drivers/accessibility/speakup/serialio.h

File Facts

System

Linux kernel

Corpus path

drivers/accessibility/speakup/serialio.h

Extension

.h

Size

1093 bytes

Lines

41

Domain

Driver Families

Bucket

drivers/accessibility

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

• linux/serial.h
• linux/serial_reg.h
• linux/serial_core.h
• spk_priv.h

Detected Declarations

• struct old_serial_port

Annotated Snippet

struct old_serial_port {
	unsigned int uart; /* unused */
	unsigned int baud_base;
	unsigned int port;
	unsigned int irq;
	upf_t flags; /* unused */
};

/* countdown values for serial timeouts in us */
#define SPK_SERIAL_TIMEOUT SPK_SYNTH_TIMEOUT
/* countdown values transmitter/dsr timeouts in us */
#define SPK_XMITR_TIMEOUT 100000
/* countdown values cts timeouts in us */
#define SPK_CTS_TIMEOUT 100000
/* check ttyS0 ... ttyS3 */
#define SPK_LO_TTY 0
#define SPK_HI_TTY 3
/* # of timeouts permitted before disable */
#define NUM_DISABLE_TIMEOUTS 3
/* buffer timeout in ms */
#define SPK_TIMEOUT 100

#define spk_serial_tx_busy() \
	(!uart_lsr_tx_empty(inb(speakup_info.port_tts + UART_LSR)))

#endif

Annotation

• Immediate include surface: `linux/serial.h`, `linux/serial_reg.h`, `linux/serial_core.h`, `spk_priv.h`.
• Detected declarations: `struct old_serial_port`.
• Atlas domain: Driver Families / drivers/accessibility.
• 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.