aboutsummaryrefslogtreecommitdiff
path: root/tools/leds
diff options
context:
space:
mode:
authorDavid Lechner <david@lechnology.com>2016-09-16 14:16:50 -0500
committerJacek Anaszewski <j.anaszewski@samsung.com>2016-11-22 12:07:02 +0100
commitfa7f32422ea1ac276b45b96a540ed5981caaa61f (patch)
treea11d1dede38a7a7bf9eb45a81b6d4ab31a953e5c /tools/leds
parenteb1ce7469940b4eb8a466d9ae4d032fb2c9969dc (diff)
downloadlinux-stericsson-fa7f32422ea1ac276b45b96a540ed5981caaa61f.tar.gz
tools/leds: Add uledmon program for monitoring userspace LEDs
The uleds driver provides userspace LED devices. This tool is used to create one of these devices and monitor the changes in brighness for testing purposes. Signed-off-by: David Lechner <david@lechnology.com> Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Diffstat (limited to 'tools/leds')
-rw-r--r--tools/leds/.gitignore1
-rw-r--r--tools/leds/Makefile13
-rw-r--r--tools/leds/uledmon.c63
3 files changed, 77 insertions, 0 deletions
diff --git a/tools/leds/.gitignore b/tools/leds/.gitignore
new file mode 100644
index 000000000000..ac96d9f53dfc
--- /dev/null
+++ b/tools/leds/.gitignore
@@ -0,0 +1 @@
+uledmon
diff --git a/tools/leds/Makefile b/tools/leds/Makefile
new file mode 100644
index 000000000000..c03a79ebf9c8
--- /dev/null
+++ b/tools/leds/Makefile
@@ -0,0 +1,13 @@
+# Makefile for LEDs tools
+
+CC = $(CROSS_COMPILE)gcc
+CFLAGS = -Wall -Wextra -g -I../../include/uapi
+
+all: uledmon
+%: %.c
+ $(CC) $(CFLAGS) -o $@ $^
+
+clean:
+ $(RM) uledmon
+
+.PHONY: all clean
diff --git a/tools/leds/uledmon.c b/tools/leds/uledmon.c
new file mode 100644
index 000000000000..25cbc7acf50a
--- /dev/null
+++ b/tools/leds/uledmon.c
@@ -0,0 +1,63 @@
+/*
+ * uledmon.c
+ *
+ * This program creates a new userspace LED class device and monitors it. A
+ * timestamp and brightness value is printed each time the brightness changes.
+ *
+ * Usage: uledmon <device-name>
+ *
+ * <device-name> is the name of the LED class device to be created. Pressing
+ * CTRL+C will exit.
+ */
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+#include <linux/uleds.h>
+
+int main(int argc, char const *argv[])
+{
+ struct uleds_user_dev uleds_dev;
+ int fd, ret;
+ int brightness;
+ struct timespec ts;
+
+ if (argc != 2) {
+ fprintf(stderr, "Requires <device-name> argument\n");
+ return 1;
+ }
+
+ strncpy(uleds_dev.name, argv[1], LED_MAX_NAME_SIZE);
+ uleds_dev.max_brightness = 100;
+
+ fd = open("/dev/uleds", O_RDWR);
+ if (fd == -1) {
+ perror("Failed to open /dev/uleds");
+ return 1;
+ }
+
+ ret = write(fd, &uleds_dev, sizeof(uleds_dev));
+ if (ret == -1) {
+ perror("Failed to write to /dev/uleds");
+ close(fd);
+ return 1;
+ }
+
+ while (1) {
+ ret = read(fd, &brightness, sizeof(brightness));
+ if (ret == -1) {
+ perror("Failed to read from /dev/uleds");
+ close(fd);
+ return 1;
+ }
+ clock_gettime(CLOCK_MONOTONIC, &ts);
+ printf("[%ld.%09ld] %u\n", ts.tv_sec, ts.tv_nsec, brightness);
+ }
+
+ close(fd);
+
+ return 0;
+}