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midi.c revision 1.21.6.3 
      1 /*	$NetBSD: midi.c,v 1.21.6.3 2001/10/11 00:02:01 fvdl Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Lennart Augustsson (augustss (at) netbsd.org).
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include "midi.h"
     40 #include "sequencer.h"
     41 
     42 #include <sys/param.h>
     43 #include <sys/ioctl.h>
     44 #include <sys/fcntl.h>
     45 #include <sys/vnode.h>
     46 #include <sys/select.h>
     47 #include <sys/poll.h>
     48 #include <sys/malloc.h>
     49 #include <sys/proc.h>
     50 #include <sys/systm.h>
     51 #include <sys/callout.h>
     52 #include <sys/syslog.h>
     53 #include <sys/kernel.h>
     54 #include <sys/signalvar.h>
     55 #include <sys/conf.h>
     56 #include <sys/audioio.h>
     57 #include <sys/midiio.h>
     58 #include <sys/device.h>
     59 #include <sys/vnode.h>
     60 
     61 #include <miscfs/specfs/specdev.h>
     62 
     63 #include <dev/audio_if.h>
     64 #include <dev/midi_if.h>
     65 #include <dev/midivar.h>
     66 
     67 #if NMIDI > 0
     68 
     69 #ifdef AUDIO_DEBUG
     70 #define DPRINTF(x)	if (mididebug) printf x
     71 #define DPRINTFN(n,x)	if (mididebug >= (n)) printf x
     72 int	mididebug = 0;
     73 #else
     74 #define DPRINTF(x)
     75 #define DPRINTFN(n,x)
     76 #endif
     77 
     78 int midi_wait;
     79 
     80 void	midi_in(void *, int);
     81 void	midi_out(void *);
     82 int	midi_start_output(struct midi_softc *, int);
     83 int	midi_sleep_timo(int *, char *, int);
     84 int	midi_sleep(int *, char *);
     85 void	midi_wakeup(int *);
     86 void	midi_initbuf(struct midi_buffer *);
     87 void	midi_timeout(void *);
     88 
     89 int	midiprobe(struct device *, struct cfdata *, void *);
     90 void	midiattach(struct device *, struct device *, void *);
     91 int	mididetach(struct device *, int);
     92 int	midiactivate(struct device *, enum devact);
     93 
     94 struct cfattach midi_ca = {
     95 	sizeof(struct midi_softc), midiprobe, midiattach,
     96 	mididetach, midiactivate
     97 };
     98 
     99 #ifdef MIDI_SAVE
    100 #define MIDI_SAVE_SIZE 100000
    101 int midicnt;
    102 struct {
    103 	int cnt;
    104 	u_char buf[MIDI_SAVE_SIZE];
    105 } midisave;
    106 #define MIDI_GETSAVE		_IOWR('m', 100, int)
    107 
    108 #endif
    109 
    110 extern struct cfdriver midi_cd;
    111 
    112 int
    113 midiprobe(struct device *parent, struct cfdata *match, void *aux)
    114 {
    115 	struct audio_attach_args *sa = aux;
    116 
    117 	DPRINTFN(6,("midiprobe: type=%d sa=%p hw=%p\n",
    118 		 sa->type, sa, sa->hwif));
    119 	return (sa->type == AUDIODEV_TYPE_MIDI);
    120 }
    121 
    122 void
    123 midiattach(struct device *parent, struct device *self, void *aux)
    124 {
    125 	struct midi_softc *sc = (void *)self;
    126 	struct audio_attach_args *sa = aux;
    127 	struct midi_hw_if *hwp = sa->hwif;
    128 	void *hdlp = sa->hdl;
    129 
    130 	DPRINTFN(6, ("MIDI attach\n"));
    131 
    132 #ifdef DIAGNOSTIC
    133 	if (hwp == 0 ||
    134 	    hwp->open == 0 ||
    135 	    hwp->close == 0 ||
    136 	    hwp->output == 0 ||
    137 	    hwp->getinfo == 0) {
    138 		printf("midi: missing method\n");
    139 		return;
    140 	}
    141 #endif
    142 
    143 	callout_init(&sc->sc_callout);
    144 
    145 	sc->hw_if = hwp;
    146 	sc->hw_hdl = hdlp;
    147 	sc->dying = 0;
    148 	midi_attach(sc, parent);
    149 }
    150 
    151 int
    152 midiactivate(struct device *self, enum devact act)
    153 {
    154 	struct midi_softc *sc = (struct midi_softc *)self;
    155 
    156 	switch (act) {
    157 	case DVACT_ACTIVATE:
    158 		return (EOPNOTSUPP);
    159 		break;
    160 
    161 	case DVACT_DEACTIVATE:
    162 		sc->dying = 1;
    163 		break;
    164 	}
    165 	return (0);
    166 }
    167 
    168 int
    169 mididetach(struct device *self, int flags)
    170 {
    171 	struct midi_softc *sc = (struct midi_softc *)self;
    172 	int maj, mn;
    173 
    174 	DPRINTF(("midi_detach: sc=%p flags=%d\n", sc, flags));
    175 
    176 	sc->dying = 1;
    177 
    178 	wakeup(&sc->wchan);
    179 	wakeup(&sc->rchan);
    180 
    181 	/* locate the major number */
    182 	for (maj = 0; maj < nchrdev; maj++)
    183 		if (cdevsw[maj].d_open == midiopen)
    184 			break;
    185 
    186 	/* Nuke the vnodes for any open instances (calls close). */
    187 	mn = self->dv_unit;
    188 	vdevgone(maj, mn, mn, VCHR);
    189 
    190 	return (0);
    191 }
    192 
    193 void
    194 midi_attach(struct midi_softc *sc, struct device *parent)
    195 {
    196 	struct midi_info mi;
    197 
    198 	sc->isopen = 0;
    199 
    200 	midi_wait = MIDI_WAIT * hz / 1000000;
    201 	if (midi_wait == 0)
    202 		midi_wait = 1;
    203 
    204 	sc->sc_dev = parent;
    205 	sc->hw_if->getinfo(sc->hw_hdl, &mi);
    206 	sc->props = mi.props;
    207 	printf(": %s\n", mi.name);
    208 }
    209 
    210 int
    211 midi_unit_count(void)
    212 {
    213 	return midi_cd.cd_ndevs;
    214 }
    215 
    216 void
    217 midi_initbuf(struct midi_buffer *mb)
    218 {
    219 	mb->used = 0;
    220 	mb->usedhigh = MIDI_BUFSIZE;
    221 	mb->end = mb->start + mb->usedhigh;
    222 	mb->inp = mb->outp = mb->start;
    223 }
    224 
    225 int
    226 midi_sleep_timo(int *chan, char *label, int timo)
    227 {
    228 	int st;
    229 
    230 	if (!label)
    231 		label = "midi";
    232 
    233 	DPRINTFN(5, ("midi_sleep_timo: %p %s %d\n", chan, label, timo));
    234 	*chan = 1;
    235 	st = tsleep(chan, PWAIT | PCATCH, label, timo);
    236 	*chan = 0;
    237 #ifdef MIDI_DEBUG
    238 	if (st != 0)
    239 		printf("midi_sleep: %d\n", st);
    240 #endif
    241 	return st;
    242 }
    243 
    244 int
    245 midi_sleep(int *chan, char *label)
    246 {
    247 	return midi_sleep_timo(chan, label, 0);
    248 }
    249 
    250 void
    251 midi_wakeup(int *chan)
    252 {
    253 	if (*chan) {
    254 		DPRINTFN(5, ("midi_wakeup: %p\n", chan));
    255 		wakeup(chan);
    256 		*chan = 0;
    257 	}
    258 }
    259 
    260 static int midi_lengths[] = { 2,2,2,2,1,1,2,0 };
    261 /* Number of bytes in a MIDI command */
    262 #define MIDI_LENGTH(d) (midi_lengths[((d) >> 4) & 7])
    263 
    264 void
    265 midi_in(void *addr, int data)
    266 {
    267 	struct midi_softc *sc = addr;
    268 	struct midi_buffer *mb = &sc->inbuf;
    269 	int i;
    270 
    271 	if (!sc->isopen)
    272 		return;
    273 	if (data == MIDI_ACK)
    274 		return;
    275 
    276 	DPRINTFN(3, ("midi_in: sc=%p data=0x%02x state=%d pos=%d\n",
    277 		     sc, data, sc->in_state, sc->in_pos));
    278 
    279 	if (!(sc->flags & FREAD))
    280 		return;		/* discard data if not reading */
    281 
    282 	switch(sc->in_state) {
    283 	case MIDI_IN_START:
    284 		if (MIDI_IS_STATUS(data)) {
    285 			switch(data) {
    286 			case 0xf0: /* Sysex */
    287 				sc->in_state = MIDI_IN_SYSEX;
    288 				break;
    289 			case 0xf1: /* MTC quarter frame */
    290 			case 0xf3: /* Song select */
    291 				sc->in_state = MIDI_IN_DATA;
    292 				sc->in_msg[0] = data;
    293 				sc->in_pos = 1;
    294 				sc->in_left = 1;
    295 				break;
    296 			case 0xf2: /* Song position pointer */
    297 				sc->in_state = MIDI_IN_DATA;
    298 				sc->in_msg[0] = data;
    299 				sc->in_pos = 1;
    300 				sc->in_left = 2;
    301 				break;
    302 			default:
    303 				if (MIDI_IS_COMMON(data)) {
    304 					sc->in_msg[0] = data;
    305 					sc->in_pos = 1;
    306 					goto deliver;
    307 				} else {
    308 					sc->in_state = MIDI_IN_DATA;
    309 					sc->in_msg[0] = sc->in_status = data;
    310 					sc->in_pos = 1;
    311 					sc->in_left = MIDI_LENGTH(data);
    312 				}
    313 				break;
    314 			}
    315 		} else {
    316 			if (MIDI_IS_STATUS(sc->in_status)) {
    317 				sc->in_state = MIDI_IN_DATA;
    318 				sc->in_msg[0] = sc->in_status;
    319 				sc->in_msg[1] = data;
    320 				sc->in_pos = 2;
    321 				sc->in_left = MIDI_LENGTH(sc->in_status) - 1;
    322 			}
    323 		}
    324 		return;
    325 	case MIDI_IN_DATA:
    326 		sc->in_msg[sc->in_pos++] = data;
    327 		if (--sc->in_left <= 0)
    328 			break;	/* deliver data */
    329 		return;
    330 	case MIDI_IN_SYSEX:
    331 		if (data == MIDI_SYSEX_END)
    332 			sc->in_state = MIDI_IN_START;
    333 		return;
    334 	}
    335 deliver:
    336 	sc->in_state = MIDI_IN_START;
    337 #if NSEQUENCER > 0
    338 	if (sc->seqopen) {
    339 		extern void midiseq_in(struct midi_dev *,u_char *,int);
    340 		midiseq_in(sc->seq_md, sc->in_msg, sc->in_pos);
    341 		return;
    342 	}
    343 #endif
    344 
    345 	if (mb->used + sc->in_pos > mb->usedhigh) {
    346 		DPRINTF(("midi_in: buffer full, discard data=0x%02x\n",
    347 			 sc->in_msg[0]));
    348 		return;
    349 	}
    350 	for (i = 0; i < sc->in_pos; i++) {
    351 		*mb->inp++ = sc->in_msg[i];
    352 		if (mb->inp >= mb->end)
    353 			mb->inp = mb->start;
    354 		mb->used++;
    355 	}
    356 	midi_wakeup(&sc->rchan);
    357 	selwakeup(&sc->rsel);
    358 	if (sc->async)
    359 		psignal(sc->async, SIGIO);
    360 }
    361 
    362 void
    363 midi_out(void *addr)
    364 {
    365 	struct midi_softc *sc = addr;
    366 
    367 	if (!sc->isopen)
    368 		return;
    369 	DPRINTFN(3, ("midi_out: %p\n", sc));
    370 	midi_start_output(sc, 1);
    371 }
    372 
    373 int
    374 midiopen(struct vnode *devvp, int flags, int ifmt, struct proc *p)
    375 {
    376 	struct midi_softc *sc;
    377 	struct midi_hw_if *hw;
    378 	int error;
    379 
    380 	sc = device_lookup(&midi_cd, MIDIUNIT(vdev_rdev(devvp)));
    381 	if (sc == NULL)
    382 		return (ENXIO);
    383 	if (sc->dying)
    384 		return (EIO);
    385 
    386 	vdev_setprivdata(devvp, sc);
    387 
    388 	DPRINTF(("midiopen %p\n", sc));
    389 
    390 	hw = sc->hw_if;
    391 	if (!hw)
    392 		return ENXIO;
    393 	if (sc->isopen)
    394 		return EBUSY;
    395 	sc->in_state = MIDI_IN_START;
    396 	sc->in_status = 0;
    397 	error = hw->open(sc->hw_hdl, flags, midi_in, midi_out, sc);
    398 	if (error)
    399 		return error;
    400 	sc->isopen++;
    401 	midi_initbuf(&sc->outbuf);
    402 	midi_initbuf(&sc->inbuf);
    403 	sc->flags = flags;
    404 	sc->rchan = 0;
    405 	sc->wchan = 0;
    406 	sc->pbus = 0;
    407 	sc->async = 0;
    408 
    409 #ifdef MIDI_SAVE
    410 	if (midicnt != 0) {
    411 		midisave.cnt = midicnt;
    412 		midicnt = 0;
    413 	}
    414 #endif
    415 
    416 	return 0;
    417 }
    418 
    419 int
    420 midiclose(struct vnode *devvp, int flags, int ifmt, struct proc *p)
    421 {
    422 	struct midi_softc *sc;
    423 	struct midi_hw_if *hw;
    424 	int s, error;
    425 
    426 	sc = vdev_privdata(devvp);
    427 
    428 	DPRINTF(("midiclose %p\n", sc));
    429 
    430 	midi_start_output(sc, 0);
    431 	s = splaudio();
    432 	while (sc->outbuf.used > 0 && !error) {
    433 		DPRINTFN(2,("midiclose sleep used=%d\n", sc->outbuf.used));
    434 		error = midi_sleep_timo(&sc->wchan, "mid_dr", 30*hz);
    435 	}
    436 	splx(s);
    437 	sc->isopen = 0;
    438 
    439 	hw = sc->hw_if;
    440 	hw->close(sc->hw_hdl);
    441 #if NSEQUENCER > 0
    442 	sc->seqopen = 0;
    443 	sc->seq_md = 0;
    444 #endif
    445 	return 0;
    446 }
    447 
    448 int
    449 midiread(struct vnode *devvp, struct uio *uio, int ioflag)
    450 {
    451 	struct midi_softc *sc;
    452 	struct midi_buffer *mb;
    453 	int error;
    454 	u_char *outp;
    455 	int used, cc, n, resid;
    456 	int s;
    457 
    458 	sc = vdev_privdata(devvp);
    459 
    460 	DPRINTF(("midiread: %p, count=%lu\n", sc,
    461 		 (unsigned long)uio->uio_resid));
    462 
    463 	if (sc->dying)
    464 		return EIO;
    465 
    466 	error = 0;
    467 	resid = uio->uio_resid;
    468 	mb = &sc->inbuf;
    469 	while (uio->uio_resid == resid && !error) {
    470 		s = splaudio();
    471 		while (mb->used <= 0) {
    472 			if (ioflag & IO_NDELAY) {
    473 				splx(s);
    474 				return EWOULDBLOCK;
    475 			}
    476 			error = midi_sleep(&sc->rchan, "mid rd");
    477 			if (error) {
    478 				splx(s);
    479 				return error;
    480 			}
    481 		}
    482 		used = mb->used;
    483 		outp = mb->outp;
    484 		splx(s);
    485 		if (sc->dying)
    486 			return EIO;
    487 		cc = used;	/* maximum to read */
    488 		n = mb->end - outp;
    489 		if (n < cc)
    490 			cc = n;	/* don't read beyond end of buffer */
    491 		if (uio->uio_resid < cc)
    492 			cc = uio->uio_resid; /* and no more than we want */
    493 		DPRINTFN(3, ("midiread: uiomove cc=%d\n", cc));
    494 		error = uiomove(outp, cc, uio);
    495 		if (error)
    496 			break;
    497 		used -= cc;
    498 		outp += cc;
    499 		if (outp >= mb->end)
    500 			outp = mb->start;
    501 		s = splaudio();
    502 		mb->outp = outp;
    503 		mb->used = used;
    504 		splx(s);
    505 	}
    506 	return error;
    507 }
    508 
    509 void
    510 midi_timeout(void *arg)
    511 {
    512 	struct midi_softc *sc = arg;
    513 
    514 	DPRINTFN(3,("midi_timeout: %p\n", sc));
    515 	midi_start_output(sc, 1);
    516 }
    517 
    518 int
    519 midi_start_output(struct midi_softc *sc, int intr)
    520 {
    521 	struct midi_buffer *mb = &sc->outbuf;
    522 	u_char out;
    523 	int error;
    524 	int s;
    525 	int i;
    526 
    527 	error = 0;
    528 
    529 	if (sc->dying)
    530 		return EIO;
    531 
    532 	if (sc->pbus && !intr) {
    533 		DPRINTFN(4, ("midi_start_output: busy\n"));
    534 		return 0;
    535 	}
    536 	sc->pbus = (mb->used > 0)?1:0;
    537 	for (i = 0; i < MIDI_MAX_WRITE && mb->used > 0 &&
    538 		   (!error || error==EINPROGRESS); i++) {
    539 		s = splaudio();
    540 		out = *mb->outp;
    541 		mb->outp++;
    542 		if (mb->outp >= mb->end)
    543 			mb->outp = mb->start;
    544 		mb->used--;
    545 		splx(s);
    546 #ifdef MIDI_SAVE
    547 		midisave.buf[midicnt] = out;
    548 		midicnt = (midicnt + 1) % MIDI_SAVE_SIZE;
    549 #endif
    550 		DPRINTFN(4, ("midi_start_output: %p i=%d, data=0x%02x\n",
    551 			     sc, i, out));
    552 		error = sc->hw_if->output(sc->hw_hdl, out);
    553 		if ((sc->props & MIDI_PROP_OUT_INTR) && error!=EINPROGRESS)
    554 			/* If ointr is enabled, midi_start_output()
    555 			 * normally writes only one byte,
    556 			 * except hw_if->output() returns EINPROGRESS.
    557 			 */
    558 			break;
    559 	}
    560 	midi_wakeup(&sc->wchan);
    561 	selwakeup(&sc->wsel);
    562 	if (sc->async)
    563 		psignal(sc->async, SIGIO);
    564 	if (!(sc->props & MIDI_PROP_OUT_INTR) || error==EINPROGRESS) {
    565 		if (mb->used > 0)
    566 			callout_reset(&sc->sc_callout, midi_wait,
    567 				      midi_timeout, sc);
    568 		else
    569 			sc->pbus = 0;
    570 	}
    571 	if ((sc->props & MIDI_PROP_OUT_INTR) && error==EINPROGRESS)
    572 		error = 0;
    573 
    574 	return error;
    575 }
    576 
    577 int
    578 midiwrite(struct vnode *devvp, struct uio *uio, int ioflag)
    579 {
    580 	struct midi_softc *sc;
    581 	struct midi_buffer *mb;
    582 	int error;
    583 	u_char *inp;
    584 	int used, cc, n;
    585 	int s;
    586 
    587 	sc = vdev_privdata(devvp);
    588 
    589 	DPRINTFN(2, ("midiwrite: %p, unit=%d, count=%lu\n", sc, unit,
    590 		     (unsigned long)uio->uio_resid));
    591 
    592 	if (sc->dying)
    593 		return EIO;
    594 
    595 	error = 0;
    596 	mb = &sc->outbuf;
    597 	while (uio->uio_resid > 0 && !error) {
    598 		s = splaudio();
    599 		if (mb->used >= mb->usedhigh) {
    600 			DPRINTFN(3,("midi_write: sleep used=%d hiwat=%d\n",
    601 				 mb->used, mb->usedhigh));
    602 			if (ioflag & IO_NDELAY) {
    603 				splx(s);
    604 				return EWOULDBLOCK;
    605 			}
    606 			error = midi_sleep(&sc->wchan, "mid wr");
    607 			if (error) {
    608 				splx(s);
    609 				return error;
    610 			}
    611 		}
    612 		used = mb->used;
    613 		inp = mb->inp;
    614 		splx(s);
    615 		if (sc->dying)
    616 			return EIO;
    617 		cc = mb->usedhigh - used; 	/* maximum to write */
    618 		n = mb->end - inp;
    619 		if (n < cc)
    620 			cc = n;		/* don't write beyond end of buffer */
    621 		if (uio->uio_resid < cc)
    622 			cc = uio->uio_resid; 	/* and no more than we have */
    623 		error = uiomove(inp, cc, uio);
    624 #ifdef MIDI_DEBUG
    625 		if (error)
    626 		        printf("midi_write:(1) uiomove failed %d; "
    627 			       "cc=%d inp=%p\n",
    628 			       error, cc, inp);
    629 #endif
    630 		if (error)
    631 			break;
    632 		inp = mb->inp + cc;
    633 		if (inp >= mb->end)
    634 			inp = mb->start;
    635 		s = splaudio();
    636 		mb->inp = inp;
    637 		mb->used += cc;
    638 		splx(s);
    639 		error = midi_start_output(sc, 0);
    640 	}
    641 	return error;
    642 }
    643 
    644 /*
    645  * This write routine is only called from sequencer code and expects
    646  * a write that is smaller than the MIDI buffer.
    647  */
    648 int
    649 midi_writebytes(int unit, u_char *buf, int cc)
    650 {
    651 	struct midi_softc *sc = midi_cd.cd_devs[unit];
    652 	struct midi_buffer *mb = &sc->outbuf;
    653 	int n, s;
    654 
    655 	DPRINTFN(2, ("midi_writebytes: %p, unit=%d, cc=%d\n", sc, unit, cc));
    656 	DPRINTFN(3, ("midi_writebytes: %x %x %x\n",buf[0],buf[1],buf[2]));
    657 
    658 	if (sc->dying)
    659 		return EIO;
    660 
    661 	s = splaudio();
    662 	if (mb->used + cc >= mb->usedhigh) {
    663 		splx(s);
    664 		return (EWOULDBLOCK);
    665 	}
    666 	n = mb->end - mb->inp;
    667 	if (cc < n)
    668 		n = cc;
    669 	mb->used += cc;
    670 	memcpy(mb->inp, buf, n);
    671 	mb->inp += n;
    672 	if (mb->inp >= mb->end) {
    673 		mb->inp = mb->start;
    674 		cc -= n;
    675 		if (cc > 0) {
    676 			memcpy(mb->inp, buf + n, cc);
    677 			mb->inp += cc;
    678 		}
    679 	}
    680 	splx(s);
    681 	return (midi_start_output(sc, 0));
    682 }
    683 
    684 int
    685 midiioctl(struct vnode *devvp, u_long cmd, caddr_t addr, int flag,
    686 	  struct proc *p)
    687 {
    688 	struct midi_softc *sc;
    689 	struct midi_hw_if *hw;
    690 	int error;
    691 
    692 	sc = vdev_privdata(devvp);
    693 
    694 	DPRINTF(("midiioctl: %p cmd=0x%08lx\n", sc, cmd));
    695 
    696 	if (sc->dying)
    697 		return EIO;
    698 
    699 	error = 0;
    700 	switch (cmd) {
    701 	case FIONBIO:
    702 		/* All handled in the upper FS layer. */
    703 		break;
    704 
    705 	case FIOASYNC:
    706 		if (*(int *)addr) {
    707 			if (sc->async)
    708 				return EBUSY;
    709 			sc->async = p;
    710 			DPRINTF(("midi_ioctl: FIOASYNC %p\n", p));
    711 		} else
    712 			sc->async = 0;
    713 		break;
    714 
    715 #if 0
    716 	case MIDI_PRETIME:
    717 		/* XXX OSS
    718 		 * This should set up a read timeout, but that's
    719 		 * why we have poll(), so there's nothing yet. */
    720 		error = EINVAL;
    721 		break;
    722 #endif
    723 
    724 #ifdef MIDI_SAVE
    725 	case MIDI_GETSAVE:
    726 		error = copyout(&midisave, *(void **)addr, sizeof midisave);
    727   		break;
    728 #endif
    729 
    730 	default:
    731 		hw = sc->hw_if;
    732 		if (hw->ioctl)
    733 			error = hw->ioctl(sc->hw_hdl, cmd, addr, flag, p);
    734 		else
    735 			error = EINVAL;
    736 		break;
    737 	}
    738 	return error;
    739 }
    740 
    741 int
    742 midipoll(struct vnode *devvp, int events, struct proc *p)
    743 {
    744 	struct midi_softc *sc;
    745 	int revents;
    746 	int s;
    747 
    748 	sc = vdev_privdata(devvp);
    749 
    750 	revents = 0;
    751 	s = splaudio();
    752 
    753 	DPRINTF(("midipoll: %p events=0x%x\n", sc, events));
    754 
    755 	if (sc->dying)
    756 		return EIO;
    757 
    758 	if (events & (POLLIN | POLLRDNORM))
    759 		if (sc->inbuf.used > 0)
    760 			revents |= events & (POLLIN | POLLRDNORM);
    761 
    762 	if (events & (POLLOUT | POLLWRNORM))
    763 		if (sc->outbuf.used < sc->outbuf.usedhigh)
    764 			revents |= events & (POLLOUT | POLLWRNORM);
    765 
    766 	if (revents == 0) {
    767 		if (events & (POLLIN | POLLRDNORM))
    768 			selrecord(p, &sc->rsel);
    769 
    770 		if (events & (POLLOUT | POLLWRNORM))
    771 			selrecord(p, &sc->wsel);
    772 	}
    773 
    774 	splx(s);
    775 	return revents;
    776 }
    777 
    778 void
    779 midi_getinfo(dev_t dev, struct midi_info *mi)
    780 {
    781 	struct midi_softc *sc;
    782 
    783 	sc = device_lookup(&midi_cd, MIDIUNIT(dev));
    784 	if (sc == NULL)
    785 		return;
    786 	if (sc->dying)
    787 		return;
    788 
    789 	sc->hw_if->getinfo(sc->hw_hdl, mi);
    790 }
    791 
    792 #endif /* NMIDI > 0 */
    793 
    794 #if NMIDI > 0 || NMIDIBUS > 0
    795 
    796 int	audioprint(void *, const char *);
    797 
    798 struct device *
    799 midi_attach_mi(struct midi_hw_if *mhwp, void *hdlp, struct device *dev)
    800 {
    801 	struct audio_attach_args arg;
    802 
    803 #ifdef DIAGNOSTIC
    804 	if (mhwp == NULL) {
    805 		printf("midi_attach_mi: NULL\n");
    806 		return (0);
    807 	}
    808 #endif
    809 	arg.type = AUDIODEV_TYPE_MIDI;
    810 	arg.hwif = mhwp;
    811 	arg.hdl = hdlp;
    812 	return (config_found(dev, &arg, audioprint));
    813 }
    814 
    815 #endif /* NMIDI > 0 || NMIDIBUS > 0 */
    816