+====================
USB port LED trigger
====================
echoing "1" to a chosen port.
Please note that this trigger allows selecting multiple USB ports for a single
-LED. This can be useful in two cases:
+LED.
+
+This can be useful in two cases:
1) Device with single USB LED and few physical ports
+====================================================
In such a case LED will be turned on as long as there is at least one connected
USB device.
2) Device with a physical port handled by few controllers
+=========================================================
Some devices may have one controller per PHY standard. E.g. USB 3.0 physical
port may be handled by ohci-platform, ehci-platform and xhci-hcd. If there is
This trigger can be activated from user space on led class devices as shown
-below:
+below::
echo usbport > trigger
This adds sysfs attributes to the LED that are documented in:
Documentation/ABI/testing/sysfs-class-led-trigger-usbport
-Example use-case:
+Example use-case::
echo usbport > trigger
echo 1 > ports/usb1-port1