usb_add_config(9) [centos man page]

USB_ADD_CONFIG(9)					      Kernel Mode Gadget API						 USB_ADD_CONFIG(9)

NAME

       usb_add_config - add a configuration to a device.

SYNOPSIS

       int usb_add_config(struct usb_composite_dev * cdev, struct usb_configuration * config, int (*bind) (struct usb_configuration *));

ARGUMENTS

       cdev
	   wraps the USB gadget

       config
	   the configuration, with bConfigurationValue assigned

       bind
	   the configuration's bind function

CONTEXT

       single threaded during gadget setup

DESCRIPTION

       One of the main tasks of a composite bind() routine is to add each of the configurations it supports, using this routine.

       This function returns the value of the configuration's bind(), which is zero for success else a negative errno value. Binding
       configurations assigns global resources including string IDs, and per-configuration resources such as interface IDs and endpoints.

AUTHOR

       David Brownell <dbrownell@users.sourceforge.net>
	   Author.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014							 USB_ADD_CONFIG(9)

USB_INTERFACE_ID(9)					      Kernel Mode Gadget API					       USB_INTERFACE_ID(9)

NAME

       usb_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

DESCRIPTION

       usb_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 don'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.

COPYRIGHT

Kernel Hackers Manual 2.6.					     July 2010						       USB_INTERFACE_ID(9)