135 lines
3.2 KiB
C
135 lines
3.2 KiB
C
/*
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* Author: Thomas Ingleby <thomas.c.ingleby@intel.com>
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* Copyright (c) 2014 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <stdlib.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "gpio.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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static int
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gpio_get_valfp(gpio_t *gpio)
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{
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char bu[64];
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sprintf(bu, "/sys/class/gpio/gpio%d/value", gpio->pin);
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if((gpio->value_fp = fopen(bu, "r+b")) == NULL) {
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return 1;
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}
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return 0;
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}
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void
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gpio_init(gpio_t *gpio, int pin)
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{
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FILE *export_f;
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if((export_f = fopen("/sys/class/gpio/export", "w")) == NULL) {
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fprintf(stderr, "Failed to open export for writing!\n");
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} else {
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fprintf(export_f, "%d", pin);
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fclose(export_f);
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}
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gpio->pin = pin;
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}
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int
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gpio_set(int pin)
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{
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//Stuff
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return 0;
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}
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void
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gpio_mode(gpio_t *gpio, gpio_mode_t mode)
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{
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//gpio->pin
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}
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void
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gpio_dir(gpio_t *gpio, gpio_dir_t dir)
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{
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if(gpio->value_fp != NULL) {
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gpio->value_fp = NULL;
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}
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char filepath[64];
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snprintf(filepath, 64, "/sys/class/gpio/gpio%d/direction", gpio->pin);
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FILE *direction;
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if((direction = fopen(filepath, "w")) == NULL) {
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fprintf(stderr, "Failed to open direction for writing!\n");
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} else {
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fprintf(direction, dir);
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fclose(direction);
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gpio->value_fp = NULL;
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}
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}
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int
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gpio_read(gpio_t *gpio)
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{
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if(gpio->value_fp == NULL) {
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gpio_get_valfp(gpio);
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}
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fseek(gpio->value_fp, SEEK_SET, 0);
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char buffer[2];
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fread(buffer, 2, 1, gpio->value_fp);
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fseek(gpio->value_fp, SEEK_SET, 0);
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return atoi(buffer);
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}
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void
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gpio_write(gpio_t *gpio, int value)
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{
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if(gpio->value_fp == NULL) {
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gpio_get_valfp(gpio);
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}
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fseek(gpio->value_fp, SEEK_SET, 0);
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fprintf(gpio->value_fp, "%d", value);
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fseek(gpio->value_fp, SEEK_SET, 0);
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}
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void
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gpio_close(gpio_t *gpio)
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{
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FILE *unexport_f;
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if((unexport_f = fopen("/sys/class/gpio/unexport", "w")) == NULL) {
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fprintf(stderr, "Failed to open unexport for writing!\n");
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} else {
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fprintf(unexport_f, "%d", gpio->pin);
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fclose(unexport_f);
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}
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}
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#ifdef __cplusplus
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}
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#endif
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