Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/dev/sound/midi/midi.c
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1 /*- 2 * Copyright (c) 2003 Mathew Kanner 3 * Copyright (c) 1998 The NetBSD Foundation, Inc. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to The NetBSD Foundation 7 * by Lennart Augustsson (augustss@netbsd.org). 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 * 18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 /* 32 * Parts of this file started out as NetBSD: midi.c 1.31 33 * They are mostly gone. Still the most obvious will be the state 34 * machine midi_in 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/queue.h> 43 #include <sys/kernel.h> 44 #include <sys/lock.h> 45 #include <sys/mutex.h> 46 #include <sys/proc.h> 47 #include <sys/signalvar.h> 48 #include <sys/conf.h> 49 #include <sys/selinfo.h> 50 #include <sys/sysctl.h> 51 #include <sys/malloc.h> 52 #include <sys/sx.h> 53 #include <sys/proc.h> 54 #include <sys/fcntl.h> 55 #include <sys/types.h> 56 #include <sys/uio.h> 57 #include <sys/poll.h> 58 #include <sys/sbuf.h> 59 #include <sys/kobj.h> 60 #include <sys/module.h> 61 62 #ifdef HAVE_KERNEL_OPTION_HEADERS 63 #include "opt_snd.h" 64 #endif 65 66 #include <dev/sound/midi/midi.h> 67 #include "mpu_if.h" 68 69 #include <dev/sound/midi/midiq.h> 70 #include "synth_if.h" 71 MALLOC_DEFINE(M_MIDI, "midi buffers", "Midi data allocation area"); 72 73 #ifndef KOBJMETHOD_END 74 #define KOBJMETHOD_END { NULL, NULL } 75 #endif 76 77 #define PCMMKMINOR(u, d, c) ((((c) & 0xff) << 16) | (((u) & 0x0f) << 4) | ((d) & 0x0f)) 78 #define MIDIMKMINOR(u, d, c) PCMMKMINOR(u, d, c) 79 80 #define MIDI_DEV_RAW 2 81 #define MIDI_DEV_MIDICTL 12 82 83 enum midi_states { 84 MIDI_IN_START, MIDI_IN_SYSEX, MIDI_IN_DATA 85 }; 86 87 /* 88 * The MPU interface current has init() uninit() inqsize() outqsize() 89 * callback() : fiddle with the tx|rx status. 90 */ 91 92 #include "mpu_if.h" 93 94 /* 95 * /dev/rmidi Structure definitions 96 */ 97 98 #define MIDI_NAMELEN 16 99 struct snd_midi { 100 KOBJ_FIELDS; 101 struct mtx lock; /* Protects all but queues */ 102 void *cookie; 103 104 int unit; /* Should only be used in midistat */ 105 int channel; /* Should only be used in midistat */ 106 107 int busy; 108 int flags; /* File flags */ 109 char name[MIDI_NAMELEN]; 110 struct mtx qlock; /* Protects inq, outq and flags */ 111 MIDIQ_HEAD(, char) inq, outq; 112 int rchan, wchan; 113 struct selinfo rsel, wsel; 114 int hiwat; /* QLEN(outq)>High-water -> disable 115 * writes from userland */ 116 enum midi_states inq_state; 117 int inq_status, inq_left; /* Variables for the state machine in 118 * Midi_in, this is to provide that 119 * signals only get issued only 120 * complete command packets. */ 121 struct proc *async; 122 struct cdev *dev; 123 struct synth_midi *synth; 124 int synth_flags; 125 TAILQ_ENTRY(snd_midi) link; 126 }; 127 128 struct synth_midi { 129 KOBJ_FIELDS; 130 struct snd_midi *m; 131 }; 132 133 static synth_open_t midisynth_open; 134 static synth_close_t midisynth_close; 135 static synth_writeraw_t midisynth_writeraw; 136 static synth_killnote_t midisynth_killnote; 137 static synth_startnote_t midisynth_startnote; 138 static synth_setinstr_t midisynth_setinstr; 139 static synth_alloc_t midisynth_alloc; 140 static synth_controller_t midisynth_controller; 141 static synth_bender_t midisynth_bender; 142 143 144 static kobj_method_t midisynth_methods[] = { 145 KOBJMETHOD(synth_open, midisynth_open), 146 KOBJMETHOD(synth_close, midisynth_close), 147 KOBJMETHOD(synth_writeraw, midisynth_writeraw), 148 KOBJMETHOD(synth_setinstr, midisynth_setinstr), 149 KOBJMETHOD(synth_startnote, midisynth_startnote), 150 KOBJMETHOD(synth_killnote, midisynth_killnote), 151 KOBJMETHOD(synth_alloc, midisynth_alloc), 152 KOBJMETHOD(synth_controller, midisynth_controller), 153 KOBJMETHOD(synth_bender, midisynth_bender), 154 KOBJMETHOD_END 155 }; 156 157 DEFINE_CLASS(midisynth, midisynth_methods, 0); 158 159 /* 160 * Module Exports & Interface 161 * 162 * struct midi_chan *midi_init(MPU_CLASS cls, int unit, int chan, 163 * void *cookie) 164 * int midi_uninit(struct snd_midi *) 165 * 166 * 0 == no error 167 * EBUSY or other error 168 * 169 * int midi_in(struct snd_midi *, char *buf, int count) 170 * int midi_out(struct snd_midi *, char *buf, int count) 171 * 172 * midi_{in,out} return actual size transfered 173 * 174 */ 175 176 177 /* 178 * midi_devs tailq, holder of all rmidi instances protected by midistat_lock 179 */ 180 181 TAILQ_HEAD(, snd_midi) midi_devs; 182 183 /* 184 * /dev/midistat variables and declarations, protected by midistat_lock 185 */ 186 187 static struct sx midistat_lock; 188 static int midistat_isopen = 0; 189 static struct sbuf midistat_sbuf; 190 static struct cdev *midistat_dev; 191 192 /* 193 * /dev/midistat dev_t declarations 194 */ 195 196 static d_open_t midistat_open; 197 static d_close_t midistat_close; 198 static d_read_t midistat_read; 199 200 static struct cdevsw midistat_cdevsw = { 201 .d_version = D_VERSION, 202 .d_open = midistat_open, 203 .d_close = midistat_close, 204 .d_read = midistat_read, 205 .d_name = "midistat", 206 }; 207 208 209 /* 210 * /dev/rmidi dev_t declarations, struct variable access is protected by 211 * locks contained within the structure. 212 */ 213 214 static d_open_t midi_open; 215 static d_close_t midi_close; 216 static d_ioctl_t midi_ioctl; 217 static d_read_t midi_read; 218 static d_write_t midi_write; 219 static d_poll_t midi_poll; 220 221 static struct cdevsw midi_cdevsw = { 222 .d_version = D_VERSION, 223 .d_open = midi_open, 224 .d_close = midi_close, 225 .d_read = midi_read, 226 .d_write = midi_write, 227 .d_ioctl = midi_ioctl, 228 .d_poll = midi_poll, 229 .d_name = "rmidi", 230 }; 231 232 /* 233 * Prototypes of library functions 234 */ 235 236 static int midi_destroy(struct snd_midi *, int); 237 static int midistat_prepare(struct sbuf * s); 238 static int midi_load(void); 239 static int midi_unload(void); 240 241 /* 242 * Misc declr. 243 */ 244 SYSCTL_NODE(_hw, OID_AUTO, midi, CTLFLAG_RD, 0, "Midi driver"); 245 static SYSCTL_NODE(_hw_midi, OID_AUTO, stat, CTLFLAG_RD, 0, "Status device"); 246 247 int midi_debug; 248 /* XXX: should this be moved into debug.midi? */ 249 SYSCTL_INT(_hw_midi, OID_AUTO, debug, CTLFLAG_RW, &midi_debug, 0, ""); 250 251 int midi_dumpraw; 252 SYSCTL_INT(_hw_midi, OID_AUTO, dumpraw, CTLFLAG_RW, &midi_dumpraw, 0, ""); 253 254 int midi_instroff; 255 SYSCTL_INT(_hw_midi, OID_AUTO, instroff, CTLFLAG_RW, &midi_instroff, 0, ""); 256 257 int midistat_verbose; 258 SYSCTL_INT(_hw_midi_stat, OID_AUTO, verbose, CTLFLAG_RW, 259 &midistat_verbose, 0, ""); 260 261 #define MIDI_DEBUG(l,a) if(midi_debug>=l) a 262 /* 263 * CODE START 264 */ 265 266 /* 267 * Register a new rmidi device. cls midi_if interface unit == 0 means 268 * auto-assign new unit number unit != 0 already assigned a unit number, eg. 269 * not the first channel provided by this device. channel, sub-unit 270 * cookie is passed back on MPU calls Typical device drivers will call with 271 * unit=0, channel=1..(number of channels) and cookie=soft_c and won't care 272 * what unit number is used. 273 * 274 * It is an error to call midi_init with an already used unit/channel combo. 275 * 276 * Returns NULL on error 277 * 278 */ 279 struct snd_midi * 280 midi_init(kobj_class_t cls, int unit, int channel, void *cookie) 281 { 282 struct snd_midi *m; 283 int i; 284 int inqsize, outqsize; 285 MIDI_TYPE *buf; 286 287 MIDI_DEBUG(1, printf("midiinit: unit %d/%d.\n", unit, channel)); 288 sx_xlock(&midistat_lock); 289 /* 290 * Protect against call with existing unit/channel or auto-allocate a 291 * new unit number. 292 */ 293 i = -1; 294 TAILQ_FOREACH(m, &midi_devs, link) { 295 mtx_lock(&m->lock); 296 if (unit != 0) { 297 if (m->unit == unit && m->channel == channel) { 298 mtx_unlock(&m->lock); 299 goto err0; 300 } 301 } else { 302 /* 303 * Find a better unit number 304 */ 305 if (m->unit > i) 306 i = m->unit; 307 } 308 mtx_unlock(&m->lock); 309 } 310 311 if (unit == 0) 312 unit = i + 1; 313 314 MIDI_DEBUG(1, printf("midiinit #2: unit %d/%d.\n", unit, channel)); 315 m = malloc(sizeof(*m), M_MIDI, M_WAITOK | M_ZERO); 316 m->synth = malloc(sizeof(*m->synth), M_MIDI, M_WAITOK | M_ZERO); 317 kobj_init((kobj_t)m->synth, &midisynth_class); 318 m->synth->m = m; 319 kobj_init((kobj_t)m, cls); 320 inqsize = MPU_INQSIZE(m, cookie); 321 outqsize = MPU_OUTQSIZE(m, cookie); 322 323 MIDI_DEBUG(1, printf("midiinit queues %d/%d.\n", inqsize, outqsize)); 324 if (!inqsize && !outqsize) 325 goto err1; 326 327 mtx_init(&m->lock, "raw midi", NULL, 0); 328 mtx_init(&m->qlock, "q raw midi", NULL, 0); 329 330 mtx_lock(&m->lock); 331 mtx_lock(&m->qlock); 332 333 if (inqsize) 334 buf = malloc(sizeof(MIDI_TYPE) * inqsize, M_MIDI, M_NOWAIT); 335 else 336 buf = NULL; 337 338 MIDIQ_INIT(m->inq, buf, inqsize); 339 340 if (outqsize) 341 buf = malloc(sizeof(MIDI_TYPE) * outqsize, M_MIDI, M_NOWAIT); 342 else 343 buf = NULL; 344 m->hiwat = outqsize / 2; 345 346 MIDIQ_INIT(m->outq, buf, outqsize); 347 348 if ((inqsize && !MIDIQ_BUF(m->inq)) || 349 (outqsize && !MIDIQ_BUF(m->outq))) 350 goto err2; 351 352 m->busy = 0; 353 m->flags = 0; 354 m->unit = unit; 355 m->channel = channel; 356 m->cookie = cookie; 357 358 if (MPU_INIT(m, cookie)) 359 goto err2; 360 361 mtx_unlock(&m->lock); 362 mtx_unlock(&m->qlock); 363 364 TAILQ_INSERT_TAIL(&midi_devs, m, link); 365 366 sx_xunlock(&midistat_lock); 367 368 m->dev = make_dev(&midi_cdevsw, 369 MIDIMKMINOR(unit, MIDI_DEV_RAW, channel), 370 UID_ROOT, GID_WHEEL, 0666, "midi%d.%d", unit, channel); 371 m->dev->si_drv1 = m; 372 373 return m; 374 375 err2: 376 mtx_destroy(&m->qlock); 377 mtx_destroy(&m->lock); 378 379 if (MIDIQ_BUF(m->inq)) 380 free(MIDIQ_BUF(m->inq), M_MIDI); 381 if (MIDIQ_BUF(m->outq)) 382 free(MIDIQ_BUF(m->outq), M_MIDI); 383 err1: 384 free(m->synth, M_MIDI); 385 free(m, M_MIDI); 386 err0: 387 sx_xunlock(&midistat_lock); 388 MIDI_DEBUG(1, printf("midi_init ended in error\n")); 389 return NULL; 390 } 391 392 /* 393 * midi_uninit does not call MIDI_UNINIT, as since this is the implementors 394 * entry point. midi_uninit if fact, does not send any methods. A call to 395 * midi_uninit is a defacto promise that you won't manipulate ch anymore 396 * 397 */ 398 399 int 400 midi_uninit(struct snd_midi *m) 401 { 402 int err; 403 404 err = EBUSY; 405 sx_xlock(&midistat_lock); 406 mtx_lock(&m->lock); 407 if (m->busy) { 408 if (!(m->rchan || m->wchan)) 409 goto err; 410 411 if (m->rchan) { 412 wakeup(&m->rchan); 413 m->rchan = 0; 414 } 415 if (m->wchan) { 416 wakeup(&m->wchan); 417 m->wchan = 0; 418 } 419 } 420 err = midi_destroy(m, 0); 421 if (!err) 422 goto exit; 423 424 err: 425 mtx_unlock(&m->lock); 426 exit: 427 sx_xunlock(&midistat_lock); 428 return err; 429 } 430 431 /* 432 * midi_in: process all data until the queue is full, then discards the rest. 433 * Since midi_in is a state machine, data discards can cause it to get out of 434 * whack. Process as much as possible. It calls, wakeup, selnotify and 435 * psignal at most once. 436 */ 437 438 #ifdef notdef 439 static int midi_lengths[] = {2, 2, 2, 2, 1, 1, 2, 0}; 440 441 #endif /* notdef */ 442 /* Number of bytes in a MIDI command */ 443 #define MIDI_LENGTH(d) (midi_lengths[((d) >> 4) & 7]) 444 #define MIDI_ACK 0xfe 445 #define MIDI_IS_STATUS(d) ((d) >= 0x80) 446 #define MIDI_IS_COMMON(d) ((d) >= 0xf0) 447 448 #define MIDI_SYSEX_START 0xF0 449 #define MIDI_SYSEX_END 0xF7 450 451 452 int 453 midi_in(struct snd_midi *m, MIDI_TYPE *buf, int size) 454 { 455 /* int i, sig, enq; */ 456 int used; 457 458 /* MIDI_TYPE data; */ 459 MIDI_DEBUG(5, printf("midi_in: m=%p size=%d\n", m, size)); 460 461 /* 462 * XXX: locking flub 463 */ 464 if (!(m->flags & M_RX)) 465 return size; 466 467 used = 0; 468 469 mtx_lock(&m->qlock); 470 #if 0 471 /* 472 * Don't bother queuing if not in read mode. Discard everything and 473 * return size so the caller doesn't freak out. 474 */ 475 476 if (!(m->flags & M_RX)) 477 return size; 478 479 for (i = sig = 0; i < size; i++) { 480 481 data = buf[i]; 482 enq = 0; 483 if (data == MIDI_ACK) 484 continue; 485 486 switch (m->inq_state) { 487 case MIDI_IN_START: 488 if (MIDI_IS_STATUS(data)) { 489 switch (data) { 490 case 0xf0: /* Sysex */ 491 m->inq_state = MIDI_IN_SYSEX; 492 break; 493 case 0xf1: /* MTC quarter frame */ 494 case 0xf3: /* Song select */ 495 m->inq_state = MIDI_IN_DATA; 496 enq = 1; 497 m->inq_left = 1; 498 break; 499 case 0xf2: /* Song position pointer */ 500 m->inq_state = MIDI_IN_DATA; 501 enq = 1; 502 m->inq_left = 2; 503 break; 504 default: 505 if (MIDI_IS_COMMON(data)) { 506 enq = 1; 507 sig = 1; 508 } else { 509 m->inq_state = MIDI_IN_DATA; 510 enq = 1; 511 m->inq_status = data; 512 m->inq_left = MIDI_LENGTH(data); 513 } 514 break; 515 } 516 } else if (MIDI_IS_STATUS(m->inq_status)) { 517 m->inq_state = MIDI_IN_DATA; 518 if (!MIDIQ_FULL(m->inq)) { 519 used++; 520 MIDIQ_ENQ(m->inq, &m->inq_status, 1); 521 } 522 enq = 1; 523 m->inq_left = MIDI_LENGTH(m->inq_status) - 1; 524 } 525 break; 526 /* 527 * End of case MIDI_IN_START: 528 */ 529 530 case MIDI_IN_DATA: 531 enq = 1; 532 if (--m->inq_left <= 0) 533 sig = 1;/* deliver data */ 534 break; 535 case MIDI_IN_SYSEX: 536 if (data == MIDI_SYSEX_END) 537 m->inq_state = MIDI_IN_START; 538 break; 539 } 540 541 if (enq) 542 if (!MIDIQ_FULL(m->inq)) { 543 MIDIQ_ENQ(m->inq, &data, 1); 544 used++; 545 } 546 /* 547 * End of the state machines main "for loop" 548 */ 549 } 550 if (sig) { 551 #endif 552 MIDI_DEBUG(6, printf("midi_in: len %jd avail %jd\n", 553 (intmax_t)MIDIQ_LEN(m->inq), 554 (intmax_t)MIDIQ_AVAIL(m->inq))); 555 if (MIDIQ_AVAIL(m->inq) > size) { 556 used = size; 557 MIDIQ_ENQ(m->inq, buf, size); 558 } else { 559 MIDI_DEBUG(4, printf("midi_in: Discarding data qu\n")); 560 mtx_unlock(&m->qlock); 561 return 0; 562 } 563 if (m->rchan) { 564 wakeup(&m->rchan); 565 m->rchan = 0; 566 } 567 selwakeup(&m->rsel); 568 if (m->async) { 569 PROC_LOCK(m->async); 570 kern_psignal(m->async, SIGIO); 571 PROC_UNLOCK(m->async); 572 } 573 #if 0 574 } 575 #endif 576 mtx_unlock(&m->qlock); 577 return used; 578 } 579 580 /* 581 * midi_out: The only clearer of the M_TXEN flag. 582 */ 583 int 584 midi_out(struct snd_midi *m, MIDI_TYPE *buf, int size) 585 { 586 int used; 587 588 /* 589 * XXX: locking flub 590 */ 591 if (!(m->flags & M_TXEN)) 592 return 0; 593 594 MIDI_DEBUG(2, printf("midi_out: %p\n", m)); 595 mtx_lock(&m->qlock); 596 used = MIN(size, MIDIQ_LEN(m->outq)); 597 MIDI_DEBUG(3, printf("midi_out: used %d\n", used)); 598 if (used) 599 MIDIQ_DEQ(m->outq, buf, used); 600 if (MIDIQ_EMPTY(m->outq)) { 601 m->flags &= ~M_TXEN; 602 MPU_CALLBACKP(m, m->cookie, m->flags); 603 } 604 if (used && MIDIQ_AVAIL(m->outq) > m->hiwat) { 605 if (m->wchan) { 606 wakeup(&m->wchan); 607 m->wchan = 0; 608 } 609 selwakeup(&m->wsel); 610 if (m->async) { 611 PROC_LOCK(m->async); 612 kern_psignal(m->async, SIGIO); 613 PROC_UNLOCK(m->async); 614 } 615 } 616 mtx_unlock(&m->qlock); 617 return used; 618 } 619 620 621 /* 622 * /dev/rmidi#.# device access functions 623 */ 624 int 625 midi_open(struct cdev *i_dev, int flags, int mode, struct thread *td) 626 { 627 struct snd_midi *m = i_dev->si_drv1; 628 int retval; 629 630 MIDI_DEBUG(1, printf("midiopen %p %s %s\n", td, 631 flags & FREAD ? "M_RX" : "", flags & FWRITE ? "M_TX" : "")); 632 if (m == NULL) 633 return ENXIO; 634 635 mtx_lock(&m->lock); 636 mtx_lock(&m->qlock); 637 638 retval = 0; 639 640 if (flags & FREAD) { 641 if (MIDIQ_SIZE(m->inq) == 0) 642 retval = ENXIO; 643 else if (m->flags & M_RX) 644 retval = EBUSY; 645 if (retval) 646 goto err; 647 } 648 if (flags & FWRITE) { 649 if (MIDIQ_SIZE(m->outq) == 0) 650 retval = ENXIO; 651 else if (m->flags & M_TX) 652 retval = EBUSY; 653 if (retval) 654 goto err; 655 } 656 m->busy++; 657 658 m->rchan = 0; 659 m->wchan = 0; 660 m->async = 0; 661 662 if (flags & FREAD) { 663 m->flags |= M_RX | M_RXEN; 664 /* 665 * Only clear the inq, the outq might still have data to drain 666 * from a previous session 667 */ 668 MIDIQ_CLEAR(m->inq); 669 } 670 671 if (flags & FWRITE) 672 m->flags |= M_TX; 673 674 MPU_CALLBACK(m, m->cookie, m->flags); 675 676 MIDI_DEBUG(2, printf("midi_open: opened.\n")); 677 678 err: mtx_unlock(&m->qlock); 679 mtx_unlock(&m->lock); 680 return retval; 681 } 682 683 int 684 midi_close(struct cdev *i_dev, int flags, int mode, struct thread *td) 685 { 686 struct snd_midi *m = i_dev->si_drv1; 687 int retval; 688 int oldflags; 689 690 MIDI_DEBUG(1, printf("midi_close %p %s %s\n", td, 691 flags & FREAD ? "M_RX" : "", flags & FWRITE ? "M_TX" : "")); 692 693 if (m == NULL) 694 return ENXIO; 695 696 mtx_lock(&m->lock); 697 mtx_lock(&m->qlock); 698 699 if ((flags & FREAD && !(m->flags & M_RX)) || 700 (flags & FWRITE && !(m->flags & M_TX))) { 701 retval = ENXIO; 702 goto err; 703 } 704 m->busy--; 705 706 oldflags = m->flags; 707 708 if (flags & FREAD) 709 m->flags &= ~(M_RX | M_RXEN); 710 if (flags & FWRITE) 711 m->flags &= ~M_TX; 712 713 if ((m->flags & (M_TXEN | M_RXEN)) != (oldflags & (M_RXEN | M_TXEN))) 714 MPU_CALLBACK(m, m->cookie, m->flags); 715 716 MIDI_DEBUG(1, printf("midi_close: closed, busy = %d.\n", m->busy)); 717 718 mtx_unlock(&m->qlock); 719 mtx_unlock(&m->lock); 720 retval = 0; 721 err: return retval; 722 } 723 724 /* 725 * TODO: midi_read, per oss programmer's guide pg. 42 should return as soon 726 * as data is available. 727 */ 728 int 729 midi_read(struct cdev *i_dev, struct uio *uio, int ioflag) 730 { 731 #define MIDI_RSIZE 32 732 struct snd_midi *m = i_dev->si_drv1; 733 int retval; 734 int used; 735 char buf[MIDI_RSIZE]; 736 737 MIDI_DEBUG(5, printf("midiread: count=%lu\n", 738 (unsigned long)uio->uio_resid)); 739 740 retval = EIO; 741 742 if (m == NULL) 743 goto err0; 744 745 mtx_lock(&m->lock); 746 mtx_lock(&m->qlock); 747 748 if (!(m->flags & M_RX)) 749 goto err1; 750 751 while (uio->uio_resid > 0) { 752 while (MIDIQ_EMPTY(m->inq)) { 753 retval = EWOULDBLOCK; 754 if (ioflag & O_NONBLOCK) 755 goto err1; 756 mtx_unlock(&m->lock); 757 m->rchan = 1; 758 retval = msleep(&m->rchan, &m->qlock, 759 PCATCH | PDROP, "midi RX", 0); 760 /* 761 * We slept, maybe things have changed since last 762 * dying check 763 */ 764 if (retval == EINTR) 765 goto err0; 766 if (m != i_dev->si_drv1) 767 retval = ENXIO; 768 /* if (retval && retval != ERESTART) */ 769 if (retval) 770 goto err0; 771 mtx_lock(&m->lock); 772 mtx_lock(&m->qlock); 773 m->rchan = 0; 774 if (!m->busy) 775 goto err1; 776 } 777 MIDI_DEBUG(6, printf("midi_read start\n")); 778 /* 779 * At this point, it is certain that m->inq has data 780 */ 781 782 used = MIN(MIDIQ_LEN(m->inq), uio->uio_resid); 783 used = MIN(used, MIDI_RSIZE); 784 785 MIDI_DEBUG(6, printf("midiread: uiomove cc=%d\n", used)); 786 MIDIQ_DEQ(m->inq, buf, used); 787 retval = uiomove(buf, used, uio); 788 if (retval) 789 goto err1; 790 } 791 792 /* 793 * If we Made it here then transfer is good 794 */ 795 retval = 0; 796 err1: mtx_unlock(&m->qlock); 797 mtx_unlock(&m->lock); 798 err0: MIDI_DEBUG(4, printf("midi_read: ret %d\n", retval)); 799 return retval; 800 } 801 802 /* 803 * midi_write: The only setter of M_TXEN 804 */ 805 806 int 807 midi_write(struct cdev *i_dev, struct uio *uio, int ioflag) 808 { 809 #define MIDI_WSIZE 32 810 struct snd_midi *m = i_dev->si_drv1; 811 int retval; 812 int used; 813 char buf[MIDI_WSIZE]; 814 815 816 MIDI_DEBUG(4, printf("midi_write\n")); 817 retval = 0; 818 if (m == NULL) 819 goto err0; 820 821 mtx_lock(&m->lock); 822 mtx_lock(&m->qlock); 823 824 if (!(m->flags & M_TX)) 825 goto err1; 826 827 while (uio->uio_resid > 0) { 828 while (MIDIQ_AVAIL(m->outq) == 0) { 829 retval = EWOULDBLOCK; 830 if (ioflag & O_NONBLOCK) 831 goto err1; 832 mtx_unlock(&m->lock); 833 m->wchan = 1; 834 MIDI_DEBUG(3, printf("midi_write msleep\n")); 835 retval = msleep(&m->wchan, &m->qlock, 836 PCATCH | PDROP, "midi TX", 0); 837 /* 838 * We slept, maybe things have changed since last 839 * dying check 840 */ 841 if (retval == EINTR) 842 goto err0; 843 if (m != i_dev->si_drv1) 844 retval = ENXIO; 845 if (retval) 846 goto err0; 847 mtx_lock(&m->lock); 848 mtx_lock(&m->qlock); 849 m->wchan = 0; 850 if (!m->busy) 851 goto err1; 852 } 853 854 /* 855 * We are certain than data can be placed on the queue 856 */ 857 858 used = MIN(MIDIQ_AVAIL(m->outq), uio->uio_resid); 859 used = MIN(used, MIDI_WSIZE); 860 MIDI_DEBUG(5, printf("midiout: resid %zd len %jd avail %jd\n", 861 uio->uio_resid, (intmax_t)MIDIQ_LEN(m->outq), 862 (intmax_t)MIDIQ_AVAIL(m->outq))); 863 864 865 MIDI_DEBUG(5, printf("midi_write: uiomove cc=%d\n", used)); 866 retval = uiomove(buf, used, uio); 867 if (retval) 868 goto err1; 869 MIDIQ_ENQ(m->outq, buf, used); 870 /* 871 * Inform the bottom half that data can be written 872 */ 873 if (!(m->flags & M_TXEN)) { 874 m->flags |= M_TXEN; 875 MPU_CALLBACK(m, m->cookie, m->flags); 876 } 877 } 878 /* 879 * If we Made it here then transfer is good 880 */ 881 retval = 0; 882 err1: mtx_unlock(&m->qlock); 883 mtx_unlock(&m->lock); 884 err0: return retval; 885 } 886 887 int 888 midi_ioctl(struct cdev *i_dev, u_long cmd, caddr_t arg, int mode, 889 struct thread *td) 890 { 891 return ENXIO; 892 } 893 894 int 895 midi_poll(struct cdev *i_dev, int events, struct thread *td) 896 { 897 struct snd_midi *m = i_dev->si_drv1; 898 int revents; 899 900 if (m == NULL) 901 return 0; 902 903 revents = 0; 904 905 mtx_lock(&m->lock); 906 mtx_lock(&m->qlock); 907 908 if (events & (POLLIN | POLLRDNORM)) 909 if (!MIDIQ_EMPTY(m->inq)) 910 events |= events & (POLLIN | POLLRDNORM); 911 912 if (events & (POLLOUT | POLLWRNORM)) 913 if (MIDIQ_AVAIL(m->outq) < m->hiwat) 914 events |= events & (POLLOUT | POLLWRNORM); 915 916 if (revents == 0) { 917 if (events & (POLLIN | POLLRDNORM)) 918 selrecord(td, &m->rsel); 919 920 if (events & (POLLOUT | POLLWRNORM)) 921 selrecord(td, &m->wsel); 922 } 923 mtx_unlock(&m->lock); 924 mtx_unlock(&m->qlock); 925 926 return (revents); 927 } 928 929 /* 930 * /dev/midistat device functions 931 * 932 */ 933 static int 934 midistat_open(struct cdev *i_dev, int flags, int mode, struct thread *td) 935 { 936 int error; 937 938 MIDI_DEBUG(1, printf("midistat_open\n")); 939 940 sx_xlock(&midistat_lock); 941 if (midistat_isopen) { 942 sx_xunlock(&midistat_lock); 943 return EBUSY; 944 } 945 midistat_isopen = 1; 946 if (sbuf_new(&midistat_sbuf, NULL, 4096, SBUF_AUTOEXTEND) == NULL) { 947 error = ENXIO; 948 goto out; 949 } 950 error = (midistat_prepare(&midistat_sbuf) > 0) ? 0 : ENOMEM; 951 out: 952 if (error) 953 midistat_isopen = 0; 954 sx_xunlock(&midistat_lock); 955 return error; 956 } 957 958 static int 959 midistat_close(struct cdev *i_dev, int flags, int mode, struct thread *td) 960 { 961 MIDI_DEBUG(1, printf("midistat_close\n")); 962 sx_xlock(&midistat_lock); 963 if (!midistat_isopen) { 964 sx_xunlock(&midistat_lock); 965 return EBADF; 966 } 967 sbuf_delete(&midistat_sbuf); 968 midistat_isopen = 0; 969 sx_xunlock(&midistat_lock); 970 return 0; 971 } 972 973 static int 974 midistat_read(struct cdev *i_dev, struct uio *uio, int flag) 975 { 976 long l; 977 int err; 978 979 MIDI_DEBUG(4, printf("midistat_read\n")); 980 sx_xlock(&midistat_lock); 981 if (!midistat_isopen) { 982 sx_xunlock(&midistat_lock); 983 return EBADF; 984 } 985 if (uio->uio_offset < 0 || uio->uio_offset > sbuf_len(&midistat_sbuf)) { 986 sx_xunlock(&midistat_lock); 987 return EINVAL; 988 } 989 err = 0; 990 l = lmin(uio->uio_resid, sbuf_len(&midistat_sbuf) - uio->uio_offset); 991 if (l > 0) { 992 err = uiomove(sbuf_data(&midistat_sbuf) + uio->uio_offset, l, 993 uio); 994 } 995 sx_xunlock(&midistat_lock); 996 return err; 997 } 998 999 /* 1000 * Module library functions 1001 */ 1002 1003 static int 1004 midistat_prepare(struct sbuf *s) 1005 { 1006 struct snd_midi *m; 1007 1008 sx_assert(&midistat_lock, SA_XLOCKED); 1009 1010 sbuf_printf(s, "FreeBSD Midi Driver (midi2)\n"); 1011 if (TAILQ_EMPTY(&midi_devs)) { 1012 sbuf_printf(s, "No devices installed.\n"); 1013 sbuf_finish(s); 1014 return sbuf_len(s); 1015 } 1016 sbuf_printf(s, "Installed devices:\n"); 1017 1018 TAILQ_FOREACH(m, &midi_devs, link) { 1019 mtx_lock(&m->lock); 1020 sbuf_printf(s, "%s [%d/%d:%s]", m->name, m->unit, m->channel, 1021 MPU_PROVIDER(m, m->cookie)); 1022 sbuf_printf(s, "%s", MPU_DESCR(m, m->cookie, midistat_verbose)); 1023 sbuf_printf(s, "\n"); 1024 mtx_unlock(&m->lock); 1025 } 1026 1027 sbuf_finish(s); 1028 return sbuf_len(s); 1029 } 1030 1031 #ifdef notdef 1032 /* 1033 * Convert IOCTL command to string for debugging 1034 */ 1035 1036 static char * 1037 midi_cmdname(int cmd) 1038 { 1039 static struct { 1040 int cmd; 1041 char *name; 1042 } *tab, cmdtab_midiioctl[] = { 1043 #define A(x) {x, ## x} 1044 /* 1045 * Once we have some real IOCTLs define, the following will 1046 * be relavant. 1047 * 1048 * A(SNDCTL_MIDI_PRETIME), A(SNDCTL_MIDI_MPUMODE), 1049 * A(SNDCTL_MIDI_MPUCMD), A(SNDCTL_SYNTH_INFO), 1050 * A(SNDCTL_MIDI_INFO), A(SNDCTL_SYNTH_MEMAVL), 1051 * A(SNDCTL_FM_LOAD_INSTR), A(SNDCTL_FM_4OP_ENABLE), 1052 * A(MIOSPASSTHRU), A(MIOGPASSTHRU), A(AIONWRITE), 1053 * A(AIOGSIZE), A(AIOSSIZE), A(AIOGFMT), A(AIOSFMT), 1054 * A(AIOGMIX), A(AIOSMIX), A(AIOSTOP), A(AIOSYNC), 1055 * A(AIOGCAP), 1056 */ 1057 #undef A 1058 { 1059 -1, "unknown" 1060 }, 1061 }; 1062 1063 for (tab = cmdtab_midiioctl; tab->cmd != cmd && tab->cmd != -1; tab++); 1064 return tab->name; 1065 } 1066 1067 #endif /* notdef */ 1068 1069 /* 1070 * midisynth 1071 */ 1072 1073 1074 int 1075 midisynth_open(void *n, void *arg, int flags) 1076 { 1077 struct snd_midi *m = ((struct synth_midi *)n)->m; 1078 int retval; 1079 1080 MIDI_DEBUG(1, printf("midisynth_open %s %s\n", 1081 flags & FREAD ? "M_RX" : "", flags & FWRITE ? "M_TX" : "")); 1082 1083 if (m == NULL) 1084 return ENXIO; 1085 1086 mtx_lock(&m->lock); 1087 mtx_lock(&m->qlock); 1088 1089 retval = 0; 1090 1091 if (flags & FREAD) { 1092 if (MIDIQ_SIZE(m->inq) == 0) 1093 retval = ENXIO; 1094 else if (m->flags & M_RX) 1095 retval = EBUSY; 1096 if (retval) 1097 goto err; 1098 } 1099 if (flags & FWRITE) { 1100 if (MIDIQ_SIZE(m->outq) == 0) 1101 retval = ENXIO; 1102 else if (m->flags & M_TX) 1103 retval = EBUSY; 1104 if (retval) 1105 goto err; 1106 } 1107 m->busy++; 1108 1109 /* 1110 * TODO: Consider m->async = 0; 1111 */ 1112 1113 if (flags & FREAD) { 1114 m->flags |= M_RX | M_RXEN; 1115 /* 1116 * Only clear the inq, the outq might still have data to drain 1117 * from a previous session 1118 */ 1119 MIDIQ_CLEAR(m->inq); 1120 m->rchan = 0; 1121 } 1122 1123 if (flags & FWRITE) { 1124 m->flags |= M_TX; 1125 m->wchan = 0; 1126 } 1127 m->synth_flags = flags & (FREAD | FWRITE); 1128 1129 MPU_CALLBACK(m, m->cookie, m->flags); 1130 1131 1132 err: mtx_unlock(&m->qlock); 1133 mtx_unlock(&m->lock); 1134 MIDI_DEBUG(2, printf("midisynth_open: return %d.\n", retval)); 1135 return retval; 1136 } 1137 1138 int 1139 midisynth_close(void *n) 1140 { 1141 struct snd_midi *m = ((struct synth_midi *)n)->m; 1142 int retval; 1143 int oldflags; 1144 1145 MIDI_DEBUG(1, printf("midisynth_close %s %s\n", 1146 m->synth_flags & FREAD ? "M_RX" : "", 1147 m->synth_flags & FWRITE ? "M_TX" : "")); 1148 1149 if (m == NULL) 1150 return ENXIO; 1151 1152 mtx_lock(&m->lock); 1153 mtx_lock(&m->qlock); 1154 1155 if ((m->synth_flags & FREAD && !(m->flags & M_RX)) || 1156 (m->synth_flags & FWRITE && !(m->flags & M_TX))) { 1157 retval = ENXIO; 1158 goto err; 1159 } 1160 m->busy--; 1161 1162 oldflags = m->flags; 1163 1164 if (m->synth_flags & FREAD) 1165 m->flags &= ~(M_RX | M_RXEN); 1166 if (m->synth_flags & FWRITE) 1167 m->flags &= ~M_TX; 1168 1169 if ((m->flags & (M_TXEN | M_RXEN)) != (oldflags & (M_RXEN | M_TXEN))) 1170 MPU_CALLBACK(m, m->cookie, m->flags); 1171 1172 MIDI_DEBUG(1, printf("midi_close: closed, busy = %d.\n", m->busy)); 1173 1174 mtx_unlock(&m->qlock); 1175 mtx_unlock(&m->lock); 1176 retval = 0; 1177 err: return retval; 1178 } 1179 1180 /* 1181 * Always blocking. 1182 */ 1183 1184 int 1185 midisynth_writeraw(void *n, uint8_t *buf, size_t len) 1186 { 1187 struct snd_midi *m = ((struct synth_midi *)n)->m; 1188 int retval; 1189 int used; 1190 int i; 1191 1192 MIDI_DEBUG(4, printf("midisynth_writeraw\n")); 1193 1194 retval = 0; 1195 1196 if (m == NULL) 1197 return ENXIO; 1198 1199 mtx_lock(&m->lock); 1200 mtx_lock(&m->qlock); 1201 1202 if (!(m->flags & M_TX)) 1203 goto err1; 1204 1205 if (midi_dumpraw) 1206 printf("midi dump: "); 1207 1208 while (len > 0) { 1209 while (MIDIQ_AVAIL(m->outq) == 0) { 1210 if (!(m->flags & M_TXEN)) { 1211 m->flags |= M_TXEN; 1212 MPU_CALLBACK(m, m->cookie, m->flags); 1213 } 1214 mtx_unlock(&m->lock); 1215 m->wchan = 1; 1216 MIDI_DEBUG(3, printf("midisynth_writeraw msleep\n")); 1217 retval = msleep(&m->wchan, &m->qlock, 1218 PCATCH | PDROP, "midi TX", 0); 1219 /* 1220 * We slept, maybe things have changed since last 1221 * dying check 1222 */ 1223 if (retval == EINTR) 1224 goto err0; 1225 1226 if (retval) 1227 goto err0; 1228 mtx_lock(&m->lock); 1229 mtx_lock(&m->qlock); 1230 m->wchan = 0; 1231 if (!m->busy) 1232 goto err1; 1233 } 1234 1235 /* 1236 * We are certain than data can be placed on the queue 1237 */ 1238 1239 used = MIN(MIDIQ_AVAIL(m->outq), len); 1240 used = MIN(used, MIDI_WSIZE); 1241 MIDI_DEBUG(5, 1242 printf("midi_synth: resid %zu len %jd avail %jd\n", 1243 len, (intmax_t)MIDIQ_LEN(m->outq), 1244 (intmax_t)MIDIQ_AVAIL(m->outq))); 1245 1246 if (midi_dumpraw) 1247 for (i = 0; i < used; i++) 1248 printf("%x ", buf[i]); 1249 1250 MIDIQ_ENQ(m->outq, buf, used); 1251 len -= used; 1252 1253 /* 1254 * Inform the bottom half that data can be written 1255 */ 1256 if (!(m->flags & M_TXEN)) { 1257 m->flags |= M_TXEN; 1258 MPU_CALLBACK(m, m->cookie, m->flags); 1259 } 1260 } 1261 /* 1262 * If we Made it here then transfer is good 1263 */ 1264 if (midi_dumpraw) 1265 printf("\n"); 1266 1267 retval = 0; 1268 err1: mtx_unlock(&m->qlock); 1269 mtx_unlock(&m->lock); 1270 err0: return retval; 1271 } 1272 1273 static int 1274 midisynth_killnote(void *n, uint8_t chn, uint8_t note, uint8_t vel) 1275 { 1276 u_char c[3]; 1277 1278 1279 if (note > 127 || chn > 15) 1280 return (EINVAL); 1281 1282 if (vel > 127) 1283 vel = 127; 1284 1285 if (vel == 64) { 1286 c[0] = 0x90 | (chn & 0x0f); /* Note on. */ 1287 c[1] = (u_char)note; 1288 c[2] = 0; 1289 } else { 1290 c[0] = 0x80 | (chn & 0x0f); /* Note off. */ 1291 c[1] = (u_char)note; 1292 c[2] = (u_char)vel; 1293 } 1294 1295 return midisynth_writeraw(n, c, 3); 1296 } 1297 1298 static int 1299 midisynth_setinstr(void *n, uint8_t chn, uint16_t instr) 1300 { 1301 u_char c[2]; 1302 1303 if (instr > 127 || chn > 15) 1304 return EINVAL; 1305 1306 c[0] = 0xc0 | (chn & 0x0f); /* Progamme change. */ 1307 c[1] = instr + midi_instroff; 1308 1309 return midisynth_writeraw(n, c, 2); 1310 } 1311 1312 static int 1313 midisynth_startnote(void *n, uint8_t chn, uint8_t note, uint8_t vel) 1314 { 1315 u_char c[3]; 1316 1317 if (note > 127 || chn > 15) 1318 return EINVAL; 1319 1320 if (vel > 127) 1321 vel = 127; 1322 1323 c[0] = 0x90 | (chn & 0x0f); /* Note on. */ 1324 c[1] = (u_char)note; 1325 c[2] = (u_char)vel; 1326 1327 return midisynth_writeraw(n, c, 3); 1328 } 1329 static int 1330 midisynth_alloc(void *n, uint8_t chan, uint8_t note) 1331 { 1332 return chan; 1333 } 1334 1335 static int 1336 midisynth_controller(void *n, uint8_t chn, uint8_t ctrlnum, uint16_t val) 1337 { 1338 u_char c[3]; 1339 1340 if (ctrlnum > 127 || chn > 15) 1341 return EINVAL; 1342 1343 c[0] = 0xb0 | (chn & 0x0f); /* Control Message. */ 1344 c[1] = ctrlnum; 1345 c[2] = val; 1346 return midisynth_writeraw(n, c, 3); 1347 } 1348 1349 static int 1350 midisynth_bender(void *n, uint8_t chn, uint16_t val) 1351 { 1352 u_char c[3]; 1353 1354 1355 if (val > 16383 || chn > 15) 1356 return EINVAL; 1357 1358 c[0] = 0xe0 | (chn & 0x0f); /* Pitch bend. */ 1359 c[1] = (u_char)val & 0x7f; 1360 c[2] = (u_char)(val >> 7) & 0x7f; 1361 1362 return midisynth_writeraw(n, c, 3); 1363 } 1364 1365 /* 1366 * Single point of midi destructions. 1367 */ 1368 static int 1369 midi_destroy(struct snd_midi *m, int midiuninit) 1370 { 1371 sx_assert(&midistat_lock, SA_XLOCKED); 1372 mtx_assert(&m->lock, MA_OWNED); 1373 1374 MIDI_DEBUG(3, printf("midi_destroy\n")); 1375 m->dev->si_drv1 = NULL; 1376 mtx_unlock(&m->lock); /* XXX */ 1377 destroy_dev(m->dev); 1378 TAILQ_REMOVE(&midi_devs, m, link); 1379 if (midiuninit) 1380 MPU_UNINIT(m, m->cookie); 1381 free(MIDIQ_BUF(m->inq), M_MIDI); 1382 free(MIDIQ_BUF(m->outq), M_MIDI); 1383 mtx_destroy(&m->qlock); 1384 mtx_destroy(&m->lock); 1385 free(m->synth, M_MIDI); 1386 free(m, M_MIDI); 1387 return 0; 1388 } 1389 1390 /* 1391 * Load and unload functions, creates the /dev/midistat device 1392 */ 1393 1394 static int 1395 midi_load(void) 1396 { 1397 sx_init(&midistat_lock, "midistat lock"); 1398 TAILQ_INIT(&midi_devs); 1399 1400 midistat_dev = make_dev(&midistat_cdevsw, 1401 MIDIMKMINOR(0, MIDI_DEV_MIDICTL, 0), 1402 UID_ROOT, GID_WHEEL, 0666, "midistat"); 1403 1404 return 0; 1405 } 1406 1407 static int 1408 midi_unload(void) 1409 { 1410 struct snd_midi *m, *tmp; 1411 int retval; 1412 1413 MIDI_DEBUG(1, printf("midi_unload()\n")); 1414 retval = EBUSY; 1415 sx_xlock(&midistat_lock); 1416 if (midistat_isopen) 1417 goto exit0; 1418 1419 TAILQ_FOREACH_SAFE(m, &midi_devs, link, tmp) { 1420 mtx_lock(&m->lock); 1421 if (m->busy) 1422 retval = EBUSY; 1423 else 1424 retval = midi_destroy(m, 1); 1425 if (retval) 1426 goto exit1; 1427 } 1428 sx_xunlock(&midistat_lock); 1429 destroy_dev(midistat_dev); 1430 1431 /* 1432 * Made it here then unload is complete 1433 */ 1434 sx_destroy(&midistat_lock); 1435 return 0; 1436 1437 exit1: 1438 mtx_unlock(&m->lock); 1439 exit0: 1440 sx_xunlock(&midistat_lock); 1441 if (retval) 1442 MIDI_DEBUG(2, printf("midi_unload: failed\n")); 1443 return retval; 1444 } 1445 1446 extern int seq_modevent(module_t mod, int type, void *data); 1447 1448 static int 1449 midi_modevent(module_t mod, int type, void *data) 1450 { 1451 int retval; 1452 1453 retval = 0; 1454 1455 switch (type) { 1456 case MOD_LOAD: 1457 retval = midi_load(); 1458 if (retval == 0) 1459 retval = seq_modevent(mod, type, data); 1460 break; 1461 1462 case MOD_UNLOAD: 1463 retval = midi_unload(); 1464 if (retval == 0) 1465 retval = seq_modevent(mod, type, data); 1466 break; 1467 1468 default: 1469 break; 1470 } 1471 1472 return retval; 1473 } 1474 1475 kobj_t 1476 midimapper_addseq(void *arg1, int *unit, void **cookie) 1477 { 1478 unit = NULL; 1479 1480 return (kobj_t)arg1; 1481 } 1482 1483 int 1484 midimapper_open(void *arg1, void **cookie) 1485 { 1486 int retval = 0; 1487 struct snd_midi *m; 1488 1489 sx_xlock(&midistat_lock); 1490 TAILQ_FOREACH(m, &midi_devs, link) { 1491 retval++; 1492 } 1493 sx_xunlock(&midistat_lock); 1494 return retval; 1495 } 1496 1497 int 1498 midimapper_close(void *arg1, void *cookie) 1499 { 1500 return 0; 1501 } 1502 1503 kobj_t 1504 midimapper_fetch_synth(void *arg, void *cookie, int unit) 1505 { 1506 struct snd_midi *m; 1507 int retval = 0; 1508 1509 sx_xlock(&midistat_lock); 1510 TAILQ_FOREACH(m, &midi_devs, link) { 1511 if (unit == retval) { 1512 sx_xunlock(&midistat_lock); 1513 return (kobj_t)m->synth; 1514 } 1515 retval++; 1516 } 1517 sx_xunlock(&midistat_lock); 1518 return NULL; 1519 } 1520 1521 DEV_MODULE(midi, midi_modevent, NULL); 1522 MODULE_VERSION(midi, 1);
Cache object: 8200826bce5591db3bac202adfa03747
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