/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef __SOUND_SEQ_VIRMIDI_H
#define __SOUND_SEQ_VIRMIDI_H

/*
 *  Virtual Raw MIDI client on Sequencer
 *  Copyright (c) 2000 by Takashi Iwai <tiwai@suse.de>,
 *                        Jaroslav Kysela <perex@perex.cz>
 */

#include <sound/rawmidi.h>
#include <sound/seq_midi_event.h>

/*
 * device file instance:
 * This instance is created at each time the midi device file is
 * opened.  Each instance has its own input buffer and MIDI parser
 * (buffer), and is associated with the device instance.
 */
struct snd_virmidi {
        struct list_head list;
        int seq_mode;
        int client;
        int port;
        bool trigger;
        struct snd_midi_event *parser;
        struct snd_seq_event event;
        struct snd_virmidi_dev *rdev;
        struct snd_rawmidi_substream *substream;
        struct work_struct output_work;
};

#define SNDRV_VIRMIDI_SUBSCRIBE         (1<<0)
#define SNDRV_VIRMIDI_USE               (1<<1)

/*
 * device record:
 * Each virtual midi device has one device instance.  It contains
 * common information and the linked-list of opened files, 
 */
struct snd_virmidi_dev {
        struct snd_card *card;          /* associated card */
        struct snd_rawmidi *rmidi;              /* rawmidi device */
        int seq_mode;                   /* SNDRV_VIRMIDI_XXX */
        int device;                     /* sequencer device */
        int client;                     /* created/attached client */
        int port;                       /* created/attached port */
        unsigned int flags;             /* SNDRV_VIRMIDI_* */
        rwlock_t filelist_lock;
        struct rw_semaphore filelist_sem;
        struct list_head filelist;
};

/* sequencer mode:
 * ATTACH = input/output events from midi device are routed to the
 *          attached sequencer port.  sequencer port is not created
 *          by virmidi itself.
 *          the input to rawmidi must be processed by passing the
 *          incoming events via snd_virmidi_receive()
 * DISPATCH = input/output events are routed to subscribers.
 *            sequencer port is created in virmidi.
 */
#define SNDRV_VIRMIDI_SEQ_NONE          0
#define SNDRV_VIRMIDI_SEQ_ATTACH        1
#define SNDRV_VIRMIDI_SEQ_DISPATCH      2

int snd_virmidi_new(struct snd_card *card, int device, struct snd_rawmidi **rrmidi);

#endif /* __SOUND_SEQ_VIRMIDI */