sound/usb/quirks.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 #include <linux/init.h>
  18 #include <linux/slab.h>
  19 #include <linux/usb.h>
  20 #include <linux/usb/audio.h>
  21
  22 #include <sound/core.h>
  23 #include <sound/info.h>
  24 #include <sound/pcm.h>
  25
  26 #include "usbaudio.h"
  27 #include "card.h"
  28 #include "mixer.h"
  29 #include "mixer_quirks.h"
  30 #include "midi.h"
  31 #include "quirks.h"
  32 #include "helper.h"
  33 #include "endpoint.h"
  34 #include "pcm.h"
  35
  36 /*
  37  * handle the quirks for the contained interfaces
  38  */
  39 static int create_composite_quirk(struct snd_usb_audio *chip,
  40                                   struct usb_interface *iface,
  41                                   struct usb_driver *driver,
  42                                   const struct snd_usb_audio_quirk *quirk)
  43 {
  44         int probed_ifnum = get_iface_desc(iface->altsetting)->bInterfaceNumber;
  45         int err;
  46
  47         for (quirk = quirk->data; quirk->ifnum >= 0; ++quirk) {
  48                 iface = usb_ifnum_to_if(chip->dev, quirk->ifnum);
  49                 if (!iface)
  50                         continue;
  51                 if (quirk->ifnum != probed_ifnum &&
  52                     usb_interface_claimed(iface))
  53                         continue;
  54                 err = snd_usb_create_quirk(chip, iface, driver, quirk);
  55                 if (err < 0)
  56                         return err;
  57                 if (quirk->ifnum != probed_ifnum)
  58                         usb_driver_claim_interface(driver, iface, (void *)-1L);
  59         }
  60         return 0;
  61 }
  62
  63 static int ignore_interface_quirk(struct snd_usb_audio *chip,
  64                                   struct usb_interface *iface,
  65                                   struct usb_driver *driver,
  66                                   const struct snd_usb_audio_quirk *quirk)
  67 {
  68         return 0;
  69 }
  70
  71
  72 /*
  73  * Allow alignment on audio sub-slot (channel samples) rather than
  74  * on audio slots (audio frames)
  75  */
  76 static int create_align_transfer_quirk(struct snd_usb_audio *chip,
  77                                        struct usb_interface *iface,
  78                                        struct usb_driver *driver,
  79                                        const struct snd_usb_audio_quirk *quirk)
  80 {
  81         chip->txfr_quirk = 1;
  82         return 1;       /* Continue with creating streams and mixer */
  83 }
  84
  85 static int create_any_midi_quirk(struct snd_usb_audio *chip,
  86                                  struct usb_interface *intf,
  87                                  struct usb_driver *driver,
  88                                  const struct snd_usb_audio_quirk *quirk)
  89 {
  90         return snd_usbmidi_create(chip->card, intf, &chip->midi_list, quirk);
  91 }
  92
  93 /*
  94  * create a stream for an interface with proper descriptors
  95  */
  96 static int create_standard_audio_quirk(struct snd_usb_audio *chip,
  97                                        struct usb_interface *iface,
  98                                        struct usb_driver *driver,
  99                                        const struct snd_usb_audio_quirk *quirk)
 100 {
 101         struct usb_host_interface *alts;
 102         struct usb_interface_descriptor *altsd;
 103         int err;
 104
 105         alts = &iface->altsetting[0];
 106         altsd = get_iface_desc(alts);
 107         err = snd_usb_parse_audio_endpoints(chip, altsd->bInterfaceNumber);
 108         if (err < 0) {
 109                 snd_printk(KERN_ERR "cannot setup if %d: error %d\n",
 110                            altsd->bInterfaceNumber, err);
 111                 return err;
 112         }
 113         /* reset the current interface */
 114         usb_set_interface(chip->dev, altsd->bInterfaceNumber, 0);
 115         return 0;
 116 }
 117
 118 /*
 119  * create a stream for an endpoint/altsetting without proper descriptors
 120  */
 121 static int create_fixed_stream_quirk(struct snd_usb_audio *chip,
 122                                      struct usb_interface *iface,
 123                                      struct usb_driver *driver,
 124                                      const struct snd_usb_audio_quirk *quirk)
 125 {
 126         struct audioformat *fp;
 127         struct usb_host_interface *alts;
 128         int stream, err;
 129         unsigned *rate_table = NULL;
 130
 131         fp = kmemdup(quirk->data, sizeof(*fp), GFP_KERNEL);
 132         if (! fp) {
 133                 snd_printk(KERN_ERR "cannot memdup\n");
 134                 return -ENOMEM;
 135         }
 136         if (fp->nr_rates > 0) {
 137                 rate_table = kmalloc(sizeof(int) * fp->nr_rates, GFP_KERNEL);
 138                 if (!rate_table) {
 139                         kfree(fp);
 140                         return -ENOMEM;
 141                 }
 142                 memcpy(rate_table, fp->rate_table, sizeof(int) * fp->nr_rates);
 143                 fp->rate_table = rate_table;
 144         }
 145
 146         stream = (fp->endpoint & USB_DIR_IN)
 147                 ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
 148         err = snd_usb_add_audio_endpoint(chip, stream, fp);
 149         if (err < 0) {
 150                 kfree(fp);
 151                 kfree(rate_table);
 152                 return err;
 153         }
 154         if (fp->iface != get_iface_desc(&iface->altsetting[0])->bInterfaceNumber ||
 155             fp->altset_idx >= iface->num_altsetting) {
 156                 kfree(fp);
 157                 kfree(rate_table);
 158                 return -EINVAL;
 159         }
 160         alts = &iface->altsetting[fp->altset_idx];
 161         fp->datainterval = snd_usb_parse_datainterval(chip, alts);
 162         fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
 163         usb_set_interface(chip->dev, fp->iface, 0);
 164         snd_usb_init_pitch(chip, fp->iface, alts, fp);
 165         snd_usb_init_sample_rate(chip, fp->iface, alts, fp, fp->rate_max);
 166         return 0;
 167 }
 168
 169 /*
 170  * Create a stream for an Edirol UA-700/UA-25/UA-4FX interface.
 171  * The only way to detect the sample rate is by looking at wMaxPacketSize.
 172  */
 173 static int create_uaxx_quirk(struct snd_usb_audio *chip,
 174                              struct usb_interface *iface,
 175                              struct usb_driver *driver,
 176                              const struct snd_usb_audio_quirk *quirk)
 177 {
 178         static const struct audioformat ua_format = {
 179                 .formats = SNDRV_PCM_FMTBIT_S24_3LE,
 180                 .channels = 2,
 181                 .fmt_type = UAC_FORMAT_TYPE_I,
 182                 .altsetting = 1,
 183                 .altset_idx = 1,
 184                 .rates = SNDRV_PCM_RATE_CONTINUOUS,
 185         };
 186         struct usb_host_interface *alts;
 187         struct usb_interface_descriptor *altsd;
 188         struct audioformat *fp;
 189         int stream, err;
 190
 191         /* both PCM and MIDI interfaces have 2 or more altsettings */
 192         if (iface->num_altsetting < 2)
 193                 return -ENXIO;
 194         alts = &iface->altsetting[1];
 195         altsd = get_iface_desc(alts);
 196
 197         if (altsd->bNumEndpoints == 2) {
 198                 static const struct snd_usb_midi_endpoint_info ua700_ep = {
 199                         .out_cables = 0x0003,
 200                         .in_cables  = 0x0003
 201                 };
 202                 static const struct snd_usb_audio_quirk ua700_quirk = {
 203                         .type = QUIRK_MIDI_FIXED_ENDPOINT,
 204                         .data = &ua700_ep
 205                 };
 206                 static const struct snd_usb_midi_endpoint_info uaxx_ep = {
 207                         .out_cables = 0x0001,
 208                         .in_cables  = 0x0001
 209                 };
 210                 static const struct snd_usb_audio_quirk uaxx_quirk = {
 211                         .type = QUIRK_MIDI_FIXED_ENDPOINT,
 212                         .data = &uaxx_ep
 213                 };
 214                 const struct snd_usb_audio_quirk *quirk =
 215                         chip->usb_id == USB_ID(0x0582, 0x002b)
 216                         ? &ua700_quirk : &uaxx_quirk;
 217                 return snd_usbmidi_create(chip->card, iface,
 218                                           &chip->midi_list, quirk);
 219         }
 220
 221         if (altsd->bNumEndpoints != 1)
 222                 return -ENXIO;
 223
 224         fp = kmalloc(sizeof(*fp), GFP_KERNEL);
 225         if (!fp)
 226                 return -ENOMEM;
 227         memcpy(fp, &ua_format, sizeof(*fp));
 228
 229         fp->iface = altsd->bInterfaceNumber;
 230         fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
 231         fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
 232         fp->datainterval = 0;
 233         fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
 234
 235         switch (fp->maxpacksize) {
 236         case 0x120:
 237                 fp->rate_max = fp->rate_min = 44100;
 238                 break;
 239         case 0x138:
 240         case 0x140:
 241                 fp->rate_max = fp->rate_min = 48000;
 242                 break;
 243         case 0x258:
 244         case 0x260:
 245                 fp->rate_max = fp->rate_min = 96000;
 246                 break;
 247         default:
 248                 snd_printk(KERN_ERR "unknown sample rate\n");
 249                 kfree(fp);
 250                 return -ENXIO;
 251         }
 252
 253         stream = (fp->endpoint & USB_DIR_IN)
 254                 ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
 255         err = snd_usb_add_audio_endpoint(chip, stream, fp);
 256         if (err < 0) {
 257                 kfree(fp);
 258                 return err;
 259         }
 260         usb_set_interface(chip->dev, fp->iface, 0);
 261         return 0;
 262 }
 263
 264 /*
 265  * audio-interface quirks
 266  *
 267  * returns zero if no standard audio/MIDI parsing is needed.
 268  * returns a postive value if standard audio/midi interfaces are parsed
 269  * after this.
 270  * returns a negative value at error.
 271  */
 272 int snd_usb_create_quirk(struct snd_usb_audio *chip,
 273                          struct usb_interface *iface,
 274                          struct usb_driver *driver,
 275                          const struct snd_usb_audio_quirk *quirk)
 276 {
 277         typedef int (*quirk_func_t)(struct snd_usb_audio *,
 278                                     struct usb_interface *,
 279                                     struct usb_driver *,
 280                                     const struct snd_usb_audio_quirk *);
 281         static const quirk_func_t quirk_funcs[] = {
 282                 [QUIRK_IGNORE_INTERFACE] = ignore_interface_quirk,
 283                 [QUIRK_COMPOSITE] = create_composite_quirk,
 284                 [QUIRK_MIDI_STANDARD_INTERFACE] = create_any_midi_quirk,
 285                 [QUIRK_MIDI_FIXED_ENDPOINT] = create_any_midi_quirk,
 286                 [QUIRK_MIDI_YAMAHA] = create_any_midi_quirk,
 287                 [QUIRK_MIDI_MIDIMAN] = create_any_midi_quirk,
 288                 [QUIRK_MIDI_NOVATION] = create_any_midi_quirk,
 289                 [QUIRK_MIDI_FASTLANE] = create_any_midi_quirk,
 290                 [QUIRK_MIDI_EMAGIC] = create_any_midi_quirk,
 291                 [QUIRK_MIDI_CME] = create_any_midi_quirk,
 292                 [QUIRK_AUDIO_STANDARD_INTERFACE] = create_standard_audio_quirk,
 293                 [QUIRK_AUDIO_FIXED_ENDPOINT] = create_fixed_stream_quirk,
 294                 [QUIRK_AUDIO_EDIROL_UAXX] = create_uaxx_quirk,
 295                 [QUIRK_AUDIO_ALIGN_TRANSFER] = create_align_transfer_quirk
 296         };
 297
 298         if (quirk->type < QUIRK_TYPE_COUNT) {
 299                 return quirk_funcs[quirk->type](chip, iface, driver, quirk);
 300         } else {
 301                 snd_printd(KERN_ERR "invalid quirk type %d\n", quirk->type);
 302                 return -ENXIO;
 303         }
 304 }
 305
 306 /*
 307  * boot quirks
 308  */
 309
 310 #define EXTIGY_FIRMWARE_SIZE_OLD 794
 311 #define EXTIGY_FIRMWARE_SIZE_NEW 483
 312
 313 static int snd_usb_extigy_boot_quirk(struct usb_device *dev, struct usb_interface *intf)
 314 {
 315         struct usb_host_config *config = dev->actconfig;
 316         int err;
 317
 318         if (le16_to_cpu(get_cfg_desc(config)->wTotalLength) == EXTIGY_FIRMWARE_SIZE_OLD ||
 319             le16_to_cpu(get_cfg_desc(config)->wTotalLength) == EXTIGY_FIRMWARE_SIZE_NEW) {
 320                 snd_printdd("sending Extigy boot sequence...\n");
 321                 /* Send message to force it to reconnect with full interface. */
 322                 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev,0),
 323                                       0x10, 0x43, 0x0001, 0x000a, NULL, 0, 1000);
 324                 if (err < 0) snd_printdd("error sending boot message: %d\n", err);
 325                 err = usb_get_descriptor(dev, USB_DT_DEVICE, 0,
 326                                 &dev->descriptor, sizeof(dev->descriptor));
 327                 config = dev->actconfig;
 328                 if (err < 0) snd_printdd("error usb_get_descriptor: %d\n", err);
 329                 err = usb_reset_configuration(dev);
 330                 if (err < 0) snd_printdd("error usb_reset_configuration: %d\n", err);
 331                 snd_printdd("extigy_boot: new boot length = %d\n",
 332                             le16_to_cpu(get_cfg_desc(config)->wTotalLength));
 333                 return -ENODEV; /* quit this anyway */
 334         }
 335         return 0;
 336 }
 337
 338 static int snd_usb_audigy2nx_boot_quirk(struct usb_device *dev)
 339 {
 340         u8 buf = 1;
 341
 342         snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), 0x2a,
 343                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
 344                         0, 0, &buf, 1, 1000);
 345         if (buf == 0) {
 346                 snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), 0x29,
 347                                 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_OTHER,
 348                                 1, 2000, NULL, 0, 1000);
 349                 return -ENODEV;
 350         }
 351         return 0;
 352 }
 353
 354 /*
 355  * C-Media CM106/CM106+ have four 16-bit internal registers that are nicely
 356  * documented in the device's data sheet.
 357  */
 358 static int snd_usb_cm106_write_int_reg(struct usb_device *dev, int reg, u16 value)
 359 {
 360         u8 buf[4];
 361         buf[0] = 0x20;
 362         buf[1] = value & 0xff;
 363         buf[2] = (value >> 8) & 0xff;
 364         buf[3] = reg;
 365         return snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), USB_REQ_SET_CONFIGURATION,
 366                                USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
 367                                0, 0, &buf, 4, 1000);
 368 }
 369
 370 static int snd_usb_cm106_boot_quirk(struct usb_device *dev)
 371 {
 372         /*
 373          * Enable line-out driver mode, set headphone source to front
 374          * channels, enable stereo mic.
 375          */
 376         return snd_usb_cm106_write_int_reg(dev, 2, 0x8004);
 377 }
 378
 379 /*
 380  * C-Media CM6206 is based on CM106 with two additional
 381  * registers that are not documented in the data sheet.
 382  * Values here are chosen based on sniffing USB traffic
 383  * under Windows.
 384  */
 385 static int snd_usb_cm6206_boot_quirk(struct usb_device *dev)
 386 {
 387         int err, reg;
 388         int val[] = {0x200c, 0x3000, 0xf800, 0x143f, 0x0000, 0x3000};
 389
 390         for (reg = 0; reg < ARRAY_SIZE(val); reg++) {
 391                 err = snd_usb_cm106_write_int_reg(dev, reg, val[reg]);
 392                 if (err < 0)
 393                         return err;
 394         }
 395
 396         return err;
 397 }
 398
 399 /*
 400  * This call will put the synth in "USB send" mode, i.e it will send MIDI
 401  * messages through USB (this is disabled at startup). The synth will
 402  * acknowledge by sending a sysex on endpoint 0x85 and by displaying a USB
 403  * sign on its LCD. Values here are chosen based on sniffing USB traffic
 404  * under Windows.
 405  */
 406 static int snd_usb_accessmusic_boot_quirk(struct usb_device *dev)
 407 {
 408         int err, actual_length;
 409
 410         /* "midi send" enable */
 411         static const u8 seq[] = { 0x4e, 0x73, 0x52, 0x01 };
 412
 413         void *buf = kmemdup(seq, ARRAY_SIZE(seq), GFP_KERNEL);
 414         if (!buf)
 415                 return -ENOMEM;
 416         err = usb_interrupt_msg(dev, usb_sndintpipe(dev, 0x05), buf,
 417                         ARRAY_SIZE(seq), &actual_length, 1000);
 418         kfree(buf);
 419         if (err < 0)
 420                 return err;
 421
 422         return 0;
 423 }
 424
 425 /*
 426  * Setup quirks
 427  */
 428 #define AUDIOPHILE_SET                  0x01 /* if set, parse device_setup */
 429 #define AUDIOPHILE_SET_DTS              0x02 /* if set, enable DTS Digital Output */
 430 #define AUDIOPHILE_SET_96K              0x04 /* 48-96KHz rate if set, 8-48KHz otherwise */
 431 #define AUDIOPHILE_SET_24B              0x08 /* 24bits sample if set, 16bits otherwise */
 432 #define AUDIOPHILE_SET_DI               0x10 /* if set, enable Digital Input */
 433 #define AUDIOPHILE_SET_MASK             0x1F /* bit mask for setup value */
 434 #define AUDIOPHILE_SET_24B_48K_DI       0x19 /* value for 24bits+48KHz+Digital Input */
 435 #define AUDIOPHILE_SET_24B_48K_NOTDI    0x09 /* value for 24bits+48KHz+No Digital Input */
 436 #define AUDIOPHILE_SET_16B_48K_DI       0x11 /* value for 16bits+48KHz+Digital Input */
 437 #define AUDIOPHILE_SET_16B_48K_NOTDI    0x01 /* value for 16bits+48KHz+No Digital Input */
 438
 439 static int audiophile_skip_setting_quirk(struct snd_usb_audio *chip,
 440                                          int iface,
 441                                          int altno)
 442 {
 443         /* Reset ALL ifaces to 0 altsetting.
 444          * Call it for every possible altsetting of every interface.
 445          */
 446         usb_set_interface(chip->dev, iface, 0);
 447
 448         if (chip->setup & AUDIOPHILE_SET) {
 449                 if ((chip->setup & AUDIOPHILE_SET_DTS)
 450                     && altno != 6)
 451                         return 1; /* skip this altsetting */
 452                 if ((chip->setup & AUDIOPHILE_SET_96K)
 453                     && altno != 1)
 454                         return 1; /* skip this altsetting */
 455                 if ((chip->setup & AUDIOPHILE_SET_MASK) ==
 456                     AUDIOPHILE_SET_24B_48K_DI && altno != 2)
 457                         return 1; /* skip this altsetting */
 458                 if ((chip->setup & AUDIOPHILE_SET_MASK) ==
 459                     AUDIOPHILE_SET_24B_48K_NOTDI && altno != 3)
 460                         return 1; /* skip this altsetting */
 461                 if ((chip->setup & AUDIOPHILE_SET_MASK) ==
 462                     AUDIOPHILE_SET_16B_48K_DI && altno != 4)
 463                         return 1; /* skip this altsetting */
 464                 if ((chip->setup & AUDIOPHILE_SET_MASK) ==
 465                     AUDIOPHILE_SET_16B_48K_NOTDI && altno != 5)
 466                         return 1; /* skip this altsetting */
 467         }
 468
 469         return 0; /* keep this altsetting */
 470 }
 471
 472 int snd_usb_apply_interface_quirk(struct snd_usb_audio *chip,
 473                                   int iface,
 474                                   int altno)
 475 {
 476         /* audiophile usb: skip altsets incompatible with device_setup */
 477         if (chip->usb_id == USB_ID(0x0763, 0x2003))
 478                 return audiophile_skip_setting_quirk(chip, iface, altno);
 479
 480         return 0;
 481 }
 482
 483 int snd_usb_apply_boot_quirk(struct usb_device *dev,
 484                              struct usb_interface *intf,
 485                              const struct snd_usb_audio_quirk *quirk)
 486 {
 487         u32 id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
 488                         le16_to_cpu(dev->descriptor.idProduct));
 489
 490         /* SB Extigy needs special boot-up sequence */
 491         /* if more models come, this will go to the quirk list. */
 492         if (id == USB_ID(0x041e, 0x3000))
 493                 return snd_usb_extigy_boot_quirk(dev, intf);
 494
 495         /* SB Audigy 2 NX needs its own boot-up magic, too */
 496         if (id == USB_ID(0x041e, 0x3020))
 497                 return snd_usb_audigy2nx_boot_quirk(dev);
 498
 499         /* C-Media CM106 / Turtle Beach Audio Advantage Roadie */
 500         if (id == USB_ID(0x10f5, 0x0200))
 501                 return snd_usb_cm106_boot_quirk(dev);
 502
 503         /* C-Media CM6206 / CM106-Like Sound Device */
 504         if (id == USB_ID(0x0d8c, 0x0102))
 505                 return snd_usb_cm6206_boot_quirk(dev);
 506
 507         /* Access Music VirusTI Desktop */
 508         if (id == USB_ID(0x133e, 0x0815))
 509                 return snd_usb_accessmusic_boot_quirk(dev);
 510
 511         return 0;
 512 }
 513
 514 /*
 515  * check if the device uses big-endian samples
 516  */
 517 int snd_usb_is_big_endian_format(struct snd_usb_audio *chip, struct audioformat *fp)
 518 {
 519         switch (chip->usb_id) {
 520         case USB_ID(0x0763, 0x2001): /* M-Audio Quattro: captured data only */
 521                 if (fp->endpoint & USB_DIR_IN)
 522                         return 1;
 523                 break;
 524         case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
 525                 if (chip->setup == 0x00 ||
 526                     fp->altsetting==1 || fp->altsetting==2 || fp->altsetting==3)
 527                         return 1;
 528         }
 529         return 0;
 530 }
 531
 532 /*
 533  * For E-Mu 0404USB/0202USB/TrackerPre sample rate should be set for device,
 534  * not for interface.
 535  */
 536
 537 enum {
 538         EMU_QUIRK_SR_44100HZ = 0,
 539         EMU_QUIRK_SR_48000HZ,
 540         EMU_QUIRK_SR_88200HZ,
 541         EMU_QUIRK_SR_96000HZ,
 542         EMU_QUIRK_SR_176400HZ,
 543         EMU_QUIRK_SR_192000HZ
 544 };
 545
 546 static void set_format_emu_quirk(struct snd_usb_substream *subs,
 547                                  struct audioformat *fmt)
 548 {
 549         unsigned char emu_samplerate_id = 0;
 550
 551         /* When capture is active
 552          * sample rate shouldn't be changed
 553          * by playback substream
 554          */
 555         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) {
 556                 if (subs->stream->substream[SNDRV_PCM_STREAM_CAPTURE].interface != -1)
 557                         return;
 558         }
 559
 560         switch (fmt->rate_min) {
 561         case 48000:
 562                 emu_samplerate_id = EMU_QUIRK_SR_48000HZ;
 563                 break;
 564         case 88200:
 565                 emu_samplerate_id = EMU_QUIRK_SR_88200HZ;
 566                 break;
 567         case 96000:
 568                 emu_samplerate_id = EMU_QUIRK_SR_96000HZ;
 569                 break;
 570         case 176400:
 571                 emu_samplerate_id = EMU_QUIRK_SR_176400HZ;
 572                 break;
 573         case 192000:
 574                 emu_samplerate_id = EMU_QUIRK_SR_192000HZ;
 575                 break;
 576         default:
 577                 emu_samplerate_id = EMU_QUIRK_SR_44100HZ;
 578                 break;
 579         }
 580         snd_emuusb_set_samplerate(subs->stream->chip, emu_samplerate_id);
 581 }
 582
 583 void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
 584                               struct audioformat *fmt)
 585 {
 586         switch (subs->stream->chip->usb_id) {
 587         case USB_ID(0x041e, 0x3f02): /* E-Mu 0202 USB */
 588         case USB_ID(0x041e, 0x3f04): /* E-Mu 0404 USB */
 589         case USB_ID(0x041e, 0x3f0a): /* E-Mu Tracker Pre */
 590                 set_format_emu_quirk(subs, fmt);
 591                 break;
 592         }
 593 }
 594