drivers/gpio/gpio-htc-egpio.c

File Facts

System

Linux kernel

Corpus path

drivers/gpio/gpio-htc-egpio.c

Extension

.c

Size

10024 bytes

Lines

400

Domain

Driver Families

Bucket

drivers/gpio

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/kernel.h
• linux/errno.h
• linux/interrupt.h
• linux/irq.h
• linux/io.h
• linux/spinlock.h
• linux/platform_data/gpio-htc-egpio.h
• linux/platform_device.h
• linux/slab.h
• linux/init.h
• linux/gpio/driver.h

Detected Declarations

• struct egpio_chip
• struct egpio_info
• function egpio_writew
• function egpio_readw
• function ack_irqs
• function egpio_ack
• function egpio_unmask
• function egpio_handler
• function egpio_pos
• function egpio_bit
• function egpio_get
• function egpio_direction_input
• function egpio_set
• function egpio_direction_output
• function egpio_get_direction
• function egpio_write_cache
• function egpio_probe
• function egpio_suspend
• function egpio_resume
• function egpio_init
• module init egpio_init

Annotated Snippet

subsys_initcall(egpio_init);

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/errno.h`, `linux/interrupt.h`, `linux/irq.h`, `linux/io.h`, `linux/spinlock.h`, `linux/platform_data/gpio-htc-egpio.h`, `linux/platform_device.h`.
• Detected declarations: `struct egpio_chip`, `struct egpio_info`, `function egpio_writew`, `function egpio_readw`, `function ack_irqs`, `function egpio_ack`, `function egpio_unmask`, `function egpio_handler`, `function egpio_pos`, `function egpio_bit`.
• Atlas domain: Driver Families / drivers/gpio.
• 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.