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 "endpoint.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 */ 36 static 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 */ 45 static 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 */ 53 static 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 */ 100 static 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 */ 115 static 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 */ 145 void 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 */ 166 static 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 */ 189 static 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 */ 212 int 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 subs->freqshift = INT_MIN; 229 /* calculate max. frequency */ 230 if (subs->maxpacksize) { 231 /* whatever fits into a max. size packet */ 232 maxsize = subs->maxpacksize; 233 subs->freqmax = (maxsize / (frame_bits >> 3)) 234 << (16 - subs->datainterval); 235 } else { 236 /* no max. packet size: just take 25% higher than nominal */ 237 subs->freqmax = subs->freqn + (subs->freqn >> 2); 238 maxsize = ((subs->freqmax + 0xffff) * (frame_bits >> 3)) 239 >> (16 - subs->datainterval); 240 } 241 subs->phase = 0; 242 243 if (subs->fill_max) 244 subs->curpacksize = subs->maxpacksize; 245 else 246 subs->curpacksize = maxsize; 247 248 if (snd_usb_get_speed(subs->dev) != USB_SPEED_FULL) 249 packs_per_ms = 8 >> subs->datainterval; 250 else 251 packs_per_ms = 1; 252 253 if (is_playback) { 254 urb_packs = max(chip->nrpacks, 1); 255 urb_packs = min(urb_packs, (unsigned int)MAX_PACKS); 256 } else 257 urb_packs = 1; 258 urb_packs *= packs_per_ms; 259 if (subs->syncpipe) 260 urb_packs = min(urb_packs, 1U << subs->syncinterval); 261 262 /* decide how many packets to be used */ 263 if (is_playback) { 264 unsigned int minsize, maxpacks; 265 /* determine how small a packet can be */ 266 minsize = (subs->freqn >> (16 - subs->datainterval)) 267 * (frame_bits >> 3); 268 /* with sync from device, assume it can be 12% lower */ 269 if (subs->syncpipe) 270 minsize -= minsize >> 3; 271 minsize = max(minsize, 1u); 272 total_packs = (period_bytes + minsize - 1) / minsize; 273 /* we need at least two URBs for queueing */ 274 if (total_packs < 2) { 275 total_packs = 2; 276 } else { 277 /* and we don't want too long a queue either */ 278 maxpacks = max(MAX_QUEUE * packs_per_ms, urb_packs * 2); 279 total_packs = min(total_packs, maxpacks); 280 } 281 } else { 282 while (urb_packs > 1 && urb_packs * maxsize >= period_bytes) 283 urb_packs >>= 1; 284 total_packs = MAX_URBS * urb_packs; 285 } 286 subs->nurbs = (total_packs + urb_packs - 1) / urb_packs; 287 if (subs->nurbs > MAX_URBS) { 288 /* too much... */ 289 subs->nurbs = MAX_URBS; 290 total_packs = MAX_URBS * urb_packs; 291 } else if (subs->nurbs < 2) { 292 /* too little - we need at least two packets 293 * to ensure contiguous playback/capture 294 */ 295 subs->nurbs = 2; 296 } 297 298 /* allocate and initialize data urbs */ 299 for (i = 0; i < subs->nurbs; i++) { 300 struct snd_urb_ctx *u = &subs->dataurb[i]; 301 u->index = i; 302 u->subs = subs; 303 u->packets = (i + 1) * total_packs / subs->nurbs 304 - i * total_packs / subs->nurbs; 305 u->buffer_size = maxsize * u->packets; 306 if (subs->fmt_type == UAC_FORMAT_TYPE_II) 307 u->packets++; /* for transfer delimiter */ 308 u->urb = usb_alloc_urb(u->packets, GFP_KERNEL); 309 if (!u->urb) 310 goto out_of_memory; 311 u->urb->transfer_buffer = 312 usb_alloc_coherent(subs->dev, u->buffer_size, 313 GFP_KERNEL, &u->urb->transfer_dma); 314 if (!u->urb->transfer_buffer) 315 goto out_of_memory; 316 u->urb->pipe = subs->datapipe; 317 u->urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; 318 u->urb->interval = 1 << subs->datainterval; 319 u->urb->context = u; 320 u->urb->complete = snd_complete_urb; 321 } 322 323 if (subs->syncpipe) { 324 /* allocate and initialize sync urbs */ 325 subs->syncbuf = usb_alloc_coherent(subs->dev, SYNC_URBS * 4, 326 GFP_KERNEL, &subs->sync_dma); 327 if (!subs->syncbuf) 328 goto out_of_memory; 329 for (i = 0; i < SYNC_URBS; i++) { 330 struct snd_urb_ctx *u = &subs->syncurb[i]; 331 u->index = i; 332 u->subs = subs; 333 u->packets = 1; 334 u->urb = usb_alloc_urb(1, GFP_KERNEL); 335 if (!u->urb) 336 goto out_of_memory; 337 u->urb->transfer_buffer = subs->syncbuf + i * 4; 338 u->urb->transfer_dma = subs->sync_dma + i * 4; 339 u->urb->transfer_buffer_length = 4; 340 u->urb->pipe = subs->syncpipe; 341 u->urb->transfer_flags = URB_ISO_ASAP | 342 URB_NO_TRANSFER_DMA_MAP; 343 u->urb->number_of_packets = 1; 344 u->urb->interval = 1 << subs->syncinterval; 345 u->urb->context = u; 346 u->urb->complete = snd_complete_sync_urb; 347 } 348 } 349 return 0; 350 351 out_of_memory: 352 snd_usb_release_substream_urbs(subs, 0); 353 return -ENOMEM; 354 } 355 356 /* 357 * prepare urb for full speed capture sync pipe 358 * 359 * fill the length and offset of each urb descriptor. 360 * the fixed 10.14 frequency is passed through the pipe. 361 */ 362 static int prepare_capture_sync_urb(struct snd_usb_substream *subs, 363 struct snd_pcm_runtime *runtime, 364 struct urb *urb) 365 { 366 unsigned char *cp = urb->transfer_buffer; 367 struct snd_urb_ctx *ctx = urb->context; 368 369 urb->dev = ctx->subs->dev; /* we need to set this at each time */ 370 urb->iso_frame_desc[0].length = 3; 371 urb->iso_frame_desc[0].offset = 0; 372 cp[0] = subs->freqn >> 2; 373 cp[1] = subs->freqn >> 10; 374 cp[2] = subs->freqn >> 18; 375 return 0; 376 } 377 378 /* 379 * prepare urb for high speed capture sync pipe 380 * 381 * fill the length and offset of each urb descriptor. 382 * the fixed 12.13 frequency is passed as 16.16 through the pipe. 383 */ 384 static int prepare_capture_sync_urb_hs(struct snd_usb_substream *subs, 385 struct snd_pcm_runtime *runtime, 386 struct urb *urb) 387 { 388 unsigned char *cp = urb->transfer_buffer; 389 struct snd_urb_ctx *ctx = urb->context; 390 391 urb->dev = ctx->subs->dev; /* we need to set this at each time */ 392 urb->iso_frame_desc[0].length = 4; 393 urb->iso_frame_desc[0].offset = 0; 394 cp[0] = subs->freqn; 395 cp[1] = subs->freqn >> 8; 396 cp[2] = subs->freqn >> 16; 397 cp[3] = subs->freqn >> 24; 398 return 0; 399 } 400 401 /* 402 * process after capture sync complete 403 * - nothing to do 404 */ 405 static int retire_capture_sync_urb(struct snd_usb_substream *subs, 406 struct snd_pcm_runtime *runtime, 407 struct urb *urb) 408 { 409 return 0; 410 } 411 412 /* 413 * prepare urb for capture data pipe 414 * 415 * fill the offset and length of each descriptor. 416 * 417 * we use a temporary buffer to write the captured data. 418 * since the length of written data is determined by host, we cannot 419 * write onto the pcm buffer directly... the data is thus copied 420 * later at complete callback to the global buffer. 421 */ 422 static int prepare_capture_urb(struct snd_usb_substream *subs, 423 struct snd_pcm_runtime *runtime, 424 struct urb *urb) 425 { 426 int i, offs; 427 struct snd_urb_ctx *ctx = urb->context; 428 429 offs = 0; 430 urb->dev = ctx->subs->dev; /* we need to set this at each time */ 431 for (i = 0; i < ctx->packets; i++) { 432 urb->iso_frame_desc[i].offset = offs; 433 urb->iso_frame_desc[i].length = subs->curpacksize; 434 offs += subs->curpacksize; 435 } 436 urb->transfer_buffer_length = offs; 437 urb->number_of_packets = ctx->packets; 438 return 0; 439 } 440 441 /* 442 * process after capture complete 443 * 444 * copy the data from each desctiptor to the pcm buffer, and 445 * update the current position. 446 */ 447 static int retire_capture_urb(struct snd_usb_substream *subs, 448 struct snd_pcm_runtime *runtime, 449 struct urb *urb) 450 { 451 unsigned long flags; 452 unsigned char *cp; 453 int i; 454 unsigned int stride, frames, bytes, oldptr; 455 int period_elapsed = 0; 456 457 stride = runtime->frame_bits >> 3; 458 459 for (i = 0; i < urb->number_of_packets; i++) { 460 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset; 461 if (urb->iso_frame_desc[i].status) { 462 snd_printd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status); 463 // continue; 464 } 465 bytes = urb->iso_frame_desc[i].actual_length; 466 frames = bytes / stride; 467 if (!subs->txfr_quirk) 468 bytes = frames * stride; 469 if (bytes % (runtime->sample_bits >> 3) != 0) { 470 #ifdef CONFIG_SND_DEBUG_VERBOSE 471 int oldbytes = bytes; 472 #endif 473 bytes = frames * stride; 474 snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n", 475 oldbytes, bytes); 476 } 477 /* update the current pointer */ 478 spin_lock_irqsave(&subs->lock, flags); 479 oldptr = subs->hwptr_done; 480 subs->hwptr_done += bytes; 481 if (subs->hwptr_done >= runtime->buffer_size * stride) 482 subs->hwptr_done -= runtime->buffer_size * stride; 483 frames = (bytes + (oldptr % stride)) / stride; 484 subs->transfer_done += frames; 485 if (subs->transfer_done >= runtime->period_size) { 486 subs->transfer_done -= runtime->period_size; 487 period_elapsed = 1; 488 } 489 spin_unlock_irqrestore(&subs->lock, flags); 490 /* copy a data chunk */ 491 if (oldptr + bytes > runtime->buffer_size * stride) { 492 unsigned int bytes1 = 493 runtime->buffer_size * stride - oldptr; 494 memcpy(runtime->dma_area + oldptr, cp, bytes1); 495 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1); 496 } else { 497 memcpy(runtime->dma_area + oldptr, cp, bytes); 498 } 499 } 500 if (period_elapsed) 501 snd_pcm_period_elapsed(subs->pcm_substream); 502 return 0; 503 } 504 505 /* 506 * Process after capture complete when paused. Nothing to do. 507 */ 508 static int retire_paused_capture_urb(struct snd_usb_substream *subs, 509 struct snd_pcm_runtime *runtime, 510 struct urb *urb) 511 { 512 return 0; 513 } 514 515 516 /* 517 * prepare urb for playback sync pipe 518 * 519 * set up the offset and length to receive the current frequency. 520 */ 521 static 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 = min(4u, ctx->subs->syncmaxsize); 529 urb->iso_frame_desc[0].offset = 0; 530 return 0; 531 } 532 533 /* 534 * process after playback sync complete 535 * 536 * Full speed devices report feedback values in 10.14 format as samples per 537 * frame, high speed devices in 16.16 format as samples per microframe. 538 * Because the Audio Class 1 spec was written before USB 2.0, many high speed 539 * devices use a wrong interpretation, some others use an entirely different 540 * format. Therefore, we cannot predict what format any particular device uses 541 * and must detect it automatically. 542 */ 543 static int retire_playback_sync_urb(struct snd_usb_substream *subs, 544 struct snd_pcm_runtime *runtime, 545 struct urb *urb) 546 { 547 unsigned int f; 548 int shift; 549 unsigned long flags; 550 551 if (urb->iso_frame_desc[0].status != 0 || 552 urb->iso_frame_desc[0].actual_length < 3) 553 return 0; 554 555 f = le32_to_cpup(urb->transfer_buffer); 556 if (urb->iso_frame_desc[0].actual_length == 3) 557 f &= 0x00ffffff; 558 else 559 f &= 0x0fffffff; 560 if (f == 0) 561 return 0; 562 563 if (unlikely(subs->freqshift == INT_MIN)) { 564 /* 565 * The first time we see a feedback value, determine its format 566 * by shifting it left or right until it matches the nominal 567 * frequency value. This assumes that the feedback does not 568 * differ from the nominal value more than +50% or -25%. 569 */ 570 shift = 0; 571 while (f < subs->freqn - subs->freqn / 4) { 572 f <<= 1; 573 shift++; 574 } 575 while (f > subs->freqn + subs->freqn / 2) { 576 f >>= 1; 577 shift--; 578 } 579 subs->freqshift = shift; 580 } 581 else if (subs->freqshift >= 0) 582 f <<= subs->freqshift; 583 else 584 f >>= -subs->freqshift; 585 586 if (likely(f >= subs->freqn - subs->freqn / 8 && f <= subs->freqmax)) { 587 /* 588 * If the frequency looks valid, set it. 589 * This value is referred to in prepare_playback_urb(). 590 */ 591 spin_lock_irqsave(&subs->lock, flags); 592 subs->freqm = f; 593 spin_unlock_irqrestore(&subs->lock, flags); 594 } else { 595 /* 596 * Out of range; maybe the shift value is wrong. 597 * Reset it so that we autodetect again the next time. 598 */ 599 subs->freqshift = INT_MIN; 600 } 601 602 return 0; 603 } 604 605 /* determine the number of frames in the next packet */ 606 static int snd_usb_audio_next_packet_size(struct snd_usb_substream *subs) 607 { 608 if (subs->fill_max) 609 return subs->maxframesize; 610 else { 611 subs->phase = (subs->phase & 0xffff) 612 + (subs->freqm << subs->datainterval); 613 return min(subs->phase >> 16, subs->maxframesize); 614 } 615 } 616 617 /* 618 * Prepare urb for streaming before playback starts or when paused. 619 * 620 * We don't have any data, so we send silence. 621 */ 622 static int prepare_nodata_playback_urb(struct snd_usb_substream *subs, 623 struct snd_pcm_runtime *runtime, 624 struct urb *urb) 625 { 626 unsigned int i, offs, counts; 627 struct snd_urb_ctx *ctx = urb->context; 628 int stride = runtime->frame_bits >> 3; 629 630 offs = 0; 631 urb->dev = ctx->subs->dev; 632 for (i = 0; i < ctx->packets; ++i) { 633 counts = snd_usb_audio_next_packet_size(subs); 634 urb->iso_frame_desc[i].offset = offs * stride; 635 urb->iso_frame_desc[i].length = counts * stride; 636 offs += counts; 637 } 638 urb->number_of_packets = ctx->packets; 639 urb->transfer_buffer_length = offs * stride; 640 memset(urb->transfer_buffer, 641 runtime->format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0, 642 offs * stride); 643 return 0; 644 } 645 646 /* 647 * prepare urb for playback data pipe 648 * 649 * Since a URB can handle only a single linear buffer, we must use double 650 * buffering when the data to be transferred overflows the buffer boundary. 651 * To avoid inconsistencies when updating hwptr_done, we use double buffering 652 * for all URBs. 653 */ 654 static int prepare_playback_urb(struct snd_usb_substream *subs, 655 struct snd_pcm_runtime *runtime, 656 struct urb *urb) 657 { 658 int i, stride; 659 unsigned int counts, frames, bytes; 660 unsigned long flags; 661 int period_elapsed = 0; 662 struct snd_urb_ctx *ctx = urb->context; 663 664 stride = runtime->frame_bits >> 3; 665 666 frames = 0; 667 urb->dev = ctx->subs->dev; /* we need to set this at each time */ 668 urb->number_of_packets = 0; 669 spin_lock_irqsave(&subs->lock, flags); 670 for (i = 0; i < ctx->packets; i++) { 671 counts = snd_usb_audio_next_packet_size(subs); 672 /* set up descriptor */ 673 urb->iso_frame_desc[i].offset = frames * stride; 674 urb->iso_frame_desc[i].length = counts * stride; 675 frames += counts; 676 urb->number_of_packets++; 677 subs->transfer_done += counts; 678 if (subs->transfer_done >= runtime->period_size) { 679 subs->transfer_done -= runtime->period_size; 680 period_elapsed = 1; 681 if (subs->fmt_type == UAC_FORMAT_TYPE_II) { 682 if (subs->transfer_done > 0) { 683 /* FIXME: fill-max mode is not 684 * supported yet */ 685 frames -= subs->transfer_done; 686 counts -= subs->transfer_done; 687 urb->iso_frame_desc[i].length = 688 counts * stride; 689 subs->transfer_done = 0; 690 } 691 i++; 692 if (i < ctx->packets) { 693 /* add a transfer delimiter */ 694 urb->iso_frame_desc[i].offset = 695 frames * stride; 696 urb->iso_frame_desc[i].length = 0; 697 urb->number_of_packets++; 698 } 699 break; 700 } 701 } 702 if (period_elapsed) /* finish at the period boundary */ 703 break; 704 } 705 bytes = frames * stride; 706 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) { 707 /* err, the transferred area goes over buffer boundary. */ 708 unsigned int bytes1 = 709 runtime->buffer_size * stride - subs->hwptr_done; 710 memcpy(urb->transfer_buffer, 711 runtime->dma_area + subs->hwptr_done, bytes1); 712 memcpy(urb->transfer_buffer + bytes1, 713 runtime->dma_area, bytes - bytes1); 714 } else { 715 memcpy(urb->transfer_buffer, 716 runtime->dma_area + subs->hwptr_done, bytes); 717 } 718 subs->hwptr_done += bytes; 719 if (subs->hwptr_done >= runtime->buffer_size * stride) 720 subs->hwptr_done -= runtime->buffer_size * stride; 721 722 /* update delay with exact number of samples queued */ 723 runtime->delay = subs->last_delay; 724 runtime->delay += frames; 725 subs->last_delay = runtime->delay; 726 727 /* realign last_frame_number */ 728 subs->last_frame_number = usb_get_current_frame_number(subs->dev); 729 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */ 730 731 spin_unlock_irqrestore(&subs->lock, flags); 732 urb->transfer_buffer_length = bytes; 733 if (period_elapsed) 734 snd_pcm_period_elapsed(subs->pcm_substream); 735 return 0; 736 } 737 738 /* 739 * process after playback data complete 740 * - decrease the delay count again 741 */ 742 static int retire_playback_urb(struct snd_usb_substream *subs, 743 struct snd_pcm_runtime *runtime, 744 struct urb *urb) 745 { 746 unsigned long flags; 747 int stride = runtime->frame_bits >> 3; 748 int processed = urb->transfer_buffer_length / stride; 749 int est_delay; 750 751 spin_lock_irqsave(&subs->lock, flags); 752 753 est_delay = snd_usb_pcm_delay(subs, runtime->rate); 754 /* update delay with exact number of samples played */ 755 if (processed > subs->last_delay) 756 subs->last_delay = 0; 757 else 758 subs->last_delay -= processed; 759 runtime->delay = subs->last_delay; 760 761 /* 762 * Report when delay estimate is off by more than 2ms. 763 * The error should be lower than 2ms since the estimate relies 764 * on two reads of a counter updated every ms. 765 */ 766 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2) 767 snd_printk(KERN_DEBUG "delay: estimated %d, actual %d\n", 768 est_delay, subs->last_delay); 769 770 spin_unlock_irqrestore(&subs->lock, flags); 771 return 0; 772 } 773 774 static const char *usb_error_string(int err) 775 { 776 switch (err) { 777 case -ENODEV: 778 return "no device"; 779 case -ENOENT: 780 return "endpoint not enabled"; 781 case -EPIPE: 782 return "endpoint stalled"; 783 case -ENOSPC: 784 return "not enough bandwidth"; 785 case -ESHUTDOWN: 786 return "device disabled"; 787 case -EHOSTUNREACH: 788 return "device suspended"; 789 case -EINVAL: 790 case -EAGAIN: 791 case -EFBIG: 792 case -EMSGSIZE: 793 return "internal error"; 794 default: 795 return "unknown error"; 796 } 797 } 798 799 /* 800 * set up and start data/sync urbs 801 */ 802 static int start_urbs(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime) 803 { 804 unsigned int i; 805 int err; 806 807 if (subs->stream->chip->shutdown) 808 return -EBADFD; 809 810 for (i = 0; i < subs->nurbs; i++) { 811 if (snd_BUG_ON(!subs->dataurb[i].urb)) 812 return -EINVAL; 813 if (subs->ops.prepare(subs, runtime, subs->dataurb[i].urb) < 0) { 814 snd_printk(KERN_ERR "cannot prepare datapipe for urb %d\n", i); 815 goto __error; 816 } 817 } 818 if (subs->syncpipe) { 819 for (i = 0; i < SYNC_URBS; i++) { 820 if (snd_BUG_ON(!subs->syncurb[i].urb)) 821 return -EINVAL; 822 if (subs->ops.prepare_sync(subs, runtime, subs->syncurb[i].urb) < 0) { 823 snd_printk(KERN_ERR "cannot prepare syncpipe for urb %d\n", i); 824 goto __error; 825 } 826 } 827 } 828 829 subs->active_mask = 0; 830 subs->unlink_mask = 0; 831 subs->running = 1; 832 for (i = 0; i < subs->nurbs; i++) { 833 err = usb_submit_urb(subs->dataurb[i].urb, GFP_ATOMIC); 834 if (err < 0) { 835 snd_printk(KERN_ERR "cannot submit datapipe " 836 "for urb %d, error %d: %s\n", 837 i, err, usb_error_string(err)); 838 goto __error; 839 } 840 set_bit(i, &subs->active_mask); 841 } 842 if (subs->syncpipe) { 843 for (i = 0; i < SYNC_URBS; i++) { 844 err = usb_submit_urb(subs->syncurb[i].urb, GFP_ATOMIC); 845 if (err < 0) { 846 snd_printk(KERN_ERR "cannot submit syncpipe " 847 "for urb %d, error %d: %s\n", 848 i, err, usb_error_string(err)); 849 goto __error; 850 } 851 set_bit(i + 16, &subs->active_mask); 852 } 853 } 854 return 0; 855 856 __error: 857 // snd_pcm_stop(subs->pcm_substream, SNDRV_PCM_STATE_XRUN); 858 deactivate_urbs(subs, 0, 0); 859 return -EPIPE; 860 } 861 862 863 /* 864 */ 865 static struct snd_urb_ops audio_urb_ops[2] = { 866 { 867 .prepare = prepare_nodata_playback_urb, 868 .retire = retire_playback_urb, 869 .prepare_sync = prepare_playback_sync_urb, 870 .retire_sync = retire_playback_sync_urb, 871 }, 872 { 873 .prepare = prepare_capture_urb, 874 .retire = retire_capture_urb, 875 .prepare_sync = prepare_capture_sync_urb, 876 .retire_sync = retire_capture_sync_urb, 877 }, 878 }; 879 880 /* 881 * initialize the substream instance. 882 */ 883 884 void snd_usb_init_substream(struct snd_usb_stream *as, 885 int stream, struct audioformat *fp) 886 { 887 struct snd_usb_substream *subs = &as->substream[stream]; 888 889 INIT_LIST_HEAD(&subs->fmt_list); 890 spin_lock_init(&subs->lock); 891 892 subs->stream = as; 893 subs->direction = stream; 894 subs->dev = as->chip->dev; 895 subs->txfr_quirk = as->chip->txfr_quirk; 896 subs->ops = audio_urb_ops[stream]; 897 if (snd_usb_get_speed(subs->dev) >= USB_SPEED_HIGH) 898 subs->ops.prepare_sync = prepare_capture_sync_urb_hs; 899 900 snd_usb_set_pcm_ops(as->pcm, stream); 901 902 list_add_tail(&fp->list, &subs->fmt_list); 903 subs->formats |= fp->formats; 904 subs->endpoint = fp->endpoint; 905 subs->num_formats++; 906 subs->fmt_type = fp->fmt_type; 907 } 908 909 int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream, int cmd) 910 { 911 struct snd_usb_substream *subs = substream->runtime->private_data; 912 913 switch (cmd) { 914 case SNDRV_PCM_TRIGGER_START: 915 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 916 subs->ops.prepare = prepare_playback_urb; 917 return 0; 918 case SNDRV_PCM_TRIGGER_STOP: 919 return deactivate_urbs(subs, 0, 0); 920 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 921 subs->ops.prepare = prepare_nodata_playback_urb; 922 return 0; 923 } 924 925 return -EINVAL; 926 } 927 928 int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream, int cmd) 929 { 930 struct snd_usb_substream *subs = substream->runtime->private_data; 931 932 switch (cmd) { 933 case SNDRV_PCM_TRIGGER_START: 934 subs->ops.retire = retire_capture_urb; 935 return start_urbs(subs, substream->runtime); 936 case SNDRV_PCM_TRIGGER_STOP: 937 return deactivate_urbs(subs, 0, 0); 938 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 939 subs->ops.retire = retire_paused_capture_urb; 940 return 0; 941 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 942 subs->ops.retire = retire_capture_urb; 943 return 0; 944 } 945 946 return -EINVAL; 947 } 948 949 int snd_usb_substream_prepare(struct snd_usb_substream *subs, 950 struct snd_pcm_runtime *runtime) 951 { 952 /* clear urbs (to be sure) */ 953 deactivate_urbs(subs, 0, 1); 954 wait_clear_urbs(subs); 955 956 /* for playback, submit the URBs now; otherwise, the first hwptr_done 957 * updates for all URBs would happen at the same time when starting */ 958 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) { 959 subs->ops.prepare = prepare_nodata_playback_urb; 960 return start_urbs(subs, runtime); 961 } 962 963 return 0; 964 } 965 966