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 */ 43 snd_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 */ 77 static 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 */ 96 static 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 } 152 153 static 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 ep = get_endpoint(alts, 0)->bEndpointAddress; 163 164 data[0] = 1; 165 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR, 166 USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT, 167 UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep, 168 data, sizeof(data))) < 0) { 169 usb_audio_err(chip, "%d:%d: cannot set enable PITCH\n", 170 iface, ep); 171 return err; 172 } 173 174 return 0; 175 } 176 177 static int init_pitch_v2(struct snd_usb_audio *chip, int iface, 178 struct usb_host_interface *alts, 179 struct audioformat *fmt) 180 { 181 struct usb_device *dev = chip->dev; 182 unsigned char data[1]; 183 int err; 184 185 data[0] = 1; 186 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR, 187 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT, 188 UAC2_EP_CS_PITCH << 8, 0, 189 data, sizeof(data))) < 0) { 190 usb_audio_err(chip, "%d:%d: cannot set enable PITCH (v2)\n", 191 iface, fmt->altsetting); 192 return err; 193 } 194 195 return 0; 196 } 197 198 /* 199 * initialize the pitch control and sample rate 200 */ 201 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface, 202 struct usb_host_interface *alts, 203 struct audioformat *fmt) 204 { 205 /* if endpoint doesn't have pitch control, bail out */ 206 if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL)) 207 return 0; 208 209 switch (fmt->protocol) { 210 case UAC_VERSION_1: 211 default: 212 return init_pitch_v1(chip, iface, alts, fmt); 213 214 case UAC_VERSION_2: 215 return init_pitch_v2(chip, iface, alts, fmt); 216 } 217 } 218 219 static int start_endpoints(struct snd_usb_substream *subs, bool can_sleep) 220 { 221 int err; 222 223 if (!subs->data_endpoint) 224 return -EINVAL; 225 226 if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) { 227 struct snd_usb_endpoint *ep = subs->data_endpoint; 228 229 dev_dbg(&subs->dev->dev, "Starting data EP @%p\n", ep); 230 231 ep->data_subs = subs; 232 err = snd_usb_endpoint_start(ep, can_sleep); 233 if (err < 0) { 234 clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags); 235 return err; 236 } 237 } 238 239 if (subs->sync_endpoint && 240 !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) { 241 struct snd_usb_endpoint *ep = subs->sync_endpoint; 242 243 if (subs->data_endpoint->iface != subs->sync_endpoint->iface || 244 subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) { 245 err = usb_set_interface(subs->dev, 246 subs->sync_endpoint->iface, 247 subs->sync_endpoint->altsetting); 248 if (err < 0) { 249 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags); 250 dev_err(&subs->dev->dev, 251 "%d:%d: cannot set interface (%d)\n", 252 subs->sync_endpoint->iface, 253 subs->sync_endpoint->altsetting, err); 254 return -EIO; 255 } 256 } 257 258 dev_dbg(&subs->dev->dev, "Starting sync EP @%p\n", ep); 259 260 ep->sync_slave = subs->data_endpoint; 261 err = snd_usb_endpoint_start(ep, can_sleep); 262 if (err < 0) { 263 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags); 264 return err; 265 } 266 } 267 268 return 0; 269 } 270 271 static void stop_endpoints(struct snd_usb_substream *subs, bool wait) 272 { 273 if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) 274 snd_usb_endpoint_stop(subs->sync_endpoint); 275 276 if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) 277 snd_usb_endpoint_stop(subs->data_endpoint); 278 279 if (wait) { 280 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint); 281 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint); 282 } 283 } 284 285 static int search_roland_implicit_fb(struct usb_device *dev, int ifnum, 286 unsigned int altsetting, 287 struct usb_host_interface **alts, 288 unsigned int *ep) 289 { 290 struct usb_interface *iface; 291 struct usb_interface_descriptor *altsd; 292 struct usb_endpoint_descriptor *epd; 293 294 iface = usb_ifnum_to_if(dev, ifnum); 295 if (!iface || iface->num_altsetting < altsetting + 1) 296 return -ENOENT; 297 *alts = &iface->altsetting[altsetting]; 298 altsd = get_iface_desc(*alts); 299 if (altsd->bAlternateSetting != altsetting || 300 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC || 301 (altsd->bInterfaceSubClass != 2 && 302 altsd->bInterfaceProtocol != 2 ) || 303 altsd->bNumEndpoints < 1) 304 return -ENOENT; 305 epd = get_endpoint(*alts, 0); 306 if (!usb_endpoint_is_isoc_in(epd) || 307 (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) != 308 USB_ENDPOINT_USAGE_IMPLICIT_FB) 309 return -ENOENT; 310 *ep = epd->bEndpointAddress; 311 return 0; 312 } 313 314 static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs, 315 struct usb_device *dev, 316 struct usb_interface_descriptor *altsd, 317 unsigned int attr) 318 { 319 struct usb_host_interface *alts; 320 struct usb_interface *iface; 321 unsigned int ep; 322 323 /* Implicit feedback sync EPs consumers are always playback EPs */ 324 if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK) 325 return 0; 326 327 switch (subs->stream->chip->usb_id) { 328 case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */ 329 case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */ 330 ep = 0x81; 331 iface = usb_ifnum_to_if(dev, 3); 332 333 if (!iface || iface->num_altsetting == 0) 334 return -EINVAL; 335 336 alts = &iface->altsetting[1]; 337 goto add_sync_ep; 338 break; 339 case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */ 340 case USB_ID(0x0763, 0x2081): 341 ep = 0x81; 342 iface = usb_ifnum_to_if(dev, 2); 343 344 if (!iface || iface->num_altsetting == 0) 345 return -EINVAL; 346 347 alts = &iface->altsetting[1]; 348 goto add_sync_ep; 349 } 350 if (attr == USB_ENDPOINT_SYNC_ASYNC && 351 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC && 352 altsd->bInterfaceProtocol == 2 && 353 altsd->bNumEndpoints == 1 && 354 USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ && 355 search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1, 356 altsd->bAlternateSetting, 357 &alts, &ep) >= 0) { 358 goto add_sync_ep; 359 } 360 361 /* No quirk */ 362 return 0; 363 364 add_sync_ep: 365 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip, 366 alts, ep, !subs->direction, 367 SND_USB_ENDPOINT_TYPE_DATA); 368 if (!subs->sync_endpoint) 369 return -EINVAL; 370 371 subs->data_endpoint->sync_master = subs->sync_endpoint; 372 373 return 0; 374 } 375 376 static int set_sync_endpoint(struct snd_usb_substream *subs, 377 struct audioformat *fmt, 378 struct usb_device *dev, 379 struct usb_host_interface *alts, 380 struct usb_interface_descriptor *altsd) 381 { 382 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK; 383 unsigned int ep, attr; 384 bool implicit_fb; 385 int err; 386 387 /* we need a sync pipe in async OUT or adaptive IN mode */ 388 /* check the number of EP, since some devices have broken 389 * descriptors which fool us. if it has only one EP, 390 * assume it as adaptive-out or sync-in. 391 */ 392 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE; 393 394 if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) || 395 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) { 396 397 /* 398 * In these modes the notion of sync_endpoint is irrelevant. 399 * Reset pointers to avoid using stale data from previously 400 * used settings, e.g. when configuration and endpoints were 401 * changed 402 */ 403 404 subs->sync_endpoint = NULL; 405 subs->data_endpoint->sync_master = NULL; 406 } 407 408 err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr); 409 if (err < 0) 410 return err; 411 412 if (altsd->bNumEndpoints < 2) 413 return 0; 414 415 if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC || 416 attr == USB_ENDPOINT_SYNC_ADAPTIVE)) || 417 (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE)) 418 return 0; 419 420 /* 421 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see 422 * if we don't find a sync endpoint, as on M-Audio Transit. In case of 423 * error fall back to SYNC mode and don't create sync endpoint 424 */ 425 426 /* check sync-pipe endpoint */ 427 /* ... and check descriptor size before accessing bSynchAddress 428 because there is a version of the SB Audigy 2 NX firmware lacking 429 the audio fields in the endpoint descriptors */ 430 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC || 431 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE && 432 get_endpoint(alts, 1)->bSynchAddress != 0)) { 433 dev_err(&dev->dev, 434 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n", 435 fmt->iface, fmt->altsetting, 436 get_endpoint(alts, 1)->bmAttributes, 437 get_endpoint(alts, 1)->bLength, 438 get_endpoint(alts, 1)->bSynchAddress); 439 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE) 440 return 0; 441 return -EINVAL; 442 } 443 ep = get_endpoint(alts, 1)->bEndpointAddress; 444 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE && 445 ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) || 446 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) { 447 dev_err(&dev->dev, 448 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n", 449 fmt->iface, fmt->altsetting, 450 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress); 451 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE) 452 return 0; 453 return -EINVAL; 454 } 455 456 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK) 457 == USB_ENDPOINT_USAGE_IMPLICIT_FB; 458 459 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip, 460 alts, ep, !subs->direction, 461 implicit_fb ? 462 SND_USB_ENDPOINT_TYPE_DATA : 463 SND_USB_ENDPOINT_TYPE_SYNC); 464 if (!subs->sync_endpoint) { 465 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE) 466 return 0; 467 return -EINVAL; 468 } 469 470 subs->data_endpoint->sync_master = subs->sync_endpoint; 471 472 return 0; 473 } 474 475 /* 476 * find a matching format and set up the interface 477 */ 478 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt) 479 { 480 struct usb_device *dev = subs->dev; 481 struct usb_host_interface *alts; 482 struct usb_interface_descriptor *altsd; 483 struct usb_interface *iface; 484 int err; 485 486 iface = usb_ifnum_to_if(dev, fmt->iface); 487 if (WARN_ON(!iface)) 488 return -EINVAL; 489 alts = &iface->altsetting[fmt->altset_idx]; 490 altsd = get_iface_desc(alts); 491 if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting)) 492 return -EINVAL; 493 494 if (fmt == subs->cur_audiofmt) 495 return 0; 496 497 /* close the old interface */ 498 if (subs->interface >= 0 && subs->interface != fmt->iface) { 499 err = usb_set_interface(subs->dev, subs->interface, 0); 500 if (err < 0) { 501 dev_err(&dev->dev, 502 "%d:%d: return to setting 0 failed (%d)\n", 503 fmt->iface, fmt->altsetting, err); 504 return -EIO; 505 } 506 subs->interface = -1; 507 subs->altset_idx = 0; 508 } 509 510 /* set interface */ 511 if (subs->interface != fmt->iface || 512 subs->altset_idx != fmt->altset_idx) { 513 514 err = snd_usb_select_mode_quirk(subs, fmt); 515 if (err < 0) 516 return -EIO; 517 518 err = usb_set_interface(dev, fmt->iface, fmt->altsetting); 519 if (err < 0) { 520 dev_err(&dev->dev, 521 "%d:%d: usb_set_interface failed (%d)\n", 522 fmt->iface, fmt->altsetting, err); 523 return -EIO; 524 } 525 dev_dbg(&dev->dev, "setting usb interface %d:%d\n", 526 fmt->iface, fmt->altsetting); 527 subs->interface = fmt->iface; 528 subs->altset_idx = fmt->altset_idx; 529 530 snd_usb_set_interface_quirk(dev); 531 } 532 533 subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip, 534 alts, fmt->endpoint, subs->direction, 535 SND_USB_ENDPOINT_TYPE_DATA); 536 537 if (!subs->data_endpoint) 538 return -EINVAL; 539 540 err = set_sync_endpoint(subs, fmt, dev, alts, altsd); 541 if (err < 0) 542 return err; 543 544 err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt); 545 if (err < 0) 546 return err; 547 548 subs->cur_audiofmt = fmt; 549 550 snd_usb_set_format_quirk(subs, fmt); 551 552 return 0; 553 } 554 555 /* 556 * Return the score of matching two audioformats. 557 * Veto the audioformat if: 558 * - It has no channels for some reason. 559 * - Requested PCM format is not supported. 560 * - Requested sample rate is not supported. 561 */ 562 static int match_endpoint_audioformats(struct snd_usb_substream *subs, 563 struct audioformat *fp, 564 struct audioformat *match, int rate, 565 snd_pcm_format_t pcm_format) 566 { 567 int i; 568 int score = 0; 569 570 if (fp->channels < 1) { 571 dev_dbg(&subs->dev->dev, 572 "%s: (fmt @%p) no channels\n", __func__, fp); 573 return 0; 574 } 575 576 if (!(fp->formats & pcm_format_to_bits(pcm_format))) { 577 dev_dbg(&subs->dev->dev, 578 "%s: (fmt @%p) no match for format %d\n", __func__, 579 fp, pcm_format); 580 return 0; 581 } 582 583 for (i = 0; i < fp->nr_rates; i++) { 584 if (fp->rate_table[i] == rate) { 585 score++; 586 break; 587 } 588 } 589 if (!score) { 590 dev_dbg(&subs->dev->dev, 591 "%s: (fmt @%p) no match for rate %d\n", __func__, 592 fp, rate); 593 return 0; 594 } 595 596 if (fp->channels == match->channels) 597 score++; 598 599 dev_dbg(&subs->dev->dev, 600 "%s: (fmt @%p) score %d\n", __func__, fp, score); 601 602 return score; 603 } 604 605 /* 606 * Configure the sync ep using the rate and pcm format of the data ep. 607 */ 608 static int configure_sync_endpoint(struct snd_usb_substream *subs) 609 { 610 int ret; 611 struct audioformat *fp; 612 struct audioformat *sync_fp = NULL; 613 int cur_score = 0; 614 int sync_period_bytes = subs->period_bytes; 615 struct snd_usb_substream *sync_subs = 616 &subs->stream->substream[subs->direction ^ 1]; 617 618 if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA || 619 !subs->stream) 620 return snd_usb_endpoint_set_params(subs->sync_endpoint, 621 subs->pcm_format, 622 subs->channels, 623 subs->period_bytes, 624 0, 0, 625 subs->cur_rate, 626 subs->cur_audiofmt, 627 NULL); 628 629 /* Try to find the best matching audioformat. */ 630 list_for_each_entry(fp, &sync_subs->fmt_list, list) { 631 int score = match_endpoint_audioformats(subs, 632 fp, subs->cur_audiofmt, 633 subs->cur_rate, subs->pcm_format); 634 635 if (score > cur_score) { 636 sync_fp = fp; 637 cur_score = score; 638 } 639 } 640 641 if (unlikely(sync_fp == NULL)) { 642 dev_err(&subs->dev->dev, 643 "%s: no valid audioformat for sync ep %x found\n", 644 __func__, sync_subs->ep_num); 645 return -EINVAL; 646 } 647 648 /* 649 * Recalculate the period bytes if channel number differ between 650 * data and sync ep audioformat. 651 */ 652 if (sync_fp->channels != subs->channels) { 653 sync_period_bytes = (subs->period_bytes / subs->channels) * 654 sync_fp->channels; 655 dev_dbg(&subs->dev->dev, 656 "%s: adjusted sync ep period bytes (%d -> %d)\n", 657 __func__, subs->period_bytes, sync_period_bytes); 658 } 659 660 ret = snd_usb_endpoint_set_params(subs->sync_endpoint, 661 subs->pcm_format, 662 sync_fp->channels, 663 sync_period_bytes, 664 0, 0, 665 subs->cur_rate, 666 sync_fp, 667 NULL); 668 669 return ret; 670 } 671 672 /* 673 * configure endpoint params 674 * 675 * called during initial setup and upon resume 676 */ 677 static int configure_endpoint(struct snd_usb_substream *subs) 678 { 679 int ret; 680 681 /* format changed */ 682 stop_endpoints(subs, true); 683 ret = snd_usb_endpoint_set_params(subs->data_endpoint, 684 subs->pcm_format, 685 subs->channels, 686 subs->period_bytes, 687 subs->period_frames, 688 subs->buffer_periods, 689 subs->cur_rate, 690 subs->cur_audiofmt, 691 subs->sync_endpoint); 692 if (ret < 0) 693 return ret; 694 695 if (subs->sync_endpoint) 696 ret = configure_sync_endpoint(subs); 697 698 return ret; 699 } 700 701 /* 702 * hw_params callback 703 * 704 * allocate a buffer and set the given audio format. 705 * 706 * so far we use a physically linear buffer although packetize transfer 707 * doesn't need a continuous area. 708 * if sg buffer is supported on the later version of alsa, we'll follow 709 * that. 710 */ 711 static int snd_usb_hw_params(struct snd_pcm_substream *substream, 712 struct snd_pcm_hw_params *hw_params) 713 { 714 struct snd_usb_substream *subs = substream->runtime->private_data; 715 struct audioformat *fmt; 716 int ret; 717 718 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream, 719 params_buffer_bytes(hw_params)); 720 if (ret < 0) 721 return ret; 722 723 subs->pcm_format = params_format(hw_params); 724 subs->period_bytes = params_period_bytes(hw_params); 725 subs->period_frames = params_period_size(hw_params); 726 subs->buffer_periods = params_periods(hw_params); 727 subs->channels = params_channels(hw_params); 728 subs->cur_rate = params_rate(hw_params); 729 730 fmt = find_format(subs); 731 if (!fmt) { 732 dev_dbg(&subs->dev->dev, 733 "cannot set format: format = %#x, rate = %d, channels = %d\n", 734 subs->pcm_format, subs->cur_rate, subs->channels); 735 return -EINVAL; 736 } 737 738 ret = snd_usb_lock_shutdown(subs->stream->chip); 739 if (ret < 0) 740 return ret; 741 ret = set_format(subs, fmt); 742 snd_usb_unlock_shutdown(subs->stream->chip); 743 if (ret < 0) 744 return ret; 745 746 subs->interface = fmt->iface; 747 subs->altset_idx = fmt->altset_idx; 748 subs->need_setup_ep = true; 749 750 return 0; 751 } 752 753 /* 754 * hw_free callback 755 * 756 * reset the audio format and release the buffer 757 */ 758 static int snd_usb_hw_free(struct snd_pcm_substream *substream) 759 { 760 struct snd_usb_substream *subs = substream->runtime->private_data; 761 762 subs->cur_audiofmt = NULL; 763 subs->cur_rate = 0; 764 subs->period_bytes = 0; 765 if (!snd_usb_lock_shutdown(subs->stream->chip)) { 766 stop_endpoints(subs, true); 767 snd_usb_endpoint_deactivate(subs->sync_endpoint); 768 snd_usb_endpoint_deactivate(subs->data_endpoint); 769 snd_usb_unlock_shutdown(subs->stream->chip); 770 } 771 return snd_pcm_lib_free_vmalloc_buffer(substream); 772 } 773 774 /* 775 * prepare callback 776 * 777 * only a few subtle things... 778 */ 779 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream) 780 { 781 struct snd_pcm_runtime *runtime = substream->runtime; 782 struct snd_usb_substream *subs = runtime->private_data; 783 struct usb_host_interface *alts; 784 struct usb_interface *iface; 785 int ret; 786 787 if (! subs->cur_audiofmt) { 788 dev_err(&subs->dev->dev, "no format is specified!\n"); 789 return -ENXIO; 790 } 791 792 ret = snd_usb_lock_shutdown(subs->stream->chip); 793 if (ret < 0) 794 return ret; 795 if (snd_BUG_ON(!subs->data_endpoint)) { 796 ret = -EIO; 797 goto unlock; 798 } 799 800 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint); 801 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint); 802 803 ret = set_format(subs, subs->cur_audiofmt); 804 if (ret < 0) 805 goto unlock; 806 807 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface); 808 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx]; 809 ret = snd_usb_init_sample_rate(subs->stream->chip, 810 subs->cur_audiofmt->iface, 811 alts, 812 subs->cur_audiofmt, 813 subs->cur_rate); 814 if (ret < 0) 815 goto unlock; 816 817 if (subs->need_setup_ep) { 818 ret = configure_endpoint(subs); 819 if (ret < 0) 820 goto unlock; 821 subs->need_setup_ep = false; 822 } 823 824 /* some unit conversions in runtime */ 825 subs->data_endpoint->maxframesize = 826 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize); 827 subs->data_endpoint->curframesize = 828 bytes_to_frames(runtime, subs->data_endpoint->curpacksize); 829 830 /* reset the pointer */ 831 subs->hwptr_done = 0; 832 subs->transfer_done = 0; 833 subs->last_delay = 0; 834 subs->last_frame_number = 0; 835 runtime->delay = 0; 836 837 /* for playback, submit the URBs now; otherwise, the first hwptr_done 838 * updates for all URBs would happen at the same time when starting */ 839 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) 840 ret = start_endpoints(subs, true); 841 842 unlock: 843 snd_usb_unlock_shutdown(subs->stream->chip); 844 return ret; 845 } 846 847 static struct snd_pcm_hardware snd_usb_hardware = 848 { 849 .info = SNDRV_PCM_INFO_MMAP | 850 SNDRV_PCM_INFO_MMAP_VALID | 851 SNDRV_PCM_INFO_BATCH | 852 SNDRV_PCM_INFO_INTERLEAVED | 853 SNDRV_PCM_INFO_BLOCK_TRANSFER | 854 SNDRV_PCM_INFO_PAUSE, 855 .buffer_bytes_max = 1024 * 1024, 856 .period_bytes_min = 64, 857 .period_bytes_max = 512 * 1024, 858 .periods_min = 2, 859 .periods_max = 1024, 860 }; 861 862 static int hw_check_valid_format(struct snd_usb_substream *subs, 863 struct snd_pcm_hw_params *params, 864 struct audioformat *fp) 865 { 866 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 867 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 868 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 869 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME); 870 struct snd_mask check_fmts; 871 unsigned int ptime; 872 873 /* check the format */ 874 snd_mask_none(&check_fmts); 875 check_fmts.bits[0] = (u32)fp->formats; 876 check_fmts.bits[1] = (u32)(fp->formats >> 32); 877 snd_mask_intersect(&check_fmts, fmts); 878 if (snd_mask_empty(&check_fmts)) { 879 hwc_debug(" > check: no supported format %d\n", fp->format); 880 return 0; 881 } 882 /* check the channels */ 883 if (fp->channels < ct->min || fp->channels > ct->max) { 884 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max); 885 return 0; 886 } 887 /* check the rate is within the range */ 888 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) { 889 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max); 890 return 0; 891 } 892 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) { 893 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min); 894 return 0; 895 } 896 /* check whether the period time is >= the data packet interval */ 897 if (subs->speed != USB_SPEED_FULL) { 898 ptime = 125 * (1 << fp->datainterval); 899 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) { 900 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max); 901 return 0; 902 } 903 } 904 return 1; 905 } 906 907 static int hw_rule_rate(struct snd_pcm_hw_params *params, 908 struct snd_pcm_hw_rule *rule) 909 { 910 struct snd_usb_substream *subs = rule->private; 911 struct audioformat *fp; 912 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 913 unsigned int rmin, rmax; 914 int changed; 915 916 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max); 917 changed = 0; 918 rmin = rmax = 0; 919 list_for_each_entry(fp, &subs->fmt_list, list) { 920 if (!hw_check_valid_format(subs, params, fp)) 921 continue; 922 if (changed++) { 923 if (rmin > fp->rate_min) 924 rmin = fp->rate_min; 925 if (rmax < fp->rate_max) 926 rmax = fp->rate_max; 927 } else { 928 rmin = fp->rate_min; 929 rmax = fp->rate_max; 930 } 931 } 932 933 if (!changed) { 934 hwc_debug(" --> get empty\n"); 935 it->empty = 1; 936 return -EINVAL; 937 } 938 939 changed = 0; 940 if (it->min < rmin) { 941 it->min = rmin; 942 it->openmin = 0; 943 changed = 1; 944 } 945 if (it->max > rmax) { 946 it->max = rmax; 947 it->openmax = 0; 948 changed = 1; 949 } 950 if (snd_interval_checkempty(it)) { 951 it->empty = 1; 952 return -EINVAL; 953 } 954 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed); 955 return changed; 956 } 957 958 959 static int hw_rule_channels(struct snd_pcm_hw_params *params, 960 struct snd_pcm_hw_rule *rule) 961 { 962 struct snd_usb_substream *subs = rule->private; 963 struct audioformat *fp; 964 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 965 unsigned int rmin, rmax; 966 int changed; 967 968 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max); 969 changed = 0; 970 rmin = rmax = 0; 971 list_for_each_entry(fp, &subs->fmt_list, list) { 972 if (!hw_check_valid_format(subs, params, fp)) 973 continue; 974 if (changed++) { 975 if (rmin > fp->channels) 976 rmin = fp->channels; 977 if (rmax < fp->channels) 978 rmax = fp->channels; 979 } else { 980 rmin = fp->channels; 981 rmax = fp->channels; 982 } 983 } 984 985 if (!changed) { 986 hwc_debug(" --> get empty\n"); 987 it->empty = 1; 988 return -EINVAL; 989 } 990 991 changed = 0; 992 if (it->min < rmin) { 993 it->min = rmin; 994 it->openmin = 0; 995 changed = 1; 996 } 997 if (it->max > rmax) { 998 it->max = rmax; 999 it->openmax = 0; 1000 changed = 1; 1001 } 1002 if (snd_interval_checkempty(it)) { 1003 it->empty = 1; 1004 return -EINVAL; 1005 } 1006 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed); 1007 return changed; 1008 } 1009 1010 static int hw_rule_format(struct snd_pcm_hw_params *params, 1011 struct snd_pcm_hw_rule *rule) 1012 { 1013 struct snd_usb_substream *subs = rule->private; 1014 struct audioformat *fp; 1015 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 1016 u64 fbits; 1017 u32 oldbits[2]; 1018 int changed; 1019 1020 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]); 1021 fbits = 0; 1022 list_for_each_entry(fp, &subs->fmt_list, list) { 1023 if (!hw_check_valid_format(subs, params, fp)) 1024 continue; 1025 fbits |= fp->formats; 1026 } 1027 1028 oldbits[0] = fmt->bits[0]; 1029 oldbits[1] = fmt->bits[1]; 1030 fmt->bits[0] &= (u32)fbits; 1031 fmt->bits[1] &= (u32)(fbits >> 32); 1032 if (!fmt->bits[0] && !fmt->bits[1]) { 1033 hwc_debug(" --> get empty\n"); 1034 return -EINVAL; 1035 } 1036 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]); 1037 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed); 1038 return changed; 1039 } 1040 1041 static int hw_rule_period_time(struct snd_pcm_hw_params *params, 1042 struct snd_pcm_hw_rule *rule) 1043 { 1044 struct snd_usb_substream *subs = rule->private; 1045 struct audioformat *fp; 1046 struct snd_interval *it; 1047 unsigned char min_datainterval; 1048 unsigned int pmin; 1049 int changed; 1050 1051 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME); 1052 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max); 1053 min_datainterval = 0xff; 1054 list_for_each_entry(fp, &subs->fmt_list, list) { 1055 if (!hw_check_valid_format(subs, params, fp)) 1056 continue; 1057 min_datainterval = min(min_datainterval, fp->datainterval); 1058 } 1059 if (min_datainterval == 0xff) { 1060 hwc_debug(" --> get empty\n"); 1061 it->empty = 1; 1062 return -EINVAL; 1063 } 1064 pmin = 125 * (1 << min_datainterval); 1065 changed = 0; 1066 if (it->min < pmin) { 1067 it->min = pmin; 1068 it->openmin = 0; 1069 changed = 1; 1070 } 1071 if (snd_interval_checkempty(it)) { 1072 it->empty = 1; 1073 return -EINVAL; 1074 } 1075 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed); 1076 return changed; 1077 } 1078 1079 /* 1080 * If the device supports unusual bit rates, does the request meet these? 1081 */ 1082 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime, 1083 struct snd_usb_substream *subs) 1084 { 1085 struct audioformat *fp; 1086 int *rate_list; 1087 int count = 0, needs_knot = 0; 1088 int err; 1089 1090 kfree(subs->rate_list.list); 1091 subs->rate_list.list = NULL; 1092 1093 list_for_each_entry(fp, &subs->fmt_list, list) { 1094 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS) 1095 return 0; 1096 count += fp->nr_rates; 1097 if (fp->rates & SNDRV_PCM_RATE_KNOT) 1098 needs_knot = 1; 1099 } 1100 if (!needs_knot) 1101 return 0; 1102 1103 subs->rate_list.list = rate_list = 1104 kmalloc(sizeof(int) * count, GFP_KERNEL); 1105 if (!subs->rate_list.list) 1106 return -ENOMEM; 1107 subs->rate_list.count = count; 1108 subs->rate_list.mask = 0; 1109 count = 0; 1110 list_for_each_entry(fp, &subs->fmt_list, list) { 1111 int i; 1112 for (i = 0; i < fp->nr_rates; i++) 1113 rate_list[count++] = fp->rate_table[i]; 1114 } 1115 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1116 &subs->rate_list); 1117 if (err < 0) 1118 return err; 1119 1120 return 0; 1121 } 1122 1123 1124 /* 1125 * set up the runtime hardware information. 1126 */ 1127 1128 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs) 1129 { 1130 struct audioformat *fp; 1131 unsigned int pt, ptmin; 1132 int param_period_time_if_needed; 1133 int err; 1134 1135 runtime->hw.formats = subs->formats; 1136 1137 runtime->hw.rate_min = 0x7fffffff; 1138 runtime->hw.rate_max = 0; 1139 runtime->hw.channels_min = 256; 1140 runtime->hw.channels_max = 0; 1141 runtime->hw.rates = 0; 1142 ptmin = UINT_MAX; 1143 /* check min/max rates and channels */ 1144 list_for_each_entry(fp, &subs->fmt_list, list) { 1145 runtime->hw.rates |= fp->rates; 1146 if (runtime->hw.rate_min > fp->rate_min) 1147 runtime->hw.rate_min = fp->rate_min; 1148 if (runtime->hw.rate_max < fp->rate_max) 1149 runtime->hw.rate_max = fp->rate_max; 1150 if (runtime->hw.channels_min > fp->channels) 1151 runtime->hw.channels_min = fp->channels; 1152 if (runtime->hw.channels_max < fp->channels) 1153 runtime->hw.channels_max = fp->channels; 1154 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) { 1155 /* FIXME: there might be more than one audio formats... */ 1156 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max = 1157 fp->frame_size; 1158 } 1159 pt = 125 * (1 << fp->datainterval); 1160 ptmin = min(ptmin, pt); 1161 } 1162 err = snd_usb_autoresume(subs->stream->chip); 1163 if (err < 0) 1164 return err; 1165 1166 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME; 1167 if (subs->speed == USB_SPEED_FULL) 1168 /* full speed devices have fixed data packet interval */ 1169 ptmin = 1000; 1170 if (ptmin == 1000) 1171 /* if period time doesn't go below 1 ms, no rules needed */ 1172 param_period_time_if_needed = -1; 1173 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1174 ptmin, UINT_MAX); 1175 1176 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1177 hw_rule_rate, subs, 1178 SNDRV_PCM_HW_PARAM_FORMAT, 1179 SNDRV_PCM_HW_PARAM_CHANNELS, 1180 param_period_time_if_needed, 1181 -1)) < 0) 1182 goto rep_err; 1183 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 1184 hw_rule_channels, subs, 1185 SNDRV_PCM_HW_PARAM_FORMAT, 1186 SNDRV_PCM_HW_PARAM_RATE, 1187 param_period_time_if_needed, 1188 -1)) < 0) 1189 goto rep_err; 1190 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 1191 hw_rule_format, subs, 1192 SNDRV_PCM_HW_PARAM_RATE, 1193 SNDRV_PCM_HW_PARAM_CHANNELS, 1194 param_period_time_if_needed, 1195 -1)) < 0) 1196 goto rep_err; 1197 if (param_period_time_if_needed >= 0) { 1198 err = snd_pcm_hw_rule_add(runtime, 0, 1199 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1200 hw_rule_period_time, subs, 1201 SNDRV_PCM_HW_PARAM_FORMAT, 1202 SNDRV_PCM_HW_PARAM_CHANNELS, 1203 SNDRV_PCM_HW_PARAM_RATE, 1204 -1); 1205 if (err < 0) 1206 goto rep_err; 1207 } 1208 if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0) 1209 goto rep_err; 1210 return 0; 1211 1212 rep_err: 1213 snd_usb_autosuspend(subs->stream->chip); 1214 return err; 1215 } 1216 1217 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction) 1218 { 1219 struct snd_usb_stream *as = snd_pcm_substream_chip(substream); 1220 struct snd_pcm_runtime *runtime = substream->runtime; 1221 struct snd_usb_substream *subs = &as->substream[direction]; 1222 1223 subs->interface = -1; 1224 subs->altset_idx = 0; 1225 runtime->hw = snd_usb_hardware; 1226 runtime->private_data = subs; 1227 subs->pcm_substream = substream; 1228 /* runtime PM is also done there */ 1229 1230 /* initialize DSD/DOP context */ 1231 subs->dsd_dop.byte_idx = 0; 1232 subs->dsd_dop.channel = 0; 1233 subs->dsd_dop.marker = 1; 1234 1235 return setup_hw_info(runtime, subs); 1236 } 1237 1238 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction) 1239 { 1240 struct snd_usb_stream *as = snd_pcm_substream_chip(substream); 1241 struct snd_usb_substream *subs = &as->substream[direction]; 1242 1243 stop_endpoints(subs, true); 1244 1245 if (subs->interface >= 0 && 1246 !snd_usb_lock_shutdown(subs->stream->chip)) { 1247 usb_set_interface(subs->dev, subs->interface, 0); 1248 subs->interface = -1; 1249 snd_usb_unlock_shutdown(subs->stream->chip); 1250 } 1251 1252 subs->pcm_substream = NULL; 1253 snd_usb_autosuspend(subs->stream->chip); 1254 1255 return 0; 1256 } 1257 1258 /* Since a URB can handle only a single linear buffer, we must use double 1259 * buffering when the data to be transferred overflows the buffer boundary. 1260 * To avoid inconsistencies when updating hwptr_done, we use double buffering 1261 * for all URBs. 1262 */ 1263 static void retire_capture_urb(struct snd_usb_substream *subs, 1264 struct urb *urb) 1265 { 1266 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1267 unsigned int stride, frames, bytes, oldptr; 1268 int i, period_elapsed = 0; 1269 unsigned long flags; 1270 unsigned char *cp; 1271 int current_frame_number; 1272 1273 /* read frame number here, update pointer in critical section */ 1274 current_frame_number = usb_get_current_frame_number(subs->dev); 1275 1276 stride = runtime->frame_bits >> 3; 1277 1278 for (i = 0; i < urb->number_of_packets; i++) { 1279 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj; 1280 if (urb->iso_frame_desc[i].status && printk_ratelimit()) { 1281 dev_dbg(&subs->dev->dev, "frame %d active: %d\n", 1282 i, urb->iso_frame_desc[i].status); 1283 // continue; 1284 } 1285 bytes = urb->iso_frame_desc[i].actual_length; 1286 frames = bytes / stride; 1287 if (!subs->txfr_quirk) 1288 bytes = frames * stride; 1289 if (bytes % (runtime->sample_bits >> 3) != 0) { 1290 int oldbytes = bytes; 1291 bytes = frames * stride; 1292 dev_warn(&subs->dev->dev, 1293 "Corrected urb data len. %d->%d\n", 1294 oldbytes, bytes); 1295 } 1296 /* update the current pointer */ 1297 spin_lock_irqsave(&subs->lock, flags); 1298 oldptr = subs->hwptr_done; 1299 subs->hwptr_done += bytes; 1300 if (subs->hwptr_done >= runtime->buffer_size * stride) 1301 subs->hwptr_done -= runtime->buffer_size * stride; 1302 frames = (bytes + (oldptr % stride)) / stride; 1303 subs->transfer_done += frames; 1304 if (subs->transfer_done >= runtime->period_size) { 1305 subs->transfer_done -= runtime->period_size; 1306 period_elapsed = 1; 1307 } 1308 /* capture delay is by construction limited to one URB, 1309 * reset delays here 1310 */ 1311 runtime->delay = subs->last_delay = 0; 1312 1313 /* realign last_frame_number */ 1314 subs->last_frame_number = current_frame_number; 1315 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */ 1316 1317 spin_unlock_irqrestore(&subs->lock, flags); 1318 /* copy a data chunk */ 1319 if (oldptr + bytes > runtime->buffer_size * stride) { 1320 unsigned int bytes1 = 1321 runtime->buffer_size * stride - oldptr; 1322 memcpy(runtime->dma_area + oldptr, cp, bytes1); 1323 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1); 1324 } else { 1325 memcpy(runtime->dma_area + oldptr, cp, bytes); 1326 } 1327 } 1328 1329 if (period_elapsed) 1330 snd_pcm_period_elapsed(subs->pcm_substream); 1331 } 1332 1333 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs, 1334 struct urb *urb, unsigned int bytes) 1335 { 1336 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1337 unsigned int stride = runtime->frame_bits >> 3; 1338 unsigned int dst_idx = 0; 1339 unsigned int src_idx = subs->hwptr_done; 1340 unsigned int wrap = runtime->buffer_size * stride; 1341 u8 *dst = urb->transfer_buffer; 1342 u8 *src = runtime->dma_area; 1343 u8 marker[] = { 0x05, 0xfa }; 1344 1345 /* 1346 * The DSP DOP format defines a way to transport DSD samples over 1347 * normal PCM data endpoints. It requires stuffing of marker bytes 1348 * (0x05 and 0xfa, alternating per sample frame), and then expects 1349 * 2 additional bytes of actual payload. The whole frame is stored 1350 * LSB. 1351 * 1352 * Hence, for a stereo transport, the buffer layout looks like this, 1353 * where L refers to left channel samples and R to right. 1354 * 1355 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa 1356 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa 1357 * ..... 1358 * 1359 */ 1360 1361 while (bytes--) { 1362 if (++subs->dsd_dop.byte_idx == 3) { 1363 /* frame boundary? */ 1364 dst[dst_idx++] = marker[subs->dsd_dop.marker]; 1365 src_idx += 2; 1366 subs->dsd_dop.byte_idx = 0; 1367 1368 if (++subs->dsd_dop.channel % runtime->channels == 0) { 1369 /* alternate the marker */ 1370 subs->dsd_dop.marker++; 1371 subs->dsd_dop.marker %= ARRAY_SIZE(marker); 1372 subs->dsd_dop.channel = 0; 1373 } 1374 } else { 1375 /* stuff the DSD payload */ 1376 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap; 1377 1378 if (subs->cur_audiofmt->dsd_bitrev) 1379 dst[dst_idx++] = bitrev8(src[idx]); 1380 else 1381 dst[dst_idx++] = src[idx]; 1382 1383 subs->hwptr_done++; 1384 } 1385 } 1386 } 1387 1388 static void prepare_playback_urb(struct snd_usb_substream *subs, 1389 struct urb *urb) 1390 { 1391 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1392 struct snd_usb_endpoint *ep = subs->data_endpoint; 1393 struct snd_urb_ctx *ctx = urb->context; 1394 unsigned int counts, frames, bytes; 1395 int i, stride, period_elapsed = 0; 1396 unsigned long flags; 1397 1398 stride = runtime->frame_bits >> 3; 1399 1400 frames = 0; 1401 urb->number_of_packets = 0; 1402 spin_lock_irqsave(&subs->lock, flags); 1403 subs->frame_limit += ep->max_urb_frames; 1404 for (i = 0; i < ctx->packets; i++) { 1405 if (ctx->packet_size[i]) 1406 counts = ctx->packet_size[i]; 1407 else 1408 counts = snd_usb_endpoint_next_packet_size(ep); 1409 1410 /* set up descriptor */ 1411 urb->iso_frame_desc[i].offset = frames * ep->stride; 1412 urb->iso_frame_desc[i].length = counts * ep->stride; 1413 frames += counts; 1414 urb->number_of_packets++; 1415 subs->transfer_done += counts; 1416 if (subs->transfer_done >= runtime->period_size) { 1417 subs->transfer_done -= runtime->period_size; 1418 subs->frame_limit = 0; 1419 period_elapsed = 1; 1420 if (subs->fmt_type == UAC_FORMAT_TYPE_II) { 1421 if (subs->transfer_done > 0) { 1422 /* FIXME: fill-max mode is not 1423 * supported yet */ 1424 frames -= subs->transfer_done; 1425 counts -= subs->transfer_done; 1426 urb->iso_frame_desc[i].length = 1427 counts * ep->stride; 1428 subs->transfer_done = 0; 1429 } 1430 i++; 1431 if (i < ctx->packets) { 1432 /* add a transfer delimiter */ 1433 urb->iso_frame_desc[i].offset = 1434 frames * ep->stride; 1435 urb->iso_frame_desc[i].length = 0; 1436 urb->number_of_packets++; 1437 } 1438 break; 1439 } 1440 } 1441 /* finish at the period boundary or after enough frames */ 1442 if ((period_elapsed || 1443 subs->transfer_done >= subs->frame_limit) && 1444 !snd_usb_endpoint_implicit_feedback_sink(ep)) 1445 break; 1446 } 1447 bytes = frames * ep->stride; 1448 1449 if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE && 1450 subs->cur_audiofmt->dsd_dop)) { 1451 fill_playback_urb_dsd_dop(subs, urb, bytes); 1452 } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 && 1453 subs->cur_audiofmt->dsd_bitrev)) { 1454 /* bit-reverse the bytes */ 1455 u8 *buf = urb->transfer_buffer; 1456 for (i = 0; i < bytes; i++) { 1457 int idx = (subs->hwptr_done + i) 1458 % (runtime->buffer_size * stride); 1459 buf[i] = bitrev8(runtime->dma_area[idx]); 1460 } 1461 1462 subs->hwptr_done += bytes; 1463 } else { 1464 /* usual PCM */ 1465 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) { 1466 /* err, the transferred area goes over buffer boundary. */ 1467 unsigned int bytes1 = 1468 runtime->buffer_size * stride - subs->hwptr_done; 1469 memcpy(urb->transfer_buffer, 1470 runtime->dma_area + subs->hwptr_done, bytes1); 1471 memcpy(urb->transfer_buffer + bytes1, 1472 runtime->dma_area, bytes - bytes1); 1473 } else { 1474 memcpy(urb->transfer_buffer, 1475 runtime->dma_area + subs->hwptr_done, bytes); 1476 } 1477 1478 subs->hwptr_done += bytes; 1479 } 1480 1481 if (subs->hwptr_done >= runtime->buffer_size * stride) 1482 subs->hwptr_done -= runtime->buffer_size * stride; 1483 1484 /* update delay with exact number of samples queued */ 1485 runtime->delay = subs->last_delay; 1486 runtime->delay += frames; 1487 subs->last_delay = runtime->delay; 1488 1489 /* realign last_frame_number */ 1490 subs->last_frame_number = usb_get_current_frame_number(subs->dev); 1491 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */ 1492 1493 if (subs->trigger_tstamp_pending_update) { 1494 /* this is the first actual URB submitted, 1495 * update trigger timestamp to reflect actual start time 1496 */ 1497 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 1498 subs->trigger_tstamp_pending_update = false; 1499 } 1500 1501 spin_unlock_irqrestore(&subs->lock, flags); 1502 urb->transfer_buffer_length = bytes; 1503 if (period_elapsed) 1504 snd_pcm_period_elapsed(subs->pcm_substream); 1505 } 1506 1507 /* 1508 * process after playback data complete 1509 * - decrease the delay count again 1510 */ 1511 static void retire_playback_urb(struct snd_usb_substream *subs, 1512 struct urb *urb) 1513 { 1514 unsigned long flags; 1515 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1516 struct snd_usb_endpoint *ep = subs->data_endpoint; 1517 int processed = urb->transfer_buffer_length / ep->stride; 1518 int est_delay; 1519 1520 /* ignore the delay accounting when procssed=0 is given, i.e. 1521 * silent payloads are procssed before handling the actual data 1522 */ 1523 if (!processed) 1524 return; 1525 1526 spin_lock_irqsave(&subs->lock, flags); 1527 if (!subs->last_delay) 1528 goto out; /* short path */ 1529 1530 est_delay = snd_usb_pcm_delay(subs, runtime->rate); 1531 /* update delay with exact number of samples played */ 1532 if (processed > subs->last_delay) 1533 subs->last_delay = 0; 1534 else 1535 subs->last_delay -= processed; 1536 runtime->delay = subs->last_delay; 1537 1538 /* 1539 * Report when delay estimate is off by more than 2ms. 1540 * The error should be lower than 2ms since the estimate relies 1541 * on two reads of a counter updated every ms. 1542 */ 1543 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2) 1544 dev_dbg_ratelimited(&subs->dev->dev, 1545 "delay: estimated %d, actual %d\n", 1546 est_delay, subs->last_delay); 1547 1548 if (!subs->running) { 1549 /* update last_frame_number for delay counting here since 1550 * prepare_playback_urb won't be called during pause 1551 */ 1552 subs->last_frame_number = 1553 usb_get_current_frame_number(subs->dev) & 0xff; 1554 } 1555 1556 out: 1557 spin_unlock_irqrestore(&subs->lock, flags); 1558 } 1559 1560 static int snd_usb_playback_open(struct snd_pcm_substream *substream) 1561 { 1562 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK); 1563 } 1564 1565 static int snd_usb_playback_close(struct snd_pcm_substream *substream) 1566 { 1567 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK); 1568 } 1569 1570 static int snd_usb_capture_open(struct snd_pcm_substream *substream) 1571 { 1572 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE); 1573 } 1574 1575 static int snd_usb_capture_close(struct snd_pcm_substream *substream) 1576 { 1577 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE); 1578 } 1579 1580 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream, 1581 int cmd) 1582 { 1583 struct snd_usb_substream *subs = substream->runtime->private_data; 1584 1585 switch (cmd) { 1586 case SNDRV_PCM_TRIGGER_START: 1587 subs->trigger_tstamp_pending_update = true; 1588 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 1589 subs->data_endpoint->prepare_data_urb = prepare_playback_urb; 1590 subs->data_endpoint->retire_data_urb = retire_playback_urb; 1591 subs->running = 1; 1592 return 0; 1593 case SNDRV_PCM_TRIGGER_STOP: 1594 stop_endpoints(subs, false); 1595 subs->running = 0; 1596 return 0; 1597 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 1598 subs->data_endpoint->prepare_data_urb = NULL; 1599 /* keep retire_data_urb for delay calculation */ 1600 subs->data_endpoint->retire_data_urb = retire_playback_urb; 1601 subs->running = 0; 1602 return 0; 1603 } 1604 1605 return -EINVAL; 1606 } 1607 1608 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream, 1609 int cmd) 1610 { 1611 int err; 1612 struct snd_usb_substream *subs = substream->runtime->private_data; 1613 1614 switch (cmd) { 1615 case SNDRV_PCM_TRIGGER_START: 1616 err = start_endpoints(subs, false); 1617 if (err < 0) 1618 return err; 1619 1620 subs->data_endpoint->retire_data_urb = retire_capture_urb; 1621 subs->running = 1; 1622 return 0; 1623 case SNDRV_PCM_TRIGGER_STOP: 1624 stop_endpoints(subs, false); 1625 subs->running = 0; 1626 return 0; 1627 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 1628 subs->data_endpoint->retire_data_urb = NULL; 1629 subs->running = 0; 1630 return 0; 1631 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 1632 subs->data_endpoint->retire_data_urb = retire_capture_urb; 1633 subs->running = 1; 1634 return 0; 1635 } 1636 1637 return -EINVAL; 1638 } 1639 1640 static struct snd_pcm_ops snd_usb_playback_ops = { 1641 .open = snd_usb_playback_open, 1642 .close = snd_usb_playback_close, 1643 .ioctl = snd_pcm_lib_ioctl, 1644 .hw_params = snd_usb_hw_params, 1645 .hw_free = snd_usb_hw_free, 1646 .prepare = snd_usb_pcm_prepare, 1647 .trigger = snd_usb_substream_playback_trigger, 1648 .pointer = snd_usb_pcm_pointer, 1649 .page = snd_pcm_lib_get_vmalloc_page, 1650 .mmap = snd_pcm_lib_mmap_vmalloc, 1651 }; 1652 1653 static struct snd_pcm_ops snd_usb_capture_ops = { 1654 .open = snd_usb_capture_open, 1655 .close = snd_usb_capture_close, 1656 .ioctl = snd_pcm_lib_ioctl, 1657 .hw_params = snd_usb_hw_params, 1658 .hw_free = snd_usb_hw_free, 1659 .prepare = snd_usb_pcm_prepare, 1660 .trigger = snd_usb_substream_capture_trigger, 1661 .pointer = snd_usb_pcm_pointer, 1662 .page = snd_pcm_lib_get_vmalloc_page, 1663 .mmap = snd_pcm_lib_mmap_vmalloc, 1664 }; 1665 1666 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream) 1667 { 1668 snd_pcm_set_ops(pcm, stream, 1669 stream == SNDRV_PCM_STREAM_PLAYBACK ? 1670 &snd_usb_playback_ops : &snd_usb_capture_ops); 1671 } 1672