sound/oss/dmasound/dmasound_q40.c

File Facts

System

Linux kernel

Corpus path

sound/oss/dmasound/dmasound_q40.c

Extension

.c

Size

14397 bytes

Lines

640

Domain

Driver Families

Bucket

sound/oss

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.
• 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.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.

Dependency Surface

• linux/module.h
• linux/init.h
• linux/slab.h
• linux/soundcard.h
• linux/interrupt.h
• linux/uaccess.h
• asm/q40ints.h
• asm/q40_master.h
• dmasound.h

Detected Declarations

• function q40_ct_law
• function q40_ct_s8
• function q40_ct_u8
• function q40_ctx_law
• function q40_ctx_s8
• function q40_ctx_u8
• function q40_ctc_law
• function q40_ctc_s8
• function q40_ctc_u8
• function Q40Free
• function Q40IrqInit
• function Q40IrqCleanUp
• function Q40Silence
• function Q40PlayNextFrame
• function Q40Play
• function Q40StereoInterrupt
• function Q40MonoInterrupt
• function Q40Interrupt
• function Q40Init
• function Q40SetFormat
• function Q40SetVolume
• function dmasound_q40_init
• function dmasound_q40_cleanup
• module init dmasound_q40_init

Annotated Snippet

module_init(dmasound_q40_init);
module_exit(dmasound_q40_cleanup);

MODULE_DESCRIPTION("Q40/Q60 sound driver");
MODULE_LICENSE("GPL");

Annotation

• Immediate include surface: `linux/module.h`, `linux/init.h`, `linux/slab.h`, `linux/soundcard.h`, `linux/interrupt.h`, `linux/uaccess.h`, `asm/q40ints.h`, `asm/q40_master.h`.
• Detected declarations: `function q40_ct_law`, `function q40_ct_s8`, `function q40_ct_u8`, `function q40_ctx_law`, `function q40_ctx_s8`, `function q40_ctx_u8`, `function q40_ctc_law`, `function q40_ctc_s8`, `function q40_ctc_u8`, `function Q40Free`.
• Atlas domain: Driver Families / sound/oss.
• Implementation status: integration 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.