marfrit
9415b7e0f7
Out-of-tree Linux kernel module registering /dev/videoNN. Phase 8.1 scope: skeleton only — VIDIOC_QUERYCAP works, no codec ioctls / no vb2_queue / no controls yet. Real V4L2 plumbing throughout per "correctness before speed": platform_device + v4l2_device + video_device, properly nested with error paths and devm_kzalloc-managed lifetime. Per-cycle 9 discipline ports to kernel code: SPDX header, kernel coding style (8-tab, static-by-default), kerneldoc on structs, no shortcuts. Files (~250 LOC total): - kernel/Makefile — out-of-tree kbuild with checkpatch target - kernel/daedalus_v4l2_main.c — module init/exit + probe/remove Verification on hertz (Pi 5, 6.12.75+rpt-rpi-2712): - Builds clean with -Wall -Wextra. No warnings. - modprobe / rmmod round-trip clean. No dmesg taints beyond the expected "out-of-tree taint" line. - v4l2-ctl --list-devices shows: "daedalus-fourier V3D7+NEON (platform:daedalus_v4l2): /dev/video0" - VIDIOC_QUERYCAP returns driver/card/bus/caps as specified. - v4l2-compliance: 44/48 passing. The 4 failures are exactly the format/buffer ioctls Phase 8.2 will implement (ENUM_FMT, G_FMT, Scaling, REQBUFS) — not skeleton bugs, legitimately-absent features. Documentation: docs/phase_8_1_closure.md captures full verification output + Phase 8.2 plan. Phase 8.1 acceptance criteria met: - ✓ /dev/videoNN appears via v4l2-ctl --list-devices - ✓ VIDIOC_QUERYCAP responds with sensible values - ✓ rmmod is clean (no kref leaks) - ✓ v4l2-compliance passes except for explicit Phase 8.2 work Next: Phase 8.2 chardev bridge for kernel ↔ daemon IPC. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
47 lines
1.2 KiB
Makefile
47 lines
1.2 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0-or-later
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#
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# daedalus-v4l2 — out-of-tree kbuild for the Linux kernel V4L2
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# stateless decoder shim. Forwards bitstream + controls to the
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# daedalus-v4l2 userspace daemon via a chardev bridge.
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#
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# Build against the running kernel:
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# make
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# Or against a specific kernel:
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# make KERNELDIR=/path/to/kernel/source
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# Install (requires root):
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# sudo make install
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# Clean:
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# make clean
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obj-m := daedalus_v4l2.o
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daedalus_v4l2-objs := daedalus_v4l2_main.o
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KERNELDIR ?= /lib/modules/$(shell uname -r)/build
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PWD := $(shell pwd)
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# Be strict: warnings are errors, kernel coding style enforced.
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ccflags-y := -Wall -Wextra -Wno-unused-parameter
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all:
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$(MAKE) -C $(KERNELDIR) M=$(PWD) modules
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install: all
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$(MAKE) -C $(KERNELDIR) M=$(PWD) modules_install
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depmod -a
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clean:
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$(MAKE) -C $(KERNELDIR) M=$(PWD) clean
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# Run kernel checkpatch.pl against the source. Picks up the
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# kernel-tree-installed checkpatch via the running kernel's
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# build directory if present.
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checkpatch:
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@if [ -x $(KERNELDIR)/scripts/checkpatch.pl ]; then \
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$(KERNELDIR)/scripts/checkpatch.pl --no-tree --strict -f *.c; \
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else \
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echo "checkpatch.pl not available at $(KERNELDIR)/scripts/"; \
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exit 1; \
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fi
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.PHONY: all install clean checkpatch
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