Modules: separated hosts-specific modules in new dir

hostsModules/laptop/nixos/battery.nix

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+# https://discourse.nixos.org/t/what-is-the-best-option-for-power-management/63406/2
+{...}:
+# we just activate tlp unconditonally
+#let
+#  cfg = config.custom;
+#hasBattery =
+#    lib.any (x: lib.strings.hasPrefix "BAT" x)
+#    (builtins.attrNames (builtins.readDir "/sys/class/power_supply"));
+#in
+{
+  #  options.custom = {
+  #     battery.enable = lib.mkOption {
+  #     default = hasBattery;
+  #     description = "Enable better battery support";
+  #     type = lib.types.bool;
+  #    };
+  #  };
+
+  #  config = lib.mkIf cfg.battery.enable {
+  powerManagement.powertop.enable = true; # enable powertop auto tuning on startup.
+  services.system76-scheduler.settings.cfsProfiles.enable = true; # Better scheduling for CPU cycles - thanks System76!!!
+  services.thermald.enable = true; # Enable thermald, the temperature management daemon. (only necessary if on Intel CPUs)
+  services.power-profiles-daemon.enable = false; # Disable GNOMEs power management
+  services.tlp = {
+    enable = true; # Enable TLP (better than gnomes internal power manager)
+    settings = {
+      CPU_BOOST_ON_AC = 1;
+      CPU_BOOST_ON_BAT = 1;
+      CPU_HWP_DYN_BOOST_ON_AC = 1;
+      CPU_HWP_DYN_BOOST_ON_BAT = 1;
+      CPU_SCALING_GOVERNOR_ON_AC = "performance";
+      CPU_SCALING_GOVERNOR_ON_BAT = "powersave";
+      CPU_ENERGY_PERF_POLICY_ON_AC = "performance";
+      CPU_ENERGY_PERF_POLICY_ON_BAT = "balance_power";
+      PLATFORM_PROFILE_ON_AC = "performance";
+      PLATFORM_PROFILE_ON_BAT = "balanced";
+      START_CHARGE_THRESH_BAT1 = 75;
+      STOP_CHARGE_THRESH_BAT1 = 85;
+    };
+  };
+  #  };
+}

hostsModules/laptop/nixos/udev.nix

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+{
+  config,
+  pkgs,
+  ...
+}: {
+  # udev with only the necessary rules. See udev.nix to get all the rules
+  services.udev.extraRules = ''
+    # adapted from here https://wiki.nixos.org/wiki/Keychron_M6
+    KERNEL=="hidraw*", SUBSYSTEM=="hidraw", ATTRS{idVendor}=="32ac", MODE="0660", GROUP="users", TAG+="uaccess"
+
+
+    # taken from here
+    SUBSYSTEMS=="usb", ATTRS{idVendor}=="32ac", ATTRS{idProduct}=="0013", TAG+="uaccess"
+    SUBSYSTEMS=="usb", ATTRS{idVendor}=="32ac", ATTRS{idProduct}=="0018", TAG+="uaccess"
+  '';
+}