centos man page for usb_string

USB_STRING(9)							   USB Core APIs						     USB_STRING(9)

NAME
       usb_string - returns UTF-8 version of a string descriptor

SYNOPSIS
       int usb_string(struct usb_device * dev, int index, char * buf, size_t size);

ARGUMENTS
       dev
	   the device whose string descriptor is being retrieved

       index
	   the number of the descriptor

       buf
	   where to put the string

       size
	   how big is "buf"?

CONTEXT
       !in_interrupt ()

DESCRIPTION
       This converts the UTF-16LE encoded strings returned by devices, from usb_get_string_descriptor, to null-terminated UTF-8 encoded ones that
       are more usable in most kernel contexts. Note that this function chooses strings in the first language supported by the device.

       This call is synchronous, and may not be used in an interrupt context.

RETURN
       length of the string (>= 0) or usb_control_msg status (< 0).

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							     USB_STRING(9)