microsoft/surface: remove repos.nix file and update README

microsoft/surface/common/default.nix

@@ -1,19 +1,19 @@
 { config, lib, pkgs, ... }:
 
 let
-  inherit (lib) mkDefault mkOption types;
+  inherit (lib) fetchFromGitHub mkDefault mkOption types versions;
 
-  shortVersion = config.microsoft-surface.kernelVersion;
-  version = if shortVersion == "6.12" then
+  # Set the full kernel version and hashes
+  version =
+    if config.microsoft-surface.kernelVersion == "lts" then
       "6.12.19"
-    else if shortVersion == "6.13" then
+    else if config.microsoft-surface.kernelVersion == "latest" then
       "6.13.6"
     else
-      abort "Invalid kernel version: ${shortVersion}";
-
-  rev = "arch-${version}-1";
+      abort "Invalid kernel version: ${config.microsoft-surface.kernelVersion}";
   
-  hash =
+  shortVersion = versions.majorMinor version;
+  packageHash =
     if shortVersion == "6.12" then
       "sha256-Pv7O8D8ma+MPLhYP3HSGQki+Yczp8b7d63qMb6l4+mY="
     else if shortVersion == "6.13" then
@@ -29,15 +29,26 @@ let
     else
       abort "Invalid kernel version: ${shortVersion}";
 
-  inherit (pkgs.callPackage ./kernel/linux-package.nix { repos = pkgs.callPackage ./kernel/repos.nix { rev = rev; hash = hash; }; }) linuxPackage surfacePatches;
+  # Fetch the release from the linux-surface project
+  rev = "arch-${version}-1";
+  repos = pkgs.callPackage ({ fetchFromGitHub, rev, packageHash }: {
+    linux-surface = fetchFromGitHub {
+      owner = "linux-surface";
+      repo = "linux-surface";
+      rev = rev;
+      hash = packageHash;
+    };
+  }) { inherit rev packageHash; };
 
+  # Build the kernel package
+  inherit (pkgs.callPackage ./kernel/linux-package.nix { inherit repos; }) linuxPackage surfacePatches;
   kernelPatches = surfacePatches {
     inherit version;
     patchFn = ./kernel/${shortVersion}/patches.nix;
   };
   kernelPackages = linuxPackage {
     inherit version kernelPatches;
-    sha256 = srcHash;
+    hash = srcHash;
     ignoreConfigErrors=true;
   };
 
@@ -45,24 +56,24 @@ in {
   options.microsoft-surface.kernelVersion = mkOption {
     description = "Kernel Version to use (patched for MS Surface)";
     type = types.enum [
-      "6.12"
-      "6.13"
+      "lts"
+      "latest"
     ];
-    default = "6.12";
+    default = "lts";
   };
 
   config = {
     boot = {
       inherit kernelPackages;
 
-      kernelParams = mkDefault [ "mem_sleep_default=deep" ];
       # Seems to be required to properly enable S0ix "Modern Standby":
+      kernelParams = mkDefault [ "mem_sleep_default=deep" ];
     };
 
     # NOTE: Check the README before enabling TLP:
     services.tlp.enable = mkDefault false;
 
-    # i.e. needed for wifi firmware, see https://github.com/NixOS/nixos-hardware/issues/364
+    # Needed for wifi firmware, see https://github.com/NixOS/nixos-hardware/issues/364
     hardware = {
       enableRedistributableFirmware = mkDefault true;
       sensor.iio.enable = mkDefault true;

microsoft/surface/common/kernel/repos.nix

@@ -1,9 +0,0 @@
-{ fetchFromGitHub, rev, hash }:
-{
-  linux-surface = fetchFromGitHub {
-    owner = "linux-surface";
-    repo = "linux-surface";
-    rev = rev;
-    hash = hash;
-  };
-}