drivers/usb/core/Kconfig

   1 #
   2 # USB Core configuration
   3 #
   4 config USB_DEBUG
   5         bool "USB verbose debug messages"
   6         depends on USB
   7         help
   8           Say Y here if you want the USB core & hub drivers to produce a bunch
   9           of debug messages to the system log. Select this if you are having a
  10           problem with USB support and want to see more of what is going on.
  11
  12 comment "Miscellaneous USB options"
  13         depends on USB
  14
  15 config USB_DEVICEFS
  16         bool "USB device filesystem"
  17         depends on USB
  18         ---help---
  19           If you say Y here (and to "/proc file system support" in the "File
  20           systems" section, above), you will get a file /proc/bus/usb/devices
  21           which lists the devices currently connected to your USB bus or
  22           busses, and for every connected device a file named
  23           "/proc/bus/usb/xxx/yyy", where xxx is the bus number and yyy the
  24           device number; the latter files can be used by user space programs
  25           to talk directly to the device. These files are "virtual", meaning
  26           they are generated on the fly and not stored on the hard drive.
  27
  28           You may need to mount the usbfs file system to see the files, use
  29           mount -t usbfs none /proc/bus/usb
  30
  31           For the format of the various /proc/bus/usb/ files, please read
  32           <file:Documentation/usb/proc_usb_info.txt>.
  33
  34           Most users want to say Y here.
  35
  36 config USB_DYNAMIC_MINORS
  37         bool "Dynamic USB minor allocation (EXPERIMENTAL)"
  38         depends on USB && EXPERIMENTAL
  39         help
  40           If you say Y here, the USB subsystem will use dynamic minor
  41           allocation for any device that uses the USB major number.
  42           This means that you can have more than 16 of a single type
  43           of device (like USB printers).
  44
  45           If you are unsure about this, say N here.
  46
  47 config USB_SUSPEND
  48         bool "USB selective suspend/resume and wakeup (EXPERIMENTAL)"
  49         depends on USB && PM && EXPERIMENTAL
  50         help
  51           If you say Y here, you can use driver calls or the sysfs
  52           "power/state" file to suspend or resume individual USB
  53           peripherals.
  54
  55           Also, USB "remote wakeup" signaling is supported, whereby some
  56           USB devices (like keyboards and network adapters) can wake up
  57           their parent hub.  That wakeup cascades up the USB tree, and
  58           could wake the system from states like suspend-to-RAM.
  59
  60           If you are unsure about this, say N here.
  61
  62 config USB_OTG
  63         bool
  64         depends on USB && EXPERIMENTAL
  65         select USB_SUSPEND
  66         default n
  67
  68
  69 config USB_OTG_WHITELIST
  70         bool "Rely on OTG Targeted Peripherals List"
  71         depends on USB_OTG
  72         default y
  73         help
  74           If you say Y here, the "otg_whitelist.h" file will be used as a
  75           product whitelist, so USB peripherals not listed there will be
  76           rejected during enumeration.  This behavior is required by the
  77           USB OTG specification for all devices not on your product's
  78           "Targeted Peripherals List".
  79
  80           Otherwise, peripherals not listed there will only generate a
  81           warning and enumeration will continue.  That's more like what
  82           normal Linux-USB hosts do (other than the warning), and is
  83           convenient for many stages of product development.
  84
  85 config USB_OTG_BLACKLIST_HUB
  86         bool "Disable external hubs"
  87         depends on USB_OTG
  88         help
  89           If you say Y here, then Linux will refuse to enumerate
  90           external hubs.  OTG hosts are allowed to reduce hardware
  91           and software costs by not supporting external hubs.
  92