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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.
comment "Miscellaneous USB options"
depends on USB
config USB_DEVICEFS
bool "USB device filesystem"
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>.
Most users want to say Y here.
config USB_BANDWIDTH
bool "Enforce USB bandwidth allocation (EXPERIMENTAL)"
depends on USB && EXPERIMENTAL
help
If you say Y here, the USB subsystem enforces USB bandwidth
allocation and will prevent some device opens from succeeding
if they would cause USB bandwidth usage to go above 90% of
the bus bandwidth.
If you say N here, these conditions will cause warning messages
about USB bandwidth usage to be logged and some devices or
drivers may not work correctly.
config USB_DYNAMIC_MINORS
bool "Dynamic USB minor allocation (EXPERIMENTAL)"
depends on USB && EXPERIMENTAL
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 selective suspend/resume and wakeup (EXPERIMENTAL)"
depends on USB && PM && EXPERIMENTAL
help
If you say Y here, you can use driver calls or the sysfs
"power/state" file to suspend or resume individual USB
peripherals.
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_MULTITHREAD_PROBE
bool "USB Multi-threaded probe (EXPERIMENTAL)"
depends on USB && EXPERIMENTAL
default n
help
Say Y here if you want the USB core to spawn a new thread for
every USB device that is probed. This can cause a small speedup
in boot times on systems with a lot of different USB devices.
This option should be safe to enable, but if any odd probing
problems are found, please disable it, or dynamically turn it
off in the /sys/module/usbcore/parameters/multithread_probe
file
When in doubt, say N.
config USB_OTG
bool
depends on USB && EXPERIMENTAL
select USB_SUSPEND
default n
config USB_OTG_WHITELIST
bool "Rely on OTG Targeted Peripherals List"
depends on USB_OTG
default y
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".
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
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.
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