Merge pull request #12038 from womfoo/facetimehd

facetimehd: PCIe webcam support for Macbooks

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

@@ -0,0 +1,45 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.hardware.facetimehd;
+
+  kernelPackages = config.boot.kernelPackages;
+
+in
+
+{
+
+  options.hardware.facetimehd.enable = mkEnableOption "facetimehd kernel module";
+
+  config = mkIf cfg.enable {
+
+    assertions = singleton {
+      assertion = versionAtLeast kernelPackages.kernel.version "3.19";
+      message = "facetimehd is not supported for kernels older than 3.19";
+    };
+
+    boot.kernelModules = [ "facetimehd" ];
+
+    boot.blacklistedKernelModules = [ "bdc_pci" ];
+
+    boot.extraModulePackages = [ kernelPackages.facetimehd ];
+
+    hardware.firmware = [ pkgs.facetimehd-firmware ];
+
+    # unload module during suspend/hibernate as it crashes the whole system
+    powerManagement.powerDownCommands = ''
+      ${pkgs.module_init_tools}/bin/rmmod -f facetimehd
+    '';
+
+    # and load it back on resume
+    powerManagement.resumeCommands = ''
+      export MODULE_DIR=/run/current-system/kernel-modules/lib/modules
+      ${pkgs.module_init_tools}/bin/modprobe -v facetimehd
+    '';
+
+  };
+
+}

nixos/modules/module-list.nix

@@ -42,6 +42,7 @@
   ./hardware/video/bumblebee.nix
   ./hardware/video/nvidia.nix
   ./hardware/video/ati.nix
+  ./hardware/video/webcam/facetimehd.nix
   ./installer/tools/auto-upgrade.nix
   ./installer/tools/nixos-checkout.nix
   ./installer/tools/tools.nix

pkgs/os-specific/linux/facetimehd/default.nix

@@ -0,0 +1,34 @@
+{ stdenv, fetchFromGitHub, kernel }:
+
+# facetimehd is not supported for kernels older than 3.19";
+assert stdenv.lib.versionAtLeast kernel.version "3.19";
+
+stdenv.mkDerivation rec {
+
+  name = "facetimehd-${version}-${kernel.version}";
+  version = "git-20160127";
+
+  src = fetchFromGitHub {
+    owner = "patjak";
+    repo = "bcwc_pcie";
+    rev = "186e9f9101ed9bbd7cc8d470f840d4a74c585ca7";
+    sha256 = "1frsf6z6v94cz9fww9rbnk926jzl36fp3w2d1aw6djhzwm80a5gs";
+  };
+
+  preConfigure = ''
+    export INSTALL_MOD_PATH="$out"
+  '';
+
+  makeFlags = [
+    "KDIR=${kernel.dev}/lib/modules/${kernel.modDirVersion}/build"
+  ];
+
+  meta = with stdenv.lib; {
+    homepage = https://github.com/patjak/bcwc_pcie;
+    description = "Linux driver for the Facetime HD (Broadcom 1570) PCIe webcam";
+    license = licenses.gpl2;
+    maintainers = [ maintainers.womfoo ];
+    platforms = platforms.linux;
+  };
+
+}

pkgs/os-specific/linux/firmware/facetimehd-firmware/default.nix

@@ -0,0 +1,51 @@
+{ stdenv, fetchurl, cpio, xz, pkgs }:
+
+let
+
+  version = "1.43";
+
+  dmgRange = "420107885-421933300"; # the whole download is 1.3GB, this cuts it down to 2MB
+
+  firmwareIn = "./System/Library/Extensions/AppleCameraInterface.kext/Contents/MacOS/AppleCameraInterface";
+  firmwareOut = "firmware.bin";
+  firmwareOffset = "81920";
+  firmwareSize = "603715";
+
+  # separated this here as the script will fail without the 'exit 0'
+  unpack = pkgs.writeScriptBin "unpack" ''
+    xzcat -Q $src | cpio --format odc -i -d ${firmwareIn}
+    exit 0
+  '';
+
+in
+
+stdenv.mkDerivation {
+
+  name = "facetimehd-firmware-${version}";
+
+  src = fetchurl {
+    url = "https://support.apple.com/downloads/DL1849/en_US/osxupd10.11.2.dmg";
+    sha256 = "1jw6sy9vj27amfak83cs2c7q856y4mk1wix3rl4q10yvd9bl4k9x";
+    curlOpts = "-r ${dmgRange}";
+  };
+
+  phases = [ "buildPhase" ];
+
+  buildInputs = [ cpio xz ];
+
+  buildPhase = ''
+    ${unpack}/bin/unpack
+    dd bs=1 skip=${firmwareOffset} count=${firmwareSize} if=${firmwareIn} of=${firmwareOut}.gz &> /dev/null
+    mkdir -p $out/lib/firmware/facetimehd
+    gunzip -c ${firmwareOut}.gz > $out/lib/firmware/facetimehd/${firmwareOut}
+  '';
+
+  meta = with stdenv.lib; {
+    description = "facetimehd firmware";
+    homepage = https://support.apple.com/downloads/DL1849;
+    license = licenses.unfree;
+    maintainers = [ maintainers.womfoo ];
+    platforms = platforms.linux;
+  };
+
+}

pkgs/top-level/all-packages.nix

@@ -9999,6 +9999,8 @@ let
 
   eject = utillinux;
 
+  facetimehd-firmware = callPackage ../os-specific/linux/firmware/facetimehd-firmware { };
+
   fanctl = callPackage ../os-specific/linux/fanctl {
     iproute = iproute.override { enableFan = true; };
   };
@@ -10322,6 +10324,8 @@ let
 
     openafsClient = callPackage ../servers/openafs-client { };
 
+    facetimehd = callPackage ../os-specific/linux/facetimehd { };
+
     kernelHeaders = callPackage ../os-specific/linux/kernel-headers { };
 
     klibc = callPackage ../os-specific/linux/klibc { };