#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <errno.h>

#define DEVICE_NAME "/dev/audio_mixer"
#define AUDIO_IOC_MAGIC 'A'
#define AUDIO_IOC_SET_VOLUME _IOW(AUDIO_IOC_MAGIC, 0, int)
#define AUDIO_IOC_MUTE _IOW(AUDIO_IOC_MAGIC, 1, int)
#define AUDIO_IOC_RESET _IO(AUDIO_IOC_MAGIC, 2)

int main() {
    int fd = open(DEVICE_NAME, O_RDWR);
    if (fd < 0) {
        perror("Failed to open the device");
        return errno;
    }

    int volume = 75;
    if (ioctl(fd, AUDIO_IOC_SET_VOLUME, &volume) < 0) {
        perror("Failed to set volume");
        close(fd);
        return errno;
    }

    if (ioctl(fd, AUDIO_IOC_MUTE) < 0) {
        perror("Failed to mute channels");
        close(fd);
        return errno;
    }

    if (ioctl(fd, AUDIO_IOC_RESET) < 0) {
        perror("Failed to reset channels");
        close(fd);
        return errno;
    }

    close(fd);
    return 0;
}