ROCCAT_CBUF_SIZE
reader->cbuf_start = (reader->cbuf_start + 1) % ROCCAT_CBUF_SIZE;
device->cbuf_end = (device->cbuf_end + 1) % ROCCAT_CBUF_SIZE;
reader->cbuf_start = (reader->cbuf_start + 1) % ROCCAT_CBUF_SIZE;
struct roccat_report cbuf[ROCCAT_CBUF_SIZE];