sound/isa/sb/sb8_main.c

   1 /*
   2  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   3  *                   Uros Bizjak <uros@kss-loka.si>
   4  *
   5  *  Routines for control of 8-bit SoundBlaster cards and clones
   6  *  Please note: I don't have access to old SB8 soundcards.
   7  *
   8  *
   9  *   This program is free software; you can redistribute it and/or modify
  10  *   it under the terms of the GNU General Public License as published by
  11  *   the Free Software Foundation; either version 2 of the License, or
  12  *   (at your option) any later version.
  13  *
  14  *   This program is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *   GNU General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU General Public License
  20  *   along with this program; if not, write to the Free Software
  21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  22  *
  23  * --
  24  *
  25  * Thu Apr 29 20:36:17 BST 1999 George David Morrison <gdm@gedamo.demon.co.uk>
  26  *   DSP can't respond to commands whilst in "high speed" mode. Caused
  27  *   glitching during playback. Fixed.
  28  *
  29  * Wed Jul 12 22:02:55 CEST 2000 Uros Bizjak <uros@kss-loka.si>
  30  *   Cleaned up and rewrote lowlevel routines.
  31  */
  32
  33 #include <asm/io.h>
  34 #include <asm/dma.h>
  35 #include <linux/init.h>
  36 #include <linux/time.h>
  37 #include <sound/core.h>
  38 #include <sound/sb.h>
  39
  40 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Uros Bizjak <uros@kss-loka.si>");
  41 MODULE_DESCRIPTION("Routines for control of 8-bit SoundBlaster cards and clones");
  42 MODULE_LICENSE("GPL");
  43
  44 #define SB8_CLOCK       1000000
  45 #define SB8_DEN(v)      ((SB8_CLOCK + (v) / 2) / (v))
  46 #define SB8_RATE(v)     (SB8_CLOCK / SB8_DEN(v))
  47
  48 static struct snd_ratnum clock = {
  49         .num = SB8_CLOCK,
  50         .den_min = 1,
  51         .den_max = 256,
  52         .den_step = 1,
  53 };
  54
  55 static struct snd_pcm_hw_constraint_ratnums hw_constraints_clock = {
  56         .nrats = 1,
  57         .rats = &clock,
  58 };
  59
  60 static struct snd_ratnum stereo_clocks[] = {
  61         {
  62                 .num = SB8_CLOCK,
  63                 .den_min = SB8_DEN(22050),
  64                 .den_max = SB8_DEN(22050),
  65                 .den_step = 1,
  66         },
  67         {
  68                 .num = SB8_CLOCK,
  69                 .den_min = SB8_DEN(11025),
  70                 .den_max = SB8_DEN(11025),
  71                 .den_step = 1,
  72         }
  73 };
  74
  75 static int snd_sb8_hw_constraint_rate_channels(struct snd_pcm_hw_params *params,
  76                                                struct snd_pcm_hw_rule *rule)
  77 {
  78         struct snd_interval *c = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
  79         if (c->min > 1) {
  80                 unsigned int num = 0, den = 0;
  81                 int err = snd_interval_ratnum(hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE),
  82                                           2, stereo_clocks, &num, &den);
  83                 if (err >= 0 && den) {
  84                         params->rate_num = num;
  85                         params->rate_den = den;
  86                 }
  87                 return err;
  88         }
  89         return 0;
  90 }
  91
  92 static int snd_sb8_hw_constraint_channels_rate(struct snd_pcm_hw_params *params,
  93                                                struct snd_pcm_hw_rule *rule)
  94 {
  95         struct snd_interval *r = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
  96         if (r->min > SB8_RATE(22050) || r->max <= SB8_RATE(11025)) {
  97                 struct snd_interval t = { .min = 1, .max = 1 };
  98                 return snd_interval_refine(hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS), &t);
  99         }
 100         return 0;
 101 }
 102
 103 static int snd_sb8_playback_prepare(struct snd_pcm_substream *substream)
 104 {
 105         unsigned long flags;
 106         struct snd_sb *chip = snd_pcm_substream_chip(substream);
 107         struct snd_pcm_runtime *runtime = substream->runtime;
 108         unsigned int mixreg, rate, size, count;
 109
 110         rate = runtime->rate;
 111         switch (chip->hardware) {
 112         case SB_HW_PRO:
 113                 if (runtime->channels > 1) {
 114                         if (snd_BUG_ON(rate != SB8_RATE(11025) &&
 115                                        rate != SB8_RATE(22050)))
 116                                 return -EINVAL;
 117                         chip->playback_format = SB_DSP_HI_OUTPUT_AUTO;
 118                         break;
 119                 }
 120                 /* fallthru */
 121         case SB_HW_201:
 122                 if (rate > 23000) {
 123                         chip->playback_format = SB_DSP_HI_OUTPUT_AUTO;
 124                         break;
 125                 }
 126                 /* fallthru */
 127         case SB_HW_20:
 128                 chip->playback_format = SB_DSP_LO_OUTPUT_AUTO;
 129                 break;
 130         case SB_HW_10:
 131                 chip->playback_format = SB_DSP_OUTPUT;
 132                 break;
 133         default:
 134                 return -EINVAL;
 135         }
 136         size = chip->p_dma_size = snd_pcm_lib_buffer_bytes(substream);
 137         count = chip->p_period_size = snd_pcm_lib_period_bytes(substream);
 138         spin_lock_irqsave(&chip->reg_lock, flags);
 139         snd_sbdsp_command(chip, SB_DSP_SPEAKER_ON);
 140         if (runtime->channels > 1) {
 141                 /* set playback stereo mode */
 142                 spin_lock(&chip->mixer_lock);
 143                 mixreg = snd_sbmixer_read(chip, SB_DSP_STEREO_SW);
 144                 snd_sbmixer_write(chip, SB_DSP_STEREO_SW, mixreg | 0x02);
 145                 spin_unlock(&chip->mixer_lock);
 146
 147                 /* Soundblaster hardware programming reference guide, 3-23 */
 148                 snd_sbdsp_command(chip, SB_DSP_DMA8_EXIT);
 149                 runtime->dma_area[0] = 0x80;
 150                 snd_dma_program(chip->dma8, runtime->dma_addr, 1, DMA_MODE_WRITE);
 151                 /* force interrupt */
 152                 chip->mode = SB_MODE_HALT;
 153                 snd_sbdsp_command(chip, SB_DSP_OUTPUT);
 154                 snd_sbdsp_command(chip, 0);
 155                 snd_sbdsp_command(chip, 0);
 156         }
 157         snd_sbdsp_command(chip, SB_DSP_SAMPLE_RATE);
 158         if (runtime->channels > 1) {
 159                 snd_sbdsp_command(chip, 256 - runtime->rate_den / 2);
 160                 spin_lock(&chip->mixer_lock);
 161                 /* save output filter status and turn it off */
 162                 mixreg = snd_sbmixer_read(chip, SB_DSP_PLAYBACK_FILT);
 163                 snd_sbmixer_write(chip, SB_DSP_PLAYBACK_FILT, mixreg | 0x20);
 164                 spin_unlock(&chip->mixer_lock);
 165                 /* just use force_mode16 for temporary storate... */
 166                 chip->force_mode16 = mixreg;
 167         } else {
 168                 snd_sbdsp_command(chip, 256 - runtime->rate_den);
 169         }
 170         if (chip->playback_format != SB_DSP_OUTPUT) {
 171                 count--;
 172                 snd_sbdsp_command(chip, SB_DSP_BLOCK_SIZE);
 173                 snd_sbdsp_command(chip, count & 0xff);
 174                 snd_sbdsp_command(chip, count >> 8);
 175         }
 176         spin_unlock_irqrestore(&chip->reg_lock, flags);
 177         snd_dma_program(chip->dma8, runtime->dma_addr,
 178                         size, DMA_MODE_WRITE | DMA_AUTOINIT);
 179         return 0;
 180 }
 181
 182 static int snd_sb8_playback_trigger(struct snd_pcm_substream *substream,
 183                                     int cmd)
 184 {
 185         unsigned long flags;
 186         struct snd_sb *chip = snd_pcm_substream_chip(substream);
 187         unsigned int count;
 188
 189         spin_lock_irqsave(&chip->reg_lock, flags);
 190         switch (cmd) {
 191         case SNDRV_PCM_TRIGGER_START:
 192                 snd_sbdsp_command(chip, chip->playback_format);
 193                 if (chip->playback_format == SB_DSP_OUTPUT) {
 194                         count = chip->p_period_size - 1;
 195                         snd_sbdsp_command(chip, count & 0xff);
 196                         snd_sbdsp_command(chip, count >> 8);
 197                 }
 198                 break;
 199         case SNDRV_PCM_TRIGGER_STOP:
 200                 if (chip->playback_format == SB_DSP_HI_OUTPUT_AUTO) {
 201                         struct snd_pcm_runtime *runtime = substream->runtime;
 202                         snd_sbdsp_reset(chip);
 203                         if (runtime->channels > 1) {
 204                                 spin_lock(&chip->mixer_lock);
 205                                 /* restore output filter and set hardware to mono mode */
 206                                 snd_sbmixer_write(chip, SB_DSP_STEREO_SW, chip->force_mode16 & ~0x02);
 207                                 spin_unlock(&chip->mixer_lock);
 208                         }
 209                 } else {
 210                         snd_sbdsp_command(chip, SB_DSP_DMA8_OFF);
 211                 }
 212                 snd_sbdsp_command(chip, SB_DSP_SPEAKER_OFF);
 213         }
 214         spin_unlock_irqrestore(&chip->reg_lock, flags);
 215         chip->mode = (cmd == SNDRV_PCM_TRIGGER_START) ? SB_MODE_PLAYBACK_8 : SB_MODE_HALT;
 216         return 0;
 217 }
 218
 219 static int snd_sb8_hw_params(struct snd_pcm_substream *substream,
 220                              struct snd_pcm_hw_params *hw_params)
 221 {
 222         return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
 223 }
 224
 225 static int snd_sb8_hw_free(struct snd_pcm_substream *substream)
 226 {
 227         snd_pcm_lib_free_pages(substream);
 228         return 0;
 229 }
 230
 231 static int snd_sb8_capture_prepare(struct snd_pcm_substream *substream)
 232 {
 233         unsigned long flags;
 234         struct snd_sb *chip = snd_pcm_substream_chip(substream);
 235         struct snd_pcm_runtime *runtime = substream->runtime;
 236         unsigned int mixreg, rate, size, count;
 237
 238         rate = runtime->rate;
 239         switch (chip->hardware) {
 240         case SB_HW_PRO:
 241                 if (runtime->channels > 1) {
 242                         if (snd_BUG_ON(rate != SB8_RATE(11025) &&
 243                                        rate != SB8_RATE(22050)))
 244                                 return -EINVAL;
 245                         chip->capture_format = SB_DSP_HI_INPUT_AUTO;
 246                         break;
 247                 }
 248                 chip->capture_format = (rate > 23000) ? SB_DSP_HI_INPUT_AUTO : SB_DSP_LO_INPUT_AUTO;
 249                 break;
 250         case SB_HW_201:
 251                 if (rate > 13000) {
 252                         chip->capture_format = SB_DSP_HI_INPUT_AUTO;
 253                         break;
 254                 }
 255                 /* fallthru */
 256         case SB_HW_20:
 257                 chip->capture_format = SB_DSP_LO_INPUT_AUTO;
 258                 break;
 259         case SB_HW_10:
 260                 chip->capture_format = SB_DSP_INPUT;
 261                 break;
 262         default:
 263                 return -EINVAL;
 264         }
 265         size = chip->c_dma_size = snd_pcm_lib_buffer_bytes(substream);
 266         count = chip->c_period_size = snd_pcm_lib_period_bytes(substream);
 267         spin_lock_irqsave(&chip->reg_lock, flags);
 268         snd_sbdsp_command(chip, SB_DSP_SPEAKER_OFF);
 269         if (runtime->channels > 1)
 270                 snd_sbdsp_command(chip, SB_DSP_STEREO_8BIT);
 271         snd_sbdsp_command(chip, SB_DSP_SAMPLE_RATE);
 272         if (runtime->channels > 1) {
 273                 snd_sbdsp_command(chip, 256 - runtime->rate_den / 2);
 274                 spin_lock(&chip->mixer_lock);
 275                 /* save input filter status and turn it off */
 276                 mixreg = snd_sbmixer_read(chip, SB_DSP_CAPTURE_FILT);
 277                 snd_sbmixer_write(chip, SB_DSP_CAPTURE_FILT, mixreg | 0x20);
 278                 spin_unlock(&chip->mixer_lock);
 279                 /* just use force_mode16 for temporary storate... */
 280                 chip->force_mode16 = mixreg;
 281         } else {
 282                 snd_sbdsp_command(chip, 256 - runtime->rate_den);
 283         }
 284         if (chip->capture_format != SB_DSP_INPUT) {
 285                 count--;
 286                 snd_sbdsp_command(chip, SB_DSP_BLOCK_SIZE);
 287                 snd_sbdsp_command(chip, count & 0xff);
 288                 snd_sbdsp_command(chip, count >> 8);
 289         }
 290         spin_unlock_irqrestore(&chip->reg_lock, flags);
 291         snd_dma_program(chip->dma8, runtime->dma_addr,
 292                         size, DMA_MODE_READ | DMA_AUTOINIT);
 293         return 0;
 294 }
 295
 296 static int snd_sb8_capture_trigger(struct snd_pcm_substream *substream,
 297                                    int cmd)
 298 {
 299         unsigned long flags;
 300         struct snd_sb *chip = snd_pcm_substream_chip(substream);
 301         unsigned int count;
 302
 303         spin_lock_irqsave(&chip->reg_lock, flags);
 304         switch (cmd) {
 305         case SNDRV_PCM_TRIGGER_START:
 306                 snd_sbdsp_command(chip, chip->capture_format);
 307                 if (chip->capture_format == SB_DSP_INPUT) {
 308                         count = chip->c_period_size - 1;
 309                         snd_sbdsp_command(chip, count & 0xff);
 310                         snd_sbdsp_command(chip, count >> 8);
 311                 }
 312                 break;
 313         case SNDRV_PCM_TRIGGER_STOP:
 314                 if (chip->capture_format == SB_DSP_HI_INPUT_AUTO) {
 315                         struct snd_pcm_runtime *runtime = substream->runtime;
 316                         snd_sbdsp_reset(chip);
 317                         if (runtime->channels > 1) {
 318                                 /* restore input filter status */
 319                                 spin_lock(&chip->mixer_lock);
 320                                 snd_sbmixer_write(chip, SB_DSP_CAPTURE_FILT, chip->force_mode16);
 321                                 spin_unlock(&chip->mixer_lock);
 322                                 /* set hardware to mono mode */
 323                                 snd_sbdsp_command(chip, SB_DSP_MONO_8BIT);
 324                         }
 325                 } else {
 326                         snd_sbdsp_command(chip, SB_DSP_DMA8_OFF);
 327                 }
 328                 snd_sbdsp_command(chip, SB_DSP_SPEAKER_OFF);
 329         }
 330         spin_unlock_irqrestore(&chip->reg_lock, flags);
 331         chip->mode = (cmd == SNDRV_PCM_TRIGGER_START) ? SB_MODE_CAPTURE_8 : SB_MODE_HALT;
 332         return 0;
 333 }
 334
 335 irqreturn_t snd_sb8dsp_interrupt(struct snd_sb *chip)
 336 {
 337         struct snd_pcm_substream *substream;
 338         struct snd_pcm_runtime *runtime;
 339
 340         snd_sb_ack_8bit(chip);
 341         switch (chip->mode) {
 342         case SB_MODE_PLAYBACK_8:        /* ok.. playback is active */
 343                 substream = chip->playback_substream;
 344                 runtime = substream->runtime;
 345                 if (chip->playback_format == SB_DSP_OUTPUT)
 346                         snd_sb8_playback_trigger(substream, SNDRV_PCM_TRIGGER_START);
 347                 snd_pcm_period_elapsed(substream);
 348                 break;
 349         case SB_MODE_CAPTURE_8:
 350                 substream = chip->capture_substream;
 351                 runtime = substream->runtime;
 352                 if (chip->capture_format == SB_DSP_INPUT)
 353                         snd_sb8_capture_trigger(substream, SNDRV_PCM_TRIGGER_START);
 354                 snd_pcm_period_elapsed(substream);
 355                 break;
 356         }
 357         return IRQ_HANDLED;
 358 }
 359
 360 static snd_pcm_uframes_t snd_sb8_playback_pointer(struct snd_pcm_substream *substream)
 361 {
 362         struct snd_sb *chip = snd_pcm_substream_chip(substream);
 363         size_t ptr;
 364
 365         if (chip->mode != SB_MODE_PLAYBACK_8)
 366                 return 0;
 367         ptr = snd_dma_pointer(chip->dma8, chip->p_dma_size);
 368         return bytes_to_frames(substream->runtime, ptr);
 369 }
 370
 371 static snd_pcm_uframes_t snd_sb8_capture_pointer(struct snd_pcm_substream *substream)
 372 {
 373         struct snd_sb *chip = snd_pcm_substream_chip(substream);
 374         size_t ptr;
 375
 376         if (chip->mode != SB_MODE_CAPTURE_8)
 377                 return 0;
 378         ptr = snd_dma_pointer(chip->dma8, chip->c_dma_size);
 379         return bytes_to_frames(substream->runtime, ptr);
 380 }
 381
 382 /*
 383
 384  */
 385
 386 static struct snd_pcm_hardware snd_sb8_playback =
 387 {
 388         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 389                                  SNDRV_PCM_INFO_MMAP_VALID),
 390         .formats =               SNDRV_PCM_FMTBIT_U8,
 391         .rates =                (SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000 |
 392                                  SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_22050),
 393         .rate_min =             4000,
 394         .rate_max =             23000,
 395         .channels_min =         1,
 396         .channels_max =         1,
 397         .buffer_bytes_max =     65536,
 398         .period_bytes_min =     64,
 399         .period_bytes_max =     65536,
 400         .periods_min =          1,
 401         .periods_max =          1024,
 402         .fifo_size =            0,
 403 };
 404
 405 static struct snd_pcm_hardware snd_sb8_capture =
 406 {
 407         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 408                                  SNDRV_PCM_INFO_MMAP_VALID),
 409         .formats =              SNDRV_PCM_FMTBIT_U8,
 410         .rates =                (SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000 |
 411                                  SNDRV_PCM_RATE_11025),
 412         .rate_min =             4000,
 413         .rate_max =             13000,
 414         .channels_min =         1,
 415         .channels_max =         1,
 416         .buffer_bytes_max =     65536,
 417         .period_bytes_min =     64,
 418         .period_bytes_max =     65536,
 419         .periods_min =          1,
 420         .periods_max =          1024,
 421         .fifo_size =            0,
 422 };
 423
 424 /*
 425  *
 426  */
 427
 428 static int snd_sb8_open(struct snd_pcm_substream *substream)
 429 {
 430         struct snd_sb *chip = snd_pcm_substream_chip(substream);
 431         struct snd_pcm_runtime *runtime = substream->runtime;
 432         unsigned long flags;
 433
 434         spin_lock_irqsave(&chip->open_lock, flags);
 435         if (chip->open) {
 436                 spin_unlock_irqrestore(&chip->open_lock, flags);
 437                 return -EAGAIN;
 438         }
 439         chip->open |= SB_OPEN_PCM;
 440         spin_unlock_irqrestore(&chip->open_lock, flags);
 441         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 442                 chip->playback_substream = substream;
 443                 runtime->hw = snd_sb8_playback;
 444         } else {
 445                 chip->capture_substream = substream;
 446                 runtime->hw = snd_sb8_capture;
 447         }
 448         switch (chip->hardware) {
 449         case SB_HW_PRO:
 450                 runtime->hw.rate_max = 44100;
 451                 runtime->hw.channels_max = 2;
 452                 snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 453                                     snd_sb8_hw_constraint_rate_channels, NULL,
 454                                     SNDRV_PCM_HW_PARAM_CHANNELS,
 455                                     SNDRV_PCM_HW_PARAM_RATE, -1);
 456                 snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 457                                      snd_sb8_hw_constraint_channels_rate, NULL,
 458                                      SNDRV_PCM_HW_PARAM_RATE, -1);
 459                 break;
 460         case SB_HW_201:
 461                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 462                         runtime->hw.rate_max = 44100;
 463                 } else {
 464                         runtime->hw.rate_max = 15000;
 465                 }
 466         default:
 467                 break;
 468         }
 469         snd_pcm_hw_constraint_ratnums(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 470                                       &hw_constraints_clock);
 471         return 0;
 472 }
 473
 474 static int snd_sb8_close(struct snd_pcm_substream *substream)
 475 {
 476         unsigned long flags;
 477         struct snd_sb *chip = snd_pcm_substream_chip(substream);
 478
 479         chip->playback_substream = NULL;
 480         chip->capture_substream = NULL;
 481         spin_lock_irqsave(&chip->open_lock, flags);
 482         chip->open &= ~SB_OPEN_PCM;
 483         spin_unlock_irqrestore(&chip->open_lock, flags);
 484         return 0;
 485 }
 486
 487 /*
 488  *  Initialization part
 489  */
 490
 491 static struct snd_pcm_ops snd_sb8_playback_ops = {
 492         .open =                 snd_sb8_open,
 493         .close =                snd_sb8_close,
 494         .ioctl =                snd_pcm_lib_ioctl,
 495         .hw_params =            snd_sb8_hw_params,
 496         .hw_free =              snd_sb8_hw_free,
 497         .prepare =              snd_sb8_playback_prepare,
 498         .trigger =              snd_sb8_playback_trigger,
 499         .pointer =              snd_sb8_playback_pointer,
 500 };
 501
 502 static struct snd_pcm_ops snd_sb8_capture_ops = {
 503         .open =                 snd_sb8_open,
 504         .close =                snd_sb8_close,
 505         .ioctl =                snd_pcm_lib_ioctl,
 506         .hw_params =            snd_sb8_hw_params,
 507         .hw_free =              snd_sb8_hw_free,
 508         .prepare =              snd_sb8_capture_prepare,
 509         .trigger =              snd_sb8_capture_trigger,
 510         .pointer =              snd_sb8_capture_pointer,
 511 };
 512
 513 int snd_sb8dsp_pcm(struct snd_sb *chip, int device, struct snd_pcm ** rpcm)
 514 {
 515         struct snd_card *card = chip->card;
 516         struct snd_pcm *pcm;
 517         int err;
 518
 519         if (rpcm)
 520                 *rpcm = NULL;
 521         if ((err = snd_pcm_new(card, "SB8 DSP", device, 1, 1, &pcm)) < 0)
 522                 return err;
 523         sprintf(pcm->name, "DSP v%i.%i", chip->version >> 8, chip->version & 0xff);
 524         pcm->info_flags = SNDRV_PCM_INFO_HALF_DUPLEX;
 525         pcm->private_data = chip;
 526
 527         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_sb8_playback_ops);
 528         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_sb8_capture_ops);
 529
 530         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
 531                                               snd_dma_isa_data(),
 532                                               64*1024, 64*1024);
 533
 534         if (rpcm)
 535                 *rpcm = pcm;
 536         return 0;
 537 }
 538
 539 EXPORT_SYMBOL(snd_sb8dsp_pcm);
 540 EXPORT_SYMBOL(snd_sb8dsp_interrupt);
 541   /* sb8_midi.c */
 542 EXPORT_SYMBOL(snd_sb8dsp_midi_interrupt);
 543 EXPORT_SYMBOL(snd_sb8dsp_midi);
 544
 545 /*
 546  *  INIT part
 547  */
 548
 549 static int __init alsa_sb8_init(void)
 550 {
 551         return 0;
 552 }
 553
 554 static void __exit alsa_sb8_exit(void)
 555 {
 556 }
 557
 558 module_init(alsa_sb8_init)
 559 module_exit(alsa_sb8_exit)