sound/drivers/dummy.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Dummy soundcard
   4  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   5  */
   6
   7 #include <linux/init.h>
   8 #include <linux/err.h>
   9 #include <linux/platform_device.h>
  10 #include <linux/jiffies.h>
  11 #include <linux/slab.h>
  12 #include <linux/time.h>
  13 #include <linux/wait.h>
  14 #include <linux/hrtimer.h>
  15 #include <linux/math64.h>
  16 #include <linux/module.h>
  17 #include <sound/core.h>
  18 #include <sound/control.h>
  19 #include <sound/tlv.h>
  20 #include <sound/pcm.h>
  21 #include <sound/rawmidi.h>
  22 #include <sound/info.h>
  23 #include <sound/initval.h>
  24
  25 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  26 MODULE_DESCRIPTION("Dummy soundcard (/dev/null)");
  27 MODULE_LICENSE("GPL");
  28
  29 #define MAX_PCM_DEVICES         4
  30 #define MAX_PCM_SUBSTREAMS      128
  31 #define MAX_MIDI_DEVICES        2
  32
  33 /* defaults */
  34 #define MAX_BUFFER_SIZE         (64*1024)
  35 #define MIN_PERIOD_SIZE         64
  36 #define MAX_PERIOD_SIZE         MAX_BUFFER_SIZE
  37 #define USE_FORMATS             (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)
  38 #define USE_RATE                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000
  39 #define USE_RATE_MIN            5500
  40 #define USE_RATE_MAX            48000
  41 #define USE_CHANNELS_MIN        1
  42 #define USE_CHANNELS_MAX        2
  43 #define USE_PERIODS_MIN         1
  44 #define USE_PERIODS_MAX         1024
  45
  46 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
  47 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
  48 static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
  49 static char *model[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = NULL};
  50 static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
  51 static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
  52 //static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
  53 #ifdef CONFIG_HIGH_RES_TIMERS
  54 static bool hrtimer = 1;
  55 #endif
  56 static bool fake_buffer = 1;
  57
  58 module_param_array(index, int, NULL, 0444);
  59 MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
  60 module_param_array(id, charp, NULL, 0444);
  61 MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
  62 module_param_array(enable, bool, NULL, 0444);
  63 MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
  64 module_param_array(model, charp, NULL, 0444);
  65 MODULE_PARM_DESC(model, "Soundcard model.");
  66 module_param_array(pcm_devs, int, NULL, 0444);
  67 MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
  68 module_param_array(pcm_substreams, int, NULL, 0444);
  69 MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-128) for dummy driver.");
  70 //module_param_array(midi_devs, int, NULL, 0444);
  71 //MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
  72 module_param(fake_buffer, bool, 0444);
  73 MODULE_PARM_DESC(fake_buffer, "Fake buffer allocations.");
  74 #ifdef CONFIG_HIGH_RES_TIMERS
  75 module_param(hrtimer, bool, 0644);
  76 MODULE_PARM_DESC(hrtimer, "Use hrtimer as the timer source.");
  77 #endif
  78
  79 static struct platform_device *devices[SNDRV_CARDS];
  80
  81 #define MIXER_ADDR_MASTER       0
  82 #define MIXER_ADDR_LINE         1
  83 #define MIXER_ADDR_MIC          2
  84 #define MIXER_ADDR_SYNTH        3
  85 #define MIXER_ADDR_CD           4
  86 #define MIXER_ADDR_LAST         4
  87
  88 struct dummy_timer_ops {
  89         int (*create)(struct snd_pcm_substream *);
  90         void (*free)(struct snd_pcm_substream *);
  91         int (*prepare)(struct snd_pcm_substream *);
  92         int (*start)(struct snd_pcm_substream *);
  93         int (*stop)(struct snd_pcm_substream *);
  94         snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *);
  95 };
  96
  97 #define get_dummy_ops(substream) \
  98         (*(const struct dummy_timer_ops **)(substream)->runtime->private_data)
  99
 100 struct dummy_model {
 101         const char *name;
 102         int (*playback_constraints)(struct snd_pcm_runtime *runtime);
 103         int (*capture_constraints)(struct snd_pcm_runtime *runtime);
 104         u64 formats;
 105         size_t buffer_bytes_max;
 106         size_t period_bytes_min;
 107         size_t period_bytes_max;
 108         unsigned int periods_min;
 109         unsigned int periods_max;
 110         unsigned int rates;
 111         unsigned int rate_min;
 112         unsigned int rate_max;
 113         unsigned int channels_min;
 114         unsigned int channels_max;
 115 };
 116
 117 struct snd_dummy {
 118         struct snd_card *card;
 119         const struct dummy_model *model;
 120         struct snd_pcm *pcm;
 121         struct snd_pcm_hardware pcm_hw;
 122         spinlock_t mixer_lock;
 123         int mixer_volume[MIXER_ADDR_LAST+1][2];
 124         int capture_source[MIXER_ADDR_LAST+1][2];
 125         int iobox;
 126         struct snd_kcontrol *cd_volume_ctl;
 127         struct snd_kcontrol *cd_switch_ctl;
 128 };
 129
 130 /*
 131  * card models
 132  */
 133
 134 static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime)
 135 {
 136         int err;
 137         err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 138         if (err < 0)
 139                 return err;
 140         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX);
 141         if (err < 0)
 142                 return err;
 143         return 0;
 144 }
 145
 146 static const struct dummy_model model_emu10k1 = {
 147         .name = "emu10k1",
 148         .playback_constraints = emu10k1_playback_constraints,
 149         .buffer_bytes_max = 128 * 1024,
 150 };
 151
 152 static const struct dummy_model model_rme9652 = {
 153         .name = "rme9652",
 154         .buffer_bytes_max = 26 * 64 * 1024,
 155         .formats = SNDRV_PCM_FMTBIT_S32_LE,
 156         .channels_min = 26,
 157         .channels_max = 26,
 158         .periods_min = 2,
 159         .periods_max = 2,
 160 };
 161
 162 static const struct dummy_model model_ice1712 = {
 163         .name = "ice1712",
 164         .buffer_bytes_max = 256 * 1024,
 165         .formats = SNDRV_PCM_FMTBIT_S32_LE,
 166         .channels_min = 10,
 167         .channels_max = 10,
 168         .periods_min = 1,
 169         .periods_max = 1024,
 170 };
 171
 172 static const struct dummy_model model_uda1341 = {
 173         .name = "uda1341",
 174         .buffer_bytes_max = 16380,
 175         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 176         .channels_min = 2,
 177         .channels_max = 2,
 178         .periods_min = 2,
 179         .periods_max = 255,
 180 };
 181
 182 static const struct dummy_model model_ac97 = {
 183         .name = "ac97",
 184         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 185         .channels_min = 2,
 186         .channels_max = 2,
 187         .rates = SNDRV_PCM_RATE_48000,
 188         .rate_min = 48000,
 189         .rate_max = 48000,
 190 };
 191
 192 static const struct dummy_model model_ca0106 = {
 193         .name = "ca0106",
 194         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 195         .buffer_bytes_max = ((65536-64)*8),
 196         .period_bytes_max = (65536-64),
 197         .periods_min = 2,
 198         .periods_max = 8,
 199         .channels_min = 2,
 200         .channels_max = 2,
 201         .rates = SNDRV_PCM_RATE_48000|SNDRV_PCM_RATE_96000|SNDRV_PCM_RATE_192000,
 202         .rate_min = 48000,
 203         .rate_max = 192000,
 204 };
 205
 206 static const struct dummy_model *dummy_models[] = {
 207         &model_emu10k1,
 208         &model_rme9652,
 209         &model_ice1712,
 210         &model_uda1341,
 211         &model_ac97,
 212         &model_ca0106,
 213         NULL
 214 };
 215
 216 /*
 217  * system timer interface
 218  */
 219
 220 struct dummy_systimer_pcm {
 221         /* ops must be the first item */
 222         const struct dummy_timer_ops *timer_ops;
 223         spinlock_t lock;
 224         struct timer_list timer;
 225         unsigned long base_time;
 226         unsigned int frac_pos;  /* fractional sample position (based HZ) */
 227         unsigned int frac_period_rest;
 228         unsigned int frac_buffer_size;  /* buffer_size * HZ */
 229         unsigned int frac_period_size;  /* period_size * HZ */
 230         unsigned int rate;
 231         int elapsed;
 232         struct snd_pcm_substream *substream;
 233 };
 234
 235 static void dummy_systimer_rearm(struct dummy_systimer_pcm *dpcm)
 236 {
 237         mod_timer(&dpcm->timer, jiffies +
 238                 DIV_ROUND_UP(dpcm->frac_period_rest, dpcm->rate));
 239 }
 240
 241 static void dummy_systimer_update(struct dummy_systimer_pcm *dpcm)
 242 {
 243         unsigned long delta;
 244
 245         delta = jiffies - dpcm->base_time;
 246         if (!delta)
 247                 return;
 248         dpcm->base_time += delta;
 249         delta *= dpcm->rate;
 250         dpcm->frac_pos += delta;
 251         while (dpcm->frac_pos >= dpcm->frac_buffer_size)
 252                 dpcm->frac_pos -= dpcm->frac_buffer_size;
 253         while (dpcm->frac_period_rest <= delta) {
 254                 dpcm->elapsed++;
 255                 dpcm->frac_period_rest += dpcm->frac_period_size;
 256         }
 257         dpcm->frac_period_rest -= delta;
 258 }
 259
 260 static int dummy_systimer_start(struct snd_pcm_substream *substream)
 261 {
 262         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
 263         spin_lock(&dpcm->lock);
 264         dpcm->base_time = jiffies;
 265         dummy_systimer_rearm(dpcm);
 266         spin_unlock(&dpcm->lock);
 267         return 0;
 268 }
 269
 270 static int dummy_systimer_stop(struct snd_pcm_substream *substream)
 271 {
 272         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
 273         spin_lock(&dpcm->lock);
 274         del_timer(&dpcm->timer);
 275         spin_unlock(&dpcm->lock);
 276         return 0;
 277 }
 278
 279 static int dummy_systimer_prepare(struct snd_pcm_substream *substream)
 280 {
 281         struct snd_pcm_runtime *runtime = substream->runtime;
 282         struct dummy_systimer_pcm *dpcm = runtime->private_data;
 283
 284         dpcm->frac_pos = 0;
 285         dpcm->rate = runtime->rate;
 286         dpcm->frac_buffer_size = runtime->buffer_size * HZ;
 287         dpcm->frac_period_size = runtime->period_size * HZ;
 288         dpcm->frac_period_rest = dpcm->frac_period_size;
 289         dpcm->elapsed = 0;
 290
 291         return 0;
 292 }
 293
 294 static void dummy_systimer_callback(struct timer_list *t)
 295 {
 296         struct dummy_systimer_pcm *dpcm = from_timer(dpcm, t, timer);
 297         unsigned long flags;
 298         int elapsed = 0;
 299
 300         spin_lock_irqsave(&dpcm->lock, flags);
 301         dummy_systimer_update(dpcm);
 302         dummy_systimer_rearm(dpcm);
 303         elapsed = dpcm->elapsed;
 304         dpcm->elapsed = 0;
 305         spin_unlock_irqrestore(&dpcm->lock, flags);
 306         if (elapsed)
 307                 snd_pcm_period_elapsed(dpcm->substream);
 308 }
 309
 310 static snd_pcm_uframes_t
 311 dummy_systimer_pointer(struct snd_pcm_substream *substream)
 312 {
 313         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
 314         snd_pcm_uframes_t pos;
 315
 316         spin_lock(&dpcm->lock);
 317         dummy_systimer_update(dpcm);
 318         pos = dpcm->frac_pos / HZ;
 319         spin_unlock(&dpcm->lock);
 320         return pos;
 321 }
 322
 323 static int dummy_systimer_create(struct snd_pcm_substream *substream)
 324 {
 325         struct dummy_systimer_pcm *dpcm;
 326
 327         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
 328         if (!dpcm)
 329                 return -ENOMEM;
 330         substream->runtime->private_data = dpcm;
 331         timer_setup(&dpcm->timer, dummy_systimer_callback, 0);
 332         spin_lock_init(&dpcm->lock);
 333         dpcm->substream = substream;
 334         return 0;
 335 }
 336
 337 static void dummy_systimer_free(struct snd_pcm_substream *substream)
 338 {
 339         kfree(substream->runtime->private_data);
 340 }
 341
 342 static const struct dummy_timer_ops dummy_systimer_ops = {
 343         .create =       dummy_systimer_create,
 344         .free =         dummy_systimer_free,
 345         .prepare =      dummy_systimer_prepare,
 346         .start =        dummy_systimer_start,
 347         .stop =         dummy_systimer_stop,
 348         .pointer =      dummy_systimer_pointer,
 349 };
 350
 351 #ifdef CONFIG_HIGH_RES_TIMERS
 352 /*
 353  * hrtimer interface
 354  */
 355
 356 struct dummy_hrtimer_pcm {
 357         /* ops must be the first item */
 358         const struct dummy_timer_ops *timer_ops;
 359         ktime_t base_time;
 360         ktime_t period_time;
 361         atomic_t running;
 362         struct hrtimer timer;
 363         struct snd_pcm_substream *substream;
 364 };
 365
 366 static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer)
 367 {
 368         struct dummy_hrtimer_pcm *dpcm;
 369
 370         dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer);
 371         if (!atomic_read(&dpcm->running))
 372                 return HRTIMER_NORESTART;
 373         /*
 374          * In cases of XRUN and draining, this calls .trigger to stop PCM
 375          * substream.
 376          */
 377         snd_pcm_period_elapsed(dpcm->substream);
 378         if (!atomic_read(&dpcm->running))
 379                 return HRTIMER_NORESTART;
 380
 381         hrtimer_forward_now(timer, dpcm->period_time);
 382         return HRTIMER_RESTART;
 383 }
 384
 385 static int dummy_hrtimer_start(struct snd_pcm_substream *substream)
 386 {
 387         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
 388
 389         dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer);
 390         hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL_SOFT);
 391         atomic_set(&dpcm->running, 1);
 392         return 0;
 393 }
 394
 395 static int dummy_hrtimer_stop(struct snd_pcm_substream *substream)
 396 {
 397         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
 398
 399         atomic_set(&dpcm->running, 0);
 400         if (!hrtimer_callback_running(&dpcm->timer))
 401                 hrtimer_cancel(&dpcm->timer);
 402         return 0;
 403 }
 404
 405 static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
 406 {
 407         hrtimer_cancel(&dpcm->timer);
 408 }
 409
 410 static snd_pcm_uframes_t
 411 dummy_hrtimer_pointer(struct snd_pcm_substream *substream)
 412 {
 413         struct snd_pcm_runtime *runtime = substream->runtime;
 414         struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
 415         u64 delta;
 416         u32 pos;
 417
 418         delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer),
 419                                dpcm->base_time);
 420         delta = div_u64(delta * runtime->rate + 999999, 1000000);
 421         div_u64_rem(delta, runtime->buffer_size, &pos);
 422         return pos;
 423 }
 424
 425 static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream)
 426 {
 427         struct snd_pcm_runtime *runtime = substream->runtime;
 428         struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
 429         unsigned int period, rate;
 430         long sec;
 431         unsigned long nsecs;
 432
 433         dummy_hrtimer_sync(dpcm);
 434         period = runtime->period_size;
 435         rate = runtime->rate;
 436         sec = period / rate;
 437         period %= rate;
 438         nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate);
 439         dpcm->period_time = ktime_set(sec, nsecs);
 440
 441         return 0;
 442 }
 443
 444 static int dummy_hrtimer_create(struct snd_pcm_substream *substream)
 445 {
 446         struct dummy_hrtimer_pcm *dpcm;
 447
 448         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
 449         if (!dpcm)
 450                 return -ENOMEM;
 451         substream->runtime->private_data = dpcm;
 452         hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_SOFT);
 453         dpcm->timer.function = dummy_hrtimer_callback;
 454         dpcm->substream = substream;
 455         atomic_set(&dpcm->running, 0);
 456         return 0;
 457 }
 458
 459 static void dummy_hrtimer_free(struct snd_pcm_substream *substream)
 460 {
 461         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
 462         dummy_hrtimer_sync(dpcm);
 463         kfree(dpcm);
 464 }
 465
 466 static const struct dummy_timer_ops dummy_hrtimer_ops = {
 467         .create =       dummy_hrtimer_create,
 468         .free =         dummy_hrtimer_free,
 469         .prepare =      dummy_hrtimer_prepare,
 470         .start =        dummy_hrtimer_start,
 471         .stop =         dummy_hrtimer_stop,
 472         .pointer =      dummy_hrtimer_pointer,
 473 };
 474
 475 #endif /* CONFIG_HIGH_RES_TIMERS */
 476
 477 /*
 478  * PCM interface
 479  */
 480
 481 static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 482 {
 483         switch (cmd) {
 484         case SNDRV_PCM_TRIGGER_START:
 485         case SNDRV_PCM_TRIGGER_RESUME:
 486                 return get_dummy_ops(substream)->start(substream);
 487         case SNDRV_PCM_TRIGGER_STOP:
 488         case SNDRV_PCM_TRIGGER_SUSPEND:
 489                 return get_dummy_ops(substream)->stop(substream);
 490         }
 491         return -EINVAL;
 492 }
 493
 494 static int dummy_pcm_prepare(struct snd_pcm_substream *substream)
 495 {
 496         return get_dummy_ops(substream)->prepare(substream);
 497 }
 498
 499 static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream)
 500 {
 501         return get_dummy_ops(substream)->pointer(substream);
 502 }
 503
 504 static const struct snd_pcm_hardware dummy_pcm_hardware = {
 505         .info =                 (SNDRV_PCM_INFO_MMAP |
 506                                  SNDRV_PCM_INFO_INTERLEAVED |
 507                                  SNDRV_PCM_INFO_RESUME |
 508                                  SNDRV_PCM_INFO_MMAP_VALID),
 509         .formats =              USE_FORMATS,
 510         .rates =                USE_RATE,
 511         .rate_min =             USE_RATE_MIN,
 512         .rate_max =             USE_RATE_MAX,
 513         .channels_min =         USE_CHANNELS_MIN,
 514         .channels_max =         USE_CHANNELS_MAX,
 515         .buffer_bytes_max =     MAX_BUFFER_SIZE,
 516         .period_bytes_min =     MIN_PERIOD_SIZE,
 517         .period_bytes_max =     MAX_PERIOD_SIZE,
 518         .periods_min =          USE_PERIODS_MIN,
 519         .periods_max =          USE_PERIODS_MAX,
 520         .fifo_size =            0,
 521 };
 522
 523 static int dummy_pcm_hw_params(struct snd_pcm_substream *substream,
 524                                struct snd_pcm_hw_params *hw_params)
 525 {
 526         if (fake_buffer) {
 527                 /* runtime->dma_bytes has to be set manually to allow mmap */
 528                 substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
 529                 return 0;
 530         }
 531         return 0;
 532 }
 533
 534 static int dummy_pcm_open(struct snd_pcm_substream *substream)
 535 {
 536         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
 537         const struct dummy_model *model = dummy->model;
 538         struct snd_pcm_runtime *runtime = substream->runtime;
 539         const struct dummy_timer_ops *ops;
 540         int err;
 541
 542         ops = &dummy_systimer_ops;
 543 #ifdef CONFIG_HIGH_RES_TIMERS
 544         if (hrtimer)
 545                 ops = &dummy_hrtimer_ops;
 546 #endif
 547
 548         err = ops->create(substream);
 549         if (err < 0)
 550                 return err;
 551         get_dummy_ops(substream) = ops;
 552
 553         runtime->hw = dummy->pcm_hw;
 554         if (substream->pcm->device & 1) {
 555                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 556                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 557         }
 558         if (substream->pcm->device & 2)
 559                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
 560                                       SNDRV_PCM_INFO_MMAP_VALID);
 561
 562         if (model == NULL)
 563                 return 0;
 564
 565         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 566                 if (model->playback_constraints)
 567                         err = model->playback_constraints(substream->runtime);
 568         } else {
 569                 if (model->capture_constraints)
 570                         err = model->capture_constraints(substream->runtime);
 571         }
 572         if (err < 0) {
 573                 get_dummy_ops(substream)->free(substream);
 574                 return err;
 575         }
 576         return 0;
 577 }
 578
 579 static int dummy_pcm_close(struct snd_pcm_substream *substream)
 580 {
 581         get_dummy_ops(substream)->free(substream);
 582         return 0;
 583 }
 584
 585 /*
 586  * dummy buffer handling
 587  */
 588
 589 static void *dummy_page[2];
 590
 591 static void free_fake_buffer(void)
 592 {
 593         if (fake_buffer) {
 594                 int i;
 595                 for (i = 0; i < 2; i++)
 596                         if (dummy_page[i]) {
 597                                 free_page((unsigned long)dummy_page[i]);
 598                                 dummy_page[i] = NULL;
 599                         }
 600         }
 601 }
 602
 603 static int alloc_fake_buffer(void)
 604 {
 605         int i;
 606
 607         if (!fake_buffer)
 608                 return 0;
 609         for (i = 0; i < 2; i++) {
 610                 dummy_page[i] = (void *)get_zeroed_page(GFP_KERNEL);
 611                 if (!dummy_page[i]) {
 612                         free_fake_buffer();
 613                         return -ENOMEM;
 614                 }
 615         }
 616         return 0;
 617 }
 618
 619 static int dummy_pcm_copy(struct snd_pcm_substream *substream,
 620                           int channel, unsigned long pos,
 621                           void __user *dst, unsigned long bytes)
 622 {
 623         return 0; /* do nothing */
 624 }
 625
 626 static int dummy_pcm_copy_kernel(struct snd_pcm_substream *substream,
 627                                  int channel, unsigned long pos,
 628                                  void *dst, unsigned long bytes)
 629 {
 630         return 0; /* do nothing */
 631 }
 632
 633 static int dummy_pcm_silence(struct snd_pcm_substream *substream,
 634                              int channel, unsigned long pos,
 635                              unsigned long bytes)
 636 {
 637         return 0; /* do nothing */
 638 }
 639
 640 static struct page *dummy_pcm_page(struct snd_pcm_substream *substream,
 641                                    unsigned long offset)
 642 {
 643         return virt_to_page(dummy_page[substream->stream]); /* the same page */
 644 }
 645
 646 static const struct snd_pcm_ops dummy_pcm_ops = {
 647         .open =         dummy_pcm_open,
 648         .close =        dummy_pcm_close,
 649         .hw_params =    dummy_pcm_hw_params,
 650         .prepare =      dummy_pcm_prepare,
 651         .trigger =      dummy_pcm_trigger,
 652         .pointer =      dummy_pcm_pointer,
 653 };
 654
 655 static const struct snd_pcm_ops dummy_pcm_ops_no_buf = {
 656         .open =         dummy_pcm_open,
 657         .close =        dummy_pcm_close,
 658         .hw_params =    dummy_pcm_hw_params,
 659         .prepare =      dummy_pcm_prepare,
 660         .trigger =      dummy_pcm_trigger,
 661         .pointer =      dummy_pcm_pointer,
 662         .copy_user =    dummy_pcm_copy,
 663         .copy_kernel =  dummy_pcm_copy_kernel,
 664         .fill_silence = dummy_pcm_silence,
 665         .page =         dummy_pcm_page,
 666 };
 667
 668 static int snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
 669                               int substreams)
 670 {
 671         struct snd_pcm *pcm;
 672         const struct snd_pcm_ops *ops;
 673         int err;
 674
 675         err = snd_pcm_new(dummy->card, "Dummy PCM", device,
 676                                substreams, substreams, &pcm);
 677         if (err < 0)
 678                 return err;
 679         dummy->pcm = pcm;
 680         if (fake_buffer)
 681                 ops = &dummy_pcm_ops_no_buf;
 682         else
 683                 ops = &dummy_pcm_ops;
 684         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, ops);
 685         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, ops);
 686         pcm->private_data = dummy;
 687         pcm->info_flags = 0;
 688         strcpy(pcm->name, "Dummy PCM");
 689         if (!fake_buffer) {
 690                 snd_pcm_set_managed_buffer_all(pcm,
 691                         SNDRV_DMA_TYPE_CONTINUOUS,
 692                         NULL,
 693                         0, 64*1024);
 694         }
 695         return 0;
 696 }
 697
 698 /*
 699  * mixer interface
 700  */
 701
 702 #define DUMMY_VOLUME(xname, xindex, addr) \
 703 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
 704   .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
 705   .name = xname, .index = xindex, \
 706   .info = snd_dummy_volume_info, \
 707   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
 708   .private_value = addr, \
 709   .tlv = { .p = db_scale_dummy } }
 710
 711 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
 712                                  struct snd_ctl_elem_info *uinfo)
 713 {
 714         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 715         uinfo->count = 2;
 716         uinfo->value.integer.min = -50;
 717         uinfo->value.integer.max = 100;
 718         return 0;
 719 }
 720
 721 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
 722                                 struct snd_ctl_elem_value *ucontrol)
 723 {
 724         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 725         int addr = kcontrol->private_value;
 726
 727         spin_lock_irq(&dummy->mixer_lock);
 728         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
 729         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
 730         spin_unlock_irq(&dummy->mixer_lock);
 731         return 0;
 732 }
 733
 734 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
 735                                 struct snd_ctl_elem_value *ucontrol)
 736 {
 737         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 738         int change, addr = kcontrol->private_value;
 739         int left, right;
 740
 741         left = ucontrol->value.integer.value[0];
 742         if (left < -50)
 743                 left = -50;
 744         if (left > 100)
 745                 left = 100;
 746         right = ucontrol->value.integer.value[1];
 747         if (right < -50)
 748                 right = -50;
 749         if (right > 100)
 750                 right = 100;
 751         spin_lock_irq(&dummy->mixer_lock);
 752         change = dummy->mixer_volume[addr][0] != left ||
 753                  dummy->mixer_volume[addr][1] != right;
 754         dummy->mixer_volume[addr][0] = left;
 755         dummy->mixer_volume[addr][1] = right;
 756         spin_unlock_irq(&dummy->mixer_lock);
 757         return change;
 758 }
 759
 760 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
 761
 762 #define DUMMY_CAPSRC(xname, xindex, addr) \
 763 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 764   .info = snd_dummy_capsrc_info, \
 765   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
 766   .private_value = addr }
 767
 768 #define snd_dummy_capsrc_info   snd_ctl_boolean_stereo_info
 769
 770 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
 771                                 struct snd_ctl_elem_value *ucontrol)
 772 {
 773         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 774         int addr = kcontrol->private_value;
 775
 776         spin_lock_irq(&dummy->mixer_lock);
 777         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
 778         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
 779         spin_unlock_irq(&dummy->mixer_lock);
 780         return 0;
 781 }
 782
 783 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 784 {
 785         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 786         int change, addr = kcontrol->private_value;
 787         int left, right;
 788
 789         left = ucontrol->value.integer.value[0] & 1;
 790         right = ucontrol->value.integer.value[1] & 1;
 791         spin_lock_irq(&dummy->mixer_lock);
 792         change = dummy->capture_source[addr][0] != left &&
 793                  dummy->capture_source[addr][1] != right;
 794         dummy->capture_source[addr][0] = left;
 795         dummy->capture_source[addr][1] = right;
 796         spin_unlock_irq(&dummy->mixer_lock);
 797         return change;
 798 }
 799
 800 static int snd_dummy_iobox_info(struct snd_kcontrol *kcontrol,
 801                                 struct snd_ctl_elem_info *info)
 802 {
 803         static const char *const names[] = { "None", "CD Player" };
 804
 805         return snd_ctl_enum_info(info, 1, 2, names);
 806 }
 807
 808 static int snd_dummy_iobox_get(struct snd_kcontrol *kcontrol,
 809                                struct snd_ctl_elem_value *value)
 810 {
 811         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 812
 813         value->value.enumerated.item[0] = dummy->iobox;
 814         return 0;
 815 }
 816
 817 static int snd_dummy_iobox_put(struct snd_kcontrol *kcontrol,
 818                                struct snd_ctl_elem_value *value)
 819 {
 820         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 821         int changed;
 822
 823         if (value->value.enumerated.item[0] > 1)
 824                 return -EINVAL;
 825
 826         changed = value->value.enumerated.item[0] != dummy->iobox;
 827         if (changed) {
 828                 dummy->iobox = value->value.enumerated.item[0];
 829
 830                 if (dummy->iobox) {
 831                         dummy->cd_volume_ctl->vd[0].access &=
 832                                 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
 833                         dummy->cd_switch_ctl->vd[0].access &=
 834                                 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
 835                 } else {
 836                         dummy->cd_volume_ctl->vd[0].access |=
 837                                 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
 838                         dummy->cd_switch_ctl->vd[0].access |=
 839                                 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
 840                 }
 841
 842                 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
 843                                &dummy->cd_volume_ctl->id);
 844                 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
 845                                &dummy->cd_switch_ctl->id);
 846         }
 847
 848         return changed;
 849 }
 850
 851 static const struct snd_kcontrol_new snd_dummy_controls[] = {
 852 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
 853 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
 854 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
 855 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
 856 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
 857 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
 858 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
 859 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
 860 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
 861 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD),
 862 {
 863         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 864         .name  = "External I/O Box",
 865         .info  = snd_dummy_iobox_info,
 866         .get   = snd_dummy_iobox_get,
 867         .put   = snd_dummy_iobox_put,
 868 },
 869 };
 870
 871 static int snd_card_dummy_new_mixer(struct snd_dummy *dummy)
 872 {
 873         struct snd_card *card = dummy->card;
 874         struct snd_kcontrol *kcontrol;
 875         unsigned int idx;
 876         int err;
 877
 878         spin_lock_init(&dummy->mixer_lock);
 879         strcpy(card->mixername, "Dummy Mixer");
 880         dummy->iobox = 1;
 881
 882         for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
 883                 kcontrol = snd_ctl_new1(&snd_dummy_controls[idx], dummy);
 884                 err = snd_ctl_add(card, kcontrol);
 885                 if (err < 0)
 886                         return err;
 887                 if (!strcmp(kcontrol->id.name, "CD Volume"))
 888                         dummy->cd_volume_ctl = kcontrol;
 889                 else if (!strcmp(kcontrol->id.name, "CD Capture Switch"))
 890                         dummy->cd_switch_ctl = kcontrol;
 891
 892         }
 893         return 0;
 894 }
 895
 896 #if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_PROC_FS)
 897 /*
 898  * proc interface
 899  */
 900 static void print_formats(struct snd_dummy *dummy,
 901                           struct snd_info_buffer *buffer)
 902 {
 903         snd_pcm_format_t i;
 904
 905         pcm_for_each_format(i) {
 906                 if (dummy->pcm_hw.formats & pcm_format_to_bits(i))
 907                         snd_iprintf(buffer, " %s", snd_pcm_format_name(i));
 908         }
 909 }
 910
 911 static void print_rates(struct snd_dummy *dummy,
 912                         struct snd_info_buffer *buffer)
 913 {
 914         static const int rates[] = {
 915                 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000,
 916                 64000, 88200, 96000, 176400, 192000,
 917         };
 918         int i;
 919
 920         if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_CONTINUOUS)
 921                 snd_iprintf(buffer, " continuous");
 922         if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_KNOT)
 923                 snd_iprintf(buffer, " knot");
 924         for (i = 0; i < ARRAY_SIZE(rates); i++)
 925                 if (dummy->pcm_hw.rates & (1 << i))
 926                         snd_iprintf(buffer, " %d", rates[i]);
 927 }
 928
 929 #define get_dummy_int_ptr(dummy, ofs) \
 930         (unsigned int *)((char *)&((dummy)->pcm_hw) + (ofs))
 931 #define get_dummy_ll_ptr(dummy, ofs) \
 932         (unsigned long long *)((char *)&((dummy)->pcm_hw) + (ofs))
 933
 934 struct dummy_hw_field {
 935         const char *name;
 936         const char *format;
 937         unsigned int offset;
 938         unsigned int size;
 939 };
 940 #define FIELD_ENTRY(item, fmt) {                   \
 941         .name = #item,                             \
 942         .format = fmt,                             \
 943         .offset = offsetof(struct snd_pcm_hardware, item), \
 944         .size = sizeof(dummy_pcm_hardware.item) }
 945
 946 static const struct dummy_hw_field fields[] = {
 947         FIELD_ENTRY(formats, "%#llx"),
 948         FIELD_ENTRY(rates, "%#x"),
 949         FIELD_ENTRY(rate_min, "%d"),
 950         FIELD_ENTRY(rate_max, "%d"),
 951         FIELD_ENTRY(channels_min, "%d"),
 952         FIELD_ENTRY(channels_max, "%d"),
 953         FIELD_ENTRY(buffer_bytes_max, "%ld"),
 954         FIELD_ENTRY(period_bytes_min, "%ld"),
 955         FIELD_ENTRY(period_bytes_max, "%ld"),
 956         FIELD_ENTRY(periods_min, "%d"),
 957         FIELD_ENTRY(periods_max, "%d"),
 958 };
 959
 960 static void dummy_proc_read(struct snd_info_entry *entry,
 961                             struct snd_info_buffer *buffer)
 962 {
 963         struct snd_dummy *dummy = entry->private_data;
 964         int i;
 965
 966         for (i = 0; i < ARRAY_SIZE(fields); i++) {
 967                 snd_iprintf(buffer, "%s ", fields[i].name);
 968                 if (fields[i].size == sizeof(int))
 969                         snd_iprintf(buffer, fields[i].format,
 970                                 *get_dummy_int_ptr(dummy, fields[i].offset));
 971                 else
 972                         snd_iprintf(buffer, fields[i].format,
 973                                 *get_dummy_ll_ptr(dummy, fields[i].offset));
 974                 if (!strcmp(fields[i].name, "formats"))
 975                         print_formats(dummy, buffer);
 976                 else if (!strcmp(fields[i].name, "rates"))
 977                         print_rates(dummy, buffer);
 978                 snd_iprintf(buffer, "\n");
 979         }
 980 }
 981
 982 static void dummy_proc_write(struct snd_info_entry *entry,
 983                              struct snd_info_buffer *buffer)
 984 {
 985         struct snd_dummy *dummy = entry->private_data;
 986         char line[64];
 987
 988         while (!snd_info_get_line(buffer, line, sizeof(line))) {
 989                 char item[20];
 990                 const char *ptr;
 991                 unsigned long long val;
 992                 int i;
 993
 994                 ptr = snd_info_get_str(item, line, sizeof(item));
 995                 for (i = 0; i < ARRAY_SIZE(fields); i++) {
 996                         if (!strcmp(item, fields[i].name))
 997                                 break;
 998                 }
 999                 if (i >= ARRAY_SIZE(fields))
1000                         continue;
1001                 snd_info_get_str(item, ptr, sizeof(item));
1002                 if (kstrtoull(item, 0, &val))
1003                         continue;
1004                 if (fields[i].size == sizeof(int))
1005                         *get_dummy_int_ptr(dummy, fields[i].offset) = val;
1006                 else
1007                         *get_dummy_ll_ptr(dummy, fields[i].offset) = val;
1008         }
1009 }
1010
1011 static void dummy_proc_init(struct snd_dummy *chip)
1012 {
1013         snd_card_rw_proc_new(chip->card, "dummy_pcm", chip,
1014                              dummy_proc_read, dummy_proc_write);
1015 }
1016 #else
1017 #define dummy_proc_init(x)
1018 #endif /* CONFIG_SND_DEBUG && CONFIG_SND_PROC_FS */
1019
1020 static int snd_dummy_probe(struct platform_device *devptr)
1021 {
1022         struct snd_card *card;
1023         struct snd_dummy *dummy;
1024         const struct dummy_model *m = NULL, **mdl;
1025         int idx, err;
1026         int dev = devptr->id;
1027
1028         err = snd_devm_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE,
1029                                 sizeof(struct snd_dummy), &card);
1030         if (err < 0)
1031                 return err;
1032         dummy = card->private_data;
1033         dummy->card = card;
1034         for (mdl = dummy_models; *mdl && model[dev]; mdl++) {
1035                 if (strcmp(model[dev], (*mdl)->name) == 0) {
1036                         printk(KERN_INFO
1037                                 "snd-dummy: Using model '%s' for card %i\n",
1038                                 (*mdl)->name, card->number);
1039                         m = dummy->model = *mdl;
1040                         break;
1041                 }
1042         }
1043         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
1044                 if (pcm_substreams[dev] < 1)
1045                         pcm_substreams[dev] = 1;
1046                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
1047                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
1048                 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
1049                 if (err < 0)
1050                         return err;
1051         }
1052
1053         dummy->pcm_hw = dummy_pcm_hardware;
1054         if (m) {
1055                 if (m->formats)
1056                         dummy->pcm_hw.formats = m->formats;
1057                 if (m->buffer_bytes_max)
1058                         dummy->pcm_hw.buffer_bytes_max = m->buffer_bytes_max;
1059                 if (m->period_bytes_min)
1060                         dummy->pcm_hw.period_bytes_min = m->period_bytes_min;
1061                 if (m->period_bytes_max)
1062                         dummy->pcm_hw.period_bytes_max = m->period_bytes_max;
1063                 if (m->periods_min)
1064                         dummy->pcm_hw.periods_min = m->periods_min;
1065                 if (m->periods_max)
1066                         dummy->pcm_hw.periods_max = m->periods_max;
1067                 if (m->rates)
1068                         dummy->pcm_hw.rates = m->rates;
1069                 if (m->rate_min)
1070                         dummy->pcm_hw.rate_min = m->rate_min;
1071                 if (m->rate_max)
1072                         dummy->pcm_hw.rate_max = m->rate_max;
1073                 if (m->channels_min)
1074                         dummy->pcm_hw.channels_min = m->channels_min;
1075                 if (m->channels_max)
1076                         dummy->pcm_hw.channels_max = m->channels_max;
1077         }
1078
1079         err = snd_card_dummy_new_mixer(dummy);
1080         if (err < 0)
1081                 return err;
1082         strcpy(card->driver, "Dummy");
1083         strcpy(card->shortname, "Dummy");
1084         sprintf(card->longname, "Dummy %i", dev + 1);
1085
1086         dummy_proc_init(dummy);
1087
1088         err = snd_card_register(card);
1089         if (err < 0)
1090                 return err;
1091         platform_set_drvdata(devptr, card);
1092         return 0;
1093 }
1094
1095 #ifdef CONFIG_PM_SLEEP
1096 static int snd_dummy_suspend(struct device *pdev)
1097 {
1098         struct snd_card *card = dev_get_drvdata(pdev);
1099
1100         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1101         return 0;
1102 }
1103
1104 static int snd_dummy_resume(struct device *pdev)
1105 {
1106         struct snd_card *card = dev_get_drvdata(pdev);
1107
1108         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1109         return 0;
1110 }
1111
1112 static SIMPLE_DEV_PM_OPS(snd_dummy_pm, snd_dummy_suspend, snd_dummy_resume);
1113 #define SND_DUMMY_PM_OPS        &snd_dummy_pm
1114 #else
1115 #define SND_DUMMY_PM_OPS        NULL
1116 #endif
1117
1118 #define SND_DUMMY_DRIVER        "snd_dummy"
1119
1120 static struct platform_driver snd_dummy_driver = {
1121         .probe          = snd_dummy_probe,
1122         .driver         = {
1123                 .name   = SND_DUMMY_DRIVER,
1124                 .pm     = SND_DUMMY_PM_OPS,
1125         },
1126 };
1127
1128 static void snd_dummy_unregister_all(void)
1129 {
1130         int i;
1131
1132         for (i = 0; i < ARRAY_SIZE(devices); ++i)
1133                 platform_device_unregister(devices[i]);
1134         platform_driver_unregister(&snd_dummy_driver);
1135         free_fake_buffer();
1136 }
1137
1138 static int __init alsa_card_dummy_init(void)
1139 {
1140         int i, cards, err;
1141
1142         err = platform_driver_register(&snd_dummy_driver);
1143         if (err < 0)
1144                 return err;
1145
1146         err = alloc_fake_buffer();
1147         if (err < 0) {
1148                 platform_driver_unregister(&snd_dummy_driver);
1149                 return err;
1150         }
1151
1152         cards = 0;
1153         for (i = 0; i < SNDRV_CARDS; i++) {
1154                 struct platform_device *device;
1155                 if (! enable[i])
1156                         continue;
1157                 device = platform_device_register_simple(SND_DUMMY_DRIVER,
1158                                                          i, NULL, 0);
1159                 if (IS_ERR(device))
1160                         continue;
1161                 if (!platform_get_drvdata(device)) {
1162                         platform_device_unregister(device);
1163                         continue;
1164                 }
1165                 devices[i] = device;
1166                 cards++;
1167         }
1168         if (!cards) {
1169 #ifdef MODULE
1170                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
1171 #endif
1172                 snd_dummy_unregister_all();
1173                 return -ENODEV;
1174         }
1175         return 0;
1176 }
1177
1178 static void __exit alsa_card_dummy_exit(void)
1179 {
1180         snd_dummy_unregister_all();
1181 }
1182
1183 module_init(alsa_card_dummy_init)
1184 module_exit(alsa_card_dummy_exit)