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selftests: gpio: provide a helper for reading chip info

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Add a simple program that allows to retrieve chip properties from the
GPIO character device. This will be used in gpio-sim selftests.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
This commit is contained in:
Bartosz Golaszewski 2021-12-13 11:21:56 +01:00
parent cb8c474e79
commit 16c138f338
3 changed files with 59 additions and 1 deletions
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1
tools/testing/selftests/gpio/.gitignore vendored
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@ -1,2 +1,3 @@
# SPDX-License-Identifier: GPL-2.0-only
gpio-mockup-cdev
gpio-chip-info

2
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
TEST_GEN_PROGS_EXTENDED := gpio-mockup-cdev gpio-chip-info
include ../lib.mk

57
tools/testing/selftests/gpio/gpio-chip-info.c Normal file
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@ -0,0 +1,57 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* GPIO character device helper for reading chip information.
*
* 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-chip-info <chip path> [name|label|num-lines]\n");
}
int main(int argc, char **argv)
{
struct gpiochip_info info;
int fd, ret;
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));
ret = ioctl(fd, GPIO_GET_CHIPINFO_IOCTL, &info);
if (ret) {
perror("chip info ioctl failed");
return EXIT_FAILURE;
}
if (strcmp(argv[2], "name") == 0) {
printf("%s\n", info.name);
} else if (strcmp(argv[2], "label") == 0) {
printf("%s\n", info.label);
} else if (strcmp(argv[2], "num-lines") == 0) {
printf("%u\n", info.lines);
} else {
fprintf(stderr, "unknown command: %s\n", argv[2]);
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}