The file will be present for all speeds of USB devices, and will
always read "no" for USB 1.1 and USB 2.0 devices.
-What: /sys/bus/usb/devices/.../(hub interface)/portX
+What: /sys/bus/usb/devices/.../<hub_interface>/port<X>
Date: August 2012
Contact: Lan Tianyu <tianyu.lan@intel.com>
Description:
- The /sys/bus/usb/devices/.../(hub interface)/portX
+ The /sys/bus/usb/devices/.../<hub_interface>/port<X>
is usb port device's sysfs directory.
-What: /sys/bus/usb/devices/.../(hub interface)/portX/connect_type
+What: /sys/bus/usb/devices/.../<hub_interface>/port<X>/connect_type
Date: January 2013
Contact: Lan Tianyu <tianyu.lan@intel.com>
Description:
The file will read "hotplug", "hardwired" and "not used" if the
information is available, and "unknown" otherwise.
-What: /sys/bus/usb/devices/.../(hub interface)/portX/location
+What: /sys/bus/usb/devices/.../<hub_interface>/port<X>/location
Date: October 2018
Contact: Bjørn Mork <bjorn@mork.no>
Description:
raw location value as a hex integer.
-What: /sys/bus/usb/devices/.../(hub interface)/portX/quirks
+What: /sys/bus/usb/devices/.../<hub_interface>/port<X>/quirks
Date: May 2018
Contact: Nicolas Boichat <drinkcat@chromium.org>
Description:
used to help make enumeration work better on some high speed
devices.
-What: /sys/bus/usb/devices/.../(hub interface)/portX/over_current_count
+What: /sys/bus/usb/devices/.../<hub_interface>/port<X>/over_current_count
Date: February 2018
Contact: Richard Leitner <richard.leitner@skidata.com>
Description:
Any time this value changes the corresponding hub device will send a
udev event with the following attributes::
- OVER_CURRENT_PORT=/sys/bus/usb/devices/.../(hub interface)/portX
+ OVER_CURRENT_PORT=/sys/bus/usb/devices/.../<hub_interface>/port<X>
OVER_CURRENT_COUNT=[current value of this sysfs attribute]
-What: /sys/bus/usb/devices/.../(hub interface)/portX/usb3_lpm_permit
+What: /sys/bus/usb/devices/.../<hub_interface>/port<X>/usb3_lpm_permit
Date: November 2015
Contact: Lu Baolu <baolu.lu@linux.intel.com>
Description: