nix-config/hosts/pi/default.nix

{ config, lib, pkgs, inputs, ... }:

{
  imports = [
    ./hardware-configuration.nix
    ../server.nix
  ];

  networking.hostId = "731d1660";

  hardware = {
    raspberry-pi."4" = {
      apply-overlays-dtmerge.enable = true;
      audio.enable = false;
      fkms-3d.enable = false;
      xhci.enable = false;
    };
    deviceTree = {
      enable = true;
      filter = "*rpi-4-*.dtb";
      overlays = [
        {
          # Adapted from: https://github.com/raspberrypi/linux/blob/rpi-6.1.y/arch/arm/boot/dts/overlays/hifiberry-digi-pro-overlay.dts
          # changes:
          # - modified top-level "compatible" field from bcm2835 to bcm2711
          # - s/i2s_clk_consumer/i2s/ (name on bcm2711 platform)
          name = "hifiberry-digi-pro";
          dtsText = ''
            /dts-v1/;
            /plugin/;

            / {
                compatible = "brcm,bcm2711";

                fragment@0 {
                    target = <&i2s>;
                    __overlay__ {
                        status = "okay";
                    };
                };

                fragment@1 {
                    target = <&i2c1>;
                    __overlay__ {
                        #address-cells = <1>;
                        #size-cells = <0>;
                        status = "okay";

                        wm8804@3b {
                            #sound-dai-cells = <0>;
                            compatible = "wlf,wm8804";
                            reg = <0x3b>;
                            PVDD-supply = <&vdd_3v3_reg>;
                            DVDD-supply = <&vdd_3v3_reg>;
                            status = "okay";
                        };
                    };
                };

                fragment@2 {
                    target = <&sound>;
                    __overlay__ {
                        compatible = "hifiberry,hifiberry-digi";
                        i2s-controller = <&i2s>;
                        status = "okay";
                        clock44-gpio = <&gpio 5 0>;
                        clock48-gpio = <&gpio 6 0>;
                    };
                };
            };
          '';
        }
      ];
    };
    firmware = with pkgs; [
      firmwareLinuxNonfree
      wireless-regdb
    ];
  };

  sound.enable = true;

  security.rtkit.enable = true;
  services.pipewire = {
    enable = true;
    alsa.enable = true;
    alsa.support32Bit = true;
    pulse.enable = true;
  };

  age.secrets."files/services/home-assistant/secrets.yaml" = {
    file = "${inputs.secrets}/files/services/home-assistant/secrets.yaml.age";
    path = "${config.services.home-assistant.configDir}/secrets.yaml";
    owner = "hass";
    group = "hass";
  };

  services.home-assistant = {
    enable = true;
    extraComponents = [
      "api"
      "alert"
      "auth"
      "backup"
      "command_line"
      "default_config"
      "homekit_controller"
      "homekit"
      "http"
      "icloud"
      "jellyfin"
      "metoffice"
      "mqtt"
      "onkyo"
      "ping"
      "proximity"
      "radio_browser"
      "scrape"
      "sensor"
      "system_health"
    ];
    config = {
      default_config = {};
      backup = {};
      homeassistant = {
        name = "Home";
        latitude = "!secret latitude";
        longitude = "!secret longitude";
        country = "GB";
        temperature_unit = "C";
        time_zone = config.time.timeZone;
        unit_system = "metric";
      };
      mqtt = { };
      system_health = { };
      recorder = {
        purge_keep_days = 365;
      };
    };
  };

  services.mosquitto = {
    enable = true;
    listeners = [{
      acl = [ "pattern readwrite #" ];
      omitPasswordAuth = true;
      port = 1883;
      settings = {
        allow_anonymous = true;
      };
    }];
  };

  age.secrets."files/services/zigbee2mqtt/secret.yaml" = {
    file = "${inputs.secrets}/files/services/zigbee2mqtt/secret.yaml.age";
    path = "${config.services.zigbee2mqtt.dataDir}/secret.yaml";
    owner = "zigbee2mqtt";
    group = "zigbee2mqtt";
  };

  services.zigbee2mqtt = {
    enable = true;
    dataDir = "/var/lib/zigbee2mqtt";
    settings = {
      homeassistant = lib.optionalAttrs config.services.home-assistant.enable {
        discovery_topic = "homeassistant";
        status_topic = "hass/status";
        legacy_entity_attributes = true;
        legacy_triggers = true;
      };
      availability = true;
      frontend = true;
      device_options = {
        retain = true;
      };
      serial = {
        port = "/dev/serial/by-id/usb-Silicon_Labs_Sonoff_Zigbee_3.0_USB_Dongle_Plus_0001-if00-port0";
      };
      advanced = {
        channel = 20;
        network_key = "!secret.yaml network_key";
        pan_id = 13001;
        ext_pan_id = [ 79 1 73 47 250 136 124 222 ];
        transmit_power = 20;
      };
      mqtt = {
        version = 5;
        server = "mqtt://localhost:1883";
      };
    };
  };

  modules = {
    networking = {
      wireless = {
        enable = true;
        interfaces = [ "wlan0" ];
      };
    };
    services = {
      borgmatic = {
        enable = true;
        directories = [
          "/var/lib/mosquitto"
          "/var/lib/zigbee2mqtt"
        ];
        repoPath = "ssh://qcw86s11@qcw86s11.repo.borgbase.com/./repo";
      };
    };
  };

  environment.systemPackages = with pkgs; [
    libraspberrypi
    raspberrypi-eeprom
  ];

  system.stateVersion = "22.11";
}