Merge pull request #121 from samueldr/feature/holo-dmi-rules

steamdeck/hw-support: Loosen (optionally) product_serial access

modules/steamdeck/hw-support.nix

@@ -27,6 +27,15 @@ in
         default = cfg.enable;
         type = types.bool;
       };
+      enableProductSerialAccess = mkOption {
+        default = cfg.enable;
+        type = types.bool;
+        description = lib.mdDoc ''
+          > Loosen the product_serial node to `440 / root:wheel`, rather than `400 / root:root`
+          > to allow the physical users to read S/N without auth.
+          — holo-dmi-rules 1.0
+        '';
+      };
     };
   };
 
@@ -35,6 +44,11 @@ in
       # Firmware is required in stage-1 for early KMS.
       hardware.enableRedistributableFirmware = true;
     })
+    (mkIf (cfg.enableProductSerialAccess) {
+      systemd.tmpfiles.rules = [
+        "z /sys/class/dmi/id/product_serial 440 root wheel - -"
+      ];
+    })
     (mkIf (cfg.enableDefaultStage1Modules) {
       boot.initrd.kernelModules = [
         "hid-generic"