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// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2023 Kent Gibson <warthog618@gmail.com>
/* Minimal example of finding a line with the given name. */
#include <cstdlib>
#include <filesystem>
#include <gpiod.hpp>
#include <iostream>
namespace {
/* Example configuration - customize to suit your situation */
const ::std::string line_name = "GPIO19";
} /* namespace */
int main()
{
/*
* Names are not guaranteed unique, so this finds the first line with
* the given name.
*/
for (const auto &entry :
::std::filesystem::directory_iterator("/dev/")) {
if (::gpiod::is_gpiochip_device(entry.path())) {
::gpiod::chip chip(entry.path());
auto offset = chip.get_line_offset_from_name(line_name);
if (offset >= 0) {
::std::cout << line_name << ": "
<< chip.get_info().name() << " "
<< offset << ::std::endl;
return EXIT_SUCCESS;
}
}
}
::std::cout << "line '" << line_name << "' not found" << ::std::endl;
return EXIT_FAILURE;
}
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