c066475e1f
Might speed up some systems. If nothing else, a bad driver should not take the whole USB subsystem down with it. Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
122 lines
4.1 KiB
Plaintext
122 lines
4.1 KiB
Plaintext
#
|
|
# 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.
|
|
|