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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 Console
  30.  * @ingroup kernel
  31.  * @{
  32.  */
  33. /** @file
  34.  */
  35.  
  36. #include <console/chardev.h>
  37. #include <putchar.h>
  38. #include <synch/waitq.h>
  39. #include <synch/spinlock.h>
  40.  
  41. /** Initialize character device.
  42.  *
  43.  * @param chardev Character device.
  44.  * @param op Implementation of character device operations.
  45.  */
  46. void chardev_initialize(char *name,chardev_t *chardev,
  47.             chardev_operations_t *op)
  48. {
  49.     chardev->name = name;
  50.  
  51.     waitq_initialize(&chardev->wq);
  52.     spinlock_initialize(&chardev->lock, "chardev");
  53.     chardev->counter = 0;
  54.     chardev->index = 0;
  55.     chardev->op = op;
  56. }
  57.  
  58. /** Push character read from input character device.
  59.  *
  60.  * @param chardev Character device.
  61.  * @param ch Character being pushed.
  62.  */
  63. void chardev_push_character(chardev_t *chardev, __u8 ch)
  64. {
  65.     spinlock_lock(&chardev->lock);
  66.     chardev->counter++;
  67.     if (chardev->counter == CHARDEV_BUFLEN - 1) {
  68.         /* buffer full => disable device interrupt */
  69.         chardev->op->suspend(chardev);
  70.     }
  71.    
  72.     chardev->buffer[chardev->index++] = ch;
  73.     chardev->index = chardev->index % CHARDEV_BUFLEN; /* index modulo size of buffer */
  74.     waitq_wakeup(&chardev->wq, WAKEUP_FIRST);
  75.     spinlock_unlock(&chardev->lock);
  76. }
  77.  
  78.  /** @}
  79.  */
  80.  
  81.