Commit b2bb90c8 authored by Bartosz Golaszewski's avatar Bartosz Golaszewski
Browse files

selftests: gpio: add a helper for reading GPIO line names 



Add a simple program that allows to read GPIO line names from the
character device. This will be used in gpio-sim selftests.

Signed-off-by: default avatarBartosz Golaszewski <brgl@bgdev.pl>
parent 16c138f3

tools/testing/selftests/gpio/.gitignore

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# SPDX-License-Identifier: GPL-2.0-only

gpio-mockup-cdev

gpio-chip-info

gpio-line-name

tools/testing/selftests/gpio/Makefile

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@@ -2,6 +2,6 @@ 


TEST_PROGS := gpio-mockup.sh

TEST_FILES := gpio-mockup-sysfs.sh

TEST_GEN_PROGS_EXTENDED := gpio-mockup-cdev gpio-chip-info

TEST_GEN_PROGS_EXTENDED := gpio-mockup-cdev gpio-chip-info gpio-line-name



include ../lib.mk

tools/testing/selftests/gpio/gpio-line-name.c

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// SPDX-License-Identifier: GPL-2.0-or-later

/*

 * GPIO character device helper for reading line names.

 *

 * Copyright (C) 2021 Bartosz Golaszewski <brgl@bgdev.pl>

 */



#include <fcntl.h>

#include <linux/gpio.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/ioctl.h>

#include <sys/types.h>



static void print_usage(void)

{

	printf("usage:\n");

	printf("  gpio-line-name <chip path> <line offset>\n");

}



int main(int argc, char **argv)

{

	struct gpio_v2_line_info info;

	int fd, ret;

	char *endp;



	if (argc != 3) {

		print_usage();

		return EXIT_FAILURE;

	}



	fd = open(argv[1], O_RDWR);

	if (fd < 0) {

		perror("unable to open the GPIO chip");

		return EXIT_FAILURE;

	}



	memset(&info, 0, sizeof(info));

	info.offset = strtoul(argv[2], &endp, 10);

	if (*endp != '\0') {

		print_usage();

		return EXIT_FAILURE;

	}



	ret = ioctl(fd, GPIO_V2_GET_LINEINFO_IOCTL, &info);

	if (ret) {

		perror("line info ioctl failed");

		return EXIT_FAILURE;

	}



	printf("%s\n", info.name);



	return EXIT_SUCCESS;

}