sound/usb/format.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  */
   4
   5 #include <linux/init.h>
   6 #include <linux/slab.h>
   7 #include <linux/usb.h>
   8 #include <linux/usb/audio.h>
   9 #include <linux/usb/audio-v2.h>
  10 #include <linux/usb/audio-v3.h>
  11
  12 #include <sound/core.h>
  13 #include <sound/pcm.h>
  14
  15 #include "usbaudio.h"
  16 #include "card.h"
  17 #include "quirks.h"
  18 #include "helper.h"
  19 #include "debug.h"
  20 #include "clock.h"
  21 #include "format.h"
  22
  23 /*
  24  * parse the audio format type I descriptor
  25  * and returns the corresponding pcm format
  26  *
  27  * @dev: usb device
  28  * @fp: audioformat record
  29  * @format: the format tag (wFormatTag)
  30  * @fmt: the format type descriptor (v1/v2) or AudioStreaming descriptor (v3)
  31  */
  32 static u64 parse_audio_format_i_type(struct snd_usb_audio *chip,
  33                                      struct audioformat *fp,
  34                                      u64 format, void *_fmt)
  35 {
  36         int sample_width, sample_bytes;
  37         u64 pcm_formats = 0;
  38
  39         switch (fp->protocol) {
  40         case UAC_VERSION_1:
  41         default: {
  42                 struct uac_format_type_i_discrete_descriptor *fmt = _fmt;
  43                 sample_width = fmt->bBitResolution;
  44                 sample_bytes = fmt->bSubframeSize;
  45                 format = 1ULL << format;
  46                 break;
  47         }
  48
  49         case UAC_VERSION_2: {
  50                 struct uac_format_type_i_ext_descriptor *fmt = _fmt;
  51                 sample_width = fmt->bBitResolution;
  52                 sample_bytes = fmt->bSubslotSize;
  53
  54                 if (format & UAC2_FORMAT_TYPE_I_RAW_DATA) {
  55                         pcm_formats |= SNDRV_PCM_FMTBIT_SPECIAL;
  56                         /* flag potentially raw DSD capable altsettings */
  57                         fp->dsd_raw = true;
  58                 }
  59
  60                 format <<= 1;
  61                 break;
  62         }
  63         case UAC_VERSION_3: {
  64                 struct uac3_as_header_descriptor *as = _fmt;
  65
  66                 sample_width = as->bBitResolution;
  67                 sample_bytes = as->bSubslotSize;
  68
  69                 if (format & UAC3_FORMAT_TYPE_I_RAW_DATA)
  70                         pcm_formats |= SNDRV_PCM_FMTBIT_SPECIAL;
  71
  72                 format <<= 1;
  73                 break;
  74         }
  75         }
  76
  77         fp->fmt_bits = sample_width;
  78
  79         if ((pcm_formats == 0) &&
  80             (format == 0 || format == (1 << UAC_FORMAT_TYPE_I_UNDEFINED))) {
  81                 /* some devices don't define this correctly... */
  82                 usb_audio_info(chip, "%u:%d : format type 0 is detected, processed as PCM\n",
  83                         fp->iface, fp->altsetting);
  84                 format = 1 << UAC_FORMAT_TYPE_I_PCM;
  85         }
  86         if (format & (1 << UAC_FORMAT_TYPE_I_PCM)) {
  87                 if (((chip->usb_id == USB_ID(0x0582, 0x0016)) ||
  88                      /* Edirol SD-90 */
  89                      (chip->usb_id == USB_ID(0x0582, 0x000c))) &&
  90                      /* Roland SC-D70 */
  91                     sample_width == 24 && sample_bytes == 2)
  92                         sample_bytes = 3;
  93                 else if (sample_width > sample_bytes * 8) {
  94                         usb_audio_info(chip, "%u:%d : sample bitwidth %d in over sample bytes %d\n",
  95                                  fp->iface, fp->altsetting,
  96                                  sample_width, sample_bytes);
  97                 }
  98                 /* check the format byte size */
  99                 switch (sample_bytes) {
 100                 case 1:
 101                         pcm_formats |= SNDRV_PCM_FMTBIT_S8;
 102                         break;
 103                 case 2:
 104                         if (snd_usb_is_big_endian_format(chip, fp))
 105                                 pcm_formats |= SNDRV_PCM_FMTBIT_S16_BE; /* grrr, big endian!! */
 106                         else
 107                                 pcm_formats |= SNDRV_PCM_FMTBIT_S16_LE;
 108                         break;
 109                 case 3:
 110                         if (snd_usb_is_big_endian_format(chip, fp))
 111                                 pcm_formats |= SNDRV_PCM_FMTBIT_S24_3BE; /* grrr, big endian!! */
 112                         else
 113                                 pcm_formats |= SNDRV_PCM_FMTBIT_S24_3LE;
 114                         break;
 115                 case 4:
 116                         pcm_formats |= SNDRV_PCM_FMTBIT_S32_LE;
 117                         break;
 118                 default:
 119                         usb_audio_info(chip,
 120                                  "%u:%d : unsupported sample bitwidth %d in %d bytes\n",
 121                                  fp->iface, fp->altsetting,
 122                                  sample_width, sample_bytes);
 123                         break;
 124                 }
 125         }
 126         if (format & (1 << UAC_FORMAT_TYPE_I_PCM8)) {
 127                 /* Dallas DS4201 workaround: it advertises U8 format, but really
 128                    supports S8. */
 129                 if (chip->usb_id == USB_ID(0x04fa, 0x4201))
 130                         pcm_formats |= SNDRV_PCM_FMTBIT_S8;
 131                 else
 132                         pcm_formats |= SNDRV_PCM_FMTBIT_U8;
 133         }
 134         if (format & (1 << UAC_FORMAT_TYPE_I_IEEE_FLOAT)) {
 135                 pcm_formats |= SNDRV_PCM_FMTBIT_FLOAT_LE;
 136         }
 137         if (format & (1 << UAC_FORMAT_TYPE_I_ALAW)) {
 138                 pcm_formats |= SNDRV_PCM_FMTBIT_A_LAW;
 139         }
 140         if (format & (1 << UAC_FORMAT_TYPE_I_MULAW)) {
 141                 pcm_formats |= SNDRV_PCM_FMTBIT_MU_LAW;
 142         }
 143         if (format & ~0x3f) {
 144                 usb_audio_info(chip,
 145                          "%u:%d : unsupported format bits %#llx\n",
 146                          fp->iface, fp->altsetting, format);
 147         }
 148
 149         pcm_formats |= snd_usb_interface_dsd_format_quirks(chip, fp, sample_bytes);
 150
 151         return pcm_formats;
 152 }
 153
 154
 155 /*
 156  * parse the format descriptor and stores the possible sample rates
 157  * on the audioformat table (audio class v1).
 158  *
 159  * @dev: usb device
 160  * @fp: audioformat record
 161  * @fmt: the format descriptor
 162  * @offset: the start offset of descriptor pointing the rate type
 163  *          (7 for type I and II, 8 for type II)
 164  */
 165 static int parse_audio_format_rates_v1(struct snd_usb_audio *chip, struct audioformat *fp,
 166                                        unsigned char *fmt, int offset)
 167 {
 168         int nr_rates = fmt[offset];
 169
 170         if (fmt[0] < offset + 1 + 3 * (nr_rates ? nr_rates : 2)) {
 171                 usb_audio_err(chip,
 172                         "%u:%d : invalid UAC_FORMAT_TYPE desc\n",
 173                         fp->iface, fp->altsetting);
 174                 return -EINVAL;
 175         }
 176
 177         if (nr_rates) {
 178                 /*
 179                  * build the rate table and bitmap flags
 180                  */
 181                 int r, idx;
 182
 183                 fp->rate_table = kmalloc_array(nr_rates, sizeof(int),
 184                                                GFP_KERNEL);
 185                 if (fp->rate_table == NULL)
 186                         return -ENOMEM;
 187
 188                 fp->nr_rates = 0;
 189                 fp->rate_min = fp->rate_max = 0;
 190                 for (r = 0, idx = offset + 1; r < nr_rates; r++, idx += 3) {
 191                         unsigned int rate = combine_triple(&fmt[idx]);
 192                         if (!rate)
 193                                 continue;
 194                         /* C-Media CM6501 mislabels its 96 kHz altsetting */
 195                         /* Terratec Aureon 7.1 USB C-Media 6206, too */
 196                         if (rate == 48000 && nr_rates == 1 &&
 197                             (chip->usb_id == USB_ID(0x0d8c, 0x0201) ||
 198                              chip->usb_id == USB_ID(0x0d8c, 0x0102) ||
 199                              chip->usb_id == USB_ID(0x0ccd, 0x00b1)) &&
 200                             fp->altsetting == 5 && fp->maxpacksize == 392)
 201                                 rate = 96000;
 202                         /* Creative VF0420/VF0470 Live Cams report 16 kHz instead of 8kHz */
 203                         if (rate == 16000 &&
 204                             (chip->usb_id == USB_ID(0x041e, 0x4064) ||
 205                              chip->usb_id == USB_ID(0x041e, 0x4068)))
 206                                 rate = 8000;
 207
 208                         fp->rate_table[fp->nr_rates] = rate;
 209                         if (!fp->rate_min || rate < fp->rate_min)
 210                                 fp->rate_min = rate;
 211                         if (!fp->rate_max || rate > fp->rate_max)
 212                                 fp->rate_max = rate;
 213                         fp->rates |= snd_pcm_rate_to_rate_bit(rate);
 214                         fp->nr_rates++;
 215                 }
 216                 if (!fp->nr_rates) {
 217                         hwc_debug("All rates were zero. Skipping format!\n");
 218                         return -EINVAL;
 219                 }
 220         } else {
 221                 /* continuous rates */
 222                 fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
 223                 fp->rate_min = combine_triple(&fmt[offset + 1]);
 224                 fp->rate_max = combine_triple(&fmt[offset + 4]);
 225         }
 226         return 0;
 227 }
 228
 229 /*
 230  * Helper function to walk the array of sample rate triplets reported by
 231  * the device. The problem is that we need to parse whole array first to
 232  * get to know how many sample rates we have to expect.
 233  * Then fp->rate_table can be allocated and filled.
 234  */
 235 static int parse_uac2_sample_rate_range(struct snd_usb_audio *chip,
 236                                         struct audioformat *fp, int nr_triplets,
 237                                         const unsigned char *data)
 238 {
 239         int i, nr_rates = 0;
 240
 241         fp->rates = fp->rate_min = fp->rate_max = 0;
 242
 243         for (i = 0; i < nr_triplets; i++) {
 244                 int min = combine_quad(&data[2 + 12 * i]);
 245                 int max = combine_quad(&data[6 + 12 * i]);
 246                 int res = combine_quad(&data[10 + 12 * i]);
 247                 unsigned int rate;
 248
 249                 if ((max < 0) || (min < 0) || (res < 0) || (max < min))
 250                         continue;
 251
 252                 /*
 253                  * for ranges with res == 1, we announce a continuous sample
 254                  * rate range, and this function should return 0 for no further
 255                  * parsing.
 256                  */
 257                 if (res == 1) {
 258                         fp->rate_min = min;
 259                         fp->rate_max = max;
 260                         fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
 261                         return 0;
 262                 }
 263
 264                 for (rate = min; rate <= max; rate += res) {
 265                         if (fp->rate_table)
 266                                 fp->rate_table[nr_rates] = rate;
 267                         if (!fp->rate_min || rate < fp->rate_min)
 268                                 fp->rate_min = rate;
 269                         if (!fp->rate_max || rate > fp->rate_max)
 270                                 fp->rate_max = rate;
 271                         fp->rates |= snd_pcm_rate_to_rate_bit(rate);
 272
 273                         nr_rates++;
 274                         if (nr_rates >= MAX_NR_RATES) {
 275                                 usb_audio_err(chip, "invalid uac2 rates\n");
 276                                 break;
 277                         }
 278
 279                         /* avoid endless loop */
 280                         if (res == 0)
 281                                 break;
 282                 }
 283         }
 284
 285         return nr_rates;
 286 }
 287
 288 /* Line6 Helix series don't support the UAC2_CS_RANGE usb function
 289  * call. Return a static table of known clock rates.
 290  */
 291 static int line6_parse_audio_format_rates_quirk(struct snd_usb_audio *chip,
 292                                                 struct audioformat *fp)
 293 {
 294         switch (chip->usb_id) {
 295         case USB_ID(0x0E41, 0x4241): /* Line6 Helix */
 296         case USB_ID(0x0E41, 0x4242): /* Line6 Helix Rack */
 297         case USB_ID(0x0E41, 0x4244): /* Line6 Helix LT */
 298         case USB_ID(0x0E41, 0x4246): /* Line6 HX-Stomp */
 299                 /* supported rates: 48Khz */
 300                 kfree(fp->rate_table);
 301                 fp->rate_table = kmalloc(sizeof(int), GFP_KERNEL);
 302                 if (!fp->rate_table)
 303                         return -ENOMEM;
 304                 fp->nr_rates = 1;
 305                 fp->rate_min = 48000;
 306                 fp->rate_max = 48000;
 307                 fp->rates = SNDRV_PCM_RATE_48000;
 308                 fp->rate_table[0] = 48000;
 309                 return 0;
 310         }
 311
 312         return -ENODEV;
 313 }
 314
 315 /*
 316  * parse the format descriptor and stores the possible sample rates
 317  * on the audioformat table (audio class v2 and v3).
 318  */
 319 static int parse_audio_format_rates_v2v3(struct snd_usb_audio *chip,
 320                                        struct audioformat *fp)
 321 {
 322         struct usb_device *dev = chip->dev;
 323         unsigned char tmp[2], *data;
 324         int nr_triplets, data_size, ret = 0, ret_l6;
 325         int clock = snd_usb_clock_find_source(chip, fp->protocol,
 326                                               fp->clock, false);
 327
 328         if (clock < 0) {
 329                 dev_err(&dev->dev,
 330                         "%s(): unable to find clock source (clock %d)\n",
 331                                 __func__, clock);
 332                 goto err;
 333         }
 334
 335         /* get the number of sample rates first by only fetching 2 bytes */
 336         ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE,
 337                               USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
 338                               UAC2_CS_CONTROL_SAM_FREQ << 8,
 339                               snd_usb_ctrl_intf(chip) | (clock << 8),
 340                               tmp, sizeof(tmp));
 341
 342         if (ret < 0) {
 343                 /* line6 helix devices don't support UAC2_CS_CONTROL_SAM_FREQ call */
 344                 ret_l6 = line6_parse_audio_format_rates_quirk(chip, fp);
 345                 if (ret_l6 == -ENODEV) {
 346                         /* no line6 device found continue showing the error */
 347                         dev_err(&dev->dev,
 348                                 "%s(): unable to retrieve number of sample rates (clock %d)\n",
 349                                 __func__, clock);
 350                         goto err;
 351                 }
 352                 if (ret_l6 == 0) {
 353                         dev_info(&dev->dev,
 354                                 "%s(): unable to retrieve number of sample rates: set it to a predefined value (clock %d).\n",
 355                                 __func__, clock);
 356                         return 0;
 357                 }
 358                 ret = ret_l6;
 359                 goto err;
 360         }
 361
 362         nr_triplets = (tmp[1] << 8) | tmp[0];
 363         data_size = 2 + 12 * nr_triplets;
 364         data = kzalloc(data_size, GFP_KERNEL);
 365         if (!data) {
 366                 ret = -ENOMEM;
 367                 goto err;
 368         }
 369
 370         /* now get the full information */
 371         ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE,
 372                               USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
 373                               UAC2_CS_CONTROL_SAM_FREQ << 8,
 374                               snd_usb_ctrl_intf(chip) | (clock << 8),
 375                               data, data_size);
 376
 377         if (ret < 0) {
 378                 dev_err(&dev->dev,
 379                         "%s(): unable to retrieve sample rate range (clock %d)\n",
 380                                 __func__, clock);
 381                 ret = -EINVAL;
 382                 goto err_free;
 383         }
 384
 385         /* Call the triplet parser, and make sure fp->rate_table is NULL.
 386          * We just use the return value to know how many sample rates we
 387          * will have to deal with. */
 388         kfree(fp->rate_table);
 389         fp->rate_table = NULL;
 390         fp->nr_rates = parse_uac2_sample_rate_range(chip, fp, nr_triplets, data);
 391
 392         if (fp->nr_rates == 0) {
 393                 /* SNDRV_PCM_RATE_CONTINUOUS */
 394                 ret = 0;
 395                 goto err_free;
 396         }
 397
 398         fp->rate_table = kmalloc_array(fp->nr_rates, sizeof(int), GFP_KERNEL);
 399         if (!fp->rate_table) {
 400                 ret = -ENOMEM;
 401                 goto err_free;
 402         }
 403
 404         /* Call the triplet parser again, but this time, fp->rate_table is
 405          * allocated, so the rates will be stored */
 406         parse_uac2_sample_rate_range(chip, fp, nr_triplets, data);
 407
 408 err_free:
 409         kfree(data);
 410 err:
 411         return ret;
 412 }
 413
 414 /*
 415  * parse the format type I and III descriptors
 416  */
 417 static int parse_audio_format_i(struct snd_usb_audio *chip,
 418                                 struct audioformat *fp, u64 format,
 419                                 void *_fmt)
 420 {
 421         snd_pcm_format_t pcm_format;
 422         unsigned int fmt_type;
 423         int ret;
 424
 425         switch (fp->protocol) {
 426         default:
 427         case UAC_VERSION_1:
 428         case UAC_VERSION_2: {
 429                 struct uac_format_type_i_continuous_descriptor *fmt = _fmt;
 430
 431                 fmt_type = fmt->bFormatType;
 432                 break;
 433         }
 434         case UAC_VERSION_3: {
 435                 /* fp->fmt_type is already set in this case */
 436                 fmt_type = fp->fmt_type;
 437                 break;
 438         }
 439         }
 440
 441         if (fmt_type == UAC_FORMAT_TYPE_III) {
 442                 /* FIXME: the format type is really IECxxx
 443                  *        but we give normal PCM format to get the existing
 444                  *        apps working...
 445                  */
 446                 switch (chip->usb_id) {
 447
 448                 case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
 449                         if (chip->setup == 0x00 &&
 450                             fp->altsetting == 6)
 451                                 pcm_format = SNDRV_PCM_FORMAT_S16_BE;
 452                         else
 453                                 pcm_format = SNDRV_PCM_FORMAT_S16_LE;
 454                         break;
 455                 default:
 456                         pcm_format = SNDRV_PCM_FORMAT_S16_LE;
 457                 }
 458                 fp->formats = pcm_format_to_bits(pcm_format);
 459         } else {
 460                 fp->formats = parse_audio_format_i_type(chip, fp, format, _fmt);
 461                 if (!fp->formats)
 462                         return -EINVAL;
 463         }
 464
 465         /* gather possible sample rates */
 466         /* audio class v1 reports possible sample rates as part of the
 467          * proprietary class specific descriptor.
 468          * audio class v2 uses class specific EP0 range requests for that.
 469          */
 470         switch (fp->protocol) {
 471         default:
 472         case UAC_VERSION_1: {
 473                 struct uac_format_type_i_continuous_descriptor *fmt = _fmt;
 474
 475                 fp->channels = fmt->bNrChannels;
 476                 ret = parse_audio_format_rates_v1(chip, fp, (unsigned char *) fmt, 7);
 477                 break;
 478         }
 479         case UAC_VERSION_2:
 480         case UAC_VERSION_3: {
 481                 /* fp->channels is already set in this case */
 482                 ret = parse_audio_format_rates_v2v3(chip, fp);
 483                 break;
 484         }
 485         }
 486
 487         if (fp->channels < 1) {
 488                 usb_audio_err(chip,
 489                         "%u:%d : invalid channels %d\n",
 490                         fp->iface, fp->altsetting, fp->channels);
 491                 return -EINVAL;
 492         }
 493
 494         return ret;
 495 }
 496
 497 /*
 498  * parse the format type II descriptor
 499  */
 500 static int parse_audio_format_ii(struct snd_usb_audio *chip,
 501                                  struct audioformat *fp,
 502                                  u64 format, void *_fmt)
 503 {
 504         int brate, framesize, ret;
 505
 506         switch (format) {
 507         case UAC_FORMAT_TYPE_II_AC3:
 508                 /* FIXME: there is no AC3 format defined yet */
 509                 // fp->formats = SNDRV_PCM_FMTBIT_AC3;
 510                 fp->formats = SNDRV_PCM_FMTBIT_U8; /* temporary hack to receive byte streams */
 511                 break;
 512         case UAC_FORMAT_TYPE_II_MPEG:
 513                 fp->formats = SNDRV_PCM_FMTBIT_MPEG;
 514                 break;
 515         default:
 516                 usb_audio_info(chip,
 517                          "%u:%d : unknown format tag %#llx is detected.  processed as MPEG.\n",
 518                          fp->iface, fp->altsetting, format);
 519                 fp->formats = SNDRV_PCM_FMTBIT_MPEG;
 520                 break;
 521         }
 522
 523         fp->channels = 1;
 524
 525         switch (fp->protocol) {
 526         default:
 527         case UAC_VERSION_1: {
 528                 struct uac_format_type_ii_discrete_descriptor *fmt = _fmt;
 529                 brate = le16_to_cpu(fmt->wMaxBitRate);
 530                 framesize = le16_to_cpu(fmt->wSamplesPerFrame);
 531                 usb_audio_info(chip, "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize);
 532                 fp->frame_size = framesize;
 533                 ret = parse_audio_format_rates_v1(chip, fp, _fmt, 8); /* fmt[8..] sample rates */
 534                 break;
 535         }
 536         case UAC_VERSION_2: {
 537                 struct uac_format_type_ii_ext_descriptor *fmt = _fmt;
 538                 brate = le16_to_cpu(fmt->wMaxBitRate);
 539                 framesize = le16_to_cpu(fmt->wSamplesPerFrame);
 540                 usb_audio_info(chip, "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize);
 541                 fp->frame_size = framesize;
 542                 ret = parse_audio_format_rates_v2v3(chip, fp);
 543                 break;
 544         }
 545         }
 546
 547         return ret;
 548 }
 549
 550 int snd_usb_parse_audio_format(struct snd_usb_audio *chip,
 551                                struct audioformat *fp, u64 format,
 552                                struct uac_format_type_i_continuous_descriptor *fmt,
 553                                int stream)
 554 {
 555         int err;
 556
 557         switch (fmt->bFormatType) {
 558         case UAC_FORMAT_TYPE_I:
 559         case UAC_FORMAT_TYPE_III:
 560                 err = parse_audio_format_i(chip, fp, format, fmt);
 561                 break;
 562         case UAC_FORMAT_TYPE_II:
 563                 err = parse_audio_format_ii(chip, fp, format, fmt);
 564                 break;
 565         default:
 566                 usb_audio_info(chip,
 567                          "%u:%d : format type %d is not supported yet\n",
 568                          fp->iface, fp->altsetting,
 569                          fmt->bFormatType);
 570                 return -ENOTSUPP;
 571         }
 572         fp->fmt_type = fmt->bFormatType;
 573         if (err < 0)
 574                 return err;
 575 #if 1
 576         /* FIXME: temporary hack for extigy/audigy 2 nx/zs */
 577         /* extigy apparently supports sample rates other than 48k
 578          * but not in ordinary way.  so we enable only 48k atm.
 579          */
 580         if (chip->usb_id == USB_ID(0x041e, 0x3000) ||
 581             chip->usb_id == USB_ID(0x041e, 0x3020) ||
 582             chip->usb_id == USB_ID(0x041e, 0x3061)) {
 583                 if (fmt->bFormatType == UAC_FORMAT_TYPE_I &&
 584                     fp->rates != SNDRV_PCM_RATE_48000 &&
 585                     fp->rates != SNDRV_PCM_RATE_96000)
 586                         return -ENOTSUPP;
 587         }
 588 #endif
 589         return 0;
 590 }
 591
 592 int snd_usb_parse_audio_format_v3(struct snd_usb_audio *chip,
 593                                struct audioformat *fp,
 594                                struct uac3_as_header_descriptor *as,
 595                                int stream)
 596 {
 597         u64 format = le64_to_cpu(as->bmFormats);
 598         int err;
 599
 600         /*
 601          * Type I format bits are D0..D6
 602          * This test works because type IV is not supported
 603          */
 604         if (format & 0x7f)
 605                 fp->fmt_type = UAC_FORMAT_TYPE_I;
 606         else
 607                 fp->fmt_type = UAC_FORMAT_TYPE_III;
 608
 609         err = parse_audio_format_i(chip, fp, format, as);
 610         if (err < 0)
 611                 return err;
 612
 613         return 0;
 614 }