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Linux/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         default N
 14         help
 15           Say Y here if you want the USB core to always announce the
 16           idVendor, idProduct, Manufacturer, Product, and SerialNumber
 17           strings for every new USB device to the syslog.  This option is
 18           usually used by distro vendors to help with debugging and to
 19           let users know what specific device was added to the machine
 20           in what location.
 21 
 22           If you do not want this kind of information sent to the system
 23           log, or have any doubts about this, say N here.
 24 
 25 comment "Miscellaneous USB options"
 26 
 27 config USB_DEFAULT_PERSIST
 28         bool "Enable USB persist by default"
 29         default y
 30         help
 31           Say N here if you don't want USB power session persistence
 32           enabled by default.  If you say N it will make suspended USB
 33           devices that lose power get reenumerated as if they had been
 34           unplugged, causing any mounted filesystems to be lost.  The
 35           persist feature can still be enabled for individual devices
 36           through the power/persist sysfs node. See
 37           Documentation/usb/persist.txt for more info.
 38 
 39           If you have any questions about this, say Y here, only say N
 40           if you know exactly what you are doing.
 41 
 42 config USB_DYNAMIC_MINORS
 43         bool "Dynamic USB minor allocation"
 44         help
 45           If you say Y here, the USB subsystem will use dynamic minor
 46           allocation for any device that uses the USB major number.
 47           This means that you can have more than 16 of a single type
 48           of device (like USB printers).
 49 
 50           If you are unsure about this, say N here.
 51 
 52 config USB_OTG
 53         bool "OTG support"
 54         depends on PM_RUNTIME
 55         default n
 56         help
 57           The most notable feature of USB OTG is support for a
 58           "Dual-Role" device, which can act as either a device
 59           or a host. The initial role is decided by the type of
 60           plug inserted and can be changed later when two dual
 61           role devices talk to each other.
 62 
 63           Select this only if your board has Mini-AB/Micro-AB
 64           connector.
 65 
 66 config USB_OTG_WHITELIST
 67         bool "Rely on OTG Targeted Peripherals List"
 68         depends on USB_OTG || EXPERT
 69         default y if USB_OTG
 70         help
 71           If you say Y here, the "otg_whitelist.h" file will be used as a
 72           product whitelist, so USB peripherals not listed there will be
 73           rejected during enumeration.  This behavior is required by the
 74           USB OTG specification for all devices not on your product's
 75           "Targeted Peripherals List".  "Embedded Hosts" are likewise
 76           allowed to support only a limited number of peripherals.
 77 
 78           Otherwise, peripherals not listed there will only generate a
 79           warning and enumeration will continue.  That's more like what
 80           normal Linux-USB hosts do (other than the warning), and is
 81           convenient for many stages of product development.
 82 
 83 config USB_OTG_BLACKLIST_HUB
 84         bool "Disable external hubs"
 85         depends on USB_OTG || EXPERT
 86         help
 87           If you say Y here, then Linux will refuse to enumerate
 88           external hubs.  OTG hosts are allowed to reduce hardware
 89           and software costs by not supporting external hubs.  So
 90           are "Embedded Hosts" that don't offer OTG support.
 91 

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