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