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1339 | cejka | 1 | /* |
2071 | jermar | 2 | * Copyright (c) 2006 Josef Cejka |
1339 | cejka | 3 | * All rights reserved. |
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 | |||
1649 | cejka | 29 | /** @addtogroup kbdgen |
30 | * @brief HelenOS generic uspace keyboard handler. |
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31 | * @ingroup kbd |
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32 | * @{ |
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33 | */ |
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34 | /** @file |
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35 | */ |
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1339 | cejka | 36 | #include <key_buffer.h> |
1476 | cejka | 37 | #include <futex.h> |
1339 | cejka | 38 | |
1476 | cejka | 39 | atomic_t keybuffer_futex = FUTEX_INITIALIZER; |
40 | |||
1344 | cejka | 41 | /** Clear key buffer. |
42 | */ |
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1451 | cejka | 43 | void keybuffer_free(keybuffer_t *keybuffer) |
1339 | cejka | 44 | { |
1476 | cejka | 45 | futex_down(&keybuffer_futex); |
46 | keybuffer->head = 0; |
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47 | keybuffer->tail = 0; |
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1451 | cejka | 48 | keybuffer->items = 0; |
1476 | cejka | 49 | futex_up(&keybuffer_futex); |
1339 | cejka | 50 | } |
51 | |||
1344 | cejka | 52 | /** Key buffer initialization. |
53 | * |
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54 | */ |
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1451 | cejka | 55 | void keybuffer_init(keybuffer_t *keybuffer) |
1339 | cejka | 56 | { |
1451 | cejka | 57 | keybuffer_free(keybuffer); |
1339 | cejka | 58 | } |
59 | |||
1344 | cejka | 60 | /** Get free space in buffer. |
61 | * This function is useful for processing some scancodes that are translated |
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62 | * to more than one character. |
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1339 | cejka | 63 | * @return empty buffer space |
64 | */ |
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1451 | cejka | 65 | int keybuffer_available(keybuffer_t *keybuffer) |
1339 | cejka | 66 | { |
1451 | cejka | 67 | return KEYBUFFER_SIZE - keybuffer->items; |
1339 | cejka | 68 | } |
69 | |||
1344 | cejka | 70 | /** |
71 | * @return nonzero, if buffer is not empty. |
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72 | */ |
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1451 | cejka | 73 | int keybuffer_empty(keybuffer_t *keybuffer) |
1344 | cejka | 74 | { |
1451 | cejka | 75 | return (keybuffer->items == 0); |
1344 | cejka | 76 | } |
77 | |||
78 | /** Push key to key buffer. |
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79 | * If buffer is full, character is ignored. |
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80 | * @param key code of stored key |
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81 | */ |
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1560 | vana | 82 | void keybuffer_push(keybuffer_t *keybuffer, int key) |
1339 | cejka | 83 | { |
1476 | cejka | 84 | futex_down(&keybuffer_futex); |
1451 | cejka | 85 | if (keybuffer->items < KEYBUFFER_SIZE) { |
1476 | cejka | 86 | keybuffer->fifo[keybuffer->tail] = key; |
87 | keybuffer->tail = (keybuffer->tail + 1) % KEYBUFFER_SIZE; |
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1451 | cejka | 88 | keybuffer->items++; |
1339 | cejka | 89 | } |
1476 | cejka | 90 | futex_up(&keybuffer_futex); |
1339 | cejka | 91 | } |
92 | |||
93 | /** Pop character from buffer. |
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1344 | cejka | 94 | * @param c pointer to space where to store character from buffer. |
1339 | cejka | 95 | * @return zero on empty buffer, nonzero else |
96 | */ |
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1560 | vana | 97 | int keybuffer_pop(keybuffer_t *keybuffer, int *c) |
1339 | cejka | 98 | { |
1476 | cejka | 99 | futex_down(&keybuffer_futex); |
1451 | cejka | 100 | if (keybuffer->items > 0) { |
101 | keybuffer->items--; |
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1560 | vana | 102 | *c = (keybuffer->fifo[keybuffer->head]) ; |
1476 | cejka | 103 | keybuffer->head = (keybuffer->head + 1) % KEYBUFFER_SIZE; |
104 | futex_up(&keybuffer_futex); |
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1339 | cejka | 105 | return 1; |
106 | } |
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1476 | cejka | 107 | futex_up(&keybuffer_futex); |
1339 | cejka | 108 | return 0; |
109 | } |
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110 | |||
1649 | cejka | 111 | /** |
112 | * @} |
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113 | */ |
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1339 | cejka | 114 |