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 #include <sys/kernel.h> 32 33 #include <dev/sound/pcm/sound.h> 34 35 static int getchns(snddev_info *d, int chan, pcm_channel **rdch, pcm_channel **wrch); 36 37 static pcm_channel * 38 allocchn(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 51 static int 52 getchns(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 68 static void 69 setchns(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 77 int 78 dsp_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, fmt); 128 if (oflags & O_NONBLOCK) rdch->flags |= CHN_F_NBIO; 129 } 130 if (wrch && (oflags & FWRITE)) { 131 chn_reset(wrch, fmt); 132 if (oflags & O_NONBLOCK) wrch->flags |= CHN_F_NBIO; 133 } 134 return 0; 135 } 136 137 int 138 dsp_close(snddev_info *d, int chan, int devtype) 139 { 140 pcm_channel *rdch, *wrch; 141 142 d->ref[chan]--; 143 if (d->ref[chan]) return 0; 144 d->flags &= ~SD_F_TRANSIENT; 145 rdch = d->arec[chan]; 146 wrch = d->aplay[chan]; 147 148 if (rdch) { 149 chn_abort(rdch); 150 rdch->flags &= ~(CHN_F_BUSY | CHN_F_RUNNING | CHN_F_MAPPED); 151 chn_reset(rdch, 0); 152 } 153 if (wrch) { 154 chn_flush(wrch); 155 wrch->flags &= ~(CHN_F_BUSY | CHN_F_RUNNING | CHN_F_MAPPED); 156 chn_reset(wrch, 0); 157 } 158 d->aplay[chan] = NULL; 159 d->arec[chan] = NULL; 160 return 0; 161 } 162 163 int 164 dsp_read(snddev_info *d, int chan, struct uio *buf, int flag) 165 { 166 pcm_channel *rdch, *wrch; 167 168 if (!(d->flags & SD_F_PRIO_SET)) d->flags |= SD_F_PRIO_RD; 169 if (!(d->flags & SD_F_DIR_SET)) setchns(d, chan); 170 getchns(d, chan, &rdch, &wrch); 171 KASSERT(rdch, ("dsp_read: nonexistant channel")); 172 KASSERT(rdch->flags & CHN_F_BUSY, ("dsp_read: nonbusy channel")); 173 if (rdch->flags & CHN_F_MAPPED) return EINVAL; 174 if (!(rdch->flags & CHN_F_RUNNING)) 175 rdch->flags |= CHN_F_RUNNING; 176 return chn_read(rdch, buf); 177 } 178 179 int 180 dsp_write(snddev_info *d, int chan, struct uio *buf, int flag) 181 { 182 pcm_channel *rdch, *wrch; 183 184 if (!(d->flags & SD_F_PRIO_SET)) d->flags |= SD_F_PRIO_WR; 185 if (!(d->flags & SD_F_DIR_SET)) setchns(d, chan); 186 getchns(d, chan, &rdch, &wrch); 187 KASSERT(wrch, ("dsp_write: nonexistant channel")); 188 KASSERT(wrch->flags & CHN_F_BUSY, ("dsp_write: nonbusy channel")); 189 if (wrch->flags & CHN_F_MAPPED) return EINVAL; 190 if (!(wrch->flags & CHN_F_RUNNING)) 191 wrch->flags |= CHN_F_RUNNING; 192 return chn_write(wrch, buf); 193 } 194 195 int 196 dsp_ioctl(snddev_info *d, int chan, u_long cmd, caddr_t arg) 197 { 198 int ret = 0, *arg_i = (int *)arg; 199 u_long s; 200 pcm_channel *wrch = NULL, *rdch = NULL; 201 202 rdch = d->arec[chan]; 203 wrch = d->aplay[chan]; 204 205 /* 206 * all routines are called with int. blocked. Make sure that 207 * ints are re-enabled when calling slow or blocking functions! 208 */ 209 s = spltty(); 210 switch(cmd) { 211 #ifdef OLDPCM_IOCTL 212 /* 213 * we start with the new ioctl interface. 214 */ 215 case AIONWRITE: /* how many bytes can write ? */ 216 if (wrch && wrch->buffer.dl) 217 while (chn_wrfeed(wrch) > 0); 218 *arg_i = wrch? wrch->buffer2nd.fl : 0; 219 break; 220 221 case AIOSSIZE: /* set the current blocksize */ 222 { 223 struct snd_size *p = (struct snd_size *)arg; 224 if (wrch) chn_setblocksize(wrch, p->play_size); 225 if (rdch) chn_setblocksize(rdch, p->rec_size); 226 } 227 /* FALLTHROUGH */ 228 case AIOGSIZE: /* get the current blocksize */ 229 { 230 struct snd_size *p = (struct snd_size *)arg; 231 if (wrch) p->play_size = wrch->blocksize2nd; 232 if (rdch) p->rec_size = rdch->blocksize2nd; 233 } 234 break; 235 236 case AIOSFMT: 237 { 238 snd_chan_param *p = (snd_chan_param *)arg; 239 if (wrch) { 240 chn_setformat(wrch, p->play_format); 241 chn_setspeed(wrch, p->play_rate); 242 } 243 if (rdch) { 244 chn_setformat(rdch, p->rec_format); 245 chn_setspeed(rdch, p->rec_rate); 246 } 247 } 248 /* FALLTHROUGH */ 249 250 case AIOGFMT: 251 { 252 snd_chan_param *p = (snd_chan_param *)arg; 253 p->play_rate = wrch? wrch->speed : 0; 254 p->rec_rate = rdch? rdch->speed : 0; 255 p->play_format = wrch? wrch->format : 0; 256 p->rec_format = rdch? rdch->format : 0; 257 } 258 break; 259 260 case AIOGCAP: /* get capabilities */ 261 { 262 snd_capabilities *p = (snd_capabilities *)arg; 263 pcmchan_caps *pcaps = NULL, *rcaps = NULL; 264 if (rdch) rcaps = chn_getcaps(rdch); 265 if (wrch) pcaps = chn_getcaps(wrch); 266 p->rate_min = max(rcaps? rcaps->minspeed : 0, 267 pcaps? pcaps->minspeed : 0); 268 p->rate_max = min(rcaps? rcaps->maxspeed : 1000000, 269 pcaps? pcaps->maxspeed : 1000000); 270 p->bufsize = min(rdch? rdch->buffer2nd.bufsize : 1000000, 271 wrch? wrch->buffer2nd.bufsize : 1000000); 272 /* XXX bad on sb16 */ 273 p->formats = (rcaps? rcaps->formats : 0xffffffff) & 274 (pcaps? pcaps->formats : 0xffffffff); 275 p->mixers = 1; /* default: one mixer */ 276 p->inputs = d->mixer.devs; 277 p->left = p->right = 100; 278 } 279 break; 280 281 case AIOSTOP: 282 if (*arg_i == AIOSYNC_PLAY && wrch) *arg_i = chn_abort(wrch); 283 else if (*arg_i == AIOSYNC_CAPTURE && rdch) *arg_i = chn_abort(rdch); 284 else { 285 printf("AIOSTOP: bad channel 0x%x\n", *arg_i); 286 *arg_i = 0; 287 } 288 break; 289 290 case AIOSYNC: 291 printf("AIOSYNC chan 0x%03lx pos %lu unimplemented\n", 292 ((snd_sync_parm *)arg)->chan, ((snd_sync_parm *)arg)->pos); 293 break; 294 #endif 295 /* 296 * here follow the standard ioctls (filio.h etc.) 297 */ 298 case FIONREAD: /* get # bytes to read */ 299 if (rdch && rdch->buffer.dl) 300 while (chn_rdfeed(rdch) > 0); 301 *arg_i = rdch? rdch->buffer2nd.rl : 0; 302 break; 303 304 case FIOASYNC: /*set/clear async i/o */ 305 DEB( printf("FIOASYNC\n") ; ) 306 break; 307 308 case SNDCTL_DSP_NONBLOCK: 309 case FIONBIO: /* set/clear non-blocking i/o */ 310 if (rdch) rdch->flags &= ~CHN_F_NBIO; 311 if (wrch) wrch->flags &= ~CHN_F_NBIO; 312 if (*arg_i) { 313 if (rdch) rdch->flags |= CHN_F_NBIO; 314 if (wrch) wrch->flags |= CHN_F_NBIO; 315 } 316 break; 317 318 /* 319 * Finally, here is the linux-compatible ioctl interface 320 */ 321 #define THE_REAL_SNDCTL_DSP_GETBLKSIZE _IOWR('P', 4, int) 322 case THE_REAL_SNDCTL_DSP_GETBLKSIZE: 323 case SNDCTL_DSP_GETBLKSIZE: 324 if (wrch) 325 *arg_i = wrch->blocksize2nd; 326 else if (rdch) 327 *arg_i = rdch->blocksize2nd; 328 else 329 *arg_i = 0; 330 break ; 331 332 case SNDCTL_DSP_SETBLKSIZE: 333 RANGE(*arg_i, 16, 65536); 334 if (wrch) chn_setblocksize(wrch, 2, *arg_i); 335 if (rdch) chn_setblocksize(rdch, 2, *arg_i); 336 break; 337 338 case SNDCTL_DSP_RESET: 339 DEB(printf("dsp reset\n")); 340 splx(s); 341 if (wrch) chn_abort(wrch); 342 if (rdch) chn_abort(rdch); 343 break; 344 345 case SNDCTL_DSP_SYNC: 346 DEB(printf("dsp sync\n")); 347 splx(s); 348 if (wrch) chn_sync(wrch, wrch->buffer2nd.bufsize - 4); 349 break; 350 351 case SNDCTL_DSP_SPEED: 352 splx(s); 353 if (wrch) chn_setspeed(wrch, *arg_i); 354 if (rdch) chn_setspeed(rdch, *arg_i); 355 /* fallthru */ 356 357 case SOUND_PCM_READ_RATE: 358 *arg_i = wrch? wrch->speed : rdch->speed; 359 break; 360 361 case SNDCTL_DSP_STEREO: 362 splx(s); 363 if (wrch) chn_setformat(wrch, (wrch->format & ~AFMT_STEREO) | 364 ((*arg_i)? AFMT_STEREO : 0)); 365 if (rdch) chn_setformat(rdch, (rdch->format & ~AFMT_STEREO) | 366 ((*arg_i)? AFMT_STEREO : 0)); 367 *arg_i = ((wrch? wrch->format : rdch->format) & AFMT_STEREO)? 1 : 0; 368 break; 369 370 case SOUND_PCM_WRITE_CHANNELS: 371 splx(s); 372 if (wrch) chn_setformat(wrch, (wrch->format & ~AFMT_STEREO) | 373 ((*arg_i == 2)? AFMT_STEREO : 0)); 374 if (rdch) chn_setformat(rdch, (rdch->format & ~AFMT_STEREO) | 375 ((*arg_i == 2)? AFMT_STEREO : 0)); 376 /* fallthru */ 377 378 case SOUND_PCM_READ_CHANNELS: 379 *arg_i = ((wrch? wrch->format : rdch->format) & AFMT_STEREO)? 2 : 1; 380 break; 381 382 case SNDCTL_DSP_GETFMTS: /* returns a mask of supported fmts */ 383 *arg_i = wrch? chn_getcaps(wrch)->formats : chn_getcaps(rdch)->formats; 384 break ; 385 386 case SNDCTL_DSP_SETFMT: /* sets _one_ format */ 387 splx(s); 388 if (wrch) chn_setformat(wrch, (*arg_i) | (wrch->format & AFMT_STEREO)); 389 if (rdch) chn_setformat(rdch, (*arg_i) | (rdch->format & AFMT_STEREO)); 390 *arg_i = (wrch? wrch->format: rdch->format) & ~AFMT_STEREO; 391 break; 392 393 case SNDCTL_DSP_SUBDIVIDE: 394 /* XXX watch out, this is RW! */ 395 DEB(printf("SNDCTL_DSP_SUBDIVIDE unimplemented\n");) 396 break; 397 398 case SNDCTL_DSP_SETFRAGMENT: 399 /* XXX watch out, this is RW! */ 400 DEB(printf("SNDCTL_DSP_SETFRAGMENT 0x%08x\n", *(int *)arg)); 401 { 402 pcm_channel *c = wrch? wrch : rdch; 403 u_int32_t fragln = (*arg_i) & 0x0000ffff; 404 u_int32_t maxfrags = ((*arg_i) & 0xffff0000) >> 16; 405 u_int32_t fragsz; 406 407 RANGE(fragln, 4, 16); 408 fragsz = 1 << fragln; 409 410 if (maxfrags == 0) 411 maxfrags = CHN_2NDBUFMAXSIZE / fragsz; 412 if (maxfrags < 2) { 413 ret = EINVAL; 414 break; 415 } 416 if (maxfrags * fragsz > CHN_2NDBUFMAXSIZE) 417 maxfrags = CHN_2NDBUFMAXSIZE / fragsz; 418 419 DEB(printf("SNDCTL_DSP_SETFRAGMENT %d frags, %d sz\n", maxfrags, fragsz)); 420 if (rdch) 421 ret = chn_setblocksize(rdch, maxfrags, fragsz); 422 if (wrch && ret == 0) 423 ret = chn_setblocksize(wrch, maxfrags, fragsz); 424 425 *arg_i = (c->fragments << 16) | c->blocksize; 426 } 427 break; 428 429 case SNDCTL_DSP_GETISPACE: /* XXX Space for reading? Makes no sense... */ 430 /* return the size of data available in the input queue */ 431 { 432 audio_buf_info *a = (audio_buf_info *)arg; 433 if (rdch) { 434 snd_dbuf *b = &rdch->buffer; 435 snd_dbuf *bs = &rdch->buffer2nd; 436 if (b->dl && !(rdch->flags & CHN_F_MAPPED)) 437 /* 438 * Suck up the secondary and DMA buffer. 439 * chn_rdfeed*() takes care of the alignment. 440 */ 441 while (chn_rdfeed(rdch) > 0); 442 a->bytes = bs->rl; 443 a->fragments = a->bytes / rdch->blocksize2nd; 444 a->fragstotal = rdch->fragments; 445 a->fragsize = rdch->blocksize2nd; 446 } 447 } 448 break; 449 450 case SNDCTL_DSP_GETOSPACE: 451 /* return space available in the output queue */ 452 { 453 audio_buf_info *a = (audio_buf_info *)arg; 454 if (wrch) { 455 snd_dbuf *b = &wrch->buffer; 456 snd_dbuf *bs = &wrch->buffer2nd; 457 if (b->dl && !(wrch->flags & CHN_F_MAPPED)) { 458 /* 459 * Fill up the secondary and DMA buffer. 460 * chn_wrfeed*() takes care of the alignment. 461 * Check for underflow before writing into the buffers. 462 */ 463 chn_checkunderflow(wrch); 464 while (chn_wrfeed(wrch) > 0); 465 } 466 a->bytes = bs->fl; 467 a->fragments = a->bytes / wrch->blocksize2nd; 468 a->fragstotal = wrch->fragments; 469 a->fragsize = wrch->blocksize2nd; 470 } 471 } 472 break; 473 474 case SNDCTL_DSP_GETIPTR: 475 { 476 count_info *a = (count_info *)arg; 477 if (rdch) { 478 snd_dbuf *b = &rdch->buffer; 479 snd_dbuf *bs = &rdch->buffer2nd; 480 if (b->dl && !(rdch->flags & CHN_F_MAPPED)) 481 /* 482 * Suck up the secondary and DMA buffer. 483 * chn_rdfeed*() takes care of the alignment. 484 */ 485 while (chn_rdfeed(rdch) > 0); 486 a->bytes = bs->total; 487 a->blocks = bs->rl / rdch->blocksize2nd; 488 a->ptr = bs->rl % rdch->blocksize2nd; 489 } else ret = EINVAL; 490 } 491 break; 492 493 case SNDCTL_DSP_GETOPTR: 494 { 495 count_info *a = (count_info *)arg; 496 if (wrch) { 497 snd_dbuf *b = &wrch->buffer; 498 snd_dbuf *bs = &wrch->buffer2nd; 499 if (b->dl && !(wrch->flags & CHN_F_MAPPED)) { 500 /* 501 * Fill up the secondary and DMA buffer. 502 * chn_wrfeed*() takes care of the alignment. 503 * Check for underflow before writing into the buffers. 504 */ 505 chn_checkunderflow(wrch); 506 while (chn_wrfeed(wrch) > 0); 507 } 508 a->bytes = bs->total; 509 a->blocks = wrch->blocks; 510 a->ptr = bs->rp; 511 wrch->blocks = 0; 512 } else ret = EINVAL; 513 } 514 break; 515 516 case SNDCTL_DSP_GETCAPS: 517 *arg_i = DSP_CAP_REALTIME | DSP_CAP_MMAP | DSP_CAP_TRIGGER; 518 if (rdch && wrch && !(d->flags & SD_F_SIMPLEX)) 519 *arg_i |= DSP_CAP_DUPLEX; 520 break; 521 522 case SOUND_PCM_READ_BITS: 523 *arg_i = ((wrch? wrch->format : rdch->format) & AFMT_16BIT)? 16 : 8; 524 break; 525 526 case SNDCTL_DSP_SETTRIGGER: 527 if (rdch) { 528 rdch->flags &= ~(CHN_F_TRIGGERED | CHN_F_NOTRIGGER); 529 if (*arg_i & PCM_ENABLE_INPUT) 530 rdch->flags |= CHN_F_TRIGGERED; 531 else 532 rdch->flags |= CHN_F_NOTRIGGER; 533 chn_intr(rdch); 534 } 535 if (wrch) { 536 wrch->flags &= ~(CHN_F_TRIGGERED | CHN_F_NOTRIGGER); 537 if (*arg_i & PCM_ENABLE_OUTPUT) 538 wrch->flags |= CHN_F_TRIGGERED; 539 else 540 wrch->flags |= CHN_F_NOTRIGGER; 541 chn_intr(wrch); 542 } 543 break; 544 545 case SNDCTL_DSP_GETTRIGGER: 546 *arg_i = 0; 547 if (wrch && wrch->flags & CHN_F_TRIGGERED) 548 *arg_i |= PCM_ENABLE_OUTPUT; 549 if (rdch && rdch->flags & CHN_F_TRIGGERED) 550 *arg_i |= PCM_ENABLE_INPUT; 551 break; 552 553 case SNDCTL_DSP_GETODELAY: 554 if (wrch) { 555 snd_dbuf *b = &wrch->buffer; 556 if (b->dl) { 557 chn_checkunderflow(wrch); 558 if (!(wrch->flags & CHN_F_MAPPED)) 559 while (chn_wrfeed(wrch) > 0); 560 } 561 *arg = b->total; 562 } else 563 ret = EINVAL; 564 break; 565 566 case SNDCTL_DSP_MAPINBUF: 567 case SNDCTL_DSP_MAPOUTBUF: 568 case SNDCTL_DSP_SETSYNCRO: 569 /* undocumented */ 570 571 case SNDCTL_DSP_POST: 572 case SOUND_PCM_WRITE_FILTER: 573 case SOUND_PCM_READ_FILTER: 574 /* dunno what these do, don't sound important */ 575 default: 576 DEB(printf("default ioctl chan%d fn 0x%08lx fail\n", chan, cmd)); 577 ret = EINVAL; 578 break; 579 } 580 splx(s); 581 return ret; 582 } 583 584 int 585 dsp_poll(snddev_info *d, int chan, int events, struct proc *p) 586 { 587 int ret = 0, e; 588 pcm_channel *wrch = NULL, *rdch = NULL; 589 590 getchns(d, chan, &rdch, &wrch); 591 e = events & (POLLOUT | POLLWRNORM); 592 if (wrch && e) ret |= chn_poll(wrch, e, p); 593 e = events & (POLLIN | POLLRDNORM); 594 if (rdch && e) ret |= chn_poll(rdch, e, p); 595 return ret; 596 } 597 598 int 599 dsp_mmap(snddev_info *d, int chan, vm_offset_t offset, int nprot) 600 { 601 pcm_channel *wrch = NULL, *rdch = NULL, *c = NULL; 602 603 getchns(d, chan, &rdch, &wrch); 604 /* XXX this is broken by line 204 of vm/device_pager.c, so force write buffer */ 605 if (1 || (wrch && (nprot & PROT_WRITE))) c = wrch; 606 else if (rdch && (nprot & PROT_READ)) c = rdch; 607 if (c) { 608 c->flags |= CHN_F_MAPPED; 609 return atop(vtophys(c->buffer2nd.buf + offset)); 610 } 611 return -1; 612 } 613 614