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| Rev | Author | Line No. | Line |
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| 4419 | trochtova | 1 | /* |
| 2 | * Copyright (c) 2006 Josef Cejka |
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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 | /** @addtogroup kbdgen |
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| 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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| 36 | #include <key_buffer.h> |
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| 37 | #include <futex.h> |
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| 38 | |||
| 39 | atomic_t keybuffer_futex = FUTEX_INITIALIZER; |
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| 40 | |||
| 41 | /** Clear key buffer. |
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| 42 | */ |
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| 43 | void keybuffer_free(keybuffer_t *keybuffer) |
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| 44 | { |
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| 45 | futex_down(&keybuffer_futex); |
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| 46 | keybuffer->head = 0; |
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| 47 | keybuffer->tail = 0; |
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| 48 | keybuffer->items = 0; |
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| 49 | futex_up(&keybuffer_futex); |
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| 50 | } |
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| 51 | |||
| 52 | /** Key buffer initialization. |
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| 53 | * |
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| 54 | */ |
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| 55 | void keybuffer_init(keybuffer_t *keybuffer) |
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| 56 | { |
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| 57 | keybuffer_free(keybuffer); |
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| 58 | } |
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| 59 | |||
| 60 | /** Get free space in buffer. |
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| 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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| 63 | * @return empty buffer space |
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| 64 | */ |
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| 65 | int keybuffer_available(keybuffer_t *keybuffer) |
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| 66 | { |
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| 67 | return KEYBUFFER_SIZE - keybuffer->items; |
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| 68 | } |
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| 69 | |||
| 70 | /** |
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| 71 | * @return nonzero, if buffer is not empty. |
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| 72 | */ |
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| 73 | int keybuffer_empty(keybuffer_t *keybuffer) |
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| 74 | { |
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| 75 | return (keybuffer->items == 0); |
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| 76 | } |
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| 77 | |||
| 78 | /** Push key event to key buffer. |
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| 79 | * |
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| 80 | * If the buffer is full, the event is ignored. |
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| 81 | * |
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| 82 | * @param keybuffer The keybuffer. |
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| 83 | * @param ev The event to push. |
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| 84 | */ |
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| 85 | void keybuffer_push(keybuffer_t *keybuffer, const kbd_event_t *ev) |
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| 86 | { |
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| 87 | futex_down(&keybuffer_futex); |
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| 88 | if (keybuffer->items < KEYBUFFER_SIZE) { |
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| 89 | keybuffer->fifo[keybuffer->tail] = *ev; |
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| 90 | keybuffer->tail = (keybuffer->tail + 1) % KEYBUFFER_SIZE; |
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| 91 | keybuffer->items++; |
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| 92 | } |
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| 93 | futex_up(&keybuffer_futex); |
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| 94 | } |
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| 95 | |||
| 96 | /** Pop event from buffer. |
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| 97 | * |
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| 98 | * @param edst Pointer to where the event should be saved. |
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| 99 | * @return Zero on empty buffer, nonzero otherwise. |
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| 100 | */ |
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| 101 | int keybuffer_pop(keybuffer_t *keybuffer, kbd_event_t *edst) |
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| 102 | { |
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| 103 | futex_down(&keybuffer_futex); |
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| 104 | if (keybuffer->items > 0) { |
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| 105 | keybuffer->items--; |
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| 106 | *edst = (keybuffer->fifo[keybuffer->head]) ; |
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| 107 | keybuffer->head = (keybuffer->head + 1) % KEYBUFFER_SIZE; |
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| 108 | futex_up(&keybuffer_futex); |
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| 109 | return 1; |
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| 110 | } |
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| 111 | futex_up(&keybuffer_futex); |
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| 112 | return 0; |
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| 113 | } |
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| 114 | |||
| 115 | /** |
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| 116 | * @} |
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| 117 | */ |