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 4.8.                 January 2017                             USB_STRING(9)