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# Copyright (c) 2010 Spectra Logic Corporation
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# $FreeBSD$
#

#include <sys/bus.h>

HEADER {
struct xenbus_device_ivars;
}

INTERFACE xenbusb;

/**
 * \brief Enumerate all devices of the given type on this bus.
 *
 * \param _dev  NewBus device_t for this XenBus (front/back) bus instance.
 * \param _type String indicating the device sub-tree (e.g. "vfb", "vif")
 *              to enumerate. 
 *
 * \return  On success, 0. Otherwise an errno value indicating the
 *          type of failure.
 *
 * Devices that are found should be entered into the NewBus hierarchy via
 * xenbusb_add_device().  xenbusb_add_device() ignores duplicate detects
 * and ignores duplicate devices, so it can be called unconditionally
 * for any device found in the XenStore.
 */
METHOD int enumerate_type {
	device_t _dev;
	const char *_type;
};

/**
 * \brief Determine and store the XenStore path for the other end of
 *        a split device whose local end is represented by ivars.
 *
 * If successful, the xd_otherend_path field of the child's instance
 * variables must be updated.
 *
 * \param _dev    NewBus device_t for this XenBus (front/back) bus instance.
 * \param _ivars  Instance variables from the XenBus child device for
 *                which to perform this function.
 *
 * \return  On success, 0. Otherwise an errno value indicating the
 *          type of failure.
 */
METHOD int get_otherend_node {
	device_t _dev;
	struct xenbus_device_ivars *_ivars;
}