usb: make usb port a real device

This patch turns each USB port on a hub into a new struct device.  This
new device has the USB hub interface device as its parent.  The port
devices are stored in a new structure (usb_port), and an array of
usb_ports are dynamically allocated once we know how many ports the USB
hub has.

Move the port_owner variable out of usb_hub and into this new structure.

A new file will be created in the hub interface sysfs directory, so
add documentation.

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

1 files changed, 7 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-bus-usb b/Documentation/ABI/testing/sysfs-bus-usb
index 5f75f8f7df3..b6fbe514a86 100644
--- a/Documentation/ABI/testing/sysfs-bus-usb
+++ b/Documentation/ABI/testing/sysfs-bus-usb
@@ -220,3 +220,10 @@ Description:
                 If the device doesn't support LTM, the file will read "no".
                 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
+Date:           August 2012
+Contact:        Lan Tianyu <tianyu.lan@intel.com>
+Description:
+                The /sys/bus/usb/devices/.../(hub interface)/portX
+                is usb port device's sysfs directory.