sound/pci/cs4281.c

File Facts

System

Linux kernel

Corpus path

sound/pci/cs4281.c

Extension

.c

Size

62483 bytes

Lines

1984

Domain

Driver Families

Bucket

sound/pci

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.
• Touches user memory; correctness depends on fault-safe copying and privilege boundary handling.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Touches IRQ or DMA behavior; this matters for the representative real-device path.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/io.h
• linux/delay.h
• linux/interrupt.h
• linux/init.h
• linux/pci.h
• linux/slab.h
• linux/gameport.h
• linux/module.h
• sound/core.h
• sound/control.h
• sound/pcm.h
• sound/rawmidi.h
• sound/ac97_codec.h
• sound/tlv.h
• sound/opl3.h
• sound/initval.h

Detected Declarations

• struct cs4281_dma
• struct cs4281
• function snd_cs4281_pokeBA0
• function snd_cs4281_peekBA0
• function snd_cs4281_ac97_write
• function snd_cs4281_ac97_read
• function snd_cs4281_trigger
• function snd_cs4281_rate
• function snd_cs4281_mode
• function snd_cs4281_playback_prepare
• function snd_cs4281_capture_prepare
• function snd_cs4281_pointer
• function snd_cs4281_playback_open
• function snd_cs4281_capture_open
• function snd_cs4281_playback_close
• function snd_cs4281_capture_close
• function snd_cs4281_pcm
• function snd_cs4281_info_volume
• function snd_cs4281_get_volume
• function snd_cs4281_put_volume
• function snd_cs4281_mixer_free_ac97_bus
• function snd_cs4281_mixer_free_ac97
• function snd_cs4281_mixer
• function snd_cs4281_proc_read
• function snd_cs4281_BA0_read
• function snd_cs4281_BA1_read
• function snd_cs4281_proc_init
• function snd_cs4281_gameport_trigger
• function snd_cs4281_gameport_read
• function snd_cs4281_gameport_cooked_read
• function snd_cs4281_gameport_open
• function snd_cs4281_create_gameport
• function snd_cs4281_free_gameport
• function snd_cs4281_create_gameport
• function snd_cs4281_free_gameport
• function snd_cs4281_create
• function snd_cs4281_chip_init
• function snd_cs4281_midi_reset
• function snd_cs4281_midi_input_open
• function snd_cs4281_midi_input_close
• function snd_cs4281_midi_output_open
• function snd_cs4281_midi_output_close
• function snd_cs4281_midi_input_trigger
• function snd_cs4281_midi_output_trigger
• function snd_cs4281_midi
• function snd_cs4281_interrupt
• function snd_cs4281_opl3_command
• function __snd_cs4281_probe

Annotated Snippet

static struct pci_driver cs4281_driver = {
	.name = KBUILD_MODNAME,
	.id_table = snd_cs4281_ids,
	.probe = snd_cs4281_probe,
	.driver = {
		.pm = &cs4281_pm,
	},
};
	
module_pci_driver(cs4281_driver);

Annotation

• Immediate include surface: `linux/io.h`, `linux/delay.h`, `linux/interrupt.h`, `linux/init.h`, `linux/pci.h`, `linux/slab.h`, `linux/gameport.h`, `linux/module.h`.
• Detected declarations: `struct cs4281_dma`, `struct cs4281`, `function snd_cs4281_pokeBA0`, `function snd_cs4281_peekBA0`, `function snd_cs4281_ac97_write`, `function snd_cs4281_ac97_read`, `function snd_cs4281_trigger`, `function snd_cs4281_rate`, `function snd_cs4281_mode`, `function snd_cs4281_playback_prepare`.
• Atlas domain: Driver Families / sound/pci.
• Implementation status: pattern implementation candidate.
• This snippet crosses the user/kernel memory boundary; validate fault handling and access checks before translating the pattern.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.
• IRQ or DMA behavior appears here, which is relevant to the selected PCIe/NVMe device path.

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.