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midi.c revision 1.35 
      1 /*	$NetBSD: midi.c,v 1.35 2003/11/02 11:56:36 gson 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 1.35 2003/11/02 11:56:36 gson 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 				if (sc->in_left == 0)
    331 				    goto deliver;
    332 			}
    333 		}
    334 		return;
    335 	case MIDI_IN_DATA:
    336 	   	KASSERT(sc->in_left >= 1);
    337 	   	KASSERT(sc->in_pos < 3);
    338 		sc->in_msg[sc->in_pos++] = data;
    339 		if (--sc->in_left == 0)
    340 			break;	/* deliver data */
    341 		return;
    342 	case MIDI_IN_SYSEX:
    343 		if (data == MIDI_SYSEX_END)
    344 			sc->in_state = MIDI_IN_START;
    345 		return;
    346 	}
    347 deliver:
    348 	sc->in_state = MIDI_IN_START;
    349 #if NSEQUENCER > 0
    350 	if (sc->seqopen) {
    351 		extern void midiseq_in(struct midi_dev *,u_char *,int);
    352 		midiseq_in(sc->seq_md, sc->in_msg, sc->in_pos);
    353 		return;
    354 	}
    355 #endif
    356 
    357 	if (mb->used + sc->in_pos > mb->usedhigh) {
    358 		DPRINTF(("midi_in: buffer full, discard data=0x%02x\n",
    359 			 sc->in_msg[0]));
    360 		return;
    361 	}
    362 	for (i = 0; i < sc->in_pos; i++) {
    363 		*mb->inp++ = sc->in_msg[i];
    364 		if (mb->inp >= mb->end)
    365 			mb->inp = mb->start;
    366 		mb->used++;
    367 	}
    368 	midi_wakeup(&sc->rchan);
    369 	selnotify(&sc->rsel, 0);
    370 	if (sc->async)
    371 		psignal(sc->async, SIGIO);
    372 }
    373 
    374 void
    375 midi_out(void *addr)
    376 {
    377 	struct midi_softc *sc = addr;
    378 
    379 	if (!sc->isopen)
    380 		return;
    381 	DPRINTFN(3, ("midi_out: %p\n", sc));
    382 	midi_start_output(sc, 1);
    383 }
    384 
    385 int
    386 midiopen(dev_t dev, int flags, int ifmt, struct proc *p)
    387 {
    388 	struct midi_softc *sc;
    389 	struct midi_hw_if *hw;
    390 	int error;
    391 
    392 	sc = device_lookup(&midi_cd, MIDIUNIT(dev));
    393 	if (sc == NULL)
    394 		return (ENXIO);
    395 	if (sc->dying)
    396 		return (EIO);
    397 
    398 	DPRINTF(("midiopen %p\n", sc));
    399 
    400 	hw = sc->hw_if;
    401 	if (!hw)
    402 		return ENXIO;
    403 	if (sc->isopen)
    404 		return EBUSY;
    405 	sc->in_state = MIDI_IN_START;
    406 	sc->in_status = 0;
    407 	error = hw->open(sc->hw_hdl, flags, midi_in, midi_out, sc);
    408 	if (error)
    409 		return error;
    410 	sc->isopen++;
    411 	midi_initbuf(&sc->outbuf);
    412 	midi_initbuf(&sc->inbuf);
    413 	sc->flags = flags;
    414 	sc->rchan = 0;
    415 	sc->wchan = 0;
    416 	sc->pbus = 0;
    417 	sc->async = 0;
    418 
    419 #ifdef MIDI_SAVE
    420 	if (midicnt != 0) {
    421 		midisave.cnt = midicnt;
    422 		midicnt = 0;
    423 	}
    424 #endif
    425 
    426 	return 0;
    427 }
    428 
    429 int
    430 midiclose(dev_t dev, int flags, int ifmt, struct proc *p)
    431 {
    432 	int unit = MIDIUNIT(dev);
    433 	struct midi_softc *sc = midi_cd.cd_devs[unit];
    434 	struct midi_hw_if *hw = sc->hw_if;
    435 	int s, error;
    436 
    437 	DPRINTF(("midiclose %p\n", sc));
    438 
    439 	midi_start_output(sc, 0);
    440 	error = 0;
    441 	s = splaudio();
    442 	while (sc->outbuf.used > 0 && !error) {
    443 		DPRINTFN(2,("midiclose sleep used=%d\n", sc->outbuf.used));
    444 		error = midi_sleep_timo(&sc->wchan, "mid_dr", 30*hz);
    445 	}
    446 	splx(s);
    447 	sc->isopen = 0;
    448 	hw->close(sc->hw_hdl);
    449 #if NSEQUENCER > 0
    450 	sc->seqopen = 0;
    451 	sc->seq_md = 0;
    452 #endif
    453 	return 0;
    454 }
    455 
    456 int
    457 midiread(dev_t dev, struct uio *uio, int ioflag)
    458 {
    459 	int unit = MIDIUNIT(dev);
    460 	struct midi_softc *sc = midi_cd.cd_devs[unit];
    461 	struct midi_buffer *mb = &sc->inbuf;
    462 	int error;
    463 	u_char *outp;
    464 	int used, cc, n, resid;
    465 	int s;
    466 
    467 	DPRINTF(("midiread: %p, count=%lu\n", sc,
    468 		 (unsigned long)uio->uio_resid));
    469 
    470 	if (sc->dying)
    471 		return EIO;
    472 
    473 	error = 0;
    474 	resid = uio->uio_resid;
    475 	while (uio->uio_resid == resid && !error) {
    476 		s = splaudio();
    477 		while (mb->used <= 0) {
    478 			if (ioflag & IO_NDELAY) {
    479 				splx(s);
    480 				return EWOULDBLOCK;
    481 			}
    482 			error = midi_sleep(&sc->rchan, "mid rd");
    483 			if (error) {
    484 				splx(s);
    485 				return error;
    486 			}
    487 		}
    488 		used = mb->used;
    489 		outp = mb->outp;
    490 		splx(s);
    491 		if (sc->dying)
    492 			return EIO;
    493 		cc = used;	/* maximum to read */
    494 		n = mb->end - outp;
    495 		if (n < cc)
    496 			cc = n;	/* don't read beyond end of buffer */
    497 		if (uio->uio_resid < cc)
    498 			cc = uio->uio_resid; /* and no more than we want */
    499 		DPRINTFN(3, ("midiread: uiomove cc=%d\n", cc));
    500 		error = uiomove(outp, cc, uio);
    501 		if (error)
    502 			break;
    503 		used -= cc;
    504 		outp += cc;
    505 		if (outp >= mb->end)
    506 			outp = mb->start;
    507 		s = splaudio();
    508 		mb->outp = outp;
    509 		mb->used = used;
    510 		splx(s);
    511 	}
    512 	return error;
    513 }
    514 
    515 void
    516 midi_timeout(void *arg)
    517 {
    518 	struct midi_softc *sc = arg;
    519 
    520 	DPRINTFN(3,("midi_timeout: %p\n", sc));
    521 	midi_start_output(sc, 1);
    522 }
    523 
    524 int
    525 midi_start_output(struct midi_softc *sc, int intr)
    526 {
    527 	struct midi_buffer *mb = &sc->outbuf;
    528 	u_char out;
    529 	int error;
    530 	int s;
    531 	int i;
    532 
    533 	error = 0;
    534 
    535 	if (sc->dying)
    536 		return EIO;
    537 
    538 	if (sc->pbus && !intr) {
    539 		DPRINTFN(4, ("midi_start_output: busy\n"));
    540 		return 0;
    541 	}
    542 	sc->pbus = (mb->used > 0)?1:0;
    543 	for (i = 0; i < MIDI_MAX_WRITE && mb->used > 0 &&
    544 		   (!error || error==EINPROGRESS); i++) {
    545 		s = splaudio();
    546 		out = *mb->outp;
    547 		mb->outp++;
    548 		if (mb->outp >= mb->end)
    549 			mb->outp = mb->start;
    550 		mb->used--;
    551 		splx(s);
    552 #ifdef MIDI_SAVE
    553 		midisave.buf[midicnt] = out;
    554 		midicnt = (midicnt + 1) % MIDI_SAVE_SIZE;
    555 #endif
    556 		DPRINTFN(4, ("midi_start_output: %p i=%d, data=0x%02x\n",
    557 			     sc, i, out));
    558 		error = sc->hw_if->output(sc->hw_hdl, out);
    559 		if ((sc->props & MIDI_PROP_OUT_INTR) && error!=EINPROGRESS)
    560 			/* If ointr is enabled, midi_start_output()
    561 			 * normally writes only one byte,
    562 			 * except hw_if->output() returns EINPROGRESS.
    563 			 */
    564 			break;
    565 	}
    566 	midi_wakeup(&sc->wchan);
    567 	selnotify(&sc->wsel, 0);
    568 	if (sc->async)
    569 		psignal(sc->async, SIGIO);
    570 	if (!(sc->props & MIDI_PROP_OUT_INTR) || error==EINPROGRESS) {
    571 		if (mb->used > 0)
    572 			callout_reset(&sc->sc_callout, midi_wait,
    573 				      midi_timeout, sc);
    574 		else
    575 			sc->pbus = 0;
    576 	}
    577 	if ((sc->props & MIDI_PROP_OUT_INTR) && error==EINPROGRESS)
    578 		error = 0;
    579 
    580 	return error;
    581 }
    582 
    583 int
    584 midiwrite(dev_t dev, struct uio *uio, int ioflag)
    585 {
    586 	int unit = MIDIUNIT(dev);
    587 	struct midi_softc *sc = midi_cd.cd_devs[unit];
    588 	struct midi_buffer *mb = &sc->outbuf;
    589 	int error;
    590 	u_char *inp;
    591 	int used, cc, n;
    592 	int s;
    593 
    594 	DPRINTFN(2, ("midiwrite: %p, unit=%d, count=%lu\n", sc, unit,
    595 		     (unsigned long)uio->uio_resid));
    596 
    597 	if (sc->dying)
    598 		return EIO;
    599 
    600 	error = 0;
    601 	while (uio->uio_resid > 0 && !error) {
    602 		s = splaudio();
    603 		if (mb->used >= mb->usedhigh) {
    604 			DPRINTFN(3,("midi_write: sleep used=%d hiwat=%d\n",
    605 				 mb->used, mb->usedhigh));
    606 			if (ioflag & IO_NDELAY) {
    607 				splx(s);
    608 				return EWOULDBLOCK;
    609 			}
    610 			error = midi_sleep(&sc->wchan, "mid wr");
    611 			if (error) {
    612 				splx(s);
    613 				return error;
    614 			}
    615 		}
    616 		used = mb->used;
    617 		inp = mb->inp;
    618 		splx(s);
    619 		if (sc->dying)
    620 			return EIO;
    621 		cc = mb->usedhigh - used; 	/* maximum to write */
    622 		n = mb->end - inp;
    623 		if (n < cc)
    624 			cc = n;		/* don't write beyond end of buffer */
    625 		if (uio->uio_resid < cc)
    626 			cc = uio->uio_resid; 	/* and no more than we have */
    627 		error = uiomove(inp, cc, uio);
    628 #ifdef MIDI_DEBUG
    629 		if (error)
    630 		        printf("midi_write:(1) uiomove failed %d; "
    631 			       "cc=%d inp=%p\n",
    632 			       error, cc, inp);
    633 #endif
    634 		if (error)
    635 			break;
    636 		inp = mb->inp + cc;
    637 		if (inp >= mb->end)
    638 			inp = mb->start;
    639 		s = splaudio();
    640 		mb->inp = inp;
    641 		mb->used += cc;
    642 		splx(s);
    643 		error = midi_start_output(sc, 0);
    644 	}
    645 	return error;
    646 }
    647 
    648 /*
    649  * This write routine is only called from sequencer code and expects
    650  * a write that is smaller than the MIDI buffer.
    651  */
    652 int
    653 midi_writebytes(int unit, u_char *buf, int cc)
    654 {
    655 	struct midi_softc *sc = midi_cd.cd_devs[unit];
    656 	struct midi_buffer *mb = &sc->outbuf;
    657 	int n, s;
    658 
    659 	DPRINTFN(2, ("midi_writebytes: %p, unit=%d, cc=%d\n", sc, unit, cc));
    660 	DPRINTFN(3, ("midi_writebytes: %x %x %x\n",buf[0],buf[1],buf[2]));
    661 
    662 	if (sc->dying)
    663 		return EIO;
    664 
    665 	s = splaudio();
    666 	if (mb->used + cc >= mb->usedhigh) {
    667 		splx(s);
    668 		return (EWOULDBLOCK);
    669 	}
    670 	n = mb->end - mb->inp;
    671 	if (cc < n)
    672 		n = cc;
    673 	mb->used += cc;
    674 	memcpy(mb->inp, buf, n);
    675 	mb->inp += n;
    676 	if (mb->inp >= mb->end) {
    677 		mb->inp = mb->start;
    678 		cc -= n;
    679 		if (cc > 0) {
    680 			memcpy(mb->inp, buf + n, cc);
    681 			mb->inp += cc;
    682 		}
    683 	}
    684 	splx(s);
    685 	return (midi_start_output(sc, 0));
    686 }
    687 
    688 int
    689 midiioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p)
    690 {
    691 	int unit = MIDIUNIT(dev);
    692 	struct midi_softc *sc = midi_cd.cd_devs[unit];
    693 	struct midi_hw_if *hw = sc->hw_if;
    694 	int error;
    695 
    696 	DPRINTF(("midiioctl: %p cmd=0x%08lx\n", sc, cmd));
    697 
    698 	if (sc->dying)
    699 		return EIO;
    700 
    701 	error = 0;
    702 	switch (cmd) {
    703 	case FIONBIO:
    704 		/* All handled in the upper FS layer. */
    705 		break;
    706 
    707 	case FIOASYNC:
    708 		if (*(int *)addr) {
    709 			if (sc->async)
    710 				return EBUSY;
    711 			sc->async = p;
    712 			DPRINTF(("midi_ioctl: FIOASYNC %p\n", p));
    713 		} else
    714 			sc->async = 0;
    715 		break;
    716 
    717 #if 0
    718 	case MIDI_PRETIME:
    719 		/* XXX OSS
    720 		 * This should set up a read timeout, but that's
    721 		 * why we have poll(), so there's nothing yet. */
    722 		error = EINVAL;
    723 		break;
    724 #endif
    725 
    726 #ifdef MIDI_SAVE
    727 	case MIDI_GETSAVE:
    728 		error = copyout(&midisave, *(void **)addr, sizeof midisave);
    729   		break;
    730 #endif
    731 
    732 	default:
    733 		if (hw->ioctl)
    734 			error = hw->ioctl(sc->hw_hdl, cmd, addr, flag, p);
    735 		else
    736 			error = EINVAL;
    737 		break;
    738 	}
    739 	return error;
    740 }
    741 
    742 int
    743 midipoll(dev_t dev, int events, struct proc *p)
    744 {
    745 	int unit = MIDIUNIT(dev);
    746 	struct midi_softc *sc = midi_cd.cd_devs[unit];
    747 	int revents = 0;
    748 	int s;
    749 
    750 	DPRINTF(("midipoll: %p events=0x%x\n", sc, events));
    751 
    752 	if (sc->dying)
    753 		return EIO;
    754 
    755 	s = splaudio();
    756 
    757 	if (events & (POLLIN | POLLRDNORM))
    758 		if (sc->inbuf.used > 0)
    759 			revents |= events & (POLLIN | POLLRDNORM);
    760 
    761 	if (events & (POLLOUT | POLLWRNORM))
    762 		if (sc->outbuf.used < sc->outbuf.usedhigh)
    763 			revents |= events & (POLLOUT | POLLWRNORM);
    764 
    765 	if (revents == 0) {
    766 		if (events & (POLLIN | POLLRDNORM))
    767 			selrecord(p, &sc->rsel);
    768 
    769 		if (events & (POLLOUT | POLLWRNORM))
    770 			selrecord(p, &sc->wsel);
    771 	}
    772 
    773 	splx(s);
    774 	return revents;
    775 }
    776 
    777 static void
    778 filt_midirdetach(struct knote *kn)
    779 {
    780 	struct midi_softc *sc = kn->kn_hook;
    781 	int s;
    782 
    783 	s = splaudio();
    784 	SLIST_REMOVE(&sc->rsel.sel_klist, kn, knote, kn_selnext);
    785 	splx(s);
    786 }
    787 
    788 static int
    789 filt_midiread(struct knote *kn, long hint)
    790 {
    791 	struct midi_softc *sc = kn->kn_hook;
    792 
    793 	/* XXXLUKEM (thorpej): please make sure this is correct. */
    794 
    795 	kn->kn_data = sc->inbuf.used;
    796 	return (kn->kn_data > 0);
    797 }
    798 
    799 static const struct filterops midiread_filtops =
    800 	{ 1, NULL, filt_midirdetach, filt_midiread };
    801 
    802 static void
    803 filt_midiwdetach(struct knote *kn)
    804 {
    805 	struct midi_softc *sc = kn->kn_hook;
    806 	int s;
    807 
    808 	s = splaudio();
    809 	SLIST_REMOVE(&sc->wsel.sel_klist, kn, knote, kn_selnext);
    810 	splx(s);
    811 }
    812 
    813 static int
    814 filt_midiwrite(struct knote *kn, long hint)
    815 {
    816 	struct midi_softc *sc = kn->kn_hook;
    817 
    818 	/* XXXLUKEM (thorpej): please make sure this is correct. */
    819 
    820 	kn->kn_data = sc->outbuf.usedhigh - sc->outbuf.used;
    821 	return (kn->kn_data > 0);
    822 }
    823 
    824 static const struct filterops midiwrite_filtops =
    825 	{ 1, NULL, filt_midiwdetach, filt_midiwrite };
    826 
    827 int
    828 midikqfilter(dev_t dev, struct knote *kn)
    829 {
    830 	int unit = MIDIUNIT(dev);
    831 	struct midi_softc *sc = midi_cd.cd_devs[unit];
    832 	struct klist *klist;
    833 	int s;
    834 
    835 	switch (kn->kn_filter) {
    836 	case EVFILT_READ:
    837 		klist = &sc->rsel.sel_klist;
    838 		kn->kn_fop = &midiread_filtops;
    839 		break;
    840 
    841 	case EVFILT_WRITE:
    842 		klist = &sc->wsel.sel_klist;
    843 		kn->kn_fop = &midiwrite_filtops;
    844 		break;
    845 
    846 	default:
    847 		return (1);
    848 	}
    849 
    850 	kn->kn_hook = sc;
    851 
    852 	s = splaudio();
    853 	SLIST_INSERT_HEAD(klist, kn, kn_selnext);
    854 	splx(s);
    855 
    856 	return (0);
    857 }
    858 
    859 void
    860 midi_getinfo(dev_t dev, struct midi_info *mi)
    861 {
    862 	struct midi_softc *sc;
    863 
    864 	sc = device_lookup(&midi_cd, MIDIUNIT(dev));
    865 	if (sc == NULL)
    866 		return;
    867 	if (sc->dying)
    868 		return;
    869 
    870 	sc->hw_if->getinfo(sc->hw_hdl, mi);
    871 }
    872 
    873 #endif /* NMIDI > 0 */
    874 
    875 #if NMIDI > 0 || NMIDIBUS > 0
    876 
    877 int	audioprint(void *, const char *);
    878 
    879 struct device *
    880 midi_attach_mi(struct midi_hw_if *mhwp, void *hdlp, struct device *dev)
    881 {
    882 	struct audio_attach_args arg;
    883 
    884 #ifdef DIAGNOSTIC
    885 	if (mhwp == NULL) {
    886 		aprint_error("midi_attach_mi: NULL\n");
    887 		return (0);
    888 	}
    889 #endif
    890 	arg.type = AUDIODEV_TYPE_MIDI;
    891 	arg.hwif = mhwp;
    892 	arg.hdl = hdlp;
    893 	return (config_found(dev, &arg, audioprint));
    894 }
    895 
    896 #endif /* NMIDI > 0 || NMIDIBUS > 0 */
    897