drivers/extcon/extcon.c

File Facts

System

Linux kernel

Corpus path

drivers/extcon/extcon.c

Extension

.c

Size

37871 bytes

Lines

1489

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.
• 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/module.h
• linux/types.h
• linux/idr.h
• linux/init.h
• linux/device.h
• linux/fs.h
• linux/err.h
• linux/of.h
• linux/slab.h
• linux/sysfs.h
• extcon.h

Detected Declarations

• struct extcon_cable
• function check_mutually_exclusive
• function find_cable_index_by_id
• function get_extcon_type
• function is_extcon_attached
• function is_extcon_changed
• function is_extcon_property_supported
• function is_extcon_property_capability
• function init_property
• function state_show
• function name_show
• function cable_name_show
• function cable_state_show
• function extcon_sync
• function extcon_get_state
• function extcon_set_state
• function extcon_set_state_sync
• function extcon_get_property
• function extcon_set_property
• function extcon_set_property_sync
• function extcon_get_property_capability
• function extcon_set_property_capability
• function extcon_get_extcon_dev
• function extcon_register_notifier
• function extcon_unregister_notifier
• function extcon_register_notifier_all
• function extcon_unregister_notifier_all
• function create_extcon_class
• function extcon_dev_release
• function dummy_sysfs_dev_release
• function extcon_dev_free
• function extcon_alloc_cables
• function extcon_alloc_muex
• function extcon_alloc_groups
• function extcon_dev_register
• function extcon_dev_unregister
• function ERR_PTR
• function ERR_PTR
• function extcon_get_edev_name
• function extcon_class_init
• function extcon_class_exit
• module init extcon_class_init
• export extcon_sync
• export extcon_get_state
• export extcon_set_state
• export extcon_set_state_sync
• export extcon_get_property
• export extcon_set_property

Annotated Snippet

module_init(extcon_class_init);

static void __exit extcon_class_exit(void)
{
	class_destroy(extcon_class);
}
module_exit(extcon_class_exit);

MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
MODULE_DESCRIPTION("External Connector (extcon) framework");
MODULE_LICENSE("GPL v2");

Annotation

• Immediate include surface: `linux/module.h`, `linux/types.h`, `linux/idr.h`, `linux/init.h`, `linux/device.h`, `linux/fs.h`, `linux/err.h`, `linux/of.h`.
• Detected declarations: `struct extcon_cable`, `function check_mutually_exclusive`, `function find_cable_index_by_id`, `function get_extcon_type`, `function is_extcon_attached`, `function is_extcon_changed`, `function is_extcon_property_supported`, `function is_extcon_property_capability`, `function init_property`, `function state_show`.
• Atlas domain: Driver Families / drivers/extcon.
• 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.