depot/third_party/nixpkgs/pkgs/os-specific/linux/rtl8821au/default.nix

{ lib, stdenv, fetchFromGitHub, kernel, bc, nukeReferences }:

stdenv.mkDerivation rec {
  pname = "rtl8821au";
  version = "${kernel.version}-unstable-2022-12-22";

  src = fetchFromGitHub {
    owner = "morrownr";
    repo = "8821au-20210708";
    rev = "73f2036bc6c8666555fa453d267d3732392c1e00";
    sha256 = "sha256-wx7xQBCfLu3UWB7ghp8dZ7OB2MFd5i8X0/ygyvW2K50=";
  };

  nativeBuildInputs = [ bc nukeReferences ];
  buildInputs = kernel.moduleBuildDependencies;

  hardeningDisable = [ "pic" "format" ];

  NIX_CFLAGS_COMPILE="-Wno-error=incompatible-pointer-types";

  makeFlags = [
    "ARCH=${stdenv.hostPlatform.linuxArch}"
    "KSRC=${kernel.dev}/lib/modules/${kernel.modDirVersion}/build"
    ("CONFIG_PLATFORM_I386_PC=" + (if stdenv.hostPlatform.isx86 then "y" else "n"))
    ("CONFIG_PLATFORM_ARM_RPI=" + (if (stdenv.hostPlatform.isAarch32 || stdenv.hostPlatform.isAarch64) then "y" else "n"))
  ] ++ lib.optional (stdenv.hostPlatform != stdenv.buildPlatform) [
    "CROSS_COMPILE=${stdenv.cc.targetPrefix}"
  ];

  prePatch = ''
    substituteInPlace ./Makefile \
      --replace /lib/modules/ "${kernel.dev}/lib/modules/" \
      --replace '$(shell uname -r)' "${kernel.modDirVersion}" \
      --replace /sbin/depmod \# \
      --replace '$(MODDESTDIR)' "$out/lib/modules/${kernel.modDirVersion}/kernel/net/wireless/"
  '';

  preInstall = ''
    mkdir -p "$out/lib/modules/${kernel.modDirVersion}/kernel/net/wireless/"
  '';

  postInstall = ''
    nuke-refs $out/lib/modules/*/kernel/net/wireless/*.ko
  '';

  enableParallelBuilding = true;

  meta = with lib; {
    description = "rtl8821AU and rtl8812AU chipset driver with firmware";
    homepage = "https://github.com/morrownr/8821au";
    license = licenses.gpl2Only;
    platforms = lib.platforms.linux;
    maintainers = with maintainers; [ plchldr ];
  };
}