1/* 2 * This program is free software; you can redistribute it and/or modify 3 * it under the terms of the GNU General Public License as published by 4 * the Free Software Foundation; either version 2 of the License, or 5 * (at your option) any later version. 6 * 7 * This program is distributed in the hope that it will be useful, 8 * but WITHOUT ANY WARRANTY; without even the implied warranty of 9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 10 * GNU General Public License for more details. 11 * 12 * You should have received a copy of the GNU General Public License 13 * along with this program; if not, write to the Free Software 14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 15 * 16 */ 17 18#include <linux/gfp.h> 19#include <linux/init.h> 20#include <linux/usb.h> 21#include <linux/usb/audio.h> 22 23#include <sound/core.h> 24#include <sound/pcm.h> 25 26#include "usbaudio.h" 27#include "helper.h" 28#include "card.h" 29#include "urb.h" 30#include "pcm.h" 31 32/* 33 * convert a sampling rate into our full speed format (fs/1000 in Q16.16) 34 * this will overflow at approx 524 kHz 35 */ 36static inline unsigned get_usb_full_speed_rate(unsigned int rate) 37{ 38 return ((rate << 13) + 62) / 125; 39} 40 41/* 42 * convert a sampling rate into USB high speed format (fs/8000 in Q16.16) 43 * this will overflow at approx 4 MHz 44 */ 45static inline unsigned get_usb_high_speed_rate(unsigned int rate) 46{ 47 return ((rate << 10) + 62) / 125; 48} 49 50/* 51 * unlink active urbs. 52 */ 53static int deactivate_urbs(struct snd_usb_substream *subs, int force, int can_sleep) 54{ 55 struct snd_usb_audio *chip = subs->stream->chip; 56 unsigned int i; 57 int async; 58 59 subs->running = 0; 60 61 if (!force && subs->stream->chip->shutdown) /* to be sure... */ 62 return -EBADFD; 63 64 async = !can_sleep && chip->async_unlink; 65 66 if (!async && in_interrupt()) 67 return 0; 68 69 for (i = 0; i < subs->nurbs; i++) { 70 if (test_bit(i, &subs->active_mask)) { 71 if (!test_and_set_bit(i, &subs->unlink_mask)) { 72 struct urb *u = subs->dataurb[i].urb; 73 if (async) 74 usb_unlink_urb(u); 75 else 76 usb_kill_urb(u); 77 } 78 } 79 } 80 if (subs->syncpipe) { 81 for (i = 0; i < SYNC_URBS; i++) { 82 if (test_bit(i+16, &subs->active_mask)) { 83 if (!test_and_set_bit(i+16, &subs->unlink_mask)) { 84 struct urb *u = subs->syncurb[i].urb; 85 if (async) 86 usb_unlink_urb(u); 87 else 88 usb_kill_urb(u); 89 } 90 } 91 } 92 } 93 return 0; 94} 95 96 97/* 98 * release a urb data 99 */ 100static void release_urb_ctx(struct snd_urb_ctx *u) 101{ 102 if (u->urb) { 103 if (u->buffer_size) 104 usb_free_coherent(u->subs->dev, u->buffer_size, 105 u->urb->transfer_buffer, 106 u->urb->transfer_dma); 107 usb_free_urb(u->urb); 108 u->urb = NULL; 109 } 110} 111 112/* 113 * wait until all urbs are processed. 114 */ 115static int wait_clear_urbs(struct snd_usb_substream *subs) 116{ 117 unsigned long end_time = jiffies + msecs_to_jiffies(1000); 118 unsigned int i; 119 int alive; 120 121 do { 122 alive = 0; 123 for (i = 0; i < subs->nurbs; i++) { 124 if (test_bit(i, &subs->active_mask)) 125 alive++; 126 } 127 if (subs->syncpipe) { 128 for (i = 0; i < SYNC_URBS; i++) { 129 if (test_bit(i + 16, &subs->active_mask)) 130 alive++; 131 } 132 } 133 if (! alive) 134 break; 135 schedule_timeout_uninterruptible(1); 136 } while (time_before(jiffies, end_time)); 137 if (alive) 138 snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive); 139 return 0; 140} 141 142/* 143 * release a substream 144 */ 145void snd_usb_release_substream_urbs(struct snd_usb_substream *subs, int force) 146{ 147 int i; 148 149 /* stop urbs (to be sure) */ 150 deactivate_urbs(subs, force, 1); 151 wait_clear_urbs(subs); 152 153 for (i = 0; i < MAX_URBS; i++) 154 release_urb_ctx(&subs->dataurb[i]); 155 for (i = 0; i < SYNC_URBS; i++) 156 release_urb_ctx(&subs->syncurb[i]); 157 usb_free_coherent(subs->dev, SYNC_URBS * 4, 158 subs->syncbuf, subs->sync_dma); 159 subs->syncbuf = NULL; 160 subs->nurbs = 0; 161} 162 163/* 164 * complete callback from data urb 165 */ 166static void snd_complete_urb(struct urb *urb) 167{ 168 struct snd_urb_ctx *ctx = urb->context; 169 struct snd_usb_substream *subs = ctx->subs; 170 struct snd_pcm_substream *substream = ctx->subs->pcm_substream; 171 int err = 0; 172 173 if ((subs->running && subs->ops.retire(subs, substream->runtime, urb)) || 174 !subs->running || /* can be stopped during retire callback */ 175 (err = subs->ops.prepare(subs, substream->runtime, urb)) < 0 || 176 (err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) { 177 clear_bit(ctx->index, &subs->active_mask); 178 if (err < 0) { 179 snd_printd(KERN_ERR "cannot submit urb (err = %d)\n", err); 180 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 181 } 182 } 183} 184 185 186/* 187 * complete callback from sync urb 188 */ 189static void snd_complete_sync_urb(struct urb *urb) 190{ 191 struct snd_urb_ctx *ctx = urb->context; 192 struct snd_usb_substream *subs = ctx->subs; 193 struct snd_pcm_substream *substream = ctx->subs->pcm_substream; 194 int err = 0; 195 196 if ((subs->running && subs->ops.retire_sync(subs, substream->runtime, urb)) || 197 !subs->running || /* can be stopped during retire callback */ 198 (err = subs->ops.prepare_sync(subs, substream->runtime, urb)) < 0 || 199 (err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) { 200 clear_bit(ctx->index + 16, &subs->active_mask); 201 if (err < 0) { 202 snd_printd(KERN_ERR "cannot submit sync urb (err = %d)\n", err); 203 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 204 } 205 } 206} 207 208 209/* 210 * initialize a substream for plaback/capture 211 */ 212int snd_usb_init_substream_urbs(struct snd_usb_substream *subs, 213 unsigned int period_bytes, 214 unsigned int rate, 215 unsigned int frame_bits) 216{ 217 unsigned int maxsize, i; 218 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK; 219 unsigned int urb_packs, total_packs, packs_per_ms; 220 struct snd_usb_audio *chip = subs->stream->chip; 221 222 /* calculate the frequency in 16.16 format */ 223 if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL) 224 subs->freqn = get_usb_full_speed_rate(rate); 225 else 226 subs->freqn = get_usb_high_speed_rate(rate); 227 subs->freqm = subs->freqn; 228 /* calculate max. frequency */ 229 if (subs->maxpacksize) { 230 /* whatever fits into a max. size packet */ 231 maxsize = subs->maxpacksize; 232 subs->freqmax = (maxsize / (frame_bits >> 3)) 233 << (16 - subs->datainterval); 234 } else { 235 /* no max. packet size: just take 25% higher than nominal */ 236 subs->freqmax = subs->freqn + (subs->freqn >> 2); 237 maxsize = ((subs->freqmax + 0xffff) * (frame_bits >> 3)) 238 >> (16 - subs->datainterval); 239 } 240 subs->phase = 0; 241 242 if (subs->fill_max) 243 subs->curpacksize = subs->maxpacksize; 244 else 245 subs->curpacksize = maxsize; 246 247 if (snd_usb_get_speed(subs->dev) == USB_SPEED_HIGH) 248 packs_per_ms = 8 >> subs->datainterval; 249 else 250 packs_per_ms = 1; 251 252 if (is_playback) { 253 urb_packs = max(chip->nrpacks, 1); 254 urb_packs = min(urb_packs, (unsigned int)MAX_PACKS); 255 } else 256 urb_packs = 1; 257 urb_packs *= packs_per_ms; 258 if (subs->syncpipe) 259 urb_packs = min(urb_packs, 1U << subs->syncinterval); 260 261 /* decide how many packets to be used */ 262 if (is_playback) { 263 unsigned int minsize, maxpacks; 264 /* determine how small a packet can be */ 265 minsize = (subs->freqn >> (16 - subs->datainterval)) 266 * (frame_bits >> 3); 267 /* with sync from device, assume it can be 12% lower */ 268 if (subs->syncpipe) 269 minsize -= minsize >> 3; 270 minsize = max(minsize, 1u); 271 total_packs = (period_bytes + minsize - 1) / minsize; 272 /* we need at least two URBs for queueing */ 273 if (total_packs < 2) { 274 total_packs = 2; 275 } else { 276 /* and we don't want too long a queue either */ 277 maxpacks = max(MAX_QUEUE * packs_per_ms, urb_packs * 2); 278 total_packs = min(total_packs, maxpacks); 279 } 280 } else { 281 while (urb_packs > 1 && urb_packs * maxsize >= period_bytes) 282 urb_packs >>= 1; 283 total_packs = MAX_URBS * urb_packs; 284 } 285 subs->nurbs = (total_packs + urb_packs - 1) / urb_packs; 286 if (subs->nurbs > MAX_URBS) { 287 /* too much... */ 288 subs->nurbs = MAX_URBS; 289 total_packs = MAX_URBS * urb_packs; 290 } else if (subs->nurbs < 2) { 291 /* too little - we need at least two packets 292 * to ensure contiguous playback/capture 293 */ 294 subs->nurbs = 2; 295 } 296 297 /* allocate and initialize data urbs */ 298 for (i = 0; i < subs->nurbs; i++) { 299 struct snd_urb_ctx *u = &subs->dataurb[i]; 300 u->index = i; 301 u->subs = subs; 302 u->packets = (i + 1) * total_packs / subs->nurbs 303 - i * total_packs / subs->nurbs; 304 u->buffer_size = maxsize * u->packets; 305 if (subs->fmt_type == UAC_FORMAT_TYPE_II) 306 u->packets++; /* for transfer delimiter */ 307 u->urb = usb_alloc_urb(u->packets, GFP_KERNEL); 308 if (!u->urb) 309 goto out_of_memory; 310 u->urb->transfer_buffer = 311 usb_alloc_coherent(subs->dev, u->buffer_size, 312 GFP_KERNEL, &u->urb->transfer_dma); 313 if (!u->urb->transfer_buffer) 314 goto out_of_memory; 315 u->urb->pipe = subs->datapipe; 316 u->urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; 317 u->urb->interval = 1 << subs->datainterval; 318 u->urb->context = u; 319 u->urb->complete = snd_complete_urb; 320 } 321 322 if (subs->syncpipe) { 323 /* allocate and initialize sync urbs */ 324 subs->syncbuf = usb_alloc_coherent(subs->dev, SYNC_URBS * 4, 325 GFP_KERNEL, &subs->sync_dma); 326 if (!subs->syncbuf) 327 goto out_of_memory; 328 for (i = 0; i < SYNC_URBS; i++) { 329 struct snd_urb_ctx *u = &subs->syncurb[i]; 330 u->index = i; 331 u->subs = subs; 332 u->packets = 1; 333 u->urb = usb_alloc_urb(1, GFP_KERNEL); 334 if (!u->urb) 335 goto out_of_memory; 336 u->urb->transfer_buffer = subs->syncbuf + i * 4; 337 u->urb->transfer_dma = subs->sync_dma + i * 4; 338 u->urb->transfer_buffer_length = 4; 339 u->urb->pipe = subs->syncpipe; 340 u->urb->transfer_flags = URB_ISO_ASAP | 341 URB_NO_TRANSFER_DMA_MAP; 342 u->urb->number_of_packets = 1; 343 u->urb->interval = 1 << subs->syncinterval; 344 u->urb->context = u; 345 u->urb->complete = snd_complete_sync_urb; 346 } 347 } 348 return 0; 349 350out_of_memory: 351 snd_usb_release_substream_urbs(subs, 0); 352 return -ENOMEM; 353} 354 355/* 356 * prepare urb for full speed capture sync pipe 357 * 358 * fill the length and offset of each urb descriptor. 359 * the fixed 10.14 frequency is passed through the pipe. 360 */ 361static int prepare_capture_sync_urb(struct snd_usb_substream *subs, 362 struct snd_pcm_runtime *runtime, 363 struct urb *urb) 364{ 365 unsigned char *cp = urb->transfer_buffer; 366 struct snd_urb_ctx *ctx = urb->context; 367 368 urb->dev = ctx->subs->dev; /* we need to set this at each time */ 369 urb->iso_frame_desc[0].length = 3; 370 urb->iso_frame_desc[0].offset = 0; 371 cp[0] = subs->freqn >> 2; 372 cp[1] = subs->freqn >> 10; 373 cp[2] = subs->freqn >> 18; 374 return 0; 375} 376 377/* 378 * prepare urb for high speed capture sync pipe 379 * 380 * fill the length and offset of each urb descriptor. 381 * the fixed 12.13 frequency is passed as 16.16 through the pipe. 382 */ 383static int prepare_capture_sync_urb_hs(struct snd_usb_substream *subs, 384 struct snd_pcm_runtime *runtime, 385 struct urb *urb) 386{ 387 unsigned char *cp = urb->transfer_buffer; 388 struct snd_urb_ctx *ctx = urb->context; 389 390 urb->dev = ctx->subs->dev; /* we need to set this at each time */ 391 urb->iso_frame_desc[0].length = 4; 392 urb->iso_frame_desc[0].offset = 0; 393 cp[0] = subs->freqn; 394 cp[1] = subs->freqn >> 8; 395 cp[2] = subs->freqn >> 16; 396 cp[3] = subs->freqn >> 24; 397 return 0; 398} 399 400/* 401 * process after capture sync complete 402 * - nothing to do 403 */ 404static int retire_capture_sync_urb(struct snd_usb_substream *subs, 405 struct snd_pcm_runtime *runtime, 406 struct urb *urb) 407{ 408 return 0; 409} 410 411/* 412 * prepare urb for capture data pipe 413 * 414 * fill the offset and length of each descriptor. 415 * 416 * we use a temporary buffer to write the captured data. 417 * since the length of written data is determined by host, we cannot 418 * write onto the pcm buffer directly... the data is thus copied 419 * later at complete callback to the global buffer. 420 */ 421static int prepare_capture_urb(struct snd_usb_substream *subs, 422 struct snd_pcm_runtime *runtime, 423 struct urb *urb) 424{ 425 int i, offs; 426 struct snd_urb_ctx *ctx = urb->context; 427 428 offs = 0; 429 urb->dev = ctx->subs->dev; /* we need to set this at each time */ 430 for (i = 0; i < ctx->packets; i++) { 431 urb->iso_frame_desc[i].offset = offs; 432 urb->iso_frame_desc[i].length = subs->curpacksize; 433 offs += subs->curpacksize; 434 } 435 urb->transfer_buffer_length = offs; 436 urb->number_of_packets = ctx->packets; 437 return 0; 438} 439 440/* 441 * process after capture complete 442 * 443 * copy the data from each desctiptor to the pcm buffer, and 444 * update the current position. 445 */ 446static int retire_capture_urb(struct snd_usb_substream *subs, 447 struct snd_pcm_runtime *runtime, 448 struct urb *urb) 449{ 450 unsigned long flags; 451 unsigned char *cp; 452 int i; 453 unsigned int stride, frames, bytes, oldptr; 454 int period_elapsed = 0; 455 456 stride = runtime->frame_bits >> 3; 457 458 for (i = 0; i < urb->number_of_packets; i++) { 459 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset; 460 if (urb->iso_frame_desc[i].status) { 461 snd_printd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status); 462 // continue; 463 } 464 bytes = urb->iso_frame_desc[i].actual_length; 465 frames = bytes / stride; 466 if (!subs->txfr_quirk) 467 bytes = frames * stride; 468 if (bytes % (runtime->sample_bits >> 3) != 0) { 469#ifdef CONFIG_SND_DEBUG_VERBOSE 470 int oldbytes = bytes; 471#endif 472 bytes = frames * stride; 473 snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n", 474 oldbytes, bytes); 475 } 476 /* update the current pointer */ 477 spin_lock_irqsave(&subs->lock, flags); 478 oldptr = subs->hwptr_done; 479 subs->hwptr_done += bytes; 480 if (subs->hwptr_done >= runtime->buffer_size * stride) 481 subs->hwptr_done -= runtime->buffer_size * stride; 482 frames = (bytes + (oldptr % stride)) / stride; 483 subs->transfer_done += frames; 484 if (subs->transfer_done >= runtime->period_size) { 485 subs->transfer_done -= runtime->period_size; 486 period_elapsed = 1; 487 } 488 spin_unlock_irqrestore(&subs->lock, flags); 489 /* copy a data chunk */ 490 if (oldptr + bytes > runtime->buffer_size * stride) { 491 unsigned int bytes1 = 492 runtime->buffer_size * stride - oldptr; 493 memcpy(runtime->dma_area + oldptr, cp, bytes1); 494 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1); 495 } else { 496 memcpy(runtime->dma_area + oldptr, cp, bytes); 497 } 498 } 499 if (period_elapsed) 500 snd_pcm_period_elapsed(subs->pcm_substream); 501 return 0; 502} 503 504/* 505 * Process after capture complete when paused. Nothing to do. 506 */ 507static int retire_paused_capture_urb(struct snd_usb_substream *subs, 508 struct snd_pcm_runtime *runtime, 509 struct urb *urb) 510{ 511 return 0; 512} 513 514 515/* 516 * prepare urb for full speed playback sync pipe 517 * 518 * set up the offset and length to receive the current frequency. 519 */ 520 521static int prepare_playback_sync_urb(struct snd_usb_substream *subs, 522 struct snd_pcm_runtime *runtime, 523 struct urb *urb) 524{ 525 struct snd_urb_ctx *ctx = urb->context; 526 527 urb->dev = ctx->subs->dev; /* we need to set this at each time */ 528 urb->iso_frame_desc[0].length = 3; 529 urb->iso_frame_desc[0].offset = 0; 530 return 0; 531} 532 533/* 534 * prepare urb for high speed playback sync pipe 535 * 536 * set up the offset and length to receive the current frequency. 537 */ 538 539static int prepare_playback_sync_urb_hs(struct snd_usb_substream *subs, 540 struct snd_pcm_runtime *runtime, 541 struct urb *urb) 542{ 543 struct snd_urb_ctx *ctx = urb->context; 544 545 urb->dev = ctx->subs->dev; /* we need to set this at each time */ 546 urb->iso_frame_desc[0].length = 4; 547 urb->iso_frame_desc[0].offset = 0; 548 return 0; 549} 550 551/* 552 * process after full speed playback sync complete 553 * 554 * retrieve the current 10.14 frequency from pipe, and set it. 555 * the value is referred in prepare_playback_urb(). 556 */ 557static int retire_playback_sync_urb(struct snd_usb_substream *subs, 558 struct snd_pcm_runtime *runtime, 559 struct urb *urb) 560{ 561 unsigned int f; 562 unsigned long flags; 563 564 if (urb->iso_frame_desc[0].status == 0 && 565 urb->iso_frame_desc[0].actual_length == 3) { 566 f = combine_triple((u8*)urb->transfer_buffer) << 2; 567 if (f >= subs->freqn - subs->freqn / 8 && f <= subs->freqmax) { 568 spin_lock_irqsave(&subs->lock, flags); 569 subs->freqm = f; 570 spin_unlock_irqrestore(&subs->lock, flags); 571 } 572 } 573 574 return 0; 575} 576 577/* 578 * process after high speed playback sync complete 579 * 580 * retrieve the current 12.13 frequency from pipe, and set it. 581 * the value is referred in prepare_playback_urb(). 582 */ 583static int retire_playback_sync_urb_hs(struct snd_usb_substream *subs, 584 struct snd_pcm_runtime *runtime, 585 struct urb *urb) 586{ 587 unsigned int f; 588 unsigned long flags; 589 590 if (urb->iso_frame_desc[0].status == 0 && 591 urb->iso_frame_desc[0].actual_length == 4) { 592 f = combine_quad((u8*)urb->transfer_buffer) & 0x0fffffff; 593 if (f >= subs->freqn - subs->freqn / 8 && f <= subs->freqmax) { 594 spin_lock_irqsave(&subs->lock, flags); 595 subs->freqm = f; 596 spin_unlock_irqrestore(&subs->lock, flags); 597 } 598 } 599 600 return 0; 601} 602 603/* 604 * process after E-Mu 0202/0404/Tracker Pre high speed playback sync complete 605 * 606 * These devices return the number of samples per packet instead of the number 607 * of samples per microframe. 608 */ 609static int retire_playback_sync_urb_hs_emu(struct snd_usb_substream *subs, 610 struct snd_pcm_runtime *runtime, 611 struct urb *urb) 612{ 613 unsigned int f; 614 unsigned long flags; 615 616 if (urb->iso_frame_desc[0].status == 0 && 617 urb->iso_frame_desc[0].actual_length == 4) { 618 f = combine_quad((u8*)urb->transfer_buffer) & 0x0fffffff; 619 f >>= subs->datainterval; 620 if (f >= subs->freqn - subs->freqn / 8 && f <= subs->freqmax) { 621 spin_lock_irqsave(&subs->lock, flags); 622 subs->freqm = f; 623 spin_unlock_irqrestore(&subs->lock, flags); 624 } 625 } 626 627 return 0; 628} 629 630/* determine the number of frames in the next packet */ 631static int snd_usb_audio_next_packet_size(struct snd_usb_substream *subs) 632{ 633 if (subs->fill_max) 634 return subs->maxframesize; 635 else { 636 subs->phase = (subs->phase & 0xffff) 637 + (subs->freqm << subs->datainterval); 638 return min(subs->phase >> 16, subs->maxframesize); 639 } 640} 641 642/* 643 * Prepare urb for streaming before playback starts or when paused. 644 * 645 * We don't have any data, so we send silence. 646 */ 647static int prepare_nodata_playback_urb(struct snd_usb_substream *subs, 648 struct snd_pcm_runtime *runtime, 649 struct urb *urb) 650{ 651 unsigned int i, offs, counts; 652 struct snd_urb_ctx *ctx = urb->context; 653 int stride = runtime->frame_bits >> 3; 654 655 offs = 0; 656 urb->dev = ctx->subs->dev; 657 for (i = 0; i < ctx->packets; ++i) { 658 counts = snd_usb_audio_next_packet_size(subs); 659 urb->iso_frame_desc[i].offset = offs * stride; 660 urb->iso_frame_desc[i].length = counts * stride; 661 offs += counts; 662 } 663 urb->number_of_packets = ctx->packets; 664 urb->transfer_buffer_length = offs * stride; 665 memset(urb->transfer_buffer, 666 runtime->format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0, 667 offs * stride); 668 return 0; 669} 670 671/* 672 * prepare urb for playback data pipe 673 * 674 * Since a URB can handle only a single linear buffer, we must use double 675 * buffering when the data to be transferred overflows the buffer boundary. 676 * To avoid inconsistencies when updating hwptr_done, we use double buffering 677 * for all URBs. 678 */ 679static int prepare_playback_urb(struct snd_usb_substream *subs, 680 struct snd_pcm_runtime *runtime, 681 struct urb *urb) 682{ 683 int i, stride; 684 unsigned int counts, frames, bytes; 685 unsigned long flags; 686 int period_elapsed = 0; 687 struct snd_urb_ctx *ctx = urb->context; 688 689 stride = runtime->frame_bits >> 3; 690 691 frames = 0; 692 urb->dev = ctx->subs->dev; /* we need to set this at each time */ 693 urb->number_of_packets = 0; 694 spin_lock_irqsave(&subs->lock, flags); 695 for (i = 0; i < ctx->packets; i++) { 696 counts = snd_usb_audio_next_packet_size(subs); 697 /* set up descriptor */ 698 urb->iso_frame_desc[i].offset = frames * stride; 699 urb->iso_frame_desc[i].length = counts * stride; 700 frames += counts; 701 urb->number_of_packets++; 702 subs->transfer_done += counts; 703 if (subs->transfer_done >= runtime->period_size) { 704 subs->transfer_done -= runtime->period_size; 705 period_elapsed = 1; 706 if (subs->fmt_type == UAC_FORMAT_TYPE_II) { 707 if (subs->transfer_done > 0) { 708 frames -= subs->transfer_done; 709 counts -= subs->transfer_done; 710 urb->iso_frame_desc[i].length = 711 counts * stride; 712 subs->transfer_done = 0; 713 } 714 i++; 715 if (i < ctx->packets) { 716 /* add a transfer delimiter */ 717 urb->iso_frame_desc[i].offset = 718 frames * stride; 719 urb->iso_frame_desc[i].length = 0; 720 urb->number_of_packets++; 721 } 722 break; 723 } 724 } 725 if (period_elapsed) /* finish at the period boundary */ 726 break; 727 } 728 bytes = frames * stride; 729 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) { 730 /* err, the transferred area goes over buffer boundary. */ 731 unsigned int bytes1 = 732 runtime->buffer_size * stride - subs->hwptr_done; 733 memcpy(urb->transfer_buffer, 734 runtime->dma_area + subs->hwptr_done, bytes1); 735 memcpy(urb->transfer_buffer + bytes1, 736 runtime->dma_area, bytes - bytes1); 737 } else { 738 memcpy(urb->transfer_buffer, 739 runtime->dma_area + subs->hwptr_done, bytes); 740 } 741 subs->hwptr_done += bytes; 742 if (subs->hwptr_done >= runtime->buffer_size * stride) 743 subs->hwptr_done -= runtime->buffer_size * stride; 744 runtime->delay += frames; 745 spin_unlock_irqrestore(&subs->lock, flags); 746 urb->transfer_buffer_length = bytes; 747 if (period_elapsed) 748 snd_pcm_period_elapsed(subs->pcm_substream); 749 return 0; 750} 751 752/* 753 * process after playback data complete 754 * - decrease the delay count again 755 */ 756static int retire_playback_urb(struct snd_usb_substream *subs, 757 struct snd_pcm_runtime *runtime, 758 struct urb *urb) 759{ 760 unsigned long flags; 761 int stride = runtime->frame_bits >> 3; 762 int processed = urb->transfer_buffer_length / stride; 763 764 spin_lock_irqsave(&subs->lock, flags); 765 if (processed > runtime->delay) 766 runtime->delay = 0; 767 else 768 runtime->delay -= processed; 769 spin_unlock_irqrestore(&subs->lock, flags); 770 return 0; 771} 772 773static const char *usb_error_string(int err) 774{ 775 switch (err) { 776 case -ENODEV: 777 return "no device"; 778 case -ENOENT: 779 return "endpoint not enabled"; 780 case -EPIPE: 781 return "endpoint stalled"; 782 case -ENOSPC: 783 return "not enough bandwidth"; 784 case -ESHUTDOWN: 785 return "device disabled"; 786 case -EHOSTUNREACH: 787 return "device suspended"; 788 case -EINVAL: 789 case -EAGAIN: 790 case -EFBIG: 791 case -EMSGSIZE: 792 return "internal error"; 793 default: 794 return "unknown error"; 795 } 796} 797 798/* 799 * set up and start data/sync urbs 800 */ 801static int start_urbs(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime) 802{ 803 unsigned int i; 804 int err; 805 806 if (subs->stream->chip->shutdown) 807 return -EBADFD; 808 809 for (i = 0; i < subs->nurbs; i++) { 810 if (snd_BUG_ON(!subs->dataurb[i].urb)) 811 return -EINVAL; 812 if (subs->ops.prepare(subs, runtime, subs->dataurb[i].urb) < 0) { 813 snd_printk(KERN_ERR "cannot prepare datapipe for urb %d\n", i); 814 goto __error; 815 } 816 } 817 if (subs->syncpipe) { 818 for (i = 0; i < SYNC_URBS; i++) { 819 if (snd_BUG_ON(!subs->syncurb[i].urb)) 820 return -EINVAL; 821 if (subs->ops.prepare_sync(subs, runtime, subs->syncurb[i].urb) < 0) { 822 snd_printk(KERN_ERR "cannot prepare syncpipe for urb %d\n", i); 823 goto __error; 824 } 825 } 826 } 827 828 subs->active_mask = 0; 829 subs->unlink_mask = 0; 830 subs->running = 1; 831 for (i = 0; i < subs->nurbs; i++) { 832 err = usb_submit_urb(subs->dataurb[i].urb, GFP_ATOMIC); 833 if (err < 0) { 834 snd_printk(KERN_ERR "cannot submit datapipe " 835 "for urb %d, error %d: %s\n", 836 i, err, usb_error_string(err)); 837 goto __error; 838 } 839 set_bit(i, &subs->active_mask); 840 } 841 if (subs->syncpipe) { 842 for (i = 0; i < SYNC_URBS; i++) { 843 err = usb_submit_urb(subs->syncurb[i].urb, GFP_ATOMIC); 844 if (err < 0) { 845 snd_printk(KERN_ERR "cannot submit syncpipe " 846 "for urb %d, error %d: %s\n", 847 i, err, usb_error_string(err)); 848 goto __error; 849 } 850 set_bit(i + 16, &subs->active_mask); 851 } 852 } 853 return 0; 854 855 __error: 856 // snd_pcm_stop(subs->pcm_substream, SNDRV_PCM_STATE_XRUN); 857 deactivate_urbs(subs, 0, 0); 858 return -EPIPE; 859} 860 861 862/* 863 */ 864static struct snd_urb_ops audio_urb_ops[2] = { 865 { 866 .prepare = prepare_nodata_playback_urb, 867 .retire = retire_playback_urb, 868 .prepare_sync = prepare_playback_sync_urb, 869 .retire_sync = retire_playback_sync_urb, 870 }, 871 { 872 .prepare = prepare_capture_urb, 873 .retire = retire_capture_urb, 874 .prepare_sync = prepare_capture_sync_urb, 875 .retire_sync = retire_capture_sync_urb, 876 }, 877}; 878 879static struct snd_urb_ops audio_urb_ops_high_speed[2] = { 880 { 881 .prepare = prepare_nodata_playback_urb, 882 .retire = retire_playback_urb, 883 .prepare_sync = prepare_playback_sync_urb_hs, 884 .retire_sync = retire_playback_sync_urb_hs, 885 }, 886 { 887 .prepare = prepare_capture_urb, 888 .retire = retire_capture_urb, 889 .prepare_sync = prepare_capture_sync_urb_hs, 890 .retire_sync = retire_capture_sync_urb, 891 }, 892}; 893 894/* 895 * initialize the substream instance. 896 */ 897 898void snd_usb_init_substream(struct snd_usb_stream *as, 899 int stream, struct audioformat *fp) 900{ 901 struct snd_usb_substream *subs = &as->substream[stream]; 902 903 INIT_LIST_HEAD(&subs->fmt_list); 904 spin_lock_init(&subs->lock); 905 906 subs->stream = as; 907 subs->direction = stream; 908 subs->dev = as->chip->dev; 909 subs->txfr_quirk = as->chip->txfr_quirk; 910 if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL) { 911 subs->ops = audio_urb_ops[stream]; 912 } else { 913 subs->ops = audio_urb_ops_high_speed[stream]; 914 switch (as->chip->usb_id) { 915 case USB_ID(0x041e, 0x3f02): /* E-Mu 0202 USB */ 916 case USB_ID(0x041e, 0x3f04): /* E-Mu 0404 USB */ 917 case USB_ID(0x041e, 0x3f0a): /* E-Mu Tracker Pre */ 918 subs->ops.retire_sync = retire_playback_sync_urb_hs_emu; 919 break; 920 case USB_ID(0x0763, 0x2080): /* M-Audio Fast Track Ultra 8 */ 921 case USB_ID(0x0763, 0x2081): /* M-Audio Fast Track Ultra 8R */ 922 subs->ops.prepare_sync = prepare_playback_sync_urb; 923 subs->ops.retire_sync = retire_playback_sync_urb; 924 break; 925 } 926 } 927 928 snd_usb_set_pcm_ops(as->pcm, stream); 929 930 list_add_tail(&fp->list, &subs->fmt_list); 931 subs->formats |= fp->formats; 932 subs->endpoint = fp->endpoint; 933 subs->num_formats++; 934 subs->fmt_type = fp->fmt_type; 935} 936 937int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream, int cmd) 938{ 939 struct snd_usb_substream *subs = substream->runtime->private_data; 940 941 switch (cmd) { 942 case SNDRV_PCM_TRIGGER_START: 943 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 944 subs->ops.prepare = prepare_playback_urb; 945 return 0; 946 case SNDRV_PCM_TRIGGER_STOP: 947 return deactivate_urbs(subs, 0, 0); 948 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 949 subs->ops.prepare = prepare_nodata_playback_urb; 950 return 0; 951 } 952 953 return -EINVAL; 954} 955 956int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream, int cmd) 957{ 958 struct snd_usb_substream *subs = substream->runtime->private_data; 959 960 switch (cmd) { 961 case SNDRV_PCM_TRIGGER_START: 962 subs->ops.retire = retire_capture_urb; 963 return start_urbs(subs, substream->runtime); 964 case SNDRV_PCM_TRIGGER_STOP: 965 return deactivate_urbs(subs, 0, 0); 966 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 967 subs->ops.retire = retire_paused_capture_urb; 968 return 0; 969 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 970 subs->ops.retire = retire_capture_urb; 971 return 0; 972 } 973 974 return -EINVAL; 975} 976 977int snd_usb_substream_prepare(struct snd_usb_substream *subs, 978 struct snd_pcm_runtime *runtime) 979{ 980 /* clear urbs (to be sure) */ 981 deactivate_urbs(subs, 0, 1); 982 wait_clear_urbs(subs); 983 984 /* for playback, submit the URBs now; otherwise, the first hwptr_done 985 * updates for all URBs would happen at the same time when starting */ 986 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) { 987 subs->ops.prepare = prepare_nodata_playback_urb; 988 return start_urbs(subs, runtime); 989 } 990 991 return 0; 992} 993