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 */ 57