From 6cbbb9581032bd0923773c2279d3ec4a1685c36e Mon Sep 17 00:00:00 2001
From: Bart van der Braak <bartvdbraak@gmail.com>
Date: Sat, 26 Oct 2024 17:05:52 +0200
Subject: [PATCH] Add out-of-tree kernel module for Motorcomm yt6801 Network
 Interface Card (NIC) driver (#7)

* Add initial test to run with the new driver install

* Fix unpacking by using git source

* Change buildinputs and patch commands

* Working example of extra yt6801 module

* Add fixes

* Consolidate changes
---
 tongfang/nixos/hardware-configuration.nix |  8 ++++-
 tongfang/nixos/yt6801/default.nix         | 43 +++++++++++++++++++++++
 2 files changed, 50 insertions(+), 1 deletion(-)
 create mode 100644 tongfang/nixos/yt6801/default.nix

diff --git a/tongfang/nixos/hardware-configuration.nix b/tongfang/nixos/hardware-configuration.nix
index f10dad2..e84723d 100644
--- a/tongfang/nixos/hardware-configuration.nix
+++ b/tongfang/nixos/hardware-configuration.nix
@@ -3,6 +3,12 @@
 # to /etc/nixos/configuration.nix instead.
 { config, lib, pkgs, modulesPath, ... }:
 
+let
+  yt6801 = import ./yt6801/default.nix {
+    inherit (pkgs) lib stdenv fetchFromGitHub nukeReferences bc;
+    kernel = pkgs.linuxPackages.kernel;
+  };
+in
 {
   imports =
     [ (modulesPath + "/installer/scan/not-detected.nix")
@@ -11,7 +17,7 @@
   boot.initrd.availableKernelModules = [ "nvme" "xhci_pci" "thunderbolt" "usb_storage" "sd_mod" "sdhci_pci" ];
   boot.initrd.kernelModules = [ ];
   boot.kernelModules = [ "kvm-amd" ];
-  boot.extraModulePackages = [ ];
+  boot.extraModulePackages = [ yt6801 ];
 
   fileSystems."/" =
     { device = "/dev/disk/by-uuid/c7cf28c3-5744-45cc-8a81-456d24e44b7a";
diff --git a/tongfang/nixos/yt6801/default.nix b/tongfang/nixos/yt6801/default.nix
new file mode 100644
index 0000000..aaad340
--- /dev/null
+++ b/tongfang/nixos/yt6801/default.nix
@@ -0,0 +1,43 @@
+{ lib, stdenv, fetchFromGitHub, nukeReferences, bc, kernel }:
+
+stdenv.mkDerivation rec {
+  pname = "yt6801";
+  version = "1.0.29";
+  name = "${pname}-${version}-${kernel.version}";
+
+  src = fetchFromGitHub {
+    owner = "bartvdbraak";
+    repo = pname;
+    rev = version;
+    sha256 = "sha256-VEBwcbJcLffIIAP+NIhjiuMkfR+PKybBDnIbxY6zBMA=";
+  };
+
+  patchPhase = ''
+    substituteInPlace ./src/Makefile \
+      --replace-fail 'KSRC_BASE = /lib/modules/$(shell uname -r)' "KSRC_BASE = ${KERNELDIR}"
+  '';
+
+  hardeningDisable = [ "pic" "format" ];
+  KERNELDIR = "${kernel.dev}/lib/modules/${kernel.modDirVersion}";
+  nativeBuildInputs = [ bc ] ++ kernel.moduleBuildDependencies;
+
+  preBuild = "cd src";
+  buildFlags = [ "modules" ];
+
+  makeFlags = [
+    "ARCH=${stdenv.hostPlatform.linuxArch}"
+  ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
+    "CROSS_COMPILE=${stdenv.cc.targetPrefix}"
+  ];
+
+  installFlags = [ "INSTALL_MOD_PATH=${placeholder "out"}" ];
+  enableParallelBuilding = true;
+
+  meta = with lib; {
+    description = "Motorcomm yt6801 Network Interface Card (NIC) driver";
+    homepage = "https://www.motor-comm.com/product/ethernet-control-chip";
+    license = licenses.gpl2Only;
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ bartvdbraak ];
+  };
+}