drivers/extcon/extcon-fsa9480.c

File Facts

System

Linux kernel

Corpus path

drivers/extcon/extcon-fsa9480.c

Extension

.c

Size

10277 bytes

Lines

391

Domain

Driver Families

Bucket

drivers/extcon

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.
• Touches IRQ or DMA behavior; this matters for the representative real-device path.
• 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/module.h
• linux/types.h
• linux/i2c.h
• linux/slab.h
• linux/bitops.h
• linux/interrupt.h
• linux/err.h
• linux/platform_device.h
• linux/kobject.h
• linux/extcon-provider.h
• linux/irqdomain.h
• linux/regmap.h

Detected Declarations

• struct fsa9480_usbsw
• function fsa9480_volatile_reg
• function fsa9480_write_reg
• function fsa9480_read_reg
• function fsa9480_read_irq
• function fsa9480_handle_change
• function fsa9480_detect_dev
• function fsa9480_irq_handler
• function fsa9480_probe
• function fsa9480_suspend
• function fsa9480_resume
• function fsa9480_module_init
• function fsa9480_module_exit
• module init fsa9480_module_init

Annotated Snippet

subsys_initcall(fsa9480_module_init);

static void __exit fsa9480_module_exit(void)
{
	i2c_del_driver(&fsa9480_i2c_driver);
}
module_exit(fsa9480_module_exit);

MODULE_DESCRIPTION("Fairchild Semiconductor FSA9480 extcon driver");
MODULE_AUTHOR("Tomasz Figa <tomasz.figa@gmail.com>");
MODULE_LICENSE("GPL");

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/module.h`, `linux/types.h`, `linux/i2c.h`, `linux/slab.h`, `linux/bitops.h`, `linux/interrupt.h`, `linux/err.h`.
• Detected declarations: `struct fsa9480_usbsw`, `function fsa9480_volatile_reg`, `function fsa9480_write_reg`, `function fsa9480_read_reg`, `function fsa9480_read_irq`, `function fsa9480_handle_change`, `function fsa9480_detect_dev`, `function fsa9480_irq_handler`, `function fsa9480_probe`, `function fsa9480_suspend`.
• Atlas domain: Driver Families / drivers/extcon.
• Implementation status: integration implementation candidate.
• IRQ or DMA behavior appears here, which is relevant to the selected PCIe/NVMe device path.

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.