Man page or keyword search:   man All Sections 1 - General Commands 2 - System Calls 3 - Subroutines, Functions 4 - Special Files 5 - File Formats 6 - Games and Screensavers 7 - Macros and Conventions 8 - Maintenence Commands 9 - Kernel Interface New Commands Server 4.4BSD AIX Alpinelinux Archlinux Aros BSDOS BSDi Bifrost CentOS Cygwin Darwin Debian DigitalUNIX DragonFly ElementaryOS Fedora FreeBSD Gentoo GhostBSD HP-UX Haiku Hurd IRIX Inferno JazzOS Kali Knoppix LinuxMint MacOSX Mageia Mandriva Manjaro Minix MirBSD NeXTSTEP NetBSD OPENSTEP OSF1 OpenBSD OpenDarwin OpenIndiana OpenMandriva OpenServer OpenSuSE OpenVMS Oracle PC-BSD Peanut Pidora Plan9 QNX Raspbian RedHat Scientific Slackware SmartOS Solaris SuSE SunOS Syllable Tru64 UNIXv7 Ubuntu Ultrix UnixWare Xenix YellowDog aLinux   26626 pages apropos Keyword Search (all sections) Output format html ascii pdf view pdf save postscript

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.

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

COPYRIGHT
Kernel Hackers Manual 2.6.	 November 2013		 USB_GET_DESCRIPTOR(9)

Vote for polarhome