Initial commit: rtw89-steam-frame DKMS wrapper

DKMS package that fetches the in-tree rtw89 source for the target kernel,
applies the steam-frame patches, and builds/installs the patched RTL8852CU
modules for the Valve Steam Frame wireless adapter.

- dkms.conf: module list + install locations
- build.sh: fetch (gregkh/linux) + patch + build + verify
- register.sh: clone upstream patches, stage into /usr/src, dkms add/build/install

GPL-2.0-only.

register.sh

@@ -0,0 +1,58 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# rtw89-steam-frame - standalone DKMS package register/installer.
+#
+# Pulls the steam-frame patches from upstream (Davenport-Physics/rtw89-steam-frame)
+# via git, stages the package into /usr/src, and runs dkms add/build/install so the
+# patched rtw89 modules are kept working and auto-rebuilt on every kernel upgrade.
+#
+# Run as root (one password prompt):   run0 bash register.sh
+# Overrides (env):
+#   RTW89_UPSTREAM=<git-url>  (default: https://github.com/Davenport-Physics/rtw89-steam-frame)
+#   RTW89_UPSTREAM_REF=<ref>  (default: master)
+#   RTW89_KVER=<kernel-ver>   (default: $(uname -r))
+set -euo pipefail
+
+PACKAGE_NAME="rtw89-steam-frame"
+VERSION="0.1"
+UPSTREAM="${RTW89_UPSTREAM:-https://github.com/Davenport-Physics/rtw89-steam-frame}"
+UPSTREAM_REF="${RTW89_UPSTREAM_REF:-master}"
+KVER="${RTW89_KVER:-$(uname -r)}"
+HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+DST="/usr/src/$PACKAGE_NAME-$VERSION"
+
+for c in git dkms curl patch make gcc modinfo depmod; do
+  command -v "$c" >/dev/null || { echo "error: '$c' not found"; exit 1; }
+done
+[ -d "/lib/modules/$KVER/build" ] || { echo "error: headers for $KVER not installed (install linux-headers)"; exit 1; }
+
+[ "$(id -u)" -eq 0 ] || { echo "error: run as root ('sudo ./register.sh')"; exit 1; }
+
+TMP="$(mktemp -d)"
+trap 'rm -rf "$TMP"' EXIT
+
+echo "== [1/5] pull patches from $UPSTREAM (@$UPSTREAM_REF)"
+git clone --quiet --depth 1 --branch "$UPSTREAM_REF" --single-branch "$UPSTREAM" "$TMP/upstream"
+ls "$TMP/upstream/patches/"*.patch >/dev/null 2>&1 || { echo "error: upstream has no patches/"; exit 1; }
+
+echo "== [2/5] stage package -> $DST  (kernel: $KVER)"
+mkdir -p "$DST/patches"
+cp "$HERE/dkms.conf" "$HERE/build.sh" "$DST/"
+cp "$TMP/upstream/patches/"*.patch "$DST/patches/"
+chmod +x "$DST/build.sh"
+
+echo "== [3/5] dkms add (dropping any previous registration first)"
+dkms status | grep -q "^$PACKAGE_NAME/$VERSION" && dkms remove "$PACKAGE_NAME/$VERSION" --all || true
+dkms add "$DST"
+
+echo "== [4/5] dkms build + install -k $KVER"
+dkms build "$PACKAGE_NAME/$VERSION" -k "$KVER"
+dkms install "$PACKAGE_NAME/$VERSION" -k "$KVER"
+
+echo "== [5/5] verify"
+dkms status "$PACKAGE_NAME/$VERSION"
+echo "  modinfo -n rtw89_core -> $(modinfo -n rtw89_core)"
+echo "  installed: $(ls /lib/modules/$KVER/updates/dkms/rtw89_*.ko.zst 2>/dev/null | tr '\n' ' ')"
+echo
+echo "REGISTER DONE - patches @$UPSTREAM_REF ($(git -C "$TMP/upstream" rev-parse --short HEAD))"