drivers/gpio/gpio-it87.c

File Facts

System

Linux kernel

Corpus path

drivers/gpio/gpio-it87.c

Extension

.c

Size

9178 bytes

Lines

411

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.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/cleanup.h
• linux/init.h
• linux/kernel.h
• linux/module.h
• linux/io.h
• linux/errno.h
• linux/ioport.h
• linux/slab.h
• linux/gpio/driver.h

Detected Declarations

• struct it87_gpio
• function superio_enter
• function superio_exit
• function superio_select
• function superio_inb
• function superio_outb
• function superio_inw
• function superio_set_mask
• function superio_clear_mask
• function it87_gpio_request
• function it87_gpio_get
• function it87_gpio_direction_in
• function it87_gpio_set
• function it87_gpio_direction_out
• function it87_gpio_init
• function it87_gpio_exit
• module init it87_gpio_init

Annotated Snippet

module_init(it87_gpio_init);
module_exit(it87_gpio_exit);

MODULE_AUTHOR("Diego Elio Pettenò <flameeyes@flameeyes.eu>");
MODULE_DESCRIPTION("GPIO interface for IT87xx Super I/O chips");
MODULE_LICENSE("GPL");

Annotation

• Immediate include surface: `linux/cleanup.h`, `linux/init.h`, `linux/kernel.h`, `linux/module.h`, `linux/io.h`, `linux/errno.h`, `linux/ioport.h`, `linux/slab.h`.
• Detected declarations: `struct it87_gpio`, `function superio_enter`, `function superio_exit`, `function superio_select`, `function superio_inb`, `function superio_outb`, `function superio_inw`, `function superio_set_mask`, `function superio_clear_mask`, `function it87_gpio_request`.
• 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.