drivers/usb/core/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0
   2 #
   3 # USB Core configuration
   4 #
   5 config USB_ANNOUNCE_NEW_DEVICES
   6         bool "USB announce new devices"
   7         help
   8           Say Y here if you want the USB core to always announce the
   9           idVendor, idProduct, Manufacturer, Product, and SerialNumber
  10           strings for every new USB device to the syslog.  This option is
  11           usually used by distro vendors to help with debugging and to
  12           let users know what specific device was added to the machine
  13           in what location.
  14
  15           If you do not want this kind of information sent to the system
  16           log, or have any doubts about this, say N here.
  17
  18 comment "Miscellaneous USB options"
  19
  20 config USB_DEFAULT_PERSIST
  21         bool "Enable USB persist by default"
  22         default y
  23         help
  24           Say N here if you don't want USB power session persistence
  25           enabled by default.  If you say N it will make suspended USB
  26           devices that lose power get reenumerated as if they had been
  27           unplugged, causing any mounted filesystems to be lost.  The
  28           persist feature can still be enabled for individual devices
  29           through the power/persist sysfs node. See
  30           Documentation/driver-api/usb/persist.rst for more info.
  31
  32           If you have any questions about this, say Y here, only say N
  33           if you know exactly what you are doing.
  34
  35 config USB_DYNAMIC_MINORS
  36         bool "Dynamic USB minor allocation"
  37         help
  38           If you say Y here, the USB subsystem will use dynamic minor
  39           allocation for any device that uses the USB major number.
  40           This means that you can have more than 16 of a single type
  41           of device (like USB printers).
  42
  43           If you are unsure about this, say N here.
  44
  45 config USB_OTG
  46         bool "OTG support"
  47         depends on PM
  48         help
  49           The most notable feature of USB OTG is support for a
  50           "Dual-Role" device, which can act as either a device
  51           or a host. The initial role is decided by the type of
  52           plug inserted and can be changed later when two dual
  53           role devices talk to each other.
  54
  55           Select this only if your board has Mini-AB/Micro-AB
  56           connector.
  57
  58 config USB_OTG_WHITELIST
  59         bool "Rely on OTG and EH Targeted Peripherals List"
  60         depends on USB
  61         help
  62           If you say Y here, the "otg_whitelist.h" file will be used as a
  63           product whitelist, so USB peripherals not listed there will be
  64           rejected during enumeration.  This behavior is required by the
  65           USB OTG and EH specification for all devices not on your product's
  66           "Targeted Peripherals List".  "Embedded Hosts" are likewise
  67           allowed to support only a limited number of peripherals.
  68
  69 config USB_OTG_BLACKLIST_HUB
  70         bool "Disable external hubs"
  71         depends on USB_OTG || EXPERT
  72         help
  73           If you say Y here, then Linux will refuse to enumerate
  74           external hubs.  OTG hosts are allowed to reduce hardware
  75           and software costs by not supporting external hubs.  So
  76           are "Embedded Hosts" that don't offer OTG support.
  77
  78 config USB_OTG_FSM
  79         tristate "USB 2.0 OTG FSM implementation"
  80         depends on USB && USB_OTG
  81         select USB_PHY
  82         help
  83           Implements OTG Finite State Machine as specified in On-The-Go
  84           and Embedded Host Supplement to the USB Revision 2.0 Specification.
  85
  86 config USB_LEDS_TRIGGER_USBPORT
  87         tristate "USB port LED trigger"
  88         depends on USB && LEDS_TRIGGERS
  89         help
  90           This driver allows LEDs to be controlled by USB events. Enabling this
  91           trigger allows specifying list of USB ports that should turn on LED
  92           when some USB device gets connected.
  93
  94 config USB_AUTOSUSPEND_DELAY
  95         int "Default autosuspend delay"
  96         depends on USB
  97         default 2
  98         help
  99           The default autosuspend delay in seconds.  Can be overridden
 100           with the usbcore.autosuspend command line or module parameter.
 101
 102           The default value Linux has always had is 2 seconds.  Change
 103           this value if you want a different delay and cannot modify
 104           the command line or module parameter.