qmk_firmware/usb_extra.h

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#ifndef USB_EXTRA_H
#define USB_EXTRA_H 1
#include <stdint.h>
#include "usb.h"
#define EXTRA_INTERFACE 3
#define EXTRA_ENDPOINT 4
#define EXTRA_SIZE 2
#define EXTRA_BUFFER EP_DOUBLE_BUFFER
#define AUDIO_VOL_UP (1<<0)
#define AUDIO_VOL_DOWN (1<<1)
#define AUDIO_MUTE (1<<2)
int8_t usb_extra_send(uint8_t bits);
#endif