usb: Add "portX/connect_type" attribute to expose usb port's connect type

Some platforms provide usb port connect types through ACPI. This
patch is to add this new attribute to expose these information
to user space.

Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-bus-usb b/Documentation/ABI/testing/sysfs-bus-usb
index b6fbe514a869..c8baaf53594a 100644
--- a/Documentation/ABI/testing/sysfs-bus-usb
+++ b/Documentation/ABI/testing/sysfs-bus-usb
@@ -227,3 +227,12 @@ Contact:	Lan Tianyu <tianyu.lan@intel.com>
 Description:
                 The /sys/bus/usb/devices/.../(hub interface)/portX
                 is usb port device's sysfs directory.
+
+What:           /sys/bus/usb/devices/.../(hub interface)/portX/connect_type
+Date:           January 2013
+Contact:        Lan Tianyu <tianyu.lan@intel.com>
+Description:
+                Some platforms provide usb port connect types through ACPI.
+                This attribute is to expose these information to user space.
+                The file will read "hotplug", "wired" and "not used" if the
+                information is available, and "unknown" otherwise.