drivers/dio/dio.c

File Facts

System

Linux kernel

Corpus path

drivers/dio/dio.c

Extension

.c

Size

7990 bytes

Lines

289

Domain

Driver Families

Bucket

drivers/dio

Inferred role

Driver Families: exported/initcall integration point

Status

integration 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.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• 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/string.h
• linux/types.h
• linux/kernel.h
• linux/init.h
• linux/dio.h
• linux/slab.h
• linux/uaccess.h
• linux/io.h

Detected Declarations

• struct dioname
• function dio_dev_release
• function dio_find
• function dio_init
• function dio_scodetophysaddr
• module init dio_init

Annotated Snippet

subsys_initcall(dio_init);

/* Bear in mind that this is called in the very early stages of initialisation
 * in order to get the address of the serial port for the console...
 */
unsigned long dio_scodetophysaddr(int scode)
{
	if (scode >= DIOII_SCBASE)
		return (DIOII_BASE + (scode - 132) * DIOII_DEVSIZE);
	else if (scode > DIO_SCMAX || scode < 0)
		return 0;
	else if (DIO_SCINHOLE(scode))
		return 0;

	return (DIO_BASE + scode * DIO_DEVSIZE);
}

Annotation

• Immediate include surface: `linux/module.h`, `linux/string.h`, `linux/types.h`, `linux/kernel.h`, `linux/init.h`, `linux/dio.h`, `linux/slab.h`, `linux/uaccess.h`.
• Detected declarations: `struct dioname`, `function dio_dev_release`, `function dio_find`, `function dio_init`, `function dio_scodetophysaddr`, `module init dio_init`.
• Atlas domain: Driver Families / drivers/dio.
• Implementation status: integration 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.