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