1 /*-
2 * Copyright (c) 2003 Mathew Kanner
3 * Copyright (c) 1998 The NetBSD Foundation, Inc.
4 * All rights reserved.
5 *
6 * This code is derived from software contributed to The NetBSD Foundation
7 * by Lennart Augustsson (augustss@netbsd.org).
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 /*
32 * Parts of this file started out as NetBSD: midi.c 1.31
33 * They are mostly gone. Still the most obvious will be the state
34 * machine midi_in
35 */
36
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
39
40 #include <sys/param.h>
41 #include <sys/queue.h>
42 #include <sys/kernel.h>
43 #include <sys/lock.h>
44 #include <sys/mutex.h>
45 #include <sys/proc.h>
46 #include <sys/signalvar.h>
47 #include <sys/conf.h>
48 #include <sys/selinfo.h>
49 #include <sys/sysctl.h>
50 #include <sys/types.h>
51 #include <sys/malloc.h>
52 #include <sys/param.h>
53 #include <sys/systm.h>
54 #include <sys/proc.h>
55 #include <sys/fcntl.h>
56 #include <sys/types.h>
57 #include <sys/uio.h>
58 #include <sys/poll.h>
59 #include <sys/sbuf.h>
60 #include <sys/kobj.h>
61 #include <sys/module.h>
62
63 #ifdef HAVE_KERNEL_OPTION_HEADERS
64 #include "opt_snd.h"
65 #endif
66
67 #include <dev/sound/midi/midi.h>
68 #include "mpu_if.h"
69
70 #include <dev/sound/midi/midiq.h>
71 #include "synth_if.h"
72 MALLOC_DEFINE(M_MIDI, "midi buffers", "Midi data allocation area");
73
74 #ifndef KOBJMETHOD_END
75 #define KOBJMETHOD_END { NULL, NULL }
76 #endif
77
78 #define PCMMKMINOR(u, d, c) ((((c) & 0xff) << 16) | (((u) & 0x0f) << 4) | ((d) & 0x0f))
79 #define MIDIMKMINOR(u, d, c) PCMMKMINOR(u, d, c)
80
81 #define MIDI_DEV_RAW 2
82 #define MIDI_DEV_MIDICTL 12
83
84 enum midi_states {
85 MIDI_IN_START, MIDI_IN_SYSEX, MIDI_IN_DATA
86 };
87
88 /*
89 * The MPU interface current has init() uninit() inqsize() outqsize()
90 * callback() : fiddle with the tx|rx status.
91 */
92
93 #include "mpu_if.h"
94
95 /*
96 * /dev/rmidi Structure definitions
97 */
98
99 #define MIDI_NAMELEN 16
100 struct snd_midi {
101 KOBJ_FIELDS;
102 struct mtx lock; /* Protects all but queues */
103 void *cookie;
104
105 int unit; /* Should only be used in midistat */
106 int channel; /* Should only be used in midistat */
107
108 int busy;
109 int flags; /* File flags */
110 char name[MIDI_NAMELEN];
111 struct mtx qlock; /* Protects inq, outq and flags */
112 MIDIQ_HEAD(, char) inq, outq;
113 int rchan, wchan;
114 struct selinfo rsel, wsel;
115 int hiwat; /* QLEN(outq)>High-water -> disable
116 * writes from userland */
117 enum midi_states inq_state;
118 int inq_status, inq_left; /* Variables for the state machine in
119 * Midi_in, this is to provide that
120 * signals only get issued only
121 * complete command packets. */
122 struct proc *async;
123 struct cdev *dev;
124 struct synth_midi *synth;
125 int synth_flags;
126 TAILQ_ENTRY(snd_midi) link;
127 };
128
129 struct synth_midi {
130 KOBJ_FIELDS;
131 struct snd_midi *m;
132 };
133
134 static synth_open_t midisynth_open;
135 static synth_close_t midisynth_close;
136 static synth_writeraw_t midisynth_writeraw;
137 static synth_killnote_t midisynth_killnote;
138 static synth_startnote_t midisynth_startnote;
139 static synth_setinstr_t midisynth_setinstr;
140 static synth_alloc_t midisynth_alloc;
141 static synth_controller_t midisynth_controller;
142 static synth_bender_t midisynth_bender;
143
144
145 static kobj_method_t midisynth_methods[] = {
146 KOBJMETHOD(synth_open, midisynth_open),
147 KOBJMETHOD(synth_close, midisynth_close),
148 KOBJMETHOD(synth_writeraw, midisynth_writeraw),
149 KOBJMETHOD(synth_setinstr, midisynth_setinstr),
150 KOBJMETHOD(synth_startnote, midisynth_startnote),
151 KOBJMETHOD(synth_killnote, midisynth_killnote),
152 KOBJMETHOD(synth_alloc, midisynth_alloc),
153 KOBJMETHOD(synth_controller, midisynth_controller),
154 KOBJMETHOD(synth_bender, midisynth_bender),
155 KOBJMETHOD_END
156 };
157
158 DEFINE_CLASS(midisynth, midisynth_methods, 0);
159
160 /*
161 * Module Exports & Interface
162 *
163 * struct midi_chan *midi_init(MPU_CLASS cls, int unit, int chan,
164 * void *cookie)
165 * int midi_uninit(struct snd_midi *)
166 *
167 * 0 == no error
168 * EBUSY or other error
169 *
170 * int midi_in(struct snd_midi *, char *buf, int count)
171 * int midi_out(struct snd_midi *, char *buf, int count)
172 *
173 * midi_{in,out} return actual size transfered
174 *
175 */
176
177
178 /*
179 * midi_devs tailq, holder of all rmidi instances protected by midistat_lock
180 */
181
182 TAILQ_HEAD(, snd_midi) midi_devs;
183
184 /*
185 * /dev/midistat variables and declarations, protected by midistat_lock
186 */
187
188 static struct mtx midistat_lock;
189 static int midistat_isopen = 0;
190 static struct sbuf midistat_sbuf;
191 static int midistat_bufptr;
192 static struct cdev *midistat_dev;
193
194 /*
195 * /dev/midistat dev_t declarations
196 */
197
198 static d_open_t midistat_open;
199 static d_close_t midistat_close;
200 static d_read_t midistat_read;
201
202 static struct cdevsw midistat_cdevsw = {
203 .d_version = D_VERSION,
204 .d_open = midistat_open,
205 .d_close = midistat_close,
206 .d_read = midistat_read,
207 .d_name = "midistat",
208 };
209
210
211 /*
212 * /dev/rmidi dev_t declarations, struct variable access is protected by
213 * locks contained within the structure.
214 */
215
216 static d_open_t midi_open;
217 static d_close_t midi_close;
218 static d_ioctl_t midi_ioctl;
219 static d_read_t midi_read;
220 static d_write_t midi_write;
221 static d_poll_t midi_poll;
222
223 static struct cdevsw midi_cdevsw = {
224 .d_version = D_VERSION,
225 .d_open = midi_open,
226 .d_close = midi_close,
227 .d_read = midi_read,
228 .d_write = midi_write,
229 .d_ioctl = midi_ioctl,
230 .d_poll = midi_poll,
231 .d_name = "rmidi",
232 };
233
234 /*
235 * Prototypes of library functions
236 */
237
238 static int midi_destroy(struct snd_midi *, int);
239 static int midistat_prepare(struct sbuf * s);
240 static int midi_load(void);
241 static int midi_unload(void);
242
243 /*
244 * Misc declr.
245 */
246 SYSCTL_NODE(_hw, OID_AUTO, midi, CTLFLAG_RD, 0, "Midi driver");
247 static SYSCTL_NODE(_hw_midi, OID_AUTO, stat, CTLFLAG_RD, 0, "Status device");
248
249 int midi_debug;
250 /* XXX: should this be moved into debug.midi? */
251 SYSCTL_INT(_hw_midi, OID_AUTO, debug, CTLFLAG_RW, &midi_debug, 0, "");
252
253 int midi_dumpraw;
254 SYSCTL_INT(_hw_midi, OID_AUTO, dumpraw, CTLFLAG_RW, &midi_dumpraw, 0, "");
255
256 int midi_instroff;
257 SYSCTL_INT(_hw_midi, OID_AUTO, instroff, CTLFLAG_RW, &midi_instroff, 0, "");
258
259 int midistat_verbose;
260 SYSCTL_INT(_hw_midi_stat, OID_AUTO, verbose, CTLFLAG_RW,
261 &midistat_verbose, 0, "");
262
263 #define MIDI_DEBUG(l,a) if(midi_debug>=l) a
264 /*
265 * CODE START
266 */
267
268 /*
269 * Register a new rmidi device. cls midi_if interface unit == 0 means
270 * auto-assign new unit number unit != 0 already assigned a unit number, eg.
271 * not the first channel provided by this device. channel, sub-unit
272 * cookie is passed back on MPU calls Typical device drivers will call with
273 * unit=0, channel=1..(number of channels) and cookie=soft_c and won't care
274 * what unit number is used.
275 *
276 * It is an error to call midi_init with an already used unit/channel combo.
277 *
278 * Returns NULL on error
279 *
280 */
281 struct snd_midi *
282 midi_init(kobj_class_t cls, int unit, int channel, void *cookie)
283 {
284 struct snd_midi *m;
285 int i;
286 int inqsize, outqsize;
287 MIDI_TYPE *buf;
288
289 MIDI_DEBUG(1, printf("midiinit: unit %d/%d.\n", unit, channel));
290 mtx_lock(&midistat_lock);
291 /*
292 * Protect against call with existing unit/channel or auto-allocate a
293 * new unit number.
294 */
295 i = -1;
296 TAILQ_FOREACH(m, &midi_devs, link) {
297 mtx_lock(&m->lock);
298 if (unit != 0) {
299 if (m->unit == unit && m->channel == channel) {
300 mtx_unlock(&m->lock);
301 goto err0;
302 }
303 } else {
304 /*
305 * Find a better unit number
306 */
307 if (m->unit > i)
308 i = m->unit;
309 }
310 mtx_unlock(&m->lock);
311 }
312
313 if (unit == 0)
314 unit = i + 1;
315
316 MIDI_DEBUG(1, printf("midiinit #2: unit %d/%d.\n", unit, channel));
317 m = malloc(sizeof(*m), M_MIDI, M_NOWAIT | M_ZERO);
318 if (m == NULL)
319 goto err0;
320
321 m->synth = malloc(sizeof(*m->synth), M_MIDI, M_NOWAIT | M_ZERO);
322 kobj_init((kobj_t)m->synth, &midisynth_class);
323 m->synth->m = m;
324 kobj_init((kobj_t)m, cls);
325 inqsize = MPU_INQSIZE(m, cookie);
326 outqsize = MPU_OUTQSIZE(m, cookie);
327
328 MIDI_DEBUG(1, printf("midiinit queues %d/%d.\n", inqsize, outqsize));
329 if (!inqsize && !outqsize)
330 goto err1;
331
332 mtx_init(&m->lock, "raw midi", NULL, 0);
333 mtx_init(&m->qlock, "q raw midi", NULL, 0);
334
335 mtx_lock(&m->lock);
336 mtx_lock(&m->qlock);
337
338 if (inqsize)
339 buf = malloc(sizeof(MIDI_TYPE) * inqsize, M_MIDI, M_NOWAIT);
340 else
341 buf = NULL;
342
343 MIDIQ_INIT(m->inq, buf, inqsize);
344
345 if (outqsize)
346 buf = malloc(sizeof(MIDI_TYPE) * outqsize, M_MIDI, M_NOWAIT);
347 else
348 buf = NULL;
349 m->hiwat = outqsize / 2;
350
351 MIDIQ_INIT(m->outq, buf, outqsize);
352
353 if ((inqsize && !MIDIQ_BUF(m->inq)) ||
354 (outqsize && !MIDIQ_BUF(m->outq)))
355 goto err2;
356
357
358 m->busy = 0;
359 m->flags = 0;
360 m->unit = unit;
361 m->channel = channel;
362 m->cookie = cookie;
363
364 if (MPU_INIT(m, cookie))
365 goto err2;
366
367 mtx_unlock(&m->lock);
368 mtx_unlock(&m->qlock);
369
370 TAILQ_INSERT_TAIL(&midi_devs, m, link);
371
372 mtx_unlock(&midistat_lock);
373
374 m->dev = make_dev(&midi_cdevsw,
375 MIDIMKMINOR(unit, MIDI_DEV_RAW, channel),
376 UID_ROOT, GID_WHEEL, 0666, "midi%d.%d", unit, channel);
377 m->dev->si_drv1 = m;
378
379 return m;
380
381 err2: mtx_destroy(&m->qlock);
382 mtx_destroy(&m->lock);
383
384 if (MIDIQ_BUF(m->inq))
385 free(MIDIQ_BUF(m->inq), M_MIDI);
386 if (MIDIQ_BUF(m->outq))
387 free(MIDIQ_BUF(m->outq), M_MIDI);
388 err1: free(m, M_MIDI);
389 err0: mtx_unlock(&midistat_lock);
390 MIDI_DEBUG(1, printf("midi_init ended in error\n"));
391 return NULL;
392 }
393
394 /*
395 * midi_uninit does not call MIDI_UNINIT, as since this is the implementors
396 * entry point. midi_uninit if fact, does not send any methods. A call to
397 * midi_uninit is a defacto promise that you won't manipulate ch anymore
398 *
399 */
400
401 int
402 midi_uninit(struct snd_midi *m)
403 {
404 int err;
405
406 err = EBUSY;
407 mtx_lock(&midistat_lock);
408 mtx_lock(&m->lock);
409 if (m->busy) {
410 if (!(m->rchan || m->wchan))
411 goto err;
412
413 if (m->rchan) {
414 wakeup(&m->rchan);
415 m->rchan = 0;
416 }
417 if (m->wchan) {
418 wakeup(&m->wchan);
419 m->wchan = 0;
420 }
421 }
422 err = midi_destroy(m, 0);
423 if (!err)
424 goto exit;
425
426 err: mtx_unlock(&m->lock);
427 exit: mtx_unlock(&midistat_lock);
428 return err;
429 }
430
431 /*
432 * midi_in: process all data until the queue is full, then discards the rest.
433 * Since midi_in is a state machine, data discards can cause it to get out of
434 * whack. Process as much as possible. It calls, wakeup, selnotify and
435 * psignal at most once.
436 */
437
438 #ifdef notdef
439 static int midi_lengths[] = {2, 2, 2, 2, 1, 1, 2, 0};
440
441 #endif /* notdef */
442 /* Number of bytes in a MIDI command */
443 #define MIDI_LENGTH(d) (midi_lengths[((d) >> 4) & 7])
444 #define MIDI_ACK 0xfe
445 #define MIDI_IS_STATUS(d) ((d) >= 0x80)
446 #define MIDI_IS_COMMON(d) ((d) >= 0xf0)
447
448 #define MIDI_SYSEX_START 0xF0
449 #define MIDI_SYSEX_END 0xF7
450
451
452 int
453 midi_in(struct snd_midi *m, MIDI_TYPE *buf, int size)
454 {
455 /* int i, sig, enq; */
456 int used;
457
458 /* MIDI_TYPE data; */
459 MIDI_DEBUG(5, printf("midi_in: m=%p size=%d\n", m, size));
460
461 /*
462 * XXX: locking flub
463 */
464 if (!(m->flags & M_RX))
465 return size;
466
467 used = 0;
468
469 mtx_lock(&m->qlock);
470 #if 0
471 /*
472 * Don't bother queuing if not in read mode. Discard everything and
473 * return size so the caller doesn't freak out.
474 */
475
476 if (!(m->flags & M_RX))
477 return size;
478
479 for (i = sig = 0; i < size; i++) {
480
481 data = buf[i];
482 enq = 0;
483 if (data == MIDI_ACK)
484 continue;
485
486 switch (m->inq_state) {
487 case MIDI_IN_START:
488 if (MIDI_IS_STATUS(data)) {
489 switch (data) {
490 case 0xf0: /* Sysex */
491 m->inq_state = MIDI_IN_SYSEX;
492 break;
493 case 0xf1: /* MTC quarter frame */
494 case 0xf3: /* Song select */
495 m->inq_state = MIDI_IN_DATA;
496 enq = 1;
497 m->inq_left = 1;
498 break;
499 case 0xf2: /* Song position pointer */
500 m->inq_state = MIDI_IN_DATA;
501 enq = 1;
502 m->inq_left = 2;
503 break;
504 default:
505 if (MIDI_IS_COMMON(data)) {
506 enq = 1;
507 sig = 1;
508 } else {
509 m->inq_state = MIDI_IN_DATA;
510 enq = 1;
511 m->inq_status = data;
512 m->inq_left = MIDI_LENGTH(data);
513 }
514 break;
515 }
516 } else if (MIDI_IS_STATUS(m->inq_status)) {
517 m->inq_state = MIDI_IN_DATA;
518 if (!MIDIQ_FULL(m->inq)) {
519 used++;
520 MIDIQ_ENQ(m->inq, &m->inq_status, 1);
521 }
522 enq = 1;
523 m->inq_left = MIDI_LENGTH(m->inq_status) - 1;
524 }
525 break;
526 /*
527 * End of case MIDI_IN_START:
528 */
529
530 case MIDI_IN_DATA:
531 enq = 1;
532 if (--m->inq_left <= 0)
533 sig = 1;/* deliver data */
534 break;
535 case MIDI_IN_SYSEX:
536 if (data == MIDI_SYSEX_END)
537 m->inq_state = MIDI_IN_START;
538 break;
539 }
540
541 if (enq)
542 if (!MIDIQ_FULL(m->inq)) {
543 MIDIQ_ENQ(m->inq, &data, 1);
544 used++;
545 }
546 /*
547 * End of the state machines main "for loop"
548 */
549 }
550 if (sig) {
551 #endif
552 MIDI_DEBUG(6, printf("midi_in: len %jd avail %jd\n",
553 (intmax_t)MIDIQ_LEN(m->inq),
554 (intmax_t)MIDIQ_AVAIL(m->inq)));
555 if (MIDIQ_AVAIL(m->inq) > size) {
556 used = size;
557 MIDIQ_ENQ(m->inq, buf, size);
558 } else {
559 MIDI_DEBUG(4, printf("midi_in: Discarding data qu\n"));
560 mtx_unlock(&m->qlock);
561 return 0;
562 }
563 if (m->rchan) {
564 wakeup(&m->rchan);
565 m->rchan = 0;
566 }
567 selwakeup(&m->rsel);
568 if (m->async) {
569 PROC_LOCK(m->async);
570 kern_psignal(m->async, SIGIO);
571 PROC_UNLOCK(m->async);
572 }
573 #if 0
574 }
575 #endif
576 mtx_unlock(&m->qlock);
577 return used;
578 }
579
580 /*
581 * midi_out: The only clearer of the M_TXEN flag.
582 */
583 int
584 midi_out(struct snd_midi *m, MIDI_TYPE *buf, int size)
585 {
586 int used;
587
588 /*
589 * XXX: locking flub
590 */
591 if (!(m->flags & M_TXEN))
592 return 0;
593
594 MIDI_DEBUG(2, printf("midi_out: %p\n", m));
595 mtx_lock(&m->qlock);
596 used = MIN(size, MIDIQ_LEN(m->outq));
597 MIDI_DEBUG(3, printf("midi_out: used %d\n", used));
598 if (used)
599 MIDIQ_DEQ(m->outq, buf, used);
600 if (MIDIQ_EMPTY(m->outq)) {
601 m->flags &= ~M_TXEN;
602 MPU_CALLBACKP(m, m->cookie, m->flags);
603 }
604 if (used && MIDIQ_AVAIL(m->outq) > m->hiwat) {
605 if (m->wchan) {
606 wakeup(&m->wchan);
607 m->wchan = 0;
608 }
609 selwakeup(&m->wsel);
610 if (m->async) {
611 PROC_LOCK(m->async);
612 kern_psignal(m->async, SIGIO);
613 PROC_UNLOCK(m->async);
614 }
615 }
616 mtx_unlock(&m->qlock);
617 return used;
618 }
619
620
621 /*
622 * /dev/rmidi#.# device access functions
623 */
624 int
625 midi_open(struct cdev *i_dev, int flags, int mode, struct thread *td)
626 {
627 struct snd_midi *m = i_dev->si_drv1;
628 int retval;
629
630 MIDI_DEBUG(1, printf("midiopen %p %s %s\n", td,
631 flags & FREAD ? "M_RX" : "", flags & FWRITE ? "M_TX" : ""));
632 if (m == NULL)
633 return ENXIO;
634
635 mtx_lock(&m->lock);
636 mtx_lock(&m->qlock);
637
638 retval = 0;
639
640 if (flags & FREAD) {
641 if (MIDIQ_SIZE(m->inq) == 0)
642 retval = ENXIO;
643 else if (m->flags & M_RX)
644 retval = EBUSY;
645 if (retval)
646 goto err;
647 }
648 if (flags & FWRITE) {
649 if (MIDIQ_SIZE(m->outq) == 0)
650 retval = ENXIO;
651 else if (m->flags & M_TX)
652 retval = EBUSY;
653 if (retval)
654 goto err;
655 }
656 m->busy++;
657
658 m->rchan = 0;
659 m->wchan = 0;
660 m->async = 0;
661
662 if (flags & FREAD) {
663 m->flags |= M_RX | M_RXEN;
664 /*
665 * Only clear the inq, the outq might still have data to drain
666 * from a previous session
667 */
668 MIDIQ_CLEAR(m->inq);
669 };
670
671 if (flags & FWRITE)
672 m->flags |= M_TX;
673
674 MPU_CALLBACK(m, m->cookie, m->flags);
675
676 MIDI_DEBUG(2, printf("midi_open: opened.\n"));
677
678 err: mtx_unlock(&m->qlock);
679 mtx_unlock(&m->lock);
680 return retval;
681 }
682
683 int
684 midi_close(struct cdev *i_dev, int flags, int mode, struct thread *td)
685 {
686 struct snd_midi *m = i_dev->si_drv1;
687 int retval;
688 int oldflags;
689
690 MIDI_DEBUG(1, printf("midi_close %p %s %s\n", td,
691 flags & FREAD ? "M_RX" : "", flags & FWRITE ? "M_TX" : ""));
692
693 if (m == NULL)
694 return ENXIO;
695
696 mtx_lock(&m->lock);
697 mtx_lock(&m->qlock);
698
699 if ((flags & FREAD && !(m->flags & M_RX)) ||
700 (flags & FWRITE && !(m->flags & M_TX))) {
701 retval = ENXIO;
702 goto err;
703 }
704 m->busy--;
705
706 oldflags = m->flags;
707
708 if (flags & FREAD)
709 m->flags &= ~(M_RX | M_RXEN);
710 if (flags & FWRITE)
711 m->flags &= ~M_TX;
712
713 if ((m->flags & (M_TXEN | M_RXEN)) != (oldflags & (M_RXEN | M_TXEN)))
714 MPU_CALLBACK(m, m->cookie, m->flags);
715
716 MIDI_DEBUG(1, printf("midi_close: closed, busy = %d.\n", m->busy));
717
718 mtx_unlock(&m->qlock);
719 mtx_unlock(&m->lock);
720 retval = 0;
721 err: return retval;
722 }
723
724 /*
725 * TODO: midi_read, per oss programmer's guide pg. 42 should return as soon
726 * as data is available.
727 */
728 int
729 midi_read(struct cdev *i_dev, struct uio *uio, int ioflag)
730 {
731 #define MIDI_RSIZE 32
732 struct snd_midi *m = i_dev->si_drv1;
733 int retval;
734 int used;
735 char buf[MIDI_RSIZE];
736
737 MIDI_DEBUG(5, printf("midiread: count=%lu\n",
738 (unsigned long)uio->uio_resid));
739
740 retval = EIO;
741
742 if (m == NULL)
743 goto err0;
744
745 mtx_lock(&m->lock);
746 mtx_lock(&m->qlock);
747
748 if (!(m->flags & M_RX))
749 goto err1;
750
751 while (uio->uio_resid > 0) {
752 while (MIDIQ_EMPTY(m->inq)) {
753 retval = EWOULDBLOCK;
754 if (ioflag & O_NONBLOCK)
755 goto err1;
756 mtx_unlock(&m->lock);
757 m->rchan = 1;
758 retval = msleep(&m->rchan, &m->qlock,
759 PCATCH | PDROP, "midi RX", 0);
760 /*
761 * We slept, maybe things have changed since last
762 * dying check
763 */
764 if (retval == EINTR)
765 goto err0;
766 if (m != i_dev->si_drv1)
767 retval = ENXIO;
768 /* if (retval && retval != ERESTART) */
769 if (retval)
770 goto err0;
771 mtx_lock(&m->lock);
772 mtx_lock(&m->qlock);
773 m->rchan = 0;
774 if (!m->busy)
775 goto err1;
776 }
777 MIDI_DEBUG(6, printf("midi_read start\n"));
778 /*
779 * At this point, it is certain that m->inq has data
780 */
781
782 used = MIN(MIDIQ_LEN(m->inq), uio->uio_resid);
783 used = MIN(used, MIDI_RSIZE);
784
785 MIDI_DEBUG(6, printf("midiread: uiomove cc=%d\n", used));
786 MIDIQ_DEQ(m->inq, buf, used);
787 retval = uiomove(buf, used, uio);
788 if (retval)
789 goto err1;
790 }
791
792 /*
793 * If we Made it here then transfer is good
794 */
795 retval = 0;
796 err1: mtx_unlock(&m->qlock);
797 mtx_unlock(&m->lock);
798 err0: MIDI_DEBUG(4, printf("midi_read: ret %d\n", retval));
799 return retval;
800 }
801
802 /*
803 * midi_write: The only setter of M_TXEN
804 */
805
806 int
807 midi_write(struct cdev *i_dev, struct uio *uio, int ioflag)
808 {
809 #define MIDI_WSIZE 32
810 struct snd_midi *m = i_dev->si_drv1;
811 int retval;
812 int used;
813 char buf[MIDI_WSIZE];
814
815
816 MIDI_DEBUG(4, printf("midi_write\n"));
817 retval = 0;
818 if (m == NULL)
819 goto err0;
820
821 mtx_lock(&m->lock);
822 mtx_lock(&m->qlock);
823
824 if (!(m->flags & M_TX))
825 goto err1;
826
827 while (uio->uio_resid > 0) {
828 while (MIDIQ_AVAIL(m->outq) == 0) {
829 retval = EWOULDBLOCK;
830 if (ioflag & O_NONBLOCK)
831 goto err1;
832 mtx_unlock(&m->lock);
833 m->wchan = 1;
834 MIDI_DEBUG(3, printf("midi_write msleep\n"));
835 retval = msleep(&m->wchan, &m->qlock,
836 PCATCH | PDROP, "midi TX", 0);
837 /*
838 * We slept, maybe things have changed since last
839 * dying check
840 */
841 if (retval == EINTR)
842 goto err0;
843 if (m != i_dev->si_drv1)
844 retval = ENXIO;
845 if (retval)
846 goto err0;
847 mtx_lock(&m->lock);
848 mtx_lock(&m->qlock);
849 m->wchan = 0;
850 if (!m->busy)
851 goto err1;
852 }
853
854 /*
855 * We are certain than data can be placed on the queue
856 */
857
858 used = MIN(MIDIQ_AVAIL(m->outq), uio->uio_resid);
859 used = MIN(used, MIDI_WSIZE);
860 MIDI_DEBUG(5, printf("midiout: resid %zd len %jd avail %jd\n",
861 uio->uio_resid, (intmax_t)MIDIQ_LEN(m->outq),
862 (intmax_t)MIDIQ_AVAIL(m->outq)));
863
864
865 MIDI_DEBUG(5, printf("midi_write: uiomove cc=%d\n", used));
866 retval = uiomove(buf, used, uio);
867 if (retval)
868 goto err1;
869 MIDIQ_ENQ(m->outq, buf, used);
870 /*
871 * Inform the bottom half that data can be written
872 */
873 if (!(m->flags & M_TXEN)) {
874 m->flags |= M_TXEN;
875 MPU_CALLBACK(m, m->cookie, m->flags);
876 }
877 }
878 /*
879 * If we Made it here then transfer is good
880 */
881 retval = 0;
882 err1: mtx_unlock(&m->qlock);
883 mtx_unlock(&m->lock);
884 err0: return retval;
885 }
886
887 int
888 midi_ioctl(struct cdev *i_dev, u_long cmd, caddr_t arg, int mode,
889 struct thread *td)
890 {
891 return ENXIO;
892 }
893
894 int
895 midi_poll(struct cdev *i_dev, int events, struct thread *td)
896 {
897 struct snd_midi *m = i_dev->si_drv1;
898 int revents;
899
900 if (m == NULL)
901 return 0;
902
903 revents = 0;
904
905 mtx_lock(&m->lock);
906 mtx_lock(&m->qlock);
907
908 if (events & (POLLIN | POLLRDNORM))
909 if (!MIDIQ_EMPTY(m->inq))
910 events |= events & (POLLIN | POLLRDNORM);
911
912 if (events & (POLLOUT | POLLWRNORM))
913 if (MIDIQ_AVAIL(m->outq) < m->hiwat)
914 events |= events & (POLLOUT | POLLWRNORM);
915
916 if (revents == 0) {
917 if (events & (POLLIN | POLLRDNORM))
918 selrecord(td, &m->rsel);
919
920 if (events & (POLLOUT | POLLWRNORM))
921 selrecord(td, &m->wsel);
922 }
923 mtx_unlock(&m->lock);
924 mtx_unlock(&m->qlock);
925
926 return (revents);
927 }
928
929 /*
930 * /dev/midistat device functions
931 *
932 */
933 static int
934 midistat_open(struct cdev *i_dev, int flags, int mode, struct thread *td)
935 {
936 int error;
937
938 MIDI_DEBUG(1, printf("midistat_open\n"));
939 mtx_lock(&midistat_lock);
940
941 if (midistat_isopen) {
942 mtx_unlock(&midistat_lock);
943 return EBUSY;
944 }
945 midistat_isopen = 1;
946 mtx_unlock(&midistat_lock);
947
948 if (sbuf_new(&midistat_sbuf, NULL, 4096, SBUF_AUTOEXTEND) == NULL) {
949 error = ENXIO;
950 mtx_lock(&midistat_lock);
951 goto out;
952 }
953 mtx_lock(&midistat_lock);
954 midistat_bufptr = 0;
955 error = (midistat_prepare(&midistat_sbuf) > 0) ? 0 : ENOMEM;
956
957 out: if (error)
958 midistat_isopen = 0;
959 mtx_unlock(&midistat_lock);
960 return error;
961 }
962
963 static int
964 midistat_close(struct cdev *i_dev, int flags, int mode, struct thread *td)
965 {
966 MIDI_DEBUG(1, printf("midistat_close\n"));
967 mtx_lock(&midistat_lock);
968 if (!midistat_isopen) {
969 mtx_unlock(&midistat_lock);
970 return EBADF;
971 }
972 sbuf_delete(&midistat_sbuf);
973 midistat_isopen = 0;
974
975 mtx_unlock(&midistat_lock);
976 return 0;
977 }
978
979 static int
980 midistat_read(struct cdev *i_dev, struct uio *buf, int flag)
981 {
982 int l, err;
983
984 MIDI_DEBUG(4, printf("midistat_read\n"));
985 mtx_lock(&midistat_lock);
986 if (!midistat_isopen) {
987 mtx_unlock(&midistat_lock);
988 return EBADF;
989 }
990 l = min(buf->uio_resid, sbuf_len(&midistat_sbuf) - midistat_bufptr);
991 err = 0;
992 if (l > 0) {
993 mtx_unlock(&midistat_lock);
994 err = uiomove(sbuf_data(&midistat_sbuf) + midistat_bufptr, l,
995 buf);
996 mtx_lock(&midistat_lock);
997 } else
998 l = 0;
999 midistat_bufptr += l;
1000 mtx_unlock(&midistat_lock);
1001 return err;
1002 }
1003
1004 /*
1005 * Module library functions
1006 */
1007
1008 static int
1009 midistat_prepare(struct sbuf *s)
1010 {
1011 struct snd_midi *m;
1012
1013 mtx_assert(&midistat_lock, MA_OWNED);
1014
1015 sbuf_printf(s, "FreeBSD Midi Driver (midi2)\n");
1016 if (TAILQ_EMPTY(&midi_devs)) {
1017 sbuf_printf(s, "No devices installed.\n");
1018 sbuf_finish(s);
1019 return sbuf_len(s);
1020 }
1021 sbuf_printf(s, "Installed devices:\n");
1022
1023 TAILQ_FOREACH(m, &midi_devs, link) {
1024 mtx_lock(&m->lock);
1025 sbuf_printf(s, "%s [%d/%d:%s]", m->name, m->unit, m->channel,
1026 MPU_PROVIDER(m, m->cookie));
1027 sbuf_printf(s, "%s", MPU_DESCR(m, m->cookie, midistat_verbose));
1028 sbuf_printf(s, "\n");
1029 mtx_unlock(&m->lock);
1030 }
1031
1032 sbuf_finish(s);
1033 return sbuf_len(s);
1034 }
1035
1036 #ifdef notdef
1037 /*
1038 * Convert IOCTL command to string for debugging
1039 */
1040
1041 static char *
1042 midi_cmdname(int cmd)
1043 {
1044 static struct {
1045 int cmd;
1046 char *name;
1047 } *tab, cmdtab_midiioctl[] = {
1048 #define A(x) {x, ## x}
1049 /*
1050 * Once we have some real IOCTLs define, the following will
1051 * be relavant.
1052 *
1053 * A(SNDCTL_MIDI_PRETIME), A(SNDCTL_MIDI_MPUMODE),
1054 * A(SNDCTL_MIDI_MPUCMD), A(SNDCTL_SYNTH_INFO),
1055 * A(SNDCTL_MIDI_INFO), A(SNDCTL_SYNTH_MEMAVL),
1056 * A(SNDCTL_FM_LOAD_INSTR), A(SNDCTL_FM_4OP_ENABLE),
1057 * A(MIOSPASSTHRU), A(MIOGPASSTHRU), A(AIONWRITE),
1058 * A(AIOGSIZE), A(AIOSSIZE), A(AIOGFMT), A(AIOSFMT),
1059 * A(AIOGMIX), A(AIOSMIX), A(AIOSTOP), A(AIOSYNC),
1060 * A(AIOGCAP),
1061 */
1062 #undef A
1063 {
1064 -1, "unknown"
1065 },
1066 };
1067
1068 for (tab = cmdtab_midiioctl; tab->cmd != cmd && tab->cmd != -1; tab++);
1069 return tab->name;
1070 }
1071
1072 #endif /* notdef */
1073
1074 /*
1075 * midisynth
1076 */
1077
1078
1079 int
1080 midisynth_open(void *n, void *arg, int flags)
1081 {
1082 struct snd_midi *m = ((struct synth_midi *)n)->m;
1083 int retval;
1084
1085 MIDI_DEBUG(1, printf("midisynth_open %s %s\n",
1086 flags & FREAD ? "M_RX" : "", flags & FWRITE ? "M_TX" : ""));
1087
1088 if (m == NULL)
1089 return ENXIO;
1090
1091 mtx_lock(&m->lock);
1092 mtx_lock(&m->qlock);
1093
1094 retval = 0;
1095
1096 if (flags & FREAD) {
1097 if (MIDIQ_SIZE(m->inq) == 0)
1098 retval = ENXIO;
1099 else if (m->flags & M_RX)
1100 retval = EBUSY;
1101 if (retval)
1102 goto err;
1103 }
1104 if (flags & FWRITE) {
1105 if (MIDIQ_SIZE(m->outq) == 0)
1106 retval = ENXIO;
1107 else if (m->flags & M_TX)
1108 retval = EBUSY;
1109 if (retval)
1110 goto err;
1111 }
1112 m->busy++;
1113
1114 /*
1115 * TODO: Consider m->async = 0;
1116 */
1117
1118 if (flags & FREAD) {
1119 m->flags |= M_RX | M_RXEN;
1120 /*
1121 * Only clear the inq, the outq might still have data to drain
1122 * from a previous session
1123 */
1124 MIDIQ_CLEAR(m->inq);
1125 m->rchan = 0;
1126 };
1127
1128 if (flags & FWRITE) {
1129 m->flags |= M_TX;
1130 m->wchan = 0;
1131 }
1132 m->synth_flags = flags & (FREAD | FWRITE);
1133
1134 MPU_CALLBACK(m, m->cookie, m->flags);
1135
1136
1137 err: mtx_unlock(&m->qlock);
1138 mtx_unlock(&m->lock);
1139 MIDI_DEBUG(2, printf("midisynth_open: return %d.\n", retval));
1140 return retval;
1141 }
1142
1143 int
1144 midisynth_close(void *n)
1145 {
1146 struct snd_midi *m = ((struct synth_midi *)n)->m;
1147 int retval;
1148 int oldflags;
1149
1150 MIDI_DEBUG(1, printf("midisynth_close %s %s\n",
1151 m->synth_flags & FREAD ? "M_RX" : "",
1152 m->synth_flags & FWRITE ? "M_TX" : ""));
1153
1154 if (m == NULL)
1155 return ENXIO;
1156
1157 mtx_lock(&m->lock);
1158 mtx_lock(&m->qlock);
1159
1160 if ((m->synth_flags & FREAD && !(m->flags & M_RX)) ||
1161 (m->synth_flags & FWRITE && !(m->flags & M_TX))) {
1162 retval = ENXIO;
1163 goto err;
1164 }
1165 m->busy--;
1166
1167 oldflags = m->flags;
1168
1169 if (m->synth_flags & FREAD)
1170 m->flags &= ~(M_RX | M_RXEN);
1171 if (m->synth_flags & FWRITE)
1172 m->flags &= ~M_TX;
1173
1174 if ((m->flags & (M_TXEN | M_RXEN)) != (oldflags & (M_RXEN | M_TXEN)))
1175 MPU_CALLBACK(m, m->cookie, m->flags);
1176
1177 MIDI_DEBUG(1, printf("midi_close: closed, busy = %d.\n", m->busy));
1178
1179 mtx_unlock(&m->qlock);
1180 mtx_unlock(&m->lock);
1181 retval = 0;
1182 err: return retval;
1183 }
1184
1185 /*
1186 * Always blocking.
1187 */
1188
1189 int
1190 midisynth_writeraw(void *n, uint8_t *buf, size_t len)
1191 {
1192 struct snd_midi *m = ((struct synth_midi *)n)->m;
1193 int retval;
1194 int used;
1195 int i;
1196
1197 MIDI_DEBUG(4, printf("midisynth_writeraw\n"));
1198
1199 retval = 0;
1200
1201 if (m == NULL)
1202 return ENXIO;
1203
1204 mtx_lock(&m->lock);
1205 mtx_lock(&m->qlock);
1206
1207 if (!(m->flags & M_TX))
1208 goto err1;
1209
1210 if (midi_dumpraw)
1211 printf("midi dump: ");
1212
1213 while (len > 0) {
1214 while (MIDIQ_AVAIL(m->outq) == 0) {
1215 if (!(m->flags & M_TXEN)) {
1216 m->flags |= M_TXEN;
1217 MPU_CALLBACK(m, m->cookie, m->flags);
1218 }
1219 mtx_unlock(&m->lock);
1220 m->wchan = 1;
1221 MIDI_DEBUG(3, printf("midisynth_writeraw msleep\n"));
1222 retval = msleep(&m->wchan, &m->qlock,
1223 PCATCH | PDROP, "midi TX", 0);
1224 /*
1225 * We slept, maybe things have changed since last
1226 * dying check
1227 */
1228 if (retval == EINTR)
1229 goto err0;
1230
1231 if (retval)
1232 goto err0;
1233 mtx_lock(&m->lock);
1234 mtx_lock(&m->qlock);
1235 m->wchan = 0;
1236 if (!m->busy)
1237 goto err1;
1238 }
1239
1240 /*
1241 * We are certain than data can be placed on the queue
1242 */
1243
1244 used = MIN(MIDIQ_AVAIL(m->outq), len);
1245 used = MIN(used, MIDI_WSIZE);
1246 MIDI_DEBUG(5,
1247 printf("midi_synth: resid %zu len %jd avail %jd\n",
1248 len, (intmax_t)MIDIQ_LEN(m->outq),
1249 (intmax_t)MIDIQ_AVAIL(m->outq)));
1250
1251 if (midi_dumpraw)
1252 for (i = 0; i < used; i++)
1253 printf("%x ", buf[i]);
1254
1255 MIDIQ_ENQ(m->outq, buf, used);
1256 len -= used;
1257
1258 /*
1259 * Inform the bottom half that data can be written
1260 */
1261 if (!(m->flags & M_TXEN)) {
1262 m->flags |= M_TXEN;
1263 MPU_CALLBACK(m, m->cookie, m->flags);
1264 }
1265 }
1266 /*
1267 * If we Made it here then transfer is good
1268 */
1269 if (midi_dumpraw)
1270 printf("\n");
1271
1272 retval = 0;
1273 err1: mtx_unlock(&m->qlock);
1274 mtx_unlock(&m->lock);
1275 err0: return retval;
1276 }
1277
1278 static int
1279 midisynth_killnote(void *n, uint8_t chn, uint8_t note, uint8_t vel)
1280 {
1281 u_char c[3];
1282
1283
1284 if (note > 127 || chn > 15)
1285 return (EINVAL);
1286
1287 if (vel > 127)
1288 vel = 127;
1289
1290 if (vel == 64) {
1291 c[0] = 0x90 | (chn & 0x0f); /* Note on. */
1292 c[1] = (u_char)note;
1293 c[2] = 0;
1294 } else {
1295 c[0] = 0x80 | (chn & 0x0f); /* Note off. */
1296 c[1] = (u_char)note;
1297 c[2] = (u_char)vel;
1298 }
1299
1300 return midisynth_writeraw(n, c, 3);
1301 }
1302
1303 static int
1304 midisynth_setinstr(void *n, uint8_t chn, uint16_t instr)
1305 {
1306 u_char c[2];
1307
1308 if (instr > 127 || chn > 15)
1309 return EINVAL;
1310
1311 c[0] = 0xc0 | (chn & 0x0f); /* Progamme change. */
1312 c[1] = instr + midi_instroff;
1313
1314 return midisynth_writeraw(n, c, 2);
1315 }
1316
1317 static int
1318 midisynth_startnote(void *n, uint8_t chn, uint8_t note, uint8_t vel)
1319 {
1320 u_char c[3];
1321
1322 if (note > 127 || chn > 15)
1323 return EINVAL;
1324
1325 if (vel > 127)
1326 vel = 127;
1327
1328 c[0] = 0x90 | (chn & 0x0f); /* Note on. */
1329 c[1] = (u_char)note;
1330 c[2] = (u_char)vel;
1331
1332 return midisynth_writeraw(n, c, 3);
1333 }
1334 static int
1335 midisynth_alloc(void *n, uint8_t chan, uint8_t note)
1336 {
1337 return chan;
1338 }
1339
1340 static int
1341 midisynth_controller(void *n, uint8_t chn, uint8_t ctrlnum, uint16_t val)
1342 {
1343 u_char c[3];
1344
1345 if (ctrlnum > 127 || chn > 15)
1346 return EINVAL;
1347
1348 c[0] = 0xb0 | (chn & 0x0f); /* Control Message. */
1349 c[1] = ctrlnum;
1350 c[2] = val;
1351 return midisynth_writeraw(n, c, 3);
1352 }
1353
1354 static int
1355 midisynth_bender(void *n, uint8_t chn, uint16_t val)
1356 {
1357 u_char c[3];
1358
1359
1360 if (val > 16383 || chn > 15)
1361 return EINVAL;
1362
1363 c[0] = 0xe0 | (chn & 0x0f); /* Pitch bend. */
1364 c[1] = (u_char)val & 0x7f;
1365 c[2] = (u_char)(val >> 7) & 0x7f;
1366
1367 return midisynth_writeraw(n, c, 3);
1368 }
1369
1370 /*
1371 * Single point of midi destructions.
1372 */
1373 static int
1374 midi_destroy(struct snd_midi *m, int midiuninit)
1375 {
1376
1377 mtx_assert(&midistat_lock, MA_OWNED);
1378 mtx_assert(&m->lock, MA_OWNED);
1379
1380 MIDI_DEBUG(3, printf("midi_destroy\n"));
1381 m->dev->si_drv1 = NULL;
1382 mtx_unlock(&m->lock); /* XXX */
1383 destroy_dev(m->dev);
1384 TAILQ_REMOVE(&midi_devs, m, link);
1385 if (midiuninit)
1386 MPU_UNINIT(m, m->cookie);
1387 free(MIDIQ_BUF(m->inq), M_MIDI);
1388 free(MIDIQ_BUF(m->outq), M_MIDI);
1389 mtx_destroy(&m->qlock);
1390 mtx_destroy(&m->lock);
1391 free(m, M_MIDI);
1392 return 0;
1393 }
1394
1395 /*
1396 * Load and unload functions, creates the /dev/midistat device
1397 */
1398
1399 static int
1400 midi_load(void)
1401 {
1402 mtx_init(&midistat_lock, "midistat lock", NULL, 0);
1403 TAILQ_INIT(&midi_devs); /* Initialize the queue. */
1404
1405 midistat_dev = make_dev(&midistat_cdevsw,
1406 MIDIMKMINOR(0, MIDI_DEV_MIDICTL, 0),
1407 UID_ROOT, GID_WHEEL, 0666, "midistat");
1408
1409 return 0;
1410 }
1411
1412 static int
1413 midi_unload(void)
1414 {
1415 struct snd_midi *m, *tmp;
1416 int retval;
1417
1418 MIDI_DEBUG(1, printf("midi_unload()\n"));
1419 retval = EBUSY;
1420 mtx_lock(&midistat_lock);
1421 if (midistat_isopen)
1422 goto exit0;
1423
1424 TAILQ_FOREACH_SAFE(m, &midi_devs, link, tmp) {
1425 mtx_lock(&m->lock);
1426 if (m->busy)
1427 retval = EBUSY;
1428 else
1429 retval = midi_destroy(m, 1);
1430 if (retval)
1431 goto exit1;
1432 }
1433
1434 mtx_unlock(&midistat_lock); /* XXX */
1435
1436 destroy_dev(midistat_dev);
1437 /*
1438 * Made it here then unload is complete
1439 */
1440 mtx_destroy(&midistat_lock);
1441 return 0;
1442
1443 exit1:
1444 mtx_unlock(&m->lock);
1445 exit0:
1446 mtx_unlock(&midistat_lock);
1447 if (retval)
1448 MIDI_DEBUG(2, printf("midi_unload: failed\n"));
1449 return retval;
1450 }
1451
1452 extern int seq_modevent(module_t mod, int type, void *data);
1453
1454 static int
1455 midi_modevent(module_t mod, int type, void *data)
1456 {
1457 int retval;
1458
1459 retval = 0;
1460
1461 switch (type) {
1462 case MOD_LOAD:
1463 retval = midi_load();
1464 #if 0
1465 if (retval == 0)
1466 retval = seq_modevent(mod, type, data);
1467 #endif
1468 break;
1469
1470 case MOD_UNLOAD:
1471 retval = midi_unload();
1472 #if 0
1473 if (retval == 0)
1474 retval = seq_modevent(mod, type, data);
1475 #endif
1476 break;
1477
1478 default:
1479 break;
1480 }
1481
1482 return retval;
1483 }
1484
1485 kobj_t
1486 midimapper_addseq(void *arg1, int *unit, void **cookie)
1487 {
1488 unit = 0;
1489
1490 return (kobj_t)arg1;
1491 }
1492
1493 int
1494 midimapper_open(void *arg1, void **cookie)
1495 {
1496 int retval = 0;
1497 struct snd_midi *m;
1498
1499 mtx_lock(&midistat_lock);
1500
1501 TAILQ_FOREACH(m, &midi_devs, link) {
1502 retval++;
1503 }
1504
1505 mtx_unlock(&midistat_lock);
1506 return retval;
1507 }
1508
1509 int
1510 midimapper_close(void *arg1, void *cookie)
1511 {
1512 return 0;
1513 }
1514
1515 kobj_t
1516 midimapper_fetch_synth(void *arg, void *cookie, int unit)
1517 {
1518 struct snd_midi *m;
1519 int retval = 0;
1520
1521 mtx_lock(&midistat_lock);
1522
1523 TAILQ_FOREACH(m, &midi_devs, link) {
1524 if (unit == retval) {
1525 mtx_unlock(&midistat_lock);
1526 return (kobj_t)m->synth;
1527 }
1528 retval++;
1529 }
1530
1531 mtx_unlock(&midistat_lock);
1532 return NULL;
1533 }
1534
1535 DEV_MODULE(midi, midi_modevent, NULL);
1536 MODULE_VERSION(midi, 1);
Cache object: d5c9c0ba043c288f5af4b6d9153dc739
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