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authorSrikant Patnaik2015-01-13 15:08:24 +0530
committerSrikant Patnaik2015-01-13 15:08:24 +0530
commit97327692361306d1e6259021bc425e32832fdb50 (patch)
treefe9088f3248ec61e24f404f21b9793cb644b7f01 /drivers/usb/core/Kconfig
parent2d05a8f663478a44e088d122e0d62109bbc801d0 (diff)
parenta3a8b90b61e21be3dde9101c4e86c881e0f06210 (diff)
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dirty fix to merging
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+#
+# USB Core configuration
+#
+config USB_DEBUG
+ bool "USB verbose debug messages"
+ depends on USB
+ help
+ Say Y here if you want the USB core & hub drivers to produce a bunch
+ of debug messages to the system log. Select this if you are having a
+ problem with USB support and want to see more of what is going on.
+
+config USB_ANNOUNCE_NEW_DEVICES
+ bool "USB announce new devices"
+ depends on USB
+ default N
+ help
+ Say Y here if you want the USB core to always announce the
+ idVendor, idProduct, Manufacturer, Product, and SerialNumber
+ strings for every new USB device to the syslog. This option is
+ usually used by distro vendors to help with debugging and to
+ let users know what specific device was added to the machine
+ in what location.
+
+ If you do not want this kind of information sent to the system
+ log, or have any doubts about this, say N here.
+
+comment "Miscellaneous USB options"
+ depends on USB
+
+config USB_DEVICEFS
+ bool "USB device filesystem (DEPRECATED)"
+ depends on USB
+ ---help---
+ If you say Y here (and to "/proc file system support" in the "File
+ systems" section, above), you will get a file /proc/bus/usb/devices
+ which lists the devices currently connected to your USB bus or
+ busses, and for every connected device a file named
+ "/proc/bus/usb/xxx/yyy", where xxx is the bus number and yyy the
+ device number; the latter files can be used by user space programs
+ to talk directly to the device. These files are "virtual", meaning
+ they are generated on the fly and not stored on the hard drive.
+
+ You may need to mount the usbfs file system to see the files, use
+ mount -t usbfs none /proc/bus/usb
+
+ For the format of the various /proc/bus/usb/ files, please read
+ <file:Documentation/usb/proc_usb_info.txt>.
+
+ Modern Linux systems do not use this.
+
+ Usbfs entries are files and not character devices; usbfs can't
+ handle Access Control Lists (ACL) which are the default way to
+ grant access to USB devices for untrusted users of a desktop
+ system.
+
+ The usbfs functionality is replaced by real device-nodes managed by
+ udev. These nodes lived in /dev/bus/usb and are used by libusb.
+
+config USB_DEVICE_CLASS
+ bool "USB device class-devices (DEPRECATED)"
+ depends on USB
+ default y
+ ---help---
+ Userspace access to USB devices is granted by device-nodes exported
+ directly from the usbdev in sysfs. Old versions of the driver
+ core and udev needed additional class devices to export device nodes.
+
+ These additional devices are difficult to handle in userspace, if
+ information about USB interfaces must be available. One device
+ contains the device node, the other device contains the interface
+ data. Both devices are at the same level in sysfs (siblings) and one
+ can't access the other. The device node created directly by the
+ usb device is the parent device of the interface and therefore
+ easily accessible from the interface event.
+
+ This option provides backward compatibility for libusb device
+ nodes (lsusb) when usbfs is not used, and the following udev rule
+ doesn't exist:
+ SUBSYSTEM=="usb", ACTION=="add", ENV{DEVTYPE}=="usb_device", \
+ NAME="bus/usb/$env{BUSNUM}/$env{DEVNUM}", MODE="0644"
+
+config USB_DYNAMIC_MINORS
+ bool "Dynamic USB minor allocation"
+ depends on USB
+ help
+ If you say Y here, the USB subsystem will use dynamic minor
+ allocation for any device that uses the USB major number.
+ This means that you can have more than 16 of a single type
+ of device (like USB printers).
+
+ If you are unsure about this, say N here.
+
+config USB_SUSPEND
+ bool "USB runtime power management (autosuspend) and wakeup"
+ depends on USB && PM_RUNTIME
+ help
+ If you say Y here, you can use driver calls or the sysfs
+ "power/control" file to enable or disable autosuspend for
+ individual USB peripherals (see
+ Documentation/usb/power-management.txt for more details).
+
+ Also, USB "remote wakeup" signaling is supported, whereby some
+ USB devices (like keyboards and network adapters) can wake up
+ their parent hub. That wakeup cascades up the USB tree, and
+ could wake the system from states like suspend-to-RAM.
+
+ If you are unsure about this, say N here.
+
+config USB_OTG
+ bool "OTG support"
+ depends on USB && EXPERIMENTAL
+ depends on USB_SUSPEND
+ default n
+ help
+ The most notable feature of USB OTG is support for a
+ "Dual-Role" device, which can act as either a device
+ or a host. The initial role is decided by the type of
+ plug inserted and can be changed later when two dual
+ role devices talk to each other.
+
+ Select this only if your board has Mini-AB/Micro-AB
+ connector.
+
+config USB_OTG_WHITELIST
+ bool "Rely on OTG Targeted Peripherals List"
+ depends on USB_OTG || EXPERT
+ default y if USB_OTG
+ default n if EXPERT
+ help
+ If you say Y here, the "otg_whitelist.h" file will be used as a
+ product whitelist, so USB peripherals not listed there will be
+ rejected during enumeration. This behavior is required by the
+ USB OTG specification for all devices not on your product's
+ "Targeted Peripherals List". "Embedded Hosts" are likewise
+ allowed to support only a limited number of peripherals.
+
+ Otherwise, peripherals not listed there will only generate a
+ warning and enumeration will continue. That's more like what
+ normal Linux-USB hosts do (other than the warning), and is
+ convenient for many stages of product development.
+
+config USB_OTG_BLACKLIST_HUB
+ bool "Disable external hubs"
+ depends on USB_OTG || EXPERT
+ help
+ If you say Y here, then Linux will refuse to enumerate
+ external hubs. OTG hosts are allowed to reduce hardware
+ and software costs by not supporting external hubs. So
+ are "Embedded Hosts" that don't offer OTG support.
+