1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 */ 4 5 #include <linux/init.h> 6 #include <linux/slab.h> 7 #include <linux/bitrev.h> 8 #include <linux/ratelimit.h> 9 #include <linux/usb.h> 10 #include <linux/usb/audio.h> 11 #include <linux/usb/audio-v2.h> 12 13 #include <sound/core.h> 14 #include <sound/pcm.h> 15 #include <sound/pcm_params.h> 16 17 #include "usbaudio.h" 18 #include "card.h" 19 #include "quirks.h" 20 #include "endpoint.h" 21 #include "helper.h" 22 #include "pcm.h" 23 #include "clock.h" 24 #include "power.h" 25 #include "media.h" 26 #include "implicit.h" 27 28 #define SUBSTREAM_FLAG_DATA_EP_STARTED 0 29 #define SUBSTREAM_FLAG_SYNC_EP_STARTED 1 30 31 /* return the estimated delay based on USB frame counters */ 32 static snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs, 33 struct snd_pcm_runtime *runtime) 34 { 35 unsigned int current_frame_number; 36 unsigned int frame_diff; 37 int est_delay; 38 int queued; 39 40 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) { 41 queued = bytes_to_frames(runtime, subs->inflight_bytes); 42 if (!queued) 43 return 0; 44 } else if (!subs->running) { 45 return 0; 46 } 47 48 current_frame_number = usb_get_current_frame_number(subs->dev); 49 /* 50 * HCD implementations use different widths, use lower 8 bits. 51 * The delay will be managed up to 256ms, which is more than 52 * enough 53 */ 54 frame_diff = (current_frame_number - subs->last_frame_number) & 0xff; 55 56 /* Approximation based on number of samples per USB frame (ms), 57 some truncation for 44.1 but the estimate is good enough */ 58 est_delay = frame_diff * runtime->rate / 1000; 59 60 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) { 61 est_delay = queued - est_delay; 62 if (est_delay < 0) 63 est_delay = 0; 64 } 65 66 return est_delay; 67 } 68 69 /* 70 * return the current pcm pointer. just based on the hwptr_done value. 71 */ 72 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream) 73 { 74 struct snd_pcm_runtime *runtime = substream->runtime; 75 struct snd_usb_substream *subs = runtime->private_data; 76 unsigned int hwptr_done; 77 78 if (atomic_read(&subs->stream->chip->shutdown)) 79 return SNDRV_PCM_POS_XRUN; 80 spin_lock(&subs->lock); 81 hwptr_done = subs->hwptr_done; 82 runtime->delay = snd_usb_pcm_delay(subs, runtime); 83 spin_unlock(&subs->lock); 84 return bytes_to_frames(runtime, hwptr_done); 85 } 86 87 /* 88 * find a matching audio format 89 */ 90 static const struct audioformat * 91 find_format(struct list_head *fmt_list_head, snd_pcm_format_t format, 92 unsigned int rate, unsigned int channels, bool strict_match, 93 struct snd_usb_substream *subs) 94 { 95 const struct audioformat *fp; 96 const struct audioformat *found = NULL; 97 int cur_attr = 0, attr; 98 99 list_for_each_entry(fp, fmt_list_head, list) { 100 if (strict_match) { 101 if (!(fp->formats & pcm_format_to_bits(format))) 102 continue; 103 if (fp->channels != channels) 104 continue; 105 } 106 if (rate < fp->rate_min || rate > fp->rate_max) 107 continue; 108 if (!(fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) { 109 unsigned int i; 110 for (i = 0; i < fp->nr_rates; i++) 111 if (fp->rate_table[i] == rate) 112 break; 113 if (i >= fp->nr_rates) 114 continue; 115 } 116 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE; 117 if (!found) { 118 found = fp; 119 cur_attr = attr; 120 continue; 121 } 122 /* avoid async out and adaptive in if the other method 123 * supports the same format. 124 * this is a workaround for the case like 125 * M-audio audiophile USB. 126 */ 127 if (subs && attr != cur_attr) { 128 if ((attr == USB_ENDPOINT_SYNC_ASYNC && 129 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) || 130 (attr == USB_ENDPOINT_SYNC_ADAPTIVE && 131 subs->direction == SNDRV_PCM_STREAM_CAPTURE)) 132 continue; 133 if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC && 134 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) || 135 (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE && 136 subs->direction == SNDRV_PCM_STREAM_CAPTURE)) { 137 found = fp; 138 cur_attr = attr; 139 continue; 140 } 141 } 142 /* find the format with the largest max. packet size */ 143 if (fp->maxpacksize > found->maxpacksize) { 144 found = fp; 145 cur_attr = attr; 146 } 147 } 148 return found; 149 } 150 151 static const struct audioformat * 152 find_substream_format(struct snd_usb_substream *subs, 153 const struct snd_pcm_hw_params *params) 154 { 155 return find_format(&subs->fmt_list, params_format(params), 156 params_rate(params), params_channels(params), 157 true, subs); 158 } 159 160 static int init_pitch_v1(struct snd_usb_audio *chip, int ep) 161 { 162 struct usb_device *dev = chip->dev; 163 unsigned char data[1]; 164 int err; 165 166 data[0] = 1; 167 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR, 168 USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT, 169 UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep, 170 data, sizeof(data)); 171 return err; 172 } 173 174 static int init_pitch_v2(struct snd_usb_audio *chip, int ep) 175 { 176 struct usb_device *dev = chip->dev; 177 unsigned char data[1]; 178 int err; 179 180 data[0] = 1; 181 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR, 182 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT, 183 UAC2_EP_CS_PITCH << 8, 0, 184 data, sizeof(data)); 185 return err; 186 } 187 188 /* 189 * initialize the pitch control and sample rate 190 */ 191 int snd_usb_init_pitch(struct snd_usb_audio *chip, 192 const struct audioformat *fmt) 193 { 194 int err; 195 196 /* if endpoint doesn't have pitch control, bail out */ 197 if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL)) 198 return 0; 199 200 usb_audio_dbg(chip, "enable PITCH for EP 0x%x\n", fmt->endpoint); 201 202 switch (fmt->protocol) { 203 case UAC_VERSION_1: 204 err = init_pitch_v1(chip, fmt->endpoint); 205 break; 206 case UAC_VERSION_2: 207 err = init_pitch_v2(chip, fmt->endpoint); 208 break; 209 default: 210 return 0; 211 } 212 213 if (err < 0) { 214 usb_audio_err(chip, "failed to enable PITCH for EP 0x%x\n", 215 fmt->endpoint); 216 return err; 217 } 218 219 return 0; 220 } 221 222 static bool stop_endpoints(struct snd_usb_substream *subs, bool keep_pending) 223 { 224 bool stopped = 0; 225 226 if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) { 227 snd_usb_endpoint_stop(subs->sync_endpoint, keep_pending); 228 stopped = true; 229 } 230 if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) { 231 snd_usb_endpoint_stop(subs->data_endpoint, keep_pending); 232 stopped = true; 233 } 234 return stopped; 235 } 236 237 static int start_endpoints(struct snd_usb_substream *subs) 238 { 239 int err; 240 241 if (!subs->data_endpoint) 242 return -EINVAL; 243 244 if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) { 245 err = snd_usb_endpoint_start(subs->data_endpoint); 246 if (err < 0) { 247 clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags); 248 goto error; 249 } 250 } 251 252 if (subs->sync_endpoint && 253 !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) { 254 err = snd_usb_endpoint_start(subs->sync_endpoint); 255 if (err < 0) { 256 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags); 257 goto error; 258 } 259 } 260 261 return 0; 262 263 error: 264 stop_endpoints(subs, false); 265 return err; 266 } 267 268 static void sync_pending_stops(struct snd_usb_substream *subs) 269 { 270 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint); 271 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint); 272 } 273 274 /* PCM sync_stop callback */ 275 static int snd_usb_pcm_sync_stop(struct snd_pcm_substream *substream) 276 { 277 struct snd_usb_substream *subs = substream->runtime->private_data; 278 279 sync_pending_stops(subs); 280 return 0; 281 } 282 283 /* Set up sync endpoint */ 284 int snd_usb_audioformat_set_sync_ep(struct snd_usb_audio *chip, 285 struct audioformat *fmt) 286 { 287 struct usb_device *dev = chip->dev; 288 struct usb_host_interface *alts; 289 struct usb_interface_descriptor *altsd; 290 unsigned int ep, attr, sync_attr; 291 bool is_playback; 292 int err; 293 294 if (fmt->sync_ep) 295 return 0; /* already set up */ 296 297 alts = snd_usb_get_host_interface(chip, fmt->iface, fmt->altsetting); 298 if (!alts) 299 return 0; 300 altsd = get_iface_desc(alts); 301 302 err = snd_usb_parse_implicit_fb_quirk(chip, fmt, alts); 303 if (err > 0) 304 return 0; /* matched */ 305 306 /* 307 * Generic sync EP handling 308 */ 309 310 if (fmt->ep_idx > 0 || altsd->bNumEndpoints < 2) 311 return 0; 312 313 is_playback = !(get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN); 314 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE; 315 if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC || 316 attr == USB_ENDPOINT_SYNC_ADAPTIVE)) || 317 (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE)) 318 return 0; 319 320 sync_attr = get_endpoint(alts, 1)->bmAttributes; 321 322 /* 323 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see 324 * if we don't find a sync endpoint, as on M-Audio Transit. In case of 325 * error fall back to SYNC mode and don't create sync endpoint 326 */ 327 328 /* check sync-pipe endpoint */ 329 /* ... and check descriptor size before accessing bSynchAddress 330 because there is a version of the SB Audigy 2 NX firmware lacking 331 the audio fields in the endpoint descriptors */ 332 if ((sync_attr & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC || 333 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE && 334 get_endpoint(alts, 1)->bSynchAddress != 0)) { 335 dev_err(&dev->dev, 336 "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n", 337 fmt->iface, fmt->altsetting, 338 get_endpoint(alts, 1)->bmAttributes, 339 get_endpoint(alts, 1)->bLength, 340 get_endpoint(alts, 1)->bSynchAddress); 341 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE) 342 return 0; 343 return -EINVAL; 344 } 345 ep = get_endpoint(alts, 1)->bEndpointAddress; 346 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE && 347 get_endpoint(alts, 0)->bSynchAddress != 0 && 348 ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) || 349 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) { 350 dev_err(&dev->dev, 351 "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n", 352 fmt->iface, fmt->altsetting, 353 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress); 354 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE) 355 return 0; 356 return -EINVAL; 357 } 358 359 fmt->sync_ep = ep; 360 fmt->sync_iface = altsd->bInterfaceNumber; 361 fmt->sync_altsetting = altsd->bAlternateSetting; 362 fmt->sync_ep_idx = 1; 363 if ((sync_attr & USB_ENDPOINT_USAGE_MASK) == USB_ENDPOINT_USAGE_IMPLICIT_FB) 364 fmt->implicit_fb = 1; 365 366 dev_dbg(&dev->dev, "%d:%d: found sync_ep=0x%x, iface=%d, alt=%d, implicit_fb=%d\n", 367 fmt->iface, fmt->altsetting, fmt->sync_ep, fmt->sync_iface, 368 fmt->sync_altsetting, fmt->implicit_fb); 369 370 return 0; 371 } 372 373 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state) 374 { 375 int ret; 376 377 if (!subs->str_pd) 378 return 0; 379 380 ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state); 381 if (ret < 0) { 382 dev_err(&subs->dev->dev, 383 "Cannot change Power Domain ID: %d to state: %d. Err: %d\n", 384 subs->str_pd->pd_id, state, ret); 385 return ret; 386 } 387 388 return 0; 389 } 390 391 int snd_usb_pcm_suspend(struct snd_usb_stream *as) 392 { 393 int ret; 394 395 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2); 396 if (ret < 0) 397 return ret; 398 399 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2); 400 if (ret < 0) 401 return ret; 402 403 return 0; 404 } 405 406 int snd_usb_pcm_resume(struct snd_usb_stream *as) 407 { 408 int ret; 409 410 ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1); 411 if (ret < 0) 412 return ret; 413 414 ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1); 415 if (ret < 0) 416 return ret; 417 418 return 0; 419 } 420 421 static void close_endpoints(struct snd_usb_audio *chip, 422 struct snd_usb_substream *subs) 423 { 424 if (subs->data_endpoint) { 425 snd_usb_endpoint_set_sync(chip, subs->data_endpoint, NULL); 426 snd_usb_endpoint_close(chip, subs->data_endpoint); 427 subs->data_endpoint = NULL; 428 } 429 430 if (subs->sync_endpoint) { 431 snd_usb_endpoint_close(chip, subs->sync_endpoint); 432 subs->sync_endpoint = NULL; 433 } 434 } 435 436 static int configure_endpoints(struct snd_usb_audio *chip, 437 struct snd_usb_substream *subs) 438 { 439 int err; 440 441 if (subs->data_endpoint->need_setup) { 442 /* stop any running stream beforehand */ 443 if (stop_endpoints(subs, false)) 444 sync_pending_stops(subs); 445 if (subs->sync_endpoint) { 446 err = snd_usb_endpoint_configure(chip, subs->sync_endpoint); 447 if (err < 0) 448 return err; 449 } 450 err = snd_usb_endpoint_configure(chip, subs->data_endpoint); 451 if (err < 0) 452 return err; 453 snd_usb_set_format_quirk(subs, subs->cur_audiofmt); 454 } else { 455 if (subs->sync_endpoint) { 456 err = snd_usb_endpoint_configure(chip, subs->sync_endpoint); 457 if (err < 0) 458 return err; 459 } 460 } 461 462 return 0; 463 } 464 465 /* 466 * hw_params callback 467 * 468 * allocate a buffer and set the given audio format. 469 * 470 * so far we use a physically linear buffer although packetize transfer 471 * doesn't need a continuous area. 472 * if sg buffer is supported on the later version of alsa, we'll follow 473 * that. 474 */ 475 static int snd_usb_hw_params(struct snd_pcm_substream *substream, 476 struct snd_pcm_hw_params *hw_params) 477 { 478 struct snd_usb_substream *subs = substream->runtime->private_data; 479 struct snd_usb_audio *chip = subs->stream->chip; 480 const struct audioformat *fmt; 481 const struct audioformat *sync_fmt; 482 int ret; 483 484 ret = snd_media_start_pipeline(subs); 485 if (ret) 486 return ret; 487 488 fmt = find_substream_format(subs, hw_params); 489 if (!fmt) { 490 usb_audio_dbg(chip, 491 "cannot find format: format=%s, rate=%d, channels=%d\n", 492 snd_pcm_format_name(params_format(hw_params)), 493 params_rate(hw_params), params_channels(hw_params)); 494 ret = -EINVAL; 495 goto stop_pipeline; 496 } 497 498 if (fmt->implicit_fb) { 499 sync_fmt = snd_usb_find_implicit_fb_sync_format(chip, fmt, 500 hw_params, 501 !substream->stream); 502 if (!sync_fmt) { 503 usb_audio_dbg(chip, 504 "cannot find sync format: ep=0x%x, iface=%d:%d, format=%s, rate=%d, channels=%d\n", 505 fmt->sync_ep, fmt->sync_iface, 506 fmt->sync_altsetting, 507 snd_pcm_format_name(params_format(hw_params)), 508 params_rate(hw_params), params_channels(hw_params)); 509 ret = -EINVAL; 510 goto stop_pipeline; 511 } 512 } else { 513 sync_fmt = fmt; 514 } 515 516 ret = snd_usb_lock_shutdown(chip); 517 if (ret < 0) 518 goto stop_pipeline; 519 520 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0); 521 if (ret < 0) 522 goto unlock; 523 524 if (subs->data_endpoint) { 525 if (snd_usb_endpoint_compatible(chip, subs->data_endpoint, 526 fmt, hw_params)) 527 goto unlock; 528 close_endpoints(chip, subs); 529 } 530 531 subs->data_endpoint = snd_usb_endpoint_open(chip, fmt, hw_params, false); 532 if (!subs->data_endpoint) { 533 ret = -EINVAL; 534 goto unlock; 535 } 536 537 if (fmt->sync_ep) { 538 subs->sync_endpoint = snd_usb_endpoint_open(chip, sync_fmt, 539 hw_params, 540 fmt == sync_fmt); 541 if (!subs->sync_endpoint) { 542 ret = -EINVAL; 543 goto unlock; 544 } 545 546 snd_usb_endpoint_set_sync(chip, subs->data_endpoint, 547 subs->sync_endpoint); 548 } 549 550 mutex_lock(&chip->mutex); 551 subs->cur_audiofmt = fmt; 552 mutex_unlock(&chip->mutex); 553 554 ret = configure_endpoints(chip, subs); 555 556 unlock: 557 if (ret < 0) 558 close_endpoints(chip, subs); 559 560 snd_usb_unlock_shutdown(chip); 561 stop_pipeline: 562 if (ret < 0) 563 snd_media_stop_pipeline(subs); 564 565 return ret; 566 } 567 568 /* 569 * hw_free callback 570 * 571 * reset the audio format and release the buffer 572 */ 573 static int snd_usb_hw_free(struct snd_pcm_substream *substream) 574 { 575 struct snd_usb_substream *subs = substream->runtime->private_data; 576 struct snd_usb_audio *chip = subs->stream->chip; 577 578 snd_media_stop_pipeline(subs); 579 mutex_lock(&chip->mutex); 580 subs->cur_audiofmt = NULL; 581 mutex_unlock(&chip->mutex); 582 if (!snd_usb_lock_shutdown(chip)) { 583 if (stop_endpoints(subs, false)) 584 sync_pending_stops(subs); 585 close_endpoints(chip, subs); 586 snd_usb_unlock_shutdown(chip); 587 } 588 589 return 0; 590 } 591 592 /* free-wheeling mode? (e.g. dmix) */ 593 static int in_free_wheeling_mode(struct snd_pcm_runtime *runtime) 594 { 595 return runtime->stop_threshold > runtime->buffer_size; 596 } 597 598 /* check whether early start is needed for playback stream */ 599 static int lowlatency_playback_available(struct snd_pcm_runtime *runtime, 600 struct snd_usb_substream *subs) 601 { 602 struct snd_usb_audio *chip = subs->stream->chip; 603 604 if (subs->direction == SNDRV_PCM_STREAM_CAPTURE) 605 return false; 606 /* disabled via module option? */ 607 if (!chip->lowlatency) 608 return false; 609 if (in_free_wheeling_mode(runtime)) 610 return false; 611 /* implicit feedback mode has own operation mode */ 612 if (snd_usb_endpoint_implicit_feedback_sink(subs->data_endpoint)) 613 return false; 614 return true; 615 } 616 617 /* 618 * prepare callback 619 * 620 * only a few subtle things... 621 */ 622 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream) 623 { 624 struct snd_pcm_runtime *runtime = substream->runtime; 625 struct snd_usb_substream *subs = runtime->private_data; 626 struct snd_usb_audio *chip = subs->stream->chip; 627 int ret; 628 629 ret = snd_usb_lock_shutdown(chip); 630 if (ret < 0) 631 return ret; 632 if (snd_BUG_ON(!subs->data_endpoint)) { 633 ret = -EIO; 634 goto unlock; 635 } 636 637 ret = configure_endpoints(chip, subs); 638 if (ret < 0) 639 goto unlock; 640 641 /* reset the pointer */ 642 subs->buffer_bytes = frames_to_bytes(runtime, runtime->buffer_size); 643 subs->inflight_bytes = 0; 644 subs->hwptr_done = 0; 645 subs->transfer_done = 0; 646 subs->last_frame_number = 0; 647 subs->period_elapsed_pending = 0; 648 runtime->delay = 0; 649 650 subs->lowlatency_playback = lowlatency_playback_available(runtime, subs); 651 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 652 !subs->lowlatency_playback) 653 ret = start_endpoints(subs); 654 655 unlock: 656 snd_usb_unlock_shutdown(chip); 657 return ret; 658 } 659 660 /* 661 * h/w constraints 662 */ 663 664 #ifdef HW_CONST_DEBUG 665 #define hwc_debug(fmt, args...) pr_debug(fmt, ##args) 666 #else 667 #define hwc_debug(fmt, args...) do { } while(0) 668 #endif 669 670 static const struct snd_pcm_hardware snd_usb_hardware = 671 { 672 .info = SNDRV_PCM_INFO_MMAP | 673 SNDRV_PCM_INFO_MMAP_VALID | 674 SNDRV_PCM_INFO_BATCH | 675 SNDRV_PCM_INFO_INTERLEAVED | 676 SNDRV_PCM_INFO_BLOCK_TRANSFER | 677 SNDRV_PCM_INFO_PAUSE, 678 .channels_min = 1, 679 .channels_max = 256, 680 .buffer_bytes_max = INT_MAX, /* limited by BUFFER_TIME later */ 681 .period_bytes_min = 64, 682 .period_bytes_max = INT_MAX, /* limited by PERIOD_TIME later */ 683 .periods_min = 2, 684 .periods_max = 1024, 685 }; 686 687 static int hw_check_valid_format(struct snd_usb_substream *subs, 688 struct snd_pcm_hw_params *params, 689 const struct audioformat *fp) 690 { 691 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 692 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 693 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 694 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME); 695 struct snd_mask check_fmts; 696 unsigned int ptime; 697 698 /* check the format */ 699 snd_mask_none(&check_fmts); 700 check_fmts.bits[0] = (u32)fp->formats; 701 check_fmts.bits[1] = (u32)(fp->formats >> 32); 702 snd_mask_intersect(&check_fmts, fmts); 703 if (snd_mask_empty(&check_fmts)) { 704 hwc_debug(" > check: no supported format 0x%llx\n", fp->formats); 705 return 0; 706 } 707 /* check the channels */ 708 if (fp->channels < ct->min || fp->channels > ct->max) { 709 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max); 710 return 0; 711 } 712 /* check the rate is within the range */ 713 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) { 714 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max); 715 return 0; 716 } 717 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) { 718 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min); 719 return 0; 720 } 721 /* check whether the period time is >= the data packet interval */ 722 if (subs->speed != USB_SPEED_FULL) { 723 ptime = 125 * (1 << fp->datainterval); 724 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) { 725 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max); 726 return 0; 727 } 728 } 729 return 1; 730 } 731 732 static int apply_hw_params_minmax(struct snd_interval *it, unsigned int rmin, 733 unsigned int rmax) 734 { 735 int changed; 736 737 if (rmin > rmax) { 738 hwc_debug(" --> get empty\n"); 739 it->empty = 1; 740 return -EINVAL; 741 } 742 743 changed = 0; 744 if (it->min < rmin) { 745 it->min = rmin; 746 it->openmin = 0; 747 changed = 1; 748 } 749 if (it->max > rmax) { 750 it->max = rmax; 751 it->openmax = 0; 752 changed = 1; 753 } 754 if (snd_interval_checkempty(it)) { 755 it->empty = 1; 756 return -EINVAL; 757 } 758 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed); 759 return changed; 760 } 761 762 static int hw_rule_rate(struct snd_pcm_hw_params *params, 763 struct snd_pcm_hw_rule *rule) 764 { 765 struct snd_usb_substream *subs = rule->private; 766 struct snd_usb_audio *chip = subs->stream->chip; 767 const struct audioformat *fp; 768 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 769 unsigned int rmin, rmax, r; 770 int i; 771 772 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max); 773 rmin = UINT_MAX; 774 rmax = 0; 775 list_for_each_entry(fp, &subs->fmt_list, list) { 776 if (!hw_check_valid_format(subs, params, fp)) 777 continue; 778 r = snd_usb_endpoint_get_clock_rate(chip, fp->clock); 779 if (r > 0) { 780 if (!snd_interval_test(it, r)) 781 continue; 782 rmin = min(rmin, r); 783 rmax = max(rmax, r); 784 continue; 785 } 786 if (fp->rate_table && fp->nr_rates) { 787 for (i = 0; i < fp->nr_rates; i++) { 788 r = fp->rate_table[i]; 789 if (!snd_interval_test(it, r)) 790 continue; 791 rmin = min(rmin, r); 792 rmax = max(rmax, r); 793 } 794 } else { 795 rmin = min(rmin, fp->rate_min); 796 rmax = max(rmax, fp->rate_max); 797 } 798 } 799 800 return apply_hw_params_minmax(it, rmin, rmax); 801 } 802 803 804 static int hw_rule_channels(struct snd_pcm_hw_params *params, 805 struct snd_pcm_hw_rule *rule) 806 { 807 struct snd_usb_substream *subs = rule->private; 808 const struct audioformat *fp; 809 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 810 unsigned int rmin, rmax; 811 812 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max); 813 rmin = UINT_MAX; 814 rmax = 0; 815 list_for_each_entry(fp, &subs->fmt_list, list) { 816 if (!hw_check_valid_format(subs, params, fp)) 817 continue; 818 rmin = min(rmin, fp->channels); 819 rmax = max(rmax, fp->channels); 820 } 821 822 return apply_hw_params_minmax(it, rmin, rmax); 823 } 824 825 static int apply_hw_params_format_bits(struct snd_mask *fmt, u64 fbits) 826 { 827 u32 oldbits[2]; 828 int changed; 829 830 oldbits[0] = fmt->bits[0]; 831 oldbits[1] = fmt->bits[1]; 832 fmt->bits[0] &= (u32)fbits; 833 fmt->bits[1] &= (u32)(fbits >> 32); 834 if (!fmt->bits[0] && !fmt->bits[1]) { 835 hwc_debug(" --> get empty\n"); 836 return -EINVAL; 837 } 838 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]); 839 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed); 840 return changed; 841 } 842 843 static int hw_rule_format(struct snd_pcm_hw_params *params, 844 struct snd_pcm_hw_rule *rule) 845 { 846 struct snd_usb_substream *subs = rule->private; 847 const struct audioformat *fp; 848 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 849 u64 fbits; 850 851 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]); 852 fbits = 0; 853 list_for_each_entry(fp, &subs->fmt_list, list) { 854 if (!hw_check_valid_format(subs, params, fp)) 855 continue; 856 fbits |= fp->formats; 857 } 858 return apply_hw_params_format_bits(fmt, fbits); 859 } 860 861 static int hw_rule_period_time(struct snd_pcm_hw_params *params, 862 struct snd_pcm_hw_rule *rule) 863 { 864 struct snd_usb_substream *subs = rule->private; 865 const struct audioformat *fp; 866 struct snd_interval *it; 867 unsigned char min_datainterval; 868 unsigned int pmin; 869 870 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME); 871 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max); 872 min_datainterval = 0xff; 873 list_for_each_entry(fp, &subs->fmt_list, list) { 874 if (!hw_check_valid_format(subs, params, fp)) 875 continue; 876 min_datainterval = min(min_datainterval, fp->datainterval); 877 } 878 if (min_datainterval == 0xff) { 879 hwc_debug(" --> get empty\n"); 880 it->empty = 1; 881 return -EINVAL; 882 } 883 pmin = 125 * (1 << min_datainterval); 884 885 return apply_hw_params_minmax(it, pmin, UINT_MAX); 886 } 887 888 /* get the EP or the sync EP for implicit fb when it's already set up */ 889 static const struct snd_usb_endpoint * 890 get_sync_ep_from_substream(struct snd_usb_substream *subs) 891 { 892 struct snd_usb_audio *chip = subs->stream->chip; 893 const struct audioformat *fp; 894 const struct snd_usb_endpoint *ep; 895 896 list_for_each_entry(fp, &subs->fmt_list, list) { 897 ep = snd_usb_get_endpoint(chip, fp->endpoint); 898 if (ep && ep->cur_audiofmt) { 899 /* if EP is already opened solely for this substream, 900 * we still allow us to change the parameter; otherwise 901 * this substream has to follow the existing parameter 902 */ 903 if (ep->cur_audiofmt != subs->cur_audiofmt || ep->opened > 1) 904 return ep; 905 } 906 if (!fp->implicit_fb) 907 continue; 908 /* for the implicit fb, check the sync ep as well */ 909 ep = snd_usb_get_endpoint(chip, fp->sync_ep); 910 if (ep && ep->cur_audiofmt) 911 return ep; 912 } 913 return NULL; 914 } 915 916 /* additional hw constraints for implicit feedback mode */ 917 static int hw_rule_format_implicit_fb(struct snd_pcm_hw_params *params, 918 struct snd_pcm_hw_rule *rule) 919 { 920 struct snd_usb_substream *subs = rule->private; 921 const struct snd_usb_endpoint *ep; 922 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 923 924 ep = get_sync_ep_from_substream(subs); 925 if (!ep) 926 return 0; 927 928 hwc_debug("applying %s\n", __func__); 929 return apply_hw_params_format_bits(fmt, pcm_format_to_bits(ep->cur_format)); 930 } 931 932 static int hw_rule_rate_implicit_fb(struct snd_pcm_hw_params *params, 933 struct snd_pcm_hw_rule *rule) 934 { 935 struct snd_usb_substream *subs = rule->private; 936 const struct snd_usb_endpoint *ep; 937 struct snd_interval *it; 938 939 ep = get_sync_ep_from_substream(subs); 940 if (!ep) 941 return 0; 942 943 hwc_debug("applying %s\n", __func__); 944 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 945 return apply_hw_params_minmax(it, ep->cur_rate, ep->cur_rate); 946 } 947 948 static int hw_rule_period_size_implicit_fb(struct snd_pcm_hw_params *params, 949 struct snd_pcm_hw_rule *rule) 950 { 951 struct snd_usb_substream *subs = rule->private; 952 const struct snd_usb_endpoint *ep; 953 struct snd_interval *it; 954 955 ep = get_sync_ep_from_substream(subs); 956 if (!ep) 957 return 0; 958 959 hwc_debug("applying %s\n", __func__); 960 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 961 return apply_hw_params_minmax(it, ep->cur_period_frames, 962 ep->cur_period_frames); 963 } 964 965 static int hw_rule_periods_implicit_fb(struct snd_pcm_hw_params *params, 966 struct snd_pcm_hw_rule *rule) 967 { 968 struct snd_usb_substream *subs = rule->private; 969 const struct snd_usb_endpoint *ep; 970 struct snd_interval *it; 971 972 ep = get_sync_ep_from_substream(subs); 973 if (!ep) 974 return 0; 975 976 hwc_debug("applying %s\n", __func__); 977 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIODS); 978 return apply_hw_params_minmax(it, ep->cur_buffer_periods, 979 ep->cur_buffer_periods); 980 } 981 982 /* 983 * set up the runtime hardware information. 984 */ 985 986 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs) 987 { 988 const struct audioformat *fp; 989 unsigned int pt, ptmin; 990 int param_period_time_if_needed = -1; 991 int err; 992 993 runtime->hw.formats = subs->formats; 994 995 runtime->hw.rate_min = 0x7fffffff; 996 runtime->hw.rate_max = 0; 997 runtime->hw.channels_min = 256; 998 runtime->hw.channels_max = 0; 999 runtime->hw.rates = 0; 1000 ptmin = UINT_MAX; 1001 /* check min/max rates and channels */ 1002 list_for_each_entry(fp, &subs->fmt_list, list) { 1003 runtime->hw.rates |= fp->rates; 1004 if (runtime->hw.rate_min > fp->rate_min) 1005 runtime->hw.rate_min = fp->rate_min; 1006 if (runtime->hw.rate_max < fp->rate_max) 1007 runtime->hw.rate_max = fp->rate_max; 1008 if (runtime->hw.channels_min > fp->channels) 1009 runtime->hw.channels_min = fp->channels; 1010 if (runtime->hw.channels_max < fp->channels) 1011 runtime->hw.channels_max = fp->channels; 1012 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) { 1013 /* FIXME: there might be more than one audio formats... */ 1014 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max = 1015 fp->frame_size; 1016 } 1017 pt = 125 * (1 << fp->datainterval); 1018 ptmin = min(ptmin, pt); 1019 } 1020 1021 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME; 1022 if (subs->speed == USB_SPEED_FULL) 1023 /* full speed devices have fixed data packet interval */ 1024 ptmin = 1000; 1025 if (ptmin == 1000) 1026 /* if period time doesn't go below 1 ms, no rules needed */ 1027 param_period_time_if_needed = -1; 1028 1029 err = snd_pcm_hw_constraint_minmax(runtime, 1030 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1031 ptmin, UINT_MAX); 1032 if (err < 0) 1033 return err; 1034 1035 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1036 hw_rule_rate, subs, 1037 SNDRV_PCM_HW_PARAM_RATE, 1038 SNDRV_PCM_HW_PARAM_FORMAT, 1039 SNDRV_PCM_HW_PARAM_CHANNELS, 1040 param_period_time_if_needed, 1041 -1); 1042 if (err < 0) 1043 return err; 1044 1045 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 1046 hw_rule_channels, subs, 1047 SNDRV_PCM_HW_PARAM_CHANNELS, 1048 SNDRV_PCM_HW_PARAM_FORMAT, 1049 SNDRV_PCM_HW_PARAM_RATE, 1050 param_period_time_if_needed, 1051 -1); 1052 if (err < 0) 1053 return err; 1054 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 1055 hw_rule_format, subs, 1056 SNDRV_PCM_HW_PARAM_FORMAT, 1057 SNDRV_PCM_HW_PARAM_RATE, 1058 SNDRV_PCM_HW_PARAM_CHANNELS, 1059 param_period_time_if_needed, 1060 -1); 1061 if (err < 0) 1062 return err; 1063 if (param_period_time_if_needed >= 0) { 1064 err = snd_pcm_hw_rule_add(runtime, 0, 1065 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1066 hw_rule_period_time, subs, 1067 SNDRV_PCM_HW_PARAM_FORMAT, 1068 SNDRV_PCM_HW_PARAM_CHANNELS, 1069 SNDRV_PCM_HW_PARAM_RATE, 1070 -1); 1071 if (err < 0) 1072 return err; 1073 } 1074 1075 /* set max period and buffer sizes for 1 and 2 seconds, respectively */ 1076 err = snd_pcm_hw_constraint_minmax(runtime, 1077 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1078 0, 1000000); 1079 if (err < 0) 1080 return err; 1081 err = snd_pcm_hw_constraint_minmax(runtime, 1082 SNDRV_PCM_HW_PARAM_BUFFER_TIME, 1083 0, 2000000); 1084 if (err < 0) 1085 return err; 1086 1087 /* additional hw constraints for implicit fb */ 1088 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 1089 hw_rule_format_implicit_fb, subs, 1090 SNDRV_PCM_HW_PARAM_FORMAT, -1); 1091 if (err < 0) 1092 return err; 1093 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1094 hw_rule_rate_implicit_fb, subs, 1095 SNDRV_PCM_HW_PARAM_RATE, -1); 1096 if (err < 0) 1097 return err; 1098 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1099 hw_rule_period_size_implicit_fb, subs, 1100 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 1101 if (err < 0) 1102 return err; 1103 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 1104 hw_rule_periods_implicit_fb, subs, 1105 SNDRV_PCM_HW_PARAM_PERIODS, -1); 1106 if (err < 0) 1107 return err; 1108 1109 list_for_each_entry(fp, &subs->fmt_list, list) { 1110 if (fp->implicit_fb) { 1111 runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX; 1112 break; 1113 } 1114 } 1115 1116 return 0; 1117 } 1118 1119 static int snd_usb_pcm_open(struct snd_pcm_substream *substream) 1120 { 1121 int direction = substream->stream; 1122 struct snd_usb_stream *as = snd_pcm_substream_chip(substream); 1123 struct snd_pcm_runtime *runtime = substream->runtime; 1124 struct snd_usb_substream *subs = &as->substream[direction]; 1125 int ret; 1126 1127 runtime->hw = snd_usb_hardware; 1128 /* need an explicit sync to catch applptr update in low-latency mode */ 1129 if (direction == SNDRV_PCM_STREAM_PLAYBACK && 1130 as->chip->lowlatency) 1131 runtime->hw.info |= SNDRV_PCM_INFO_SYNC_APPLPTR; 1132 runtime->private_data = subs; 1133 subs->pcm_substream = substream; 1134 /* runtime PM is also done there */ 1135 1136 /* initialize DSD/DOP context */ 1137 subs->dsd_dop.byte_idx = 0; 1138 subs->dsd_dop.channel = 0; 1139 subs->dsd_dop.marker = 1; 1140 1141 ret = setup_hw_info(runtime, subs); 1142 if (ret < 0) 1143 return ret; 1144 ret = snd_usb_autoresume(subs->stream->chip); 1145 if (ret < 0) 1146 return ret; 1147 ret = snd_media_stream_init(subs, as->pcm, direction); 1148 if (ret < 0) 1149 snd_usb_autosuspend(subs->stream->chip); 1150 return ret; 1151 } 1152 1153 static int snd_usb_pcm_close(struct snd_pcm_substream *substream) 1154 { 1155 int direction = substream->stream; 1156 struct snd_usb_stream *as = snd_pcm_substream_chip(substream); 1157 struct snd_usb_substream *subs = &as->substream[direction]; 1158 int ret; 1159 1160 snd_media_stop_pipeline(subs); 1161 1162 if (!snd_usb_lock_shutdown(subs->stream->chip)) { 1163 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1); 1164 snd_usb_unlock_shutdown(subs->stream->chip); 1165 if (ret < 0) 1166 return ret; 1167 } 1168 1169 subs->pcm_substream = NULL; 1170 snd_usb_autosuspend(subs->stream->chip); 1171 1172 return 0; 1173 } 1174 1175 /* Since a URB can handle only a single linear buffer, we must use double 1176 * buffering when the data to be transferred overflows the buffer boundary. 1177 * To avoid inconsistencies when updating hwptr_done, we use double buffering 1178 * for all URBs. 1179 */ 1180 static void retire_capture_urb(struct snd_usb_substream *subs, 1181 struct urb *urb) 1182 { 1183 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1184 unsigned int stride, frames, bytes, oldptr; 1185 int i, period_elapsed = 0; 1186 unsigned long flags; 1187 unsigned char *cp; 1188 int current_frame_number; 1189 1190 /* read frame number here, update pointer in critical section */ 1191 current_frame_number = usb_get_current_frame_number(subs->dev); 1192 1193 stride = runtime->frame_bits >> 3; 1194 1195 for (i = 0; i < urb->number_of_packets; i++) { 1196 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj; 1197 if (urb->iso_frame_desc[i].status && printk_ratelimit()) { 1198 dev_dbg(&subs->dev->dev, "frame %d active: %d\n", 1199 i, urb->iso_frame_desc[i].status); 1200 // continue; 1201 } 1202 bytes = urb->iso_frame_desc[i].actual_length; 1203 if (subs->stream_offset_adj > 0) { 1204 unsigned int adj = min(subs->stream_offset_adj, bytes); 1205 cp += adj; 1206 bytes -= adj; 1207 subs->stream_offset_adj -= adj; 1208 } 1209 frames = bytes / stride; 1210 if (!subs->txfr_quirk) 1211 bytes = frames * stride; 1212 if (bytes % (runtime->sample_bits >> 3) != 0) { 1213 int oldbytes = bytes; 1214 bytes = frames * stride; 1215 dev_warn_ratelimited(&subs->dev->dev, 1216 "Corrected urb data len. %d->%d\n", 1217 oldbytes, bytes); 1218 } 1219 /* update the current pointer */ 1220 spin_lock_irqsave(&subs->lock, flags); 1221 oldptr = subs->hwptr_done; 1222 subs->hwptr_done += bytes; 1223 if (subs->hwptr_done >= subs->buffer_bytes) 1224 subs->hwptr_done -= subs->buffer_bytes; 1225 frames = (bytes + (oldptr % stride)) / stride; 1226 subs->transfer_done += frames; 1227 if (subs->transfer_done >= runtime->period_size) { 1228 subs->transfer_done -= runtime->period_size; 1229 period_elapsed = 1; 1230 } 1231 1232 /* realign last_frame_number */ 1233 subs->last_frame_number = current_frame_number; 1234 1235 spin_unlock_irqrestore(&subs->lock, flags); 1236 /* copy a data chunk */ 1237 if (oldptr + bytes > subs->buffer_bytes) { 1238 unsigned int bytes1 = subs->buffer_bytes - oldptr; 1239 1240 memcpy(runtime->dma_area + oldptr, cp, bytes1); 1241 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1); 1242 } else { 1243 memcpy(runtime->dma_area + oldptr, cp, bytes); 1244 } 1245 } 1246 1247 if (period_elapsed) 1248 snd_pcm_period_elapsed(subs->pcm_substream); 1249 } 1250 1251 static void urb_ctx_queue_advance(struct snd_usb_substream *subs, 1252 struct urb *urb, unsigned int bytes) 1253 { 1254 struct snd_urb_ctx *ctx = urb->context; 1255 1256 ctx->queued += bytes; 1257 subs->inflight_bytes += bytes; 1258 subs->hwptr_done += bytes; 1259 if (subs->hwptr_done >= subs->buffer_bytes) 1260 subs->hwptr_done -= subs->buffer_bytes; 1261 } 1262 1263 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs, 1264 struct urb *urb, unsigned int bytes) 1265 { 1266 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1267 unsigned int dst_idx = 0; 1268 unsigned int src_idx = subs->hwptr_done; 1269 unsigned int wrap = subs->buffer_bytes; 1270 u8 *dst = urb->transfer_buffer; 1271 u8 *src = runtime->dma_area; 1272 static const u8 marker[] = { 0x05, 0xfa }; 1273 unsigned int queued = 0; 1274 1275 /* 1276 * The DSP DOP format defines a way to transport DSD samples over 1277 * normal PCM data endpoints. It requires stuffing of marker bytes 1278 * (0x05 and 0xfa, alternating per sample frame), and then expects 1279 * 2 additional bytes of actual payload. The whole frame is stored 1280 * LSB. 1281 * 1282 * Hence, for a stereo transport, the buffer layout looks like this, 1283 * where L refers to left channel samples and R to right. 1284 * 1285 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa 1286 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa 1287 * ..... 1288 * 1289 */ 1290 1291 while (bytes--) { 1292 if (++subs->dsd_dop.byte_idx == 3) { 1293 /* frame boundary? */ 1294 dst[dst_idx++] = marker[subs->dsd_dop.marker]; 1295 src_idx += 2; 1296 subs->dsd_dop.byte_idx = 0; 1297 1298 if (++subs->dsd_dop.channel % runtime->channels == 0) { 1299 /* alternate the marker */ 1300 subs->dsd_dop.marker++; 1301 subs->dsd_dop.marker %= ARRAY_SIZE(marker); 1302 subs->dsd_dop.channel = 0; 1303 } 1304 } else { 1305 /* stuff the DSD payload */ 1306 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap; 1307 1308 if (subs->cur_audiofmt->dsd_bitrev) 1309 dst[dst_idx++] = bitrev8(src[idx]); 1310 else 1311 dst[dst_idx++] = src[idx]; 1312 queued++; 1313 } 1314 } 1315 1316 urb_ctx_queue_advance(subs, urb, queued); 1317 } 1318 1319 /* copy bit-reversed bytes onto transfer buffer */ 1320 static void fill_playback_urb_dsd_bitrev(struct snd_usb_substream *subs, 1321 struct urb *urb, unsigned int bytes) 1322 { 1323 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1324 const u8 *src = runtime->dma_area; 1325 u8 *buf = urb->transfer_buffer; 1326 int i, ofs = subs->hwptr_done; 1327 1328 for (i = 0; i < bytes; i++) { 1329 *buf++ = bitrev8(src[ofs]); 1330 if (++ofs >= subs->buffer_bytes) 1331 ofs = 0; 1332 } 1333 1334 urb_ctx_queue_advance(subs, urb, bytes); 1335 } 1336 1337 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb, 1338 int offset, int stride, unsigned int bytes) 1339 { 1340 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1341 1342 if (subs->hwptr_done + bytes > subs->buffer_bytes) { 1343 /* err, the transferred area goes over buffer boundary. */ 1344 unsigned int bytes1 = subs->buffer_bytes - subs->hwptr_done; 1345 1346 memcpy(urb->transfer_buffer + offset, 1347 runtime->dma_area + subs->hwptr_done, bytes1); 1348 memcpy(urb->transfer_buffer + offset + bytes1, 1349 runtime->dma_area, bytes - bytes1); 1350 } else { 1351 memcpy(urb->transfer_buffer + offset, 1352 runtime->dma_area + subs->hwptr_done, bytes); 1353 } 1354 1355 urb_ctx_queue_advance(subs, urb, bytes); 1356 } 1357 1358 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs, 1359 struct urb *urb, int stride, 1360 unsigned int bytes) 1361 { 1362 __le32 packet_length; 1363 int i; 1364 1365 /* Put __le32 length descriptor at start of each packet. */ 1366 for (i = 0; i < urb->number_of_packets; i++) { 1367 unsigned int length = urb->iso_frame_desc[i].length; 1368 unsigned int offset = urb->iso_frame_desc[i].offset; 1369 1370 packet_length = cpu_to_le32(length); 1371 offset += i * sizeof(packet_length); 1372 urb->iso_frame_desc[i].offset = offset; 1373 urb->iso_frame_desc[i].length += sizeof(packet_length); 1374 memcpy(urb->transfer_buffer + offset, 1375 &packet_length, sizeof(packet_length)); 1376 copy_to_urb(subs, urb, offset + sizeof(packet_length), 1377 stride, length); 1378 } 1379 /* Adjust transfer size accordingly. */ 1380 bytes += urb->number_of_packets * sizeof(packet_length); 1381 return bytes; 1382 } 1383 1384 static int prepare_playback_urb(struct snd_usb_substream *subs, 1385 struct urb *urb, 1386 bool in_stream_lock) 1387 { 1388 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1389 struct snd_usb_endpoint *ep = subs->data_endpoint; 1390 struct snd_urb_ctx *ctx = urb->context; 1391 unsigned int frames, bytes; 1392 int counts; 1393 unsigned int transfer_done, frame_limit, avail = 0; 1394 int i, stride, period_elapsed = 0; 1395 unsigned long flags; 1396 int err = 0; 1397 1398 stride = ep->stride; 1399 1400 frames = 0; 1401 ctx->queued = 0; 1402 urb->number_of_packets = 0; 1403 1404 spin_lock_irqsave(&subs->lock, flags); 1405 frame_limit = subs->frame_limit + ep->max_urb_frames; 1406 transfer_done = subs->transfer_done; 1407 1408 if (subs->lowlatency_playback && 1409 runtime->status->state != SNDRV_PCM_STATE_DRAINING) { 1410 unsigned int hwptr = subs->hwptr_done / stride; 1411 1412 /* calculate the byte offset-in-buffer of the appl_ptr */ 1413 avail = (runtime->control->appl_ptr - runtime->hw_ptr_base) 1414 % runtime->buffer_size; 1415 if (avail <= hwptr) 1416 avail += runtime->buffer_size; 1417 avail -= hwptr; 1418 } 1419 1420 for (i = 0; i < ctx->packets; i++) { 1421 counts = snd_usb_endpoint_next_packet_size(ep, ctx, i, avail); 1422 if (counts < 0) 1423 break; 1424 /* set up descriptor */ 1425 urb->iso_frame_desc[i].offset = frames * stride; 1426 urb->iso_frame_desc[i].length = counts * stride; 1427 frames += counts; 1428 avail -= counts; 1429 urb->number_of_packets++; 1430 transfer_done += counts; 1431 if (transfer_done >= runtime->period_size) { 1432 transfer_done -= runtime->period_size; 1433 frame_limit = 0; 1434 period_elapsed = 1; 1435 if (subs->fmt_type == UAC_FORMAT_TYPE_II) { 1436 if (transfer_done > 0) { 1437 /* FIXME: fill-max mode is not 1438 * supported yet */ 1439 frames -= transfer_done; 1440 counts -= transfer_done; 1441 urb->iso_frame_desc[i].length = 1442 counts * stride; 1443 transfer_done = 0; 1444 } 1445 i++; 1446 if (i < ctx->packets) { 1447 /* add a transfer delimiter */ 1448 urb->iso_frame_desc[i].offset = 1449 frames * stride; 1450 urb->iso_frame_desc[i].length = 0; 1451 urb->number_of_packets++; 1452 } 1453 break; 1454 } 1455 } 1456 /* finish at the period boundary or after enough frames */ 1457 if ((period_elapsed || transfer_done >= frame_limit) && 1458 !snd_usb_endpoint_implicit_feedback_sink(ep)) 1459 break; 1460 } 1461 1462 if (!frames) { 1463 err = -EAGAIN; 1464 goto unlock; 1465 } 1466 1467 bytes = frames * stride; 1468 subs->transfer_done = transfer_done; 1469 subs->frame_limit = frame_limit; 1470 if (unlikely(ep->cur_format == SNDRV_PCM_FORMAT_DSD_U16_LE && 1471 subs->cur_audiofmt->dsd_dop)) { 1472 fill_playback_urb_dsd_dop(subs, urb, bytes); 1473 } else if (unlikely(ep->cur_format == SNDRV_PCM_FORMAT_DSD_U8 && 1474 subs->cur_audiofmt->dsd_bitrev)) { 1475 fill_playback_urb_dsd_bitrev(subs, urb, bytes); 1476 } else { 1477 /* usual PCM */ 1478 if (!subs->tx_length_quirk) 1479 copy_to_urb(subs, urb, 0, stride, bytes); 1480 else 1481 bytes = copy_to_urb_quirk(subs, urb, stride, bytes); 1482 /* bytes is now amount of outgoing data */ 1483 } 1484 1485 subs->last_frame_number = usb_get_current_frame_number(subs->dev); 1486 1487 if (subs->trigger_tstamp_pending_update) { 1488 /* this is the first actual URB submitted, 1489 * update trigger timestamp to reflect actual start time 1490 */ 1491 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 1492 subs->trigger_tstamp_pending_update = false; 1493 } 1494 1495 if (period_elapsed && !subs->running && subs->lowlatency_playback) { 1496 subs->period_elapsed_pending = 1; 1497 period_elapsed = 0; 1498 } 1499 1500 unlock: 1501 spin_unlock_irqrestore(&subs->lock, flags); 1502 if (err < 0) 1503 return err; 1504 urb->transfer_buffer_length = bytes; 1505 if (period_elapsed) { 1506 if (in_stream_lock) 1507 snd_pcm_period_elapsed_under_stream_lock(subs->pcm_substream); 1508 else 1509 snd_pcm_period_elapsed(subs->pcm_substream); 1510 } 1511 return 0; 1512 } 1513 1514 /* 1515 * process after playback data complete 1516 * - decrease the delay count again 1517 */ 1518 static void retire_playback_urb(struct snd_usb_substream *subs, 1519 struct urb *urb) 1520 { 1521 unsigned long flags; 1522 struct snd_urb_ctx *ctx = urb->context; 1523 bool period_elapsed = false; 1524 1525 spin_lock_irqsave(&subs->lock, flags); 1526 if (ctx->queued) { 1527 if (subs->inflight_bytes >= ctx->queued) 1528 subs->inflight_bytes -= ctx->queued; 1529 else 1530 subs->inflight_bytes = 0; 1531 } 1532 1533 subs->last_frame_number = usb_get_current_frame_number(subs->dev); 1534 if (subs->running) { 1535 period_elapsed = subs->period_elapsed_pending; 1536 subs->period_elapsed_pending = 0; 1537 } 1538 spin_unlock_irqrestore(&subs->lock, flags); 1539 if (period_elapsed) 1540 snd_pcm_period_elapsed(subs->pcm_substream); 1541 } 1542 1543 /* PCM ack callback for the playback stream; 1544 * this plays a role only when the stream is running in low-latency mode. 1545 */ 1546 static int snd_usb_pcm_playback_ack(struct snd_pcm_substream *substream) 1547 { 1548 struct snd_usb_substream *subs = substream->runtime->private_data; 1549 struct snd_usb_endpoint *ep; 1550 1551 if (!subs->lowlatency_playback || !subs->running) 1552 return 0; 1553 ep = subs->data_endpoint; 1554 if (!ep) 1555 return 0; 1556 /* When no more in-flight URBs available, try to process the pending 1557 * outputs here 1558 */ 1559 if (!ep->active_mask) 1560 snd_usb_queue_pending_output_urbs(ep, true); 1561 return 0; 1562 } 1563 1564 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream, 1565 int cmd) 1566 { 1567 struct snd_usb_substream *subs = substream->runtime->private_data; 1568 int err; 1569 1570 switch (cmd) { 1571 case SNDRV_PCM_TRIGGER_START: 1572 subs->trigger_tstamp_pending_update = true; 1573 fallthrough; 1574 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 1575 snd_usb_endpoint_set_callback(subs->data_endpoint, 1576 prepare_playback_urb, 1577 retire_playback_urb, 1578 subs); 1579 if (subs->lowlatency_playback && 1580 cmd == SNDRV_PCM_TRIGGER_START) { 1581 if (in_free_wheeling_mode(substream->runtime)) 1582 subs->lowlatency_playback = false; 1583 err = start_endpoints(subs); 1584 if (err < 0) { 1585 snd_usb_endpoint_set_callback(subs->data_endpoint, 1586 NULL, NULL, NULL); 1587 return err; 1588 } 1589 } 1590 subs->running = 1; 1591 dev_dbg(&subs->dev->dev, "%d:%d Start Playback PCM\n", 1592 subs->cur_audiofmt->iface, 1593 subs->cur_audiofmt->altsetting); 1594 return 0; 1595 case SNDRV_PCM_TRIGGER_SUSPEND: 1596 case SNDRV_PCM_TRIGGER_STOP: 1597 stop_endpoints(subs, substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING); 1598 snd_usb_endpoint_set_callback(subs->data_endpoint, 1599 NULL, NULL, NULL); 1600 subs->running = 0; 1601 dev_dbg(&subs->dev->dev, "%d:%d Stop Playback PCM\n", 1602 subs->cur_audiofmt->iface, 1603 subs->cur_audiofmt->altsetting); 1604 return 0; 1605 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 1606 /* keep retire_data_urb for delay calculation */ 1607 snd_usb_endpoint_set_callback(subs->data_endpoint, 1608 NULL, 1609 retire_playback_urb, 1610 subs); 1611 subs->running = 0; 1612 dev_dbg(&subs->dev->dev, "%d:%d Pause Playback PCM\n", 1613 subs->cur_audiofmt->iface, 1614 subs->cur_audiofmt->altsetting); 1615 return 0; 1616 } 1617 1618 return -EINVAL; 1619 } 1620 1621 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream, 1622 int cmd) 1623 { 1624 int err; 1625 struct snd_usb_substream *subs = substream->runtime->private_data; 1626 1627 switch (cmd) { 1628 case SNDRV_PCM_TRIGGER_START: 1629 err = start_endpoints(subs); 1630 if (err < 0) 1631 return err; 1632 fallthrough; 1633 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 1634 snd_usb_endpoint_set_callback(subs->data_endpoint, 1635 NULL, retire_capture_urb, 1636 subs); 1637 subs->last_frame_number = usb_get_current_frame_number(subs->dev); 1638 subs->running = 1; 1639 dev_dbg(&subs->dev->dev, "%d:%d Start Capture PCM\n", 1640 subs->cur_audiofmt->iface, 1641 subs->cur_audiofmt->altsetting); 1642 return 0; 1643 case SNDRV_PCM_TRIGGER_SUSPEND: 1644 case SNDRV_PCM_TRIGGER_STOP: 1645 stop_endpoints(subs, false); 1646 fallthrough; 1647 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 1648 snd_usb_endpoint_set_callback(subs->data_endpoint, 1649 NULL, NULL, NULL); 1650 subs->running = 0; 1651 dev_dbg(&subs->dev->dev, "%d:%d Stop Capture PCM\n", 1652 subs->cur_audiofmt->iface, 1653 subs->cur_audiofmt->altsetting); 1654 return 0; 1655 } 1656 1657 return -EINVAL; 1658 } 1659 1660 static const struct snd_pcm_ops snd_usb_playback_ops = { 1661 .open = snd_usb_pcm_open, 1662 .close = snd_usb_pcm_close, 1663 .hw_params = snd_usb_hw_params, 1664 .hw_free = snd_usb_hw_free, 1665 .prepare = snd_usb_pcm_prepare, 1666 .trigger = snd_usb_substream_playback_trigger, 1667 .sync_stop = snd_usb_pcm_sync_stop, 1668 .pointer = snd_usb_pcm_pointer, 1669 .ack = snd_usb_pcm_playback_ack, 1670 }; 1671 1672 static const struct snd_pcm_ops snd_usb_capture_ops = { 1673 .open = snd_usb_pcm_open, 1674 .close = snd_usb_pcm_close, 1675 .hw_params = snd_usb_hw_params, 1676 .hw_free = snd_usb_hw_free, 1677 .prepare = snd_usb_pcm_prepare, 1678 .trigger = snd_usb_substream_capture_trigger, 1679 .sync_stop = snd_usb_pcm_sync_stop, 1680 .pointer = snd_usb_pcm_pointer, 1681 }; 1682 1683 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream) 1684 { 1685 const struct snd_pcm_ops *ops; 1686 1687 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ? 1688 &snd_usb_playback_ops : &snd_usb_capture_ops; 1689 snd_pcm_set_ops(pcm, stream, ops); 1690 } 1691 1692 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs) 1693 { 1694 struct snd_pcm *pcm = subs->stream->pcm; 1695 struct snd_pcm_substream *s = pcm->streams[subs->direction].substream; 1696 struct device *dev = subs->dev->bus->sysdev; 1697 1698 if (snd_usb_use_vmalloc) 1699 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_VMALLOC, 1700 NULL, 0, 0); 1701 else 1702 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_DEV_SG, 1703 dev, 64*1024, 512*1024); 1704 } 1705