sound/pci/au88x0/au88x0_pcm.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 Library 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  * Vortex PCM ALSA driver.
  19  *
  20  * Supports ADB and WT DMA. Unfortunately, WT channels do not run yet.
  21  * It remains stuck,and DMA transfers do not happen.
  22  */
  23 #include <sound/asoundef.h>
  24 #include <linux/time.h>
  25 #include <sound/core.h>
  26 #include <sound/pcm.h>
  27 #include <sound/pcm_params.h>
  28 #include "au88x0.h"
  29
  30 #define VORTEX_PCM_TYPE(x) (x->name[40])
  31
  32 /* hardware definition */
  33 static struct snd_pcm_hardware snd_vortex_playback_hw_adb = {
  34         .info =
  35             (SNDRV_PCM_INFO_MMAP | /* SNDRV_PCM_INFO_RESUME | */
  36              SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_INTERLEAVED |
  37              SNDRV_PCM_INFO_MMAP_VALID),
  38         .formats =
  39             SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_U8 |
  40             SNDRV_PCM_FMTBIT_MU_LAW | SNDRV_PCM_FMTBIT_A_LAW,
  41         .rates = SNDRV_PCM_RATE_CONTINUOUS,
  42         .rate_min = 5000,
  43         .rate_max = 48000,
  44         .channels_min = 1,
  45 #ifdef CHIP_AU8830
  46         .channels_max = 4,
  47 #else
  48         .channels_max = 2,
  49 #endif
  50         .buffer_bytes_max = 0x10000,
  51         .period_bytes_min = 0x1,
  52         .period_bytes_max = 0x1000,
  53         .periods_min = 2,
  54         .periods_max = 32,
  55 };
  56
  57 #ifndef CHIP_AU8820
  58 static struct snd_pcm_hardware snd_vortex_playback_hw_a3d = {
  59         .info =
  60             (SNDRV_PCM_INFO_MMAP | /* SNDRV_PCM_INFO_RESUME | */
  61              SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_INTERLEAVED |
  62              SNDRV_PCM_INFO_MMAP_VALID),
  63         .formats =
  64             SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_U8 |
  65             SNDRV_PCM_FMTBIT_MU_LAW | SNDRV_PCM_FMTBIT_A_LAW,
  66         .rates = SNDRV_PCM_RATE_CONTINUOUS,
  67         .rate_min = 5000,
  68         .rate_max = 48000,
  69         .channels_min = 1,
  70         .channels_max = 1,
  71         .buffer_bytes_max = 0x10000,
  72         .period_bytes_min = 0x100,
  73         .period_bytes_max = 0x1000,
  74         .periods_min = 2,
  75         .periods_max = 64,
  76 };
  77 #endif
  78 static struct snd_pcm_hardware snd_vortex_playback_hw_spdif = {
  79         .info =
  80             (SNDRV_PCM_INFO_MMAP | /* SNDRV_PCM_INFO_RESUME | */
  81              SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_INTERLEAVED |
  82              SNDRV_PCM_INFO_MMAP_VALID),
  83         .formats =
  84             SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_U8 |
  85             SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE | SNDRV_PCM_FMTBIT_MU_LAW |
  86             SNDRV_PCM_FMTBIT_A_LAW,
  87         .rates =
  88             SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
  89         .rate_min = 32000,
  90         .rate_max = 48000,
  91         .channels_min = 1,
  92         .channels_max = 2,
  93         .buffer_bytes_max = 0x10000,
  94         .period_bytes_min = 0x100,
  95         .period_bytes_max = 0x1000,
  96         .periods_min = 2,
  97         .periods_max = 64,
  98 };
  99
 100 #ifndef CHIP_AU8810
 101 static struct snd_pcm_hardware snd_vortex_playback_hw_wt = {
 102         .info = (SNDRV_PCM_INFO_MMAP |
 103                  SNDRV_PCM_INFO_INTERLEAVED |
 104                  SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP_VALID),
 105         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 106         .rates = SNDRV_PCM_RATE_8000_48000 | SNDRV_PCM_RATE_CONTINUOUS, // SNDRV_PCM_RATE_48000,
 107         .rate_min = 8000,
 108         .rate_max = 48000,
 109         .channels_min = 1,
 110         .channels_max = 2,
 111         .buffer_bytes_max = 0x10000,
 112         .period_bytes_min = 0x0400,
 113         .period_bytes_max = 0x1000,
 114         .periods_min = 2,
 115         .periods_max = 64,
 116 };
 117 #endif
 118 /* open callback */
 119 static int snd_vortex_pcm_open(struct snd_pcm_substream *substream)
 120 {
 121         vortex_t *vortex = snd_pcm_substream_chip(substream);
 122         struct snd_pcm_runtime *runtime = substream->runtime;
 123         int err;
 124
 125         /* Force equal size periods */
 126         if ((err =
 127              snd_pcm_hw_constraint_integer(runtime,
 128                                            SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
 129                 return err;
 130         /* Avoid PAGE_SIZE boundary to fall inside of a period. */
 131         if ((err =
 132              snd_pcm_hw_constraint_pow2(runtime, 0,
 133                                         SNDRV_PCM_HW_PARAM_PERIOD_BYTES)) < 0)
 134                 return err;
 135
 136         if (VORTEX_PCM_TYPE(substream->pcm) != VORTEX_PCM_WT) {
 137 #ifndef CHIP_AU8820
 138                 if (VORTEX_PCM_TYPE(substream->pcm) == VORTEX_PCM_A3D) {
 139                         runtime->hw = snd_vortex_playback_hw_a3d;
 140                 }
 141 #endif
 142                 if (VORTEX_PCM_TYPE(substream->pcm) == VORTEX_PCM_SPDIF) {
 143                         runtime->hw = snd_vortex_playback_hw_spdif;
 144                         switch (vortex->spdif_sr) {
 145                         case 32000:
 146                                 runtime->hw.rates = SNDRV_PCM_RATE_32000;
 147                                 break;
 148                         case 44100:
 149                                 runtime->hw.rates = SNDRV_PCM_RATE_44100;
 150                                 break;
 151                         case 48000:
 152                                 runtime->hw.rates = SNDRV_PCM_RATE_48000;
 153                                 break;
 154                         }
 155                 }
 156                 if (VORTEX_PCM_TYPE(substream->pcm) == VORTEX_PCM_ADB
 157                     || VORTEX_PCM_TYPE(substream->pcm) == VORTEX_PCM_I2S)
 158                         runtime->hw = snd_vortex_playback_hw_adb;
 159                 substream->runtime->private_data = NULL;
 160         }
 161 #ifndef CHIP_AU8810
 162         else {
 163                 runtime->hw = snd_vortex_playback_hw_wt;
 164                 substream->runtime->private_data = NULL;
 165         }
 166 #endif
 167         return 0;
 168 }
 169
 170 /* close callback */
 171 static int snd_vortex_pcm_close(struct snd_pcm_substream *substream)
 172 {
 173         //vortex_t *chip = snd_pcm_substream_chip(substream);
 174         stream_t *stream = (stream_t *) substream->runtime->private_data;
 175
 176         // the hardware-specific codes will be here
 177         if (stream != NULL) {
 178                 stream->substream = NULL;
 179                 stream->nr_ch = 0;
 180         }
 181         substream->runtime->private_data = NULL;
 182         return 0;
 183 }
 184
 185 /* hw_params callback */
 186 static int
 187 snd_vortex_pcm_hw_params(struct snd_pcm_substream *substream,
 188                          struct snd_pcm_hw_params *hw_params)
 189 {
 190         vortex_t *chip = snd_pcm_substream_chip(substream);
 191         stream_t *stream = (stream_t *) (substream->runtime->private_data);
 192         struct snd_sg_buf *sgbuf;
 193         int err;
 194
 195         // Alloc buffer memory.
 196         err =
 197             snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
 198         if (err < 0) {
 199                 printk(KERN_ERR "Vortex: pcm page alloc failed!\n");
 200                 return err;
 201         }
 202         //sgbuf = (struct snd_sg_buf *) substream->runtime->dma_private;
 203         sgbuf = snd_pcm_substream_sgbuf(substream);
 204         /*
 205            printk(KERN_INFO "Vortex: periods %d, period_bytes %d, channels = %d\n", params_periods(hw_params),
 206            params_period_bytes(hw_params), params_channels(hw_params));
 207          */
 208         spin_lock_irq(&chip->lock);
 209         // Make audio routes and config buffer DMA.
 210         if (VORTEX_PCM_TYPE(substream->pcm) != VORTEX_PCM_WT) {
 211                 int dma, type = VORTEX_PCM_TYPE(substream->pcm);
 212                 /* Dealloc any routes. */
 213                 if (stream != NULL)
 214                         vortex_adb_allocroute(chip, stream->dma,
 215                                               stream->nr_ch, stream->dir,
 216                                               stream->type);
 217                 /* Alloc routes. */
 218                 dma =
 219                     vortex_adb_allocroute(chip, -1,
 220                                           params_channels(hw_params),
 221                                           substream->stream, type);
 222                 if (dma < 0) {
 223                         spin_unlock_irq(&chip->lock);
 224                         return dma;
 225                 }
 226                 stream = substream->runtime->private_data = &chip->dma_adb[dma];
 227                 stream->substream = substream;
 228                 /* Setup Buffers. */
 229                 vortex_adbdma_setbuffers(chip, dma, sgbuf,
 230                                          params_period_bytes(hw_params),
 231                                          params_periods(hw_params));
 232         }
 233 #ifndef CHIP_AU8810
 234         else {
 235                 /* if (stream != NULL)
 236                    vortex_wt_allocroute(chip, substream->number, 0); */
 237                 vortex_wt_allocroute(chip, substream->number,
 238                                      params_channels(hw_params));
 239                 stream = substream->runtime->private_data =
 240                     &chip->dma_wt[substream->number];
 241                 stream->dma = substream->number;
 242                 stream->substream = substream;
 243                 vortex_wtdma_setbuffers(chip, substream->number, sgbuf,
 244                                         params_period_bytes(hw_params),
 245                                         params_periods(hw_params));
 246         }
 247 #endif
 248         spin_unlock_irq(&chip->lock);
 249         return 0;
 250 }
 251
 252 /* hw_free callback */
 253 static int snd_vortex_pcm_hw_free(struct snd_pcm_substream *substream)
 254 {
 255         vortex_t *chip = snd_pcm_substream_chip(substream);
 256         stream_t *stream = (stream_t *) (substream->runtime->private_data);
 257
 258         spin_lock_irq(&chip->lock);
 259         // Delete audio routes.
 260         if (VORTEX_PCM_TYPE(substream->pcm) != VORTEX_PCM_WT) {
 261                 if (stream != NULL)
 262                         vortex_adb_allocroute(chip, stream->dma,
 263                                               stream->nr_ch, stream->dir,
 264                                               stream->type);
 265         }
 266 #ifndef CHIP_AU8810
 267         else {
 268                 if (stream != NULL)
 269                         vortex_wt_allocroute(chip, stream->dma, 0);
 270         }
 271 #endif
 272         substream->runtime->private_data = NULL;
 273         spin_unlock_irq(&chip->lock);
 274
 275         return snd_pcm_lib_free_pages(substream);
 276 }
 277
 278 /* prepare callback */
 279 static int snd_vortex_pcm_prepare(struct snd_pcm_substream *substream)
 280 {
 281         vortex_t *chip = snd_pcm_substream_chip(substream);
 282         struct snd_pcm_runtime *runtime = substream->runtime;
 283         stream_t *stream = (stream_t *) substream->runtime->private_data;
 284         int dma = stream->dma, fmt, dir;
 285
 286         // set up the hardware with the current configuration.
 287         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 288                 dir = 1;
 289         else
 290                 dir = 0;
 291         fmt = vortex_alsafmt_aspfmt(runtime->format);
 292         spin_lock_irq(&chip->lock);
 293         if (VORTEX_PCM_TYPE(substream->pcm) != VORTEX_PCM_WT) {
 294                 vortex_adbdma_setmode(chip, dma, 1, dir, fmt, 0 /*? */ ,
 295                                       0);
 296                 vortex_adbdma_setstartbuffer(chip, dma, 0);
 297                 if (VORTEX_PCM_TYPE(substream->pcm) != VORTEX_PCM_SPDIF)
 298                         vortex_adb_setsrc(chip, dma, runtime->rate, dir);
 299         }
 300 #ifndef CHIP_AU8810
 301         else {
 302                 vortex_wtdma_setmode(chip, dma, 1, fmt, 0, 0);
 303                 // FIXME: Set rate (i guess using vortex_wt_writereg() somehow).
 304                 vortex_wtdma_setstartbuffer(chip, dma, 0);
 305         }
 306 #endif
 307         spin_unlock_irq(&chip->lock);
 308         return 0;
 309 }
 310
 311 /* trigger callback */
 312 static int snd_vortex_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 313 {
 314         vortex_t *chip = snd_pcm_substream_chip(substream);
 315         stream_t *stream = (stream_t *) substream->runtime->private_data;
 316         int dma = stream->dma;
 317
 318         spin_lock(&chip->lock);
 319         switch (cmd) {
 320         case SNDRV_PCM_TRIGGER_START:
 321                 // do something to start the PCM engine
 322                 //printk(KERN_INFO "vortex: start %d\n", dma);
 323                 stream->fifo_enabled = 1;
 324                 if (VORTEX_PCM_TYPE(substream->pcm) != VORTEX_PCM_WT) {
 325                         vortex_adbdma_resetup(chip, dma);
 326                         vortex_adbdma_startfifo(chip, dma);
 327                 }
 328 #ifndef CHIP_AU8810
 329                 else {
 330                         printk(KERN_INFO "vortex: wt start %d\n", dma);
 331                         vortex_wtdma_startfifo(chip, dma);
 332                 }
 333 #endif
 334                 break;
 335         case SNDRV_PCM_TRIGGER_STOP:
 336                 // do something to stop the PCM engine
 337                 //printk(KERN_INFO "vortex: stop %d\n", dma);
 338                 stream->fifo_enabled = 0;
 339                 if (VORTEX_PCM_TYPE(substream->pcm) != VORTEX_PCM_WT)
 340                         vortex_adbdma_pausefifo(chip, dma);
 341                 //vortex_adbdma_stopfifo(chip, dma);
 342 #ifndef CHIP_AU8810
 343                 else {
 344                         printk(KERN_INFO "vortex: wt stop %d\n", dma);
 345                         vortex_wtdma_stopfifo(chip, dma);
 346                 }
 347 #endif
 348                 break;
 349         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 350                 //printk(KERN_INFO "vortex: pause %d\n", dma);
 351                 if (VORTEX_PCM_TYPE(substream->pcm) != VORTEX_PCM_WT)
 352                         vortex_adbdma_pausefifo(chip, dma);
 353 #ifndef CHIP_AU8810
 354                 else
 355                         vortex_wtdma_pausefifo(chip, dma);
 356 #endif
 357                 break;
 358         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 359                 //printk(KERN_INFO "vortex: resume %d\n", dma);
 360                 if (VORTEX_PCM_TYPE(substream->pcm) != VORTEX_PCM_WT)
 361                         vortex_adbdma_resumefifo(chip, dma);
 362 #ifndef CHIP_AU8810
 363                 else
 364                         vortex_wtdma_resumefifo(chip, dma);
 365 #endif
 366                 break;
 367         default:
 368                 spin_unlock(&chip->lock);
 369                 return -EINVAL;
 370         }
 371         spin_unlock(&chip->lock);
 372         return 0;
 373 }
 374
 375 /* pointer callback */
 376 static snd_pcm_uframes_t snd_vortex_pcm_pointer(struct snd_pcm_substream *substream)
 377 {
 378         vortex_t *chip = snd_pcm_substream_chip(substream);
 379         stream_t *stream = (stream_t *) substream->runtime->private_data;
 380         int dma = stream->dma;
 381         snd_pcm_uframes_t current_ptr = 0;
 382
 383         spin_lock(&chip->lock);
 384         if (VORTEX_PCM_TYPE(substream->pcm) != VORTEX_PCM_WT)
 385                 current_ptr = vortex_adbdma_getlinearpos(chip, dma);
 386 #ifndef CHIP_AU8810
 387         else
 388                 current_ptr = vortex_wtdma_getlinearpos(chip, dma);
 389 #endif
 390         //printk(KERN_INFO "vortex: pointer = 0x%x\n", current_ptr);
 391         spin_unlock(&chip->lock);
 392         return (bytes_to_frames(substream->runtime, current_ptr));
 393 }
 394
 395 /* Page callback. */
 396 /*
 397 static struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigned long offset) {
 398
 399
 400 }
 401 */
 402 /* operators */
 403 static struct snd_pcm_ops snd_vortex_playback_ops = {
 404         .open = snd_vortex_pcm_open,
 405         .close = snd_vortex_pcm_close,
 406         .ioctl = snd_pcm_lib_ioctl,
 407         .hw_params = snd_vortex_pcm_hw_params,
 408         .hw_free = snd_vortex_pcm_hw_free,
 409         .prepare = snd_vortex_pcm_prepare,
 410         .trigger = snd_vortex_pcm_trigger,
 411         .pointer = snd_vortex_pcm_pointer,
 412         .page = snd_pcm_sgbuf_ops_page,
 413 };
 414
 415 /*
 416 *  definitions of capture are omitted here...
 417 */
 418
 419 static char *vortex_pcm_prettyname[VORTEX_PCM_LAST] = {
 420         "AU88x0 ADB",
 421         "AU88x0 SPDIF",
 422         "AU88x0 A3D",
 423         "AU88x0 WT",
 424         "AU88x0 I2S",
 425 };
 426 static char *vortex_pcm_name[VORTEX_PCM_LAST] = {
 427         "adb",
 428         "spdif",
 429         "a3d",
 430         "wt",
 431         "i2s",
 432 };
 433
 434 /* SPDIF kcontrol */
 435
 436 static int snd_vortex_spdif_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
 437 {
 438         uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
 439         uinfo->count = 1;
 440         return 0;
 441 }
 442
 443 static int snd_vortex_spdif_mask_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 444 {
 445         ucontrol->value.iec958.status[0] = 0xff;
 446         ucontrol->value.iec958.status[1] = 0xff;
 447         ucontrol->value.iec958.status[2] = 0xff;
 448         ucontrol->value.iec958.status[3] = IEC958_AES3_CON_FS;
 449         return 0;
 450 }
 451
 452 static int snd_vortex_spdif_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 453 {
 454         vortex_t *vortex = snd_kcontrol_chip(kcontrol);
 455         ucontrol->value.iec958.status[0] = 0x00;
 456         ucontrol->value.iec958.status[1] = IEC958_AES1_CON_ORIGINAL|IEC958_AES1_CON_DIGDIGCONV_ID;
 457         ucontrol->value.iec958.status[2] = 0x00;
 458         switch (vortex->spdif_sr) {
 459         case 32000: ucontrol->value.iec958.status[3] = IEC958_AES3_CON_FS_32000; break;
 460         case 44100: ucontrol->value.iec958.status[3] = IEC958_AES3_CON_FS_44100; break;
 461         case 48000: ucontrol->value.iec958.status[3] = IEC958_AES3_CON_FS_48000; break;
 462         }
 463         return 0;
 464 }
 465
 466 static int snd_vortex_spdif_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 467 {
 468         vortex_t *vortex = snd_kcontrol_chip(kcontrol);
 469         int spdif_sr = 48000;
 470         switch (ucontrol->value.iec958.status[3] & IEC958_AES3_CON_FS) {
 471         case IEC958_AES3_CON_FS_32000: spdif_sr = 32000; break;
 472         case IEC958_AES3_CON_FS_44100: spdif_sr = 44100; break;
 473         case IEC958_AES3_CON_FS_48000: spdif_sr = 48000; break;
 474         }
 475         if (spdif_sr == vortex->spdif_sr)
 476                 return 0;
 477         vortex->spdif_sr = spdif_sr;
 478         vortex_spdif_init(vortex, vortex->spdif_sr, 1);
 479         return 1;
 480 }
 481
 482 /* spdif controls */
 483 static struct snd_kcontrol_new snd_vortex_mixer_spdif[] __devinitdata = {
 484         {
 485                 .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 486                 .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT),
 487                 .info =         snd_vortex_spdif_info,
 488                 .get =          snd_vortex_spdif_get,
 489                 .put =          snd_vortex_spdif_put,
 490         },
 491         {
 492                 .access =       SNDRV_CTL_ELEM_ACCESS_READ,
 493                 .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 494                 .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,CON_MASK),
 495                 .info =         snd_vortex_spdif_info,
 496                 .get =          snd_vortex_spdif_mask_get
 497         },
 498 };
 499
 500 /* create a pcm device */
 501 static int __devinit snd_vortex_new_pcm(vortex_t * chip, int idx, int nr)
 502 {
 503         struct snd_pcm *pcm;
 504         struct snd_kcontrol *kctl;
 505         int i;
 506         int err, nr_capt;
 507
 508         if ((chip == 0) || (idx < 0) || (idx >= VORTEX_PCM_LAST))
 509                 return -ENODEV;
 510
 511         /* idx indicates which kind of PCM device. ADB, SPDIF, I2S and A3D share the
 512          * same dma engine. WT uses it own separate dma engine whcih cant capture. */
 513         if (idx == VORTEX_PCM_ADB)
 514                 nr_capt = nr;
 515         else
 516                 nr_capt = 0;
 517         if ((err =
 518              snd_pcm_new(chip->card, vortex_pcm_prettyname[idx], idx, nr,
 519                          nr_capt, &pcm)) < 0)
 520                 return err;
 521         strcpy(pcm->name, vortex_pcm_name[idx]);
 522         chip->pcm[idx] = pcm;
 523         // This is an evil hack, but it saves a lot of duplicated code.
 524         VORTEX_PCM_TYPE(pcm) = idx;
 525         pcm->private_data = chip;
 526         /* set operators */
 527         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 528                         &snd_vortex_playback_ops);
 529         if (idx == VORTEX_PCM_ADB)
 530                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 531                                 &snd_vortex_playback_ops);
 532
 533         /* pre-allocation of Scatter-Gather buffers */
 534
 535         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV_SG,
 536                                               snd_dma_pci_data(chip->pci_dev),
 537                                               0x10000, 0x10000);
 538
 539         if (VORTEX_PCM_TYPE(pcm) == VORTEX_PCM_SPDIF) {
 540                 for (i = 0; i < ARRAY_SIZE(snd_vortex_mixer_spdif); i++) {
 541                         kctl = snd_ctl_new1(&snd_vortex_mixer_spdif[i], chip);
 542                         if (!kctl)
 543                                 return -ENOMEM;
 544                         if ((err = snd_ctl_add(chip->card, kctl)) < 0)
 545                                 return err;
 546                 }
 547         }
 548         return 0;
 549 }