sound/usb/pcm.h

File Facts

System

Linux kernel

Corpus path

sound/usb/pcm.h

Extension

.h

Size

1108 bytes

Lines

30

Domain

Driver Families

Bucket

sound/usb

Inferred role

Driver Families: implementation source

Status

source 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 or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• No C-style include directives detected by the generator.

Detected Declarations

• No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

#ifndef __USBAUDIO_PCM_H
#define __USBAUDIO_PCM_H

void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream);
int snd_usb_pcm_suspend(struct snd_usb_stream *as);
int snd_usb_pcm_resume(struct snd_usb_stream *as);

bool snd_usb_pcm_has_fixed_rate(struct snd_usb_substream *as);

int snd_usb_init_pitch(struct snd_usb_audio *chip,
		       const struct audioformat *fmt);
void snd_usb_preallocate_buffer(struct snd_usb_substream *subs);

int snd_usb_audioformat_set_sync_ep(struct snd_usb_audio *chip,
				    struct audioformat *fmt);

const struct audioformat *
snd_usb_find_format(struct list_head *fmt_list_head, snd_pcm_format_t format,
		    unsigned int rate, unsigned int channels, bool strict_match,
		    struct snd_usb_substream *subs);
const struct audioformat *
snd_usb_find_substream_format(struct snd_usb_substream *subs,
			      const struct snd_pcm_hw_params *params);

int snd_usb_hw_params(struct snd_usb_substream *subs,
		      struct snd_pcm_hw_params *hw_params);
int snd_usb_hw_free(struct snd_usb_substream *subs);
#endif /* __USBAUDIO_PCM_H */

Annotation

• Atlas domain: Driver Families / sound/usb.
• Implementation status: source 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.