PoC: Frigate + PCIe Coral + ESPCam, Home Assistant, ESPHome, MQTT, zigbee2mqtt

overlays/kernel-modules/default.nix

@@ -0,0 +1,19 @@
+{ config, lib, ... }:
+
+# Adds additional kernel modules to the nixos system
+# Not actually an overlay but a module. Has to be this way because kernel
+# modules are tightly coupled to the kernel version they were built against.
+# https://nixos.wiki/wiki/Linux_kernel
+
+let
+  cfg = config.kernel;
+
+  gasket = config.boot.kernelPackages.callPackage ./gasket.nix { };
+in
+{
+  options.kernel.enableGasketKernelModule = lib.mkEnableOption "Enable Gasket Kernel Module";
+
+  config = lib.mkIf cfg.enableGasketKernelModule {
+    boot.extraModulePackages = [ gasket ];
+  };
+}

overlays/kernel-modules/gasket.nix

@@ -0,0 +1,35 @@
+{ stdenv, lib, fetchFromGitHub, kernel }:
+
+stdenv.mkDerivation rec {
+  pname = "gasket";
+  version = "1.0-18";
+
+  src = fetchFromGitHub {
+    owner = "google";
+    repo = "gasket-driver";
+    rev = "97aeba584efd18983850c36dcf7384b0185284b3";
+    sha256 = "pJwrrI7jVKFts4+bl2xmPIAD01VKFta2SRuElerQnTo=";
+  };
+
+  makeFlags = [
+    "-C"
+    "${kernel.dev}/lib/modules/${kernel.modDirVersion}/build"
+    "M=$(PWD)"
+  ];
+  buildFlags = [ "modules" ];
+
+  installFlags = [ "INSTALL_MOD_PATH=${placeholder "out"}" ];
+  installTargets = [ "modules_install" ];
+
+  sourceRoot = "source/src";
+  hardeningDisable = [ "pic" "format" ];
+  nativeBuildInputs = kernel.moduleBuildDependencies;
+
+  meta = with lib; {
+    description = "The Coral Gasket Driver allows usage of the Coral EdgeTPU on Linux systems.";
+    homepage = "https://github.com/google/gasket-driver";
+    license = licenses.gpl2;
+    maintainers = [ lib.maintainers.kylehendricks ];
+    platforms = platforms.linux;
+  };
+}