modules: hardware: put modules into folders

modules/hardware/sound/default.nix

@@ -0,0 +1,67 @@
+{ config, lib, ... }:
+let
+  cfg = config.my.hardware.sound;
+in
+{
+  options.my.hardware.sound = with lib; {
+    pipewire = {
+      enable = mkEnableOption "pipewire configuration";
+    };
+
+    pulse = {
+      enable = mkEnableOption "pulseaudio configuration";
+    };
+  };
+
+  config = (lib.mkMerge [
+    # Sanity check
+    {
+      assertions = [
+        {
+          assertion = builtins.all (lib.id) [
+            (cfg.pipewire.enable -> !cfg.pulse.enable)
+            (cfg.pulse.enable -> !cfg.pipewire.enable)
+          ];
+          message = ''
+            `config.my.hardware.sound.pipewire.enable` and
+            `config.my.hardware.sound.pulse.enable` are incompatible.
+          '';
+        }
+      ];
+    }
+
+    (lib.mkIf cfg.pipewire.enable {
+      # RealtimeKit is recommended
+      security.rtkit.enable = true;
+
+      services.pipewire = {
+        enable = true;
+
+        alsa = {
+          enable = true;
+          support32Bit = true;
+        };
+
+        pulse = {
+          enable = true;
+        };
+
+        jack = {
+          enable = true;
+        };
+
+        media-session = {
+          enable = true;
+        };
+      };
+    })
+
+    # Pulseaudio setup
+    (lib.mkIf cfg.pulse.enable {
+      # ALSA
+      sound.enable = true;
+
+      hardware.pulseaudio.enable = true;
+    })
+  ]);
+}