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97 lines
2.8 KiB
97 lines
2.8 KiB
9 years ago
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/*
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* Copyright (c) 2016, ARM Limited and Contributors. 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 are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN 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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* 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 <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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/*
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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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