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510 jermar 1
/*
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 * Copyright (C) 2005 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <console/chardev.h>
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#include <putchar.h>
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#include <synch/waitq.h>
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#include <synch/spinlock.h>
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/** Initialize character device.
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 *
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 * @param chardev Character device.
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 * @param op Implementation of character device operations.
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 */
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void chardev_initialize(chardev_t *chardev, chardev_operations_t *op)
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{
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    waitq_initialize(&chardev->wq);
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    spinlock_initialize(&chardev->lock, "chardev");
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    chardev->counter = 0;
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    chardev->index = 0;
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    chardev->op = op;
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}
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/** Push character read from input character device.
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 *
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 * @param chardev Character device.
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 * @param ch Character being pushed.
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 */
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void chardev_push_character(chardev_t *chardev, __u8 ch)
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{
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        spinlock_lock(&chardev->lock);
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    chardev->counter++;
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    if (chardev->counter == CHARDEV_BUFLEN - 1) {
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        /* buffer full => disable device interrupt */
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        chardev->op->suspend();
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    }
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    putchar(ch);
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        chardev->buffer[chardev->index++] = ch;
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        chardev->index = chardev->index % CHARDEV_BUFLEN; /* index modulo size of buffer */
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        waitq_wakeup(&chardev->wq, WAKEUP_FIRST);
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        spinlock_unlock(&chardev->lock);
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}