drivers/gpio/gpio-max7301.c

File Facts

System

Linux kernel

Corpus path

drivers/gpio/gpio-max7301.c

Extension

.c

Size

2392 bytes

Lines

105

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/module.h
• linux/init.h
• linux/platform_device.h
• linux/mutex.h
• linux/slab.h
• linux/spi/spi.h
• linux/spi/max7301.h

Detected Declarations

• function Copyright
• function max7301_spi_read
• function max7301_probe
• function max7301_remove
• function max7301_init
• function max7301_exit
• module init max7301_init

Annotated Snippet

subsys_initcall(max7301_init);

static void __exit max7301_exit(void)
{
	spi_unregister_driver(&max7301_driver);
}
module_exit(max7301_exit);

MODULE_AUTHOR("Juergen Beisert, Wolfram Sang");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("MAX7301 GPIO-Expander");

Annotation

• Immediate include surface: `linux/module.h`, `linux/init.h`, `linux/platform_device.h`, `linux/mutex.h`, `linux/slab.h`, `linux/spi/spi.h`, `linux/spi/max7301.h`.
• Detected declarations: `function Copyright`, `function max7301_spi_read`, `function max7301_probe`, `function max7301_remove`, `function max7301_init`, `function max7301_exit`, `module init max7301_init`.
• 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.