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) 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); 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); 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 case USB_ID(0x2466, 0x8003): 352 ep = 0x86; 353 iface = usb_ifnum_to_if(dev, 2); 354 355 if (!iface || iface->num_altsetting == 0) 356 return -EINVAL; 357 358 alts = &iface->altsetting[1]; 359 goto add_sync_ep; 360 361 } 362 if (attr == USB_ENDPOINT_SYNC_ASYNC && 363 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC && 364 altsd->bInterfaceProtocol == 2 && 365 altsd->bNumEndpoints == 1 && 366 USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ && 367 search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1, 368 altsd->bAlternateSetting, 369 &alts, &ep) >= 0) { 370 goto add_sync_ep; 371 } 372 373 /* No quirk */ 374 return 0; 375 376 add_sync_ep: 377 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip, 378 alts, ep, !subs->direction, 379 SND_USB_ENDPOINT_TYPE_DATA); 380 if (!subs->sync_endpoint) 381 return -EINVAL; 382 383 subs->data_endpoint->sync_master = subs->sync_endpoint; 384 385 return 0; 386 } 387 388 static int set_sync_endpoint(struct snd_usb_substream *subs, 389 struct audioformat *fmt, 390 struct usb_device *dev, 391 struct usb_host_interface *alts, 392 struct usb_interface_descriptor *altsd) 393 { 394 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK; 395 unsigned int ep, attr; 396 bool implicit_fb; 397 int err; 398 399 /* we need a sync pipe in async OUT or adaptive IN mode */ 400 /* check the number of EP, since some devices have broken 401 * descriptors which fool us. if it has only one EP, 402 * assume it as adaptive-out or sync-in. 403 */ 404 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE; 405 406 if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) || 407 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) { 408 409 /* 410 * In these modes the notion of sync_endpoint is irrelevant. 411 * Reset pointers to avoid using stale data from previously 412 * used settings, e.g. when configuration and endpoints were 413 * changed 414 */ 415 416 subs->sync_endpoint = NULL; 417 subs->data_endpoint->sync_master = NULL; 418 } 419 420 err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr); 421 if (err < 0) 422 return err; 423 424 if (altsd->bNumEndpoints < 2) 425 return 0; 426 427 if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC || 428 attr == USB_ENDPOINT_SYNC_ADAPTIVE)) || 429 (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE)) 430 return 0; 431 432 /* 433 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see 434 * if we don't find a sync endpoint, as on M-Audio Transit. In case of 435 * error fall back to SYNC mode and don't create sync endpoint 436 */ 437 438 /* check sync-pipe endpoint */ 439 /* ... and check descriptor size before accessing bSynchAddress 440 because there is a version of the SB Audigy 2 NX firmware lacking 441 the audio fields in the endpoint descriptors */ 442 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC || 443 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE && 444 get_endpoint(alts, 1)->bSynchAddress != 0)) { 445 dev_err(&dev->dev, 446 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n", 447 fmt->iface, fmt->altsetting, 448 get_endpoint(alts, 1)->bmAttributes, 449 get_endpoint(alts, 1)->bLength, 450 get_endpoint(alts, 1)->bSynchAddress); 451 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE) 452 return 0; 453 return -EINVAL; 454 } 455 ep = get_endpoint(alts, 1)->bEndpointAddress; 456 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE && 457 ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) || 458 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) { 459 dev_err(&dev->dev, 460 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n", 461 fmt->iface, fmt->altsetting, 462 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress); 463 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE) 464 return 0; 465 return -EINVAL; 466 } 467 468 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK) 469 == USB_ENDPOINT_USAGE_IMPLICIT_FB; 470 471 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip, 472 alts, ep, !subs->direction, 473 implicit_fb ? 474 SND_USB_ENDPOINT_TYPE_DATA : 475 SND_USB_ENDPOINT_TYPE_SYNC); 476 if (!subs->sync_endpoint) { 477 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE) 478 return 0; 479 return -EINVAL; 480 } 481 482 subs->data_endpoint->sync_master = subs->sync_endpoint; 483 484 return 0; 485 } 486 487 /* 488 * find a matching format and set up the interface 489 */ 490 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt) 491 { 492 struct usb_device *dev = subs->dev; 493 struct usb_host_interface *alts; 494 struct usb_interface_descriptor *altsd; 495 struct usb_interface *iface; 496 int err; 497 498 iface = usb_ifnum_to_if(dev, fmt->iface); 499 if (WARN_ON(!iface)) 500 return -EINVAL; 501 alts = &iface->altsetting[fmt->altset_idx]; 502 altsd = get_iface_desc(alts); 503 if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting)) 504 return -EINVAL; 505 506 if (fmt == subs->cur_audiofmt) 507 return 0; 508 509 /* close the old interface */ 510 if (subs->interface >= 0 && subs->interface != fmt->iface) { 511 err = usb_set_interface(subs->dev, subs->interface, 0); 512 if (err < 0) { 513 dev_err(&dev->dev, 514 "%d:%d: return to setting 0 failed (%d)\n", 515 fmt->iface, fmt->altsetting, err); 516 return -EIO; 517 } 518 subs->interface = -1; 519 subs->altset_idx = 0; 520 } 521 522 /* set interface */ 523 if (subs->interface != fmt->iface || 524 subs->altset_idx != fmt->altset_idx) { 525 526 err = snd_usb_select_mode_quirk(subs, fmt); 527 if (err < 0) 528 return -EIO; 529 530 err = usb_set_interface(dev, fmt->iface, fmt->altsetting); 531 if (err < 0) { 532 dev_err(&dev->dev, 533 "%d:%d: usb_set_interface failed (%d)\n", 534 fmt->iface, fmt->altsetting, err); 535 return -EIO; 536 } 537 dev_dbg(&dev->dev, "setting usb interface %d:%d\n", 538 fmt->iface, fmt->altsetting); 539 subs->interface = fmt->iface; 540 subs->altset_idx = fmt->altset_idx; 541 542 snd_usb_set_interface_quirk(dev); 543 } 544 545 subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip, 546 alts, fmt->endpoint, subs->direction, 547 SND_USB_ENDPOINT_TYPE_DATA); 548 549 if (!subs->data_endpoint) 550 return -EINVAL; 551 552 err = set_sync_endpoint(subs, fmt, dev, alts, altsd); 553 if (err < 0) 554 return err; 555 556 err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt); 557 if (err < 0) 558 return err; 559 560 subs->cur_audiofmt = fmt; 561 562 snd_usb_set_format_quirk(subs, fmt); 563 564 return 0; 565 } 566 567 /* 568 * Return the score of matching two audioformats. 569 * Veto the audioformat if: 570 * - It has no channels for some reason. 571 * - Requested PCM format is not supported. 572 * - Requested sample rate is not supported. 573 */ 574 static int match_endpoint_audioformats(struct snd_usb_substream *subs, 575 struct audioformat *fp, 576 struct audioformat *match, int rate, 577 snd_pcm_format_t pcm_format) 578 { 579 int i; 580 int score = 0; 581 582 if (fp->channels < 1) { 583 dev_dbg(&subs->dev->dev, 584 "%s: (fmt @%p) no channels\n", __func__, fp); 585 return 0; 586 } 587 588 if (!(fp->formats & pcm_format_to_bits(pcm_format))) { 589 dev_dbg(&subs->dev->dev, 590 "%s: (fmt @%p) no match for format %d\n", __func__, 591 fp, pcm_format); 592 return 0; 593 } 594 595 for (i = 0; i < fp->nr_rates; i++) { 596 if (fp->rate_table[i] == rate) { 597 score++; 598 break; 599 } 600 } 601 if (!score) { 602 dev_dbg(&subs->dev->dev, 603 "%s: (fmt @%p) no match for rate %d\n", __func__, 604 fp, rate); 605 return 0; 606 } 607 608 if (fp->channels == match->channels) 609 score++; 610 611 dev_dbg(&subs->dev->dev, 612 "%s: (fmt @%p) score %d\n", __func__, fp, score); 613 614 return score; 615 } 616 617 /* 618 * Configure the sync ep using the rate and pcm format of the data ep. 619 */ 620 static int configure_sync_endpoint(struct snd_usb_substream *subs) 621 { 622 int ret; 623 struct audioformat *fp; 624 struct audioformat *sync_fp = NULL; 625 int cur_score = 0; 626 int sync_period_bytes = subs->period_bytes; 627 struct snd_usb_substream *sync_subs = 628 &subs->stream->substream[subs->direction ^ 1]; 629 630 if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA || 631 !subs->stream) 632 return snd_usb_endpoint_set_params(subs->sync_endpoint, 633 subs->pcm_format, 634 subs->channels, 635 subs->period_bytes, 636 0, 0, 637 subs->cur_rate, 638 subs->cur_audiofmt, 639 NULL); 640 641 /* Try to find the best matching audioformat. */ 642 list_for_each_entry(fp, &sync_subs->fmt_list, list) { 643 int score = match_endpoint_audioformats(subs, 644 fp, subs->cur_audiofmt, 645 subs->cur_rate, subs->pcm_format); 646 647 if (score > cur_score) { 648 sync_fp = fp; 649 cur_score = score; 650 } 651 } 652 653 if (unlikely(sync_fp == NULL)) { 654 dev_err(&subs->dev->dev, 655 "%s: no valid audioformat for sync ep %x found\n", 656 __func__, sync_subs->ep_num); 657 return -EINVAL; 658 } 659 660 /* 661 * Recalculate the period bytes if channel number differ between 662 * data and sync ep audioformat. 663 */ 664 if (sync_fp->channels != subs->channels) { 665 sync_period_bytes = (subs->period_bytes / subs->channels) * 666 sync_fp->channels; 667 dev_dbg(&subs->dev->dev, 668 "%s: adjusted sync ep period bytes (%d -> %d)\n", 669 __func__, subs->period_bytes, sync_period_bytes); 670 } 671 672 ret = snd_usb_endpoint_set_params(subs->sync_endpoint, 673 subs->pcm_format, 674 sync_fp->channels, 675 sync_period_bytes, 676 0, 0, 677 subs->cur_rate, 678 sync_fp, 679 NULL); 680 681 return ret; 682 } 683 684 /* 685 * configure endpoint params 686 * 687 * called during initial setup and upon resume 688 */ 689 static int configure_endpoint(struct snd_usb_substream *subs) 690 { 691 int ret; 692 693 /* format changed */ 694 stop_endpoints(subs, true); 695 ret = snd_usb_endpoint_set_params(subs->data_endpoint, 696 subs->pcm_format, 697 subs->channels, 698 subs->period_bytes, 699 subs->period_frames, 700 subs->buffer_periods, 701 subs->cur_rate, 702 subs->cur_audiofmt, 703 subs->sync_endpoint); 704 if (ret < 0) 705 return ret; 706 707 if (subs->sync_endpoint) 708 ret = configure_sync_endpoint(subs); 709 710 return ret; 711 } 712 713 /* 714 * hw_params callback 715 * 716 * allocate a buffer and set the given audio format. 717 * 718 * so far we use a physically linear buffer although packetize transfer 719 * doesn't need a continuous area. 720 * if sg buffer is supported on the later version of alsa, we'll follow 721 * that. 722 */ 723 static int snd_usb_hw_params(struct snd_pcm_substream *substream, 724 struct snd_pcm_hw_params *hw_params) 725 { 726 struct snd_usb_substream *subs = substream->runtime->private_data; 727 struct audioformat *fmt; 728 int ret; 729 730 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream, 731 params_buffer_bytes(hw_params)); 732 if (ret < 0) 733 return ret; 734 735 subs->pcm_format = params_format(hw_params); 736 subs->period_bytes = params_period_bytes(hw_params); 737 subs->period_frames = params_period_size(hw_params); 738 subs->buffer_periods = params_periods(hw_params); 739 subs->channels = params_channels(hw_params); 740 subs->cur_rate = params_rate(hw_params); 741 742 fmt = find_format(subs); 743 if (!fmt) { 744 dev_dbg(&subs->dev->dev, 745 "cannot set format: format = %#x, rate = %d, channels = %d\n", 746 subs->pcm_format, subs->cur_rate, subs->channels); 747 return -EINVAL; 748 } 749 750 ret = snd_usb_lock_shutdown(subs->stream->chip); 751 if (ret < 0) 752 return ret; 753 ret = set_format(subs, fmt); 754 snd_usb_unlock_shutdown(subs->stream->chip); 755 if (ret < 0) 756 return ret; 757 758 subs->interface = fmt->iface; 759 subs->altset_idx = fmt->altset_idx; 760 subs->need_setup_ep = true; 761 762 return 0; 763 } 764 765 /* 766 * hw_free callback 767 * 768 * reset the audio format and release the buffer 769 */ 770 static int snd_usb_hw_free(struct snd_pcm_substream *substream) 771 { 772 struct snd_usb_substream *subs = substream->runtime->private_data; 773 774 subs->cur_audiofmt = NULL; 775 subs->cur_rate = 0; 776 subs->period_bytes = 0; 777 if (!snd_usb_lock_shutdown(subs->stream->chip)) { 778 stop_endpoints(subs, true); 779 snd_usb_endpoint_deactivate(subs->sync_endpoint); 780 snd_usb_endpoint_deactivate(subs->data_endpoint); 781 snd_usb_unlock_shutdown(subs->stream->chip); 782 } 783 return snd_pcm_lib_free_vmalloc_buffer(substream); 784 } 785 786 /* 787 * prepare callback 788 * 789 * only a few subtle things... 790 */ 791 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream) 792 { 793 struct snd_pcm_runtime *runtime = substream->runtime; 794 struct snd_usb_substream *subs = runtime->private_data; 795 struct usb_host_interface *alts; 796 struct usb_interface *iface; 797 int ret; 798 799 if (! subs->cur_audiofmt) { 800 dev_err(&subs->dev->dev, "no format is specified!\n"); 801 return -ENXIO; 802 } 803 804 ret = snd_usb_lock_shutdown(subs->stream->chip); 805 if (ret < 0) 806 return ret; 807 if (snd_BUG_ON(!subs->data_endpoint)) { 808 ret = -EIO; 809 goto unlock; 810 } 811 812 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint); 813 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint); 814 815 ret = set_format(subs, subs->cur_audiofmt); 816 if (ret < 0) 817 goto unlock; 818 819 if (subs->need_setup_ep) { 820 821 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface); 822 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx]; 823 ret = snd_usb_init_sample_rate(subs->stream->chip, 824 subs->cur_audiofmt->iface, 825 alts, 826 subs->cur_audiofmt, 827 subs->cur_rate); 828 if (ret < 0) 829 goto unlock; 830 831 ret = configure_endpoint(subs); 832 if (ret < 0) 833 goto unlock; 834 subs->need_setup_ep = false; 835 } 836 837 /* some unit conversions in runtime */ 838 subs->data_endpoint->maxframesize = 839 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize); 840 subs->data_endpoint->curframesize = 841 bytes_to_frames(runtime, subs->data_endpoint->curpacksize); 842 843 /* reset the pointer */ 844 subs->hwptr_done = 0; 845 subs->transfer_done = 0; 846 subs->last_delay = 0; 847 subs->last_frame_number = 0; 848 runtime->delay = 0; 849 850 /* for playback, submit the URBs now; otherwise, the first hwptr_done 851 * updates for all URBs would happen at the same time when starting */ 852 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) 853 ret = start_endpoints(subs); 854 855 unlock: 856 snd_usb_unlock_shutdown(subs->stream->chip); 857 return ret; 858 } 859 860 static const struct snd_pcm_hardware snd_usb_hardware = 861 { 862 .info = SNDRV_PCM_INFO_MMAP | 863 SNDRV_PCM_INFO_MMAP_VALID | 864 SNDRV_PCM_INFO_BATCH | 865 SNDRV_PCM_INFO_INTERLEAVED | 866 SNDRV_PCM_INFO_BLOCK_TRANSFER | 867 SNDRV_PCM_INFO_PAUSE, 868 .buffer_bytes_max = 1024 * 1024, 869 .period_bytes_min = 64, 870 .period_bytes_max = 512 * 1024, 871 .periods_min = 2, 872 .periods_max = 1024, 873 }; 874 875 static int hw_check_valid_format(struct snd_usb_substream *subs, 876 struct snd_pcm_hw_params *params, 877 struct audioformat *fp) 878 { 879 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 880 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 881 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 882 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME); 883 struct snd_mask check_fmts; 884 unsigned int ptime; 885 886 /* check the format */ 887 snd_mask_none(&check_fmts); 888 check_fmts.bits[0] = (u32)fp->formats; 889 check_fmts.bits[1] = (u32)(fp->formats >> 32); 890 snd_mask_intersect(&check_fmts, fmts); 891 if (snd_mask_empty(&check_fmts)) { 892 hwc_debug(" > check: no supported format %d\n", fp->format); 893 return 0; 894 } 895 /* check the channels */ 896 if (fp->channels < ct->min || fp->channels > ct->max) { 897 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max); 898 return 0; 899 } 900 /* check the rate is within the range */ 901 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) { 902 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max); 903 return 0; 904 } 905 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) { 906 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min); 907 return 0; 908 } 909 /* check whether the period time is >= the data packet interval */ 910 if (subs->speed != USB_SPEED_FULL) { 911 ptime = 125 * (1 << fp->datainterval); 912 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) { 913 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max); 914 return 0; 915 } 916 } 917 return 1; 918 } 919 920 static int hw_rule_rate(struct snd_pcm_hw_params *params, 921 struct snd_pcm_hw_rule *rule) 922 { 923 struct snd_usb_substream *subs = rule->private; 924 struct audioformat *fp; 925 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 926 unsigned int rmin, rmax; 927 int changed; 928 929 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max); 930 changed = 0; 931 rmin = rmax = 0; 932 list_for_each_entry(fp, &subs->fmt_list, list) { 933 if (!hw_check_valid_format(subs, params, fp)) 934 continue; 935 if (changed++) { 936 if (rmin > fp->rate_min) 937 rmin = fp->rate_min; 938 if (rmax < fp->rate_max) 939 rmax = fp->rate_max; 940 } else { 941 rmin = fp->rate_min; 942 rmax = fp->rate_max; 943 } 944 } 945 946 if (!changed) { 947 hwc_debug(" --> get empty\n"); 948 it->empty = 1; 949 return -EINVAL; 950 } 951 952 changed = 0; 953 if (it->min < rmin) { 954 it->min = rmin; 955 it->openmin = 0; 956 changed = 1; 957 } 958 if (it->max > rmax) { 959 it->max = rmax; 960 it->openmax = 0; 961 changed = 1; 962 } 963 if (snd_interval_checkempty(it)) { 964 it->empty = 1; 965 return -EINVAL; 966 } 967 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed); 968 return changed; 969 } 970 971 972 static int hw_rule_channels(struct snd_pcm_hw_params *params, 973 struct snd_pcm_hw_rule *rule) 974 { 975 struct snd_usb_substream *subs = rule->private; 976 struct audioformat *fp; 977 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 978 unsigned int rmin, rmax; 979 int changed; 980 981 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max); 982 changed = 0; 983 rmin = rmax = 0; 984 list_for_each_entry(fp, &subs->fmt_list, list) { 985 if (!hw_check_valid_format(subs, params, fp)) 986 continue; 987 if (changed++) { 988 if (rmin > fp->channels) 989 rmin = fp->channels; 990 if (rmax < fp->channels) 991 rmax = fp->channels; 992 } else { 993 rmin = fp->channels; 994 rmax = fp->channels; 995 } 996 } 997 998 if (!changed) { 999 hwc_debug(" --> get empty\n"); 1000 it->empty = 1; 1001 return -EINVAL; 1002 } 1003 1004 changed = 0; 1005 if (it->min < rmin) { 1006 it->min = rmin; 1007 it->openmin = 0; 1008 changed = 1; 1009 } 1010 if (it->max > rmax) { 1011 it->max = rmax; 1012 it->openmax = 0; 1013 changed = 1; 1014 } 1015 if (snd_interval_checkempty(it)) { 1016 it->empty = 1; 1017 return -EINVAL; 1018 } 1019 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed); 1020 return changed; 1021 } 1022 1023 static int hw_rule_format(struct snd_pcm_hw_params *params, 1024 struct snd_pcm_hw_rule *rule) 1025 { 1026 struct snd_usb_substream *subs = rule->private; 1027 struct audioformat *fp; 1028 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 1029 u64 fbits; 1030 u32 oldbits[2]; 1031 int changed; 1032 1033 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]); 1034 fbits = 0; 1035 list_for_each_entry(fp, &subs->fmt_list, list) { 1036 if (!hw_check_valid_format(subs, params, fp)) 1037 continue; 1038 fbits |= fp->formats; 1039 } 1040 1041 oldbits[0] = fmt->bits[0]; 1042 oldbits[1] = fmt->bits[1]; 1043 fmt->bits[0] &= (u32)fbits; 1044 fmt->bits[1] &= (u32)(fbits >> 32); 1045 if (!fmt->bits[0] && !fmt->bits[1]) { 1046 hwc_debug(" --> get empty\n"); 1047 return -EINVAL; 1048 } 1049 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]); 1050 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed); 1051 return changed; 1052 } 1053 1054 static int hw_rule_period_time(struct snd_pcm_hw_params *params, 1055 struct snd_pcm_hw_rule *rule) 1056 { 1057 struct snd_usb_substream *subs = rule->private; 1058 struct audioformat *fp; 1059 struct snd_interval *it; 1060 unsigned char min_datainterval; 1061 unsigned int pmin; 1062 int changed; 1063 1064 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME); 1065 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max); 1066 min_datainterval = 0xff; 1067 list_for_each_entry(fp, &subs->fmt_list, list) { 1068 if (!hw_check_valid_format(subs, params, fp)) 1069 continue; 1070 min_datainterval = min(min_datainterval, fp->datainterval); 1071 } 1072 if (min_datainterval == 0xff) { 1073 hwc_debug(" --> get empty\n"); 1074 it->empty = 1; 1075 return -EINVAL; 1076 } 1077 pmin = 125 * (1 << min_datainterval); 1078 changed = 0; 1079 if (it->min < pmin) { 1080 it->min = pmin; 1081 it->openmin = 0; 1082 changed = 1; 1083 } 1084 if (snd_interval_checkempty(it)) { 1085 it->empty = 1; 1086 return -EINVAL; 1087 } 1088 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed); 1089 return changed; 1090 } 1091 1092 /* 1093 * If the device supports unusual bit rates, does the request meet these? 1094 */ 1095 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime, 1096 struct snd_usb_substream *subs) 1097 { 1098 struct audioformat *fp; 1099 int *rate_list; 1100 int count = 0, needs_knot = 0; 1101 int err; 1102 1103 kfree(subs->rate_list.list); 1104 subs->rate_list.list = NULL; 1105 1106 list_for_each_entry(fp, &subs->fmt_list, list) { 1107 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS) 1108 return 0; 1109 count += fp->nr_rates; 1110 if (fp->rates & SNDRV_PCM_RATE_KNOT) 1111 needs_knot = 1; 1112 } 1113 if (!needs_knot) 1114 return 0; 1115 1116 subs->rate_list.list = rate_list = 1117 kmalloc(sizeof(int) * count, GFP_KERNEL); 1118 if (!subs->rate_list.list) 1119 return -ENOMEM; 1120 subs->rate_list.count = count; 1121 subs->rate_list.mask = 0; 1122 count = 0; 1123 list_for_each_entry(fp, &subs->fmt_list, list) { 1124 int i; 1125 for (i = 0; i < fp->nr_rates; i++) 1126 rate_list[count++] = fp->rate_table[i]; 1127 } 1128 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1129 &subs->rate_list); 1130 if (err < 0) 1131 return err; 1132 1133 return 0; 1134 } 1135 1136 1137 /* 1138 * set up the runtime hardware information. 1139 */ 1140 1141 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs) 1142 { 1143 struct audioformat *fp; 1144 unsigned int pt, ptmin; 1145 int param_period_time_if_needed; 1146 int err; 1147 1148 runtime->hw.formats = subs->formats; 1149 1150 runtime->hw.rate_min = 0x7fffffff; 1151 runtime->hw.rate_max = 0; 1152 runtime->hw.channels_min = 256; 1153 runtime->hw.channels_max = 0; 1154 runtime->hw.rates = 0; 1155 ptmin = UINT_MAX; 1156 /* check min/max rates and channels */ 1157 list_for_each_entry(fp, &subs->fmt_list, list) { 1158 runtime->hw.rates |= fp->rates; 1159 if (runtime->hw.rate_min > fp->rate_min) 1160 runtime->hw.rate_min = fp->rate_min; 1161 if (runtime->hw.rate_max < fp->rate_max) 1162 runtime->hw.rate_max = fp->rate_max; 1163 if (runtime->hw.channels_min > fp->channels) 1164 runtime->hw.channels_min = fp->channels; 1165 if (runtime->hw.channels_max < fp->channels) 1166 runtime->hw.channels_max = fp->channels; 1167 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) { 1168 /* FIXME: there might be more than one audio formats... */ 1169 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max = 1170 fp->frame_size; 1171 } 1172 pt = 125 * (1 << fp->datainterval); 1173 ptmin = min(ptmin, pt); 1174 } 1175 err = snd_usb_autoresume(subs->stream->chip); 1176 if (err < 0) 1177 return err; 1178 1179 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME; 1180 if (subs->speed == USB_SPEED_FULL) 1181 /* full speed devices have fixed data packet interval */ 1182 ptmin = 1000; 1183 if (ptmin == 1000) 1184 /* if period time doesn't go below 1 ms, no rules needed */ 1185 param_period_time_if_needed = -1; 1186 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1187 ptmin, UINT_MAX); 1188 1189 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1190 hw_rule_rate, subs, 1191 SNDRV_PCM_HW_PARAM_FORMAT, 1192 SNDRV_PCM_HW_PARAM_CHANNELS, 1193 param_period_time_if_needed, 1194 -1)) < 0) 1195 goto rep_err; 1196 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 1197 hw_rule_channels, subs, 1198 SNDRV_PCM_HW_PARAM_FORMAT, 1199 SNDRV_PCM_HW_PARAM_RATE, 1200 param_period_time_if_needed, 1201 -1)) < 0) 1202 goto rep_err; 1203 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 1204 hw_rule_format, subs, 1205 SNDRV_PCM_HW_PARAM_RATE, 1206 SNDRV_PCM_HW_PARAM_CHANNELS, 1207 param_period_time_if_needed, 1208 -1)) < 0) 1209 goto rep_err; 1210 if (param_period_time_if_needed >= 0) { 1211 err = snd_pcm_hw_rule_add(runtime, 0, 1212 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1213 hw_rule_period_time, subs, 1214 SNDRV_PCM_HW_PARAM_FORMAT, 1215 SNDRV_PCM_HW_PARAM_CHANNELS, 1216 SNDRV_PCM_HW_PARAM_RATE, 1217 -1); 1218 if (err < 0) 1219 goto rep_err; 1220 } 1221 if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0) 1222 goto rep_err; 1223 return 0; 1224 1225 rep_err: 1226 snd_usb_autosuspend(subs->stream->chip); 1227 return err; 1228 } 1229 1230 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction) 1231 { 1232 struct snd_usb_stream *as = snd_pcm_substream_chip(substream); 1233 struct snd_pcm_runtime *runtime = substream->runtime; 1234 struct snd_usb_substream *subs = &as->substream[direction]; 1235 1236 subs->interface = -1; 1237 subs->altset_idx = 0; 1238 runtime->hw = snd_usb_hardware; 1239 runtime->private_data = subs; 1240 subs->pcm_substream = substream; 1241 /* runtime PM is also done there */ 1242 1243 /* initialize DSD/DOP context */ 1244 subs->dsd_dop.byte_idx = 0; 1245 subs->dsd_dop.channel = 0; 1246 subs->dsd_dop.marker = 1; 1247 1248 return setup_hw_info(runtime, subs); 1249 } 1250 1251 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction) 1252 { 1253 struct snd_usb_stream *as = snd_pcm_substream_chip(substream); 1254 struct snd_usb_substream *subs = &as->substream[direction]; 1255 1256 stop_endpoints(subs, true); 1257 1258 if (subs->interface >= 0 && 1259 !snd_usb_lock_shutdown(subs->stream->chip)) { 1260 usb_set_interface(subs->dev, subs->interface, 0); 1261 subs->interface = -1; 1262 snd_usb_unlock_shutdown(subs->stream->chip); 1263 } 1264 1265 subs->pcm_substream = NULL; 1266 snd_usb_autosuspend(subs->stream->chip); 1267 1268 return 0; 1269 } 1270 1271 /* Since a URB can handle only a single linear buffer, we must use double 1272 * buffering when the data to be transferred overflows the buffer boundary. 1273 * To avoid inconsistencies when updating hwptr_done, we use double buffering 1274 * for all URBs. 1275 */ 1276 static void retire_capture_urb(struct snd_usb_substream *subs, 1277 struct urb *urb) 1278 { 1279 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1280 unsigned int stride, frames, bytes, oldptr; 1281 int i, period_elapsed = 0; 1282 unsigned long flags; 1283 unsigned char *cp; 1284 int current_frame_number; 1285 1286 /* read frame number here, update pointer in critical section */ 1287 current_frame_number = usb_get_current_frame_number(subs->dev); 1288 1289 stride = runtime->frame_bits >> 3; 1290 1291 for (i = 0; i < urb->number_of_packets; i++) { 1292 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj; 1293 if (urb->iso_frame_desc[i].status && printk_ratelimit()) { 1294 dev_dbg(&subs->dev->dev, "frame %d active: %d\n", 1295 i, urb->iso_frame_desc[i].status); 1296 // continue; 1297 } 1298 bytes = urb->iso_frame_desc[i].actual_length; 1299 frames = bytes / stride; 1300 if (!subs->txfr_quirk) 1301 bytes = frames * stride; 1302 if (bytes % (runtime->sample_bits >> 3) != 0) { 1303 int oldbytes = bytes; 1304 bytes = frames * stride; 1305 dev_warn(&subs->dev->dev, 1306 "Corrected urb data len. %d->%d\n", 1307 oldbytes, bytes); 1308 } 1309 /* update the current pointer */ 1310 spin_lock_irqsave(&subs->lock, flags); 1311 oldptr = subs->hwptr_done; 1312 subs->hwptr_done += bytes; 1313 if (subs->hwptr_done >= runtime->buffer_size * stride) 1314 subs->hwptr_done -= runtime->buffer_size * stride; 1315 frames = (bytes + (oldptr % stride)) / stride; 1316 subs->transfer_done += frames; 1317 if (subs->transfer_done >= runtime->period_size) { 1318 subs->transfer_done -= runtime->period_size; 1319 period_elapsed = 1; 1320 } 1321 /* capture delay is by construction limited to one URB, 1322 * reset delays here 1323 */ 1324 runtime->delay = subs->last_delay = 0; 1325 1326 /* realign last_frame_number */ 1327 subs->last_frame_number = current_frame_number; 1328 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */ 1329 1330 spin_unlock_irqrestore(&subs->lock, flags); 1331 /* copy a data chunk */ 1332 if (oldptr + bytes > runtime->buffer_size * stride) { 1333 unsigned int bytes1 = 1334 runtime->buffer_size * stride - oldptr; 1335 memcpy(runtime->dma_area + oldptr, cp, bytes1); 1336 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1); 1337 } else { 1338 memcpy(runtime->dma_area + oldptr, cp, bytes); 1339 } 1340 } 1341 1342 if (period_elapsed) 1343 snd_pcm_period_elapsed(subs->pcm_substream); 1344 } 1345 1346 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs, 1347 struct urb *urb, unsigned int bytes) 1348 { 1349 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1350 unsigned int stride = runtime->frame_bits >> 3; 1351 unsigned int dst_idx = 0; 1352 unsigned int src_idx = subs->hwptr_done; 1353 unsigned int wrap = runtime->buffer_size * stride; 1354 u8 *dst = urb->transfer_buffer; 1355 u8 *src = runtime->dma_area; 1356 u8 marker[] = { 0x05, 0xfa }; 1357 1358 /* 1359 * The DSP DOP format defines a way to transport DSD samples over 1360 * normal PCM data endpoints. It requires stuffing of marker bytes 1361 * (0x05 and 0xfa, alternating per sample frame), and then expects 1362 * 2 additional bytes of actual payload. The whole frame is stored 1363 * LSB. 1364 * 1365 * Hence, for a stereo transport, the buffer layout looks like this, 1366 * where L refers to left channel samples and R to right. 1367 * 1368 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa 1369 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa 1370 * ..... 1371 * 1372 */ 1373 1374 while (bytes--) { 1375 if (++subs->dsd_dop.byte_idx == 3) { 1376 /* frame boundary? */ 1377 dst[dst_idx++] = marker[subs->dsd_dop.marker]; 1378 src_idx += 2; 1379 subs->dsd_dop.byte_idx = 0; 1380 1381 if (++subs->dsd_dop.channel % runtime->channels == 0) { 1382 /* alternate the marker */ 1383 subs->dsd_dop.marker++; 1384 subs->dsd_dop.marker %= ARRAY_SIZE(marker); 1385 subs->dsd_dop.channel = 0; 1386 } 1387 } else { 1388 /* stuff the DSD payload */ 1389 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap; 1390 1391 if (subs->cur_audiofmt->dsd_bitrev) 1392 dst[dst_idx++] = bitrev8(src[idx]); 1393 else 1394 dst[dst_idx++] = src[idx]; 1395 1396 subs->hwptr_done++; 1397 } 1398 } 1399 if (subs->hwptr_done >= runtime->buffer_size * stride) 1400 subs->hwptr_done -= runtime->buffer_size * stride; 1401 } 1402 1403 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb, 1404 int offset, int stride, unsigned int bytes) 1405 { 1406 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1407 1408 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) { 1409 /* err, the transferred area goes over buffer boundary. */ 1410 unsigned int bytes1 = 1411 runtime->buffer_size * stride - subs->hwptr_done; 1412 memcpy(urb->transfer_buffer + offset, 1413 runtime->dma_area + subs->hwptr_done, bytes1); 1414 memcpy(urb->transfer_buffer + offset + bytes1, 1415 runtime->dma_area, bytes - bytes1); 1416 } else { 1417 memcpy(urb->transfer_buffer + offset, 1418 runtime->dma_area + subs->hwptr_done, bytes); 1419 } 1420 subs->hwptr_done += bytes; 1421 if (subs->hwptr_done >= runtime->buffer_size * stride) 1422 subs->hwptr_done -= runtime->buffer_size * stride; 1423 } 1424 1425 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs, 1426 struct urb *urb, int stride, 1427 unsigned int bytes) 1428 { 1429 __le32 packet_length; 1430 int i; 1431 1432 /* Put __le32 length descriptor at start of each packet. */ 1433 for (i = 0; i < urb->number_of_packets; i++) { 1434 unsigned int length = urb->iso_frame_desc[i].length; 1435 unsigned int offset = urb->iso_frame_desc[i].offset; 1436 1437 packet_length = cpu_to_le32(length); 1438 offset += i * sizeof(packet_length); 1439 urb->iso_frame_desc[i].offset = offset; 1440 urb->iso_frame_desc[i].length += sizeof(packet_length); 1441 memcpy(urb->transfer_buffer + offset, 1442 &packet_length, sizeof(packet_length)); 1443 copy_to_urb(subs, urb, offset + sizeof(packet_length), 1444 stride, length); 1445 } 1446 /* Adjust transfer size accordingly. */ 1447 bytes += urb->number_of_packets * sizeof(packet_length); 1448 return bytes; 1449 } 1450 1451 static void prepare_playback_urb(struct snd_usb_substream *subs, 1452 struct urb *urb) 1453 { 1454 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1455 struct snd_usb_endpoint *ep = subs->data_endpoint; 1456 struct snd_urb_ctx *ctx = urb->context; 1457 unsigned int counts, frames, bytes; 1458 int i, stride, period_elapsed = 0; 1459 unsigned long flags; 1460 1461 stride = runtime->frame_bits >> 3; 1462 1463 frames = 0; 1464 urb->number_of_packets = 0; 1465 spin_lock_irqsave(&subs->lock, flags); 1466 subs->frame_limit += ep->max_urb_frames; 1467 for (i = 0; i < ctx->packets; i++) { 1468 if (ctx->packet_size[i]) 1469 counts = ctx->packet_size[i]; 1470 else 1471 counts = snd_usb_endpoint_next_packet_size(ep); 1472 1473 /* set up descriptor */ 1474 urb->iso_frame_desc[i].offset = frames * ep->stride; 1475 urb->iso_frame_desc[i].length = counts * ep->stride; 1476 frames += counts; 1477 urb->number_of_packets++; 1478 subs->transfer_done += counts; 1479 if (subs->transfer_done >= runtime->period_size) { 1480 subs->transfer_done -= runtime->period_size; 1481 subs->frame_limit = 0; 1482 period_elapsed = 1; 1483 if (subs->fmt_type == UAC_FORMAT_TYPE_II) { 1484 if (subs->transfer_done > 0) { 1485 /* FIXME: fill-max mode is not 1486 * supported yet */ 1487 frames -= subs->transfer_done; 1488 counts -= subs->transfer_done; 1489 urb->iso_frame_desc[i].length = 1490 counts * ep->stride; 1491 subs->transfer_done = 0; 1492 } 1493 i++; 1494 if (i < ctx->packets) { 1495 /* add a transfer delimiter */ 1496 urb->iso_frame_desc[i].offset = 1497 frames * ep->stride; 1498 urb->iso_frame_desc[i].length = 0; 1499 urb->number_of_packets++; 1500 } 1501 break; 1502 } 1503 } 1504 /* finish at the period boundary or after enough frames */ 1505 if ((period_elapsed || 1506 subs->transfer_done >= subs->frame_limit) && 1507 !snd_usb_endpoint_implicit_feedback_sink(ep)) 1508 break; 1509 } 1510 bytes = frames * ep->stride; 1511 1512 if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE && 1513 subs->cur_audiofmt->dsd_dop)) { 1514 fill_playback_urb_dsd_dop(subs, urb, bytes); 1515 } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 && 1516 subs->cur_audiofmt->dsd_bitrev)) { 1517 /* bit-reverse the bytes */ 1518 u8 *buf = urb->transfer_buffer; 1519 for (i = 0; i < bytes; i++) { 1520 int idx = (subs->hwptr_done + i) 1521 % (runtime->buffer_size * stride); 1522 buf[i] = bitrev8(runtime->dma_area[idx]); 1523 } 1524 1525 subs->hwptr_done += bytes; 1526 if (subs->hwptr_done >= runtime->buffer_size * stride) 1527 subs->hwptr_done -= runtime->buffer_size * stride; 1528 } else { 1529 /* usual PCM */ 1530 if (!subs->tx_length_quirk) 1531 copy_to_urb(subs, urb, 0, stride, bytes); 1532 else 1533 bytes = copy_to_urb_quirk(subs, urb, stride, bytes); 1534 /* bytes is now amount of outgoing data */ 1535 } 1536 1537 /* update delay with exact number of samples queued */ 1538 runtime->delay = subs->last_delay; 1539 runtime->delay += frames; 1540 subs->last_delay = runtime->delay; 1541 1542 /* realign last_frame_number */ 1543 subs->last_frame_number = usb_get_current_frame_number(subs->dev); 1544 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */ 1545 1546 if (subs->trigger_tstamp_pending_update) { 1547 /* this is the first actual URB submitted, 1548 * update trigger timestamp to reflect actual start time 1549 */ 1550 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 1551 subs->trigger_tstamp_pending_update = false; 1552 } 1553 1554 spin_unlock_irqrestore(&subs->lock, flags); 1555 urb->transfer_buffer_length = bytes; 1556 if (period_elapsed) 1557 snd_pcm_period_elapsed(subs->pcm_substream); 1558 } 1559 1560 /* 1561 * process after playback data complete 1562 * - decrease the delay count again 1563 */ 1564 static void retire_playback_urb(struct snd_usb_substream *subs, 1565 struct urb *urb) 1566 { 1567 unsigned long flags; 1568 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1569 struct snd_usb_endpoint *ep = subs->data_endpoint; 1570 int processed = urb->transfer_buffer_length / ep->stride; 1571 int est_delay; 1572 1573 /* ignore the delay accounting when procssed=0 is given, i.e. 1574 * silent payloads are procssed before handling the actual data 1575 */ 1576 if (!processed) 1577 return; 1578 1579 spin_lock_irqsave(&subs->lock, flags); 1580 if (!subs->last_delay) 1581 goto out; /* short path */ 1582 1583 est_delay = snd_usb_pcm_delay(subs, runtime->rate); 1584 /* update delay with exact number of samples played */ 1585 if (processed > subs->last_delay) 1586 subs->last_delay = 0; 1587 else 1588 subs->last_delay -= processed; 1589 runtime->delay = subs->last_delay; 1590 1591 /* 1592 * Report when delay estimate is off by more than 2ms. 1593 * The error should be lower than 2ms since the estimate relies 1594 * on two reads of a counter updated every ms. 1595 */ 1596 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2) 1597 dev_dbg_ratelimited(&subs->dev->dev, 1598 "delay: estimated %d, actual %d\n", 1599 est_delay, subs->last_delay); 1600 1601 if (!subs->running) { 1602 /* update last_frame_number for delay counting here since 1603 * prepare_playback_urb won't be called during pause 1604 */ 1605 subs->last_frame_number = 1606 usb_get_current_frame_number(subs->dev) & 0xff; 1607 } 1608 1609 out: 1610 spin_unlock_irqrestore(&subs->lock, flags); 1611 } 1612 1613 static int snd_usb_playback_open(struct snd_pcm_substream *substream) 1614 { 1615 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK); 1616 } 1617 1618 static int snd_usb_playback_close(struct snd_pcm_substream *substream) 1619 { 1620 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK); 1621 } 1622 1623 static int snd_usb_capture_open(struct snd_pcm_substream *substream) 1624 { 1625 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE); 1626 } 1627 1628 static int snd_usb_capture_close(struct snd_pcm_substream *substream) 1629 { 1630 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE); 1631 } 1632 1633 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream, 1634 int cmd) 1635 { 1636 struct snd_usb_substream *subs = substream->runtime->private_data; 1637 1638 switch (cmd) { 1639 case SNDRV_PCM_TRIGGER_START: 1640 subs->trigger_tstamp_pending_update = true; 1641 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 1642 subs->data_endpoint->prepare_data_urb = prepare_playback_urb; 1643 subs->data_endpoint->retire_data_urb = retire_playback_urb; 1644 subs->running = 1; 1645 return 0; 1646 case SNDRV_PCM_TRIGGER_STOP: 1647 stop_endpoints(subs, false); 1648 subs->running = 0; 1649 return 0; 1650 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 1651 subs->data_endpoint->prepare_data_urb = NULL; 1652 /* keep retire_data_urb for delay calculation */ 1653 subs->data_endpoint->retire_data_urb = retire_playback_urb; 1654 subs->running = 0; 1655 return 0; 1656 } 1657 1658 return -EINVAL; 1659 } 1660 1661 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream, 1662 int cmd) 1663 { 1664 int err; 1665 struct snd_usb_substream *subs = substream->runtime->private_data; 1666 1667 switch (cmd) { 1668 case SNDRV_PCM_TRIGGER_START: 1669 err = start_endpoints(subs); 1670 if (err < 0) 1671 return err; 1672 1673 subs->data_endpoint->retire_data_urb = retire_capture_urb; 1674 subs->running = 1; 1675 return 0; 1676 case SNDRV_PCM_TRIGGER_STOP: 1677 stop_endpoints(subs, false); 1678 subs->running = 0; 1679 return 0; 1680 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 1681 subs->data_endpoint->retire_data_urb = NULL; 1682 subs->running = 0; 1683 return 0; 1684 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 1685 subs->data_endpoint->retire_data_urb = retire_capture_urb; 1686 subs->running = 1; 1687 return 0; 1688 } 1689 1690 return -EINVAL; 1691 } 1692 1693 static const struct snd_pcm_ops snd_usb_playback_ops = { 1694 .open = snd_usb_playback_open, 1695 .close = snd_usb_playback_close, 1696 .ioctl = snd_pcm_lib_ioctl, 1697 .hw_params = snd_usb_hw_params, 1698 .hw_free = snd_usb_hw_free, 1699 .prepare = snd_usb_pcm_prepare, 1700 .trigger = snd_usb_substream_playback_trigger, 1701 .pointer = snd_usb_pcm_pointer, 1702 .page = snd_pcm_lib_get_vmalloc_page, 1703 .mmap = snd_pcm_lib_mmap_vmalloc, 1704 }; 1705 1706 static const struct snd_pcm_ops snd_usb_capture_ops = { 1707 .open = snd_usb_capture_open, 1708 .close = snd_usb_capture_close, 1709 .ioctl = snd_pcm_lib_ioctl, 1710 .hw_params = snd_usb_hw_params, 1711 .hw_free = snd_usb_hw_free, 1712 .prepare = snd_usb_pcm_prepare, 1713 .trigger = snd_usb_substream_capture_trigger, 1714 .pointer = snd_usb_pcm_pointer, 1715 .page = snd_pcm_lib_get_vmalloc_page, 1716 .mmap = snd_pcm_lib_mmap_vmalloc, 1717 }; 1718 1719 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream) 1720 { 1721 snd_pcm_set_ops(pcm, stream, 1722 stream == SNDRV_PCM_STREAM_PLAYBACK ? 1723 &snd_usb_playback_ops : &snd_usb_capture_ops); 1724 } 1725