1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 */ 4 5 #include <linux/init.h> 6 #include <linux/slab.h> 7 #include <linux/bitrev.h> 8 #include <linux/ratelimit.h> 9 #include <linux/usb.h> 10 #include <linux/usb/audio.h> 11 #include <linux/usb/audio-v2.h> 12 13 #include <sound/core.h> 14 #include <sound/pcm.h> 15 #include <sound/pcm_params.h> 16 17 #include "usbaudio.h" 18 #include "card.h" 19 #include "quirks.h" 20 #include "debug.h" 21 #include "endpoint.h" 22 #include "helper.h" 23 #include "pcm.h" 24 #include "clock.h" 25 #include "power.h" 26 #include "media.h" 27 28 #define SUBSTREAM_FLAG_DATA_EP_STARTED 0 29 #define SUBSTREAM_FLAG_SYNC_EP_STARTED 1 30 31 /* return the estimated delay based on USB frame counters */ 32 snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs, 33 unsigned int rate) 34 { 35 int current_frame_number; 36 int frame_diff; 37 int est_delay; 38 39 if (!subs->last_delay) 40 return 0; /* short path */ 41 42 current_frame_number = usb_get_current_frame_number(subs->dev); 43 /* 44 * HCD implementations use different widths, use lower 8 bits. 45 * The delay will be managed up to 256ms, which is more than 46 * enough 47 */ 48 frame_diff = (current_frame_number - subs->last_frame_number) & 0xff; 49 50 /* Approximation based on number of samples per USB frame (ms), 51 some truncation for 44.1 but the estimate is good enough */ 52 est_delay = frame_diff * rate / 1000; 53 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) 54 est_delay = subs->last_delay - est_delay; 55 else 56 est_delay = subs->last_delay + est_delay; 57 58 if (est_delay < 0) 59 est_delay = 0; 60 return est_delay; 61 } 62 63 /* 64 * return the current pcm pointer. just based on the hwptr_done value. 65 */ 66 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream) 67 { 68 struct snd_usb_substream *subs = substream->runtime->private_data; 69 unsigned int hwptr_done; 70 71 if (atomic_read(&subs->stream->chip->shutdown)) 72 return SNDRV_PCM_POS_XRUN; 73 spin_lock(&subs->lock); 74 hwptr_done = subs->hwptr_done; 75 substream->runtime->delay = snd_usb_pcm_delay(subs, 76 substream->runtime->rate); 77 spin_unlock(&subs->lock); 78 return hwptr_done / (substream->runtime->frame_bits >> 3); 79 } 80 81 /* 82 * find a matching audio format 83 */ 84 static struct audioformat *find_format(struct snd_usb_substream *subs) 85 { 86 struct audioformat *fp; 87 struct audioformat *found = NULL; 88 int cur_attr = 0, attr; 89 90 list_for_each_entry(fp, &subs->fmt_list, list) { 91 if (!(fp->formats & pcm_format_to_bits(subs->pcm_format))) 92 continue; 93 if (fp->channels != subs->channels) 94 continue; 95 if (subs->cur_rate < fp->rate_min || 96 subs->cur_rate > fp->rate_max) 97 continue; 98 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) { 99 unsigned int i; 100 for (i = 0; i < fp->nr_rates; i++) 101 if (fp->rate_table[i] == subs->cur_rate) 102 break; 103 if (i >= fp->nr_rates) 104 continue; 105 } 106 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE; 107 if (! found) { 108 found = fp; 109 cur_attr = attr; 110 continue; 111 } 112 /* avoid async out and adaptive in if the other method 113 * supports the same format. 114 * this is a workaround for the case like 115 * M-audio audiophile USB. 116 */ 117 if (attr != cur_attr) { 118 if ((attr == USB_ENDPOINT_SYNC_ASYNC && 119 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) || 120 (attr == USB_ENDPOINT_SYNC_ADAPTIVE && 121 subs->direction == SNDRV_PCM_STREAM_CAPTURE)) 122 continue; 123 if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC && 124 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) || 125 (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE && 126 subs->direction == SNDRV_PCM_STREAM_CAPTURE)) { 127 found = fp; 128 cur_attr = attr; 129 continue; 130 } 131 } 132 /* find the format with the largest max. packet size */ 133 if (fp->maxpacksize > found->maxpacksize) { 134 found = fp; 135 cur_attr = attr; 136 } 137 } 138 return found; 139 } 140 141 static int init_pitch_v1(struct snd_usb_audio *chip, int iface, 142 struct usb_host_interface *alts, 143 struct audioformat *fmt) 144 { 145 struct usb_device *dev = chip->dev; 146 unsigned int ep; 147 unsigned char data[1]; 148 int err; 149 150 if (get_iface_desc(alts)->bNumEndpoints < 1) 151 return -EINVAL; 152 ep = get_endpoint(alts, 0)->bEndpointAddress; 153 154 data[0] = 1; 155 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR, 156 USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT, 157 UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep, 158 data, sizeof(data)); 159 if (err < 0) { 160 usb_audio_err(chip, "%d:%d: cannot set enable PITCH\n", 161 iface, ep); 162 return err; 163 } 164 165 return 0; 166 } 167 168 static int init_pitch_v2(struct snd_usb_audio *chip, int iface, 169 struct usb_host_interface *alts, 170 struct audioformat *fmt) 171 { 172 struct usb_device *dev = chip->dev; 173 unsigned char data[1]; 174 int err; 175 176 data[0] = 1; 177 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR, 178 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT, 179 UAC2_EP_CS_PITCH << 8, 0, 180 data, sizeof(data)); 181 if (err < 0) { 182 usb_audio_err(chip, "%d:%d: cannot set enable PITCH (v2)\n", 183 iface, fmt->altsetting); 184 return err; 185 } 186 187 return 0; 188 } 189 190 /* 191 * initialize the pitch control and sample rate 192 */ 193 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface, 194 struct usb_host_interface *alts, 195 struct audioformat *fmt) 196 { 197 /* if endpoint doesn't have pitch control, bail out */ 198 if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL)) 199 return 0; 200 201 switch (fmt->protocol) { 202 case UAC_VERSION_1: 203 default: 204 return init_pitch_v1(chip, iface, alts, fmt); 205 206 case UAC_VERSION_2: 207 return init_pitch_v2(chip, iface, alts, fmt); 208 } 209 } 210 211 static int start_endpoints(struct snd_usb_substream *subs) 212 { 213 int err; 214 215 if (!subs->data_endpoint) 216 return -EINVAL; 217 218 if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) { 219 struct snd_usb_endpoint *ep = subs->data_endpoint; 220 221 dev_dbg(&subs->dev->dev, "Starting data EP @%p\n", ep); 222 223 ep->data_subs = subs; 224 err = snd_usb_endpoint_start(ep); 225 if (err < 0) { 226 clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags); 227 return err; 228 } 229 } 230 231 if (subs->sync_endpoint && 232 !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) { 233 struct snd_usb_endpoint *ep = subs->sync_endpoint; 234 235 if (subs->data_endpoint->iface != subs->sync_endpoint->iface || 236 subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) { 237 err = usb_set_interface(subs->dev, 238 subs->sync_endpoint->iface, 239 subs->sync_endpoint->altsetting); 240 if (err < 0) { 241 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags); 242 dev_err(&subs->dev->dev, 243 "%d:%d: cannot set interface (%d)\n", 244 subs->sync_endpoint->iface, 245 subs->sync_endpoint->altsetting, err); 246 return -EIO; 247 } 248 } 249 250 dev_dbg(&subs->dev->dev, "Starting sync EP @%p\n", ep); 251 252 ep->sync_slave = subs->data_endpoint; 253 err = snd_usb_endpoint_start(ep); 254 if (err < 0) { 255 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags); 256 return err; 257 } 258 } 259 260 return 0; 261 } 262 263 static void stop_endpoints(struct snd_usb_substream *subs, bool wait) 264 { 265 if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) 266 snd_usb_endpoint_stop(subs->sync_endpoint); 267 268 if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) 269 snd_usb_endpoint_stop(subs->data_endpoint); 270 271 if (wait) { 272 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint); 273 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint); 274 } 275 } 276 277 static int search_roland_implicit_fb(struct usb_device *dev, int ifnum, 278 unsigned int altsetting, 279 struct usb_host_interface **alts, 280 unsigned int *ep) 281 { 282 struct usb_interface *iface; 283 struct usb_interface_descriptor *altsd; 284 struct usb_endpoint_descriptor *epd; 285 286 iface = usb_ifnum_to_if(dev, ifnum); 287 if (!iface || iface->num_altsetting < altsetting + 1) 288 return -ENOENT; 289 *alts = &iface->altsetting[altsetting]; 290 altsd = get_iface_desc(*alts); 291 if (altsd->bAlternateSetting != altsetting || 292 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC || 293 (altsd->bInterfaceSubClass != 2 && 294 altsd->bInterfaceProtocol != 2 ) || 295 altsd->bNumEndpoints < 1) 296 return -ENOENT; 297 epd = get_endpoint(*alts, 0); 298 if (!usb_endpoint_is_isoc_in(epd) || 299 (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) != 300 USB_ENDPOINT_USAGE_IMPLICIT_FB) 301 return -ENOENT; 302 *ep = epd->bEndpointAddress; 303 return 0; 304 } 305 306 /* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk 307 * applies. Returns 1 if a quirk was found. 308 */ 309 static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs, 310 struct usb_device *dev, 311 struct usb_interface_descriptor *altsd, 312 unsigned int attr) 313 { 314 struct usb_host_interface *alts; 315 struct usb_interface *iface; 316 unsigned int ep; 317 unsigned int ifnum; 318 319 /* Implicit feedback sync EPs consumers are always playback EPs */ 320 if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK) 321 return 0; 322 323 switch (subs->stream->chip->usb_id) { 324 case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */ 325 case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */ 326 ep = 0x81; 327 ifnum = 3; 328 goto add_sync_ep_from_ifnum; 329 case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */ 330 case USB_ID(0x0763, 0x2081): 331 ep = 0x81; 332 ifnum = 2; 333 goto add_sync_ep_from_ifnum; 334 case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */ 335 ep = 0x86; 336 ifnum = 2; 337 goto add_sync_ep_from_ifnum; 338 case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx III */ 339 ep = 0x81; 340 ifnum = 2; 341 goto add_sync_ep_from_ifnum; 342 case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */ 343 ep = 0x81; 344 ifnum = 1; 345 goto add_sync_ep_from_ifnum; 346 case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II */ 347 ep = 0x84; 348 ifnum = 0; 349 goto add_sync_ep_from_ifnum; 350 } 351 352 if (attr == USB_ENDPOINT_SYNC_ASYNC && 353 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC && 354 altsd->bInterfaceProtocol == 2 && 355 altsd->bNumEndpoints == 1 && 356 USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ && 357 search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1, 358 altsd->bAlternateSetting, 359 &alts, &ep) >= 0) { 360 goto add_sync_ep; 361 } 362 363 /* No quirk */ 364 return 0; 365 366 add_sync_ep_from_ifnum: 367 iface = usb_ifnum_to_if(dev, ifnum); 368 369 if (!iface || iface->num_altsetting == 0) 370 return -EINVAL; 371 372 alts = &iface->altsetting[1]; 373 374 add_sync_ep: 375 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip, 376 alts, ep, !subs->direction, 377 SND_USB_ENDPOINT_TYPE_DATA); 378 if (!subs->sync_endpoint) 379 return -EINVAL; 380 381 subs->data_endpoint->sync_master = subs->sync_endpoint; 382 383 return 1; 384 } 385 386 static int set_sync_endpoint(struct snd_usb_substream *subs, 387 struct audioformat *fmt, 388 struct usb_device *dev, 389 struct usb_host_interface *alts, 390 struct usb_interface_descriptor *altsd) 391 { 392 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK; 393 unsigned int ep, attr; 394 bool implicit_fb; 395 int err; 396 397 /* we need a sync pipe in async OUT or adaptive IN mode */ 398 /* check the number of EP, since some devices have broken 399 * descriptors which fool us. if it has only one EP, 400 * assume it as adaptive-out or sync-in. 401 */ 402 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE; 403 404 if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) || 405 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) { 406 407 /* 408 * In these modes the notion of sync_endpoint is irrelevant. 409 * Reset pointers to avoid using stale data from previously 410 * used settings, e.g. when configuration and endpoints were 411 * changed 412 */ 413 414 subs->sync_endpoint = NULL; 415 subs->data_endpoint->sync_master = NULL; 416 } 417 418 err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr); 419 if (err < 0) 420 return err; 421 422 /* endpoint set by quirk */ 423 if (err > 0) 424 return 0; 425 426 if (altsd->bNumEndpoints < 2) 427 return 0; 428 429 if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC || 430 attr == USB_ENDPOINT_SYNC_ADAPTIVE)) || 431 (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE)) 432 return 0; 433 434 /* 435 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see 436 * if we don't find a sync endpoint, as on M-Audio Transit. In case of 437 * error fall back to SYNC mode and don't create sync endpoint 438 */ 439 440 /* check sync-pipe endpoint */ 441 /* ... and check descriptor size before accessing bSynchAddress 442 because there is a version of the SB Audigy 2 NX firmware lacking 443 the audio fields in the endpoint descriptors */ 444 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC || 445 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE && 446 get_endpoint(alts, 1)->bSynchAddress != 0)) { 447 dev_err(&dev->dev, 448 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n", 449 fmt->iface, fmt->altsetting, 450 get_endpoint(alts, 1)->bmAttributes, 451 get_endpoint(alts, 1)->bLength, 452 get_endpoint(alts, 1)->bSynchAddress); 453 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE) 454 return 0; 455 return -EINVAL; 456 } 457 ep = get_endpoint(alts, 1)->bEndpointAddress; 458 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE && 459 ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) || 460 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) { 461 dev_err(&dev->dev, 462 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n", 463 fmt->iface, fmt->altsetting, 464 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress); 465 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE) 466 return 0; 467 return -EINVAL; 468 } 469 470 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK) 471 == USB_ENDPOINT_USAGE_IMPLICIT_FB; 472 473 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip, 474 alts, ep, !subs->direction, 475 implicit_fb ? 476 SND_USB_ENDPOINT_TYPE_DATA : 477 SND_USB_ENDPOINT_TYPE_SYNC); 478 if (!subs->sync_endpoint) { 479 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE) 480 return 0; 481 return -EINVAL; 482 } 483 484 subs->data_endpoint->sync_master = subs->sync_endpoint; 485 486 return 0; 487 } 488 489 /* 490 * find a matching format and set up the interface 491 */ 492 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt) 493 { 494 struct usb_device *dev = subs->dev; 495 struct usb_host_interface *alts; 496 struct usb_interface_descriptor *altsd; 497 struct usb_interface *iface; 498 int err; 499 500 iface = usb_ifnum_to_if(dev, fmt->iface); 501 if (WARN_ON(!iface)) 502 return -EINVAL; 503 alts = usb_altnum_to_altsetting(iface, fmt->altsetting); 504 altsd = get_iface_desc(alts); 505 if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting)) 506 return -EINVAL; 507 508 if (fmt == subs->cur_audiofmt) 509 return 0; 510 511 /* close the old interface */ 512 if (subs->interface >= 0 && subs->interface != fmt->iface) { 513 if (!subs->stream->chip->keep_iface) { 514 err = usb_set_interface(subs->dev, subs->interface, 0); 515 if (err < 0) { 516 dev_err(&dev->dev, 517 "%d:%d: return to setting 0 failed (%d)\n", 518 fmt->iface, fmt->altsetting, err); 519 return -EIO; 520 } 521 } 522 subs->interface = -1; 523 subs->altset_idx = 0; 524 } 525 526 /* set interface */ 527 if (iface->cur_altsetting != alts) { 528 err = snd_usb_select_mode_quirk(subs, fmt); 529 if (err < 0) 530 return -EIO; 531 532 err = usb_set_interface(dev, fmt->iface, fmt->altsetting); 533 if (err < 0) { 534 dev_err(&dev->dev, 535 "%d:%d: usb_set_interface failed (%d)\n", 536 fmt->iface, fmt->altsetting, err); 537 return -EIO; 538 } 539 dev_dbg(&dev->dev, "setting usb interface %d:%d\n", 540 fmt->iface, fmt->altsetting); 541 snd_usb_set_interface_quirk(dev); 542 } 543 544 subs->interface = fmt->iface; 545 subs->altset_idx = fmt->altset_idx; 546 subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip, 547 alts, fmt->endpoint, subs->direction, 548 SND_USB_ENDPOINT_TYPE_DATA); 549 550 if (!subs->data_endpoint) 551 return -EINVAL; 552 553 err = set_sync_endpoint(subs, fmt, dev, alts, altsd); 554 if (err < 0) 555 return err; 556 557 err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt); 558 if (err < 0) 559 return err; 560 561 subs->cur_audiofmt = fmt; 562 563 snd_usb_set_format_quirk(subs, fmt); 564 565 return 0; 566 } 567 568 /* 569 * Return the score of matching two audioformats. 570 * Veto the audioformat if: 571 * - It has no channels for some reason. 572 * - Requested PCM format is not supported. 573 * - Requested sample rate is not supported. 574 */ 575 static int match_endpoint_audioformats(struct snd_usb_substream *subs, 576 struct audioformat *fp, 577 struct audioformat *match, int rate, 578 snd_pcm_format_t pcm_format) 579 { 580 int i; 581 int score = 0; 582 583 if (fp->channels < 1) { 584 dev_dbg(&subs->dev->dev, 585 "%s: (fmt @%p) no channels\n", __func__, fp); 586 return 0; 587 } 588 589 if (!(fp->formats & pcm_format_to_bits(pcm_format))) { 590 dev_dbg(&subs->dev->dev, 591 "%s: (fmt @%p) no match for format %d\n", __func__, 592 fp, pcm_format); 593 return 0; 594 } 595 596 for (i = 0; i < fp->nr_rates; i++) { 597 if (fp->rate_table[i] == rate) { 598 score++; 599 break; 600 } 601 } 602 if (!score) { 603 dev_dbg(&subs->dev->dev, 604 "%s: (fmt @%p) no match for rate %d\n", __func__, 605 fp, rate); 606 return 0; 607 } 608 609 if (fp->channels == match->channels) 610 score++; 611 612 dev_dbg(&subs->dev->dev, 613 "%s: (fmt @%p) score %d\n", __func__, fp, score); 614 615 return score; 616 } 617 618 /* 619 * Configure the sync ep using the rate and pcm format of the data ep. 620 */ 621 static int configure_sync_endpoint(struct snd_usb_substream *subs) 622 { 623 int ret; 624 struct audioformat *fp; 625 struct audioformat *sync_fp = NULL; 626 int cur_score = 0; 627 int sync_period_bytes = subs->period_bytes; 628 struct snd_usb_substream *sync_subs = 629 &subs->stream->substream[subs->direction ^ 1]; 630 631 if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA || 632 !subs->stream) 633 return snd_usb_endpoint_set_params(subs->sync_endpoint, 634 subs->pcm_format, 635 subs->channels, 636 subs->period_bytes, 637 0, 0, 638 subs->cur_rate, 639 subs->cur_audiofmt, 640 NULL); 641 642 /* Try to find the best matching audioformat. */ 643 list_for_each_entry(fp, &sync_subs->fmt_list, list) { 644 int score = match_endpoint_audioformats(subs, 645 fp, subs->cur_audiofmt, 646 subs->cur_rate, subs->pcm_format); 647 648 if (score > cur_score) { 649 sync_fp = fp; 650 cur_score = score; 651 } 652 } 653 654 if (unlikely(sync_fp == NULL)) { 655 dev_err(&subs->dev->dev, 656 "%s: no valid audioformat for sync ep %x found\n", 657 __func__, sync_subs->ep_num); 658 return -EINVAL; 659 } 660 661 /* 662 * Recalculate the period bytes if channel number differ between 663 * data and sync ep audioformat. 664 */ 665 if (sync_fp->channels != subs->channels) { 666 sync_period_bytes = (subs->period_bytes / subs->channels) * 667 sync_fp->channels; 668 dev_dbg(&subs->dev->dev, 669 "%s: adjusted sync ep period bytes (%d -> %d)\n", 670 __func__, subs->period_bytes, sync_period_bytes); 671 } 672 673 ret = snd_usb_endpoint_set_params(subs->sync_endpoint, 674 subs->pcm_format, 675 sync_fp->channels, 676 sync_period_bytes, 677 0, 0, 678 subs->cur_rate, 679 sync_fp, 680 NULL); 681 682 return ret; 683 } 684 685 /* 686 * configure endpoint params 687 * 688 * called during initial setup and upon resume 689 */ 690 static int configure_endpoint(struct snd_usb_substream *subs) 691 { 692 int ret; 693 694 /* format changed */ 695 stop_endpoints(subs, true); 696 ret = snd_usb_endpoint_set_params(subs->data_endpoint, 697 subs->pcm_format, 698 subs->channels, 699 subs->period_bytes, 700 subs->period_frames, 701 subs->buffer_periods, 702 subs->cur_rate, 703 subs->cur_audiofmt, 704 subs->sync_endpoint); 705 if (ret < 0) 706 return ret; 707 708 if (subs->sync_endpoint) 709 ret = configure_sync_endpoint(subs); 710 711 return ret; 712 } 713 714 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state) 715 { 716 int ret; 717 718 if (!subs->str_pd) 719 return 0; 720 721 ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state); 722 if (ret < 0) { 723 dev_err(&subs->dev->dev, 724 "Cannot change Power Domain ID: %d to state: %d. Err: %d\n", 725 subs->str_pd->pd_id, state, ret); 726 return ret; 727 } 728 729 return 0; 730 } 731 732 int snd_usb_pcm_suspend(struct snd_usb_stream *as) 733 { 734 int ret; 735 736 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2); 737 if (ret < 0) 738 return ret; 739 740 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2); 741 if (ret < 0) 742 return ret; 743 744 return 0; 745 } 746 747 int snd_usb_pcm_resume(struct snd_usb_stream *as) 748 { 749 int ret; 750 751 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1); 752 if (ret < 0) 753 return ret; 754 755 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1); 756 if (ret < 0) 757 return ret; 758 759 return 0; 760 } 761 762 /* 763 * hw_params callback 764 * 765 * allocate a buffer and set the given audio format. 766 * 767 * so far we use a physically linear buffer although packetize transfer 768 * doesn't need a continuous area. 769 * if sg buffer is supported on the later version of alsa, we'll follow 770 * that. 771 */ 772 static int snd_usb_hw_params(struct snd_pcm_substream *substream, 773 struct snd_pcm_hw_params *hw_params) 774 { 775 struct snd_usb_substream *subs = substream->runtime->private_data; 776 struct audioformat *fmt; 777 int ret; 778 779 ret = snd_media_start_pipeline(subs); 780 if (ret) 781 return ret; 782 783 if (snd_usb_use_vmalloc) 784 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream, 785 params_buffer_bytes(hw_params)); 786 else 787 ret = snd_pcm_lib_malloc_pages(substream, 788 params_buffer_bytes(hw_params)); 789 if (ret < 0) 790 goto stop_pipeline; 791 792 subs->pcm_format = params_format(hw_params); 793 subs->period_bytes = params_period_bytes(hw_params); 794 subs->period_frames = params_period_size(hw_params); 795 subs->buffer_periods = params_periods(hw_params); 796 subs->channels = params_channels(hw_params); 797 subs->cur_rate = params_rate(hw_params); 798 799 fmt = find_format(subs); 800 if (!fmt) { 801 dev_dbg(&subs->dev->dev, 802 "cannot set format: format = %#x, rate = %d, channels = %d\n", 803 subs->pcm_format, subs->cur_rate, subs->channels); 804 ret = -EINVAL; 805 goto stop_pipeline; 806 } 807 808 ret = snd_usb_lock_shutdown(subs->stream->chip); 809 if (ret < 0) 810 goto stop_pipeline; 811 812 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0); 813 if (ret < 0) 814 goto unlock; 815 816 ret = set_format(subs, fmt); 817 if (ret < 0) 818 goto unlock; 819 820 subs->interface = fmt->iface; 821 subs->altset_idx = fmt->altset_idx; 822 subs->need_setup_ep = true; 823 824 unlock: 825 snd_usb_unlock_shutdown(subs->stream->chip); 826 if (ret < 0) 827 goto stop_pipeline; 828 return ret; 829 830 stop_pipeline: 831 snd_media_stop_pipeline(subs); 832 return ret; 833 } 834 835 /* 836 * hw_free callback 837 * 838 * reset the audio format and release the buffer 839 */ 840 static int snd_usb_hw_free(struct snd_pcm_substream *substream) 841 { 842 struct snd_usb_substream *subs = substream->runtime->private_data; 843 844 snd_media_stop_pipeline(subs); 845 subs->cur_audiofmt = NULL; 846 subs->cur_rate = 0; 847 subs->period_bytes = 0; 848 if (!snd_usb_lock_shutdown(subs->stream->chip)) { 849 stop_endpoints(subs, true); 850 snd_usb_endpoint_deactivate(subs->sync_endpoint); 851 snd_usb_endpoint_deactivate(subs->data_endpoint); 852 snd_usb_unlock_shutdown(subs->stream->chip); 853 } 854 855 if (snd_usb_use_vmalloc) 856 return snd_pcm_lib_free_vmalloc_buffer(substream); 857 else 858 return snd_pcm_lib_free_pages(substream); 859 } 860 861 /* 862 * prepare callback 863 * 864 * only a few subtle things... 865 */ 866 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream) 867 { 868 struct snd_pcm_runtime *runtime = substream->runtime; 869 struct snd_usb_substream *subs = runtime->private_data; 870 struct usb_host_interface *alts; 871 struct usb_interface *iface; 872 int ret; 873 874 if (! subs->cur_audiofmt) { 875 dev_err(&subs->dev->dev, "no format is specified!\n"); 876 return -ENXIO; 877 } 878 879 ret = snd_usb_lock_shutdown(subs->stream->chip); 880 if (ret < 0) 881 return ret; 882 if (snd_BUG_ON(!subs->data_endpoint)) { 883 ret = -EIO; 884 goto unlock; 885 } 886 887 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint); 888 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint); 889 890 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0); 891 if (ret < 0) 892 goto unlock; 893 894 ret = set_format(subs, subs->cur_audiofmt); 895 if (ret < 0) 896 goto unlock; 897 898 if (subs->need_setup_ep) { 899 900 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface); 901 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx]; 902 ret = snd_usb_init_sample_rate(subs->stream->chip, 903 subs->cur_audiofmt->iface, 904 alts, 905 subs->cur_audiofmt, 906 subs->cur_rate); 907 if (ret < 0) 908 goto unlock; 909 910 ret = configure_endpoint(subs); 911 if (ret < 0) 912 goto unlock; 913 subs->need_setup_ep = false; 914 } 915 916 /* some unit conversions in runtime */ 917 subs->data_endpoint->maxframesize = 918 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize); 919 subs->data_endpoint->curframesize = 920 bytes_to_frames(runtime, subs->data_endpoint->curpacksize); 921 922 /* reset the pointer */ 923 subs->hwptr_done = 0; 924 subs->transfer_done = 0; 925 subs->last_delay = 0; 926 subs->last_frame_number = 0; 927 runtime->delay = 0; 928 929 /* for playback, submit the URBs now; otherwise, the first hwptr_done 930 * updates for all URBs would happen at the same time when starting */ 931 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) 932 ret = start_endpoints(subs); 933 934 unlock: 935 snd_usb_unlock_shutdown(subs->stream->chip); 936 return ret; 937 } 938 939 static const struct snd_pcm_hardware snd_usb_hardware = 940 { 941 .info = SNDRV_PCM_INFO_MMAP | 942 SNDRV_PCM_INFO_MMAP_VALID | 943 SNDRV_PCM_INFO_BATCH | 944 SNDRV_PCM_INFO_INTERLEAVED | 945 SNDRV_PCM_INFO_BLOCK_TRANSFER | 946 SNDRV_PCM_INFO_PAUSE, 947 .buffer_bytes_max = 1024 * 1024, 948 .period_bytes_min = 64, 949 .period_bytes_max = 512 * 1024, 950 .periods_min = 2, 951 .periods_max = 1024, 952 }; 953 954 static int hw_check_valid_format(struct snd_usb_substream *subs, 955 struct snd_pcm_hw_params *params, 956 struct audioformat *fp) 957 { 958 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 959 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 960 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 961 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME); 962 struct snd_mask check_fmts; 963 unsigned int ptime; 964 965 /* check the format */ 966 snd_mask_none(&check_fmts); 967 check_fmts.bits[0] = (u32)fp->formats; 968 check_fmts.bits[1] = (u32)(fp->formats >> 32); 969 snd_mask_intersect(&check_fmts, fmts); 970 if (snd_mask_empty(&check_fmts)) { 971 hwc_debug(" > check: no supported format %d\n", fp->format); 972 return 0; 973 } 974 /* check the channels */ 975 if (fp->channels < ct->min || fp->channels > ct->max) { 976 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max); 977 return 0; 978 } 979 /* check the rate is within the range */ 980 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) { 981 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max); 982 return 0; 983 } 984 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) { 985 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min); 986 return 0; 987 } 988 /* check whether the period time is >= the data packet interval */ 989 if (subs->speed != USB_SPEED_FULL) { 990 ptime = 125 * (1 << fp->datainterval); 991 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) { 992 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max); 993 return 0; 994 } 995 } 996 return 1; 997 } 998 999 static int hw_rule_rate(struct snd_pcm_hw_params *params, 1000 struct snd_pcm_hw_rule *rule) 1001 { 1002 struct snd_usb_substream *subs = rule->private; 1003 struct audioformat *fp; 1004 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 1005 unsigned int rmin, rmax; 1006 int changed; 1007 1008 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max); 1009 changed = 0; 1010 rmin = rmax = 0; 1011 list_for_each_entry(fp, &subs->fmt_list, list) { 1012 if (!hw_check_valid_format(subs, params, fp)) 1013 continue; 1014 if (changed++) { 1015 if (rmin > fp->rate_min) 1016 rmin = fp->rate_min; 1017 if (rmax < fp->rate_max) 1018 rmax = fp->rate_max; 1019 } else { 1020 rmin = fp->rate_min; 1021 rmax = fp->rate_max; 1022 } 1023 } 1024 1025 if (!changed) { 1026 hwc_debug(" --> get empty\n"); 1027 it->empty = 1; 1028 return -EINVAL; 1029 } 1030 1031 changed = 0; 1032 if (it->min < rmin) { 1033 it->min = rmin; 1034 it->openmin = 0; 1035 changed = 1; 1036 } 1037 if (it->max > rmax) { 1038 it->max = rmax; 1039 it->openmax = 0; 1040 changed = 1; 1041 } 1042 if (snd_interval_checkempty(it)) { 1043 it->empty = 1; 1044 return -EINVAL; 1045 } 1046 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed); 1047 return changed; 1048 } 1049 1050 1051 static int hw_rule_channels(struct snd_pcm_hw_params *params, 1052 struct snd_pcm_hw_rule *rule) 1053 { 1054 struct snd_usb_substream *subs = rule->private; 1055 struct audioformat *fp; 1056 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 1057 unsigned int rmin, rmax; 1058 int changed; 1059 1060 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max); 1061 changed = 0; 1062 rmin = rmax = 0; 1063 list_for_each_entry(fp, &subs->fmt_list, list) { 1064 if (!hw_check_valid_format(subs, params, fp)) 1065 continue; 1066 if (changed++) { 1067 if (rmin > fp->channels) 1068 rmin = fp->channels; 1069 if (rmax < fp->channels) 1070 rmax = fp->channels; 1071 } else { 1072 rmin = fp->channels; 1073 rmax = fp->channels; 1074 } 1075 } 1076 1077 if (!changed) { 1078 hwc_debug(" --> get empty\n"); 1079 it->empty = 1; 1080 return -EINVAL; 1081 } 1082 1083 changed = 0; 1084 if (it->min < rmin) { 1085 it->min = rmin; 1086 it->openmin = 0; 1087 changed = 1; 1088 } 1089 if (it->max > rmax) { 1090 it->max = rmax; 1091 it->openmax = 0; 1092 changed = 1; 1093 } 1094 if (snd_interval_checkempty(it)) { 1095 it->empty = 1; 1096 return -EINVAL; 1097 } 1098 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed); 1099 return changed; 1100 } 1101 1102 static int hw_rule_format(struct snd_pcm_hw_params *params, 1103 struct snd_pcm_hw_rule *rule) 1104 { 1105 struct snd_usb_substream *subs = rule->private; 1106 struct audioformat *fp; 1107 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 1108 u64 fbits; 1109 u32 oldbits[2]; 1110 int changed; 1111 1112 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]); 1113 fbits = 0; 1114 list_for_each_entry(fp, &subs->fmt_list, list) { 1115 if (!hw_check_valid_format(subs, params, fp)) 1116 continue; 1117 fbits |= fp->formats; 1118 } 1119 1120 oldbits[0] = fmt->bits[0]; 1121 oldbits[1] = fmt->bits[1]; 1122 fmt->bits[0] &= (u32)fbits; 1123 fmt->bits[1] &= (u32)(fbits >> 32); 1124 if (!fmt->bits[0] && !fmt->bits[1]) { 1125 hwc_debug(" --> get empty\n"); 1126 return -EINVAL; 1127 } 1128 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]); 1129 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed); 1130 return changed; 1131 } 1132 1133 static int hw_rule_period_time(struct snd_pcm_hw_params *params, 1134 struct snd_pcm_hw_rule *rule) 1135 { 1136 struct snd_usb_substream *subs = rule->private; 1137 struct audioformat *fp; 1138 struct snd_interval *it; 1139 unsigned char min_datainterval; 1140 unsigned int pmin; 1141 int changed; 1142 1143 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME); 1144 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max); 1145 min_datainterval = 0xff; 1146 list_for_each_entry(fp, &subs->fmt_list, list) { 1147 if (!hw_check_valid_format(subs, params, fp)) 1148 continue; 1149 min_datainterval = min(min_datainterval, fp->datainterval); 1150 } 1151 if (min_datainterval == 0xff) { 1152 hwc_debug(" --> get empty\n"); 1153 it->empty = 1; 1154 return -EINVAL; 1155 } 1156 pmin = 125 * (1 << min_datainterval); 1157 changed = 0; 1158 if (it->min < pmin) { 1159 it->min = pmin; 1160 it->openmin = 0; 1161 changed = 1; 1162 } 1163 if (snd_interval_checkempty(it)) { 1164 it->empty = 1; 1165 return -EINVAL; 1166 } 1167 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed); 1168 return changed; 1169 } 1170 1171 /* 1172 * If the device supports unusual bit rates, does the request meet these? 1173 */ 1174 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime, 1175 struct snd_usb_substream *subs) 1176 { 1177 struct audioformat *fp; 1178 int *rate_list; 1179 int count = 0, needs_knot = 0; 1180 int err; 1181 1182 kfree(subs->rate_list.list); 1183 subs->rate_list.list = NULL; 1184 1185 list_for_each_entry(fp, &subs->fmt_list, list) { 1186 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS) 1187 return 0; 1188 count += fp->nr_rates; 1189 if (fp->rates & SNDRV_PCM_RATE_KNOT) 1190 needs_knot = 1; 1191 } 1192 if (!needs_knot) 1193 return 0; 1194 1195 subs->rate_list.list = rate_list = 1196 kmalloc_array(count, sizeof(int), GFP_KERNEL); 1197 if (!subs->rate_list.list) 1198 return -ENOMEM; 1199 subs->rate_list.count = count; 1200 subs->rate_list.mask = 0; 1201 count = 0; 1202 list_for_each_entry(fp, &subs->fmt_list, list) { 1203 int i; 1204 for (i = 0; i < fp->nr_rates; i++) 1205 rate_list[count++] = fp->rate_table[i]; 1206 } 1207 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1208 &subs->rate_list); 1209 if (err < 0) 1210 return err; 1211 1212 return 0; 1213 } 1214 1215 1216 /* 1217 * set up the runtime hardware information. 1218 */ 1219 1220 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs) 1221 { 1222 struct audioformat *fp; 1223 unsigned int pt, ptmin; 1224 int param_period_time_if_needed; 1225 int err; 1226 1227 runtime->hw.formats = subs->formats; 1228 1229 runtime->hw.rate_min = 0x7fffffff; 1230 runtime->hw.rate_max = 0; 1231 runtime->hw.channels_min = 256; 1232 runtime->hw.channels_max = 0; 1233 runtime->hw.rates = 0; 1234 ptmin = UINT_MAX; 1235 /* check min/max rates and channels */ 1236 list_for_each_entry(fp, &subs->fmt_list, list) { 1237 runtime->hw.rates |= fp->rates; 1238 if (runtime->hw.rate_min > fp->rate_min) 1239 runtime->hw.rate_min = fp->rate_min; 1240 if (runtime->hw.rate_max < fp->rate_max) 1241 runtime->hw.rate_max = fp->rate_max; 1242 if (runtime->hw.channels_min > fp->channels) 1243 runtime->hw.channels_min = fp->channels; 1244 if (runtime->hw.channels_max < fp->channels) 1245 runtime->hw.channels_max = fp->channels; 1246 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) { 1247 /* FIXME: there might be more than one audio formats... */ 1248 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max = 1249 fp->frame_size; 1250 } 1251 pt = 125 * (1 << fp->datainterval); 1252 ptmin = min(ptmin, pt); 1253 } 1254 1255 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME; 1256 if (subs->speed == USB_SPEED_FULL) 1257 /* full speed devices have fixed data packet interval */ 1258 ptmin = 1000; 1259 if (ptmin == 1000) 1260 /* if period time doesn't go below 1 ms, no rules needed */ 1261 param_period_time_if_needed = -1; 1262 1263 err = snd_pcm_hw_constraint_minmax(runtime, 1264 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1265 ptmin, UINT_MAX); 1266 if (err < 0) 1267 return err; 1268 1269 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1270 hw_rule_rate, subs, 1271 SNDRV_PCM_HW_PARAM_FORMAT, 1272 SNDRV_PCM_HW_PARAM_CHANNELS, 1273 param_period_time_if_needed, 1274 -1); 1275 if (err < 0) 1276 return err; 1277 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 1278 hw_rule_channels, subs, 1279 SNDRV_PCM_HW_PARAM_FORMAT, 1280 SNDRV_PCM_HW_PARAM_RATE, 1281 param_period_time_if_needed, 1282 -1); 1283 if (err < 0) 1284 return err; 1285 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 1286 hw_rule_format, subs, 1287 SNDRV_PCM_HW_PARAM_RATE, 1288 SNDRV_PCM_HW_PARAM_CHANNELS, 1289 param_period_time_if_needed, 1290 -1); 1291 if (err < 0) 1292 return err; 1293 if (param_period_time_if_needed >= 0) { 1294 err = snd_pcm_hw_rule_add(runtime, 0, 1295 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1296 hw_rule_period_time, subs, 1297 SNDRV_PCM_HW_PARAM_FORMAT, 1298 SNDRV_PCM_HW_PARAM_CHANNELS, 1299 SNDRV_PCM_HW_PARAM_RATE, 1300 -1); 1301 if (err < 0) 1302 return err; 1303 } 1304 err = snd_usb_pcm_check_knot(runtime, subs); 1305 if (err < 0) 1306 return err; 1307 1308 return snd_usb_autoresume(subs->stream->chip); 1309 } 1310 1311 static int snd_usb_pcm_open(struct snd_pcm_substream *substream) 1312 { 1313 int direction = substream->stream; 1314 struct snd_usb_stream *as = snd_pcm_substream_chip(substream); 1315 struct snd_pcm_runtime *runtime = substream->runtime; 1316 struct snd_usb_substream *subs = &as->substream[direction]; 1317 int ret; 1318 1319 subs->interface = -1; 1320 subs->altset_idx = 0; 1321 runtime->hw = snd_usb_hardware; 1322 runtime->private_data = subs; 1323 subs->pcm_substream = substream; 1324 /* runtime PM is also done there */ 1325 1326 /* initialize DSD/DOP context */ 1327 subs->dsd_dop.byte_idx = 0; 1328 subs->dsd_dop.channel = 0; 1329 subs->dsd_dop.marker = 1; 1330 1331 ret = setup_hw_info(runtime, subs); 1332 if (ret == 0) { 1333 ret = snd_media_stream_init(subs, as->pcm, direction); 1334 if (ret) 1335 snd_usb_autosuspend(subs->stream->chip); 1336 } 1337 return ret; 1338 } 1339 1340 static int snd_usb_pcm_close(struct snd_pcm_substream *substream) 1341 { 1342 int direction = substream->stream; 1343 struct snd_usb_stream *as = snd_pcm_substream_chip(substream); 1344 struct snd_usb_substream *subs = &as->substream[direction]; 1345 int ret; 1346 1347 stop_endpoints(subs, true); 1348 snd_media_stop_pipeline(subs); 1349 1350 if (!as->chip->keep_iface && 1351 subs->interface >= 0 && 1352 !snd_usb_lock_shutdown(subs->stream->chip)) { 1353 usb_set_interface(subs->dev, subs->interface, 0); 1354 subs->interface = -1; 1355 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1); 1356 snd_usb_unlock_shutdown(subs->stream->chip); 1357 if (ret < 0) 1358 return ret; 1359 } 1360 1361 subs->pcm_substream = NULL; 1362 snd_usb_autosuspend(subs->stream->chip); 1363 1364 return 0; 1365 } 1366 1367 /* Since a URB can handle only a single linear buffer, we must use double 1368 * buffering when the data to be transferred overflows the buffer boundary. 1369 * To avoid inconsistencies when updating hwptr_done, we use double buffering 1370 * for all URBs. 1371 */ 1372 static void retire_capture_urb(struct snd_usb_substream *subs, 1373 struct urb *urb) 1374 { 1375 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1376 unsigned int stride, frames, bytes, oldptr; 1377 int i, period_elapsed = 0; 1378 unsigned long flags; 1379 unsigned char *cp; 1380 int current_frame_number; 1381 1382 /* read frame number here, update pointer in critical section */ 1383 current_frame_number = usb_get_current_frame_number(subs->dev); 1384 1385 stride = runtime->frame_bits >> 3; 1386 1387 for (i = 0; i < urb->number_of_packets; i++) { 1388 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj; 1389 if (urb->iso_frame_desc[i].status && printk_ratelimit()) { 1390 dev_dbg(&subs->dev->dev, "frame %d active: %d\n", 1391 i, urb->iso_frame_desc[i].status); 1392 // continue; 1393 } 1394 bytes = urb->iso_frame_desc[i].actual_length; 1395 frames = bytes / stride; 1396 if (!subs->txfr_quirk) 1397 bytes = frames * stride; 1398 if (bytes % (runtime->sample_bits >> 3) != 0) { 1399 int oldbytes = bytes; 1400 bytes = frames * stride; 1401 dev_warn_ratelimited(&subs->dev->dev, 1402 "Corrected urb data len. %d->%d\n", 1403 oldbytes, bytes); 1404 } 1405 /* update the current pointer */ 1406 spin_lock_irqsave(&subs->lock, flags); 1407 oldptr = subs->hwptr_done; 1408 subs->hwptr_done += bytes; 1409 if (subs->hwptr_done >= runtime->buffer_size * stride) 1410 subs->hwptr_done -= runtime->buffer_size * stride; 1411 frames = (bytes + (oldptr % stride)) / stride; 1412 subs->transfer_done += frames; 1413 if (subs->transfer_done >= runtime->period_size) { 1414 subs->transfer_done -= runtime->period_size; 1415 period_elapsed = 1; 1416 } 1417 /* capture delay is by construction limited to one URB, 1418 * reset delays here 1419 */ 1420 runtime->delay = subs->last_delay = 0; 1421 1422 /* realign last_frame_number */ 1423 subs->last_frame_number = current_frame_number; 1424 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */ 1425 1426 spin_unlock_irqrestore(&subs->lock, flags); 1427 /* copy a data chunk */ 1428 if (oldptr + bytes > runtime->buffer_size * stride) { 1429 unsigned int bytes1 = 1430 runtime->buffer_size * stride - oldptr; 1431 memcpy(runtime->dma_area + oldptr, cp, bytes1); 1432 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1); 1433 } else { 1434 memcpy(runtime->dma_area + oldptr, cp, bytes); 1435 } 1436 } 1437 1438 if (period_elapsed) 1439 snd_pcm_period_elapsed(subs->pcm_substream); 1440 } 1441 1442 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs, 1443 struct urb *urb, unsigned int bytes) 1444 { 1445 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1446 unsigned int stride = runtime->frame_bits >> 3; 1447 unsigned int dst_idx = 0; 1448 unsigned int src_idx = subs->hwptr_done; 1449 unsigned int wrap = runtime->buffer_size * stride; 1450 u8 *dst = urb->transfer_buffer; 1451 u8 *src = runtime->dma_area; 1452 u8 marker[] = { 0x05, 0xfa }; 1453 1454 /* 1455 * The DSP DOP format defines a way to transport DSD samples over 1456 * normal PCM data endpoints. It requires stuffing of marker bytes 1457 * (0x05 and 0xfa, alternating per sample frame), and then expects 1458 * 2 additional bytes of actual payload. The whole frame is stored 1459 * LSB. 1460 * 1461 * Hence, for a stereo transport, the buffer layout looks like this, 1462 * where L refers to left channel samples and R to right. 1463 * 1464 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa 1465 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa 1466 * ..... 1467 * 1468 */ 1469 1470 while (bytes--) { 1471 if (++subs->dsd_dop.byte_idx == 3) { 1472 /* frame boundary? */ 1473 dst[dst_idx++] = marker[subs->dsd_dop.marker]; 1474 src_idx += 2; 1475 subs->dsd_dop.byte_idx = 0; 1476 1477 if (++subs->dsd_dop.channel % runtime->channels == 0) { 1478 /* alternate the marker */ 1479 subs->dsd_dop.marker++; 1480 subs->dsd_dop.marker %= ARRAY_SIZE(marker); 1481 subs->dsd_dop.channel = 0; 1482 } 1483 } else { 1484 /* stuff the DSD payload */ 1485 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap; 1486 1487 if (subs->cur_audiofmt->dsd_bitrev) 1488 dst[dst_idx++] = bitrev8(src[idx]); 1489 else 1490 dst[dst_idx++] = src[idx]; 1491 1492 subs->hwptr_done++; 1493 } 1494 } 1495 if (subs->hwptr_done >= runtime->buffer_size * stride) 1496 subs->hwptr_done -= runtime->buffer_size * stride; 1497 } 1498 1499 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb, 1500 int offset, int stride, unsigned int bytes) 1501 { 1502 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1503 1504 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) { 1505 /* err, the transferred area goes over buffer boundary. */ 1506 unsigned int bytes1 = 1507 runtime->buffer_size * stride - subs->hwptr_done; 1508 memcpy(urb->transfer_buffer + offset, 1509 runtime->dma_area + subs->hwptr_done, bytes1); 1510 memcpy(urb->transfer_buffer + offset + bytes1, 1511 runtime->dma_area, bytes - bytes1); 1512 } else { 1513 memcpy(urb->transfer_buffer + offset, 1514 runtime->dma_area + subs->hwptr_done, bytes); 1515 } 1516 subs->hwptr_done += bytes; 1517 if (subs->hwptr_done >= runtime->buffer_size * stride) 1518 subs->hwptr_done -= runtime->buffer_size * stride; 1519 } 1520 1521 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs, 1522 struct urb *urb, int stride, 1523 unsigned int bytes) 1524 { 1525 __le32 packet_length; 1526 int i; 1527 1528 /* Put __le32 length descriptor at start of each packet. */ 1529 for (i = 0; i < urb->number_of_packets; i++) { 1530 unsigned int length = urb->iso_frame_desc[i].length; 1531 unsigned int offset = urb->iso_frame_desc[i].offset; 1532 1533 packet_length = cpu_to_le32(length); 1534 offset += i * sizeof(packet_length); 1535 urb->iso_frame_desc[i].offset = offset; 1536 urb->iso_frame_desc[i].length += sizeof(packet_length); 1537 memcpy(urb->transfer_buffer + offset, 1538 &packet_length, sizeof(packet_length)); 1539 copy_to_urb(subs, urb, offset + sizeof(packet_length), 1540 stride, length); 1541 } 1542 /* Adjust transfer size accordingly. */ 1543 bytes += urb->number_of_packets * sizeof(packet_length); 1544 return bytes; 1545 } 1546 1547 static void prepare_playback_urb(struct snd_usb_substream *subs, 1548 struct urb *urb) 1549 { 1550 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1551 struct snd_usb_endpoint *ep = subs->data_endpoint; 1552 struct snd_urb_ctx *ctx = urb->context; 1553 unsigned int counts, frames, bytes; 1554 int i, stride, period_elapsed = 0; 1555 unsigned long flags; 1556 1557 stride = runtime->frame_bits >> 3; 1558 1559 frames = 0; 1560 urb->number_of_packets = 0; 1561 spin_lock_irqsave(&subs->lock, flags); 1562 subs->frame_limit += ep->max_urb_frames; 1563 for (i = 0; i < ctx->packets; i++) { 1564 if (ctx->packet_size[i]) 1565 counts = ctx->packet_size[i]; 1566 else 1567 counts = snd_usb_endpoint_next_packet_size(ep); 1568 1569 /* set up descriptor */ 1570 urb->iso_frame_desc[i].offset = frames * ep->stride; 1571 urb->iso_frame_desc[i].length = counts * ep->stride; 1572 frames += counts; 1573 urb->number_of_packets++; 1574 subs->transfer_done += counts; 1575 if (subs->transfer_done >= runtime->period_size) { 1576 subs->transfer_done -= runtime->period_size; 1577 subs->frame_limit = 0; 1578 period_elapsed = 1; 1579 if (subs->fmt_type == UAC_FORMAT_TYPE_II) { 1580 if (subs->transfer_done > 0) { 1581 /* FIXME: fill-max mode is not 1582 * supported yet */ 1583 frames -= subs->transfer_done; 1584 counts -= subs->transfer_done; 1585 urb->iso_frame_desc[i].length = 1586 counts * ep->stride; 1587 subs->transfer_done = 0; 1588 } 1589 i++; 1590 if (i < ctx->packets) { 1591 /* add a transfer delimiter */ 1592 urb->iso_frame_desc[i].offset = 1593 frames * ep->stride; 1594 urb->iso_frame_desc[i].length = 0; 1595 urb->number_of_packets++; 1596 } 1597 break; 1598 } 1599 } 1600 /* finish at the period boundary or after enough frames */ 1601 if ((period_elapsed || 1602 subs->transfer_done >= subs->frame_limit) && 1603 !snd_usb_endpoint_implicit_feedback_sink(ep)) 1604 break; 1605 } 1606 bytes = frames * ep->stride; 1607 1608 if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE && 1609 subs->cur_audiofmt->dsd_dop)) { 1610 fill_playback_urb_dsd_dop(subs, urb, bytes); 1611 } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 && 1612 subs->cur_audiofmt->dsd_bitrev)) { 1613 /* bit-reverse the bytes */ 1614 u8 *buf = urb->transfer_buffer; 1615 for (i = 0; i < bytes; i++) { 1616 int idx = (subs->hwptr_done + i) 1617 % (runtime->buffer_size * stride); 1618 buf[i] = bitrev8(runtime->dma_area[idx]); 1619 } 1620 1621 subs->hwptr_done += bytes; 1622 if (subs->hwptr_done >= runtime->buffer_size * stride) 1623 subs->hwptr_done -= runtime->buffer_size * stride; 1624 } else { 1625 /* usual PCM */ 1626 if (!subs->tx_length_quirk) 1627 copy_to_urb(subs, urb, 0, stride, bytes); 1628 else 1629 bytes = copy_to_urb_quirk(subs, urb, stride, bytes); 1630 /* bytes is now amount of outgoing data */ 1631 } 1632 1633 /* update delay with exact number of samples queued */ 1634 runtime->delay = subs->last_delay; 1635 runtime->delay += frames; 1636 subs->last_delay = runtime->delay; 1637 1638 /* realign last_frame_number */ 1639 subs->last_frame_number = usb_get_current_frame_number(subs->dev); 1640 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */ 1641 1642 if (subs->trigger_tstamp_pending_update) { 1643 /* this is the first actual URB submitted, 1644 * update trigger timestamp to reflect actual start time 1645 */ 1646 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 1647 subs->trigger_tstamp_pending_update = false; 1648 } 1649 1650 spin_unlock_irqrestore(&subs->lock, flags); 1651 urb->transfer_buffer_length = bytes; 1652 if (period_elapsed) 1653 snd_pcm_period_elapsed(subs->pcm_substream); 1654 } 1655 1656 /* 1657 * process after playback data complete 1658 * - decrease the delay count again 1659 */ 1660 static void retire_playback_urb(struct snd_usb_substream *subs, 1661 struct urb *urb) 1662 { 1663 unsigned long flags; 1664 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1665 struct snd_usb_endpoint *ep = subs->data_endpoint; 1666 int processed = urb->transfer_buffer_length / ep->stride; 1667 int est_delay; 1668 1669 /* ignore the delay accounting when procssed=0 is given, i.e. 1670 * silent payloads are procssed before handling the actual data 1671 */ 1672 if (!processed) 1673 return; 1674 1675 spin_lock_irqsave(&subs->lock, flags); 1676 if (!subs->last_delay) 1677 goto out; /* short path */ 1678 1679 est_delay = snd_usb_pcm_delay(subs, runtime->rate); 1680 /* update delay with exact number of samples played */ 1681 if (processed > subs->last_delay) 1682 subs->last_delay = 0; 1683 else 1684 subs->last_delay -= processed; 1685 runtime->delay = subs->last_delay; 1686 1687 /* 1688 * Report when delay estimate is off by more than 2ms. 1689 * The error should be lower than 2ms since the estimate relies 1690 * on two reads of a counter updated every ms. 1691 */ 1692 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2) 1693 dev_dbg_ratelimited(&subs->dev->dev, 1694 "delay: estimated %d, actual %d\n", 1695 est_delay, subs->last_delay); 1696 1697 if (!subs->running) { 1698 /* update last_frame_number for delay counting here since 1699 * prepare_playback_urb won't be called during pause 1700 */ 1701 subs->last_frame_number = 1702 usb_get_current_frame_number(subs->dev) & 0xff; 1703 } 1704 1705 out: 1706 spin_unlock_irqrestore(&subs->lock, flags); 1707 } 1708 1709 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream, 1710 int cmd) 1711 { 1712 struct snd_usb_substream *subs = substream->runtime->private_data; 1713 1714 switch (cmd) { 1715 case SNDRV_PCM_TRIGGER_START: 1716 subs->trigger_tstamp_pending_update = true; 1717 /* fall through */ 1718 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 1719 subs->data_endpoint->prepare_data_urb = prepare_playback_urb; 1720 subs->data_endpoint->retire_data_urb = retire_playback_urb; 1721 subs->running = 1; 1722 return 0; 1723 case SNDRV_PCM_TRIGGER_STOP: 1724 stop_endpoints(subs, false); 1725 subs->running = 0; 1726 return 0; 1727 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 1728 subs->data_endpoint->prepare_data_urb = NULL; 1729 /* keep retire_data_urb for delay calculation */ 1730 subs->data_endpoint->retire_data_urb = retire_playback_urb; 1731 subs->running = 0; 1732 return 0; 1733 } 1734 1735 return -EINVAL; 1736 } 1737 1738 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream, 1739 int cmd) 1740 { 1741 int err; 1742 struct snd_usb_substream *subs = substream->runtime->private_data; 1743 1744 switch (cmd) { 1745 case SNDRV_PCM_TRIGGER_START: 1746 err = start_endpoints(subs); 1747 if (err < 0) 1748 return err; 1749 1750 subs->data_endpoint->retire_data_urb = retire_capture_urb; 1751 subs->running = 1; 1752 return 0; 1753 case SNDRV_PCM_TRIGGER_STOP: 1754 stop_endpoints(subs, false); 1755 subs->running = 0; 1756 return 0; 1757 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 1758 subs->data_endpoint->retire_data_urb = NULL; 1759 subs->running = 0; 1760 return 0; 1761 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 1762 subs->data_endpoint->retire_data_urb = retire_capture_urb; 1763 subs->running = 1; 1764 return 0; 1765 } 1766 1767 return -EINVAL; 1768 } 1769 1770 static const struct snd_pcm_ops snd_usb_playback_ops = { 1771 .open = snd_usb_pcm_open, 1772 .close = snd_usb_pcm_close, 1773 .ioctl = snd_pcm_lib_ioctl, 1774 .hw_params = snd_usb_hw_params, 1775 .hw_free = snd_usb_hw_free, 1776 .prepare = snd_usb_pcm_prepare, 1777 .trigger = snd_usb_substream_playback_trigger, 1778 .pointer = snd_usb_pcm_pointer, 1779 .page = snd_pcm_lib_get_vmalloc_page, 1780 }; 1781 1782 static const struct snd_pcm_ops snd_usb_capture_ops = { 1783 .open = snd_usb_pcm_open, 1784 .close = snd_usb_pcm_close, 1785 .ioctl = snd_pcm_lib_ioctl, 1786 .hw_params = snd_usb_hw_params, 1787 .hw_free = snd_usb_hw_free, 1788 .prepare = snd_usb_pcm_prepare, 1789 .trigger = snd_usb_substream_capture_trigger, 1790 .pointer = snd_usb_pcm_pointer, 1791 .page = snd_pcm_lib_get_vmalloc_page, 1792 }; 1793 1794 static const struct snd_pcm_ops snd_usb_playback_dev_ops = { 1795 .open = snd_usb_pcm_open, 1796 .close = snd_usb_pcm_close, 1797 .ioctl = snd_pcm_lib_ioctl, 1798 .hw_params = snd_usb_hw_params, 1799 .hw_free = snd_usb_hw_free, 1800 .prepare = snd_usb_pcm_prepare, 1801 .trigger = snd_usb_substream_playback_trigger, 1802 .pointer = snd_usb_pcm_pointer, 1803 .page = snd_pcm_sgbuf_ops_page, 1804 }; 1805 1806 static const struct snd_pcm_ops snd_usb_capture_dev_ops = { 1807 .open = snd_usb_pcm_open, 1808 .close = snd_usb_pcm_close, 1809 .ioctl = snd_pcm_lib_ioctl, 1810 .hw_params = snd_usb_hw_params, 1811 .hw_free = snd_usb_hw_free, 1812 .prepare = snd_usb_pcm_prepare, 1813 .trigger = snd_usb_substream_capture_trigger, 1814 .pointer = snd_usb_pcm_pointer, 1815 .page = snd_pcm_sgbuf_ops_page, 1816 }; 1817 1818 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream) 1819 { 1820 const struct snd_pcm_ops *ops; 1821 1822 if (snd_usb_use_vmalloc) 1823 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ? 1824 &snd_usb_playback_ops : &snd_usb_capture_ops; 1825 else 1826 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ? 1827 &snd_usb_playback_dev_ops : &snd_usb_capture_dev_ops; 1828 snd_pcm_set_ops(pcm, stream, ops); 1829 } 1830 1831 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs) 1832 { 1833 struct snd_pcm *pcm = subs->stream->pcm; 1834 struct snd_pcm_substream *s = pcm->streams[subs->direction].substream; 1835 struct device *dev = subs->dev->bus->controller; 1836 1837 if (!snd_usb_use_vmalloc) 1838 snd_pcm_lib_preallocate_pages(s, SNDRV_DMA_TYPE_DEV_SG, 1839 dev, 64*1024, 512*1024); 1840 } 1841