sound/usb/stream.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  */
   4
   5
   6 #include <linux/init.h>
   7 #include <linux/slab.h>
   8 #include <linux/usb.h>
   9 #include <linux/usb/audio.h>
  10 #include <linux/usb/audio-v2.h>
  11 #include <linux/usb/audio-v3.h>
  12
  13 #include <sound/core.h>
  14 #include <sound/pcm.h>
  15 #include <sound/control.h>
  16 #include <sound/tlv.h>
  17
  18 #include "usbaudio.h"
  19 #include "card.h"
  20 #include "proc.h"
  21 #include "quirks.h"
  22 #include "endpoint.h"
  23 #include "pcm.h"
  24 #include "helper.h"
  25 #include "format.h"
  26 #include "clock.h"
  27 #include "stream.h"
  28 #include "power.h"
  29 #include "media.h"
  30
  31 /*
  32  * free a substream
  33  */
  34 static void free_substream(struct snd_usb_substream *subs)
  35 {
  36         struct audioformat *fp, *n;
  37
  38         if (!subs->num_formats)
  39                 return; /* not initialized */
  40         list_for_each_entry_safe(fp, n, &subs->fmt_list, list) {
  41                 kfree(fp->rate_table);
  42                 kfree(fp->chmap);
  43                 kfree(fp);
  44         }
  45         kfree(subs->rate_list.list);
  46         kfree(subs->str_pd);
  47         snd_media_stream_delete(subs);
  48 }
  49
  50
  51 /*
  52  * free a usb stream instance
  53  */
  54 static void snd_usb_audio_stream_free(struct snd_usb_stream *stream)
  55 {
  56         free_substream(&stream->substream[0]);
  57         free_substream(&stream->substream[1]);
  58         list_del(&stream->list);
  59         kfree(stream);
  60 }
  61
  62 static void snd_usb_audio_pcm_free(struct snd_pcm *pcm)
  63 {
  64         struct snd_usb_stream *stream = pcm->private_data;
  65         if (stream) {
  66                 stream->pcm = NULL;
  67                 snd_usb_audio_stream_free(stream);
  68         }
  69 }
  70
  71 /*
  72  * initialize the substream instance.
  73  */
  74
  75 static void snd_usb_init_substream(struct snd_usb_stream *as,
  76                                    int stream,
  77                                    struct audioformat *fp,
  78                                    struct snd_usb_power_domain *pd)
  79 {
  80         struct snd_usb_substream *subs = &as->substream[stream];
  81
  82         INIT_LIST_HEAD(&subs->fmt_list);
  83         spin_lock_init(&subs->lock);
  84
  85         subs->stream = as;
  86         subs->direction = stream;
  87         subs->dev = as->chip->dev;
  88         subs->txfr_quirk = as->chip->txfr_quirk;
  89         subs->tx_length_quirk = as->chip->tx_length_quirk;
  90         subs->speed = snd_usb_get_speed(subs->dev);
  91         subs->pkt_offset_adj = 0;
  92
  93         snd_usb_set_pcm_ops(as->pcm, stream);
  94
  95         list_add_tail(&fp->list, &subs->fmt_list);
  96         subs->formats |= fp->formats;
  97         subs->num_formats++;
  98         subs->fmt_type = fp->fmt_type;
  99         subs->ep_num = fp->endpoint;
 100         if (fp->channels > subs->channels_max)
 101                 subs->channels_max = fp->channels;
 102
 103         if (pd) {
 104                 subs->str_pd = pd;
 105                 /* Initialize Power Domain to idle status D1 */
 106                 snd_usb_power_domain_set(subs->stream->chip, pd,
 107                                          UAC3_PD_STATE_D1);
 108         }
 109
 110         snd_usb_preallocate_buffer(subs);
 111 }
 112
 113 /* kctl callbacks for usb-audio channel maps */
 114 static int usb_chmap_ctl_info(struct snd_kcontrol *kcontrol,
 115                               struct snd_ctl_elem_info *uinfo)
 116 {
 117         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
 118         struct snd_usb_substream *subs = info->private_data;
 119
 120         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 121         uinfo->count = subs->channels_max;
 122         uinfo->value.integer.min = 0;
 123         uinfo->value.integer.max = SNDRV_CHMAP_LAST;
 124         return 0;
 125 }
 126
 127 /* check whether a duplicated entry exists in the audiofmt list */
 128 static bool have_dup_chmap(struct snd_usb_substream *subs,
 129                            struct audioformat *fp)
 130 {
 131         struct audioformat *prev = fp;
 132
 133         list_for_each_entry_continue_reverse(prev, &subs->fmt_list, list) {
 134                 if (prev->chmap &&
 135                     !memcmp(prev->chmap, fp->chmap, sizeof(*fp->chmap)))
 136                         return true;
 137         }
 138         return false;
 139 }
 140
 141 static int usb_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
 142                              unsigned int size, unsigned int __user *tlv)
 143 {
 144         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
 145         struct snd_usb_substream *subs = info->private_data;
 146         struct audioformat *fp;
 147         unsigned int __user *dst;
 148         int count = 0;
 149
 150         if (size < 8)
 151                 return -ENOMEM;
 152         if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
 153                 return -EFAULT;
 154         size -= 8;
 155         dst = tlv + 2;
 156         list_for_each_entry(fp, &subs->fmt_list, list) {
 157                 int i, ch_bytes;
 158
 159                 if (!fp->chmap)
 160                         continue;
 161                 if (have_dup_chmap(subs, fp))
 162                         continue;
 163                 /* copy the entry */
 164                 ch_bytes = fp->chmap->channels * 4;
 165                 if (size < 8 + ch_bytes)
 166                         return -ENOMEM;
 167                 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
 168                     put_user(ch_bytes, dst + 1))
 169                         return -EFAULT;
 170                 dst += 2;
 171                 for (i = 0; i < fp->chmap->channels; i++, dst++) {
 172                         if (put_user(fp->chmap->map[i], dst))
 173                                 return -EFAULT;
 174                 }
 175
 176                 count += 8 + ch_bytes;
 177                 size -= 8 + ch_bytes;
 178         }
 179         if (put_user(count, tlv + 1))
 180                 return -EFAULT;
 181         return 0;
 182 }
 183
 184 static int usb_chmap_ctl_get(struct snd_kcontrol *kcontrol,
 185                              struct snd_ctl_elem_value *ucontrol)
 186 {
 187         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
 188         struct snd_usb_substream *subs = info->private_data;
 189         struct snd_pcm_chmap_elem *chmap = NULL;
 190         int i;
 191
 192         memset(ucontrol->value.integer.value, 0,
 193                sizeof(ucontrol->value.integer.value));
 194         if (subs->cur_audiofmt)
 195                 chmap = subs->cur_audiofmt->chmap;
 196         if (chmap) {
 197                 for (i = 0; i < chmap->channels; i++)
 198                         ucontrol->value.integer.value[i] = chmap->map[i];
 199         }
 200         return 0;
 201 }
 202
 203 /* create a chmap kctl assigned to the given USB substream */
 204 static int add_chmap(struct snd_pcm *pcm, int stream,
 205                      struct snd_usb_substream *subs)
 206 {
 207         struct audioformat *fp;
 208         struct snd_pcm_chmap *chmap;
 209         struct snd_kcontrol *kctl;
 210         int err;
 211
 212         list_for_each_entry(fp, &subs->fmt_list, list)
 213                 if (fp->chmap)
 214                         goto ok;
 215         /* no chmap is found */
 216         return 0;
 217
 218  ok:
 219         err = snd_pcm_add_chmap_ctls(pcm, stream, NULL, 0, 0, &chmap);
 220         if (err < 0)
 221                 return err;
 222
 223         /* override handlers */
 224         chmap->private_data = subs;
 225         kctl = chmap->kctl;
 226         kctl->info = usb_chmap_ctl_info;
 227         kctl->get = usb_chmap_ctl_get;
 228         kctl->tlv.c = usb_chmap_ctl_tlv;
 229
 230         return 0;
 231 }
 232
 233 /* convert from USB ChannelConfig bits to ALSA chmap element */
 234 static struct snd_pcm_chmap_elem *convert_chmap(int channels, unsigned int bits,
 235                                                 int protocol)
 236 {
 237         static unsigned int uac1_maps[] = {
 238                 SNDRV_CHMAP_FL,         /* left front */
 239                 SNDRV_CHMAP_FR,         /* right front */
 240                 SNDRV_CHMAP_FC,         /* center front */
 241                 SNDRV_CHMAP_LFE,        /* LFE */
 242                 SNDRV_CHMAP_SL,         /* left surround */
 243                 SNDRV_CHMAP_SR,         /* right surround */
 244                 SNDRV_CHMAP_FLC,        /* left of center */
 245                 SNDRV_CHMAP_FRC,        /* right of center */
 246                 SNDRV_CHMAP_RC,         /* surround */
 247                 SNDRV_CHMAP_SL,         /* side left */
 248                 SNDRV_CHMAP_SR,         /* side right */
 249                 SNDRV_CHMAP_TC,         /* top */
 250                 0 /* terminator */
 251         };
 252         static unsigned int uac2_maps[] = {
 253                 SNDRV_CHMAP_FL,         /* front left */
 254                 SNDRV_CHMAP_FR,         /* front right */
 255                 SNDRV_CHMAP_FC,         /* front center */
 256                 SNDRV_CHMAP_LFE,        /* LFE */
 257                 SNDRV_CHMAP_RL,         /* back left */
 258                 SNDRV_CHMAP_RR,         /* back right */
 259                 SNDRV_CHMAP_FLC,        /* front left of center */
 260                 SNDRV_CHMAP_FRC,        /* front right of center */
 261                 SNDRV_CHMAP_RC,         /* back center */
 262                 SNDRV_CHMAP_SL,         /* side left */
 263                 SNDRV_CHMAP_SR,         /* side right */
 264                 SNDRV_CHMAP_TC,         /* top center */
 265                 SNDRV_CHMAP_TFL,        /* top front left */
 266                 SNDRV_CHMAP_TFC,        /* top front center */
 267                 SNDRV_CHMAP_TFR,        /* top front right */
 268                 SNDRV_CHMAP_TRL,        /* top back left */
 269                 SNDRV_CHMAP_TRC,        /* top back center */
 270                 SNDRV_CHMAP_TRR,        /* top back right */
 271                 SNDRV_CHMAP_TFLC,       /* top front left of center */
 272                 SNDRV_CHMAP_TFRC,       /* top front right of center */
 273                 SNDRV_CHMAP_LLFE,       /* left LFE */
 274                 SNDRV_CHMAP_RLFE,       /* right LFE */
 275                 SNDRV_CHMAP_TSL,        /* top side left */
 276                 SNDRV_CHMAP_TSR,        /* top side right */
 277                 SNDRV_CHMAP_BC,         /* bottom center */
 278                 SNDRV_CHMAP_RLC,        /* back left of center */
 279                 SNDRV_CHMAP_RRC,        /* back right of center */
 280                 0 /* terminator */
 281         };
 282         struct snd_pcm_chmap_elem *chmap;
 283         const unsigned int *maps;
 284         int c;
 285
 286         if (channels > ARRAY_SIZE(chmap->map))
 287                 return NULL;
 288
 289         chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
 290         if (!chmap)
 291                 return NULL;
 292
 293         maps = protocol == UAC_VERSION_2 ? uac2_maps : uac1_maps;
 294         chmap->channels = channels;
 295         c = 0;
 296
 297         if (bits) {
 298                 for (; bits && *maps; maps++, bits >>= 1)
 299                         if (bits & 1)
 300                                 chmap->map[c++] = *maps;
 301         } else {
 302                 /* If we're missing wChannelConfig, then guess something
 303                     to make sure the channel map is not skipped entirely */
 304                 if (channels == 1)
 305                         chmap->map[c++] = SNDRV_CHMAP_MONO;
 306                 else
 307                         for (; c < channels && *maps; maps++)
 308                                 chmap->map[c++] = *maps;
 309         }
 310
 311         for (; c < channels; c++)
 312                 chmap->map[c] = SNDRV_CHMAP_UNKNOWN;
 313
 314         return chmap;
 315 }
 316
 317 /* UAC3 device stores channels information in Cluster Descriptors */
 318 static struct
 319 snd_pcm_chmap_elem *convert_chmap_v3(struct uac3_cluster_header_descriptor
 320                                                                 *cluster)
 321 {
 322         unsigned int channels = cluster->bNrChannels;
 323         struct snd_pcm_chmap_elem *chmap;
 324         void *p = cluster;
 325         int len, c;
 326
 327         if (channels > ARRAY_SIZE(chmap->map))
 328                 return NULL;
 329
 330         chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
 331         if (!chmap)
 332                 return NULL;
 333
 334         len = le16_to_cpu(cluster->wLength);
 335         c = 0;
 336         p += sizeof(struct uac3_cluster_header_descriptor);
 337
 338         while (((p - (void *)cluster) < len) && (c < channels)) {
 339                 struct uac3_cluster_segment_descriptor *cs_desc = p;
 340                 u16 cs_len;
 341                 u8 cs_type;
 342
 343                 cs_len = le16_to_cpu(cs_desc->wLength);
 344                 cs_type = cs_desc->bSegmentType;
 345
 346                 if (cs_type == UAC3_CHANNEL_INFORMATION) {
 347                         struct uac3_cluster_information_segment_descriptor *is = p;
 348                         unsigned char map;
 349
 350                         /*
 351                          * TODO: this conversion is not complete, update it
 352                          * after adding UAC3 values to asound.h
 353                          */
 354                         switch (is->bChRelationship) {
 355                         case UAC3_CH_MONO:
 356                                 map = SNDRV_CHMAP_MONO;
 357                                 break;
 358                         case UAC3_CH_LEFT:
 359                         case UAC3_CH_FRONT_LEFT:
 360                         case UAC3_CH_HEADPHONE_LEFT:
 361                                 map = SNDRV_CHMAP_FL;
 362                                 break;
 363                         case UAC3_CH_RIGHT:
 364                         case UAC3_CH_FRONT_RIGHT:
 365                         case UAC3_CH_HEADPHONE_RIGHT:
 366                                 map = SNDRV_CHMAP_FR;
 367                                 break;
 368                         case UAC3_CH_FRONT_CENTER:
 369                                 map = SNDRV_CHMAP_FC;
 370                                 break;
 371                         case UAC3_CH_FRONT_LEFT_OF_CENTER:
 372                                 map = SNDRV_CHMAP_FLC;
 373                                 break;
 374                         case UAC3_CH_FRONT_RIGHT_OF_CENTER:
 375                                 map = SNDRV_CHMAP_FRC;
 376                                 break;
 377                         case UAC3_CH_SIDE_LEFT:
 378                                 map = SNDRV_CHMAP_SL;
 379                                 break;
 380                         case UAC3_CH_SIDE_RIGHT:
 381                                 map = SNDRV_CHMAP_SR;
 382                                 break;
 383                         case UAC3_CH_BACK_LEFT:
 384                                 map = SNDRV_CHMAP_RL;
 385                                 break;
 386                         case UAC3_CH_BACK_RIGHT:
 387                                 map = SNDRV_CHMAP_RR;
 388                                 break;
 389                         case UAC3_CH_BACK_CENTER:
 390                                 map = SNDRV_CHMAP_RC;
 391                                 break;
 392                         case UAC3_CH_BACK_LEFT_OF_CENTER:
 393                                 map = SNDRV_CHMAP_RLC;
 394                                 break;
 395                         case UAC3_CH_BACK_RIGHT_OF_CENTER:
 396                                 map = SNDRV_CHMAP_RRC;
 397                                 break;
 398                         case UAC3_CH_TOP_CENTER:
 399                                 map = SNDRV_CHMAP_TC;
 400                                 break;
 401                         case UAC3_CH_TOP_FRONT_LEFT:
 402                                 map = SNDRV_CHMAP_TFL;
 403                                 break;
 404                         case UAC3_CH_TOP_FRONT_RIGHT:
 405                                 map = SNDRV_CHMAP_TFR;
 406                                 break;
 407                         case UAC3_CH_TOP_FRONT_CENTER:
 408                                 map = SNDRV_CHMAP_TFC;
 409                                 break;
 410                         case UAC3_CH_TOP_FRONT_LOC:
 411                                 map = SNDRV_CHMAP_TFLC;
 412                                 break;
 413                         case UAC3_CH_TOP_FRONT_ROC:
 414                                 map = SNDRV_CHMAP_TFRC;
 415                                 break;
 416                         case UAC3_CH_TOP_SIDE_LEFT:
 417                                 map = SNDRV_CHMAP_TSL;
 418                                 break;
 419                         case UAC3_CH_TOP_SIDE_RIGHT:
 420                                 map = SNDRV_CHMAP_TSR;
 421                                 break;
 422                         case UAC3_CH_TOP_BACK_LEFT:
 423                                 map = SNDRV_CHMAP_TRL;
 424                                 break;
 425                         case UAC3_CH_TOP_BACK_RIGHT:
 426                                 map = SNDRV_CHMAP_TRR;
 427                                 break;
 428                         case UAC3_CH_TOP_BACK_CENTER:
 429                                 map = SNDRV_CHMAP_TRC;
 430                                 break;
 431                         case UAC3_CH_BOTTOM_CENTER:
 432                                 map = SNDRV_CHMAP_BC;
 433                                 break;
 434                         case UAC3_CH_LOW_FREQUENCY_EFFECTS:
 435                                 map = SNDRV_CHMAP_LFE;
 436                                 break;
 437                         case UAC3_CH_LFE_LEFT:
 438                                 map = SNDRV_CHMAP_LLFE;
 439                                 break;
 440                         case UAC3_CH_LFE_RIGHT:
 441                                 map = SNDRV_CHMAP_RLFE;
 442                                 break;
 443                         case UAC3_CH_RELATIONSHIP_UNDEFINED:
 444                         default:
 445                                 map = SNDRV_CHMAP_UNKNOWN;
 446                                 break;
 447                         }
 448                         chmap->map[c++] = map;
 449                 }
 450                 p += cs_len;
 451         }
 452
 453         if (channels < c)
 454                 pr_err("%s: channel number mismatch\n", __func__);
 455
 456         chmap->channels = channels;
 457
 458         for (; c < channels; c++)
 459                 chmap->map[c] = SNDRV_CHMAP_UNKNOWN;
 460
 461         return chmap;
 462 }
 463
 464 /*
 465  * add this endpoint to the chip instance.
 466  * if a stream with the same endpoint already exists, append to it.
 467  * if not, create a new pcm stream. note, fp is added to the substream
 468  * fmt_list and will be freed on the chip instance release. do not free
 469  * fp or do remove it from the substream fmt_list to avoid double-free.
 470  */
 471 static int __snd_usb_add_audio_stream(struct snd_usb_audio *chip,
 472                                       int stream,
 473                                       struct audioformat *fp,
 474                                       struct snd_usb_power_domain *pd)
 475
 476 {
 477         struct snd_usb_stream *as;
 478         struct snd_usb_substream *subs;
 479         struct snd_pcm *pcm;
 480         int err;
 481
 482         list_for_each_entry(as, &chip->pcm_list, list) {
 483                 if (as->fmt_type != fp->fmt_type)
 484                         continue;
 485                 subs = &as->substream[stream];
 486                 if (subs->ep_num == fp->endpoint) {
 487                         list_add_tail(&fp->list, &subs->fmt_list);
 488                         subs->num_formats++;
 489                         subs->formats |= fp->formats;
 490                         return 0;
 491                 }
 492         }
 493         /* look for an empty stream */
 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)
 499                         continue;
 500                 err = snd_pcm_new_stream(as->pcm, stream, 1);
 501                 if (err < 0)
 502                         return err;
 503                 snd_usb_init_substream(as, stream, fp, pd);
 504                 return add_chmap(as->pcm, stream, subs);
 505         }
 506
 507         /* create a new pcm */
 508         as = kzalloc(sizeof(*as), GFP_KERNEL);
 509         if (!as)
 510                 return -ENOMEM;
 511         as->pcm_index = chip->pcm_devs;
 512         as->chip = chip;
 513         as->fmt_type = fp->fmt_type;
 514         err = snd_pcm_new(chip->card, "USB Audio", chip->pcm_devs,
 515                           stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0,
 516                           stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1,
 517                           &pcm);
 518         if (err < 0) {
 519                 kfree(as);
 520                 return err;
 521         }
 522         as->pcm = pcm;
 523         pcm->private_data = as;
 524         pcm->private_free = snd_usb_audio_pcm_free;
 525         pcm->info_flags = 0;
 526         if (chip->pcm_devs > 0)
 527                 sprintf(pcm->name, "USB Audio #%d", chip->pcm_devs);
 528         else
 529                 strcpy(pcm->name, "USB Audio");
 530
 531         snd_usb_init_substream(as, stream, fp, pd);
 532
 533         /*
 534          * Keep using head insertion for M-Audio Audiophile USB (tm) which has a
 535          * fix to swap capture stream order in conf/cards/USB-audio.conf
 536          */
 537         if (chip->usb_id == USB_ID(0x0763, 0x2003))
 538                 list_add(&as->list, &chip->pcm_list);
 539         else
 540                 list_add_tail(&as->list, &chip->pcm_list);
 541
 542         chip->pcm_devs++;
 543
 544         snd_usb_proc_pcm_format_add(as);
 545
 546         return add_chmap(pcm, stream, &as->substream[stream]);
 547 }
 548
 549 int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
 550                              int stream,
 551                              struct audioformat *fp)
 552 {
 553         return __snd_usb_add_audio_stream(chip, stream, fp, NULL);
 554 }
 555
 556 static int snd_usb_add_audio_stream_v3(struct snd_usb_audio *chip,
 557                                        int stream,
 558                                        struct audioformat *fp,
 559                                        struct snd_usb_power_domain *pd)
 560 {
 561         return __snd_usb_add_audio_stream(chip, stream, fp, pd);
 562 }
 563
 564 static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
 565                                          struct usb_host_interface *alts,
 566                                          int protocol, int iface_no)
 567 {
 568         /* parsed with a v1 header here. that's ok as we only look at the
 569          * header first which is the same for both versions */
 570         struct uac_iso_endpoint_descriptor *csep;
 571         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
 572         int attributes = 0;
 573
 574         csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
 575
 576         /* Creamware Noah has this descriptor after the 2nd endpoint */
 577         if (!csep && altsd->bNumEndpoints >= 2)
 578                 csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
 579
 580         /*
 581          * If we can't locate the USB_DT_CS_ENDPOINT descriptor in the extra
 582          * bytes after the first endpoint, go search the entire interface.
 583          * Some devices have it directly *before* the standard endpoint.
 584          */
 585         if (!csep)
 586                 csep = snd_usb_find_desc(alts->extra, alts->extralen, NULL, USB_DT_CS_ENDPOINT);
 587
 588         if (!csep || csep->bLength < 7 ||
 589             csep->bDescriptorSubtype != UAC_EP_GENERAL)
 590                 goto error;
 591
 592         if (protocol == UAC_VERSION_1) {
 593                 attributes = csep->bmAttributes;
 594         } else if (protocol == UAC_VERSION_2) {
 595                 struct uac2_iso_endpoint_descriptor *csep2 =
 596                         (struct uac2_iso_endpoint_descriptor *) csep;
 597
 598                 if (csep2->bLength < sizeof(*csep2))
 599                         goto error;
 600                 attributes = csep->bmAttributes & UAC_EP_CS_ATTR_FILL_MAX;
 601
 602                 /* emulate the endpoint attributes of a v1 device */
 603                 if (csep2->bmControls & UAC2_CONTROL_PITCH)
 604                         attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
 605         } else { /* UAC_VERSION_3 */
 606                 struct uac3_iso_endpoint_descriptor *csep3 =
 607                         (struct uac3_iso_endpoint_descriptor *) csep;
 608
 609                 if (csep3->bLength < sizeof(*csep3))
 610                         goto error;
 611                 /* emulate the endpoint attributes of a v1 device */
 612                 if (le32_to_cpu(csep3->bmControls) & UAC2_CONTROL_PITCH)
 613                         attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
 614         }
 615
 616         return attributes;
 617
 618  error:
 619         usb_audio_warn(chip,
 620                        "%u:%d : no or invalid class specific endpoint descriptor\n",
 621                        iface_no, altsd->bAlternateSetting);
 622         return 0;
 623 }
 624
 625 /* find an input terminal descriptor (either UAC1 or UAC2) with the given
 626  * terminal id
 627  */
 628 static void *
 629 snd_usb_find_input_terminal_descriptor(struct usb_host_interface *ctrl_iface,
 630                                        int terminal_id, bool uac23)
 631 {
 632         struct uac2_input_terminal_descriptor *term = NULL;
 633         size_t minlen = uac23 ? sizeof(struct uac2_input_terminal_descriptor) :
 634                 sizeof(struct uac_input_terminal_descriptor);
 635
 636         while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
 637                                                ctrl_iface->extralen,
 638                                                term, UAC_INPUT_TERMINAL))) {
 639                 if (term->bLength < minlen)
 640                         continue;
 641                 if (term->bTerminalID == terminal_id)
 642                         return term;
 643         }
 644
 645         return NULL;
 646 }
 647
 648 static void *
 649 snd_usb_find_output_terminal_descriptor(struct usb_host_interface *ctrl_iface,
 650                                         int terminal_id)
 651 {
 652         /* OK to use with both UAC2 and UAC3 */
 653         struct uac2_output_terminal_descriptor *term = NULL;
 654
 655         while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
 656                                                ctrl_iface->extralen,
 657                                                term, UAC_OUTPUT_TERMINAL))) {
 658                 if (term->bLength >= sizeof(*term) &&
 659                     term->bTerminalID == terminal_id)
 660                         return term;
 661         }
 662
 663         return NULL;
 664 }
 665
 666 static struct audioformat *
 667 audio_format_alloc_init(struct snd_usb_audio *chip,
 668                        struct usb_host_interface *alts,
 669                        int protocol, int iface_no, int altset_idx,
 670                        int altno, int num_channels, int clock)
 671 {
 672         struct audioformat *fp;
 673
 674         fp = kzalloc(sizeof(*fp), GFP_KERNEL);
 675         if (!fp)
 676                 return NULL;
 677
 678         fp->iface = iface_no;
 679         fp->altsetting = altno;
 680         fp->altset_idx = altset_idx;
 681         fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
 682         fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
 683         fp->datainterval = snd_usb_parse_datainterval(chip, alts);
 684         fp->protocol = protocol;
 685         fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
 686         fp->channels = num_channels;
 687         if (snd_usb_get_speed(chip->dev) == USB_SPEED_HIGH)
 688                 fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
 689                                 * (fp->maxpacksize & 0x7ff);
 690         fp->clock = clock;
 691         INIT_LIST_HEAD(&fp->list);
 692
 693         return fp;
 694 }
 695
 696 static struct audioformat *
 697 snd_usb_get_audioformat_uac12(struct snd_usb_audio *chip,
 698                               struct usb_host_interface *alts,
 699                               int protocol, int iface_no, int altset_idx,
 700                               int altno, int stream, int bm_quirk)
 701 {
 702         struct usb_device *dev = chip->dev;
 703         struct uac_format_type_i_continuous_descriptor *fmt;
 704         unsigned int num_channels = 0, chconfig = 0;
 705         struct audioformat *fp;
 706         int clock = 0;
 707         u64 format;
 708
 709         /* get audio formats */
 710         if (protocol == UAC_VERSION_1) {
 711                 struct uac1_as_header_descriptor *as =
 712                         snd_usb_find_csint_desc(alts->extra, alts->extralen,
 713                                                 NULL, UAC_AS_GENERAL);
 714                 struct uac_input_terminal_descriptor *iterm;
 715
 716                 if (!as) {
 717                         dev_err(&dev->dev,
 718                                 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
 719                                 iface_no, altno);
 720                         return NULL;
 721                 }
 722
 723                 if (as->bLength < sizeof(*as)) {
 724                         dev_err(&dev->dev,
 725                                 "%u:%d : invalid UAC_AS_GENERAL desc\n",
 726                                 iface_no, altno);
 727                         return NULL;
 728                 }
 729
 730                 format = le16_to_cpu(as->wFormatTag); /* remember the format value */
 731
 732                 iterm = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
 733                                                                as->bTerminalLink,
 734                                                                false);
 735                 if (iterm) {
 736                         num_channels = iterm->bNrChannels;
 737                         chconfig = le16_to_cpu(iterm->wChannelConfig);
 738                 }
 739         } else { /* UAC_VERSION_2 */
 740                 struct uac2_input_terminal_descriptor *input_term;
 741                 struct uac2_output_terminal_descriptor *output_term;
 742                 struct uac2_as_header_descriptor *as =
 743                         snd_usb_find_csint_desc(alts->extra, alts->extralen,
 744                                                 NULL, UAC_AS_GENERAL);
 745
 746                 if (!as) {
 747                         dev_err(&dev->dev,
 748                                 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
 749                                 iface_no, altno);
 750                         return NULL;
 751                 }
 752
 753                 if (as->bLength < sizeof(*as)) {
 754                         dev_err(&dev->dev,
 755                                 "%u:%d : invalid UAC_AS_GENERAL desc\n",
 756                                 iface_no, altno);
 757                         return NULL;
 758                 }
 759
 760                 num_channels = as->bNrChannels;
 761                 format = le32_to_cpu(as->bmFormats);
 762                 chconfig = le32_to_cpu(as->bmChannelConfig);
 763
 764                 /*
 765                  * lookup the terminal associated to this interface
 766                  * to extract the clock
 767                  */
 768                 input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
 769                                                                     as->bTerminalLink,
 770                                                                     true);
 771                 if (input_term) {
 772                         clock = input_term->bCSourceID;
 773                         if (!chconfig && (num_channels == input_term->bNrChannels))
 774                                 chconfig = le32_to_cpu(input_term->bmChannelConfig);
 775                         goto found_clock;
 776                 }
 777
 778                 output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
 779                                                                       as->bTerminalLink);
 780                 if (output_term) {
 781                         clock = output_term->bCSourceID;
 782                         goto found_clock;
 783                 }
 784
 785                 dev_err(&dev->dev,
 786                         "%u:%d : bogus bTerminalLink %d\n",
 787                         iface_no, altno, as->bTerminalLink);
 788                 return NULL;
 789         }
 790
 791 found_clock:
 792         /* get format type */
 793         fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen,
 794                                       NULL, UAC_FORMAT_TYPE);
 795         if (!fmt) {
 796                 dev_err(&dev->dev,
 797                         "%u:%d : no UAC_FORMAT_TYPE desc\n",
 798                         iface_no, altno);
 799                 return NULL;
 800         }
 801         if (((protocol == UAC_VERSION_1) && (fmt->bLength < 8))
 802                         || ((protocol == UAC_VERSION_2) &&
 803                                         (fmt->bLength < 6))) {
 804                 dev_err(&dev->dev,
 805                         "%u:%d : invalid UAC_FORMAT_TYPE desc\n",
 806                         iface_no, altno);
 807                 return NULL;
 808         }
 809
 810         /*
 811          * Blue Microphones workaround: The last altsetting is
 812          * identical with the previous one, except for a larger
 813          * packet size, but is actually a mislabeled two-channel
 814          * setting; ignore it.
 815          *
 816          * Part 2: analyze quirk flag and format
 817          */
 818         if (bm_quirk && fmt->bNrChannels == 1 && fmt->bSubframeSize == 2)
 819                 return NULL;
 820
 821         fp = audio_format_alloc_init(chip, alts, protocol, iface_no,
 822                                      altset_idx, altno, num_channels, clock);
 823         if (!fp)
 824                 return ERR_PTR(-ENOMEM);
 825
 826         fp->attributes = parse_uac_endpoint_attributes(chip, alts, protocol,
 827                                                        iface_no);
 828
 829         /* some quirks for attributes here */
 830         snd_usb_audioformat_attributes_quirk(chip, fp, stream);
 831
 832         /* ok, let's parse further... */
 833         if (snd_usb_parse_audio_format(chip, fp, format,
 834                                         fmt, stream) < 0) {
 835                 kfree(fp->rate_table);
 836                 kfree(fp);
 837                 return NULL;
 838         }
 839
 840         /* Create chmap */
 841         if (fp->channels != num_channels)
 842                 chconfig = 0;
 843
 844         fp->chmap = convert_chmap(fp->channels, chconfig, protocol);
 845
 846         return fp;
 847 }
 848
 849 static struct audioformat *
 850 snd_usb_get_audioformat_uac3(struct snd_usb_audio *chip,
 851                              struct usb_host_interface *alts,
 852                              struct snd_usb_power_domain **pd_out,
 853                              int iface_no, int altset_idx,
 854                              int altno, int stream)
 855 {
 856         struct usb_device *dev = chip->dev;
 857         struct uac3_input_terminal_descriptor *input_term;
 858         struct uac3_output_terminal_descriptor *output_term;
 859         struct uac3_cluster_header_descriptor *cluster;
 860         struct uac3_as_header_descriptor *as = NULL;
 861         struct uac3_hc_descriptor_header hc_header;
 862         struct snd_pcm_chmap_elem *chmap;
 863         struct snd_usb_power_domain *pd;
 864         unsigned char badd_profile;
 865         u64 badd_formats = 0;
 866         unsigned int num_channels;
 867         struct audioformat *fp;
 868         u16 cluster_id, wLength;
 869         int clock = 0;
 870         int err;
 871
 872         badd_profile = chip->badd_profile;
 873
 874         if (badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
 875                 unsigned int maxpacksize =
 876                         le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
 877
 878                 switch (maxpacksize) {
 879                 default:
 880                         dev_err(&dev->dev,
 881                                 "%u:%d : incorrect wMaxPacketSize for BADD profile\n",
 882                                 iface_no, altno);
 883                         return NULL;
 884                 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_16:
 885                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_16:
 886                         badd_formats = SNDRV_PCM_FMTBIT_S16_LE;
 887                         num_channels = 1;
 888                         break;
 889                 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_24:
 890                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_24:
 891                         badd_formats = SNDRV_PCM_FMTBIT_S24_3LE;
 892                         num_channels = 1;
 893                         break;
 894                 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_16:
 895                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_16:
 896                         badd_formats = SNDRV_PCM_FMTBIT_S16_LE;
 897                         num_channels = 2;
 898                         break;
 899                 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_24:
 900                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_24:
 901                         badd_formats = SNDRV_PCM_FMTBIT_S24_3LE;
 902                         num_channels = 2;
 903                         break;
 904                 }
 905
 906                 chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
 907                 if (!chmap)
 908                         return ERR_PTR(-ENOMEM);
 909
 910                 if (num_channels == 1) {
 911                         chmap->map[0] = SNDRV_CHMAP_MONO;
 912                 } else {
 913                         chmap->map[0] = SNDRV_CHMAP_FL;
 914                         chmap->map[1] = SNDRV_CHMAP_FR;
 915                 }
 916
 917                 chmap->channels = num_channels;
 918                 clock = UAC3_BADD_CS_ID9;
 919                 goto found_clock;
 920         }
 921
 922         as = snd_usb_find_csint_desc(alts->extra, alts->extralen,
 923                                      NULL, UAC_AS_GENERAL);
 924         if (!as) {
 925                 dev_err(&dev->dev,
 926                         "%u:%d : UAC_AS_GENERAL descriptor not found\n",
 927                         iface_no, altno);
 928                 return NULL;
 929         }
 930
 931         if (as->bLength < sizeof(*as)) {
 932                 dev_err(&dev->dev,
 933                         "%u:%d : invalid UAC_AS_GENERAL desc\n",
 934                         iface_no, altno);
 935                 return NULL;
 936         }
 937
 938         cluster_id = le16_to_cpu(as->wClusterDescrID);
 939         if (!cluster_id) {
 940                 dev_err(&dev->dev,
 941                         "%u:%d : no cluster descriptor\n",
 942                         iface_no, altno);
 943                 return NULL;
 944         }
 945
 946         /*
 947          * Get number of channels and channel map through
 948          * High Capability Cluster Descriptor
 949          *
 950          * First step: get High Capability header and
 951          * read size of Cluster Descriptor
 952          */
 953         err = snd_usb_ctl_msg(chip->dev,
 954                         usb_rcvctrlpipe(chip->dev, 0),
 955                         UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
 956                         USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 957                         cluster_id,
 958                         snd_usb_ctrl_intf(chip),
 959                         &hc_header, sizeof(hc_header));
 960         if (err < 0)
 961                 return ERR_PTR(err);
 962         else if (err != sizeof(hc_header)) {
 963                 dev_err(&dev->dev,
 964                         "%u:%d : can't get High Capability descriptor\n",
 965                         iface_no, altno);
 966                 return ERR_PTR(-EIO);
 967         }
 968
 969         /*
 970          * Second step: allocate needed amount of memory
 971          * and request Cluster Descriptor
 972          */
 973         wLength = le16_to_cpu(hc_header.wLength);
 974         cluster = kzalloc(wLength, GFP_KERNEL);
 975         if (!cluster)
 976                 return ERR_PTR(-ENOMEM);
 977         err = snd_usb_ctl_msg(chip->dev,
 978                         usb_rcvctrlpipe(chip->dev, 0),
 979                         UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
 980                         USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 981                         cluster_id,
 982                         snd_usb_ctrl_intf(chip),
 983                         cluster, wLength);
 984         if (err < 0) {
 985                 kfree(cluster);
 986                 return ERR_PTR(err);
 987         } else if (err != wLength) {
 988                 dev_err(&dev->dev,
 989                         "%u:%d : can't get Cluster Descriptor\n",
 990                         iface_no, altno);
 991                 kfree(cluster);
 992                 return ERR_PTR(-EIO);
 993         }
 994
 995         num_channels = cluster->bNrChannels;
 996         chmap = convert_chmap_v3(cluster);
 997         kfree(cluster);
 998
 999         /*
1000          * lookup the terminal associated to this interface
1001          * to extract the clock
1002          */
1003         input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
1004                                                             as->bTerminalLink,
1005                                                             true);
1006         if (input_term) {
1007                 clock = input_term->bCSourceID;
1008                 goto found_clock;
1009         }
1010
1011         output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
1012                                                              as->bTerminalLink);
1013         if (output_term) {
1014                 clock = output_term->bCSourceID;
1015                 goto found_clock;
1016         }
1017
1018         dev_err(&dev->dev, "%u:%d : bogus bTerminalLink %d\n",
1019                         iface_no, altno, as->bTerminalLink);
1020         kfree(chmap);
1021         return NULL;
1022
1023 found_clock:
1024         fp = audio_format_alloc_init(chip, alts, UAC_VERSION_3, iface_no,
1025                                      altset_idx, altno, num_channels, clock);
1026         if (!fp) {
1027                 kfree(chmap);
1028                 return ERR_PTR(-ENOMEM);
1029         }
1030
1031         fp->chmap = chmap;
1032
1033         if (badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
1034                 fp->attributes = 0; /* No attributes */
1035
1036                 fp->fmt_type = UAC_FORMAT_TYPE_I;
1037                 fp->formats = badd_formats;
1038
1039                 fp->nr_rates = 0;       /* SNDRV_PCM_RATE_CONTINUOUS */
1040                 fp->rate_min = UAC3_BADD_SAMPLING_RATE;
1041                 fp->rate_max = UAC3_BADD_SAMPLING_RATE;
1042                 fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
1043
1044                 pd = kzalloc(sizeof(*pd), GFP_KERNEL);
1045                 if (!pd) {
1046                         kfree(fp->chmap);
1047                         kfree(fp->rate_table);
1048                         kfree(fp);
1049                         return NULL;
1050                 }
1051                 pd->pd_id = (stream == SNDRV_PCM_STREAM_PLAYBACK) ?
1052                                         UAC3_BADD_PD_ID10 : UAC3_BADD_PD_ID11;
1053                 pd->pd_d1d0_rec = UAC3_BADD_PD_RECOVER_D1D0;
1054                 pd->pd_d2d0_rec = UAC3_BADD_PD_RECOVER_D2D0;
1055
1056         } else {
1057                 fp->attributes = parse_uac_endpoint_attributes(chip, alts,
1058                                                                UAC_VERSION_3,
1059                                                                iface_no);
1060
1061                 pd = snd_usb_find_power_domain(chip->ctrl_intf,
1062                                                as->bTerminalLink);
1063
1064                 /* ok, let's parse further... */
1065                 if (snd_usb_parse_audio_format_v3(chip, fp, as, stream) < 0) {
1066                         kfree(pd);
1067                         kfree(fp->chmap);
1068                         kfree(fp->rate_table);
1069                         kfree(fp);
1070                         return NULL;
1071                 }
1072         }
1073
1074         if (pd)
1075                 *pd_out = pd;
1076
1077         return fp;
1078 }
1079
1080 int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no)
1081 {
1082         struct usb_device *dev;
1083         struct usb_interface *iface;
1084         struct usb_host_interface *alts;
1085         struct usb_interface_descriptor *altsd;
1086         int i, altno, err, stream;
1087         struct audioformat *fp = NULL;
1088         struct snd_usb_power_domain *pd = NULL;
1089         int num, protocol;
1090
1091         dev = chip->dev;
1092
1093         /* parse the interface's altsettings */
1094         iface = usb_ifnum_to_if(dev, iface_no);
1095
1096         num = iface->num_altsetting;
1097
1098         /*
1099          * Dallas DS4201 workaround: It presents 5 altsettings, but the last
1100          * one misses syncpipe, and does not produce any sound.
1101          */
1102         if (chip->usb_id == USB_ID(0x04fa, 0x4201))
1103                 num = 4;
1104
1105         for (i = 0; i < num; i++) {
1106                 alts = &iface->altsetting[i];
1107                 altsd = get_iface_desc(alts);
1108                 protocol = altsd->bInterfaceProtocol;
1109                 /* skip invalid one */
1110                 if (((altsd->bInterfaceClass != USB_CLASS_AUDIO ||
1111                       (altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING &&
1112                        altsd->bInterfaceSubClass != USB_SUBCLASS_VENDOR_SPEC)) &&
1113                      altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
1114                     altsd->bNumEndpoints < 1 ||
1115                     le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) == 0)
1116                         continue;
1117                 /* must be isochronous */
1118                 if ((get_endpoint(alts, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
1119                     USB_ENDPOINT_XFER_ISOC)
1120                         continue;
1121                 /* check direction */
1122                 stream = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN) ?
1123                         SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
1124                 altno = altsd->bAlternateSetting;
1125
1126                 if (snd_usb_apply_interface_quirk(chip, iface_no, altno))
1127                         continue;
1128
1129                 /*
1130                  * Roland audio streaming interfaces are marked with protocols
1131                  * 0/1/2, but are UAC 1 compatible.
1132                  */
1133                 if (USB_ID_VENDOR(chip->usb_id) == 0x0582 &&
1134                     altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
1135                     protocol <= 2)
1136                         protocol = UAC_VERSION_1;
1137
1138                 switch (protocol) {
1139                 default:
1140                         dev_dbg(&dev->dev, "%u:%d: unknown interface protocol %#02x, assuming v1\n",
1141                                 iface_no, altno, protocol);
1142                         protocol = UAC_VERSION_1;
1143                         /* fall through */
1144                 case UAC_VERSION_1:
1145                         /* fall through */
1146                 case UAC_VERSION_2: {
1147                         int bm_quirk = 0;
1148
1149                         /*
1150                          * Blue Microphones workaround: The last altsetting is
1151                          * identical with the previous one, except for a larger
1152                          * packet size, but is actually a mislabeled two-channel
1153                          * setting; ignore it.
1154                          *
1155                          * Part 1: prepare quirk flag
1156                          */
1157                         if (altno == 2 && num == 3 &&
1158                             fp && fp->altsetting == 1 && fp->channels == 1 &&
1159                             fp->formats == SNDRV_PCM_FMTBIT_S16_LE &&
1160                             protocol == UAC_VERSION_1 &&
1161                             le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) ==
1162                                                         fp->maxpacksize * 2)
1163                                 bm_quirk = 1;
1164
1165                         fp = snd_usb_get_audioformat_uac12(chip, alts, protocol,
1166                                                            iface_no, i, altno,
1167                                                            stream, bm_quirk);
1168                         break;
1169                 }
1170                 case UAC_VERSION_3:
1171                         fp = snd_usb_get_audioformat_uac3(chip, alts, &pd,
1172                                                 iface_no, i, altno, stream);
1173                         break;
1174                 }
1175
1176                 if (!fp)
1177                         continue;
1178                 else if (IS_ERR(fp))
1179                         return PTR_ERR(fp);
1180
1181                 dev_dbg(&dev->dev, "%u:%d: add audio endpoint %#x\n", iface_no, altno, fp->endpoint);
1182                 if (protocol == UAC_VERSION_3)
1183                         err = snd_usb_add_audio_stream_v3(chip, stream, fp, pd);
1184                 else
1185                         err = snd_usb_add_audio_stream(chip, stream, fp);
1186
1187                 if (err < 0) {
1188                         list_del(&fp->list); /* unlink for avoiding double-free */
1189                         kfree(pd);
1190                         kfree(fp->rate_table);
1191                         kfree(fp->chmap);
1192                         kfree(fp);
1193                         return err;
1194                 }
1195                 /* try to set the interface... */
1196                 usb_set_interface(chip->dev, iface_no, altno);
1197                 snd_usb_init_pitch(chip, iface_no, alts, fp);
1198                 snd_usb_init_sample_rate(chip, iface_no, alts, fp, fp->rate_max);
1199         }
1200         return 0;
1201 }
1202