midi.c revision 1.2
1 /* $NetBSD: midi.c,v 1.2 1998/08/12 18:11:53 augustss Exp $ */ 2 3 /* 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Author: Lennart Augustsson 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the NetBSD 20 * Foundation, Inc. and its contributors. 21 * 4. Neither the name of The NetBSD Foundation nor the names of its 22 * contributors may be used to endorse or promote products derived 23 * from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 26 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include "midi.h" 39 #if NMIDI > 0 40 41 #include "sequencer.h" 42 43 #include <sys/param.h> 44 #include <sys/ioctl.h> 45 #include <sys/fcntl.h> 46 #include <sys/vnode.h> 47 #include <sys/select.h> 48 #include <sys/poll.h> 49 #include <sys/malloc.h> 50 #include <sys/proc.h> 51 #include <sys/systm.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 60 #include <dev/audio_if.h> 61 #include <dev/midivar.h> 62 63 #ifdef AUDIO_DEBUG 64 #define DPRINTF(x) if (mididebug) printf x 65 #define DPRINTFN(n,x) if (mididebug >= (n)) printf x 66 int mididebug = 0; 67 #else 68 #define DPRINTF(x) 69 #define DPRINTFN(n,x) 70 #endif 71 72 int midi_wait; 73 74 void midi_in __P((void *, int)); 75 void midi_out __P((void *)); 76 int midi_start_output __P((struct midi_softc *, int)); 77 int midi_sleep_timo __P((int *, char *, int)); 78 int midi_sleep __P((int *, char *)); 79 void midi_wakeup __P((int *)); 80 void midi_initbuf __P((struct midi_buffer *)); 81 void midi_timeout __P((void *)); 82 83 int midiprobe __P((struct device *, struct cfdata *, void *)); 84 void midiattach __P((struct device *, struct device *, void *)); 85 86 struct cfattach midi_ca = { 87 sizeof(struct midi_softc), midiprobe, midiattach 88 }; 89 90 extern struct cfdriver midi_cd; 91 92 int 93 midiprobe(parent, match, aux) 94 struct device *parent; 95 struct cfdata *match; 96 void *aux; 97 { 98 struct audio_attach_args *sa = aux; 99 100 DPRINTFN(6,("midiprobe: type=%d sa=%p hw=%p\n", 101 sa->type, sa, sa->hwif)); 102 return (sa->type == AUDIODEV_TYPE_MIDI) ? 1 : 0; 103 } 104 105 void 106 midiattach(parent, self, aux) 107 struct device *parent, *self; 108 void *aux; 109 { 110 struct midi_softc *sc = (void *)self; 111 struct audio_attach_args *sa = aux; 112 struct midi_hw_if *hwp = sa->hwif; 113 void *hdlp = sa->hdl; 114 115 DPRINTFN(6, ("MIDI attach\n")); 116 117 #ifdef DIAGNOSTIC 118 if (hwp == 0 || 119 hwp->open == 0 || 120 hwp->close == 0 || 121 hwp->output == 0 || 122 hwp->getinfo == 0) { 123 printf("midi: missing method\n"); 124 return; 125 } 126 #endif 127 sc->hw_if = hwp; 128 sc->hw_hdl = hdlp; 129 midi_attach(sc, parent); 130 } 131 132 void 133 midi_attach(sc, parent) 134 struct midi_softc *sc; 135 struct device *parent; 136 { 137 struct midi_info mi; 138 139 sc->isopen = 0; 140 141 midi_initbuf(&sc->outbuf); 142 midi_initbuf(&sc->inbuf); 143 144 midi_wait = MIDI_WAIT * hz / 1000000; 145 if (midi_wait == 0) 146 midi_wait = 1; 147 148 sc->sc_dev = parent; 149 sc->hw_if->getinfo(sc->hw_hdl, &mi); 150 sc->props = mi.props; 151 printf(": <%s>\n", mi.name); 152 } 153 154 int 155 midi_unit_count() 156 { 157 return midi_cd.cd_ndevs; 158 } 159 160 void 161 midi_initbuf(mb) 162 struct midi_buffer *mb; 163 { 164 mb->used = 0; 165 mb->usedhigh = MIDI_BUFSIZE; 166 mb->end = mb->start + mb->usedhigh; 167 mb->inp = mb->outp = mb->start; 168 } 169 170 int 171 midi_sleep_timo(chan, label, timo) 172 int *chan; 173 char *label; 174 int timo; 175 { 176 int st; 177 178 if (!label) 179 label = "midi"; 180 181 DPRINTFN(5, ("midi_sleep_timo: %p %s %d\n", chan, label, timo)); 182 *chan = 1; 183 st = tsleep(chan, PWAIT | PCATCH, label, timo); 184 *chan = 0; 185 #ifdef MIDI_DEBUG 186 if (st != 0) 187 printf("midi_sleep: %d\n", st); 188 #endif 189 return st; 190 } 191 192 int 193 midi_sleep(chan, label) 194 int *chan; 195 char *label; 196 { 197 return midi_sleep_timo(chan, label, 0); 198 } 199 200 void 201 midi_wakeup(chan) 202 int *chan; 203 { 204 if (*chan) { 205 DPRINTFN(5, ("midi_wakeup: %p\n", chan)); 206 wakeup(chan); 207 *chan = 0; 208 } 209 } 210 211 static int midi_lengths[] = { 2,2,2,2,1,1,2,0 }; 212 /* Number of bytes in a MIDI command */ 213 #define MIDI_LENGTH(d) (midi_lengths[((d) >> 4) & 7]) 214 215 void 216 midi_in(addr, data) 217 void *addr; 218 int data; 219 { 220 struct midi_softc *sc = addr; 221 struct midi_buffer *mb = &sc->inbuf; 222 int i; 223 224 if (data == MIDI_ACK) 225 return; 226 DPRINTFN(3, ("midi_in: %p 0x%02x\n", sc, data)); 227 if (!(sc->flags & FREAD)) 228 return; /* discard data if not reading */ 229 230 switch(sc->in_state) { 231 case MIDI_IN_START: 232 if (MIDI_IS_STATUS(data)) { 233 switch(data) { 234 case 0xf0: /* Sysex */ 235 sc->in_state = MIDI_IN_SYSEX; 236 break; 237 case 0xf1: /* MTC quarter frame */ 238 case 0xf3: /* Song select */ 239 sc->in_state = MIDI_IN_DATA; 240 sc->in_msg[0] = data; 241 sc->in_pos = 1; 242 sc->in_left = 1; 243 break; 244 case 0xf2: /* Song position pointer */ 245 sc->in_state = MIDI_IN_DATA; 246 sc->in_msg[0] = data; 247 sc->in_pos = 1; 248 sc->in_left = 2; 249 break; 250 default: 251 if (MIDI_IS_COMMON(data)) { 252 sc->in_msg[0] = data; 253 sc->in_pos = 1; 254 goto deliver; 255 } else { 256 sc->in_state = MIDI_IN_DATA; 257 sc->in_msg[0] = sc->in_status = data; 258 sc->in_pos = 1; 259 sc->in_left = MIDI_LENGTH(sc->in_status); 260 } 261 break; 262 } 263 } else { 264 if (MIDI_IS_STATUS(sc->in_status)) { 265 sc->in_state = MIDI_IN_DATA; 266 sc->in_msg[0] = sc->in_status; 267 sc->in_msg[1] = data; 268 sc->in_pos = 2; 269 sc->in_left = MIDI_LENGTH(sc->in_status) - 1; 270 } 271 } 272 return; 273 case MIDI_IN_DATA: 274 sc->in_msg[sc->in_pos++] = data; 275 if (--sc->in_left <= 0) 276 break; /* deliver data */ 277 return; 278 case MIDI_IN_SYSEX: 279 if (data == MIDI_SYSEX_END) 280 sc->in_state = MIDI_IN_START; 281 return; 282 } 283 deliver: 284 sc->in_state = MIDI_IN_START; 285 #if NSEQUENCER > 0 286 if (sc->seqopen) { 287 extern void midiseq_in __P((struct midi_softc *,u_char *,int)); 288 midiseq_in(sc, sc->in_msg, sc->in_pos); 289 return; 290 } 291 #endif 292 293 if (mb->used + sc->in_pos > mb->usedhigh) { 294 DPRINTF(("midi_in: buffer full, discard data=0x%02x\n", 295 sc->in_msg[0])); 296 return; 297 } 298 for (i = 0; i < sc->in_pos; i++) { 299 *mb->inp++ = sc->in_msg[i]; 300 if (mb->inp >= mb->end) 301 mb->inp = mb->start; 302 mb->used++; 303 } 304 midi_wakeup(&sc->rchan); 305 selwakeup(&sc->rsel); 306 if (sc->async) 307 psignal(sc->async, SIGIO); 308 } 309 310 void 311 midi_out(addr) 312 void *addr; 313 { 314 struct midi_softc *sc = addr; 315 DPRINTFN(3, ("midi_out: %p\n", sc)); 316 midi_start_output(sc, 1); 317 } 318 319 int 320 midiopen(dev, flags, ifmt, p) 321 dev_t dev; 322 int flags, ifmt; 323 struct proc *p; 324 { 325 int unit = MIDIUNIT(dev); 326 struct midi_softc *sc; 327 struct midi_hw_if *hw; 328 int error; 329 330 if (unit >= midi_cd.cd_ndevs || 331 (sc = midi_cd.cd_devs[unit]) == NULL) 332 return ENXIO; 333 DPRINTF(("midiopen %p\n", sc)); 334 335 hw = sc->hw_if; 336 if (!hw) 337 return ENXIO; 338 if (sc->isopen) 339 return EBUSY; 340 sc->in_state = MIDI_IN_START; 341 sc->in_status = 0; 342 error = hw->open(sc->hw_hdl, flags, midi_in, midi_out, sc); 343 if (error) 344 return error; 345 sc->isopen++; 346 sc->flags = flags; 347 sc->rchan = 0; 348 sc->wchan = 0; 349 sc->pbus = 0; 350 sc->async = 0; 351 352 return 0; 353 } 354 355 int 356 midiclose(dev, flags, ifmt, p) 357 dev_t dev; 358 int flags, ifmt; 359 struct proc *p; 360 { 361 int unit = MIDIUNIT(dev); 362 struct midi_softc *sc = midi_cd.cd_devs[unit]; 363 struct midi_hw_if *hw = sc->hw_if; 364 int s, error; 365 366 DPRINTF(("midiclose %p\n", sc)); 367 368 midi_start_output(sc, 0); 369 error = 0; 370 s = splaudio(); 371 while (sc->outbuf.used > 0 && !error) { 372 DPRINTFN(2,("midiclose sleep used=%d\n", sc->outbuf.used)); 373 error = midi_sleep_timo(&sc->wchan, "mid dr", 10*hz); 374 } 375 splx(s); 376 hw->close(sc->hw_hdl); 377 sc->isopen = 0; 378 #if NSEQUENCER > 0 379 sc->seqopen = 0; 380 #endif 381 return 0; 382 } 383 384 int 385 midiread(dev, uio, ioflag) 386 dev_t dev; 387 struct uio *uio; 388 int ioflag; 389 { 390 int unit = MIDIUNIT(dev); 391 struct midi_softc *sc = midi_cd.cd_devs[unit]; 392 struct midi_buffer *mb = &sc->inbuf; 393 int error; 394 u_char *outp; 395 int used, cc, n, resid; 396 int s; 397 398 DPRINTF(("midiread: %p, count=%d\n", sc, uio->uio_resid)); 399 400 error = 0; 401 resid = uio->uio_resid; 402 while (uio->uio_resid == resid && !error) { 403 s = splaudio(); 404 while (mb->used <= 0) { 405 if (ioflag & IO_NDELAY) { 406 splx(s); 407 return EWOULDBLOCK; 408 } 409 error = midi_sleep(&sc->rchan, "mid rd"); 410 if (error) { 411 splx(s); 412 return error; 413 } 414 } 415 used = mb->used; 416 outp = mb->outp; 417 splx(s); 418 cc = used; /* maximum to read */ 419 n = mb->end - outp; 420 if (n < cc) 421 cc = n; /* don't read beyond end of buffer */ 422 if (uio->uio_resid < cc) 423 cc = uio->uio_resid; /* and no more than we want */ 424 DPRINTFN(3, ("midiread: uiomove cc=%d\n", cc)); 425 error = uiomove(outp, cc, uio); 426 if (error) 427 break; 428 used -= cc; 429 outp += cc; 430 if (outp >= mb->end) 431 outp = mb->start; 432 s = splaudio(); 433 mb->outp = outp; 434 mb->used = used; 435 splx(s); 436 } 437 return error; 438 } 439 440 void 441 midi_timeout(arg) 442 void *arg; 443 { 444 struct midi_softc *sc = arg; 445 446 DPRINTFN(3,("midi_timeout: %p\n", sc)); 447 midi_start_output(sc, 1); 448 } 449 450 int 451 midi_start_output(sc, intr) 452 struct midi_softc *sc; 453 int intr; 454 { 455 struct midi_buffer *mb = &sc->outbuf; 456 u_char *outp; 457 int error; 458 int s; 459 int i, mmax; 460 461 error = 0; 462 mmax = sc->props & MIDI_PROP_OUT_INTR ? 1 : MIDI_MAX_WRITE; 463 s = splaudio(); 464 if (sc->pbus && !intr) { 465 DPRINTFN(4, ("midi_start_output: busy\n")); 466 splx(s); 467 return 0; 468 } 469 sc->pbus = 1; 470 for (i = 0; i < mmax && mb->used > 0 && !error; i++) { 471 outp = mb->outp; 472 splx(s); 473 DPRINTFN(4, ("midi_start_output: %p i=%d, data=0x%02x\n", 474 sc, i, *outp)); 475 error = sc->hw_if->output(sc->hw_hdl, *outp++); 476 if (outp >= mb->end) 477 outp = mb->start; 478 s = splaudio(); 479 mb->outp = outp; 480 mb->used--; 481 } 482 midi_wakeup(&sc->wchan); 483 selwakeup(&sc->wsel); 484 if (sc->async) 485 psignal(sc->async, SIGIO); 486 if (mb->used > 0) { 487 if (!(sc->props & MIDI_PROP_OUT_INTR)) 488 timeout(midi_timeout, sc, midi_wait); 489 } else 490 sc->pbus = 0; 491 splx(s); 492 return error; 493 } 494 495 int 496 midiwrite(dev, uio, ioflag) 497 dev_t dev; 498 struct uio *uio; 499 int ioflag; 500 { 501 int unit = MIDIUNIT(dev); 502 struct midi_softc *sc = midi_cd.cd_devs[unit]; 503 struct midi_buffer *mb = &sc->outbuf; 504 int error; 505 u_char *inp; 506 int used, cc, n; 507 int s; 508 509 DPRINTFN(2, ("midiwrite: %p, unit=%d, count=%d\n", sc, unit, 510 uio->uio_resid)); 511 512 error = 0; 513 while (uio->uio_resid > 0 && !error) { 514 s = splaudio(); 515 if (mb->used >= mb->usedhigh) { 516 DPRINTFN(3,("midi_write: sleep used=%d hiwat=%d\n", 517 mb->used, mb->usedhigh)); 518 if (ioflag & IO_NDELAY) { 519 splx(s); 520 return EWOULDBLOCK; 521 } 522 error = midi_sleep(&sc->wchan, "mid wr"); 523 if (error) { 524 splx(s); 525 return error; 526 } 527 } 528 used = mb->used; 529 inp = mb->inp; 530 splx(s); 531 cc = mb->usedhigh - used; /* maximum to write */ 532 n = mb->end - inp; 533 if (n < cc) 534 cc = n; /* don't write beyond end of buffer */ 535 if (uio->uio_resid < cc) 536 cc = uio->uio_resid; /* and no more than we have */ 537 error = uiomove(inp, cc, uio); 538 #ifdef MIDI_DEBUG 539 if (error) 540 printf("midi_write:(1) uiomove failed %d; cc=%d inp=%p\n", 541 error, cc, inp); 542 #endif 543 if (error) 544 break; 545 inp = mb->inp + cc; 546 if (inp >= mb->end) 547 inp = mb->start; 548 s = splaudio(); 549 mb->inp = inp; 550 mb->used += cc; 551 splx(s); 552 error = midi_start_output(sc, 0); 553 } 554 return error; 555 } 556 557 int 558 midiioctl(dev, cmd, addr, flag, p) 559 dev_t dev; 560 u_long cmd; 561 caddr_t addr; 562 int flag; 563 struct proc *p; 564 { 565 int unit = MIDIUNIT(dev); 566 struct midi_softc *sc = midi_cd.cd_devs[unit]; 567 struct midi_hw_if *hw = sc->hw_if; 568 int error; 569 570 DPRINTF(("midiioctl: %p cmd=0x%08lx\n", sc, cmd)); 571 error = 0; 572 switch (cmd) { 573 case FIONBIO: 574 /* All handled in the upper FS layer. */ 575 break; 576 577 case FIOASYNC: 578 if (*(int *)addr) { 579 if (sc->async) 580 return EBUSY; 581 sc->async = p; 582 DPRINTF(("midi_ioctl: FIOASYNC %p\n", p)); 583 } else 584 sc->async = 0; 585 break; 586 587 #if 0 588 case MIDI_PRETIME: 589 /* XXX OSS 590 * This should set up a read timeout, but that's 591 * why we have poll(), so there's nothing yet. */ 592 error = EINVAL; 593 break; 594 #endif 595 596 default: 597 if (hw->ioctl) 598 error = hw->ioctl(sc->hw_hdl, cmd, addr, flag, p); 599 else 600 error = EINVAL; 601 break; 602 } 603 return error; 604 } 605 606 int 607 midipoll(dev, events, p) 608 dev_t dev; 609 int events; 610 struct proc *p; 611 { 612 int unit = MIDIUNIT(dev); 613 struct midi_softc *sc = midi_cd.cd_devs[unit]; 614 int revents = 0; 615 int s = splaudio(); 616 617 DPRINTF(("midipoll: %p events=0x%x\n", sc, events)); 618 619 if (events & (POLLIN | POLLRDNORM)) 620 if (sc->inbuf.used > 0) 621 revents |= events & (POLLIN | POLLRDNORM); 622 623 if (events & (POLLOUT | POLLWRNORM)) 624 if (sc->outbuf.used < sc->outbuf.usedhigh) 625 revents |= events & (POLLOUT | POLLWRNORM); 626 627 if (revents == 0) { 628 if (events & (POLLIN | POLLRDNORM)) 629 selrecord(p, &sc->rsel); 630 631 if (events & (POLLOUT | POLLWRNORM)) 632 selrecord(p, &sc->wsel); 633 } 634 635 splx(s); 636 return revents; 637 } 638 639 void 640 midi_getinfo(dev, mi) 641 dev_t dev; 642 struct midi_info *mi; 643 { 644 int unit = MIDIUNIT(dev); 645 struct midi_softc *sc; 646 647 if (unit >= midi_cd.cd_ndevs || 648 (sc = midi_cd.cd_devs[unit]) == NULL) 649 return; 650 sc->hw_if->getinfo(sc->hw_hdl, mi); 651 } 652 653 #endif /* NMIDI > 0 */ 654
Indexes created Sun Sep 28 07:09:56 GMT 2025