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) 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); 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); 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); 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)) 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)) 576 sync_pending_stops(subs); 577 close_endpoints(chip, subs); 578 snd_usb_unlock_shutdown(chip); 579 } 580 581 return 0; 582 } 583 584 /* 585 * prepare callback 586 * 587 * only a few subtle things... 588 */ 589 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream) 590 { 591 struct snd_pcm_runtime *runtime = substream->runtime; 592 struct snd_usb_substream *subs = runtime->private_data; 593 struct snd_usb_audio *chip = subs->stream->chip; 594 int ret; 595 596 ret = snd_usb_lock_shutdown(chip); 597 if (ret < 0) 598 return ret; 599 if (snd_BUG_ON(!subs->data_endpoint)) { 600 ret = -EIO; 601 goto unlock; 602 } 603 604 ret = configure_endpoints(chip, subs); 605 if (ret < 0) 606 goto unlock; 607 608 /* reset the pointer */ 609 subs->buffer_bytes = frames_to_bytes(runtime, runtime->buffer_size); 610 subs->inflight_bytes = 0; 611 subs->hwptr_done = 0; 612 subs->transfer_done = 0; 613 subs->last_frame_number = 0; 614 subs->period_elapsed_pending = 0; 615 runtime->delay = 0; 616 617 /* check whether early start is needed for playback stream */ 618 subs->early_playback_start = 619 subs->direction == SNDRV_PCM_STREAM_PLAYBACK && 620 (!chip->lowlatency || 621 (subs->data_endpoint->nominal_queue_size >= subs->buffer_bytes)); 622 623 if (subs->early_playback_start) 624 ret = start_endpoints(subs); 625 626 unlock: 627 snd_usb_unlock_shutdown(chip); 628 return ret; 629 } 630 631 /* 632 * h/w constraints 633 */ 634 635 #ifdef HW_CONST_DEBUG 636 #define hwc_debug(fmt, args...) pr_debug(fmt, ##args) 637 #else 638 #define hwc_debug(fmt, args...) do { } while(0) 639 #endif 640 641 static const struct snd_pcm_hardware snd_usb_hardware = 642 { 643 .info = SNDRV_PCM_INFO_MMAP | 644 SNDRV_PCM_INFO_MMAP_VALID | 645 SNDRV_PCM_INFO_BATCH | 646 SNDRV_PCM_INFO_INTERLEAVED | 647 SNDRV_PCM_INFO_BLOCK_TRANSFER | 648 SNDRV_PCM_INFO_PAUSE, 649 .channels_min = 1, 650 .channels_max = 256, 651 .buffer_bytes_max = 1024 * 1024, 652 .period_bytes_min = 64, 653 .period_bytes_max = 512 * 1024, 654 .periods_min = 2, 655 .periods_max = 1024, 656 }; 657 658 static int hw_check_valid_format(struct snd_usb_substream *subs, 659 struct snd_pcm_hw_params *params, 660 const struct audioformat *fp) 661 { 662 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 663 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 664 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 665 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME); 666 struct snd_mask check_fmts; 667 unsigned int ptime; 668 669 /* check the format */ 670 snd_mask_none(&check_fmts); 671 check_fmts.bits[0] = (u32)fp->formats; 672 check_fmts.bits[1] = (u32)(fp->formats >> 32); 673 snd_mask_intersect(&check_fmts, fmts); 674 if (snd_mask_empty(&check_fmts)) { 675 hwc_debug(" > check: no supported format 0x%llx\n", fp->formats); 676 return 0; 677 } 678 /* check the channels */ 679 if (fp->channels < ct->min || fp->channels > ct->max) { 680 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max); 681 return 0; 682 } 683 /* check the rate is within the range */ 684 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) { 685 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max); 686 return 0; 687 } 688 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) { 689 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min); 690 return 0; 691 } 692 /* check whether the period time is >= the data packet interval */ 693 if (subs->speed != USB_SPEED_FULL) { 694 ptime = 125 * (1 << fp->datainterval); 695 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) { 696 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max); 697 return 0; 698 } 699 } 700 return 1; 701 } 702 703 static int apply_hw_params_minmax(struct snd_interval *it, unsigned int rmin, 704 unsigned int rmax) 705 { 706 int changed; 707 708 if (rmin > rmax) { 709 hwc_debug(" --> get empty\n"); 710 it->empty = 1; 711 return -EINVAL; 712 } 713 714 changed = 0; 715 if (it->min < rmin) { 716 it->min = rmin; 717 it->openmin = 0; 718 changed = 1; 719 } 720 if (it->max > rmax) { 721 it->max = rmax; 722 it->openmax = 0; 723 changed = 1; 724 } 725 if (snd_interval_checkempty(it)) { 726 it->empty = 1; 727 return -EINVAL; 728 } 729 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed); 730 return changed; 731 } 732 733 static int hw_rule_rate(struct snd_pcm_hw_params *params, 734 struct snd_pcm_hw_rule *rule) 735 { 736 struct snd_usb_substream *subs = rule->private; 737 const struct audioformat *fp; 738 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 739 unsigned int rmin, rmax, r; 740 int i; 741 742 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max); 743 rmin = UINT_MAX; 744 rmax = 0; 745 list_for_each_entry(fp, &subs->fmt_list, list) { 746 if (!hw_check_valid_format(subs, params, fp)) 747 continue; 748 if (fp->rate_table && fp->nr_rates) { 749 for (i = 0; i < fp->nr_rates; i++) { 750 r = fp->rate_table[i]; 751 if (!snd_interval_test(it, r)) 752 continue; 753 rmin = min(rmin, r); 754 rmax = max(rmax, r); 755 } 756 } else { 757 rmin = min(rmin, fp->rate_min); 758 rmax = max(rmax, fp->rate_max); 759 } 760 } 761 762 return apply_hw_params_minmax(it, rmin, rmax); 763 } 764 765 766 static int hw_rule_channels(struct snd_pcm_hw_params *params, 767 struct snd_pcm_hw_rule *rule) 768 { 769 struct snd_usb_substream *subs = rule->private; 770 const struct audioformat *fp; 771 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 772 unsigned int rmin, rmax; 773 774 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max); 775 rmin = UINT_MAX; 776 rmax = 0; 777 list_for_each_entry(fp, &subs->fmt_list, list) { 778 if (!hw_check_valid_format(subs, params, fp)) 779 continue; 780 rmin = min(rmin, fp->channels); 781 rmax = max(rmax, fp->channels); 782 } 783 784 return apply_hw_params_minmax(it, rmin, rmax); 785 } 786 787 static int apply_hw_params_format_bits(struct snd_mask *fmt, u64 fbits) 788 { 789 u32 oldbits[2]; 790 int changed; 791 792 oldbits[0] = fmt->bits[0]; 793 oldbits[1] = fmt->bits[1]; 794 fmt->bits[0] &= (u32)fbits; 795 fmt->bits[1] &= (u32)(fbits >> 32); 796 if (!fmt->bits[0] && !fmt->bits[1]) { 797 hwc_debug(" --> get empty\n"); 798 return -EINVAL; 799 } 800 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]); 801 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed); 802 return changed; 803 } 804 805 static int hw_rule_format(struct snd_pcm_hw_params *params, 806 struct snd_pcm_hw_rule *rule) 807 { 808 struct snd_usb_substream *subs = rule->private; 809 const struct audioformat *fp; 810 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 811 u64 fbits; 812 813 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]); 814 fbits = 0; 815 list_for_each_entry(fp, &subs->fmt_list, list) { 816 if (!hw_check_valid_format(subs, params, fp)) 817 continue; 818 fbits |= fp->formats; 819 } 820 return apply_hw_params_format_bits(fmt, fbits); 821 } 822 823 static int hw_rule_period_time(struct snd_pcm_hw_params *params, 824 struct snd_pcm_hw_rule *rule) 825 { 826 struct snd_usb_substream *subs = rule->private; 827 const struct audioformat *fp; 828 struct snd_interval *it; 829 unsigned char min_datainterval; 830 unsigned int pmin; 831 832 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME); 833 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max); 834 min_datainterval = 0xff; 835 list_for_each_entry(fp, &subs->fmt_list, list) { 836 if (!hw_check_valid_format(subs, params, fp)) 837 continue; 838 min_datainterval = min(min_datainterval, fp->datainterval); 839 } 840 if (min_datainterval == 0xff) { 841 hwc_debug(" --> get empty\n"); 842 it->empty = 1; 843 return -EINVAL; 844 } 845 pmin = 125 * (1 << min_datainterval); 846 847 return apply_hw_params_minmax(it, pmin, UINT_MAX); 848 } 849 850 /* get the EP or the sync EP for implicit fb when it's already set up */ 851 static const struct snd_usb_endpoint * 852 get_sync_ep_from_substream(struct snd_usb_substream *subs) 853 { 854 struct snd_usb_audio *chip = subs->stream->chip; 855 const struct audioformat *fp; 856 const struct snd_usb_endpoint *ep; 857 858 list_for_each_entry(fp, &subs->fmt_list, list) { 859 ep = snd_usb_get_endpoint(chip, fp->endpoint); 860 if (ep && ep->cur_audiofmt) { 861 /* if EP is already opened solely for this substream, 862 * we still allow us to change the parameter; otherwise 863 * this substream has to follow the existing parameter 864 */ 865 if (ep->cur_audiofmt != subs->cur_audiofmt || ep->opened > 1) 866 return ep; 867 } 868 if (!fp->implicit_fb) 869 continue; 870 /* for the implicit fb, check the sync ep as well */ 871 ep = snd_usb_get_endpoint(chip, fp->sync_ep); 872 if (ep && ep->cur_audiofmt) 873 return ep; 874 } 875 return NULL; 876 } 877 878 /* additional hw constraints for implicit feedback mode */ 879 static int hw_rule_format_implicit_fb(struct snd_pcm_hw_params *params, 880 struct snd_pcm_hw_rule *rule) 881 { 882 struct snd_usb_substream *subs = rule->private; 883 const struct snd_usb_endpoint *ep; 884 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 885 886 ep = get_sync_ep_from_substream(subs); 887 if (!ep) 888 return 0; 889 890 hwc_debug("applying %s\n", __func__); 891 return apply_hw_params_format_bits(fmt, pcm_format_to_bits(ep->cur_format)); 892 } 893 894 static int hw_rule_rate_implicit_fb(struct snd_pcm_hw_params *params, 895 struct snd_pcm_hw_rule *rule) 896 { 897 struct snd_usb_substream *subs = rule->private; 898 const struct snd_usb_endpoint *ep; 899 struct snd_interval *it; 900 901 ep = get_sync_ep_from_substream(subs); 902 if (!ep) 903 return 0; 904 905 hwc_debug("applying %s\n", __func__); 906 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 907 return apply_hw_params_minmax(it, ep->cur_rate, ep->cur_rate); 908 } 909 910 static int hw_rule_period_size_implicit_fb(struct snd_pcm_hw_params *params, 911 struct snd_pcm_hw_rule *rule) 912 { 913 struct snd_usb_substream *subs = rule->private; 914 const struct snd_usb_endpoint *ep; 915 struct snd_interval *it; 916 917 ep = get_sync_ep_from_substream(subs); 918 if (!ep) 919 return 0; 920 921 hwc_debug("applying %s\n", __func__); 922 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 923 return apply_hw_params_minmax(it, ep->cur_period_frames, 924 ep->cur_period_frames); 925 } 926 927 static int hw_rule_periods_implicit_fb(struct snd_pcm_hw_params *params, 928 struct snd_pcm_hw_rule *rule) 929 { 930 struct snd_usb_substream *subs = rule->private; 931 const struct snd_usb_endpoint *ep; 932 struct snd_interval *it; 933 934 ep = get_sync_ep_from_substream(subs); 935 if (!ep) 936 return 0; 937 938 hwc_debug("applying %s\n", __func__); 939 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIODS); 940 return apply_hw_params_minmax(it, ep->cur_buffer_periods, 941 ep->cur_buffer_periods); 942 } 943 944 /* 945 * set up the runtime hardware information. 946 */ 947 948 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs) 949 { 950 const struct audioformat *fp; 951 unsigned int pt, ptmin; 952 int param_period_time_if_needed = -1; 953 int err; 954 955 runtime->hw.formats = subs->formats; 956 957 runtime->hw.rate_min = 0x7fffffff; 958 runtime->hw.rate_max = 0; 959 runtime->hw.channels_min = 256; 960 runtime->hw.channels_max = 0; 961 runtime->hw.rates = 0; 962 ptmin = UINT_MAX; 963 /* check min/max rates and channels */ 964 list_for_each_entry(fp, &subs->fmt_list, list) { 965 runtime->hw.rates |= fp->rates; 966 if (runtime->hw.rate_min > fp->rate_min) 967 runtime->hw.rate_min = fp->rate_min; 968 if (runtime->hw.rate_max < fp->rate_max) 969 runtime->hw.rate_max = fp->rate_max; 970 if (runtime->hw.channels_min > fp->channels) 971 runtime->hw.channels_min = fp->channels; 972 if (runtime->hw.channels_max < fp->channels) 973 runtime->hw.channels_max = fp->channels; 974 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) { 975 /* FIXME: there might be more than one audio formats... */ 976 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max = 977 fp->frame_size; 978 } 979 pt = 125 * (1 << fp->datainterval); 980 ptmin = min(ptmin, pt); 981 } 982 983 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME; 984 if (subs->speed == USB_SPEED_FULL) 985 /* full speed devices have fixed data packet interval */ 986 ptmin = 1000; 987 if (ptmin == 1000) 988 /* if period time doesn't go below 1 ms, no rules needed */ 989 param_period_time_if_needed = -1; 990 991 err = snd_pcm_hw_constraint_minmax(runtime, 992 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 993 ptmin, UINT_MAX); 994 if (err < 0) 995 return err; 996 997 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 998 hw_rule_rate, subs, 999 SNDRV_PCM_HW_PARAM_RATE, 1000 SNDRV_PCM_HW_PARAM_FORMAT, 1001 SNDRV_PCM_HW_PARAM_CHANNELS, 1002 param_period_time_if_needed, 1003 -1); 1004 if (err < 0) 1005 return err; 1006 1007 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 1008 hw_rule_channels, subs, 1009 SNDRV_PCM_HW_PARAM_CHANNELS, 1010 SNDRV_PCM_HW_PARAM_FORMAT, 1011 SNDRV_PCM_HW_PARAM_RATE, 1012 param_period_time_if_needed, 1013 -1); 1014 if (err < 0) 1015 return err; 1016 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 1017 hw_rule_format, subs, 1018 SNDRV_PCM_HW_PARAM_FORMAT, 1019 SNDRV_PCM_HW_PARAM_RATE, 1020 SNDRV_PCM_HW_PARAM_CHANNELS, 1021 param_period_time_if_needed, 1022 -1); 1023 if (err < 0) 1024 return err; 1025 if (param_period_time_if_needed >= 0) { 1026 err = snd_pcm_hw_rule_add(runtime, 0, 1027 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1028 hw_rule_period_time, subs, 1029 SNDRV_PCM_HW_PARAM_FORMAT, 1030 SNDRV_PCM_HW_PARAM_CHANNELS, 1031 SNDRV_PCM_HW_PARAM_RATE, 1032 -1); 1033 if (err < 0) 1034 return err; 1035 } 1036 1037 /* additional hw constraints for implicit fb */ 1038 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 1039 hw_rule_format_implicit_fb, subs, 1040 SNDRV_PCM_HW_PARAM_FORMAT, -1); 1041 if (err < 0) 1042 return err; 1043 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1044 hw_rule_rate_implicit_fb, subs, 1045 SNDRV_PCM_HW_PARAM_RATE, -1); 1046 if (err < 0) 1047 return err; 1048 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1049 hw_rule_period_size_implicit_fb, subs, 1050 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 1051 if (err < 0) 1052 return err; 1053 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 1054 hw_rule_periods_implicit_fb, subs, 1055 SNDRV_PCM_HW_PARAM_PERIODS, -1); 1056 if (err < 0) 1057 return err; 1058 1059 return 0; 1060 } 1061 1062 static int snd_usb_pcm_open(struct snd_pcm_substream *substream) 1063 { 1064 int direction = substream->stream; 1065 struct snd_usb_stream *as = snd_pcm_substream_chip(substream); 1066 struct snd_pcm_runtime *runtime = substream->runtime; 1067 struct snd_usb_substream *subs = &as->substream[direction]; 1068 int ret; 1069 1070 runtime->hw = snd_usb_hardware; 1071 runtime->private_data = subs; 1072 subs->pcm_substream = substream; 1073 /* runtime PM is also done there */ 1074 1075 /* initialize DSD/DOP context */ 1076 subs->dsd_dop.byte_idx = 0; 1077 subs->dsd_dop.channel = 0; 1078 subs->dsd_dop.marker = 1; 1079 1080 ret = setup_hw_info(runtime, subs); 1081 if (ret < 0) 1082 return ret; 1083 ret = snd_usb_autoresume(subs->stream->chip); 1084 if (ret < 0) 1085 return ret; 1086 ret = snd_media_stream_init(subs, as->pcm, direction); 1087 if (ret < 0) 1088 snd_usb_autosuspend(subs->stream->chip); 1089 return ret; 1090 } 1091 1092 static int snd_usb_pcm_close(struct snd_pcm_substream *substream) 1093 { 1094 int direction = substream->stream; 1095 struct snd_usb_stream *as = snd_pcm_substream_chip(substream); 1096 struct snd_usb_substream *subs = &as->substream[direction]; 1097 int ret; 1098 1099 snd_media_stop_pipeline(subs); 1100 1101 if (!snd_usb_lock_shutdown(subs->stream->chip)) { 1102 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1); 1103 snd_usb_unlock_shutdown(subs->stream->chip); 1104 if (ret < 0) 1105 return ret; 1106 } 1107 1108 subs->pcm_substream = NULL; 1109 snd_usb_autosuspend(subs->stream->chip); 1110 1111 return 0; 1112 } 1113 1114 /* Since a URB can handle only a single linear buffer, we must use double 1115 * buffering when the data to be transferred overflows the buffer boundary. 1116 * To avoid inconsistencies when updating hwptr_done, we use double buffering 1117 * for all URBs. 1118 */ 1119 static void retire_capture_urb(struct snd_usb_substream *subs, 1120 struct urb *urb) 1121 { 1122 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1123 unsigned int stride, frames, bytes, oldptr; 1124 int i, period_elapsed = 0; 1125 unsigned long flags; 1126 unsigned char *cp; 1127 int current_frame_number; 1128 1129 /* read frame number here, update pointer in critical section */ 1130 current_frame_number = usb_get_current_frame_number(subs->dev); 1131 1132 stride = runtime->frame_bits >> 3; 1133 1134 for (i = 0; i < urb->number_of_packets; i++) { 1135 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj; 1136 if (urb->iso_frame_desc[i].status && printk_ratelimit()) { 1137 dev_dbg(&subs->dev->dev, "frame %d active: %d\n", 1138 i, urb->iso_frame_desc[i].status); 1139 // continue; 1140 } 1141 bytes = urb->iso_frame_desc[i].actual_length; 1142 if (subs->stream_offset_adj > 0) { 1143 unsigned int adj = min(subs->stream_offset_adj, bytes); 1144 cp += adj; 1145 bytes -= adj; 1146 subs->stream_offset_adj -= adj; 1147 } 1148 frames = bytes / stride; 1149 if (!subs->txfr_quirk) 1150 bytes = frames * stride; 1151 if (bytes % (runtime->sample_bits >> 3) != 0) { 1152 int oldbytes = bytes; 1153 bytes = frames * stride; 1154 dev_warn_ratelimited(&subs->dev->dev, 1155 "Corrected urb data len. %d->%d\n", 1156 oldbytes, bytes); 1157 } 1158 /* update the current pointer */ 1159 spin_lock_irqsave(&subs->lock, flags); 1160 oldptr = subs->hwptr_done; 1161 subs->hwptr_done += bytes; 1162 if (subs->hwptr_done >= subs->buffer_bytes) 1163 subs->hwptr_done -= subs->buffer_bytes; 1164 frames = (bytes + (oldptr % stride)) / stride; 1165 subs->transfer_done += frames; 1166 if (subs->transfer_done >= runtime->period_size) { 1167 subs->transfer_done -= runtime->period_size; 1168 period_elapsed = 1; 1169 } 1170 1171 /* realign last_frame_number */ 1172 subs->last_frame_number = current_frame_number; 1173 1174 spin_unlock_irqrestore(&subs->lock, flags); 1175 /* copy a data chunk */ 1176 if (oldptr + bytes > subs->buffer_bytes) { 1177 unsigned int bytes1 = subs->buffer_bytes - oldptr; 1178 1179 memcpy(runtime->dma_area + oldptr, cp, bytes1); 1180 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1); 1181 } else { 1182 memcpy(runtime->dma_area + oldptr, cp, bytes); 1183 } 1184 } 1185 1186 if (period_elapsed) 1187 snd_pcm_period_elapsed(subs->pcm_substream); 1188 } 1189 1190 static void urb_ctx_queue_advance(struct snd_usb_substream *subs, 1191 struct urb *urb, unsigned int bytes) 1192 { 1193 struct snd_urb_ctx *ctx = urb->context; 1194 1195 ctx->queued += bytes; 1196 subs->inflight_bytes += bytes; 1197 subs->hwptr_done += bytes; 1198 if (subs->hwptr_done >= subs->buffer_bytes) 1199 subs->hwptr_done -= subs->buffer_bytes; 1200 } 1201 1202 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs, 1203 struct urb *urb, unsigned int bytes) 1204 { 1205 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1206 unsigned int dst_idx = 0; 1207 unsigned int src_idx = subs->hwptr_done; 1208 unsigned int wrap = subs->buffer_bytes; 1209 u8 *dst = urb->transfer_buffer; 1210 u8 *src = runtime->dma_area; 1211 u8 marker[] = { 0x05, 0xfa }; 1212 unsigned int queued = 0; 1213 1214 /* 1215 * The DSP DOP format defines a way to transport DSD samples over 1216 * normal PCM data endpoints. It requires stuffing of marker bytes 1217 * (0x05 and 0xfa, alternating per sample frame), and then expects 1218 * 2 additional bytes of actual payload. The whole frame is stored 1219 * LSB. 1220 * 1221 * Hence, for a stereo transport, the buffer layout looks like this, 1222 * where L refers to left channel samples and R to right. 1223 * 1224 * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa 1225 * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa 1226 * ..... 1227 * 1228 */ 1229 1230 while (bytes--) { 1231 if (++subs->dsd_dop.byte_idx == 3) { 1232 /* frame boundary? */ 1233 dst[dst_idx++] = marker[subs->dsd_dop.marker]; 1234 src_idx += 2; 1235 subs->dsd_dop.byte_idx = 0; 1236 1237 if (++subs->dsd_dop.channel % runtime->channels == 0) { 1238 /* alternate the marker */ 1239 subs->dsd_dop.marker++; 1240 subs->dsd_dop.marker %= ARRAY_SIZE(marker); 1241 subs->dsd_dop.channel = 0; 1242 } 1243 } else { 1244 /* stuff the DSD payload */ 1245 int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap; 1246 1247 if (subs->cur_audiofmt->dsd_bitrev) 1248 dst[dst_idx++] = bitrev8(src[idx]); 1249 else 1250 dst[dst_idx++] = src[idx]; 1251 queued++; 1252 } 1253 } 1254 1255 urb_ctx_queue_advance(subs, urb, queued); 1256 } 1257 1258 /* copy bit-reversed bytes onto transfer buffer */ 1259 static void fill_playback_urb_dsd_bitrev(struct snd_usb_substream *subs, 1260 struct urb *urb, unsigned int bytes) 1261 { 1262 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1263 const u8 *src = runtime->dma_area; 1264 u8 *buf = urb->transfer_buffer; 1265 int i, ofs = subs->hwptr_done; 1266 1267 for (i = 0; i < bytes; i++) { 1268 *buf++ = bitrev8(src[ofs]); 1269 if (++ofs >= subs->buffer_bytes) 1270 ofs = 0; 1271 } 1272 1273 urb_ctx_queue_advance(subs, urb, bytes); 1274 } 1275 1276 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb, 1277 int offset, int stride, unsigned int bytes) 1278 { 1279 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1280 1281 if (subs->hwptr_done + bytes > subs->buffer_bytes) { 1282 /* err, the transferred area goes over buffer boundary. */ 1283 unsigned int bytes1 = subs->buffer_bytes - subs->hwptr_done; 1284 1285 memcpy(urb->transfer_buffer + offset, 1286 runtime->dma_area + subs->hwptr_done, bytes1); 1287 memcpy(urb->transfer_buffer + offset + bytes1, 1288 runtime->dma_area, bytes - bytes1); 1289 } else { 1290 memcpy(urb->transfer_buffer + offset, 1291 runtime->dma_area + subs->hwptr_done, bytes); 1292 } 1293 1294 urb_ctx_queue_advance(subs, urb, bytes); 1295 } 1296 1297 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs, 1298 struct urb *urb, int stride, 1299 unsigned int bytes) 1300 { 1301 __le32 packet_length; 1302 int i; 1303 1304 /* Put __le32 length descriptor at start of each packet. */ 1305 for (i = 0; i < urb->number_of_packets; i++) { 1306 unsigned int length = urb->iso_frame_desc[i].length; 1307 unsigned int offset = urb->iso_frame_desc[i].offset; 1308 1309 packet_length = cpu_to_le32(length); 1310 offset += i * sizeof(packet_length); 1311 urb->iso_frame_desc[i].offset = offset; 1312 urb->iso_frame_desc[i].length += sizeof(packet_length); 1313 memcpy(urb->transfer_buffer + offset, 1314 &packet_length, sizeof(packet_length)); 1315 copy_to_urb(subs, urb, offset + sizeof(packet_length), 1316 stride, length); 1317 } 1318 /* Adjust transfer size accordingly. */ 1319 bytes += urb->number_of_packets * sizeof(packet_length); 1320 return bytes; 1321 } 1322 1323 static void prepare_playback_urb(struct snd_usb_substream *subs, 1324 struct urb *urb) 1325 { 1326 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1327 struct snd_usb_endpoint *ep = subs->data_endpoint; 1328 struct snd_urb_ctx *ctx = urb->context; 1329 unsigned int counts, frames, bytes; 1330 int i, stride, period_elapsed = 0; 1331 unsigned long flags; 1332 1333 stride = ep->stride; 1334 1335 frames = 0; 1336 ctx->queued = 0; 1337 urb->number_of_packets = 0; 1338 spin_lock_irqsave(&subs->lock, flags); 1339 subs->frame_limit += ep->max_urb_frames; 1340 for (i = 0; i < ctx->packets; i++) { 1341 counts = snd_usb_endpoint_next_packet_size(ep, ctx, i); 1342 /* set up descriptor */ 1343 urb->iso_frame_desc[i].offset = frames * stride; 1344 urb->iso_frame_desc[i].length = counts * stride; 1345 frames += counts; 1346 urb->number_of_packets++; 1347 subs->transfer_done += counts; 1348 if (subs->transfer_done >= runtime->period_size) { 1349 subs->transfer_done -= runtime->period_size; 1350 subs->frame_limit = 0; 1351 period_elapsed = 1; 1352 if (subs->fmt_type == UAC_FORMAT_TYPE_II) { 1353 if (subs->transfer_done > 0) { 1354 /* FIXME: fill-max mode is not 1355 * supported yet */ 1356 frames -= subs->transfer_done; 1357 counts -= subs->transfer_done; 1358 urb->iso_frame_desc[i].length = 1359 counts * stride; 1360 subs->transfer_done = 0; 1361 } 1362 i++; 1363 if (i < ctx->packets) { 1364 /* add a transfer delimiter */ 1365 urb->iso_frame_desc[i].offset = 1366 frames * stride; 1367 urb->iso_frame_desc[i].length = 0; 1368 urb->number_of_packets++; 1369 } 1370 break; 1371 } 1372 } 1373 /* finish at the period boundary or after enough frames */ 1374 if ((period_elapsed || 1375 subs->transfer_done >= subs->frame_limit) && 1376 !snd_usb_endpoint_implicit_feedback_sink(ep)) 1377 break; 1378 } 1379 bytes = frames * stride; 1380 1381 if (unlikely(ep->cur_format == SNDRV_PCM_FORMAT_DSD_U16_LE && 1382 subs->cur_audiofmt->dsd_dop)) { 1383 fill_playback_urb_dsd_dop(subs, urb, bytes); 1384 } else if (unlikely(ep->cur_format == SNDRV_PCM_FORMAT_DSD_U8 && 1385 subs->cur_audiofmt->dsd_bitrev)) { 1386 fill_playback_urb_dsd_bitrev(subs, urb, bytes); 1387 } else { 1388 /* usual PCM */ 1389 if (!subs->tx_length_quirk) 1390 copy_to_urb(subs, urb, 0, stride, bytes); 1391 else 1392 bytes = copy_to_urb_quirk(subs, urb, stride, bytes); 1393 /* bytes is now amount of outgoing data */ 1394 } 1395 1396 subs->last_frame_number = usb_get_current_frame_number(subs->dev); 1397 1398 if (subs->trigger_tstamp_pending_update) { 1399 /* this is the first actual URB submitted, 1400 * update trigger timestamp to reflect actual start time 1401 */ 1402 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 1403 subs->trigger_tstamp_pending_update = false; 1404 } 1405 1406 if (period_elapsed && !subs->running && !subs->early_playback_start) { 1407 subs->period_elapsed_pending = 1; 1408 period_elapsed = 0; 1409 } 1410 spin_unlock_irqrestore(&subs->lock, flags); 1411 urb->transfer_buffer_length = bytes; 1412 if (period_elapsed) 1413 snd_pcm_period_elapsed(subs->pcm_substream); 1414 } 1415 1416 /* 1417 * process after playback data complete 1418 * - decrease the delay count again 1419 */ 1420 static void retire_playback_urb(struct snd_usb_substream *subs, 1421 struct urb *urb) 1422 { 1423 unsigned long flags; 1424 struct snd_urb_ctx *ctx = urb->context; 1425 bool period_elapsed = false; 1426 1427 spin_lock_irqsave(&subs->lock, flags); 1428 if (ctx->queued) { 1429 if (subs->inflight_bytes >= ctx->queued) 1430 subs->inflight_bytes -= ctx->queued; 1431 else 1432 subs->inflight_bytes = 0; 1433 } 1434 1435 subs->last_frame_number = usb_get_current_frame_number(subs->dev); 1436 if (subs->running) { 1437 period_elapsed = subs->period_elapsed_pending; 1438 subs->period_elapsed_pending = 0; 1439 } 1440 spin_unlock_irqrestore(&subs->lock, flags); 1441 if (period_elapsed) 1442 snd_pcm_period_elapsed(subs->pcm_substream); 1443 } 1444 1445 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream, 1446 int cmd) 1447 { 1448 struct snd_usb_substream *subs = substream->runtime->private_data; 1449 int err; 1450 1451 switch (cmd) { 1452 case SNDRV_PCM_TRIGGER_START: 1453 subs->trigger_tstamp_pending_update = true; 1454 fallthrough; 1455 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 1456 snd_usb_endpoint_set_callback(subs->data_endpoint, 1457 prepare_playback_urb, 1458 retire_playback_urb, 1459 subs); 1460 if (!subs->early_playback_start && 1461 cmd == SNDRV_PCM_TRIGGER_START) { 1462 err = start_endpoints(subs); 1463 if (err < 0) { 1464 snd_usb_endpoint_set_callback(subs->data_endpoint, 1465 NULL, NULL, NULL); 1466 return err; 1467 } 1468 } 1469 subs->running = 1; 1470 dev_dbg(&subs->dev->dev, "%d:%d Start Playback PCM\n", 1471 subs->cur_audiofmt->iface, 1472 subs->cur_audiofmt->altsetting); 1473 return 0; 1474 case SNDRV_PCM_TRIGGER_SUSPEND: 1475 case SNDRV_PCM_TRIGGER_STOP: 1476 stop_endpoints(subs); 1477 snd_usb_endpoint_set_callback(subs->data_endpoint, 1478 NULL, NULL, NULL); 1479 subs->running = 0; 1480 dev_dbg(&subs->dev->dev, "%d:%d Stop Playback PCM\n", 1481 subs->cur_audiofmt->iface, 1482 subs->cur_audiofmt->altsetting); 1483 return 0; 1484 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 1485 /* keep retire_data_urb for delay calculation */ 1486 snd_usb_endpoint_set_callback(subs->data_endpoint, 1487 NULL, 1488 retire_playback_urb, 1489 subs); 1490 subs->running = 0; 1491 dev_dbg(&subs->dev->dev, "%d:%d Pause Playback PCM\n", 1492 subs->cur_audiofmt->iface, 1493 subs->cur_audiofmt->altsetting); 1494 return 0; 1495 } 1496 1497 return -EINVAL; 1498 } 1499 1500 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream, 1501 int cmd) 1502 { 1503 int err; 1504 struct snd_usb_substream *subs = substream->runtime->private_data; 1505 1506 switch (cmd) { 1507 case SNDRV_PCM_TRIGGER_START: 1508 err = start_endpoints(subs); 1509 if (err < 0) 1510 return err; 1511 fallthrough; 1512 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 1513 snd_usb_endpoint_set_callback(subs->data_endpoint, 1514 NULL, retire_capture_urb, 1515 subs); 1516 subs->last_frame_number = usb_get_current_frame_number(subs->dev); 1517 subs->running = 1; 1518 dev_dbg(&subs->dev->dev, "%d:%d Start Capture PCM\n", 1519 subs->cur_audiofmt->iface, 1520 subs->cur_audiofmt->altsetting); 1521 return 0; 1522 case SNDRV_PCM_TRIGGER_SUSPEND: 1523 case SNDRV_PCM_TRIGGER_STOP: 1524 stop_endpoints(subs); 1525 fallthrough; 1526 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 1527 snd_usb_endpoint_set_callback(subs->data_endpoint, 1528 NULL, NULL, NULL); 1529 subs->running = 0; 1530 dev_dbg(&subs->dev->dev, "%d:%d Stop Capture PCM\n", 1531 subs->cur_audiofmt->iface, 1532 subs->cur_audiofmt->altsetting); 1533 return 0; 1534 } 1535 1536 return -EINVAL; 1537 } 1538 1539 static const struct snd_pcm_ops snd_usb_playback_ops = { 1540 .open = snd_usb_pcm_open, 1541 .close = snd_usb_pcm_close, 1542 .hw_params = snd_usb_hw_params, 1543 .hw_free = snd_usb_hw_free, 1544 .prepare = snd_usb_pcm_prepare, 1545 .trigger = snd_usb_substream_playback_trigger, 1546 .sync_stop = snd_usb_pcm_sync_stop, 1547 .pointer = snd_usb_pcm_pointer, 1548 }; 1549 1550 static const struct snd_pcm_ops snd_usb_capture_ops = { 1551 .open = snd_usb_pcm_open, 1552 .close = snd_usb_pcm_close, 1553 .hw_params = snd_usb_hw_params, 1554 .hw_free = snd_usb_hw_free, 1555 .prepare = snd_usb_pcm_prepare, 1556 .trigger = snd_usb_substream_capture_trigger, 1557 .sync_stop = snd_usb_pcm_sync_stop, 1558 .pointer = snd_usb_pcm_pointer, 1559 }; 1560 1561 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream) 1562 { 1563 const struct snd_pcm_ops *ops; 1564 1565 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ? 1566 &snd_usb_playback_ops : &snd_usb_capture_ops; 1567 snd_pcm_set_ops(pcm, stream, ops); 1568 } 1569 1570 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs) 1571 { 1572 struct snd_pcm *pcm = subs->stream->pcm; 1573 struct snd_pcm_substream *s = pcm->streams[subs->direction].substream; 1574 struct device *dev = subs->dev->bus->sysdev; 1575 1576 if (snd_usb_use_vmalloc) 1577 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_VMALLOC, 1578 NULL, 0, 0); 1579 else 1580 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_DEV_SG, 1581 dev, 64*1024, 512*1024); 1582 } 1583