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 = substream->runtime->private_data; 80 unsigned int hwptr_done; 81 82 if (atomic_read(&subs->stream->chip->shutdown)) 83 return SNDRV_PCM_POS_XRUN; 84 spin_lock(&subs->lock); 85 hwptr_done = subs->hwptr_done; 86 substream->runtime->delay = snd_usb_pcm_delay(subs, 87 substream->runtime->rate); 88 spin_unlock(&subs->lock); 89 return hwptr_done / (substream->runtime->frame_bits >> 3); 90 } 91 92 /* 93 * find a matching audio format 94 */ 95 static struct audioformat *find_format(struct snd_usb_substream *subs) 96 { 97 struct audioformat *fp; 98 struct audioformat *found = NULL; 99 int cur_attr = 0, attr; 100 101 list_for_each_entry(fp, &subs->fmt_list, list) { 102 if (!(fp->formats & pcm_format_to_bits(subs->pcm_format))) 103 continue; 104 if (fp->channels != subs->channels) 105 continue; 106 if (subs->cur_rate < fp->rate_min || 107 subs->cur_rate > fp->rate_max) 108 continue; 109 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) { 110 unsigned int i; 111 for (i = 0; i < fp->nr_rates; i++) 112 if (fp->rate_table[i] == subs->cur_rate) 113 break; 114 if (i >= fp->nr_rates) 115 continue; 116 } 117 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE; 118 if (! found) { 119 found = fp; 120 cur_attr = attr; 121 continue; 122 } 123 /* avoid async out and adaptive in if the other method 124 * supports the same format. 125 * this is a workaround for the case like 126 * M-audio audiophile USB. 127 */ 128 if (attr != cur_attr) { 129 if ((attr == USB_ENDPOINT_SYNC_ASYNC && 130 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) || 131 (attr == USB_ENDPOINT_SYNC_ADAPTIVE && 132 subs->direction == SNDRV_PCM_STREAM_CAPTURE)) 133 continue; 134 if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC && 135 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) || 136 (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE && 137 subs->direction == SNDRV_PCM_STREAM_CAPTURE)) { 138 found = fp; 139 cur_attr = attr; 140 continue; 141 } 142 } 143 /* find the format with the largest max. packet size */ 144 if (fp->maxpacksize > found->maxpacksize) { 145 found = fp; 146 cur_attr = attr; 147 } 148 } 149 return found; 150 } 151 152 static int init_pitch_v1(struct snd_usb_audio *chip, int iface, 153 struct usb_host_interface *alts, 154 struct audioformat *fmt) 155 { 156 struct usb_device *dev = chip->dev; 157 unsigned int ep; 158 unsigned char data[1]; 159 int err; 160 161 if (get_iface_desc(alts)->bNumEndpoints < 1) 162 return -EINVAL; 163 ep = get_endpoint(alts, 0)->bEndpointAddress; 164 165 data[0] = 1; 166 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR, 167 USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT, 168 UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep, 169 data, sizeof(data)); 170 if (err < 0) { 171 usb_audio_err(chip, "%d:%d: cannot set enable PITCH\n", 172 iface, ep); 173 return err; 174 } 175 176 return 0; 177 } 178 179 static int init_pitch_v2(struct snd_usb_audio *chip, int iface, 180 struct usb_host_interface *alts, 181 struct audioformat *fmt) 182 { 183 struct usb_device *dev = chip->dev; 184 unsigned char data[1]; 185 int err; 186 187 data[0] = 1; 188 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR, 189 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT, 190 UAC2_EP_CS_PITCH << 8, 0, 191 data, sizeof(data)); 192 if (err < 0) { 193 usb_audio_err(chip, "%d:%d: cannot set enable PITCH (v2)\n", 194 iface, fmt->altsetting); 195 return err; 196 } 197 198 return 0; 199 } 200 201 /* 202 * initialize the pitch control and sample rate 203 */ 204 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface, 205 struct usb_host_interface *alts, 206 struct audioformat *fmt) 207 { 208 /* if endpoint doesn't have pitch control, bail out */ 209 if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL)) 210 return 0; 211 212 switch (fmt->protocol) { 213 case UAC_VERSION_1: 214 default: 215 return init_pitch_v1(chip, iface, alts, fmt); 216 217 case UAC_VERSION_2: 218 return init_pitch_v2(chip, iface, alts, fmt); 219 } 220 } 221 222 static int start_endpoints(struct snd_usb_substream *subs) 223 { 224 int err; 225 226 if (!subs->data_endpoint) 227 return -EINVAL; 228 229 if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) { 230 struct snd_usb_endpoint *ep = subs->data_endpoint; 231 232 dev_dbg(&subs->dev->dev, "Starting data EP @%p\n", ep); 233 234 ep->data_subs = subs; 235 err = snd_usb_endpoint_start(ep); 236 if (err < 0) { 237 clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags); 238 return err; 239 } 240 } 241 242 if (subs->sync_endpoint && 243 !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) { 244 struct snd_usb_endpoint *ep = subs->sync_endpoint; 245 246 if (subs->data_endpoint->iface != subs->sync_endpoint->iface || 247 subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) { 248 err = usb_set_interface(subs->dev, 249 subs->sync_endpoint->iface, 250 subs->sync_endpoint->altsetting); 251 if (err < 0) { 252 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags); 253 dev_err(&subs->dev->dev, 254 "%d:%d: cannot set interface (%d)\n", 255 subs->sync_endpoint->iface, 256 subs->sync_endpoint->altsetting, err); 257 return -EIO; 258 } 259 } 260 261 dev_dbg(&subs->dev->dev, "Starting sync EP @%p\n", ep); 262 263 ep->sync_slave = subs->data_endpoint; 264 err = snd_usb_endpoint_start(ep); 265 if (err < 0) { 266 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags); 267 return err; 268 } 269 } 270 271 return 0; 272 } 273 274 static void stop_endpoints(struct snd_usb_substream *subs, bool wait) 275 { 276 if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) 277 snd_usb_endpoint_stop(subs->sync_endpoint); 278 279 if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) 280 snd_usb_endpoint_stop(subs->data_endpoint); 281 282 if (wait) { 283 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint); 284 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint); 285 } 286 } 287 288 static int search_roland_implicit_fb(struct usb_device *dev, int ifnum, 289 unsigned int altsetting, 290 struct usb_host_interface **alts, 291 unsigned int *ep) 292 { 293 struct usb_interface *iface; 294 struct usb_interface_descriptor *altsd; 295 struct usb_endpoint_descriptor *epd; 296 297 iface = usb_ifnum_to_if(dev, ifnum); 298 if (!iface || iface->num_altsetting < altsetting + 1) 299 return -ENOENT; 300 *alts = &iface->altsetting[altsetting]; 301 altsd = get_iface_desc(*alts); 302 if (altsd->bAlternateSetting != altsetting || 303 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC || 304 (altsd->bInterfaceSubClass != 2 && 305 altsd->bInterfaceProtocol != 2 ) || 306 altsd->bNumEndpoints < 1) 307 return -ENOENT; 308 epd = get_endpoint(*alts, 0); 309 if (!usb_endpoint_is_isoc_in(epd) || 310 (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) != 311 USB_ENDPOINT_USAGE_IMPLICIT_FB) 312 return -ENOENT; 313 *ep = epd->bEndpointAddress; 314 return 0; 315 } 316 317 static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs, 318 struct usb_device *dev, 319 struct usb_interface_descriptor *altsd, 320 unsigned int attr) 321 { 322 struct usb_host_interface *alts; 323 struct usb_interface *iface; 324 unsigned int ep; 325 unsigned int ifnum; 326 327 /* Implicit feedback sync EPs consumers are always playback EPs */ 328 if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK) 329 return 0; 330 331 switch (subs->stream->chip->usb_id) { 332 case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */ 333 case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */ 334 ep = 0x81; 335 ifnum = 3; 336 goto add_sync_ep_from_ifnum; 337 case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */ 338 case USB_ID(0x0763, 0x2081): 339 ep = 0x81; 340 ifnum = 2; 341 goto add_sync_ep_from_ifnum; 342 case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */ 343 ep = 0x86; 344 ifnum = 2; 345 goto add_sync_ep_from_ifnum; 346 case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx III */ 347 ep = 0x81; 348 ifnum = 2; 349 goto add_sync_ep_from_ifnum; 350 case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */ 351 ep = 0x81; 352 ifnum = 1; 353 goto add_sync_ep_from_ifnum; 354 } 355 356 if (attr == USB_ENDPOINT_SYNC_ASYNC && 357 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC && 358 altsd->bInterfaceProtocol == 2 && 359 altsd->bNumEndpoints == 1 && 360 USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ && 361 search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1, 362 altsd->bAlternateSetting, 363 &alts, &ep) >= 0) { 364 goto add_sync_ep; 365 } 366 367 /* No quirk */ 368 return 0; 369 370 add_sync_ep_from_ifnum: 371 iface = usb_ifnum_to_if(dev, ifnum); 372 373 if (!iface || iface->num_altsetting == 0) 374 return -EINVAL; 375 376 alts = &iface->altsetting[1]; 377 378 add_sync_ep: 379 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip, 380 alts, ep, !subs->direction, 381 SND_USB_ENDPOINT_TYPE_DATA); 382 if (!subs->sync_endpoint) 383 return -EINVAL; 384 385 subs->data_endpoint->sync_master = subs->sync_endpoint; 386 387 return 0; 388 } 389 390 static int set_sync_endpoint(struct snd_usb_substream *subs, 391 struct audioformat *fmt, 392 struct usb_device *dev, 393 struct usb_host_interface *alts, 394 struct usb_interface_descriptor *altsd) 395 { 396 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK; 397 unsigned int ep, attr; 398 bool implicit_fb; 399 int err; 400 401 /* we need a sync pipe in async OUT or adaptive IN mode */ 402 /* check the number of EP, since some devices have broken 403 * descriptors which fool us. if it has only one EP, 404 * assume it as adaptive-out or sync-in. 405 */ 406 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE; 407 408 if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) || 409 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) { 410 411 /* 412 * In these modes the notion of sync_endpoint is irrelevant. 413 * Reset pointers to avoid using stale data from previously 414 * used settings, e.g. when configuration and endpoints were 415 * changed 416 */ 417 418 subs->sync_endpoint = NULL; 419 subs->data_endpoint->sync_master = NULL; 420 } 421 422 err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr); 423 if (err < 0) 424 return err; 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 if (snd_usb_use_vmalloc) 780 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream, 781 params_buffer_bytes(hw_params)); 782 else 783 ret = snd_pcm_lib_malloc_pages(substream, 784 params_buffer_bytes(hw_params)); 785 if (ret < 0) 786 return ret; 787 788 subs->pcm_format = params_format(hw_params); 789 subs->period_bytes = params_period_bytes(hw_params); 790 subs->period_frames = params_period_size(hw_params); 791 subs->buffer_periods = params_periods(hw_params); 792 subs->channels = params_channels(hw_params); 793 subs->cur_rate = params_rate(hw_params); 794 795 fmt = find_format(subs); 796 if (!fmt) { 797 dev_dbg(&subs->dev->dev, 798 "cannot set format: format = %#x, rate = %d, channels = %d\n", 799 subs->pcm_format, subs->cur_rate, subs->channels); 800 return -EINVAL; 801 } 802 803 ret = snd_usb_lock_shutdown(subs->stream->chip); 804 if (ret < 0) 805 return ret; 806 807 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0); 808 if (ret < 0) 809 goto unlock; 810 811 ret = set_format(subs, fmt); 812 if (ret < 0) 813 goto unlock; 814 815 subs->interface = fmt->iface; 816 subs->altset_idx = fmt->altset_idx; 817 subs->need_setup_ep = true; 818 819 unlock: 820 snd_usb_unlock_shutdown(subs->stream->chip); 821 return ret; 822 } 823 824 /* 825 * hw_free callback 826 * 827 * reset the audio format and release the buffer 828 */ 829 static int snd_usb_hw_free(struct snd_pcm_substream *substream) 830 { 831 struct snd_usb_substream *subs = substream->runtime->private_data; 832 833 subs->cur_audiofmt = NULL; 834 subs->cur_rate = 0; 835 subs->period_bytes = 0; 836 if (!snd_usb_lock_shutdown(subs->stream->chip)) { 837 stop_endpoints(subs, true); 838 snd_usb_endpoint_deactivate(subs->sync_endpoint); 839 snd_usb_endpoint_deactivate(subs->data_endpoint); 840 snd_usb_unlock_shutdown(subs->stream->chip); 841 } 842 843 if (snd_usb_use_vmalloc) 844 return snd_pcm_lib_free_vmalloc_buffer(substream); 845 else 846 return snd_pcm_lib_free_pages(substream); 847 } 848 849 /* 850 * prepare callback 851 * 852 * only a few subtle things... 853 */ 854 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream) 855 { 856 struct snd_pcm_runtime *runtime = substream->runtime; 857 struct snd_usb_substream *subs = runtime->private_data; 858 struct usb_host_interface *alts; 859 struct usb_interface *iface; 860 int ret; 861 862 if (! subs->cur_audiofmt) { 863 dev_err(&subs->dev->dev, "no format is specified!\n"); 864 return -ENXIO; 865 } 866 867 ret = snd_usb_lock_shutdown(subs->stream->chip); 868 if (ret < 0) 869 return ret; 870 if (snd_BUG_ON(!subs->data_endpoint)) { 871 ret = -EIO; 872 goto unlock; 873 } 874 875 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint); 876 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint); 877 878 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0); 879 if (ret < 0) 880 goto unlock; 881 882 ret = set_format(subs, subs->cur_audiofmt); 883 if (ret < 0) 884 goto unlock; 885 886 if (subs->need_setup_ep) { 887 888 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface); 889 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx]; 890 ret = snd_usb_init_sample_rate(subs->stream->chip, 891 subs->cur_audiofmt->iface, 892 alts, 893 subs->cur_audiofmt, 894 subs->cur_rate); 895 if (ret < 0) 896 goto unlock; 897 898 ret = configure_endpoint(subs); 899 if (ret < 0) 900 goto unlock; 901 subs->need_setup_ep = false; 902 } 903 904 /* some unit conversions in runtime */ 905 subs->data_endpoint->maxframesize = 906 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize); 907 subs->data_endpoint->curframesize = 908 bytes_to_frames(runtime, subs->data_endpoint->curpacksize); 909 910 /* reset the pointer */ 911 subs->hwptr_done = 0; 912 subs->transfer_done = 0; 913 subs->last_delay = 0; 914 subs->last_frame_number = 0; 915 runtime->delay = 0; 916 917 /* for playback, submit the URBs now; otherwise, the first hwptr_done 918 * updates for all URBs would happen at the same time when starting */ 919 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) 920 ret = start_endpoints(subs); 921 922 unlock: 923 snd_usb_unlock_shutdown(subs->stream->chip); 924 return ret; 925 } 926 927 static const struct snd_pcm_hardware snd_usb_hardware = 928 { 929 .info = SNDRV_PCM_INFO_MMAP | 930 SNDRV_PCM_INFO_MMAP_VALID | 931 SNDRV_PCM_INFO_BATCH | 932 SNDRV_PCM_INFO_INTERLEAVED | 933 SNDRV_PCM_INFO_BLOCK_TRANSFER | 934 SNDRV_PCM_INFO_PAUSE, 935 .buffer_bytes_max = 1024 * 1024, 936 .period_bytes_min = 64, 937 .period_bytes_max = 512 * 1024, 938 .periods_min = 2, 939 .periods_max = 1024, 940 }; 941 942 static int hw_check_valid_format(struct snd_usb_substream *subs, 943 struct snd_pcm_hw_params *params, 944 struct audioformat *fp) 945 { 946 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 947 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 948 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 949 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME); 950 struct snd_mask check_fmts; 951 unsigned int ptime; 952 953 /* check the format */ 954 snd_mask_none(&check_fmts); 955 check_fmts.bits[0] = (u32)fp->formats; 956 check_fmts.bits[1] = (u32)(fp->formats >> 32); 957 snd_mask_intersect(&check_fmts, fmts); 958 if (snd_mask_empty(&check_fmts)) { 959 hwc_debug(" > check: no supported format %d\n", fp->format); 960 return 0; 961 } 962 /* check the channels */ 963 if (fp->channels < ct->min || fp->channels > ct->max) { 964 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max); 965 return 0; 966 } 967 /* check the rate is within the range */ 968 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) { 969 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max); 970 return 0; 971 } 972 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) { 973 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min); 974 return 0; 975 } 976 /* check whether the period time is >= the data packet interval */ 977 if (subs->speed != USB_SPEED_FULL) { 978 ptime = 125 * (1 << fp->datainterval); 979 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) { 980 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max); 981 return 0; 982 } 983 } 984 return 1; 985 } 986 987 static int hw_rule_rate(struct snd_pcm_hw_params *params, 988 struct snd_pcm_hw_rule *rule) 989 { 990 struct snd_usb_substream *subs = rule->private; 991 struct audioformat *fp; 992 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 993 unsigned int rmin, rmax; 994 int changed; 995 996 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max); 997 changed = 0; 998 rmin = rmax = 0; 999 list_for_each_entry(fp, &subs->fmt_list, list) { 1000 if (!hw_check_valid_format(subs, params, fp)) 1001 continue; 1002 if (changed++) { 1003 if (rmin > fp->rate_min) 1004 rmin = fp->rate_min; 1005 if (rmax < fp->rate_max) 1006 rmax = fp->rate_max; 1007 } else { 1008 rmin = fp->rate_min; 1009 rmax = fp->rate_max; 1010 } 1011 } 1012 1013 if (!changed) { 1014 hwc_debug(" --> get empty\n"); 1015 it->empty = 1; 1016 return -EINVAL; 1017 } 1018 1019 changed = 0; 1020 if (it->min < rmin) { 1021 it->min = rmin; 1022 it->openmin = 0; 1023 changed = 1; 1024 } 1025 if (it->max > rmax) { 1026 it->max = rmax; 1027 it->openmax = 0; 1028 changed = 1; 1029 } 1030 if (snd_interval_checkempty(it)) { 1031 it->empty = 1; 1032 return -EINVAL; 1033 } 1034 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed); 1035 return changed; 1036 } 1037 1038 1039 static int hw_rule_channels(struct snd_pcm_hw_params *params, 1040 struct snd_pcm_hw_rule *rule) 1041 { 1042 struct snd_usb_substream *subs = rule->private; 1043 struct audioformat *fp; 1044 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 1045 unsigned int rmin, rmax; 1046 int changed; 1047 1048 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max); 1049 changed = 0; 1050 rmin = rmax = 0; 1051 list_for_each_entry(fp, &subs->fmt_list, list) { 1052 if (!hw_check_valid_format(subs, params, fp)) 1053 continue; 1054 if (changed++) { 1055 if (rmin > fp->channels) 1056 rmin = fp->channels; 1057 if (rmax < fp->channels) 1058 rmax = fp->channels; 1059 } else { 1060 rmin = fp->channels; 1061 rmax = fp->channels; 1062 } 1063 } 1064 1065 if (!changed) { 1066 hwc_debug(" --> get empty\n"); 1067 it->empty = 1; 1068 return -EINVAL; 1069 } 1070 1071 changed = 0; 1072 if (it->min < rmin) { 1073 it->min = rmin; 1074 it->openmin = 0; 1075 changed = 1; 1076 } 1077 if (it->max > rmax) { 1078 it->max = rmax; 1079 it->openmax = 0; 1080 changed = 1; 1081 } 1082 if (snd_interval_checkempty(it)) { 1083 it->empty = 1; 1084 return -EINVAL; 1085 } 1086 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed); 1087 return changed; 1088 } 1089 1090 static int hw_rule_format(struct snd_pcm_hw_params *params, 1091 struct snd_pcm_hw_rule *rule) 1092 { 1093 struct snd_usb_substream *subs = rule->private; 1094 struct audioformat *fp; 1095 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 1096 u64 fbits; 1097 u32 oldbits[2]; 1098 int changed; 1099 1100 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]); 1101 fbits = 0; 1102 list_for_each_entry(fp, &subs->fmt_list, list) { 1103 if (!hw_check_valid_format(subs, params, fp)) 1104 continue; 1105 fbits |= fp->formats; 1106 } 1107 1108 oldbits[0] = fmt->bits[0]; 1109 oldbits[1] = fmt->bits[1]; 1110 fmt->bits[0] &= (u32)fbits; 1111 fmt->bits[1] &= (u32)(fbits >> 32); 1112 if (!fmt->bits[0] && !fmt->bits[1]) { 1113 hwc_debug(" --> get empty\n"); 1114 return -EINVAL; 1115 } 1116 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]); 1117 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed); 1118 return changed; 1119 } 1120 1121 static int hw_rule_period_time(struct snd_pcm_hw_params *params, 1122 struct snd_pcm_hw_rule *rule) 1123 { 1124 struct snd_usb_substream *subs = rule->private; 1125 struct audioformat *fp; 1126 struct snd_interval *it; 1127 unsigned char min_datainterval; 1128 unsigned int pmin; 1129 int changed; 1130 1131 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME); 1132 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max); 1133 min_datainterval = 0xff; 1134 list_for_each_entry(fp, &subs->fmt_list, list) { 1135 if (!hw_check_valid_format(subs, params, fp)) 1136 continue; 1137 min_datainterval = min(min_datainterval, fp->datainterval); 1138 } 1139 if (min_datainterval == 0xff) { 1140 hwc_debug(" --> get empty\n"); 1141 it->empty = 1; 1142 return -EINVAL; 1143 } 1144 pmin = 125 * (1 << min_datainterval); 1145 changed = 0; 1146 if (it->min < pmin) { 1147 it->min = pmin; 1148 it->openmin = 0; 1149 changed = 1; 1150 } 1151 if (snd_interval_checkempty(it)) { 1152 it->empty = 1; 1153 return -EINVAL; 1154 } 1155 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed); 1156 return changed; 1157 } 1158 1159 /* 1160 * If the device supports unusual bit rates, does the request meet these? 1161 */ 1162 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime, 1163 struct snd_usb_substream *subs) 1164 { 1165 struct audioformat *fp; 1166 int *rate_list; 1167 int count = 0, needs_knot = 0; 1168 int err; 1169 1170 kfree(subs->rate_list.list); 1171 subs->rate_list.list = NULL; 1172 1173 list_for_each_entry(fp, &subs->fmt_list, list) { 1174 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS) 1175 return 0; 1176 count += fp->nr_rates; 1177 if (fp->rates & SNDRV_PCM_RATE_KNOT) 1178 needs_knot = 1; 1179 } 1180 if (!needs_knot) 1181 return 0; 1182 1183 subs->rate_list.list = rate_list = 1184 kmalloc_array(count, sizeof(int), GFP_KERNEL); 1185 if (!subs->rate_list.list) 1186 return -ENOMEM; 1187 subs->rate_list.count = count; 1188 subs->rate_list.mask = 0; 1189 count = 0; 1190 list_for_each_entry(fp, &subs->fmt_list, list) { 1191 int i; 1192 for (i = 0; i < fp->nr_rates; i++) 1193 rate_list[count++] = fp->rate_table[i]; 1194 } 1195 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1196 &subs->rate_list); 1197 if (err < 0) 1198 return err; 1199 1200 return 0; 1201 } 1202 1203 1204 /* 1205 * set up the runtime hardware information. 1206 */ 1207 1208 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs) 1209 { 1210 struct audioformat *fp; 1211 unsigned int pt, ptmin; 1212 int param_period_time_if_needed; 1213 int err; 1214 1215 runtime->hw.formats = subs->formats; 1216 1217 runtime->hw.rate_min = 0x7fffffff; 1218 runtime->hw.rate_max = 0; 1219 runtime->hw.channels_min = 256; 1220 runtime->hw.channels_max = 0; 1221 runtime->hw.rates = 0; 1222 ptmin = UINT_MAX; 1223 /* check min/max rates and channels */ 1224 list_for_each_entry(fp, &subs->fmt_list, list) { 1225 runtime->hw.rates |= fp->rates; 1226 if (runtime->hw.rate_min > fp->rate_min) 1227 runtime->hw.rate_min = fp->rate_min; 1228 if (runtime->hw.rate_max < fp->rate_max) 1229 runtime->hw.rate_max = fp->rate_max; 1230 if (runtime->hw.channels_min > fp->channels) 1231 runtime->hw.channels_min = fp->channels; 1232 if (runtime->hw.channels_max < fp->channels) 1233 runtime->hw.channels_max = fp->channels; 1234 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) { 1235 /* FIXME: there might be more than one audio formats... */ 1236 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max = 1237 fp->frame_size; 1238 } 1239 pt = 125 * (1 << fp->datainterval); 1240 ptmin = min(ptmin, pt); 1241 } 1242 1243 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME; 1244 if (subs->speed == USB_SPEED_FULL) 1245 /* full speed devices have fixed data packet interval */ 1246 ptmin = 1000; 1247 if (ptmin == 1000) 1248 /* if period time doesn't go below 1 ms, no rules needed */ 1249 param_period_time_if_needed = -1; 1250 1251 err = snd_pcm_hw_constraint_minmax(runtime, 1252 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1253 ptmin, UINT_MAX); 1254 if (err < 0) 1255 return err; 1256 1257 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1258 hw_rule_rate, subs, 1259 SNDRV_PCM_HW_PARAM_FORMAT, 1260 SNDRV_PCM_HW_PARAM_CHANNELS, 1261 param_period_time_if_needed, 1262 -1); 1263 if (err < 0) 1264 return err; 1265 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 1266 hw_rule_channels, subs, 1267 SNDRV_PCM_HW_PARAM_FORMAT, 1268 SNDRV_PCM_HW_PARAM_RATE, 1269 param_period_time_if_needed, 1270 -1); 1271 if (err < 0) 1272 return err; 1273 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 1274 hw_rule_format, subs, 1275 SNDRV_PCM_HW_PARAM_RATE, 1276 SNDRV_PCM_HW_PARAM_CHANNELS, 1277 param_period_time_if_needed, 1278 -1); 1279 if (err < 0) 1280 return err; 1281 if (param_period_time_if_needed >= 0) { 1282 err = snd_pcm_hw_rule_add(runtime, 0, 1283 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1284 hw_rule_period_time, subs, 1285 SNDRV_PCM_HW_PARAM_FORMAT, 1286 SNDRV_PCM_HW_PARAM_CHANNELS, 1287 SNDRV_PCM_HW_PARAM_RATE, 1288 -1); 1289 if (err < 0) 1290 return err; 1291 } 1292 err = snd_usb_pcm_check_knot(runtime, subs); 1293 if (err < 0) 1294 return err; 1295 1296 return snd_usb_autoresume(subs->stream->chip); 1297 } 1298 1299 static int snd_usb_pcm_open(struct snd_pcm_substream *substream) 1300 { 1301 int direction = substream->stream; 1302 struct snd_usb_stream *as = snd_pcm_substream_chip(substream); 1303 struct snd_pcm_runtime *runtime = substream->runtime; 1304 struct snd_usb_substream *subs = &as->substream[direction]; 1305 1306 subs->interface = -1; 1307 subs->altset_idx = 0; 1308 runtime->hw = snd_usb_hardware; 1309 runtime->private_data = subs; 1310 subs->pcm_substream = substream; 1311 /* runtime PM is also done there */ 1312 1313 /* initialize DSD/DOP context */ 1314 subs->dsd_dop.byte_idx = 0; 1315 subs->dsd_dop.channel = 0; 1316 subs->dsd_dop.marker = 1; 1317 1318 return setup_hw_info(runtime, subs); 1319 } 1320 1321 static int snd_usb_pcm_close(struct snd_pcm_substream *substream) 1322 { 1323 int direction = substream->stream; 1324 struct snd_usb_stream *as = snd_pcm_substream_chip(substream); 1325 struct snd_usb_substream *subs = &as->substream[direction]; 1326 int ret; 1327 1328 stop_endpoints(subs, true); 1329 1330 if (!as->chip->keep_iface && 1331 subs->interface >= 0 && 1332 !snd_usb_lock_shutdown(subs->stream->chip)) { 1333 usb_set_interface(subs->dev, subs->interface, 0); 1334 subs->interface = -1; 1335 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1); 1336 snd_usb_unlock_shutdown(subs->stream->chip); 1337 if (ret < 0) 1338 return ret; 1339 } 1340 1341 subs->pcm_substream = NULL; 1342 snd_usb_autosuspend(subs->stream->chip); 1343 1344 return 0; 1345 } 1346 1347 /* Since a URB can handle only a single linear buffer, we must use double 1348 * buffering when the data to be transferred overflows the buffer boundary. 1349 * To avoid inconsistencies when updating hwptr_done, we use double buffering 1350 * for all URBs. 1351 */ 1352 static void retire_capture_urb(struct snd_usb_substream *subs, 1353 struct urb *urb) 1354 { 1355 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1356 unsigned int stride, frames, bytes, oldptr; 1357 int i, period_elapsed = 0; 1358 unsigned long flags; 1359 unsigned char *cp; 1360 int current_frame_number; 1361 1362 /* read frame number here, update pointer in critical section */ 1363 current_frame_number = usb_get_current_frame_number(subs->dev); 1364 1365 stride = runtime->frame_bits >> 3; 1366 1367 for (i = 0; i < urb->number_of_packets; i++) { 1368 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj; 1369 if (urb->iso_frame_desc[i].status && printk_ratelimit()) { 1370 dev_dbg(&subs->dev->dev, "frame %d active: %d\n", 1371 i, urb->iso_frame_desc[i].status); 1372 // continue; 1373 } 1374 bytes = urb->iso_frame_desc[i].actual_length; 1375 frames = bytes / stride; 1376 if (!subs->txfr_quirk) 1377 bytes = frames * stride; 1378 if (bytes % (runtime->sample_bits >> 3) != 0) { 1379 int oldbytes = bytes; 1380 bytes = frames * stride; 1381 dev_warn_ratelimited(&subs->dev->dev, 1382 "Corrected urb data len. %d->%d\n", 1383 oldbytes, bytes); 1384 } 1385 /* update the current pointer */ 1386 spin_lock_irqsave(&subs->lock, flags); 1387 oldptr = subs->hwptr_done; 1388 subs->hwptr_done += bytes; 1389 if (subs->hwptr_done >= runtime->buffer_size * stride) 1390 subs->hwptr_done -= runtime->buffer_size * stride; 1391 frames = (bytes + (oldptr % stride)) / stride; 1392 subs->transfer_done += frames; 1393 if (subs->transfer_done >= runtime->period_size) { 1394 subs->transfer_done -= runtime->period_size; 1395 period_elapsed = 1; 1396 } 1397 /* capture delay is by construction limited to one URB, 1398 * reset delays here 1399 */ 1400 runtime->delay = subs->last_delay = 0; 1401 1402 /* realign last_frame_number */ 1403 subs->last_frame_number = current_frame_number; 1404 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */ 1405 1406 spin_unlock_irqrestore(&subs->lock, flags); 1407 /* copy a data chunk */ 1408 if (oldptr + bytes > runtime->buffer_size * stride) { 1409 unsigned int bytes1 = 1410 runtime->buffer_size * stride - oldptr; 1411 memcpy(runtime->dma_area + oldptr, cp, bytes1); 1412 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1); 1413 } else { 1414 memcpy(runtime->dma_area + oldptr, cp, bytes); 1415 } 1416 } 1417 1418 if (period_elapsed) 1419 snd_pcm_period_elapsed(subs->pcm_substream); 1420 } 1421 1422 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs, 1423 struct urb *urb, unsigned int bytes) 1424 { 1425 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1426 unsigned int stride = runtime->frame_bits >> 3; 1427 unsigned int dst_idx = 0; 1428 unsigned int src_idx = subs->hwptr_done; 1429 unsigned int wrap = runtime->buffer_size * stride; 1430 u8 *dst = urb->transfer_buffer; 1431 u8 *src = runtime->dma_area; 1432 u8 marker[] = { 0x05, 0xfa }; 1433 1434 /* 1435 * The DSP DOP format defines a way to transport DSD samples over 1436 * normal PCM data endpoints. It requires stuffing of marker bytes 1437 * (0x05 and 0xfa, alternating per sample frame), and then expects 1438 * 2 additional bytes of actual payload. The whole frame is stored 1439 * LSB. 1440 * 1441 * Hence, for a stereo transport, the buffer layout looks like this, 1442 * where L refers to left channel samples and R to right. 1443 * 1444 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa 1445 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa 1446 * ..... 1447 * 1448 */ 1449 1450 while (bytes--) { 1451 if (++subs->dsd_dop.byte_idx == 3) { 1452 /* frame boundary? */ 1453 dst[dst_idx++] = marker[subs->dsd_dop.marker]; 1454 src_idx += 2; 1455 subs->dsd_dop.byte_idx = 0; 1456 1457 if (++subs->dsd_dop.channel % runtime->channels == 0) { 1458 /* alternate the marker */ 1459 subs->dsd_dop.marker++; 1460 subs->dsd_dop.marker %= ARRAY_SIZE(marker); 1461 subs->dsd_dop.channel = 0; 1462 } 1463 } else { 1464 /* stuff the DSD payload */ 1465 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap; 1466 1467 if (subs->cur_audiofmt->dsd_bitrev) 1468 dst[dst_idx++] = bitrev8(src[idx]); 1469 else 1470 dst[dst_idx++] = src[idx]; 1471 1472 subs->hwptr_done++; 1473 } 1474 } 1475 if (subs->hwptr_done >= runtime->buffer_size * stride) 1476 subs->hwptr_done -= runtime->buffer_size * stride; 1477 } 1478 1479 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb, 1480 int offset, int stride, unsigned int bytes) 1481 { 1482 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1483 1484 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) { 1485 /* err, the transferred area goes over buffer boundary. */ 1486 unsigned int bytes1 = 1487 runtime->buffer_size * stride - subs->hwptr_done; 1488 memcpy(urb->transfer_buffer + offset, 1489 runtime->dma_area + subs->hwptr_done, bytes1); 1490 memcpy(urb->transfer_buffer + offset + bytes1, 1491 runtime->dma_area, bytes - bytes1); 1492 } else { 1493 memcpy(urb->transfer_buffer + offset, 1494 runtime->dma_area + subs->hwptr_done, bytes); 1495 } 1496 subs->hwptr_done += bytes; 1497 if (subs->hwptr_done >= runtime->buffer_size * stride) 1498 subs->hwptr_done -= runtime->buffer_size * stride; 1499 } 1500 1501 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs, 1502 struct urb *urb, int stride, 1503 unsigned int bytes) 1504 { 1505 __le32 packet_length; 1506 int i; 1507 1508 /* Put __le32 length descriptor at start of each packet. */ 1509 for (i = 0; i < urb->number_of_packets; i++) { 1510 unsigned int length = urb->iso_frame_desc[i].length; 1511 unsigned int offset = urb->iso_frame_desc[i].offset; 1512 1513 packet_length = cpu_to_le32(length); 1514 offset += i * sizeof(packet_length); 1515 urb->iso_frame_desc[i].offset = offset; 1516 urb->iso_frame_desc[i].length += sizeof(packet_length); 1517 memcpy(urb->transfer_buffer + offset, 1518 &packet_length, sizeof(packet_length)); 1519 copy_to_urb(subs, urb, offset + sizeof(packet_length), 1520 stride, length); 1521 } 1522 /* Adjust transfer size accordingly. */ 1523 bytes += urb->number_of_packets * sizeof(packet_length); 1524 return bytes; 1525 } 1526 1527 static void prepare_playback_urb(struct snd_usb_substream *subs, 1528 struct urb *urb) 1529 { 1530 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1531 struct snd_usb_endpoint *ep = subs->data_endpoint; 1532 struct snd_urb_ctx *ctx = urb->context; 1533 unsigned int counts, frames, bytes; 1534 int i, stride, period_elapsed = 0; 1535 unsigned long flags; 1536 1537 stride = runtime->frame_bits >> 3; 1538 1539 frames = 0; 1540 urb->number_of_packets = 0; 1541 spin_lock_irqsave(&subs->lock, flags); 1542 subs->frame_limit += ep->max_urb_frames; 1543 for (i = 0; i < ctx->packets; i++) { 1544 if (ctx->packet_size[i]) 1545 counts = ctx->packet_size[i]; 1546 else 1547 counts = snd_usb_endpoint_next_packet_size(ep); 1548 1549 /* set up descriptor */ 1550 urb->iso_frame_desc[i].offset = frames * ep->stride; 1551 urb->iso_frame_desc[i].length = counts * ep->stride; 1552 frames += counts; 1553 urb->number_of_packets++; 1554 subs->transfer_done += counts; 1555 if (subs->transfer_done >= runtime->period_size) { 1556 subs->transfer_done -= runtime->period_size; 1557 subs->frame_limit = 0; 1558 period_elapsed = 1; 1559 if (subs->fmt_type == UAC_FORMAT_TYPE_II) { 1560 if (subs->transfer_done > 0) { 1561 /* FIXME: fill-max mode is not 1562 * supported yet */ 1563 frames -= subs->transfer_done; 1564 counts -= subs->transfer_done; 1565 urb->iso_frame_desc[i].length = 1566 counts * ep->stride; 1567 subs->transfer_done = 0; 1568 } 1569 i++; 1570 if (i < ctx->packets) { 1571 /* add a transfer delimiter */ 1572 urb->iso_frame_desc[i].offset = 1573 frames * ep->stride; 1574 urb->iso_frame_desc[i].length = 0; 1575 urb->number_of_packets++; 1576 } 1577 break; 1578 } 1579 } 1580 /* finish at the period boundary or after enough frames */ 1581 if ((period_elapsed || 1582 subs->transfer_done >= subs->frame_limit) && 1583 !snd_usb_endpoint_implicit_feedback_sink(ep)) 1584 break; 1585 } 1586 bytes = frames * ep->stride; 1587 1588 if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE && 1589 subs->cur_audiofmt->dsd_dop)) { 1590 fill_playback_urb_dsd_dop(subs, urb, bytes); 1591 } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 && 1592 subs->cur_audiofmt->dsd_bitrev)) { 1593 /* bit-reverse the bytes */ 1594 u8 *buf = urb->transfer_buffer; 1595 for (i = 0; i < bytes; i++) { 1596 int idx = (subs->hwptr_done + i) 1597 % (runtime->buffer_size * stride); 1598 buf[i] = bitrev8(runtime->dma_area[idx]); 1599 } 1600 1601 subs->hwptr_done += bytes; 1602 if (subs->hwptr_done >= runtime->buffer_size * stride) 1603 subs->hwptr_done -= runtime->buffer_size * stride; 1604 } else { 1605 /* usual PCM */ 1606 if (!subs->tx_length_quirk) 1607 copy_to_urb(subs, urb, 0, stride, bytes); 1608 else 1609 bytes = copy_to_urb_quirk(subs, urb, stride, bytes); 1610 /* bytes is now amount of outgoing data */ 1611 } 1612 1613 /* update delay with exact number of samples queued */ 1614 runtime->delay = subs->last_delay; 1615 runtime->delay += frames; 1616 subs->last_delay = runtime->delay; 1617 1618 /* realign last_frame_number */ 1619 subs->last_frame_number = usb_get_current_frame_number(subs->dev); 1620 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */ 1621 1622 if (subs->trigger_tstamp_pending_update) { 1623 /* this is the first actual URB submitted, 1624 * update trigger timestamp to reflect actual start time 1625 */ 1626 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 1627 subs->trigger_tstamp_pending_update = false; 1628 } 1629 1630 spin_unlock_irqrestore(&subs->lock, flags); 1631 urb->transfer_buffer_length = bytes; 1632 if (period_elapsed) 1633 snd_pcm_period_elapsed(subs->pcm_substream); 1634 } 1635 1636 /* 1637 * process after playback data complete 1638 * - decrease the delay count again 1639 */ 1640 static void retire_playback_urb(struct snd_usb_substream *subs, 1641 struct urb *urb) 1642 { 1643 unsigned long flags; 1644 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1645 struct snd_usb_endpoint *ep = subs->data_endpoint; 1646 int processed = urb->transfer_buffer_length / ep->stride; 1647 int est_delay; 1648 1649 /* ignore the delay accounting when procssed=0 is given, i.e. 1650 * silent payloads are procssed before handling the actual data 1651 */ 1652 if (!processed) 1653 return; 1654 1655 spin_lock_irqsave(&subs->lock, flags); 1656 if (!subs->last_delay) 1657 goto out; /* short path */ 1658 1659 est_delay = snd_usb_pcm_delay(subs, runtime->rate); 1660 /* update delay with exact number of samples played */ 1661 if (processed > subs->last_delay) 1662 subs->last_delay = 0; 1663 else 1664 subs->last_delay -= processed; 1665 runtime->delay = subs->last_delay; 1666 1667 /* 1668 * Report when delay estimate is off by more than 2ms. 1669 * The error should be lower than 2ms since the estimate relies 1670 * on two reads of a counter updated every ms. 1671 */ 1672 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2) 1673 dev_dbg_ratelimited(&subs->dev->dev, 1674 "delay: estimated %d, actual %d\n", 1675 est_delay, subs->last_delay); 1676 1677 if (!subs->running) { 1678 /* update last_frame_number for delay counting here since 1679 * prepare_playback_urb won't be called during pause 1680 */ 1681 subs->last_frame_number = 1682 usb_get_current_frame_number(subs->dev) & 0xff; 1683 } 1684 1685 out: 1686 spin_unlock_irqrestore(&subs->lock, flags); 1687 } 1688 1689 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream, 1690 int cmd) 1691 { 1692 struct snd_usb_substream *subs = substream->runtime->private_data; 1693 1694 switch (cmd) { 1695 case SNDRV_PCM_TRIGGER_START: 1696 subs->trigger_tstamp_pending_update = true; 1697 /* fall through */ 1698 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 1699 subs->data_endpoint->prepare_data_urb = prepare_playback_urb; 1700 subs->data_endpoint->retire_data_urb = retire_playback_urb; 1701 subs->running = 1; 1702 return 0; 1703 case SNDRV_PCM_TRIGGER_STOP: 1704 stop_endpoints(subs, false); 1705 subs->running = 0; 1706 return 0; 1707 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 1708 subs->data_endpoint->prepare_data_urb = NULL; 1709 /* keep retire_data_urb for delay calculation */ 1710 subs->data_endpoint->retire_data_urb = retire_playback_urb; 1711 subs->running = 0; 1712 return 0; 1713 } 1714 1715 return -EINVAL; 1716 } 1717 1718 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream, 1719 int cmd) 1720 { 1721 int err; 1722 struct snd_usb_substream *subs = substream->runtime->private_data; 1723 1724 switch (cmd) { 1725 case SNDRV_PCM_TRIGGER_START: 1726 err = start_endpoints(subs); 1727 if (err < 0) 1728 return err; 1729 1730 subs->data_endpoint->retire_data_urb = retire_capture_urb; 1731 subs->running = 1; 1732 return 0; 1733 case SNDRV_PCM_TRIGGER_STOP: 1734 stop_endpoints(subs, false); 1735 subs->running = 0; 1736 return 0; 1737 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 1738 subs->data_endpoint->retire_data_urb = NULL; 1739 subs->running = 0; 1740 return 0; 1741 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 1742 subs->data_endpoint->retire_data_urb = retire_capture_urb; 1743 subs->running = 1; 1744 return 0; 1745 } 1746 1747 return -EINVAL; 1748 } 1749 1750 static const struct snd_pcm_ops snd_usb_playback_ops = { 1751 .open = snd_usb_pcm_open, 1752 .close = snd_usb_pcm_close, 1753 .ioctl = snd_pcm_lib_ioctl, 1754 .hw_params = snd_usb_hw_params, 1755 .hw_free = snd_usb_hw_free, 1756 .prepare = snd_usb_pcm_prepare, 1757 .trigger = snd_usb_substream_playback_trigger, 1758 .pointer = snd_usb_pcm_pointer, 1759 .page = snd_pcm_lib_get_vmalloc_page, 1760 }; 1761 1762 static const struct snd_pcm_ops snd_usb_capture_ops = { 1763 .open = snd_usb_pcm_open, 1764 .close = snd_usb_pcm_close, 1765 .ioctl = snd_pcm_lib_ioctl, 1766 .hw_params = snd_usb_hw_params, 1767 .hw_free = snd_usb_hw_free, 1768 .prepare = snd_usb_pcm_prepare, 1769 .trigger = snd_usb_substream_capture_trigger, 1770 .pointer = snd_usb_pcm_pointer, 1771 .page = snd_pcm_lib_get_vmalloc_page, 1772 }; 1773 1774 static const struct snd_pcm_ops snd_usb_playback_dev_ops = { 1775 .open = snd_usb_pcm_open, 1776 .close = snd_usb_pcm_close, 1777 .ioctl = snd_pcm_lib_ioctl, 1778 .hw_params = snd_usb_hw_params, 1779 .hw_free = snd_usb_hw_free, 1780 .prepare = snd_usb_pcm_prepare, 1781 .trigger = snd_usb_substream_playback_trigger, 1782 .pointer = snd_usb_pcm_pointer, 1783 .page = snd_pcm_sgbuf_ops_page, 1784 }; 1785 1786 static const struct snd_pcm_ops snd_usb_capture_dev_ops = { 1787 .open = snd_usb_pcm_open, 1788 .close = snd_usb_pcm_close, 1789 .ioctl = snd_pcm_lib_ioctl, 1790 .hw_params = snd_usb_hw_params, 1791 .hw_free = snd_usb_hw_free, 1792 .prepare = snd_usb_pcm_prepare, 1793 .trigger = snd_usb_substream_capture_trigger, 1794 .pointer = snd_usb_pcm_pointer, 1795 .page = snd_pcm_sgbuf_ops_page, 1796 }; 1797 1798 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream) 1799 { 1800 const struct snd_pcm_ops *ops; 1801 1802 if (snd_usb_use_vmalloc) 1803 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ? 1804 &snd_usb_playback_ops : &snd_usb_capture_ops; 1805 else 1806 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ? 1807 &snd_usb_playback_dev_ops : &snd_usb_capture_dev_ops; 1808 snd_pcm_set_ops(pcm, stream, ops); 1809 } 1810 1811 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs) 1812 { 1813 struct snd_pcm *pcm = subs->stream->pcm; 1814 struct snd_pcm_substream *s = pcm->streams[subs->direction].substream; 1815 struct device *dev = subs->dev->bus->controller; 1816 1817 if (!snd_usb_use_vmalloc) 1818 snd_pcm_lib_preallocate_pages(s, SNDRV_DMA_TYPE_DEV_SG, 1819 dev, 64*1024, 512*1024); 1820 } 1821