From: Bartosz Golaszewski <brgl@bgdev.pl>
To: Kent Gibson <warthog618@gmail.com>,
Linus Walleij <linus.walleij@linaro.org>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Shuah Khan <shuah@kernel.org>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Viresh Kumar <viresh.kumar@linaro.org>
Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-kselftest@vger.kernel.org,
Bartosz Golaszewski <brgl@bgdev.pl>
Subject: [PATCH v13 5/7] selftests: gpio: provide a helper for reading chip info
Date: Tue, 7 Dec 2021 10:34:10 +0100 [thread overview]
Message-ID: <20211207093412.27833-6-brgl@bgdev.pl> (raw)
In-Reply-To: <20211207093412.27833-1-brgl@bgdev.pl>
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>
---
tools/testing/selftests/gpio/.gitignore | 1 +
tools/testing/selftests/gpio/Makefile | 2 +-
tools/testing/selftests/gpio/gpio-chip-info.c | 57 +++++++++++++++++++
3 files changed, 59 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/gpio/gpio-chip-info.c
diff --git a/tools/testing/selftests/gpio/.gitignore b/tools/testing/selftests/gpio/.gitignore
index a4969f7ee020..4ea4f58dab1a 100644
--- a/tools/testing/selftests/gpio/.gitignore
+++ b/tools/testing/selftests/gpio/.gitignore
@@ -1,2 +1,3 @@
# SPDX-License-Identifier: GPL-2.0-only
gpio-mockup-cdev
+gpio-chip-info
diff --git a/tools/testing/selftests/gpio/Makefile b/tools/testing/selftests/gpio/Makefile
index d7b312b44a62..a40b818c394e 100644
--- a/tools/testing/selftests/gpio/Makefile
+++ b/tools/testing/selftests/gpio/Makefile
@@ -2,7 +2,7 @@
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
CFLAGS += -O2 -g -Wall -I../../../../usr/include/
include ../lib.mk
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;
+}
--
2.25.1
next prev parent reply other threads:[~2021-12-07 9:34 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-07 9:34 [PATCH v13 0/7] gpio-sim: configfs-based GPIO simulator Bartosz Golaszewski
2021-12-07 9:34 ` [PATCH v13 1/7] gpiolib: provide gpiod_remove_hogs() Bartosz Golaszewski
2021-12-07 9:34 ` [PATCH v13 2/7] gpiolib: allow to specify the firmware node in struct gpio_chip Bartosz Golaszewski
2021-12-07 12:24 ` Andy Shevchenko
2021-12-07 9:34 ` [PATCH v13 3/7] gpiolib: of: make fwnode take precedence " Bartosz Golaszewski
2021-12-07 12:24 ` Andy Shevchenko
2021-12-07 9:34 ` [PATCH v13 4/7] gpio: sim: new testing module Bartosz Golaszewski
2021-12-07 13:58 ` Andy Shevchenko
2021-12-07 9:34 ` Bartosz Golaszewski [this message]
2021-12-07 9:34 ` [PATCH v13 6/7] selftests: gpio: add a helper for reading GPIO line names Bartosz Golaszewski
2021-12-07 9:34 ` [PATCH v13 7/7] selftests: gpio: add test cases for gpio-sim Bartosz Golaszewski
2021-12-09 0:54 ` [PATCH v13 0/7] gpio-sim: configfs-based GPIO simulator Linus Walleij
2021-12-10 19:08 ` Bartosz Golaszewski
2021-12-13 13:01 ` Bartosz Golaszewski
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