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