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midi.c revision 1.34 
      1 /*	$NetBSD: midi.c,v 1.34 2003/06/29 22:30:00 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 <sys/cdefs.h>
     40 __KERNEL_RCSID(0, "$NetBSD: midi.c,v 1.34 2003/06/29 22:30:00 fvdl 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 dev_type_kqfilter(midikqfilter);
    101 
    102 const struct cdevsw midi_cdevsw = {
    103 	midiopen, midiclose, midiread, midiwrite, midiioctl,
    104 	nostop, notty, midipoll, nommap, midikqfilter,
    105 };
    106 
    107 CFATTACH_DECL(midi, sizeof(struct midi_softc),
    108     midiprobe, midiattach, mididetach, midiactivate);
    109 
    110 #ifdef MIDI_SAVE
    111 #define MIDI_SAVE_SIZE 100000
    112 int midicnt;
    113 struct {
    114 	int cnt;
    115 	u_char buf[MIDI_SAVE_SIZE];
    116 } midisave;
    117 #define MIDI_GETSAVE		_IOWR('m', 100, int)
    118 
    119 #endif
    120 
    121 extern struct cfdriver midi_cd;
    122 
    123 int
    124 midiprobe(struct device *parent, struct cfdata *match, void *aux)
    125 {
    126 	struct audio_attach_args *sa = aux;
    127 
    128 	DPRINTFN(6,("midiprobe: type=%d sa=%p hw=%p\n",
    129 		 sa->type, sa, sa->hwif));
    130 	return (sa->type == AUDIODEV_TYPE_MIDI);
    131 }
    132 
    133 void
    134 midiattach(struct device *parent, struct device *self, void *aux)
    135 {
    136 	struct midi_softc *sc = (void *)self;
    137 	struct audio_attach_args *sa = aux;
    138 	struct midi_hw_if *hwp = sa->hwif;
    139 	void *hdlp = sa->hdl;
    140 
    141 	DPRINTFN(6, ("MIDI attach\n"));
    142 
    143 #ifdef DIAGNOSTIC
    144 	if (hwp == 0 ||
    145 	    hwp->open == 0 ||
    146 	    hwp->close == 0 ||
    147 	    hwp->output == 0 ||
    148 	    hwp->getinfo == 0) {
    149 		printf("midi: missing method\n");
    150 		return;
    151 	}
    152 #endif
    153 
    154 	callout_init(&sc->sc_callout);
    155 
    156 	sc->hw_if = hwp;
    157 	sc->hw_hdl = hdlp;
    158 	sc->dying = 0;
    159 	midi_attach(sc, parent);
    160 }
    161 
    162 int
    163 midiactivate(struct device *self, enum devact act)
    164 {
    165 	struct midi_softc *sc = (struct midi_softc *)self;
    166 
    167 	switch (act) {
    168 	case DVACT_ACTIVATE:
    169 		return (EOPNOTSUPP);
    170 
    171 	case DVACT_DEACTIVATE:
    172 		sc->dying = 1;
    173 		break;
    174 	}
    175 	return (0);
    176 }
    177 
    178 int
    179 mididetach(struct device *self, int flags)
    180 {
    181 	struct midi_softc *sc = (struct midi_softc *)self;
    182 	int maj, mn;
    183 
    184 	DPRINTF(("midi_detach: sc=%p flags=%d\n", sc, flags));
    185 
    186 	sc->dying = 1;
    187 
    188 	wakeup(&sc->wchan);
    189 	wakeup(&sc->rchan);
    190 
    191 	/* locate the major number */
    192 	maj = cdevsw_lookup_major(&midi_cdevsw);
    193 
    194 	/* Nuke the vnodes for any open instances (calls close). */
    195 	mn = self->dv_unit;
    196 	vdevgone(maj, mn, mn, VCHR);
    197 
    198 	return (0);
    199 }
    200 
    201 void
    202 midi_attach(struct midi_softc *sc, struct device *parent)
    203 {
    204 	struct midi_info mi;
    205 
    206 	sc->isopen = 0;
    207 
    208 	midi_wait = MIDI_WAIT * hz / 1000000;
    209 	if (midi_wait == 0)
    210 		midi_wait = 1;
    211 
    212 	sc->sc_dev = parent;
    213 	sc->hw_if->getinfo(sc->hw_hdl, &mi);
    214 	sc->props = mi.props;
    215 	printf(": %s\n", mi.name);
    216 }
    217 
    218 int
    219 midi_unit_count(void)
    220 {
    221 	return midi_cd.cd_ndevs;
    222 }
    223 
    224 void
    225 midi_initbuf(struct midi_buffer *mb)
    226 {
    227 	mb->used = 0;
    228 	mb->usedhigh = MIDI_BUFSIZE;
    229 	mb->end = mb->start + mb->usedhigh;
    230 	mb->inp = mb->outp = mb->start;
    231 }
    232 
    233 int
    234 midi_sleep_timo(int *chan, char *label, int timo)
    235 {
    236 	int st;
    237 
    238 	if (!label)
    239 		label = "midi";
    240 
    241 	DPRINTFN(5, ("midi_sleep_timo: %p %s %d\n", chan, label, timo));
    242 	*chan = 1;
    243 	st = tsleep(chan, PWAIT | PCATCH, label, timo);
    244 	*chan = 0;
    245 #ifdef MIDI_DEBUG
    246 	if (st != 0)
    247 		printf("midi_sleep: %d\n", st);
    248 #endif
    249 	return st;
    250 }
    251 
    252 int
    253 midi_sleep(int *chan, char *label)
    254 {
    255 	return midi_sleep_timo(chan, label, 0);
    256 }
    257 
    258 void
    259 midi_wakeup(int *chan)
    260 {
    261 	if (*chan) {
    262 		DPRINTFN(5, ("midi_wakeup: %p\n", chan));
    263 		wakeup(chan);
    264 		*chan = 0;
    265 	}
    266 }
    267 
    268 static int midi_lengths[] = { 2,2,2,2,1,1,2,0 };
    269 /* Number of bytes in a MIDI command */
    270 #define MIDI_LENGTH(d) (midi_lengths[((d) >> 4) & 7])
    271 
    272 void
    273 midi_in(void *addr, int data)
    274 {
    275 	struct midi_softc *sc = addr;
    276 	struct midi_buffer *mb = &sc->inbuf;
    277 	int i;
    278 
    279 	if (!sc->isopen)
    280 		return;
    281 	if (data == MIDI_ACK)
    282 		return;
    283 
    284 	DPRINTFN(3, ("midi_in: sc=%p data=0x%02x state=%d pos=%d\n",
    285 		     sc, data, sc->in_state, sc->in_pos));
    286 
    287 	if (!(sc->flags & FREAD))
    288 		return;		/* discard data if not reading */
    289 
    290 	switch(sc->in_state) {
    291 	case MIDI_IN_START:
    292 		if (MIDI_IS_STATUS(data)) {
    293 			switch(data) {
    294 			case 0xf0: /* Sysex */
    295 				sc->in_state = MIDI_IN_SYSEX;
    296 				break;
    297 			case 0xf1: /* MTC quarter frame */
    298 			case 0xf3: /* Song select */
    299 				sc->in_state = MIDI_IN_DATA;
    300 				sc->in_msg[0] = data;
    301 				sc->in_pos = 1;
    302 				sc->in_left = 1;
    303 				break;
    304 			case 0xf2: /* Song position pointer */
    305 				sc->in_state = MIDI_IN_DATA;
    306 				sc->in_msg[0] = data;
    307 				sc->in_pos = 1;
    308 				sc->in_left = 2;
    309 				break;
    310 			default:
    311 				if (MIDI_IS_COMMON(data)) {
    312 					sc->in_msg[0] = data;
    313 					sc->in_pos = 1;
    314 					goto deliver;
    315 				} else {
    316 					sc->in_state = MIDI_IN_DATA;
    317 					sc->in_msg[0] = sc->in_status = data;
    318 					sc->in_pos = 1;
    319 					sc->in_left = MIDI_LENGTH(data);
    320 				}
    321 				break;
    322 			}
    323 		} else {
    324 			if (MIDI_IS_STATUS(sc->in_status)) {
    325 				sc->in_state = MIDI_IN_DATA;
    326 				sc->in_msg[0] = sc->in_status;
    327 				sc->in_msg[1] = data;
    328 				sc->in_pos = 2;
    329 				sc->in_left = MIDI_LENGTH(sc->in_status) - 1;
    330 			}
    331 		}
    332 		return;
    333 	case MIDI_IN_DATA:
    334 		sc->in_msg[sc->in_pos++] = data;
    335 		if (--sc->in_left <= 0)
    336 			break;	/* deliver data */
    337 		return;
    338 	case MIDI_IN_SYSEX:
    339 		if (data == MIDI_SYSEX_END)
    340 			sc->in_state = MIDI_IN_START;
    341 		return;
    342 	}
    343 deliver:
    344 	sc->in_state = MIDI_IN_START;
    345 #if NSEQUENCER > 0
    346 	if (sc->seqopen) {
    347 		extern void midiseq_in(struct midi_dev *,u_char *,int);
    348 		midiseq_in(sc->seq_md, sc->in_msg, sc->in_pos);
    349 		return;
    350 	}
    351 #endif
    352 
    353 	if (mb->used + sc->in_pos > mb->usedhigh) {
    354 		DPRINTF(("midi_in: buffer full, discard data=0x%02x\n",
    355 			 sc->in_msg[0]));
    356 		return;
    357 	}
    358 	for (i = 0; i < sc->in_pos; i++) {
    359 		*mb->inp++ = sc->in_msg[i];
    360 		if (mb->inp >= mb->end)
    361 			mb->inp = mb->start;
    362 		mb->used++;
    363 	}
    364 	midi_wakeup(&sc->rchan);
    365 	selnotify(&sc->rsel, 0);
    366 	if (sc->async)
    367 		psignal(sc->async, SIGIO);
    368 }
    369 
    370 void
    371 midi_out(void *addr)
    372 {
    373 	struct midi_softc *sc = addr;
    374 
    375 	if (!sc->isopen)
    376 		return;
    377 	DPRINTFN(3, ("midi_out: %p\n", sc));
    378 	midi_start_output(sc, 1);
    379 }
    380 
    381 int
    382 midiopen(dev_t dev, int flags, int ifmt, struct proc *p)
    383 {
    384 	struct midi_softc *sc;
    385 	struct midi_hw_if *hw;
    386 	int error;
    387 
    388 	sc = device_lookup(&midi_cd, MIDIUNIT(dev));
    389 	if (sc == NULL)
    390 		return (ENXIO);
    391 	if (sc->dying)
    392 		return (EIO);
    393 
    394 	DPRINTF(("midiopen %p\n", sc));
    395 
    396 	hw = sc->hw_if;
    397 	if (!hw)
    398 		return ENXIO;
    399 	if (sc->isopen)
    400 		return EBUSY;
    401 	sc->in_state = MIDI_IN_START;
    402 	sc->in_status = 0;
    403 	error = hw->open(sc->hw_hdl, flags, midi_in, midi_out, sc);
    404 	if (error)
    405 		return error;
    406 	sc->isopen++;
    407 	midi_initbuf(&sc->outbuf);
    408 	midi_initbuf(&sc->inbuf);
    409 	sc->flags = flags;
    410 	sc->rchan = 0;
    411 	sc->wchan = 0;
    412 	sc->pbus = 0;
    413 	sc->async = 0;
    414 
    415 #ifdef MIDI_SAVE
    416 	if (midicnt != 0) {
    417 		midisave.cnt = midicnt;
    418 		midicnt = 0;
    419 	}
    420 #endif
    421 
    422 	return 0;
    423 }
    424 
    425 int
    426 midiclose(dev_t dev, int flags, int ifmt, struct proc *p)
    427 {
    428 	int unit = MIDIUNIT(dev);
    429 	struct midi_softc *sc = midi_cd.cd_devs[unit];
    430 	struct midi_hw_if *hw = sc->hw_if;
    431 	int s, error;
    432 
    433 	DPRINTF(("midiclose %p\n", sc));
    434 
    435 	midi_start_output(sc, 0);
    436 	error = 0;
    437 	s = splaudio();
    438 	while (sc->outbuf.used > 0 && !error) {
    439 		DPRINTFN(2,("midiclose sleep used=%d\n", sc->outbuf.used));
    440 		error = midi_sleep_timo(&sc->wchan, "mid_dr", 30*hz);
    441 	}
    442 	splx(s);
    443 	sc->isopen = 0;
    444 	hw->close(sc->hw_hdl);
    445 #if NSEQUENCER > 0
    446 	sc->seqopen = 0;
    447 	sc->seq_md = 0;
    448 #endif
    449 	return 0;
    450 }
    451 
    452 int
    453 midiread(dev_t dev, struct uio *uio, int ioflag)
    454 {
    455 	int unit = MIDIUNIT(dev);
    456 	struct midi_softc *sc = midi_cd.cd_devs[unit];
    457 	struct midi_buffer *mb = &sc->inbuf;
    458 	int error;
    459 	u_char *outp;
    460 	int used, cc, n, resid;
    461 	int s;
    462 
    463 	DPRINTF(("midiread: %p, count=%lu\n", sc,
    464 		 (unsigned long)uio->uio_resid));
    465 
    466 	if (sc->dying)
    467 		return EIO;
    468 
    469 	error = 0;
    470 	resid = uio->uio_resid;
    471 	while (uio->uio_resid == resid && !error) {
    472 		s = splaudio();
    473 		while (mb->used <= 0) {
    474 			if (ioflag & IO_NDELAY) {
    475 				splx(s);
    476 				return EWOULDBLOCK;
    477 			}
    478 			error = midi_sleep(&sc->rchan, "mid rd");
    479 			if (error) {
    480 				splx(s);
    481 				return error;
    482 			}
    483 		}
    484 		used = mb->used;
    485 		outp = mb->outp;
    486 		splx(s);
    487 		if (sc->dying)
    488 			return EIO;
    489 		cc = used;	/* maximum to read */
    490 		n = mb->end - outp;
    491 		if (n < cc)
    492 			cc = n;	/* don't read beyond end of buffer */
    493 		if (uio->uio_resid < cc)
    494 			cc = uio->uio_resid; /* and no more than we want */
    495 		DPRINTFN(3, ("midiread: uiomove cc=%d\n", cc));
    496 		error = uiomove(outp, cc, uio);
    497 		if (error)
    498 			break;
    499 		used -= cc;
    500 		outp += cc;
    501 		if (outp >= mb->end)
    502 			outp = mb->start;
    503 		s = splaudio();
    504 		mb->outp = outp;
    505 		mb->used = used;
    506 		splx(s);
    507 	}
    508 	return error;
    509 }
    510 
    511 void
    512 midi_timeout(void *arg)
    513 {
    514 	struct midi_softc *sc = arg;
    515 
    516 	DPRINTFN(3,("midi_timeout: %p\n", sc));
    517 	midi_start_output(sc, 1);
    518 }
    519 
    520 int
    521 midi_start_output(struct midi_softc *sc, int intr)
    522 {
    523 	struct midi_buffer *mb = &sc->outbuf;
    524 	u_char out;
    525 	int error;
    526 	int s;
    527 	int i;
    528 
    529 	error = 0;
    530 
    531 	if (sc->dying)
    532 		return EIO;
    533 
    534 	if (sc->pbus && !intr) {
    535 		DPRINTFN(4, ("midi_start_output: busy\n"));
    536 		return 0;
    537 	}
    538 	sc->pbus = (mb->used > 0)?1:0;
    539 	for (i = 0; i < MIDI_MAX_WRITE && mb->used > 0 &&
    540 		   (!error || error==EINPROGRESS); i++) {
    541 		s = splaudio();
    542 		out = *mb->outp;
    543 		mb->outp++;
    544 		if (mb->outp >= mb->end)
    545 			mb->outp = mb->start;
    546 		mb->used--;
    547 		splx(s);
    548 #ifdef MIDI_SAVE
    549 		midisave.buf[midicnt] = out;
    550 		midicnt = (midicnt + 1) % MIDI_SAVE_SIZE;
    551 #endif
    552 		DPRINTFN(4, ("midi_start_output: %p i=%d, data=0x%02x\n",
    553 			     sc, i, out));
    554 		error = sc->hw_if->output(sc->hw_hdl, out);
    555 		if ((sc->props & MIDI_PROP_OUT_INTR) && error!=EINPROGRESS)
    556 			/* If ointr is enabled, midi_start_output()
    557 			 * normally writes only one byte,
    558 			 * except hw_if->output() returns EINPROGRESS.
    559 			 */
    560 			break;
    561 	}
    562 	midi_wakeup(&sc->wchan);
    563 	selnotify(&sc->wsel, 0);
    564 	if (sc->async)
    565 		psignal(sc->async, SIGIO);
    566 	if (!(sc->props & MIDI_PROP_OUT_INTR) || error==EINPROGRESS) {
    567 		if (mb->used > 0)
    568 			callout_reset(&sc->sc_callout, midi_wait,
    569 				      midi_timeout, sc);
    570 		else
    571 			sc->pbus = 0;
    572 	}
    573 	if ((sc->props & MIDI_PROP_OUT_INTR) && error==EINPROGRESS)
    574 		error = 0;
    575 
    576 	return error;
    577 }
    578 
    579 int
    580 midiwrite(dev_t dev, struct uio *uio, int ioflag)
    581 {
    582 	int unit = MIDIUNIT(dev);
    583 	struct midi_softc *sc = midi_cd.cd_devs[unit];
    584 	struct midi_buffer *mb = &sc->outbuf;
    585 	int error;
    586 	u_char *inp;
    587 	int used, cc, n;
    588 	int s;
    589 
    590 	DPRINTFN(2, ("midiwrite: %p, unit=%d, count=%lu\n", sc, unit,
    591 		     (unsigned long)uio->uio_resid));
    592 
    593 	if (sc->dying)
    594 		return EIO;
    595 
    596 	error = 0;
    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(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p)
    686 {
    687 	int unit = MIDIUNIT(dev);
    688 	struct midi_softc *sc = midi_cd.cd_devs[unit];
    689 	struct midi_hw_if *hw = sc->hw_if;
    690 	int error;
    691 
    692 	DPRINTF(("midiioctl: %p cmd=0x%08lx\n", sc, cmd));
    693 
    694 	if (sc->dying)
    695 		return EIO;
    696 
    697 	error = 0;
    698 	switch (cmd) {
    699 	case FIONBIO:
    700 		/* All handled in the upper FS layer. */
    701 		break;
    702 
    703 	case FIOASYNC:
    704 		if (*(int *)addr) {
    705 			if (sc->async)
    706 				return EBUSY;
    707 			sc->async = p;
    708 			DPRINTF(("midi_ioctl: FIOASYNC %p\n", p));
    709 		} else
    710 			sc->async = 0;
    711 		break;
    712 
    713 #if 0
    714 	case MIDI_PRETIME:
    715 		/* XXX OSS
    716 		 * This should set up a read timeout, but that's
    717 		 * why we have poll(), so there's nothing yet. */
    718 		error = EINVAL;
    719 		break;
    720 #endif
    721 
    722 #ifdef MIDI_SAVE
    723 	case MIDI_GETSAVE:
    724 		error = copyout(&midisave, *(void **)addr, sizeof midisave);
    725   		break;
    726 #endif
    727 
    728 	default:
    729 		if (hw->ioctl)
    730 			error = hw->ioctl(sc->hw_hdl, cmd, addr, flag, p);
    731 		else
    732 			error = EINVAL;
    733 		break;
    734 	}
    735 	return error;
    736 }
    737 
    738 int
    739 midipoll(dev_t dev, int events, struct proc *p)
    740 {
    741 	int unit = MIDIUNIT(dev);
    742 	struct midi_softc *sc = midi_cd.cd_devs[unit];
    743 	int revents = 0;
    744 	int s;
    745 
    746 	DPRINTF(("midipoll: %p events=0x%x\n", sc, events));
    747 
    748 	if (sc->dying)
    749 		return EIO;
    750 
    751 	s = splaudio();
    752 
    753 	if (events & (POLLIN | POLLRDNORM))
    754 		if (sc->inbuf.used > 0)
    755 			revents |= events & (POLLIN | POLLRDNORM);
    756 
    757 	if (events & (POLLOUT | POLLWRNORM))
    758 		if (sc->outbuf.used < sc->outbuf.usedhigh)
    759 			revents |= events & (POLLOUT | POLLWRNORM);
    760 
    761 	if (revents == 0) {
    762 		if (events & (POLLIN | POLLRDNORM))
    763 			selrecord(p, &sc->rsel);
    764 
    765 		if (events & (POLLOUT | POLLWRNORM))
    766 			selrecord(p, &sc->wsel);
    767 	}
    768 
    769 	splx(s);
    770 	return revents;
    771 }
    772 
    773 static void
    774 filt_midirdetach(struct knote *kn)
    775 {
    776 	struct midi_softc *sc = kn->kn_hook;
    777 	int s;
    778 
    779 	s = splaudio();
    780 	SLIST_REMOVE(&sc->rsel.sel_klist, kn, knote, kn_selnext);
    781 	splx(s);
    782 }
    783 
    784 static int
    785 filt_midiread(struct knote *kn, long hint)
    786 {
    787 	struct midi_softc *sc = kn->kn_hook;
    788 
    789 	/* XXXLUKEM (thorpej): please make sure this is correct. */
    790 
    791 	kn->kn_data = sc->inbuf.used;
    792 	return (kn->kn_data > 0);
    793 }
    794 
    795 static const struct filterops midiread_filtops =
    796 	{ 1, NULL, filt_midirdetach, filt_midiread };
    797 
    798 static void
    799 filt_midiwdetach(struct knote *kn)
    800 {
    801 	struct midi_softc *sc = kn->kn_hook;
    802 	int s;
    803 
    804 	s = splaudio();
    805 	SLIST_REMOVE(&sc->wsel.sel_klist, kn, knote, kn_selnext);
    806 	splx(s);
    807 }
    808 
    809 static int
    810 filt_midiwrite(struct knote *kn, long hint)
    811 {
    812 	struct midi_softc *sc = kn->kn_hook;
    813 
    814 	/* XXXLUKEM (thorpej): please make sure this is correct. */
    815 
    816 	kn->kn_data = sc->outbuf.usedhigh - sc->outbuf.used;
    817 	return (kn->kn_data > 0);
    818 }
    819 
    820 static const struct filterops midiwrite_filtops =
    821 	{ 1, NULL, filt_midiwdetach, filt_midiwrite };
    822 
    823 int
    824 midikqfilter(dev_t dev, struct knote *kn)
    825 {
    826 	int unit = MIDIUNIT(dev);
    827 	struct midi_softc *sc = midi_cd.cd_devs[unit];
    828 	struct klist *klist;
    829 	int s;
    830 
    831 	switch (kn->kn_filter) {
    832 	case EVFILT_READ:
    833 		klist = &sc->rsel.sel_klist;
    834 		kn->kn_fop = &midiread_filtops;
    835 		break;
    836 
    837 	case EVFILT_WRITE:
    838 		klist = &sc->wsel.sel_klist;
    839 		kn->kn_fop = &midiwrite_filtops;
    840 		break;
    841 
    842 	default:
    843 		return (1);
    844 	}
    845 
    846 	kn->kn_hook = sc;
    847 
    848 	s = splaudio();
    849 	SLIST_INSERT_HEAD(klist, kn, kn_selnext);
    850 	splx(s);
    851 
    852 	return (0);
    853 }
    854 
    855 void
    856 midi_getinfo(dev_t dev, struct midi_info *mi)
    857 {
    858 	struct midi_softc *sc;
    859 
    860 	sc = device_lookup(&midi_cd, MIDIUNIT(dev));
    861 	if (sc == NULL)
    862 		return;
    863 	if (sc->dying)
    864 		return;
    865 
    866 	sc->hw_if->getinfo(sc->hw_hdl, mi);
    867 }
    868 
    869 #endif /* NMIDI > 0 */
    870 
    871 #if NMIDI > 0 || NMIDIBUS > 0
    872 
    873 int	audioprint(void *, const char *);
    874 
    875 struct device *
    876 midi_attach_mi(struct midi_hw_if *mhwp, void *hdlp, struct device *dev)
    877 {
    878 	struct audio_attach_args arg;
    879 
    880 #ifdef DIAGNOSTIC
    881 	if (mhwp == NULL) {
    882 		aprint_error("midi_attach_mi: NULL\n");
    883 		return (0);
    884 	}
    885 #endif
    886 	arg.type = AUDIODEV_TYPE_MIDI;
    887 	arg.hwif = mhwp;
    888 	arg.hdl = hdlp;
    889 	return (config_found(dev, &arg, audioprint));
    890 }
    891 
    892 #endif /* NMIDI > 0 || NMIDIBUS > 0 */
    893