rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 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 | #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 | |
| 41 | struct 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 | |
| 54 | void gpio_keypad_init(struct gpio_keypad_info *kpinfo); |
| 55 | |
| 56 | #endif /* __DEV_GPIO_KEYPAD_H */ |