sound/usb/format.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
  24 #include <sound/core.h>
  25 #include <sound/pcm.h>
  26
  27 #include "usbaudio.h"
  28 #include "card.h"
  29 #include "quirks.h"
  30 #include "helper.h"
  31 #include "debug.h"
  32 #include "clock.h"
  33
  34 /*
  35  * parse the audio format type I descriptor
  36  * and returns the corresponding pcm format
  37  *
  38  * @dev: usb device
  39  * @fp: audioformat record
  40  * @format: the format tag (wFormatTag)
  41  * @fmt: the format type descriptor
  42  */
  43 static u64 parse_audio_format_i_type(struct snd_usb_audio *chip,
  44                                      struct audioformat *fp,
  45                                      int format, void *_fmt,
  46                                      int protocol)
  47 {
  48         int sample_width, sample_bytes;
  49         u64 pcm_formats;
  50
  51         switch (protocol) {
  52         case UAC_VERSION_1:
  53         default: {
  54                 struct uac_format_type_i_discrete_descriptor *fmt = _fmt;
  55                 sample_width = fmt->bBitResolution;
  56                 sample_bytes = fmt->bSubframeSize;
  57                 format = 1 << format;
  58                 break;
  59         }
  60
  61         case UAC_VERSION_2: {
  62                 struct uac_format_type_i_ext_descriptor *fmt = _fmt;
  63                 sample_width = fmt->bBitResolution;
  64                 sample_bytes = fmt->bSubslotSize;
  65                 format <<= 1;
  66                 break;
  67         }
  68         }
  69
  70         pcm_formats = 0;
  71
  72         if (format == 0 || format == (1 << UAC_FORMAT_TYPE_I_UNDEFINED)) {
  73                 /* some devices don't define this correctly... */
  74                 snd_printdd(KERN_INFO "%d:%u:%d : format type 0 is detected, processed as PCM\n",
  75                             chip->dev->devnum, fp->iface, fp->altsetting);
  76                 format = 1 << UAC_FORMAT_TYPE_I_PCM;
  77         }
  78         if (format & (1 << UAC_FORMAT_TYPE_I_PCM)) {
  79                 if (chip->usb_id == USB_ID(0x0582, 0x0016) /* Edirol SD-90 */ &&
  80                     sample_width == 24 && sample_bytes == 2)
  81                         sample_bytes = 3;
  82                 else if (sample_width > sample_bytes * 8) {
  83                         snd_printk(KERN_INFO "%d:%u:%d : sample bitwidth %d in over sample bytes %d\n",
  84                                    chip->dev->devnum, fp->iface, fp->altsetting,
  85                                    sample_width, sample_bytes);
  86                 }
  87                 /* check the format byte size */
  88                 switch (sample_bytes) {
  89                 case 1:
  90                         pcm_formats |= SNDRV_PCM_FMTBIT_S8;
  91                         break;
  92                 case 2:
  93                         if (snd_usb_is_big_endian_format(chip, fp))
  94                                 pcm_formats |= SNDRV_PCM_FMTBIT_S16_BE; /* grrr, big endian!! */
  95                         else
  96                                 pcm_formats |= SNDRV_PCM_FMTBIT_S16_LE;
  97                         break;
  98                 case 3:
  99                         if (snd_usb_is_big_endian_format(chip, fp))
 100                                 pcm_formats |= SNDRV_PCM_FMTBIT_S24_3BE; /* grrr, big endian!! */
 101                         else
 102                                 pcm_formats |= SNDRV_PCM_FMTBIT_S24_3LE;
 103                         break;
 104                 case 4:
 105                         pcm_formats |= SNDRV_PCM_FMTBIT_S32_LE;
 106                         break;
 107                 default:
 108                         snd_printk(KERN_INFO "%d:%u:%d : unsupported sample bitwidth %d in %d bytes\n",
 109                                    chip->dev->devnum, fp->iface, fp->altsetting,
 110                                    sample_width, sample_bytes);
 111                         break;
 112                 }
 113         }
 114         if (format & (1 << UAC_FORMAT_TYPE_I_PCM8)) {
 115                 /* Dallas DS4201 workaround: it advertises U8 format, but really
 116                    supports S8. */
 117                 if (chip->usb_id == USB_ID(0x04fa, 0x4201))
 118                         pcm_formats |= SNDRV_PCM_FMTBIT_S8;
 119                 else
 120                         pcm_formats |= SNDRV_PCM_FMTBIT_U8;
 121         }
 122         if (format & (1 << UAC_FORMAT_TYPE_I_IEEE_FLOAT)) {
 123                 pcm_formats |= SNDRV_PCM_FMTBIT_FLOAT_LE;
 124         }
 125         if (format & (1 << UAC_FORMAT_TYPE_I_ALAW)) {
 126                 pcm_formats |= SNDRV_PCM_FMTBIT_A_LAW;
 127         }
 128         if (format & (1 << UAC_FORMAT_TYPE_I_MULAW)) {
 129                 pcm_formats |= SNDRV_PCM_FMTBIT_MU_LAW;
 130         }
 131         if (format & ~0x3f) {
 132                 snd_printk(KERN_INFO "%d:%u:%d : unsupported format bits %#x\n",
 133                            chip->dev->devnum, fp->iface, fp->altsetting, format);
 134         }
 135         return pcm_formats;
 136 }
 137
 138
 139 /*
 140  * parse the format descriptor and stores the possible sample rates
 141  * on the audioformat table (audio class v1).
 142  *
 143  * @dev: usb device
 144  * @fp: audioformat record
 145  * @fmt: the format descriptor
 146  * @offset: the start offset of descriptor pointing the rate type
 147  *          (7 for type I and II, 8 for type II)
 148  */
 149 static int parse_audio_format_rates_v1(struct snd_usb_audio *chip, struct audioformat *fp,
 150                                        unsigned char *fmt, int offset)
 151 {
 152         int nr_rates = fmt[offset];
 153
 154         if (fmt[0] < offset + 1 + 3 * (nr_rates ? nr_rates : 2)) {
 155                 snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_FORMAT_TYPE desc\n",
 156                                    chip->dev->devnum, fp->iface, fp->altsetting);
 157                 return -1;
 158         }
 159
 160         if (nr_rates) {
 161                 /*
 162                  * build the rate table and bitmap flags
 163                  */
 164                 int r, idx;
 165
 166                 fp->rate_table = kmalloc(sizeof(int) * nr_rates, GFP_KERNEL);
 167                 if (fp->rate_table == NULL) {
 168                         snd_printk(KERN_ERR "cannot malloc\n");
 169                         return -1;
 170                 }
 171
 172                 fp->nr_rates = 0;
 173                 fp->rate_min = fp->rate_max = 0;
 174                 for (r = 0, idx = offset + 1; r < nr_rates; r++, idx += 3) {
 175                         unsigned int rate = combine_triple(&fmt[idx]);
 176                         if (!rate)
 177                                 continue;
 178                         /* C-Media CM6501 mislabels its 96 kHz altsetting */
 179                         if (rate == 48000 && nr_rates == 1 &&
 180                             (chip->usb_id == USB_ID(0x0d8c, 0x0201) ||
 181                              chip->usb_id == USB_ID(0x0d8c, 0x0102)) &&
 182                             fp->altsetting == 5 && fp->maxpacksize == 392)
 183                                 rate = 96000;
 184                         /* Creative VF0470 Live Cam reports 16 kHz instead of 8kHz */
 185                         if (rate == 16000 && chip->usb_id == USB_ID(0x041e, 0x4068))
 186                                 rate = 8000;
 187
 188                         fp->rate_table[fp->nr_rates] = rate;
 189                         if (!fp->rate_min || rate < fp->rate_min)
 190                                 fp->rate_min = rate;
 191                         if (!fp->rate_max || rate > fp->rate_max)
 192                                 fp->rate_max = rate;
 193                         fp->rates |= snd_pcm_rate_to_rate_bit(rate);
 194                         fp->nr_rates++;
 195                 }
 196                 if (!fp->nr_rates) {
 197                         hwc_debug("All rates were zero. Skipping format!\n");
 198                         return -1;
 199                 }
 200         } else {
 201                 /* continuous rates */
 202                 fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
 203                 fp->rate_min = combine_triple(&fmt[offset + 1]);
 204                 fp->rate_max = combine_triple(&fmt[offset + 4]);
 205         }
 206         return 0;
 207 }
 208
 209 /*
 210  * Helper function to walk the array of sample rate triplets reported by
 211  * the device. The problem is that we need to parse whole array first to
 212  * get to know how many sample rates we have to expect.
 213  * Then fp->rate_table can be allocated and filled.
 214  */
 215 static int parse_uac2_sample_rate_range(struct audioformat *fp, int nr_triplets,
 216                                         const unsigned char *data)
 217 {
 218         int i, nr_rates = 0;
 219
 220         fp->rates = fp->rate_min = fp->rate_max = 0;
 221
 222         for (i = 0; i < nr_triplets; i++) {
 223                 int min = combine_quad(&data[2 + 12 * i]);
 224                 int max = combine_quad(&data[6 + 12 * i]);
 225                 int res = combine_quad(&data[10 + 12 * i]);
 226                 int rate;
 227
 228                 if ((max < 0) || (min < 0) || (res < 0) || (max < min))
 229                         continue;
 230
 231                 /*
 232                  * for ranges with res == 1, we announce a continuous sample
 233                  * rate range, and this function should return 0 for no further
 234                  * parsing.
 235                  */
 236                 if (res == 1) {
 237                         fp->rate_min = min;
 238                         fp->rate_max = max;
 239                         fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
 240                         return 0;
 241                 }
 242
 243                 for (rate = min; rate <= max; rate += res) {
 244                         if (fp->rate_table)
 245                                 fp->rate_table[nr_rates] = rate;
 246                         if (!fp->rate_min || rate < fp->rate_min)
 247                                 fp->rate_min = rate;
 248                         if (!fp->rate_max || rate > fp->rate_max)
 249                                 fp->rate_max = rate;
 250                         fp->rates |= snd_pcm_rate_to_rate_bit(rate);
 251
 252                         nr_rates++;
 253
 254                         /* avoid endless loop */
 255                         if (res == 0)
 256                                 break;
 257                 }
 258         }
 259
 260         return nr_rates;
 261 }
 262
 263 /*
 264  * parse the format descriptor and stores the possible sample rates
 265  * on the audioformat table (audio class v2).
 266  */
 267 static int parse_audio_format_rates_v2(struct snd_usb_audio *chip,
 268                                        struct audioformat *fp)
 269 {
 270         struct usb_device *dev = chip->dev;
 271         unsigned char tmp[2], *data;
 272         int nr_triplets, data_size, ret = 0;
 273         int clock = snd_usb_clock_find_source(chip, fp->clock);
 274
 275         if (clock < 0) {
 276                 snd_printk(KERN_ERR "%s(): unable to find clock source (clock %d)\n",
 277                                 __func__, clock);
 278                 goto err;
 279         }
 280
 281         /* get the number of sample rates first by only fetching 2 bytes */
 282         ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE,
 283                               USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
 284                               UAC2_CS_CONTROL_SAM_FREQ << 8,
 285                               snd_usb_ctrl_intf(chip) | (clock << 8),
 286                               tmp, sizeof(tmp), 1000);
 287
 288         if (ret < 0) {
 289                 snd_printk(KERN_ERR "%s(): unable to retrieve number of sample rates (clock %d)\n",
 290                                 __func__, clock);
 291                 goto err;
 292         }
 293
 294         nr_triplets = (tmp[1] << 8) | tmp[0];
 295         data_size = 2 + 12 * nr_triplets;
 296         data = kzalloc(data_size, GFP_KERNEL);
 297         if (!data) {
 298                 ret = -ENOMEM;
 299                 goto err;
 300         }
 301
 302         /* now get the full information */
 303         ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE,
 304                               USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
 305                               UAC2_CS_CONTROL_SAM_FREQ << 8,
 306                               snd_usb_ctrl_intf(chip) | (clock << 8),
 307                               data, data_size, 1000);
 308
 309         if (ret < 0) {
 310                 snd_printk(KERN_ERR "%s(): unable to retrieve sample rate range (clock %d)\n",
 311                                 __func__, clock);
 312                 ret = -EINVAL;
 313                 goto err_free;
 314         }
 315
 316         /* Call the triplet parser, and make sure fp->rate_table is NULL.
 317          * We just use the return value to know how many sample rates we
 318          * will have to deal with. */
 319         kfree(fp->rate_table);
 320         fp->rate_table = NULL;
 321         fp->nr_rates = parse_uac2_sample_rate_range(fp, nr_triplets, data);
 322
 323         if (fp->nr_rates == 0) {
 324                 /* SNDRV_PCM_RATE_CONTINUOUS */
 325                 ret = 0;
 326                 goto err_free;
 327         }
 328
 329         fp->rate_table = kmalloc(sizeof(int) * fp->nr_rates, GFP_KERNEL);
 330         if (!fp->rate_table) {
 331                 ret = -ENOMEM;
 332                 goto err_free;
 333         }
 334
 335         /* Call the triplet parser again, but this time, fp->rate_table is
 336          * allocated, so the rates will be stored */
 337         parse_uac2_sample_rate_range(fp, nr_triplets, data);
 338
 339 err_free:
 340         kfree(data);
 341 err:
 342         return ret;
 343 }
 344
 345 /*
 346  * parse the format type I and III descriptors
 347  */
 348 static int parse_audio_format_i(struct snd_usb_audio *chip,
 349                                 struct audioformat *fp, int format,
 350                                 struct uac_format_type_i_continuous_descriptor *fmt,
 351                                 struct usb_host_interface *iface)
 352 {
 353         struct usb_interface_descriptor *altsd = get_iface_desc(iface);
 354         int protocol = altsd->bInterfaceProtocol;
 355         int pcm_format, ret;
 356
 357         if (fmt->bFormatType == UAC_FORMAT_TYPE_III) {
 358                 /* FIXME: the format type is really IECxxx
 359                  *        but we give normal PCM format to get the existing
 360                  *        apps working...
 361                  */
 362                 switch (chip->usb_id) {
 363
 364                 case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
 365                         if (chip->setup == 0x00 &&
 366                             fp->altsetting == 6)
 367                                 pcm_format = SNDRV_PCM_FORMAT_S16_BE;
 368                         else
 369                                 pcm_format = SNDRV_PCM_FORMAT_S16_LE;
 370                         break;
 371                 default:
 372                         pcm_format = SNDRV_PCM_FORMAT_S16_LE;
 373                 }
 374                 fp->formats = 1uLL << pcm_format;
 375         } else {
 376                 fp->formats = parse_audio_format_i_type(chip, fp, format,
 377                                                         fmt, protocol);
 378                 if (!fp->formats)
 379                         return -1;
 380         }
 381
 382         /* gather possible sample rates */
 383         /* audio class v1 reports possible sample rates as part of the
 384          * proprietary class specific descriptor.
 385          * audio class v2 uses class specific EP0 range requests for that.
 386          */
 387         switch (protocol) {
 388         default:
 389                 snd_printdd(KERN_WARNING "%d:%u:%d : invalid protocol version %d, assuming v1\n",
 390                            chip->dev->devnum, fp->iface, fp->altsetting, protocol);
 391                 /* fall through */
 392         case UAC_VERSION_1:
 393                 fp->channels = fmt->bNrChannels;
 394                 ret = parse_audio_format_rates_v1(chip, fp, (unsigned char *) fmt, 7);
 395                 break;
 396         case UAC_VERSION_2:
 397                 /* fp->channels is already set in this case */
 398                 ret = parse_audio_format_rates_v2(chip, fp);
 399                 break;
 400         }
 401
 402         if (fp->channels < 1) {
 403                 snd_printk(KERN_ERR "%d:%u:%d : invalid channels %d\n",
 404                            chip->dev->devnum, fp->iface, fp->altsetting, fp->channels);
 405                 return -1;
 406         }
 407
 408         return ret;
 409 }
 410
 411 /*
 412  * parse the format type II descriptor
 413  */
 414 static int parse_audio_format_ii(struct snd_usb_audio *chip,
 415                                  struct audioformat *fp,
 416                                  int format, void *_fmt,
 417                                  struct usb_host_interface *iface)
 418 {
 419         int brate, framesize, ret;
 420         struct usb_interface_descriptor *altsd = get_iface_desc(iface);
 421         int protocol = altsd->bInterfaceProtocol;
 422
 423         switch (format) {
 424         case UAC_FORMAT_TYPE_II_AC3:
 425                 /* FIXME: there is no AC3 format defined yet */
 426                 // fp->formats = SNDRV_PCM_FMTBIT_AC3;
 427                 fp->formats = SNDRV_PCM_FMTBIT_U8; /* temporary hack to receive byte streams */
 428                 break;
 429         case UAC_FORMAT_TYPE_II_MPEG:
 430                 fp->formats = SNDRV_PCM_FMTBIT_MPEG;
 431                 break;
 432         default:
 433                 snd_printd(KERN_INFO "%d:%u:%d : unknown format tag %#x is detected.  processed as MPEG.\n",
 434                            chip->dev->devnum, fp->iface, fp->altsetting, format);
 435                 fp->formats = SNDRV_PCM_FMTBIT_MPEG;
 436                 break;
 437         }
 438
 439         fp->channels = 1;
 440
 441         switch (protocol) {
 442         default:
 443                 snd_printdd(KERN_WARNING "%d:%u:%d : invalid protocol version %d, assuming v1\n",
 444                            chip->dev->devnum, fp->iface, fp->altsetting, protocol);
 445                 /* fall through */
 446         case UAC_VERSION_1: {
 447                 struct uac_format_type_ii_discrete_descriptor *fmt = _fmt;
 448                 brate = le16_to_cpu(fmt->wMaxBitRate);
 449                 framesize = le16_to_cpu(fmt->wSamplesPerFrame);
 450                 snd_printd(KERN_INFO "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize);
 451                 fp->frame_size = framesize;
 452                 ret = parse_audio_format_rates_v1(chip, fp, _fmt, 8); /* fmt[8..] sample rates */
 453                 break;
 454         }
 455         case UAC_VERSION_2: {
 456                 struct uac_format_type_ii_ext_descriptor *fmt = _fmt;
 457                 brate = le16_to_cpu(fmt->wMaxBitRate);
 458                 framesize = le16_to_cpu(fmt->wSamplesPerFrame);
 459                 snd_printd(KERN_INFO "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize);
 460                 fp->frame_size = framesize;
 461                 ret = parse_audio_format_rates_v2(chip, fp);
 462                 break;
 463         }
 464         }
 465
 466         return ret;
 467 }
 468
 469 int snd_usb_parse_audio_format(struct snd_usb_audio *chip, struct audioformat *fp,
 470                                int format, struct uac_format_type_i_continuous_descriptor *fmt,
 471                                int stream, struct usb_host_interface *iface)
 472 {
 473         int err;
 474
 475         switch (fmt->bFormatType) {
 476         case UAC_FORMAT_TYPE_I:
 477         case UAC_FORMAT_TYPE_III:
 478                 err = parse_audio_format_i(chip, fp, format, fmt, iface);
 479                 break;
 480         case UAC_FORMAT_TYPE_II:
 481                 err = parse_audio_format_ii(chip, fp, format, fmt, iface);
 482                 break;
 483         default:
 484                 snd_printd(KERN_INFO "%d:%u:%d : format type %d is not supported yet\n",
 485                            chip->dev->devnum, fp->iface, fp->altsetting,
 486                            fmt->bFormatType);
 487                 return -ENOTSUPP;
 488         }
 489         fp->fmt_type = fmt->bFormatType;
 490         if (err < 0)
 491                 return err;
 492 #if 1
 493         /* FIXME: temporary hack for extigy/audigy 2 nx/zs */
 494         /* extigy apparently supports sample rates other than 48k
 495          * but not in ordinary way.  so we enable only 48k atm.
 496          */
 497         if (chip->usb_id == USB_ID(0x041e, 0x3000) ||
 498             chip->usb_id == USB_ID(0x041e, 0x3020) ||
 499             chip->usb_id == USB_ID(0x041e, 0x3061)) {
 500                 if (fmt->bFormatType == UAC_FORMAT_TYPE_I &&
 501                     fp->rates != SNDRV_PCM_RATE_48000 &&
 502                     fp->rates != SNDRV_PCM_RATE_96000)
 503                         return -ENOTSUPP;
 504         }
 505 #endif
 506         return 0;
 507 }
 508