usb_gadget_get_string(9) centos man page | unix.com

USB_GADGET_GET_STRIN(9) 				      Kernel Mode Gadget API					   USB_GADGET_GET_STRIN(9)

NAME
       usb_gadget_get_string - fill out a string descriptor

SYNOPSIS
       int usb_gadget_get_string(struct usb_gadget_strings * table, int id, u8 * buf);

ARGUMENTS
       table
	   of c strings encoded using UTF-8

       id
	   string id, from low byte of wValue in get string descriptor

       buf
	   at least 256 bytes, must be 16-bit aligned

DESCRIPTION
       Finds the UTF-8 string matching the ID, and converts it into a string descriptor in utf16-le. Returns length of descriptor (always even) or
       negative errno

       If your driver needs stings in multiple languages, you'll probably "switch (wIndex) { ... }" in your ep0 string descriptor logic, using
       this routine after choosing which set of UTF-8 strings to use. Note that US-ASCII is a strict subset of UTF-8; any string bytes with the
       eighth bit set will be multibyte UTF-8 characters, not ISO-8859/1 characters (which are also widely used in C strings).

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

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   USB_GADGET_GET_STRIN(9)