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#include <linux/init.h> 18#include <linux/slab.h> 19#include <linux/bitrev.h> 20#include <linux/ratelimit.h> 21#include <linux/usb.h> 22#include <linux/usb/audio.h> 23#include <linux/usb/audio-v2.h> 24 25#include <sound/core.h> 26#include <sound/pcm.h> 27#include <sound/pcm_params.h> 28 29#include "usbaudio.h" 30#include "card.h" 31#include "quirks.h" 32#include "debug.h" 33#include "endpoint.h" 34#include "helper.h" 35#include "pcm.h" 36#include "clock.h" 37#include "power.h" 38 39#define SUBSTREAM_FLAG_DATA_EP_STARTED 0 40#define SUBSTREAM_FLAG_SYNC_EP_STARTED 1 41 42/* return the estimated delay based on USB frame counters */ 43snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs, 44 unsigned int rate) 45{ 46 int current_frame_number; 47 int frame_diff; 48 int est_delay; 49 50 if (!subs->last_delay) 51 return 0; /* short path */ 52 53 current_frame_number = usb_get_current_frame_number(subs->dev); 54 /* 55 * HCD implementations use different widths, use lower 8 bits. 56 * The delay will be managed up to 256ms, which is more than 57 * enough 58 */ 59 frame_diff = (current_frame_number - subs->last_frame_number) & 0xff; 60 61 /* Approximation based on number of samples per USB frame (ms), 62 some truncation for 44.1 but the estimate is good enough */ 63 est_delay = frame_diff * rate / 1000; 64 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) 65 est_delay = subs->last_delay - est_delay; 66 else 67 est_delay = subs->last_delay + est_delay; 68 69 if (est_delay < 0) 70 est_delay = 0; 71 return est_delay; 72} 73 74/* 75 * return the current pcm pointer. just based on the hwptr_done value. 76 */ 77static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream) 78{ 79 struct snd_usb_substream *subs; 80 unsigned int hwptr_done; 81 82 subs = (struct snd_usb_substream *)substream->runtime->private_data; 83 if (atomic_read(&subs->stream->chip->shutdown)) 84 return SNDRV_PCM_POS_XRUN; 85 spin_lock(&subs->lock); 86 hwptr_done = subs->hwptr_done; 87 substream->runtime->delay = snd_usb_pcm_delay(subs, 88 substream->runtime->rate); 89 spin_unlock(&subs->lock); 90 return hwptr_done / (substream->runtime->frame_bits >> 3); 91} 92 93/* 94 * find a matching audio format 95 */ 96static struct audioformat *find_format(struct snd_usb_substream *subs) 97{ 98 struct audioformat *fp; 99 struct audioformat *found = NULL; 100 int cur_attr = 0, attr; 101 102 list_for_each_entry(fp, &subs->fmt_list, list) { 103 if (!(fp->formats & pcm_format_to_bits(subs->pcm_format))) 104 continue; 105 if (fp->channels != subs->channels) 106 continue; 107 if (subs->cur_rate < fp->rate_min || 108 subs->cur_rate > fp->rate_max) 109 continue; 110 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) { 111 unsigned int i; 112 for (i = 0; i < fp->nr_rates; i++) 113 if (fp->rate_table[i] == subs->cur_rate) 114 break; 115 if (i >= fp->nr_rates) 116 continue; 117 } 118 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE; 119 if (! found) { 120 found = fp; 121 cur_attr = attr; 122 continue; 123 } 124 /* avoid async out and adaptive in if the other method 125 * supports the same format. 126 * this is a workaround for the case like 127 * M-audio audiophile USB. 128 */ 129 if (attr != cur_attr) { 130 if ((attr == USB_ENDPOINT_SYNC_ASYNC && 131 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) || 132 (attr == USB_ENDPOINT_SYNC_ADAPTIVE && 133 subs->direction == SNDRV_PCM_STREAM_CAPTURE)) 134 continue; 135 if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC && 136 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) || 137 (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE && 138 subs->direction == SNDRV_PCM_STREAM_CAPTURE)) { 139 found = fp; 140 cur_attr = attr; 141 continue; 142 } 143 } 144 /* find the format with the largest max. packet size */ 145 if (fp->maxpacksize > found->maxpacksize) { 146 found = fp; 147 cur_attr = attr; 148 } 149 } 150 return found; 151} 152 153static int init_pitch_v1(struct snd_usb_audio *chip, int iface, 154 struct usb_host_interface *alts, 155 struct audioformat *fmt) 156{ 157 struct usb_device *dev = chip->dev; 158 unsigned int ep; 159 unsigned char data[1]; 160 int err; 161 162 if (get_iface_desc(alts)->bNumEndpoints < 1) 163 return -EINVAL; 164 ep = get_endpoint(alts, 0)->bEndpointAddress; 165 166 data[0] = 1; 167 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR, 168 USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT, 169 UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep, 170 data, sizeof(data))) < 0) { 171 usb_audio_err(chip, "%d:%d: cannot set enable PITCH\n", 172 iface, ep); 173 return err; 174 } 175 176 return 0; 177} 178 179static int init_pitch_v2(struct snd_usb_audio *chip, int iface, 180 struct usb_host_interface *alts, 181 struct audioformat *fmt) 182{ 183 struct usb_device *dev = chip->dev; 184 unsigned char data[1]; 185 int err; 186 187 data[0] = 1; 188 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR, 189 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT, 190 UAC2_EP_CS_PITCH << 8, 0, 191 data, sizeof(data))) < 0) { 192 usb_audio_err(chip, "%d:%d: cannot set enable PITCH (v2)\n", 193 iface, fmt->altsetting); 194 return err; 195 } 196 197 return 0; 198} 199 200/* 201 * initialize the pitch control and sample rate 202 */ 203int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface, 204 struct usb_host_interface *alts, 205 struct audioformat *fmt) 206{ 207 /* if endpoint doesn't have pitch control, bail out */ 208 if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL)) 209 return 0; 210 211 switch (fmt->protocol) { 212 case UAC_VERSION_1: 213 default: 214 return init_pitch_v1(chip, iface, alts, fmt); 215 216 case UAC_VERSION_2: 217 return init_pitch_v2(chip, iface, alts, fmt); 218 } 219} 220 221static int start_endpoints(struct snd_usb_substream *subs, bool can_sleep) 222{ 223 int err; 224 225 if (!subs->data_endpoint) 226 return -EINVAL; 227 228 if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) { 229 struct snd_usb_endpoint *ep = subs->data_endpoint; 230 231 dev_dbg(&subs->dev->dev, "Starting data EP @%p\n", ep); 232 233 ep->data_subs = subs; 234 err = snd_usb_endpoint_start(ep, can_sleep); 235 if (err < 0) { 236 clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags); 237 return err; 238 } 239 } 240 241 if (subs->sync_endpoint && 242 !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) { 243 struct snd_usb_endpoint *ep = subs->sync_endpoint; 244 245 if (subs->data_endpoint->iface != subs->sync_endpoint->iface || 246 subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) { 247 err = usb_set_interface(subs->dev, 248 subs->sync_endpoint->iface, 249 subs->sync_endpoint->altsetting); 250 if (err < 0) { 251 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags); 252 dev_err(&subs->dev->dev, 253 "%d:%d: cannot set interface (%d)\n", 254 subs->sync_endpoint->iface, 255 subs->sync_endpoint->altsetting, err); 256 return -EIO; 257 } 258 } 259 260 dev_dbg(&subs->dev->dev, "Starting sync EP @%p\n", ep); 261 262 ep->sync_slave = subs->data_endpoint; 263 err = snd_usb_endpoint_start(ep, can_sleep); 264 if (err < 0) { 265 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags); 266 return err; 267 } 268 } 269 270 return 0; 271} 272 273static void stop_endpoints(struct snd_usb_substream *subs, bool wait) 274{ 275 if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) 276 snd_usb_endpoint_stop(subs->sync_endpoint); 277 278 if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) 279 snd_usb_endpoint_stop(subs->data_endpoint); 280 281 if (wait) { 282 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint); 283 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint); 284 } 285} 286 287static int search_roland_implicit_fb(struct usb_device *dev, int ifnum, 288 unsigned int altsetting, 289 struct usb_host_interface **alts, 290 unsigned int *ep) 291{ 292 struct usb_interface *iface; 293 struct usb_interface_descriptor *altsd; 294 struct usb_endpoint_descriptor *epd; 295 296 iface = usb_ifnum_to_if(dev, ifnum); 297 if (!iface || iface->num_altsetting < altsetting + 1) 298 return -ENOENT; 299 *alts = &iface->altsetting[altsetting]; 300 altsd = get_iface_desc(*alts); 301 if (altsd->bAlternateSetting != altsetting || 302 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC || 303 (altsd->bInterfaceSubClass != 2 && 304 altsd->bInterfaceProtocol != 2 ) || 305 altsd->bNumEndpoints < 1) 306 return -ENOENT; 307 epd = get_endpoint(*alts, 0); 308 if (!usb_endpoint_is_isoc_in(epd) || 309 (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) != 310 USB_ENDPOINT_USAGE_IMPLICIT_FB) 311 return -ENOENT; 312 *ep = epd->bEndpointAddress; 313 return 0; 314} 315 316static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs, 317 struct usb_device *dev, 318 struct usb_interface_descriptor *altsd, 319 unsigned int attr) 320{ 321 struct usb_host_interface *alts; 322 struct usb_interface *iface; 323 unsigned int ep; 324 325 /* Implicit feedback sync EPs consumers are always playback EPs */ 326 if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK) 327 return 0; 328 329 switch (subs->stream->chip->usb_id) { 330 case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */ 331 case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */ 332 ep = 0x81; 333 iface = usb_ifnum_to_if(dev, 3); 334 335 if (!iface || iface->num_altsetting == 0) 336 return -EINVAL; 337 338 alts = &iface->altsetting[1]; 339 goto add_sync_ep; 340 break; 341 case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */ 342 case USB_ID(0x0763, 0x2081): 343 ep = 0x81; 344 iface = usb_ifnum_to_if(dev, 2); 345 346 if (!iface || iface->num_altsetting == 0) 347 return -EINVAL; 348 349 alts = &iface->altsetting[1]; 350 goto add_sync_ep; 351 } 352 if (attr == USB_ENDPOINT_SYNC_ASYNC && 353 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC && 354 altsd->bInterfaceProtocol == 2 && 355 altsd->bNumEndpoints == 1 && 356 USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ && 357 search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1, 358 altsd->bAlternateSetting, 359 &alts, &ep) >= 0) { 360 goto add_sync_ep; 361 } 362 363 /* No quirk */ 364 return 0; 365 366add_sync_ep: 367 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip, 368 alts, ep, !subs->direction, 369 SND_USB_ENDPOINT_TYPE_DATA); 370 if (!subs->sync_endpoint) 371 return -EINVAL; 372 373 subs->data_endpoint->sync_master = subs->sync_endpoint; 374 375 return 0; 376} 377 378static int set_sync_endpoint(struct snd_usb_substream *subs, 379 struct audioformat *fmt, 380 struct usb_device *dev, 381 struct usb_host_interface *alts, 382 struct usb_interface_descriptor *altsd) 383{ 384 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK; 385 unsigned int ep, attr; 386 bool implicit_fb; 387 int err; 388 389 /* we need a sync pipe in async OUT or adaptive IN mode */ 390 /* check the number of EP, since some devices have broken 391 * descriptors which fool us. if it has only one EP, 392 * assume it as adaptive-out or sync-in. 393 */ 394 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE; 395 396 err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr); 397 if (err < 0) 398 return err; 399 400 if (altsd->bNumEndpoints < 2) 401 return 0; 402 403 if ((is_playback && attr != USB_ENDPOINT_SYNC_ASYNC) || 404 (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE)) 405 return 0; 406 407 /* check sync-pipe endpoint */ 408 /* ... and check descriptor size before accessing bSynchAddress 409 because there is a version of the SB Audigy 2 NX firmware lacking 410 the audio fields in the endpoint descriptors */ 411 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC || 412 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE && 413 get_endpoint(alts, 1)->bSynchAddress != 0)) { 414 dev_err(&dev->dev, 415 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n", 416 fmt->iface, fmt->altsetting, 417 get_endpoint(alts, 1)->bmAttributes, 418 get_endpoint(alts, 1)->bLength, 419 get_endpoint(alts, 1)->bSynchAddress); 420 return -EINVAL; 421 } 422 ep = get_endpoint(alts, 1)->bEndpointAddress; 423 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE && 424 ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) || 425 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) { 426 dev_err(&dev->dev, 427 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n", 428 fmt->iface, fmt->altsetting, 429 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress); 430 return -EINVAL; 431 } 432 433 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK) 434 == USB_ENDPOINT_USAGE_IMPLICIT_FB; 435 436 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip, 437 alts, ep, !subs->direction, 438 implicit_fb ? 439 SND_USB_ENDPOINT_TYPE_DATA : 440 SND_USB_ENDPOINT_TYPE_SYNC); 441 if (!subs->sync_endpoint) 442 return -EINVAL; 443 444 subs->data_endpoint->sync_master = subs->sync_endpoint; 445 446 return 0; 447} 448 449/* 450 * find a matching format and set up the interface 451 */ 452static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt) 453{ 454 struct usb_device *dev = subs->dev; 455 struct usb_host_interface *alts; 456 struct usb_interface_descriptor *altsd; 457 struct usb_interface *iface; 458 int err; 459 460 iface = usb_ifnum_to_if(dev, fmt->iface); 461 if (WARN_ON(!iface)) 462 return -EINVAL; 463 alts = &iface->altsetting[fmt->altset_idx]; 464 altsd = get_iface_desc(alts); 465 if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting)) 466 return -EINVAL; 467 468 if (fmt == subs->cur_audiofmt) 469 return 0; 470 471 /* close the old interface */ 472 if (subs->interface >= 0 && subs->interface != fmt->iface) { 473 err = usb_set_interface(subs->dev, subs->interface, 0); 474 if (err < 0) { 475 dev_err(&dev->dev, 476 "%d:%d: return to setting 0 failed (%d)\n", 477 fmt->iface, fmt->altsetting, err); 478 return -EIO; 479 } 480 subs->interface = -1; 481 subs->altset_idx = 0; 482 } 483 484 /* set interface */ 485 if (subs->interface != fmt->iface || 486 subs->altset_idx != fmt->altset_idx) { 487 488 err = snd_usb_select_mode_quirk(subs, fmt); 489 if (err < 0) 490 return -EIO; 491 492 err = usb_set_interface(dev, fmt->iface, fmt->altsetting); 493 if (err < 0) { 494 dev_err(&dev->dev, 495 "%d:%d: usb_set_interface failed (%d)\n", 496 fmt->iface, fmt->altsetting, err); 497 return -EIO; 498 } 499 dev_dbg(&dev->dev, "setting usb interface %d:%d\n", 500 fmt->iface, fmt->altsetting); 501 subs->interface = fmt->iface; 502 subs->altset_idx = fmt->altset_idx; 503 504 snd_usb_set_interface_quirk(dev); 505 } 506 507 subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip, 508 alts, fmt->endpoint, subs->direction, 509 SND_USB_ENDPOINT_TYPE_DATA); 510 511 if (!subs->data_endpoint) 512 return -EINVAL; 513 514 err = set_sync_endpoint(subs, fmt, dev, alts, altsd); 515 if (err < 0) 516 return err; 517 518 err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt); 519 if (err < 0) 520 return err; 521 522 subs->cur_audiofmt = fmt; 523 524 snd_usb_set_format_quirk(subs, fmt); 525 526 return 0; 527} 528 529/* 530 * Return the score of matching two audioformats. 531 * Veto the audioformat if: 532 * - It has no channels for some reason. 533 * - Requested PCM format is not supported. 534 * - Requested sample rate is not supported. 535 */ 536static int match_endpoint_audioformats(struct snd_usb_substream *subs, 537 struct audioformat *fp, 538 struct audioformat *match, int rate, 539 snd_pcm_format_t pcm_format) 540{ 541 int i; 542 int score = 0; 543 544 if (fp->channels < 1) { 545 dev_dbg(&subs->dev->dev, 546 "%s: (fmt @%p) no channels\n", __func__, fp); 547 return 0; 548 } 549 550 if (!(fp->formats & pcm_format_to_bits(pcm_format))) { 551 dev_dbg(&subs->dev->dev, 552 "%s: (fmt @%p) no match for format %d\n", __func__, 553 fp, pcm_format); 554 return 0; 555 } 556 557 for (i = 0; i < fp->nr_rates; i++) { 558 if (fp->rate_table[i] == rate) { 559 score++; 560 break; 561 } 562 } 563 if (!score) { 564 dev_dbg(&subs->dev->dev, 565 "%s: (fmt @%p) no match for rate %d\n", __func__, 566 fp, rate); 567 return 0; 568 } 569 570 if (fp->channels == match->channels) 571 score++; 572 573 dev_dbg(&subs->dev->dev, 574 "%s: (fmt @%p) score %d\n", __func__, fp, score); 575 576 return score; 577} 578 579/* 580 * Configure the sync ep using the rate and pcm format of the data ep. 581 */ 582static int configure_sync_endpoint(struct snd_usb_substream *subs) 583{ 584 int ret; 585 struct audioformat *fp; 586 struct audioformat *sync_fp = NULL; 587 int cur_score = 0; 588 int sync_period_bytes = subs->period_bytes; 589 struct snd_usb_substream *sync_subs = 590 &subs->stream->substream[subs->direction ^ 1]; 591 592 if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA || 593 !subs->stream) 594 return snd_usb_endpoint_set_params(subs->sync_endpoint, 595 subs->pcm_format, 596 subs->channels, 597 subs->period_bytes, 598 0, 0, 599 subs->cur_rate, 600 subs->cur_audiofmt, 601 NULL); 602 603 /* Try to find the best matching audioformat. */ 604 list_for_each_entry(fp, &sync_subs->fmt_list, list) { 605 int score = match_endpoint_audioformats(subs, 606 fp, subs->cur_audiofmt, 607 subs->cur_rate, subs->pcm_format); 608 609 if (score > cur_score) { 610 sync_fp = fp; 611 cur_score = score; 612 } 613 } 614 615 if (unlikely(sync_fp == NULL)) { 616 dev_err(&subs->dev->dev, 617 "%s: no valid audioformat for sync ep %x found\n", 618 __func__, sync_subs->ep_num); 619 return -EINVAL; 620 } 621 622 /* 623 * Recalculate the period bytes if channel number differ between 624 * data and sync ep audioformat. 625 */ 626 if (sync_fp->channels != subs->channels) { 627 sync_period_bytes = (subs->period_bytes / subs->channels) * 628 sync_fp->channels; 629 dev_dbg(&subs->dev->dev, 630 "%s: adjusted sync ep period bytes (%d -> %d)\n", 631 __func__, subs->period_bytes, sync_period_bytes); 632 } 633 634 ret = snd_usb_endpoint_set_params(subs->sync_endpoint, 635 subs->pcm_format, 636 sync_fp->channels, 637 sync_period_bytes, 638 0, 0, 639 subs->cur_rate, 640 sync_fp, 641 NULL); 642 643 return ret; 644} 645 646/* 647 * configure endpoint params 648 * 649 * called during initial setup and upon resume 650 */ 651static int configure_endpoint(struct snd_usb_substream *subs) 652{ 653 int ret; 654 655 /* format changed */ 656 stop_endpoints(subs, true); 657 ret = snd_usb_endpoint_set_params(subs->data_endpoint, 658 subs->pcm_format, 659 subs->channels, 660 subs->period_bytes, 661 subs->period_frames, 662 subs->buffer_periods, 663 subs->cur_rate, 664 subs->cur_audiofmt, 665 subs->sync_endpoint); 666 if (ret < 0) 667 return ret; 668 669 if (subs->sync_endpoint) 670 ret = configure_sync_endpoint(subs); 671 672 return ret; 673} 674 675/* 676 * hw_params callback 677 * 678 * allocate a buffer and set the given audio format. 679 * 680 * so far we use a physically linear buffer although packetize transfer 681 * doesn't need a continuous area. 682 * if sg buffer is supported on the later version of alsa, we'll follow 683 * that. 684 */ 685static int snd_usb_hw_params(struct snd_pcm_substream *substream, 686 struct snd_pcm_hw_params *hw_params) 687{ 688 struct snd_usb_substream *subs = substream->runtime->private_data; 689 struct audioformat *fmt; 690 int ret; 691 692 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream, 693 params_buffer_bytes(hw_params)); 694 if (ret < 0) 695 return ret; 696 697 subs->pcm_format = params_format(hw_params); 698 subs->period_bytes = params_period_bytes(hw_params); 699 subs->period_frames = params_period_size(hw_params); 700 subs->buffer_periods = params_periods(hw_params); 701 subs->channels = params_channels(hw_params); 702 subs->cur_rate = params_rate(hw_params); 703 704 fmt = find_format(subs); 705 if (!fmt) { 706 dev_dbg(&subs->dev->dev, 707 "cannot set format: format = %#x, rate = %d, channels = %d\n", 708 subs->pcm_format, subs->cur_rate, subs->channels); 709 return -EINVAL; 710 } 711 712 ret = snd_usb_lock_shutdown(subs->stream->chip); 713 if (ret < 0) 714 return ret; 715 ret = set_format(subs, fmt); 716 snd_usb_unlock_shutdown(subs->stream->chip); 717 if (ret < 0) 718 return ret; 719 720 subs->interface = fmt->iface; 721 subs->altset_idx = fmt->altset_idx; 722 subs->need_setup_ep = true; 723 724 return 0; 725} 726 727/* 728 * hw_free callback 729 * 730 * reset the audio format and release the buffer 731 */ 732static int snd_usb_hw_free(struct snd_pcm_substream *substream) 733{ 734 struct snd_usb_substream *subs = substream->runtime->private_data; 735 736 subs->cur_audiofmt = NULL; 737 subs->cur_rate = 0; 738 subs->period_bytes = 0; 739 if (!snd_usb_lock_shutdown(subs->stream->chip)) { 740 stop_endpoints(subs, true); 741 snd_usb_endpoint_deactivate(subs->sync_endpoint); 742 snd_usb_endpoint_deactivate(subs->data_endpoint); 743 snd_usb_unlock_shutdown(subs->stream->chip); 744 } 745 return snd_pcm_lib_free_vmalloc_buffer(substream); 746} 747 748/* 749 * prepare callback 750 * 751 * only a few subtle things... 752 */ 753static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream) 754{ 755 struct snd_pcm_runtime *runtime = substream->runtime; 756 struct snd_usb_substream *subs = runtime->private_data; 757 struct usb_host_interface *alts; 758 struct usb_interface *iface; 759 int ret; 760 761 if (! subs->cur_audiofmt) { 762 dev_err(&subs->dev->dev, "no format is specified!\n"); 763 return -ENXIO; 764 } 765 766 ret = snd_usb_lock_shutdown(subs->stream->chip); 767 if (ret < 0) 768 return ret; 769 if (snd_BUG_ON(!subs->data_endpoint)) { 770 ret = -EIO; 771 goto unlock; 772 } 773 774 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint); 775 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint); 776 777 ret = set_format(subs, subs->cur_audiofmt); 778 if (ret < 0) 779 goto unlock; 780 781 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface); 782 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx]; 783 ret = snd_usb_init_sample_rate(subs->stream->chip, 784 subs->cur_audiofmt->iface, 785 alts, 786 subs->cur_audiofmt, 787 subs->cur_rate); 788 if (ret < 0) 789 goto unlock; 790 791 if (subs->need_setup_ep) { 792 ret = configure_endpoint(subs); 793 if (ret < 0) 794 goto unlock; 795 subs->need_setup_ep = false; 796 } 797 798 /* some unit conversions in runtime */ 799 subs->data_endpoint->maxframesize = 800 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize); 801 subs->data_endpoint->curframesize = 802 bytes_to_frames(runtime, subs->data_endpoint->curpacksize); 803 804 /* reset the pointer */ 805 subs->hwptr_done = 0; 806 subs->transfer_done = 0; 807 subs->last_delay = 0; 808 subs->last_frame_number = 0; 809 runtime->delay = 0; 810 811 /* for playback, submit the URBs now; otherwise, the first hwptr_done 812 * updates for all URBs would happen at the same time when starting */ 813 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) 814 ret = start_endpoints(subs, true); 815 816 unlock: 817 snd_usb_unlock_shutdown(subs->stream->chip); 818 return ret; 819} 820 821static struct snd_pcm_hardware snd_usb_hardware = 822{ 823 .info = SNDRV_PCM_INFO_MMAP | 824 SNDRV_PCM_INFO_MMAP_VALID | 825 SNDRV_PCM_INFO_BATCH | 826 SNDRV_PCM_INFO_INTERLEAVED | 827 SNDRV_PCM_INFO_BLOCK_TRANSFER | 828 SNDRV_PCM_INFO_PAUSE, 829 .buffer_bytes_max = 1024 * 1024, 830 .period_bytes_min = 64, 831 .period_bytes_max = 512 * 1024, 832 .periods_min = 2, 833 .periods_max = 1024, 834}; 835 836static int hw_check_valid_format(struct snd_usb_substream *subs, 837 struct snd_pcm_hw_params *params, 838 struct audioformat *fp) 839{ 840 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 841 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 842 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 843 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME); 844 struct snd_mask check_fmts; 845 unsigned int ptime; 846 847 /* check the format */ 848 snd_mask_none(&check_fmts); 849 check_fmts.bits[0] = (u32)fp->formats; 850 check_fmts.bits[1] = (u32)(fp->formats >> 32); 851 snd_mask_intersect(&check_fmts, fmts); 852 if (snd_mask_empty(&check_fmts)) { 853 hwc_debug(" > check: no supported format %d\n", fp->format); 854 return 0; 855 } 856 /* check the channels */ 857 if (fp->channels < ct->min || fp->channels > ct->max) { 858 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max); 859 return 0; 860 } 861 /* check the rate is within the range */ 862 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) { 863 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max); 864 return 0; 865 } 866 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) { 867 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min); 868 return 0; 869 } 870 /* check whether the period time is >= the data packet interval */ 871 if (subs->speed != USB_SPEED_FULL) { 872 ptime = 125 * (1 << fp->datainterval); 873 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) { 874 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max); 875 return 0; 876 } 877 } 878 return 1; 879} 880 881static int hw_rule_rate(struct snd_pcm_hw_params *params, 882 struct snd_pcm_hw_rule *rule) 883{ 884 struct snd_usb_substream *subs = rule->private; 885 struct audioformat *fp; 886 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 887 unsigned int rmin, rmax; 888 int changed; 889 890 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max); 891 changed = 0; 892 rmin = rmax = 0; 893 list_for_each_entry(fp, &subs->fmt_list, list) { 894 if (!hw_check_valid_format(subs, params, fp)) 895 continue; 896 if (changed++) { 897 if (rmin > fp->rate_min) 898 rmin = fp->rate_min; 899 if (rmax < fp->rate_max) 900 rmax = fp->rate_max; 901 } else { 902 rmin = fp->rate_min; 903 rmax = fp->rate_max; 904 } 905 } 906 907 if (!changed) { 908 hwc_debug(" --> get empty\n"); 909 it->empty = 1; 910 return -EINVAL; 911 } 912 913 changed = 0; 914 if (it->min < rmin) { 915 it->min = rmin; 916 it->openmin = 0; 917 changed = 1; 918 } 919 if (it->max > rmax) { 920 it->max = rmax; 921 it->openmax = 0; 922 changed = 1; 923 } 924 if (snd_interval_checkempty(it)) { 925 it->empty = 1; 926 return -EINVAL; 927 } 928 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed); 929 return changed; 930} 931 932 933static int hw_rule_channels(struct snd_pcm_hw_params *params, 934 struct snd_pcm_hw_rule *rule) 935{ 936 struct snd_usb_substream *subs = rule->private; 937 struct audioformat *fp; 938 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 939 unsigned int rmin, rmax; 940 int changed; 941 942 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max); 943 changed = 0; 944 rmin = rmax = 0; 945 list_for_each_entry(fp, &subs->fmt_list, list) { 946 if (!hw_check_valid_format(subs, params, fp)) 947 continue; 948 if (changed++) { 949 if (rmin > fp->channels) 950 rmin = fp->channels; 951 if (rmax < fp->channels) 952 rmax = fp->channels; 953 } else { 954 rmin = fp->channels; 955 rmax = fp->channels; 956 } 957 } 958 959 if (!changed) { 960 hwc_debug(" --> get empty\n"); 961 it->empty = 1; 962 return -EINVAL; 963 } 964 965 changed = 0; 966 if (it->min < rmin) { 967 it->min = rmin; 968 it->openmin = 0; 969 changed = 1; 970 } 971 if (it->max > rmax) { 972 it->max = rmax; 973 it->openmax = 0; 974 changed = 1; 975 } 976 if (snd_interval_checkempty(it)) { 977 it->empty = 1; 978 return -EINVAL; 979 } 980 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed); 981 return changed; 982} 983 984static int hw_rule_format(struct snd_pcm_hw_params *params, 985 struct snd_pcm_hw_rule *rule) 986{ 987 struct snd_usb_substream *subs = rule->private; 988 struct audioformat *fp; 989 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 990 u64 fbits; 991 u32 oldbits[2]; 992 int changed; 993 994 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]); 995 fbits = 0; 996 list_for_each_entry(fp, &subs->fmt_list, list) { 997 if (!hw_check_valid_format(subs, params, fp)) 998 continue; 999 fbits |= fp->formats; 1000 } 1001 1002 oldbits[0] = fmt->bits[0]; 1003 oldbits[1] = fmt->bits[1]; 1004 fmt->bits[0] &= (u32)fbits; 1005 fmt->bits[1] &= (u32)(fbits >> 32); 1006 if (!fmt->bits[0] && !fmt->bits[1]) { 1007 hwc_debug(" --> get empty\n"); 1008 return -EINVAL; 1009 } 1010 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]); 1011 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed); 1012 return changed; 1013} 1014 1015static int hw_rule_period_time(struct snd_pcm_hw_params *params, 1016 struct snd_pcm_hw_rule *rule) 1017{ 1018 struct snd_usb_substream *subs = rule->private; 1019 struct audioformat *fp; 1020 struct snd_interval *it; 1021 unsigned char min_datainterval; 1022 unsigned int pmin; 1023 int changed; 1024 1025 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME); 1026 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max); 1027 min_datainterval = 0xff; 1028 list_for_each_entry(fp, &subs->fmt_list, list) { 1029 if (!hw_check_valid_format(subs, params, fp)) 1030 continue; 1031 min_datainterval = min(min_datainterval, fp->datainterval); 1032 } 1033 if (min_datainterval == 0xff) { 1034 hwc_debug(" --> get empty\n"); 1035 it->empty = 1; 1036 return -EINVAL; 1037 } 1038 pmin = 125 * (1 << min_datainterval); 1039 changed = 0; 1040 if (it->min < pmin) { 1041 it->min = pmin; 1042 it->openmin = 0; 1043 changed = 1; 1044 } 1045 if (snd_interval_checkempty(it)) { 1046 it->empty = 1; 1047 return -EINVAL; 1048 } 1049 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed); 1050 return changed; 1051} 1052 1053/* 1054 * If the device supports unusual bit rates, does the request meet these? 1055 */ 1056static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime, 1057 struct snd_usb_substream *subs) 1058{ 1059 struct audioformat *fp; 1060 int *rate_list; 1061 int count = 0, needs_knot = 0; 1062 int err; 1063 1064 kfree(subs->rate_list.list); 1065 subs->rate_list.list = NULL; 1066 1067 list_for_each_entry(fp, &subs->fmt_list, list) { 1068 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS) 1069 return 0; 1070 count += fp->nr_rates; 1071 if (fp->rates & SNDRV_PCM_RATE_KNOT) 1072 needs_knot = 1; 1073 } 1074 if (!needs_knot) 1075 return 0; 1076 1077 subs->rate_list.list = rate_list = 1078 kmalloc(sizeof(int) * count, GFP_KERNEL); 1079 if (!subs->rate_list.list) 1080 return -ENOMEM; 1081 subs->rate_list.count = count; 1082 subs->rate_list.mask = 0; 1083 count = 0; 1084 list_for_each_entry(fp, &subs->fmt_list, list) { 1085 int i; 1086 for (i = 0; i < fp->nr_rates; i++) 1087 rate_list[count++] = fp->rate_table[i]; 1088 } 1089 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1090 &subs->rate_list); 1091 if (err < 0) 1092 return err; 1093 1094 return 0; 1095} 1096 1097 1098/* 1099 * set up the runtime hardware information. 1100 */ 1101 1102static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs) 1103{ 1104 struct audioformat *fp; 1105 unsigned int pt, ptmin; 1106 int param_period_time_if_needed; 1107 int err; 1108 1109 runtime->hw.formats = subs->formats; 1110 1111 runtime->hw.rate_min = 0x7fffffff; 1112 runtime->hw.rate_max = 0; 1113 runtime->hw.channels_min = 256; 1114 runtime->hw.channels_max = 0; 1115 runtime->hw.rates = 0; 1116 ptmin = UINT_MAX; 1117 /* check min/max rates and channels */ 1118 list_for_each_entry(fp, &subs->fmt_list, list) { 1119 runtime->hw.rates |= fp->rates; 1120 if (runtime->hw.rate_min > fp->rate_min) 1121 runtime->hw.rate_min = fp->rate_min; 1122 if (runtime->hw.rate_max < fp->rate_max) 1123 runtime->hw.rate_max = fp->rate_max; 1124 if (runtime->hw.channels_min > fp->channels) 1125 runtime->hw.channels_min = fp->channels; 1126 if (runtime->hw.channels_max < fp->channels) 1127 runtime->hw.channels_max = fp->channels; 1128 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) { 1129 /* FIXME: there might be more than one audio formats... */ 1130 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max = 1131 fp->frame_size; 1132 } 1133 pt = 125 * (1 << fp->datainterval); 1134 ptmin = min(ptmin, pt); 1135 } 1136 err = snd_usb_autoresume(subs->stream->chip); 1137 if (err < 0) 1138 return err; 1139 1140 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME; 1141 if (subs->speed == USB_SPEED_FULL) 1142 /* full speed devices have fixed data packet interval */ 1143 ptmin = 1000; 1144 if (ptmin == 1000) 1145 /* if period time doesn't go below 1 ms, no rules needed */ 1146 param_period_time_if_needed = -1; 1147 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1148 ptmin, UINT_MAX); 1149 1150 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1151 hw_rule_rate, subs, 1152 SNDRV_PCM_HW_PARAM_FORMAT, 1153 SNDRV_PCM_HW_PARAM_CHANNELS, 1154 param_period_time_if_needed, 1155 -1)) < 0) 1156 goto rep_err; 1157 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 1158 hw_rule_channels, subs, 1159 SNDRV_PCM_HW_PARAM_FORMAT, 1160 SNDRV_PCM_HW_PARAM_RATE, 1161 param_period_time_if_needed, 1162 -1)) < 0) 1163 goto rep_err; 1164 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 1165 hw_rule_format, subs, 1166 SNDRV_PCM_HW_PARAM_RATE, 1167 SNDRV_PCM_HW_PARAM_CHANNELS, 1168 param_period_time_if_needed, 1169 -1)) < 0) 1170 goto rep_err; 1171 if (param_period_time_if_needed >= 0) { 1172 err = snd_pcm_hw_rule_add(runtime, 0, 1173 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1174 hw_rule_period_time, subs, 1175 SNDRV_PCM_HW_PARAM_FORMAT, 1176 SNDRV_PCM_HW_PARAM_CHANNELS, 1177 SNDRV_PCM_HW_PARAM_RATE, 1178 -1); 1179 if (err < 0) 1180 goto rep_err; 1181 } 1182 if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0) 1183 goto rep_err; 1184 return 0; 1185 1186rep_err: 1187 snd_usb_autosuspend(subs->stream->chip); 1188 return err; 1189} 1190 1191static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction) 1192{ 1193 struct snd_usb_stream *as = snd_pcm_substream_chip(substream); 1194 struct snd_pcm_runtime *runtime = substream->runtime; 1195 struct snd_usb_substream *subs = &as->substream[direction]; 1196 1197 subs->interface = -1; 1198 subs->altset_idx = 0; 1199 runtime->hw = snd_usb_hardware; 1200 runtime->private_data = subs; 1201 subs->pcm_substream = substream; 1202 /* runtime PM is also done there */ 1203 1204 /* initialize DSD/DOP context */ 1205 subs->dsd_dop.byte_idx = 0; 1206 subs->dsd_dop.channel = 0; 1207 subs->dsd_dop.marker = 1; 1208 1209 return setup_hw_info(runtime, subs); 1210} 1211 1212static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction) 1213{ 1214 struct snd_usb_stream *as = snd_pcm_substream_chip(substream); 1215 struct snd_usb_substream *subs = &as->substream[direction]; 1216 1217 stop_endpoints(subs, true); 1218 1219 if (subs->interface >= 0 && 1220 !snd_usb_lock_shutdown(subs->stream->chip)) { 1221 usb_set_interface(subs->dev, subs->interface, 0); 1222 subs->interface = -1; 1223 snd_usb_unlock_shutdown(subs->stream->chip); 1224 } 1225 1226 subs->pcm_substream = NULL; 1227 snd_usb_autosuspend(subs->stream->chip); 1228 1229 return 0; 1230} 1231 1232/* Since a URB can handle only a single linear buffer, we must use double 1233 * buffering when the data to be transferred overflows the buffer boundary. 1234 * To avoid inconsistencies when updating hwptr_done, we use double buffering 1235 * for all URBs. 1236 */ 1237static void retire_capture_urb(struct snd_usb_substream *subs, 1238 struct urb *urb) 1239{ 1240 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1241 unsigned int stride, frames, bytes, oldptr; 1242 int i, period_elapsed = 0; 1243 unsigned long flags; 1244 unsigned char *cp; 1245 int current_frame_number; 1246 1247 /* read frame number here, update pointer in critical section */ 1248 current_frame_number = usb_get_current_frame_number(subs->dev); 1249 1250 stride = runtime->frame_bits >> 3; 1251 1252 for (i = 0; i < urb->number_of_packets; i++) { 1253 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj; 1254 if (urb->iso_frame_desc[i].status && printk_ratelimit()) { 1255 dev_dbg(&subs->dev->dev, "frame %d active: %d\n", 1256 i, urb->iso_frame_desc[i].status); 1257 // continue; 1258 } 1259 bytes = urb->iso_frame_desc[i].actual_length; 1260 frames = bytes / stride; 1261 if (!subs->txfr_quirk) 1262 bytes = frames * stride; 1263 if (bytes % (runtime->sample_bits >> 3) != 0) { 1264 int oldbytes = bytes; 1265 bytes = frames * stride; 1266 dev_warn(&subs->dev->dev, 1267 "Corrected urb data len. %d->%d\n", 1268 oldbytes, bytes); 1269 } 1270 /* update the current pointer */ 1271 spin_lock_irqsave(&subs->lock, flags); 1272 oldptr = subs->hwptr_done; 1273 subs->hwptr_done += bytes; 1274 if (subs->hwptr_done >= runtime->buffer_size * stride) 1275 subs->hwptr_done -= runtime->buffer_size * stride; 1276 frames = (bytes + (oldptr % stride)) / stride; 1277 subs->transfer_done += frames; 1278 if (subs->transfer_done >= runtime->period_size) { 1279 subs->transfer_done -= runtime->period_size; 1280 period_elapsed = 1; 1281 } 1282 /* capture delay is by construction limited to one URB, 1283 * reset delays here 1284 */ 1285 runtime->delay = subs->last_delay = 0; 1286 1287 /* realign last_frame_number */ 1288 subs->last_frame_number = current_frame_number; 1289 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */ 1290 1291 spin_unlock_irqrestore(&subs->lock, flags); 1292 /* copy a data chunk */ 1293 if (oldptr + bytes > runtime->buffer_size * stride) { 1294 unsigned int bytes1 = 1295 runtime->buffer_size * stride - oldptr; 1296 memcpy(runtime->dma_area + oldptr, cp, bytes1); 1297 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1); 1298 } else { 1299 memcpy(runtime->dma_area + oldptr, cp, bytes); 1300 } 1301 } 1302 1303 if (period_elapsed) 1304 snd_pcm_period_elapsed(subs->pcm_substream); 1305} 1306 1307static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs, 1308 struct urb *urb, unsigned int bytes) 1309{ 1310 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1311 unsigned int stride = runtime->frame_bits >> 3; 1312 unsigned int dst_idx = 0; 1313 unsigned int src_idx = subs->hwptr_done; 1314 unsigned int wrap = runtime->buffer_size * stride; 1315 u8 *dst = urb->transfer_buffer; 1316 u8 *src = runtime->dma_area; 1317 u8 marker[] = { 0x05, 0xfa }; 1318 1319 /* 1320 * The DSP DOP format defines a way to transport DSD samples over 1321 * normal PCM data endpoints. It requires stuffing of marker bytes 1322 * (0x05 and 0xfa, alternating per sample frame), and then expects 1323 * 2 additional bytes of actual payload. The whole frame is stored 1324 * LSB. 1325 * 1326 * Hence, for a stereo transport, the buffer layout looks like this, 1327 * where L refers to left channel samples and R to right. 1328 * 1329 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa 1330 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa 1331 * ..... 1332 * 1333 */ 1334 1335 while (bytes--) { 1336 if (++subs->dsd_dop.byte_idx == 3) { 1337 /* frame boundary? */ 1338 dst[dst_idx++] = marker[subs->dsd_dop.marker]; 1339 src_idx += 2; 1340 subs->dsd_dop.byte_idx = 0; 1341 1342 if (++subs->dsd_dop.channel % runtime->channels == 0) { 1343 /* alternate the marker */ 1344 subs->dsd_dop.marker++; 1345 subs->dsd_dop.marker %= ARRAY_SIZE(marker); 1346 subs->dsd_dop.channel = 0; 1347 } 1348 } else { 1349 /* stuff the DSD payload */ 1350 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap; 1351 1352 if (subs->cur_audiofmt->dsd_bitrev) 1353 dst[dst_idx++] = bitrev8(src[idx]); 1354 else 1355 dst[dst_idx++] = src[idx]; 1356 1357 subs->hwptr_done++; 1358 } 1359 } 1360} 1361 1362static void prepare_playback_urb(struct snd_usb_substream *subs, 1363 struct urb *urb) 1364{ 1365 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1366 struct snd_usb_endpoint *ep = subs->data_endpoint; 1367 struct snd_urb_ctx *ctx = urb->context; 1368 unsigned int counts, frames, bytes; 1369 int i, stride, period_elapsed = 0; 1370 unsigned long flags; 1371 1372 stride = runtime->frame_bits >> 3; 1373 1374 frames = 0; 1375 urb->number_of_packets = 0; 1376 spin_lock_irqsave(&subs->lock, flags); 1377 subs->frame_limit += ep->max_urb_frames; 1378 for (i = 0; i < ctx->packets; i++) { 1379 if (ctx->packet_size[i]) 1380 counts = ctx->packet_size[i]; 1381 else 1382 counts = snd_usb_endpoint_next_packet_size(ep); 1383 1384 /* set up descriptor */ 1385 urb->iso_frame_desc[i].offset = frames * ep->stride; 1386 urb->iso_frame_desc[i].length = counts * ep->stride; 1387 frames += counts; 1388 urb->number_of_packets++; 1389 subs->transfer_done += counts; 1390 if (subs->transfer_done >= runtime->period_size) { 1391 subs->transfer_done -= runtime->period_size; 1392 subs->frame_limit = 0; 1393 period_elapsed = 1; 1394 if (subs->fmt_type == UAC_FORMAT_TYPE_II) { 1395 if (subs->transfer_done > 0) { 1396 /* FIXME: fill-max mode is not 1397 * supported yet */ 1398 frames -= subs->transfer_done; 1399 counts -= subs->transfer_done; 1400 urb->iso_frame_desc[i].length = 1401 counts * ep->stride; 1402 subs->transfer_done = 0; 1403 } 1404 i++; 1405 if (i < ctx->packets) { 1406 /* add a transfer delimiter */ 1407 urb->iso_frame_desc[i].offset = 1408 frames * ep->stride; 1409 urb->iso_frame_desc[i].length = 0; 1410 urb->number_of_packets++; 1411 } 1412 break; 1413 } 1414 } 1415 /* finish at the period boundary or after enough frames */ 1416 if ((period_elapsed || 1417 subs->transfer_done >= subs->frame_limit) && 1418 !snd_usb_endpoint_implicit_feedback_sink(ep)) 1419 break; 1420 } 1421 bytes = frames * ep->stride; 1422 1423 if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE && 1424 subs->cur_audiofmt->dsd_dop)) { 1425 fill_playback_urb_dsd_dop(subs, urb, bytes); 1426 } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 && 1427 subs->cur_audiofmt->dsd_bitrev)) { 1428 /* bit-reverse the bytes */ 1429 u8 *buf = urb->transfer_buffer; 1430 for (i = 0; i < bytes; i++) { 1431 int idx = (subs->hwptr_done + i) 1432 % (runtime->buffer_size * stride); 1433 buf[i] = bitrev8(runtime->dma_area[idx]); 1434 } 1435 1436 subs->hwptr_done += bytes; 1437 } else { 1438 /* usual PCM */ 1439 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) { 1440 /* err, the transferred area goes over buffer boundary. */ 1441 unsigned int bytes1 = 1442 runtime->buffer_size * stride - subs->hwptr_done; 1443 memcpy(urb->transfer_buffer, 1444 runtime->dma_area + subs->hwptr_done, bytes1); 1445 memcpy(urb->transfer_buffer + bytes1, 1446 runtime->dma_area, bytes - bytes1); 1447 } else { 1448 memcpy(urb->transfer_buffer, 1449 runtime->dma_area + subs->hwptr_done, bytes); 1450 } 1451 1452 subs->hwptr_done += bytes; 1453 } 1454 1455 if (subs->hwptr_done >= runtime->buffer_size * stride) 1456 subs->hwptr_done -= runtime->buffer_size * stride; 1457 1458 /* update delay with exact number of samples queued */ 1459 runtime->delay = subs->last_delay; 1460 runtime->delay += frames; 1461 subs->last_delay = runtime->delay; 1462 1463 /* realign last_frame_number */ 1464 subs->last_frame_number = usb_get_current_frame_number(subs->dev); 1465 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */ 1466 1467 if (subs->trigger_tstamp_pending_update) { 1468 /* this is the first actual URB submitted, 1469 * update trigger timestamp to reflect actual start time 1470 */ 1471 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 1472 subs->trigger_tstamp_pending_update = false; 1473 } 1474 1475 spin_unlock_irqrestore(&subs->lock, flags); 1476 urb->transfer_buffer_length = bytes; 1477 if (period_elapsed) 1478 snd_pcm_period_elapsed(subs->pcm_substream); 1479} 1480 1481/* 1482 * process after playback data complete 1483 * - decrease the delay count again 1484 */ 1485static void retire_playback_urb(struct snd_usb_substream *subs, 1486 struct urb *urb) 1487{ 1488 unsigned long flags; 1489 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1490 struct snd_usb_endpoint *ep = subs->data_endpoint; 1491 int processed = urb->transfer_buffer_length / ep->stride; 1492 int est_delay; 1493 1494 /* ignore the delay accounting when procssed=0 is given, i.e. 1495 * silent payloads are procssed before handling the actual data 1496 */ 1497 if (!processed) 1498 return; 1499 1500 spin_lock_irqsave(&subs->lock, flags); 1501 if (!subs->last_delay) 1502 goto out; /* short path */ 1503 1504 est_delay = snd_usb_pcm_delay(subs, runtime->rate); 1505 /* update delay with exact number of samples played */ 1506 if (processed > subs->last_delay) 1507 subs->last_delay = 0; 1508 else 1509 subs->last_delay -= processed; 1510 runtime->delay = subs->last_delay; 1511 1512 /* 1513 * Report when delay estimate is off by more than 2ms. 1514 * The error should be lower than 2ms since the estimate relies 1515 * on two reads of a counter updated every ms. 1516 */ 1517 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2) 1518 dev_dbg_ratelimited(&subs->dev->dev, 1519 "delay: estimated %d, actual %d\n", 1520 est_delay, subs->last_delay); 1521 1522 if (!subs->running) { 1523 /* update last_frame_number for delay counting here since 1524 * prepare_playback_urb won't be called during pause 1525 */ 1526 subs->last_frame_number = 1527 usb_get_current_frame_number(subs->dev) & 0xff; 1528 } 1529 1530 out: 1531 spin_unlock_irqrestore(&subs->lock, flags); 1532} 1533 1534static int snd_usb_playback_open(struct snd_pcm_substream *substream) 1535{ 1536 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK); 1537} 1538 1539static int snd_usb_playback_close(struct snd_pcm_substream *substream) 1540{ 1541 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK); 1542} 1543 1544static int snd_usb_capture_open(struct snd_pcm_substream *substream) 1545{ 1546 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE); 1547} 1548 1549static int snd_usb_capture_close(struct snd_pcm_substream *substream) 1550{ 1551 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE); 1552} 1553 1554static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream, 1555 int cmd) 1556{ 1557 struct snd_usb_substream *subs = substream->runtime->private_data; 1558 1559 switch (cmd) { 1560 case SNDRV_PCM_TRIGGER_START: 1561 subs->trigger_tstamp_pending_update = true; 1562 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 1563 subs->data_endpoint->prepare_data_urb = prepare_playback_urb; 1564 subs->data_endpoint->retire_data_urb = retire_playback_urb; 1565 subs->running = 1; 1566 return 0; 1567 case SNDRV_PCM_TRIGGER_STOP: 1568 stop_endpoints(subs, false); 1569 subs->running = 0; 1570 return 0; 1571 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 1572 subs->data_endpoint->prepare_data_urb = NULL; 1573 /* keep retire_data_urb for delay calculation */ 1574 subs->data_endpoint->retire_data_urb = retire_playback_urb; 1575 subs->running = 0; 1576 return 0; 1577 } 1578 1579 return -EINVAL; 1580} 1581 1582static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream, 1583 int cmd) 1584{ 1585 int err; 1586 struct snd_usb_substream *subs = substream->runtime->private_data; 1587 1588 switch (cmd) { 1589 case SNDRV_PCM_TRIGGER_START: 1590 err = start_endpoints(subs, false); 1591 if (err < 0) 1592 return err; 1593 1594 subs->data_endpoint->retire_data_urb = retire_capture_urb; 1595 subs->running = 1; 1596 return 0; 1597 case SNDRV_PCM_TRIGGER_STOP: 1598 stop_endpoints(subs, false); 1599 subs->running = 0; 1600 return 0; 1601 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 1602 subs->data_endpoint->retire_data_urb = NULL; 1603 subs->running = 0; 1604 return 0; 1605 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 1606 subs->data_endpoint->retire_data_urb = retire_capture_urb; 1607 subs->running = 1; 1608 return 0; 1609 } 1610 1611 return -EINVAL; 1612} 1613 1614static struct snd_pcm_ops snd_usb_playback_ops = { 1615 .open = snd_usb_playback_open, 1616 .close = snd_usb_playback_close, 1617 .ioctl = snd_pcm_lib_ioctl, 1618 .hw_params = snd_usb_hw_params, 1619 .hw_free = snd_usb_hw_free, 1620 .prepare = snd_usb_pcm_prepare, 1621 .trigger = snd_usb_substream_playback_trigger, 1622 .pointer = snd_usb_pcm_pointer, 1623 .page = snd_pcm_lib_get_vmalloc_page, 1624 .mmap = snd_pcm_lib_mmap_vmalloc, 1625}; 1626 1627static struct snd_pcm_ops snd_usb_capture_ops = { 1628 .open = snd_usb_capture_open, 1629 .close = snd_usb_capture_close, 1630 .ioctl = snd_pcm_lib_ioctl, 1631 .hw_params = snd_usb_hw_params, 1632 .hw_free = snd_usb_hw_free, 1633 .prepare = snd_usb_pcm_prepare, 1634 .trigger = snd_usb_substream_capture_trigger, 1635 .pointer = snd_usb_pcm_pointer, 1636 .page = snd_pcm_lib_get_vmalloc_page, 1637 .mmap = snd_pcm_lib_mmap_vmalloc, 1638}; 1639 1640void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream) 1641{ 1642 snd_pcm_set_ops(pcm, stream, 1643 stream == SNDRV_PCM_STREAM_PLAYBACK ? 1644 &snd_usb_playback_ops : &snd_usb_capture_ops); 1645} 1646