1 /*- 2 * Copyright (c) 2013-2014 Rui Paulo <rpaulo@FreeBSD.org> 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 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 17 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 18 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 20 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 22 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 23 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 24 * POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #ifndef _LIBGPIO_H_ 28 #define _LIBGPIO_H_ 29 30 #include <sys/gpio.h> 31 32 __BEGIN_DECLS 33 34 #define GPIO_INVALID_HANDLE -1 35 typedef int gpio_handle_t; 36 typedef uint32_t gpio_pin_t; 37 38 /* 39 * Structure describing a GPIO pin configuration. 40 */ 41 typedef struct { 42 gpio_pin_t g_pin; 43 char g_name[GPIOMAXNAME]; 44 uint32_t g_caps; 45 uint32_t g_flags; 46 } gpio_config_t; 47 48 typedef enum { 49 GPIO_VALUE_INVALID = -1, 50 GPIO_VALUE_LOW = GPIO_PIN_LOW, 51 GPIO_VALUE_HIGH = GPIO_PIN_HIGH 52 } gpio_value_t; 53 54 /* 55 * Open /dev/gpiocN or a specific device. 56 */ 57 gpio_handle_t gpio_open(unsigned int); 58 gpio_handle_t gpio_open_device(const char *); 59 void gpio_close(gpio_handle_t); 60 /* 61 * Get a list of all the GPIO pins. 62 */ 63 int gpio_pin_list(gpio_handle_t, gpio_config_t **); 64 /* 65 * GPIO pin configuration. 66 * 67 * Retrieve the configuration of a specific GPIO pin. The pin number is 68 * passed through the gpio_config_t structure. 69 */ 70 int gpio_pin_config(gpio_handle_t, gpio_config_t *); 71 /* 72 * Sets the GPIO pin name. The pin number and pin name to be set are passed 73 * as parameters. 74 */ 75 int gpio_pin_set_name(gpio_handle_t, gpio_pin_t, char *); 76 /* 77 * Sets the GPIO flags on a specific GPIO pin. The pin number and the flags 78 * to be set are passed through the gpio_config_t structure. 79 */ 80 int gpio_pin_set_flags(gpio_handle_t, gpio_config_t *); 81 /* 82 * GPIO pin values. 83 */ 84 gpio_value_t gpio_pin_get(gpio_handle_t, gpio_pin_t); 85 int gpio_pin_set(gpio_handle_t, gpio_pin_t, gpio_value_t); 86 int gpio_pin_toggle(gpio_handle_t, gpio_pin_t); 87 /* 88 * Helper functions to set pin states. 89 */ 90 int gpio_pin_low(gpio_handle_t, gpio_pin_t); 91 int gpio_pin_high(gpio_handle_t, gpio_pin_t); 92 /* 93 * Helper functions to configure pins. 94 */ 95 int gpio_pin_input(gpio_handle_t, gpio_pin_t); 96 int gpio_pin_output(gpio_handle_t, gpio_pin_t); 97 int gpio_pin_opendrain(gpio_handle_t, gpio_pin_t); 98 int gpio_pin_pushpull(gpio_handle_t, gpio_pin_t); 99 int gpio_pin_tristate(gpio_handle_t, gpio_pin_t); 100 int gpio_pin_pullup(gpio_handle_t, gpio_pin_t); 101 int gpio_pin_pulldown(gpio_handle_t, gpio_pin_t); 102 int gpio_pin_invin(gpio_handle_t, gpio_pin_t); 103 int gpio_pin_invout(gpio_handle_t, gpio_pin_t); 104 int gpio_pin_pulsate(gpio_handle_t, gpio_pin_t); 105 106 __END_DECLS 107 108 #endif /* _LIBGPIO_H_ */ 109