gpio_sysfs.h

#ifndef __GPIO_SYSFS_H
#define __GPIO_SYSFS_H

typedef enum bool_enum { false, true } bool;

#include <stdint.h>

#define IN              false
#define OUT             true

#define GPIO_FILENAME_CHAR_SIZE     7

#define GPIODIR             "/sys/class/gpio/"
#define EXPORTFILE          GPIODIR"export"
#define UNEXPORTFILE            GPIODIR"unexport"

#define GPIO_OUT            "out"
#define GPIO_IN             "in"

#define FILE_ERROR          2
#define GPIO_WRONG_DIRECTION_ERROR  3
#define GPIO_NOT_EXPORTED_ERROR     4
#define GPIO_ALREADY_EXPORTED_ERROR 5

bool is_gpio_exported(uint8_t gpio);
uint8_t gpio_export(uint8_t gpio);
uint8_t gpio_unexport(uint8_t gpio);
uint8_t gpio_change_direction(uint8_t gpio, char *direction);
uint8_t gpio_read_direction(uint8_t gpio, char *d);
uint8_t gpio_write(uint8_t gpio, bool value);
uint8_t gpio_read(uint8_t gpio, uint8_t *v);

#endif