/**
 * @file
 *
 * @ingroup rtems_ramdisk
 *
 * @brief RAM disk block device implementation.
 */

/*
 * Copyright (c) 2009-2012 embedded brains GmbH.  All rights reserved.
 *
 *  embedded brains GmbH
 *  Obere Lagerstr. 30
 *  82178 Puchheim
 *  Germany
 *  <rtems@embedded-brains.de>
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://www.rtems.org/license/LICENSE.
 */

#ifdef HAVE_CONFIG_H
  #include "config.h"
#endif

#include <rtems.h>
#include <rtems/ramdisk.h>

const rtems_driver_address_table ramdisk_ops = {
  .initialization_entry = NULL,
  RTEMS_GENERIC_BLOCK_DEVICE_DRIVER_ENTRIES
};

rtems_status_code ramdisk_register(
  uint32_t media_block_size,
  rtems_blkdev_bnum media_block_count,
  bool trace,
  const char *disk,
  dev_t *dev_ptr
)
{
  rtems_status_code sc = RTEMS_SUCCESSFUL;
  rtems_device_major_number major = 0;
  ramdisk *rd = NULL;
  dev_t dev = 0;

  sc = rtems_io_register_driver(0, &ramdisk_ops, &major);
  if (sc != RTEMS_SUCCESSFUL) {
    return RTEMS_UNSATISFIED;
  }

  rd = ramdisk_allocate(NULL, media_block_size, media_block_count, trace);
  if (rd == NULL) {
    rtems_io_unregister_driver(major);

    return RTEMS_UNSATISFIED;
  }

  dev = rtems_filesystem_make_dev_t(major, 0);

  sc = rtems_disk_create_phys(
    dev,
    media_block_size,
    media_block_count,
    ramdisk_ioctl,
    rd,
    disk
  );
  if (sc != RTEMS_SUCCESSFUL) {
    ramdisk_free(rd);
    rtems_io_unregister_driver(major);

    return RTEMS_UNSATISFIED;
  }

  *dev_ptr = dev;

  return RTEMS_SUCCESSFUL;
}