drivers/xen/xenbus/xenbus_probe.h

   1 /******************************************************************************
   2  * xenbus_probe.h
   3  *
   4  * Talks to Xen Store to figure out what devices we have.
   5  *
   6  * Copyright (C) 2005 Rusty Russell, IBM Corporation
   7  * Copyright (C) 2005 XenSource Ltd.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License version 2
  11  * as published by the Free Software Foundation; or, when distributed
  12  * separately from the Linux kernel or incorporated into other
  13  * software packages, subject to the following license:
  14  *
  15  * Permission is hereby granted, free of charge, to any person obtaining a copy
  16  * of this source file (the "Software"), to deal in the Software without
  17  * restriction, including without limitation the rights to use, copy, modify,
  18  * merge, publish, distribute, sublicense, and/or sell copies of the Software,
  19  * and to permit persons to whom the Software is furnished to do so, subject to
  20  * the following conditions:
  21  *
  22  * The above copyright notice and this permission notice shall be included in
  23  * all copies or substantial portions of the Software.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  26  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  27  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  28  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  29  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  30  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  31  * IN THE SOFTWARE.
  32  */
  33
  34 #ifndef _XENBUS_PROBE_H
  35 #define _XENBUS_PROBE_H
  36
  37 #define XEN_BUS_ID_SIZE                 20
  38
  39 #ifdef CONFIG_XEN_BACKEND
  40 extern void xenbus_backend_suspend(int (*fn)(struct device *, void *));
  41 extern void xenbus_backend_resume(int (*fn)(struct device *, void *));
  42 extern void xenbus_backend_probe_and_watch(void);
  43 extern int xenbus_backend_bus_register(void);
  44 extern void xenbus_backend_bus_unregister(void);
  45 #else
  46 static inline void xenbus_backend_suspend(int (*fn)(struct device *, void *)) {}
  47 static inline void xenbus_backend_resume(int (*fn)(struct device *, void *)) {}
  48 static inline void xenbus_backend_probe_and_watch(void) {}
  49 static inline int xenbus_backend_bus_register(void) { return 0; }
  50 static inline void xenbus_backend_bus_unregister(void) {}
  51 #endif
  52
  53 struct xen_bus_type
  54 {
  55         char *root;
  56         unsigned int levels;
  57         int (*get_bus_id)(char bus_id[XEN_BUS_ID_SIZE], const char *nodename);
  58         int (*probe)(const char *type, const char *dir);
  59         struct bus_type bus;
  60 };
  61
  62 extern int xenbus_match(struct device *_dev, struct device_driver *_drv);
  63 extern int xenbus_dev_probe(struct device *_dev);
  64 extern int xenbus_dev_remove(struct device *_dev);
  65 extern int xenbus_register_driver_common(struct xenbus_driver *drv,
  66                                          struct xen_bus_type *bus,
  67                                          struct module *owner,
  68                                          const char *mod_name);
  69 extern int xenbus_probe_node(struct xen_bus_type *bus,
  70                              const char *type,
  71                              const char *nodename);
  72 extern int xenbus_probe_devices(struct xen_bus_type *bus);
  73
  74 extern void xenbus_dev_changed(const char *node, struct xen_bus_type *bus);
  75
  76 #endif