deepcool/nix/kmod.nix

{
  lib,
  stdenv,
  linuxPackages_latest,
  kernel ? linuxPackages_latest.kernel,
  ...
}: let
  pname = "deepcool";
  version = "0.1.0";
in
  stdenv.mkDerivation {
    inherit pname version;

    src = let
      fs = lib.fileset;
      sp = ../.;
    in
      fs.toSource {
        root = sp;
        fileset = fs.unions [
          (sp + /deepcool.c)
          (sp + /Makefile)
        ];
      };

    enableParallelBuilding = true;
    nativeBuildInputs = kernel.moduleBuildDependencies;
    hardeningDisable = ["pic" "format"];

    env = {
      KVERSION = kernel.modDirVersion;
      INSTALL_MOD_PATH = builtins.placeholder "out";
    };

    buildPhase = ''
      runHook preBuild
      echo "Kernel version: $KVERSION"
      make -C ${kernel.dev}/lib/modules/${kernel.modDirVersion}/build \
        M=$(pwd) \
        modules
      runHook postBuild
    '';

    installPhase = ''
      runHook preInstall
      echo "Module Installation Path: $INSTALL_MOD_PATH"
      make -C ${kernel.dev}/lib/modules/${kernel.modDirVersion}/build \
        M=$(pwd) \
        modules_install
      runHook postInstall
    '';

    postInstall = ''
      if [ -d $out/lib/modules/${kernel.modDirVersion}/extra ]; then
        mkdir -p $out/lib/modules/${kernel.modDirVersion}/kernel/drivers/hid
        find $out/lib/modules/${kernel.modDirVersion}/extra -name "*.ko*" \
          -exec mv {} $out/lib/modules/${kernel.modDirVersion}/kernel/drivers/hid/ \;
        rmdir $out/lib/modules/${kernel.modDirVersion}/extra 2>/dev/null || true
      fi
    '';

    passthru = {
      inherit kernel;
      kernelVersion = kernel.modDirVersion;
      moduleName = "deepcool_digital";
      modulePath = "kernel/drivers/hid/deepcool_digital.ko";
    };

    meta = {
      description = "Linux kernel module for Deepcool Digital USB HID devices";
      license = lib.licenses.gpl2Plus;
      maintainers = [];
      platforms = lib.platforms.linux;
      broken = lib.versionOlder kernel.version "5.10";
    };
  }