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