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 #define get_dummy_ops(substream) \
 113         (*(const struct dummy_timer_ops **)(substream)->runtime->private_data)
 114
 115 struct dummy_model {
 116         const char *name;
 117         int (*playback_constraints)(struct snd_pcm_runtime *runtime);
 118         int (*capture_constraints)(struct snd_pcm_runtime *runtime);
 119         u64 formats;
 120         size_t buffer_bytes_max;
 121         size_t period_bytes_min;
 122         size_t period_bytes_max;
 123         unsigned int periods_min;
 124         unsigned int periods_max;
 125         unsigned int rates;
 126         unsigned int rate_min;
 127         unsigned int rate_max;
 128         unsigned int channels_min;
 129         unsigned int channels_max;
 130 };
 131
 132 struct snd_dummy {
 133         struct snd_card *card;
 134         struct dummy_model *model;
 135         struct snd_pcm *pcm;
 136         struct snd_pcm_hardware pcm_hw;
 137         spinlock_t mixer_lock;
 138         int mixer_volume[MIXER_ADDR_LAST+1][2];
 139         int capture_source[MIXER_ADDR_LAST+1][2];
 140         int iobox;
 141         struct snd_kcontrol *cd_volume_ctl;
 142         struct snd_kcontrol *cd_switch_ctl;
 143 };
 144
 145 /*
 146  * card models
 147  */
 148
 149 static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime)
 150 {
 151         int err;
 152         err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 153         if (err < 0)
 154                 return err;
 155         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX);
 156         if (err < 0)
 157                 return err;
 158         return 0;
 159 }
 160
 161 static struct dummy_model model_emu10k1 = {
 162         .name = "emu10k1",
 163         .playback_constraints = emu10k1_playback_constraints,
 164         .buffer_bytes_max = 128 * 1024,
 165 };
 166
 167 static struct dummy_model model_rme9652 = {
 168         .name = "rme9652",
 169         .buffer_bytes_max = 26 * 64 * 1024,
 170         .formats = SNDRV_PCM_FMTBIT_S32_LE,
 171         .channels_min = 26,
 172         .channels_max = 26,
 173         .periods_min = 2,
 174         .periods_max = 2,
 175 };
 176
 177 static struct dummy_model model_ice1712 = {
 178         .name = "ice1712",
 179         .buffer_bytes_max = 256 * 1024,
 180         .formats = SNDRV_PCM_FMTBIT_S32_LE,
 181         .channels_min = 10,
 182         .channels_max = 10,
 183         .periods_min = 1,
 184         .periods_max = 1024,
 185 };
 186
 187 static struct dummy_model model_uda1341 = {
 188         .name = "uda1341",
 189         .buffer_bytes_max = 16380,
 190         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 191         .channels_min = 2,
 192         .channels_max = 2,
 193         .periods_min = 2,
 194         .periods_max = 255,
 195 };
 196
 197 static struct dummy_model model_ac97 = {
 198         .name = "ac97",
 199         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 200         .channels_min = 2,
 201         .channels_max = 2,
 202         .rates = SNDRV_PCM_RATE_48000,
 203         .rate_min = 48000,
 204         .rate_max = 48000,
 205 };
 206
 207 static struct dummy_model model_ca0106 = {
 208         .name = "ca0106",
 209         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 210         .buffer_bytes_max = ((65536-64)*8),
 211         .period_bytes_max = (65536-64),
 212         .periods_min = 2,
 213         .periods_max = 8,
 214         .channels_min = 2,
 215         .channels_max = 2,
 216         .rates = SNDRV_PCM_RATE_48000|SNDRV_PCM_RATE_96000|SNDRV_PCM_RATE_192000,
 217         .rate_min = 48000,
 218         .rate_max = 192000,
 219 };
 220
 221 static struct dummy_model *dummy_models[] = {
 222         &model_emu10k1,
 223         &model_rme9652,
 224         &model_ice1712,
 225         &model_uda1341,
 226         &model_ac97,
 227         &model_ca0106,
 228         NULL
 229 };
 230
 231 /*
 232  * system timer interface
 233  */
 234
 235 struct dummy_systimer_pcm {
 236         /* ops must be the first item */
 237         const struct dummy_timer_ops *timer_ops;
 238         spinlock_t lock;
 239         struct timer_list timer;
 240         unsigned long base_time;
 241         unsigned int frac_pos;  /* fractional sample position (based HZ) */
 242         unsigned int frac_period_rest;
 243         unsigned int frac_buffer_size;  /* buffer_size * HZ */
 244         unsigned int frac_period_size;  /* period_size * HZ */
 245         unsigned int rate;
 246         int elapsed;
 247         struct snd_pcm_substream *substream;
 248 };
 249
 250 static void dummy_systimer_rearm(struct dummy_systimer_pcm *dpcm)
 251 {
 252         mod_timer(&dpcm->timer, jiffies +
 253                 (dpcm->frac_period_rest + dpcm->rate - 1) / dpcm->rate);
 254 }
 255
 256 static void dummy_systimer_update(struct dummy_systimer_pcm *dpcm)
 257 {
 258         unsigned long delta;
 259
 260         delta = jiffies - dpcm->base_time;
 261         if (!delta)
 262                 return;
 263         dpcm->base_time += delta;
 264         delta *= dpcm->rate;
 265         dpcm->frac_pos += delta;
 266         while (dpcm->frac_pos >= dpcm->frac_buffer_size)
 267                 dpcm->frac_pos -= dpcm->frac_buffer_size;
 268         while (dpcm->frac_period_rest <= delta) {
 269                 dpcm->elapsed++;
 270                 dpcm->frac_period_rest += dpcm->frac_period_size;
 271         }
 272         dpcm->frac_period_rest -= delta;
 273 }
 274
 275 static int dummy_systimer_start(struct snd_pcm_substream *substream)
 276 {
 277         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
 278         spin_lock(&dpcm->lock);
 279         dpcm->base_time = jiffies;
 280         dummy_systimer_rearm(dpcm);
 281         spin_unlock(&dpcm->lock);
 282         return 0;
 283 }
 284
 285 static int dummy_systimer_stop(struct snd_pcm_substream *substream)
 286 {
 287         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
 288         spin_lock(&dpcm->lock);
 289         del_timer(&dpcm->timer);
 290         spin_unlock(&dpcm->lock);
 291         return 0;
 292 }
 293
 294 static int dummy_systimer_prepare(struct snd_pcm_substream *substream)
 295 {
 296         struct snd_pcm_runtime *runtime = substream->runtime;
 297         struct dummy_systimer_pcm *dpcm = runtime->private_data;
 298
 299         dpcm->frac_pos = 0;
 300         dpcm->rate = runtime->rate;
 301         dpcm->frac_buffer_size = runtime->buffer_size * HZ;
 302         dpcm->frac_period_size = runtime->period_size * HZ;
 303         dpcm->frac_period_rest = dpcm->frac_period_size;
 304         dpcm->elapsed = 0;
 305
 306         return 0;
 307 }
 308
 309 static void dummy_systimer_callback(struct timer_list *t)
 310 {
 311         struct dummy_systimer_pcm *dpcm = from_timer(dpcm, t, timer);
 312         unsigned long flags;
 313         int elapsed = 0;
 314
 315         spin_lock_irqsave(&dpcm->lock, flags);
 316         dummy_systimer_update(dpcm);
 317         dummy_systimer_rearm(dpcm);
 318         elapsed = dpcm->elapsed;
 319         dpcm->elapsed = 0;
 320         spin_unlock_irqrestore(&dpcm->lock, flags);
 321         if (elapsed)
 322                 snd_pcm_period_elapsed(dpcm->substream);
 323 }
 324
 325 static snd_pcm_uframes_t
 326 dummy_systimer_pointer(struct snd_pcm_substream *substream)
 327 {
 328         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
 329         snd_pcm_uframes_t pos;
 330
 331         spin_lock(&dpcm->lock);
 332         dummy_systimer_update(dpcm);
 333         pos = dpcm->frac_pos / HZ;
 334         spin_unlock(&dpcm->lock);
 335         return pos;
 336 }
 337
 338 static int dummy_systimer_create(struct snd_pcm_substream *substream)
 339 {
 340         struct dummy_systimer_pcm *dpcm;
 341
 342         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
 343         if (!dpcm)
 344                 return -ENOMEM;
 345         substream->runtime->private_data = dpcm;
 346         timer_setup(&dpcm->timer, dummy_systimer_callback, 0);
 347         spin_lock_init(&dpcm->lock);
 348         dpcm->substream = substream;
 349         return 0;
 350 }
 351
 352 static void dummy_systimer_free(struct snd_pcm_substream *substream)
 353 {
 354         kfree(substream->runtime->private_data);
 355 }
 356
 357 static const struct dummy_timer_ops dummy_systimer_ops = {
 358         .create =       dummy_systimer_create,
 359         .free =         dummy_systimer_free,
 360         .prepare =      dummy_systimer_prepare,
 361         .start =        dummy_systimer_start,
 362         .stop =         dummy_systimer_stop,
 363         .pointer =      dummy_systimer_pointer,
 364 };
 365
 366 #ifdef CONFIG_HIGH_RES_TIMERS
 367 /*
 368  * hrtimer interface
 369  */
 370
 371 struct dummy_hrtimer_pcm {
 372         /* ops must be the first item */
 373         const struct dummy_timer_ops *timer_ops;
 374         ktime_t base_time;
 375         ktime_t period_time;
 376         atomic_t running;
 377         struct hrtimer timer;
 378         struct snd_pcm_substream *substream;
 379 };
 380
 381 static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer)
 382 {
 383         struct dummy_hrtimer_pcm *dpcm;
 384
 385         dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer);
 386         if (!atomic_read(&dpcm->running))
 387                 return HRTIMER_NORESTART;
 388         /*
 389          * In cases of XRUN and draining, this calls .trigger to stop PCM
 390          * substream.
 391          */
 392         snd_pcm_period_elapsed(dpcm->substream);
 393         if (!atomic_read(&dpcm->running))
 394                 return HRTIMER_NORESTART;
 395
 396         hrtimer_forward_now(timer, dpcm->period_time);
 397         return HRTIMER_RESTART;
 398 }
 399
 400 static int dummy_hrtimer_start(struct snd_pcm_substream *substream)
 401 {
 402         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
 403
 404         dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer);
 405         hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL_SOFT);
 406         atomic_set(&dpcm->running, 1);
 407         return 0;
 408 }
 409
 410 static int dummy_hrtimer_stop(struct snd_pcm_substream *substream)
 411 {
 412         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
 413
 414         atomic_set(&dpcm->running, 0);
 415         if (!hrtimer_callback_running(&dpcm->timer))
 416                 hrtimer_cancel(&dpcm->timer);
 417         return 0;
 418 }
 419
 420 static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
 421 {
 422         hrtimer_cancel(&dpcm->timer);
 423 }
 424
 425 static snd_pcm_uframes_t
 426 dummy_hrtimer_pointer(struct snd_pcm_substream *substream)
 427 {
 428         struct snd_pcm_runtime *runtime = substream->runtime;
 429         struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
 430         u64 delta;
 431         u32 pos;
 432
 433         delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer),
 434                                dpcm->base_time);
 435         delta = div_u64(delta * runtime->rate + 999999, 1000000);
 436         div_u64_rem(delta, runtime->buffer_size, &pos);
 437         return pos;
 438 }
 439
 440 static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream)
 441 {
 442         struct snd_pcm_runtime *runtime = substream->runtime;
 443         struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
 444         unsigned int period, rate;
 445         long sec;
 446         unsigned long nsecs;
 447
 448         dummy_hrtimer_sync(dpcm);
 449         period = runtime->period_size;
 450         rate = runtime->rate;
 451         sec = period / rate;
 452         period %= rate;
 453         nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate);
 454         dpcm->period_time = ktime_set(sec, nsecs);
 455
 456         return 0;
 457 }
 458
 459 static int dummy_hrtimer_create(struct snd_pcm_substream *substream)
 460 {
 461         struct dummy_hrtimer_pcm *dpcm;
 462
 463         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
 464         if (!dpcm)
 465                 return -ENOMEM;
 466         substream->runtime->private_data = dpcm;
 467         hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_SOFT);
 468         dpcm->timer.function = dummy_hrtimer_callback;
 469         dpcm->substream = substream;
 470         atomic_set(&dpcm->running, 0);
 471         return 0;
 472 }
 473
 474 static void dummy_hrtimer_free(struct snd_pcm_substream *substream)
 475 {
 476         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
 477         dummy_hrtimer_sync(dpcm);
 478         kfree(dpcm);
 479 }
 480
 481 static const struct dummy_timer_ops dummy_hrtimer_ops = {
 482         .create =       dummy_hrtimer_create,
 483         .free =         dummy_hrtimer_free,
 484         .prepare =      dummy_hrtimer_prepare,
 485         .start =        dummy_hrtimer_start,
 486         .stop =         dummy_hrtimer_stop,
 487         .pointer =      dummy_hrtimer_pointer,
 488 };
 489
 490 #endif /* CONFIG_HIGH_RES_TIMERS */
 491
 492 /*
 493  * PCM interface
 494  */
 495
 496 static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 497 {
 498         switch (cmd) {
 499         case SNDRV_PCM_TRIGGER_START:
 500         case SNDRV_PCM_TRIGGER_RESUME:
 501                 return get_dummy_ops(substream)->start(substream);
 502         case SNDRV_PCM_TRIGGER_STOP:
 503         case SNDRV_PCM_TRIGGER_SUSPEND:
 504                 return get_dummy_ops(substream)->stop(substream);
 505         }
 506         return -EINVAL;
 507 }
 508
 509 static int dummy_pcm_prepare(struct snd_pcm_substream *substream)
 510 {
 511         return get_dummy_ops(substream)->prepare(substream);
 512 }
 513
 514 static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream)
 515 {
 516         return get_dummy_ops(substream)->pointer(substream);
 517 }
 518
 519 static const struct snd_pcm_hardware dummy_pcm_hardware = {
 520         .info =                 (SNDRV_PCM_INFO_MMAP |
 521                                  SNDRV_PCM_INFO_INTERLEAVED |
 522                                  SNDRV_PCM_INFO_RESUME |
 523                                  SNDRV_PCM_INFO_MMAP_VALID),
 524         .formats =              USE_FORMATS,
 525         .rates =                USE_RATE,
 526         .rate_min =             USE_RATE_MIN,
 527         .rate_max =             USE_RATE_MAX,
 528         .channels_min =         USE_CHANNELS_MIN,
 529         .channels_max =         USE_CHANNELS_MAX,
 530         .buffer_bytes_max =     MAX_BUFFER_SIZE,
 531         .period_bytes_min =     MIN_PERIOD_SIZE,
 532         .period_bytes_max =     MAX_PERIOD_SIZE,
 533         .periods_min =          USE_PERIODS_MIN,
 534         .periods_max =          USE_PERIODS_MAX,
 535         .fifo_size =            0,
 536 };
 537
 538 static int dummy_pcm_hw_params(struct snd_pcm_substream *substream,
 539                                struct snd_pcm_hw_params *hw_params)
 540 {
 541         if (fake_buffer) {
 542                 /* runtime->dma_bytes has to be set manually to allow mmap */
 543                 substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
 544                 return 0;
 545         }
 546         return snd_pcm_lib_malloc_pages(substream,
 547                                         params_buffer_bytes(hw_params));
 548 }
 549
 550 static int dummy_pcm_hw_free(struct snd_pcm_substream *substream)
 551 {
 552         if (fake_buffer)
 553                 return 0;
 554         return snd_pcm_lib_free_pages(substream);
 555 }
 556
 557 static int dummy_pcm_open(struct snd_pcm_substream *substream)
 558 {
 559         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
 560         struct dummy_model *model = dummy->model;
 561         struct snd_pcm_runtime *runtime = substream->runtime;
 562         const struct dummy_timer_ops *ops;
 563         int err;
 564
 565         ops = &dummy_systimer_ops;
 566 #ifdef CONFIG_HIGH_RES_TIMERS
 567         if (hrtimer)
 568                 ops = &dummy_hrtimer_ops;
 569 #endif
 570
 571         err = ops->create(substream);
 572         if (err < 0)
 573                 return err;
 574         get_dummy_ops(substream) = ops;
 575
 576         runtime->hw = dummy->pcm_hw;
 577         if (substream->pcm->device & 1) {
 578                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 579                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 580         }
 581         if (substream->pcm->device & 2)
 582                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
 583                                       SNDRV_PCM_INFO_MMAP_VALID);
 584
 585         if (model == NULL)
 586                 return 0;
 587
 588         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 589                 if (model->playback_constraints)
 590                         err = model->playback_constraints(substream->runtime);
 591         } else {
 592                 if (model->capture_constraints)
 593                         err = model->capture_constraints(substream->runtime);
 594         }
 595         if (err < 0) {
 596                 get_dummy_ops(substream)->free(substream);
 597                 return err;
 598         }
 599         return 0;
 600 }
 601
 602 static int dummy_pcm_close(struct snd_pcm_substream *substream)
 603 {
 604         get_dummy_ops(substream)->free(substream);
 605         return 0;
 606 }
 607
 608 /*
 609  * dummy buffer handling
 610  */
 611
 612 static void *dummy_page[2];
 613
 614 static void free_fake_buffer(void)
 615 {
 616         if (fake_buffer) {
 617                 int i;
 618                 for (i = 0; i < 2; i++)
 619                         if (dummy_page[i]) {
 620                                 free_page((unsigned long)dummy_page[i]);
 621                                 dummy_page[i] = NULL;
 622                         }
 623         }
 624 }
 625
 626 static int alloc_fake_buffer(void)
 627 {
 628         int i;
 629
 630         if (!fake_buffer)
 631                 return 0;
 632         for (i = 0; i < 2; i++) {
 633                 dummy_page[i] = (void *)get_zeroed_page(GFP_KERNEL);
 634                 if (!dummy_page[i]) {
 635                         free_fake_buffer();
 636                         return -ENOMEM;
 637                 }
 638         }
 639         return 0;
 640 }
 641
 642 static int dummy_pcm_copy(struct snd_pcm_substream *substream,
 643                           int channel, unsigned long pos,
 644                           void __user *dst, unsigned long bytes)
 645 {
 646         return 0; /* do nothing */
 647 }
 648
 649 static int dummy_pcm_copy_kernel(struct snd_pcm_substream *substream,
 650                                  int channel, unsigned long pos,
 651                                  void *dst, unsigned long bytes)
 652 {
 653         return 0; /* do nothing */
 654 }
 655
 656 static int dummy_pcm_silence(struct snd_pcm_substream *substream,
 657                              int channel, unsigned long pos,
 658                              unsigned long bytes)
 659 {
 660         return 0; /* do nothing */
 661 }
 662
 663 static struct page *dummy_pcm_page(struct snd_pcm_substream *substream,
 664                                    unsigned long offset)
 665 {
 666         return virt_to_page(dummy_page[substream->stream]); /* the same page */
 667 }
 668
 669 static struct snd_pcm_ops dummy_pcm_ops = {
 670         .open =         dummy_pcm_open,
 671         .close =        dummy_pcm_close,
 672         .ioctl =        snd_pcm_lib_ioctl,
 673         .hw_params =    dummy_pcm_hw_params,
 674         .hw_free =      dummy_pcm_hw_free,
 675         .prepare =      dummy_pcm_prepare,
 676         .trigger =      dummy_pcm_trigger,
 677         .pointer =      dummy_pcm_pointer,
 678 };
 679
 680 static struct snd_pcm_ops dummy_pcm_ops_no_buf = {
 681         .open =         dummy_pcm_open,
 682         .close =        dummy_pcm_close,
 683         .ioctl =        snd_pcm_lib_ioctl,
 684         .hw_params =    dummy_pcm_hw_params,
 685         .hw_free =      dummy_pcm_hw_free,
 686         .prepare =      dummy_pcm_prepare,
 687         .trigger =      dummy_pcm_trigger,
 688         .pointer =      dummy_pcm_pointer,
 689         .copy_user =    dummy_pcm_copy,
 690         .copy_kernel =  dummy_pcm_copy_kernel,
 691         .fill_silence = dummy_pcm_silence,
 692         .page =         dummy_pcm_page,
 693 };
 694
 695 static int snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
 696                               int substreams)
 697 {
 698         struct snd_pcm *pcm;
 699         struct snd_pcm_ops *ops;
 700         int err;
 701
 702         err = snd_pcm_new(dummy->card, "Dummy PCM", device,
 703                                substreams, substreams, &pcm);
 704         if (err < 0)
 705                 return err;
 706         dummy->pcm = pcm;
 707         if (fake_buffer)
 708                 ops = &dummy_pcm_ops_no_buf;
 709         else
 710                 ops = &dummy_pcm_ops;
 711         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, ops);
 712         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, ops);
 713         pcm->private_data = dummy;
 714         pcm->info_flags = 0;
 715         strcpy(pcm->name, "Dummy PCM");
 716         if (!fake_buffer) {
 717                 snd_pcm_lib_preallocate_pages_for_all(pcm,
 718                         SNDRV_DMA_TYPE_CONTINUOUS,
 719                         snd_dma_continuous_data(GFP_KERNEL),
 720                         0, 64*1024);
 721         }
 722         return 0;
 723 }
 724
 725 /*
 726  * mixer interface
 727  */
 728
 729 #define DUMMY_VOLUME(xname, xindex, addr) \
 730 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
 731   .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
 732   .name = xname, .index = xindex, \
 733   .info = snd_dummy_volume_info, \
 734   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
 735   .private_value = addr, \
 736   .tlv = { .p = db_scale_dummy } }
 737
 738 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
 739                                  struct snd_ctl_elem_info *uinfo)
 740 {
 741         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 742         uinfo->count = 2;
 743         uinfo->value.integer.min = -50;
 744         uinfo->value.integer.max = 100;
 745         return 0;
 746 }
 747
 748 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
 749                                 struct snd_ctl_elem_value *ucontrol)
 750 {
 751         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 752         int addr = kcontrol->private_value;
 753
 754         spin_lock_irq(&dummy->mixer_lock);
 755         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
 756         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
 757         spin_unlock_irq(&dummy->mixer_lock);
 758         return 0;
 759 }
 760
 761 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
 762                                 struct snd_ctl_elem_value *ucontrol)
 763 {
 764         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 765         int change, addr = kcontrol->private_value;
 766         int left, right;
 767
 768         left = ucontrol->value.integer.value[0];
 769         if (left < -50)
 770                 left = -50;
 771         if (left > 100)
 772                 left = 100;
 773         right = ucontrol->value.integer.value[1];
 774         if (right < -50)
 775                 right = -50;
 776         if (right > 100)
 777                 right = 100;
 778         spin_lock_irq(&dummy->mixer_lock);
 779         change = dummy->mixer_volume[addr][0] != left ||
 780                  dummy->mixer_volume[addr][1] != right;
 781         dummy->mixer_volume[addr][0] = left;
 782         dummy->mixer_volume[addr][1] = right;
 783         spin_unlock_irq(&dummy->mixer_lock);
 784         return change;
 785 }
 786
 787 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
 788
 789 #define DUMMY_CAPSRC(xname, xindex, addr) \
 790 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 791   .info = snd_dummy_capsrc_info, \
 792   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
 793   .private_value = addr }
 794
 795 #define snd_dummy_capsrc_info   snd_ctl_boolean_stereo_info
 796
 797 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
 798                                 struct snd_ctl_elem_value *ucontrol)
 799 {
 800         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 801         int addr = kcontrol->private_value;
 802
 803         spin_lock_irq(&dummy->mixer_lock);
 804         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
 805         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
 806         spin_unlock_irq(&dummy->mixer_lock);
 807         return 0;
 808 }
 809
 810 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 811 {
 812         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 813         int change, addr = kcontrol->private_value;
 814         int left, right;
 815
 816         left = ucontrol->value.integer.value[0] & 1;
 817         right = ucontrol->value.integer.value[1] & 1;
 818         spin_lock_irq(&dummy->mixer_lock);
 819         change = dummy->capture_source[addr][0] != left &&
 820                  dummy->capture_source[addr][1] != right;
 821         dummy->capture_source[addr][0] = left;
 822         dummy->capture_source[addr][1] = right;
 823         spin_unlock_irq(&dummy->mixer_lock);
 824         return change;
 825 }
 826
 827 static int snd_dummy_iobox_info(struct snd_kcontrol *kcontrol,
 828                                 struct snd_ctl_elem_info *info)
 829 {
 830         static const char *const names[] = { "None", "CD Player" };
 831
 832         return snd_ctl_enum_info(info, 1, 2, names);
 833 }
 834
 835 static int snd_dummy_iobox_get(struct snd_kcontrol *kcontrol,
 836                                struct snd_ctl_elem_value *value)
 837 {
 838         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 839
 840         value->value.enumerated.item[0] = dummy->iobox;
 841         return 0;
 842 }
 843
 844 static int snd_dummy_iobox_put(struct snd_kcontrol *kcontrol,
 845                                struct snd_ctl_elem_value *value)
 846 {
 847         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 848         int changed;
 849
 850         if (value->value.enumerated.item[0] > 1)
 851                 return -EINVAL;
 852
 853         changed = value->value.enumerated.item[0] != dummy->iobox;
 854         if (changed) {
 855                 dummy->iobox = value->value.enumerated.item[0];
 856
 857                 if (dummy->iobox) {
 858                         dummy->cd_volume_ctl->vd[0].access &=
 859                                 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
 860                         dummy->cd_switch_ctl->vd[0].access &=
 861                                 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
 862                 } else {
 863                         dummy->cd_volume_ctl->vd[0].access |=
 864                                 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
 865                         dummy->cd_switch_ctl->vd[0].access |=
 866                                 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
 867                 }
 868
 869                 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
 870                                &dummy->cd_volume_ctl->id);
 871                 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
 872                                &dummy->cd_switch_ctl->id);
 873         }
 874
 875         return changed;
 876 }
 877
 878 static struct snd_kcontrol_new snd_dummy_controls[] = {
 879 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
 880 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
 881 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
 882 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
 883 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
 884 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
 885 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
 886 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
 887 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
 888 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD),
 889 {
 890         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 891         .name  = "External I/O Box",
 892         .info  = snd_dummy_iobox_info,
 893         .get   = snd_dummy_iobox_get,
 894         .put   = snd_dummy_iobox_put,
 895 },
 896 };
 897
 898 static int snd_card_dummy_new_mixer(struct snd_dummy *dummy)
 899 {
 900         struct snd_card *card = dummy->card;
 901         struct snd_kcontrol *kcontrol;
 902         unsigned int idx;
 903         int err;
 904
 905         spin_lock_init(&dummy->mixer_lock);
 906         strcpy(card->mixername, "Dummy Mixer");
 907         dummy->iobox = 1;
 908
 909         for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
 910                 kcontrol = snd_ctl_new1(&snd_dummy_controls[idx], dummy);
 911                 err = snd_ctl_add(card, kcontrol);
 912                 if (err < 0)
 913                         return err;
 914                 if (!strcmp(kcontrol->id.name, "CD Volume"))
 915                         dummy->cd_volume_ctl = kcontrol;
 916                 else if (!strcmp(kcontrol->id.name, "CD Capture Switch"))
 917                         dummy->cd_switch_ctl = kcontrol;
 918
 919         }
 920         return 0;
 921 }
 922
 923 #if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_PROC_FS)
 924 /*
 925  * proc interface
 926  */
 927 static void print_formats(struct snd_dummy *dummy,
 928                           struct snd_info_buffer *buffer)
 929 {
 930         int i;
 931
 932         for (i = 0; i <= SNDRV_PCM_FORMAT_LAST; i++) {
 933                 if (dummy->pcm_hw.formats & (1ULL << i))
 934                         snd_iprintf(buffer, " %s", snd_pcm_format_name(i));
 935         }
 936 }
 937
 938 static void print_rates(struct snd_dummy *dummy,
 939                         struct snd_info_buffer *buffer)
 940 {
 941         static int rates[] = {
 942                 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000,
 943                 64000, 88200, 96000, 176400, 192000,
 944         };
 945         int i;
 946
 947         if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_CONTINUOUS)
 948                 snd_iprintf(buffer, " continuous");
 949         if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_KNOT)
 950                 snd_iprintf(buffer, " knot");
 951         for (i = 0; i < ARRAY_SIZE(rates); i++)
 952                 if (dummy->pcm_hw.rates & (1 << i))
 953                         snd_iprintf(buffer, " %d", rates[i]);
 954 }
 955
 956 #define get_dummy_int_ptr(dummy, ofs) \
 957         (unsigned int *)((char *)&((dummy)->pcm_hw) + (ofs))
 958 #define get_dummy_ll_ptr(dummy, ofs) \
 959         (unsigned long long *)((char *)&((dummy)->pcm_hw) + (ofs))
 960
 961 struct dummy_hw_field {
 962         const char *name;
 963         const char *format;
 964         unsigned int offset;
 965         unsigned int size;
 966 };
 967 #define FIELD_ENTRY(item, fmt) {                   \
 968         .name = #item,                             \
 969         .format = fmt,                             \
 970         .offset = offsetof(struct snd_pcm_hardware, item), \
 971         .size = sizeof(dummy_pcm_hardware.item) }
 972
 973 static struct dummy_hw_field fields[] = {
 974         FIELD_ENTRY(formats, "%#llx"),
 975         FIELD_ENTRY(rates, "%#x"),
 976         FIELD_ENTRY(rate_min, "%d"),
 977         FIELD_ENTRY(rate_max, "%d"),
 978         FIELD_ENTRY(channels_min, "%d"),
 979         FIELD_ENTRY(channels_max, "%d"),
 980         FIELD_ENTRY(buffer_bytes_max, "%ld"),
 981         FIELD_ENTRY(period_bytes_min, "%ld"),
 982         FIELD_ENTRY(period_bytes_max, "%ld"),
 983         FIELD_ENTRY(periods_min, "%d"),
 984         FIELD_ENTRY(periods_max, "%d"),
 985 };
 986
 987 static void dummy_proc_read(struct snd_info_entry *entry,
 988                             struct snd_info_buffer *buffer)
 989 {
 990         struct snd_dummy *dummy = entry->private_data;
 991         int i;
 992
 993         for (i = 0; i < ARRAY_SIZE(fields); i++) {
 994                 snd_iprintf(buffer, "%s ", fields[i].name);
 995                 if (fields[i].size == sizeof(int))
 996                         snd_iprintf(buffer, fields[i].format,
 997                                 *get_dummy_int_ptr(dummy, fields[i].offset));
 998                 else
 999                         snd_iprintf(buffer, fields[i].format,
1000                                 *get_dummy_ll_ptr(dummy, fields[i].offset));
1001                 if (!strcmp(fields[i].name, "formats"))
1002                         print_formats(dummy, buffer);
1003                 else if (!strcmp(fields[i].name, "rates"))
1004                         print_rates(dummy, buffer);
1005                 snd_iprintf(buffer, "\n");
1006         }
1007 }
1008
1009 static void dummy_proc_write(struct snd_info_entry *entry,
1010                              struct snd_info_buffer *buffer)
1011 {
1012         struct snd_dummy *dummy = entry->private_data;
1013         char line[64];
1014
1015         while (!snd_info_get_line(buffer, line, sizeof(line))) {
1016                 char item[20];
1017                 const char *ptr;
1018                 unsigned long long val;
1019                 int i;
1020
1021                 ptr = snd_info_get_str(item, line, sizeof(item));
1022                 for (i = 0; i < ARRAY_SIZE(fields); i++) {
1023                         if (!strcmp(item, fields[i].name))
1024                                 break;
1025                 }
1026                 if (i >= ARRAY_SIZE(fields))
1027                         continue;
1028                 snd_info_get_str(item, ptr, sizeof(item));
1029                 if (kstrtoull(item, 0, &val))
1030                         continue;
1031                 if (fields[i].size == sizeof(int))
1032                         *get_dummy_int_ptr(dummy, fields[i].offset) = val;
1033                 else
1034                         *get_dummy_ll_ptr(dummy, fields[i].offset) = val;
1035         }
1036 }
1037
1038 static void dummy_proc_init(struct snd_dummy *chip)
1039 {
1040         struct snd_info_entry *entry;
1041
1042         if (!snd_card_proc_new(chip->card, "dummy_pcm", &entry)) {
1043                 snd_info_set_text_ops(entry, chip, dummy_proc_read);
1044                 entry->c.text.write = dummy_proc_write;
1045                 entry->mode |= 0200;
1046                 entry->private_data = chip;
1047         }
1048 }
1049 #else
1050 #define dummy_proc_init(x)
1051 #endif /* CONFIG_SND_DEBUG && CONFIG_SND_PROC_FS */
1052
1053 static int snd_dummy_probe(struct platform_device *devptr)
1054 {
1055         struct snd_card *card;
1056         struct snd_dummy *dummy;
1057         struct dummy_model *m = NULL, **mdl;
1058         int idx, err;
1059         int dev = devptr->id;
1060
1061         err = snd_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE,
1062                            sizeof(struct snd_dummy), &card);
1063         if (err < 0)
1064                 return err;
1065         dummy = card->private_data;
1066         dummy->card = card;
1067         for (mdl = dummy_models; *mdl && model[dev]; mdl++) {
1068                 if (strcmp(model[dev], (*mdl)->name) == 0) {
1069                         printk(KERN_INFO
1070                                 "snd-dummy: Using model '%s' for card %i\n",
1071                                 (*mdl)->name, card->number);
1072                         m = dummy->model = *mdl;
1073                         break;
1074                 }
1075         }
1076         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
1077                 if (pcm_substreams[dev] < 1)
1078                         pcm_substreams[dev] = 1;
1079                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
1080                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
1081                 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
1082                 if (err < 0)
1083                         goto __nodev;
1084         }
1085
1086         dummy->pcm_hw = dummy_pcm_hardware;
1087         if (m) {
1088                 if (m->formats)
1089                         dummy->pcm_hw.formats = m->formats;
1090                 if (m->buffer_bytes_max)
1091                         dummy->pcm_hw.buffer_bytes_max = m->buffer_bytes_max;
1092                 if (m->period_bytes_min)
1093                         dummy->pcm_hw.period_bytes_min = m->period_bytes_min;
1094                 if (m->period_bytes_max)
1095                         dummy->pcm_hw.period_bytes_max = m->period_bytes_max;
1096                 if (m->periods_min)
1097                         dummy->pcm_hw.periods_min = m->periods_min;
1098                 if (m->periods_max)
1099                         dummy->pcm_hw.periods_max = m->periods_max;
1100                 if (m->rates)
1101                         dummy->pcm_hw.rates = m->rates;
1102                 if (m->rate_min)
1103                         dummy->pcm_hw.rate_min = m->rate_min;
1104                 if (m->rate_max)
1105                         dummy->pcm_hw.rate_max = m->rate_max;
1106                 if (m->channels_min)
1107                         dummy->pcm_hw.channels_min = m->channels_min;
1108                 if (m->channels_max)
1109                         dummy->pcm_hw.channels_max = m->channels_max;
1110         }
1111
1112         err = snd_card_dummy_new_mixer(dummy);
1113         if (err < 0)
1114                 goto __nodev;
1115         strcpy(card->driver, "Dummy");
1116         strcpy(card->shortname, "Dummy");
1117         sprintf(card->longname, "Dummy %i", dev + 1);
1118
1119         dummy_proc_init(dummy);
1120
1121         err = snd_card_register(card);
1122         if (err == 0) {
1123                 platform_set_drvdata(devptr, card);
1124                 return 0;
1125         }
1126       __nodev:
1127         snd_card_free(card);
1128         return err;
1129 }
1130
1131 static int snd_dummy_remove(struct platform_device *devptr)
1132 {
1133         snd_card_free(platform_get_drvdata(devptr));
1134         return 0;
1135 }
1136
1137 #ifdef CONFIG_PM_SLEEP
1138 static int snd_dummy_suspend(struct device *pdev)
1139 {
1140         struct snd_card *card = dev_get_drvdata(pdev);
1141         struct snd_dummy *dummy = card->private_data;
1142
1143         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1144         snd_pcm_suspend_all(dummy->pcm);
1145         return 0;
1146 }
1147
1148 static int snd_dummy_resume(struct device *pdev)
1149 {
1150         struct snd_card *card = dev_get_drvdata(pdev);
1151
1152         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1153         return 0;
1154 }
1155
1156 static SIMPLE_DEV_PM_OPS(snd_dummy_pm, snd_dummy_suspend, snd_dummy_resume);
1157 #define SND_DUMMY_PM_OPS        &snd_dummy_pm
1158 #else
1159 #define SND_DUMMY_PM_OPS        NULL
1160 #endif
1161
1162 #define SND_DUMMY_DRIVER        "snd_dummy"
1163
1164 static struct platform_driver snd_dummy_driver = {
1165         .probe          = snd_dummy_probe,
1166         .remove         = snd_dummy_remove,
1167         .driver         = {
1168                 .name   = SND_DUMMY_DRIVER,
1169                 .pm     = SND_DUMMY_PM_OPS,
1170         },
1171 };
1172
1173 static void snd_dummy_unregister_all(void)
1174 {
1175         int i;
1176
1177         for (i = 0; i < ARRAY_SIZE(devices); ++i)
1178                 platform_device_unregister(devices[i]);
1179         platform_driver_unregister(&snd_dummy_driver);
1180         free_fake_buffer();
1181 }
1182
1183 static int __init alsa_card_dummy_init(void)
1184 {
1185         int i, cards, err;
1186
1187         err = platform_driver_register(&snd_dummy_driver);
1188         if (err < 0)
1189                 return err;
1190
1191         err = alloc_fake_buffer();
1192         if (err < 0) {
1193                 platform_driver_unregister(&snd_dummy_driver);
1194                 return err;
1195         }
1196
1197         cards = 0;
1198         for (i = 0; i < SNDRV_CARDS; i++) {
1199                 struct platform_device *device;
1200                 if (! enable[i])
1201                         continue;
1202                 device = platform_device_register_simple(SND_DUMMY_DRIVER,
1203                                                          i, NULL, 0);
1204                 if (IS_ERR(device))
1205                         continue;
1206                 if (!platform_get_drvdata(device)) {
1207                         platform_device_unregister(device);
1208                         continue;
1209                 }
1210                 devices[i] = device;
1211                 cards++;
1212         }
1213         if (!cards) {
1214 #ifdef MODULE
1215                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
1216 #endif
1217                 snd_dummy_unregister_all();
1218                 return -ENODEV;
1219         }
1220         return 0;
1221 }
1222
1223 static void __exit alsa_card_dummy_exit(void)
1224 {
1225         snd_dummy_unregister_all();
1226 }
1227
1228 module_init(alsa_card_dummy_init)
1229 module_exit(alsa_card_dummy_exit)