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/*
// Copyright (c) 2018 Intel Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
*/
#include <gpioutils.hpp>
static constexpr const char* pathExport = "/sys/class/gpio/export";
static constexpr const char* pathUnexport = "/sys/class/gpio/unexport";
static constexpr const char* prefix = "/sys/class/gpio/gpio";
static constexpr const char* postfixValue = "/value";
static constexpr const char* postfixDirection = "/direction";
Gpio::Gpio(std::string number) : gpioNumber(number)
{
gpioExport();
}
bool Gpio::gpioExist()
{
return std::experimental::filesystem::exists(prefix + gpioNumber);
}
void Gpio::gpioExport()
{
if (!gpioExist())
{
std::fstream gpioExport;
gpioExport.open(pathExport, std::ios::out);
if (gpioExport.good())
{
gpioExport << gpioNumber;
}
gpioExport.close();
}
}
void Gpio::gpioUnexport()
{
if (gpioExist())
{
std::fstream gpioExport;
gpioExport.open(pathUnexport, std::ios::out);
if (gpioExport.good())
{
gpioExport << gpioNumber;
}
gpioExport.close();
}
}
GpioValue Gpio::getValue()
{
std::fstream gpioFile;
std::string gpioValue;
std::string gpioFilePath = prefix + gpioNumber + postfixValue;
gpioFile.open(gpioFilePath, std::ios::in);
if (gpioFile.good())
{
gpioFile >> gpioValue;
}
gpioFile.close();
return gpioValue == "0" ? GpioValue::low : GpioValue::high;
}
void Gpio::setValue(const GpioValue& value)
{
std::fstream gpioFile;
std::string gpioFilePath = prefix + gpioNumber + postfixValue;
setDirection("out");
gpioFile.open(gpioFilePath, std::ios::out);
if (gpioFile.good())
{
gpioFile << std::to_string((uint8_t)value);
}
gpioFile.close();
}
std::string Gpio::getDirection()
{
std::fstream gpioFile;
std::string gpioFilePath = prefix + gpioNumber + postfixDirection;
std::string direction;
gpioFile.open(gpioFilePath, std::ios::in);
if (gpioFile.good())
{
gpioFile >> direction;
}
gpioFile.close();
return direction;
}
void Gpio::setDirection(const std::string& direction)
{
std::fstream gpioFile;
std::string gpioFilePath = prefix + gpioNumber + postfixDirection;
gpioFile.open(gpioFilePath, std::ios::out);
if (gpioFile.good())
{
gpioFile << direction;
}
gpioFile.close();
}
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