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