marfrit
f0cd29a340
DKMS build failure on higgs (Pi CM5, kernel 6.18.29+rpt-rpi-2712): daedalus_v4l2_main.c:1049: error: too few arguments to function 'v4l2_fh_add' v4l2-fh.h:97: void v4l2_fh_add(struct v4l2_fh *fh, struct file *filp); daedalus_v4l2_main.c:1063: error: too few arguments to function 'v4l2_fh_del' Signature changed exactly at v6.18 (verified v6.13–v6.17 still use the one-arg form via raw.githubusercontent.com tag walk). Wrap the calls with LINUX_VERSION_CODE >= KERNEL_VERSION(6, 18, 0) so the module keeps building against: * 6.12 LTS / RPi 6.12.75 (one-arg) — hertz * 6.12.88+deb13-arm64 (one-arg) * 6.18.29+rpt-rpi-2712 (file* arg) — higgs running kernel Build verified on both: hertz 6.12.75 clean, higgs 6.18.29 clean + modprobe daedalus_v4l2 succeeds, /dev/daedalus-v4l2 + /dev/video0 appear. Add #include <linux/version.h> for KERNEL_VERSION + LINUX_VERSION_CODE (also pulled transitively via module.h but explicit is better than implicit). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
kernel/ — daedalus-v4l2 Linux kernel module
Out-of-tree kernel module providing a V4L2 stateless decoder device that forwards work to a userspace daemon.
Status
Scaffold only. Phase 8.1 not yet started.
Build (when implemented)
make -C /lib/modules/$(uname -r)/build M=$(pwd)
sudo insmod daedalus_v4l2.ko
v4l2-ctl --list-devices # confirm /dev/videoNN appears
Layout (planned)
Makefile— kbuild stubdaedalus_v4l2_main.c— module init + V4L2 device registrationdaedalus_v4l2_chardev.c—/dev/daedalus-v4l2chardev for daemon communicationdaedalus_v4l2_v4l2.c— V4L2 ioctl dispatch (stateless controls)
License
GPLv2. Required for kernel module symbol compatibility.
Phase 8.1 starting point
Minimal example: register a /dev/videoNN that returns -ENOSYS on every ioctl. Validates that the kernel build works and v4l2-ctl can see the device.