dsp.c revision 59246
1/* 2 * Copyright (c) 1999 Cameron Grant <gandalf@vilnya.demon.co.uk> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: head/sys/dev/sound/pcm/dsp.c 59246 2000-04-15 05:04:12Z cg $ 27 */ 28 29#include <sys/param.h> 30#include <sys/queue.h> 31#include <sys/kernel.h> 32 33#include <dev/sound/pcm/sound.h> 34 35static int getchns(snddev_info *d, int chan, pcm_channel **rdch, pcm_channel **wrch); 36 37static pcm_channel * 38allocchn(snddev_info *d, int direction) 39{ 40 pcm_channel *chns = (direction == PCMDIR_PLAY)? d->play : d->rec; 41 int i, cnt = (direction == PCMDIR_PLAY)? d->playcount : d->reccount; 42 for (i = 0; i < cnt; i++) { 43 if (!(chns[i].flags & CHN_F_BUSY)) { 44 chns[i].flags |= CHN_F_BUSY; 45 return &chns[i]; 46 } 47 } 48 return NULL; 49} 50 51static int 52getchns(snddev_info *d, int chan, pcm_channel **rdch, pcm_channel **wrch) 53{ 54 KASSERT((d->flags & SD_F_PRIO_SET) != SD_F_PRIO_SET, \ 55 ("getchns: read and write both prioritised")); 56 57 if ((d->flags & SD_F_SIMPLEX) && (d->flags & SD_F_PRIO_SET)) { 58 *rdch = (d->flags & SD_F_PRIO_RD)? d->arec[chan] : &d->fakechan; 59 *wrch = (d->flags & SD_F_PRIO_WR)? d->aplay[chan] : &d->fakechan; 60 d->fakechan.flags |= CHN_F_BUSY; 61 } else { 62 *rdch = d->arec[chan]; 63 *wrch = d->aplay[chan]; 64 } 65 return 0; 66} 67 68static void 69setchns(snddev_info *d, int chan) 70{ 71 KASSERT((d->flags & SD_F_PRIO_SET) != SD_F_PRIO_SET, \ 72 ("getchns: read and write both prioritised")); 73 d->flags |= SD_F_DIR_SET; 74 if (d->swap) d->swap(d->devinfo, (d->flags & SD_F_PRIO_WR)? PCMDIR_PLAY : PCMDIR_REC); 75} 76 77int 78dsp_open(snddev_info *d, int chan, int oflags, int devtype) 79{ 80 pcm_channel *rdch, *wrch; 81 u_int32_t fmt; 82 83 if (chan >= d->chancount) return ENODEV; 84 if ((d->flags & SD_F_SIMPLEX) && (d->ref[chan] > 0)) return EBUSY; 85 rdch = d->arec[chan]; 86 wrch = d->aplay[chan]; 87 if (oflags & FREAD) { 88 if (rdch == NULL) { 89 rdch = allocchn(d, PCMDIR_REC); 90 if (!rdch) return EBUSY; 91 } else return EBUSY; 92 } 93 if (oflags & FWRITE) { 94 if (wrch == NULL) { 95 wrch = allocchn(d, PCMDIR_PLAY); 96 if (!wrch && (oflags & FREAD)) { 97 rdch->flags &= ~CHN_F_BUSY; 98 return EBUSY; 99 } 100 } else return EBUSY; 101 } 102 d->aplay[chan] = wrch; 103 d->arec[chan] = rdch; 104 d->ref[chan]++; 105 switch (devtype) { 106 case SND_DEV_DSP16: 107 fmt = AFMT_S16_LE; 108 break; 109 110 case SND_DEV_DSP: 111 fmt = AFMT_U8; 112 break; 113 114 case SND_DEV_AUDIO: 115 fmt = AFMT_MU_LAW; 116 break; 117 118 case SND_DEV_NORESET: 119 fmt = 0; 120 break; 121 122 default: 123 return ENXIO; 124 } 125 126 if (rdch && (oflags & FREAD)) { 127 chn_reset(rdch); 128 if (oflags & O_NONBLOCK) rdch->flags |= CHN_F_NBIO; 129 if (fmt) { 130 rdch->volume = (100 << 8) | 100; 131 rdch->format = fmt; 132 rdch->speed = DSP_DEFAULT_SPEED; 133 } 134 } 135 if (wrch && (oflags & FWRITE)) { 136 chn_reset(wrch); 137 if (oflags & O_NONBLOCK) wrch->flags |= CHN_F_NBIO; 138 if (fmt) { 139 wrch->volume = (100 << 8) | 100; 140 wrch->format = fmt; 141 wrch->speed = DSP_DEFAULT_SPEED; 142 } 143 } 144 return 0; 145} 146 147int 148dsp_close(snddev_info *d, int chan, int devtype) 149{ 150 pcm_channel *rdch, *wrch; 151 152 d->ref[chan]--; 153 if (d->ref[chan]) return 0; 154 d->flags &= ~SD_F_TRANSIENT; 155 rdch = d->arec[chan]; 156 wrch = d->aplay[chan]; 157 158 if (rdch) { 159 chn_abort(rdch); 160 rdch->flags &= ~(CHN_F_BUSY | CHN_F_RUNNING | CHN_F_MAPPED); 161 chn_reset(rdch); 162 } 163 if (wrch) { 164 chn_flush(wrch); 165 wrch->flags &= ~(CHN_F_BUSY | CHN_F_RUNNING | CHN_F_MAPPED); 166 chn_reset(wrch); 167 } 168 d->aplay[chan] = NULL; 169 d->arec[chan] = NULL; 170 return 0; 171} 172 173int 174dsp_read(snddev_info *d, int chan, struct uio *buf, int flag) 175{ 176 pcm_channel *rdch, *wrch; 177 178 if (!(d->flags & SD_F_PRIO_SET)) d->flags |= SD_F_PRIO_RD; 179 if (!(d->flags & SD_F_DIR_SET)) setchns(d, chan); 180 getchns(d, chan, &rdch, &wrch); 181 KASSERT(rdch, ("dsp_read: nonexistant channel")); 182 KASSERT(rdch->flags & CHN_F_BUSY, ("dsp_read: nonbusy channel")); 183 if (rdch->flags & CHN_F_MAPPED) return EINVAL; 184 if (!(rdch->flags & CHN_F_RUNNING)) { 185 rdch->flags |= CHN_F_RUNNING; 186 chn_reinit(rdch); 187 } 188 return chn_read(rdch, buf); 189} 190 191int 192dsp_write(snddev_info *d, int chan, struct uio *buf, int flag) 193{ 194 pcm_channel *rdch, *wrch; 195 196 if (!(d->flags & SD_F_PRIO_SET)) d->flags |= SD_F_PRIO_WR; 197 if (!(d->flags & SD_F_DIR_SET)) setchns(d, chan); 198 getchns(d, chan, &rdch, &wrch); 199 KASSERT(wrch, ("dsp_write: nonexistant channel")); 200 KASSERT(wrch->flags & CHN_F_BUSY, ("dsp_write: nonbusy channel")); 201 if (wrch->flags & CHN_F_MAPPED) return EINVAL; 202 if (!(wrch->flags & CHN_F_RUNNING)) { 203 wrch->flags |= CHN_F_RUNNING; 204 chn_reinit(wrch); 205 } 206 return chn_write(wrch, buf); 207} 208 209int 210dsp_ioctl(snddev_info *d, int chan, u_long cmd, caddr_t arg) 211{ 212 int ret = 0, *arg_i = (int *)arg; 213 u_long s; 214 pcm_channel *wrch = NULL, *rdch = NULL; 215 216 rdch = d->arec[chan]; 217 wrch = d->aplay[chan]; 218 219 /* 220 * all routines are called with int. blocked. Make sure that 221 * ints are re-enabled when calling slow or blocking functions! 222 */ 223 s = spltty(); 224 switch(cmd) { 225#ifdef OLDPCM_IOCTL 226 /* 227 * we start with the new ioctl interface. 228 */ 229 case AIONWRITE: /* how many bytes can write ? */ 230 if (wrch && wrch->buffer.dl) 231 while (chn_wrfeed(wrch) > 0); 232 *arg_i = wrch? wrch->buffer2nd.fl : 0; 233 break; 234 235 case AIOSSIZE: /* set the current blocksize */ 236 { 237 struct snd_size *p = (struct snd_size *)arg; 238 if (wrch) chn_setblocksize(wrch, p->play_size); 239 if (rdch) chn_setblocksize(rdch, p->rec_size); 240 } 241 /* FALLTHROUGH */ 242 case AIOGSIZE: /* get the current blocksize */ 243 { 244 struct snd_size *p = (struct snd_size *)arg; 245 if (wrch) p->play_size = wrch->blocksize2nd; 246 if (rdch) p->rec_size = rdch->blocksize2nd; 247 } 248 break; 249 250 case AIOSFMT: 251 { 252 snd_chan_param *p = (snd_chan_param *)arg; 253 if (wrch) { 254 chn_setformat(wrch, p->play_format); 255 chn_setspeed(wrch, p->play_rate); 256 } 257 if (rdch) { 258 chn_setformat(rdch, p->rec_format); 259 chn_setspeed(rdch, p->rec_rate); 260 } 261 } 262 /* FALLTHROUGH */ 263 264 case AIOGFMT: 265 { 266 snd_chan_param *p = (snd_chan_param *)arg; 267 p->play_rate = wrch? wrch->speed : 0; 268 p->rec_rate = rdch? rdch->speed : 0; 269 p->play_format = wrch? wrch->format : 0; 270 p->rec_format = rdch? rdch->format : 0; 271 } 272 break; 273 274 case AIOGCAP: /* get capabilities */ 275 { 276 snd_capabilities *p = (snd_capabilities *)arg; 277 pcmchan_caps *pcaps = NULL, *rcaps = NULL; 278 if (rdch) rcaps = chn_getcaps(rdch); 279 if (wrch) pcaps = chn_getcaps(wrch); 280 p->rate_min = max(rcaps? rcaps->minspeed : 0, 281 pcaps? pcaps->minspeed : 0); 282 p->rate_max = min(rcaps? rcaps->maxspeed : 1000000, 283 pcaps? pcaps->maxspeed : 1000000); 284 p->bufsize = min(rdch? rdch->buffer2nd.bufsize : 1000000, 285 wrch? wrch->buffer2nd.bufsize : 1000000); 286 /* XXX bad on sb16 */ 287 p->formats = (rcaps? rcaps->formats : 0xffffffff) & 288 (pcaps? pcaps->formats : 0xffffffff); 289 p->mixers = 1; /* default: one mixer */ 290 p->inputs = d->mixer.devs; 291 p->left = p->right = 100; 292 } 293 break; 294 295 case AIOSTOP: 296 if (*arg_i == AIOSYNC_PLAY && wrch) *arg_i = chn_abort(wrch); 297 else if (*arg_i == AIOSYNC_CAPTURE && rdch) *arg_i = chn_abort(rdch); 298 else { 299 printf("AIOSTOP: bad channel 0x%x\n", *arg_i); 300 *arg_i = 0; 301 } 302 break; 303 304 case AIOSYNC: 305 printf("AIOSYNC chan 0x%03lx pos %lu unimplemented\n", 306 ((snd_sync_parm *)arg)->chan, ((snd_sync_parm *)arg)->pos); 307 break; 308 /* 309 * here follow the standard ioctls (filio.h etc.) 310 */ 311 case FIONREAD: /* get # bytes to read */ 312 if (rdch && rdch->buffer.dl) 313 while (chn_rdfeed(rdch) > 0); 314 *arg_i = rdch? rdch->buffer2nd.rl : 0; 315 break; 316 317 case FIOASYNC: /*set/clear async i/o */ 318 DEB( printf("FIOASYNC\n") ; ) 319 break; 320#endif 321 case SNDCTL_DSP_NONBLOCK: 322#ifdef OLDPCM_IOCTL 323 case FIONBIO: /* set/clear non-blocking i/o */ 324#endif 325 if (rdch) rdch->flags &= ~CHN_F_NBIO; 326 if (wrch) wrch->flags &= ~CHN_F_NBIO; 327 if (*arg_i) { 328 if (rdch) rdch->flags |= CHN_F_NBIO; 329 if (wrch) wrch->flags |= CHN_F_NBIO; 330 } 331 break; 332 333 /* 334 * Finally, here is the linux-compatible ioctl interface 335 */ 336#define THE_REAL_SNDCTL_DSP_GETBLKSIZE _IOWR('P', 4, int) 337 case THE_REAL_SNDCTL_DSP_GETBLKSIZE: 338 case SNDCTL_DSP_GETBLKSIZE: 339 if (wrch) 340 *arg_i = wrch->blocksize2nd; 341 else if (rdch) 342 *arg_i = rdch->blocksize2nd; 343 else 344 *arg_i = 0; 345 break ; 346 347 case SNDCTL_DSP_SETBLKSIZE: 348 RANGE(*arg_i, 16, 65536); 349 if (wrch) chn_setblocksize(wrch, 2, *arg_i); 350 if (rdch) chn_setblocksize(rdch, 2, *arg_i); 351 break; 352 353 case SNDCTL_DSP_RESET: 354 DEB(printf("dsp reset\n")); 355 splx(s); 356 if (wrch) chn_abort(wrch); 357 if (rdch) chn_abort(rdch); 358 break; 359 360 case SNDCTL_DSP_SYNC: 361 DEB(printf("dsp sync\n")); 362 splx(s); 363 if (wrch) chn_sync(wrch, wrch->buffer2nd.bufsize - 4); 364 break; 365 366 case SNDCTL_DSP_SPEED: 367 splx(s); 368 if (wrch) chn_setspeed(wrch, *arg_i); 369 if (rdch) chn_setspeed(rdch, *arg_i); 370 /* fallthru */ 371 372 case SOUND_PCM_READ_RATE: 373 *arg_i = wrch? wrch->speed : rdch->speed; 374 break; 375 376 case SNDCTL_DSP_STEREO: 377 splx(s); 378 if (wrch) chn_setformat(wrch, (wrch->format & ~AFMT_STEREO) | 379 ((*arg_i)? AFMT_STEREO : 0)); 380 if (rdch) chn_setformat(rdch, (rdch->format & ~AFMT_STEREO) | 381 ((*arg_i)? AFMT_STEREO : 0)); 382 *arg_i = ((wrch? wrch->format : rdch->format) & AFMT_STEREO)? 1 : 0; 383 break; 384 385 case SOUND_PCM_WRITE_CHANNELS: 386 splx(s); 387 if (wrch) chn_setformat(wrch, (wrch->format & ~AFMT_STEREO) | 388 ((*arg_i == 2)? AFMT_STEREO : 0)); 389 if (rdch) chn_setformat(rdch, (rdch->format & ~AFMT_STEREO) | 390 ((*arg_i == 2)? AFMT_STEREO : 0)); 391 /* fallthru */ 392 393 case SOUND_PCM_READ_CHANNELS: 394 *arg_i = ((wrch? wrch->format : rdch->format) & AFMT_STEREO)? 2 : 1; 395 break; 396 397 case SNDCTL_DSP_GETFMTS: /* returns a mask of supported fmts */ 398 *arg_i = wrch? chn_getcaps(wrch)->formats : chn_getcaps(rdch)->formats; 399 break ; 400 401 case SNDCTL_DSP_SETFMT: /* sets _one_ format */ 402 splx(s); 403 if (wrch) chn_setformat(wrch, (*arg_i) | (wrch->format & AFMT_STEREO)); 404 if (rdch) chn_setformat(rdch, (*arg_i) | (rdch->format & AFMT_STEREO)); 405 *arg_i = (wrch? wrch->format: rdch->format) & ~AFMT_STEREO; 406 break; 407 408 case SNDCTL_DSP_SUBDIVIDE: 409 /* XXX watch out, this is RW! */ 410 DEB(printf("SNDCTL_DSP_SUBDIVIDE unimplemented\n");) 411 break; 412 413 case SNDCTL_DSP_SETFRAGMENT: 414 /* XXX watch out, this is RW! */ 415 DEB(printf("SNDCTL_DSP_SETFRAGMENT 0x%08x\n", *(int *)arg)); 416 { 417 pcm_channel *c = wrch? wrch : rdch; 418 u_int32_t fragln = (*arg_i) & 0x0000ffff; 419 u_int32_t maxfrags = ((*arg_i) & 0xffff0000) >> 16; 420 u_int32_t fragsz; 421 422 RANGE(fragln, 4, 16); 423 fragsz = 1 << fragln; 424 425 if (maxfrags == 0) 426 maxfrags = CHN_2NDBUFMAXSIZE / fragsz; 427 if (maxfrags < 2) { 428 ret = EINVAL; 429 break; 430 } 431 if (maxfrags * fragsz > CHN_2NDBUFMAXSIZE) 432 maxfrags = CHN_2NDBUFMAXSIZE / fragsz; 433 434 if (rdch) 435 ret = chn_setblocksize(rdch, maxfrags, fragsz); 436 if (wrch && ret == 0) 437 ret = chn_setblocksize(wrch, maxfrags, fragsz); 438 439 *arg_i = (c->fragments << 16) | fragsz; 440 } 441 break; 442 443 case SNDCTL_DSP_GETISPACE: /* XXX Space for reading? Makes no sense... */ 444 /* return the size of data available in the input queue */ 445 { 446 audio_buf_info *a = (audio_buf_info *)arg; 447 if (rdch) { 448 snd_dbuf *b = &rdch->buffer; 449 snd_dbuf *bs = &rdch->buffer2nd; 450 if (b->dl && !(rdch->flags & CHN_F_MAPPED)) 451 /* 452 * Suck up the secondary and DMA buffer. 453 * chn_rdfeed*() takes care of the alignment. 454 */ 455 while (chn_rdfeed(rdch) > 0); 456 a->bytes = bs->rl; 457 a->fragments = a->bytes / rdch->blocksize2nd; 458 a->fragstotal = rdch->fragments; 459 a->fragsize = rdch->blocksize2nd; 460 } 461 } 462 break; 463 464 case SNDCTL_DSP_GETOSPACE: 465 /* return space available in the output queue */ 466 { 467 audio_buf_info *a = (audio_buf_info *)arg; 468 if (wrch) { 469 snd_dbuf *b = &wrch->buffer; 470 snd_dbuf *bs = &wrch->buffer2nd; 471 if (b->dl && !(wrch->flags & CHN_F_MAPPED)) { 472 /* 473 * Fill up the secondary and DMA buffer. 474 * chn_wrfeed*() takes care of the alignment. 475 * Check for underflow before writing into the buffers. 476 */ 477 chn_checkunderflow(wrch); 478 while (chn_wrfeed(wrch) > 0); 479 } 480 a->bytes = bs->fl; 481 a->fragments = a->bytes / wrch->blocksize2nd; 482 a->fragstotal = wrch->fragments; 483 a->fragsize = wrch->blocksize2nd; 484 } 485 } 486 break; 487 488 case SNDCTL_DSP_GETIPTR: 489 { 490 count_info *a = (count_info *)arg; 491 if (rdch) { 492 snd_dbuf *b = &rdch->buffer; 493 snd_dbuf *bs = &rdch->buffer2nd; 494 if (b->dl && !(rdch->flags & CHN_F_MAPPED)) 495 /* 496 * Suck up the secondary and DMA buffer. 497 * chn_rdfeed*() takes care of the alignment. 498 */ 499 while (chn_rdfeed(rdch) > 0); 500 a->bytes = bs->total; 501 a->blocks = bs->rl / rdch->blocksize2nd; 502 a->ptr = bs->rl % rdch->blocksize2nd; 503 } else ret = EINVAL; 504 } 505 break; 506 507 case SNDCTL_DSP_GETOPTR: 508 { 509 count_info *a = (count_info *)arg; 510 if (wrch) { 511 snd_dbuf *b = &wrch->buffer; 512 snd_dbuf *bs = &wrch->buffer2nd; 513 if (b->dl && !(wrch->flags & CHN_F_MAPPED)) { 514 /* 515 * Fill up the secondary and DMA buffer. 516 * chn_wrfeed*() takes care of the alignment. 517 * Check for underflow before writing into the buffers. 518 */ 519 chn_checkunderflow(wrch); 520 while (chn_wrfeed(wrch) > 0); 521 } 522 a->bytes = bs->total; 523 a->blocks = wrch->blocks; 524 a->ptr = bs->rp; 525 wrch->blocks = 0; 526 } else ret = EINVAL; 527 } 528 break; 529 530 case SNDCTL_DSP_GETCAPS: 531 *arg_i = DSP_CAP_REALTIME | DSP_CAP_MMAP | DSP_CAP_TRIGGER; 532 if (rdch && wrch && !(d->flags & SD_F_SIMPLEX)) 533 *arg_i |= DSP_CAP_DUPLEX; 534 break; 535 536 case SOUND_PCM_READ_BITS: 537 *arg_i = ((wrch? wrch->format : rdch->format) & AFMT_16BIT)? 16 : 8; 538 break; 539 540 case SNDCTL_DSP_SETTRIGGER: 541 if (rdch) { 542 rdch->flags &= ~CHN_F_TRIGGERED; 543 if (*arg_i & PCM_ENABLE_INPUT) 544 rdch->flags |= CHN_F_TRIGGERED; 545 chn_intr(rdch); 546 } 547 if (wrch) { 548 wrch->flags &= ~CHN_F_TRIGGERED; 549 if (*arg_i & PCM_ENABLE_OUTPUT) 550 wrch->flags |= CHN_F_TRIGGERED; 551 chn_intr(wrch); 552 } 553 break; 554 555 case SNDCTL_DSP_GETTRIGGER: 556 *arg_i = 0; 557 if (wrch && wrch->flags & CHN_F_TRIGGERED) 558 *arg_i |= PCM_ENABLE_OUTPUT; 559 if (rdch && rdch->flags & CHN_F_TRIGGERED) 560 *arg_i |= PCM_ENABLE_INPUT; 561 break; 562 563 case SNDCTL_DSP_GETODELAY: 564 if (wrch) { 565 snd_dbuf *b = &wrch->buffer; 566 if (b->dl) { 567 chn_checkunderflow(wrch); 568 if (!(wrch->flags & CHN_F_MAPPED)) 569 while (chn_wrfeed(wrch) > 0); 570 } 571 *arg = b->total; 572 } else 573 ret = EINVAL; 574 break; 575 576 case SNDCTL_DSP_MAPINBUF: 577 case SNDCTL_DSP_MAPOUTBUF: 578 case SNDCTL_DSP_SETSYNCRO: 579 /* undocumented */ 580 581 case SNDCTL_DSP_POST: 582 case SOUND_PCM_WRITE_FILTER: 583 case SOUND_PCM_READ_FILTER: 584 /* dunno what these do, don't sound important */ 585 default: 586 DEB(printf("default ioctl chan%d fn 0x%08lx fail\n", chan, cmd)); 587 ret = EINVAL; 588 break; 589 } 590 splx(s); 591 return ret; 592} 593 594int 595dsp_poll(snddev_info *d, int chan, int events, struct proc *p) 596{ 597 int ret = 0, e; 598 pcm_channel *wrch = NULL, *rdch = NULL; 599 600 getchns(d, chan, &rdch, &wrch); 601 e = events & (POLLOUT | POLLWRNORM); 602 if (wrch && e) ret |= chn_poll(wrch, e, p); 603 e = events & (POLLIN | POLLRDNORM); 604 if (rdch && e) ret |= chn_poll(rdch, e, p); 605 return ret; 606} 607 608int 609dsp_mmap(snddev_info *d, int chan, vm_offset_t offset, int nprot) 610{ 611 pcm_channel *wrch = NULL, *rdch = NULL, *c = NULL; 612 613 getchns(d, chan, &rdch, &wrch); 614 /* XXX this is broken by line 204 of vm/device_pager.c, so force write buffer */ 615 if (1 || (wrch && (nprot & PROT_WRITE))) c = wrch; 616 else if (rdch && (nprot & PROT_READ)) c = rdch; 617 if (c) { 618 c->flags |= CHN_F_MAPPED; 619 return atop(vtophys(c->buffer2nd.buf + offset)); 620 } 621 return -1; 622} 623 624