feat: musicpi

flake.nix

@@ -131,6 +131,8 @@
     nixosConfigurations = processConfigurations {
       picard = nixosSystem "x86_64-linux" [ ./hosts/picard/default.nix ]; # TODO
       ds9 = nixosSystem "x86_64-linux" [ ./hosts/ds9/default.nix ]; # TODO
+      wohnzimmerpi = nixosSystem "aarch64-linux" [ ./hosts/musicpi/default.nix ]; # Livingroom pi
+      kuechenpi = nixosSystem "aarch64-linux" [ ./hosts/musicpi/default.nix ]; # Kitchen pi
     };
     darwinConfigurations = processConfigurations {
       daedalus = darwinSystem "aarch64-darwin" [ ./hosts/daedalus/default.nix ]; # TODO 

hosts/musicpi/default.nix

@@ -0,0 +1,55 @@
+{ config, inputs, pkgs, lib, ... }:
+{
+  imports = [
+    "${inputs.nixpkgs}/nixos/modules/installer/sd-card/sd-image-aarch64.nix"
+    #    "${inputs.nixos-hardware}/raspberry-pi/4/default.nix"
+  ];
+  boot.supportedFilesystems = lib.mkForce [ "reiserfs" "vfat" "ext4" ]; # we dont need zfs here
+  documentation.enable = false;
+  documentation.nixos.enable = false;
+  boot = {
+    kernelPackages = lib.mkDefault pkgs.linuxPackages_rpi4;
+    initrd.availableKernelModules = [ "usbhid" "usb_storage" "vc4" ];
+
+    loader = {
+      grub.enable = lib.mkDefault false;
+      generic-extlinux-compatible.enable = lib.mkDefault true;
+    };
+  };
+
+  hardware.deviceTree.filter = "bcm2711-rpi-*.dtb";
+
+  # Required for the Wireless firmware
+  hardware.enableRedistributableFirmware = true;
+
+  nix = {
+    autoOptimiseStore = true;
+    gc = {
+      automatic = true;
+      dates = "weekly";
+      options = "--delete-older-than 30d";
+    };
+    # Free up to 1GiB whenever there is less than 100MiB left.
+    extraOptions = ''
+      min-free = ${toString (100 * 1024 * 1024)}
+      max-free = ${toString (1024 * 1024 * 1024)}
+    '';
+  };
+
+  # Assuming this is installed on top of the disk image.
+  fileSystems = {
+    "/" = {
+      device = "/dev/disk/by-label/NIXOS_SD";
+      fsType = "ext4";
+      options = [ "noatime" ];
+    };
+  };
+
+  ragon.services.ssh.enable = true;
+  ragon.services.agenix.enable = true;
+  ragon.hardware.hifiberry-dac.enable = true;
+  services.shairport-sync = {
+    enable = true;
+    arguments = "-o alsa";
+  };
+}

nixos-modules/hardware/hifiberry-dac.nix

@@ -0,0 +1,53 @@
+{ config, lib, pkgs, ... }:
+let
+  cfg = config.ragon.hardware.hifiberry-dac;
+in
+{
+  options.ragon.hardware.hifiberry-dac.enable = lib.mkEnableOption "Enables hifiberry dac";
+  config = lib.mkIf cfg.enable {
+    hardware.deviceTree = {
+      overlays = [
+        # Equivalent to: https://github.com/raspberrypi/linux/blob/rpi-5.10.y/arch/arm/boot/dts/overlays/hifiberry-dac-overlay.dts
+        {
+          name = "hifiberry-dac-overlay";
+          dtsText = ''
+            // Definitions for HiFiBerry DAC
+            /dts-v1/;
+            /plugin/;
+
+            / {
+              compatible = "brcm,bcm2835";
+
+              fragment@0 {
+                target = <&i2s>;
+                __overlay__ {
+                  status = "okay";
+                };
+              };
+
+              fragment@1 {
+                target-path = "/";
+                __overlay__ {
+                  pcm5102a-codec {
+                    #sound-dai-cells = <0>;
+                    compatible = "ti,pcm5102a";
+                    status = "okay";
+                  };
+                };
+              };
+
+              fragment@2 {
+                target = <&sound>;
+                __overlay__ {
+                  compatible = "hifiberry,hifiberry-dac";
+                  i2s-controller = <&i2s>;
+                  status = "okay";
+                };
+              };
+            };
+          '';
+        }
+      ];
+    };
+  };
+}

nixos-modules/hardware/rpi3.nix

@@ -1,36 +0,0 @@
-{ config, lib, pkgs, ... }:
-let
-  cfg = config.ragon.hardware.rpi3;
-in
-{
-  options.ragon.hardware.rpi3.enable = lib.mkEnableOption "Enables rpi3 quirks";
-  config = lib.mkIf cfg.enable {
-    boot.loader.raspberryPi = {
-      enable = true;
-      version = 3;
-    };
-    boot.extraModprobeConfig = ''
-      options cfg80211 ieee80211_regdom="DE"
-    '';
-    hardware.firmware = [ pkgs.wireless-regdb ];
-    #boot.kernelPackages = pkgs.linux_rpi3;
-    nixpkgs.overlays = [
-      (self: super: {
-        firmwareLinuxNonfree = super.firmwareLinuxNonfree.overrideAttrs (old: {
-          version = "2020-12-18";
-          src = pkgs.fetchgit {
-            url =
-              "https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git";
-            rev = "b79d2396bc630bfd9b4058459d3e82d7c3428599";
-            sha256 = "1rb5b3fzxk5bi6kfqp76q1qszivi0v1kdz1cwj2llp5sd9ns03b5";
-          };
-          outputHash = "1p7vn2hfwca6w69jhw5zq70w44ji8mdnibm1z959aalax6ndy146";
-        });
-      })
-    ];
-    networking.wireless.enable = true;
-    hardware.enableRedistributableFirmware = true;
-    networking.wireless.interfaces = [ "wlan0" ];
-
-  };
-}