linux/drivers/xen/xenbus/xenbus_probe.h

/******************************************************************************
 * xenbus_probe.h
 *
 * Talks to Xen Store to figure out what devices we have.
 *
 * Copyright (C) 2005 Rusty Russell, IBM Corporation
 * Copyright (C) 2005 XenSource Ltd.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation; or, when distributed
 * separately from the Linux kernel or incorporated into other
 * software packages, subject to the following license:
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this source file (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy, modify,
 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#ifndef _XENBUS_PROBE_H
#define _XENBUS_PROBE_H

#define XEN_BUS_ID_SIZE			20

#ifdef CONFIG_XEN_BACKEND
extern void xenbus_backend_suspend(int (*fn)(struct device *, void *));
extern void xenbus_backend_resume(int (*fn)(struct device *, void *));
extern void xenbus_backend_probe_and_watch(void);
extern int xenbus_backend_bus_register(void);
extern void xenbus_backend_bus_unregister(void);
#else
static inline void xenbus_backend_suspend(int (*fn)(struct device *, void *)) {}
static inline void xenbus_backend_resume(int (*fn)(struct device *, void *)) {}
static inline void xenbus_backend_probe_and_watch(void) {}
static inline int xenbus_backend_bus_register(void) { return 0; }
static inline void xenbus_backend_bus_unregister(void) {}
#endif

struct xen_bus_type
{
	char *root;
	unsigned int levels;
	int (*get_bus_id)(char bus_id[XEN_BUS_ID_SIZE], const char *nodename);
	int (*probe)(const char *type, const char *dir);
	struct bus_type bus;
};

extern int xenbus_match(struct device *_dev, struct device_driver *_drv);
extern int xenbus_dev_probe(struct device *_dev);
extern int xenbus_dev_remove(struct device *_dev);
extern int xenbus_register_driver_common(struct xenbus_driver *drv,
					 struct xen_bus_type *bus,
					 struct module *owner,
					 const char *mod_name);
extern int xenbus_probe_node(struct xen_bus_type *bus,
			     const char *type,
			     const char *nodename);
extern int xenbus_probe_devices(struct xen_bus_type *bus);

extern void xenbus_dev_changed(const char *node, struct xen_bus_type *bus);

#endif