SuSE 11.3 - man page for usb_reset_configuration (suse section 9)

USB_RESET_CONFIGURAT(9) 		  USB Core APIs 		  USB_RESET_CONFIGURAT(9)

NAME
       usb_reset_configuration - lightweight device reset

SYNOPSIS
       int usb_reset_configuration(struct usb_device * dev);

ARGUMENTS
       dev
	   the device whose configuration is being reset

DESCRIPTION
       This issues a standard SET_CONFIGURATION request to the device using the current
       configuration. The effect is to reset most USB-related state in the device, including
       interface altsettings (reset to zero), endpoint halts (cleared), and endpoint state (only
       for bulk and interrupt endpoints). Other usbcore state is unchanged, including bindings of
       usb device drivers to interfaces.

       Because this affects multiple interfaces, avoid using this with composite
       (multi-interface) devices. Instead, the driver for each interface may use
       usb_set_interface on the interfaces it claims. Be careful though; some devices don't
       support the SET_INTERFACE request, and others won't reset all the interface state (notably
       endpoint state). Resetting the whole configuration would affect other drivers' interfaces.

       The caller must own the device lock.

       Returns zero on success, else a negative error code.

COPYRIGHT
Kernel Hackers Manual 2.6.		    July 2010			  USB_RESET_CONFIGURAT(9)