Ubuntu manuals

Provided by: linux-doc-2.6.15_2.6.15-23.39_all

NAME

       struct  usb_interface_cache  -  long-term  representation  of  a device
       interface

SYNOPSIS

       struct usb_interface_cache {
         unsigned num_altsetting;
         struct kref ref;
         struct usb_host_interface altsetting[0];
       };

MEMBERS

       num_altsetting
              number of altsettings defined.

       ref    reference counter.

       altsetting[0]
              variable-length array of  interface  structures,  one  for  each
              alternate  setting that may be selected. Each one includes a set
              of endpoint configurations. They will be in no particular order.

DESCRIPTION

       These  structures  persist  for  the  lifetime  of a usb_device, unlike
       struct usb_interface (which persists only as long as its  configuration
       is  installed).  The  altsetting  arrays  can be accessed through these
       structures at any time, permitting  comparison  of  configurations  and
       providing support for the /proc/bus/usb/devices pseudo-file.