drivers/usb/core/Kconfig

   1 #
   2 # USB Core configuration
   3 #
   4 config USB_DEBUG
   5         bool "USB verbose debug messages"
   6         help
   7           Say Y here if you want the USB core & hub drivers to produce a bunch
   8           of debug messages to the system log. Select this if you are having a
   9           problem with USB support and want to see more of what is going on.
  10
  11 config USB_ANNOUNCE_NEW_DEVICES
  12         bool "USB announce new devices"
  13         help
  14           Say Y here if you want the USB core to always announce the
  15           idVendor, idProduct, Manufacturer, Product, and SerialNumber
  16           strings for every new USB device to the syslog.  This option is
  17           usually used by distro vendors to help with debugging and to
  18           let users know what specific device was added to the machine
  19           in what location.
  20
  21           If you do not want this kind of information sent to the system
  22           log, or have any doubts about this, say N here.
  23
  24 comment "Miscellaneous USB options"
  25
  26 config USB_DEFAULT_PERSIST
  27         bool "Enable USB persist by default"
  28         default y
  29         help
  30           Say N here if you don't want USB power session persistence
  31           enabled by default.  If you say N it will make suspended USB
  32           devices that lose power get reenumerated as if they had been
  33           unplugged, causing any mounted filesystems to be lost.  The
  34           persist feature can still be enabled for individual devices
  35           through the power/persist sysfs node. See
  36           Documentation/usb/persist.txt for more info.
  37
  38           If you have any questions about this, say Y here, only say N
  39           if you know exactly what you are doing.
  40
  41 config USB_DYNAMIC_MINORS
  42         bool "Dynamic USB minor allocation"
  43         help
  44           If you say Y here, the USB subsystem will use dynamic minor
  45           allocation for any device that uses the USB major number.
  46           This means that you can have more than 16 of a single type
  47           of device (like USB printers).
  48
  49           If you are unsure about this, say N here.
  50
  51 config USB_OTG
  52         bool "OTG support"
  53         depends on PM_RUNTIME
  54         default n
  55         help
  56           The most notable feature of USB OTG is support for a
  57           "Dual-Role" device, which can act as either a device
  58           or a host. The initial role is decided by the type of
  59           plug inserted and can be changed later when two dual
  60           role devices talk to each other.
  61
  62           Select this only if your board has Mini-AB/Micro-AB
  63           connector.
  64
  65 config USB_OTG_WHITELIST
  66         bool "Rely on OTG Targeted Peripherals List"
  67         depends on USB_OTG || EXPERT
  68         default y if USB_OTG
  69         help
  70           If you say Y here, the "otg_whitelist.h" file will be used as a
  71           product whitelist, so USB peripherals not listed there will be
  72           rejected during enumeration.  This behavior is required by the
  73           USB OTG specification for all devices not on your product's
  74           "Targeted Peripherals List".  "Embedded Hosts" are likewise
  75           allowed to support only a limited number of peripherals.
  76
  77           Otherwise, peripherals not listed there will only generate a
  78           warning and enumeration will continue.  That's more like what
  79           normal Linux-USB hosts do (other than the warning), and is
  80           convenient for many stages of product development.
  81
  82 config USB_OTG_BLACKLIST_HUB
  83         bool "Disable external hubs"
  84         depends on USB_OTG || EXPERT
  85         help
  86           If you say Y here, then Linux will refuse to enumerate
  87           external hubs.  OTG hosts are allowed to reduce hardware
  88           and software costs by not supporting external hubs.  So
  89           are "Embedded Hosts" that don't offer OTG support.
  90