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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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575 | palkovsky | 39 | void chardev_initialize(char *name,chardev_t *chardev, |
40 | chardev_operations_t *op) |
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510 | jermar | 41 | { |
575 | palkovsky | 42 | chardev->name = name; |
43 | |||
510 | jermar | 44 | waitq_initialize(&chardev->wq); |
552 | palkovsky | 45 | spinlock_initialize(&chardev->lock, "chardev"); |
510 | jermar | 46 | chardev->counter = 0; |
47 | chardev->index = 0; |
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511 | jermar | 48 | chardev->op = op; |
510 | jermar | 49 | } |
511 | jermar | 50 | |
51 | /** Push character read from input character device. |
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52 | * |
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53 | * @param chardev Character device. |
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54 | * @param ch Character being pushed. |
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55 | */ |
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56 | void chardev_push_character(chardev_t *chardev, __u8 ch) |
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57 | { |
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990 | decky | 58 | spinlock_lock(&chardev->lock); |
511 | jermar | 59 | chardev->counter++; |
60 | if (chardev->counter == CHARDEV_BUFLEN - 1) { |
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61 | /* buffer full => disable device interrupt */ |
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575 | palkovsky | 62 | chardev->op->suspend(chardev); |
511 | jermar | 63 | } |
990 | decky | 64 | |
65 | chardev->buffer[chardev->index++] = ch; |
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66 | chardev->index = chardev->index % CHARDEV_BUFLEN; /* index modulo size of buffer */ |
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67 | waitq_wakeup(&chardev->wq, WAKEUP_FIRST); |
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68 | spinlock_unlock(&chardev->lock); |
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511 | jermar | 69 | } |