sound/usb/stream.c

   1 /*
   2  *   This program is free software; you can redistribute it and/or modify
   3  *   it under the terms of the GNU General Public License as published by
   4  *   the Free Software Foundation; either version 2 of the License, or
   5  *   (at your option) any later version.
   6  *
   7  *   This program is distributed in the hope that it will be useful,
   8  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  *   GNU General Public License for more details.
  11  *
  12  *   You should have received a copy of the GNU General Public License
  13  *   along with this program; if not, write to the Free Software
  14  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  15  */
  16
  17
  18 #include <linux/init.h>
  19 #include <linux/slab.h>
  20 #include <linux/usb.h>
  21 #include <linux/usb/audio.h>
  22 #include <linux/usb/audio-v2.h>
  23 #include <linux/usb/audio-v3.h>
  24
  25 #include <sound/core.h>
  26 #include <sound/pcm.h>
  27 #include <sound/control.h>
  28 #include <sound/tlv.h>
  29
  30 #include "usbaudio.h"
  31 #include "card.h"
  32 #include "proc.h"
  33 #include "quirks.h"
  34 #include "endpoint.h"
  35 #include "pcm.h"
  36 #include "helper.h"
  37 #include "format.h"
  38 #include "clock.h"
  39 #include "stream.h"
  40 #include "power.h"
  41 #include "media.h"
  42
  43 /*
  44  * free a substream
  45  */
  46 static void free_substream(struct snd_usb_substream *subs)
  47 {
  48         struct audioformat *fp, *n;
  49
  50         if (!subs->num_formats)
  51                 return; /* not initialized */
  52         list_for_each_entry_safe(fp, n, &subs->fmt_list, list) {
  53                 kfree(fp->rate_table);
  54                 kfree(fp->chmap);
  55                 kfree(fp);
  56         }
  57         kfree(subs->rate_list.list);
  58         kfree(subs->str_pd);
  59         snd_media_stream_delete(subs);
  60 }
  61
  62
  63 /*
  64  * free a usb stream instance
  65  */
  66 static void snd_usb_audio_stream_free(struct snd_usb_stream *stream)
  67 {
  68         free_substream(&stream->substream[0]);
  69         free_substream(&stream->substream[1]);
  70         list_del(&stream->list);
  71         kfree(stream);
  72 }
  73
  74 static void snd_usb_audio_pcm_free(struct snd_pcm *pcm)
  75 {
  76         struct snd_usb_stream *stream = pcm->private_data;
  77         if (stream) {
  78                 stream->pcm = NULL;
  79                 snd_usb_audio_stream_free(stream);
  80         }
  81 }
  82
  83 /*
  84  * initialize the substream instance.
  85  */
  86
  87 static void snd_usb_init_substream(struct snd_usb_stream *as,
  88                                    int stream,
  89                                    struct audioformat *fp,
  90                                    struct snd_usb_power_domain *pd)
  91 {
  92         struct snd_usb_substream *subs = &as->substream[stream];
  93
  94         INIT_LIST_HEAD(&subs->fmt_list);
  95         spin_lock_init(&subs->lock);
  96
  97         subs->stream = as;
  98         subs->direction = stream;
  99         subs->dev = as->chip->dev;
 100         subs->txfr_quirk = as->chip->txfr_quirk;
 101         subs->tx_length_quirk = as->chip->tx_length_quirk;
 102         subs->speed = snd_usb_get_speed(subs->dev);
 103         subs->pkt_offset_adj = 0;
 104
 105         snd_usb_set_pcm_ops(as->pcm, stream);
 106
 107         list_add_tail(&fp->list, &subs->fmt_list);
 108         subs->formats |= fp->formats;
 109         subs->num_formats++;
 110         subs->fmt_type = fp->fmt_type;
 111         subs->ep_num = fp->endpoint;
 112         if (fp->channels > subs->channels_max)
 113                 subs->channels_max = fp->channels;
 114
 115         if (pd) {
 116                 subs->str_pd = pd;
 117                 /* Initialize Power Domain to idle status D1 */
 118                 snd_usb_power_domain_set(subs->stream->chip, pd,
 119                                          UAC3_PD_STATE_D1);
 120         }
 121
 122         snd_usb_preallocate_buffer(subs);
 123 }
 124
 125 /* kctl callbacks for usb-audio channel maps */
 126 static int usb_chmap_ctl_info(struct snd_kcontrol *kcontrol,
 127                               struct snd_ctl_elem_info *uinfo)
 128 {
 129         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
 130         struct snd_usb_substream *subs = info->private_data;
 131
 132         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 133         uinfo->count = subs->channels_max;
 134         uinfo->value.integer.min = 0;
 135         uinfo->value.integer.max = SNDRV_CHMAP_LAST;
 136         return 0;
 137 }
 138
 139 /* check whether a duplicated entry exists in the audiofmt list */
 140 static bool have_dup_chmap(struct snd_usb_substream *subs,
 141                            struct audioformat *fp)
 142 {
 143         struct audioformat *prev = fp;
 144
 145         list_for_each_entry_continue_reverse(prev, &subs->fmt_list, list) {
 146                 if (prev->chmap &&
 147                     !memcmp(prev->chmap, fp->chmap, sizeof(*fp->chmap)))
 148                         return true;
 149         }
 150         return false;
 151 }
 152
 153 static int usb_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
 154                              unsigned int size, unsigned int __user *tlv)
 155 {
 156         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
 157         struct snd_usb_substream *subs = info->private_data;
 158         struct audioformat *fp;
 159         unsigned int __user *dst;
 160         int count = 0;
 161
 162         if (size < 8)
 163                 return -ENOMEM;
 164         if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
 165                 return -EFAULT;
 166         size -= 8;
 167         dst = tlv + 2;
 168         list_for_each_entry(fp, &subs->fmt_list, list) {
 169                 int i, ch_bytes;
 170
 171                 if (!fp->chmap)
 172                         continue;
 173                 if (have_dup_chmap(subs, fp))
 174                         continue;
 175                 /* copy the entry */
 176                 ch_bytes = fp->chmap->channels * 4;
 177                 if (size < 8 + ch_bytes)
 178                         return -ENOMEM;
 179                 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
 180                     put_user(ch_bytes, dst + 1))
 181                         return -EFAULT;
 182                 dst += 2;
 183                 for (i = 0; i < fp->chmap->channels; i++, dst++) {
 184                         if (put_user(fp->chmap->map[i], dst))
 185                                 return -EFAULT;
 186                 }
 187
 188                 count += 8 + ch_bytes;
 189                 size -= 8 + ch_bytes;
 190         }
 191         if (put_user(count, tlv + 1))
 192                 return -EFAULT;
 193         return 0;
 194 }
 195
 196 static int usb_chmap_ctl_get(struct snd_kcontrol *kcontrol,
 197                              struct snd_ctl_elem_value *ucontrol)
 198 {
 199         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
 200         struct snd_usb_substream *subs = info->private_data;
 201         struct snd_pcm_chmap_elem *chmap = NULL;
 202         int i;
 203
 204         memset(ucontrol->value.integer.value, 0,
 205                sizeof(ucontrol->value.integer.value));
 206         if (subs->cur_audiofmt)
 207                 chmap = subs->cur_audiofmt->chmap;
 208         if (chmap) {
 209                 for (i = 0; i < chmap->channels; i++)
 210                         ucontrol->value.integer.value[i] = chmap->map[i];
 211         }
 212         return 0;
 213 }
 214
 215 /* create a chmap kctl assigned to the given USB substream */
 216 static int add_chmap(struct snd_pcm *pcm, int stream,
 217                      struct snd_usb_substream *subs)
 218 {
 219         struct audioformat *fp;
 220         struct snd_pcm_chmap *chmap;
 221         struct snd_kcontrol *kctl;
 222         int err;
 223
 224         list_for_each_entry(fp, &subs->fmt_list, list)
 225                 if (fp->chmap)
 226                         goto ok;
 227         /* no chmap is found */
 228         return 0;
 229
 230  ok:
 231         err = snd_pcm_add_chmap_ctls(pcm, stream, NULL, 0, 0, &chmap);
 232         if (err < 0)
 233                 return err;
 234
 235         /* override handlers */
 236         chmap->private_data = subs;
 237         kctl = chmap->kctl;
 238         kctl->info = usb_chmap_ctl_info;
 239         kctl->get = usb_chmap_ctl_get;
 240         kctl->tlv.c = usb_chmap_ctl_tlv;
 241
 242         return 0;
 243 }
 244
 245 /* convert from USB ChannelConfig bits to ALSA chmap element */
 246 static struct snd_pcm_chmap_elem *convert_chmap(int channels, unsigned int bits,
 247                                                 int protocol)
 248 {
 249         static unsigned int uac1_maps[] = {
 250                 SNDRV_CHMAP_FL,         /* left front */
 251                 SNDRV_CHMAP_FR,         /* right front */
 252                 SNDRV_CHMAP_FC,         /* center front */
 253                 SNDRV_CHMAP_LFE,        /* LFE */
 254                 SNDRV_CHMAP_SL,         /* left surround */
 255                 SNDRV_CHMAP_SR,         /* right surround */
 256                 SNDRV_CHMAP_FLC,        /* left of center */
 257                 SNDRV_CHMAP_FRC,        /* right of center */
 258                 SNDRV_CHMAP_RC,         /* surround */
 259                 SNDRV_CHMAP_SL,         /* side left */
 260                 SNDRV_CHMAP_SR,         /* side right */
 261                 SNDRV_CHMAP_TC,         /* top */
 262                 0 /* terminator */
 263         };
 264         static unsigned int uac2_maps[] = {
 265                 SNDRV_CHMAP_FL,         /* front left */
 266                 SNDRV_CHMAP_FR,         /* front right */
 267                 SNDRV_CHMAP_FC,         /* front center */
 268                 SNDRV_CHMAP_LFE,        /* LFE */
 269                 SNDRV_CHMAP_RL,         /* back left */
 270                 SNDRV_CHMAP_RR,         /* back right */
 271                 SNDRV_CHMAP_FLC,        /* front left of center */
 272                 SNDRV_CHMAP_FRC,        /* front right of center */
 273                 SNDRV_CHMAP_RC,         /* back center */
 274                 SNDRV_CHMAP_SL,         /* side left */
 275                 SNDRV_CHMAP_SR,         /* side right */
 276                 SNDRV_CHMAP_TC,         /* top center */
 277                 SNDRV_CHMAP_TFL,        /* top front left */
 278                 SNDRV_CHMAP_TFC,        /* top front center */
 279                 SNDRV_CHMAP_TFR,        /* top front right */
 280                 SNDRV_CHMAP_TRL,        /* top back left */
 281                 SNDRV_CHMAP_TRC,        /* top back center */
 282                 SNDRV_CHMAP_TRR,        /* top back right */
 283                 SNDRV_CHMAP_TFLC,       /* top front left of center */
 284                 SNDRV_CHMAP_TFRC,       /* top front right of center */
 285                 SNDRV_CHMAP_LLFE,       /* left LFE */
 286                 SNDRV_CHMAP_RLFE,       /* right LFE */
 287                 SNDRV_CHMAP_TSL,        /* top side left */
 288                 SNDRV_CHMAP_TSR,        /* top side right */
 289                 SNDRV_CHMAP_BC,         /* bottom center */
 290                 SNDRV_CHMAP_RLC,        /* back left of center */
 291                 SNDRV_CHMAP_RRC,        /* back right of center */
 292                 0 /* terminator */
 293         };
 294         struct snd_pcm_chmap_elem *chmap;
 295         const unsigned int *maps;
 296         int c;
 297
 298         if (channels > ARRAY_SIZE(chmap->map))
 299                 return NULL;
 300
 301         chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
 302         if (!chmap)
 303                 return NULL;
 304
 305         maps = protocol == UAC_VERSION_2 ? uac2_maps : uac1_maps;
 306         chmap->channels = channels;
 307         c = 0;
 308
 309         if (bits) {
 310                 for (; bits && *maps; maps++, bits >>= 1)
 311                         if (bits & 1)
 312                                 chmap->map[c++] = *maps;
 313         } else {
 314                 /* If we're missing wChannelConfig, then guess something
 315                     to make sure the channel map is not skipped entirely */
 316                 if (channels == 1)
 317                         chmap->map[c++] = SNDRV_CHMAP_MONO;
 318                 else
 319                         for (; c < channels && *maps; maps++)
 320                                 chmap->map[c++] = *maps;
 321         }
 322
 323         for (; c < channels; c++)
 324                 chmap->map[c] = SNDRV_CHMAP_UNKNOWN;
 325
 326         return chmap;
 327 }
 328
 329 /* UAC3 device stores channels information in Cluster Descriptors */
 330 static struct
 331 snd_pcm_chmap_elem *convert_chmap_v3(struct uac3_cluster_header_descriptor
 332                                                                 *cluster)
 333 {
 334         unsigned int channels = cluster->bNrChannels;
 335         struct snd_pcm_chmap_elem *chmap;
 336         void *p = cluster;
 337         int len, c;
 338
 339         if (channels > ARRAY_SIZE(chmap->map))
 340                 return NULL;
 341
 342         chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
 343         if (!chmap)
 344                 return NULL;
 345
 346         len = le16_to_cpu(cluster->wLength);
 347         c = 0;
 348         p += sizeof(struct uac3_cluster_header_descriptor);
 349
 350         while (((p - (void *)cluster) < len) && (c < channels)) {
 351                 struct uac3_cluster_segment_descriptor *cs_desc = p;
 352                 u16 cs_len;
 353                 u8 cs_type;
 354
 355                 cs_len = le16_to_cpu(cs_desc->wLength);
 356                 cs_type = cs_desc->bSegmentType;
 357
 358                 if (cs_type == UAC3_CHANNEL_INFORMATION) {
 359                         struct uac3_cluster_information_segment_descriptor *is = p;
 360                         unsigned char map;
 361
 362                         /*
 363                          * TODO: this conversion is not complete, update it
 364                          * after adding UAC3 values to asound.h
 365                          */
 366                         switch (is->bChRelationship) {
 367                         case UAC3_CH_MONO:
 368                                 map = SNDRV_CHMAP_MONO;
 369                                 break;
 370                         case UAC3_CH_LEFT:
 371                         case UAC3_CH_FRONT_LEFT:
 372                         case UAC3_CH_HEADPHONE_LEFT:
 373                                 map = SNDRV_CHMAP_FL;
 374                                 break;
 375                         case UAC3_CH_RIGHT:
 376                         case UAC3_CH_FRONT_RIGHT:
 377                         case UAC3_CH_HEADPHONE_RIGHT:
 378                                 map = SNDRV_CHMAP_FR;
 379                                 break;
 380                         case UAC3_CH_FRONT_CENTER:
 381                                 map = SNDRV_CHMAP_FC;
 382                                 break;
 383                         case UAC3_CH_FRONT_LEFT_OF_CENTER:
 384                                 map = SNDRV_CHMAP_FLC;
 385                                 break;
 386                         case UAC3_CH_FRONT_RIGHT_OF_CENTER:
 387                                 map = SNDRV_CHMAP_FRC;
 388                                 break;
 389                         case UAC3_CH_SIDE_LEFT:
 390                                 map = SNDRV_CHMAP_SL;
 391                                 break;
 392                         case UAC3_CH_SIDE_RIGHT:
 393                                 map = SNDRV_CHMAP_SR;
 394                                 break;
 395                         case UAC3_CH_BACK_LEFT:
 396                                 map = SNDRV_CHMAP_RL;
 397                                 break;
 398                         case UAC3_CH_BACK_RIGHT:
 399                                 map = SNDRV_CHMAP_RR;
 400                                 break;
 401                         case UAC3_CH_BACK_CENTER:
 402                                 map = SNDRV_CHMAP_RC;
 403                                 break;
 404                         case UAC3_CH_BACK_LEFT_OF_CENTER:
 405                                 map = SNDRV_CHMAP_RLC;
 406                                 break;
 407                         case UAC3_CH_BACK_RIGHT_OF_CENTER:
 408                                 map = SNDRV_CHMAP_RRC;
 409                                 break;
 410                         case UAC3_CH_TOP_CENTER:
 411                                 map = SNDRV_CHMAP_TC;
 412                                 break;
 413                         case UAC3_CH_TOP_FRONT_LEFT:
 414                                 map = SNDRV_CHMAP_TFL;
 415                                 break;
 416                         case UAC3_CH_TOP_FRONT_RIGHT:
 417                                 map = SNDRV_CHMAP_TFR;
 418                                 break;
 419                         case UAC3_CH_TOP_FRONT_CENTER:
 420                                 map = SNDRV_CHMAP_TFC;
 421                                 break;
 422                         case UAC3_CH_TOP_FRONT_LOC:
 423                                 map = SNDRV_CHMAP_TFLC;
 424                                 break;
 425                         case UAC3_CH_TOP_FRONT_ROC:
 426                                 map = SNDRV_CHMAP_TFRC;
 427                                 break;
 428                         case UAC3_CH_TOP_SIDE_LEFT:
 429                                 map = SNDRV_CHMAP_TSL;
 430                                 break;
 431                         case UAC3_CH_TOP_SIDE_RIGHT:
 432                                 map = SNDRV_CHMAP_TSR;
 433                                 break;
 434                         case UAC3_CH_TOP_BACK_LEFT:
 435                                 map = SNDRV_CHMAP_TRL;
 436                                 break;
 437                         case UAC3_CH_TOP_BACK_RIGHT:
 438                                 map = SNDRV_CHMAP_TRR;
 439                                 break;
 440                         case UAC3_CH_TOP_BACK_CENTER:
 441                                 map = SNDRV_CHMAP_TRC;
 442                                 break;
 443                         case UAC3_CH_BOTTOM_CENTER:
 444                                 map = SNDRV_CHMAP_BC;
 445                                 break;
 446                         case UAC3_CH_LOW_FREQUENCY_EFFECTS:
 447                                 map = SNDRV_CHMAP_LFE;
 448                                 break;
 449                         case UAC3_CH_LFE_LEFT:
 450                                 map = SNDRV_CHMAP_LLFE;
 451                                 break;
 452                         case UAC3_CH_LFE_RIGHT:
 453                                 map = SNDRV_CHMAP_RLFE;
 454                                 break;
 455                         case UAC3_CH_RELATIONSHIP_UNDEFINED:
 456                         default:
 457                                 map = SNDRV_CHMAP_UNKNOWN;
 458                                 break;
 459                         }
 460                         chmap->map[c++] = map;
 461                 }
 462                 p += cs_len;
 463         }
 464
 465         if (channels < c)
 466                 pr_err("%s: channel number mismatch\n", __func__);
 467
 468         chmap->channels = channels;
 469
 470         for (; c < channels; c++)
 471                 chmap->map[c] = SNDRV_CHMAP_UNKNOWN;
 472
 473         return chmap;
 474 }
 475
 476 /*
 477  * add this endpoint to the chip instance.
 478  * if a stream with the same endpoint already exists, append to it.
 479  * if not, create a new pcm stream. note, fp is added to the substream
 480  * fmt_list and will be freed on the chip instance release. do not free
 481  * fp or do remove it from the substream fmt_list to avoid double-free.
 482  */
 483 static int __snd_usb_add_audio_stream(struct snd_usb_audio *chip,
 484                                       int stream,
 485                                       struct audioformat *fp,
 486                                       struct snd_usb_power_domain *pd)
 487
 488 {
 489         struct snd_usb_stream *as;
 490         struct snd_usb_substream *subs;
 491         struct snd_pcm *pcm;
 492         int err;
 493
 494         list_for_each_entry(as, &chip->pcm_list, list) {
 495                 if (as->fmt_type != fp->fmt_type)
 496                         continue;
 497                 subs = &as->substream[stream];
 498                 if (subs->ep_num == fp->endpoint) {
 499                         list_add_tail(&fp->list, &subs->fmt_list);
 500                         subs->num_formats++;
 501                         subs->formats |= fp->formats;
 502                         return 0;
 503                 }
 504         }
 505         /* look for an empty stream */
 506         list_for_each_entry(as, &chip->pcm_list, list) {
 507                 if (as->fmt_type != fp->fmt_type)
 508                         continue;
 509                 subs = &as->substream[stream];
 510                 if (subs->ep_num)
 511                         continue;
 512                 err = snd_pcm_new_stream(as->pcm, stream, 1);
 513                 if (err < 0)
 514                         return err;
 515                 snd_usb_init_substream(as, stream, fp, pd);
 516                 return add_chmap(as->pcm, stream, subs);
 517         }
 518
 519         /* create a new pcm */
 520         as = kzalloc(sizeof(*as), GFP_KERNEL);
 521         if (!as)
 522                 return -ENOMEM;
 523         as->pcm_index = chip->pcm_devs;
 524         as->chip = chip;
 525         as->fmt_type = fp->fmt_type;
 526         err = snd_pcm_new(chip->card, "USB Audio", chip->pcm_devs,
 527                           stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0,
 528                           stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1,
 529                           &pcm);
 530         if (err < 0) {
 531                 kfree(as);
 532                 return err;
 533         }
 534         as->pcm = pcm;
 535         pcm->private_data = as;
 536         pcm->private_free = snd_usb_audio_pcm_free;
 537         pcm->info_flags = 0;
 538         if (chip->pcm_devs > 0)
 539                 sprintf(pcm->name, "USB Audio #%d", chip->pcm_devs);
 540         else
 541                 strcpy(pcm->name, "USB Audio");
 542
 543         snd_usb_init_substream(as, stream, fp, pd);
 544
 545         /*
 546          * Keep using head insertion for M-Audio Audiophile USB (tm) which has a
 547          * fix to swap capture stream order in conf/cards/USB-audio.conf
 548          */
 549         if (chip->usb_id == USB_ID(0x0763, 0x2003))
 550                 list_add(&as->list, &chip->pcm_list);
 551         else
 552                 list_add_tail(&as->list, &chip->pcm_list);
 553
 554         chip->pcm_devs++;
 555
 556         snd_usb_proc_pcm_format_add(as);
 557
 558         return add_chmap(pcm, stream, &as->substream[stream]);
 559 }
 560
 561 int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
 562                              int stream,
 563                              struct audioformat *fp)
 564 {
 565         return __snd_usb_add_audio_stream(chip, stream, fp, NULL);
 566 }
 567
 568 static int snd_usb_add_audio_stream_v3(struct snd_usb_audio *chip,
 569                                        int stream,
 570                                        struct audioformat *fp,
 571                                        struct snd_usb_power_domain *pd)
 572 {
 573         return __snd_usb_add_audio_stream(chip, stream, fp, pd);
 574 }
 575
 576 static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
 577                                          struct usb_host_interface *alts,
 578                                          int protocol, int iface_no)
 579 {
 580         /* parsed with a v1 header here. that's ok as we only look at the
 581          * header first which is the same for both versions */
 582         struct uac_iso_endpoint_descriptor *csep;
 583         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
 584         int attributes = 0;
 585
 586         csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
 587
 588         /* Creamware Noah has this descriptor after the 2nd endpoint */
 589         if (!csep && altsd->bNumEndpoints >= 2)
 590                 csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
 591
 592         /*
 593          * If we can't locate the USB_DT_CS_ENDPOINT descriptor in the extra
 594          * bytes after the first endpoint, go search the entire interface.
 595          * Some devices have it directly *before* the standard endpoint.
 596          */
 597         if (!csep)
 598                 csep = snd_usb_find_desc(alts->extra, alts->extralen, NULL, USB_DT_CS_ENDPOINT);
 599
 600         if (!csep || csep->bLength < 7 ||
 601             csep->bDescriptorSubtype != UAC_EP_GENERAL)
 602                 goto error;
 603
 604         if (protocol == UAC_VERSION_1) {
 605                 attributes = csep->bmAttributes;
 606         } else if (protocol == UAC_VERSION_2) {
 607                 struct uac2_iso_endpoint_descriptor *csep2 =
 608                         (struct uac2_iso_endpoint_descriptor *) csep;
 609
 610                 if (csep2->bLength < sizeof(*csep2))
 611                         goto error;
 612                 attributes = csep->bmAttributes & UAC_EP_CS_ATTR_FILL_MAX;
 613
 614                 /* emulate the endpoint attributes of a v1 device */
 615                 if (csep2->bmControls & UAC2_CONTROL_PITCH)
 616                         attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
 617         } else { /* UAC_VERSION_3 */
 618                 struct uac3_iso_endpoint_descriptor *csep3 =
 619                         (struct uac3_iso_endpoint_descriptor *) csep;
 620
 621                 if (csep3->bLength < sizeof(*csep3))
 622                         goto error;
 623                 /* emulate the endpoint attributes of a v1 device */
 624                 if (le32_to_cpu(csep3->bmControls) & UAC2_CONTROL_PITCH)
 625                         attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
 626         }
 627
 628         return attributes;
 629
 630  error:
 631         usb_audio_warn(chip,
 632                        "%u:%d : no or invalid class specific endpoint descriptor\n",
 633                        iface_no, altsd->bAlternateSetting);
 634         return 0;
 635 }
 636
 637 /* find an input terminal descriptor (either UAC1 or UAC2) with the given
 638  * terminal id
 639  */
 640 static void *
 641 snd_usb_find_input_terminal_descriptor(struct usb_host_interface *ctrl_iface,
 642                                        int terminal_id, bool uac23)
 643 {
 644         struct uac2_input_terminal_descriptor *term = NULL;
 645         size_t minlen = uac23 ? sizeof(struct uac2_input_terminal_descriptor) :
 646                 sizeof(struct uac_input_terminal_descriptor);
 647
 648         while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
 649                                                ctrl_iface->extralen,
 650                                                term, UAC_INPUT_TERMINAL))) {
 651                 if (term->bLength < minlen)
 652                         continue;
 653                 if (term->bTerminalID == terminal_id)
 654                         return term;
 655         }
 656
 657         return NULL;
 658 }
 659
 660 static void *
 661 snd_usb_find_output_terminal_descriptor(struct usb_host_interface *ctrl_iface,
 662                                         int terminal_id)
 663 {
 664         /* OK to use with both UAC2 and UAC3 */
 665         struct uac2_output_terminal_descriptor *term = NULL;
 666
 667         while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
 668                                                ctrl_iface->extralen,
 669                                                term, UAC_OUTPUT_TERMINAL))) {
 670                 if (term->bLength >= sizeof(*term) &&
 671                     term->bTerminalID == terminal_id)
 672                         return term;
 673         }
 674
 675         return NULL;
 676 }
 677
 678 static struct audioformat *
 679 audio_format_alloc_init(struct snd_usb_audio *chip,
 680                        struct usb_host_interface *alts,
 681                        int protocol, int iface_no, int altset_idx,
 682                        int altno, int num_channels, int clock)
 683 {
 684         struct audioformat *fp;
 685
 686         fp = kzalloc(sizeof(*fp), GFP_KERNEL);
 687         if (!fp)
 688                 return NULL;
 689
 690         fp->iface = iface_no;
 691         fp->altsetting = altno;
 692         fp->altset_idx = altset_idx;
 693         fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
 694         fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
 695         fp->datainterval = snd_usb_parse_datainterval(chip, alts);
 696         fp->protocol = protocol;
 697         fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
 698         fp->channels = num_channels;
 699         if (snd_usb_get_speed(chip->dev) == USB_SPEED_HIGH)
 700                 fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
 701                                 * (fp->maxpacksize & 0x7ff);
 702         fp->clock = clock;
 703         INIT_LIST_HEAD(&fp->list);
 704
 705         return fp;
 706 }
 707
 708 static struct audioformat *
 709 snd_usb_get_audioformat_uac12(struct snd_usb_audio *chip,
 710                               struct usb_host_interface *alts,
 711                               int protocol, int iface_no, int altset_idx,
 712                               int altno, int stream, int bm_quirk)
 713 {
 714         struct usb_device *dev = chip->dev;
 715         struct uac_format_type_i_continuous_descriptor *fmt;
 716         unsigned int num_channels = 0, chconfig = 0;
 717         struct audioformat *fp;
 718         int clock = 0;
 719         u64 format;
 720
 721         /* get audio formats */
 722         if (protocol == UAC_VERSION_1) {
 723                 struct uac1_as_header_descriptor *as =
 724                         snd_usb_find_csint_desc(alts->extra, alts->extralen,
 725                                                 NULL, UAC_AS_GENERAL);
 726                 struct uac_input_terminal_descriptor *iterm;
 727
 728                 if (!as) {
 729                         dev_err(&dev->dev,
 730                                 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
 731                                 iface_no, altno);
 732                         return NULL;
 733                 }
 734
 735                 if (as->bLength < sizeof(*as)) {
 736                         dev_err(&dev->dev,
 737                                 "%u:%d : invalid UAC_AS_GENERAL desc\n",
 738                                 iface_no, altno);
 739                         return NULL;
 740                 }
 741
 742                 format = le16_to_cpu(as->wFormatTag); /* remember the format value */
 743
 744                 iterm = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
 745                                                                as->bTerminalLink,
 746                                                                false);
 747                 if (iterm) {
 748                         num_channels = iterm->bNrChannels;
 749                         chconfig = le16_to_cpu(iterm->wChannelConfig);
 750                 }
 751         } else { /* UAC_VERSION_2 */
 752                 struct uac2_input_terminal_descriptor *input_term;
 753                 struct uac2_output_terminal_descriptor *output_term;
 754                 struct uac2_as_header_descriptor *as =
 755                         snd_usb_find_csint_desc(alts->extra, alts->extralen,
 756                                                 NULL, UAC_AS_GENERAL);
 757
 758                 if (!as) {
 759                         dev_err(&dev->dev,
 760                                 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
 761                                 iface_no, altno);
 762                         return NULL;
 763                 }
 764
 765                 if (as->bLength < sizeof(*as)) {
 766                         dev_err(&dev->dev,
 767                                 "%u:%d : invalid UAC_AS_GENERAL desc\n",
 768                                 iface_no, altno);
 769                         return NULL;
 770                 }
 771
 772                 num_channels = as->bNrChannels;
 773                 format = le32_to_cpu(as->bmFormats);
 774                 chconfig = le32_to_cpu(as->bmChannelConfig);
 775
 776                 /*
 777                  * lookup the terminal associated to this interface
 778                  * to extract the clock
 779                  */
 780                 input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
 781                                                                     as->bTerminalLink,
 782                                                                     true);
 783                 if (input_term) {
 784                         clock = input_term->bCSourceID;
 785                         if (!chconfig && (num_channels == input_term->bNrChannels))
 786                                 chconfig = le32_to_cpu(input_term->bmChannelConfig);
 787                         goto found_clock;
 788                 }
 789
 790                 output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
 791                                                                       as->bTerminalLink);
 792                 if (output_term) {
 793                         clock = output_term->bCSourceID;
 794                         goto found_clock;
 795                 }
 796
 797                 dev_err(&dev->dev,
 798                         "%u:%d : bogus bTerminalLink %d\n",
 799                         iface_no, altno, as->bTerminalLink);
 800                 return NULL;
 801         }
 802
 803 found_clock:
 804         /* get format type */
 805         fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen,
 806                                       NULL, UAC_FORMAT_TYPE);
 807         if (!fmt) {
 808                 dev_err(&dev->dev,
 809                         "%u:%d : no UAC_FORMAT_TYPE desc\n",
 810                         iface_no, altno);
 811                 return NULL;
 812         }
 813         if (((protocol == UAC_VERSION_1) && (fmt->bLength < 8))
 814                         || ((protocol == UAC_VERSION_2) &&
 815                                         (fmt->bLength < 6))) {
 816                 dev_err(&dev->dev,
 817                         "%u:%d : invalid UAC_FORMAT_TYPE desc\n",
 818                         iface_no, altno);
 819                 return NULL;
 820         }
 821
 822         /*
 823          * Blue Microphones workaround: The last altsetting is
 824          * identical with the previous one, except for a larger
 825          * packet size, but is actually a mislabeled two-channel
 826          * setting; ignore it.
 827          *
 828          * Part 2: analyze quirk flag and format
 829          */
 830         if (bm_quirk && fmt->bNrChannels == 1 && fmt->bSubframeSize == 2)
 831                 return NULL;
 832
 833         fp = audio_format_alloc_init(chip, alts, protocol, iface_no,
 834                                      altset_idx, altno, num_channels, clock);
 835         if (!fp)
 836                 return ERR_PTR(-ENOMEM);
 837
 838         fp->attributes = parse_uac_endpoint_attributes(chip, alts, protocol,
 839                                                        iface_no);
 840
 841         /* some quirks for attributes here */
 842         snd_usb_audioformat_attributes_quirk(chip, fp, stream);
 843
 844         /* ok, let's parse further... */
 845         if (snd_usb_parse_audio_format(chip, fp, format,
 846                                         fmt, stream) < 0) {
 847                 kfree(fp->rate_table);
 848                 kfree(fp);
 849                 return NULL;
 850         }
 851
 852         /* Create chmap */
 853         if (fp->channels != num_channels)
 854                 chconfig = 0;
 855
 856         fp->chmap = convert_chmap(fp->channels, chconfig, protocol);
 857
 858         return fp;
 859 }
 860
 861 static struct audioformat *
 862 snd_usb_get_audioformat_uac3(struct snd_usb_audio *chip,
 863                              struct usb_host_interface *alts,
 864                              struct snd_usb_power_domain **pd_out,
 865                              int iface_no, int altset_idx,
 866                              int altno, int stream)
 867 {
 868         struct usb_device *dev = chip->dev;
 869         struct uac3_input_terminal_descriptor *input_term;
 870         struct uac3_output_terminal_descriptor *output_term;
 871         struct uac3_cluster_header_descriptor *cluster;
 872         struct uac3_as_header_descriptor *as = NULL;
 873         struct uac3_hc_descriptor_header hc_header;
 874         struct snd_pcm_chmap_elem *chmap;
 875         struct snd_usb_power_domain *pd;
 876         unsigned char badd_profile;
 877         u64 badd_formats = 0;
 878         unsigned int num_channels;
 879         struct audioformat *fp;
 880         u16 cluster_id, wLength;
 881         int clock = 0;
 882         int err;
 883
 884         badd_profile = chip->badd_profile;
 885
 886         if (badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
 887                 unsigned int maxpacksize =
 888                         le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
 889
 890                 switch (maxpacksize) {
 891                 default:
 892                         dev_err(&dev->dev,
 893                                 "%u:%d : incorrect wMaxPacketSize for BADD profile\n",
 894                                 iface_no, altno);
 895                         return NULL;
 896                 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_16:
 897                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_16:
 898                         badd_formats = SNDRV_PCM_FMTBIT_S16_LE;
 899                         num_channels = 1;
 900                         break;
 901                 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_24:
 902                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_24:
 903                         badd_formats = SNDRV_PCM_FMTBIT_S24_3LE;
 904                         num_channels = 1;
 905                         break;
 906                 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_16:
 907                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_16:
 908                         badd_formats = SNDRV_PCM_FMTBIT_S16_LE;
 909                         num_channels = 2;
 910                         break;
 911                 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_24:
 912                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_24:
 913                         badd_formats = SNDRV_PCM_FMTBIT_S24_3LE;
 914                         num_channels = 2;
 915                         break;
 916                 }
 917
 918                 chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
 919                 if (!chmap)
 920                         return ERR_PTR(-ENOMEM);
 921
 922                 if (num_channels == 1) {
 923                         chmap->map[0] = SNDRV_CHMAP_MONO;
 924                 } else {
 925                         chmap->map[0] = SNDRV_CHMAP_FL;
 926                         chmap->map[1] = SNDRV_CHMAP_FR;
 927                 }
 928
 929                 chmap->channels = num_channels;
 930                 clock = UAC3_BADD_CS_ID9;
 931                 goto found_clock;
 932         }
 933
 934         as = snd_usb_find_csint_desc(alts->extra, alts->extralen,
 935                                      NULL, UAC_AS_GENERAL);
 936         if (!as) {
 937                 dev_err(&dev->dev,
 938                         "%u:%d : UAC_AS_GENERAL descriptor not found\n",
 939                         iface_no, altno);
 940                 return NULL;
 941         }
 942
 943         if (as->bLength < sizeof(*as)) {
 944                 dev_err(&dev->dev,
 945                         "%u:%d : invalid UAC_AS_GENERAL desc\n",
 946                         iface_no, altno);
 947                 return NULL;
 948         }
 949
 950         cluster_id = le16_to_cpu(as->wClusterDescrID);
 951         if (!cluster_id) {
 952                 dev_err(&dev->dev,
 953                         "%u:%d : no cluster descriptor\n",
 954                         iface_no, altno);
 955                 return NULL;
 956         }
 957
 958         /*
 959          * Get number of channels and channel map through
 960          * High Capability Cluster Descriptor
 961          *
 962          * First step: get High Capability header and
 963          * read size of Cluster Descriptor
 964          */
 965         err = snd_usb_ctl_msg(chip->dev,
 966                         usb_rcvctrlpipe(chip->dev, 0),
 967                         UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
 968                         USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 969                         cluster_id,
 970                         snd_usb_ctrl_intf(chip),
 971                         &hc_header, sizeof(hc_header));
 972         if (err < 0)
 973                 return ERR_PTR(err);
 974         else if (err != sizeof(hc_header)) {
 975                 dev_err(&dev->dev,
 976                         "%u:%d : can't get High Capability descriptor\n",
 977                         iface_no, altno);
 978                 return ERR_PTR(-EIO);
 979         }
 980
 981         /*
 982          * Second step: allocate needed amount of memory
 983          * and request Cluster Descriptor
 984          */
 985         wLength = le16_to_cpu(hc_header.wLength);
 986         cluster = kzalloc(wLength, GFP_KERNEL);
 987         if (!cluster)
 988                 return ERR_PTR(-ENOMEM);
 989         err = snd_usb_ctl_msg(chip->dev,
 990                         usb_rcvctrlpipe(chip->dev, 0),
 991                         UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
 992                         USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 993                         cluster_id,
 994                         snd_usb_ctrl_intf(chip),
 995                         cluster, wLength);
 996         if (err < 0) {
 997                 kfree(cluster);
 998                 return ERR_PTR(err);
 999         } else if (err != wLength) {
1000                 dev_err(&dev->dev,
1001                         "%u:%d : can't get Cluster Descriptor\n",
1002                         iface_no, altno);
1003                 kfree(cluster);
1004                 return ERR_PTR(-EIO);
1005         }
1006
1007         num_channels = cluster->bNrChannels;
1008         chmap = convert_chmap_v3(cluster);
1009         kfree(cluster);
1010
1011         /*
1012          * lookup the terminal associated to this interface
1013          * to extract the clock
1014          */
1015         input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
1016                                                             as->bTerminalLink,
1017                                                             true);
1018         if (input_term) {
1019                 clock = input_term->bCSourceID;
1020                 goto found_clock;
1021         }
1022
1023         output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
1024                                                              as->bTerminalLink);
1025         if (output_term) {
1026                 clock = output_term->bCSourceID;
1027                 goto found_clock;
1028         }
1029
1030         dev_err(&dev->dev, "%u:%d : bogus bTerminalLink %d\n",
1031                         iface_no, altno, as->bTerminalLink);
1032         kfree(chmap);
1033         return NULL;
1034
1035 found_clock:
1036         fp = audio_format_alloc_init(chip, alts, UAC_VERSION_3, iface_no,
1037                                      altset_idx, altno, num_channels, clock);
1038         if (!fp) {
1039                 kfree(chmap);
1040                 return ERR_PTR(-ENOMEM);
1041         }
1042
1043         fp->chmap = chmap;
1044
1045         if (badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
1046                 fp->attributes = 0; /* No attributes */
1047
1048                 fp->fmt_type = UAC_FORMAT_TYPE_I;
1049                 fp->formats = badd_formats;
1050
1051                 fp->nr_rates = 0;       /* SNDRV_PCM_RATE_CONTINUOUS */
1052                 fp->rate_min = UAC3_BADD_SAMPLING_RATE;
1053                 fp->rate_max = UAC3_BADD_SAMPLING_RATE;
1054                 fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
1055
1056                 pd = kzalloc(sizeof(*pd), GFP_KERNEL);
1057                 if (!pd) {
1058                         kfree(fp->rate_table);
1059                         kfree(fp);
1060                         return NULL;
1061                 }
1062                 pd->pd_id = (stream == SNDRV_PCM_STREAM_PLAYBACK) ?
1063                                         UAC3_BADD_PD_ID10 : UAC3_BADD_PD_ID11;
1064                 pd->pd_d1d0_rec = UAC3_BADD_PD_RECOVER_D1D0;
1065                 pd->pd_d2d0_rec = UAC3_BADD_PD_RECOVER_D2D0;
1066
1067         } else {
1068                 fp->attributes = parse_uac_endpoint_attributes(chip, alts,
1069                                                                UAC_VERSION_3,
1070                                                                iface_no);
1071
1072                 pd = snd_usb_find_power_domain(chip->ctrl_intf,
1073                                                as->bTerminalLink);
1074
1075                 /* ok, let's parse further... */
1076                 if (snd_usb_parse_audio_format_v3(chip, fp, as, stream) < 0) {
1077                         kfree(pd);
1078                         kfree(fp->chmap);
1079                         kfree(fp->rate_table);
1080                         kfree(fp);
1081                         return NULL;
1082                 }
1083         }
1084
1085         if (pd)
1086                 *pd_out = pd;
1087
1088         return fp;
1089 }
1090
1091 int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no)
1092 {
1093         struct usb_device *dev;
1094         struct usb_interface *iface;
1095         struct usb_host_interface *alts;
1096         struct usb_interface_descriptor *altsd;
1097         int i, altno, err, stream;
1098         struct audioformat *fp = NULL;
1099         struct snd_usb_power_domain *pd = NULL;
1100         int num, protocol;
1101
1102         dev = chip->dev;
1103
1104         /* parse the interface's altsettings */
1105         iface = usb_ifnum_to_if(dev, iface_no);
1106
1107         num = iface->num_altsetting;
1108
1109         /*
1110          * Dallas DS4201 workaround: It presents 5 altsettings, but the last
1111          * one misses syncpipe, and does not produce any sound.
1112          */
1113         if (chip->usb_id == USB_ID(0x04fa, 0x4201))
1114                 num = 4;
1115
1116         for (i = 0; i < num; i++) {
1117                 alts = &iface->altsetting[i];
1118                 altsd = get_iface_desc(alts);
1119                 protocol = altsd->bInterfaceProtocol;
1120                 /* skip invalid one */
1121                 if (((altsd->bInterfaceClass != USB_CLASS_AUDIO ||
1122                       (altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING &&
1123                        altsd->bInterfaceSubClass != USB_SUBCLASS_VENDOR_SPEC)) &&
1124                      altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
1125                     altsd->bNumEndpoints < 1 ||
1126                     le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) == 0)
1127                         continue;
1128                 /* must be isochronous */
1129                 if ((get_endpoint(alts, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
1130                     USB_ENDPOINT_XFER_ISOC)
1131                         continue;
1132                 /* check direction */
1133                 stream = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN) ?
1134                         SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
1135                 altno = altsd->bAlternateSetting;
1136
1137                 if (snd_usb_apply_interface_quirk(chip, iface_no, altno))
1138                         continue;
1139
1140                 /*
1141                  * Roland audio streaming interfaces are marked with protocols
1142                  * 0/1/2, but are UAC 1 compatible.
1143                  */
1144                 if (USB_ID_VENDOR(chip->usb_id) == 0x0582 &&
1145                     altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
1146                     protocol <= 2)
1147                         protocol = UAC_VERSION_1;
1148
1149                 switch (protocol) {
1150                 default:
1151                         dev_dbg(&dev->dev, "%u:%d: unknown interface protocol %#02x, assuming v1\n",
1152                                 iface_no, altno, protocol);
1153                         protocol = UAC_VERSION_1;
1154                         /* fall through */
1155                 case UAC_VERSION_1:
1156                         /* fall through */
1157                 case UAC_VERSION_2: {
1158                         int bm_quirk = 0;
1159
1160                         /*
1161                          * Blue Microphones workaround: The last altsetting is
1162                          * identical with the previous one, except for a larger
1163                          * packet size, but is actually a mislabeled two-channel
1164                          * setting; ignore it.
1165                          *
1166                          * Part 1: prepare quirk flag
1167                          */
1168                         if (altno == 2 && num == 3 &&
1169                             fp && fp->altsetting == 1 && fp->channels == 1 &&
1170                             fp->formats == SNDRV_PCM_FMTBIT_S16_LE &&
1171                             protocol == UAC_VERSION_1 &&
1172                             le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) ==
1173                                                         fp->maxpacksize * 2)
1174                                 bm_quirk = 1;
1175
1176                         fp = snd_usb_get_audioformat_uac12(chip, alts, protocol,
1177                                                            iface_no, i, altno,
1178                                                            stream, bm_quirk);
1179                         break;
1180                 }
1181                 case UAC_VERSION_3:
1182                         fp = snd_usb_get_audioformat_uac3(chip, alts, &pd,
1183                                                 iface_no, i, altno, stream);
1184                         break;
1185                 }
1186
1187                 if (!fp)
1188                         continue;
1189                 else if (IS_ERR(fp))
1190                         return PTR_ERR(fp);
1191
1192                 dev_dbg(&dev->dev, "%u:%d: add audio endpoint %#x\n", iface_no, altno, fp->endpoint);
1193                 if (protocol == UAC_VERSION_3)
1194                         err = snd_usb_add_audio_stream_v3(chip, stream, fp, pd);
1195                 else
1196                         err = snd_usb_add_audio_stream(chip, stream, fp);
1197
1198                 if (err < 0) {
1199                         list_del(&fp->list); /* unlink for avoiding double-free */
1200                         kfree(pd);
1201                         kfree(fp->rate_table);
1202                         kfree(fp->chmap);
1203                         kfree(fp);
1204                         return err;
1205                 }
1206                 /* try to set the interface... */
1207                 usb_set_interface(chip->dev, iface_no, altno);
1208                 snd_usb_init_pitch(chip, iface_no, alts, fp);
1209                 snd_usb_init_sample_rate(chip, iface_no, alts, fp, fp->rate_max);
1210         }
1211         return 0;
1212 }
1213