From 3293cd6542bfbe35be6d281260e8327bdbc5667a Mon Sep 17 00:00:00 2001
From: Markus Fritsche <fritsche.markus@gmail.com>
Date: Mon, 18 May 2026 18:25:21 +0000
Subject: [PATCH] =?UTF-8?q?arch/daedalus-v4l2-dkms:=20new=20package=20?=
 =?UTF-8?q?=E2=80=94=20kernel=20module=20via=20DKMS?=
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PKGBUILD pinning the same daedalus-v4l2 @ f04d700 as the
userspace sibling.  Installs kernel/ source to
/usr/src/daedalus_v4l2-<ver>/ with a generated dkms.conf;
AUTOINSTALL=yes builds the module against the running kernel.

The kernel/ Makefile uses -I$(src)/../include for the shared
protocol header.  In the userspace tree that's daedalus-v4l2/include/;
for DKMS we flatten by copying the header into kernel/include/
and patching the Makefile in package() to point there.

Sibling Debian package: debian/daedalus-v4l2-dkms/

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---
 arch/daedalus-v4l2-dkms/PKGBUILD  | 68 +++++++++++++++++++++++++++++++
 arch/daedalus-v4l2-dkms/dkms.conf | 19 +++++++++
 2 files changed, 87 insertions(+)
 create mode 100644 arch/daedalus-v4l2-dkms/PKGBUILD
 create mode 100644 arch/daedalus-v4l2-dkms/dkms.conf

diff --git a/arch/daedalus-v4l2-dkms/PKGBUILD b/arch/daedalus-v4l2-dkms/PKGBUILD
new file mode 100644
index 000000000..963f6a74d
--- /dev/null
+++ b/arch/daedalus-v4l2-dkms/PKGBUILD
@@ -0,0 +1,68 @@
+# Maintainer: Markus Fritsche <fritsche.markus@gmail.com>
+#
+# daedalus-v4l2-dkms — DKMS package for the daedalus_v4l2 out-of-tree
+# kernel module (V4L2 stateless decoder shim for Pi 5 / CM5).
+#
+# Pair to daedalus-v4l2 (userspace daemon).  When loaded, the module
+# registers /dev/videoNN (V4L2 m2m) + /dev/mediaNN (media controller) +
+# /dev/daedalus-v4l2 (chardev to the userspace daemon).  Userspace
+# clients drive the V4L2 m2m + request API path; the daemon does the
+# actual FFmpeg-backed decode on /dev/daedalus-v4l2.
+#
+# Project: https://git.reauktion.de/reauktion/daedalus-v4l2
+# Sibling userspace package: daedalus-v4l2
+# Sibling consumer: libva-v4l2-request-fourier
+
+pkgname=daedalus-v4l2-dkms
+_module=daedalus_v4l2
+
+# Same pin as arch/daedalus-v4l2 — keep kernel module + daemon
+# bit-versioned together so the chardev wire protocol stays in sync.
+_commit=f04d7000f858fe51d867aba14a529d3aef4fbd54
+
+pkgver=0.1.0.r15.f04d700
+pkgrel=1
+pkgdesc="V4L2 stateless decoder shim kernel module (DKMS) — Pi 5 / CM5"
+arch=('any')
+url="https://git.reauktion.de/reauktion/daedalus-v4l2"
+license=('GPL-2.0-or-later')
+depends=('dkms')
+makedepends=('git')
+
+source=("git+https://git.reauktion.de/reauktion/daedalus-v4l2.git#commit=${_commit}"
+        "dkms.conf")
+sha256sums=('SKIP'
+            'SKIP')
+
+pkgver() {
+    cd "${srcdir}/daedalus-v4l2"
+    printf '0.1.0.r%s.%s' \
+        "$(git rev-list --count HEAD)" \
+        "$(git rev-parse --short=7 HEAD)"
+}
+
+package() {
+    local _src="${pkgdir}/usr/src/${_module}-${pkgver}"
+
+    install -dm755 "${_src}"
+
+    # Install the kernel/ subdir and embed the shared proto header in
+    # the same tree.  The in-tree Makefile uses
+    # `ccflags-y += -I$(src)/../include` (assuming the parent
+    # daedalus-v4l2 layout); for DKMS we flatten by copying the header
+    # into kernel/include/ and patching the Makefile to point there.
+    cp -r "${srcdir}/daedalus-v4l2/kernel/." "${_src}/"
+    install -Dm644 "${srcdir}/daedalus-v4l2/include/daedalus_v4l2_proto.h" \
+        "${_src}/include/daedalus_v4l2_proto.h"
+    sed -i 's|-I\$(src)/\.\./include|-I$(src)/include|' "${_src}/Makefile"
+
+    # dkms.conf at the root of the source tree (DKMS convention).
+    # Substitute #MODULE_VERSION# placeholder with the actual pkgver
+    # so dkms install/uninstall match what's on disk.
+    install -Dm644 "${srcdir}/dkms.conf" "${_src}/dkms.conf"
+    sed -i "s/#MODULE_VERSION#/${pkgver}/" "${_src}/dkms.conf"
+
+    # License
+    install -Dm644 "${srcdir}/daedalus-v4l2/kernel/daedalus_v4l2_main.c" \
+        "${pkgdir}/usr/share/licenses/${pkgname}/SPDX-HEADER"
+}
diff --git a/arch/daedalus-v4l2-dkms/dkms.conf b/arch/daedalus-v4l2-dkms/dkms.conf
new file mode 100644
index 000000000..607c28c33
--- /dev/null
+++ b/arch/daedalus-v4l2-dkms/dkms.conf
@@ -0,0 +1,19 @@
+# DKMS configuration for daedalus_v4l2 — V4L2 stateless decoder shim.
+#
+# Built against /lib/modules/$kernelver/build with the in-tree Makefile.
+# The Makefile uses `obj-m := daedalus_v4l2.o` and links
+# daedalus_v4l2_main.o + daedalus_v4l2_chardev.o into the final .ko.
+
+PACKAGE_NAME="daedalus_v4l2"
+PACKAGE_VERSION="#MODULE_VERSION#"
+
+# Single module produced by the Makefile.
+BUILT_MODULE_NAME[0]="daedalus_v4l2"
+DEST_MODULE_LOCATION[0]="/updates"
+
+# Use the package's own Makefile — it already does
+# `$(MAKE) -C $(KERNELDIR) M=$(PWD) modules`.
+MAKE[0]="make KERNELDIR=/lib/modules/${kernelver}/build all"
+CLEAN="make KERNELDIR=/lib/modules/${kernelver}/build clean"
+
+AUTOINSTALL="yes"