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/******************************************************************************

*                                                                             *

* License Agreement                                                           *

*                                                                             *

* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *

* All rights reserved.                                                        *

*                                                                             *

* Permission is hereby granted, free of charge, to any person obtaining a     *

* copy of this software and associated documentation files (the "Software"),  *

* to deal in the Software without restriction, including without limitation   *

* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *

* and/or sell copies of the Software, and to permit persons to whom the       *

* Software is furnished to do so, subject to the following conditions:        *

*                                                                             *

* The above copyright notice and this permission notice shall be included in  *

* all copies or substantial portions of the Software.                         *

*                                                                             *

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *

* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *

* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *

* DEALINGS IN THE SOFTWARE.                                                   *

*                                                                             *

* This agreement shall be governed in all respects by the laws of the State   *

* of California and by the laws of the United States of America.              *

*                                                                             *

* Altera does not recommend, suggest or require that this reference design    *

* file be used in conjunction or combination with any other product.          *

******************************************************************************/

#include <errno.h>

#include "sys/alt_dev.h"

#include "priv/alt_file.h"

/*

 * The alt_fs_reg() function is used to register a file system. Once registered

 * a device can be accessed using the standard posix calls: open(), read(),

 * write() etc.

 *

 * System behaviour is undefined in the event that a file system is registered

 * with a name that conflicts with an existing device or file system.

 *

 * alt_fs_reg() is not thread safe in the sense that there should be no other

 * thread using the file system list at the time that alt_dev_reg() is called. In

 * practice this means that alt_fs_reg() should only be called while operating

 * in a single threaded mode. The expectation is that it will only be called

 * by the file system initilisation functions invoked by alt_sys_init(), which in

 * turn should only be called by the single threaded C startup code.

 *

 * A return value of zero indicates success. A negative return value indicates

 * failure.

 */

int alt_fs_reg (alt_dev* dev)

{

  /*

   * check that the device has a name.

   */

  if (!dev->name)

  {

    return -ENODEV;

  }

  /*

   * register the file system.

   */

  alt_llist_insert(&alt_fs_list, &dev->llist);

  return 0;

}