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/*
* Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*
* GPIO -- General Purpose Input/Output
*
* Defines a simple and generic interface to access GPIO device.
*
*/
#include <assert.h>
#include <errno.h>
#include <drivers/gpio.h>
/*
* The gpio implementation
*/
static const gpio_ops_t *ops;
int gpio_get_direction(int gpio)
{
assert(ops);
assert(ops->get_direction != 0);
assert(gpio >= 0);
return ops->get_direction(gpio);
}
void gpio_set_direction(int gpio, int direction)
{
assert(ops);
assert(ops->set_direction != 0);
assert((direction == GPIO_DIR_OUT) || (direction == GPIO_DIR_IN));
assert(gpio >= 0);
ops->set_direction(gpio, direction);
}
int gpio_get_value(int gpio)
{
assert(ops);
assert(ops->get_value != 0);
assert(gpio >= 0);
return ops->get_value(gpio);
}
void gpio_set_value(int gpio, int value)
{
assert(ops);
assert(ops->set_value != 0);
assert((value == GPIO_LEVEL_LOW) || (value == GPIO_LEVEL_HIGH));
assert(gpio >= 0);
ops->set_value(gpio, value);
}
void gpio_set_pull(int gpio, int pull)
{
assert(ops);
assert(ops->set_pull != 0);
assert((pull == GPIO_PULL_NONE) || (pull == GPIO_PULL_UP) ||
(pull == GPIO_PULL_DOWN));
assert(gpio >= 0);
ops->set_pull(gpio, pull);
}
int gpio_get_pull(int gpio)
{
assert(ops);
assert(ops->get_pull != 0);
assert(gpio >= 0);
return ops->get_pull(gpio);
}
/*
* Initialize the gpio. The fields in the provided gpio
* ops pointer must be valid.
*/
void gpio_init(const gpio_ops_t *ops_ptr)
{
assert(ops_ptr != 0 &&
(ops_ptr->get_direction != 0) &&
(ops_ptr->set_direction != 0) &&
(ops_ptr->get_value != 0) &&
(ops_ptr->set_value != 0));
ops = ops_ptr;
}
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