HPI_MIXER_OPEN
hpi_init_message_response(&hm, &hr, HPI_OBJ_MIXER, HPI_MIXER_OPEN);
case HPI_MIXER_OPEN:
hpi_init_message_response(&hm, &hr, HPI_OBJ_MIXER, HPI_MIXER_OPEN);
hpi_init_response(&hr, HPI_OBJ_MIXER, HPI_MIXER_OPEN,