struct usb_interface(9)
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.