centos man page for usb_string_ids_n

USB_STRING_IDS_N(9)					      Kernel Mode Gadget API					       USB_STRING_IDS_N(9)

NAME
       usb_string_ids_n - allocate unused string IDs in batch

SYNOPSIS
       int usb_string_ids_n(struct usb_composite_dev * c, unsigned n);

ARGUMENTS
       c
	   the device whose string descriptor IDs are being allocated

       n
	   number of string IDs to allocate

CONTEXT
       single threaded during gadget setup

DESCRIPTION
       Returns the first requested ID. This ID and next n-1 IDs are now valid IDs. At least provided that n is non-zero because if it is, returns
       last requested ID which is now very useful information.

       usb_string_ids_n() is called from bind callbacks to allocate string IDs. Drivers for functions, configurations, or gadgets will then store
       that ID in the appropriate descriptors and string table.

       All string identifier should be allocated using this, usb_string_id() or usb_string_ids_n() routine, to ensure that for example different
       functions don't wrongly assign different meanings to the same identifier.

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

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						       USB_STRING_IDS_N(9)