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