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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. /** @addtogroup genericconsole
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <console/chardev.h>
  36. #include <putchar.h>
  37. #include <synch/waitq.h>
  38. #include <synch/spinlock.h>
  39.  
  40. /** Initialize input character device.
  41.  *
  42.  * @param indev Input character device.
  43.  * @param op    Implementation of input character device operations.
  44.  *
  45.  */
  46. void indev_initialize(char *name, indev_t *indev,
  47.     indev_operations_t *op)
  48. {
  49.     indev->name = name;
  50.     waitq_initialize(&indev->wq);
  51.     spinlock_initialize(&indev->lock, "indev");
  52.     indev->counter = 0;
  53.     indev->index = 0;
  54.     indev->op = op;
  55. }
  56.  
  57. /** Push character read from input character device.
  58.  *
  59.  * @param indev Input character device.
  60.  * @param ch    Character being pushed.
  61.  *
  62.  */
  63. void indev_push_character(indev_t *indev, uint8_t ch)
  64. {
  65.     ASSERT(indev);
  66.    
  67.     spinlock_lock(&indev->lock);
  68.     if (indev->counter == INDEV_BUFLEN - 1) {
  69.         /* Buffer full */
  70.         spinlock_unlock(&indev->lock);
  71.         return;
  72.     }
  73.    
  74.     indev->counter++;
  75.     indev->buffer[indev->index++] = ch;
  76.    
  77.     /* Index modulo size of buffer */
  78.     indev->index = indev->index % INDEV_BUFLEN;
  79.     waitq_wakeup(&indev->wq, WAKEUP_FIRST);
  80.     spinlock_unlock(&indev->lock);
  81. }
  82.  
  83. /** Initialize output character device.
  84.  *
  85.  * @param outdev Output character device.
  86.  * @param op     Implementation of output character device operations.
  87.  *
  88.  */
  89. void outdev_initialize(char *name, outdev_t *outdev,
  90.     outdev_operations_t *op)
  91. {
  92.     outdev->name = name;
  93.     spinlock_initialize(&outdev->lock, "outdev");
  94.     outdev->op = op;
  95. }
  96.  
  97. /** @}
  98.  */
  99.