drivers/char/ttyprintk.c

File Facts

System

Linux kernel

Corpus path

drivers/char/ttyprintk.c

Extension

.c

Size

5326 bytes

Lines

233

Domain

Driver Families

Bucket

drivers/char

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.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/console.h
• linux/device.h
• linux/serial.h
• linux/tty.h
• linux/module.h
• linux/spinlock.h

Detected Declarations

• struct ttyprintk_port
• function tpk_flush
• function tpk_printk
• function tpk_open
• function tpk_close
• function tpk_write
• function tpk_write_room
• function tpk_hangup
• function tpk_port_shutdown
• function ttyprintk_init
• function ttyprintk_exit
• module init ttyprintk_init

Annotated Snippet

device_initcall(ttyprintk_init);
module_exit(ttyprintk_exit);

MODULE_DESCRIPTION("TTY driver to output user messages via printk");
MODULE_LICENSE("GPL");

Annotation

• Immediate include surface: `linux/console.h`, `linux/device.h`, `linux/serial.h`, `linux/tty.h`, `linux/module.h`, `linux/spinlock.h`.
• Detected declarations: `struct ttyprintk_port`, `function tpk_flush`, `function tpk_printk`, `function tpk_open`, `function tpk_close`, `function tpk_write`, `function tpk_write_room`, `function tpk_hangup`, `function tpk_port_shutdown`, `function ttyprintk_init`.
• Atlas domain: Driver Families / drivers/char.
• Implementation status: integration 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.