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 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 #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 };
 141
 142 /*
 143  * card models
 144  */
 145
 146 static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime)
 147 {
 148         int err;
 149         err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 150         if (err < 0)
 151                 return err;
 152         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX);
 153         if (err < 0)
 154                 return err;
 155         return 0;
 156 }
 157
 158 struct dummy_model model_emu10k1 = {
 159         .name = "emu10k1",
 160         .playback_constraints = emu10k1_playback_constraints,
 161         .buffer_bytes_max = 128 * 1024,
 162 };
 163
 164 struct dummy_model model_rme9652 = {
 165         .name = "rme9652",
 166         .buffer_bytes_max = 26 * 64 * 1024,
 167         .formats = SNDRV_PCM_FMTBIT_S32_LE,
 168         .channels_min = 26,
 169         .channels_max = 26,
 170         .periods_min = 2,
 171         .periods_max = 2,
 172 };
 173
 174 struct dummy_model model_ice1712 = {
 175         .name = "ice1712",
 176         .buffer_bytes_max = 256 * 1024,
 177         .formats = SNDRV_PCM_FMTBIT_S32_LE,
 178         .channels_min = 10,
 179         .channels_max = 10,
 180         .periods_min = 1,
 181         .periods_max = 1024,
 182 };
 183
 184 struct dummy_model model_uda1341 = {
 185         .name = "uda1341",
 186         .buffer_bytes_max = 16380,
 187         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 188         .channels_min = 2,
 189         .channels_max = 2,
 190         .periods_min = 2,
 191         .periods_max = 255,
 192 };
 193
 194 struct dummy_model model_ac97 = {
 195         .name = "ac97",
 196         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 197         .channels_min = 2,
 198         .channels_max = 2,
 199         .rates = SNDRV_PCM_RATE_48000,
 200         .rate_min = 48000,
 201         .rate_max = 48000,
 202 };
 203
 204 struct dummy_model model_ca0106 = {
 205         .name = "ca0106",
 206         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 207         .buffer_bytes_max = ((65536-64)*8),
 208         .period_bytes_max = (65536-64),
 209         .periods_min = 2,
 210         .periods_max = 8,
 211         .channels_min = 2,
 212         .channels_max = 2,
 213         .rates = SNDRV_PCM_RATE_48000|SNDRV_PCM_RATE_96000|SNDRV_PCM_RATE_192000,
 214         .rate_min = 48000,
 215         .rate_max = 192000,
 216 };
 217
 218 struct dummy_model *dummy_models[] = {
 219         &model_emu10k1,
 220         &model_rme9652,
 221         &model_ice1712,
 222         &model_uda1341,
 223         &model_ac97,
 224         &model_ca0106,
 225         NULL
 226 };
 227
 228 /*
 229  * system timer interface
 230  */
 231
 232 struct dummy_systimer_pcm {
 233         /* ops must be the first item */
 234         const struct dummy_timer_ops *timer_ops;
 235         spinlock_t lock;
 236         struct timer_list timer;
 237         unsigned long base_time;
 238         unsigned int frac_pos;  /* fractional sample position (based HZ) */
 239         unsigned int frac_period_rest;
 240         unsigned int frac_buffer_size;  /* buffer_size * HZ */
 241         unsigned int frac_period_size;  /* period_size * HZ */
 242         unsigned int rate;
 243         int elapsed;
 244         struct snd_pcm_substream *substream;
 245 };
 246
 247 static void dummy_systimer_rearm(struct dummy_systimer_pcm *dpcm)
 248 {
 249         dpcm->timer.expires = jiffies +
 250                 (dpcm->frac_period_rest + dpcm->rate - 1) / dpcm->rate;
 251         add_timer(&dpcm->timer);
 252 }
 253
 254 static void dummy_systimer_update(struct dummy_systimer_pcm *dpcm)
 255 {
 256         unsigned long delta;
 257
 258         delta = jiffies - dpcm->base_time;
 259         if (!delta)
 260                 return;
 261         dpcm->base_time += delta;
 262         delta *= dpcm->rate;
 263         dpcm->frac_pos += delta;
 264         while (dpcm->frac_pos >= dpcm->frac_buffer_size)
 265                 dpcm->frac_pos -= dpcm->frac_buffer_size;
 266         while (dpcm->frac_period_rest <= delta) {
 267                 dpcm->elapsed++;
 268                 dpcm->frac_period_rest += dpcm->frac_period_size;
 269         }
 270         dpcm->frac_period_rest -= delta;
 271 }
 272
 273 static int dummy_systimer_start(struct snd_pcm_substream *substream)
 274 {
 275         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
 276         spin_lock(&dpcm->lock);
 277         dpcm->base_time = jiffies;
 278         dummy_systimer_rearm(dpcm);
 279         spin_unlock(&dpcm->lock);
 280         return 0;
 281 }
 282
 283 static int dummy_systimer_stop(struct snd_pcm_substream *substream)
 284 {
 285         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
 286         spin_lock(&dpcm->lock);
 287         del_timer(&dpcm->timer);
 288         spin_unlock(&dpcm->lock);
 289         return 0;
 290 }
 291
 292 static int dummy_systimer_prepare(struct snd_pcm_substream *substream)
 293 {
 294         struct snd_pcm_runtime *runtime = substream->runtime;
 295         struct dummy_systimer_pcm *dpcm = runtime->private_data;
 296
 297         dpcm->frac_pos = 0;
 298         dpcm->rate = runtime->rate;
 299         dpcm->frac_buffer_size = runtime->buffer_size * HZ;
 300         dpcm->frac_period_size = runtime->period_size * HZ;
 301         dpcm->frac_period_rest = dpcm->frac_period_size;
 302         dpcm->elapsed = 0;
 303
 304         return 0;
 305 }
 306
 307 static void dummy_systimer_callback(unsigned long data)
 308 {
 309         struct dummy_systimer_pcm *dpcm = (struct dummy_systimer_pcm *)data;
 310         unsigned long flags;
 311         int elapsed = 0;
 312
 313         spin_lock_irqsave(&dpcm->lock, flags);
 314         dummy_systimer_update(dpcm);
 315         dummy_systimer_rearm(dpcm);
 316         elapsed = dpcm->elapsed;
 317         dpcm->elapsed = 0;
 318         spin_unlock_irqrestore(&dpcm->lock, flags);
 319         if (elapsed)
 320                 snd_pcm_period_elapsed(dpcm->substream);
 321 }
 322
 323 static snd_pcm_uframes_t
 324 dummy_systimer_pointer(struct snd_pcm_substream *substream)
 325 {
 326         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
 327         snd_pcm_uframes_t pos;
 328
 329         spin_lock(&dpcm->lock);
 330         dummy_systimer_update(dpcm);
 331         pos = dpcm->frac_pos / HZ;
 332         spin_unlock(&dpcm->lock);
 333         return pos;
 334 }
 335
 336 static int dummy_systimer_create(struct snd_pcm_substream *substream)
 337 {
 338         struct dummy_systimer_pcm *dpcm;
 339
 340         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
 341         if (!dpcm)
 342                 return -ENOMEM;
 343         substream->runtime->private_data = dpcm;
 344         init_timer(&dpcm->timer);
 345         dpcm->timer.data = (unsigned long) dpcm;
 346         dpcm->timer.function = dummy_systimer_callback;
 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 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 tasklet_struct tasklet;
 379         struct snd_pcm_substream *substream;
 380 };
 381
 382 static void dummy_hrtimer_pcm_elapsed(unsigned long priv)
 383 {
 384         struct dummy_hrtimer_pcm *dpcm = (struct dummy_hrtimer_pcm *)priv;
 385         if (atomic_read(&dpcm->running))
 386                 snd_pcm_period_elapsed(dpcm->substream);
 387 }
 388
 389 static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer)
 390 {
 391         struct dummy_hrtimer_pcm *dpcm;
 392
 393         dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer);
 394         if (!atomic_read(&dpcm->running))
 395                 return HRTIMER_NORESTART;
 396         tasklet_schedule(&dpcm->tasklet);
 397         hrtimer_forward_now(timer, dpcm->period_time);
 398         return HRTIMER_RESTART;
 399 }
 400
 401 static int dummy_hrtimer_start(struct snd_pcm_substream *substream)
 402 {
 403         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
 404
 405         dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer);
 406         hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL);
 407         atomic_set(&dpcm->running, 1);
 408         return 0;
 409 }
 410
 411 static int dummy_hrtimer_stop(struct snd_pcm_substream *substream)
 412 {
 413         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
 414
 415         atomic_set(&dpcm->running, 0);
 416         hrtimer_cancel(&dpcm->timer);
 417         return 0;
 418 }
 419
 420 static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
 421 {
 422         tasklet_kill(&dpcm->tasklet);
 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);
 468         dpcm->timer.function = dummy_hrtimer_callback;
 469         dpcm->substream = substream;
 470         atomic_set(&dpcm->running, 0);
 471         tasklet_init(&dpcm->tasklet, dummy_hrtimer_pcm_elapsed,
 472                      (unsigned long)dpcm);
 473         return 0;
 474 }
 475
 476 static void dummy_hrtimer_free(struct snd_pcm_substream *substream)
 477 {
 478         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
 479         dummy_hrtimer_sync(dpcm);
 480         kfree(dpcm);
 481 }
 482
 483 static struct dummy_timer_ops dummy_hrtimer_ops = {
 484         .create =       dummy_hrtimer_create,
 485         .free =         dummy_hrtimer_free,
 486         .prepare =      dummy_hrtimer_prepare,
 487         .start =        dummy_hrtimer_start,
 488         .stop =         dummy_hrtimer_stop,
 489         .pointer =      dummy_hrtimer_pointer,
 490 };
 491
 492 #endif /* CONFIG_HIGH_RES_TIMERS */
 493
 494 /*
 495  * PCM interface
 496  */
 497
 498 static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 499 {
 500         switch (cmd) {
 501         case SNDRV_PCM_TRIGGER_START:
 502         case SNDRV_PCM_TRIGGER_RESUME:
 503                 return get_dummy_ops(substream)->start(substream);
 504         case SNDRV_PCM_TRIGGER_STOP:
 505         case SNDRV_PCM_TRIGGER_SUSPEND:
 506                 return get_dummy_ops(substream)->stop(substream);
 507         }
 508         return -EINVAL;
 509 }
 510
 511 static int dummy_pcm_prepare(struct snd_pcm_substream *substream)
 512 {
 513         return get_dummy_ops(substream)->prepare(substream);
 514 }
 515
 516 static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream)
 517 {
 518         return get_dummy_ops(substream)->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         const struct dummy_timer_ops *ops;
 565         int err;
 566
 567         ops = &dummy_systimer_ops;
 568 #ifdef CONFIG_HIGH_RES_TIMERS
 569         if (hrtimer)
 570                 ops = &dummy_hrtimer_ops;
 571 #endif
 572
 573         err = ops->create(substream);
 574         if (err < 0)
 575                 return err;
 576         get_dummy_ops(substream) = ops;
 577
 578         runtime->hw = dummy->pcm_hw;
 579         if (substream->pcm->device & 1) {
 580                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 581                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 582         }
 583         if (substream->pcm->device & 2)
 584                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
 585                                       SNDRV_PCM_INFO_MMAP_VALID);
 586
 587         if (model == NULL)
 588                 return 0;
 589
 590         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 591                 if (model->playback_constraints)
 592                         err = model->playback_constraints(substream->runtime);
 593         } else {
 594                 if (model->capture_constraints)
 595                         err = model->capture_constraints(substream->runtime);
 596         }
 597         if (err < 0) {
 598                 get_dummy_ops(substream)->free(substream);
 599                 return err;
 600         }
 601         return 0;
 602 }
 603
 604 static int dummy_pcm_close(struct snd_pcm_substream *substream)
 605 {
 606         get_dummy_ops(substream)->free(substream);
 607         return 0;
 608 }
 609
 610 /*
 611  * dummy buffer handling
 612  */
 613
 614 static void *dummy_page[2];
 615
 616 static void free_fake_buffer(void)
 617 {
 618         if (fake_buffer) {
 619                 int i;
 620                 for (i = 0; i < 2; i++)
 621                         if (dummy_page[i]) {
 622                                 free_page((unsigned long)dummy_page[i]);
 623                                 dummy_page[i] = NULL;
 624                         }
 625         }
 626 }
 627
 628 static int alloc_fake_buffer(void)
 629 {
 630         int i;
 631
 632         if (!fake_buffer)
 633                 return 0;
 634         for (i = 0; i < 2; i++) {
 635                 dummy_page[i] = (void *)get_zeroed_page(GFP_KERNEL);
 636                 if (!dummy_page[i]) {
 637                         free_fake_buffer();
 638                         return -ENOMEM;
 639                 }
 640         }
 641         return 0;
 642 }
 643
 644 static int dummy_pcm_copy(struct snd_pcm_substream *substream,
 645                           int channel, snd_pcm_uframes_t pos,
 646                           void __user *dst, snd_pcm_uframes_t count)
 647 {
 648         return 0; /* do nothing */
 649 }
 650
 651 static int dummy_pcm_silence(struct snd_pcm_substream *substream,
 652                              int channel, snd_pcm_uframes_t pos,
 653                              snd_pcm_uframes_t count)
 654 {
 655         return 0; /* do nothing */
 656 }
 657
 658 static struct page *dummy_pcm_page(struct snd_pcm_substream *substream,
 659                                    unsigned long offset)
 660 {
 661         return virt_to_page(dummy_page[substream->stream]); /* the same page */
 662 }
 663
 664 static struct snd_pcm_ops dummy_pcm_ops = {
 665         .open =         dummy_pcm_open,
 666         .close =        dummy_pcm_close,
 667         .ioctl =        snd_pcm_lib_ioctl,
 668         .hw_params =    dummy_pcm_hw_params,
 669         .hw_free =      dummy_pcm_hw_free,
 670         .prepare =      dummy_pcm_prepare,
 671         .trigger =      dummy_pcm_trigger,
 672         .pointer =      dummy_pcm_pointer,
 673 };
 674
 675 static struct snd_pcm_ops dummy_pcm_ops_no_buf = {
 676         .open =         dummy_pcm_open,
 677         .close =        dummy_pcm_close,
 678         .ioctl =        snd_pcm_lib_ioctl,
 679         .hw_params =    dummy_pcm_hw_params,
 680         .hw_free =      dummy_pcm_hw_free,
 681         .prepare =      dummy_pcm_prepare,
 682         .trigger =      dummy_pcm_trigger,
 683         .pointer =      dummy_pcm_pointer,
 684         .copy =         dummy_pcm_copy,
 685         .silence =      dummy_pcm_silence,
 686         .page =         dummy_pcm_page,
 687 };
 688
 689 static int __devinit snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
 690                                         int substreams)
 691 {
 692         struct snd_pcm *pcm;
 693         struct snd_pcm_ops *ops;
 694         int err;
 695
 696         err = snd_pcm_new(dummy->card, "Dummy PCM", device,
 697                                substreams, substreams, &pcm);
 698         if (err < 0)
 699                 return err;
 700         dummy->pcm = pcm;
 701         if (fake_buffer)
 702                 ops = &dummy_pcm_ops_no_buf;
 703         else
 704                 ops = &dummy_pcm_ops;
 705         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, ops);
 706         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, ops);
 707         pcm->private_data = dummy;
 708         pcm->info_flags = 0;
 709         strcpy(pcm->name, "Dummy PCM");
 710         if (!fake_buffer) {
 711                 snd_pcm_lib_preallocate_pages_for_all(pcm,
 712                         SNDRV_DMA_TYPE_CONTINUOUS,
 713                         snd_dma_continuous_data(GFP_KERNEL),
 714                         0, 64*1024);
 715         }
 716         return 0;
 717 }
 718
 719 /*
 720  * mixer interface
 721  */
 722
 723 #define DUMMY_VOLUME(xname, xindex, addr) \
 724 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
 725   .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
 726   .name = xname, .index = xindex, \
 727   .info = snd_dummy_volume_info, \
 728   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
 729   .private_value = addr, \
 730   .tlv = { .p = db_scale_dummy } }
 731
 732 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
 733                                  struct snd_ctl_elem_info *uinfo)
 734 {
 735         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 736         uinfo->count = 2;
 737         uinfo->value.integer.min = -50;
 738         uinfo->value.integer.max = 100;
 739         return 0;
 740 }
 741
 742 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
 743                                 struct snd_ctl_elem_value *ucontrol)
 744 {
 745         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 746         int addr = kcontrol->private_value;
 747
 748         spin_lock_irq(&dummy->mixer_lock);
 749         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
 750         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
 751         spin_unlock_irq(&dummy->mixer_lock);
 752         return 0;
 753 }
 754
 755 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
 756                                 struct snd_ctl_elem_value *ucontrol)
 757 {
 758         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 759         int change, addr = kcontrol->private_value;
 760         int left, right;
 761
 762         left = ucontrol->value.integer.value[0];
 763         if (left < -50)
 764                 left = -50;
 765         if (left > 100)
 766                 left = 100;
 767         right = ucontrol->value.integer.value[1];
 768         if (right < -50)
 769                 right = -50;
 770         if (right > 100)
 771                 right = 100;
 772         spin_lock_irq(&dummy->mixer_lock);
 773         change = dummy->mixer_volume[addr][0] != left ||
 774                  dummy->mixer_volume[addr][1] != right;
 775         dummy->mixer_volume[addr][0] = left;
 776         dummy->mixer_volume[addr][1] = right;
 777         spin_unlock_irq(&dummy->mixer_lock);
 778         return change;
 779 }
 780
 781 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
 782
 783 #define DUMMY_CAPSRC(xname, xindex, addr) \
 784 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 785   .info = snd_dummy_capsrc_info, \
 786   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
 787   .private_value = addr }
 788
 789 #define snd_dummy_capsrc_info   snd_ctl_boolean_stereo_info
 790
 791 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
 792                                 struct snd_ctl_elem_value *ucontrol)
 793 {
 794         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 795         int addr = kcontrol->private_value;
 796
 797         spin_lock_irq(&dummy->mixer_lock);
 798         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
 799         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
 800         spin_unlock_irq(&dummy->mixer_lock);
 801         return 0;
 802 }
 803
 804 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 805 {
 806         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 807         int change, addr = kcontrol->private_value;
 808         int left, right;
 809
 810         left = ucontrol->value.integer.value[0] & 1;
 811         right = ucontrol->value.integer.value[1] & 1;
 812         spin_lock_irq(&dummy->mixer_lock);
 813         change = dummy->capture_source[addr][0] != left &&
 814                  dummy->capture_source[addr][1] != right;
 815         dummy->capture_source[addr][0] = left;
 816         dummy->capture_source[addr][1] = right;
 817         spin_unlock_irq(&dummy->mixer_lock);
 818         return change;
 819 }
 820
 821 static struct snd_kcontrol_new snd_dummy_controls[] = {
 822 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
 823 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
 824 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
 825 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
 826 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
 827 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
 828 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
 829 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
 830 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
 831 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD)
 832 };
 833
 834 static int __devinit snd_card_dummy_new_mixer(struct snd_dummy *dummy)
 835 {
 836         struct snd_card *card = dummy->card;
 837         unsigned int idx;
 838         int err;
 839
 840         spin_lock_init(&dummy->mixer_lock);
 841         strcpy(card->mixername, "Dummy Mixer");
 842
 843         for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
 844                 err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy));
 845                 if (err < 0)
 846                         return err;
 847         }
 848         return 0;
 849 }
 850
 851 #if defined(CONFIG_SND_DEBUG) && defined(CONFIG_PROC_FS)
 852 /*
 853  * proc interface
 854  */
 855 static void print_formats(struct snd_dummy *dummy,
 856                           struct snd_info_buffer *buffer)
 857 {
 858         int i;
 859
 860         for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) {
 861                 if (dummy->pcm_hw.formats & (1ULL << i))
 862                         snd_iprintf(buffer, " %s", snd_pcm_format_name(i));
 863         }
 864 }
 865
 866 static void print_rates(struct snd_dummy *dummy,
 867                         struct snd_info_buffer *buffer)
 868 {
 869         static int rates[] = {
 870                 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000,
 871                 64000, 88200, 96000, 176400, 192000,
 872         };
 873         int i;
 874
 875         if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_CONTINUOUS)
 876                 snd_iprintf(buffer, " continuous");
 877         if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_KNOT)
 878                 snd_iprintf(buffer, " knot");
 879         for (i = 0; i < ARRAY_SIZE(rates); i++)
 880                 if (dummy->pcm_hw.rates & (1 << i))
 881                         snd_iprintf(buffer, " %d", rates[i]);
 882 }
 883
 884 #define get_dummy_int_ptr(dummy, ofs) \
 885         (unsigned int *)((char *)&((dummy)->pcm_hw) + (ofs))
 886 #define get_dummy_ll_ptr(dummy, ofs) \
 887         (unsigned long long *)((char *)&((dummy)->pcm_hw) + (ofs))
 888
 889 struct dummy_hw_field {
 890         const char *name;
 891         const char *format;
 892         unsigned int offset;
 893         unsigned int size;
 894 };
 895 #define FIELD_ENTRY(item, fmt) {                   \
 896         .name = #item,                             \
 897         .format = fmt,                             \
 898         .offset = offsetof(struct snd_pcm_hardware, item), \
 899         .size = sizeof(dummy_pcm_hardware.item) }
 900
 901 static struct dummy_hw_field fields[] = {
 902         FIELD_ENTRY(formats, "%#llx"),
 903         FIELD_ENTRY(rates, "%#x"),
 904         FIELD_ENTRY(rate_min, "%d"),
 905         FIELD_ENTRY(rate_max, "%d"),
 906         FIELD_ENTRY(channels_min, "%d"),
 907         FIELD_ENTRY(channels_max, "%d"),
 908         FIELD_ENTRY(buffer_bytes_max, "%ld"),
 909         FIELD_ENTRY(period_bytes_min, "%ld"),
 910         FIELD_ENTRY(period_bytes_max, "%ld"),
 911         FIELD_ENTRY(periods_min, "%d"),
 912         FIELD_ENTRY(periods_max, "%d"),
 913 };
 914
 915 static void dummy_proc_read(struct snd_info_entry *entry,
 916                             struct snd_info_buffer *buffer)
 917 {
 918         struct snd_dummy *dummy = entry->private_data;
 919         int i;
 920
 921         for (i = 0; i < ARRAY_SIZE(fields); i++) {
 922                 snd_iprintf(buffer, "%s ", fields[i].name);
 923                 if (fields[i].size == sizeof(int))
 924                         snd_iprintf(buffer, fields[i].format,
 925                                 *get_dummy_int_ptr(dummy, fields[i].offset));
 926                 else
 927                         snd_iprintf(buffer, fields[i].format,
 928                                 *get_dummy_ll_ptr(dummy, fields[i].offset));
 929                 if (!strcmp(fields[i].name, "formats"))
 930                         print_formats(dummy, buffer);
 931                 else if (!strcmp(fields[i].name, "rates"))
 932                         print_rates(dummy, buffer);
 933                 snd_iprintf(buffer, "\n");
 934         }
 935 }
 936
 937 static void dummy_proc_write(struct snd_info_entry *entry,
 938                              struct snd_info_buffer *buffer)
 939 {
 940         struct snd_dummy *dummy = entry->private_data;
 941         char line[64];
 942
 943         while (!snd_info_get_line(buffer, line, sizeof(line))) {
 944                 char item[20];
 945                 const char *ptr;
 946                 unsigned long long val;
 947                 int i;
 948
 949                 ptr = snd_info_get_str(item, line, sizeof(item));
 950                 for (i = 0; i < ARRAY_SIZE(fields); i++) {
 951                         if (!strcmp(item, fields[i].name))
 952                                 break;
 953                 }
 954                 if (i >= ARRAY_SIZE(fields))
 955                         continue;
 956                 snd_info_get_str(item, ptr, sizeof(item));
 957                 if (strict_strtoull(item, 0, &val))
 958                         continue;
 959                 if (fields[i].size == sizeof(int))
 960                         *get_dummy_int_ptr(dummy, fields[i].offset) = val;
 961                 else
 962                         *get_dummy_ll_ptr(dummy, fields[i].offset) = val;
 963         }
 964 }
 965
 966 static void __devinit dummy_proc_init(struct snd_dummy *chip)
 967 {
 968         struct snd_info_entry *entry;
 969
 970         if (!snd_card_proc_new(chip->card, "dummy_pcm", &entry)) {
 971                 snd_info_set_text_ops(entry, chip, dummy_proc_read);
 972                 entry->c.text.write = dummy_proc_write;
 973                 entry->mode |= S_IWUSR;
 974                 entry->private_data = chip;
 975         }
 976 }
 977 #else
 978 #define dummy_proc_init(x)
 979 #endif /* CONFIG_SND_DEBUG && CONFIG_PROC_FS */
 980
 981 static int __devinit snd_dummy_probe(struct platform_device *devptr)
 982 {
 983         struct snd_card *card;
 984         struct snd_dummy *dummy;
 985         struct dummy_model *m = NULL, **mdl;
 986         int idx, err;
 987         int dev = devptr->id;
 988
 989         err = snd_card_create(index[dev], id[dev], THIS_MODULE,
 990                               sizeof(struct snd_dummy), &card);
 991         if (err < 0)
 992                 return err;
 993         dummy = card->private_data;
 994         dummy->card = card;
 995         for (mdl = dummy_models; *mdl && model[dev]; mdl++) {
 996                 if (strcmp(model[dev], (*mdl)->name) == 0) {
 997                         printk(KERN_INFO
 998                                 "snd-dummy: Using model '%s' for card %i\n",
 999                                 (*mdl)->name, card->number);
1000                         m = dummy->model = *mdl;
1001                         break;
1002                 }
1003         }
1004         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
1005                 if (pcm_substreams[dev] < 1)
1006                         pcm_substreams[dev] = 1;
1007                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
1008                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
1009                 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
1010                 if (err < 0)
1011                         goto __nodev;
1012         }
1013
1014         dummy->pcm_hw = dummy_pcm_hardware;
1015         if (m) {
1016                 if (m->formats)
1017                         dummy->pcm_hw.formats = m->formats;
1018                 if (m->buffer_bytes_max)
1019                         dummy->pcm_hw.buffer_bytes_max = m->buffer_bytes_max;
1020                 if (m->period_bytes_min)
1021                         dummy->pcm_hw.period_bytes_min = m->period_bytes_min;
1022                 if (m->period_bytes_max)
1023                         dummy->pcm_hw.period_bytes_max = m->period_bytes_max;
1024                 if (m->periods_min)
1025                         dummy->pcm_hw.periods_min = m->periods_min;
1026                 if (m->periods_max)
1027                         dummy->pcm_hw.periods_max = m->periods_max;
1028                 if (m->rates)
1029                         dummy->pcm_hw.rates = m->rates;
1030                 if (m->rate_min)
1031                         dummy->pcm_hw.rate_min = m->rate_min;
1032                 if (m->rate_max)
1033                         dummy->pcm_hw.rate_max = m->rate_max;
1034                 if (m->channels_min)
1035                         dummy->pcm_hw.channels_min = m->channels_min;
1036                 if (m->channels_max)
1037                         dummy->pcm_hw.channels_max = m->channels_max;
1038         }
1039
1040         err = snd_card_dummy_new_mixer(dummy);
1041         if (err < 0)
1042                 goto __nodev;
1043         strcpy(card->driver, "Dummy");
1044         strcpy(card->shortname, "Dummy");
1045         sprintf(card->longname, "Dummy %i", dev + 1);
1046
1047         dummy_proc_init(dummy);
1048
1049         snd_card_set_dev(card, &devptr->dev);
1050
1051         err = snd_card_register(card);
1052         if (err == 0) {
1053                 platform_set_drvdata(devptr, card);
1054                 return 0;
1055         }
1056       __nodev:
1057         snd_card_free(card);
1058         return err;
1059 }
1060
1061 static int __devexit snd_dummy_remove(struct platform_device *devptr)
1062 {
1063         snd_card_free(platform_get_drvdata(devptr));
1064         platform_set_drvdata(devptr, NULL);
1065         return 0;
1066 }
1067
1068 #ifdef CONFIG_PM
1069 static int snd_dummy_suspend(struct platform_device *pdev, pm_message_t state)
1070 {
1071         struct snd_card *card = platform_get_drvdata(pdev);
1072         struct snd_dummy *dummy = card->private_data;
1073
1074         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1075         snd_pcm_suspend_all(dummy->pcm);
1076         return 0;
1077 }
1078
1079 static int snd_dummy_resume(struct platform_device *pdev)
1080 {
1081         struct snd_card *card = platform_get_drvdata(pdev);
1082
1083         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1084         return 0;
1085 }
1086 #endif
1087
1088 #define SND_DUMMY_DRIVER        "snd_dummy"
1089
1090 static struct platform_driver snd_dummy_driver = {
1091         .probe          = snd_dummy_probe,
1092         .remove         = __devexit_p(snd_dummy_remove),
1093 #ifdef CONFIG_PM
1094         .suspend        = snd_dummy_suspend,
1095         .resume         = snd_dummy_resume,
1096 #endif
1097         .driver         = {
1098                 .name   = SND_DUMMY_DRIVER
1099         },
1100 };
1101
1102 static void snd_dummy_unregister_all(void)
1103 {
1104         int i;
1105
1106         for (i = 0; i < ARRAY_SIZE(devices); ++i)
1107                 platform_device_unregister(devices[i]);
1108         platform_driver_unregister(&snd_dummy_driver);
1109         free_fake_buffer();
1110 }
1111
1112 static int __init alsa_card_dummy_init(void)
1113 {
1114         int i, cards, err;
1115
1116         err = platform_driver_register(&snd_dummy_driver);
1117         if (err < 0)
1118                 return err;
1119
1120         err = alloc_fake_buffer();
1121         if (err < 0) {
1122                 platform_driver_unregister(&snd_dummy_driver);
1123                 return err;
1124         }
1125
1126         cards = 0;
1127         for (i = 0; i < SNDRV_CARDS; i++) {
1128                 struct platform_device *device;
1129                 if (! enable[i])
1130                         continue;
1131                 device = platform_device_register_simple(SND_DUMMY_DRIVER,
1132                                                          i, NULL, 0);
1133                 if (IS_ERR(device))
1134                         continue;
1135                 if (!platform_get_drvdata(device)) {
1136                         platform_device_unregister(device);
1137                         continue;
1138                 }
1139                 devices[i] = device;
1140                 cards++;
1141         }
1142         if (!cards) {
1143 #ifdef MODULE
1144                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
1145 #endif
1146                 snd_dummy_unregister_all();
1147                 return -ENODEV;
1148         }
1149         return 0;
1150 }
1151
1152 static void __exit alsa_card_dummy_exit(void)
1153 {
1154         snd_dummy_unregister_all();
1155 }
1156
1157 module_init(alsa_card_dummy_init)
1158 module_exit(alsa_card_dummy_exit)