blob: 445e65a97b08bbc5c64aaf3f90b45989c77bc235 [file] [log] [blame]
rjw1f884582022-01-06 17:20:42 +08001/*
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#ifndef __DEV_GPIO_KEYPAD_H
33#define __DEV_GPIO_KEYPAD_H
34
35#include <sys/types.h>
36
37/* unset: drive active output low, set: drive active output high */
38#define GPIOKPF_ACTIVE_HIGH (1U << 0)
39#define GPIOKPF_DRIVE_INACTIVE (1U << 1)
40
41struct gpio_keypad_info {
42 /* size must be ninputs * noutputs */
43 const uint16_t *keymap;
44 unsigned *input_gpios;
45 unsigned *output_gpios;
46 int ninputs;
47 int noutputs;
48 /* time to wait before reading inputs after driving each output */
49 time_t settle_time;
50 time_t poll_time;
51 unsigned flags;
52};
53
54void gpio_keypad_init(struct gpio_keypad_info *kpinfo);
55
56#endif /* __DEV_GPIO_KEYPAD_H */