1/* 2 * sound/dmabuf.c 3 * 4 * The DMA buffer manager for digitized voice applications 5 */ 6/* 7 * Copyright (C) by Hannu Savolainen 1993-1997 8 * 9 * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL) 10 * Version 2 (June 1991). See the "COPYING" file distributed with this software 11 * for more info. 12 * 13 * Thomas Sailer : moved several static variables into struct audio_operations 14 * (which is grossly misnamed btw.) because they have the same 15 * lifetime as the rest in there and dynamic allocation saves 16 * 12k or so 17 * Thomas Sailer : remove {in,out}_sleep_flag. It was used for the sleeper to 18 * determine if it was woken up by the expiring timeout or by 19 * an explicit wake_up. The return value from schedule_timeout 20 * can be used instead; if 0, the wakeup was due to the timeout. 21 * 22 * Rob Riggs Added persistent DMA buffers (1998/10/17) 23 */ 24 25#define BE_CONSERVATIVE 26#define SAMPLE_ROUNDUP 0 27 28#include "sound_config.h" 29#include <linux/wrapper.h> 30 31#define DMAP_FREE_ON_CLOSE 0 32#define DMAP_KEEP_ON_CLOSE 1 33extern int sound_dmap_flag; 34 35static void dma_reset_output(int dev); 36static void dma_reset_input(int dev); 37static int local_start_dma(struct audio_operations *adev, unsigned long physaddr, int count, int dma_mode); 38 39 40 41static int debugmem = 0; /* switched off by default */ 42static int dma_buffsize = DSP_BUFFSIZE; 43 44static long dmabuf_timeout(struct dma_buffparms *dmap) 45{ 46 long tmout; 47 48 tmout = (dmap->fragment_size * HZ) / dmap->data_rate; 49 tmout += HZ / 5; /* Some safety distance */ 50 if (tmout < (HZ / 2)) 51 tmout = HZ / 2; 52 if (tmout > 20 * HZ) 53 tmout = 20 * HZ; 54 return tmout; 55} 56 57static int sound_alloc_dmap(struct dma_buffparms *dmap) 58{ 59 char *start_addr, *end_addr; 60 int dma_pagesize; 61 int sz, size; 62 struct page *page; 63 64 dmap->mapping_flags &= ~DMA_MAP_MAPPED; 65 66 if (dmap->raw_buf != NULL) 67 return 0; /* Already done */ 68 if (dma_buffsize < 4096) 69 dma_buffsize = 4096; 70 dma_pagesize = (dmap->dma < 4) ? (64 * 1024) : (128 * 1024); 71 72 /* 73 * Now check for the Cyrix problem. 74 */ 75 76 if(isa_dma_bridge_buggy==2) 77 dma_pagesize=32768; 78 79 dmap->raw_buf = NULL; 80 dmap->buffsize = dma_buffsize; 81 if (dmap->buffsize > dma_pagesize) 82 dmap->buffsize = dma_pagesize; 83 start_addr = NULL; 84 /* 85 * Now loop until we get a free buffer. Try to get smaller buffer if 86 * it fails. Don't accept smaller than 8k buffer for performance 87 * reasons. 88 */ 89 while (start_addr == NULL && dmap->buffsize > PAGE_SIZE) { 90 for (sz = 0, size = PAGE_SIZE; size < dmap->buffsize; sz++, size <<= 1); 91 dmap->buffsize = PAGE_SIZE * (1 << sz); 92 start_addr = (char *) __get_free_pages(GFP_ATOMIC|GFP_DMA, sz); 93 if (start_addr == NULL) 94 dmap->buffsize /= 2; 95 } 96 97 if (start_addr == NULL) { 98 printk(KERN_WARNING "Sound error: Couldn't allocate DMA buffer\n"); 99 return -ENOMEM; 100 } else { 101 /* make some checks */ 102 end_addr = start_addr + dmap->buffsize - 1; 103 104 if (debugmem) 105 printk(KERN_DEBUG "sound: start 0x%lx, end 0x%lx\n", (long) start_addr, (long) end_addr); 106 107 /* now check if it fits into the same dma-pagesize */ 108 109 if (((long) start_addr & ~(dma_pagesize - 1)) != ((long) end_addr & ~(dma_pagesize - 1)) 110 || end_addr >= (char *) (MAX_DMA_ADDRESS)) { 111 printk(KERN_ERR "sound: Got invalid address 0x%lx for %db DMA-buffer\n", (long) start_addr, dmap->buffsize); 112 return -EFAULT; 113 } 114 } 115 dmap->raw_buf = start_addr; 116 dmap->raw_buf_phys = virt_to_bus(start_addr); 117 118 for (page = virt_to_page(start_addr); page <= virt_to_page(end_addr); page++) 119 mem_map_reserve(page); 120 return 0; 121} 122 123static void sound_free_dmap(struct dma_buffparms *dmap) 124{ 125 int sz, size; 126 struct page *page; 127 unsigned long start_addr, end_addr; 128 129 if (dmap->raw_buf == NULL) 130 return; 131 if (dmap->mapping_flags & DMA_MAP_MAPPED) 132 return; /* Don't free mmapped buffer. Will use it next time */ 133 for (sz = 0, size = PAGE_SIZE; size < dmap->buffsize; sz++, size <<= 1); 134 135 start_addr = (unsigned long) dmap->raw_buf; 136 end_addr = start_addr + dmap->buffsize; 137 138 for (page = virt_to_page(start_addr); page <= virt_to_page(end_addr); page++) 139 mem_map_unreserve(page); 140 141 free_pages((unsigned long) dmap->raw_buf, sz); 142 dmap->raw_buf = NULL; 143} 144 145 146/* Intel version !!!!!!!!! */ 147 148static int sound_start_dma(struct dma_buffparms *dmap, unsigned long physaddr, int count, int dma_mode) 149{ 150 unsigned long flags; 151 int chan = dmap->dma; 152 153 /* printk( "Start DMA%d %d, %d\n", chan, (int)(physaddr-dmap->raw_buf_phys), count); */ 154 155 flags = claim_dma_lock(); 156 disable_dma(chan); 157 clear_dma_ff(chan); 158 set_dma_mode(chan, dma_mode); 159 set_dma_addr(chan, physaddr); 160 set_dma_count(chan, count); 161 enable_dma(chan); 162 release_dma_lock(flags); 163 164 return 0; 165} 166 167static void dma_init_buffers(struct dma_buffparms *dmap) 168{ 169 dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0; 170 dmap->byte_counter = 0; 171 dmap->max_byte_counter = 8000 * 60 * 60; 172 dmap->bytes_in_use = dmap->buffsize; 173 174 dmap->dma_mode = DMODE_NONE; 175 dmap->mapping_flags = 0; 176 dmap->neutral_byte = 0x80; 177 dmap->data_rate = 8000; 178 dmap->cfrag = -1; 179 dmap->closing = 0; 180 dmap->nbufs = 1; 181 dmap->flags = DMA_BUSY; /* Other flags off */ 182} 183 184static int open_dmap(struct audio_operations *adev, int mode, struct dma_buffparms *dmap) 185{ 186 int err; 187 188 if (dmap->flags & DMA_BUSY) 189 return -EBUSY; 190 if ((err = sound_alloc_dmap(dmap)) < 0) 191 return err; 192 193 if (dmap->raw_buf == NULL) { 194 printk(KERN_WARNING "Sound: DMA buffers not available\n"); 195 return -ENOSPC; /* Memory allocation failed during boot */ 196 } 197 if (dmap->dma >= 0 && sound_open_dma(dmap->dma, adev->name)) { 198 printk(KERN_WARNING "Unable to grab(2) DMA%d for the audio driver\n", dmap->dma); 199 return -EBUSY; 200 } 201 dma_init_buffers(dmap); 202 dmap->open_mode = mode; 203 dmap->subdivision = dmap->underrun_count = 0; 204 dmap->fragment_size = 0; 205 dmap->max_fragments = 65536; /* Just a large value */ 206 dmap->byte_counter = 0; 207 dmap->max_byte_counter = 8000 * 60 * 60; 208 dmap->applic_profile = APF_NORMAL; 209 dmap->needs_reorg = 1; 210 dmap->audio_callback = NULL; 211 dmap->callback_parm = 0; 212 return 0; 213} 214 215static void close_dmap(struct audio_operations *adev, struct dma_buffparms *dmap) 216{ 217 unsigned long flags; 218 219 if (dmap->dma >= 0) { 220 sound_close_dma(dmap->dma); 221 flags=claim_dma_lock(); 222 disable_dma(dmap->dma); 223 release_dma_lock(flags); 224 } 225 if (dmap->flags & DMA_BUSY) 226 dmap->dma_mode = DMODE_NONE; 227 dmap->flags &= ~DMA_BUSY; 228 229 if (sound_dmap_flag == DMAP_FREE_ON_CLOSE) 230 sound_free_dmap(dmap); 231} 232 233 234static unsigned int default_set_bits(int dev, unsigned int bits) 235{ 236 mm_segment_t fs = get_fs(); 237 238 set_fs(get_ds()); 239 audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_SETFMT, (caddr_t)&bits); 240 set_fs(fs); 241 return bits; 242} 243 244static int default_set_speed(int dev, int speed) 245{ 246 mm_segment_t fs = get_fs(); 247 248 set_fs(get_ds()); 249 audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_SPEED, (caddr_t)&speed); 250 set_fs(fs); 251 return speed; 252} 253 254static short default_set_channels(int dev, short channels) 255{ 256 int c = channels; 257 mm_segment_t fs = get_fs(); 258 259 set_fs(get_ds()); 260 audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_CHANNELS, (caddr_t)&c); 261 set_fs(fs); 262 return c; 263} 264 265static void check_driver(struct audio_driver *d) 266{ 267 if (d->set_speed == NULL) 268 d->set_speed = default_set_speed; 269 if (d->set_bits == NULL) 270 d->set_bits = default_set_bits; 271 if (d->set_channels == NULL) 272 d->set_channels = default_set_channels; 273} 274 275int DMAbuf_open(int dev, int mode) 276{ 277 struct audio_operations *adev = audio_devs[dev]; 278 int retval; 279 struct dma_buffparms *dmap_in = NULL; 280 struct dma_buffparms *dmap_out = NULL; 281 282 if (!adev) 283 return -ENXIO; 284 if (!(adev->flags & DMA_DUPLEX)) 285 adev->dmap_in = adev->dmap_out; 286 check_driver(adev->d); 287 288 if ((retval = adev->d->open(dev, mode)) < 0) 289 return retval; 290 dmap_out = adev->dmap_out; 291 dmap_in = adev->dmap_in; 292 if (dmap_in == dmap_out) 293 adev->flags &= ~DMA_DUPLEX; 294 295 if (mode & OPEN_WRITE) { 296 if ((retval = open_dmap(adev, mode, dmap_out)) < 0) { 297 adev->d->close(dev); 298 return retval; 299 } 300 } 301 adev->enable_bits = mode; 302 303 if (mode == OPEN_READ || (mode != OPEN_WRITE && (adev->flags & DMA_DUPLEX))) { 304 if ((retval = open_dmap(adev, mode, dmap_in)) < 0) { 305 adev->d->close(dev); 306 if (mode & OPEN_WRITE) 307 close_dmap(adev, dmap_out); 308 return retval; 309 } 310 } 311 adev->open_mode = mode; 312 adev->go = 1; 313 314 adev->d->set_bits(dev, 8); 315 adev->d->set_channels(dev, 1); 316 adev->d->set_speed(dev, DSP_DEFAULT_SPEED); 317 if (adev->dmap_out->dma_mode == DMODE_OUTPUT) 318 memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte, 319 adev->dmap_out->bytes_in_use); 320 return 0; 321} 322 323void DMAbuf_reset(int dev) 324{ 325 if (audio_devs[dev]->open_mode & OPEN_WRITE) 326 dma_reset_output(dev); 327 328 if (audio_devs[dev]->open_mode & OPEN_READ) 329 dma_reset_input(dev); 330} 331 332static void dma_reset_output(int dev) 333{ 334 struct audio_operations *adev = audio_devs[dev]; 335 unsigned long flags,f ; 336 struct dma_buffparms *dmap = adev->dmap_out; 337 338 if (!(dmap->flags & DMA_STARTED)) /* DMA is not active */ 339 return; 340 341 /* 342 * First wait until the current fragment has been played completely 343 */ 344 save_flags(flags); 345 cli(); 346 adev->dmap_out->flags |= DMA_SYNCING; 347 348 adev->dmap_out->underrun_count = 0; 349 if (!signal_pending(current) && adev->dmap_out->qlen && 350 adev->dmap_out->underrun_count == 0) 351 interruptible_sleep_on_timeout(&adev->out_sleeper, 352 dmabuf_timeout(dmap)); 353 adev->dmap_out->flags &= ~(DMA_SYNCING | DMA_ACTIVE); 354 355 /* 356 * Finally shut the device off 357 */ 358 if (!(adev->flags & DMA_DUPLEX) || !adev->d->halt_output) 359 adev->d->halt_io(dev); 360 else 361 adev->d->halt_output(dev); 362 adev->dmap_out->flags &= ~DMA_STARTED; 363 364 f=claim_dma_lock(); 365 clear_dma_ff(dmap->dma); 366 disable_dma(dmap->dma); 367 release_dma_lock(f); 368 369 restore_flags(flags); 370 dmap->byte_counter = 0; 371 reorganize_buffers(dev, adev->dmap_out, 0); 372 dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0; 373} 374 375static void dma_reset_input(int dev) 376{ 377 struct audio_operations *adev = audio_devs[dev]; 378 unsigned long flags; 379 struct dma_buffparms *dmap = adev->dmap_in; 380 381 save_flags(flags); 382 cli(); 383 if (!(adev->flags & DMA_DUPLEX) || !adev->d->halt_input) 384 adev->d->halt_io(dev); 385 else 386 adev->d->halt_input(dev); 387 adev->dmap_in->flags &= ~DMA_STARTED; 388 restore_flags(flags); 389 390 dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0; 391 dmap->byte_counter = 0; 392 reorganize_buffers(dev, adev->dmap_in, 1); 393} 394 395void DMAbuf_launch_output(int dev, struct dma_buffparms *dmap) 396{ 397 struct audio_operations *adev = audio_devs[dev]; 398 399 if (!((adev->enable_bits * adev->go) & PCM_ENABLE_OUTPUT)) 400 return; /* Don't start DMA yet */ 401 dmap->dma_mode = DMODE_OUTPUT; 402 403 if (!(dmap->flags & DMA_ACTIVE) || !(adev->flags & DMA_AUTOMODE) || (dmap->flags & DMA_NODMA)) { 404 if (!(dmap->flags & DMA_STARTED)) { 405 reorganize_buffers(dev, dmap, 0); 406 if (adev->d->prepare_for_output(dev, dmap->fragment_size, dmap->nbufs)) 407 return; 408 if (!(dmap->flags & DMA_NODMA)) 409 local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use,DMA_MODE_WRITE); 410 dmap->flags |= DMA_STARTED; 411 } 412 if (dmap->counts[dmap->qhead] == 0) 413 dmap->counts[dmap->qhead] = dmap->fragment_size; 414 dmap->dma_mode = DMODE_OUTPUT; 415 adev->d->output_block(dev, dmap->raw_buf_phys + dmap->qhead * dmap->fragment_size, 416 dmap->counts[dmap->qhead], 1); 417 if (adev->d->trigger) 418 adev->d->trigger(dev,adev->enable_bits * adev->go); 419 } 420 dmap->flags |= DMA_ACTIVE; 421} 422 423int DMAbuf_sync(int dev) 424{ 425 struct audio_operations *adev = audio_devs[dev]; 426 unsigned long flags; 427 int n = 0; 428 struct dma_buffparms *dmap; 429 430 if (!adev->go && !(adev->enable_bits & PCM_ENABLE_OUTPUT)) 431 return 0; 432 433 if (adev->dmap_out->dma_mode == DMODE_OUTPUT) { 434 dmap = adev->dmap_out; 435 save_flags(flags); 436 cli(); 437 if (dmap->qlen > 0 && !(dmap->flags & DMA_ACTIVE)) 438 DMAbuf_launch_output(dev, dmap); 439 adev->dmap_out->flags |= DMA_SYNCING; 440 adev->dmap_out->underrun_count = 0; 441 while (!signal_pending(current) && n++ <= adev->dmap_out->nbufs && 442 adev->dmap_out->qlen && adev->dmap_out->underrun_count == 0) { 443 long t = dmabuf_timeout(dmap); 444 t = interruptible_sleep_on_timeout(&adev->out_sleeper, 445 t); 446 if (!t) { 447 adev->dmap_out->flags &= ~DMA_SYNCING; 448 restore_flags(flags); 449 return adev->dmap_out->qlen; 450 } 451 } 452 adev->dmap_out->flags &= ~(DMA_SYNCING | DMA_ACTIVE); 453 restore_flags(flags); 454 455 /* 456 * Some devices such as GUS have huge amount of on board RAM for the 457 * audio data. We have to wait until the device has finished playing. 458 */ 459 460 save_flags(flags); 461 cli(); 462 if (adev->d->local_qlen) { /* Device has hidden buffers */ 463 while (!signal_pending(current) && 464 adev->d->local_qlen(dev)) 465 interruptible_sleep_on_timeout(&adev->out_sleeper, 466 dmabuf_timeout(dmap)); 467 } 468 restore_flags(flags); 469 } 470 adev->dmap_out->dma_mode = DMODE_NONE; 471 return adev->dmap_out->qlen; 472} 473 474int DMAbuf_release(int dev, int mode) 475{ 476 struct audio_operations *adev = audio_devs[dev]; 477 unsigned long flags; 478 479 if (adev->open_mode & OPEN_WRITE) 480 adev->dmap_out->closing = 1; 481 if (adev->open_mode & OPEN_READ) 482 adev->dmap_in->closing = 1; 483 484 if (adev->open_mode & OPEN_WRITE) 485 if (!(adev->dmap_out->mapping_flags & DMA_MAP_MAPPED)) 486 if (!signal_pending(current) && (adev->dmap_out->dma_mode == DMODE_OUTPUT)) 487 DMAbuf_sync(dev); 488 if (adev->dmap_out->dma_mode == DMODE_OUTPUT) 489 memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte, adev->dmap_out->bytes_in_use); 490 save_flags(flags); 491 cli(); 492 493 DMAbuf_reset(dev); 494 adev->d->close(dev); 495 496 if (adev->open_mode & OPEN_WRITE) 497 close_dmap(adev, adev->dmap_out); 498 499 if (adev->open_mode == OPEN_READ || 500 (adev->open_mode != OPEN_WRITE && 501 (adev->flags & DMA_DUPLEX))) 502 close_dmap(adev, adev->dmap_in); 503 adev->open_mode = 0; 504 restore_flags(flags); 505 return 0; 506} 507 508int DMAbuf_activate_recording(int dev, struct dma_buffparms *dmap) 509{ 510 struct audio_operations *adev = audio_devs[dev]; 511 int err; 512 513 if (!(adev->open_mode & OPEN_READ)) 514 return 0; 515 if (!(adev->enable_bits & PCM_ENABLE_INPUT)) 516 return 0; 517 if (dmap->dma_mode == DMODE_OUTPUT) { /* Direction change */ 518 DMAbuf_sync(dev); 519 DMAbuf_reset(dev); 520 dmap->dma_mode = DMODE_NONE; 521 } 522 if (!dmap->dma_mode) { 523 reorganize_buffers(dev, dmap, 1); 524 if ((err = adev->d->prepare_for_input(dev, 525 dmap->fragment_size, dmap->nbufs)) < 0) 526 return err; 527 dmap->dma_mode = DMODE_INPUT; 528 } 529 if (!(dmap->flags & DMA_ACTIVE)) { 530 if (dmap->needs_reorg) 531 reorganize_buffers(dev, dmap, 0); 532 local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use, DMA_MODE_READ); 533 adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size, 534 dmap->fragment_size, 0); 535 dmap->flags |= DMA_ACTIVE; 536 if (adev->d->trigger) 537 adev->d->trigger(dev, adev->enable_bits * adev->go); 538 } 539 return 0; 540} 541 542int DMAbuf_getrdbuffer(int dev, char **buf, int *len, int dontblock) 543{ 544 struct audio_operations *adev = audio_devs[dev]; 545 unsigned long flags; 546 int err = 0, n = 0; 547 struct dma_buffparms *dmap = adev->dmap_in; 548 int go; 549 550 if (!(adev->open_mode & OPEN_READ)) 551 return -EIO; 552 if (dmap->needs_reorg) 553 reorganize_buffers(dev, dmap, 0); 554 save_flags(flags); 555 cli(); 556 if (adev->dmap_in->mapping_flags & DMA_MAP_MAPPED) { 557/* printk(KERN_WARNING "Sound: Can't read from mmapped device (1)\n");*/ 558 restore_flags(flags); 559 return -EINVAL; 560 } else while (dmap->qlen <= 0 && n++ < 10) { 561 long timeout = MAX_SCHEDULE_TIMEOUT; 562 if (!(adev->enable_bits & PCM_ENABLE_INPUT) || !adev->go) { 563 restore_flags(flags); 564 return -EAGAIN; 565 } 566 if ((err = DMAbuf_activate_recording(dev, dmap)) < 0) { 567 restore_flags(flags); 568 return err; 569 } 570 /* Wait for the next block */ 571 572 if (dontblock) { 573 restore_flags(flags); 574 return -EAGAIN; 575 } 576 if ((go = adev->go)) 577 timeout = dmabuf_timeout(dmap); 578 timeout = interruptible_sleep_on_timeout(&adev->in_sleeper, 579 timeout); 580 if (!timeout) { 581 err = -EIO; 582 printk(KERN_WARNING "Sound: DMA (input) timed out - IRQ/DRQ config error?\n"); 583 dma_reset_input(dev); 584 } else 585 err = -EINTR; 586 } 587 restore_flags(flags); 588 589 if (dmap->qlen <= 0) 590 return err ? err : -EINTR; 591 *buf = &dmap->raw_buf[dmap->qhead * dmap->fragment_size + dmap->counts[dmap->qhead]]; 592 *len = dmap->fragment_size - dmap->counts[dmap->qhead]; 593 594 return dmap->qhead; 595} 596 597int DMAbuf_rmchars(int dev, int buff_no, int c) 598{ 599 struct audio_operations *adev = audio_devs[dev]; 600 struct dma_buffparms *dmap = adev->dmap_in; 601 int p = dmap->counts[dmap->qhead] + c; 602 603 if (dmap->mapping_flags & DMA_MAP_MAPPED) 604 { 605/* printk("Sound: Can't read from mmapped device (2)\n");*/ 606 return -EINVAL; 607 } 608 else if (dmap->qlen <= 0) 609 return -EIO; 610 else if (p >= dmap->fragment_size) { /* This buffer is completely empty */ 611 dmap->counts[dmap->qhead] = 0; 612 dmap->qlen--; 613 dmap->qhead = (dmap->qhead + 1) % dmap->nbufs; 614 } 615 else dmap->counts[dmap->qhead] = p; 616 617 return 0; 618} 619 620int DMAbuf_get_buffer_pointer(int dev, struct dma_buffparms *dmap, int direction) 621{ 622 /* 623 * Try to approximate the active byte position of the DMA pointer within the 624 * buffer area as well as possible. 625 */ 626 627 int pos; 628 unsigned long flags; 629 unsigned long f; 630 631 save_flags(flags); 632 cli(); 633 if (!(dmap->flags & DMA_ACTIVE)) 634 pos = 0; 635 else { 636 int chan = dmap->dma; 637 638 f=claim_dma_lock(); 639 clear_dma_ff(chan); 640 641 if(!isa_dma_bridge_buggy) 642 disable_dma(dmap->dma); 643 644 pos = get_dma_residue(chan); 645 646 pos = dmap->bytes_in_use - pos; 647 648 if (!(dmap->mapping_flags & DMA_MAP_MAPPED)) { 649 if (direction == DMODE_OUTPUT) { 650 if (dmap->qhead == 0) 651 if (pos > dmap->fragment_size) 652 pos = 0; 653 } else { 654 if (dmap->qtail == 0) 655 if (pos > dmap->fragment_size) 656 pos = 0; 657 } 658 } 659 if (pos < 0) 660 pos = 0; 661 if (pos >= dmap->bytes_in_use) 662 pos = 0; 663 664 if(!isa_dma_bridge_buggy) 665 enable_dma(dmap->dma); 666 667 release_dma_lock(f); 668 } 669 restore_flags(flags); 670 /* printk( "%04x ", pos); */ 671 672 return pos; 673} 674 675/* 676 * DMAbuf_start_devices() is called by the /dev/music driver to start 677 * one or more audio devices at desired moment. 678 */ 679 680void DMAbuf_start_devices(unsigned int devmask) 681{ 682 struct audio_operations *adev; 683 int dev; 684 685 for (dev = 0; dev < num_audiodevs; dev++) { 686 if (!(devmask & (1 << dev))) 687 continue; 688 if (!(adev = audio_devs[dev])) 689 continue; 690 if (adev->open_mode == 0) 691 continue; 692 if (adev->go) 693 continue; 694 /* OK to start the device */ 695 adev->go = 1; 696 if (adev->d->trigger) 697 adev->d->trigger(dev,adev->enable_bits * adev->go); 698 } 699} 700 701int DMAbuf_space_in_queue(int dev) 702{ 703 struct audio_operations *adev = audio_devs[dev]; 704 int len, max, tmp; 705 struct dma_buffparms *dmap = adev->dmap_out; 706 int lim = dmap->nbufs; 707 708 if (lim < 2) 709 lim = 2; 710 711 if (dmap->qlen >= lim) /* No space at all */ 712 return 0; 713 714 /* 715 * Verify that there are no more pending buffers than the limit 716 * defined by the process. 717 */ 718 719 max = dmap->max_fragments; 720 if (max > lim) 721 max = lim; 722 len = dmap->qlen; 723 724 if (adev->d->local_qlen) { 725 tmp = adev->d->local_qlen(dev); 726 if (tmp && len) 727 tmp--; /* This buffer has been counted twice */ 728 len += tmp; 729 } 730 if (dmap->byte_counter % dmap->fragment_size) /* There is a partial fragment */ 731 len = len + 1; 732 733 if (len >= max) 734 return 0; 735 return max - len; 736} 737 738static int output_sleep(int dev, int dontblock) 739{ 740 struct audio_operations *adev = audio_devs[dev]; 741 int err = 0; 742 struct dma_buffparms *dmap = adev->dmap_out; 743 long timeout; 744 long timeout_value; 745 746 if (dontblock) 747 return -EAGAIN; 748 if (!(adev->enable_bits & PCM_ENABLE_OUTPUT)) 749 return -EAGAIN; 750 751 /* 752 * Wait for free space 753 */ 754 if (signal_pending(current)) 755 return -EINTR; 756 timeout = (adev->go && !(dmap->flags & DMA_NOTIMEOUT)); 757 if (timeout) 758 timeout_value = dmabuf_timeout(dmap); 759 else 760 timeout_value = MAX_SCHEDULE_TIMEOUT; 761 timeout_value = interruptible_sleep_on_timeout(&adev->out_sleeper, 762 timeout_value); 763 if (timeout != MAX_SCHEDULE_TIMEOUT && !timeout_value) { 764 printk(KERN_WARNING "Sound: DMA (output) timed out - IRQ/DRQ config error?\n"); 765 dma_reset_output(dev); 766 } else { 767 if (signal_pending(current)) 768 err = -EINTR; 769 } 770 return err; 771} 772 773static int find_output_space(int dev, char **buf, int *size) 774{ 775 struct audio_operations *adev = audio_devs[dev]; 776 struct dma_buffparms *dmap = adev->dmap_out; 777 unsigned long flags; 778 unsigned long active_offs; 779 long len, offs; 780 int maxfrags; 781 int occupied_bytes = (dmap->user_counter % dmap->fragment_size); 782 783 *buf = dmap->raw_buf; 784 if (!(maxfrags = DMAbuf_space_in_queue(dev)) && !occupied_bytes) 785 return 0; 786 save_flags(flags); 787 cli(); 788 789#ifdef BE_CONSERVATIVE 790 active_offs = dmap->byte_counter + dmap->qhead * dmap->fragment_size; 791#else 792 active_offs = DMAbuf_get_buffer_pointer(dev, dmap, DMODE_OUTPUT); 793 /* Check for pointer wrapping situation */ 794 if (active_offs < 0 || active_offs >= dmap->bytes_in_use) 795 active_offs = 0; 796 active_offs += dmap->byte_counter; 797#endif 798 799 offs = (dmap->user_counter % dmap->bytes_in_use) & ~SAMPLE_ROUNDUP; 800 if (offs < 0 || offs >= dmap->bytes_in_use) { 801 restore_flags(flags); 802 printk(KERN_ERR "Sound: Got unexpected offs %ld. Giving up.\n", offs); 803 printk("Counter = %ld, bytes=%d\n", dmap->user_counter, dmap->bytes_in_use); 804 return 0; 805 } 806 *buf = dmap->raw_buf + offs; 807 808 len = active_offs + dmap->bytes_in_use - dmap->user_counter; /* Number of unused bytes in buffer */ 809 810 if ((offs + len) > dmap->bytes_in_use) 811 len = dmap->bytes_in_use - offs; 812 if (len < 0) { 813 restore_flags(flags); 814 return 0; 815 } 816 if (len > ((maxfrags * dmap->fragment_size) - occupied_bytes)) 817 len = (maxfrags * dmap->fragment_size) - occupied_bytes; 818 *size = len & ~SAMPLE_ROUNDUP; 819 restore_flags(flags); 820 return (*size > 0); 821} 822 823int DMAbuf_getwrbuffer(int dev, char **buf, int *size, int dontblock) 824{ 825 struct audio_operations *adev = audio_devs[dev]; 826 unsigned long flags; 827 int err = -EIO; 828 struct dma_buffparms *dmap = adev->dmap_out; 829 830 if (dmap->needs_reorg) 831 reorganize_buffers(dev, dmap, 0); 832 833 if (dmap->mapping_flags & DMA_MAP_MAPPED) { 834/* printk(KERN_DEBUG "Sound: Can't write to mmapped device (3)\n");*/ 835 return -EINVAL; 836 } 837 if (dmap->dma_mode == DMODE_INPUT) { /* Direction change */ 838 DMAbuf_reset(dev); 839 dmap->dma_mode = DMODE_NONE; 840 } 841 dmap->dma_mode = DMODE_OUTPUT; 842 843 save_flags(flags); 844 cli(); 845 while (find_output_space(dev, buf, size) <= 0) { 846 if ((err = output_sleep(dev, dontblock)) < 0) { 847 restore_flags(flags); 848 return err; 849 } 850 } 851 restore_flags(flags); 852 853 return 0; 854} 855 856int DMAbuf_move_wrpointer(int dev, int l) 857{ 858 struct audio_operations *adev = audio_devs[dev]; 859 struct dma_buffparms *dmap = adev->dmap_out; 860 unsigned long ptr = (dmap->user_counter / dmap->fragment_size) * dmap->fragment_size; 861 unsigned long end_ptr, p; 862 int post = (dmap->flags & DMA_POST); 863 864 dmap->flags &= ~DMA_POST; 865 dmap->cfrag = -1; 866 dmap->user_counter += l; 867 dmap->flags |= DMA_DIRTY; 868 869 if (dmap->byte_counter >= dmap->max_byte_counter) { 870 /* Wrap the byte counters */ 871 long decr = dmap->byte_counter; 872 dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use); 873 decr -= dmap->byte_counter; 874 dmap->user_counter -= decr; 875 } 876 end_ptr = (dmap->user_counter / dmap->fragment_size) * dmap->fragment_size; 877 878 p = (dmap->user_counter - 1) % dmap->bytes_in_use; 879 dmap->neutral_byte = dmap->raw_buf[p]; 880 881 /* Update the fragment based bookkeeping too */ 882 while (ptr < end_ptr) { 883 dmap->counts[dmap->qtail] = dmap->fragment_size; 884 dmap->qtail = (dmap->qtail + 1) % dmap->nbufs; 885 dmap->qlen++; 886 ptr += dmap->fragment_size; 887 } 888 889 dmap->counts[dmap->qtail] = dmap->user_counter - ptr; 890 891 /* 892 * Let the low level driver to perform some postprocessing to 893 * the written data. 894 */ 895 if (adev->d->postprocess_write) 896 adev->d->postprocess_write(dev); 897 898 if (!(dmap->flags & DMA_ACTIVE)) 899 if (dmap->qlen > 1 || (dmap->qlen > 0 && (post || dmap->qlen >= dmap->nbufs - 1))) 900 DMAbuf_launch_output(dev, dmap); 901 return 0; 902} 903 904int DMAbuf_start_dma(int dev, unsigned long physaddr, int count, int dma_mode) 905{ 906 struct audio_operations *adev = audio_devs[dev]; 907 struct dma_buffparms *dmap = (dma_mode == DMA_MODE_WRITE) ? adev->dmap_out : adev->dmap_in; 908 909 if (dmap->raw_buf == NULL) { 910 printk(KERN_ERR "sound: DMA buffer(1) == NULL\n"); 911 printk("Device %d, chn=%s\n", dev, (dmap == adev->dmap_out) ? "out" : "in"); 912 return 0; 913 } 914 if (dmap->dma < 0) 915 return 0; 916 sound_start_dma(dmap, physaddr, count, dma_mode); 917 return count; 918} 919 920static int local_start_dma(struct audio_operations *adev, unsigned long physaddr, int count, int dma_mode) 921{ 922 struct dma_buffparms *dmap = (dma_mode == DMA_MODE_WRITE) ? adev->dmap_out : adev->dmap_in; 923 924 if (dmap->raw_buf == NULL) { 925 printk(KERN_ERR "sound: DMA buffer(2) == NULL\n"); 926 printk(KERN_ERR "Device %s, chn=%s\n", adev->name, (dmap == adev->dmap_out) ? "out" : "in"); 927 return 0; 928 } 929 if (dmap->flags & DMA_NODMA) 930 return 1; 931 if (dmap->dma < 0) 932 return 0; 933 sound_start_dma(dmap, dmap->raw_buf_phys, dmap->bytes_in_use, dma_mode | DMA_AUTOINIT); 934 dmap->flags |= DMA_STARTED; 935 return count; 936} 937 938static void finish_output_interrupt(int dev, struct dma_buffparms *dmap) 939{ 940 struct audio_operations *adev = audio_devs[dev]; 941 942 if (dmap->audio_callback != NULL) 943 dmap->audio_callback(dev, dmap->callback_parm); 944 wake_up(&adev->out_sleeper); 945 wake_up(&adev->poll_sleeper); 946} 947 948static void do_outputintr(int dev, int dummy) 949{ 950 struct audio_operations *adev = audio_devs[dev]; 951 unsigned long flags; 952 struct dma_buffparms *dmap = adev->dmap_out; 953 int this_fragment; 954 955 if (dmap->raw_buf == NULL) { 956 printk(KERN_ERR "Sound: Error. Audio interrupt (%d) after freeing buffers.\n", dev); 957 return; 958 } 959 if (dmap->mapping_flags & DMA_MAP_MAPPED) { /* Virtual memory mapped access */ 960 /* mmapped access */ 961 dmap->qhead = (dmap->qhead + 1) % dmap->nbufs; 962 if (dmap->qhead == 0) { /* Wrapped */ 963 dmap->byte_counter += dmap->bytes_in_use; 964 if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */ 965 long decr = dmap->byte_counter; 966 dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use); 967 decr -= dmap->byte_counter; 968 dmap->user_counter -= decr; 969 } 970 } 971 dmap->qlen++; /* Yes increment it (don't decrement) */ 972 if (!(adev->flags & DMA_AUTOMODE)) 973 dmap->flags &= ~DMA_ACTIVE; 974 dmap->counts[dmap->qhead] = dmap->fragment_size; 975 DMAbuf_launch_output(dev, dmap); 976 finish_output_interrupt(dev, dmap); 977 return; 978 } 979 save_flags(flags); 980 cli(); 981 982 dmap->qlen--; 983 this_fragment = dmap->qhead; 984 dmap->qhead = (dmap->qhead + 1) % dmap->nbufs; 985 986 if (dmap->qhead == 0) { /* Wrapped */ 987 dmap->byte_counter += dmap->bytes_in_use; 988 if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */ 989 long decr = dmap->byte_counter; 990 dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use); 991 decr -= dmap->byte_counter; 992 dmap->user_counter -= decr; 993 } 994 } 995 if (!(adev->flags & DMA_AUTOMODE)) 996 dmap->flags &= ~DMA_ACTIVE; 997 998 /* 999 * This is dmap->qlen <= 0 except when closing when 1000 * dmap->qlen < 0 1001 */ 1002 1003 while (dmap->qlen <= -dmap->closing) { 1004 dmap->underrun_count++; 1005 dmap->qlen++; 1006 if ((dmap->flags & DMA_DIRTY) && dmap->applic_profile != APF_CPUINTENS) { 1007 dmap->flags &= ~DMA_DIRTY; 1008 memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte, 1009 adev->dmap_out->buffsize); 1010 } 1011 dmap->user_counter += dmap->fragment_size; 1012 dmap->qtail = (dmap->qtail + 1) % dmap->nbufs; 1013 } 1014 if (dmap->qlen > 0) 1015 DMAbuf_launch_output(dev, dmap); 1016 restore_flags(flags); 1017 finish_output_interrupt(dev, dmap); 1018} 1019 1020void DMAbuf_outputintr(int dev, int notify_only) 1021{ 1022 struct audio_operations *adev = audio_devs[dev]; 1023 unsigned long flags; 1024 struct dma_buffparms *dmap = adev->dmap_out; 1025 1026 save_flags(flags); 1027 cli(); 1028 if (!(dmap->flags & DMA_NODMA)) { 1029 int chan = dmap->dma, pos, n; 1030 unsigned long f; 1031 1032 f=claim_dma_lock(); 1033 1034 if(!isa_dma_bridge_buggy) 1035 disable_dma(dmap->dma); 1036 clear_dma_ff(chan); 1037 pos = dmap->bytes_in_use - get_dma_residue(chan); 1038 if(!isa_dma_bridge_buggy) 1039 enable_dma(dmap->dma); 1040 release_dma_lock(f); 1041 1042 pos = pos / dmap->fragment_size; /* Actual qhead */ 1043 if (pos < 0 || pos >= dmap->nbufs) 1044 pos = 0; 1045 n = 0; 1046 while (dmap->qhead != pos && n++ < dmap->nbufs) 1047 do_outputintr(dev, notify_only); 1048 } 1049 else 1050 do_outputintr(dev, notify_only); 1051 restore_flags(flags); 1052} 1053 1054static void do_inputintr(int dev) 1055{ 1056 struct audio_operations *adev = audio_devs[dev]; 1057 struct dma_buffparms *dmap = adev->dmap_in; 1058 1059 if (dmap->raw_buf == NULL) { 1060 printk(KERN_ERR "Sound: Fatal error. Audio interrupt after freeing buffers.\n"); 1061 return; 1062 } 1063 if (dmap->mapping_flags & DMA_MAP_MAPPED) { 1064 dmap->qtail = (dmap->qtail + 1) % dmap->nbufs; 1065 if (dmap->qtail == 0) { /* Wrapped */ 1066 dmap->byte_counter += dmap->bytes_in_use; 1067 if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */ 1068 long decr = dmap->byte_counter; 1069 dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use) + dmap->bytes_in_use; 1070 decr -= dmap->byte_counter; 1071 dmap->user_counter -= decr; 1072 } 1073 } 1074 dmap->qlen++; 1075 1076 if (!(adev->flags & DMA_AUTOMODE)) { 1077 if (dmap->needs_reorg) 1078 reorganize_buffers(dev, dmap, 0); 1079 local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use,DMA_MODE_READ); 1080 adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size, 1081 dmap->fragment_size, 1); 1082 if (adev->d->trigger) 1083 adev->d->trigger(dev, adev->enable_bits * adev->go); 1084 } 1085 dmap->flags |= DMA_ACTIVE; 1086 } else if (dmap->qlen >= (dmap->nbufs - 1)) { 1087 printk(KERN_WARNING "Sound: Recording overrun\n"); 1088 dmap->underrun_count++; 1089 1090 /* Just throw away the oldest fragment but keep the engine running */ 1091 dmap->qhead = (dmap->qhead + 1) % dmap->nbufs; 1092 dmap->qtail = (dmap->qtail + 1) % dmap->nbufs; 1093 } else if (dmap->qlen >= 0 && dmap->qlen < dmap->nbufs) { 1094 dmap->qlen++; 1095 dmap->qtail = (dmap->qtail + 1) % dmap->nbufs; 1096 if (dmap->qtail == 0) { /* Wrapped */ 1097 dmap->byte_counter += dmap->bytes_in_use; 1098 if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */ 1099 long decr = dmap->byte_counter; 1100 dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use) + dmap->bytes_in_use; 1101 decr -= dmap->byte_counter; 1102 dmap->user_counter -= decr; 1103 } 1104 } 1105 } 1106 if (!(adev->flags & DMA_AUTOMODE) || (dmap->flags & DMA_NODMA)) { 1107 local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use, DMA_MODE_READ); 1108 adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size, dmap->fragment_size, 1); 1109 if (adev->d->trigger) 1110 adev->d->trigger(dev,adev->enable_bits * adev->go); 1111 } 1112 dmap->flags |= DMA_ACTIVE; 1113 if (dmap->qlen > 0) 1114 { 1115 wake_up(&adev->in_sleeper); 1116 wake_up(&adev->poll_sleeper); 1117 } 1118} 1119 1120void DMAbuf_inputintr(int dev) 1121{ 1122 struct audio_operations *adev = audio_devs[dev]; 1123 struct dma_buffparms *dmap = adev->dmap_in; 1124 unsigned long flags; 1125 1126 save_flags(flags); 1127 cli(); 1128 1129 if (!(dmap->flags & DMA_NODMA)) { 1130 int chan = dmap->dma, pos, n; 1131 unsigned long f; 1132 1133 f=claim_dma_lock(); 1134 if(!isa_dma_bridge_buggy) 1135 disable_dma(dmap->dma); 1136 clear_dma_ff(chan); 1137 pos = dmap->bytes_in_use - get_dma_residue(chan); 1138 if(!isa_dma_bridge_buggy) 1139 enable_dma(dmap->dma); 1140 release_dma_lock(f); 1141 1142 pos = pos / dmap->fragment_size; /* Actual qhead */ 1143 if (pos < 0 || pos >= dmap->nbufs) 1144 pos = 0; 1145 1146 n = 0; 1147 while (dmap->qtail != pos && ++n < dmap->nbufs) 1148 do_inputintr(dev); 1149 } else 1150 do_inputintr(dev); 1151 restore_flags(flags); 1152} 1153 1154int DMAbuf_open_dma(int dev) 1155{ 1156 /* 1157 * NOTE! This routine opens only the primary DMA channel (output). 1158 */ 1159 struct audio_operations *adev = audio_devs[dev]; 1160 int err; 1161 1162 if ((err = open_dmap(adev, OPEN_READWRITE, adev->dmap_out)) < 0) 1163 return -EBUSY; 1164 dma_init_buffers(adev->dmap_out); 1165 adev->dmap_out->flags |= DMA_ALLOC_DONE; 1166 adev->dmap_out->fragment_size = adev->dmap_out->buffsize; 1167 1168 if (adev->dmap_out->dma >= 0) { 1169 unsigned long flags; 1170 1171 flags=claim_dma_lock(); 1172 clear_dma_ff(adev->dmap_out->dma); 1173 disable_dma(adev->dmap_out->dma); 1174 release_dma_lock(flags); 1175 } 1176 return 0; 1177} 1178 1179void DMAbuf_close_dma(int dev) 1180{ 1181 close_dmap(audio_devs[dev], audio_devs[dev]->dmap_out); 1182} 1183 1184void DMAbuf_init(int dev, int dma1, int dma2) 1185{ 1186 struct audio_operations *adev = audio_devs[dev]; 1187 /* 1188 * NOTE! This routine could be called several times. 1189 */ 1190 1191 /* drag in audio_syms.o */ 1192 { 1193 extern char audio_syms_symbol; 1194 audio_syms_symbol = 0; 1195 } 1196 1197 if (adev && adev->dmap_out == NULL) { 1198 if (adev->d == NULL) 1199 panic("OSS: audio_devs[%d]->d == NULL\n", dev); 1200 1201 if (adev->parent_dev) { /* Use DMA map of the parent dev */ 1202 int parent = adev->parent_dev - 1; 1203 adev->dmap_out = audio_devs[parent]->dmap_out; 1204 adev->dmap_in = audio_devs[parent]->dmap_in; 1205 } else { 1206 adev->dmap_out = adev->dmap_in = &adev->dmaps[0]; 1207 adev->dmap_out->dma = dma1; 1208 if (adev->flags & DMA_DUPLEX) { 1209 adev->dmap_in = &adev->dmaps[1]; 1210 adev->dmap_in->dma = dma2; 1211 } 1212 } 1213 /* Persistent DMA buffers allocated here */ 1214 if (sound_dmap_flag == DMAP_KEEP_ON_CLOSE) { 1215 if (adev->dmap_in->raw_buf == NULL) 1216 sound_alloc_dmap(adev->dmap_in); 1217 if (adev->dmap_out->raw_buf == NULL) 1218 sound_alloc_dmap(adev->dmap_out); 1219 } 1220 } 1221} 1222 1223/* No kernel lock - DMAbuf_activate_recording protected by global cli/sti */ 1224static unsigned int poll_input(struct file * file, int dev, poll_table *wait) 1225{ 1226 struct audio_operations *adev = audio_devs[dev]; 1227 struct dma_buffparms *dmap = adev->dmap_in; 1228 1229 if (!(adev->open_mode & OPEN_READ)) 1230 return 0; 1231 if (dmap->mapping_flags & DMA_MAP_MAPPED) { 1232 if (dmap->qlen) 1233 return POLLIN | POLLRDNORM; 1234 return 0; 1235 } 1236 if (dmap->dma_mode != DMODE_INPUT) { 1237 if (dmap->dma_mode == DMODE_NONE && 1238 adev->enable_bits & PCM_ENABLE_INPUT && 1239 !dmap->qlen && adev->go) { 1240 unsigned long flags; 1241 1242 save_flags(flags); 1243 cli(); 1244 DMAbuf_activate_recording(dev, dmap); 1245 restore_flags(flags); 1246 } 1247 return 0; 1248 } 1249 if (!dmap->qlen) 1250 return 0; 1251 return POLLIN | POLLRDNORM; 1252} 1253 1254static unsigned int poll_output(struct file * file, int dev, poll_table *wait) 1255{ 1256 struct audio_operations *adev = audio_devs[dev]; 1257 struct dma_buffparms *dmap = adev->dmap_out; 1258 1259 if (!(adev->open_mode & OPEN_WRITE)) 1260 return 0; 1261 if (dmap->mapping_flags & DMA_MAP_MAPPED) { 1262 if (dmap->qlen) 1263 return POLLOUT | POLLWRNORM; 1264 return 0; 1265 } 1266 if (dmap->dma_mode == DMODE_INPUT) 1267 return 0; 1268 if (dmap->dma_mode == DMODE_NONE) 1269 return POLLOUT | POLLWRNORM; 1270 if (!DMAbuf_space_in_queue(dev)) 1271 return 0; 1272 return POLLOUT | POLLWRNORM; 1273} 1274 1275unsigned int DMAbuf_poll(struct file * file, int dev, poll_table *wait) 1276{ 1277 struct audio_operations *adev = audio_devs[dev]; 1278 poll_wait(file, &adev->poll_sleeper, wait); 1279 return poll_input(file, dev, wait) | poll_output(file, dev, wait); 1280} 1281 1282void DMAbuf_deinit(int dev) 1283{ 1284 struct audio_operations *adev = audio_devs[dev]; 1285 /* This routine is called when driver is being unloaded */ 1286 if (!adev) 1287 return; 1288 1289 /* Persistent DMA buffers deallocated here */ 1290 if (sound_dmap_flag == DMAP_KEEP_ON_CLOSE) { 1291 sound_free_dmap(adev->dmap_out); 1292 if (adev->flags & DMA_DUPLEX) 1293 sound_free_dmap(adev->dmap_in); 1294 } 1295} 1296