1 /*
2 * Copyright (c) 2008, Google Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google, Inc. nor the names of its contributors
15 * may be used to endorse or promote products derived from this
16 * software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
22 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
25 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
27 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
28 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <lk/bits.h>
33 #include <lk/debug.h>
34 #include <string.h>
35 #include <dev/keys.h>
36
37 static unsigned long key_bitmap[BITMAP_NUM_WORDS(MAX_KEYS)];
38
keys_init(void)39 void keys_init(void) {
40 memset(key_bitmap, 0, sizeof(key_bitmap));
41 }
42
keys_post_event(uint16_t code,int16_t value)43 void keys_post_event(uint16_t code, int16_t value) {
44 if (code >= MAX_KEYS) {
45 dprintf(INFO, "Invalid keycode posted: %d\n", code);
46 return;
47 }
48
49 /* TODO: Implement an actual event queue if it becomes necessary */
50 if (value)
51 bitmap_set(key_bitmap, code);
52 else
53 bitmap_clear(key_bitmap, code);
54
55 // dprintf(INFO, "key state change: %d %d\n", code, value);
56 }
57
keys_get_state(uint16_t code)58 int keys_get_state(uint16_t code) {
59 if (code >= MAX_KEYS) {
60 dprintf(INFO, "Invalid keycode requested: %d\n", code);
61 return -1;
62 }
63 return bitmap_test(key_bitmap, code);
64 }
65