summaryrefslogtreecommitdiff
path: root/sound/core/seq/oss/seq_oss_midi.c
blob: 96e8395ae5863e85a9e4a59c2ca870f9481de141 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
/*
 * OSS compatible sequencer driver
 *
 * MIDI device handlers
 *
 * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.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/asoundef.h>
#include "seq_oss_midi.h"
#include "seq_oss_readq.h"
#include "seq_oss_timer.h"
#include "seq_oss_event.h"
#include <sound/seq_midi_event.h>
#include "../seq_lock.h"
#include <linux/init.h>
#include <linux/slab.h>


/*
 * constants
 */
#define SNDRV_SEQ_OSS_MAX_MIDI_NAME	30

/*
 * definition of midi device record
 */
struct seq_oss_midi {
	int seq_device;		/* device number */
	int client;		/* sequencer client number */
	int port;		/* sequencer port number */
	unsigned int flags;	/* port capability */
	int opened;		/* flag for opening */
	unsigned char name[SNDRV_SEQ_OSS_MAX_MIDI_NAME];
	struct snd_midi_event *coder;	/* MIDI event coder */
	struct seq_oss_devinfo *devinfo;	/* assigned OSSseq device */
	snd_use_lock_t use_lock;
};


/*
 * midi device table
 */
static int max_midi_devs;
static struct seq_oss_midi *midi_devs[SNDRV_SEQ_OSS_MAX_MIDI_DEVS];

static DEFINE_SPINLOCK(register_lock);

/*
 * prototypes
 */
static struct seq_oss_midi *get_mdev(int dev);
static struct seq_oss_midi *get_mididev(struct seq_oss_devinfo *dp, int dev);
static int send_synth_event(struct seq_oss_devinfo *dp, struct snd_seq_event *ev, int dev);
static int send_midi_event(struct seq_oss_devinfo *dp, struct snd_seq_event *ev, struct seq_oss_midi *mdev);

/*
 * look up the existing ports
 * this looks a very exhausting job.
 */
int
snd_seq_oss_midi_lookup_ports(int client)
{
	struct snd_seq_client_info *clinfo;
	struct snd_seq_port_info *pinfo;

	clinfo = kzalloc(sizeof(*clinfo), GFP_KERNEL);
	pinfo = kzalloc(sizeof(*pinfo), GFP_KERNEL);
	if (! clinfo || ! pinfo) {
		kfree(clinfo);
		kfree(pinfo);
		return -ENOMEM;
	}
	clinfo->client = -1;
	while (snd_seq_kernel_client_ctl(client, SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, clinfo) == 0) {
		if (clinfo->client == client)
			continue; /* ignore myself */
		pinfo->addr.client = clinfo->client;
		pinfo->addr.port = -1;
		while (snd_seq_kernel_client_ctl(client, SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, pinfo) == 0)
			snd_seq_oss_midi_check_new_port(pinfo);
	}
	kfree(clinfo);
	kfree(pinfo);
	return 0;
}


/*
 */
static struct seq_oss_midi *
get_mdev(int dev)
{
	struct seq_oss_midi *mdev;
	unsigned long flags;

	spin_lock_irqsave(&register_lock, flags);
	mdev = midi_devs[dev];
	if (mdev)
		snd_use_lock_use(&mdev->use_lock);
	spin_unlock_irqrestore(&register_lock, flags);
	return mdev;
}

/*
 * look for the identical slot
 */
static struct seq_oss_midi *
find_slot(int client, int port)
{
	int i;
	struct seq_oss_midi *mdev;
	unsigned long flags;

	spin_lock_irqsave(&register_lock, flags);
	for (i = 0; i < max_midi_devs; i++) {
		mdev = midi_devs[i];
		if (mdev && mdev->client == client && mdev->port == port) {
			/* found! */
			snd_use_lock_use(&mdev->use_lock);
			spin_unlock_irqrestore(&register_lock, flags);
			return mdev;
		}
	}
	spin_unlock_irqrestore(&register_lock, flags);
	return NULL;
}


#define PERM_WRITE (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
#define PERM_READ (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
/*
 * register a new port if it doesn't exist yet
 */
int
snd_seq_oss_midi_check_new_port(struct snd_seq_port_info *pinfo)
{
	int i;
	struct seq_oss_midi *mdev;
	unsigned long flags;

	/* the port must include generic midi */
	if (! (pinfo->type & SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC))
		return 0;
	/* either read or write subscribable */
	if ((pinfo->capability & PERM_WRITE) != PERM_WRITE &&
	    (pinfo->capability & PERM_READ) != PERM_READ)
		return 0;

	/*
	 * look for the identical slot
	 */
	if ((mdev = find_slot(pinfo->addr.client, pinfo->addr.port)) != NULL) {
		/* already exists */
		snd_use_lock_free(&mdev->use_lock);
		return 0;
	}

	/*
	 * allocate midi info record
	 */
	mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
	if (!mdev)
		return -ENOMEM;

	/* copy the port information */
	mdev->client = pinfo->addr.client;
	mdev->port = pinfo->addr.port;
	mdev->flags = pinfo->capability;
	mdev->opened = 0;
	snd_use_lock_init(&mdev->use_lock);

	/* copy and truncate the name of synth device */
	strlcpy(mdev->name, pinfo->name, sizeof(mdev->name));

	/* create MIDI coder */
	if (snd_midi_event_new(MAX_MIDI_EVENT_BUF, &mdev->coder) < 0) {
		pr_err("ALSA: seq_oss: can't malloc midi coder\n");
		kfree(mdev);
		return -ENOMEM;
	}
	/* OSS sequencer adds running status to all sequences */
	snd_midi_event_no_status(mdev->coder, 1);

	/*
	 * look for en empty slot
	 */
	spin_lock_irqsave(&register_lock, flags);
	for (i = 0; i < max_midi_devs; i++) {
		if (midi_devs[i] == NULL)
			break;
	}
	if (i >= max_midi_devs) {
		if (max_midi_devs >= SNDRV_SEQ_OSS_MAX_MIDI_DEVS) {
			spin_unlock_irqrestore(&register_lock, flags);
			snd_midi_event_free(mdev->coder);
			kfree(mdev);
			return -ENOMEM;
		}
		max_midi_devs++;
	}
	mdev->seq_device = i;
	midi_devs[mdev->seq_device] = mdev;
	spin_unlock_irqrestore(&register_lock, flags);

	return 0;
}

/*
 * release the midi device if it was registered
 */
int
snd_seq_oss_midi_check_exit_port(int client, int port)
{
	struct seq_oss_midi *mdev;
	unsigned long flags;
	int index;

	if ((mdev = find_slot(client, port)) != NULL) {
		spin_lock_irqsave(&register_lock, flags);
		midi_devs[mdev->seq_device] = NULL;
		spin_unlock_irqrestore(&register_lock, flags);
		snd_use_lock_free(&mdev->use_lock);
		snd_use_lock_sync(&mdev->use_lock);
		snd_midi_event_free(mdev->coder);
		kfree(mdev);
	}
	spin_lock_irqsave(&register_lock, flags);
	for (index = max_midi_devs - 1; index >= 0; index--) {
		if (midi_devs[index])
			break;
	}
	max_midi_devs = index + 1;
	spin_unlock_irqrestore(&register_lock, flags);
	return 0;
}


/*
 * release the midi device if it was registered
 */
void
snd_seq_oss_midi_clear_all(void)
{
	int i;
	struct seq_oss_midi *mdev;
	unsigned long flags;

	spin_lock_irqsave(&register_lock, flags);
	for (i = 0; i < max_midi_devs; i++) {
		if ((mdev = midi_devs[i]) != NULL) {
			snd_midi_event_free(mdev->coder);
			kfree(mdev);
			midi_devs[i] = NULL;
		}
	}
	max_midi_devs = 0;
	spin_unlock_irqrestore(&register_lock, flags);
}


/*
 * set up midi tables
 */
void
snd_seq_oss_midi_setup(struct seq_oss_devinfo *dp)
{
	dp->max_mididev = max_midi_devs;
}

/*
 * clean up midi tables
 */
void
snd_seq_oss_midi_cleanup(struct seq_oss_devinfo *dp)
{
	int i;
	for (i = 0; i < dp->max_mididev; i++)
		snd_seq_oss_midi_close(dp, i);
	dp->max_mididev = 0;
}


/*
 * open all midi devices.  ignore errors.
 */
void
snd_seq_oss_midi_open_all(struct seq_oss_devinfo *dp, int file_mode)
{
	int i;
	for (i = 0; i < dp->max_mididev; i++)
		snd_seq_oss_midi_open(dp, i, file_mode);
}


/*
 * get the midi device information
 */
static struct seq_oss_midi *
get_mididev(struct seq_oss_devinfo *dp, int dev)
{
	if (dev < 0 || dev >= dp->max_mididev)
		return NULL;
	return get_mdev(dev);
}


/*
 * open the midi device if not opened yet
 */
int
snd_seq_oss_midi_open(struct seq_oss_devinfo *dp, int dev, int fmode)
{
	int perm;
	struct seq_oss_midi *mdev;
	struct snd_seq_port_subscribe subs;

	if ((mdev = get_mididev(dp, dev)) == NULL)
		return -ENODEV;

	/* already used? */
	if (mdev->opened && mdev->devinfo != dp) {
		snd_use_lock_free(&mdev->use_lock);
		return -EBUSY;
	}

	perm = 0;
	if (is_write_mode(fmode))
		perm |= PERM_WRITE;
	if (is_read_mode(fmode))
		perm |= PERM_READ;
	perm &= mdev->flags;
	if (perm == 0) {
		snd_use_lock_free(&mdev->use_lock);
		return -ENXIO;
	}

	/* already opened? */
	if ((mdev->opened & perm) == perm) {
		snd_use_lock_free(&mdev->use_lock);
		return 0;
	}

	perm &= ~mdev->opened;

	memset(&subs, 0, sizeof(subs));

	if (perm & PERM_WRITE) {
		subs.sender = dp->addr;
		subs.dest.client = mdev->client;
		subs.dest.port = mdev->port;
		if (snd_seq_kernel_client_ctl(dp->cseq, SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, &subs) >= 0)
			mdev->opened |= PERM_WRITE;
	}
	if (perm & PERM_READ) {
		subs.sender.client = mdev->client;
		subs.sender.port = mdev->port;
		subs.dest = dp->addr;
		subs.flags = SNDRV_SEQ_PORT_SUBS_TIMESTAMP;
		subs.queue = dp->queue;		/* queue for timestamps */
		if (snd_seq_kernel_client_ctl(dp->cseq, SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, &subs) >= 0)
			mdev->opened |= PERM_READ;
	}

	if (! mdev->opened) {
		snd_use_lock_free(&mdev->use_lock);
		return -ENXIO;
	}

	mdev->devinfo = dp;
	snd_use_lock_free(&mdev->use_lock);
	return 0;
}

/*
 * close the midi device if already opened
 */
int
snd_seq_oss_midi_close(struct seq_oss_devinfo *dp, int dev)
{
	struct seq_oss_midi *mdev;
	struct snd_seq_port_subscribe subs;

	if ((mdev = get_mididev(dp, dev)) == NULL)
		return -ENODEV;
	if (! mdev->opened || mdev->devinfo != dp) {
		snd_use_lock_free(&mdev->use_lock);
		return 0;
	}

	memset(&subs, 0, sizeof(subs));
	if (mdev->opened & PERM_WRITE) {
		subs.sender = dp->addr;
		subs.dest.client = mdev->client;
		subs.dest.port = mdev->port;
		snd_seq_kernel_client_ctl(dp->cseq, SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, &subs);
	}
	if (mdev->opened & PERM_READ) {
		subs.sender.client = mdev->client;
		subs.sender.port = mdev->port;
		subs.dest = dp->addr;
		snd_seq_kernel_client_ctl(dp->cseq, SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, &subs);
	}

	mdev->opened = 0;
	mdev->devinfo = NULL;

	snd_use_lock_free(&mdev->use_lock);
	return 0;
}

/*
 * change seq capability flags to file mode flags
 */
int
snd_seq_oss_midi_filemode(struct seq_oss_devinfo *dp, int dev)
{
	struct seq_oss_midi *mdev;
	int mode;

	if ((mdev = get_mididev(dp, dev)) == NULL)
		return 0;

	mode = 0;
	if (mdev->opened & PERM_WRITE)
		mode |= SNDRV_SEQ_OSS_FILE_WRITE;
	if (mdev->opened & PERM_READ)
		mode |= SNDRV_SEQ_OSS_FILE_READ;

	snd_use_lock_free(&mdev->use_lock);
	return mode;
}

/*
 * reset the midi device and close it:
 * so far, only close the device.
 */
void
snd_seq_oss_midi_reset(struct seq_oss_devinfo *dp, int dev)
{
	struct seq_oss_midi *mdev;

	if ((mdev = get_mididev(dp, dev)) == NULL)
		return;
	if (! mdev->opened) {
		snd_use_lock_free(&mdev->use_lock);
		return;
	}

	if (mdev->opened & PERM_WRITE) {
		struct snd_seq_event ev;
		int c;

		memset(&ev, 0, sizeof(ev));
		ev.dest.client = mdev->client;
		ev.dest.port = mdev->port;
		ev.queue = dp->queue;
		ev.source.port = dp->port;
		if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_SYNTH) {
			ev.type = SNDRV_SEQ_EVENT_SENSING;
			snd_seq_oss_dispatch(dp, &ev, 0, 0);
		}
		for (c = 0; c < 16; c++) {
			ev.type = SNDRV_SEQ_EVENT_CONTROLLER;
			ev.data.control.channel = c;
			ev.data.control.param = MIDI_CTL_ALL_NOTES_OFF;
			snd_seq_oss_dispatch(dp, &ev, 0, 0);
			if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC) {
				ev.data.control.param =
					MIDI_CTL_RESET_CONTROLLERS;
				snd_seq_oss_dispatch(dp, &ev, 0, 0);
				ev.type = SNDRV_SEQ_EVENT_PITCHBEND;
				ev.data.control.value = 0;
				snd_seq_oss_dispatch(dp, &ev, 0, 0);
			}
		}
	}
	// snd_seq_oss_midi_close(dp, dev);
	snd_use_lock_free(&mdev->use_lock);
}


/*
 * get client/port of the specified MIDI device
 */
void
snd_seq_oss_midi_get_addr(struct seq_oss_devinfo *dp, int dev, struct snd_seq_addr *addr)
{
	struct seq_oss_midi *mdev;

	if ((mdev = get_mididev(dp, dev)) == NULL)
		return;
	addr->client = mdev->client;
	addr->port = mdev->port;
	snd_use_lock_free(&mdev->use_lock);
}


/*
 * input callback - this can be atomic
 */
int
snd_seq_oss_midi_input(struct snd_seq_event *ev, int direct, void *private_data)
{
	struct seq_oss_devinfo *dp = (struct seq_oss_devinfo *)private_data;
	struct seq_oss_midi *mdev;
	int rc;

	if (dp->readq == NULL)
		return 0;
	if ((mdev = find_slot(ev->source.client, ev->source.port)) == NULL)
		return 0;
	if (! (mdev->opened & PERM_READ)) {
		snd_use_lock_free(&mdev->use_lock);
		return 0;
	}

	if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC)
		rc = send_synth_event(dp, ev, mdev->seq_device);
	else
		rc = send_midi_event(dp, ev, mdev);

	snd_use_lock_free(&mdev->use_lock);
	return rc;
}

/*
 * convert ALSA sequencer event to OSS synth event
 */
static int
send_synth_event(struct seq_oss_devinfo *dp, struct snd_seq_event *ev, int dev)
{
	union evrec ossev;

	memset(&ossev, 0, sizeof(ossev));

	switch (ev->type) {
	case SNDRV_SEQ_EVENT_NOTEON:
		ossev.v.cmd = MIDI_NOTEON; break;
	case SNDRV_SEQ_EVENT_NOTEOFF:
		ossev.v.cmd = MIDI_NOTEOFF; break;
	case SNDRV_SEQ_EVENT_KEYPRESS:
		ossev.v.cmd = MIDI_KEY_PRESSURE; break;
	case SNDRV_SEQ_EVENT_CONTROLLER:
		ossev.l.cmd = MIDI_CTL_CHANGE; break;
	case SNDRV_SEQ_EVENT_PGMCHANGE:
		ossev.l.cmd = MIDI_PGM_CHANGE; break;
	case SNDRV_SEQ_EVENT_CHANPRESS:
		ossev.l.cmd = MIDI_CHN_PRESSURE; break;
	case SNDRV_SEQ_EVENT_PITCHBEND:
		ossev.l.cmd = MIDI_PITCH_BEND; break;
	default:
		return 0; /* not supported */
	}

	ossev.v.dev = dev;

	switch (ev->type) {
	case SNDRV_SEQ_EVENT_NOTEON:
	case SNDRV_SEQ_EVENT_NOTEOFF:
	case SNDRV_SEQ_EVENT_KEYPRESS:
		ossev.v.code = EV_CHN_VOICE;
		ossev.v.note = ev->data.note.note;
		ossev.v.parm = ev->data.note.velocity;
		ossev.v.chn = ev->data.note.channel;
		break;
	case SNDRV_SEQ_EVENT_CONTROLLER:
	case SNDRV_SEQ_EVENT_PGMCHANGE:
	case SNDRV_SEQ_EVENT_CHANPRESS:
		ossev.l.code = EV_CHN_COMMON;
		ossev.l.p1 = ev->data.control.param;
		ossev.l.val = ev->data.control.value;
		ossev.l.chn = ev->data.control.channel;
		break;
	case SNDRV_SEQ_EVENT_PITCHBEND:
		ossev.l.code = EV_CHN_COMMON;
		ossev.l.val = ev->data.control.value + 8192;
		ossev.l.chn = ev->data.control.channel;
		break;
	}
	
	snd_seq_oss_readq_put_timestamp(dp->readq, ev->time.tick, dp->seq_mode);
	snd_seq_oss_readq_put_event(dp->readq, &ossev);

	return 0;
}

/*
 * decode event and send MIDI bytes to read queue
 */
static int
send_midi_event(struct seq_oss_devinfo *dp, struct snd_seq_event *ev, struct seq_oss_midi *mdev)
{
	char msg[32];
	int len;
	
	snd_seq_oss_readq_put_timestamp(dp->readq, ev->time.tick, dp->seq_mode);
	if (!dp->timer->running)
		len = snd_seq_oss_timer_start(dp->timer);
	if (ev->type == SNDRV_SEQ_EVENT_SYSEX) {
		if ((ev->flags & SNDRV_SEQ_EVENT_LENGTH_MASK) == SNDRV_SEQ_EVENT_LENGTH_VARIABLE)
			snd_seq_oss_readq_puts(dp->readq, mdev->seq_device,
					       ev->data.ext.ptr, ev->data.ext.len);
	} else {
		len = snd_midi_event_decode(mdev->coder, msg, sizeof(msg), ev);
		if (len > 0)
			snd_seq_oss_readq_puts(dp->readq, mdev->seq_device, msg, len);
	}

	return 0;
}


/*
 * dump midi data
 * return 0 : enqueued
 *        non-zero : invalid - ignored
 */
int
snd_seq_oss_midi_putc(struct seq_oss_devinfo *dp, int dev, unsigned char c, struct snd_seq_event *ev)
{
	struct seq_oss_midi *mdev;

	if ((mdev = get_mididev(dp, dev)) == NULL)
		return -ENODEV;
	if (snd_midi_event_encode_byte(mdev->coder, c, ev) > 0) {
		snd_seq_oss_fill_addr(dp, ev, mdev->client, mdev->port);
		snd_use_lock_free(&mdev->use_lock);
		return 0;
	}
	snd_use_lock_free(&mdev->use_lock);
	return -EINVAL;
}

/*
 * create OSS compatible midi_info record
 */
int
snd_seq_oss_midi_make_info(struct seq_oss_devinfo *dp, int dev, struct midi_info *inf)
{
	struct seq_oss_midi *mdev;

	if ((mdev = get_mididev(dp, dev)) == NULL)
		return -ENXIO;
	inf->device = dev;
	inf->dev_type = 0; /* FIXME: ?? */
	inf->capabilities = 0; /* FIXME: ?? */
	strlcpy(inf->name, mdev->name, sizeof(inf->name));
	snd_use_lock_free(&mdev->use_lock);
	return 0;
}


#ifdef CONFIG_PROC_FS
/*
 * proc interface
 */
static char *
capmode_str(int val)
{
	val &= PERM_READ|PERM_WRITE;
	if (val == (PERM_READ|PERM_WRITE))
		return "read/write";
	else if (val == PERM_READ)
		return "read";
	else if (val == PERM_WRITE)
		return "write";
	else
		return "none";
}

void
snd_seq_oss_midi_info_read(struct snd_info_buffer *buf)
{
	int i;
	struct seq_oss_midi *mdev;

	snd_iprintf(buf, "\nNumber of MIDI devices: %d\n", max_midi_devs);
	for (i = 0; i < max_midi_devs; i++) {
		snd_iprintf(buf, "\nmidi %d: ", i);
		mdev = get_mdev(i);
		if (mdev == NULL) {
			snd_iprintf(buf, "*empty*\n");
			continue;
		}
		snd_iprintf(buf, "[%s] ALSA port %d:%d\n", mdev->name,
			    mdev->client, mdev->port);
		snd_iprintf(buf, "  capability %s / opened %s\n",
			    capmode_str(mdev->flags),
			    capmode_str(mdev->opened));
		snd_use_lock_free(&mdev->use_lock);
	}
}
#endif /* CONFIG_PROC_FS */