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| Rev | Author | Line No. | Line |
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| 510 | jermar | 1 | /* |
| 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 | |||
| 29 | #include <console/chardev.h> |
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| 511 | jermar | 30 | #include <putchar.h> |
| 510 | jermar | 31 | #include <synch/waitq.h> |
| 32 | #include <synch/spinlock.h> |
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| 33 | |||
| 511 | jermar | 34 | /** Initialize character device. |
| 35 | * |
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| 36 | * @param chardev Character device. |
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| 37 | * @param op Implementation of character device operations. |
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| 38 | */ |
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| 39 | void chardev_initialize(chardev_t *chardev, chardev_operations_t *op) |
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| 510 | jermar | 40 | { |
| 41 | waitq_initialize(&chardev->wq); |
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| 42 | spinlock_initialize(&chardev->lock); |
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| 43 | chardev->counter = 0; |
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| 44 | chardev->index = 0; |
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| 511 | jermar | 45 | chardev->op = op; |
| 510 | jermar | 46 | } |
| 511 | jermar | 47 | |
| 48 | /** Push character read from input character device. |
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| 49 | * |
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| 50 | * @param chardev Character device. |
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| 51 | * @param ch Character being pushed. |
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| 52 | */ |
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| 53 | void chardev_push_character(chardev_t *chardev, __u8 ch) |
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| 54 | { |
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| 55 | spinlock_lock(&chardev->lock); |
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| 56 | chardev->counter++; |
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| 57 | if (chardev->counter == CHARDEV_BUFLEN - 1) { |
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| 58 | /* buffer full => disable device interrupt */ |
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| 59 | chardev->op->suspend(); |
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| 60 | } |
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| 61 | |||
| 62 | putchar(ch); |
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| 63 | chardev->buffer[chardev->index++] = ch; |
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| 64 | chardev->index = chardev->index % CHARDEV_BUFLEN; /* index modulo size of buffer */ |
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| 65 | waitq_wakeup(&chardev->wq, WAKEUP_FIRST); |
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| 66 | spinlock_unlock(&chardev->lock); |
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| 67 | } |