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