1 /* 2 * This program is free software; you can redistribute it and/or modify 3 * it under the terms of the GNU General Public License as published by 4 * the Free Software Foundation; either version 2 of the License, or 5 * (at your option) any later version. 6 * 7 * This program is distributed in the hope that it will be useful, 8 * but WITHOUT ANY WARRANTY; without even the implied warranty of 9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 10 * GNU General Public License for more details. 11 * 12 * You should have received a copy of the GNU General Public License 13 * along with this program; if not, write to the Free Software 14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 15 */ 16 17 #include <linux/init.h> 18 #include <linux/slab.h> 19 #include <linux/bitrev.h> 20 #include <linux/ratelimit.h> 21 #include <linux/usb.h> 22 #include <linux/usb/audio.h> 23 #include <linux/usb/audio-v2.h> 24 25 #include <sound/core.h> 26 #include <sound/pcm.h> 27 #include <sound/pcm_params.h> 28 29 #include "usbaudio.h" 30 #include "card.h" 31 #include "quirks.h" 32 #include "debug.h" 33 #include "endpoint.h" 34 #include "helper.h" 35 #include "pcm.h" 36 #include "clock.h" 37 #include "power.h" 38 39 #define SUBSTREAM_FLAG_DATA_EP_STARTED 0 40 #define SUBSTREAM_FLAG_SYNC_EP_STARTED 1 41 42 /* return the estimated delay based on USB frame counters */ 43 snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs, 44 unsigned int rate) 45 { 46 int current_frame_number; 47 int frame_diff; 48 int est_delay; 49 50 if (!subs->last_delay) 51 return 0; /* short path */ 52 53 current_frame_number = usb_get_current_frame_number(subs->dev); 54 /* 55 * HCD implementations use different widths, use lower 8 bits. 56 * The delay will be managed up to 256ms, which is more than 57 * enough 58 */ 59 frame_diff = (current_frame_number - subs->last_frame_number) & 0xff; 60 61 /* Approximation based on number of samples per USB frame (ms), 62 some truncation for 44.1 but the estimate is good enough */ 63 est_delay = frame_diff * rate / 1000; 64 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) 65 est_delay = subs->last_delay - est_delay; 66 else 67 est_delay = subs->last_delay + est_delay; 68 69 if (est_delay < 0) 70 est_delay = 0; 71 return est_delay; 72 } 73 74 /* 75 * return the current pcm pointer. just based on the hwptr_done value. 76 */ 77 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream) 78 { 79 struct snd_usb_substream *subs; 80 unsigned int hwptr_done; 81 82 subs = (struct snd_usb_substream *)substream->runtime->private_data; 83 if (subs->stream->chip->shutdown) 84 return SNDRV_PCM_POS_XRUN; 85 spin_lock(&subs->lock); 86 hwptr_done = subs->hwptr_done; 87 substream->runtime->delay = snd_usb_pcm_delay(subs, 88 substream->runtime->rate); 89 spin_unlock(&subs->lock); 90 return hwptr_done / (substream->runtime->frame_bits >> 3); 91 } 92 93 /* 94 * find a matching audio format 95 */ 96 static struct audioformat *find_format(struct snd_usb_substream *subs) 97 { 98 struct audioformat *fp; 99 struct audioformat *found = NULL; 100 int cur_attr = 0, attr; 101 102 list_for_each_entry(fp, &subs->fmt_list, list) { 103 if (!(fp->formats & pcm_format_to_bits(subs->pcm_format))) 104 continue; 105 if (fp->channels != subs->channels) 106 continue; 107 if (subs->cur_rate < fp->rate_min || 108 subs->cur_rate > fp->rate_max) 109 continue; 110 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) { 111 unsigned int i; 112 for (i = 0; i < fp->nr_rates; i++) 113 if (fp->rate_table[i] == subs->cur_rate) 114 break; 115 if (i >= fp->nr_rates) 116 continue; 117 } 118 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE; 119 if (! found) { 120 found = fp; 121 cur_attr = attr; 122 continue; 123 } 124 /* avoid async out and adaptive in if the other method 125 * supports the same format. 126 * this is a workaround for the case like 127 * M-audio audiophile USB. 128 */ 129 if (attr != cur_attr) { 130 if ((attr == USB_ENDPOINT_SYNC_ASYNC && 131 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) || 132 (attr == USB_ENDPOINT_SYNC_ADAPTIVE && 133 subs->direction == SNDRV_PCM_STREAM_CAPTURE)) 134 continue; 135 if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC && 136 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) || 137 (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE && 138 subs->direction == SNDRV_PCM_STREAM_CAPTURE)) { 139 found = fp; 140 cur_attr = attr; 141 continue; 142 } 143 } 144 /* find the format with the largest max. packet size */ 145 if (fp->maxpacksize > found->maxpacksize) { 146 found = fp; 147 cur_attr = attr; 148 } 149 } 150 return found; 151 } 152 153 static int init_pitch_v1(struct snd_usb_audio *chip, int iface, 154 struct usb_host_interface *alts, 155 struct audioformat *fmt) 156 { 157 struct usb_device *dev = chip->dev; 158 unsigned int ep; 159 unsigned char data[1]; 160 int err; 161 162 ep = get_endpoint(alts, 0)->bEndpointAddress; 163 164 data[0] = 1; 165 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR, 166 USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT, 167 UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep, 168 data, sizeof(data))) < 0) { 169 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n", 170 dev->devnum, iface, ep); 171 return err; 172 } 173 174 return 0; 175 } 176 177 static int init_pitch_v2(struct snd_usb_audio *chip, int iface, 178 struct usb_host_interface *alts, 179 struct audioformat *fmt) 180 { 181 struct usb_device *dev = chip->dev; 182 unsigned char data[1]; 183 int err; 184 185 data[0] = 1; 186 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR, 187 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT, 188 UAC2_EP_CS_PITCH << 8, 0, 189 data, sizeof(data))) < 0) { 190 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH (v2)\n", 191 dev->devnum, iface, fmt->altsetting); 192 return err; 193 } 194 195 return 0; 196 } 197 198 /* 199 * initialize the pitch control and sample rate 200 */ 201 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface, 202 struct usb_host_interface *alts, 203 struct audioformat *fmt) 204 { 205 /* if endpoint doesn't have pitch control, bail out */ 206 if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL)) 207 return 0; 208 209 switch (fmt->protocol) { 210 case UAC_VERSION_1: 211 default: 212 return init_pitch_v1(chip, iface, alts, fmt); 213 214 case UAC_VERSION_2: 215 return init_pitch_v2(chip, iface, alts, fmt); 216 } 217 } 218 219 static int start_endpoints(struct snd_usb_substream *subs, bool can_sleep) 220 { 221 int err; 222 223 if (!subs->data_endpoint) 224 return -EINVAL; 225 226 if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) { 227 struct snd_usb_endpoint *ep = subs->data_endpoint; 228 229 snd_printdd(KERN_DEBUG "Starting data EP @%p\n", ep); 230 231 ep->data_subs = subs; 232 err = snd_usb_endpoint_start(ep, can_sleep); 233 if (err < 0) { 234 clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags); 235 return err; 236 } 237 } 238 239 if (subs->sync_endpoint && 240 !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) { 241 struct snd_usb_endpoint *ep = subs->sync_endpoint; 242 243 if (subs->data_endpoint->iface != subs->sync_endpoint->iface || 244 subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) { 245 err = usb_set_interface(subs->dev, 246 subs->sync_endpoint->iface, 247 subs->sync_endpoint->altsetting); 248 if (err < 0) { 249 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags); 250 snd_printk(KERN_ERR 251 "%d:%d:%d: cannot set interface (%d)\n", 252 subs->dev->devnum, 253 subs->sync_endpoint->iface, 254 subs->sync_endpoint->altsetting, err); 255 return -EIO; 256 } 257 } 258 259 snd_printdd(KERN_DEBUG "Starting sync EP @%p\n", ep); 260 261 ep->sync_slave = subs->data_endpoint; 262 err = snd_usb_endpoint_start(ep, can_sleep); 263 if (err < 0) { 264 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags); 265 return err; 266 } 267 } 268 269 return 0; 270 } 271 272 static void stop_endpoints(struct snd_usb_substream *subs, bool wait) 273 { 274 if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) 275 snd_usb_endpoint_stop(subs->sync_endpoint); 276 277 if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) 278 snd_usb_endpoint_stop(subs->data_endpoint); 279 280 if (wait) { 281 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint); 282 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint); 283 } 284 } 285 286 static int search_roland_implicit_fb(struct usb_device *dev, int ifnum, 287 unsigned int altsetting, 288 struct usb_host_interface **alts, 289 unsigned int *ep) 290 { 291 struct usb_interface *iface; 292 struct usb_interface_descriptor *altsd; 293 struct usb_endpoint_descriptor *epd; 294 295 iface = usb_ifnum_to_if(dev, ifnum); 296 if (!iface || iface->num_altsetting < altsetting + 1) 297 return -ENOENT; 298 *alts = &iface->altsetting[altsetting]; 299 altsd = get_iface_desc(*alts); 300 if (altsd->bAlternateSetting != altsetting || 301 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC || 302 (altsd->bInterfaceSubClass != 2 && 303 altsd->bInterfaceProtocol != 2 ) || 304 altsd->bNumEndpoints < 1) 305 return -ENOENT; 306 epd = get_endpoint(*alts, 0); 307 if (!usb_endpoint_is_isoc_in(epd) || 308 (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) != 309 USB_ENDPOINT_USAGE_IMPLICIT_FB) 310 return -ENOENT; 311 *ep = epd->bEndpointAddress; 312 return 0; 313 } 314 315 static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs, 316 struct usb_device *dev, 317 struct usb_interface_descriptor *altsd, 318 unsigned int attr) 319 { 320 struct usb_host_interface *alts; 321 struct usb_interface *iface; 322 unsigned int ep; 323 324 /* Implicit feedback sync EPs consumers are always playback EPs */ 325 if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK) 326 return 0; 327 328 switch (subs->stream->chip->usb_id) { 329 case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */ 330 case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */ 331 ep = 0x81; 332 iface = usb_ifnum_to_if(dev, 3); 333 334 if (!iface || iface->num_altsetting == 0) 335 return -EINVAL; 336 337 alts = &iface->altsetting[1]; 338 goto add_sync_ep; 339 break; 340 case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */ 341 case USB_ID(0x0763, 0x2081): 342 ep = 0x81; 343 iface = usb_ifnum_to_if(dev, 2); 344 345 if (!iface || iface->num_altsetting == 0) 346 return -EINVAL; 347 348 alts = &iface->altsetting[1]; 349 goto add_sync_ep; 350 } 351 if (attr == USB_ENDPOINT_SYNC_ASYNC && 352 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC && 353 altsd->bInterfaceProtocol == 2 && 354 altsd->bNumEndpoints == 1 && 355 USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ && 356 search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1, 357 altsd->bAlternateSetting, 358 &alts, &ep) >= 0) { 359 goto add_sync_ep; 360 } 361 362 /* No quirk */ 363 return 0; 364 365 add_sync_ep: 366 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip, 367 alts, ep, !subs->direction, 368 SND_USB_ENDPOINT_TYPE_DATA); 369 if (!subs->sync_endpoint) 370 return -EINVAL; 371 372 subs->data_endpoint->sync_master = subs->sync_endpoint; 373 374 return 0; 375 } 376 377 static int set_sync_endpoint(struct snd_usb_substream *subs, 378 struct audioformat *fmt, 379 struct usb_device *dev, 380 struct usb_host_interface *alts, 381 struct usb_interface_descriptor *altsd) 382 { 383 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK; 384 unsigned int ep, attr; 385 bool implicit_fb; 386 int err; 387 388 /* we need a sync pipe in async OUT or adaptive IN mode */ 389 /* check the number of EP, since some devices have broken 390 * descriptors which fool us. if it has only one EP, 391 * assume it as adaptive-out or sync-in. 392 */ 393 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE; 394 395 err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr); 396 if (err < 0) 397 return err; 398 399 if (altsd->bNumEndpoints < 2) 400 return 0; 401 402 if ((is_playback && attr != USB_ENDPOINT_SYNC_ASYNC) || 403 (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE)) 404 return 0; 405 406 /* check sync-pipe endpoint */ 407 /* ... and check descriptor size before accessing bSynchAddress 408 because there is a version of the SB Audigy 2 NX firmware lacking 409 the audio fields in the endpoint descriptors */ 410 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC || 411 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE && 412 get_endpoint(alts, 1)->bSynchAddress != 0)) { 413 snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n", 414 dev->devnum, fmt->iface, fmt->altsetting, 415 get_endpoint(alts, 1)->bmAttributes, 416 get_endpoint(alts, 1)->bLength, 417 get_endpoint(alts, 1)->bSynchAddress); 418 return -EINVAL; 419 } 420 ep = get_endpoint(alts, 1)->bEndpointAddress; 421 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE && 422 ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) || 423 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) { 424 snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n", 425 dev->devnum, fmt->iface, fmt->altsetting, 426 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress); 427 return -EINVAL; 428 } 429 430 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK) 431 == USB_ENDPOINT_USAGE_IMPLICIT_FB; 432 433 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip, 434 alts, ep, !subs->direction, 435 implicit_fb ? 436 SND_USB_ENDPOINT_TYPE_DATA : 437 SND_USB_ENDPOINT_TYPE_SYNC); 438 if (!subs->sync_endpoint) 439 return -EINVAL; 440 441 subs->data_endpoint->sync_master = subs->sync_endpoint; 442 443 return 0; 444 } 445 446 /* 447 * find a matching format and set up the interface 448 */ 449 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt) 450 { 451 struct usb_device *dev = subs->dev; 452 struct usb_host_interface *alts; 453 struct usb_interface_descriptor *altsd; 454 struct usb_interface *iface; 455 int err; 456 457 iface = usb_ifnum_to_if(dev, fmt->iface); 458 if (WARN_ON(!iface)) 459 return -EINVAL; 460 alts = &iface->altsetting[fmt->altset_idx]; 461 altsd = get_iface_desc(alts); 462 if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting)) 463 return -EINVAL; 464 465 if (fmt == subs->cur_audiofmt) 466 return 0; 467 468 /* close the old interface */ 469 if (subs->interface >= 0 && subs->interface != fmt->iface) { 470 err = usb_set_interface(subs->dev, subs->interface, 0); 471 if (err < 0) { 472 snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed (%d)\n", 473 dev->devnum, fmt->iface, fmt->altsetting, err); 474 return -EIO; 475 } 476 subs->interface = -1; 477 subs->altset_idx = 0; 478 } 479 480 /* set interface */ 481 if (subs->interface != fmt->iface || 482 subs->altset_idx != fmt->altset_idx) { 483 err = usb_set_interface(dev, fmt->iface, fmt->altsetting); 484 if (err < 0) { 485 snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed (%d)\n", 486 dev->devnum, fmt->iface, fmt->altsetting, err); 487 return -EIO; 488 } 489 snd_printdd(KERN_INFO "setting usb interface %d:%d\n", 490 fmt->iface, fmt->altsetting); 491 subs->interface = fmt->iface; 492 subs->altset_idx = fmt->altset_idx; 493 494 snd_usb_set_interface_quirk(dev); 495 } 496 497 subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip, 498 alts, fmt->endpoint, subs->direction, 499 SND_USB_ENDPOINT_TYPE_DATA); 500 501 if (!subs->data_endpoint) 502 return -EINVAL; 503 504 err = set_sync_endpoint(subs, fmt, dev, alts, altsd); 505 if (err < 0) 506 return err; 507 508 err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt); 509 if (err < 0) 510 return err; 511 512 subs->cur_audiofmt = fmt; 513 514 snd_usb_set_format_quirk(subs, fmt); 515 516 return 0; 517 } 518 519 /* 520 * Return the score of matching two audioformats. 521 * Veto the audioformat if: 522 * - It has no channels for some reason. 523 * - Requested PCM format is not supported. 524 * - Requested sample rate is not supported. 525 */ 526 static int match_endpoint_audioformats(struct audioformat *fp, 527 struct audioformat *match, int rate, 528 snd_pcm_format_t pcm_format) 529 { 530 int i; 531 int score = 0; 532 533 if (fp->channels < 1) { 534 snd_printdd("%s: (fmt @%p) no channels\n", __func__, fp); 535 return 0; 536 } 537 538 if (!(fp->formats & pcm_format_to_bits(pcm_format))) { 539 snd_printdd("%s: (fmt @%p) no match for format %d\n", __func__, 540 fp, pcm_format); 541 return 0; 542 } 543 544 for (i = 0; i < fp->nr_rates; i++) { 545 if (fp->rate_table[i] == rate) { 546 score++; 547 break; 548 } 549 } 550 if (!score) { 551 snd_printdd("%s: (fmt @%p) no match for rate %d\n", __func__, 552 fp, rate); 553 return 0; 554 } 555 556 if (fp->channels == match->channels) 557 score++; 558 559 snd_printdd("%s: (fmt @%p) score %d\n", __func__, fp, score); 560 561 return score; 562 } 563 564 /* 565 * Configure the sync ep using the rate and pcm format of the data ep. 566 */ 567 static int configure_sync_endpoint(struct snd_usb_substream *subs) 568 { 569 int ret; 570 struct audioformat *fp; 571 struct audioformat *sync_fp = NULL; 572 int cur_score = 0; 573 int sync_period_bytes = subs->period_bytes; 574 struct snd_usb_substream *sync_subs = 575 &subs->stream->substream[subs->direction ^ 1]; 576 577 if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA || 578 !subs->stream) 579 return snd_usb_endpoint_set_params(subs->sync_endpoint, 580 subs->pcm_format, 581 subs->channels, 582 subs->period_bytes, 583 0, 0, 584 subs->cur_rate, 585 subs->cur_audiofmt, 586 NULL); 587 588 /* Try to find the best matching audioformat. */ 589 list_for_each_entry(fp, &sync_subs->fmt_list, list) { 590 int score = match_endpoint_audioformats(fp, subs->cur_audiofmt, 591 subs->cur_rate, subs->pcm_format); 592 593 if (score > cur_score) { 594 sync_fp = fp; 595 cur_score = score; 596 } 597 } 598 599 if (unlikely(sync_fp == NULL)) { 600 snd_printk(KERN_ERR "%s: no valid audioformat for sync ep %x found\n", 601 __func__, sync_subs->ep_num); 602 return -EINVAL; 603 } 604 605 /* 606 * Recalculate the period bytes if channel number differ between 607 * data and sync ep audioformat. 608 */ 609 if (sync_fp->channels != subs->channels) { 610 sync_period_bytes = (subs->period_bytes / subs->channels) * 611 sync_fp->channels; 612 snd_printdd("%s: adjusted sync ep period bytes (%d -> %d)\n", 613 __func__, subs->period_bytes, sync_period_bytes); 614 } 615 616 ret = snd_usb_endpoint_set_params(subs->sync_endpoint, 617 subs->pcm_format, 618 sync_fp->channels, 619 sync_period_bytes, 620 0, 0, 621 subs->cur_rate, 622 sync_fp, 623 NULL); 624 625 return ret; 626 } 627 628 /* 629 * configure endpoint params 630 * 631 * called during initial setup and upon resume 632 */ 633 static int configure_endpoint(struct snd_usb_substream *subs) 634 { 635 int ret; 636 637 /* format changed */ 638 stop_endpoints(subs, true); 639 ret = snd_usb_endpoint_set_params(subs->data_endpoint, 640 subs->pcm_format, 641 subs->channels, 642 subs->period_bytes, 643 subs->period_frames, 644 subs->buffer_periods, 645 subs->cur_rate, 646 subs->cur_audiofmt, 647 subs->sync_endpoint); 648 if (ret < 0) 649 return ret; 650 651 if (subs->sync_endpoint) 652 ret = configure_sync_endpoint(subs); 653 654 return ret; 655 } 656 657 /* 658 * hw_params callback 659 * 660 * allocate a buffer and set the given audio format. 661 * 662 * so far we use a physically linear buffer although packetize transfer 663 * doesn't need a continuous area. 664 * if sg buffer is supported on the later version of alsa, we'll follow 665 * that. 666 */ 667 static int snd_usb_hw_params(struct snd_pcm_substream *substream, 668 struct snd_pcm_hw_params *hw_params) 669 { 670 struct snd_usb_substream *subs = substream->runtime->private_data; 671 struct audioformat *fmt; 672 int ret; 673 674 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream, 675 params_buffer_bytes(hw_params)); 676 if (ret < 0) 677 return ret; 678 679 subs->pcm_format = params_format(hw_params); 680 subs->period_bytes = params_period_bytes(hw_params); 681 subs->period_frames = params_period_size(hw_params); 682 subs->buffer_periods = params_periods(hw_params); 683 subs->channels = params_channels(hw_params); 684 subs->cur_rate = params_rate(hw_params); 685 686 fmt = find_format(subs); 687 if (!fmt) { 688 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n", 689 subs->pcm_format, subs->cur_rate, subs->channels); 690 return -EINVAL; 691 } 692 693 down_read(&subs->stream->chip->shutdown_rwsem); 694 if (subs->stream->chip->shutdown) 695 ret = -ENODEV; 696 else 697 ret = set_format(subs, fmt); 698 up_read(&subs->stream->chip->shutdown_rwsem); 699 if (ret < 0) 700 return ret; 701 702 subs->interface = fmt->iface; 703 subs->altset_idx = fmt->altset_idx; 704 subs->need_setup_ep = true; 705 706 return 0; 707 } 708 709 /* 710 * hw_free callback 711 * 712 * reset the audio format and release the buffer 713 */ 714 static int snd_usb_hw_free(struct snd_pcm_substream *substream) 715 { 716 struct snd_usb_substream *subs = substream->runtime->private_data; 717 718 subs->cur_audiofmt = NULL; 719 subs->cur_rate = 0; 720 subs->period_bytes = 0; 721 down_read(&subs->stream->chip->shutdown_rwsem); 722 if (!subs->stream->chip->shutdown) { 723 stop_endpoints(subs, true); 724 snd_usb_endpoint_deactivate(subs->sync_endpoint); 725 snd_usb_endpoint_deactivate(subs->data_endpoint); 726 } 727 up_read(&subs->stream->chip->shutdown_rwsem); 728 return snd_pcm_lib_free_vmalloc_buffer(substream); 729 } 730 731 /* 732 * prepare callback 733 * 734 * only a few subtle things... 735 */ 736 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream) 737 { 738 struct snd_pcm_runtime *runtime = substream->runtime; 739 struct snd_usb_substream *subs = runtime->private_data; 740 struct usb_host_interface *alts; 741 struct usb_interface *iface; 742 int ret; 743 744 if (! subs->cur_audiofmt) { 745 snd_printk(KERN_ERR "usbaudio: no format is specified!\n"); 746 return -ENXIO; 747 } 748 749 down_read(&subs->stream->chip->shutdown_rwsem); 750 if (subs->stream->chip->shutdown) { 751 ret = -ENODEV; 752 goto unlock; 753 } 754 if (snd_BUG_ON(!subs->data_endpoint)) { 755 ret = -EIO; 756 goto unlock; 757 } 758 759 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint); 760 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint); 761 762 ret = set_format(subs, subs->cur_audiofmt); 763 if (ret < 0) 764 goto unlock; 765 766 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface); 767 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx]; 768 ret = snd_usb_init_sample_rate(subs->stream->chip, 769 subs->cur_audiofmt->iface, 770 alts, 771 subs->cur_audiofmt, 772 subs->cur_rate); 773 if (ret < 0) 774 goto unlock; 775 776 if (subs->need_setup_ep) { 777 ret = configure_endpoint(subs); 778 if (ret < 0) 779 goto unlock; 780 subs->need_setup_ep = false; 781 } 782 783 /* some unit conversions in runtime */ 784 subs->data_endpoint->maxframesize = 785 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize); 786 subs->data_endpoint->curframesize = 787 bytes_to_frames(runtime, subs->data_endpoint->curpacksize); 788 789 /* reset the pointer */ 790 subs->hwptr_done = 0; 791 subs->transfer_done = 0; 792 subs->last_delay = 0; 793 subs->last_frame_number = 0; 794 runtime->delay = 0; 795 796 /* for playback, submit the URBs now; otherwise, the first hwptr_done 797 * updates for all URBs would happen at the same time when starting */ 798 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) 799 ret = start_endpoints(subs, true); 800 801 unlock: 802 up_read(&subs->stream->chip->shutdown_rwsem); 803 return ret; 804 } 805 806 static struct snd_pcm_hardware snd_usb_hardware = 807 { 808 .info = SNDRV_PCM_INFO_MMAP | 809 SNDRV_PCM_INFO_MMAP_VALID | 810 SNDRV_PCM_INFO_BATCH | 811 SNDRV_PCM_INFO_INTERLEAVED | 812 SNDRV_PCM_INFO_BLOCK_TRANSFER | 813 SNDRV_PCM_INFO_PAUSE, 814 .buffer_bytes_max = 1024 * 1024, 815 .period_bytes_min = 64, 816 .period_bytes_max = 512 * 1024, 817 .periods_min = 2, 818 .periods_max = 1024, 819 }; 820 821 static int hw_check_valid_format(struct snd_usb_substream *subs, 822 struct snd_pcm_hw_params *params, 823 struct audioformat *fp) 824 { 825 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 826 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 827 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 828 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME); 829 struct snd_mask check_fmts; 830 unsigned int ptime; 831 832 /* check the format */ 833 snd_mask_none(&check_fmts); 834 check_fmts.bits[0] = (u32)fp->formats; 835 check_fmts.bits[1] = (u32)(fp->formats >> 32); 836 snd_mask_intersect(&check_fmts, fmts); 837 if (snd_mask_empty(&check_fmts)) { 838 hwc_debug(" > check: no supported format %d\n", fp->format); 839 return 0; 840 } 841 /* check the channels */ 842 if (fp->channels < ct->min || fp->channels > ct->max) { 843 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max); 844 return 0; 845 } 846 /* check the rate is within the range */ 847 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) { 848 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max); 849 return 0; 850 } 851 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) { 852 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min); 853 return 0; 854 } 855 /* check whether the period time is >= the data packet interval */ 856 if (subs->speed != USB_SPEED_FULL) { 857 ptime = 125 * (1 << fp->datainterval); 858 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) { 859 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max); 860 return 0; 861 } 862 } 863 return 1; 864 } 865 866 static int hw_rule_rate(struct snd_pcm_hw_params *params, 867 struct snd_pcm_hw_rule *rule) 868 { 869 struct snd_usb_substream *subs = rule->private; 870 struct audioformat *fp; 871 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 872 unsigned int rmin, rmax; 873 int changed; 874 875 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max); 876 changed = 0; 877 rmin = rmax = 0; 878 list_for_each_entry(fp, &subs->fmt_list, list) { 879 if (!hw_check_valid_format(subs, params, fp)) 880 continue; 881 if (changed++) { 882 if (rmin > fp->rate_min) 883 rmin = fp->rate_min; 884 if (rmax < fp->rate_max) 885 rmax = fp->rate_max; 886 } else { 887 rmin = fp->rate_min; 888 rmax = fp->rate_max; 889 } 890 } 891 892 if (!changed) { 893 hwc_debug(" --> get empty\n"); 894 it->empty = 1; 895 return -EINVAL; 896 } 897 898 changed = 0; 899 if (it->min < rmin) { 900 it->min = rmin; 901 it->openmin = 0; 902 changed = 1; 903 } 904 if (it->max > rmax) { 905 it->max = rmax; 906 it->openmax = 0; 907 changed = 1; 908 } 909 if (snd_interval_checkempty(it)) { 910 it->empty = 1; 911 return -EINVAL; 912 } 913 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed); 914 return changed; 915 } 916 917 918 static int hw_rule_channels(struct snd_pcm_hw_params *params, 919 struct snd_pcm_hw_rule *rule) 920 { 921 struct snd_usb_substream *subs = rule->private; 922 struct audioformat *fp; 923 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 924 unsigned int rmin, rmax; 925 int changed; 926 927 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max); 928 changed = 0; 929 rmin = rmax = 0; 930 list_for_each_entry(fp, &subs->fmt_list, list) { 931 if (!hw_check_valid_format(subs, params, fp)) 932 continue; 933 if (changed++) { 934 if (rmin > fp->channels) 935 rmin = fp->channels; 936 if (rmax < fp->channels) 937 rmax = fp->channels; 938 } else { 939 rmin = fp->channels; 940 rmax = fp->channels; 941 } 942 } 943 944 if (!changed) { 945 hwc_debug(" --> get empty\n"); 946 it->empty = 1; 947 return -EINVAL; 948 } 949 950 changed = 0; 951 if (it->min < rmin) { 952 it->min = rmin; 953 it->openmin = 0; 954 changed = 1; 955 } 956 if (it->max > rmax) { 957 it->max = rmax; 958 it->openmax = 0; 959 changed = 1; 960 } 961 if (snd_interval_checkempty(it)) { 962 it->empty = 1; 963 return -EINVAL; 964 } 965 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed); 966 return changed; 967 } 968 969 static int hw_rule_format(struct snd_pcm_hw_params *params, 970 struct snd_pcm_hw_rule *rule) 971 { 972 struct snd_usb_substream *subs = rule->private; 973 struct audioformat *fp; 974 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 975 u64 fbits; 976 u32 oldbits[2]; 977 int changed; 978 979 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]); 980 fbits = 0; 981 list_for_each_entry(fp, &subs->fmt_list, list) { 982 if (!hw_check_valid_format(subs, params, fp)) 983 continue; 984 fbits |= fp->formats; 985 } 986 987 oldbits[0] = fmt->bits[0]; 988 oldbits[1] = fmt->bits[1]; 989 fmt->bits[0] &= (u32)fbits; 990 fmt->bits[1] &= (u32)(fbits >> 32); 991 if (!fmt->bits[0] && !fmt->bits[1]) { 992 hwc_debug(" --> get empty\n"); 993 return -EINVAL; 994 } 995 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]); 996 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed); 997 return changed; 998 } 999 1000 static int hw_rule_period_time(struct snd_pcm_hw_params *params, 1001 struct snd_pcm_hw_rule *rule) 1002 { 1003 struct snd_usb_substream *subs = rule->private; 1004 struct audioformat *fp; 1005 struct snd_interval *it; 1006 unsigned char min_datainterval; 1007 unsigned int pmin; 1008 int changed; 1009 1010 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME); 1011 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max); 1012 min_datainterval = 0xff; 1013 list_for_each_entry(fp, &subs->fmt_list, list) { 1014 if (!hw_check_valid_format(subs, params, fp)) 1015 continue; 1016 min_datainterval = min(min_datainterval, fp->datainterval); 1017 } 1018 if (min_datainterval == 0xff) { 1019 hwc_debug(" --> get empty\n"); 1020 it->empty = 1; 1021 return -EINVAL; 1022 } 1023 pmin = 125 * (1 << min_datainterval); 1024 changed = 0; 1025 if (it->min < pmin) { 1026 it->min = pmin; 1027 it->openmin = 0; 1028 changed = 1; 1029 } 1030 if (snd_interval_checkempty(it)) { 1031 it->empty = 1; 1032 return -EINVAL; 1033 } 1034 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed); 1035 return changed; 1036 } 1037 1038 /* 1039 * If the device supports unusual bit rates, does the request meet these? 1040 */ 1041 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime, 1042 struct snd_usb_substream *subs) 1043 { 1044 struct audioformat *fp; 1045 int *rate_list; 1046 int count = 0, needs_knot = 0; 1047 int err; 1048 1049 kfree(subs->rate_list.list); 1050 subs->rate_list.list = NULL; 1051 1052 list_for_each_entry(fp, &subs->fmt_list, list) { 1053 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS) 1054 return 0; 1055 count += fp->nr_rates; 1056 if (fp->rates & SNDRV_PCM_RATE_KNOT) 1057 needs_knot = 1; 1058 } 1059 if (!needs_knot) 1060 return 0; 1061 1062 subs->rate_list.list = rate_list = 1063 kmalloc(sizeof(int) * count, GFP_KERNEL); 1064 if (!subs->rate_list.list) 1065 return -ENOMEM; 1066 subs->rate_list.count = count; 1067 subs->rate_list.mask = 0; 1068 count = 0; 1069 list_for_each_entry(fp, &subs->fmt_list, list) { 1070 int i; 1071 for (i = 0; i < fp->nr_rates; i++) 1072 rate_list[count++] = fp->rate_table[i]; 1073 } 1074 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1075 &subs->rate_list); 1076 if (err < 0) 1077 return err; 1078 1079 return 0; 1080 } 1081 1082 1083 /* 1084 * set up the runtime hardware information. 1085 */ 1086 1087 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs) 1088 { 1089 struct audioformat *fp; 1090 unsigned int pt, ptmin; 1091 int param_period_time_if_needed; 1092 int err; 1093 1094 runtime->hw.formats = subs->formats; 1095 1096 runtime->hw.rate_min = 0x7fffffff; 1097 runtime->hw.rate_max = 0; 1098 runtime->hw.channels_min = 256; 1099 runtime->hw.channels_max = 0; 1100 runtime->hw.rates = 0; 1101 ptmin = UINT_MAX; 1102 /* check min/max rates and channels */ 1103 list_for_each_entry(fp, &subs->fmt_list, list) { 1104 runtime->hw.rates |= fp->rates; 1105 if (runtime->hw.rate_min > fp->rate_min) 1106 runtime->hw.rate_min = fp->rate_min; 1107 if (runtime->hw.rate_max < fp->rate_max) 1108 runtime->hw.rate_max = fp->rate_max; 1109 if (runtime->hw.channels_min > fp->channels) 1110 runtime->hw.channels_min = fp->channels; 1111 if (runtime->hw.channels_max < fp->channels) 1112 runtime->hw.channels_max = fp->channels; 1113 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) { 1114 /* FIXME: there might be more than one audio formats... */ 1115 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max = 1116 fp->frame_size; 1117 } 1118 pt = 125 * (1 << fp->datainterval); 1119 ptmin = min(ptmin, pt); 1120 } 1121 err = snd_usb_autoresume(subs->stream->chip); 1122 if (err < 0) 1123 return err; 1124 1125 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME; 1126 if (subs->speed == USB_SPEED_FULL) 1127 /* full speed devices have fixed data packet interval */ 1128 ptmin = 1000; 1129 if (ptmin == 1000) 1130 /* if period time doesn't go below 1 ms, no rules needed */ 1131 param_period_time_if_needed = -1; 1132 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1133 ptmin, UINT_MAX); 1134 1135 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1136 hw_rule_rate, subs, 1137 SNDRV_PCM_HW_PARAM_FORMAT, 1138 SNDRV_PCM_HW_PARAM_CHANNELS, 1139 param_period_time_if_needed, 1140 -1)) < 0) 1141 goto rep_err; 1142 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 1143 hw_rule_channels, subs, 1144 SNDRV_PCM_HW_PARAM_FORMAT, 1145 SNDRV_PCM_HW_PARAM_RATE, 1146 param_period_time_if_needed, 1147 -1)) < 0) 1148 goto rep_err; 1149 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 1150 hw_rule_format, subs, 1151 SNDRV_PCM_HW_PARAM_RATE, 1152 SNDRV_PCM_HW_PARAM_CHANNELS, 1153 param_period_time_if_needed, 1154 -1)) < 0) 1155 goto rep_err; 1156 if (param_period_time_if_needed >= 0) { 1157 err = snd_pcm_hw_rule_add(runtime, 0, 1158 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1159 hw_rule_period_time, subs, 1160 SNDRV_PCM_HW_PARAM_FORMAT, 1161 SNDRV_PCM_HW_PARAM_CHANNELS, 1162 SNDRV_PCM_HW_PARAM_RATE, 1163 -1); 1164 if (err < 0) 1165 goto rep_err; 1166 } 1167 if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0) 1168 goto rep_err; 1169 return 0; 1170 1171 rep_err: 1172 snd_usb_autosuspend(subs->stream->chip); 1173 return err; 1174 } 1175 1176 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction) 1177 { 1178 struct snd_usb_stream *as = snd_pcm_substream_chip(substream); 1179 struct snd_pcm_runtime *runtime = substream->runtime; 1180 struct snd_usb_substream *subs = &as->substream[direction]; 1181 1182 subs->interface = -1; 1183 subs->altset_idx = 0; 1184 runtime->hw = snd_usb_hardware; 1185 runtime->private_data = subs; 1186 subs->pcm_substream = substream; 1187 /* runtime PM is also done there */ 1188 1189 /* initialize DSD/DOP context */ 1190 subs->dsd_dop.byte_idx = 0; 1191 subs->dsd_dop.channel = 0; 1192 subs->dsd_dop.marker = 1; 1193 1194 return setup_hw_info(runtime, subs); 1195 } 1196 1197 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction) 1198 { 1199 struct snd_usb_stream *as = snd_pcm_substream_chip(substream); 1200 struct snd_usb_substream *subs = &as->substream[direction]; 1201 1202 stop_endpoints(subs, true); 1203 1204 if (!as->chip->shutdown && subs->interface >= 0) { 1205 usb_set_interface(subs->dev, subs->interface, 0); 1206 subs->interface = -1; 1207 } 1208 1209 subs->pcm_substream = NULL; 1210 snd_usb_autosuspend(subs->stream->chip); 1211 1212 return 0; 1213 } 1214 1215 /* Since a URB can handle only a single linear buffer, we must use double 1216 * buffering when the data to be transferred overflows the buffer boundary. 1217 * To avoid inconsistencies when updating hwptr_done, we use double buffering 1218 * for all URBs. 1219 */ 1220 static void retire_capture_urb(struct snd_usb_substream *subs, 1221 struct urb *urb) 1222 { 1223 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1224 unsigned int stride, frames, bytes, oldptr; 1225 int i, period_elapsed = 0; 1226 unsigned long flags; 1227 unsigned char *cp; 1228 int current_frame_number; 1229 1230 /* read frame number here, update pointer in critical section */ 1231 current_frame_number = usb_get_current_frame_number(subs->dev); 1232 1233 stride = runtime->frame_bits >> 3; 1234 1235 for (i = 0; i < urb->number_of_packets; i++) { 1236 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj; 1237 if (urb->iso_frame_desc[i].status && printk_ratelimit()) { 1238 snd_printdd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status); 1239 // continue; 1240 } 1241 bytes = urb->iso_frame_desc[i].actual_length; 1242 frames = bytes / stride; 1243 if (!subs->txfr_quirk) 1244 bytes = frames * stride; 1245 if (bytes % (runtime->sample_bits >> 3) != 0) { 1246 int oldbytes = bytes; 1247 bytes = frames * stride; 1248 snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n", 1249 oldbytes, bytes); 1250 } 1251 /* update the current pointer */ 1252 spin_lock_irqsave(&subs->lock, flags); 1253 oldptr = subs->hwptr_done; 1254 subs->hwptr_done += bytes; 1255 if (subs->hwptr_done >= runtime->buffer_size * stride) 1256 subs->hwptr_done -= runtime->buffer_size * stride; 1257 frames = (bytes + (oldptr % stride)) / stride; 1258 subs->transfer_done += frames; 1259 if (subs->transfer_done >= runtime->period_size) { 1260 subs->transfer_done -= runtime->period_size; 1261 period_elapsed = 1; 1262 } 1263 /* capture delay is by construction limited to one URB, 1264 * reset delays here 1265 */ 1266 runtime->delay = subs->last_delay = 0; 1267 1268 /* realign last_frame_number */ 1269 subs->last_frame_number = current_frame_number; 1270 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */ 1271 1272 spin_unlock_irqrestore(&subs->lock, flags); 1273 /* copy a data chunk */ 1274 if (oldptr + bytes > runtime->buffer_size * stride) { 1275 unsigned int bytes1 = 1276 runtime->buffer_size * stride - oldptr; 1277 memcpy(runtime->dma_area + oldptr, cp, bytes1); 1278 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1); 1279 } else { 1280 memcpy(runtime->dma_area + oldptr, cp, bytes); 1281 } 1282 } 1283 1284 if (period_elapsed) 1285 snd_pcm_period_elapsed(subs->pcm_substream); 1286 } 1287 1288 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs, 1289 struct urb *urb, unsigned int bytes) 1290 { 1291 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1292 unsigned int stride = runtime->frame_bits >> 3; 1293 unsigned int dst_idx = 0; 1294 unsigned int src_idx = subs->hwptr_done; 1295 unsigned int wrap = runtime->buffer_size * stride; 1296 u8 *dst = urb->transfer_buffer; 1297 u8 *src = runtime->dma_area; 1298 u8 marker[] = { 0x05, 0xfa }; 1299 1300 /* 1301 * The DSP DOP format defines a way to transport DSD samples over 1302 * normal PCM data endpoints. It requires stuffing of marker bytes 1303 * (0x05 and 0xfa, alternating per sample frame), and then expects 1304 * 2 additional bytes of actual payload. The whole frame is stored 1305 * LSB. 1306 * 1307 * Hence, for a stereo transport, the buffer layout looks like this, 1308 * where L refers to left channel samples and R to right. 1309 * 1310 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa 1311 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa 1312 * ..... 1313 * 1314 */ 1315 1316 while (bytes--) { 1317 if (++subs->dsd_dop.byte_idx == 3) { 1318 /* frame boundary? */ 1319 dst[dst_idx++] = marker[subs->dsd_dop.marker]; 1320 src_idx += 2; 1321 subs->dsd_dop.byte_idx = 0; 1322 1323 if (++subs->dsd_dop.channel % runtime->channels == 0) { 1324 /* alternate the marker */ 1325 subs->dsd_dop.marker++; 1326 subs->dsd_dop.marker %= ARRAY_SIZE(marker); 1327 subs->dsd_dop.channel = 0; 1328 } 1329 } else { 1330 /* stuff the DSD payload */ 1331 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap; 1332 1333 if (subs->cur_audiofmt->dsd_bitrev) 1334 dst[dst_idx++] = bitrev8(src[idx]); 1335 else 1336 dst[dst_idx++] = src[idx]; 1337 1338 subs->hwptr_done++; 1339 } 1340 } 1341 } 1342 1343 static void prepare_playback_urb(struct snd_usb_substream *subs, 1344 struct urb *urb) 1345 { 1346 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1347 struct snd_usb_endpoint *ep = subs->data_endpoint; 1348 struct snd_urb_ctx *ctx = urb->context; 1349 unsigned int counts, frames, bytes; 1350 int i, stride, period_elapsed = 0; 1351 unsigned long flags; 1352 1353 stride = runtime->frame_bits >> 3; 1354 1355 frames = 0; 1356 urb->number_of_packets = 0; 1357 spin_lock_irqsave(&subs->lock, flags); 1358 subs->frame_limit += ep->max_urb_frames; 1359 for (i = 0; i < ctx->packets; i++) { 1360 if (ctx->packet_size[i]) 1361 counts = ctx->packet_size[i]; 1362 else 1363 counts = snd_usb_endpoint_next_packet_size(ep); 1364 1365 /* set up descriptor */ 1366 urb->iso_frame_desc[i].offset = frames * ep->stride; 1367 urb->iso_frame_desc[i].length = counts * ep->stride; 1368 frames += counts; 1369 urb->number_of_packets++; 1370 subs->transfer_done += counts; 1371 if (subs->transfer_done >= runtime->period_size) { 1372 subs->transfer_done -= runtime->period_size; 1373 subs->frame_limit = 0; 1374 period_elapsed = 1; 1375 if (subs->fmt_type == UAC_FORMAT_TYPE_II) { 1376 if (subs->transfer_done > 0) { 1377 /* FIXME: fill-max mode is not 1378 * supported yet */ 1379 frames -= subs->transfer_done; 1380 counts -= subs->transfer_done; 1381 urb->iso_frame_desc[i].length = 1382 counts * ep->stride; 1383 subs->transfer_done = 0; 1384 } 1385 i++; 1386 if (i < ctx->packets) { 1387 /* add a transfer delimiter */ 1388 urb->iso_frame_desc[i].offset = 1389 frames * ep->stride; 1390 urb->iso_frame_desc[i].length = 0; 1391 urb->number_of_packets++; 1392 } 1393 break; 1394 } 1395 } 1396 /* finish at the period boundary or after enough frames */ 1397 if ((period_elapsed || 1398 subs->transfer_done >= subs->frame_limit) && 1399 !snd_usb_endpoint_implicit_feedback_sink(ep)) 1400 break; 1401 } 1402 bytes = frames * ep->stride; 1403 1404 if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE && 1405 subs->cur_audiofmt->dsd_dop)) { 1406 fill_playback_urb_dsd_dop(subs, urb, bytes); 1407 } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 && 1408 subs->cur_audiofmt->dsd_bitrev)) { 1409 /* bit-reverse the bytes */ 1410 u8 *buf = urb->transfer_buffer; 1411 for (i = 0; i < bytes; i++) { 1412 int idx = (subs->hwptr_done + i) 1413 % (runtime->buffer_size * stride); 1414 buf[i] = bitrev8(runtime->dma_area[idx]); 1415 } 1416 1417 subs->hwptr_done += bytes; 1418 } else { 1419 /* usual PCM */ 1420 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) { 1421 /* err, the transferred area goes over buffer boundary. */ 1422 unsigned int bytes1 = 1423 runtime->buffer_size * stride - subs->hwptr_done; 1424 memcpy(urb->transfer_buffer, 1425 runtime->dma_area + subs->hwptr_done, bytes1); 1426 memcpy(urb->transfer_buffer + bytes1, 1427 runtime->dma_area, bytes - bytes1); 1428 } else { 1429 memcpy(urb->transfer_buffer, 1430 runtime->dma_area + subs->hwptr_done, bytes); 1431 } 1432 1433 subs->hwptr_done += bytes; 1434 } 1435 1436 if (subs->hwptr_done >= runtime->buffer_size * stride) 1437 subs->hwptr_done -= runtime->buffer_size * stride; 1438 1439 /* update delay with exact number of samples queued */ 1440 runtime->delay = subs->last_delay; 1441 runtime->delay += frames; 1442 subs->last_delay = runtime->delay; 1443 1444 /* realign last_frame_number */ 1445 subs->last_frame_number = usb_get_current_frame_number(subs->dev); 1446 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */ 1447 1448 spin_unlock_irqrestore(&subs->lock, flags); 1449 urb->transfer_buffer_length = bytes; 1450 if (period_elapsed) 1451 snd_pcm_period_elapsed(subs->pcm_substream); 1452 } 1453 1454 /* 1455 * process after playback data complete 1456 * - decrease the delay count again 1457 */ 1458 static void retire_playback_urb(struct snd_usb_substream *subs, 1459 struct urb *urb) 1460 { 1461 unsigned long flags; 1462 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1463 struct snd_usb_endpoint *ep = subs->data_endpoint; 1464 int processed = urb->transfer_buffer_length / ep->stride; 1465 int est_delay; 1466 1467 /* ignore the delay accounting when procssed=0 is given, i.e. 1468 * silent payloads are procssed before handling the actual data 1469 */ 1470 if (!processed) 1471 return; 1472 1473 spin_lock_irqsave(&subs->lock, flags); 1474 if (!subs->last_delay) 1475 goto out; /* short path */ 1476 1477 est_delay = snd_usb_pcm_delay(subs, runtime->rate); 1478 /* update delay with exact number of samples played */ 1479 if (processed > subs->last_delay) 1480 subs->last_delay = 0; 1481 else 1482 subs->last_delay -= processed; 1483 runtime->delay = subs->last_delay; 1484 1485 /* 1486 * Report when delay estimate is off by more than 2ms. 1487 * The error should be lower than 2ms since the estimate relies 1488 * on two reads of a counter updated every ms. 1489 */ 1490 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2) 1491 snd_printk(KERN_DEBUG "delay: estimated %d, actual %d\n", 1492 est_delay, subs->last_delay); 1493 1494 if (!subs->running) { 1495 /* update last_frame_number for delay counting here since 1496 * prepare_playback_urb won't be called during pause 1497 */ 1498 subs->last_frame_number = 1499 usb_get_current_frame_number(subs->dev) & 0xff; 1500 } 1501 1502 out: 1503 spin_unlock_irqrestore(&subs->lock, flags); 1504 } 1505 1506 static int snd_usb_playback_open(struct snd_pcm_substream *substream) 1507 { 1508 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK); 1509 } 1510 1511 static int snd_usb_playback_close(struct snd_pcm_substream *substream) 1512 { 1513 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK); 1514 } 1515 1516 static int snd_usb_capture_open(struct snd_pcm_substream *substream) 1517 { 1518 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE); 1519 } 1520 1521 static int snd_usb_capture_close(struct snd_pcm_substream *substream) 1522 { 1523 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE); 1524 } 1525 1526 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream, 1527 int cmd) 1528 { 1529 struct snd_usb_substream *subs = substream->runtime->private_data; 1530 1531 switch (cmd) { 1532 case SNDRV_PCM_TRIGGER_START: 1533 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 1534 subs->data_endpoint->prepare_data_urb = prepare_playback_urb; 1535 subs->data_endpoint->retire_data_urb = retire_playback_urb; 1536 subs->running = 1; 1537 return 0; 1538 case SNDRV_PCM_TRIGGER_STOP: 1539 stop_endpoints(subs, false); 1540 subs->running = 0; 1541 return 0; 1542 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 1543 subs->data_endpoint->prepare_data_urb = NULL; 1544 /* keep retire_data_urb for delay calculation */ 1545 subs->data_endpoint->retire_data_urb = retire_playback_urb; 1546 subs->running = 0; 1547 return 0; 1548 } 1549 1550 return -EINVAL; 1551 } 1552 1553 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream, 1554 int cmd) 1555 { 1556 int err; 1557 struct snd_usb_substream *subs = substream->runtime->private_data; 1558 1559 switch (cmd) { 1560 case SNDRV_PCM_TRIGGER_START: 1561 err = start_endpoints(subs, false); 1562 if (err < 0) 1563 return err; 1564 1565 subs->data_endpoint->retire_data_urb = retire_capture_urb; 1566 subs->running = 1; 1567 return 0; 1568 case SNDRV_PCM_TRIGGER_STOP: 1569 stop_endpoints(subs, false); 1570 subs->running = 0; 1571 return 0; 1572 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 1573 subs->data_endpoint->retire_data_urb = NULL; 1574 subs->running = 0; 1575 return 0; 1576 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 1577 subs->data_endpoint->retire_data_urb = retire_capture_urb; 1578 subs->running = 1; 1579 return 0; 1580 } 1581 1582 return -EINVAL; 1583 } 1584 1585 static struct snd_pcm_ops snd_usb_playback_ops = { 1586 .open = snd_usb_playback_open, 1587 .close = snd_usb_playback_close, 1588 .ioctl = snd_pcm_lib_ioctl, 1589 .hw_params = snd_usb_hw_params, 1590 .hw_free = snd_usb_hw_free, 1591 .prepare = snd_usb_pcm_prepare, 1592 .trigger = snd_usb_substream_playback_trigger, 1593 .pointer = snd_usb_pcm_pointer, 1594 .page = snd_pcm_lib_get_vmalloc_page, 1595 .mmap = snd_pcm_lib_mmap_vmalloc, 1596 }; 1597 1598 static struct snd_pcm_ops snd_usb_capture_ops = { 1599 .open = snd_usb_capture_open, 1600 .close = snd_usb_capture_close, 1601 .ioctl = snd_pcm_lib_ioctl, 1602 .hw_params = snd_usb_hw_params, 1603 .hw_free = snd_usb_hw_free, 1604 .prepare = snd_usb_pcm_prepare, 1605 .trigger = snd_usb_substream_capture_trigger, 1606 .pointer = snd_usb_pcm_pointer, 1607 .page = snd_pcm_lib_get_vmalloc_page, 1608 .mmap = snd_pcm_lib_mmap_vmalloc, 1609 }; 1610 1611 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream) 1612 { 1613 snd_pcm_set_ops(pcm, stream, 1614 stream == SNDRV_PCM_STREAM_PLAYBACK ? 1615 &snd_usb_playback_ops : &snd_usb_capture_ops); 1616 } 1617