drivers/media/usb/uvc/uvc_debugfs.c

File Facts

System

Linux kernel

Corpus path

drivers/media/usb/uvc/uvc_debugfs.c

Extension

.c

Size

2482 bytes

Lines

105

Domain

Driver Families

Bucket

drivers/media

Inferred role

Driver Families: operation-table or driver-model contract

Status

pattern implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

• Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
• Defines an operation table; this is where Linux turns generic core objects into subsystem-specific behavior.
• 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/module.h
• linux/debugfs.h
• linux/slab.h
• linux/usb.h
• uvcvideo.h

Detected Declarations

• struct uvc_debugfs_buffer
• function uvc_debugfs_stats_open
• function uvc_debugfs_stats_read
• function uvc_debugfs_stats_release
• function uvc_debugfs_init_stream
• function uvc_debugfs_cleanup_stream
• function uvc_debugfs_init
• function uvc_debugfs_cleanup

Annotated Snippet

static const struct file_operations uvc_debugfs_stats_fops = {
	.owner = THIS_MODULE,
	.open = uvc_debugfs_stats_open,
	.read = uvc_debugfs_stats_read,
	.release = uvc_debugfs_stats_release,
};

/* -----------------------------------------------------------------------------
 * Global and stream initialization/cleanup
 */

static struct dentry *uvc_debugfs_root_dir;

void uvc_debugfs_init_stream(struct uvc_streaming *stream)
{
	struct usb_device *udev = stream->dev->udev;
	char dir_name[33];

	if (uvc_debugfs_root_dir == NULL)
		return;

	snprintf(dir_name, sizeof(dir_name), "%u-%u-%u", udev->bus->busnum,
		 udev->devnum, stream->intfnum);

	stream->debugfs_dir = debugfs_create_dir(dir_name,
						 uvc_debugfs_root_dir);

	debugfs_create_file("stats", 0444, stream->debugfs_dir, stream,
			    &uvc_debugfs_stats_fops);
}

void uvc_debugfs_cleanup_stream(struct uvc_streaming *stream)
{
	debugfs_remove_recursive(stream->debugfs_dir);
	stream->debugfs_dir = NULL;
}

void uvc_debugfs_init(void)
{
	uvc_debugfs_root_dir = debugfs_create_dir("uvcvideo", usb_debug_root);
}

void uvc_debugfs_cleanup(void)
{
	debugfs_remove_recursive(uvc_debugfs_root_dir);
}

Annotation

• Immediate include surface: `linux/module.h`, `linux/debugfs.h`, `linux/slab.h`, `linux/usb.h`, `uvcvideo.h`.
• Detected declarations: `struct uvc_debugfs_buffer`, `function uvc_debugfs_stats_open`, `function uvc_debugfs_stats_read`, `function uvc_debugfs_stats_release`, `function uvc_debugfs_init_stream`, `function uvc_debugfs_cleanup_stream`, `function uvc_debugfs_init`, `function uvc_debugfs_cleanup`.
• Atlas domain: Driver Families / drivers/media.
• Implementation status: pattern implementation candidate.

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.