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