msi-ec-kmods: init at 0-unstable-2024-09-19

Adds msi-ec-kmods kernel module for msi embedded controllers.

pkgs/os-specific/linux/msi-ec/default.nix

@@ -0,0 +1,52 @@
+{
+  stdenv,
+  lib,
+  fetchFromGitHub,
+  linuxPackages,
+  kernel ? linuxPackages.kernel,
+}:
+stdenv.mkDerivation {
+  pname = "msi-ec-kmods";
+  version = "0-unstable-2024-09-19";
+
+  src = fetchFromGitHub {
+    owner = "BeardOverflow";
+    repo = "msi-ec";
+    rev = "94c2a45c04a07096e10d7cb1240e1a201a025dc0";
+    hash = "sha256-amJUoIf5Sl62BLyHLeam2fzN1s+APoWh2dH5QVfJhCs=";
+  };
+
+  dontMakeSourcesWritable = false;
+
+  postPatch =
+    let
+      targets = builtins.filter (v: v != "") [
+        (lib.strings.optionalString (kernel.kernelOlder "6.2") "older-kernel-patch")
+        (lib.strings.optionalString (kernel.kernelAtLeast "6.11") "6.11-kernel-patch")
+      ];
+      commands = builtins.map (target: "make ${target}") targets;
+    in
+    lib.concatStringsSep "\n" ([ "cp ${./patches/Makefile} ./Makefile" ] ++ commands);
+
+  hardeningDisable = [ "pic" ];
+
+  makeFlags = kernel.makeFlags ++ [
+    "KERNELDIR=${kernel.dev}/lib/modules/${kernel.modDirVersion}/build"
+    "INSTALL_MOD_PATH=$(out)"
+    "ccflags-y+=-Wno-error=incompatible-pointer-types"
+  ];
+
+  nativeBuildInputs = kernel.moduleBuildDependencies;
+
+  installTargets = [ "modules_install" ];
+
+  enableParallelBuilding = true;
+
+  meta = {
+    description = "Kernel modules for MSI Embedded controller";
+    homepage = "https://github.com/m1dugh/msi-ec";
+    license = lib.licenses.gpl2;
+    maintainers = [ lib.maintainers.m1dugh ];
+    platforms = lib.platforms.linux;
+  };
+}

pkgs/os-specific/linux/msi-ec/patches/Makefile

@@ -0,0 +1,27 @@
+# Out of the box, the build with this Makefile only works in FHS environments,
+# such as on Ubuntu or Debian. On NixOS, you either need to open an FHS
+# environment using a Nix shell or build this from a specially crafted Nix
+# derivation.
+#
+# This file follows the conventions written down here:
+# https://docs.kernel.org/kbuild/modules.html
+# Make it possible to override the kernel src tree location from Nix derivation.
+KERNEL ?= $(shell uname -r)
+KERNELDIR ?= /lib/modules/$(KERNEL)/build/
+ccflags-y := -std=gnu11 -Wno-declaration-after-statement
+.PHONY: default
+default: modules
+# -m: Build as module.
+obj-m = msi-ec.o
+.PHONY: modules
+modules:
+	@#"M=": Module source. Special variable of the kernel's main Makefile.
+	$(MAKE) -C $(KERNELDIR) M=$(PWD) modules
+.PHONY: modules_install
+modules_install:
+	$(MAKE) -C $(KERNELDIR) M=$(PWD) modules_install
+6.11-kernel-patch:
+	git apply 6.11-kernel.patch
+
+older-kernel-patch:
+	git apply older-kernel.patch

pkgs/top-level/linux-kernels.nix

@@ -602,6 +602,8 @@ in {
 
     nullfs = callPackage ../os-specific/linux/nullfs { };
 
+    msi-ec = callPackage ../os-specific/linux/msi-ec { };
+
   } // lib.optionalAttrs config.allowAliases {
     ati_drivers_x11 = throw "ati drivers are no longer supported by any kernel >=4.1"; # added 2021-05-18;
     hid-nintendo = throw "hid-nintendo was added in mainline kernel version 5.16"; # Added 2023-07-30