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