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