1 /* 2 * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * Redistributions of source code must retain the above copyright notice, this 8 * list of conditions and the following disclaimer. 9 * 10 * Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 14 * Neither the name of ARM nor the names of its contributors may be used 15 * to endorse or promote products derived from this software without specific 16 * prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef __GPIO_H__ 32 #define __GPIO_H__ 33 34 #define GPIO_DIR_OUT 0 35 #define GPIO_DIR_IN 1 36 37 #define GPIO_LEVEL_LOW 0 38 #define GPIO_LEVEL_HIGH 1 39 40 #define GPIO_PULL_NONE 0 41 #define GPIO_PULL_UP 1 42 #define GPIO_PULL_DOWN 2 43 44 typedef struct gpio_ops { 45 int (*get_direction)(int gpio); 46 void (*set_direction)(int gpio, int direction); 47 int (*get_value)(int gpio); 48 void (*set_value)(int gpio, int value); 49 void (*set_pull)(int gpio, int pull); 50 int (*get_pull)(int gpio); 51 } gpio_ops_t; 52 53 int gpio_get_direction(int gpio); 54 void gpio_set_direction(int gpio, int direction); 55 int gpio_get_value(int gpio); 56 void gpio_set_value(int gpio, int value); 57 void gpio_set_pull(int gpio, int pull); 58 int gpio_get_pull(int gpio); 59 void gpio_init(const gpio_ops_t *ops); 60 61 #endif /* __GPIO_H__ */ 62