tree 3fadff48cc8a9e0595832c94147bd6d6af2a05aa
parent 70fc20d4dc7c8990a508411db1ee441ae9ee5034
author Gerd Hoffmann <kraxel@redhat.com> 1326211168 +0100
committer Gerd Hoffmann <kraxel@redhat.com> 1328869908 +0100

usb: add usb_find_device()

Add usb_find_device().  This function will check whenever a device with
a specific address is connected to the specified port.  Usually this
will just check state and address of the device hooked up to the port,
but in case of a hub it will ask the hub to check all hub ports for a
matching device.

This patch doesn't put the code into use yet, see the following patches
for details.

The master plan is to separate device lookup and packet processing.
Right now the usb code simply walks all devices, calls
usb_handle_packet() on each until one accepts the packet (by returning
something different that USB_RET_NODEV).  I want to have a device lookup
first, then call usb_handle_packet() once, for the device which actually
processes the packet.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>