kernel/sound/drivers/dummy.c

   1 /*
   2  *  Dummy soundcard
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *   This program is free software; you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation; either version 2 of the License, or
   8  *   (at your option) any later version.
   9  *
  10  *   This program is distributed in the hope that it will be useful,
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *   GNU General Public License for more details.
  14  *
  15  *   You should have received a copy of the GNU General Public License
  16  *   along with this program; if not, write to the Free Software
  17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  18  *
  19  */
  20
  21 #include <linux/init.h>
  22 #include <linux/err.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/jiffies.h>
  25 #include <linux/slab.h>
  26 #include <linux/time.h>
  27 #include <linux/wait.h>
  28 #include <linux/hrtimer.h>
  29 #include <linux/math64.h>
  30 #include <linux/module.h>
  31 #include <sound/core.h>
  32 #include <sound/control.h>
  33 #include <sound/tlv.h>
  34 #include <sound/pcm.h>
  35 #include <sound/rawmidi.h>
  36 #include <sound/info.h>
  37 #include <sound/initval.h>
  38
  39 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  40 MODULE_DESCRIPTION("Dummy soundcard (/dev/null)");
  41 MODULE_LICENSE("GPL");
  42 MODULE_SUPPORTED_DEVICE("{{ALSA,Dummy soundcard}}");
  43
  44 #define MAX_PCM_DEVICES         4
  45 #define MAX_PCM_SUBSTREAMS      128
  46 #define MAX_MIDI_DEVICES        2
  47
  48 /* defaults */
  49 #define MAX_BUFFER_SIZE         (64*1024)
  50 #define MIN_PERIOD_SIZE         64
  51 #define MAX_PERIOD_SIZE         MAX_BUFFER_SIZE
  52 #define USE_FORMATS             (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)
  53 #define USE_RATE                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000
  54 #define USE_RATE_MIN            5500
  55 #define USE_RATE_MAX            48000
  56 #define USE_CHANNELS_MIN        1
  57 #define USE_CHANNELS_MAX        2
  58 #define USE_PERIODS_MIN         1
  59 #define USE_PERIODS_MAX         1024
  60
  61 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
  62 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
  63 static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
  64 static char *model[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = NULL};
  65 static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
  66 static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
  67 //static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
  68 #ifdef CONFIG_HIGH_RES_TIMERS
  69 static bool hrtimer = 1;
  70 #endif
  71 static bool fake_buffer = 1;
  72
  73 module_param_array(index, int, NULL, 0444);
  74 MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
  75 module_param_array(id, charp, NULL, 0444);
  76 MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
  77 module_param_array(enable, bool, NULL, 0444);
  78 MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
  79 module_param_array(model, charp, NULL, 0444);
  80 MODULE_PARM_DESC(model, "Soundcard model.");
  81 module_param_array(pcm_devs, int, NULL, 0444);
  82 MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
  83 module_param_array(pcm_substreams, int, NULL, 0444);
  84 MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-128) for dummy driver.");
  85 //module_param_array(midi_devs, int, NULL, 0444);
  86 //MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
  87 module_param(fake_buffer, bool, 0444);
  88 MODULE_PARM_DESC(fake_buffer, "Fake buffer allocations.");
  89 #ifdef CONFIG_HIGH_RES_TIMERS
  90 module_param(hrtimer, bool, 0644);
  91 MODULE_PARM_DESC(hrtimer, "Use hrtimer as the timer source.");
  92 #endif
  93
  94 static struct platform_device *devices[SNDRV_CARDS];
  95
  96 #define MIXER_ADDR_MASTER       0
  97 #define MIXER_ADDR_LINE         1
  98 #define MIXER_ADDR_MIC          2
  99 #define MIXER_ADDR_SYNTH        3
 100 #define MIXER_ADDR_CD           4
 101 #define MIXER_ADDR_LAST         4
 102
 103 struct dummy_timer_ops {
 104         int (*create)(struct snd_pcm_substream *);
 105         void (*free)(struct snd_pcm_substream *);
 106         int (*prepare)(struct snd_pcm_substream *);
 107         int (*start)(struct snd_pcm_substream *);
 108         int (*stop)(struct snd_pcm_substream *);
 109         snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *);
 110 };
 111
 112 struct dummy_model {
 113         const char *name;
 114         int (*playback_constraints)(struct snd_pcm_runtime *runtime);
 115         int (*capture_constraints)(struct snd_pcm_runtime *runtime);
 116         u64 formats;
 117         size_t buffer_bytes_max;
 118         size_t period_bytes_min;
 119         size_t period_bytes_max;
 120         unsigned int periods_min;
 121         unsigned int periods_max;
 122         unsigned int rates;
 123         unsigned int rate_min;
 124         unsigned int rate_max;
 125         unsigned int channels_min;
 126         unsigned int channels_max;
 127 };
 128
 129 struct snd_dummy {
 130         struct snd_card *card;
 131         struct dummy_model *model;
 132         struct snd_pcm *pcm;
 133         struct snd_pcm_hardware pcm_hw;
 134         spinlock_t mixer_lock;
 135         int mixer_volume[MIXER_ADDR_LAST+1][2];
 136         int capture_source[MIXER_ADDR_LAST+1][2];
 137         int iobox;
 138         struct snd_kcontrol *cd_volume_ctl;
 139         struct snd_kcontrol *cd_switch_ctl;
 140         const struct dummy_timer_ops *timer_ops;
 141 };
 142
 143 /*
 144  * card models
 145  */
 146
 147 static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime)
 148 {
 149         int err;
 150         err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 151         if (err < 0)
 152                 return err;
 153         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX);
 154         if (err < 0)
 155                 return err;
 156         return 0;
 157 }
 158
 159 struct dummy_model model_emu10k1 = {
 160         .name = "emu10k1",
 161         .playback_constraints = emu10k1_playback_constraints,
 162         .buffer_bytes_max = 128 * 1024,
 163 };
 164
 165 struct dummy_model model_rme9652 = {
 166         .name = "rme9652",
 167         .buffer_bytes_max = 26 * 64 * 1024,
 168         .formats = SNDRV_PCM_FMTBIT_S32_LE,
 169         .channels_min = 26,
 170         .channels_max = 26,
 171         .periods_min = 2,
 172         .periods_max = 2,
 173 };
 174
 175 struct dummy_model model_ice1712 = {
 176         .name = "ice1712",
 177         .buffer_bytes_max = 256 * 1024,
 178         .formats = SNDRV_PCM_FMTBIT_S32_LE,
 179         .channels_min = 10,
 180         .channels_max = 10,
 181         .periods_min = 1,
 182         .periods_max = 1024,
 183 };
 184
 185 struct dummy_model model_uda1341 = {
 186         .name = "uda1341",
 187         .buffer_bytes_max = 16380,
 188         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 189         .channels_min = 2,
 190         .channels_max = 2,
 191         .periods_min = 2,
 192         .periods_max = 255,
 193 };
 194
 195 struct dummy_model model_ac97 = {
 196         .name = "ac97",
 197         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 198         .channels_min = 2,
 199         .channels_max = 2,
 200         .rates = SNDRV_PCM_RATE_48000,
 201         .rate_min = 48000,
 202         .rate_max = 48000,
 203 };
 204
 205 struct dummy_model model_ca0106 = {
 206         .name = "ca0106",
 207         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 208         .buffer_bytes_max = ((65536-64)*8),
 209         .period_bytes_max = (65536-64),
 210         .periods_min = 2,
 211         .periods_max = 8,
 212         .channels_min = 2,
 213         .channels_max = 2,
 214         .rates = SNDRV_PCM_RATE_48000|SNDRV_PCM_RATE_96000|SNDRV_PCM_RATE_192000,
 215         .rate_min = 48000,
 216         .rate_max = 192000,
 217 };
 218
 219 struct dummy_model *dummy_models[] = {
 220         &model_emu10k1,
 221         &model_rme9652,
 222         &model_ice1712,
 223         &model_uda1341,
 224         &model_ac97,
 225         &model_ca0106,
 226         NULL
 227 };
 228
 229 /*
 230  * system timer interface
 231  */
 232
 233 struct dummy_systimer_pcm {
 234         spinlock_t lock;
 235         struct timer_list timer;
 236         unsigned long base_time;
 237         unsigned int frac_pos;  /* fractional sample position (based HZ) */
 238         unsigned int frac_period_rest;
 239         unsigned int frac_buffer_size;  /* buffer_size * HZ */
 240         unsigned int frac_period_size;  /* period_size * HZ */
 241         unsigned int rate;
 242         int elapsed;
 243         struct snd_pcm_substream *substream;
 244 };
 245
 246 static void dummy_systimer_rearm(struct dummy_systimer_pcm *dpcm)
 247 {
 248         mod_timer(&dpcm->timer, jiffies +
 249                 (dpcm->frac_period_rest + dpcm->rate - 1) / dpcm->rate);
 250 }
 251
 252 static void dummy_systimer_update(struct dummy_systimer_pcm *dpcm)
 253 {
 254         unsigned long delta;
 255
 256         delta = jiffies - dpcm->base_time;
 257         if (!delta)
 258                 return;
 259         dpcm->base_time += delta;
 260         delta *= dpcm->rate;
 261         dpcm->frac_pos += delta;
 262         while (dpcm->frac_pos >= dpcm->frac_buffer_size)
 263                 dpcm->frac_pos -= dpcm->frac_buffer_size;
 264         while (dpcm->frac_period_rest <= delta) {
 265                 dpcm->elapsed++;
 266                 dpcm->frac_period_rest += dpcm->frac_period_size;
 267         }
 268         dpcm->frac_period_rest -= delta;
 269 }
 270
 271 static int dummy_systimer_start(struct snd_pcm_substream *substream)
 272 {
 273         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
 274         spin_lock(&dpcm->lock);
 275         dpcm->base_time = jiffies;
 276         dummy_systimer_rearm(dpcm);
 277         spin_unlock(&dpcm->lock);
 278         return 0;
 279 }
 280
 281 static int dummy_systimer_stop(struct snd_pcm_substream *substream)
 282 {
 283         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
 284         spin_lock(&dpcm->lock);
 285         del_timer(&dpcm->timer);
 286         spin_unlock(&dpcm->lock);
 287         return 0;
 288 }
 289
 290 static int dummy_systimer_prepare(struct snd_pcm_substream *substream)
 291 {
 292         struct snd_pcm_runtime *runtime = substream->runtime;
 293         struct dummy_systimer_pcm *dpcm = runtime->private_data;
 294
 295         dpcm->frac_pos = 0;
 296         dpcm->rate = runtime->rate;
 297         dpcm->frac_buffer_size = runtime->buffer_size * HZ;
 298         dpcm->frac_period_size = runtime->period_size * HZ;
 299         dpcm->frac_period_rest = dpcm->frac_period_size;
 300         dpcm->elapsed = 0;
 301
 302         return 0;
 303 }
 304
 305 static void dummy_systimer_callback(unsigned long data)
 306 {
 307         struct dummy_systimer_pcm *dpcm = (struct dummy_systimer_pcm *)data;
 308         unsigned long flags;
 309         int elapsed = 0;
 310
 311         spin_lock_irqsave(&dpcm->lock, flags);
 312         dummy_systimer_update(dpcm);
 313         dummy_systimer_rearm(dpcm);
 314         elapsed = dpcm->elapsed;
 315         dpcm->elapsed = 0;
 316         spin_unlock_irqrestore(&dpcm->lock, flags);
 317         if (elapsed)
 318                 snd_pcm_period_elapsed(dpcm->substream);
 319 }
 320
 321 static snd_pcm_uframes_t
 322 dummy_systimer_pointer(struct snd_pcm_substream *substream)
 323 {
 324         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
 325         snd_pcm_uframes_t pos;
 326
 327         spin_lock(&dpcm->lock);
 328         dummy_systimer_update(dpcm);
 329         pos = dpcm->frac_pos / HZ;
 330         spin_unlock(&dpcm->lock);
 331         return pos;
 332 }
 333
 334 static int dummy_systimer_create(struct snd_pcm_substream *substream)
 335 {
 336         struct dummy_systimer_pcm *dpcm;
 337
 338         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
 339         if (!dpcm)
 340                 return -ENOMEM;
 341         substream->runtime->private_data = dpcm;
 342         setup_timer(&dpcm->timer, dummy_systimer_callback,
 343                         (unsigned long) dpcm);
 344         spin_lock_init(&dpcm->lock);
 345         dpcm->substream = substream;
 346         return 0;
 347 }
 348
 349 static void dummy_systimer_free(struct snd_pcm_substream *substream)
 350 {
 351         kfree(substream->runtime->private_data);
 352 }
 353
 354 static struct dummy_timer_ops dummy_systimer_ops = {
 355         .create =       dummy_systimer_create,
 356         .free =         dummy_systimer_free,
 357         .prepare =      dummy_systimer_prepare,
 358         .start =        dummy_systimer_start,
 359         .stop =         dummy_systimer_stop,
 360         .pointer =      dummy_systimer_pointer,
 361 };
 362
 363 #ifdef CONFIG_HIGH_RES_TIMERS
 364 /*
 365  * hrtimer interface
 366  */
 367
 368 struct dummy_hrtimer_pcm {
 369         ktime_t base_time;
 370         ktime_t period_time;
 371         atomic_t running;
 372         struct hrtimer timer;
 373         struct tasklet_struct tasklet;
 374         struct snd_pcm_substream *substream;
 375 };
 376
 377 static void dummy_hrtimer_pcm_elapsed(unsigned long priv)
 378 {
 379         struct dummy_hrtimer_pcm *dpcm = (struct dummy_hrtimer_pcm *)priv;
 380         if (atomic_read(&dpcm->running))
 381                 snd_pcm_period_elapsed(dpcm->substream);
 382 }
 383
 384 static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer)
 385 {
 386         struct dummy_hrtimer_pcm *dpcm;
 387
 388         dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer);
 389         if (!atomic_read(&dpcm->running))
 390                 return HRTIMER_NORESTART;
 391         tasklet_schedule(&dpcm->tasklet);
 392         hrtimer_forward_now(timer, dpcm->period_time);
 393         return HRTIMER_RESTART;
 394 }
 395
 396 static int dummy_hrtimer_start(struct snd_pcm_substream *substream)
 397 {
 398         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
 399
 400         dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer);
 401         hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL);
 402         atomic_set(&dpcm->running, 1);
 403         return 0;
 404 }
 405
 406 static int dummy_hrtimer_stop(struct snd_pcm_substream *substream)
 407 {
 408         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
 409
 410         atomic_set(&dpcm->running, 0);
 411         hrtimer_cancel(&dpcm->timer);
 412         return 0;
 413 }
 414
 415 static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
 416 {
 417         tasklet_kill(&dpcm->tasklet);
 418 }
 419
 420 static snd_pcm_uframes_t
 421 dummy_hrtimer_pointer(struct snd_pcm_substream *substream)
 422 {
 423         struct snd_pcm_runtime *runtime = substream->runtime;
 424         struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
 425         u64 delta;
 426         u32 pos;
 427
 428         delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer),
 429                                dpcm->base_time);
 430         delta = div_u64(delta * runtime->rate + 999999, 1000000);
 431         div_u64_rem(delta, runtime->buffer_size, &pos);
 432         return pos;
 433 }
 434
 435 static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream)
 436 {
 437         struct snd_pcm_runtime *runtime = substream->runtime;
 438         struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
 439         unsigned int period, rate;
 440         long sec;
 441         unsigned long nsecs;
 442
 443         dummy_hrtimer_sync(dpcm);
 444         period = runtime->period_size;
 445         rate = runtime->rate;
 446         sec = period / rate;
 447         period %= rate;
 448         nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate);
 449         dpcm->period_time = ktime_set(sec, nsecs);
 450
 451         return 0;
 452 }
 453
 454 static int dummy_hrtimer_create(struct snd_pcm_substream *substream)
 455 {
 456         struct dummy_hrtimer_pcm *dpcm;
 457
 458         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
 459         if (!dpcm)
 460                 return -ENOMEM;
 461         substream->runtime->private_data = dpcm;
 462         hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 463         dpcm->timer.function = dummy_hrtimer_callback;
 464         dpcm->substream = substream;
 465         atomic_set(&dpcm->running, 0);
 466         tasklet_init(&dpcm->tasklet, dummy_hrtimer_pcm_elapsed,
 467                      (unsigned long)dpcm);
 468         return 0;
 469 }
 470
 471 static void dummy_hrtimer_free(struct snd_pcm_substream *substream)
 472 {
 473         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
 474         dummy_hrtimer_sync(dpcm);
 475         kfree(dpcm);
 476 }
 477
 478 static struct dummy_timer_ops dummy_hrtimer_ops = {
 479         .create =       dummy_hrtimer_create,
 480         .free =         dummy_hrtimer_free,
 481         .prepare =      dummy_hrtimer_prepare,
 482         .start =        dummy_hrtimer_start,
 483         .stop =         dummy_hrtimer_stop,
 484         .pointer =      dummy_hrtimer_pointer,
 485 };
 486
 487 #endif /* CONFIG_HIGH_RES_TIMERS */
 488
 489 /*
 490  * PCM interface
 491  */
 492
 493 static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 494 {
 495         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
 496
 497         switch (cmd) {
 498         case SNDRV_PCM_TRIGGER_START:
 499         case SNDRV_PCM_TRIGGER_RESUME:
 500                 return dummy->timer_ops->start(substream);
 501         case SNDRV_PCM_TRIGGER_STOP:
 502         case SNDRV_PCM_TRIGGER_SUSPEND:
 503                 return dummy->timer_ops->stop(substream);
 504         }
 505         return -EINVAL;
 506 }
 507
 508 static int dummy_pcm_prepare(struct snd_pcm_substream *substream)
 509 {
 510         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
 511
 512         return dummy->timer_ops->prepare(substream);
 513 }
 514
 515 static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream)
 516 {
 517         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
 518
 519         return dummy->timer_ops->pointer(substream);
 520 }
 521
 522 static struct snd_pcm_hardware dummy_pcm_hardware = {
 523         .info =                 (SNDRV_PCM_INFO_MMAP |
 524                                  SNDRV_PCM_INFO_INTERLEAVED |
 525                                  SNDRV_PCM_INFO_RESUME |
 526                                  SNDRV_PCM_INFO_MMAP_VALID),
 527         .formats =              USE_FORMATS,
 528         .rates =                USE_RATE,
 529         .rate_min =             USE_RATE_MIN,
 530         .rate_max =             USE_RATE_MAX,
 531         .channels_min =         USE_CHANNELS_MIN,
 532         .channels_max =         USE_CHANNELS_MAX,
 533         .buffer_bytes_max =     MAX_BUFFER_SIZE,
 534         .period_bytes_min =     MIN_PERIOD_SIZE,
 535         .period_bytes_max =     MAX_PERIOD_SIZE,
 536         .periods_min =          USE_PERIODS_MIN,
 537         .periods_max =          USE_PERIODS_MAX,
 538         .fifo_size =            0,
 539 };
 540
 541 static int dummy_pcm_hw_params(struct snd_pcm_substream *substream,
 542                                struct snd_pcm_hw_params *hw_params)
 543 {
 544         if (fake_buffer) {
 545                 /* runtime->dma_bytes has to be set manually to allow mmap */
 546                 substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
 547                 return 0;
 548         }
 549         return snd_pcm_lib_malloc_pages(substream,
 550                                         params_buffer_bytes(hw_params));
 551 }
 552
 553 static int dummy_pcm_hw_free(struct snd_pcm_substream *substream)
 554 {
 555         if (fake_buffer)
 556                 return 0;
 557         return snd_pcm_lib_free_pages(substream);
 558 }
 559
 560 static int dummy_pcm_open(struct snd_pcm_substream *substream)
 561 {
 562         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
 563         struct dummy_model *model = dummy->model;
 564         struct snd_pcm_runtime *runtime = substream->runtime;
 565         int err;
 566
 567         dummy->timer_ops = &dummy_systimer_ops;
 568 #ifdef CONFIG_HIGH_RES_TIMERS
 569         if (hrtimer)
 570                 dummy->timer_ops = &dummy_hrtimer_ops;
 571 #endif
 572
 573         err = dummy->timer_ops->create(substream);
 574         if (err < 0)
 575                 return err;
 576
 577         runtime->hw = dummy->pcm_hw;
 578         if (substream->pcm->device & 1) {
 579                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 580                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 581         }
 582         if (substream->pcm->device & 2)
 583                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
 584                                       SNDRV_PCM_INFO_MMAP_VALID);
 585
 586         if (model == NULL)
 587                 return 0;
 588
 589         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 590                 if (model->playback_constraints)
 591                         err = model->playback_constraints(substream->runtime);
 592         } else {
 593                 if (model->capture_constraints)
 594                         err = model->capture_constraints(substream->runtime);
 595         }
 596         if (err < 0) {
 597                 dummy->timer_ops->free(substream);
 598                 return err;
 599         }
 600         return 0;
 601 }
 602
 603 static int dummy_pcm_close(struct snd_pcm_substream *substream)
 604 {
 605         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
 606         dummy->timer_ops->free(substream);
 607         return 0;
 608 }
 609
 610 /*
 611  * dummy buffer handling
 612  */
 613
 614 static void *dummy_page[2];
 615
 616 static void free_fake_buffer(void)
 617 {
 618         if (fake_buffer) {
 619                 int i;
 620                 for (i = 0; i < 2; i++)
 621                         if (dummy_page[i]) {
 622                                 free_page((unsigned long)dummy_page[i]);
 623                                 dummy_page[i] = NULL;
 624                         }
 625         }
 626 }
 627
 628 static int alloc_fake_buffer(void)
 629 {
 630         int i;
 631
 632         if (!fake_buffer)
 633                 return 0;
 634         for (i = 0; i < 2; i++) {
 635                 dummy_page[i] = (void *)get_zeroed_page(GFP_KERNEL);
 636                 if (!dummy_page[i]) {
 637                         free_fake_buffer();
 638                         return -ENOMEM;
 639                 }
 640         }
 641         return 0;
 642 }
 643
 644 static int dummy_pcm_copy(struct snd_pcm_substream *substream,
 645                           int channel, snd_pcm_uframes_t pos,
 646                           void __user *dst, snd_pcm_uframes_t count)
 647 {
 648         return 0; /* do nothing */
 649 }
 650
 651 static int dummy_pcm_silence(struct snd_pcm_substream *substream,
 652                              int channel, snd_pcm_uframes_t pos,
 653                              snd_pcm_uframes_t count)
 654 {
 655         return 0; /* do nothing */
 656 }
 657
 658 static struct page *dummy_pcm_page(struct snd_pcm_substream *substream,
 659                                    unsigned long offset)
 660 {
 661         return virt_to_page(dummy_page[substream->stream]); /* the same page */
 662 }
 663
 664 static struct snd_pcm_ops dummy_pcm_ops = {
 665         .open =         dummy_pcm_open,
 666         .close =        dummy_pcm_close,
 667         .ioctl =        snd_pcm_lib_ioctl,
 668         .hw_params =    dummy_pcm_hw_params,
 669         .hw_free =      dummy_pcm_hw_free,
 670         .prepare =      dummy_pcm_prepare,
 671         .trigger =      dummy_pcm_trigger,
 672         .pointer =      dummy_pcm_pointer,
 673 };
 674
 675 static struct snd_pcm_ops dummy_pcm_ops_no_buf = {
 676         .open =         dummy_pcm_open,
 677         .close =        dummy_pcm_close,
 678         .ioctl =        snd_pcm_lib_ioctl,
 679         .hw_params =    dummy_pcm_hw_params,
 680         .hw_free =      dummy_pcm_hw_free,
 681         .prepare =      dummy_pcm_prepare,
 682         .trigger =      dummy_pcm_trigger,
 683         .pointer =      dummy_pcm_pointer,
 684         .copy =         dummy_pcm_copy,
 685         .silence =      dummy_pcm_silence,
 686         .page =         dummy_pcm_page,
 687 };
 688
 689 static int snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
 690                               int substreams)
 691 {
 692         struct snd_pcm *pcm;
 693         struct snd_pcm_ops *ops;
 694         int err;
 695
 696         err = snd_pcm_new(dummy->card, "Dummy PCM", device,
 697                                substreams, substreams, &pcm);
 698         if (err < 0)
 699                 return err;
 700         dummy->pcm = pcm;
 701         if (fake_buffer)
 702                 ops = &dummy_pcm_ops_no_buf;
 703         else
 704                 ops = &dummy_pcm_ops;
 705         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, ops);
 706         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, ops);
 707         pcm->private_data = dummy;
 708         pcm->info_flags = 0;
 709         strcpy(pcm->name, "Dummy PCM");
 710         if (!fake_buffer) {
 711                 snd_pcm_lib_preallocate_pages_for_all(pcm,
 712                         SNDRV_DMA_TYPE_CONTINUOUS,
 713                         snd_dma_continuous_data(GFP_KERNEL),
 714                         0, 64*1024);
 715         }
 716         return 0;
 717 }
 718
 719 /*
 720  * mixer interface
 721  */
 722
 723 #define DUMMY_VOLUME(xname, xindex, addr) \
 724 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
 725   .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
 726   .name = xname, .index = xindex, \
 727   .info = snd_dummy_volume_info, \
 728   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
 729   .private_value = addr, \
 730   .tlv = { .p = db_scale_dummy } }
 731
 732 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
 733                                  struct snd_ctl_elem_info *uinfo)
 734 {
 735         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 736         uinfo->count = 2;
 737         uinfo->value.integer.min = -50;
 738         uinfo->value.integer.max = 100;
 739         return 0;
 740 }
 741
 742 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
 743                                 struct snd_ctl_elem_value *ucontrol)
 744 {
 745         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 746         int addr = kcontrol->private_value;
 747
 748         spin_lock_irq(&dummy->mixer_lock);
 749         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
 750         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
 751         spin_unlock_irq(&dummy->mixer_lock);
 752         return 0;
 753 }
 754
 755 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
 756                                 struct snd_ctl_elem_value *ucontrol)
 757 {
 758         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 759         int change, addr = kcontrol->private_value;
 760         int left, right;
 761
 762         left = ucontrol->value.integer.value[0];
 763         if (left < -50)
 764                 left = -50;
 765         if (left > 100)
 766                 left = 100;
 767         right = ucontrol->value.integer.value[1];
 768         if (right < -50)
 769                 right = -50;
 770         if (right > 100)
 771                 right = 100;
 772         spin_lock_irq(&dummy->mixer_lock);
 773         change = dummy->mixer_volume[addr][0] != left ||
 774                  dummy->mixer_volume[addr][1] != right;
 775         dummy->mixer_volume[addr][0] = left;
 776         dummy->mixer_volume[addr][1] = right;
 777         spin_unlock_irq(&dummy->mixer_lock);
 778         return change;
 779 }
 780
 781 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
 782
 783 #define DUMMY_CAPSRC(xname, xindex, addr) \
 784 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 785   .info = snd_dummy_capsrc_info, \
 786   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
 787   .private_value = addr }
 788
 789 #define snd_dummy_capsrc_info   snd_ctl_boolean_stereo_info
 790
 791 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
 792                                 struct snd_ctl_elem_value *ucontrol)
 793 {
 794         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 795         int addr = kcontrol->private_value;
 796
 797         spin_lock_irq(&dummy->mixer_lock);
 798         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
 799         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
 800         spin_unlock_irq(&dummy->mixer_lock);
 801         return 0;
 802 }
 803
 804 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 805 {
 806         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 807         int change, addr = kcontrol->private_value;
 808         int left, right;
 809
 810         left = ucontrol->value.integer.value[0] & 1;
 811         right = ucontrol->value.integer.value[1] & 1;
 812         spin_lock_irq(&dummy->mixer_lock);
 813         change = dummy->capture_source[addr][0] != left &&
 814                  dummy->capture_source[addr][1] != right;
 815         dummy->capture_source[addr][0] = left;
 816         dummy->capture_source[addr][1] = right;
 817         spin_unlock_irq(&dummy->mixer_lock);
 818         return change;
 819 }
 820
 821 static int snd_dummy_iobox_info(struct snd_kcontrol *kcontrol,
 822                                 struct snd_ctl_elem_info *info)
 823 {
 824         const char *const names[] = { "None", "CD Player" };
 825
 826         return snd_ctl_enum_info(info, 1, 2, names);
 827 }
 828
 829 static int snd_dummy_iobox_get(struct snd_kcontrol *kcontrol,
 830                                struct snd_ctl_elem_value *value)
 831 {
 832         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 833
 834         value->value.enumerated.item[0] = dummy->iobox;
 835         return 0;
 836 }
 837
 838 static int snd_dummy_iobox_put(struct snd_kcontrol *kcontrol,
 839                                struct snd_ctl_elem_value *value)
 840 {
 841         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 842         int changed;
 843
 844         if (value->value.enumerated.item[0] > 1)
 845                 return -EINVAL;
 846
 847         changed = value->value.enumerated.item[0] != dummy->iobox;
 848         if (changed) {
 849                 dummy->iobox = value->value.enumerated.item[0];
 850
 851                 if (dummy->iobox) {
 852                         dummy->cd_volume_ctl->vd[0].access &=
 853                                 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
 854                         dummy->cd_switch_ctl->vd[0].access &=
 855                                 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
 856                 } else {
 857                         dummy->cd_volume_ctl->vd[0].access |=
 858                                 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
 859                         dummy->cd_switch_ctl->vd[0].access |=
 860                                 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
 861                 }
 862
 863                 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
 864                                &dummy->cd_volume_ctl->id);
 865                 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
 866                                &dummy->cd_switch_ctl->id);
 867         }
 868
 869         return changed;
 870 }
 871
 872 static struct snd_kcontrol_new snd_dummy_controls[] = {
 873 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
 874 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
 875 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
 876 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
 877 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
 878 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
 879 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
 880 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
 881 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
 882 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD),
 883 {
 884         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 885         .name  = "External I/O Box",
 886         .info  = snd_dummy_iobox_info,
 887         .get   = snd_dummy_iobox_get,
 888         .put   = snd_dummy_iobox_put,
 889 },
 890 };
 891
 892 static int snd_card_dummy_new_mixer(struct snd_dummy *dummy)
 893 {
 894         struct snd_card *card = dummy->card;
 895         struct snd_kcontrol *kcontrol;
 896         unsigned int idx;
 897         int err;
 898
 899         spin_lock_init(&dummy->mixer_lock);
 900         strcpy(card->mixername, "Dummy Mixer");
 901         dummy->iobox = 1;
 902
 903         for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
 904                 kcontrol = snd_ctl_new1(&snd_dummy_controls[idx], dummy);
 905                 err = snd_ctl_add(card, kcontrol);
 906                 if (err < 0)
 907                         return err;
 908                 if (!strcmp(kcontrol->id.name, "CD Volume"))
 909                         dummy->cd_volume_ctl = kcontrol;
 910                 else if (!strcmp(kcontrol->id.name, "CD Capture Switch"))
 911                         dummy->cd_switch_ctl = kcontrol;
 912
 913         }
 914         return 0;
 915 }
 916
 917 #if defined(CONFIG_SND_DEBUG) && defined(CONFIG_PROC_FS)
 918 /*
 919  * proc interface
 920  */
 921 static void print_formats(struct snd_dummy *dummy,
 922                           struct snd_info_buffer *buffer)
 923 {
 924         int i;
 925
 926         for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) {
 927                 if (dummy->pcm_hw.formats & (1ULL << i))
 928                         snd_iprintf(buffer, " %s", snd_pcm_format_name(i));
 929         }
 930 }
 931
 932 static void print_rates(struct snd_dummy *dummy,
 933                         struct snd_info_buffer *buffer)
 934 {
 935         static int rates[] = {
 936                 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000,
 937                 64000, 88200, 96000, 176400, 192000,
 938         };
 939         int i;
 940
 941         if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_CONTINUOUS)
 942                 snd_iprintf(buffer, " continuous");
 943         if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_KNOT)
 944                 snd_iprintf(buffer, " knot");
 945         for (i = 0; i < ARRAY_SIZE(rates); i++)
 946                 if (dummy->pcm_hw.rates & (1 << i))
 947                         snd_iprintf(buffer, " %d", rates[i]);
 948 }
 949
 950 #define get_dummy_int_ptr(dummy, ofs) \
 951         (unsigned int *)((char *)&((dummy)->pcm_hw) + (ofs))
 952 #define get_dummy_ll_ptr(dummy, ofs) \
 953         (unsigned long long *)((char *)&((dummy)->pcm_hw) + (ofs))
 954
 955 struct dummy_hw_field {
 956         const char *name;
 957         const char *format;
 958         unsigned int offset;
 959         unsigned int size;
 960 };
 961 #define FIELD_ENTRY(item, fmt) {                   \
 962         .name = #item,                             \
 963         .format = fmt,                             \
 964         .offset = offsetof(struct snd_pcm_hardware, item), \
 965         .size = sizeof(dummy_pcm_hardware.item) }
 966
 967 static struct dummy_hw_field fields[] = {
 968         FIELD_ENTRY(formats, "%#llx"),
 969         FIELD_ENTRY(rates, "%#x"),
 970         FIELD_ENTRY(rate_min, "%d"),
 971         FIELD_ENTRY(rate_max, "%d"),
 972         FIELD_ENTRY(channels_min, "%d"),
 973         FIELD_ENTRY(channels_max, "%d"),
 974         FIELD_ENTRY(buffer_bytes_max, "%ld"),
 975         FIELD_ENTRY(period_bytes_min, "%ld"),
 976         FIELD_ENTRY(period_bytes_max, "%ld"),
 977         FIELD_ENTRY(periods_min, "%d"),
 978         FIELD_ENTRY(periods_max, "%d"),
 979 };
 980
 981 static void dummy_proc_read(struct snd_info_entry *entry,
 982                             struct snd_info_buffer *buffer)
 983 {
 984         struct snd_dummy *dummy = entry->private_data;
 985         int i;
 986
 987         for (i = 0; i < ARRAY_SIZE(fields); i++) {
 988                 snd_iprintf(buffer, "%s ", fields[i].name);
 989                 if (fields[i].size == sizeof(int))
 990                         snd_iprintf(buffer, fields[i].format,
 991                                 *get_dummy_int_ptr(dummy, fields[i].offset));
 992                 else
 993                         snd_iprintf(buffer, fields[i].format,
 994                                 *get_dummy_ll_ptr(dummy, fields[i].offset));
 995                 if (!strcmp(fields[i].name, "formats"))
 996                         print_formats(dummy, buffer);
 997                 else if (!strcmp(fields[i].name, "rates"))
 998                         print_rates(dummy, buffer);
 999                 snd_iprintf(buffer, "\n");
1000         }
1001 }
1002
1003 static void dummy_proc_write(struct snd_info_entry *entry,
1004                              struct snd_info_buffer *buffer)
1005 {
1006         struct snd_dummy *dummy = entry->private_data;
1007         char line[64];
1008
1009         while (!snd_info_get_line(buffer, line, sizeof(line))) {
1010                 char item[20];
1011                 const char *ptr;
1012                 unsigned long long val;
1013                 int i;
1014
1015                 ptr = snd_info_get_str(item, line, sizeof(item));
1016                 for (i = 0; i < ARRAY_SIZE(fields); i++) {
1017                         if (!strcmp(item, fields[i].name))
1018                                 break;
1019                 }
1020                 if (i >= ARRAY_SIZE(fields))
1021                         continue;
1022                 snd_info_get_str(item, ptr, sizeof(item));
1023                 if (kstrtoull(item, 0, &val))
1024                         continue;
1025                 if (fields[i].size == sizeof(int))
1026                         *get_dummy_int_ptr(dummy, fields[i].offset) = val;
1027                 else
1028                         *get_dummy_ll_ptr(dummy, fields[i].offset) = val;
1029         }
1030 }
1031
1032 static void dummy_proc_init(struct snd_dummy *chip)
1033 {
1034         struct snd_info_entry *entry;
1035
1036         if (!snd_card_proc_new(chip->card, "dummy_pcm", &entry)) {
1037                 snd_info_set_text_ops(entry, chip, dummy_proc_read);
1038                 entry->c.text.write = dummy_proc_write;
1039                 entry->mode |= S_IWUSR;
1040                 entry->private_data = chip;
1041         }
1042 }
1043 #else
1044 #define dummy_proc_init(x)
1045 #endif /* CONFIG_SND_DEBUG && CONFIG_PROC_FS */
1046
1047 static int snd_dummy_probe(struct platform_device *devptr)
1048 {
1049         struct snd_card *card;
1050         struct snd_dummy *dummy;
1051         struct dummy_model *m = NULL, **mdl;
1052         int idx, err;
1053         int dev = devptr->id;
1054
1055         err = snd_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE,
1056                            sizeof(struct snd_dummy), &card);
1057         if (err < 0)
1058                 return err;
1059         dummy = card->private_data;
1060         dummy->card = card;
1061         for (mdl = dummy_models; *mdl && model[dev]; mdl++) {
1062                 if (strcmp(model[dev], (*mdl)->name) == 0) {
1063                         printk(KERN_INFO
1064                                 "snd-dummy: Using model '%s' for card %i\n",
1065                                 (*mdl)->name, card->number);
1066                         m = dummy->model = *mdl;
1067                         break;
1068                 }
1069         }
1070         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
1071                 if (pcm_substreams[dev] < 1)
1072                         pcm_substreams[dev] = 1;
1073                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
1074                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
1075                 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
1076                 if (err < 0)
1077                         goto __nodev;
1078         }
1079
1080         dummy->pcm_hw = dummy_pcm_hardware;
1081         if (m) {
1082                 if (m->formats)
1083                         dummy->pcm_hw.formats = m->formats;
1084                 if (m->buffer_bytes_max)
1085                         dummy->pcm_hw.buffer_bytes_max = m->buffer_bytes_max;
1086                 if (m->period_bytes_min)
1087                         dummy->pcm_hw.period_bytes_min = m->period_bytes_min;
1088                 if (m->period_bytes_max)
1089                         dummy->pcm_hw.period_bytes_max = m->period_bytes_max;
1090                 if (m->periods_min)
1091                         dummy->pcm_hw.periods_min = m->periods_min;
1092                 if (m->periods_max)
1093                         dummy->pcm_hw.periods_max = m->periods_max;
1094                 if (m->rates)
1095                         dummy->pcm_hw.rates = m->rates;
1096                 if (m->rate_min)
1097                         dummy->pcm_hw.rate_min = m->rate_min;
1098                 if (m->rate_max)
1099                         dummy->pcm_hw.rate_max = m->rate_max;
1100                 if (m->channels_min)
1101                         dummy->pcm_hw.channels_min = m->channels_min;
1102                 if (m->channels_max)
1103                         dummy->pcm_hw.channels_max = m->channels_max;
1104         }
1105
1106         err = snd_card_dummy_new_mixer(dummy);
1107         if (err < 0)
1108                 goto __nodev;
1109         strcpy(card->driver, "Dummy");
1110         strcpy(card->shortname, "Dummy");
1111         sprintf(card->longname, "Dummy %i", dev + 1);
1112
1113         dummy_proc_init(dummy);
1114
1115         err = snd_card_register(card);
1116         if (err == 0) {
1117                 platform_set_drvdata(devptr, card);
1118                 return 0;
1119         }
1120       __nodev:
1121         snd_card_free(card);
1122         return err;
1123 }
1124
1125 static int snd_dummy_remove(struct platform_device *devptr)
1126 {
1127         snd_card_free(platform_get_drvdata(devptr));
1128         return 0;
1129 }
1130
1131 #ifdef CONFIG_PM_SLEEP
1132 static int snd_dummy_suspend(struct device *pdev)
1133 {
1134         struct snd_card *card = dev_get_drvdata(pdev);
1135         struct snd_dummy *dummy = card->private_data;
1136
1137         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1138         snd_pcm_suspend_all(dummy->pcm);
1139         return 0;
1140 }
1141
1142 static int snd_dummy_resume(struct device *pdev)
1143 {
1144         struct snd_card *card = dev_get_drvdata(pdev);
1145
1146         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1147         return 0;
1148 }
1149
1150 static SIMPLE_DEV_PM_OPS(snd_dummy_pm, snd_dummy_suspend, snd_dummy_resume);
1151 #define SND_DUMMY_PM_OPS        &snd_dummy_pm
1152 #else
1153 #define SND_DUMMY_PM_OPS        NULL
1154 #endif
1155
1156 #define SND_DUMMY_DRIVER        "snd_dummy"
1157
1158 static struct platform_driver snd_dummy_driver = {
1159         .probe          = snd_dummy_probe,
1160         .remove         = snd_dummy_remove,
1161         .driver         = {
1162                 .name   = SND_DUMMY_DRIVER,
1163                 .pm     = SND_DUMMY_PM_OPS,
1164         },
1165 };
1166
1167 static void snd_dummy_unregister_all(void)
1168 {
1169         int i;
1170
1171         for (i = 0; i < ARRAY_SIZE(devices); ++i)
1172                 platform_device_unregister(devices[i]);
1173         platform_driver_unregister(&snd_dummy_driver);
1174         free_fake_buffer();
1175 }
1176
1177 static int __init alsa_card_dummy_init(void)
1178 {
1179         int i, cards, err;
1180
1181         err = platform_driver_register(&snd_dummy_driver);
1182         if (err < 0)
1183                 return err;
1184
1185         err = alloc_fake_buffer();
1186         if (err < 0) {
1187                 platform_driver_unregister(&snd_dummy_driver);
1188                 return err;
1189         }
1190
1191         cards = 0;
1192         for (i = 0; i < SNDRV_CARDS; i++) {
1193                 struct platform_device *device;
1194                 if (! enable[i])
1195                         continue;
1196                 device = platform_device_register_simple(SND_DUMMY_DRIVER,
1197                                                          i, NULL, 0);
1198                 if (IS_ERR(device))
1199                         continue;
1200                 if (!platform_get_drvdata(device)) {
1201                         platform_device_unregister(device);
1202                         continue;
1203                 }
1204                 devices[i] = device;
1205                 cards++;
1206         }
1207         if (!cards) {
1208 #ifdef MODULE
1209                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
1210 #endif
1211                 snd_dummy_unregister_all();
1212                 return -ENODEV;
1213         }
1214         return 0;
1215 }
1216
1217 static void __exit alsa_card_dummy_exit(void)
1218 {
1219         snd_dummy_unregister_all();
1220 }
1221
1222 module_init(alsa_card_dummy_init)
1223 module_exit(alsa_card_dummy_exit)