facetimehd ];
 
-    hardware.firmware = [ pkgs.facetimehd-firmware ];
+    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/os-specific/linux/firmware/facetimehd-calibration/default.nix

···
+{ lib, stdenv, fetchurl, unrar-wrapper, pkgs }:
+
+let
+
+  version = "5.1.5769";
+
+
+  # Described on https://github.com/patjak/facetimehd/wiki/Extracting-the-sensor-calibration-files
+
+  # From the wiki page, range extracted with binwalk:
+  zipUrl = "https://download.info.apple.com/Mac_OS_X/031-30890-20150812-ea191174-4130-11e5-a125-930911ba098f/bootcamp${version}.zip";
+  zipRange = "2338085-3492508"; # the whole download is 518MB, this deflate stream is 1.2MB
+
+  # CRC and length from the ZIP entry header (not strictly necessary, but makes it extract cleanly):
+  gzFooter = ''\x51\x1f\x86\x78\xcf\x5b\x12\x00'';
+
+  # Also from the wiki page:
+  calibrationFiles = [
+    { file = "1771_01XX.dat"; offset = "1644880"; size = "19040"; }
+    { file = "1871_01XX.dat"; offset = "1606800"; size = "19040"; }
+    { file = "1874_01XX.dat"; offset = "1625840"; size = "19040"; }
+    { file = "9112_01XX.dat"; offset = "1663920"; size = "33060"; }
+  ];
+
+in
+
+stdenv.mkDerivation {
+
+  pname = "facetimehd-calibration";
+  inherit version;
+  src = fetchurl {
+    url = zipUrl;
+    sha256 = "1dzyv457fp6d8ly29sivqn6llwj5ydygx7p8kzvdnsp11zvid2xi";
+    curlOpts = "-r ${zipRange}";
+  };
+
+  dontUnpack = true;
+  dontInstall = true;
+
+  buildInputs = [ unrar-wrapper ];
+
+  buildPhase = ''
+    { printf '\x1f\x8b\x08\x00\x00\x00\x00\x00\x00\x00'
+      cat $src
+      printf '${gzFooter}'
+    } | zcat > AppleCamera64.exe
+    unrar x AppleCamera64.exe AppleCamera.sys
+
+    mkdir -p $out/lib/firmware/facetimehd
+  '' + lib.concatMapStrings ({file, offset, size}: ''
+    dd bs=1 skip=${offset} count=${size} if=AppleCamera.sys of=$out/lib/firmware/facetimehd/${file}
+  '') calibrationFiles;
+
+  meta = with lib; {
+    description = "facetimehd calibration";
+    homepage = "https://support.apple.com/kb/DL1837";
+    license = licenses.unfree;
+    maintainers = with maintainers; [ womfoo grahamc ];
+    platforms = [ "i686-linux" "x86_64-linux" ];
+  };
+
+}

pkgs/top-level/all-packages.nix

···
 
   extrace = callPackage ../os-specific/linux/extrace { };
 
+  facetimehd-calibration = callPackage ../os-specific/linux/firmware/facetimehd-calibration { };
+
   facetimehd-firmware = callPackage ../os-specific/linux/firmware/facetimehd-firmware { };
 
   fatrace = callPackage ../os-specific/linux/fatrace { };