modules: Add hardware module for RTL8192CU

It's actually a backport of Realtek's own USB WiFi driver that is not
(yet?) in mainline. I'm using this for tyree (the T100HA) because the
internal WiFi card isn't recognized by SDHCI yet.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

1 files changed, 47 insertions, 0 deletions

diff --git a/modules/hardware/rtl8192cu.nix b/modules/hardware/rtl8192cu.nix
new file mode 100644
index 00000000..7ffdc63d
--- /dev/null
+++ b/modules/hardware/rtl8192cu.nix
@@ -0,0 +1,47 @@
+{ config, pkgs, lib, ... }:
+
+let
+  inherit (config.boot.kernelPackages) kernel;
+
+  modBaseDir = "kernel/drivers/net/wireless";
+
+  rtl8192cu = pkgs.stdenv.mkDerivation {
+    name = "rtl8192cu-${kernel.version}";
+
+    src = pkgs.fetchFromGitHub {
+      owner = "pvaret";
+      repo = "rtl8192cu-fixes";
+      rev = "f3edeeef68808f0f6fc06b5e36b559e1d06232ab";
+      sha256 = "0v0rrxfmvi9flrg3xns826a6n1mlgd3vs5z2x59aqvwfj5b4rv7b";
+    };
+
+    postPatch = ''
+      substituteInPlace Makefile --replace /sbin/depmod :
+    '';
+
+    makeFlags = [
+      "BUILD_KERNEL=${kernel.modDirVersion}"
+      "KSRC=${kernel.dev}/lib/modules/${kernel.modDirVersion}/build"
+      "MODDESTDIR=$(out)/lib/modules/${kernel.modDirVersion}/${modBaseDir}/"
+    ];
+
+    preInstall = ''
+      mkdir -p "$out/lib/modules/${kernel.modDirVersion}/${modBaseDir}"
+    '';
+
+    enableParallelBuilding = true;
+  };
+
+in {
+  options.vuizvui.hardware.rtl8192cu = {
+    enable = lib.mkEnableOption "support for RTL8192CU wireless chipset";
+  };
+
+  config = lib.mkIf config.vuizvui.hardware.rtl8192cu.enable {
+    boot.extraModulePackages = [ rtl8192cu ];
+    # Note that the module is called "8192cu" so we don't blacklist the module
+    # we actually want to use. The ones we blacklist here are the modules from
+    # the mainline kernel, which unfortunately do not seem to work very well.
+    boot.blacklistedKernelModules = [ "rtl8192cu" "rtl8192c_common" "rtlwifi" ];
+  };
+}