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 config USB_ANNOUNCE_NEW_DEVICES
  13         bool "USB announce new devices"
  14         depends on USB
  15         default N
  16         help
  17           Say Y here if you want the USB core to always announce the
  18           idVendor, idProduct, Manufacturer, Product, and SerialNumber
  19           strings for every new USB device to the syslog.  This option is
  20           usually used by distro vendors to help with debugging and to
  21           let users know what specific device was added to the machine
  22           in what location.
  23
  24           If you do not want this kind of information sent to the system
  25           log, or have any doubts about this, say N here.
  26
  27 comment "Miscellaneous USB options"
  28         depends on USB
  29
  30 config USB_DEVICEFS
  31         bool "USB device filesystem (DEPRECATED)"
  32         depends on USB
  33         ---help---
  34           If you say Y here (and to "/proc file system support" in the "File
  35           systems" section, above), you will get a file /proc/bus/usb/devices
  36           which lists the devices currently connected to your USB bus or
  37           busses, and for every connected device a file named
  38           "/proc/bus/usb/xxx/yyy", where xxx is the bus number and yyy the
  39           device number; the latter files can be used by user space programs
  40           to talk directly to the device. These files are "virtual", meaning
  41           they are generated on the fly and not stored on the hard drive.
  42
  43           You may need to mount the usbfs file system to see the files, use
  44           mount -t usbfs none /proc/bus/usb
  45
  46           For the format of the various /proc/bus/usb/ files, please read
  47           <file:Documentation/usb/proc_usb_info.txt>.
  48
  49           Modern Linux systems do not use this.
  50
  51           Usbfs entries are files and not character devices; usbfs can't
  52           handle Access Control Lists (ACL) which are the default way to
  53           grant access to USB devices for untrusted users of a desktop
  54           system.
  55
  56           The usbfs functionality is replaced by real device-nodes managed by
  57           udev.  These nodes lived in /dev/bus/usb and are used by libusb.
  58
  59 config USB_DEVICE_CLASS
  60         bool "USB device class-devices (DEPRECATED)"
  61         depends on USB
  62         default y
  63         ---help---
  64           Userspace access to USB devices is granted by device-nodes exported
  65           directly from the usbdev in sysfs. Old versions of the driver
  66           core and udev needed additional class devices to export device nodes.
  67
  68           These additional devices are difficult to handle in userspace, if
  69           information about USB interfaces must be available. One device
  70           contains the device node, the other device contains the interface
  71           data. Both devices are at the same level in sysfs (siblings) and one
  72           can't access the other. The device node created directly by the
  73           usb device is the parent device of the interface and therefore
  74           easily accessible from the interface event.
  75
  76           This option provides backward compatibility for libusb device
  77           nodes (lsusb) when usbfs is not used, and the following udev rule
  78           doesn't exist:
  79             SUBSYSTEM=="usb", ACTION=="add", ENV{DEVTYPE}=="usb_device", \
  80             NAME="bus/usb/$env{BUSNUM}/$env{DEVNUM}", MODE="0644"
  81
  82 config USB_DYNAMIC_MINORS
  83         bool "Dynamic USB minor allocation"
  84         depends on USB
  85         help
  86           If you say Y here, the USB subsystem will use dynamic minor
  87           allocation for any device that uses the USB major number.
  88           This means that you can have more than 16 of a single type
  89           of device (like USB printers).
  90
  91           If you are unsure about this, say N here.
  92
  93 config USB_SUSPEND
  94         bool "USB runtime power management (suspend/resume and wakeup)"
  95         depends on USB && PM_RUNTIME
  96         help
  97           If you say Y here, you can use driver calls or the sysfs
  98           "power/level" file to suspend or resume individual USB
  99           peripherals and to enable or disable autosuspend (see
 100           Documentation/usb/power-management.txt for more details).
 101
 102           Also, USB "remote wakeup" signaling is supported, whereby some
 103           USB devices (like keyboards and network adapters) can wake up
 104           their parent hub.  That wakeup cascades up the USB tree, and
 105           could wake the system from states like suspend-to-RAM.
 106
 107           If you are unsure about this, say N here.
 108
 109 config USB_OTG
 110         bool
 111         depends on USB && EXPERIMENTAL
 112         select USB_SUSPEND
 113         default n
 114
 115
 116 config USB_OTG_WHITELIST
 117         bool "Rely on OTG Targeted Peripherals List"
 118         depends on USB_OTG || EMBEDDED
 119         default y if USB_OTG
 120         default n if EMBEDDED
 121         help
 122           If you say Y here, the "otg_whitelist.h" file will be used as a
 123           product whitelist, so USB peripherals not listed there will be
 124           rejected during enumeration.  This behavior is required by the
 125           USB OTG specification for all devices not on your product's
 126           "Targeted Peripherals List".  "Embedded Hosts" are likewise
 127           allowed to support only a limited number of peripherals.
 128
 129           Otherwise, peripherals not listed there will only generate a
 130           warning and enumeration will continue.  That's more like what
 131           normal Linux-USB hosts do (other than the warning), and is
 132           convenient for many stages of product development.
 133
 134 config USB_OTG_BLACKLIST_HUB
 135         bool "Disable external hubs"
 136         depends on USB_OTG || EMBEDDED
 137         help
 138           If you say Y here, then Linux will refuse to enumerate
 139           external hubs.  OTG hosts are allowed to reduce hardware
 140           and software costs by not supporting external hubs.  So
 141           are "Embedded Hosts" that don't offer OTG support.
 142