![Greg Kroah-Hartman](/assets/img/avatar_default.png)
This reverts commit cc71329b3b
, so that
Red Hat machines can boot properly. It seems that the Red Hat initrd
code tries to watch the /proc/bus/usb/devices file to monitor usb
devices showing up. While this task is prone to lots of races and does
not show the true state of the system, they seem to like it.
So for now, don't move this option under the EMBEDDED config option.
Cc: Scott James Remnant <scott@canonical.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Dave Airlie <airlied@gmail.com>
Cc: Peter Jones <pjones@redhat.com>
Cc: Jeff Chua <jeff.chua.linux@gmail.com>
Cc: Dave Jones <davej@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
143 lines
5.3 KiB
Plaintext
143 lines
5.3 KiB
Plaintext
#
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# USB Core configuration
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#
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config USB_DEBUG
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bool "USB verbose debug messages"
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depends on USB
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help
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Say Y here if you want the USB core & hub drivers to produce a bunch
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of debug messages to the system log. Select this if you are having a
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problem with USB support and want to see more of what is going on.
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config USB_ANNOUNCE_NEW_DEVICES
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bool "USB announce new devices"
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depends on USB
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default N
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help
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Say Y here if you want the USB core to always announce the
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idVendor, idProduct, Manufacturer, Product, and SerialNumber
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strings for every new USB device to the syslog. This option is
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usually used by distro vendors to help with debugging and to
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let users know what specific device was added to the machine
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in what location.
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If you do not want this kind of information sent to the system
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log, or have any doubts about this, say N here.
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comment "Miscellaneous USB options"
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depends on USB
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config USB_DEVICEFS
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bool "USB device filesystem (DEPRECATED)"
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depends on USB
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---help---
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If you say Y here (and to "/proc file system support" in the "File
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systems" section, above), you will get a file /proc/bus/usb/devices
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which lists the devices currently connected to your USB bus or
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busses, and for every connected device a file named
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"/proc/bus/usb/xxx/yyy", where xxx is the bus number and yyy the
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device number; the latter files can be used by user space programs
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to talk directly to the device. These files are "virtual", meaning
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they are generated on the fly and not stored on the hard drive.
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You may need to mount the usbfs file system to see the files, use
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mount -t usbfs none /proc/bus/usb
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For the format of the various /proc/bus/usb/ files, please read
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<file:Documentation/usb/proc_usb_info.txt>.
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Modern Linux systems do not use this.
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Usbfs entries are files and not character devices; usbfs can't
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handle Access Control Lists (ACL) which are the default way to
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grant access to USB devices for untrusted users of a desktop
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system.
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The usbfs functionality is replaced by real device-nodes managed by
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udev. These nodes lived in /dev/bus/usb and are used by libusb.
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config USB_DEVICE_CLASS
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bool "USB device class-devices (DEPRECATED)"
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depends on USB
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default y
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---help---
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Userspace access to USB devices is granted by device-nodes exported
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directly from the usbdev in sysfs. Old versions of the driver
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core and udev needed additional class devices to export device nodes.
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These additional devices are difficult to handle in userspace, if
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information about USB interfaces must be available. One device
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contains the device node, the other device contains the interface
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data. Both devices are at the same level in sysfs (siblings) and one
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can't access the other. The device node created directly by the
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usb device is the parent device of the interface and therefore
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easily accessible from the interface event.
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This option provides backward compatibility for libusb device
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nodes (lsusb) when usbfs is not used, and the following udev rule
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doesn't exist:
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SUBSYSTEM=="usb", ACTION=="add", ENV{DEVTYPE}=="usb_device", \
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NAME="bus/usb/$env{BUSNUM}/$env{DEVNUM}", MODE="0644"
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config USB_DYNAMIC_MINORS
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bool "Dynamic USB minor allocation"
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depends on USB
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help
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If you say Y here, the USB subsystem will use dynamic minor
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allocation for any device that uses the USB major number.
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This means that you can have more than 16 of a single type
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of device (like USB printers).
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If you are unsure about this, say N here.
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config USB_SUSPEND
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bool "USB selective suspend/resume and wakeup"
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depends on USB && PM
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help
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If you say Y here, you can use driver calls or the sysfs
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"power/level" file to suspend or resume individual USB
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peripherals and to enable or disable autosuspend (see
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Documentation/usb/power-management.txt for more details).
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Also, USB "remote wakeup" signaling is supported, whereby some
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USB devices (like keyboards and network adapters) can wake up
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their parent hub. That wakeup cascades up the USB tree, and
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could wake the system from states like suspend-to-RAM.
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If you are unsure about this, say N here.
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config USB_OTG
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bool
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depends on USB && EXPERIMENTAL
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select USB_SUSPEND
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default n
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config USB_OTG_WHITELIST
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bool "Rely on OTG Targeted Peripherals List"
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depends on USB_OTG || EMBEDDED
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default y if USB_OTG
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default n if EMBEDDED
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help
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If you say Y here, the "otg_whitelist.h" file will be used as a
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product whitelist, so USB peripherals not listed there will be
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rejected during enumeration. This behavior is required by the
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USB OTG specification for all devices not on your product's
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"Targeted Peripherals List". "Embedded Hosts" are likewise
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allowed to support only a limited number of peripherals.
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Otherwise, peripherals not listed there will only generate a
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warning and enumeration will continue. That's more like what
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normal Linux-USB hosts do (other than the warning), and is
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convenient for many stages of product development.
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config USB_OTG_BLACKLIST_HUB
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bool "Disable external hubs"
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depends on USB_OTG || EMBEDDED
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help
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If you say Y here, then Linux will refuse to enumerate
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external hubs. OTG hosts are allowed to reduce hardware
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and software costs by not supporting external hubs. So
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are "Embedded Hosts" that don't offer OTG support.
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