diff options
| -rw-r--r-- | tools/Makefile | 7 | ||||
| -rw-r--r-- | tools/leds/.gitignore | 1 | ||||
| -rw-r--r-- | tools/leds/Makefile | 13 | ||||
| -rw-r--r-- | tools/leds/uledmon.c | 63 |
4 files changed, 81 insertions, 3 deletions
diff --git a/tools/Makefile b/tools/Makefile index daa8fb3e4363..00caacd3ed92 100644 --- a/tools/Makefile +++ b/tools/Makefile @@ -17,6 +17,7 @@ help: @echo ' hv - tools used when in Hyper-V clients' @echo ' iio - IIO tools' @echo ' kvm_stat - top-like utility for displaying kvm statistics' + @echo ' leds - LEDs tools' @echo ' lguest - a minimal 32-bit x86 hypervisor' @echo ' net - misc networking tools' @echo ' perf - Linux performance measurement and analysis tool' @@ -56,7 +57,7 @@ acpi: FORCE cpupower: FORCE $(call descend,power/$@) -cgroup firewire hv guest spi usb virtio vm net iio gpio objtool: FORCE +cgroup firewire hv guest spi usb virtio vm net iio gpio objtool leds: FORCE $(call descend,$@) liblockdep: FORCE @@ -126,7 +127,7 @@ acpi_clean: cpupower_clean: $(call descend,power/cpupower,clean) -cgroup_clean hv_clean firewire_clean lguest_clean spi_clean usb_clean virtio_clean vm_clean net_clean iio_clean gpio_clean objtool_clean: +cgroup_clean hv_clean firewire_clean lguest_clean spi_clean usb_clean virtio_clean vm_clean net_clean iio_clean gpio_clean objtool_clean leds_clean: $(call descend,$(@:_clean=),clean) liblockdep_clean: @@ -164,6 +165,6 @@ clean: acpi_clean cgroup_clean cpupower_clean hv_clean firewire_clean lguest_cle perf_clean selftests_clean turbostat_clean spi_clean usb_clean virtio_clean \ vm_clean net_clean iio_clean x86_energy_perf_policy_clean tmon_clean \ freefall_clean build_clean libbpf_clean libsubcmd_clean liblockdep_clean \ - gpio_clean objtool_clean + gpio_clean objtool_clean leds_clean .PHONY: FORCE 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; +} |