text: #ifndef __ALT_DEV_H__
  #define __ALT_DEV_H__
  
  /******************************************************************************
  *                                                                             *
  * 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.          *
  ******************************************************************************/
  
  /******************************************************************************
  *                                                                             *
  * THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT.                       *
  *                                                                             *
  ******************************************************************************/
  
  #include "system.h"
  #include "sys/alt_llist.h"
  #include "priv/alt_dev_llist.h"
  
  #ifdef __cplusplus
  extern "C"
  {
  #endif /* __cplusplus */
  
  /*
   * The value ALT_IRQ_NOT_CONNECTED is used to represent an unconnected 
   * interrupt line. It cannot evaluate to a valid interrupt number.
   */
  
  #define ALT_IRQ_NOT_CONNECTED (-1)
  
  typedef struct alt_dev_s alt_dev;
  
  struct stat;
  
  /*
   * The file descriptor structure definition.
   */
  
  typedef struct alt_fd_s
  {
    alt_dev* dev;
    alt_u8*  priv;
    int      fd_flags;
  } alt_fd;
  
  /* 
   * The device structure definition. 
   */
   
  struct alt_dev_s {
    alt_llist    llist;     /* for internal use */
    const char*  name; 
    int (*open)  (alt_fd* fd, const char* name, int flags, int mode);
    int (*close) (alt_fd* fd);
    int (*read)  (alt_fd* fd, char* ptr, int len);
    int (*write) (alt_fd* fd, const char* ptr, int len); 
    int (*lseek) (alt_fd* fd, int ptr, int dir);
    int (*fstat) (alt_fd* fd, struct stat* buf);
    int (*ioctl) (alt_fd* fd, int req, void* arg);
  };
  
  /*
   * Functions used to register device for access through the C standard 
   * library.
   *
   * The only difference between alt_dev_reg() and alt_fs_reg() is the 
   * interpretation that open() places on the device name. In the case of
   * alt_dev_reg the device is assumed to be a particular character device,
   * and so there must be an exact match in the name for open to succeed. 
   * In the case of alt_fs_reg() the name of the device is treated as the
   * mount point for a directory, and so any call to open() where the name 
   * is the root of the device filename will succeed. 
   */
  
  extern int alt_fs_reg  (alt_dev* dev); 
  
  static ALT_INLINE int alt_dev_reg (alt_dev* dev)
  {
    extern alt_llist alt_dev_list;
  
    return alt_dev_llist_insert ((alt_dev_llist*) dev, &alt_dev_list);
  }
  
  #ifdef __cplusplus
  }
  #endif
   
  #endif /* __ALT_DEV_H__ */
  