diff --git a/include/sound/opl4.h b/include/sound/opl4.h
new file mode 100644
index 0000000..20c0442
--- /dev/null
+++ b/include/sound/opl4.h
@@ -0,0 +1,32 @@
+#ifndef __SOUND_OPL4_H
+#define __SOUND_OPL4_H
+
+/*
+ * Global definitions for the OPL4 driver
+ * Copyright (c) 2003 by Clemens Ladisch <clemens@ladisch.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#include <sound/opl3.h>
+
+typedef struct opl4 opl4_t;
+
+extern int snd_opl4_create(snd_card_t *card,
+			   unsigned long fm_port, unsigned long pcm_port,
+			   int seq_device,
+			   opl3_t **opl3, opl4_t **opl4);
+
+#endif /* __SOUND_OPL4_H */