From 00330b4102f2f89bea6782abf9669341bf11dcf3 Mon Sep 17 00:00:00 2001
From: Quentin Boyer <quentin+dev@familleboyer.net>
Date: Sat, 27 Jul 2024 21:56:35 +0200
Subject: [PATCH] hostconfig/minus: Add the CEC environnement

---
 hostconfig/minus/nixos.nix | 46 +++++++++++++++++++++++++++++++-----
 pkgs/default.nix           |  1 +
 pkgs/pulse8-cec.nix        | 48 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 89 insertions(+), 6 deletions(-)
 create mode 100644 pkgs/pulse8-cec.nix

diff --git a/hostconfig/minus/nixos.nix b/hostconfig/minus/nixos.nix
index f9ec84c..4896a33 100644
--- a/hostconfig/minus/nixos.nix
+++ b/hostconfig/minus/nixos.nix
@@ -1,5 +1,13 @@
-{ config, pkgs, ... }:
 {
+  config,
+  pkgs,
+  lib,
+  ...
+}:
+{
+  boot.extraModulePackages = [
+    (pkgs.pulse8-cec.override { inherit (config.boot.kernelPackages) kernel; })
+  ];
   boot.loader.systemd-boot.enable = true;
   boot.loader.efi.canTouchEfiVariables = true;
 
@@ -28,7 +36,6 @@
     xkbVariant = "dvp";
   };
 
-  sound.enable = true;
   hardware.pulseaudio.enable = false;
   security.rtkit.enable = true;
   services.pipewire = {
@@ -53,10 +60,37 @@
     enable = true;
   };
 
-  environment.systemPackages = [
-    pkgs.moonlight-qt
-    pkgs.jstest-gtk
-    (pkgs.kodi.withPackages (
+  services.udev.extraRules = ''
+    SUBSYSTEM=="tty" ACTION=="add" \
+      ATTRS{manufacturer}=="Pulse-Eight" ATTRS{product}=="CEC Adapter" \
+      TAG+="systemd" ENV{SYSTEMD_WANTS}="pulse8-cec-attach@$devnode.service"
+  '';
+
+  systemd.services."pulse8-cec-attach@" = {
+    description = "Configure USB Pulse-Eight serial device at %I";
+
+    unitConfig = {
+      ConditionPathExists = "%I";
+    };
+
+    serviceConfig =
+      let
+        systemdLinuxConsoleTools = pkgs.linuxConsoleTools.overrideAttrs (oa: {
+          makeFlags = oa.makeFlags ++ [ "SYSTEMD_SUPPORT=1" ];
+          buildInputs = oa.buildInputs ++ (with pkgs; [ systemdLibs ]);
+        });
+      in
+      {
+        Type = "forking";
+        ExecStart = "${lib.getExe' systemdLinuxConsoleTools "inputattach"} --daemon --pulse8-cec %I";
+      };
+  };
+
+  environment.systemPackages = with pkgs; [
+    moonlight-qt
+    jstest-gtk
+    libcec
+    (kodi.withPackages (
       p: with p; [
         jellyfin
         youtube
diff --git a/pkgs/default.nix b/pkgs/default.nix
index 90c713c..6bc7416 100644
--- a/pkgs/default.nix
+++ b/pkgs/default.nix
@@ -26,6 +26,7 @@
         flex-launcher = pkgs.callPackage ./flex-launcher.nix { };
         mesonlsp = pkgs.callPackage ./mesonlsp { };
         push-to-talk = pkgs.callPackage ./push-to-talk.nix { };
+        pulse8-cec = pkgs.callPackage ./pulse8-cec.nix { };
       };
     };
 }
diff --git a/pkgs/pulse8-cec.nix b/pkgs/pulse8-cec.nix
new file mode 100644
index 0000000..58715ad
--- /dev/null
+++ b/pkgs/pulse8-cec.nix
@@ -0,0 +1,48 @@
+{
+  stdenv,
+  lib,
+  linuxPackages,
+  kernel ? linuxPackages.kernel,
+}:
+stdenv.mkDerivation {
+  pname = "pulse8-cec-module";
+  inherit (kernel)
+    src
+    version
+    postPatch
+    nativeBuildInputs
+    ;
+
+  kernel_dev = kernel.dev;
+  kernelVersion = kernel.modDirVersion;
+
+  modulePath = "drivers/media/cec/usb/pulse8";
+
+  buildPhase = ''
+    BUILT_KERNEL=$kernel_dev/lib/modules/$kernelVersion/build
+
+    cp $BUILT_KERNEL/Module.symvers .
+    cat $BUILT_KERNEL/.config >.config
+    cp $kernel_dev/vmlinux .
+
+    ./scripts/config --enable CONFIG_MEDIA_CEC_SUPPORT
+    ./scripts/config --module CONFIG_USB_PULSE8_CEC
+
+    make "-j$NIX_BUILD_CORES" modules_prepare
+    make "-j$NIX_BUILD_CORES" M=$modulePath modules
+  '';
+
+  installPhase = ''
+    make \
+      INSTALL_MOD_PATH="$out" \
+      XZ="xz -T$NIX_BUILD_CORES" \
+      M="$modulePath" \
+      modules_install
+  '';
+
+  meta = {
+    description = "Pulse 8 CEC kernel module";
+    license = lib.licenses.gpl2;
+  };
+
+}