drivers/usb/common/common.c

File Facts

System

Linux kernel

Corpus path

drivers/usb/common/common.c

Extension

.c

Size

12783 bytes

Lines

453

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.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/kernel.h
• linux/module.h
• linux/of.h
• linux/platform_device.h
• linux/usb/ch9.h
• linux/usb/of.h
• linux/usb/otg.h
• linux/of_platform.h
• linux/debugfs.h
• common.h

Detected Declarations

• function usb_ep_type_string
• function usb_otg_state_string
• function usb_speed_string
• function usb_get_maximum_speed
• function usb_get_maximum_ssp_rate
• function usb_get_dr_mode_from_string
• function usb_get_dr_mode
• function usb_get_role_switch_default_mode
• function usb_decode_interval
• function of_usb_get_dr_mode_by_phy
• function for_each_node_with_property
• function hosts
• function of_usb_update_otg_caps
• function usb_common_init
• function usb_common_exit
• module init usb_common_init
• export usb_ep_type_string
• export usb_otg_state_string
• export usb_speed_string
• export usb_get_maximum_speed
• export usb_get_maximum_ssp_rate
• export usb_state_string
• export usb_get_dr_mode
• export usb_get_role_switch_default_mode
• export usb_decode_interval
• export of_usb_get_dr_mode_by_phy
• export of_usb_host_tpl_support
• export of_usb_update_otg_caps
• export usb_of_get_companion_dev
• export usb_debug_root
• export usb_dynids_lock

Annotated Snippet

subsys_initcall(usb_common_init);
module_exit(usb_common_exit);

MODULE_DESCRIPTION("Common code for host and device side USB");
MODULE_LICENSE("GPL");

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/module.h`, `linux/of.h`, `linux/platform_device.h`, `linux/usb/ch9.h`, `linux/usb/of.h`, `linux/usb/otg.h`, `linux/of_platform.h`.
• Detected declarations: `function usb_ep_type_string`, `function usb_otg_state_string`, `function usb_speed_string`, `function usb_get_maximum_speed`, `function usb_get_maximum_ssp_rate`, `function usb_get_dr_mode_from_string`, `function usb_get_dr_mode`, `function usb_get_role_switch_default_mode`, `function usb_decode_interval`, `function of_usb_get_dr_mode_by_phy`.
• Atlas domain: Driver Families / drivers/usb.
• 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.