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  1. /*
  2.  * Copyright (C) 2005 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #ifndef __CHARDEV_H__
  30. #define __CHARDEV_H__
  31.  
  32. #include <typedefs.h>
  33. #include <arch/types.h>
  34. #include <synch/waitq.h>
  35. #include <synch/spinlock.h>
  36.  
  37. #define CHARDEV_BUFLEN 512
  38.  
  39. /* Character device operations interface. */
  40. struct chardev_operations {
  41.     void (* suspend)(chardev_t *);      /**< Suspend pushing characters. */
  42.     void (* resume)(chardev_t *);       /**< Resume pushing characters. */
  43.     void (* write)(chardev_t *, char c);    /**< Write character to stream. */
  44.     /** Read character directly from device, assume interrupts disabled */
  45.     char (* read)(chardev_t *);
  46. };
  47.  
  48. typedef struct chardev_operations chardev_operations_t;
  49.  
  50. /** Character input device. */
  51. struct chardev {
  52.     char *name;
  53.    
  54.     waitq_t wq;
  55.     SPINLOCK_DECLARE(lock);     /**< Protects everything below. */
  56.     __u8 buffer[CHARDEV_BUFLEN];
  57.     count_t counter;
  58.     chardev_operations_t *op;   /**< Implementation of chardev operations. */
  59.     index_t index;
  60.     void *data;
  61. };
  62.  
  63. extern void chardev_initialize(char *name,
  64.                    chardev_t *chardev,
  65.                    chardev_operations_t *op);
  66. extern void chardev_push_character(chardev_t *chardev, __u8 ch);
  67.  
  68. #endif /* __CHARDEV_H__ */
  69.