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