drivers/gpio/gpio-wm831x.c

File Facts

System

Linux kernel

Corpus path

drivers/gpio/gpio-wm831x.c

Extension

.c

Size

7581 bytes

Lines

308

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.
• 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/cleanup.h
• linux/kernel.h
• linux/slab.h
• linux/module.h
• linux/gpio/driver.h
• linux/mfd/core.h
• linux/platform_device.h
• linux/seq_file.h
• linux/string_choices.h
• linux/mfd/wm831x/core.h
• linux/mfd/wm831x/pdata.h
• linux/mfd/wm831x/gpio.h
• linux/mfd/wm831x/irq.h

Detected Declarations

• struct wm831x_gpio
• function wm831x_gpio_direction_in
• function wm831x_gpio_get
• function wm831x_gpio_set
• function wm831x_gpio_direction_out
• function wm831x_gpio_to_irq
• function wm831x_gpio_set_debounce
• function wm831x_set_config
• function wm831x_gpio_dbg_show
• function wm831x_gpio_probe
• function wm831x_gpio_init
• function wm831x_gpio_exit
• module init wm831x_gpio_init

Annotated Snippet

subsys_initcall(wm831x_gpio_init);

static void __exit wm831x_gpio_exit(void)
{
	platform_driver_unregister(&wm831x_gpio_driver);
}
module_exit(wm831x_gpio_exit);

MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("GPIO interface for WM831x PMICs");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm831x-gpio");

Annotation

• Immediate include surface: `linux/cleanup.h`, `linux/kernel.h`, `linux/slab.h`, `linux/module.h`, `linux/gpio/driver.h`, `linux/mfd/core.h`, `linux/platform_device.h`, `linux/seq_file.h`.
• Detected declarations: `struct wm831x_gpio`, `function wm831x_gpio_direction_in`, `function wm831x_gpio_get`, `function wm831x_gpio_set`, `function wm831x_gpio_direction_out`, `function wm831x_gpio_to_irq`, `function wm831x_gpio_set_debounce`, `function wm831x_set_config`, `function wm831x_gpio_dbg_show`, `function wm831x_gpio_probe`.
• Atlas domain: Driver Families / drivers/gpio.
• Implementation status: integration 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.