diff options
author | Bartosz Golaszewski <brgl@bgdev.pl> | 2021-12-13 13:21:56 +0300 |
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committer | Bartosz Golaszewski <brgl@bgdev.pl> | 2021-12-17 14:26:13 +0300 |
commit | 16c138f338b62dd0a339b9d0ca819426231be7f6 (patch) | |
tree | 5bc5c7d2e6dc0d55a021306a1fc8f89b87b1ac52 /tools/testing/selftests/gpio/gpio-chip-info.c | |
parent | cb8c474e79be458f58e9df073f51ca159f3a2aa0 (diff) | |
download | linux-16c138f338b62dd0a339b9d0ca819426231be7f6.tar.xz |
selftests: gpio: provide a helper for reading chip info
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>
Diffstat (limited to 'tools/testing/selftests/gpio/gpio-chip-info.c')
-rw-r--r-- | tools/testing/selftests/gpio/gpio-chip-info.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/tools/testing/selftests/gpio/gpio-chip-info.c b/tools/testing/selftests/gpio/gpio-chip-info.c new file mode 100644 index 000000000000..fdc07e742fba --- /dev/null +++ b/tools/testing/selftests/gpio/gpio-chip-info.c @@ -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; +} |