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_SL,         /* left surround */
 248                 SNDRV_CHMAP_SR,         /* 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         } else {
 307                 /* If we're missing wChannelConfig, then guess something
 308                     to make sure the channel map is not skipped entirely */
 309                 if (channels == 1)
 310                         chmap->map[c++] = SNDRV_CHMAP_MONO;
 311                 else
 312                         for (; c < channels && *maps; maps++)
 313                                 chmap->map[c++] = *maps;
 314         }
 315
 316         for (; c < channels; c++)
 317                 chmap->map[c] = SNDRV_CHMAP_UNKNOWN;
 318
 319         return chmap;
 320 }
 321
 322 /* UAC3 device stores channels information in Cluster Descriptors */
 323 static struct
 324 snd_pcm_chmap_elem *convert_chmap_v3(struct uac3_cluster_header_descriptor
 325                                                                 *cluster)
 326 {
 327         unsigned int channels = cluster->bNrChannels;
 328         struct snd_pcm_chmap_elem *chmap;
 329         void *p = cluster;
 330         int len, c;
 331
 332         if (channels > ARRAY_SIZE(chmap->map))
 333                 return NULL;
 334
 335         chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
 336         if (!chmap)
 337                 return NULL;
 338
 339         len = le16_to_cpu(cluster->wLength);
 340         c = 0;
 341         p += sizeof(struct uac3_cluster_header_descriptor);
 342
 343         while (((p - (void *)cluster) < len) && (c < channels)) {
 344                 struct uac3_cluster_segment_descriptor *cs_desc = p;
 345                 u16 cs_len;
 346                 u8 cs_type;
 347
 348                 cs_len = le16_to_cpu(cs_desc->wLength);
 349                 cs_type = cs_desc->bSegmentType;
 350
 351                 if (cs_type == UAC3_CHANNEL_INFORMATION) {
 352                         struct uac3_cluster_information_segment_descriptor *is = p;
 353                         unsigned char map;
 354
 355                         /*
 356                          * TODO: this conversion is not complete, update it
 357                          * after adding UAC3 values to asound.h
 358                          */
 359                         switch (is->bChRelationship) {
 360                         case UAC3_CH_MONO:
 361                                 map = SNDRV_CHMAP_MONO;
 362                                 break;
 363                         case UAC3_CH_LEFT:
 364                         case UAC3_CH_FRONT_LEFT:
 365                         case UAC3_CH_HEADPHONE_LEFT:
 366                                 map = SNDRV_CHMAP_FL;
 367                                 break;
 368                         case UAC3_CH_RIGHT:
 369                         case UAC3_CH_FRONT_RIGHT:
 370                         case UAC3_CH_HEADPHONE_RIGHT:
 371                                 map = SNDRV_CHMAP_FR;
 372                                 break;
 373                         case UAC3_CH_FRONT_CENTER:
 374                                 map = SNDRV_CHMAP_FC;
 375                                 break;
 376                         case UAC3_CH_FRONT_LEFT_OF_CENTER:
 377                                 map = SNDRV_CHMAP_FLC;
 378                                 break;
 379                         case UAC3_CH_FRONT_RIGHT_OF_CENTER:
 380                                 map = SNDRV_CHMAP_FRC;
 381                                 break;
 382                         case UAC3_CH_SIDE_LEFT:
 383                                 map = SNDRV_CHMAP_SL;
 384                                 break;
 385                         case UAC3_CH_SIDE_RIGHT:
 386                                 map = SNDRV_CHMAP_SR;
 387                                 break;
 388                         case UAC3_CH_BACK_LEFT:
 389                                 map = SNDRV_CHMAP_RL;
 390                                 break;
 391                         case UAC3_CH_BACK_RIGHT:
 392                                 map = SNDRV_CHMAP_RR;
 393                                 break;
 394                         case UAC3_CH_BACK_CENTER:
 395                                 map = SNDRV_CHMAP_RC;
 396                                 break;
 397                         case UAC3_CH_BACK_LEFT_OF_CENTER:
 398                                 map = SNDRV_CHMAP_RLC;
 399                                 break;
 400                         case UAC3_CH_BACK_RIGHT_OF_CENTER:
 401                                 map = SNDRV_CHMAP_RRC;
 402                                 break;
 403                         case UAC3_CH_TOP_CENTER:
 404                                 map = SNDRV_CHMAP_TC;
 405                                 break;
 406                         case UAC3_CH_TOP_FRONT_LEFT:
 407                                 map = SNDRV_CHMAP_TFL;
 408                                 break;
 409                         case UAC3_CH_TOP_FRONT_RIGHT:
 410                                 map = SNDRV_CHMAP_TFR;
 411                                 break;
 412                         case UAC3_CH_TOP_FRONT_CENTER:
 413                                 map = SNDRV_CHMAP_TFC;
 414                                 break;
 415                         case UAC3_CH_TOP_FRONT_LOC:
 416                                 map = SNDRV_CHMAP_TFLC;
 417                                 break;
 418                         case UAC3_CH_TOP_FRONT_ROC:
 419                                 map = SNDRV_CHMAP_TFRC;
 420                                 break;
 421                         case UAC3_CH_TOP_SIDE_LEFT:
 422                                 map = SNDRV_CHMAP_TSL;
 423                                 break;
 424                         case UAC3_CH_TOP_SIDE_RIGHT:
 425                                 map = SNDRV_CHMAP_TSR;
 426                                 break;
 427                         case UAC3_CH_TOP_BACK_LEFT:
 428                                 map = SNDRV_CHMAP_TRL;
 429                                 break;
 430                         case UAC3_CH_TOP_BACK_RIGHT:
 431                                 map = SNDRV_CHMAP_TRR;
 432                                 break;
 433                         case UAC3_CH_TOP_BACK_CENTER:
 434                                 map = SNDRV_CHMAP_TRC;
 435                                 break;
 436                         case UAC3_CH_BOTTOM_CENTER:
 437                                 map = SNDRV_CHMAP_BC;
 438                                 break;
 439                         case UAC3_CH_LOW_FREQUENCY_EFFECTS:
 440                                 map = SNDRV_CHMAP_LFE;
 441                                 break;
 442                         case UAC3_CH_LFE_LEFT:
 443                                 map = SNDRV_CHMAP_LLFE;
 444                                 break;
 445                         case UAC3_CH_LFE_RIGHT:
 446                                 map = SNDRV_CHMAP_RLFE;
 447                                 break;
 448                         case UAC3_CH_RELATIONSHIP_UNDEFINED:
 449                         default:
 450                                 map = SNDRV_CHMAP_UNKNOWN;
 451                                 break;
 452                         }
 453                         chmap->map[c++] = map;
 454                 }
 455                 p += cs_len;
 456         }
 457
 458         if (channels < c)
 459                 pr_err("%s: channel number mismatch\n", __func__);
 460
 461         chmap->channels = channels;
 462
 463         for (; c < channels; c++)
 464                 chmap->map[c] = SNDRV_CHMAP_UNKNOWN;
 465
 466         return chmap;
 467 }
 468
 469 /*
 470  * add this endpoint to the chip instance.
 471  * if a stream with the same endpoint already exists, append to it.
 472  * if not, create a new pcm stream. note, fp is added to the substream
 473  * fmt_list and will be freed on the chip instance release. do not free
 474  * fp or do remove it from the substream fmt_list to avoid double-free.
 475  */
 476 static int __snd_usb_add_audio_stream(struct snd_usb_audio *chip,
 477                                       int stream,
 478                                       struct audioformat *fp,
 479                                       struct snd_usb_power_domain *pd)
 480
 481 {
 482         struct snd_usb_stream *as;
 483         struct snd_usb_substream *subs;
 484         struct snd_pcm *pcm;
 485         int err;
 486
 487         list_for_each_entry(as, &chip->pcm_list, list) {
 488                 if (as->fmt_type != fp->fmt_type)
 489                         continue;
 490                 subs = &as->substream[stream];
 491                 if (subs->ep_num == fp->endpoint) {
 492                         list_add_tail(&fp->list, &subs->fmt_list);
 493                         subs->num_formats++;
 494                         subs->formats |= fp->formats;
 495                         return 0;
 496                 }
 497         }
 498         /* look for an empty stream */
 499         list_for_each_entry(as, &chip->pcm_list, list) {
 500                 if (as->fmt_type != fp->fmt_type)
 501                         continue;
 502                 subs = &as->substream[stream];
 503                 if (subs->ep_num)
 504                         continue;
 505                 if (snd_device_get_state(chip->card, as->pcm) !=
 506                     SNDRV_DEV_BUILD)
 507                         chip->need_delayed_register = true;
 508                 err = snd_pcm_new_stream(as->pcm, stream, 1);
 509                 if (err < 0)
 510                         return err;
 511                 snd_usb_init_substream(as, stream, fp, pd);
 512                 return add_chmap(as->pcm, stream, subs);
 513         }
 514
 515         /* create a new pcm */
 516         as = kzalloc(sizeof(*as), GFP_KERNEL);
 517         if (!as)
 518                 return -ENOMEM;
 519         as->pcm_index = chip->pcm_devs;
 520         as->chip = chip;
 521         as->fmt_type = fp->fmt_type;
 522         err = snd_pcm_new(chip->card, "USB Audio", chip->pcm_devs,
 523                           stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0,
 524                           stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1,
 525                           &pcm);
 526         if (err < 0) {
 527                 kfree(as);
 528                 return err;
 529         }
 530         as->pcm = pcm;
 531         pcm->private_data = as;
 532         pcm->private_free = snd_usb_audio_pcm_free;
 533         pcm->info_flags = 0;
 534         if (chip->pcm_devs > 0)
 535                 sprintf(pcm->name, "USB Audio #%d", chip->pcm_devs);
 536         else
 537                 strcpy(pcm->name, "USB Audio");
 538
 539         snd_usb_init_substream(as, stream, fp, pd);
 540
 541         /*
 542          * Keep using head insertion for M-Audio Audiophile USB (tm) which has a
 543          * fix to swap capture stream order in conf/cards/USB-audio.conf
 544          */
 545         if (chip->usb_id == USB_ID(0x0763, 0x2003))
 546                 list_add(&as->list, &chip->pcm_list);
 547         else
 548                 list_add_tail(&as->list, &chip->pcm_list);
 549
 550         chip->pcm_devs++;
 551
 552         snd_usb_proc_pcm_format_add(as);
 553
 554         return add_chmap(pcm, stream, &as->substream[stream]);
 555 }
 556
 557 int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
 558                              int stream,
 559                              struct audioformat *fp)
 560 {
 561         return __snd_usb_add_audio_stream(chip, stream, fp, NULL);
 562 }
 563
 564 static int snd_usb_add_audio_stream_v3(struct snd_usb_audio *chip,
 565                                        int stream,
 566                                        struct audioformat *fp,
 567                                        struct snd_usb_power_domain *pd)
 568 {
 569         return __snd_usb_add_audio_stream(chip, stream, fp, pd);
 570 }
 571
 572 static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
 573                                          struct usb_host_interface *alts,
 574                                          int protocol, int iface_no)
 575 {
 576         /* parsed with a v1 header here. that's ok as we only look at the
 577          * header first which is the same for both versions */
 578         struct uac_iso_endpoint_descriptor *csep;
 579         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
 580         int attributes = 0;
 581
 582         csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
 583
 584         /* Creamware Noah has this descriptor after the 2nd endpoint */
 585         if (!csep && altsd->bNumEndpoints >= 2)
 586                 csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
 587
 588         /*
 589          * If we can't locate the USB_DT_CS_ENDPOINT descriptor in the extra
 590          * bytes after the first endpoint, go search the entire interface.
 591          * Some devices have it directly *before* the standard endpoint.
 592          */
 593         if (!csep)
 594                 csep = snd_usb_find_desc(alts->extra, alts->extralen, NULL, USB_DT_CS_ENDPOINT);
 595
 596         if (!csep || csep->bLength < 7 ||
 597             csep->bDescriptorSubtype != UAC_EP_GENERAL)
 598                 goto error;
 599
 600         if (protocol == UAC_VERSION_1) {
 601                 attributes = csep->bmAttributes;
 602         } else if (protocol == UAC_VERSION_2) {
 603                 struct uac2_iso_endpoint_descriptor *csep2 =
 604                         (struct uac2_iso_endpoint_descriptor *) csep;
 605
 606                 if (csep2->bLength < sizeof(*csep2))
 607                         goto error;
 608                 attributes = csep->bmAttributes & UAC_EP_CS_ATTR_FILL_MAX;
 609
 610                 /* emulate the endpoint attributes of a v1 device */
 611                 if (csep2->bmControls & UAC2_CONTROL_PITCH)
 612                         attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
 613         } else { /* UAC_VERSION_3 */
 614                 struct uac3_iso_endpoint_descriptor *csep3 =
 615                         (struct uac3_iso_endpoint_descriptor *) csep;
 616
 617                 if (csep3->bLength < sizeof(*csep3))
 618                         goto error;
 619                 /* emulate the endpoint attributes of a v1 device */
 620                 if (le32_to_cpu(csep3->bmControls) & UAC2_CONTROL_PITCH)
 621                         attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
 622         }
 623
 624         return attributes;
 625
 626  error:
 627         usb_audio_warn(chip,
 628                        "%u:%d : no or invalid class specific endpoint descriptor\n",
 629                        iface_no, altsd->bAlternateSetting);
 630         return 0;
 631 }
 632
 633 /* find an input terminal descriptor (either UAC1 or UAC2) with the given
 634  * terminal id
 635  */
 636 static void *
 637 snd_usb_find_input_terminal_descriptor(struct usb_host_interface *ctrl_iface,
 638                                        int terminal_id, int protocol)
 639 {
 640         struct uac2_input_terminal_descriptor *term = NULL;
 641
 642         while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
 643                                                ctrl_iface->extralen,
 644                                                term, UAC_INPUT_TERMINAL))) {
 645                 if (!snd_usb_validate_audio_desc(term, protocol))
 646                         continue;
 647                 if (term->bTerminalID == terminal_id)
 648                         return term;
 649         }
 650
 651         return NULL;
 652 }
 653
 654 static void *
 655 snd_usb_find_output_terminal_descriptor(struct usb_host_interface *ctrl_iface,
 656                                         int terminal_id, int protocol)
 657 {
 658         /* OK to use with both UAC2 and UAC3 */
 659         struct uac2_output_terminal_descriptor *term = NULL;
 660
 661         while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
 662                                                ctrl_iface->extralen,
 663                                                term, UAC_OUTPUT_TERMINAL))) {
 664                 if (!snd_usb_validate_audio_desc(term, protocol))
 665                         continue;
 666                 if (term->bTerminalID == terminal_id)
 667                         return term;
 668         }
 669
 670         return NULL;
 671 }
 672
 673 static struct audioformat *
 674 audio_format_alloc_init(struct snd_usb_audio *chip,
 675                        struct usb_host_interface *alts,
 676                        int protocol, int iface_no, int altset_idx,
 677                        int altno, int num_channels, int clock)
 678 {
 679         struct audioformat *fp;
 680
 681         fp = kzalloc(sizeof(*fp), GFP_KERNEL);
 682         if (!fp)
 683                 return NULL;
 684
 685         fp->iface = iface_no;
 686         fp->altsetting = altno;
 687         fp->altset_idx = altset_idx;
 688         fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
 689         fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
 690         fp->datainterval = snd_usb_parse_datainterval(chip, alts);
 691         fp->protocol = protocol;
 692         fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
 693         fp->channels = num_channels;
 694         if (snd_usb_get_speed(chip->dev) == USB_SPEED_HIGH)
 695                 fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
 696                                 * (fp->maxpacksize & 0x7ff);
 697         fp->clock = clock;
 698         INIT_LIST_HEAD(&fp->list);
 699
 700         return fp;
 701 }
 702
 703 static struct audioformat *
 704 snd_usb_get_audioformat_uac12(struct snd_usb_audio *chip,
 705                               struct usb_host_interface *alts,
 706                               int protocol, int iface_no, int altset_idx,
 707                               int altno, int stream, int bm_quirk)
 708 {
 709         struct usb_device *dev = chip->dev;
 710         struct uac_format_type_i_continuous_descriptor *fmt;
 711         unsigned int num_channels = 0, chconfig = 0;
 712         struct audioformat *fp;
 713         int clock = 0;
 714         u64 format;
 715
 716         /* get audio formats */
 717         if (protocol == UAC_VERSION_1) {
 718                 struct uac1_as_header_descriptor *as =
 719                         snd_usb_find_csint_desc(alts->extra, alts->extralen,
 720                                                 NULL, UAC_AS_GENERAL);
 721                 struct uac_input_terminal_descriptor *iterm;
 722
 723                 if (!as) {
 724                         dev_err(&dev->dev,
 725                                 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
 726                                 iface_no, altno);
 727                         return NULL;
 728                 }
 729
 730                 if (as->bLength < sizeof(*as)) {
 731                         dev_err(&dev->dev,
 732                                 "%u:%d : invalid UAC_AS_GENERAL desc\n",
 733                                 iface_no, altno);
 734                         return NULL;
 735                 }
 736
 737                 format = le16_to_cpu(as->wFormatTag); /* remember the format value */
 738
 739                 iterm = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
 740                                                                as->bTerminalLink,
 741                                                                protocol);
 742                 if (iterm) {
 743                         num_channels = iterm->bNrChannels;
 744                         chconfig = le16_to_cpu(iterm->wChannelConfig);
 745                 }
 746         } else { /* UAC_VERSION_2 */
 747                 struct uac2_input_terminal_descriptor *input_term;
 748                 struct uac2_output_terminal_descriptor *output_term;
 749                 struct uac2_as_header_descriptor *as =
 750                         snd_usb_find_csint_desc(alts->extra, alts->extralen,
 751                                                 NULL, UAC_AS_GENERAL);
 752
 753                 if (!as) {
 754                         dev_err(&dev->dev,
 755                                 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
 756                                 iface_no, altno);
 757                         return NULL;
 758                 }
 759
 760                 if (as->bLength < sizeof(*as)) {
 761                         dev_err(&dev->dev,
 762                                 "%u:%d : invalid UAC_AS_GENERAL desc\n",
 763                                 iface_no, altno);
 764                         return NULL;
 765                 }
 766
 767                 num_channels = as->bNrChannels;
 768                 format = le32_to_cpu(as->bmFormats);
 769                 chconfig = le32_to_cpu(as->bmChannelConfig);
 770
 771                 /*
 772                  * lookup the terminal associated to this interface
 773                  * to extract the clock
 774                  */
 775                 input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
 776                                                                     as->bTerminalLink,
 777                                                                     protocol);
 778                 if (input_term) {
 779                         clock = input_term->bCSourceID;
 780                         if (!chconfig && (num_channels == input_term->bNrChannels))
 781                                 chconfig = le32_to_cpu(input_term->bmChannelConfig);
 782                         goto found_clock;
 783                 }
 784
 785                 output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
 786                                                                       as->bTerminalLink,
 787                                                                       protocol);
 788                 if (output_term) {
 789                         clock = output_term->bCSourceID;
 790                         goto found_clock;
 791                 }
 792
 793                 dev_err(&dev->dev,
 794                         "%u:%d : bogus bTerminalLink %d\n",
 795                         iface_no, altno, as->bTerminalLink);
 796                 return NULL;
 797         }
 798
 799 found_clock:
 800         /* get format type */
 801         fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen,
 802                                       NULL, UAC_FORMAT_TYPE);
 803         if (!fmt) {
 804                 dev_err(&dev->dev,
 805                         "%u:%d : no UAC_FORMAT_TYPE desc\n",
 806                         iface_no, altno);
 807                 return NULL;
 808         }
 809         if (((protocol == UAC_VERSION_1) && (fmt->bLength < 8))
 810                         || ((protocol == UAC_VERSION_2) &&
 811                                         (fmt->bLength < 6))) {
 812                 dev_err(&dev->dev,
 813                         "%u:%d : invalid UAC_FORMAT_TYPE desc\n",
 814                         iface_no, altno);
 815                 return NULL;
 816         }
 817
 818         /*
 819          * Blue Microphones workaround: The last altsetting is
 820          * identical with the previous one, except for a larger
 821          * packet size, but is actually a mislabeled two-channel
 822          * setting; ignore it.
 823          *
 824          * Part 2: analyze quirk flag and format
 825          */
 826         if (bm_quirk && fmt->bNrChannels == 1 && fmt->bSubframeSize == 2)
 827                 return NULL;
 828
 829         fp = audio_format_alloc_init(chip, alts, protocol, iface_no,
 830                                      altset_idx, altno, num_channels, clock);
 831         if (!fp)
 832                 return ERR_PTR(-ENOMEM);
 833
 834         fp->attributes = parse_uac_endpoint_attributes(chip, alts, protocol,
 835                                                        iface_no);
 836
 837         /* some quirks for attributes here */
 838         snd_usb_audioformat_attributes_quirk(chip, fp, stream);
 839
 840         /* ok, let's parse further... */
 841         if (snd_usb_parse_audio_format(chip, fp, format,
 842                                         fmt, stream) < 0) {
 843                 audioformat_free(fp);
 844                 return NULL;
 845         }
 846
 847         /* Create chmap */
 848         if (fp->channels != num_channels)
 849                 chconfig = 0;
 850
 851         fp->chmap = convert_chmap(fp->channels, chconfig, protocol);
 852
 853         return fp;
 854 }
 855
 856 static struct audioformat *
 857 snd_usb_get_audioformat_uac3(struct snd_usb_audio *chip,
 858                              struct usb_host_interface *alts,
 859                              struct snd_usb_power_domain **pd_out,
 860                              int iface_no, int altset_idx,
 861                              int altno, int stream)
 862 {
 863         struct usb_device *dev = chip->dev;
 864         struct uac3_input_terminal_descriptor *input_term;
 865         struct uac3_output_terminal_descriptor *output_term;
 866         struct uac3_cluster_header_descriptor *cluster;
 867         struct uac3_as_header_descriptor *as = NULL;
 868         struct uac3_hc_descriptor_header hc_header;
 869         struct snd_pcm_chmap_elem *chmap;
 870         struct snd_usb_power_domain *pd;
 871         unsigned char badd_profile;
 872         u64 badd_formats = 0;
 873         unsigned int num_channels;
 874         struct audioformat *fp;
 875         u16 cluster_id, wLength;
 876         int clock = 0;
 877         int err;
 878
 879         badd_profile = chip->badd_profile;
 880
 881         if (badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
 882                 unsigned int maxpacksize =
 883                         le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
 884
 885                 switch (maxpacksize) {
 886                 default:
 887                         dev_err(&dev->dev,
 888                                 "%u:%d : incorrect wMaxPacketSize for BADD profile\n",
 889                                 iface_no, altno);
 890                         return NULL;
 891                 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_16:
 892                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_16:
 893                         badd_formats = SNDRV_PCM_FMTBIT_S16_LE;
 894                         num_channels = 1;
 895                         break;
 896                 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_24:
 897                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_24:
 898                         badd_formats = SNDRV_PCM_FMTBIT_S24_3LE;
 899                         num_channels = 1;
 900                         break;
 901                 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_16:
 902                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_16:
 903                         badd_formats = SNDRV_PCM_FMTBIT_S16_LE;
 904                         num_channels = 2;
 905                         break;
 906                 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_24:
 907                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_24:
 908                         badd_formats = SNDRV_PCM_FMTBIT_S24_3LE;
 909                         num_channels = 2;
 910                         break;
 911                 }
 912
 913                 chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
 914                 if (!chmap)
 915                         return ERR_PTR(-ENOMEM);
 916
 917                 if (num_channels == 1) {
 918                         chmap->map[0] = SNDRV_CHMAP_MONO;
 919                 } else {
 920                         chmap->map[0] = SNDRV_CHMAP_FL;
 921                         chmap->map[1] = SNDRV_CHMAP_FR;
 922                 }
 923
 924                 chmap->channels = num_channels;
 925                 clock = UAC3_BADD_CS_ID9;
 926                 goto found_clock;
 927         }
 928
 929         as = snd_usb_find_csint_desc(alts->extra, alts->extralen,
 930                                      NULL, UAC_AS_GENERAL);
 931         if (!as) {
 932                 dev_err(&dev->dev,
 933                         "%u:%d : UAC_AS_GENERAL descriptor not found\n",
 934                         iface_no, altno);
 935                 return NULL;
 936         }
 937
 938         if (as->bLength < sizeof(*as)) {
 939                 dev_err(&dev->dev,
 940                         "%u:%d : invalid UAC_AS_GENERAL desc\n",
 941                         iface_no, altno);
 942                 return NULL;
 943         }
 944
 945         cluster_id = le16_to_cpu(as->wClusterDescrID);
 946         if (!cluster_id) {
 947                 dev_err(&dev->dev,
 948                         "%u:%d : no cluster descriptor\n",
 949                         iface_no, altno);
 950                 return NULL;
 951         }
 952
 953         /*
 954          * Get number of channels and channel map through
 955          * High Capability Cluster Descriptor
 956          *
 957          * First step: get High Capability header and
 958          * read size of Cluster Descriptor
 959          */
 960         err = snd_usb_ctl_msg(chip->dev,
 961                         usb_rcvctrlpipe(chip->dev, 0),
 962                         UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
 963                         USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 964                         cluster_id,
 965                         snd_usb_ctrl_intf(chip),
 966                         &hc_header, sizeof(hc_header));
 967         if (err < 0)
 968                 return ERR_PTR(err);
 969         else if (err != sizeof(hc_header)) {
 970                 dev_err(&dev->dev,
 971                         "%u:%d : can't get High Capability descriptor\n",
 972                         iface_no, altno);
 973                 return ERR_PTR(-EIO);
 974         }
 975
 976         /*
 977          * Second step: allocate needed amount of memory
 978          * and request Cluster Descriptor
 979          */
 980         wLength = le16_to_cpu(hc_header.wLength);
 981         cluster = kzalloc(wLength, GFP_KERNEL);
 982         if (!cluster)
 983                 return ERR_PTR(-ENOMEM);
 984         err = snd_usb_ctl_msg(chip->dev,
 985                         usb_rcvctrlpipe(chip->dev, 0),
 986                         UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
 987                         USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 988                         cluster_id,
 989                         snd_usb_ctrl_intf(chip),
 990                         cluster, wLength);
 991         if (err < 0) {
 992                 kfree(cluster);
 993                 return ERR_PTR(err);
 994         } else if (err != wLength) {
 995                 dev_err(&dev->dev,
 996                         "%u:%d : can't get Cluster Descriptor\n",
 997                         iface_no, altno);
 998                 kfree(cluster);
 999                 return ERR_PTR(-EIO);
1000         }
1001
1002         num_channels = cluster->bNrChannels;
1003         chmap = convert_chmap_v3(cluster);
1004         kfree(cluster);
1005
1006         /*
1007          * lookup the terminal associated to this interface
1008          * to extract the clock
1009          */
1010         input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
1011                                                             as->bTerminalLink,
1012                                                             UAC_VERSION_3);
1013         if (input_term) {
1014                 clock = input_term->bCSourceID;
1015                 goto found_clock;
1016         }
1017
1018         output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
1019                                                               as->bTerminalLink,
1020                                                               UAC_VERSION_3);
1021         if (output_term) {
1022                 clock = output_term->bCSourceID;
1023                 goto found_clock;
1024         }
1025
1026         dev_err(&dev->dev, "%u:%d : bogus bTerminalLink %d\n",
1027                         iface_no, altno, as->bTerminalLink);
1028         kfree(chmap);
1029         return NULL;
1030
1031 found_clock:
1032         fp = audio_format_alloc_init(chip, alts, UAC_VERSION_3, iface_no,
1033                                      altset_idx, altno, num_channels, clock);
1034         if (!fp) {
1035                 kfree(chmap);
1036                 return ERR_PTR(-ENOMEM);
1037         }
1038
1039         fp->chmap = chmap;
1040
1041         if (badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
1042                 fp->attributes = 0; /* No attributes */
1043
1044                 fp->fmt_type = UAC_FORMAT_TYPE_I;
1045                 fp->formats = badd_formats;
1046
1047                 fp->nr_rates = 0;       /* SNDRV_PCM_RATE_CONTINUOUS */
1048                 fp->rate_min = UAC3_BADD_SAMPLING_RATE;
1049                 fp->rate_max = UAC3_BADD_SAMPLING_RATE;
1050                 fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
1051
1052                 pd = kzalloc(sizeof(*pd), GFP_KERNEL);
1053                 if (!pd) {
1054                         audioformat_free(fp);
1055                         return NULL;
1056                 }
1057                 pd->pd_id = (stream == SNDRV_PCM_STREAM_PLAYBACK) ?
1058                                         UAC3_BADD_PD_ID10 : UAC3_BADD_PD_ID11;
1059                 pd->pd_d1d0_rec = UAC3_BADD_PD_RECOVER_D1D0;
1060                 pd->pd_d2d0_rec = UAC3_BADD_PD_RECOVER_D2D0;
1061
1062         } else {
1063                 fp->attributes = parse_uac_endpoint_attributes(chip, alts,
1064                                                                UAC_VERSION_3,
1065                                                                iface_no);
1066
1067                 pd = snd_usb_find_power_domain(chip->ctrl_intf,
1068                                                as->bTerminalLink);
1069
1070                 /* ok, let's parse further... */
1071                 if (snd_usb_parse_audio_format_v3(chip, fp, as, stream) < 0) {
1072                         kfree(pd);
1073                         audioformat_free(fp);
1074                         return NULL;
1075                 }
1076         }
1077
1078         if (pd)
1079                 *pd_out = pd;
1080
1081         return fp;
1082 }
1083
1084 static int __snd_usb_parse_audio_interface(struct snd_usb_audio *chip,
1085                                            int iface_no,
1086                                            bool *has_non_pcm, bool non_pcm)
1087 {
1088         struct usb_device *dev;
1089         struct usb_interface *iface;
1090         struct usb_host_interface *alts;
1091         struct usb_interface_descriptor *altsd;
1092         int i, altno, err, stream;
1093         struct audioformat *fp = NULL;
1094         struct snd_usb_power_domain *pd = NULL;
1095         int num, protocol;
1096
1097         dev = chip->dev;
1098
1099         /* parse the interface's altsettings */
1100         iface = usb_ifnum_to_if(dev, iface_no);
1101
1102         num = iface->num_altsetting;
1103
1104         /*
1105          * Dallas DS4201 workaround: It presents 5 altsettings, but the last
1106          * one misses syncpipe, and does not produce any sound.
1107          */
1108         if (chip->usb_id == USB_ID(0x04fa, 0x4201))
1109                 num = 4;
1110
1111         for (i = 0; i < num; i++) {
1112                 alts = &iface->altsetting[i];
1113                 altsd = get_iface_desc(alts);
1114                 protocol = altsd->bInterfaceProtocol;
1115                 /* skip invalid one */
1116                 if (((altsd->bInterfaceClass != USB_CLASS_AUDIO ||
1117                       (altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING &&
1118                        altsd->bInterfaceSubClass != USB_SUBCLASS_VENDOR_SPEC)) &&
1119                      altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
1120                     altsd->bNumEndpoints < 1 ||
1121                     le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) == 0)
1122                         continue;
1123                 /* must be isochronous */
1124                 if ((get_endpoint(alts, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
1125                     USB_ENDPOINT_XFER_ISOC)
1126                         continue;
1127                 /* check direction */
1128                 stream = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN) ?
1129                         SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
1130                 altno = altsd->bAlternateSetting;
1131
1132                 if (snd_usb_apply_interface_quirk(chip, iface_no, altno))
1133                         continue;
1134
1135                 /*
1136                  * Roland audio streaming interfaces are marked with protocols
1137                  * 0/1/2, but are UAC 1 compatible.
1138                  */
1139                 if (USB_ID_VENDOR(chip->usb_id) == 0x0582 &&
1140                     altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
1141                     protocol <= 2)
1142                         protocol = UAC_VERSION_1;
1143
1144                 switch (protocol) {
1145                 default:
1146                         dev_dbg(&dev->dev, "%u:%d: unknown interface protocol %#02x, assuming v1\n",
1147                                 iface_no, altno, protocol);
1148                         protocol = UAC_VERSION_1;
1149                         fallthrough;
1150                 case UAC_VERSION_1:
1151                 case UAC_VERSION_2: {
1152                         int bm_quirk = 0;
1153
1154                         /*
1155                          * Blue Microphones workaround: The last altsetting is
1156                          * identical with the previous one, except for a larger
1157                          * packet size, but is actually a mislabeled two-channel
1158                          * setting; ignore it.
1159                          *
1160                          * Part 1: prepare quirk flag
1161                          */
1162                         if (altno == 2 && num == 3 &&
1163                             fp && fp->altsetting == 1 && fp->channels == 1 &&
1164                             fp->formats == SNDRV_PCM_FMTBIT_S16_LE &&
1165                             protocol == UAC_VERSION_1 &&
1166                             le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) ==
1167                                                         fp->maxpacksize * 2)
1168                                 bm_quirk = 1;
1169
1170                         fp = snd_usb_get_audioformat_uac12(chip, alts, protocol,
1171                                                            iface_no, i, altno,
1172                                                            stream, bm_quirk);
1173                         break;
1174                 }
1175                 case UAC_VERSION_3:
1176                         fp = snd_usb_get_audioformat_uac3(chip, alts, &pd,
1177                                                 iface_no, i, altno, stream);
1178                         break;
1179                 }
1180
1181                 if (!fp)
1182                         continue;
1183                 else if (IS_ERR(fp))
1184                         return PTR_ERR(fp);
1185
1186                 if (fp->fmt_type != UAC_FORMAT_TYPE_I)
1187                         *has_non_pcm = true;
1188                 if ((fp->fmt_type == UAC_FORMAT_TYPE_I) == non_pcm) {
1189                         audioformat_free(fp);
1190                         kfree(pd);
1191                         fp = NULL;
1192                         pd = NULL;
1193                         continue;
1194                 }
1195
1196                 snd_usb_audioformat_set_sync_ep(chip, fp);
1197
1198                 dev_dbg(&dev->dev, "%u:%d: add audio endpoint %#x\n", iface_no, altno, fp->endpoint);
1199                 if (protocol == UAC_VERSION_3)
1200                         err = snd_usb_add_audio_stream_v3(chip, stream, fp, pd);
1201                 else
1202                         err = snd_usb_add_audio_stream(chip, stream, fp);
1203
1204                 if (err < 0) {
1205                         audioformat_free(fp);
1206                         kfree(pd);
1207                         return err;
1208                 }
1209
1210                 /* add endpoints */
1211                 err = snd_usb_add_endpoint(chip, fp->endpoint,
1212                                            SND_USB_ENDPOINT_TYPE_DATA);
1213                 if (err < 0)
1214                         return err;
1215
1216                 if (fp->sync_ep) {
1217                         err = snd_usb_add_endpoint(chip, fp->sync_ep,
1218                                                    fp->implicit_fb ?
1219                                                    SND_USB_ENDPOINT_TYPE_DATA :
1220                                                    SND_USB_ENDPOINT_TYPE_SYNC);
1221                         if (err < 0)
1222                                 return err;
1223                 }
1224
1225                 /* try to set the interface... */
1226                 usb_set_interface(chip->dev, iface_no, 0);
1227                 snd_usb_init_pitch(chip, fp);
1228                 snd_usb_init_sample_rate(chip, fp, fp->rate_max);
1229                 usb_set_interface(chip->dev, iface_no, altno);
1230         }
1231         return 0;
1232 }
1233
1234 int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no)
1235 {
1236         int err;
1237         bool has_non_pcm = false;
1238
1239         /* parse PCM formats */
1240         err = __snd_usb_parse_audio_interface(chip, iface_no, &has_non_pcm, false);
1241         if (err < 0)
1242                 return err;
1243
1244         if (has_non_pcm) {
1245                 /* parse non-PCM formats */
1246                 err = __snd_usb_parse_audio_interface(chip, iface_no, &has_non_pcm, true);
1247                 if (err < 0)
1248                         return err;
1249         }
1250
1251         return 0;
1252 }
1253