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