release/src-rt-6.x.4708/linux/linux-2.6.36/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 #include "clock.h"
  36
  37 /*
  38  * handle the quirks for the contained interfaces
  39  */
  40 static int create_composite_quirk(struct snd_usb_audio *chip,
  41                                   struct usb_interface *iface,
  42                                   struct usb_driver *driver,
  43                                   const struct snd_usb_audio_quirk *quirk)
  44 {
  45         int probed_ifnum = get_iface_desc(iface->altsetting)->bInterfaceNumber;
  46         int err;
  47
  48         for (quirk = quirk->data; quirk->ifnum >= 0; ++quirk) {
  49                 iface = usb_ifnum_to_if(chip->dev, quirk->ifnum);
  50                 if (!iface)
  51                         continue;
  52                 if (quirk->ifnum != probed_ifnum &&
  53                     usb_interface_claimed(iface))
  54                         continue;
  55                 err = snd_usb_create_quirk(chip, iface, driver, quirk);
  56                 if (err < 0)
  57                         return err;
  58                 if (quirk->ifnum != probed_ifnum)
  59                         usb_driver_claim_interface(driver, iface, (void *)-1L);
  60         }
  61         return 0;
  62 }
  63
  64 static int ignore_interface_quirk(struct snd_usb_audio *chip,
  65                                   struct usb_interface *iface,
  66                                   struct usb_driver *driver,
  67                                   const struct snd_usb_audio_quirk *quirk)
  68 {
  69         return 0;
  70 }
  71
  72
  73 /*
  74  * Allow alignment on audio sub-slot (channel samples) rather than
  75  * on audio slots (audio frames)
  76  */
  77 static int create_align_transfer_quirk(struct snd_usb_audio *chip,
  78                                        struct usb_interface *iface,
  79                                        struct usb_driver *driver,
  80                                        const struct snd_usb_audio_quirk *quirk)
  81 {
  82         chip->txfr_quirk = 1;
  83         return 1;       /* Continue with creating streams and mixer */
  84 }
  85
  86 static int create_any_midi_quirk(struct snd_usb_audio *chip,
  87                                  struct usb_interface *intf,
  88                                  struct usb_driver *driver,
  89                                  const struct snd_usb_audio_quirk *quirk)
  90 {
  91         return snd_usbmidi_create(chip->card, intf, &chip->midi_list, quirk);
  92 }
  93
  94 /*
  95  * create a stream for an interface with proper descriptors
  96  */
  97 static int create_standard_audio_quirk(struct snd_usb_audio *chip,
  98                                        struct usb_interface *iface,
  99                                        struct usb_driver *driver,
 100                                        const struct snd_usb_audio_quirk *quirk)
 101 {
 102         struct usb_host_interface *alts;
 103         struct usb_interface_descriptor *altsd;
 104         int err;
 105
 106         alts = &iface->altsetting[0];
 107         altsd = get_iface_desc(alts);
 108         err = snd_usb_parse_audio_endpoints(chip, altsd->bInterfaceNumber);
 109         if (err < 0) {
 110                 snd_printk(KERN_ERR "cannot setup if %d: error %d\n",
 111                            altsd->bInterfaceNumber, err);
 112                 return err;
 113         }
 114         /* reset the current interface */
 115         usb_set_interface(chip->dev, altsd->bInterfaceNumber, 0);
 116         return 0;
 117 }
 118
 119 /*
 120  * create a stream for an endpoint/altsetting without proper descriptors
 121  */
 122 static int create_fixed_stream_quirk(struct snd_usb_audio *chip,
 123                                      struct usb_interface *iface,
 124                                      struct usb_driver *driver,
 125                                      const struct snd_usb_audio_quirk *quirk)
 126 {
 127         struct audioformat *fp;
 128         struct usb_host_interface *alts;
 129         int stream, err;
 130         unsigned *rate_table = NULL;
 131
 132         fp = kmemdup(quirk->data, sizeof(*fp), GFP_KERNEL);
 133         if (! fp) {
 134                 snd_printk(KERN_ERR "cannot memdup\n");
 135                 return -ENOMEM;
 136         }
 137         if (fp->nr_rates > 0) {
 138                 rate_table = kmalloc(sizeof(int) * fp->nr_rates, GFP_KERNEL);
 139                 if (!rate_table) {
 140                         kfree(fp);
 141                         return -ENOMEM;
 142                 }
 143                 memcpy(rate_table, fp->rate_table, sizeof(int) * fp->nr_rates);
 144                 fp->rate_table = rate_table;
 145         }
 146
 147         stream = (fp->endpoint & USB_DIR_IN)
 148                 ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
 149         err = snd_usb_add_audio_endpoint(chip, stream, fp);
 150         if (err < 0) {
 151                 kfree(fp);
 152                 kfree(rate_table);
 153                 return err;
 154         }
 155         if (fp->iface != get_iface_desc(&iface->altsetting[0])->bInterfaceNumber ||
 156             fp->altset_idx >= iface->num_altsetting) {
 157                 kfree(fp);
 158                 kfree(rate_table);
 159                 return -EINVAL;
 160         }
 161         alts = &iface->altsetting[fp->altset_idx];
 162         fp->datainterval = snd_usb_parse_datainterval(chip, alts);
 163         fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
 164         usb_set_interface(chip->dev, fp->iface, 0);
 165         snd_usb_init_pitch(chip, fp->iface, alts, fp);
 166         snd_usb_init_sample_rate(chip, fp->iface, alts, fp, fp->rate_max);
 167         return 0;
 168 }
 169
 170 /*
 171  * Create a stream for an Edirol UA-700/UA-25/UA-4FX interface.
 172  * The only way to detect the sample rate is by looking at wMaxPacketSize.
 173  */
 174 static int create_uaxx_quirk(struct snd_usb_audio *chip,
 175                              struct usb_interface *iface,
 176                              struct usb_driver *driver,
 177                              const struct snd_usb_audio_quirk *quirk)
 178 {
 179         static const struct audioformat ua_format = {
 180                 .formats = SNDRV_PCM_FMTBIT_S24_3LE,
 181                 .channels = 2,
 182                 .fmt_type = UAC_FORMAT_TYPE_I,
 183                 .altsetting = 1,
 184                 .altset_idx = 1,
 185                 .rates = SNDRV_PCM_RATE_CONTINUOUS,
 186         };
 187         struct usb_host_interface *alts;
 188         struct usb_interface_descriptor *altsd;
 189         struct audioformat *fp;
 190         int stream, err;
 191
 192         /* both PCM and MIDI interfaces have 2 or more altsettings */
 193         if (iface->num_altsetting < 2)
 194                 return -ENXIO;
 195         alts = &iface->altsetting[1];
 196         altsd = get_iface_desc(alts);
 197
 198         if (altsd->bNumEndpoints == 2) {
 199                 static const struct snd_usb_midi_endpoint_info ua700_ep = {
 200                         .out_cables = 0x0003,
 201                         .in_cables  = 0x0003
 202                 };
 203                 static const struct snd_usb_audio_quirk ua700_quirk = {
 204                         .type = QUIRK_MIDI_FIXED_ENDPOINT,
 205                         .data = &ua700_ep
 206                 };
 207                 static const struct snd_usb_midi_endpoint_info uaxx_ep = {
 208                         .out_cables = 0x0001,
 209                         .in_cables  = 0x0001
 210                 };
 211                 static const struct snd_usb_audio_quirk uaxx_quirk = {
 212                         .type = QUIRK_MIDI_FIXED_ENDPOINT,
 213                         .data = &uaxx_ep
 214                 };
 215                 const struct snd_usb_audio_quirk *quirk =
 216                         chip->usb_id == USB_ID(0x0582, 0x002b)
 217                         ? &ua700_quirk : &uaxx_quirk;
 218                 return snd_usbmidi_create(chip->card, iface,
 219                                           &chip->midi_list, quirk);
 220         }
 221
 222         if (altsd->bNumEndpoints != 1)
 223                 return -ENXIO;
 224
 225         fp = kmalloc(sizeof(*fp), GFP_KERNEL);
 226         if (!fp)
 227                 return -ENOMEM;
 228         memcpy(fp, &ua_format, sizeof(*fp));
 229
 230         fp->iface = altsd->bInterfaceNumber;
 231         fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
 232         fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
 233         fp->datainterval = 0;
 234         fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
 235
 236         switch (fp->maxpacksize) {
 237         case 0x120:
 238                 fp->rate_max = fp->rate_min = 44100;
 239                 break;
 240         case 0x138:
 241         case 0x140:
 242                 fp->rate_max = fp->rate_min = 48000;
 243                 break;
 244         case 0x258:
 245         case 0x260:
 246                 fp->rate_max = fp->rate_min = 96000;
 247                 break;
 248         default:
 249                 snd_printk(KERN_ERR "unknown sample rate\n");
 250                 kfree(fp);
 251                 return -ENXIO;
 252         }
 253
 254         stream = (fp->endpoint & USB_DIR_IN)
 255                 ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
 256         err = snd_usb_add_audio_endpoint(chip, stream, fp);
 257         if (err < 0) {
 258                 kfree(fp);
 259                 return err;
 260         }
 261         usb_set_interface(chip->dev, fp->iface, 0);
 262         return 0;
 263 }
 264
 265 /*
 266  * audio-interface quirks
 267  *
 268  * returns zero if no standard audio/MIDI parsing is needed.
 269  * returns a postive value if standard audio/midi interfaces are parsed
 270  * after this.
 271  * returns a negative value at error.
 272  */
 273 int snd_usb_create_quirk(struct snd_usb_audio *chip,
 274                          struct usb_interface *iface,
 275                          struct usb_driver *driver,
 276                          const struct snd_usb_audio_quirk *quirk)
 277 {
 278         typedef int (*quirk_func_t)(struct snd_usb_audio *,
 279                                     struct usb_interface *,
 280                                     struct usb_driver *,
 281                                     const struct snd_usb_audio_quirk *);
 282         static const quirk_func_t quirk_funcs[] = {
 283                 [QUIRK_IGNORE_INTERFACE] = ignore_interface_quirk,
 284                 [QUIRK_COMPOSITE] = create_composite_quirk,
 285                 [QUIRK_MIDI_STANDARD_INTERFACE] = create_any_midi_quirk,
 286                 [QUIRK_MIDI_FIXED_ENDPOINT] = create_any_midi_quirk,
 287                 [QUIRK_MIDI_YAMAHA] = create_any_midi_quirk,
 288                 [QUIRK_MIDI_MIDIMAN] = create_any_midi_quirk,
 289                 [QUIRK_MIDI_NOVATION] = create_any_midi_quirk,
 290                 [QUIRK_MIDI_FASTLANE] = create_any_midi_quirk,
 291                 [QUIRK_MIDI_EMAGIC] = create_any_midi_quirk,
 292                 [QUIRK_MIDI_CME] = create_any_midi_quirk,
 293                 [QUIRK_MIDI_AKAI] = create_any_midi_quirk,
 294                 [QUIRK_AUDIO_STANDARD_INTERFACE] = create_standard_audio_quirk,
 295                 [QUIRK_AUDIO_FIXED_ENDPOINT] = create_fixed_stream_quirk,
 296                 [QUIRK_AUDIO_EDIROL_UAXX] = create_uaxx_quirk,
 297                 [QUIRK_AUDIO_ALIGN_TRANSFER] = create_align_transfer_quirk
 298         };
 299
 300         if (quirk->type < QUIRK_TYPE_COUNT) {
 301                 return quirk_funcs[quirk->type](chip, iface, driver, quirk);
 302         } else {
 303                 snd_printd(KERN_ERR "invalid quirk type %d\n", quirk->type);
 304                 return -ENXIO;
 305         }
 306 }
 307
 308 /*
 309  * boot quirks
 310  */
 311
 312 #define EXTIGY_FIRMWARE_SIZE_OLD 794
 313 #define EXTIGY_FIRMWARE_SIZE_NEW 483
 314
 315 static int snd_usb_extigy_boot_quirk(struct usb_device *dev, struct usb_interface *intf)
 316 {
 317         struct usb_host_config *config = dev->actconfig;
 318         int err;
 319
 320         if (le16_to_cpu(get_cfg_desc(config)->wTotalLength) == EXTIGY_FIRMWARE_SIZE_OLD ||
 321             le16_to_cpu(get_cfg_desc(config)->wTotalLength) == EXTIGY_FIRMWARE_SIZE_NEW) {
 322                 snd_printdd("sending Extigy boot sequence...\n");
 323                 /* Send message to force it to reconnect with full interface. */
 324                 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev,0),
 325                                       0x10, 0x43, 0x0001, 0x000a, NULL, 0, 1000);
 326                 if (err < 0) snd_printdd("error sending boot message: %d\n", err);
 327                 err = usb_get_descriptor(dev, USB_DT_DEVICE, 0,
 328                                 &dev->descriptor, sizeof(dev->descriptor));
 329                 config = dev->actconfig;
 330                 if (err < 0) snd_printdd("error usb_get_descriptor: %d\n", err);
 331                 err = usb_reset_configuration(dev);
 332                 if (err < 0) snd_printdd("error usb_reset_configuration: %d\n", err);
 333                 snd_printdd("extigy_boot: new boot length = %d\n",
 334                             le16_to_cpu(get_cfg_desc(config)->wTotalLength));
 335                 return -ENODEV; /* quit this anyway */
 336         }
 337         return 0;
 338 }
 339
 340 static int snd_usb_audigy2nx_boot_quirk(struct usb_device *dev)
 341 {
 342         u8 buf = 1;
 343
 344         snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), 0x2a,
 345                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
 346                         0, 0, &buf, 1, 1000);
 347         if (buf == 0) {
 348                 snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), 0x29,
 349                                 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_OTHER,
 350                                 1, 2000, NULL, 0, 1000);
 351                 return -ENODEV;
 352         }
 353         return 0;
 354 }
 355
 356 /*
 357  * C-Media CM106/CM106+ have four 16-bit internal registers that are nicely
 358  * documented in the device's data sheet.
 359  */
 360 static int snd_usb_cm106_write_int_reg(struct usb_device *dev, int reg, u16 value)
 361 {
 362         u8 buf[4];
 363         buf[0] = 0x20;
 364         buf[1] = value & 0xff;
 365         buf[2] = (value >> 8) & 0xff;
 366         buf[3] = reg;
 367         return snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), USB_REQ_SET_CONFIGURATION,
 368                                USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
 369                                0, 0, &buf, 4, 1000);
 370 }
 371
 372 static int snd_usb_cm106_boot_quirk(struct usb_device *dev)
 373 {
 374         /*
 375          * Enable line-out driver mode, set headphone source to front
 376          * channels, enable stereo mic.
 377          */
 378         return snd_usb_cm106_write_int_reg(dev, 2, 0x8004);
 379 }
 380
 381 /*
 382  * C-Media CM6206 is based on CM106 with two additional
 383  * registers that are not documented in the data sheet.
 384  * Values here are chosen based on sniffing USB traffic
 385  * under Windows.
 386  */
 387 static int snd_usb_cm6206_boot_quirk(struct usb_device *dev)
 388 {
 389         int err, reg;
 390         int val[] = {0x200c, 0x3000, 0xf800, 0x143f, 0x0000, 0x3000};
 391
 392         for (reg = 0; reg < ARRAY_SIZE(val); reg++) {
 393                 err = snd_usb_cm106_write_int_reg(dev, reg, val[reg]);
 394                 if (err < 0)
 395                         return err;
 396         }
 397
 398         return err;
 399 }
 400
 401 /*
 402  * This call will put the synth in "USB send" mode, i.e it will send MIDI
 403  * messages through USB (this is disabled at startup). The synth will
 404  * acknowledge by sending a sysex on endpoint 0x85 and by displaying a USB
 405  * sign on its LCD. Values here are chosen based on sniffing USB traffic
 406  * under Windows.
 407  */
 408 static int snd_usb_accessmusic_boot_quirk(struct usb_device *dev)
 409 {
 410         int err, actual_length;
 411
 412         /* "midi send" enable */
 413         static const u8 seq[] = { 0x4e, 0x73, 0x52, 0x01 };
 414
 415         void *buf = kmemdup(seq, ARRAY_SIZE(seq), GFP_KERNEL);
 416         if (!buf)
 417                 return -ENOMEM;
 418         err = usb_interrupt_msg(dev, usb_sndintpipe(dev, 0x05), buf,
 419                         ARRAY_SIZE(seq), &actual_length, 1000);
 420         kfree(buf);
 421         if (err < 0)
 422                 return err;
 423
 424         return 0;
 425 }
 426
 427 /*
 428  * Setup quirks
 429  */
 430 #define AUDIOPHILE_SET                  0x01 /* if set, parse device_setup */
 431 #define AUDIOPHILE_SET_DTS              0x02 /* if set, enable DTS Digital Output */
 432 #define AUDIOPHILE_SET_96K              0x04 /* 48-96KHz rate if set, 8-48KHz otherwise */
 433 #define AUDIOPHILE_SET_24B              0x08 /* 24bits sample if set, 16bits otherwise */
 434 #define AUDIOPHILE_SET_DI               0x10 /* if set, enable Digital Input */
 435 #define AUDIOPHILE_SET_MASK             0x1F /* bit mask for setup value */
 436 #define AUDIOPHILE_SET_24B_48K_DI       0x19 /* value for 24bits+48KHz+Digital Input */
 437 #define AUDIOPHILE_SET_24B_48K_NOTDI    0x09 /* value for 24bits+48KHz+No Digital Input */
 438 #define AUDIOPHILE_SET_16B_48K_DI       0x11 /* value for 16bits+48KHz+Digital Input */
 439 #define AUDIOPHILE_SET_16B_48K_NOTDI    0x01 /* value for 16bits+48KHz+No Digital Input */
 440
 441 static int audiophile_skip_setting_quirk(struct snd_usb_audio *chip,
 442                                          int iface,
 443                                          int altno)
 444 {
 445         /* Reset ALL ifaces to 0 altsetting.
 446          * Call it for every possible altsetting of every interface.
 447          */
 448         usb_set_interface(chip->dev, iface, 0);
 449
 450         if (chip->setup & AUDIOPHILE_SET) {
 451                 if ((chip->setup & AUDIOPHILE_SET_DTS)
 452                     && altno != 6)
 453                         return 1; /* skip this altsetting */
 454                 if ((chip->setup & AUDIOPHILE_SET_96K)
 455                     && altno != 1)
 456                         return 1; /* skip this altsetting */
 457                 if ((chip->setup & AUDIOPHILE_SET_MASK) ==
 458                     AUDIOPHILE_SET_24B_48K_DI && altno != 2)
 459                         return 1; /* skip this altsetting */
 460                 if ((chip->setup & AUDIOPHILE_SET_MASK) ==
 461                     AUDIOPHILE_SET_24B_48K_NOTDI && altno != 3)
 462                         return 1; /* skip this altsetting */
 463                 if ((chip->setup & AUDIOPHILE_SET_MASK) ==
 464                     AUDIOPHILE_SET_16B_48K_DI && altno != 4)
 465                         return 1; /* skip this altsetting */
 466                 if ((chip->setup & AUDIOPHILE_SET_MASK) ==
 467                     AUDIOPHILE_SET_16B_48K_NOTDI && altno != 5)
 468                         return 1; /* skip this altsetting */
 469         }
 470
 471         return 0; /* keep this altsetting */
 472 }
 473
 474 int snd_usb_apply_interface_quirk(struct snd_usb_audio *chip,
 475                                   int iface,
 476                                   int altno)
 477 {
 478         /* audiophile usb: skip altsets incompatible with device_setup */
 479         if (chip->usb_id == USB_ID(0x0763, 0x2003))
 480                 return audiophile_skip_setting_quirk(chip, iface, altno);
 481
 482         return 0;
 483 }
 484
 485 int snd_usb_apply_boot_quirk(struct usb_device *dev,
 486                              struct usb_interface *intf,
 487                              const struct snd_usb_audio_quirk *quirk)
 488 {
 489         u32 id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
 490                         le16_to_cpu(dev->descriptor.idProduct));
 491
 492         /* SB Extigy needs special boot-up sequence */
 493         /* if more models come, this will go to the quirk list. */
 494         if (id == USB_ID(0x041e, 0x3000))
 495                 return snd_usb_extigy_boot_quirk(dev, intf);
 496
 497         /* SB Audigy 2 NX needs its own boot-up magic, too */
 498         if (id == USB_ID(0x041e, 0x3020))
 499                 return snd_usb_audigy2nx_boot_quirk(dev);
 500
 501         /* C-Media CM106 / Turtle Beach Audio Advantage Roadie */
 502         if (id == USB_ID(0x10f5, 0x0200))
 503                 return snd_usb_cm106_boot_quirk(dev);
 504
 505         /* C-Media CM6206 / CM106-Like Sound Device */
 506         if (id == USB_ID(0x0d8c, 0x0102))
 507                 return snd_usb_cm6206_boot_quirk(dev);
 508
 509         /* Access Music VirusTI Desktop */
 510         if (id == USB_ID(0x133e, 0x0815))
 511                 return snd_usb_accessmusic_boot_quirk(dev);
 512
 513         return 0;
 514 }
 515
 516 /*
 517  * check if the device uses big-endian samples
 518  */
 519 int snd_usb_is_big_endian_format(struct snd_usb_audio *chip, struct audioformat *fp)
 520 {
 521         switch (chip->usb_id) {
 522         case USB_ID(0x0763, 0x2001): /* M-Audio Quattro: captured data only */
 523                 if (fp->endpoint & USB_DIR_IN)
 524                         return 1;
 525                 break;
 526         case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
 527                 if (chip->setup == 0x00 ||
 528                     fp->altsetting==1 || fp->altsetting==2 || fp->altsetting==3)
 529                         return 1;
 530         }
 531         return 0;
 532 }
 533
 534 /*
 535  * For E-Mu 0404USB/0202USB/TrackerPre sample rate should be set for device,
 536  * not for interface.
 537  */
 538
 539 enum {
 540         EMU_QUIRK_SR_44100HZ = 0,
 541         EMU_QUIRK_SR_48000HZ,
 542         EMU_QUIRK_SR_88200HZ,
 543         EMU_QUIRK_SR_96000HZ,
 544         EMU_QUIRK_SR_176400HZ,
 545         EMU_QUIRK_SR_192000HZ
 546 };
 547
 548 static void set_format_emu_quirk(struct snd_usb_substream *subs,
 549                                  struct audioformat *fmt)
 550 {
 551         unsigned char emu_samplerate_id = 0;
 552
 553         /* When capture is active
 554          * sample rate shouldn't be changed
 555          * by playback substream
 556          */
 557         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) {
 558                 if (subs->stream->substream[SNDRV_PCM_STREAM_CAPTURE].interface != -1)
 559                         return;
 560         }
 561
 562         switch (fmt->rate_min) {
 563         case 48000:
 564                 emu_samplerate_id = EMU_QUIRK_SR_48000HZ;
 565                 break;
 566         case 88200:
 567                 emu_samplerate_id = EMU_QUIRK_SR_88200HZ;
 568                 break;
 569         case 96000:
 570                 emu_samplerate_id = EMU_QUIRK_SR_96000HZ;
 571                 break;
 572         case 176400:
 573                 emu_samplerate_id = EMU_QUIRK_SR_176400HZ;
 574                 break;
 575         case 192000:
 576                 emu_samplerate_id = EMU_QUIRK_SR_192000HZ;
 577                 break;
 578         default:
 579                 emu_samplerate_id = EMU_QUIRK_SR_44100HZ;
 580                 break;
 581         }
 582         snd_emuusb_set_samplerate(subs->stream->chip, emu_samplerate_id);
 583 }
 584
 585 void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
 586                               struct audioformat *fmt)
 587 {
 588         switch (subs->stream->chip->usb_id) {
 589         case USB_ID(0x041e, 0x3f02): /* E-Mu 0202 USB */
 590         case USB_ID(0x041e, 0x3f04): /* E-Mu 0404 USB */
 591         case USB_ID(0x041e, 0x3f0a): /* E-Mu Tracker Pre */
 592                 set_format_emu_quirk(subs, fmt);
 593                 break;
 594         }
 595 }