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