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USB_GET_DESCRIPTOR(9)                     USB Core APIs                     USB_GET_DESCRIPTOR(9)



NAME
       usb_get_descriptor - issues a generic GET_DESCRIPTOR request

SYNOPSIS
       int usb_get_descriptor(struct usb_device * dev, unsigned char type, unsigned char index,
                              void * buf, int size);

ARGUMENTS
       dev
           the device whose descriptor is being retrieved

       type
           the descriptor type (USB_DT_*)

       index
           the number of the descriptor

       buf
           where to put the descriptor

       size
           how big is “buf”?

CONTEXT
       !in_interrupt ()

DESCRIPTION
       Gets a USB descriptor. Convenience functions exist to simplify getting some types of
       descriptors. Use usb_get_string or usb_string for USB_DT_STRING. Device (USB_DT_DEVICE)
       and configuration descriptors (USB_DT_CONFIG) are part of the device structure. In
       addition to a number of USB-standard descriptors, some devices also use class-specific or
       vendor-specific descriptors.

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

RETURN
       The number of bytes received on success, or else the status code returned by the
       underlying usb_control_msg call.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                     USB_GET_DESCRIPTOR(9)


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