/*
   *  Zorro Driver Services
   *
   *  Copyright (C) 2003 Geert Uytterhoeven
   *
   *  Loosely based on drivers/pci/pci-driver.c
   *
   *  This file is subject to the terms and conditions of the GNU General Public
   *  License.  See the file COPYING in the main directory of this archive
   *  for more details.
   */
  
  #include <linux/init.h>
  #include <linux/module.h>
  #include <linux/zorro.h>
  
  
      /**
       *  zorro_match_device - Tell if a Zorro device structure has a matching
       *                       Zorro device id structure
       *  @ids: array of Zorro device id structures to search in
       *  @dev: the Zorro device structure to match against
       *
       *  Used by a driver to check whether a Zorro device present in the
       *  system is in its list of supported devices. Returns the matching
       *  zorro_device_id structure or %NULL if there is no match.
       */
  
  const struct zorro_device_id *
  zorro_match_device(const struct zorro_device_id *ids,
  		   const struct zorro_dev *z)
  {
  	while (ids->id) {
  		if (ids->id == ZORRO_WILDCARD || ids->id == z->id)
  			return ids;
  		ids++;
  	}
  	return NULL;
  }
  
  
  static int zorro_device_probe(struct device *dev)
  {
  	int error = 0;
  	struct zorro_driver *drv = to_zorro_driver(dev->driver);
  	struct zorro_dev *z = to_zorro_dev(dev);
  
  	if (!z->driver && drv->probe) {
  		const struct zorro_device_id *id;
  
  		id = zorro_match_device(drv->id_table, z);
  		if (id)
  			error = drv->probe(z, id);
  		if (error >= 0) {
  			z->driver = drv;
  			error = 0;
  		}
  	}
  	return error;
  }

  static int zorro_device_remove(struct device *dev)
  {
  	struct zorro_dev *z = to_zorro_dev(dev);
  	struct zorro_driver *drv = to_zorro_driver(dev->driver);
  
  	if (drv) {
  		if (drv->remove)
  			drv->remove(z);
  		z->driver = NULL;
  	}
  	return 0;
  }

      /**
       *  zorro_register_driver - register a new Zorro driver
       *  @drv: the driver structure to register
       *
       *  Adds the driver structure to the list of registered drivers

       *  Returns zero or a negative error value.

       */
  
  int zorro_register_driver(struct zorro_driver *drv)
  {

  	/* initialize common driver fields */
  	drv->driver.name = drv->name;
  	drv->driver.bus = &zorro_bus_type;

  
  	/* register with core */

  	return driver_register(&drv->driver);

  }
  
  
      /**
       *  zorro_unregister_driver - unregister a zorro driver
       *  @drv: the driver structure to unregister
       *
       *  Deletes the driver structure from the list of registered Zorro drivers,
       *  gives it a chance to clean up by calling its remove() function for
       *  each device it was responsible for, and marks those devices as
       *  driverless.
       */
  
  void zorro_unregister_driver(struct zorro_driver *drv)
  {
  	driver_unregister(&drv->driver);
  }
  
  
      /**
       *  zorro_bus_match - Tell if a Zorro device structure has a matching Zorro
       *                    device id structure
       *  @ids: array of Zorro device id structures to search in
       *  @dev: the Zorro device structure to match against
       *
       *  Used by a driver to check whether a Zorro device present in the
       *  system is in its list of supported devices.Returns the matching
       *  zorro_device_id structure or %NULL if there is no match.
       */
  
  static int zorro_bus_match(struct device *dev, struct device_driver *drv)
  {
  	struct zorro_dev *z = to_zorro_dev(dev);
  	struct zorro_driver *zorro_drv = to_zorro_driver(drv);
  	const struct zorro_device_id *ids = zorro_drv->id_table;
  
  	if (!ids)
  		return 0;
  
  	while (ids->id) {
  		if (ids->id == ZORRO_WILDCARD || ids->id == z->id)
  			return 1;
  		ids++;
  	}
  	return 0;
  }
  
  
  struct bus_type zorro_bus_type = {
  	.name	= "zorro",

  	.match	= zorro_bus_match,
  	.probe	= zorro_device_probe,

  	.remove	= zorro_device_remove,

  };
  
  
  static int __init zorro_driver_init(void)
  {
  	return bus_register(&zorro_bus_type);
  }
  
  postcore_initcall(zorro_driver_init);
  
  EXPORT_SYMBOL(zorro_match_device);
  EXPORT_SYMBOL(zorro_register_driver);
  EXPORT_SYMBOL(zorro_unregister_driver);
  EXPORT_SYMBOL(zorro_dev_driver);
  EXPORT_SYMBOL(zorro_bus_type);