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         dpcm->timer.expires = jiffies +
 249                 (dpcm->frac_period_rest + dpcm->rate - 1) / dpcm->rate;
 250         add_timer(&dpcm->timer);
 251 }
 252
 253 static void dummy_systimer_update(struct dummy_systimer_pcm *dpcm)
 254 {
 255         unsigned long delta;
 256
 257         delta = jiffies - dpcm->base_time;
 258         if (!delta)
 259                 return;
 260         dpcm->base_time += delta;
 261         delta *= dpcm->rate;
 262         dpcm->frac_pos += delta;
 263         while (dpcm->frac_pos >= dpcm->frac_buffer_size)
 264                 dpcm->frac_pos -= dpcm->frac_buffer_size;
 265         while (dpcm->frac_period_rest <= delta) {
 266                 dpcm->elapsed++;
 267                 dpcm->frac_period_rest += dpcm->frac_period_size;
 268         }
 269         dpcm->frac_period_rest -= delta;
 270 }
 271
 272 static int dummy_systimer_start(struct snd_pcm_substream *substream)
 273 {
 274         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
 275         spin_lock(&dpcm->lock);
 276         dpcm->base_time = jiffies;
 277         dummy_systimer_rearm(dpcm);
 278         spin_unlock(&dpcm->lock);
 279         return 0;
 280 }
 281
 282 static int dummy_systimer_stop(struct snd_pcm_substream *substream)
 283 {
 284         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
 285         spin_lock(&dpcm->lock);
 286         del_timer(&dpcm->timer);
 287         spin_unlock(&dpcm->lock);
 288         return 0;
 289 }
 290
 291 static int dummy_systimer_prepare(struct snd_pcm_substream *substream)
 292 {
 293         struct snd_pcm_runtime *runtime = substream->runtime;
 294         struct dummy_systimer_pcm *dpcm = runtime->private_data;
 295
 296         dpcm->frac_pos = 0;
 297         dpcm->rate = runtime->rate;
 298         dpcm->frac_buffer_size = runtime->buffer_size * HZ;
 299         dpcm->frac_period_size = runtime->period_size * HZ;
 300         dpcm->frac_period_rest = dpcm->frac_period_size;
 301         dpcm->elapsed = 0;
 302
 303         return 0;
 304 }
 305
 306 static void dummy_systimer_callback(unsigned long data)
 307 {
 308         struct dummy_systimer_pcm *dpcm = (struct dummy_systimer_pcm *)data;
 309         unsigned long flags;
 310         int elapsed = 0;
 311
 312         spin_lock_irqsave(&dpcm->lock, flags);
 313         dummy_systimer_update(dpcm);
 314         dummy_systimer_rearm(dpcm);
 315         elapsed = dpcm->elapsed;
 316         dpcm->elapsed = 0;
 317         spin_unlock_irqrestore(&dpcm->lock, flags);
 318         if (elapsed)
 319                 snd_pcm_period_elapsed(dpcm->substream);
 320 }
 321
 322 static snd_pcm_uframes_t
 323 dummy_systimer_pointer(struct snd_pcm_substream *substream)
 324 {
 325         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
 326         snd_pcm_uframes_t pos;
 327
 328         spin_lock(&dpcm->lock);
 329         dummy_systimer_update(dpcm);
 330         pos = dpcm->frac_pos / HZ;
 331         spin_unlock(&dpcm->lock);
 332         return pos;
 333 }
 334
 335 static int dummy_systimer_create(struct snd_pcm_substream *substream)
 336 {
 337         struct dummy_systimer_pcm *dpcm;
 338
 339         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
 340         if (!dpcm)
 341                 return -ENOMEM;
 342         substream->runtime->private_data = dpcm;
 343         init_timer(&dpcm->timer);
 344         dpcm->timer.data = (unsigned long) dpcm;
 345         dpcm->timer.function = dummy_systimer_callback;
 346         spin_lock_init(&dpcm->lock);
 347         dpcm->substream = substream;
 348         return 0;
 349 }
 350
 351 static void dummy_systimer_free(struct snd_pcm_substream *substream)
 352 {
 353         kfree(substream->runtime->private_data);
 354 }
 355
 356 static struct dummy_timer_ops dummy_systimer_ops = {
 357         .create =       dummy_systimer_create,
 358         .free =         dummy_systimer_free,
 359         .prepare =      dummy_systimer_prepare,
 360         .start =        dummy_systimer_start,
 361         .stop =         dummy_systimer_stop,
 362         .pointer =      dummy_systimer_pointer,
 363 };
 364
 365 #ifdef CONFIG_HIGH_RES_TIMERS
 366 /*
 367  * hrtimer interface
 368  */
 369
 370 struct dummy_hrtimer_pcm {
 371         ktime_t base_time;
 372         ktime_t period_time;
 373         atomic_t running;
 374         struct hrtimer timer;
 375         struct tasklet_struct tasklet;
 376         struct snd_pcm_substream *substream;
 377 };
 378
 379 static void dummy_hrtimer_pcm_elapsed(unsigned long priv)
 380 {
 381         struct dummy_hrtimer_pcm *dpcm = (struct dummy_hrtimer_pcm *)priv;
 382         if (atomic_read(&dpcm->running))
 383                 snd_pcm_period_elapsed(dpcm->substream);
 384 }
 385
 386 static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer)
 387 {
 388         struct dummy_hrtimer_pcm *dpcm;
 389
 390         dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer);
 391         if (!atomic_read(&dpcm->running))
 392                 return HRTIMER_NORESTART;
 393         tasklet_schedule(&dpcm->tasklet);
 394         hrtimer_forward_now(timer, dpcm->period_time);
 395         return HRTIMER_RESTART;
 396 }
 397
 398 static int dummy_hrtimer_start(struct snd_pcm_substream *substream)
 399 {
 400         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
 401
 402         dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer);
 403         hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL);
 404         atomic_set(&dpcm->running, 1);
 405         return 0;
 406 }
 407
 408 static int dummy_hrtimer_stop(struct snd_pcm_substream *substream)
 409 {
 410         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
 411
 412         atomic_set(&dpcm->running, 0);
 413         hrtimer_cancel(&dpcm->timer);
 414         return 0;
 415 }
 416
 417 static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
 418 {
 419         tasklet_kill(&dpcm->tasklet);
 420 }
 421
 422 static snd_pcm_uframes_t
 423 dummy_hrtimer_pointer(struct snd_pcm_substream *substream)
 424 {
 425         struct snd_pcm_runtime *runtime = substream->runtime;
 426         struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
 427         u64 delta;
 428         u32 pos;
 429
 430         delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer),
 431                                dpcm->base_time);
 432         delta = div_u64(delta * runtime->rate + 999999, 1000000);
 433         div_u64_rem(delta, runtime->buffer_size, &pos);
 434         return pos;
 435 }
 436
 437 static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream)
 438 {
 439         struct snd_pcm_runtime *runtime = substream->runtime;
 440         struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
 441         unsigned int period, rate;
 442         long sec;
 443         unsigned long nsecs;
 444
 445         dummy_hrtimer_sync(dpcm);
 446         period = runtime->period_size;
 447         rate = runtime->rate;
 448         sec = period / rate;
 449         period %= rate;
 450         nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate);
 451         dpcm->period_time = ktime_set(sec, nsecs);
 452
 453         return 0;
 454 }
 455
 456 static int dummy_hrtimer_create(struct snd_pcm_substream *substream)
 457 {
 458         struct dummy_hrtimer_pcm *dpcm;
 459
 460         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
 461         if (!dpcm)
 462                 return -ENOMEM;
 463         substream->runtime->private_data = dpcm;
 464         hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 465         dpcm->timer.function = dummy_hrtimer_callback;
 466         dpcm->substream = substream;
 467         atomic_set(&dpcm->running, 0);
 468         tasklet_init(&dpcm->tasklet, dummy_hrtimer_pcm_elapsed,
 469                      (unsigned long)dpcm);
 470         return 0;
 471 }
 472
 473 static void dummy_hrtimer_free(struct snd_pcm_substream *substream)
 474 {
 475         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
 476         dummy_hrtimer_sync(dpcm);
 477         kfree(dpcm);
 478 }
 479
 480 static struct dummy_timer_ops dummy_hrtimer_ops = {
 481         .create =       dummy_hrtimer_create,
 482         .free =         dummy_hrtimer_free,
 483         .prepare =      dummy_hrtimer_prepare,
 484         .start =        dummy_hrtimer_start,
 485         .stop =         dummy_hrtimer_stop,
 486         .pointer =      dummy_hrtimer_pointer,
 487 };
 488
 489 #endif /* CONFIG_HIGH_RES_TIMERS */
 490
 491 /*
 492  * PCM interface
 493  */
 494
 495 static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 496 {
 497         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
 498
 499         switch (cmd) {
 500         case SNDRV_PCM_TRIGGER_START:
 501         case SNDRV_PCM_TRIGGER_RESUME:
 502                 return dummy->timer_ops->start(substream);
 503         case SNDRV_PCM_TRIGGER_STOP:
 504         case SNDRV_PCM_TRIGGER_SUSPEND:
 505                 return dummy->timer_ops->stop(substream);
 506         }
 507         return -EINVAL;
 508 }
 509
 510 static int dummy_pcm_prepare(struct snd_pcm_substream *substream)
 511 {
 512         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
 513
 514         return dummy->timer_ops->prepare(substream);
 515 }
 516
 517 static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream)
 518 {
 519         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
 520
 521         return dummy->timer_ops->pointer(substream);
 522 }
 523
 524 static struct snd_pcm_hardware dummy_pcm_hardware = {
 525         .info =                 (SNDRV_PCM_INFO_MMAP |
 526                                  SNDRV_PCM_INFO_INTERLEAVED |
 527                                  SNDRV_PCM_INFO_RESUME |
 528                                  SNDRV_PCM_INFO_MMAP_VALID),
 529         .formats =              USE_FORMATS,
 530         .rates =                USE_RATE,
 531         .rate_min =             USE_RATE_MIN,
 532         .rate_max =             USE_RATE_MAX,
 533         .channels_min =         USE_CHANNELS_MIN,
 534         .channels_max =         USE_CHANNELS_MAX,
 535         .buffer_bytes_max =     MAX_BUFFER_SIZE,
 536         .period_bytes_min =     MIN_PERIOD_SIZE,
 537         .period_bytes_max =     MAX_PERIOD_SIZE,
 538         .periods_min =          USE_PERIODS_MIN,
 539         .periods_max =          USE_PERIODS_MAX,
 540         .fifo_size =            0,
 541 };
 542
 543 static int dummy_pcm_hw_params(struct snd_pcm_substream *substream,
 544                                struct snd_pcm_hw_params *hw_params)
 545 {
 546         if (fake_buffer) {
 547                 /* runtime->dma_bytes has to be set manually to allow mmap */
 548                 substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
 549                 return 0;
 550         }
 551         return snd_pcm_lib_malloc_pages(substream,
 552                                         params_buffer_bytes(hw_params));
 553 }
 554
 555 static int dummy_pcm_hw_free(struct snd_pcm_substream *substream)
 556 {
 557         if (fake_buffer)
 558                 return 0;
 559         return snd_pcm_lib_free_pages(substream);
 560 }
 561
 562 static int dummy_pcm_open(struct snd_pcm_substream *substream)
 563 {
 564         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
 565         struct dummy_model *model = dummy->model;
 566         struct snd_pcm_runtime *runtime = substream->runtime;
 567         int err;
 568
 569         dummy->timer_ops = &dummy_systimer_ops;
 570 #ifdef CONFIG_HIGH_RES_TIMERS
 571         if (hrtimer)
 572                 dummy->timer_ops = &dummy_hrtimer_ops;
 573 #endif
 574
 575         err = dummy->timer_ops->create(substream);
 576         if (err < 0)
 577                 return err;
 578
 579         runtime->hw = dummy->pcm_hw;
 580         if (substream->pcm->device & 1) {
 581                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 582                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 583         }
 584         if (substream->pcm->device & 2)
 585                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
 586                                       SNDRV_PCM_INFO_MMAP_VALID);
 587
 588         if (model == NULL)
 589                 return 0;
 590
 591         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 592                 if (model->playback_constraints)
 593                         err = model->playback_constraints(substream->runtime);
 594         } else {
 595                 if (model->capture_constraints)
 596                         err = model->capture_constraints(substream->runtime);
 597         }
 598         if (err < 0) {
 599                 dummy->timer_ops->free(substream);
 600                 return err;
 601         }
 602         return 0;
 603 }
 604
 605 static int dummy_pcm_close(struct snd_pcm_substream *substream)
 606 {
 607         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
 608         dummy->timer_ops->free(substream);
 609         return 0;
 610 }
 611
 612 /*
 613  * dummy buffer handling
 614  */
 615
 616 static void *dummy_page[2];
 617
 618 static void free_fake_buffer(void)
 619 {
 620         if (fake_buffer) {
 621                 int i;
 622                 for (i = 0; i < 2; i++)
 623                         if (dummy_page[i]) {
 624                                 free_page((unsigned long)dummy_page[i]);
 625                                 dummy_page[i] = NULL;
 626                         }
 627         }
 628 }
 629
 630 static int alloc_fake_buffer(void)
 631 {
 632         int i;
 633
 634         if (!fake_buffer)
 635                 return 0;
 636         for (i = 0; i < 2; i++) {
 637                 dummy_page[i] = (void *)get_zeroed_page(GFP_KERNEL);
 638                 if (!dummy_page[i]) {
 639                         free_fake_buffer();
 640                         return -ENOMEM;
 641                 }
 642         }
 643         return 0;
 644 }
 645
 646 static int dummy_pcm_copy(struct snd_pcm_substream *substream,
 647                           int channel, snd_pcm_uframes_t pos,
 648                           void __user *dst, snd_pcm_uframes_t count)
 649 {
 650         return 0; /* do nothing */
 651 }
 652
 653 static int dummy_pcm_silence(struct snd_pcm_substream *substream,
 654                              int channel, snd_pcm_uframes_t pos,
 655                              snd_pcm_uframes_t count)
 656 {
 657         return 0; /* do nothing */
 658 }
 659
 660 static struct page *dummy_pcm_page(struct snd_pcm_substream *substream,
 661                                    unsigned long offset)
 662 {
 663         return virt_to_page(dummy_page[substream->stream]); /* the same page */
 664 }
 665
 666 static struct snd_pcm_ops dummy_pcm_ops = {
 667         .open =         dummy_pcm_open,
 668         .close =        dummy_pcm_close,
 669         .ioctl =        snd_pcm_lib_ioctl,
 670         .hw_params =    dummy_pcm_hw_params,
 671         .hw_free =      dummy_pcm_hw_free,
 672         .prepare =      dummy_pcm_prepare,
 673         .trigger =      dummy_pcm_trigger,
 674         .pointer =      dummy_pcm_pointer,
 675 };
 676
 677 static struct snd_pcm_ops dummy_pcm_ops_no_buf = {
 678         .open =         dummy_pcm_open,
 679         .close =        dummy_pcm_close,
 680         .ioctl =        snd_pcm_lib_ioctl,
 681         .hw_params =    dummy_pcm_hw_params,
 682         .hw_free =      dummy_pcm_hw_free,
 683         .prepare =      dummy_pcm_prepare,
 684         .trigger =      dummy_pcm_trigger,
 685         .pointer =      dummy_pcm_pointer,
 686         .copy =         dummy_pcm_copy,
 687         .silence =      dummy_pcm_silence,
 688         .page =         dummy_pcm_page,
 689 };
 690
 691 static int snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
 692                               int substreams)
 693 {
 694         struct snd_pcm *pcm;
 695         struct snd_pcm_ops *ops;
 696         int err;
 697
 698         err = snd_pcm_new(dummy->card, "Dummy PCM", device,
 699                                substreams, substreams, &pcm);
 700         if (err < 0)
 701                 return err;
 702         dummy->pcm = pcm;
 703         if (fake_buffer)
 704                 ops = &dummy_pcm_ops_no_buf;
 705         else
 706                 ops = &dummy_pcm_ops;
 707         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, ops);
 708         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, ops);
 709         pcm->private_data = dummy;
 710         pcm->info_flags = 0;
 711         strcpy(pcm->name, "Dummy PCM");
 712         if (!fake_buffer) {
 713                 snd_pcm_lib_preallocate_pages_for_all(pcm,
 714                         SNDRV_DMA_TYPE_CONTINUOUS,
 715                         snd_dma_continuous_data(GFP_KERNEL),
 716                         0, 64*1024);
 717         }
 718         return 0;
 719 }
 720
 721 /*
 722  * mixer interface
 723  */
 724
 725 #define DUMMY_VOLUME(xname, xindex, addr) \
 726 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
 727   .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
 728   .name = xname, .index = xindex, \
 729   .info = snd_dummy_volume_info, \
 730   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
 731   .private_value = addr, \
 732   .tlv = { .p = db_scale_dummy } }
 733
 734 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
 735                                  struct snd_ctl_elem_info *uinfo)
 736 {
 737         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 738         uinfo->count = 2;
 739         uinfo->value.integer.min = -50;
 740         uinfo->value.integer.max = 100;
 741         return 0;
 742 }
 743
 744 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
 745                                 struct snd_ctl_elem_value *ucontrol)
 746 {
 747         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 748         int addr = kcontrol->private_value;
 749
 750         spin_lock_irq(&dummy->mixer_lock);
 751         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
 752         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
 753         spin_unlock_irq(&dummy->mixer_lock);
 754         return 0;
 755 }
 756
 757 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
 758                                 struct snd_ctl_elem_value *ucontrol)
 759 {
 760         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 761         int change, addr = kcontrol->private_value;
 762         int left, right;
 763
 764         left = ucontrol->value.integer.value[0];
 765         if (left < -50)
 766                 left = -50;
 767         if (left > 100)
 768                 left = 100;
 769         right = ucontrol->value.integer.value[1];
 770         if (right < -50)
 771                 right = -50;
 772         if (right > 100)
 773                 right = 100;
 774         spin_lock_irq(&dummy->mixer_lock);
 775         change = dummy->mixer_volume[addr][0] != left ||
 776                  dummy->mixer_volume[addr][1] != right;
 777         dummy->mixer_volume[addr][0] = left;
 778         dummy->mixer_volume[addr][1] = right;
 779         spin_unlock_irq(&dummy->mixer_lock);
 780         return change;
 781 }
 782
 783 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
 784
 785 #define DUMMY_CAPSRC(xname, xindex, addr) \
 786 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 787   .info = snd_dummy_capsrc_info, \
 788   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
 789   .private_value = addr }
 790
 791 #define snd_dummy_capsrc_info   snd_ctl_boolean_stereo_info
 792
 793 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
 794                                 struct snd_ctl_elem_value *ucontrol)
 795 {
 796         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 797         int addr = kcontrol->private_value;
 798
 799         spin_lock_irq(&dummy->mixer_lock);
 800         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
 801         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
 802         spin_unlock_irq(&dummy->mixer_lock);
 803         return 0;
 804 }
 805
 806 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 807 {
 808         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 809         int change, addr = kcontrol->private_value;
 810         int left, right;
 811
 812         left = ucontrol->value.integer.value[0] & 1;
 813         right = ucontrol->value.integer.value[1] & 1;
 814         spin_lock_irq(&dummy->mixer_lock);
 815         change = dummy->capture_source[addr][0] != left &&
 816                  dummy->capture_source[addr][1] != right;
 817         dummy->capture_source[addr][0] = left;
 818         dummy->capture_source[addr][1] = right;
 819         spin_unlock_irq(&dummy->mixer_lock);
 820         return change;
 821 }
 822
 823 static int snd_dummy_iobox_info(struct snd_kcontrol *kcontrol,
 824                                 struct snd_ctl_elem_info *info)
 825 {
 826         const char *const names[] = { "None", "CD Player" };
 827
 828         return snd_ctl_enum_info(info, 1, 2, names);
 829 }
 830
 831 static int snd_dummy_iobox_get(struct snd_kcontrol *kcontrol,
 832                                struct snd_ctl_elem_value *value)
 833 {
 834         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 835
 836         value->value.enumerated.item[0] = dummy->iobox;
 837         return 0;
 838 }
 839
 840 static int snd_dummy_iobox_put(struct snd_kcontrol *kcontrol,
 841                                struct snd_ctl_elem_value *value)
 842 {
 843         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 844         int changed;
 845
 846         if (value->value.enumerated.item[0] > 1)
 847                 return -EINVAL;
 848
 849         changed = value->value.enumerated.item[0] != dummy->iobox;
 850         if (changed) {
 851                 dummy->iobox = value->value.enumerated.item[0];
 852
 853                 if (dummy->iobox) {
 854                         dummy->cd_volume_ctl->vd[0].access &=
 855                                 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
 856                         dummy->cd_switch_ctl->vd[0].access &=
 857                                 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
 858                 } else {
 859                         dummy->cd_volume_ctl->vd[0].access |=
 860                                 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
 861                         dummy->cd_switch_ctl->vd[0].access |=
 862                                 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
 863                 }
 864
 865                 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
 866                                &dummy->cd_volume_ctl->id);
 867                 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
 868                                &dummy->cd_switch_ctl->id);
 869         }
 870
 871         return changed;
 872 }
 873
 874 static struct snd_kcontrol_new snd_dummy_controls[] = {
 875 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
 876 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
 877 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
 878 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
 879 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
 880 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
 881 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
 882 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
 883 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
 884 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD),
 885 {
 886         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 887         .name  = "External I/O Box",
 888         .info  = snd_dummy_iobox_info,
 889         .get   = snd_dummy_iobox_get,
 890         .put   = snd_dummy_iobox_put,
 891 },
 892 };
 893
 894 static int snd_card_dummy_new_mixer(struct snd_dummy *dummy)
 895 {
 896         struct snd_card *card = dummy->card;
 897         struct snd_kcontrol *kcontrol;
 898         unsigned int idx;
 899         int err;
 900
 901         spin_lock_init(&dummy->mixer_lock);
 902         strcpy(card->mixername, "Dummy Mixer");
 903         dummy->iobox = 1;
 904
 905         for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
 906                 kcontrol = snd_ctl_new1(&snd_dummy_controls[idx], dummy);
 907                 err = snd_ctl_add(card, kcontrol);
 908                 if (err < 0)
 909                         return err;
 910                 if (!strcmp(kcontrol->id.name, "CD Volume"))
 911                         dummy->cd_volume_ctl = kcontrol;
 912                 else if (!strcmp(kcontrol->id.name, "CD Capture Switch"))
 913                         dummy->cd_switch_ctl = kcontrol;
 914
 915         }
 916         return 0;
 917 }
 918
 919 #if defined(CONFIG_SND_DEBUG) && defined(CONFIG_PROC_FS)
 920 /*
 921  * proc interface
 922  */
 923 static void print_formats(struct snd_dummy *dummy,
 924                           struct snd_info_buffer *buffer)
 925 {
 926         int i;
 927
 928         for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) {
 929                 if (dummy->pcm_hw.formats & (1ULL << i))
 930                         snd_iprintf(buffer, " %s", snd_pcm_format_name(i));
 931         }
 932 }
 933
 934 static void print_rates(struct snd_dummy *dummy,
 935                         struct snd_info_buffer *buffer)
 936 {
 937         static int rates[] = {
 938                 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000,
 939                 64000, 88200, 96000, 176400, 192000,
 940         };
 941         int i;
 942
 943         if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_CONTINUOUS)
 944                 snd_iprintf(buffer, " continuous");
 945         if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_KNOT)
 946                 snd_iprintf(buffer, " knot");
 947         for (i = 0; i < ARRAY_SIZE(rates); i++)
 948                 if (dummy->pcm_hw.rates & (1 << i))
 949                         snd_iprintf(buffer, " %d", rates[i]);
 950 }
 951
 952 #define get_dummy_int_ptr(dummy, ofs) \
 953         (unsigned int *)((char *)&((dummy)->pcm_hw) + (ofs))
 954 #define get_dummy_ll_ptr(dummy, ofs) \
 955         (unsigned long long *)((char *)&((dummy)->pcm_hw) + (ofs))
 956
 957 struct dummy_hw_field {
 958         const char *name;
 959         const char *format;
 960         unsigned int offset;
 961         unsigned int size;
 962 };
 963 #define FIELD_ENTRY(item, fmt) {                   \
 964         .name = #item,                             \
 965         .format = fmt,                             \
 966         .offset = offsetof(struct snd_pcm_hardware, item), \
 967         .size = sizeof(dummy_pcm_hardware.item) }
 968
 969 static struct dummy_hw_field fields[] = {
 970         FIELD_ENTRY(formats, "%#llx"),
 971         FIELD_ENTRY(rates, "%#x"),
 972         FIELD_ENTRY(rate_min, "%d"),
 973         FIELD_ENTRY(rate_max, "%d"),
 974         FIELD_ENTRY(channels_min, "%d"),
 975         FIELD_ENTRY(channels_max, "%d"),
 976         FIELD_ENTRY(buffer_bytes_max, "%ld"),
 977         FIELD_ENTRY(period_bytes_min, "%ld"),
 978         FIELD_ENTRY(period_bytes_max, "%ld"),
 979         FIELD_ENTRY(periods_min, "%d"),
 980         FIELD_ENTRY(periods_max, "%d"),
 981 };
 982
 983 static void dummy_proc_read(struct snd_info_entry *entry,
 984                             struct snd_info_buffer *buffer)
 985 {
 986         struct snd_dummy *dummy = entry->private_data;
 987         int i;
 988
 989         for (i = 0; i < ARRAY_SIZE(fields); i++) {
 990                 snd_iprintf(buffer, "%s ", fields[i].name);
 991                 if (fields[i].size == sizeof(int))
 992                         snd_iprintf(buffer, fields[i].format,
 993                                 *get_dummy_int_ptr(dummy, fields[i].offset));
 994                 else
 995                         snd_iprintf(buffer, fields[i].format,
 996                                 *get_dummy_ll_ptr(dummy, fields[i].offset));
 997                 if (!strcmp(fields[i].name, "formats"))
 998                         print_formats(dummy, buffer);
 999                 else if (!strcmp(fields[i].name, "rates"))
1000                         print_rates(dummy, buffer);
1001                 snd_iprintf(buffer, "\n");
1002         }
1003 }
1004
1005 static void dummy_proc_write(struct snd_info_entry *entry,
1006                              struct snd_info_buffer *buffer)
1007 {
1008         struct snd_dummy *dummy = entry->private_data;
1009         char line[64];
1010
1011         while (!snd_info_get_line(buffer, line, sizeof(line))) {
1012                 char item[20];
1013                 const char *ptr;
1014                 unsigned long long val;
1015                 int i;
1016
1017                 ptr = snd_info_get_str(item, line, sizeof(item));
1018                 for (i = 0; i < ARRAY_SIZE(fields); i++) {
1019                         if (!strcmp(item, fields[i].name))
1020                                 break;
1021                 }
1022                 if (i >= ARRAY_SIZE(fields))
1023                         continue;
1024                 snd_info_get_str(item, ptr, sizeof(item));
1025                 if (kstrtoull(item, 0, &val))
1026                         continue;
1027                 if (fields[i].size == sizeof(int))
1028                         *get_dummy_int_ptr(dummy, fields[i].offset) = val;
1029                 else
1030                         *get_dummy_ll_ptr(dummy, fields[i].offset) = val;
1031         }
1032 }
1033
1034 static void dummy_proc_init(struct snd_dummy *chip)
1035 {
1036         struct snd_info_entry *entry;
1037
1038         if (!snd_card_proc_new(chip->card, "dummy_pcm", &entry)) {
1039                 snd_info_set_text_ops(entry, chip, dummy_proc_read);
1040                 entry->c.text.write = dummy_proc_write;
1041                 entry->mode |= S_IWUSR;
1042                 entry->private_data = chip;
1043         }
1044 }
1045 #else
1046 #define dummy_proc_init(x)
1047 #endif /* CONFIG_SND_DEBUG && CONFIG_PROC_FS */
1048
1049 static int snd_dummy_probe(struct platform_device *devptr)
1050 {
1051         struct snd_card *card;
1052         struct snd_dummy *dummy;
1053         struct dummy_model *m = NULL, **mdl;
1054         int idx, err;
1055         int dev = devptr->id;
1056
1057         err = snd_card_create(index[dev], id[dev], THIS_MODULE,
1058                               sizeof(struct snd_dummy), &card);
1059         if (err < 0)
1060                 return err;
1061         dummy = card->private_data;
1062         dummy->card = card;
1063         for (mdl = dummy_models; *mdl && model[dev]; mdl++) {
1064                 if (strcmp(model[dev], (*mdl)->name) == 0) {
1065                         printk(KERN_INFO
1066                                 "snd-dummy: Using model '%s' for card %i\n",
1067                                 (*mdl)->name, card->number);
1068                         m = dummy->model = *mdl;
1069                         break;
1070                 }
1071         }
1072         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
1073                 if (pcm_substreams[dev] < 1)
1074                         pcm_substreams[dev] = 1;
1075                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
1076                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
1077                 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
1078                 if (err < 0)
1079                         goto __nodev;
1080         }
1081
1082         dummy->pcm_hw = dummy_pcm_hardware;
1083         if (m) {
1084                 if (m->formats)
1085                         dummy->pcm_hw.formats = m->formats;
1086                 if (m->buffer_bytes_max)
1087                         dummy->pcm_hw.buffer_bytes_max = m->buffer_bytes_max;
1088                 if (m->period_bytes_min)
1089                         dummy->pcm_hw.period_bytes_min = m->period_bytes_min;
1090                 if (m->period_bytes_max)
1091                         dummy->pcm_hw.period_bytes_max = m->period_bytes_max;
1092                 if (m->periods_min)
1093                         dummy->pcm_hw.periods_min = m->periods_min;
1094                 if (m->periods_max)
1095                         dummy->pcm_hw.periods_max = m->periods_max;
1096                 if (m->rates)
1097                         dummy->pcm_hw.rates = m->rates;
1098                 if (m->rate_min)
1099                         dummy->pcm_hw.rate_min = m->rate_min;
1100                 if (m->rate_max)
1101                         dummy->pcm_hw.rate_max = m->rate_max;
1102                 if (m->channels_min)
1103                         dummy->pcm_hw.channels_min = m->channels_min;
1104                 if (m->channels_max)
1105                         dummy->pcm_hw.channels_max = m->channels_max;
1106         }
1107
1108         err = snd_card_dummy_new_mixer(dummy);
1109         if (err < 0)
1110                 goto __nodev;
1111         strcpy(card->driver, "Dummy");
1112         strcpy(card->shortname, "Dummy");
1113         sprintf(card->longname, "Dummy %i", dev + 1);
1114
1115         dummy_proc_init(dummy);
1116
1117         snd_card_set_dev(card, &devptr->dev);
1118
1119         err = snd_card_register(card);
1120         if (err == 0) {
1121                 platform_set_drvdata(devptr, card);
1122                 return 0;
1123         }
1124       __nodev:
1125         snd_card_free(card);
1126         return err;
1127 }
1128
1129 static int snd_dummy_remove(struct platform_device *devptr)
1130 {
1131         snd_card_free(platform_get_drvdata(devptr));
1132         return 0;
1133 }
1134
1135 #ifdef CONFIG_PM_SLEEP
1136 static int snd_dummy_suspend(struct device *pdev)
1137 {
1138         struct snd_card *card = dev_get_drvdata(pdev);
1139         struct snd_dummy *dummy = card->private_data;
1140
1141         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1142         snd_pcm_suspend_all(dummy->pcm);
1143         return 0;
1144 }
1145
1146 static int snd_dummy_resume(struct device *pdev)
1147 {
1148         struct snd_card *card = dev_get_drvdata(pdev);
1149
1150         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1151         return 0;
1152 }
1153
1154 static SIMPLE_DEV_PM_OPS(snd_dummy_pm, snd_dummy_suspend, snd_dummy_resume);
1155 #define SND_DUMMY_PM_OPS        &snd_dummy_pm
1156 #else
1157 #define SND_DUMMY_PM_OPS        NULL
1158 #endif
1159
1160 #define SND_DUMMY_DRIVER        "snd_dummy"
1161
1162 static struct platform_driver snd_dummy_driver = {
1163         .probe          = snd_dummy_probe,
1164         .remove         = snd_dummy_remove,
1165         .driver         = {
1166                 .name   = SND_DUMMY_DRIVER,
1167                 .owner  = THIS_MODULE,
1168                 .pm     = SND_DUMMY_PM_OPS,
1169         },
1170 };
1171
1172 static void snd_dummy_unregister_all(void)
1173 {
1174         int i;
1175
1176         for (i = 0; i < ARRAY_SIZE(devices); ++i)
1177                 platform_device_unregister(devices[i]);
1178         platform_driver_unregister(&snd_dummy_driver);
1179         free_fake_buffer();
1180 }
1181
1182 static int __init alsa_card_dummy_init(void)
1183 {
1184         int i, cards, err;
1185
1186         err = platform_driver_register(&snd_dummy_driver);
1187         if (err < 0)
1188                 return err;
1189
1190         err = alloc_fake_buffer();
1191         if (err < 0) {
1192                 platform_driver_unregister(&snd_dummy_driver);
1193                 return err;
1194         }
1195
1196         cards = 0;
1197         for (i = 0; i < SNDRV_CARDS; i++) {
1198                 struct platform_device *device;
1199                 if (! enable[i])
1200                         continue;
1201                 device = platform_device_register_simple(SND_DUMMY_DRIVER,
1202                                                          i, NULL, 0);
1203                 if (IS_ERR(device))
1204                         continue;
1205                 if (!platform_get_drvdata(device)) {
1206                         platform_device_unregister(device);
1207                         continue;
1208                 }
1209                 devices[i] = device;
1210                 cards++;
1211         }
1212         if (!cards) {
1213 #ifdef MODULE
1214                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
1215 #endif
1216                 snd_dummy_unregister_all();
1217                 return -ENODEV;
1218         }
1219         return 0;
1220 }
1221
1222 static void __exit alsa_card_dummy_exit(void)
1223 {
1224         snd_dummy_unregister_all();
1225 }
1226
1227 module_init(alsa_card_dummy_init)
1228 module_exit(alsa_card_dummy_exit)