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