106 lines
3.3 KiB
C
106 lines
3.3 KiB
C
/*-
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* Copyright (c) 2013-2014 Rui Paulo <rpaulo@felyko.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _LIBGPIO_H_
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#define _LIBGPIO_H_
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#include <sys/gpio.h>
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#include <stdint.h>
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__BEGIN_DECLS
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#define GPIO_INVALID_HANDLE -1
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typedef int gpio_handle_t;
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typedef uint32_t gpio_pin_t;
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/*
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* Structure describing a GPIO pin configuration.
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*/
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typedef struct {
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gpio_pin_t g_pin;
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char g_name[GPIOMAXNAME];
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uint32_t g_caps;
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uint32_t g_flags;
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} gpio_config_t;
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typedef enum {
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GPIO_VALUE_INVALID = -1,
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GPIO_VALUE_LOW = GPIO_PIN_LOW,
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GPIO_VALUE_HIGH = GPIO_PIN_HIGH
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} gpio_value_t;
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/*
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* Open /dev/gpiocN or a specific device.
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*/
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gpio_handle_t gpio_open(unsigned int);
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gpio_handle_t gpio_open_device(const char *);
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void gpio_close(gpio_handle_t);
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/*
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* Get a list of all the GPIO pins.
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*/
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int gpio_pin_list(gpio_handle_t, gpio_config_t **);
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/*
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* GPIO pin configuration.
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*
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* Retrieve the configuration of a specific GPIO pin. The pin number is
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* passed through the gpio_config_t structure.
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*/
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int gpio_pin_config(gpio_handle_t, gpio_config_t *);
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/*
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* Sets the GPIO flags on a specific GPIO pin. The pin number and the flags
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* to be set are passed through the gpio_config_t structure.
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*/
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int gpio_pin_set_flags(gpio_handle_t, gpio_config_t *);
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/*
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* GPIO pin values.
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*/
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int gpio_pin_get(gpio_handle_t, gpio_pin_t);
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int gpio_pin_set(gpio_handle_t, gpio_pin_t, int);
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int gpio_pin_toggle(gpio_handle_t, gpio_pin_t);
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/*
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* Helper functions to set pin states.
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*/
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int gpio_pin_low(gpio_handle_t, gpio_pin_t);
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int gpio_pin_high(gpio_handle_t, gpio_pin_t);
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/*
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* Helper functions to configure pins.
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*/
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int gpio_pin_input(gpio_handle_t, gpio_pin_t);
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int gpio_pin_output(gpio_handle_t, gpio_pin_t);
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int gpio_pin_opendrain(gpio_handle_t, gpio_pin_t);
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int gpio_pin_pushpull(gpio_handle_t, gpio_pin_t);
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int gpio_pin_tristate(gpio_handle_t, gpio_pin_t);
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int gpio_pin_pullup(gpio_handle_t, gpio_pin_t);
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int gpio_pin_pulldown(gpio_handle_t, gpio_pin_t);
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int gpio_pin_invin(gpio_handle_t, gpio_pin_t);
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int gpio_pin_invout(gpio_handle_t, gpio_pin_t);
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int gpio_pin_pulsate(gpio_handle_t, gpio_pin_t);
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__END_DECLS
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#endif /* _LIBGPIO_H_ */
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