move regulatory.db to wlan module

devices/gl-ar750/default.nix

@@ -58,7 +58,6 @@
         phases = ["installPhase"];
         installPhase = ''
           mkdir -p $out/ath10k/QCA9887/hw1.0/
-          cp ${pkgs.wireless-regdb}/lib/firmware/regulatory.db* $out/
           blobdir=${firmwareBlobs}/QCA9887/hw1.0
           cp $blobdir/10.2.4-1.0/firmware-5.bin_10.2.4-1.0-00047 $out/ath10k/QCA9887/hw1.0/firmware-5.bin
           cp $blobdir/board.bin  $out/ath10k/QCA9887/hw1.0/
@@ -120,7 +119,6 @@
       filesystem = dir {
         lib = dir {
           firmware = dir {
-            "regulatory.db" = symlink "${firmware}/regulatory.db";
             ath10k = dir {
               QCA9887 = symlink "${firmware}/ath10k/QCA9887";
               "cal-pci-0000:00:00.0.bin" = symlink "${ath10k_cal_data}/.outputs/data";

devices/gl-mt300a/default.nix

@@ -13,8 +13,8 @@
 
   description = ''
     WiFi on this device is provided by the rt2800soc module. It
-    expects firmware to be present in the "???" MTD partition, so -
-    assuming we want to use the wireless - we need to build MTD
+    expects firmware to be present in the "factory" MTD partition, so
+    - assuming we want to use the wireless - we need to build MTD
     support into the kernel even if we're using TFTP root
   '';
 

modules/wlan.nix

@@ -2,9 +2,24 @@
 let
   inherit (lib) mkEnableOption mkOption types isDerivation hasAttr ;
   inherit (pkgs.pseudofile) dir symlink;
-  inherit (pkgs) busybox;
+  inherit (pkgs) stdenv busybox wireless-regdb;
+  regulatory = stdenv.mkDerivation {
+    name = "regulatory.db";
+    phases = ["installPhase"];
+    installPhase = ''
+      mkdir -p $out
+      cp ${wireless-regdb}/lib/firmware/regulatory.db $out/
+    '';
+  };
 in {
   config = {
+    filesystem = dir {
+      lib = dir {
+        firmware = dir {
+          "regulatory.db" = symlink "${regulatory}/regulatory.db";
+        };
+      };
+    };
     kernel = rec {
       config = {
         # Most of this is necessary infra to allow wireless stack/