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