sound/drivers/dummy.c

File Facts

System

Linux kernel

Corpus path

sound/drivers/dummy.c

Extension

.c

Size

31857 bytes

Lines

1177

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/err.h
• linux/platform_device.h
• linux/jiffies.h
• linux/slab.h
• linux/string.h
• linux/time.h
• linux/wait.h
• linux/hrtimer.h
• linux/math64.h
• linux/module.h
• sound/core.h
• sound/control.h
• sound/tlv.h
• sound/pcm.h
• sound/rawmidi.h
• sound/info.h
• sound/initval.h

Detected Declarations

• struct dummy_timer_ops
• struct dummy_model
• struct snd_dummy
• struct dummy_systimer_pcm
• struct dummy_hrtimer_pcm
• struct dummy_hw_field
• function emu10k1_playback_constraints
• function dummy_systimer_rearm
• function dummy_systimer_update
• function dummy_systimer_start
• function dummy_systimer_stop
• function dummy_systimer_prepare
• function dummy_systimer_callback
• function scoped_guard
• function dummy_systimer_pointer
• function dummy_systimer_create
• function dummy_systimer_free
• function dummy_hrtimer_callback
• function dummy_hrtimer_start
• function dummy_hrtimer_stop
• function dummy_hrtimer_sync
• function dummy_hrtimer_pointer
• function dummy_hrtimer_prepare
• function dummy_hrtimer_create
• function dummy_hrtimer_free
• function dummy_pcm_trigger
• function dummy_pcm_prepare
• function dummy_pcm_pointer
• function dummy_pcm_hw_params
• function dummy_pcm_open
• function dummy_pcm_close
• function free_fake_buffer
• function alloc_fake_buffer
• function dummy_pcm_copy
• function dummy_pcm_silence
• function snd_card_dummy_pcm
• function snd_dummy_volume_info
• function snd_dummy_volume_get
• function snd_dummy_volume_put
• function snd_dummy_capsrc_get
• function snd_dummy_capsrc_put
• function snd_dummy_iobox_info
• function snd_dummy_iobox_get
• function snd_dummy_iobox_put
• function snd_card_dummy_new_mixer
• function print_formats
• function pcm_for_each_format
• function print_rates

Annotated Snippet

module_init(alsa_card_dummy_init)
module_exit(alsa_card_dummy_exit)

Annotation

• Immediate include surface: `linux/init.h`, `linux/err.h`, `linux/platform_device.h`, `linux/jiffies.h`, `linux/slab.h`, `linux/string.h`, `linux/time.h`, `linux/wait.h`.
• Detected declarations: `struct dummy_timer_ops`, `struct dummy_model`, `struct snd_dummy`, `struct dummy_systimer_pcm`, `struct dummy_hrtimer_pcm`, `struct dummy_hw_field`, `function emu10k1_playback_constraints`, `function dummy_systimer_rearm`, `function dummy_systimer_update`, `function dummy_systimer_start`.
• 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.