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dio-driver.c

/*
 *  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
       *  @dev: 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
       *  @ids: array of DIO device id structures to search in
       *  @dev: 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.
       */

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;

      while (ids->id) {
            if (ids->id == DIO_WILDCARD)
                  return 1;
            if (DIO_NEEDSSECID(ids->id & 0xff)) {
                  if (ids->id == d->id)
                        return 1;
            } else {
                  if ((ids->id & 0xff) == (d->id & 0xff))
                        return 1;
            }
            ids++;
      }
      return 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_dev_driver);
EXPORT_SYMBOL(dio_bus_type);

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