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midi.c revision 1.25 
      1 /*	$NetBSD: midi.c,v 1.25 2002/09/06 13:18:43 gehenna 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 <sys/cdefs.h>
     40 __KERNEL_RCSID(0, "$NetBSD: midi.c,v 1.25 2002/09/06 13:18:43 gehenna Exp $");
     41 
     42 #include "midi.h"
     43 #include "sequencer.h"
     44 
     45 #include <sys/param.h>
     46 #include <sys/ioctl.h>
     47 #include <sys/fcntl.h>
     48 #include <sys/vnode.h>
     49 #include <sys/select.h>
     50 #include <sys/poll.h>
     51 #include <sys/malloc.h>
     52 #include <sys/proc.h>
     53 #include <sys/systm.h>
     54 #include <sys/callout.h>
     55 #include <sys/syslog.h>
     56 #include <sys/kernel.h>
     57 #include <sys/signalvar.h>
     58 #include <sys/conf.h>
     59 #include <sys/audioio.h>
     60 #include <sys/midiio.h>
     61 #include <sys/device.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 dev_type_open(midiopen);
     95 dev_type_close(midiclose);
     96 dev_type_read(midiread);
     97 dev_type_write(midiwrite);
     98 dev_type_ioctl(midiioctl);
     99 dev_type_poll(midipoll);
    100 
    101 const struct cdevsw midi_cdevsw = {
    102 	midiopen, midiclose, midiread, midiwrite, midiioctl,
    103 	nostop, notty, midipoll, nommap,
    104 };
    105 
    106 struct cfattach midi_ca = {
    107 	sizeof(struct midi_softc), midiprobe, midiattach,
    108 	mididetach, midiactivate
    109 };
    110 
    111 #ifdef MIDI_SAVE
    112 #define MIDI_SAVE_SIZE 100000
    113 int midicnt;
    114 struct {
    115 	int cnt;
    116 	u_char buf[MIDI_SAVE_SIZE];
    117 } midisave;
    118 #define MIDI_GETSAVE		_IOWR('m', 100, int)
    119 
    120 #endif
    121 
    122 extern struct cfdriver midi_cd;
    123 
    124 int
    125 midiprobe(struct device *parent, struct cfdata *match, void *aux)
    126 {
    127 	struct audio_attach_args *sa = aux;
    128 
    129 	DPRINTFN(6,("midiprobe: type=%d sa=%p hw=%p\n",
    130 		 sa->type, sa, sa->hwif));
    131 	return (sa->type == AUDIODEV_TYPE_MIDI);
    132 }
    133 
    134 void
    135 midiattach(struct device *parent, struct device *self, void *aux)
    136 {
    137 	struct midi_softc *sc = (void *)self;
    138 	struct audio_attach_args *sa = aux;
    139 	struct midi_hw_if *hwp = sa->hwif;
    140 	void *hdlp = sa->hdl;
    141 
    142 	DPRINTFN(6, ("MIDI attach\n"));
    143 
    144 #ifdef DIAGNOSTIC
    145 	if (hwp == 0 ||
    146 	    hwp->open == 0 ||
    147 	    hwp->close == 0 ||
    148 	    hwp->output == 0 ||
    149 	    hwp->getinfo == 0) {
    150 		printf("midi: missing method\n");
    151 		return;
    152 	}
    153 #endif
    154 
    155 	callout_init(&sc->sc_callout);
    156 
    157 	sc->hw_if = hwp;
    158 	sc->hw_hdl = hdlp;
    159 	sc->dying = 0;
    160 	midi_attach(sc, parent);
    161 }
    162 
    163 int
    164 midiactivate(struct device *self, enum devact act)
    165 {
    166 	struct midi_softc *sc = (struct midi_softc *)self;
    167 
    168 	switch (act) {
    169 	case DVACT_ACTIVATE:
    170 		return (EOPNOTSUPP);
    171 		break;
    172 
    173 	case DVACT_DEACTIVATE:
    174 		sc->dying = 1;
    175 		break;
    176 	}
    177 	return (0);
    178 }
    179 
    180 int
    181 mididetach(struct device *self, int flags)
    182 {
    183 	struct midi_softc *sc = (struct midi_softc *)self;
    184 	int maj, mn;
    185 
    186 	DPRINTF(("midi_detach: sc=%p flags=%d\n", sc, flags));
    187 
    188 	sc->dying = 1;
    189 
    190 	wakeup(&sc->wchan);
    191 	wakeup(&sc->rchan);
    192 
    193 	/* locate the major number */
    194 	maj = cdevsw_lookup_major(&midi_cdevsw);
    195 
    196 	/* Nuke the vnodes for any open instances (calls close). */
    197 	mn = self->dv_unit;
    198 	vdevgone(maj, mn, mn, VCHR);
    199 
    200 	return (0);
    201 }
    202 
    203 void
    204 midi_attach(struct midi_softc *sc, struct device *parent)
    205 {
    206 	struct midi_info mi;
    207 
    208 	sc->isopen = 0;
    209 
    210 	midi_wait = MIDI_WAIT * hz / 1000000;
    211 	if (midi_wait == 0)
    212 		midi_wait = 1;
    213 
    214 	sc->sc_dev = parent;
    215 	sc->hw_if->getinfo(sc->hw_hdl, &mi);
    216 	sc->props = mi.props;
    217 	printf(": %s\n", mi.name);
    218 }
    219 
    220 int
    221 midi_unit_count(void)
    222 {
    223 	return midi_cd.cd_ndevs;
    224 }
    225 
    226 void
    227 midi_initbuf(struct midi_buffer *mb)
    228 {
    229 	mb->used = 0;
    230 	mb->usedhigh = MIDI_BUFSIZE;
    231 	mb->end = mb->start + mb->usedhigh;
    232 	mb->inp = mb->outp = mb->start;
    233 }
    234 
    235 int
    236 midi_sleep_timo(int *chan, char *label, int timo)
    237 {
    238 	int st;
    239 
    240 	if (!label)
    241 		label = "midi";
    242 
    243 	DPRINTFN(5, ("midi_sleep_timo: %p %s %d\n", chan, label, timo));
    244 	*chan = 1;
    245 	st = tsleep(chan, PWAIT | PCATCH, label, timo);
    246 	*chan = 0;
    247 #ifdef MIDI_DEBUG
    248 	if (st != 0)
    249 		printf("midi_sleep: %d\n", st);
    250 #endif
    251 	return st;
    252 }
    253 
    254 int
    255 midi_sleep(int *chan, char *label)
    256 {
    257 	return midi_sleep_timo(chan, label, 0);
    258 }
    259 
    260 void
    261 midi_wakeup(int *chan)
    262 {
    263 	if (*chan) {
    264 		DPRINTFN(5, ("midi_wakeup: %p\n", chan));
    265 		wakeup(chan);
    266 		*chan = 0;
    267 	}
    268 }
    269 
    270 static int midi_lengths[] = { 2,2,2,2,1,1,2,0 };
    271 /* Number of bytes in a MIDI command */
    272 #define MIDI_LENGTH(d) (midi_lengths[((d) >> 4) & 7])
    273 
    274 void
    275 midi_in(void *addr, int data)
    276 {
    277 	struct midi_softc *sc = addr;
    278 	struct midi_buffer *mb = &sc->inbuf;
    279 	int i;
    280 
    281 	if (!sc->isopen)
    282 		return;
    283 	if (data == MIDI_ACK)
    284 		return;
    285 
    286 	DPRINTFN(3, ("midi_in: sc=%p data=0x%02x state=%d pos=%d\n",
    287 		     sc, data, sc->in_state, sc->in_pos));
    288 
    289 	if (!(sc->flags & FREAD))
    290 		return;		/* discard data if not reading */
    291 
    292 	switch(sc->in_state) {
    293 	case MIDI_IN_START:
    294 		if (MIDI_IS_STATUS(data)) {
    295 			switch(data) {
    296 			case 0xf0: /* Sysex */
    297 				sc->in_state = MIDI_IN_SYSEX;
    298 				break;
    299 			case 0xf1: /* MTC quarter frame */
    300 			case 0xf3: /* Song select */
    301 				sc->in_state = MIDI_IN_DATA;
    302 				sc->in_msg[0] = data;
    303 				sc->in_pos = 1;
    304 				sc->in_left = 1;
    305 				break;
    306 			case 0xf2: /* Song position pointer */
    307 				sc->in_state = MIDI_IN_DATA;
    308 				sc->in_msg[0] = data;
    309 				sc->in_pos = 1;
    310 				sc->in_left = 2;
    311 				break;
    312 			default:
    313 				if (MIDI_IS_COMMON(data)) {
    314 					sc->in_msg[0] = data;
    315 					sc->in_pos = 1;
    316 					goto deliver;
    317 				} else {
    318 					sc->in_state = MIDI_IN_DATA;
    319 					sc->in_msg[0] = sc->in_status = data;
    320 					sc->in_pos = 1;
    321 					sc->in_left = MIDI_LENGTH(data);
    322 				}
    323 				break;
    324 			}
    325 		} else {
    326 			if (MIDI_IS_STATUS(sc->in_status)) {
    327 				sc->in_state = MIDI_IN_DATA;
    328 				sc->in_msg[0] = sc->in_status;
    329 				sc->in_msg[1] = data;
    330 				sc->in_pos = 2;
    331 				sc->in_left = MIDI_LENGTH(sc->in_status) - 1;
    332 			}
    333 		}
    334 		return;
    335 	case MIDI_IN_DATA:
    336 		sc->in_msg[sc->in_pos++] = data;
    337 		if (--sc->in_left <= 0)
    338 			break;	/* deliver data */
    339 		return;
    340 	case MIDI_IN_SYSEX:
    341 		if (data == MIDI_SYSEX_END)
    342 			sc->in_state = MIDI_IN_START;
    343 		return;
    344 	}
    345 deliver:
    346 	sc->in_state = MIDI_IN_START;
    347 #if NSEQUENCER > 0
    348 	if (sc->seqopen) {
    349 		extern void midiseq_in(struct midi_dev *,u_char *,int);
    350 		midiseq_in(sc->seq_md, sc->in_msg, sc->in_pos);
    351 		return;
    352 	}
    353 #endif
    354 
    355 	if (mb->used + sc->in_pos > mb->usedhigh) {
    356 		DPRINTF(("midi_in: buffer full, discard data=0x%02x\n",
    357 			 sc->in_msg[0]));
    358 		return;
    359 	}
    360 	for (i = 0; i < sc->in_pos; i++) {
    361 		*mb->inp++ = sc->in_msg[i];
    362 		if (mb->inp >= mb->end)
    363 			mb->inp = mb->start;
    364 		mb->used++;
    365 	}
    366 	midi_wakeup(&sc->rchan);
    367 	selwakeup(&sc->rsel);
    368 	if (sc->async)
    369 		psignal(sc->async, SIGIO);
    370 }
    371 
    372 void
    373 midi_out(void *addr)
    374 {
    375 	struct midi_softc *sc = addr;
    376 
    377 	if (!sc->isopen)
    378 		return;
    379 	DPRINTFN(3, ("midi_out: %p\n", sc));
    380 	midi_start_output(sc, 1);
    381 }
    382 
    383 int
    384 midiopen(dev_t dev, int flags, int ifmt, struct proc *p)
    385 {
    386 	struct midi_softc *sc;
    387 	struct midi_hw_if *hw;
    388 	int error;
    389 
    390 	sc = device_lookup(&midi_cd, MIDIUNIT(dev));
    391 	if (sc == NULL)
    392 		return (ENXIO);
    393 	if (sc->dying)
    394 		return (EIO);
    395 
    396 	DPRINTF(("midiopen %p\n", sc));
    397 
    398 	hw = sc->hw_if;
    399 	if (!hw)
    400 		return ENXIO;
    401 	if (sc->isopen)
    402 		return EBUSY;
    403 	sc->in_state = MIDI_IN_START;
    404 	sc->in_status = 0;
    405 	error = hw->open(sc->hw_hdl, flags, midi_in, midi_out, sc);
    406 	if (error)
    407 		return error;
    408 	sc->isopen++;
    409 	midi_initbuf(&sc->outbuf);
    410 	midi_initbuf(&sc->inbuf);
    411 	sc->flags = flags;
    412 	sc->rchan = 0;
    413 	sc->wchan = 0;
    414 	sc->pbus = 0;
    415 	sc->async = 0;
    416 
    417 #ifdef MIDI_SAVE
    418 	if (midicnt != 0) {
    419 		midisave.cnt = midicnt;
    420 		midicnt = 0;
    421 	}
    422 #endif
    423 
    424 	return 0;
    425 }
    426 
    427 int
    428 midiclose(dev_t dev, int flags, int ifmt, struct proc *p)
    429 {
    430 	int unit = MIDIUNIT(dev);
    431 	struct midi_softc *sc = midi_cd.cd_devs[unit];
    432 	struct midi_hw_if *hw = sc->hw_if;
    433 	int s, error;
    434 
    435 	DPRINTF(("midiclose %p\n", sc));
    436 
    437 	midi_start_output(sc, 0);
    438 	error = 0;
    439 	s = splaudio();
    440 	while (sc->outbuf.used > 0 && !error) {
    441 		DPRINTFN(2,("midiclose sleep used=%d\n", sc->outbuf.used));
    442 		error = midi_sleep_timo(&sc->wchan, "mid_dr", 30*hz);
    443 	}
    444 	splx(s);
    445 	sc->isopen = 0;
    446 	hw->close(sc->hw_hdl);
    447 #if NSEQUENCER > 0
    448 	sc->seqopen = 0;
    449 	sc->seq_md = 0;
    450 #endif
    451 	return 0;
    452 }
    453 
    454 int
    455 midiread(dev_t dev, struct uio *uio, int ioflag)
    456 {
    457 	int unit = MIDIUNIT(dev);
    458 	struct midi_softc *sc = midi_cd.cd_devs[unit];
    459 	struct midi_buffer *mb = &sc->inbuf;
    460 	int error;
    461 	u_char *outp;
    462 	int used, cc, n, resid;
    463 	int s;
    464 
    465 	DPRINTF(("midiread: %p, count=%lu\n", sc,
    466 		 (unsigned long)uio->uio_resid));
    467 
    468 	if (sc->dying)
    469 		return EIO;
    470 
    471 	error = 0;
    472 	resid = uio->uio_resid;
    473 	while (uio->uio_resid == resid && !error) {
    474 		s = splaudio();
    475 		while (mb->used <= 0) {
    476 			if (ioflag & IO_NDELAY) {
    477 				splx(s);
    478 				return EWOULDBLOCK;
    479 			}
    480 			error = midi_sleep(&sc->rchan, "mid rd");
    481 			if (error) {
    482 				splx(s);
    483 				return error;
    484 			}
    485 		}
    486 		used = mb->used;
    487 		outp = mb->outp;
    488 		splx(s);
    489 		if (sc->dying)
    490 			return EIO;
    491 		cc = used;	/* maximum to read */
    492 		n = mb->end - outp;
    493 		if (n < cc)
    494 			cc = n;	/* don't read beyond end of buffer */
    495 		if (uio->uio_resid < cc)
    496 			cc = uio->uio_resid; /* and no more than we want */
    497 		DPRINTFN(3, ("midiread: uiomove cc=%d\n", cc));
    498 		error = uiomove(outp, cc, uio);
    499 		if (error)
    500 			break;
    501 		used -= cc;
    502 		outp += cc;
    503 		if (outp >= mb->end)
    504 			outp = mb->start;
    505 		s = splaudio();
    506 		mb->outp = outp;
    507 		mb->used = used;
    508 		splx(s);
    509 	}
    510 	return error;
    511 }
    512 
    513 void
    514 midi_timeout(void *arg)
    515 {
    516 	struct midi_softc *sc = arg;
    517 
    518 	DPRINTFN(3,("midi_timeout: %p\n", sc));
    519 	midi_start_output(sc, 1);
    520 }
    521 
    522 int
    523 midi_start_output(struct midi_softc *sc, int intr)
    524 {
    525 	struct midi_buffer *mb = &sc->outbuf;
    526 	u_char out;
    527 	int error;
    528 	int s;
    529 	int i;
    530 
    531 	error = 0;
    532 
    533 	if (sc->dying)
    534 		return EIO;
    535 
    536 	if (sc->pbus && !intr) {
    537 		DPRINTFN(4, ("midi_start_output: busy\n"));
    538 		return 0;
    539 	}
    540 	sc->pbus = (mb->used > 0)?1:0;
    541 	for (i = 0; i < MIDI_MAX_WRITE && mb->used > 0 &&
    542 		   (!error || error==EINPROGRESS); i++) {
    543 		s = splaudio();
    544 		out = *mb->outp;
    545 		mb->outp++;
    546 		if (mb->outp >= mb->end)
    547 			mb->outp = mb->start;
    548 		mb->used--;
    549 		splx(s);
    550 #ifdef MIDI_SAVE
    551 		midisave.buf[midicnt] = out;
    552 		midicnt = (midicnt + 1) % MIDI_SAVE_SIZE;
    553 #endif
    554 		DPRINTFN(4, ("midi_start_output: %p i=%d, data=0x%02x\n",
    555 			     sc, i, out));
    556 		error = sc->hw_if->output(sc->hw_hdl, out);
    557 		if ((sc->props & MIDI_PROP_OUT_INTR) && error!=EINPROGRESS)
    558 			/* If ointr is enabled, midi_start_output()
    559 			 * normally writes only one byte,
    560 			 * except hw_if->output() returns EINPROGRESS.
    561 			 */
    562 			break;
    563 	}
    564 	midi_wakeup(&sc->wchan);
    565 	selwakeup(&sc->wsel);
    566 	if (sc->async)
    567 		psignal(sc->async, SIGIO);
    568 	if (!(sc->props & MIDI_PROP_OUT_INTR) || error==EINPROGRESS) {
    569 		if (mb->used > 0)
    570 			callout_reset(&sc->sc_callout, midi_wait,
    571 				      midi_timeout, sc);
    572 		else
    573 			sc->pbus = 0;
    574 	}
    575 	if ((sc->props & MIDI_PROP_OUT_INTR) && error==EINPROGRESS)
    576 		error = 0;
    577 
    578 	return error;
    579 }
    580 
    581 int
    582 midiwrite(dev_t dev, struct uio *uio, int ioflag)
    583 {
    584 	int unit = MIDIUNIT(dev);
    585 	struct midi_softc *sc = midi_cd.cd_devs[unit];
    586 	struct midi_buffer *mb = &sc->outbuf;
    587 	int error;
    588 	u_char *inp;
    589 	int used, cc, n;
    590 	int s;
    591 
    592 	DPRINTFN(2, ("midiwrite: %p, unit=%d, count=%lu\n", sc, unit,
    593 		     (unsigned long)uio->uio_resid));
    594 
    595 	if (sc->dying)
    596 		return EIO;
    597 
    598 	error = 0;
    599 	while (uio->uio_resid > 0 && !error) {
    600 		s = splaudio();
    601 		if (mb->used >= mb->usedhigh) {
    602 			DPRINTFN(3,("midi_write: sleep used=%d hiwat=%d\n",
    603 				 mb->used, mb->usedhigh));
    604 			if (ioflag & IO_NDELAY) {
    605 				splx(s);
    606 				return EWOULDBLOCK;
    607 			}
    608 			error = midi_sleep(&sc->wchan, "mid wr");
    609 			if (error) {
    610 				splx(s);
    611 				return error;
    612 			}
    613 		}
    614 		used = mb->used;
    615 		inp = mb->inp;
    616 		splx(s);
    617 		if (sc->dying)
    618 			return EIO;
    619 		cc = mb->usedhigh - used; 	/* maximum to write */
    620 		n = mb->end - inp;
    621 		if (n < cc)
    622 			cc = n;		/* don't write beyond end of buffer */
    623 		if (uio->uio_resid < cc)
    624 			cc = uio->uio_resid; 	/* and no more than we have */
    625 		error = uiomove(inp, cc, uio);
    626 #ifdef MIDI_DEBUG
    627 		if (error)
    628 		        printf("midi_write:(1) uiomove failed %d; "
    629 			       "cc=%d inp=%p\n",
    630 			       error, cc, inp);
    631 #endif
    632 		if (error)
    633 			break;
    634 		inp = mb->inp + cc;
    635 		if (inp >= mb->end)
    636 			inp = mb->start;
    637 		s = splaudio();
    638 		mb->inp = inp;
    639 		mb->used += cc;
    640 		splx(s);
    641 		error = midi_start_output(sc, 0);
    642 	}
    643 	return error;
    644 }
    645 
    646 /*
    647  * This write routine is only called from sequencer code and expects
    648  * a write that is smaller than the MIDI buffer.
    649  */
    650 int
    651 midi_writebytes(int unit, u_char *buf, int cc)
    652 {
    653 	struct midi_softc *sc = midi_cd.cd_devs[unit];
    654 	struct midi_buffer *mb = &sc->outbuf;
    655 	int n, s;
    656 
    657 	DPRINTFN(2, ("midi_writebytes: %p, unit=%d, cc=%d\n", sc, unit, cc));
    658 	DPRINTFN(3, ("midi_writebytes: %x %x %x\n",buf[0],buf[1],buf[2]));
    659 
    660 	if (sc->dying)
    661 		return EIO;
    662 
    663 	s = splaudio();
    664 	if (mb->used + cc >= mb->usedhigh) {
    665 		splx(s);
    666 		return (EWOULDBLOCK);
    667 	}
    668 	n = mb->end - mb->inp;
    669 	if (cc < n)
    670 		n = cc;
    671 	mb->used += cc;
    672 	memcpy(mb->inp, buf, n);
    673 	mb->inp += n;
    674 	if (mb->inp >= mb->end) {
    675 		mb->inp = mb->start;
    676 		cc -= n;
    677 		if (cc > 0) {
    678 			memcpy(mb->inp, buf + n, cc);
    679 			mb->inp += cc;
    680 		}
    681 	}
    682 	splx(s);
    683 	return (midi_start_output(sc, 0));
    684 }
    685 
    686 int
    687 midiioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p)
    688 {
    689 	int unit = MIDIUNIT(dev);
    690 	struct midi_softc *sc = midi_cd.cd_devs[unit];
    691 	struct midi_hw_if *hw = sc->hw_if;
    692 	int error;
    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 		if (hw->ioctl)
    732 			error = hw->ioctl(sc->hw_hdl, cmd, addr, flag, p);
    733 		else
    734 			error = EINVAL;
    735 		break;
    736 	}
    737 	return error;
    738 }
    739 
    740 int
    741 midipoll(dev_t dev, int events, struct proc *p)
    742 {
    743 	int unit = MIDIUNIT(dev);
    744 	struct midi_softc *sc = midi_cd.cd_devs[unit];
    745 	int revents = 0;
    746 	int s;
    747 
    748 	DPRINTF(("midipoll: %p events=0x%x\n", sc, events));
    749 
    750 	if (sc->dying)
    751 		return EIO;
    752 
    753 	s = splaudio();
    754 
    755 	if (events & (POLLIN | POLLRDNORM))
    756 		if (sc->inbuf.used > 0)
    757 			revents |= events & (POLLIN | POLLRDNORM);
    758 
    759 	if (events & (POLLOUT | POLLWRNORM))
    760 		if (sc->outbuf.used < sc->outbuf.usedhigh)
    761 			revents |= events & (POLLOUT | POLLWRNORM);
    762 
    763 	if (revents == 0) {
    764 		if (events & (POLLIN | POLLRDNORM))
    765 			selrecord(p, &sc->rsel);
    766 
    767 		if (events & (POLLOUT | POLLWRNORM))
    768 			selrecord(p, &sc->wsel);
    769 	}
    770 
    771 	splx(s);
    772 	return revents;
    773 }
    774 
    775 void
    776 midi_getinfo(dev_t dev, struct midi_info *mi)
    777 {
    778 	struct midi_softc *sc;
    779 
    780 	sc = device_lookup(&midi_cd, MIDIUNIT(dev));
    781 	if (sc == NULL)
    782 		return;
    783 	if (sc->dying)
    784 		return;
    785 
    786 	sc->hw_if->getinfo(sc->hw_hdl, mi);
    787 }
    788 
    789 #endif /* NMIDI > 0 */
    790 
    791 #if NMIDI > 0 || NMIDIBUS > 0
    792 
    793 int	audioprint(void *, const char *);
    794 
    795 struct device *
    796 midi_attach_mi(struct midi_hw_if *mhwp, void *hdlp, struct device *dev)
    797 {
    798 	struct audio_attach_args arg;
    799 
    800 #ifdef DIAGNOSTIC
    801 	if (mhwp == NULL) {
    802 		printf("midi_attach_mi: NULL\n");
    803 		return (0);
    804 	}
    805 #endif
    806 	arg.type = AUDIODEV_TYPE_MIDI;
    807 	arg.hwif = mhwp;
    808 	arg.hdl = hdlp;
    809 	return (config_found(dev, &arg, audioprint));
    810 }
    811 
    812 #endif /* NMIDI > 0 || NMIDIBUS > 0 */
    813