drivers/usb/core/Kconfig

Source file repositories/reference/linux-study-clean/drivers/usb/core/Kconfig

File Facts

System
Linux kernel
Corpus path
drivers/usb/core/Kconfig
Extension
[no extension]
Size
5397 bytes
Lines
146
Domain
Driver Families
Bucket
drivers/usb
Inferred role
Driver Families: build/configuration rule
Status
atlas-only

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.

Dependency Surface

Detected Declarations

Annotated Snippet

# SPDX-License-Identifier: GPL-2.0
#
# USB Core configuration
#
config USB_ANNOUNCE_NEW_DEVICES
	bool "USB announce new devices"
	help
	  Say Y here if you want the USB core to always announce the
	  idVendor, idProduct, Manufacturer, Product, and SerialNumber
	  strings for every new USB device to the syslog.  This option is
	  usually used by distro vendors to help with debugging and to
	  let users know what specific device was added to the machine
	  in what location.

	  If you do not want this kind of information sent to the system
	  log, or have any doubts about this, say N here.

comment "Miscellaneous USB options"

config USB_DEFAULT_PERSIST
	bool "Enable USB persist by default"
	default y
	help
	  Say N here if you don't want USB power session persistence
	  enabled by default.  If you say N it will make suspended USB
	  devices that lose power get reenumerated as if they had been
	  unplugged, causing any mounted filesystems to be lost.  The
	  persist feature can still be enabled for individual devices
	  through the power/persist sysfs node. See
	  Documentation/driver-api/usb/persist.rst for more info.

	  If you have any questions about this, say Y here, only say N
	  if you know exactly what you are doing.

config USB_FEW_INIT_RETRIES
	bool "Limit USB device initialization to only a few retries"
	help
	  When a new USB device is detected, the kernel tries very hard
	  to initialize and enumerate it, with lots of nested retry loops.
	  This almost always works, but when it fails it can take a long time.
	  This option tells the kernel to make only a few retry attempts,
	  so that the total time required for a failed initialization is
	  no more than 30 seconds (as required by the USB OTG spec).

	  Say N here unless you require new-device enumeration failure to
	  occur within 30 seconds (as might be needed in an embedded
	  application).

config USB_DYNAMIC_MINORS
	bool "Dynamic USB minor allocation"
	help
	  If you say Y here, the USB subsystem will use dynamic minor
	  allocation for any device that uses the USB major number.
	  This means that you can have more than 16 of a single type
	  of device (like USB printers).

	  If you are unsure about this, say N here.

config USB_OTG
	bool "OTG support"
	depends on PM
	help
	  The most notable feature of USB OTG is support for a
	  "Dual-Role" device, which can act as either a device
	  or a host. The initial role is decided by the type of
	  plug inserted and can be changed later when two dual
	  role devices talk to each other.

	  Select this only if your board has Mini-AB/Micro-AB
	  connector.

Annotation

Implementation Notes