drivers/usb/roles/class.c

File Facts

System

Linux kernel

Corpus path

drivers/usb/roles/class.c

Extension

.c

Size

11324 bytes

Lines

470

Domain

Driver Families

Bucket

drivers/usb

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/component.h
• linux/usb/role.h
• linux/property.h
• linux/device.h
• linux/lockdep.h
• linux/module.h
• linux/mutex.h
• linux/slab.h

Detected Declarations

• struct usb_role_switch
• function connector_bind
• function connector_unbind
• function usb_role_switch_set_role
• function usb_role_switch_get_role
• function usb_role_switch_is_parent
• function usb_role_switch_get
• function usb_role_switch_put
• function usb_role_switch_find_by_fwnode
• function usb_role_switch_is_visible
• function role_show
• function role_store
• function usb_role_switch_uevent
• function usb_role_switch_release
• function usb_role_switch_register
• function usb_role_switch_register
• function usb_role_switch_set_drvdata
• function usb_roles_init
• function usb_roles_exit
• module init usb_roles_init
• export usb_role_switch_set_role
• export usb_role_switch_get_role
• export usb_role_switch_get
• export fwnode_usb_role_switch_get
• export usb_role_switch_put
• export usb_role_switch_find_by_fwnode
• export usb_role_string
• export usb_role_switch_register
• export usb_role_switch_unregister
• export usb_role_switch_set_drvdata
• export usb_role_switch_get_drvdata

Annotated Snippet

subsys_initcall(usb_roles_init);

static void __exit usb_roles_exit(void)
{
	class_unregister(&role_class);
}
module_exit(usb_roles_exit);

MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("USB Role Class");

Annotation

• Immediate include surface: `linux/component.h`, `linux/usb/role.h`, `linux/property.h`, `linux/device.h`, `linux/lockdep.h`, `linux/module.h`, `linux/mutex.h`, `linux/slab.h`.
• Detected declarations: `struct usb_role_switch`, `function connector_bind`, `function connector_unbind`, `function usb_role_switch_set_role`, `function usb_role_switch_get_role`, `function usb_role_switch_is_parent`, `function usb_role_switch_get`, `function usb_role_switch_put`, `function usb_role_switch_find_by_fwnode`, `function usb_role_switch_is_visible`.
• Atlas domain: Driver Families / drivers/usb.
• 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.