/*
   *  DIO Driver Services
   *
   *  Copyright (C) 2004 Jochen Friedrich
   *
   *  Loosely based on drivers/pci/pci-driver.c and drivers/zorro/zorro-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/dio.h>

  /**
   *  dio_match_device - Tell if a DIO device structure has a matching DIO device id structure
   *  @ids: array of DIO device id structures to search in
   *  @d: the DIO device structure to match against
   *
   *  Used by a driver to check whether a DIO device present in the
   *  system is in its list of supported devices. Returns the matching
   *  dio_device_id structure or %NULL if there is no match.
   */

  
  const struct dio_device_id *
  dio_match_device(const struct dio_device_id *ids,
  		   const struct dio_dev *d)
  {
  	while (ids->id) {
  		if (ids->id == DIO_WILDCARD)
  			return ids;
  		if (DIO_NEEDSSECID(ids->id & 0xff)) {
  			if (ids->id == d->id)
  				return ids;
  		} else {
  			if ((ids->id & 0xff) == (d->id & 0xff))
  				return ids;
  		}
  		ids++;
  	}
  	return NULL;
  }
  
  static int dio_device_probe(struct device *dev)
  {
  	int error = 0;
  	struct dio_driver *drv = to_dio_driver(dev->driver);
  	struct dio_dev *d = to_dio_dev(dev);
  
  	if (!d->driver && drv->probe) {
  		const struct dio_device_id *id;
  
  		id = dio_match_device(drv->id_table, d);
  		if (id)
  			error = drv->probe(d, id);
  		if (error >= 0) {
  			d->driver = drv;
  			error = 0;
  		}
  	}
  	return error;
  }

  /**
   *  dio_register_driver - register a new DIO 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 dio_register_driver(struct dio_driver *drv)
  {

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

  
  	/* register with core */

  	return driver_register(&drv->driver);

  }

  /**
   *  dio_unregister_driver - unregister a DIO driver
   *  @drv: the driver structure to unregister
   *
   *  Deletes the driver structure from the list of registered DIO 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 dio_unregister_driver(struct dio_driver *drv)
  {
  	driver_unregister(&drv->driver);
  }

  /**
   *  dio_bus_match - Tell if a DIO device structure has a matching DIO device id structure
   *  @dev: the DIO device structure to match against
   *  @drv: the &device_driver that points to the array of DIO device id structures to search
   *
   *  Used by a driver to check whether a DIO device present in the
   *  system is in its list of supported devices. Returns the matching
   *  dio_device_id structure or %NULL if there is no match.
   */

  
  static int dio_bus_match(struct device *dev, struct device_driver *drv)
  {
  	struct dio_dev *d = to_dio_dev(dev);
  	struct dio_driver *dio_drv = to_dio_driver(drv);
  	const struct dio_device_id *ids = dio_drv->id_table;
  
  	if (!ids)
  		return 0;

  	return dio_match_device(ids, d) ? 1 : 0;

  }
  
  
  struct bus_type dio_bus_type = {
  	.name	= "dio",

  	.match	= dio_bus_match,
  	.probe	= dio_device_probe,

  };
  
  
  static int __init dio_driver_init(void)
  {
  	return bus_register(&dio_bus_type);
  }
  
  postcore_initcall(dio_driver_init);
  
  EXPORT_SYMBOL(dio_match_device);
  EXPORT_SYMBOL(dio_register_driver);
  EXPORT_SYMBOL(dio_unregister_driver);

  EXPORT_SYMBOL(dio_bus_type);