samples/v4l/v4l2-pci-skeleton.c

File Facts

System

Linux kernel

Corpus path

samples/v4l/v4l2-pci-skeleton.c

Extension

.c

Size

25184 bytes

Lines

901

Domain

Support Tooling And Documentation

Bucket

samples

Inferred role

Support Tooling And Documentation: operation-table or driver-model contract

Status

pattern implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

• Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
• Defines an operation table; this is where Linux turns generic core objects into subsystem-specific behavior.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Touches IRQ or DMA behavior; this matters for the representative real-device path.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/types.h
• linux/kernel.h
• linux/module.h
• linux/init.h
• linux/kmod.h
• linux/mutex.h
• linux/pci.h
• linux/interrupt.h
• linux/videodev2.h
• linux/v4l2-dv-timings.h
• media/v4l2-device.h
• media/v4l2-dev.h
• media/v4l2-ioctl.h
• media/v4l2-dv-timings.h
• media/v4l2-ctrls.h
• media/v4l2-event.h
• media/videobuf2-v4l2.h
• media/videobuf2-dma-contig.h

Detected Declarations

• struct skeleton
• struct skel_buffer
• function skeleton_irq
• function queue_setup
• function buffer_prepare
• function buffer_queue
• function return_all_buffers
• function start_streaming
• function stop_streaming
• function skeleton_querycap
• function skeleton_fill_pix_format
• function skeleton_try_fmt_vid_cap
• function skeleton_s_fmt_vid_cap
• function skeleton_g_fmt_vid_cap
• function skeleton_enum_fmt_vid_cap
• function skeleton_s_std
• function skeleton_g_std
• function tvnorms
• function skeleton_s_dv_timings
• function skeleton_g_dv_timings
• function skeleton_enum_dv_timings
• function system
• function skeleton_dv_timings_cap
• function skeleton_enum_input
• function skeleton_s_input
• function skeleton_g_input
• function skeleton_s_ctrl
• function skeleton_probe
• function skeleton_remove

Annotated Snippet

static struct pci_driver skeleton_driver = {
	.name = KBUILD_MODNAME,
	.probe = skeleton_probe,
	.remove = skeleton_remove,
	.id_table = skeleton_pci_tbl,
};

module_pci_driver(skeleton_driver);

Annotation

• Immediate include surface: `linux/types.h`, `linux/kernel.h`, `linux/module.h`, `linux/init.h`, `linux/kmod.h`, `linux/mutex.h`, `linux/pci.h`, `linux/interrupt.h`.
• Detected declarations: `struct skeleton`, `struct skel_buffer`, `function skeleton_irq`, `function queue_setup`, `function buffer_prepare`, `function buffer_queue`, `function return_all_buffers`, `function start_streaming`, `function stop_streaming`, `function skeleton_querycap`.
• Atlas domain: Support Tooling And Documentation / samples.
• Implementation status: pattern implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.
• IRQ or DMA behavior appears here, which is relevant to the selected PCIe/NVMe device path.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.