drivers/input/joystick/db9.c

File Facts

System

Linux kernel

Corpus path

drivers/input/joystick/db9.c

Extension

.c

Size

20551 bytes

Lines

706

Domain

Driver Families

Bucket

drivers/input

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/kernel.h
• linux/module.h
• linux/delay.h
• linux/init.h
• linux/parport.h
• linux/input.h
• linux/mutex.h
• linux/slab.h

Detected Declarations

• struct db9_config
• struct db9_mode_data
• struct db9
• function db9_saturn_write_sub
• function gc_saturn_read_sub
• function db9_saturn_read_analog
• function db9_saturn_read_packet
• function db9_saturn_report
• function db9_saturn
• function db9_timer
• function db9_open
• function scoped_guard
• function db9_close
• function db9_attach
• function db9_detach
• function db9_init
• function db9_exit
• module init db9_init

Annotated Snippet

module_init(db9_init);
module_exit(db9_exit);

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/module.h`, `linux/delay.h`, `linux/init.h`, `linux/parport.h`, `linux/input.h`, `linux/mutex.h`, `linux/slab.h`.
• Detected declarations: `struct db9_config`, `struct db9_mode_data`, `struct db9`, `function db9_saturn_write_sub`, `function gc_saturn_read_sub`, `function db9_saturn_read_analog`, `function db9_saturn_read_packet`, `function db9_saturn_report`, `function db9_saturn`, `function db9_timer`.
• Atlas domain: Driver Families / drivers/input.
• 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.