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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 | */ |