sound/isa/sb/sb8_main.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *                   Uros Bizjak <uros@kss-loka.si>
   5  *
   6  *  Routines for control of 8-bit SoundBlaster cards and clones
   7  *  Please note: I don't have access to old SB8 soundcards.
   8  *
   9  * --
  10  *
  11  * Thu Apr 29 20:36:17 BST 1999 George David Morrison <gdm@gedamo.demon.co.uk>
  12  *   DSP can't respond to commands whilst in "high speed" mode. Caused
  13  *   glitching during playback. Fixed.
  14  *
  15  * Wed Jul 12 22:02:55 CEST 2000 Uros Bizjak <uros@kss-loka.si>
  16  *   Cleaned up and rewrote lowlevel routines.
  17  */
  18
  19 #include <linux/io.h>
  20 #include <asm/dma.h>
  21 #include <linux/init.h>
  22 #include <linux/time.h>
  23 #include <linux/module.h>
  24 #include <sound/core.h>
  25 #include <sound/sb.h>
  26
  27 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Uros Bizjak <uros@kss-loka.si>");
  28 MODULE_DESCRIPTION("Routines for control of 8-bit SoundBlaster cards and clones");
  29 MODULE_LICENSE("GPL");
  30
  31 #define SB8_CLOCK       1000000
  32 #define SB8_DEN(v)      ((SB8_CLOCK + (v) / 2) / (v))
  33 #define SB8_RATE(v)     (SB8_CLOCK / SB8_DEN(v))
  34
  35 static const struct snd_ratnum clock = {
  36         .num = SB8_CLOCK,
  37         .den_min = 1,
  38         .den_max = 256,
  39         .den_step = 1,
  40 };
  41
  42 static const struct snd_pcm_hw_constraint_ratnums hw_constraints_clock = {
  43         .nrats = 1,
  44         .rats = &clock,
  45 };
  46
  47 static const struct snd_ratnum stereo_clocks[] = {
  48         {
  49                 .num = SB8_CLOCK,
  50                 .den_min = SB8_DEN(22050),
  51                 .den_max = SB8_DEN(22050),
  52                 .den_step = 1,
  53         },
  54         {
  55                 .num = SB8_CLOCK,
  56                 .den_min = SB8_DEN(11025),
  57                 .den_max = SB8_DEN(11025),
  58                 .den_step = 1,
  59         }
  60 };
  61
  62 static int snd_sb8_hw_constraint_rate_channels(struct snd_pcm_hw_params *params,
  63                                                struct snd_pcm_hw_rule *rule)
  64 {
  65         struct snd_interval *c = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
  66         if (c->min > 1) {
  67                 unsigned int num = 0, den = 0;
  68                 int err = snd_interval_ratnum(hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE),
  69                                           2, stereo_clocks, &num, &den);
  70                 if (err >= 0 && den) {
  71                         params->rate_num = num;
  72                         params->rate_den = den;
  73                 }
  74                 return err;
  75         }
  76         return 0;
  77 }
  78
  79 static int snd_sb8_hw_constraint_channels_rate(struct snd_pcm_hw_params *params,
  80                                                struct snd_pcm_hw_rule *rule)
  81 {
  82         struct snd_interval *r = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
  83         if (r->min > SB8_RATE(22050) || r->max <= SB8_RATE(11025)) {
  84                 struct snd_interval t = { .min = 1, .max = 1 };
  85                 return snd_interval_refine(hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS), &t);
  86         }
  87         return 0;
  88 }
  89
  90 static int snd_sb8_playback_prepare(struct snd_pcm_substream *substream)
  91 {
  92         unsigned long flags;
  93         struct snd_sb *chip = snd_pcm_substream_chip(substream);
  94         struct snd_pcm_runtime *runtime = substream->runtime;
  95         unsigned int mixreg, rate, size, count;
  96         unsigned char format;
  97         unsigned char stereo = runtime->channels > 1;
  98         int dma;
  99
 100         rate = runtime->rate;
 101         switch (chip->hardware) {
 102         case SB_HW_JAZZ16:
 103                 if (runtime->format == SNDRV_PCM_FORMAT_S16_LE) {
 104                         if (chip->mode & SB_MODE_CAPTURE_16)
 105                                 return -EBUSY;
 106                         else
 107                                 chip->mode |= SB_MODE_PLAYBACK_16;
 108                 }
 109                 chip->playback_format = SB_DSP_LO_OUTPUT_AUTO;
 110                 break;
 111         case SB_HW_PRO:
 112                 if (runtime->channels > 1) {
 113                         if (snd_BUG_ON(rate != SB8_RATE(11025) &&
 114                                        rate != SB8_RATE(22050)))
 115                                 return -EINVAL;
 116                         chip->playback_format = SB_DSP_HI_OUTPUT_AUTO;
 117                         break;
 118                 }
 119                 fallthrough;
 120         case SB_HW_201:
 121                 if (rate > 23000) {
 122                         chip->playback_format = SB_DSP_HI_OUTPUT_AUTO;
 123                         break;
 124                 }
 125                 fallthrough;
 126         case SB_HW_20:
 127                 chip->playback_format = SB_DSP_LO_OUTPUT_AUTO;
 128                 break;
 129         case SB_HW_10:
 130                 chip->playback_format = SB_DSP_OUTPUT;
 131                 break;
 132         default:
 133                 return -EINVAL;
 134         }
 135         if (chip->mode & SB_MODE_PLAYBACK_16) {
 136                 format = stereo ? SB_DSP_STEREO_16BIT : SB_DSP_MONO_16BIT;
 137                 dma = chip->dma16;
 138         } else {
 139                 format = stereo ? SB_DSP_STEREO_8BIT : SB_DSP_MONO_8BIT;
 140                 chip->mode |= SB_MODE_PLAYBACK_8;
 141                 dma = chip->dma8;
 142         }
 143         size = chip->p_dma_size = snd_pcm_lib_buffer_bytes(substream);
 144         count = chip->p_period_size = snd_pcm_lib_period_bytes(substream);
 145         spin_lock_irqsave(&chip->reg_lock, flags);
 146         snd_sbdsp_command(chip, SB_DSP_SPEAKER_ON);
 147         if (chip->hardware == SB_HW_JAZZ16)
 148                 snd_sbdsp_command(chip, format);
 149         else if (stereo) {
 150                 /* set playback stereo mode */
 151                 spin_lock(&chip->mixer_lock);
 152                 mixreg = snd_sbmixer_read(chip, SB_DSP_STEREO_SW);
 153                 snd_sbmixer_write(chip, SB_DSP_STEREO_SW, mixreg | 0x02);
 154                 spin_unlock(&chip->mixer_lock);
 155
 156                 /* Soundblaster hardware programming reference guide, 3-23 */
 157                 snd_sbdsp_command(chip, SB_DSP_DMA8_EXIT);
 158                 runtime->dma_area[0] = 0x80;
 159                 snd_dma_program(dma, runtime->dma_addr, 1, DMA_MODE_WRITE);
 160                 /* force interrupt */
 161                 snd_sbdsp_command(chip, SB_DSP_OUTPUT);
 162                 snd_sbdsp_command(chip, 0);
 163                 snd_sbdsp_command(chip, 0);
 164         }
 165         snd_sbdsp_command(chip, SB_DSP_SAMPLE_RATE);
 166         if (stereo) {
 167                 snd_sbdsp_command(chip, 256 - runtime->rate_den / 2);
 168                 spin_lock(&chip->mixer_lock);
 169                 /* save output filter status and turn it off */
 170                 mixreg = snd_sbmixer_read(chip, SB_DSP_PLAYBACK_FILT);
 171                 snd_sbmixer_write(chip, SB_DSP_PLAYBACK_FILT, mixreg | 0x20);
 172                 spin_unlock(&chip->mixer_lock);
 173                 /* just use force_mode16 for temporary storate... */
 174                 chip->force_mode16 = mixreg;
 175         } else {
 176                 snd_sbdsp_command(chip, 256 - runtime->rate_den);
 177         }
 178         if (chip->playback_format != SB_DSP_OUTPUT) {
 179                 if (chip->mode & SB_MODE_PLAYBACK_16)
 180                         count /= 2;
 181                 count--;
 182                 snd_sbdsp_command(chip, SB_DSP_BLOCK_SIZE);
 183                 snd_sbdsp_command(chip, count & 0xff);
 184                 snd_sbdsp_command(chip, count >> 8);
 185         }
 186         spin_unlock_irqrestore(&chip->reg_lock, flags);
 187         snd_dma_program(dma, runtime->dma_addr,
 188                         size, DMA_MODE_WRITE | DMA_AUTOINIT);
 189         return 0;
 190 }
 191
 192 static int snd_sb8_playback_trigger(struct snd_pcm_substream *substream,
 193                                     int cmd)
 194 {
 195         unsigned long flags;
 196         struct snd_sb *chip = snd_pcm_substream_chip(substream);
 197         unsigned int count;
 198
 199         spin_lock_irqsave(&chip->reg_lock, flags);
 200         switch (cmd) {
 201         case SNDRV_PCM_TRIGGER_START:
 202                 snd_sbdsp_command(chip, chip->playback_format);
 203                 if (chip->playback_format == SB_DSP_OUTPUT) {
 204                         count = chip->p_period_size - 1;
 205                         snd_sbdsp_command(chip, count & 0xff);
 206                         snd_sbdsp_command(chip, count >> 8);
 207                 }
 208                 break;
 209         case SNDRV_PCM_TRIGGER_STOP:
 210                 if (chip->playback_format == SB_DSP_HI_OUTPUT_AUTO) {
 211                         struct snd_pcm_runtime *runtime = substream->runtime;
 212                         snd_sbdsp_reset(chip);
 213                         if (runtime->channels > 1) {
 214                                 spin_lock(&chip->mixer_lock);
 215                                 /* restore output filter and set hardware to mono mode */
 216                                 snd_sbmixer_write(chip, SB_DSP_STEREO_SW, chip->force_mode16 & ~0x02);
 217                                 spin_unlock(&chip->mixer_lock);
 218                         }
 219                 } else {
 220                         snd_sbdsp_command(chip, SB_DSP_DMA8_OFF);
 221                 }
 222                 snd_sbdsp_command(chip, SB_DSP_SPEAKER_OFF);
 223         }
 224         spin_unlock_irqrestore(&chip->reg_lock, flags);
 225         return 0;
 226 }
 227
 228 static int snd_sb8_capture_prepare(struct snd_pcm_substream *substream)
 229 {
 230         unsigned long flags;
 231         struct snd_sb *chip = snd_pcm_substream_chip(substream);
 232         struct snd_pcm_runtime *runtime = substream->runtime;
 233         unsigned int mixreg, rate, size, count;
 234         unsigned char format;
 235         unsigned char stereo = runtime->channels > 1;
 236         int dma;
 237
 238         rate = runtime->rate;
 239         switch (chip->hardware) {
 240         case SB_HW_JAZZ16:
 241                 if (runtime->format == SNDRV_PCM_FORMAT_S16_LE) {
 242                         if (chip->mode & SB_MODE_PLAYBACK_16)
 243                                 return -EBUSY;
 244                         else
 245                                 chip->mode |= SB_MODE_CAPTURE_16;
 246                 }
 247                 chip->capture_format = SB_DSP_LO_INPUT_AUTO;
 248                 break;
 249         case SB_HW_PRO:
 250                 if (runtime->channels > 1) {
 251                         if (snd_BUG_ON(rate != SB8_RATE(11025) &&
 252                                        rate != SB8_RATE(22050)))
 253                                 return -EINVAL;
 254                         chip->capture_format = SB_DSP_HI_INPUT_AUTO;
 255                         break;
 256                 }
 257                 chip->capture_format = (rate > 23000) ? SB_DSP_HI_INPUT_AUTO : SB_DSP_LO_INPUT_AUTO;
 258                 break;
 259         case SB_HW_201:
 260                 if (rate > 13000) {
 261                         chip->capture_format = SB_DSP_HI_INPUT_AUTO;
 262                         break;
 263                 }
 264                 fallthrough;
 265         case SB_HW_20:
 266                 chip->capture_format = SB_DSP_LO_INPUT_AUTO;
 267                 break;
 268         case SB_HW_10:
 269                 chip->capture_format = SB_DSP_INPUT;
 270                 break;
 271         default:
 272                 return -EINVAL;
 273         }
 274         if (chip->mode & SB_MODE_CAPTURE_16) {
 275                 format = stereo ? SB_DSP_STEREO_16BIT : SB_DSP_MONO_16BIT;
 276                 dma = chip->dma16;
 277         } else {
 278                 format = stereo ? SB_DSP_STEREO_8BIT : SB_DSP_MONO_8BIT;
 279                 chip->mode |= SB_MODE_CAPTURE_8;
 280                 dma = chip->dma8;
 281         }
 282         size = chip->c_dma_size = snd_pcm_lib_buffer_bytes(substream);
 283         count = chip->c_period_size = snd_pcm_lib_period_bytes(substream);
 284         spin_lock_irqsave(&chip->reg_lock, flags);
 285         snd_sbdsp_command(chip, SB_DSP_SPEAKER_OFF);
 286         if (chip->hardware == SB_HW_JAZZ16)
 287                 snd_sbdsp_command(chip, format);
 288         else if (stereo)
 289                 snd_sbdsp_command(chip, SB_DSP_STEREO_8BIT);
 290         snd_sbdsp_command(chip, SB_DSP_SAMPLE_RATE);
 291         if (stereo) {
 292                 snd_sbdsp_command(chip, 256 - runtime->rate_den / 2);
 293                 spin_lock(&chip->mixer_lock);
 294                 /* save input filter status and turn it off */
 295                 mixreg = snd_sbmixer_read(chip, SB_DSP_CAPTURE_FILT);
 296                 snd_sbmixer_write(chip, SB_DSP_CAPTURE_FILT, mixreg | 0x20);
 297                 spin_unlock(&chip->mixer_lock);
 298                 /* just use force_mode16 for temporary storate... */
 299                 chip->force_mode16 = mixreg;
 300         } else {
 301                 snd_sbdsp_command(chip, 256 - runtime->rate_den);
 302         }
 303         if (chip->capture_format != SB_DSP_INPUT) {
 304                 if (chip->mode & SB_MODE_PLAYBACK_16)
 305                         count /= 2;
 306                 count--;
 307                 snd_sbdsp_command(chip, SB_DSP_BLOCK_SIZE);
 308                 snd_sbdsp_command(chip, count & 0xff);
 309                 snd_sbdsp_command(chip, count >> 8);
 310         }
 311         spin_unlock_irqrestore(&chip->reg_lock, flags);
 312         snd_dma_program(dma, runtime->dma_addr,
 313                         size, DMA_MODE_READ | DMA_AUTOINIT);
 314         return 0;
 315 }
 316
 317 static int snd_sb8_capture_trigger(struct snd_pcm_substream *substream,
 318                                    int cmd)
 319 {
 320         unsigned long flags;
 321         struct snd_sb *chip = snd_pcm_substream_chip(substream);
 322         unsigned int count;
 323
 324         spin_lock_irqsave(&chip->reg_lock, flags);
 325         switch (cmd) {
 326         case SNDRV_PCM_TRIGGER_START:
 327                 snd_sbdsp_command(chip, chip->capture_format);
 328                 if (chip->capture_format == SB_DSP_INPUT) {
 329                         count = chip->c_period_size - 1;
 330                         snd_sbdsp_command(chip, count & 0xff);
 331                         snd_sbdsp_command(chip, count >> 8);
 332                 }
 333                 break;
 334         case SNDRV_PCM_TRIGGER_STOP:
 335                 if (chip->capture_format == SB_DSP_HI_INPUT_AUTO) {
 336                         struct snd_pcm_runtime *runtime = substream->runtime;
 337                         snd_sbdsp_reset(chip);
 338                         if (runtime->channels > 1) {
 339                                 /* restore input filter status */
 340                                 spin_lock(&chip->mixer_lock);
 341                                 snd_sbmixer_write(chip, SB_DSP_CAPTURE_FILT, chip->force_mode16);
 342                                 spin_unlock(&chip->mixer_lock);
 343                                 /* set hardware to mono mode */
 344                                 snd_sbdsp_command(chip, SB_DSP_MONO_8BIT);
 345                         }
 346                 } else {
 347                         snd_sbdsp_command(chip, SB_DSP_DMA8_OFF);
 348                 }
 349                 snd_sbdsp_command(chip, SB_DSP_SPEAKER_OFF);
 350         }
 351         spin_unlock_irqrestore(&chip->reg_lock, flags);
 352         return 0;
 353 }
 354
 355 irqreturn_t snd_sb8dsp_interrupt(struct snd_sb *chip)
 356 {
 357         struct snd_pcm_substream *substream;
 358
 359         snd_sb_ack_8bit(chip);
 360         switch (chip->mode) {
 361         case SB_MODE_PLAYBACK_16:       /* ok.. playback is active */
 362                 if (chip->hardware != SB_HW_JAZZ16)
 363                         break;
 364                 fallthrough;
 365         case SB_MODE_PLAYBACK_8:
 366                 substream = chip->playback_substream;
 367                 if (chip->playback_format == SB_DSP_OUTPUT)
 368                         snd_sb8_playback_trigger(substream, SNDRV_PCM_TRIGGER_START);
 369                 snd_pcm_period_elapsed(substream);
 370                 break;
 371         case SB_MODE_CAPTURE_16:
 372                 if (chip->hardware != SB_HW_JAZZ16)
 373                         break;
 374                 fallthrough;
 375         case SB_MODE_CAPTURE_8:
 376                 substream = chip->capture_substream;
 377                 if (chip->capture_format == SB_DSP_INPUT)
 378                         snd_sb8_capture_trigger(substream, SNDRV_PCM_TRIGGER_START);
 379                 snd_pcm_period_elapsed(substream);
 380                 break;
 381         }
 382         return IRQ_HANDLED;
 383 }
 384
 385 static snd_pcm_uframes_t snd_sb8_playback_pointer(struct snd_pcm_substream *substream)
 386 {
 387         struct snd_sb *chip = snd_pcm_substream_chip(substream);
 388         size_t ptr;
 389         int dma;
 390
 391         if (chip->mode & SB_MODE_PLAYBACK_8)
 392                 dma = chip->dma8;
 393         else if (chip->mode & SB_MODE_PLAYBACK_16)
 394                 dma = chip->dma16;
 395         else
 396                 return 0;
 397         ptr = snd_dma_pointer(dma, chip->p_dma_size);
 398         return bytes_to_frames(substream->runtime, ptr);
 399 }
 400
 401 static snd_pcm_uframes_t snd_sb8_capture_pointer(struct snd_pcm_substream *substream)
 402 {
 403         struct snd_sb *chip = snd_pcm_substream_chip(substream);
 404         size_t ptr;
 405         int dma;
 406
 407         if (chip->mode & SB_MODE_CAPTURE_8)
 408                 dma = chip->dma8;
 409         else if (chip->mode & SB_MODE_CAPTURE_16)
 410                 dma = chip->dma16;
 411         else
 412                 return 0;
 413         ptr = snd_dma_pointer(dma, chip->c_dma_size);
 414         return bytes_to_frames(substream->runtime, ptr);
 415 }
 416
 417 /*
 418
 419  */
 420
 421 static const struct snd_pcm_hardware snd_sb8_playback =
 422 {
 423         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 424                                  SNDRV_PCM_INFO_MMAP_VALID),
 425         .formats =               SNDRV_PCM_FMTBIT_U8,
 426         .rates =                (SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000 |
 427                                  SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_22050),
 428         .rate_min =             4000,
 429         .rate_max =             23000,
 430         .channels_min =         1,
 431         .channels_max =         1,
 432         .buffer_bytes_max =     65536,
 433         .period_bytes_min =     64,
 434         .period_bytes_max =     65536,
 435         .periods_min =          1,
 436         .periods_max =          1024,
 437         .fifo_size =            0,
 438 };
 439
 440 static const struct snd_pcm_hardware snd_sb8_capture =
 441 {
 442         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 443                                  SNDRV_PCM_INFO_MMAP_VALID),
 444         .formats =              SNDRV_PCM_FMTBIT_U8,
 445         .rates =                (SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000 |
 446                                  SNDRV_PCM_RATE_11025),
 447         .rate_min =             4000,
 448         .rate_max =             13000,
 449         .channels_min =         1,
 450         .channels_max =         1,
 451         .buffer_bytes_max =     65536,
 452         .period_bytes_min =     64,
 453         .period_bytes_max =     65536,
 454         .periods_min =          1,
 455         .periods_max =          1024,
 456         .fifo_size =            0,
 457 };
 458
 459 /*
 460  *
 461  */
 462
 463 static int snd_sb8_open(struct snd_pcm_substream *substream)
 464 {
 465         struct snd_sb *chip = snd_pcm_substream_chip(substream);
 466         struct snd_pcm_runtime *runtime = substream->runtime;
 467         unsigned long flags;
 468
 469         spin_lock_irqsave(&chip->open_lock, flags);
 470         if (chip->open) {
 471                 spin_unlock_irqrestore(&chip->open_lock, flags);
 472                 return -EAGAIN;
 473         }
 474         chip->open |= SB_OPEN_PCM;
 475         spin_unlock_irqrestore(&chip->open_lock, flags);
 476         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 477                 chip->playback_substream = substream;
 478                 runtime->hw = snd_sb8_playback;
 479         } else {
 480                 chip->capture_substream = substream;
 481                 runtime->hw = snd_sb8_capture;
 482         }
 483         switch (chip->hardware) {
 484         case SB_HW_JAZZ16:
 485                 if (chip->dma16 == 5 || chip->dma16 == 7)
 486                         runtime->hw.formats |= SNDRV_PCM_FMTBIT_S16_LE;
 487                 runtime->hw.rates |= SNDRV_PCM_RATE_8000_48000;
 488                 runtime->hw.rate_min = 4000;
 489                 runtime->hw.rate_max = 50000;
 490                 runtime->hw.channels_max = 2;
 491                 break;
 492         case SB_HW_PRO:
 493                 runtime->hw.rate_max = 44100;
 494                 runtime->hw.channels_max = 2;
 495                 snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 496                                     snd_sb8_hw_constraint_rate_channels, NULL,
 497                                     SNDRV_PCM_HW_PARAM_CHANNELS,
 498                                     SNDRV_PCM_HW_PARAM_RATE, -1);
 499                 snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 500                                      snd_sb8_hw_constraint_channels_rate, NULL,
 501                                      SNDRV_PCM_HW_PARAM_RATE, -1);
 502                 break;
 503         case SB_HW_201:
 504                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 505                         runtime->hw.rate_max = 44100;
 506                 } else {
 507                         runtime->hw.rate_max = 15000;
 508                 }
 509                 break;
 510         default:
 511                 break;
 512         }
 513         snd_pcm_hw_constraint_ratnums(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 514                                       &hw_constraints_clock);
 515         if (chip->dma8 > 3 || chip->dma16 >= 0) {
 516                 snd_pcm_hw_constraint_step(runtime, 0,
 517                                            SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2);
 518                 snd_pcm_hw_constraint_step(runtime, 0,
 519                                            SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 2);
 520                 runtime->hw.buffer_bytes_max = 128 * 1024 * 1024;
 521                 runtime->hw.period_bytes_max = 128 * 1024 * 1024;
 522         }
 523         return 0;
 524 }
 525
 526 static int snd_sb8_close(struct snd_pcm_substream *substream)
 527 {
 528         unsigned long flags;
 529         struct snd_sb *chip = snd_pcm_substream_chip(substream);
 530
 531         chip->playback_substream = NULL;
 532         chip->capture_substream = NULL;
 533         spin_lock_irqsave(&chip->open_lock, flags);
 534         chip->open &= ~SB_OPEN_PCM;
 535         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 536                 chip->mode &= ~SB_MODE_PLAYBACK;
 537         else
 538                 chip->mode &= ~SB_MODE_CAPTURE;
 539         spin_unlock_irqrestore(&chip->open_lock, flags);
 540         return 0;
 541 }
 542
 543 /*
 544  *  Initialization part
 545  */
 546
 547 static const struct snd_pcm_ops snd_sb8_playback_ops = {
 548         .open =                 snd_sb8_open,
 549         .close =                snd_sb8_close,
 550         .prepare =              snd_sb8_playback_prepare,
 551         .trigger =              snd_sb8_playback_trigger,
 552         .pointer =              snd_sb8_playback_pointer,
 553 };
 554
 555 static const struct snd_pcm_ops snd_sb8_capture_ops = {
 556         .open =                 snd_sb8_open,
 557         .close =                snd_sb8_close,
 558         .prepare =              snd_sb8_capture_prepare,
 559         .trigger =              snd_sb8_capture_trigger,
 560         .pointer =              snd_sb8_capture_pointer,
 561 };
 562
 563 int snd_sb8dsp_pcm(struct snd_sb *chip, int device)
 564 {
 565         struct snd_card *card = chip->card;
 566         struct snd_pcm *pcm;
 567         int err;
 568         size_t max_prealloc = 64 * 1024;
 569
 570         if ((err = snd_pcm_new(card, "SB8 DSP", device, 1, 1, &pcm)) < 0)
 571                 return err;
 572         sprintf(pcm->name, "DSP v%i.%i", chip->version >> 8, chip->version & 0xff);
 573         pcm->info_flags = SNDRV_PCM_INFO_HALF_DUPLEX;
 574         pcm->private_data = chip;
 575
 576         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_sb8_playback_ops);
 577         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_sb8_capture_ops);
 578
 579         if (chip->dma8 > 3 || chip->dma16 >= 0)
 580                 max_prealloc = 128 * 1024;
 581         snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV,
 582                                        card->dev, 64*1024, max_prealloc);
 583
 584         return 0;
 585 }
 586
 587 EXPORT_SYMBOL(snd_sb8dsp_pcm);
 588 EXPORT_SYMBOL(snd_sb8dsp_interrupt);
 589   /* sb8_midi.c */
 590 EXPORT_SYMBOL(snd_sb8dsp_midi_interrupt);
 591 EXPORT_SYMBOL(snd_sb8dsp_midi);