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