drivers/usb/host/uhci-debug.c

File Facts

System

Linux kernel

Corpus path

drivers/usb/host/uhci-debug.c

Extension

.c

Size

15995 bytes

Lines

638

Domain

Driver Families

Bucket

drivers/usb

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.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• 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/slab.h
• linux/kernel.h
• linux/debugfs.h
• asm/io.h
• uhci-hcd.h

Detected Declarations

• struct uhci_debug
• function lprintk
• function uhci_show_td
• function uhci_show_urbp
• function uhci_show_qh
• function list_for_each_entry
• function uhci_show_sc
• function uhci_show_root_hub_state
• function uhci_show_status
• function uhci_sprint_schedule
• function uhci_debug_open
• function uhci_debug_lseek
• function uhci_debug_read
• function uhci_debug_release
• function lprintk
• function uhci_sprint_schedule

Annotated Snippet

static const struct file_operations uhci_debug_operations = {
	.owner =	THIS_MODULE,
	.open =		uhci_debug_open,
	.llseek =	uhci_debug_lseek,
	.read =		uhci_debug_read,
	.release =	uhci_debug_release,
};
#define UHCI_DEBUG_OPS

#endif	/* CONFIG_DEBUG_FS */

#else	/* CONFIG_DYNAMIC_DEBUG*/

static inline void lprintk(char *buf)
{}

static inline int uhci_show_qh(struct uhci_hcd *uhci,
		struct uhci_qh *qh, char *buf, int len, int space)
{
	return 0;
}

static inline int uhci_sprint_schedule(struct uhci_hcd *uhci,
		char *buf, int len)
{
	return 0;
}

#endif

Annotation

• Immediate include surface: `linux/slab.h`, `linux/kernel.h`, `linux/debugfs.h`, `asm/io.h`, `uhci-hcd.h`.
• Detected declarations: `struct uhci_debug`, `function lprintk`, `function uhci_show_td`, `function uhci_show_urbp`, `function uhci_show_qh`, `function list_for_each_entry`, `function uhci_show_sc`, `function uhci_show_root_hub_state`, `function uhci_show_status`, `function uhci_sprint_schedule`.
• Atlas domain: Driver Families / drivers/usb.
• Implementation status: pattern implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

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.