sound/drivers/serial-u16550.c

File Facts

System

Linux kernel

Corpus path

sound/drivers/serial-u16550.c

Extension

.c

Size

29272 bytes

Lines

976

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.
• Touches IRQ or DMA behavior; this matters for the representative real-device path.
• 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/interrupt.h
• linux/err.h
• linux/platform_device.h
• linux/slab.h
• linux/ioport.h
• linux/module.h
• linux/io.h
• sound/core.h
• sound/rawmidi.h
• sound/initval.h
• linux/serial_reg.h
• linux/jiffies.h

Detected Declarations

• struct snd_uart16550
• function snd_uart16550_add_timer
• function snd_uart16550_del_timer
• function snd_uart16550_buffer_output
• function snd_uart16550_io_loop
• function snd_uart16550_interrupt
• function snd_uart16550_buffer_timer
• function snd_uart16550_detect
• function snd_uart16550_do_open
• function snd_uart16550_do_close
• function snd_uart16550_input_open
• function snd_uart16550_input_close
• function snd_uart16550_input_trigger
• function snd_uart16550_output_open
• function snd_uart16550_output_close
• function snd_uart16550_buffer_can_write
• function snd_uart16550_write_buffer
• function snd_uart16550_output_byte
• function snd_uart16550_output_write
• function snd_uart16550_output_trigger
• function scoped_guard
• function snd_uart16550_create
• function snd_uart16550_substreams
• function list_for_each_entry
• function snd_uart16550_rmidi
• function snd_serial_probe
• function snd_serial_unregister_all
• function alsa_card_serial_init
• function alsa_card_serial_exit
• module init alsa_card_serial_init

Annotated Snippet

module_init(alsa_card_serial_init)
module_exit(alsa_card_serial_exit)

Annotation

• Immediate include surface: `linux/init.h`, `linux/interrupt.h`, `linux/err.h`, `linux/platform_device.h`, `linux/slab.h`, `linux/ioport.h`, `linux/module.h`, `linux/io.h`.
• Detected declarations: `struct snd_uart16550`, `function snd_uart16550_add_timer`, `function snd_uart16550_del_timer`, `function snd_uart16550_buffer_output`, `function snd_uart16550_io_loop`, `function snd_uart16550_interrupt`, `function snd_uart16550_buffer_timer`, `function snd_uart16550_detect`, `function snd_uart16550_do_open`, `function snd_uart16550_do_close`.
• 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.
• 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.