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diff --git a/sound/oss/dm.h b/sound/oss/dm.h
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+#ifndef _DRIVERS_SOUND_DM_H
+#define _DRIVERS_SOUND_DM_H
+
+/*
+ * Definitions of the 'direct midi sound' interface used
+ * by the newer commercial OSS package. We should export
+ * this to userland somewhere in glibc later.
+ */
+
+/*
+ * Data structure composing an FM "note" or sound event.
+ */
+
+struct dm_fm_voice
+{
+ u8 op;
+ u8 voice;
+ u8 am;
+ u8 vibrato;
+ u8 do_sustain;
+ u8 kbd_scale;
+ u8 harmonic;
+ u8 scale_level;
+ u8 volume;
+ u8 attack;
+ u8 decay;
+ u8 sustain;
+ u8 release;
+ u8 feedback;
+ u8 connection;
+ u8 left;
+ u8 right;
+ u8 waveform;
+};
+
+/*
+ * This describes an FM note by its voice, octave, frequency number (10bit)
+ * and key on/off.
+ */
+
+struct dm_fm_note
+{
+ u8 voice;
+ u8 octave;
+ u32 fnum;
+ u8 key_on;
+};
+
+/*
+ * FM parameters that apply globally to all voices, and thus are not "notes"
+ */
+
+struct dm_fm_params
+{
+ u8 am_depth;
+ u8 vib_depth;
+ u8 kbd_split;
+ u8 rhythm;
+
+ /* This block is the percussion instrument data */
+ u8 bass;
+ u8 snare;
+ u8 tomtom;
+ u8 cymbal;
+ u8 hihat;
+};
+
+/*
+ * FM mode ioctl settings
+ */
+
+#define FM_IOCTL_RESET 0x20
+#define FM_IOCTL_PLAY_NOTE 0x21
+#define FM_IOCTL_SET_VOICE 0x22
+#define FM_IOCTL_SET_PARAMS 0x23
+#define FM_IOCTL_SET_MODE 0x24
+#define FM_IOCTL_SET_OPL 0x25
+
+#endif