sound/usb/stream.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  */
   4
   5
   6 #include <linux/init.h>
   7 #include <linux/slab.h>
   8 #include <linux/usb.h>
   9 #include <linux/usb/audio.h>
  10 #include <linux/usb/audio-v2.h>
  11 #include <linux/usb/audio-v3.h>
  12
  13 #include <sound/core.h>
  14 #include <sound/pcm.h>
  15 #include <sound/control.h>
  16 #include <sound/tlv.h>
  17
  18 #include "usbaudio.h"
  19 #include "card.h"
  20 #include "proc.h"
  21 #include "quirks.h"
  22 #include "endpoint.h"
  23 #include "pcm.h"
  24 #include "helper.h"
  25 #include "format.h"
  26 #include "clock.h"
  27 #include "stream.h"
  28 #include "power.h"
  29 #include "media.h"
  30
  31 static void audioformat_free(struct audioformat *fp)
  32 {
  33         list_del(&fp->list); /* unlink for avoiding double-free */
  34         kfree(fp->rate_table);
  35         kfree(fp->chmap);
  36         kfree(fp);
  37 }
  38
  39 /*
  40  * free a substream
  41  */
  42 static void free_substream(struct snd_usb_substream *subs)
  43 {
  44         struct audioformat *fp, *n;
  45
  46         if (!subs->num_formats)
  47                 return; /* not initialized */
  48         list_for_each_entry_safe(fp, n, &subs->fmt_list, list)
  49                 audioformat_free(fp);
  50         kfree(subs->str_pd);
  51         snd_media_stream_delete(subs);
  52 }
  53
  54
  55 /*
  56  * free a usb stream instance
  57  */
  58 static void snd_usb_audio_stream_free(struct snd_usb_stream *stream)
  59 {
  60         free_substream(&stream->substream[0]);
  61         free_substream(&stream->substream[1]);
  62         list_del(&stream->list);
  63         kfree(stream);
  64 }
  65
  66 static void snd_usb_audio_pcm_free(struct snd_pcm *pcm)
  67 {
  68         struct snd_usb_stream *stream = pcm->private_data;
  69         if (stream) {
  70                 stream->pcm = NULL;
  71                 snd_usb_audio_stream_free(stream);
  72         }
  73 }
  74
  75 /*
  76  * initialize the substream instance.
  77  */
  78
  79 static void snd_usb_init_substream(struct snd_usb_stream *as,
  80                                    int stream,
  81                                    struct audioformat *fp,
  82                                    struct snd_usb_power_domain *pd)
  83 {
  84         struct snd_usb_substream *subs = &as->substream[stream];
  85
  86         INIT_LIST_HEAD(&subs->fmt_list);
  87         spin_lock_init(&subs->lock);
  88
  89         subs->stream = as;
  90         subs->direction = stream;
  91         subs->dev = as->chip->dev;
  92         subs->txfr_quirk = !!(as->chip->quirk_flags & QUIRK_FLAG_ALIGN_TRANSFER);
  93         subs->tx_length_quirk = !!(as->chip->quirk_flags & QUIRK_FLAG_TX_LENGTH);
  94         subs->speed = snd_usb_get_speed(subs->dev);
  95         subs->pkt_offset_adj = 0;
  96         subs->stream_offset_adj = 0;
  97
  98         snd_usb_set_pcm_ops(as->pcm, stream);
  99
 100         list_add_tail(&fp->list, &subs->fmt_list);
 101         subs->formats |= fp->formats;
 102         subs->num_formats++;
 103         subs->fmt_type = fp->fmt_type;
 104         subs->ep_num = fp->endpoint;
 105         if (fp->channels > subs->channels_max)
 106                 subs->channels_max = fp->channels;
 107
 108         if (pd) {
 109                 subs->str_pd = pd;
 110                 /* Initialize Power Domain to idle status D1 */
 111                 snd_usb_power_domain_set(subs->stream->chip, pd,
 112                                          UAC3_PD_STATE_D1);
 113         }
 114
 115         snd_usb_preallocate_buffer(subs);
 116 }
 117
 118 /* kctl callbacks for usb-audio channel maps */
 119 static int usb_chmap_ctl_info(struct snd_kcontrol *kcontrol,
 120                               struct snd_ctl_elem_info *uinfo)
 121 {
 122         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
 123         struct snd_usb_substream *subs = info->private_data;
 124
 125         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 126         uinfo->count = subs->channels_max;
 127         uinfo->value.integer.min = 0;
 128         uinfo->value.integer.max = SNDRV_CHMAP_LAST;
 129         return 0;
 130 }
 131
 132 /* check whether a duplicated entry exists in the audiofmt list */
 133 static bool have_dup_chmap(struct snd_usb_substream *subs,
 134                            struct audioformat *fp)
 135 {
 136         struct audioformat *prev = fp;
 137
 138         list_for_each_entry_continue_reverse(prev, &subs->fmt_list, list) {
 139                 if (prev->chmap &&
 140                     !memcmp(prev->chmap, fp->chmap, sizeof(*fp->chmap)))
 141                         return true;
 142         }
 143         return false;
 144 }
 145
 146 static int usb_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
 147                              unsigned int size, unsigned int __user *tlv)
 148 {
 149         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
 150         struct snd_usb_substream *subs = info->private_data;
 151         struct audioformat *fp;
 152         unsigned int __user *dst;
 153         int count = 0;
 154
 155         if (size < 8)
 156                 return -ENOMEM;
 157         if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
 158                 return -EFAULT;
 159         size -= 8;
 160         dst = tlv + 2;
 161         list_for_each_entry(fp, &subs->fmt_list, list) {
 162                 int i, ch_bytes;
 163
 164                 if (!fp->chmap)
 165                         continue;
 166                 if (have_dup_chmap(subs, fp))
 167                         continue;
 168                 /* copy the entry */
 169                 ch_bytes = fp->chmap->channels * 4;
 170                 if (size < 8 + ch_bytes)
 171                         return -ENOMEM;
 172                 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
 173                     put_user(ch_bytes, dst + 1))
 174                         return -EFAULT;
 175                 dst += 2;
 176                 for (i = 0; i < fp->chmap->channels; i++, dst++) {
 177                         if (put_user(fp->chmap->map[i], dst))
 178                                 return -EFAULT;
 179                 }
 180
 181                 count += 8 + ch_bytes;
 182                 size -= 8 + ch_bytes;
 183         }
 184         if (put_user(count, tlv + 1))
 185                 return -EFAULT;
 186         return 0;
 187 }
 188
 189 static int usb_chmap_ctl_get(struct snd_kcontrol *kcontrol,
 190                              struct snd_ctl_elem_value *ucontrol)
 191 {
 192         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
 193         struct snd_usb_substream *subs = info->private_data;
 194         struct snd_pcm_chmap_elem *chmap = NULL;
 195         int i = 0;
 196
 197         if (subs->cur_audiofmt)
 198                 chmap = subs->cur_audiofmt->chmap;
 199         if (chmap) {
 200                 for (i = 0; i < chmap->channels; i++)
 201                         ucontrol->value.integer.value[i] = chmap->map[i];
 202         }
 203         for (; i < subs->channels_max; i++)
 204                 ucontrol->value.integer.value[i] = 0;
 205         return 0;
 206 }
 207
 208 /* create a chmap kctl assigned to the given USB substream */
 209 static int add_chmap(struct snd_pcm *pcm, int stream,
 210                      struct snd_usb_substream *subs)
 211 {
 212         struct audioformat *fp;
 213         struct snd_pcm_chmap *chmap;
 214         struct snd_kcontrol *kctl;
 215         int err;
 216
 217         list_for_each_entry(fp, &subs->fmt_list, list)
 218                 if (fp->chmap)
 219                         goto ok;
 220         /* no chmap is found */
 221         return 0;
 222
 223  ok:
 224         err = snd_pcm_add_chmap_ctls(pcm, stream, NULL, 0, 0, &chmap);
 225         if (err < 0)
 226                 return err;
 227
 228         /* override handlers */
 229         chmap->private_data = subs;
 230         kctl = chmap->kctl;
 231         kctl->info = usb_chmap_ctl_info;
 232         kctl->get = usb_chmap_ctl_get;
 233         kctl->tlv.c = usb_chmap_ctl_tlv;
 234
 235         return 0;
 236 }
 237
 238 /* convert from USB ChannelConfig bits to ALSA chmap element */
 239 static struct snd_pcm_chmap_elem *convert_chmap(int channels, unsigned int bits,
 240                                                 int protocol)
 241 {
 242         static const unsigned int uac1_maps[] = {
 243                 SNDRV_CHMAP_FL,         /* left front */
 244                 SNDRV_CHMAP_FR,         /* right front */
 245                 SNDRV_CHMAP_FC,         /* center front */
 246                 SNDRV_CHMAP_LFE,        /* LFE */
 247                 SNDRV_CHMAP_RL,         /* left surround */
 248                 SNDRV_CHMAP_RR,         /* right surround */
 249                 SNDRV_CHMAP_FLC,        /* left of center */
 250                 SNDRV_CHMAP_FRC,        /* right of center */
 251                 SNDRV_CHMAP_RC,         /* surround */
 252                 SNDRV_CHMAP_SL,         /* side left */
 253                 SNDRV_CHMAP_SR,         /* side right */
 254                 SNDRV_CHMAP_TC,         /* top */
 255                 0 /* terminator */
 256         };
 257         static const unsigned int uac2_maps[] = {
 258                 SNDRV_CHMAP_FL,         /* front left */
 259                 SNDRV_CHMAP_FR,         /* front right */
 260                 SNDRV_CHMAP_FC,         /* front center */
 261                 SNDRV_CHMAP_LFE,        /* LFE */
 262                 SNDRV_CHMAP_RL,         /* back left */
 263                 SNDRV_CHMAP_RR,         /* back right */
 264                 SNDRV_CHMAP_FLC,        /* front left of center */
 265                 SNDRV_CHMAP_FRC,        /* front right of center */
 266                 SNDRV_CHMAP_RC,         /* back center */
 267                 SNDRV_CHMAP_SL,         /* side left */
 268                 SNDRV_CHMAP_SR,         /* side right */
 269                 SNDRV_CHMAP_TC,         /* top center */
 270                 SNDRV_CHMAP_TFL,        /* top front left */
 271                 SNDRV_CHMAP_TFC,        /* top front center */
 272                 SNDRV_CHMAP_TFR,        /* top front right */
 273                 SNDRV_CHMAP_TRL,        /* top back left */
 274                 SNDRV_CHMAP_TRC,        /* top back center */
 275                 SNDRV_CHMAP_TRR,        /* top back right */
 276                 SNDRV_CHMAP_TFLC,       /* top front left of center */
 277                 SNDRV_CHMAP_TFRC,       /* top front right of center */
 278                 SNDRV_CHMAP_LLFE,       /* left LFE */
 279                 SNDRV_CHMAP_RLFE,       /* right LFE */
 280                 SNDRV_CHMAP_TSL,        /* top side left */
 281                 SNDRV_CHMAP_TSR,        /* top side right */
 282                 SNDRV_CHMAP_BC,         /* bottom center */
 283                 SNDRV_CHMAP_RLC,        /* back left of center */
 284                 SNDRV_CHMAP_RRC,        /* back right of center */
 285                 0 /* terminator */
 286         };
 287         struct snd_pcm_chmap_elem *chmap;
 288         const unsigned int *maps;
 289         int c;
 290
 291         if (channels > ARRAY_SIZE(chmap->map))
 292                 return NULL;
 293
 294         chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
 295         if (!chmap)
 296                 return NULL;
 297
 298         maps = protocol == UAC_VERSION_2 ? uac2_maps : uac1_maps;
 299         chmap->channels = channels;
 300         c = 0;
 301
 302         if (bits) {
 303                 for (; bits && *maps; maps++, bits >>= 1) {
 304                         if (bits & 1)
 305                                 chmap->map[c++] = *maps;
 306                         if (c == chmap->channels)
 307                                 break;
 308                 }
 309         } else {
 310                 /* If we're missing wChannelConfig, then guess something
 311                     to make sure the channel map is not skipped entirely */
 312                 if (channels == 1)
 313                         chmap->map[c++] = SNDRV_CHMAP_MONO;
 314                 else
 315                         for (; c < channels && *maps; maps++)
 316                                 chmap->map[c++] = *maps;
 317         }
 318
 319         for (; c < channels; c++)
 320                 chmap->map[c] = SNDRV_CHMAP_UNKNOWN;
 321
 322         return chmap;
 323 }
 324
 325 /* UAC3 device stores channels information in Cluster Descriptors */
 326 static struct
 327 snd_pcm_chmap_elem *convert_chmap_v3(struct uac3_cluster_header_descriptor
 328                                                                 *cluster)
 329 {
 330         unsigned int channels = cluster->bNrChannels;
 331         struct snd_pcm_chmap_elem *chmap;
 332         void *p = cluster;
 333         int len, c;
 334
 335         if (channels > ARRAY_SIZE(chmap->map))
 336                 return NULL;
 337
 338         chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
 339         if (!chmap)
 340                 return NULL;
 341
 342         len = le16_to_cpu(cluster->wLength);
 343         c = 0;
 344         p += sizeof(struct uac3_cluster_header_descriptor);
 345
 346         while (((p - (void *)cluster) < len) && (c < channels)) {
 347                 struct uac3_cluster_segment_descriptor *cs_desc = p;
 348                 u16 cs_len;
 349                 u8 cs_type;
 350
 351                 cs_len = le16_to_cpu(cs_desc->wLength);
 352                 cs_type = cs_desc->bSegmentType;
 353
 354                 if (cs_type == UAC3_CHANNEL_INFORMATION) {
 355                         struct uac3_cluster_information_segment_descriptor *is = p;
 356                         unsigned char map;
 357
 358                         /*
 359                          * TODO: this conversion is not complete, update it
 360                          * after adding UAC3 values to asound.h
 361                          */
 362                         switch (is->bChRelationship) {
 363                         case UAC3_CH_MONO:
 364                                 map = SNDRV_CHMAP_MONO;
 365                                 break;
 366                         case UAC3_CH_LEFT:
 367                         case UAC3_CH_FRONT_LEFT:
 368                         case UAC3_CH_HEADPHONE_LEFT:
 369                                 map = SNDRV_CHMAP_FL;
 370                                 break;
 371                         case UAC3_CH_RIGHT:
 372                         case UAC3_CH_FRONT_RIGHT:
 373                         case UAC3_CH_HEADPHONE_RIGHT:
 374                                 map = SNDRV_CHMAP_FR;
 375                                 break;
 376                         case UAC3_CH_FRONT_CENTER:
 377                                 map = SNDRV_CHMAP_FC;
 378                                 break;
 379                         case UAC3_CH_FRONT_LEFT_OF_CENTER:
 380                                 map = SNDRV_CHMAP_FLC;
 381                                 break;
 382                         case UAC3_CH_FRONT_RIGHT_OF_CENTER:
 383                                 map = SNDRV_CHMAP_FRC;
 384                                 break;
 385                         case UAC3_CH_SIDE_LEFT:
 386                                 map = SNDRV_CHMAP_SL;
 387                                 break;
 388                         case UAC3_CH_SIDE_RIGHT:
 389                                 map = SNDRV_CHMAP_SR;
 390                                 break;
 391                         case UAC3_CH_BACK_LEFT:
 392                                 map = SNDRV_CHMAP_RL;
 393                                 break;
 394                         case UAC3_CH_BACK_RIGHT:
 395                                 map = SNDRV_CHMAP_RR;
 396                                 break;
 397                         case UAC3_CH_BACK_CENTER:
 398                                 map = SNDRV_CHMAP_RC;
 399                                 break;
 400                         case UAC3_CH_BACK_LEFT_OF_CENTER:
 401                                 map = SNDRV_CHMAP_RLC;
 402                                 break;
 403                         case UAC3_CH_BACK_RIGHT_OF_CENTER:
 404                                 map = SNDRV_CHMAP_RRC;
 405                                 break;
 406                         case UAC3_CH_TOP_CENTER:
 407                                 map = SNDRV_CHMAP_TC;
 408                                 break;
 409                         case UAC3_CH_TOP_FRONT_LEFT:
 410                                 map = SNDRV_CHMAP_TFL;
 411                                 break;
 412                         case UAC3_CH_TOP_FRONT_RIGHT:
 413                                 map = SNDRV_CHMAP_TFR;
 414                                 break;
 415                         case UAC3_CH_TOP_FRONT_CENTER:
 416                                 map = SNDRV_CHMAP_TFC;
 417                                 break;
 418                         case UAC3_CH_TOP_FRONT_LOC:
 419                                 map = SNDRV_CHMAP_TFLC;
 420                                 break;
 421                         case UAC3_CH_TOP_FRONT_ROC:
 422                                 map = SNDRV_CHMAP_TFRC;
 423                                 break;
 424                         case UAC3_CH_TOP_SIDE_LEFT:
 425                                 map = SNDRV_CHMAP_TSL;
 426                                 break;
 427                         case UAC3_CH_TOP_SIDE_RIGHT:
 428                                 map = SNDRV_CHMAP_TSR;
 429                                 break;
 430                         case UAC3_CH_TOP_BACK_LEFT:
 431                                 map = SNDRV_CHMAP_TRL;
 432                                 break;
 433                         case UAC3_CH_TOP_BACK_RIGHT:
 434                                 map = SNDRV_CHMAP_TRR;
 435                                 break;
 436                         case UAC3_CH_TOP_BACK_CENTER:
 437                                 map = SNDRV_CHMAP_TRC;
 438                                 break;
 439                         case UAC3_CH_BOTTOM_CENTER:
 440                                 map = SNDRV_CHMAP_BC;
 441                                 break;
 442                         case UAC3_CH_LOW_FREQUENCY_EFFECTS:
 443                                 map = SNDRV_CHMAP_LFE;
 444                                 break;
 445                         case UAC3_CH_LFE_LEFT:
 446                                 map = SNDRV_CHMAP_LLFE;
 447                                 break;
 448                         case UAC3_CH_LFE_RIGHT:
 449                                 map = SNDRV_CHMAP_RLFE;
 450                                 break;
 451                         case UAC3_CH_RELATIONSHIP_UNDEFINED:
 452                         default:
 453                                 map = SNDRV_CHMAP_UNKNOWN;
 454                                 break;
 455                         }
 456                         chmap->map[c++] = map;
 457                 }
 458                 p += cs_len;
 459         }
 460
 461         if (channels < c)
 462                 pr_err("%s: channel number mismatch\n", __func__);
 463
 464         chmap->channels = channels;
 465
 466         for (; c < channels; c++)
 467                 chmap->map[c] = SNDRV_CHMAP_UNKNOWN;
 468
 469         return chmap;
 470 }
 471
 472 /*
 473  * add this endpoint to the chip instance.
 474  * if a stream with the same endpoint already exists, append to it.
 475  * if not, create a new pcm stream. note, fp is added to the substream
 476  * fmt_list and will be freed on the chip instance release. do not free
 477  * fp or do remove it from the substream fmt_list to avoid double-free.
 478  */
 479 static int __snd_usb_add_audio_stream(struct snd_usb_audio *chip,
 480                                       int stream,
 481                                       struct audioformat *fp,
 482                                       struct snd_usb_power_domain *pd)
 483
 484 {
 485         struct snd_usb_stream *as;
 486         struct snd_usb_substream *subs;
 487         struct snd_pcm *pcm;
 488         int err;
 489
 490         list_for_each_entry(as, &chip->pcm_list, list) {
 491                 if (as->fmt_type != fp->fmt_type)
 492                         continue;
 493                 subs = &as->substream[stream];
 494                 if (subs->ep_num == fp->endpoint) {
 495                         list_add_tail(&fp->list, &subs->fmt_list);
 496                         subs->num_formats++;
 497                         subs->formats |= fp->formats;
 498                         return 0;
 499                 }
 500         }
 501
 502         if (chip->card->registered)
 503                 chip->need_delayed_register = true;
 504
 505         /* look for an empty stream */
 506         list_for_each_entry(as, &chip->pcm_list, list) {
 507                 if (as->fmt_type != fp->fmt_type)
 508                         continue;
 509                 subs = &as->substream[stream];
 510                 if (subs->ep_num)
 511                         continue;
 512                 err = snd_pcm_new_stream(as->pcm, stream, 1);
 513                 if (err < 0)
 514                         return err;
 515                 snd_usb_init_substream(as, stream, fp, pd);
 516                 return add_chmap(as->pcm, stream, subs);
 517         }
 518
 519         /* create a new pcm */
 520         as = kzalloc(sizeof(*as), GFP_KERNEL);
 521         if (!as)
 522                 return -ENOMEM;
 523         as->pcm_index = chip->pcm_devs;
 524         as->chip = chip;
 525         as->fmt_type = fp->fmt_type;
 526         err = snd_pcm_new(chip->card, "USB Audio", chip->pcm_devs,
 527                           stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0,
 528                           stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1,
 529                           &pcm);
 530         if (err < 0) {
 531                 kfree(as);
 532                 return err;
 533         }
 534         as->pcm = pcm;
 535         pcm->private_data = as;
 536         pcm->private_free = snd_usb_audio_pcm_free;
 537         pcm->info_flags = 0;
 538         if (chip->pcm_devs > 0)
 539                 sprintf(pcm->name, "USB Audio #%d", chip->pcm_devs);
 540         else
 541                 strcpy(pcm->name, "USB Audio");
 542
 543         snd_usb_init_substream(as, stream, fp, pd);
 544
 545         /*
 546          * Keep using head insertion for M-Audio Audiophile USB (tm) which has a
 547          * fix to swap capture stream order in conf/cards/USB-audio.conf
 548          */
 549         if (chip->usb_id == USB_ID(0x0763, 0x2003))
 550                 list_add(&as->list, &chip->pcm_list);
 551         else
 552                 list_add_tail(&as->list, &chip->pcm_list);
 553
 554         chip->pcm_devs++;
 555
 556         snd_usb_proc_pcm_format_add(as);
 557
 558         return add_chmap(pcm, stream, &as->substream[stream]);
 559 }
 560
 561 int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
 562                              int stream,
 563                              struct audioformat *fp)
 564 {
 565         return __snd_usb_add_audio_stream(chip, stream, fp, NULL);
 566 }
 567
 568 static int snd_usb_add_audio_stream_v3(struct snd_usb_audio *chip,
 569                                        int stream,
 570                                        struct audioformat *fp,
 571                                        struct snd_usb_power_domain *pd)
 572 {
 573         return __snd_usb_add_audio_stream(chip, stream, fp, pd);
 574 }
 575
 576 static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
 577                                          struct usb_host_interface *alts,
 578                                          int protocol, int iface_no)
 579 {
 580         /* parsed with a v1 header here. that's ok as we only look at the
 581          * header first which is the same for both versions */
 582         struct uac_iso_endpoint_descriptor *csep;
 583         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
 584         int attributes = 0;
 585
 586         csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
 587
 588         /* Creamware Noah has this descriptor after the 2nd endpoint */
 589         if (!csep && altsd->bNumEndpoints >= 2)
 590                 csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
 591
 592         /*
 593          * If we can't locate the USB_DT_CS_ENDPOINT descriptor in the extra
 594          * bytes after the first endpoint, go search the entire interface.
 595          * Some devices have it directly *before* the standard endpoint.
 596          */
 597         if (!csep)
 598                 csep = snd_usb_find_desc(alts->extra, alts->extralen, NULL, USB_DT_CS_ENDPOINT);
 599
 600         if (!csep || csep->bLength < 7 ||
 601             csep->bDescriptorSubtype != UAC_EP_GENERAL)
 602                 goto error;
 603
 604         if (protocol == UAC_VERSION_1) {
 605                 attributes = csep->bmAttributes;
 606         } else if (protocol == UAC_VERSION_2) {
 607                 struct uac2_iso_endpoint_descriptor *csep2 =
 608                         (struct uac2_iso_endpoint_descriptor *) csep;
 609
 610                 if (csep2->bLength < sizeof(*csep2))
 611                         goto error;
 612                 attributes = csep->bmAttributes & UAC_EP_CS_ATTR_FILL_MAX;
 613
 614                 /* emulate the endpoint attributes of a v1 device */
 615                 if (csep2->bmControls & UAC2_CONTROL_PITCH)
 616                         attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
 617         } else { /* UAC_VERSION_3 */
 618                 struct uac3_iso_endpoint_descriptor *csep3 =
 619                         (struct uac3_iso_endpoint_descriptor *) csep;
 620
 621                 if (csep3->bLength < sizeof(*csep3))
 622                         goto error;
 623                 /* emulate the endpoint attributes of a v1 device */
 624                 if (le32_to_cpu(csep3->bmControls) & UAC2_CONTROL_PITCH)
 625                         attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
 626         }
 627
 628         return attributes;
 629
 630  error:
 631         usb_audio_warn(chip,
 632                        "%u:%d : no or invalid class specific endpoint descriptor\n",
 633                        iface_no, altsd->bAlternateSetting);
 634         return 0;
 635 }
 636
 637 /* find an input terminal descriptor (either UAC1 or UAC2) with the given
 638  * terminal id
 639  */
 640 static void *
 641 snd_usb_find_input_terminal_descriptor(struct usb_host_interface *ctrl_iface,
 642                                        int terminal_id, int protocol)
 643 {
 644         struct uac2_input_terminal_descriptor *term = NULL;
 645
 646         while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
 647                                                ctrl_iface->extralen,
 648                                                term, UAC_INPUT_TERMINAL))) {
 649                 if (!snd_usb_validate_audio_desc(term, protocol))
 650                         continue;
 651                 if (term->bTerminalID == terminal_id)
 652                         return term;
 653         }
 654
 655         return NULL;
 656 }
 657
 658 static void *
 659 snd_usb_find_output_terminal_descriptor(struct usb_host_interface *ctrl_iface,
 660                                         int terminal_id, int protocol)
 661 {
 662         /* OK to use with both UAC2 and UAC3 */
 663         struct uac2_output_terminal_descriptor *term = NULL;
 664
 665         while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
 666                                                ctrl_iface->extralen,
 667                                                term, UAC_OUTPUT_TERMINAL))) {
 668                 if (!snd_usb_validate_audio_desc(term, protocol))
 669                         continue;
 670                 if (term->bTerminalID == terminal_id)
 671                         return term;
 672         }
 673
 674         return NULL;
 675 }
 676
 677 static struct audioformat *
 678 audio_format_alloc_init(struct snd_usb_audio *chip,
 679                        struct usb_host_interface *alts,
 680                        int protocol, int iface_no, int altset_idx,
 681                        int altno, int num_channels, int clock)
 682 {
 683         struct audioformat *fp;
 684
 685         fp = kzalloc(sizeof(*fp), GFP_KERNEL);
 686         if (!fp)
 687                 return NULL;
 688
 689         fp->iface = iface_no;
 690         fp->altsetting = altno;
 691         fp->altset_idx = altset_idx;
 692         fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
 693         fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
 694         fp->datainterval = snd_usb_parse_datainterval(chip, alts);
 695         fp->protocol = protocol;
 696         fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
 697         fp->channels = num_channels;
 698         if (snd_usb_get_speed(chip->dev) == USB_SPEED_HIGH)
 699                 fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
 700                                 * (fp->maxpacksize & 0x7ff);
 701         fp->clock = clock;
 702         INIT_LIST_HEAD(&fp->list);
 703
 704         return fp;
 705 }
 706
 707 static struct audioformat *
 708 snd_usb_get_audioformat_uac12(struct snd_usb_audio *chip,
 709                               struct usb_host_interface *alts,
 710                               int protocol, int iface_no, int altset_idx,
 711                               int altno, int stream, int bm_quirk)
 712 {
 713         struct usb_device *dev = chip->dev;
 714         struct uac_format_type_i_continuous_descriptor *fmt;
 715         unsigned int num_channels = 0, chconfig = 0;
 716         struct usb_host_interface *ctrl_intf;
 717         struct audioformat *fp;
 718         int clock = 0;
 719         u64 format;
 720
 721         ctrl_intf = snd_usb_find_ctrl_interface(chip, iface_no);
 722
 723         /* get audio formats */
 724         if (protocol == UAC_VERSION_1) {
 725                 struct uac1_as_header_descriptor *as =
 726                         snd_usb_find_csint_desc(alts->extra, alts->extralen,
 727                                                 NULL, UAC_AS_GENERAL);
 728                 struct uac_input_terminal_descriptor *iterm;
 729
 730                 if (!as) {
 731                         dev_err(&dev->dev,
 732                                 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
 733                                 iface_no, altno);
 734                         return NULL;
 735                 }
 736
 737                 if (as->bLength < sizeof(*as)) {
 738                         dev_err(&dev->dev,
 739                                 "%u:%d : invalid UAC_AS_GENERAL desc\n",
 740                                 iface_no, altno);
 741                         return NULL;
 742                 }
 743
 744                 format = le16_to_cpu(as->wFormatTag); /* remember the format value */
 745
 746                 iterm = snd_usb_find_input_terminal_descriptor(ctrl_intf,
 747                                                                as->bTerminalLink,
 748                                                                protocol);
 749                 if (iterm) {
 750                         num_channels = iterm->bNrChannels;
 751                         chconfig = le16_to_cpu(iterm->wChannelConfig);
 752                 }
 753         } else { /* UAC_VERSION_2 */
 754                 struct uac2_input_terminal_descriptor *input_term;
 755                 struct uac2_output_terminal_descriptor *output_term;
 756                 struct uac2_as_header_descriptor *as =
 757                         snd_usb_find_csint_desc(alts->extra, alts->extralen,
 758                                                 NULL, UAC_AS_GENERAL);
 759
 760                 if (!as) {
 761                         dev_err(&dev->dev,
 762                                 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
 763                                 iface_no, altno);
 764                         return NULL;
 765                 }
 766
 767                 if (as->bLength < sizeof(*as)) {
 768                         dev_err(&dev->dev,
 769                                 "%u:%d : invalid UAC_AS_GENERAL desc\n",
 770                                 iface_no, altno);
 771                         return NULL;
 772                 }
 773
 774                 num_channels = as->bNrChannels;
 775                 format = le32_to_cpu(as->bmFormats);
 776                 chconfig = le32_to_cpu(as->bmChannelConfig);
 777
 778                 /*
 779                  * lookup the terminal associated to this interface
 780                  * to extract the clock
 781                  */
 782                 input_term = snd_usb_find_input_terminal_descriptor(ctrl_intf,
 783                                                                     as->bTerminalLink,
 784                                                                     protocol);
 785                 if (input_term) {
 786                         clock = input_term->bCSourceID;
 787                         if (!chconfig && (num_channels == input_term->bNrChannels))
 788                                 chconfig = le32_to_cpu(input_term->bmChannelConfig);
 789                         goto found_clock;
 790                 }
 791
 792                 output_term = snd_usb_find_output_terminal_descriptor(ctrl_intf,
 793                                                                       as->bTerminalLink,
 794                                                                       protocol);
 795                 if (output_term) {
 796                         clock = output_term->bCSourceID;
 797                         goto found_clock;
 798                 }
 799
 800                 dev_err(&dev->dev,
 801                         "%u:%d : bogus bTerminalLink %d\n",
 802                         iface_no, altno, as->bTerminalLink);
 803                 return NULL;
 804         }
 805
 806 found_clock:
 807         /* get format type */
 808         fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen,
 809                                       NULL, UAC_FORMAT_TYPE);
 810         if (!fmt) {
 811                 dev_err(&dev->dev,
 812                         "%u:%d : no UAC_FORMAT_TYPE desc\n",
 813                         iface_no, altno);
 814                 return NULL;
 815         }
 816         if (((protocol == UAC_VERSION_1) && (fmt->bLength < 8))
 817                         || ((protocol == UAC_VERSION_2) &&
 818                                         (fmt->bLength < 6))) {
 819                 dev_err(&dev->dev,
 820                         "%u:%d : invalid UAC_FORMAT_TYPE desc\n",
 821                         iface_no, altno);
 822                 return NULL;
 823         }
 824
 825         /*
 826          * Blue Microphones workaround: The last altsetting is
 827          * identical with the previous one, except for a larger
 828          * packet size, but is actually a mislabeled two-channel
 829          * setting; ignore it.
 830          *
 831          * Part 2: analyze quirk flag and format
 832          */
 833         if (bm_quirk && fmt->bNrChannels == 1 && fmt->bSubframeSize == 2)
 834                 return NULL;
 835
 836         fp = audio_format_alloc_init(chip, alts, protocol, iface_no,
 837                                      altset_idx, altno, num_channels, clock);
 838         if (!fp)
 839                 return ERR_PTR(-ENOMEM);
 840
 841         fp->attributes = parse_uac_endpoint_attributes(chip, alts, protocol,
 842                                                        iface_no);
 843
 844         /* some quirks for attributes here */
 845         snd_usb_audioformat_attributes_quirk(chip, fp, stream);
 846
 847         /* ok, let's parse further... */
 848         if (snd_usb_parse_audio_format(chip, fp, format,
 849                                         fmt, stream) < 0) {
 850                 audioformat_free(fp);
 851                 return NULL;
 852         }
 853
 854         /* Create chmap */
 855         if (fp->channels != num_channels)
 856                 chconfig = 0;
 857
 858         fp->chmap = convert_chmap(fp->channels, chconfig, protocol);
 859
 860         return fp;
 861 }
 862
 863 static struct audioformat *
 864 snd_usb_get_audioformat_uac3(struct snd_usb_audio *chip,
 865                              struct usb_host_interface *alts,
 866                              struct snd_usb_power_domain **pd_out,
 867                              int iface_no, int altset_idx,
 868                              int altno, int stream)
 869 {
 870         struct usb_device *dev = chip->dev;
 871         struct uac3_input_terminal_descriptor *input_term;
 872         struct uac3_output_terminal_descriptor *output_term;
 873         struct uac3_cluster_header_descriptor *cluster;
 874         struct uac3_as_header_descriptor *as = NULL;
 875         struct uac3_hc_descriptor_header hc_header;
 876         struct usb_host_interface *ctrl_intf;
 877         struct snd_pcm_chmap_elem *chmap;
 878         struct snd_usb_power_domain *pd;
 879         unsigned char badd_profile;
 880         u64 badd_formats = 0;
 881         unsigned int num_channels;
 882         struct audioformat *fp;
 883         u16 cluster_id, wLength;
 884         int clock = 0;
 885         int err;
 886
 887         badd_profile = chip->badd_profile;
 888         ctrl_intf = snd_usb_find_ctrl_interface(chip, iface_no);
 889
 890         if (badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
 891                 unsigned int maxpacksize =
 892                         le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
 893
 894                 switch (maxpacksize) {
 895                 default:
 896                         dev_err(&dev->dev,
 897                                 "%u:%d : incorrect wMaxPacketSize for BADD profile\n",
 898                                 iface_no, altno);
 899                         return NULL;
 900                 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_16:
 901                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_16:
 902                         badd_formats = SNDRV_PCM_FMTBIT_S16_LE;
 903                         num_channels = 1;
 904                         break;
 905                 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_24:
 906                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_24:
 907                         badd_formats = SNDRV_PCM_FMTBIT_S24_3LE;
 908                         num_channels = 1;
 909                         break;
 910                 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_16:
 911                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_16:
 912                         badd_formats = SNDRV_PCM_FMTBIT_S16_LE;
 913                         num_channels = 2;
 914                         break;
 915                 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_24:
 916                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_24:
 917                         badd_formats = SNDRV_PCM_FMTBIT_S24_3LE;
 918                         num_channels = 2;
 919                         break;
 920                 }
 921
 922                 chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
 923                 if (!chmap)
 924                         return ERR_PTR(-ENOMEM);
 925
 926                 if (num_channels == 1) {
 927                         chmap->map[0] = SNDRV_CHMAP_MONO;
 928                 } else {
 929                         chmap->map[0] = SNDRV_CHMAP_FL;
 930                         chmap->map[1] = SNDRV_CHMAP_FR;
 931                 }
 932
 933                 chmap->channels = num_channels;
 934                 clock = UAC3_BADD_CS_ID9;
 935                 goto found_clock;
 936         }
 937
 938         as = snd_usb_find_csint_desc(alts->extra, alts->extralen,
 939                                      NULL, UAC_AS_GENERAL);
 940         if (!as) {
 941                 dev_err(&dev->dev,
 942                         "%u:%d : UAC_AS_GENERAL descriptor not found\n",
 943                         iface_no, altno);
 944                 return NULL;
 945         }
 946
 947         if (as->bLength < sizeof(*as)) {
 948                 dev_err(&dev->dev,
 949                         "%u:%d : invalid UAC_AS_GENERAL desc\n",
 950                         iface_no, altno);
 951                 return NULL;
 952         }
 953
 954         cluster_id = le16_to_cpu(as->wClusterDescrID);
 955         if (!cluster_id) {
 956                 dev_err(&dev->dev,
 957                         "%u:%d : no cluster descriptor\n",
 958                         iface_no, altno);
 959                 return NULL;
 960         }
 961
 962         /*
 963          * Get number of channels and channel map through
 964          * High Capability Cluster Descriptor
 965          *
 966          * First step: get High Capability header and
 967          * read size of Cluster Descriptor
 968          */
 969         err = snd_usb_ctl_msg(chip->dev,
 970                         usb_rcvctrlpipe(chip->dev, 0),
 971                         UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
 972                         USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 973                         cluster_id,
 974                         snd_usb_ctrl_intf(ctrl_intf),
 975                         &hc_header, sizeof(hc_header));
 976         if (err < 0)
 977                 return ERR_PTR(err);
 978         else if (err != sizeof(hc_header)) {
 979                 dev_err(&dev->dev,
 980                         "%u:%d : can't get High Capability descriptor\n",
 981                         iface_no, altno);
 982                 return ERR_PTR(-EIO);
 983         }
 984
 985         /*
 986          * Second step: allocate needed amount of memory
 987          * and request Cluster Descriptor
 988          */
 989         wLength = le16_to_cpu(hc_header.wLength);
 990         cluster = kzalloc(wLength, GFP_KERNEL);
 991         if (!cluster)
 992                 return ERR_PTR(-ENOMEM);
 993         err = snd_usb_ctl_msg(chip->dev,
 994                         usb_rcvctrlpipe(chip->dev, 0),
 995                         UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
 996                         USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 997                         cluster_id,
 998                         snd_usb_ctrl_intf(ctrl_intf),
 999                         cluster, wLength);
1000         if (err < 0) {
1001                 kfree(cluster);
1002                 return ERR_PTR(err);
1003         } else if (err != wLength) {
1004                 dev_err(&dev->dev,
1005                         "%u:%d : can't get Cluster Descriptor\n",
1006                         iface_no, altno);
1007                 kfree(cluster);
1008                 return ERR_PTR(-EIO);
1009         }
1010
1011         num_channels = cluster->bNrChannels;
1012         chmap = convert_chmap_v3(cluster);
1013         kfree(cluster);
1014
1015         /*
1016          * lookup the terminal associated to this interface
1017          * to extract the clock
1018          */
1019         input_term = snd_usb_find_input_terminal_descriptor(ctrl_intf,
1020                                                             as->bTerminalLink,
1021                                                             UAC_VERSION_3);
1022         if (input_term) {
1023                 clock = input_term->bCSourceID;
1024                 goto found_clock;
1025         }
1026
1027         output_term = snd_usb_find_output_terminal_descriptor(ctrl_intf,
1028                                                               as->bTerminalLink,
1029                                                               UAC_VERSION_3);
1030         if (output_term) {
1031                 clock = output_term->bCSourceID;
1032                 goto found_clock;
1033         }
1034
1035         dev_err(&dev->dev, "%u:%d : bogus bTerminalLink %d\n",
1036                         iface_no, altno, as->bTerminalLink);
1037         kfree(chmap);
1038         return NULL;
1039
1040 found_clock:
1041         fp = audio_format_alloc_init(chip, alts, UAC_VERSION_3, iface_no,
1042                                      altset_idx, altno, num_channels, clock);
1043         if (!fp) {
1044                 kfree(chmap);
1045                 return ERR_PTR(-ENOMEM);
1046         }
1047
1048         fp->chmap = chmap;
1049
1050         if (badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
1051                 fp->attributes = 0; /* No attributes */
1052
1053                 fp->fmt_type = UAC_FORMAT_TYPE_I;
1054                 fp->formats = badd_formats;
1055
1056                 fp->nr_rates = 0;       /* SNDRV_PCM_RATE_CONTINUOUS */
1057                 fp->rate_min = UAC3_BADD_SAMPLING_RATE;
1058                 fp->rate_max = UAC3_BADD_SAMPLING_RATE;
1059                 fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
1060
1061                 pd = kzalloc(sizeof(*pd), GFP_KERNEL);
1062                 if (!pd) {
1063                         audioformat_free(fp);
1064                         return NULL;
1065                 }
1066                 pd->pd_id = (stream == SNDRV_PCM_STREAM_PLAYBACK) ?
1067                                         UAC3_BADD_PD_ID10 : UAC3_BADD_PD_ID11;
1068                 pd->pd_d1d0_rec = UAC3_BADD_PD_RECOVER_D1D0;
1069                 pd->pd_d2d0_rec = UAC3_BADD_PD_RECOVER_D2D0;
1070
1071         } else {
1072                 fp->attributes = parse_uac_endpoint_attributes(chip, alts,
1073                                                                UAC_VERSION_3,
1074                                                                iface_no);
1075
1076                 pd = snd_usb_find_power_domain(ctrl_intf,
1077                                                as->bTerminalLink);
1078
1079                 /* ok, let's parse further... */
1080                 if (snd_usb_parse_audio_format_v3(chip, fp, as, stream) < 0) {
1081                         kfree(pd);
1082                         audioformat_free(fp);
1083                         return NULL;
1084                 }
1085         }
1086
1087         if (pd)
1088                 *pd_out = pd;
1089
1090         return fp;
1091 }
1092
1093 static int __snd_usb_parse_audio_interface(struct snd_usb_audio *chip,
1094                                            int iface_no,
1095                                            bool *has_non_pcm, bool non_pcm)
1096 {
1097         struct usb_device *dev;
1098         struct usb_interface *iface;
1099         struct usb_host_interface *alts;
1100         struct usb_interface_descriptor *altsd;
1101         int i, altno, err, stream;
1102         struct audioformat *fp = NULL;
1103         struct snd_usb_power_domain *pd = NULL;
1104         bool set_iface_first;
1105         int num, protocol;
1106
1107         dev = chip->dev;
1108
1109         /* parse the interface's altsettings */
1110         iface = usb_ifnum_to_if(dev, iface_no);
1111
1112         num = iface->num_altsetting;
1113
1114         /*
1115          * Dallas DS4201 workaround: It presents 5 altsettings, but the last
1116          * one misses syncpipe, and does not produce any sound.
1117          */
1118         if (chip->usb_id == USB_ID(0x04fa, 0x4201) && num >= 4)
1119                 num = 4;
1120
1121         for (i = 0; i < num; i++) {
1122                 alts = &iface->altsetting[i];
1123                 altsd = get_iface_desc(alts);
1124                 protocol = altsd->bInterfaceProtocol;
1125                 /* skip invalid one */
1126                 if (((altsd->bInterfaceClass != USB_CLASS_AUDIO ||
1127                       (altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING &&
1128                        altsd->bInterfaceSubClass != USB_SUBCLASS_VENDOR_SPEC)) &&
1129                      altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
1130                     altsd->bNumEndpoints < 1 ||
1131                     le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) == 0)
1132                         continue;
1133                 /* must be isochronous */
1134                 if ((get_endpoint(alts, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
1135                     USB_ENDPOINT_XFER_ISOC)
1136                         continue;
1137                 /* check direction */
1138                 stream = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN) ?
1139                         SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
1140                 altno = altsd->bAlternateSetting;
1141
1142                 if (snd_usb_apply_interface_quirk(chip, iface_no, altno))
1143                         continue;
1144
1145                 /*
1146                  * Roland audio streaming interfaces are marked with protocols
1147                  * 0/1/2, but are UAC 1 compatible.
1148                  */
1149                 if (USB_ID_VENDOR(chip->usb_id) == 0x0582 &&
1150                     altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
1151                     protocol <= 2)
1152                         protocol = UAC_VERSION_1;
1153
1154                 switch (protocol) {
1155                 default:
1156                         dev_dbg(&dev->dev, "%u:%d: unknown interface protocol %#02x, assuming v1\n",
1157                                 iface_no, altno, protocol);
1158                         protocol = UAC_VERSION_1;
1159                         fallthrough;
1160                 case UAC_VERSION_1:
1161                 case UAC_VERSION_2: {
1162                         int bm_quirk = 0;
1163
1164                         /*
1165                          * Blue Microphones workaround: The last altsetting is
1166                          * identical with the previous one, except for a larger
1167                          * packet size, but is actually a mislabeled two-channel
1168                          * setting; ignore it.
1169                          *
1170                          * Part 1: prepare quirk flag
1171                          */
1172                         if (altno == 2 && num == 3 &&
1173                             fp && fp->altsetting == 1 && fp->channels == 1 &&
1174                             fp->formats == SNDRV_PCM_FMTBIT_S16_LE &&
1175                             protocol == UAC_VERSION_1 &&
1176                             le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) ==
1177                                                         fp->maxpacksize * 2)
1178                                 bm_quirk = 1;
1179
1180                         fp = snd_usb_get_audioformat_uac12(chip, alts, protocol,
1181                                                            iface_no, i, altno,
1182                                                            stream, bm_quirk);
1183                         break;
1184                 }
1185                 case UAC_VERSION_3:
1186                         fp = snd_usb_get_audioformat_uac3(chip, alts, &pd,
1187                                                 iface_no, i, altno, stream);
1188                         break;
1189                 }
1190
1191                 if (!fp)
1192                         continue;
1193                 else if (IS_ERR(fp))
1194                         return PTR_ERR(fp);
1195
1196                 if (fp->fmt_type != UAC_FORMAT_TYPE_I)
1197                         *has_non_pcm = true;
1198                 if ((fp->fmt_type == UAC_FORMAT_TYPE_I) == non_pcm) {
1199                         audioformat_free(fp);
1200                         kfree(pd);
1201                         fp = NULL;
1202                         pd = NULL;
1203                         continue;
1204                 }
1205
1206                 snd_usb_audioformat_set_sync_ep(chip, fp);
1207
1208                 dev_dbg(&dev->dev, "%u:%d: add audio endpoint %#x\n", iface_no, altno, fp->endpoint);
1209                 if (protocol == UAC_VERSION_3)
1210                         err = snd_usb_add_audio_stream_v3(chip, stream, fp, pd);
1211                 else
1212                         err = snd_usb_add_audio_stream(chip, stream, fp);
1213
1214                 if (err < 0) {
1215                         audioformat_free(fp);
1216                         kfree(pd);
1217                         return err;
1218                 }
1219
1220                 /* add endpoints */
1221                 err = snd_usb_add_endpoint(chip, fp->endpoint,
1222                                            SND_USB_ENDPOINT_TYPE_DATA);
1223                 if (err < 0)
1224                         return err;
1225
1226                 if (fp->sync_ep) {
1227                         err = snd_usb_add_endpoint(chip, fp->sync_ep,
1228                                                    fp->implicit_fb ?
1229                                                    SND_USB_ENDPOINT_TYPE_DATA :
1230                                                    SND_USB_ENDPOINT_TYPE_SYNC);
1231                         if (err < 0)
1232                                 return err;
1233                 }
1234
1235                 set_iface_first = false;
1236                 if (protocol == UAC_VERSION_1 ||
1237                     (chip->quirk_flags & QUIRK_FLAG_SET_IFACE_FIRST))
1238                         set_iface_first = true;
1239
1240                 /* try to set the interface... */
1241                 usb_set_interface(chip->dev, iface_no, 0);
1242                 if (set_iface_first)
1243                         usb_set_interface(chip->dev, iface_no, altno);
1244                 snd_usb_init_pitch(chip, fp);
1245                 snd_usb_init_sample_rate(chip, fp, fp->rate_max);
1246                 if (!set_iface_first)
1247                         usb_set_interface(chip->dev, iface_no, altno);
1248         }
1249         return 0;
1250 }
1251
1252 int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no)
1253 {
1254         int err;
1255         bool has_non_pcm = false;
1256
1257         /* parse PCM formats */
1258         err = __snd_usb_parse_audio_interface(chip, iface_no, &has_non_pcm, false);
1259         if (err < 0)
1260                 return err;
1261
1262         if (has_non_pcm) {
1263                 /* parse non-PCM formats */
1264                 err = __snd_usb_parse_audio_interface(chip, iface_no, &has_non_pcm, true);
1265                 if (err < 0)
1266                         return err;
1267         }
1268
1269         return 0;
1270 }
1271