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