1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * OSS compatible sequencer driver
4 *
5 * MIDI device handlers
6 *
7 * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>
8 */
9
10 #include <sound/asoundef.h>
11 #include "seq_oss_midi.h"
12 #include "seq_oss_readq.h"
13 #include "seq_oss_timer.h"
14 #include "seq_oss_event.h"
15 #include <sound/seq_midi_event.h>
16 #include "../seq_lock.h"
17 #include <linux/init.h>
18 #include <linux/slab.h>
19 #include <linux/nospec.h>
20
21
22 /*
23 * constants
24 */
25 #define SNDRV_SEQ_OSS_MAX_MIDI_NAME 30
26
27 /*
28 * definition of midi device record
29 */
30 struct seq_oss_midi {
31 int seq_device; /* device number */
32 int client; /* sequencer client number */
33 int port; /* sequencer port number */
34 unsigned int flags; /* port capability */
35 int opened; /* flag for opening */
36 unsigned char name[SNDRV_SEQ_OSS_MAX_MIDI_NAME];
37 struct snd_midi_event *coder; /* MIDI event coder */
38 struct seq_oss_devinfo *devinfo; /* assigned OSSseq device */
39 snd_use_lock_t use_lock;
40 };
41
42
43 /*
44 * midi device table
45 */
46 static int max_midi_devs;
47 static struct seq_oss_midi *midi_devs[SNDRV_SEQ_OSS_MAX_MIDI_DEVS];
48
49 static DEFINE_SPINLOCK(register_lock);
50
51 /*
52 * prototypes
53 */
54 static struct seq_oss_midi *get_mdev(int dev);
55 static struct seq_oss_midi *get_mididev(struct seq_oss_devinfo *dp, int dev);
56 static int send_synth_event(struct seq_oss_devinfo *dp, struct snd_seq_event *ev, int dev);
57 static int send_midi_event(struct seq_oss_devinfo *dp, struct snd_seq_event *ev, struct seq_oss_midi *mdev);
58
59 /*
60 * look up the existing ports
61 * this looks a very exhausting job.
62 */
63 int
snd_seq_oss_midi_lookup_ports(int client)64 snd_seq_oss_midi_lookup_ports(int client)
65 {
66 struct snd_seq_client_info *clinfo;
67 struct snd_seq_port_info *pinfo;
68
69 clinfo = kzalloc(sizeof(*clinfo), GFP_KERNEL);
70 pinfo = kzalloc(sizeof(*pinfo), GFP_KERNEL);
71 if (! clinfo || ! pinfo) {
72 kfree(clinfo);
73 kfree(pinfo);
74 return -ENOMEM;
75 }
76 clinfo->client = -1;
77 while (snd_seq_kernel_client_ctl(client, SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, clinfo) == 0) {
78 if (clinfo->client == client)
79 continue; /* ignore myself */
80 pinfo->addr.client = clinfo->client;
81 pinfo->addr.port = -1;
82 while (snd_seq_kernel_client_ctl(client, SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, pinfo) == 0)
83 snd_seq_oss_midi_check_new_port(pinfo);
84 }
85 kfree(clinfo);
86 kfree(pinfo);
87 return 0;
88 }
89
90
91 /*
92 */
93 static struct seq_oss_midi *
get_mdev(int dev)94 get_mdev(int dev)
95 {
96 struct seq_oss_midi *mdev;
97 unsigned long flags;
98
99 spin_lock_irqsave(®ister_lock, flags);
100 mdev = midi_devs[dev];
101 if (mdev)
102 snd_use_lock_use(&mdev->use_lock);
103 spin_unlock_irqrestore(®ister_lock, flags);
104 return mdev;
105 }
106
107 /*
108 * look for the identical slot
109 */
110 static struct seq_oss_midi *
find_slot(int client,int port)111 find_slot(int client, int port)
112 {
113 int i;
114 struct seq_oss_midi *mdev;
115 unsigned long flags;
116
117 spin_lock_irqsave(®ister_lock, flags);
118 for (i = 0; i < max_midi_devs; i++) {
119 mdev = midi_devs[i];
120 if (mdev && mdev->client == client && mdev->port == port) {
121 /* found! */
122 snd_use_lock_use(&mdev->use_lock);
123 spin_unlock_irqrestore(®ister_lock, flags);
124 return mdev;
125 }
126 }
127 spin_unlock_irqrestore(®ister_lock, flags);
128 return NULL;
129 }
130
131
132 #define PERM_WRITE (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
133 #define PERM_READ (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
134 /*
135 * register a new port if it doesn't exist yet
136 */
137 int
snd_seq_oss_midi_check_new_port(struct snd_seq_port_info * pinfo)138 snd_seq_oss_midi_check_new_port(struct snd_seq_port_info *pinfo)
139 {
140 int i;
141 struct seq_oss_midi *mdev;
142 unsigned long flags;
143
144 /* the port must include generic midi */
145 if (! (pinfo->type & SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC))
146 return 0;
147 /* either read or write subscribable */
148 if ((pinfo->capability & PERM_WRITE) != PERM_WRITE &&
149 (pinfo->capability & PERM_READ) != PERM_READ)
150 return 0;
151
152 /*
153 * look for the identical slot
154 */
155 mdev = find_slot(pinfo->addr.client, pinfo->addr.port);
156 if (mdev) {
157 /* already exists */
158 snd_use_lock_free(&mdev->use_lock);
159 return 0;
160 }
161
162 /*
163 * allocate midi info record
164 */
165 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
166 if (!mdev)
167 return -ENOMEM;
168
169 /* copy the port information */
170 mdev->client = pinfo->addr.client;
171 mdev->port = pinfo->addr.port;
172 mdev->flags = pinfo->capability;
173 mdev->opened = 0;
174 snd_use_lock_init(&mdev->use_lock);
175
176 /* copy and truncate the name of synth device */
177 strscpy(mdev->name, pinfo->name, sizeof(mdev->name));
178
179 /* create MIDI coder */
180 if (snd_midi_event_new(MAX_MIDI_EVENT_BUF, &mdev->coder) < 0) {
181 pr_err("ALSA: seq_oss: can't malloc midi coder\n");
182 kfree(mdev);
183 return -ENOMEM;
184 }
185 /* OSS sequencer adds running status to all sequences */
186 snd_midi_event_no_status(mdev->coder, 1);
187
188 /*
189 * look for en empty slot
190 */
191 spin_lock_irqsave(®ister_lock, flags);
192 for (i = 0; i < max_midi_devs; i++) {
193 if (midi_devs[i] == NULL)
194 break;
195 }
196 if (i >= max_midi_devs) {
197 if (max_midi_devs >= SNDRV_SEQ_OSS_MAX_MIDI_DEVS) {
198 spin_unlock_irqrestore(®ister_lock, flags);
199 snd_midi_event_free(mdev->coder);
200 kfree(mdev);
201 return -ENOMEM;
202 }
203 max_midi_devs++;
204 }
205 mdev->seq_device = i;
206 midi_devs[mdev->seq_device] = mdev;
207 spin_unlock_irqrestore(®ister_lock, flags);
208
209 return 0;
210 }
211
212 /*
213 * release the midi device if it was registered
214 */
215 int
snd_seq_oss_midi_check_exit_port(int client,int port)216 snd_seq_oss_midi_check_exit_port(int client, int port)
217 {
218 struct seq_oss_midi *mdev;
219 unsigned long flags;
220 int index;
221
222 mdev = find_slot(client, port);
223 if (mdev) {
224 spin_lock_irqsave(®ister_lock, flags);
225 midi_devs[mdev->seq_device] = NULL;
226 spin_unlock_irqrestore(®ister_lock, flags);
227 snd_use_lock_free(&mdev->use_lock);
228 snd_use_lock_sync(&mdev->use_lock);
229 snd_midi_event_free(mdev->coder);
230 kfree(mdev);
231 }
232 spin_lock_irqsave(®ister_lock, flags);
233 for (index = max_midi_devs - 1; index >= 0; index--) {
234 if (midi_devs[index])
235 break;
236 }
237 max_midi_devs = index + 1;
238 spin_unlock_irqrestore(®ister_lock, flags);
239 return 0;
240 }
241
242
243 /*
244 * release the midi device if it was registered
245 */
246 void
snd_seq_oss_midi_clear_all(void)247 snd_seq_oss_midi_clear_all(void)
248 {
249 int i;
250 struct seq_oss_midi *mdev;
251 unsigned long flags;
252
253 spin_lock_irqsave(®ister_lock, flags);
254 for (i = 0; i < max_midi_devs; i++) {
255 mdev = midi_devs[i];
256 if (mdev) {
257 snd_midi_event_free(mdev->coder);
258 kfree(mdev);
259 midi_devs[i] = NULL;
260 }
261 }
262 max_midi_devs = 0;
263 spin_unlock_irqrestore(®ister_lock, flags);
264 }
265
266
267 /*
268 * set up midi tables
269 */
270 void
snd_seq_oss_midi_setup(struct seq_oss_devinfo * dp)271 snd_seq_oss_midi_setup(struct seq_oss_devinfo *dp)
272 {
273 dp->max_mididev = max_midi_devs;
274 }
275
276 /*
277 * clean up midi tables
278 */
279 void
snd_seq_oss_midi_cleanup(struct seq_oss_devinfo * dp)280 snd_seq_oss_midi_cleanup(struct seq_oss_devinfo *dp)
281 {
282 int i;
283 for (i = 0; i < dp->max_mididev; i++)
284 snd_seq_oss_midi_close(dp, i);
285 dp->max_mididev = 0;
286 }
287
288
289 /*
290 * open all midi devices. ignore errors.
291 */
292 void
snd_seq_oss_midi_open_all(struct seq_oss_devinfo * dp,int file_mode)293 snd_seq_oss_midi_open_all(struct seq_oss_devinfo *dp, int file_mode)
294 {
295 int i;
296 for (i = 0; i < dp->max_mididev; i++)
297 snd_seq_oss_midi_open(dp, i, file_mode);
298 }
299
300
301 /*
302 * get the midi device information
303 */
304 static struct seq_oss_midi *
get_mididev(struct seq_oss_devinfo * dp,int dev)305 get_mididev(struct seq_oss_devinfo *dp, int dev)
306 {
307 if (dev < 0 || dev >= dp->max_mididev)
308 return NULL;
309 dev = array_index_nospec(dev, dp->max_mididev);
310 return get_mdev(dev);
311 }
312
313
314 /*
315 * open the midi device if not opened yet
316 */
317 int
snd_seq_oss_midi_open(struct seq_oss_devinfo * dp,int dev,int fmode)318 snd_seq_oss_midi_open(struct seq_oss_devinfo *dp, int dev, int fmode)
319 {
320 int perm;
321 struct seq_oss_midi *mdev;
322 struct snd_seq_port_subscribe subs;
323
324 mdev = get_mididev(dp, dev);
325 if (!mdev)
326 return -ENODEV;
327
328 /* already used? */
329 if (mdev->opened && mdev->devinfo != dp) {
330 snd_use_lock_free(&mdev->use_lock);
331 return -EBUSY;
332 }
333
334 perm = 0;
335 if (is_write_mode(fmode))
336 perm |= PERM_WRITE;
337 if (is_read_mode(fmode))
338 perm |= PERM_READ;
339 perm &= mdev->flags;
340 if (perm == 0) {
341 snd_use_lock_free(&mdev->use_lock);
342 return -ENXIO;
343 }
344
345 /* already opened? */
346 if ((mdev->opened & perm) == perm) {
347 snd_use_lock_free(&mdev->use_lock);
348 return 0;
349 }
350
351 perm &= ~mdev->opened;
352
353 memset(&subs, 0, sizeof(subs));
354
355 if (perm & PERM_WRITE) {
356 subs.sender = dp->addr;
357 subs.dest.client = mdev->client;
358 subs.dest.port = mdev->port;
359 if (snd_seq_kernel_client_ctl(dp->cseq, SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, &subs) >= 0)
360 mdev->opened |= PERM_WRITE;
361 }
362 if (perm & PERM_READ) {
363 subs.sender.client = mdev->client;
364 subs.sender.port = mdev->port;
365 subs.dest = dp->addr;
366 subs.flags = SNDRV_SEQ_PORT_SUBS_TIMESTAMP;
367 subs.queue = dp->queue; /* queue for timestamps */
368 if (snd_seq_kernel_client_ctl(dp->cseq, SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, &subs) >= 0)
369 mdev->opened |= PERM_READ;
370 }
371
372 if (! mdev->opened) {
373 snd_use_lock_free(&mdev->use_lock);
374 return -ENXIO;
375 }
376
377 mdev->devinfo = dp;
378 snd_use_lock_free(&mdev->use_lock);
379 return 0;
380 }
381
382 /*
383 * close the midi device if already opened
384 */
385 int
snd_seq_oss_midi_close(struct seq_oss_devinfo * dp,int dev)386 snd_seq_oss_midi_close(struct seq_oss_devinfo *dp, int dev)
387 {
388 struct seq_oss_midi *mdev;
389 struct snd_seq_port_subscribe subs;
390
391 mdev = get_mididev(dp, dev);
392 if (!mdev)
393 return -ENODEV;
394 if (! mdev->opened || mdev->devinfo != dp) {
395 snd_use_lock_free(&mdev->use_lock);
396 return 0;
397 }
398
399 memset(&subs, 0, sizeof(subs));
400 if (mdev->opened & PERM_WRITE) {
401 subs.sender = dp->addr;
402 subs.dest.client = mdev->client;
403 subs.dest.port = mdev->port;
404 snd_seq_kernel_client_ctl(dp->cseq, SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, &subs);
405 }
406 if (mdev->opened & PERM_READ) {
407 subs.sender.client = mdev->client;
408 subs.sender.port = mdev->port;
409 subs.dest = dp->addr;
410 snd_seq_kernel_client_ctl(dp->cseq, SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, &subs);
411 }
412
413 mdev->opened = 0;
414 mdev->devinfo = NULL;
415
416 snd_use_lock_free(&mdev->use_lock);
417 return 0;
418 }
419
420 /*
421 * change seq capability flags to file mode flags
422 */
423 int
snd_seq_oss_midi_filemode(struct seq_oss_devinfo * dp,int dev)424 snd_seq_oss_midi_filemode(struct seq_oss_devinfo *dp, int dev)
425 {
426 struct seq_oss_midi *mdev;
427 int mode;
428
429 mdev = get_mididev(dp, dev);
430 if (!mdev)
431 return 0;
432
433 mode = 0;
434 if (mdev->opened & PERM_WRITE)
435 mode |= SNDRV_SEQ_OSS_FILE_WRITE;
436 if (mdev->opened & PERM_READ)
437 mode |= SNDRV_SEQ_OSS_FILE_READ;
438
439 snd_use_lock_free(&mdev->use_lock);
440 return mode;
441 }
442
443 /*
444 * reset the midi device and close it:
445 * so far, only close the device.
446 */
447 void
snd_seq_oss_midi_reset(struct seq_oss_devinfo * dp,int dev)448 snd_seq_oss_midi_reset(struct seq_oss_devinfo *dp, int dev)
449 {
450 struct seq_oss_midi *mdev;
451
452 mdev = get_mididev(dp, dev);
453 if (!mdev)
454 return;
455 if (! mdev->opened) {
456 snd_use_lock_free(&mdev->use_lock);
457 return;
458 }
459
460 if (mdev->opened & PERM_WRITE) {
461 struct snd_seq_event ev;
462 int c;
463
464 memset(&ev, 0, sizeof(ev));
465 ev.dest.client = mdev->client;
466 ev.dest.port = mdev->port;
467 ev.queue = dp->queue;
468 ev.source.port = dp->port;
469 if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_SYNTH) {
470 ev.type = SNDRV_SEQ_EVENT_SENSING;
471 snd_seq_oss_dispatch(dp, &ev, 0, 0);
472 }
473 for (c = 0; c < 16; c++) {
474 ev.type = SNDRV_SEQ_EVENT_CONTROLLER;
475 ev.data.control.channel = c;
476 ev.data.control.param = MIDI_CTL_ALL_NOTES_OFF;
477 snd_seq_oss_dispatch(dp, &ev, 0, 0);
478 if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC) {
479 ev.data.control.param =
480 MIDI_CTL_RESET_CONTROLLERS;
481 snd_seq_oss_dispatch(dp, &ev, 0, 0);
482 ev.type = SNDRV_SEQ_EVENT_PITCHBEND;
483 ev.data.control.value = 0;
484 snd_seq_oss_dispatch(dp, &ev, 0, 0);
485 }
486 }
487 }
488 // snd_seq_oss_midi_close(dp, dev);
489 snd_use_lock_free(&mdev->use_lock);
490 }
491
492
493 /*
494 * get client/port of the specified MIDI device
495 */
496 void
snd_seq_oss_midi_get_addr(struct seq_oss_devinfo * dp,int dev,struct snd_seq_addr * addr)497 snd_seq_oss_midi_get_addr(struct seq_oss_devinfo *dp, int dev, struct snd_seq_addr *addr)
498 {
499 struct seq_oss_midi *mdev;
500
501 mdev = get_mididev(dp, dev);
502 if (!mdev)
503 return;
504 addr->client = mdev->client;
505 addr->port = mdev->port;
506 snd_use_lock_free(&mdev->use_lock);
507 }
508
509
510 /*
511 * input callback - this can be atomic
512 */
513 int
snd_seq_oss_midi_input(struct snd_seq_event * ev,int direct,void * private_data)514 snd_seq_oss_midi_input(struct snd_seq_event *ev, int direct, void *private_data)
515 {
516 struct seq_oss_devinfo *dp = (struct seq_oss_devinfo *)private_data;
517 struct seq_oss_midi *mdev;
518 int rc;
519
520 if (dp->readq == NULL)
521 return 0;
522 mdev = find_slot(ev->source.client, ev->source.port);
523 if (!mdev)
524 return 0;
525 if (! (mdev->opened & PERM_READ)) {
526 snd_use_lock_free(&mdev->use_lock);
527 return 0;
528 }
529
530 if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC)
531 rc = send_synth_event(dp, ev, mdev->seq_device);
532 else
533 rc = send_midi_event(dp, ev, mdev);
534
535 snd_use_lock_free(&mdev->use_lock);
536 return rc;
537 }
538
539 /*
540 * convert ALSA sequencer event to OSS synth event
541 */
542 static int
send_synth_event(struct seq_oss_devinfo * dp,struct snd_seq_event * ev,int dev)543 send_synth_event(struct seq_oss_devinfo *dp, struct snd_seq_event *ev, int dev)
544 {
545 union evrec ossev;
546
547 memset(&ossev, 0, sizeof(ossev));
548
549 switch (ev->type) {
550 case SNDRV_SEQ_EVENT_NOTEON:
551 ossev.v.cmd = MIDI_NOTEON; break;
552 case SNDRV_SEQ_EVENT_NOTEOFF:
553 ossev.v.cmd = MIDI_NOTEOFF; break;
554 case SNDRV_SEQ_EVENT_KEYPRESS:
555 ossev.v.cmd = MIDI_KEY_PRESSURE; break;
556 case SNDRV_SEQ_EVENT_CONTROLLER:
557 ossev.l.cmd = MIDI_CTL_CHANGE; break;
558 case SNDRV_SEQ_EVENT_PGMCHANGE:
559 ossev.l.cmd = MIDI_PGM_CHANGE; break;
560 case SNDRV_SEQ_EVENT_CHANPRESS:
561 ossev.l.cmd = MIDI_CHN_PRESSURE; break;
562 case SNDRV_SEQ_EVENT_PITCHBEND:
563 ossev.l.cmd = MIDI_PITCH_BEND; break;
564 default:
565 return 0; /* not supported */
566 }
567
568 ossev.v.dev = dev;
569
570 switch (ev->type) {
571 case SNDRV_SEQ_EVENT_NOTEON:
572 case SNDRV_SEQ_EVENT_NOTEOFF:
573 case SNDRV_SEQ_EVENT_KEYPRESS:
574 ossev.v.code = EV_CHN_VOICE;
575 ossev.v.note = ev->data.note.note;
576 ossev.v.parm = ev->data.note.velocity;
577 ossev.v.chn = ev->data.note.channel;
578 break;
579 case SNDRV_SEQ_EVENT_CONTROLLER:
580 case SNDRV_SEQ_EVENT_PGMCHANGE:
581 case SNDRV_SEQ_EVENT_CHANPRESS:
582 ossev.l.code = EV_CHN_COMMON;
583 ossev.l.p1 = ev->data.control.param;
584 ossev.l.val = ev->data.control.value;
585 ossev.l.chn = ev->data.control.channel;
586 break;
587 case SNDRV_SEQ_EVENT_PITCHBEND:
588 ossev.l.code = EV_CHN_COMMON;
589 ossev.l.val = ev->data.control.value + 8192;
590 ossev.l.chn = ev->data.control.channel;
591 break;
592 }
593
594 snd_seq_oss_readq_put_timestamp(dp->readq, ev->time.tick, dp->seq_mode);
595 snd_seq_oss_readq_put_event(dp->readq, &ossev);
596
597 return 0;
598 }
599
600 /*
601 * decode event and send MIDI bytes to read queue
602 */
603 static int
send_midi_event(struct seq_oss_devinfo * dp,struct snd_seq_event * ev,struct seq_oss_midi * mdev)604 send_midi_event(struct seq_oss_devinfo *dp, struct snd_seq_event *ev, struct seq_oss_midi *mdev)
605 {
606 char msg[32];
607 int len;
608
609 snd_seq_oss_readq_put_timestamp(dp->readq, ev->time.tick, dp->seq_mode);
610 if (!dp->timer->running)
611 len = snd_seq_oss_timer_start(dp->timer);
612 if (ev->type == SNDRV_SEQ_EVENT_SYSEX) {
613 snd_seq_oss_readq_sysex(dp->readq, mdev->seq_device, ev);
614 snd_midi_event_reset_decode(mdev->coder);
615 } else {
616 len = snd_midi_event_decode(mdev->coder, msg, sizeof(msg), ev);
617 if (len > 0)
618 snd_seq_oss_readq_puts(dp->readq, mdev->seq_device, msg, len);
619 }
620
621 return 0;
622 }
623
624
625 /*
626 * dump midi data
627 * return 0 : enqueued
628 * non-zero : invalid - ignored
629 */
630 int
snd_seq_oss_midi_putc(struct seq_oss_devinfo * dp,int dev,unsigned char c,struct snd_seq_event * ev)631 snd_seq_oss_midi_putc(struct seq_oss_devinfo *dp, int dev, unsigned char c, struct snd_seq_event *ev)
632 {
633 struct seq_oss_midi *mdev;
634
635 mdev = get_mididev(dp, dev);
636 if (!mdev)
637 return -ENODEV;
638 if (snd_midi_event_encode_byte(mdev->coder, c, ev)) {
639 snd_seq_oss_fill_addr(dp, ev, mdev->client, mdev->port);
640 snd_use_lock_free(&mdev->use_lock);
641 return 0;
642 }
643 snd_use_lock_free(&mdev->use_lock);
644 return -EINVAL;
645 }
646
647 /*
648 * create OSS compatible midi_info record
649 */
650 int
snd_seq_oss_midi_make_info(struct seq_oss_devinfo * dp,int dev,struct midi_info * inf)651 snd_seq_oss_midi_make_info(struct seq_oss_devinfo *dp, int dev, struct midi_info *inf)
652 {
653 struct seq_oss_midi *mdev;
654
655 mdev = get_mididev(dp, dev);
656 if (!mdev)
657 return -ENXIO;
658 inf->device = dev;
659 inf->dev_type = 0; /* FIXME: ?? */
660 inf->capabilities = 0; /* FIXME: ?? */
661 strscpy(inf->name, mdev->name, sizeof(inf->name));
662 snd_use_lock_free(&mdev->use_lock);
663 return 0;
664 }
665
666
667 #ifdef CONFIG_SND_PROC_FS
668 /*
669 * proc interface
670 */
671 static char *
capmode_str(int val)672 capmode_str(int val)
673 {
674 val &= PERM_READ|PERM_WRITE;
675 if (val == (PERM_READ|PERM_WRITE))
676 return "read/write";
677 else if (val == PERM_READ)
678 return "read";
679 else if (val == PERM_WRITE)
680 return "write";
681 else
682 return "none";
683 }
684
685 void
snd_seq_oss_midi_info_read(struct snd_info_buffer * buf)686 snd_seq_oss_midi_info_read(struct snd_info_buffer *buf)
687 {
688 int i;
689 struct seq_oss_midi *mdev;
690
691 snd_iprintf(buf, "\nNumber of MIDI devices: %d\n", max_midi_devs);
692 for (i = 0; i < max_midi_devs; i++) {
693 snd_iprintf(buf, "\nmidi %d: ", i);
694 mdev = get_mdev(i);
695 if (mdev == NULL) {
696 snd_iprintf(buf, "*empty*\n");
697 continue;
698 }
699 snd_iprintf(buf, "[%s] ALSA port %d:%d\n", mdev->name,
700 mdev->client, mdev->port);
701 snd_iprintf(buf, " capability %s / opened %s\n",
702 capmode_str(mdev->flags),
703 capmode_str(mdev->opened));
704 snd_use_lock_free(&mdev->use_lock);
705 }
706 }
707 #endif /* CONFIG_SND_PROC_FS */
708
