infrastructure

configuration.nix

@@ -1,8 +1,6 @@
-{ stable, config, pkgs, lib, ... }:
+{ hardware, stable, config, pkgs, lib, ... }:
 
 let
-  SSID = "mywifi";
-  SSIDpassword = "mypassword";
   interface = "wlan0";
   hostname = "nixpi";
 in {
@@ -23,6 +21,47 @@ in {
     LC_TIME = "de_DE.UTF-8";
   };
 
+
+  services.xserver = {
+    enable = true;
+#    displayManager.lightdm.enable = true;
+#    desktopManager.gnome.enable = true;
+    videoDrivers = [ "fbdev" ];
+  };
+
+  sound.enable = true;
+  hardware.pulseaudio.enable = true;
+
+  # Create gpio group
+  users.groups.gpio = {};
+
+  # Change permissions gpio devices
+  services.udev.extraRules = ''
+    SUBSYSTEM=="bcm2835-gpiomem", KERNEL=="gpiomem", GROUP="gpio",MODE="0660"
+    SUBSYSTEM=="gpio", KERNEL=="gpiochip*", ACTION=="add", RUN+="${pkgs.bash}/bin/bash -c 'chown root:gpio  /sys/class/gpio/export /sys/class/gpio/unexport ; chmod 220 /sys/class/gpio/export /sys/class/gpio/unexport'"
+    SUBSYSTEM=="gpio", KERNEL=="gpio*", ACTION=="add",RUN+="${pkgs.bash}/bin/bash -c 'chown root:gpio /sys%p/active_low /sys%p/direction /sys%p/edge /sys%p/value ; chmod 660 /sys%p/active_low /sys%p/direction /sys%p/edge /sys%p/value'"
+    SUBSYSTEM=="spidev", KERNEL=="spidev0.0", GROUP="spi", MODE="0660"
+  '';
+
+  hardware = {
+    raspberry-pi."4" = {
+#      audio.enable = true;
+      apply-overlays-dtmerge.enable = true;
+    };
+    deviceTree = {
+      enable = true;
+      filter = "*rpi-4-*.dtb";
+      overlays = [
+        {
+          name = "spi";
+          dtboFile = ./spi0-0cs.dtbo;
+        }
+      ];
+    };
+  };
+
+  users.groups.spi = {};
+
  console.keyMap = "de";
 
   services.xserver = {
@@ -52,7 +91,8 @@ in {
     hostName = hostname;
     wireless = {
       enable = true;
-#      networks."${SSID}".psk = SSIDpassword;
+      userControlled.enable = false;
+      networks = (import ./networks.nix);
       interfaces = [ interface ];
     };
   };
@@ -66,7 +106,8 @@ in {
       shell = pkgs.xonsh;
       isNormalUser = true;
       hashedPassword = "$y$j9T$ODBtPwWjIx50Bjhctw9kW/$jhfsHaAyh8zOXBV7cCK9l2M0yWyE3VLiL0h55XXV5J2";
-      extraGroups = [ "wheel" ];
+      extraGroups = [ "wheel" "gpio" "spi" "dialout" ];
+      openssh.authorizedKeys.keys = (import ./authorizedKeys.nix);
     };
   };
 
@@ -83,7 +124,9 @@ in {
     git-lfs
     lm_sensors
     file
+    (writeShellScriptBin "silent-add" "git add --intent-to-add $@ ; git update-index --assume-unchanged $@")
     raspberrypi-eeprom
+    libraspberrypi
   ];
 
   nix.settings.experimental-features = [ "nix-command" "flakes" ];

flake.lock

@@ -64,6 +64,22 @@
         "type": "github"
       }
     },
+    "nixos-hardware": {
+      "locked": {
+        "lastModified": 1706182238,
+        "narHash": "sha256-Ti7CerGydU7xyrP/ow85lHsOpf+XMx98kQnPoQCSi1g=",
+        "owner": "NixOS",
+        "repo": "nixos-hardware",
+        "rev": "f84eaffc35d1a655e84749228cde19922fcf55f1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "master",
+        "repo": "nixos-hardware",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1703013332,
@@ -115,6 +131,7 @@
     "root": {
       "inputs": {
         "agenix": "agenix",
+        "nixos-hardware": "nixos-hardware",
         "nixpkgs": "nixpkgs_2",
         "nixpkgs-stable": "nixpkgs-stable"
       }

flake.nix

@@ -1,4 +1,3 @@
-# /etc/nixos/flake.nix
 {
   description = "flake for a remote display on a raspi";
 
@@ -6,9 +5,10 @@
     nixpkgs.url = "github:nixos/nixpkgs?ref=nixpkgs-unstable";
     nixpkgs-stable.url = "github:NixOS/nixpkgs/nixos-23.11";
     agenix.url = "github:ryantm/agenix";
+    nixos-hardware.url = "github:NixOS/nixos-hardware/master";
   };
 
-  outputs = {nixpkgs, nixpkgs-stable, agenix, ...} @ inputs: let
+  outputs = {nixpkgs, nixpkgs-stable, agenix, nixos-hardware, ...} @ inputs: let
     system = "aarch64-linux";
     stable = import nixpkgs-stable { inherit system; config.allowUnfree = true; };
   in {
@@ -17,6 +17,7 @@
       specialArgs = { inherit inputs stable; };
       modules = [
         ./configuration.nix
+        nixos-hardware.nixosModules.raspberry-pi-4
         agenix.nixosModules.default
       ];
     };