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 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 } 178 179 static 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 */ 203 int 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 } 220 221 static 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 } 272 273 static 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 } 286 287 static 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 } 315 316 static 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; 365 366 add_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 } 377 378 static 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 if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) || 397 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) { 398 399 /* 400 * In these modes the notion of sync_endpoint is irrelevant. 401 * Reset pointers to avoid using stale data from previously 402 * used settings, e.g. when configuration and endpoints were 403 * changed 404 */ 405 406 subs->sync_endpoint = NULL; 407 subs->data_endpoint->sync_master = NULL; 408 } 409 410 err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr); 411 if (err < 0) 412 return err; 413 414 if (altsd->bNumEndpoints < 2) 415 return 0; 416 417 if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC || 418 attr == USB_ENDPOINT_SYNC_ADAPTIVE)) || 419 (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE)) 420 return 0; 421 422 /* 423 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see 424 * if we don't find a sync endpoint, as on M-Audio Transit. In case of 425 * error fall back to SYNC mode and don't create sync endpoint 426 */ 427 428 /* check sync-pipe endpoint */ 429 /* ... and check descriptor size before accessing bSynchAddress 430 because there is a version of the SB Audigy 2 NX firmware lacking 431 the audio fields in the endpoint descriptors */ 432 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC || 433 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE && 434 get_endpoint(alts, 1)->bSynchAddress != 0)) { 435 dev_err(&dev->dev, 436 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n", 437 fmt->iface, fmt->altsetting, 438 get_endpoint(alts, 1)->bmAttributes, 439 get_endpoint(alts, 1)->bLength, 440 get_endpoint(alts, 1)->bSynchAddress); 441 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE) 442 return 0; 443 return -EINVAL; 444 } 445 ep = get_endpoint(alts, 1)->bEndpointAddress; 446 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE && 447 ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) || 448 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) { 449 dev_err(&dev->dev, 450 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n", 451 fmt->iface, fmt->altsetting, 452 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress); 453 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE) 454 return 0; 455 return -EINVAL; 456 } 457 458 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK) 459 == USB_ENDPOINT_USAGE_IMPLICIT_FB; 460 461 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip, 462 alts, ep, !subs->direction, 463 implicit_fb ? 464 SND_USB_ENDPOINT_TYPE_DATA : 465 SND_USB_ENDPOINT_TYPE_SYNC); 466 if (!subs->sync_endpoint) { 467 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE) 468 return 0; 469 return -EINVAL; 470 } 471 472 subs->data_endpoint->sync_master = subs->sync_endpoint; 473 474 return 0; 475 } 476 477 /* 478 * find a matching format and set up the interface 479 */ 480 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt) 481 { 482 struct usb_device *dev = subs->dev; 483 struct usb_host_interface *alts; 484 struct usb_interface_descriptor *altsd; 485 struct usb_interface *iface; 486 int err; 487 488 iface = usb_ifnum_to_if(dev, fmt->iface); 489 if (WARN_ON(!iface)) 490 return -EINVAL; 491 alts = &iface->altsetting[fmt->altset_idx]; 492 altsd = get_iface_desc(alts); 493 if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting)) 494 return -EINVAL; 495 496 if (fmt == subs->cur_audiofmt) 497 return 0; 498 499 /* close the old interface */ 500 if (subs->interface >= 0 && subs->interface != fmt->iface) { 501 err = usb_set_interface(subs->dev, subs->interface, 0); 502 if (err < 0) { 503 dev_err(&dev->dev, 504 "%d:%d: return to setting 0 failed (%d)\n", 505 fmt->iface, fmt->altsetting, err); 506 return -EIO; 507 } 508 subs->interface = -1; 509 subs->altset_idx = 0; 510 } 511 512 /* set interface */ 513 if (subs->interface != fmt->iface || 514 subs->altset_idx != fmt->altset_idx) { 515 516 err = snd_usb_select_mode_quirk(subs, fmt); 517 if (err < 0) 518 return -EIO; 519 520 err = usb_set_interface(dev, fmt->iface, fmt->altsetting); 521 if (err < 0) { 522 dev_err(&dev->dev, 523 "%d:%d: usb_set_interface failed (%d)\n", 524 fmt->iface, fmt->altsetting, err); 525 return -EIO; 526 } 527 dev_dbg(&dev->dev, "setting usb interface %d:%d\n", 528 fmt->iface, fmt->altsetting); 529 subs->interface = fmt->iface; 530 subs->altset_idx = fmt->altset_idx; 531 532 snd_usb_set_interface_quirk(dev); 533 } 534 535 subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip, 536 alts, fmt->endpoint, subs->direction, 537 SND_USB_ENDPOINT_TYPE_DATA); 538 539 if (!subs->data_endpoint) 540 return -EINVAL; 541 542 err = set_sync_endpoint(subs, fmt, dev, alts, altsd); 543 if (err < 0) 544 return err; 545 546 err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt); 547 if (err < 0) 548 return err; 549 550 subs->cur_audiofmt = fmt; 551 552 snd_usb_set_format_quirk(subs, fmt); 553 554 return 0; 555 } 556 557 /* 558 * Return the score of matching two audioformats. 559 * Veto the audioformat if: 560 * - It has no channels for some reason. 561 * - Requested PCM format is not supported. 562 * - Requested sample rate is not supported. 563 */ 564 static int match_endpoint_audioformats(struct snd_usb_substream *subs, 565 struct audioformat *fp, 566 struct audioformat *match, int rate, 567 snd_pcm_format_t pcm_format) 568 { 569 int i; 570 int score = 0; 571 572 if (fp->channels < 1) { 573 dev_dbg(&subs->dev->dev, 574 "%s: (fmt @%p) no channels\n", __func__, fp); 575 return 0; 576 } 577 578 if (!(fp->formats & pcm_format_to_bits(pcm_format))) { 579 dev_dbg(&subs->dev->dev, 580 "%s: (fmt @%p) no match for format %d\n", __func__, 581 fp, pcm_format); 582 return 0; 583 } 584 585 for (i = 0; i < fp->nr_rates; i++) { 586 if (fp->rate_table[i] == rate) { 587 score++; 588 break; 589 } 590 } 591 if (!score) { 592 dev_dbg(&subs->dev->dev, 593 "%s: (fmt @%p) no match for rate %d\n", __func__, 594 fp, rate); 595 return 0; 596 } 597 598 if (fp->channels == match->channels) 599 score++; 600 601 dev_dbg(&subs->dev->dev, 602 "%s: (fmt @%p) score %d\n", __func__, fp, score); 603 604 return score; 605 } 606 607 /* 608 * Configure the sync ep using the rate and pcm format of the data ep. 609 */ 610 static int configure_sync_endpoint(struct snd_usb_substream *subs) 611 { 612 int ret; 613 struct audioformat *fp; 614 struct audioformat *sync_fp = NULL; 615 int cur_score = 0; 616 int sync_period_bytes = subs->period_bytes; 617 struct snd_usb_substream *sync_subs = 618 &subs->stream->substream[subs->direction ^ 1]; 619 620 if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA || 621 !subs->stream) 622 return snd_usb_endpoint_set_params(subs->sync_endpoint, 623 subs->pcm_format, 624 subs->channels, 625 subs->period_bytes, 626 0, 0, 627 subs->cur_rate, 628 subs->cur_audiofmt, 629 NULL); 630 631 /* Try to find the best matching audioformat. */ 632 list_for_each_entry(fp, &sync_subs->fmt_list, list) { 633 int score = match_endpoint_audioformats(subs, 634 fp, subs->cur_audiofmt, 635 subs->cur_rate, subs->pcm_format); 636 637 if (score > cur_score) { 638 sync_fp = fp; 639 cur_score = score; 640 } 641 } 642 643 if (unlikely(sync_fp == NULL)) { 644 dev_err(&subs->dev->dev, 645 "%s: no valid audioformat for sync ep %x found\n", 646 __func__, sync_subs->ep_num); 647 return -EINVAL; 648 } 649 650 /* 651 * Recalculate the period bytes if channel number differ between 652 * data and sync ep audioformat. 653 */ 654 if (sync_fp->channels != subs->channels) { 655 sync_period_bytes = (subs->period_bytes / subs->channels) * 656 sync_fp->channels; 657 dev_dbg(&subs->dev->dev, 658 "%s: adjusted sync ep period bytes (%d -> %d)\n", 659 __func__, subs->period_bytes, sync_period_bytes); 660 } 661 662 ret = snd_usb_endpoint_set_params(subs->sync_endpoint, 663 subs->pcm_format, 664 sync_fp->channels, 665 sync_period_bytes, 666 0, 0, 667 subs->cur_rate, 668 sync_fp, 669 NULL); 670 671 return ret; 672 } 673 674 /* 675 * configure endpoint params 676 * 677 * called during initial setup and upon resume 678 */ 679 static int configure_endpoint(struct snd_usb_substream *subs) 680 { 681 int ret; 682 683 /* format changed */ 684 stop_endpoints(subs, true); 685 ret = snd_usb_endpoint_set_params(subs->data_endpoint, 686 subs->pcm_format, 687 subs->channels, 688 subs->period_bytes, 689 subs->period_frames, 690 subs->buffer_periods, 691 subs->cur_rate, 692 subs->cur_audiofmt, 693 subs->sync_endpoint); 694 if (ret < 0) 695 return ret; 696 697 if (subs->sync_endpoint) 698 ret = configure_sync_endpoint(subs); 699 700 return ret; 701 } 702 703 /* 704 * hw_params callback 705 * 706 * allocate a buffer and set the given audio format. 707 * 708 * so far we use a physically linear buffer although packetize transfer 709 * doesn't need a continuous area. 710 * if sg buffer is supported on the later version of alsa, we'll follow 711 * that. 712 */ 713 static int snd_usb_hw_params(struct snd_pcm_substream *substream, 714 struct snd_pcm_hw_params *hw_params) 715 { 716 struct snd_usb_substream *subs = substream->runtime->private_data; 717 struct audioformat *fmt; 718 int ret; 719 720 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream, 721 params_buffer_bytes(hw_params)); 722 if (ret < 0) 723 return ret; 724 725 subs->pcm_format = params_format(hw_params); 726 subs->period_bytes = params_period_bytes(hw_params); 727 subs->period_frames = params_period_size(hw_params); 728 subs->buffer_periods = params_periods(hw_params); 729 subs->channels = params_channels(hw_params); 730 subs->cur_rate = params_rate(hw_params); 731 732 fmt = find_format(subs); 733 if (!fmt) { 734 dev_dbg(&subs->dev->dev, 735 "cannot set format: format = %#x, rate = %d, channels = %d\n", 736 subs->pcm_format, subs->cur_rate, subs->channels); 737 return -EINVAL; 738 } 739 740 ret = snd_usb_lock_shutdown(subs->stream->chip); 741 if (ret < 0) 742 return ret; 743 ret = set_format(subs, fmt); 744 snd_usb_unlock_shutdown(subs->stream->chip); 745 if (ret < 0) 746 return ret; 747 748 subs->interface = fmt->iface; 749 subs->altset_idx = fmt->altset_idx; 750 subs->need_setup_ep = true; 751 752 return 0; 753 } 754 755 /* 756 * hw_free callback 757 * 758 * reset the audio format and release the buffer 759 */ 760 static int snd_usb_hw_free(struct snd_pcm_substream *substream) 761 { 762 struct snd_usb_substream *subs = substream->runtime->private_data; 763 764 subs->cur_audiofmt = NULL; 765 subs->cur_rate = 0; 766 subs->period_bytes = 0; 767 if (!snd_usb_lock_shutdown(subs->stream->chip)) { 768 stop_endpoints(subs, true); 769 snd_usb_endpoint_deactivate(subs->sync_endpoint); 770 snd_usb_endpoint_deactivate(subs->data_endpoint); 771 snd_usb_unlock_shutdown(subs->stream->chip); 772 } 773 return snd_pcm_lib_free_vmalloc_buffer(substream); 774 } 775 776 /* 777 * prepare callback 778 * 779 * only a few subtle things... 780 */ 781 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream) 782 { 783 struct snd_pcm_runtime *runtime = substream->runtime; 784 struct snd_usb_substream *subs = runtime->private_data; 785 struct usb_host_interface *alts; 786 struct usb_interface *iface; 787 int ret; 788 789 if (! subs->cur_audiofmt) { 790 dev_err(&subs->dev->dev, "no format is specified!\n"); 791 return -ENXIO; 792 } 793 794 ret = snd_usb_lock_shutdown(subs->stream->chip); 795 if (ret < 0) 796 return ret; 797 if (snd_BUG_ON(!subs->data_endpoint)) { 798 ret = -EIO; 799 goto unlock; 800 } 801 802 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint); 803 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint); 804 805 ret = set_format(subs, subs->cur_audiofmt); 806 if (ret < 0) 807 goto unlock; 808 809 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface); 810 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx]; 811 ret = snd_usb_init_sample_rate(subs->stream->chip, 812 subs->cur_audiofmt->iface, 813 alts, 814 subs->cur_audiofmt, 815 subs->cur_rate); 816 if (ret < 0) 817 goto unlock; 818 819 if (subs->need_setup_ep) { 820 ret = configure_endpoint(subs); 821 if (ret < 0) 822 goto unlock; 823 subs->need_setup_ep = false; 824 } 825 826 /* some unit conversions in runtime */ 827 subs->data_endpoint->maxframesize = 828 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize); 829 subs->data_endpoint->curframesize = 830 bytes_to_frames(runtime, subs->data_endpoint->curpacksize); 831 832 /* reset the pointer */ 833 subs->hwptr_done = 0; 834 subs->transfer_done = 0; 835 subs->last_delay = 0; 836 subs->last_frame_number = 0; 837 runtime->delay = 0; 838 839 /* for playback, submit the URBs now; otherwise, the first hwptr_done 840 * updates for all URBs would happen at the same time when starting */ 841 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) 842 ret = start_endpoints(subs, true); 843 844 unlock: 845 snd_usb_unlock_shutdown(subs->stream->chip); 846 return ret; 847 } 848 849 static struct snd_pcm_hardware snd_usb_hardware = 850 { 851 .info = SNDRV_PCM_INFO_MMAP | 852 SNDRV_PCM_INFO_MMAP_VALID | 853 SNDRV_PCM_INFO_BATCH | 854 SNDRV_PCM_INFO_INTERLEAVED | 855 SNDRV_PCM_INFO_BLOCK_TRANSFER | 856 SNDRV_PCM_INFO_PAUSE, 857 .buffer_bytes_max = 1024 * 1024, 858 .period_bytes_min = 64, 859 .period_bytes_max = 512 * 1024, 860 .periods_min = 2, 861 .periods_max = 1024, 862 }; 863 864 static int hw_check_valid_format(struct snd_usb_substream *subs, 865 struct snd_pcm_hw_params *params, 866 struct audioformat *fp) 867 { 868 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 869 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 870 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 871 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME); 872 struct snd_mask check_fmts; 873 unsigned int ptime; 874 875 /* check the format */ 876 snd_mask_none(&check_fmts); 877 check_fmts.bits[0] = (u32)fp->formats; 878 check_fmts.bits[1] = (u32)(fp->formats >> 32); 879 snd_mask_intersect(&check_fmts, fmts); 880 if (snd_mask_empty(&check_fmts)) { 881 hwc_debug(" > check: no supported format %d\n", fp->format); 882 return 0; 883 } 884 /* check the channels */ 885 if (fp->channels < ct->min || fp->channels > ct->max) { 886 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max); 887 return 0; 888 } 889 /* check the rate is within the range */ 890 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) { 891 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max); 892 return 0; 893 } 894 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) { 895 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min); 896 return 0; 897 } 898 /* check whether the period time is >= the data packet interval */ 899 if (subs->speed != USB_SPEED_FULL) { 900 ptime = 125 * (1 << fp->datainterval); 901 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) { 902 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max); 903 return 0; 904 } 905 } 906 return 1; 907 } 908 909 static int hw_rule_rate(struct snd_pcm_hw_params *params, 910 struct snd_pcm_hw_rule *rule) 911 { 912 struct snd_usb_substream *subs = rule->private; 913 struct audioformat *fp; 914 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 915 unsigned int rmin, rmax; 916 int changed; 917 918 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max); 919 changed = 0; 920 rmin = rmax = 0; 921 list_for_each_entry(fp, &subs->fmt_list, list) { 922 if (!hw_check_valid_format(subs, params, fp)) 923 continue; 924 if (changed++) { 925 if (rmin > fp->rate_min) 926 rmin = fp->rate_min; 927 if (rmax < fp->rate_max) 928 rmax = fp->rate_max; 929 } else { 930 rmin = fp->rate_min; 931 rmax = fp->rate_max; 932 } 933 } 934 935 if (!changed) { 936 hwc_debug(" --> get empty\n"); 937 it->empty = 1; 938 return -EINVAL; 939 } 940 941 changed = 0; 942 if (it->min < rmin) { 943 it->min = rmin; 944 it->openmin = 0; 945 changed = 1; 946 } 947 if (it->max > rmax) { 948 it->max = rmax; 949 it->openmax = 0; 950 changed = 1; 951 } 952 if (snd_interval_checkempty(it)) { 953 it->empty = 1; 954 return -EINVAL; 955 } 956 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed); 957 return changed; 958 } 959 960 961 static int hw_rule_channels(struct snd_pcm_hw_params *params, 962 struct snd_pcm_hw_rule *rule) 963 { 964 struct snd_usb_substream *subs = rule->private; 965 struct audioformat *fp; 966 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 967 unsigned int rmin, rmax; 968 int changed; 969 970 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max); 971 changed = 0; 972 rmin = rmax = 0; 973 list_for_each_entry(fp, &subs->fmt_list, list) { 974 if (!hw_check_valid_format(subs, params, fp)) 975 continue; 976 if (changed++) { 977 if (rmin > fp->channels) 978 rmin = fp->channels; 979 if (rmax < fp->channels) 980 rmax = fp->channels; 981 } else { 982 rmin = fp->channels; 983 rmax = fp->channels; 984 } 985 } 986 987 if (!changed) { 988 hwc_debug(" --> get empty\n"); 989 it->empty = 1; 990 return -EINVAL; 991 } 992 993 changed = 0; 994 if (it->min < rmin) { 995 it->min = rmin; 996 it->openmin = 0; 997 changed = 1; 998 } 999 if (it->max > rmax) { 1000 it->max = rmax; 1001 it->openmax = 0; 1002 changed = 1; 1003 } 1004 if (snd_interval_checkempty(it)) { 1005 it->empty = 1; 1006 return -EINVAL; 1007 } 1008 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed); 1009 return changed; 1010 } 1011 1012 static int hw_rule_format(struct snd_pcm_hw_params *params, 1013 struct snd_pcm_hw_rule *rule) 1014 { 1015 struct snd_usb_substream *subs = rule->private; 1016 struct audioformat *fp; 1017 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 1018 u64 fbits; 1019 u32 oldbits[2]; 1020 int changed; 1021 1022 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]); 1023 fbits = 0; 1024 list_for_each_entry(fp, &subs->fmt_list, list) { 1025 if (!hw_check_valid_format(subs, params, fp)) 1026 continue; 1027 fbits |= fp->formats; 1028 } 1029 1030 oldbits[0] = fmt->bits[0]; 1031 oldbits[1] = fmt->bits[1]; 1032 fmt->bits[0] &= (u32)fbits; 1033 fmt->bits[1] &= (u32)(fbits >> 32); 1034 if (!fmt->bits[0] && !fmt->bits[1]) { 1035 hwc_debug(" --> get empty\n"); 1036 return -EINVAL; 1037 } 1038 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]); 1039 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed); 1040 return changed; 1041 } 1042 1043 static int hw_rule_period_time(struct snd_pcm_hw_params *params, 1044 struct snd_pcm_hw_rule *rule) 1045 { 1046 struct snd_usb_substream *subs = rule->private; 1047 struct audioformat *fp; 1048 struct snd_interval *it; 1049 unsigned char min_datainterval; 1050 unsigned int pmin; 1051 int changed; 1052 1053 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME); 1054 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max); 1055 min_datainterval = 0xff; 1056 list_for_each_entry(fp, &subs->fmt_list, list) { 1057 if (!hw_check_valid_format(subs, params, fp)) 1058 continue; 1059 min_datainterval = min(min_datainterval, fp->datainterval); 1060 } 1061 if (min_datainterval == 0xff) { 1062 hwc_debug(" --> get empty\n"); 1063 it->empty = 1; 1064 return -EINVAL; 1065 } 1066 pmin = 125 * (1 << min_datainterval); 1067 changed = 0; 1068 if (it->min < pmin) { 1069 it->min = pmin; 1070 it->openmin = 0; 1071 changed = 1; 1072 } 1073 if (snd_interval_checkempty(it)) { 1074 it->empty = 1; 1075 return -EINVAL; 1076 } 1077 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed); 1078 return changed; 1079 } 1080 1081 /* 1082 * If the device supports unusual bit rates, does the request meet these? 1083 */ 1084 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime, 1085 struct snd_usb_substream *subs) 1086 { 1087 struct audioformat *fp; 1088 int *rate_list; 1089 int count = 0, needs_knot = 0; 1090 int err; 1091 1092 kfree(subs->rate_list.list); 1093 subs->rate_list.list = NULL; 1094 1095 list_for_each_entry(fp, &subs->fmt_list, list) { 1096 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS) 1097 return 0; 1098 count += fp->nr_rates; 1099 if (fp->rates & SNDRV_PCM_RATE_KNOT) 1100 needs_knot = 1; 1101 } 1102 if (!needs_knot) 1103 return 0; 1104 1105 subs->rate_list.list = rate_list = 1106 kmalloc(sizeof(int) * count, GFP_KERNEL); 1107 if (!subs->rate_list.list) 1108 return -ENOMEM; 1109 subs->rate_list.count = count; 1110 subs->rate_list.mask = 0; 1111 count = 0; 1112 list_for_each_entry(fp, &subs->fmt_list, list) { 1113 int i; 1114 for (i = 0; i < fp->nr_rates; i++) 1115 rate_list[count++] = fp->rate_table[i]; 1116 } 1117 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1118 &subs->rate_list); 1119 if (err < 0) 1120 return err; 1121 1122 return 0; 1123 } 1124 1125 1126 /* 1127 * set up the runtime hardware information. 1128 */ 1129 1130 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs) 1131 { 1132 struct audioformat *fp; 1133 unsigned int pt, ptmin; 1134 int param_period_time_if_needed; 1135 int err; 1136 1137 runtime->hw.formats = subs->formats; 1138 1139 runtime->hw.rate_min = 0x7fffffff; 1140 runtime->hw.rate_max = 0; 1141 runtime->hw.channels_min = 256; 1142 runtime->hw.channels_max = 0; 1143 runtime->hw.rates = 0; 1144 ptmin = UINT_MAX; 1145 /* check min/max rates and channels */ 1146 list_for_each_entry(fp, &subs->fmt_list, list) { 1147 runtime->hw.rates |= fp->rates; 1148 if (runtime->hw.rate_min > fp->rate_min) 1149 runtime->hw.rate_min = fp->rate_min; 1150 if (runtime->hw.rate_max < fp->rate_max) 1151 runtime->hw.rate_max = fp->rate_max; 1152 if (runtime->hw.channels_min > fp->channels) 1153 runtime->hw.channels_min = fp->channels; 1154 if (runtime->hw.channels_max < fp->channels) 1155 runtime->hw.channels_max = fp->channels; 1156 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) { 1157 /* FIXME: there might be more than one audio formats... */ 1158 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max = 1159 fp->frame_size; 1160 } 1161 pt = 125 * (1 << fp->datainterval); 1162 ptmin = min(ptmin, pt); 1163 } 1164 err = snd_usb_autoresume(subs->stream->chip); 1165 if (err < 0) 1166 return err; 1167 1168 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME; 1169 if (subs->speed == USB_SPEED_FULL) 1170 /* full speed devices have fixed data packet interval */ 1171 ptmin = 1000; 1172 if (ptmin == 1000) 1173 /* if period time doesn't go below 1 ms, no rules needed */ 1174 param_period_time_if_needed = -1; 1175 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1176 ptmin, UINT_MAX); 1177 1178 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1179 hw_rule_rate, subs, 1180 SNDRV_PCM_HW_PARAM_FORMAT, 1181 SNDRV_PCM_HW_PARAM_CHANNELS, 1182 param_period_time_if_needed, 1183 -1)) < 0) 1184 goto rep_err; 1185 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 1186 hw_rule_channels, subs, 1187 SNDRV_PCM_HW_PARAM_FORMAT, 1188 SNDRV_PCM_HW_PARAM_RATE, 1189 param_period_time_if_needed, 1190 -1)) < 0) 1191 goto rep_err; 1192 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 1193 hw_rule_format, subs, 1194 SNDRV_PCM_HW_PARAM_RATE, 1195 SNDRV_PCM_HW_PARAM_CHANNELS, 1196 param_period_time_if_needed, 1197 -1)) < 0) 1198 goto rep_err; 1199 if (param_period_time_if_needed >= 0) { 1200 err = snd_pcm_hw_rule_add(runtime, 0, 1201 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1202 hw_rule_period_time, subs, 1203 SNDRV_PCM_HW_PARAM_FORMAT, 1204 SNDRV_PCM_HW_PARAM_CHANNELS, 1205 SNDRV_PCM_HW_PARAM_RATE, 1206 -1); 1207 if (err < 0) 1208 goto rep_err; 1209 } 1210 if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0) 1211 goto rep_err; 1212 return 0; 1213 1214 rep_err: 1215 snd_usb_autosuspend(subs->stream->chip); 1216 return err; 1217 } 1218 1219 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction) 1220 { 1221 struct snd_usb_stream *as = snd_pcm_substream_chip(substream); 1222 struct snd_pcm_runtime *runtime = substream->runtime; 1223 struct snd_usb_substream *subs = &as->substream[direction]; 1224 1225 subs->interface = -1; 1226 subs->altset_idx = 0; 1227 runtime->hw = snd_usb_hardware; 1228 runtime->private_data = subs; 1229 subs->pcm_substream = substream; 1230 /* runtime PM is also done there */ 1231 1232 /* initialize DSD/DOP context */ 1233 subs->dsd_dop.byte_idx = 0; 1234 subs->dsd_dop.channel = 0; 1235 subs->dsd_dop.marker = 1; 1236 1237 return setup_hw_info(runtime, subs); 1238 } 1239 1240 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction) 1241 { 1242 struct snd_usb_stream *as = snd_pcm_substream_chip(substream); 1243 struct snd_usb_substream *subs = &as->substream[direction]; 1244 1245 stop_endpoints(subs, true); 1246 1247 if (subs->interface >= 0 && 1248 !snd_usb_lock_shutdown(subs->stream->chip)) { 1249 usb_set_interface(subs->dev, subs->interface, 0); 1250 subs->interface = -1; 1251 snd_usb_unlock_shutdown(subs->stream->chip); 1252 } 1253 1254 subs->pcm_substream = NULL; 1255 snd_usb_autosuspend(subs->stream->chip); 1256 1257 return 0; 1258 } 1259 1260 /* Since a URB can handle only a single linear buffer, we must use double 1261 * buffering when the data to be transferred overflows the buffer boundary. 1262 * To avoid inconsistencies when updating hwptr_done, we use double buffering 1263 * for all URBs. 1264 */ 1265 static void retire_capture_urb(struct snd_usb_substream *subs, 1266 struct urb *urb) 1267 { 1268 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1269 unsigned int stride, frames, bytes, oldptr; 1270 int i, period_elapsed = 0; 1271 unsigned long flags; 1272 unsigned char *cp; 1273 int current_frame_number; 1274 1275 /* read frame number here, update pointer in critical section */ 1276 current_frame_number = usb_get_current_frame_number(subs->dev); 1277 1278 stride = runtime->frame_bits >> 3; 1279 1280 for (i = 0; i < urb->number_of_packets; i++) { 1281 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj; 1282 if (urb->iso_frame_desc[i].status && printk_ratelimit()) { 1283 dev_dbg(&subs->dev->dev, "frame %d active: %d\n", 1284 i, urb->iso_frame_desc[i].status); 1285 // continue; 1286 } 1287 bytes = urb->iso_frame_desc[i].actual_length; 1288 frames = bytes / stride; 1289 if (!subs->txfr_quirk) 1290 bytes = frames * stride; 1291 if (bytes % (runtime->sample_bits >> 3) != 0) { 1292 int oldbytes = bytes; 1293 bytes = frames * stride; 1294 dev_warn(&subs->dev->dev, 1295 "Corrected urb data len. %d->%d\n", 1296 oldbytes, bytes); 1297 } 1298 /* update the current pointer */ 1299 spin_lock_irqsave(&subs->lock, flags); 1300 oldptr = subs->hwptr_done; 1301 subs->hwptr_done += bytes; 1302 if (subs->hwptr_done >= runtime->buffer_size * stride) 1303 subs->hwptr_done -= runtime->buffer_size * stride; 1304 frames = (bytes + (oldptr % stride)) / stride; 1305 subs->transfer_done += frames; 1306 if (subs->transfer_done >= runtime->period_size) { 1307 subs->transfer_done -= runtime->period_size; 1308 period_elapsed = 1; 1309 } 1310 /* capture delay is by construction limited to one URB, 1311 * reset delays here 1312 */ 1313 runtime->delay = subs->last_delay = 0; 1314 1315 /* realign last_frame_number */ 1316 subs->last_frame_number = current_frame_number; 1317 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */ 1318 1319 spin_unlock_irqrestore(&subs->lock, flags); 1320 /* copy a data chunk */ 1321 if (oldptr + bytes > runtime->buffer_size * stride) { 1322 unsigned int bytes1 = 1323 runtime->buffer_size * stride - oldptr; 1324 memcpy(runtime->dma_area + oldptr, cp, bytes1); 1325 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1); 1326 } else { 1327 memcpy(runtime->dma_area + oldptr, cp, bytes); 1328 } 1329 } 1330 1331 if (period_elapsed) 1332 snd_pcm_period_elapsed(subs->pcm_substream); 1333 } 1334 1335 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs, 1336 struct urb *urb, unsigned int bytes) 1337 { 1338 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1339 unsigned int stride = runtime->frame_bits >> 3; 1340 unsigned int dst_idx = 0; 1341 unsigned int src_idx = subs->hwptr_done; 1342 unsigned int wrap = runtime->buffer_size * stride; 1343 u8 *dst = urb->transfer_buffer; 1344 u8 *src = runtime->dma_area; 1345 u8 marker[] = { 0x05, 0xfa }; 1346 1347 /* 1348 * The DSP DOP format defines a way to transport DSD samples over 1349 * normal PCM data endpoints. It requires stuffing of marker bytes 1350 * (0x05 and 0xfa, alternating per sample frame), and then expects 1351 * 2 additional bytes of actual payload. The whole frame is stored 1352 * LSB. 1353 * 1354 * Hence, for a stereo transport, the buffer layout looks like this, 1355 * where L refers to left channel samples and R to right. 1356 * 1357 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa 1358 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa 1359 * ..... 1360 * 1361 */ 1362 1363 while (bytes--) { 1364 if (++subs->dsd_dop.byte_idx == 3) { 1365 /* frame boundary? */ 1366 dst[dst_idx++] = marker[subs->dsd_dop.marker]; 1367 src_idx += 2; 1368 subs->dsd_dop.byte_idx = 0; 1369 1370 if (++subs->dsd_dop.channel % runtime->channels == 0) { 1371 /* alternate the marker */ 1372 subs->dsd_dop.marker++; 1373 subs->dsd_dop.marker %= ARRAY_SIZE(marker); 1374 subs->dsd_dop.channel = 0; 1375 } 1376 } else { 1377 /* stuff the DSD payload */ 1378 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap; 1379 1380 if (subs->cur_audiofmt->dsd_bitrev) 1381 dst[dst_idx++] = bitrev8(src[idx]); 1382 else 1383 dst[dst_idx++] = src[idx]; 1384 1385 subs->hwptr_done++; 1386 } 1387 } 1388 if (subs->hwptr_done >= runtime->buffer_size * stride) 1389 subs->hwptr_done -= runtime->buffer_size * stride; 1390 } 1391 1392 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb, 1393 int offset, int stride, unsigned int bytes) 1394 { 1395 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1396 1397 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) { 1398 /* err, the transferred area goes over buffer boundary. */ 1399 unsigned int bytes1 = 1400 runtime->buffer_size * stride - subs->hwptr_done; 1401 memcpy(urb->transfer_buffer + offset, 1402 runtime->dma_area + subs->hwptr_done, bytes1); 1403 memcpy(urb->transfer_buffer + offset + bytes1, 1404 runtime->dma_area, bytes - bytes1); 1405 } else { 1406 memcpy(urb->transfer_buffer + offset, 1407 runtime->dma_area + subs->hwptr_done, bytes); 1408 } 1409 subs->hwptr_done += bytes; 1410 if (subs->hwptr_done >= runtime->buffer_size * stride) 1411 subs->hwptr_done -= runtime->buffer_size * stride; 1412 } 1413 1414 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs, 1415 struct urb *urb, int stride, 1416 unsigned int bytes) 1417 { 1418 __le32 packet_length; 1419 int i; 1420 1421 /* Put __le32 length descriptor at start of each packet. */ 1422 for (i = 0; i < urb->number_of_packets; i++) { 1423 unsigned int length = urb->iso_frame_desc[i].length; 1424 unsigned int offset = urb->iso_frame_desc[i].offset; 1425 1426 packet_length = cpu_to_le32(length); 1427 offset += i * sizeof(packet_length); 1428 urb->iso_frame_desc[i].offset = offset; 1429 urb->iso_frame_desc[i].length += sizeof(packet_length); 1430 memcpy(urb->transfer_buffer + offset, 1431 &packet_length, sizeof(packet_length)); 1432 copy_to_urb(subs, urb, offset + sizeof(packet_length), 1433 stride, length); 1434 } 1435 /* Adjust transfer size accordingly. */ 1436 bytes += urb->number_of_packets * sizeof(packet_length); 1437 return bytes; 1438 } 1439 1440 static void prepare_playback_urb(struct snd_usb_substream *subs, 1441 struct urb *urb) 1442 { 1443 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1444 struct snd_usb_endpoint *ep = subs->data_endpoint; 1445 struct snd_urb_ctx *ctx = urb->context; 1446 unsigned int counts, frames, bytes; 1447 int i, stride, period_elapsed = 0; 1448 unsigned long flags; 1449 1450 stride = runtime->frame_bits >> 3; 1451 1452 frames = 0; 1453 urb->number_of_packets = 0; 1454 spin_lock_irqsave(&subs->lock, flags); 1455 subs->frame_limit += ep->max_urb_frames; 1456 for (i = 0; i < ctx->packets; i++) { 1457 if (ctx->packet_size[i]) 1458 counts = ctx->packet_size[i]; 1459 else 1460 counts = snd_usb_endpoint_next_packet_size(ep); 1461 1462 /* set up descriptor */ 1463 urb->iso_frame_desc[i].offset = frames * ep->stride; 1464 urb->iso_frame_desc[i].length = counts * ep->stride; 1465 frames += counts; 1466 urb->number_of_packets++; 1467 subs->transfer_done += counts; 1468 if (subs->transfer_done >= runtime->period_size) { 1469 subs->transfer_done -= runtime->period_size; 1470 subs->frame_limit = 0; 1471 period_elapsed = 1; 1472 if (subs->fmt_type == UAC_FORMAT_TYPE_II) { 1473 if (subs->transfer_done > 0) { 1474 /* FIXME: fill-max mode is not 1475 * supported yet */ 1476 frames -= subs->transfer_done; 1477 counts -= subs->transfer_done; 1478 urb->iso_frame_desc[i].length = 1479 counts * ep->stride; 1480 subs->transfer_done = 0; 1481 } 1482 i++; 1483 if (i < ctx->packets) { 1484 /* add a transfer delimiter */ 1485 urb->iso_frame_desc[i].offset = 1486 frames * ep->stride; 1487 urb->iso_frame_desc[i].length = 0; 1488 urb->number_of_packets++; 1489 } 1490 break; 1491 } 1492 } 1493 /* finish at the period boundary or after enough frames */ 1494 if ((period_elapsed || 1495 subs->transfer_done >= subs->frame_limit) && 1496 !snd_usb_endpoint_implicit_feedback_sink(ep)) 1497 break; 1498 } 1499 bytes = frames * ep->stride; 1500 1501 if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE && 1502 subs->cur_audiofmt->dsd_dop)) { 1503 fill_playback_urb_dsd_dop(subs, urb, bytes); 1504 } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 && 1505 subs->cur_audiofmt->dsd_bitrev)) { 1506 /* bit-reverse the bytes */ 1507 u8 *buf = urb->transfer_buffer; 1508 for (i = 0; i < bytes; i++) { 1509 int idx = (subs->hwptr_done + i) 1510 % (runtime->buffer_size * stride); 1511 buf[i] = bitrev8(runtime->dma_area[idx]); 1512 } 1513 1514 subs->hwptr_done += bytes; 1515 if (subs->hwptr_done >= runtime->buffer_size * stride) 1516 subs->hwptr_done -= runtime->buffer_size * stride; 1517 } else { 1518 /* usual PCM */ 1519 if (!subs->tx_length_quirk) 1520 copy_to_urb(subs, urb, 0, stride, bytes); 1521 else 1522 bytes = copy_to_urb_quirk(subs, urb, stride, bytes); 1523 /* bytes is now amount of outgoing data */ 1524 } 1525 1526 /* update delay with exact number of samples queued */ 1527 runtime->delay = subs->last_delay; 1528 runtime->delay += frames; 1529 subs->last_delay = runtime->delay; 1530 1531 /* realign last_frame_number */ 1532 subs->last_frame_number = usb_get_current_frame_number(subs->dev); 1533 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */ 1534 1535 if (subs->trigger_tstamp_pending_update) { 1536 /* this is the first actual URB submitted, 1537 * update trigger timestamp to reflect actual start time 1538 */ 1539 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 1540 subs->trigger_tstamp_pending_update = false; 1541 } 1542 1543 spin_unlock_irqrestore(&subs->lock, flags); 1544 urb->transfer_buffer_length = bytes; 1545 if (period_elapsed) 1546 snd_pcm_period_elapsed(subs->pcm_substream); 1547 } 1548 1549 /* 1550 * process after playback data complete 1551 * - decrease the delay count again 1552 */ 1553 static void retire_playback_urb(struct snd_usb_substream *subs, 1554 struct urb *urb) 1555 { 1556 unsigned long flags; 1557 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1558 struct snd_usb_endpoint *ep = subs->data_endpoint; 1559 int processed = urb->transfer_buffer_length / ep->stride; 1560 int est_delay; 1561 1562 /* ignore the delay accounting when procssed=0 is given, i.e. 1563 * silent payloads are procssed before handling the actual data 1564 */ 1565 if (!processed) 1566 return; 1567 1568 spin_lock_irqsave(&subs->lock, flags); 1569 if (!subs->last_delay) 1570 goto out; /* short path */ 1571 1572 est_delay = snd_usb_pcm_delay(subs, runtime->rate); 1573 /* update delay with exact number of samples played */ 1574 if (processed > subs->last_delay) 1575 subs->last_delay = 0; 1576 else 1577 subs->last_delay -= processed; 1578 runtime->delay = subs->last_delay; 1579 1580 /* 1581 * Report when delay estimate is off by more than 2ms. 1582 * The error should be lower than 2ms since the estimate relies 1583 * on two reads of a counter updated every ms. 1584 */ 1585 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2) 1586 dev_dbg_ratelimited(&subs->dev->dev, 1587 "delay: estimated %d, actual %d\n", 1588 est_delay, subs->last_delay); 1589 1590 if (!subs->running) { 1591 /* update last_frame_number for delay counting here since 1592 * prepare_playback_urb won't be called during pause 1593 */ 1594 subs->last_frame_number = 1595 usb_get_current_frame_number(subs->dev) & 0xff; 1596 } 1597 1598 out: 1599 spin_unlock_irqrestore(&subs->lock, flags); 1600 } 1601 1602 static int snd_usb_playback_open(struct snd_pcm_substream *substream) 1603 { 1604 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK); 1605 } 1606 1607 static int snd_usb_playback_close(struct snd_pcm_substream *substream) 1608 { 1609 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK); 1610 } 1611 1612 static int snd_usb_capture_open(struct snd_pcm_substream *substream) 1613 { 1614 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE); 1615 } 1616 1617 static int snd_usb_capture_close(struct snd_pcm_substream *substream) 1618 { 1619 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE); 1620 } 1621 1622 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream, 1623 int cmd) 1624 { 1625 struct snd_usb_substream *subs = substream->runtime->private_data; 1626 1627 switch (cmd) { 1628 case SNDRV_PCM_TRIGGER_START: 1629 subs->trigger_tstamp_pending_update = true; 1630 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 1631 subs->data_endpoint->prepare_data_urb = prepare_playback_urb; 1632 subs->data_endpoint->retire_data_urb = retire_playback_urb; 1633 subs->running = 1; 1634 return 0; 1635 case SNDRV_PCM_TRIGGER_STOP: 1636 stop_endpoints(subs, false); 1637 subs->running = 0; 1638 return 0; 1639 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 1640 subs->data_endpoint->prepare_data_urb = NULL; 1641 /* keep retire_data_urb for delay calculation */ 1642 subs->data_endpoint->retire_data_urb = retire_playback_urb; 1643 subs->running = 0; 1644 return 0; 1645 } 1646 1647 return -EINVAL; 1648 } 1649 1650 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream, 1651 int cmd) 1652 { 1653 int err; 1654 struct snd_usb_substream *subs = substream->runtime->private_data; 1655 1656 switch (cmd) { 1657 case SNDRV_PCM_TRIGGER_START: 1658 err = start_endpoints(subs, false); 1659 if (err < 0) 1660 return err; 1661 1662 subs->data_endpoint->retire_data_urb = retire_capture_urb; 1663 subs->running = 1; 1664 return 0; 1665 case SNDRV_PCM_TRIGGER_STOP: 1666 stop_endpoints(subs, false); 1667 subs->running = 0; 1668 return 0; 1669 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 1670 subs->data_endpoint->retire_data_urb = NULL; 1671 subs->running = 0; 1672 return 0; 1673 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 1674 subs->data_endpoint->retire_data_urb = retire_capture_urb; 1675 subs->running = 1; 1676 return 0; 1677 } 1678 1679 return -EINVAL; 1680 } 1681 1682 static struct snd_pcm_ops snd_usb_playback_ops = { 1683 .open = snd_usb_playback_open, 1684 .close = snd_usb_playback_close, 1685 .ioctl = snd_pcm_lib_ioctl, 1686 .hw_params = snd_usb_hw_params, 1687 .hw_free = snd_usb_hw_free, 1688 .prepare = snd_usb_pcm_prepare, 1689 .trigger = snd_usb_substream_playback_trigger, 1690 .pointer = snd_usb_pcm_pointer, 1691 .page = snd_pcm_lib_get_vmalloc_page, 1692 .mmap = snd_pcm_lib_mmap_vmalloc, 1693 }; 1694 1695 static struct snd_pcm_ops snd_usb_capture_ops = { 1696 .open = snd_usb_capture_open, 1697 .close = snd_usb_capture_close, 1698 .ioctl = snd_pcm_lib_ioctl, 1699 .hw_params = snd_usb_hw_params, 1700 .hw_free = snd_usb_hw_free, 1701 .prepare = snd_usb_pcm_prepare, 1702 .trigger = snd_usb_substream_capture_trigger, 1703 .pointer = snd_usb_pcm_pointer, 1704 .page = snd_pcm_lib_get_vmalloc_page, 1705 .mmap = snd_pcm_lib_mmap_vmalloc, 1706 }; 1707 1708 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream) 1709 { 1710 snd_pcm_set_ops(pcm, stream, 1711 stream == SNDRV_PCM_STREAM_PLAYBACK ? 1712 &snd_usb_playback_ops : &snd_usb_capture_ops); 1713 } 1714