| 1 | /*
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| 2 | * Copyright (C) 2005 Jakub Jermar
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup genericconsole Console
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| 30 | * @ingroup kernel
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| 31 | * @{
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| 32 | */
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| 33 | /** @file
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| 34 | */
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| 35 |
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| 36 | #include <console/chardev.h>
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| 37 | #include <putchar.h>
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| 38 | #include <synch/waitq.h>
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| 39 | #include <synch/spinlock.h>
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| 40 |
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| 41 | /** Initialize character device.
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| 42 | *
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| 43 | * @param chardev Character device.
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| 44 | * @param op Implementation of character device operations.
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| 45 | */
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| 46 | void chardev_initialize(char *name,chardev_t *chardev,
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| 47 | chardev_operations_t *op)
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| 48 | {
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| 49 | chardev->name = name;
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| 50 |
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| 51 | waitq_initialize(&chardev->wq);
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| 52 | spinlock_initialize(&chardev->lock, "chardev");
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| 53 | chardev->counter = 0;
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| 54 | chardev->index = 0;
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| 55 | chardev->op = op;
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| 56 | }
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| 57 |
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| 58 | /** Push character read from input character device.
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| 59 | *
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| 60 | * @param chardev Character device.
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| 61 | * @param ch Character being pushed.
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| 62 | */
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| 63 | void chardev_push_character(chardev_t *chardev, __u8 ch)
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| 64 | {
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| 65 | spinlock_lock(&chardev->lock);
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| 66 | chardev->counter++;
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| 67 | if (chardev->counter == CHARDEV_BUFLEN - 1) {
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| 68 | /* buffer full => disable device interrupt */
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| 69 | chardev->op->suspend(chardev);
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| 70 | }
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| 71 |
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| 72 | chardev->buffer[chardev->index++] = ch;
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| 73 | chardev->index = chardev->index % CHARDEV_BUFLEN; /* index modulo size of buffer */
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| 74 | waitq_wakeup(&chardev->wq, WAKEUP_FIRST);
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| 75 | spinlock_unlock(&chardev->lock);
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| 76 | }
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| 77 |
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| 78 | /** @}
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| 79 | */
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| 80 |
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