// SPDX-License-Identifier: GPL-2.0 /* * 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; }