USB_INTERFACE_ID(9) Kernel Mode Gadget API USB_INTERFACE_ID(9)NAMEusb_interface_id - allocate an unused interface ID
SYNOPSIS
int usb_interface_id(struct usb_configuration * config,
struct usb_function * function);
ARGUMENTS
config
configuration associated with the interface
function
function handling the interface
CONTEXT
single threaded during gadget setup
DESCRIPTIONusb_interface_id is called from usb_function.bind callbacks to allocate
new interface IDs. The function driver will then store that ID in
interface, association, CDC union, and other descriptors. It will also
handle any control requests targetted at that interface, particularly
changing its altsetting via set_alt. There may also be class-specific
or vendor-specific requests to handle.
All interface identifier should be allocated using this routine, to
ensure that for example different functions donĀ“t wrongly assign
different meanings to the same identifier. Note that since interface
identifers are configuration-specific, functions used in more than one
configuration (or more than once in a given configuration) need
multiple versions of the relevant descriptors.
Returns the interface ID which was allocated; or -ENODEV if no more
interface IDs can be allocated.
AUTHOR
David Brownell <dbrownell@users.sourceforge.net>
Author.
COPYRIGHTKernel Hackers Manual 2.6. November 2013 USB_INTERFACE_ID(9)