1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 #ifndef __SOUND_SEQ_VIRMIDI_H
3 #define __SOUND_SEQ_VIRMIDI_H
4
5 /*
6 * Virtual Raw MIDI client on Sequencer
7 * Copyright (c) 2000 by Takashi Iwai <tiwai@suse.de>,
8 * Jaroslav Kysela <perex@perex.cz>
9 */
10
11 #include <sound/rawmidi.h>
12 #include <sound/seq_midi_event.h>
13
14 /*
15 * device file instance:
16 * This instance is created at each time the midi device file is
17 * opened. Each instance has its own input buffer and MIDI parser
18 * (buffer), and is associated with the device instance.
19 */
20 struct snd_virmidi {
21 struct list_head list;
22 int seq_mode;
23 int client;
24 int port;
25 bool trigger;
26 struct snd_midi_event *parser;
27 struct snd_seq_event event;
28 struct snd_virmidi_dev *rdev;
29 struct snd_rawmidi_substream *substream;
30 struct work_struct output_work;
31 };
32
33 #define SNDRV_VIRMIDI_SUBSCRIBE (1<<0)
34 #define SNDRV_VIRMIDI_USE (1<<1)
35
36 /*
37 * device record:
38 * Each virtual midi device has one device instance. It contains
39 * common information and the linked-list of opened files,
40 */
41 struct snd_virmidi_dev {
42 struct snd_card *card; /* associated card */
43 struct snd_rawmidi *rmidi; /* rawmidi device */
44 int seq_mode; /* SNDRV_VIRMIDI_XXX */
45 int device; /* sequencer device */
46 int client; /* created/attached client */
47 int port; /* created/attached port */
48 unsigned int flags; /* SNDRV_VIRMIDI_* */
49 rwlock_t filelist_lock;
50 struct rw_semaphore filelist_sem;
51 struct list_head filelist;
52 };
53
54 /* sequencer mode:
55 * ATTACH = input/output events from midi device are routed to the
56 * attached sequencer port. sequencer port is not created
57 * by virmidi itself.
58 * the input to rawmidi must be processed by passing the
59 * incoming events via snd_virmidi_receive()
60 * DISPATCH = input/output events are routed to subscribers.
61 * sequencer port is created in virmidi.
62 */
63 #define SNDRV_VIRMIDI_SEQ_NONE 0
64 #define SNDRV_VIRMIDI_SEQ_ATTACH 1
65 #define SNDRV_VIRMIDI_SEQ_DISPATCH 2
66
67 int snd_virmidi_new(struct snd_card *card, int device, struct snd_rawmidi **rrmidi);
68
69 #endif /* __SOUND_SEQ_VIRMIDI */