sound/drivers/portman2x4.c

File Facts

System

Linux kernel

Corpus path

sound/drivers/portman2x4.c

Extension

.c

Size

24540 bytes

Lines

842

Domain

Driver Families

Bucket

sound/drivers

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.
• 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/init.h
• linux/platform_device.h
• linux/parport.h
• linux/spinlock.h
• linux/delay.h
• linux/slab.h
• linux/module.h
• sound/core.h
• sound/initval.h
• sound/rawmidi.h
• sound/control.h

Detected Declarations

• struct portman
• function portman_free
• function portman_create
• function selected
• function portman_read_status
• function portman_write_data
• function portman_write_midi
• function port
• function portman_data_avail
• function portman_flush_input
• function portman_probe
• function portman_device_init
• function snd_portman_midi_open
• function snd_portman_midi_close
• function snd_portman_midi_input_trigger
• function snd_portman_midi_output_trigger
• function snd_portman_rawmidi_create
• function snd_portman_interrupt
• function snd_portman_attach
• function snd_portman_detach
• function snd_portman_card_private_free
• function snd_portman_probe
• function snd_portman_remove
• function snd_portman_unregister_all
• function snd_portman_module_init
• function snd_portman_module_exit
• module init snd_portman_module_init

Annotated Snippet

module_init(snd_portman_module_init);
module_exit(snd_portman_module_exit);

Annotation

• Immediate include surface: `linux/init.h`, `linux/platform_device.h`, `linux/parport.h`, `linux/spinlock.h`, `linux/delay.h`, `linux/slab.h`, `linux/module.h`, `sound/core.h`.
• Detected declarations: `struct portman`, `function portman_free`, `function portman_create`, `function selected`, `function portman_read_status`, `function portman_write_data`, `function portman_write_midi`, `function port`, `function portman_data_avail`, `function portman_flush_input`.
• Atlas domain: Driver Families / sound/drivers.
• 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.