snd_legacy_find_free_ioport
mpuport[ndev] = snd_legacy_find_free_ioport(mpu_ports, 2);
port = snd_legacy_find_free_ioport(possible_ports, 4);
mpu_port = snd_legacy_find_free_ioport(possible_mpu_ports, 2);
port = snd_legacy_find_free_ioport(possible_ports, 4);
mpu_port = snd_legacy_find_free_ioport(possible_mpu_ports, 2);