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/initval.h>
  37
  38 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  39 MODULE_DESCRIPTION("Dummy soundcard (/dev/null)");
  40 MODULE_LICENSE("GPL");
  41 MODULE_SUPPORTED_DEVICE("{{ALSA,Dummy soundcard}}");
  42
  43 #define MAX_PCM_DEVICES         4
  44 #define MAX_PCM_SUBSTREAMS      16
  45 #define MAX_MIDI_DEVICES        2
  46
  47 #if 0 /* emu10k1 emulation */
  48 #define MAX_BUFFER_SIZE         (128 * 1024)
  49 static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime)
  50 {
  51         int err;
  52         err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
  53         if (err < 0)
  54                 return err;
  55         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX);
  56         if (err < 0)
  57                 return err;
  58         return 0;
  59 }
  60 #define add_playback_constraints emu10k1_playback_constraints
  61 #endif
  62
  63 #if 0 /* RME9652 emulation */
  64 #define MAX_BUFFER_SIZE         (26 * 64 * 1024)
  65 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
  66 #define USE_CHANNELS_MIN        26
  67 #define USE_CHANNELS_MAX        26
  68 #define USE_PERIODS_MIN         2
  69 #define USE_PERIODS_MAX         2
  70 #endif
  71
  72 #if 0 /* ICE1712 emulation */
  73 #define MAX_BUFFER_SIZE         (256 * 1024)
  74 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
  75 #define USE_CHANNELS_MIN        10
  76 #define USE_CHANNELS_MAX        10
  77 #define USE_PERIODS_MIN         1
  78 #define USE_PERIODS_MAX         1024
  79 #endif
  80
  81 #if 0 /* UDA1341 emulation */
  82 #define MAX_BUFFER_SIZE         (16380)
  83 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
  84 #define USE_CHANNELS_MIN        2
  85 #define USE_CHANNELS_MAX        2
  86 #define USE_PERIODS_MIN         2
  87 #define USE_PERIODS_MAX         255
  88 #endif
  89
  90 #if 0 /* simple AC97 bridge (intel8x0) with 48kHz AC97 only codec */
  91 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
  92 #define USE_CHANNELS_MIN        2
  93 #define USE_CHANNELS_MAX        2
  94 #define USE_RATE                SNDRV_PCM_RATE_48000
  95 #define USE_RATE_MIN            48000
  96 #define USE_RATE_MAX            48000
  97 #endif
  98
  99 #if 0 /* CA0106 */
 100 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
 101 #define USE_CHANNELS_MIN        2
 102 #define USE_CHANNELS_MAX        2
 103 #define USE_RATE                (SNDRV_PCM_RATE_48000|SNDRV_PCM_RATE_96000|SNDRV_PCM_RATE_192000)
 104 #define USE_RATE_MIN            48000
 105 #define USE_RATE_MAX            192000
 106 #define MAX_BUFFER_SIZE         ((65536-64)*8)
 107 #define MAX_PERIOD_SIZE         (65536-64)
 108 #define USE_PERIODS_MIN         2
 109 #define USE_PERIODS_MAX         8
 110 #endif
 111
 112
 113 /* defaults */
 114 #ifndef MAX_BUFFER_SIZE
 115 #define MAX_BUFFER_SIZE         (64*1024)
 116 #endif
 117 #ifndef MAX_PERIOD_SIZE
 118 #define MAX_PERIOD_SIZE         MAX_BUFFER_SIZE
 119 #endif
 120 #ifndef USE_FORMATS
 121 #define USE_FORMATS             (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)
 122 #endif
 123 #ifndef USE_RATE
 124 #define USE_RATE                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000
 125 #define USE_RATE_MIN            5500
 126 #define USE_RATE_MAX            48000
 127 #endif
 128 #ifndef USE_CHANNELS_MIN
 129 #define USE_CHANNELS_MIN        1
 130 #endif
 131 #ifndef USE_CHANNELS_MAX
 132 #define USE_CHANNELS_MAX        2
 133 #endif
 134 #ifndef USE_PERIODS_MIN
 135 #define USE_PERIODS_MIN         1
 136 #endif
 137 #ifndef USE_PERIODS_MAX
 138 #define USE_PERIODS_MAX         1024
 139 #endif
 140 #ifndef add_playback_constraints
 141 #define add_playback_constraints(x) 0
 142 #endif
 143 #ifndef add_capture_constraints
 144 #define add_capture_constraints(x) 0
 145 #endif
 146
 147 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
 148 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
 149 static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
 150 static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
 151 static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
 152 //static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
 153 #ifdef CONFIG_HIGH_RES_TIMERS
 154 static int hrtimer = 1;
 155 #endif
 156
 157 module_param_array(index, int, NULL, 0444);
 158 MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
 159 module_param_array(id, charp, NULL, 0444);
 160 MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
 161 module_param_array(enable, bool, NULL, 0444);
 162 MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
 163 module_param_array(pcm_devs, int, NULL, 0444);
 164 MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
 165 module_param_array(pcm_substreams, int, NULL, 0444);
 166 MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-16) for dummy driver.");
 167 //module_param_array(midi_devs, int, NULL, 0444);
 168 //MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
 169 #ifdef CONFIG_HIGH_RES_TIMERS
 170 module_param(hrtimer, bool, 0644);
 171 MODULE_PARM_DESC(hrtimer, "Use hrtimer as the timer source.");
 172 #endif
 173
 174 static struct platform_device *devices[SNDRV_CARDS];
 175
 176 #define MIXER_ADDR_MASTER       0
 177 #define MIXER_ADDR_LINE         1
 178 #define MIXER_ADDR_MIC          2
 179 #define MIXER_ADDR_SYNTH        3
 180 #define MIXER_ADDR_CD           4
 181 #define MIXER_ADDR_LAST         4
 182
 183 struct dummy_timer_ops {
 184         int (*create)(struct snd_pcm_substream *);
 185         void (*free)(struct snd_pcm_substream *);
 186         int (*prepare)(struct snd_pcm_substream *);
 187         int (*start)(struct snd_pcm_substream *);
 188         int (*stop)(struct snd_pcm_substream *);
 189         snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *);
 190 };
 191
 192 struct snd_dummy {
 193         struct snd_card *card;
 194         struct snd_pcm *pcm;
 195         spinlock_t mixer_lock;
 196         int mixer_volume[MIXER_ADDR_LAST+1][2];
 197         int capture_source[MIXER_ADDR_LAST+1][2];
 198         const struct dummy_timer_ops *timer_ops;
 199 };
 200
 201 /*
 202  * system timer interface
 203  */
 204
 205 struct dummy_systimer_pcm {
 206         spinlock_t lock;
 207         struct timer_list timer;
 208         unsigned long base_time;
 209         unsigned int frac_pos;  /* fractional sample position (based HZ) */
 210         unsigned int frac_period_rest;
 211         unsigned int frac_buffer_size;  /* buffer_size * HZ */
 212         unsigned int frac_period_size;  /* period_size * HZ */
 213         unsigned int rate;
 214         int elapsed;
 215         struct snd_pcm_substream *substream;
 216 };
 217
 218 static void dummy_systimer_rearm(struct dummy_systimer_pcm *dpcm)
 219 {
 220         dpcm->timer.expires = jiffies +
 221                 (dpcm->frac_period_rest + dpcm->rate - 1) / dpcm->rate;
 222         add_timer(&dpcm->timer);
 223 }
 224
 225 static void dummy_systimer_update(struct dummy_systimer_pcm *dpcm)
 226 {
 227         unsigned long delta;
 228
 229         delta = jiffies - dpcm->base_time;
 230         if (!delta)
 231                 return;
 232         dpcm->base_time += delta;
 233         delta *= dpcm->rate;
 234         dpcm->frac_pos += delta;
 235         while (dpcm->frac_pos >= dpcm->frac_buffer_size)
 236                 dpcm->frac_pos -= dpcm->frac_buffer_size;
 237         while (dpcm->frac_period_rest <= delta) {
 238                 dpcm->elapsed++;
 239                 dpcm->frac_period_rest += dpcm->frac_period_size;
 240         }
 241         dpcm->frac_period_rest -= delta;
 242 }
 243
 244 static int dummy_systimer_start(struct snd_pcm_substream *substream)
 245 {
 246         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
 247         spin_lock(&dpcm->lock);
 248         dpcm->base_time = jiffies;
 249         dummy_systimer_rearm(dpcm);
 250         spin_unlock(&dpcm->lock);
 251         return 0;
 252 }
 253
 254 static int dummy_systimer_stop(struct snd_pcm_substream *substream)
 255 {
 256         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
 257         spin_lock(&dpcm->lock);
 258         del_timer(&dpcm->timer);
 259         spin_unlock(&dpcm->lock);
 260         return 0;
 261 }
 262
 263 static int dummy_systimer_prepare(struct snd_pcm_substream *substream)
 264 {
 265         struct snd_pcm_runtime *runtime = substream->runtime;
 266         struct dummy_systimer_pcm *dpcm = runtime->private_data;
 267
 268         dpcm->frac_pos = 0;
 269         dpcm->rate = runtime->rate;
 270         dpcm->frac_buffer_size = runtime->buffer_size * HZ;
 271         dpcm->frac_period_size = runtime->period_size * HZ;
 272         dpcm->frac_period_rest = dpcm->frac_period_size;
 273         dpcm->elapsed = 0;
 274
 275         return 0;
 276 }
 277
 278 static void dummy_systimer_callback(unsigned long data)
 279 {
 280         struct dummy_systimer_pcm *dpcm = (struct dummy_systimer_pcm *)data;
 281         unsigned long flags;
 282         int elapsed = 0;
 283
 284         spin_lock_irqsave(&dpcm->lock, flags);
 285         dummy_systimer_update(dpcm);
 286         dummy_systimer_rearm(dpcm);
 287         elapsed = dpcm->elapsed;
 288         dpcm->elapsed = 0;
 289         spin_unlock_irqrestore(&dpcm->lock, flags);
 290         if (elapsed)
 291                 snd_pcm_period_elapsed(dpcm->substream);
 292 }
 293
 294 static snd_pcm_uframes_t
 295 dummy_systimer_pointer(struct snd_pcm_substream *substream)
 296 {
 297         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
 298         snd_pcm_uframes_t pos;
 299
 300         spin_lock(&dpcm->lock);
 301         dummy_systimer_update(dpcm);
 302         pos = dpcm->frac_pos / HZ;
 303         spin_unlock(&dpcm->lock);
 304         return pos;
 305 }
 306
 307 static int dummy_systimer_create(struct snd_pcm_substream *substream)
 308 {
 309         struct dummy_systimer_pcm *dpcm;
 310
 311         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
 312         if (!dpcm)
 313                 return -ENOMEM;
 314         substream->runtime->private_data = dpcm;
 315         init_timer(&dpcm->timer);
 316         dpcm->timer.data = (unsigned long) dpcm;
 317         dpcm->timer.function = dummy_systimer_callback;
 318         spin_lock_init(&dpcm->lock);
 319         dpcm->substream = substream;
 320         return 0;
 321 }
 322
 323 static void dummy_systimer_free(struct snd_pcm_substream *substream)
 324 {
 325         kfree(substream->runtime->private_data);
 326 }
 327
 328 static struct dummy_timer_ops dummy_systimer_ops = {
 329         .create =       dummy_systimer_create,
 330         .free =         dummy_systimer_free,
 331         .prepare =      dummy_systimer_prepare,
 332         .start =        dummy_systimer_start,
 333         .stop =         dummy_systimer_stop,
 334         .pointer =      dummy_systimer_pointer,
 335 };
 336
 337 #ifdef CONFIG_HIGH_RES_TIMERS
 338 /*
 339  * hrtimer interface
 340  */
 341
 342 struct dummy_hrtimer_pcm {
 343         ktime_t base_time;
 344         ktime_t period_time;
 345         atomic_t running;
 346         struct hrtimer timer;
 347         struct tasklet_struct tasklet;
 348         struct snd_pcm_substream *substream;
 349 };
 350
 351 static void dummy_hrtimer_pcm_elapsed(unsigned long priv)
 352 {
 353         struct dummy_hrtimer_pcm *dpcm = (struct dummy_hrtimer_pcm *)priv;
 354         if (atomic_read(&dpcm->running))
 355                 snd_pcm_period_elapsed(dpcm->substream);
 356 }
 357
 358 static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer)
 359 {
 360         struct dummy_hrtimer_pcm *dpcm;
 361
 362         dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer);
 363         if (!atomic_read(&dpcm->running))
 364                 return HRTIMER_NORESTART;
 365         tasklet_schedule(&dpcm->tasklet);
 366         hrtimer_forward_now(timer, dpcm->period_time);
 367         return HRTIMER_RESTART;
 368 }
 369
 370 static int dummy_hrtimer_start(struct snd_pcm_substream *substream)
 371 {
 372         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
 373
 374         dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer);
 375         hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL);
 376         atomic_set(&dpcm->running, 1);
 377         return 0;
 378 }
 379
 380 static int dummy_hrtimer_stop(struct snd_pcm_substream *substream)
 381 {
 382         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
 383
 384         atomic_set(&dpcm->running, 0);
 385         hrtimer_cancel(&dpcm->timer);
 386         return 0;
 387 }
 388
 389 static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
 390 {
 391         tasklet_kill(&dpcm->tasklet);
 392 }
 393
 394 static snd_pcm_uframes_t
 395 dummy_hrtimer_pointer(struct snd_pcm_substream *substream)
 396 {
 397         struct snd_pcm_runtime *runtime = substream->runtime;
 398         struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
 399         u64 delta;
 400         u32 pos;
 401
 402         delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer),
 403                                dpcm->base_time);
 404         delta = div_u64(delta * runtime->rate + 999999, 1000000);
 405         div_u64_rem(delta, runtime->buffer_size, &pos);
 406         return pos;
 407 }
 408
 409 static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream)
 410 {
 411         struct snd_pcm_runtime *runtime = substream->runtime;
 412         struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
 413         unsigned int period, rate;
 414         long sec;
 415         unsigned long nsecs;
 416
 417         dummy_hrtimer_sync(dpcm);
 418         period = runtime->period_size;
 419         rate = runtime->rate;
 420         sec = period / rate;
 421         period %= rate;
 422         nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate);
 423         dpcm->period_time = ktime_set(sec, nsecs);
 424
 425         return 0;
 426 }
 427
 428 static int dummy_hrtimer_create(struct snd_pcm_substream *substream)
 429 {
 430         struct dummy_hrtimer_pcm *dpcm;
 431
 432         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
 433         if (!dpcm)
 434                 return -ENOMEM;
 435         substream->runtime->private_data = dpcm;
 436         hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 437         dpcm->timer.function = dummy_hrtimer_callback;
 438         dpcm->substream = substream;
 439         atomic_set(&dpcm->running, 0);
 440         tasklet_init(&dpcm->tasklet, dummy_hrtimer_pcm_elapsed,
 441                      (unsigned long)dpcm);
 442         return 0;
 443 }
 444
 445 static void dummy_hrtimer_free(struct snd_pcm_substream *substream)
 446 {
 447         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
 448         dummy_hrtimer_sync(dpcm);
 449         kfree(dpcm);
 450 }
 451
 452 static struct dummy_timer_ops dummy_hrtimer_ops = {
 453         .create =       dummy_hrtimer_create,
 454         .free =         dummy_hrtimer_free,
 455         .prepare =      dummy_hrtimer_prepare,
 456         .start =        dummy_hrtimer_start,
 457         .stop =         dummy_hrtimer_stop,
 458         .pointer =      dummy_hrtimer_pointer,
 459 };
 460
 461 #endif /* CONFIG_HIGH_RES_TIMERS */
 462
 463 /*
 464  * PCM interface
 465  */
 466
 467 static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 468 {
 469         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
 470
 471         switch (cmd) {
 472         case SNDRV_PCM_TRIGGER_START:
 473         case SNDRV_PCM_TRIGGER_RESUME:
 474                 return dummy->timer_ops->start(substream);
 475         case SNDRV_PCM_TRIGGER_STOP:
 476         case SNDRV_PCM_TRIGGER_SUSPEND:
 477                 return dummy->timer_ops->stop(substream);
 478         }
 479         return -EINVAL;
 480 }
 481
 482 static int dummy_pcm_prepare(struct snd_pcm_substream *substream)
 483 {
 484         struct snd_pcm_runtime *runtime = substream->runtime;
 485         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
 486
 487         snd_pcm_format_set_silence(runtime->format, runtime->dma_area,
 488                         bytes_to_samples(runtime, runtime->dma_bytes));
 489         return dummy->timer_ops->prepare(substream);
 490 }
 491
 492 static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream)
 493 {
 494         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
 495
 496         return dummy->timer_ops->pointer(substream);
 497 }
 498
 499 static struct snd_pcm_hardware dummy_pcm_hardware = {
 500         .info =                 (SNDRV_PCM_INFO_MMAP |
 501                                  SNDRV_PCM_INFO_INTERLEAVED |
 502                                  SNDRV_PCM_INFO_RESUME |
 503                                  SNDRV_PCM_INFO_MMAP_VALID),
 504         .formats =              USE_FORMATS,
 505         .rates =                USE_RATE,
 506         .rate_min =             USE_RATE_MIN,
 507         .rate_max =             USE_RATE_MAX,
 508         .channels_min =         USE_CHANNELS_MIN,
 509         .channels_max =         USE_CHANNELS_MAX,
 510         .buffer_bytes_max =     MAX_BUFFER_SIZE,
 511         .period_bytes_min =     64,
 512         .period_bytes_max =     MAX_PERIOD_SIZE,
 513         .periods_min =          USE_PERIODS_MIN,
 514         .periods_max =          USE_PERIODS_MAX,
 515         .fifo_size =            0,
 516 };
 517
 518 static int dummy_pcm_hw_params(struct snd_pcm_substream *substream,
 519                                struct snd_pcm_hw_params *hw_params)
 520 {
 521         return snd_pcm_lib_malloc_pages(substream,
 522                                         params_buffer_bytes(hw_params));
 523 }
 524
 525 static int dummy_pcm_hw_free(struct snd_pcm_substream *substream)
 526 {
 527         return snd_pcm_lib_free_pages(substream);
 528 }
 529
 530 static int dummy_pcm_open(struct snd_pcm_substream *substream)
 531 {
 532         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
 533         struct snd_pcm_runtime *runtime = substream->runtime;
 534         int err;
 535
 536         dummy->timer_ops = &dummy_systimer_ops;
 537 #ifdef CONFIG_HIGH_RES_TIMERS
 538         if (hrtimer)
 539                 dummy->timer_ops = &dummy_hrtimer_ops;
 540 #endif
 541
 542         err = dummy->timer_ops->create(substream);
 543         if (err < 0)
 544                 return err;
 545
 546         runtime->hw = dummy_pcm_hardware;
 547         if (substream->pcm->device & 1) {
 548                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 549                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 550         }
 551         if (substream->pcm->device & 2)
 552                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
 553                                       SNDRV_PCM_INFO_MMAP_VALID);
 554
 555         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 556                 err = add_playback_constraints(substream->runtime);
 557         else
 558                 err = add_capture_constraints(substream->runtime);
 559         if (err < 0) {
 560                 dummy->timer_ops->free(substream);
 561                 return err;
 562         }
 563         return 0;
 564 }
 565
 566 static int dummy_pcm_close(struct snd_pcm_substream *substream)
 567 {
 568         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
 569         dummy->timer_ops->free(substream);
 570         return 0;
 571 }
 572
 573 static struct snd_pcm_ops dummy_pcm_ops = {
 574         .open =         dummy_pcm_open,
 575         .close =        dummy_pcm_close,
 576         .ioctl =        snd_pcm_lib_ioctl,
 577         .hw_params =    dummy_pcm_hw_params,
 578         .hw_free =      dummy_pcm_hw_free,
 579         .prepare =      dummy_pcm_prepare,
 580         .trigger =      dummy_pcm_trigger,
 581         .pointer =      dummy_pcm_pointer,
 582 };
 583
 584 static int __devinit snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
 585                                         int substreams)
 586 {
 587         struct snd_pcm *pcm;
 588         int err;
 589
 590         err = snd_pcm_new(dummy->card, "Dummy PCM", device,
 591                                substreams, substreams, &pcm);
 592         if (err < 0)
 593                 return err;
 594         dummy->pcm = pcm;
 595         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &dummy_pcm_ops);
 596         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &dummy_pcm_ops);
 597         pcm->private_data = dummy;
 598         pcm->info_flags = 0;
 599         strcpy(pcm->name, "Dummy PCM");
 600         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
 601                                               snd_dma_continuous_data(GFP_KERNEL),
 602                                               0, 64*1024);
 603         return 0;
 604 }
 605
 606 #define DUMMY_VOLUME(xname, xindex, addr) \
 607 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
 608   .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
 609   .name = xname, .index = xindex, \
 610   .info = snd_dummy_volume_info, \
 611   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
 612   .private_value = addr, \
 613   .tlv = { .p = db_scale_dummy } }
 614
 615 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
 616                                  struct snd_ctl_elem_info *uinfo)
 617 {
 618         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 619         uinfo->count = 2;
 620         uinfo->value.integer.min = -50;
 621         uinfo->value.integer.max = 100;
 622         return 0;
 623 }
 624
 625 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
 626                                 struct snd_ctl_elem_value *ucontrol)
 627 {
 628         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 629         int addr = kcontrol->private_value;
 630
 631         spin_lock_irq(&dummy->mixer_lock);
 632         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
 633         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
 634         spin_unlock_irq(&dummy->mixer_lock);
 635         return 0;
 636 }
 637
 638 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
 639                                 struct snd_ctl_elem_value *ucontrol)
 640 {
 641         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 642         int change, addr = kcontrol->private_value;
 643         int left, right;
 644
 645         left = ucontrol->value.integer.value[0];
 646         if (left < -50)
 647                 left = -50;
 648         if (left > 100)
 649                 left = 100;
 650         right = ucontrol->value.integer.value[1];
 651         if (right < -50)
 652                 right = -50;
 653         if (right > 100)
 654                 right = 100;
 655         spin_lock_irq(&dummy->mixer_lock);
 656         change = dummy->mixer_volume[addr][0] != left ||
 657                  dummy->mixer_volume[addr][1] != right;
 658         dummy->mixer_volume[addr][0] = left;
 659         dummy->mixer_volume[addr][1] = right;
 660         spin_unlock_irq(&dummy->mixer_lock);
 661         return change;
 662 }
 663
 664 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
 665
 666 #define DUMMY_CAPSRC(xname, xindex, addr) \
 667 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 668   .info = snd_dummy_capsrc_info, \
 669   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
 670   .private_value = addr }
 671
 672 #define snd_dummy_capsrc_info   snd_ctl_boolean_stereo_info
 673
 674 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
 675                                 struct snd_ctl_elem_value *ucontrol)
 676 {
 677         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 678         int addr = kcontrol->private_value;
 679
 680         spin_lock_irq(&dummy->mixer_lock);
 681         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
 682         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
 683         spin_unlock_irq(&dummy->mixer_lock);
 684         return 0;
 685 }
 686
 687 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 688 {
 689         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 690         int change, addr = kcontrol->private_value;
 691         int left, right;
 692
 693         left = ucontrol->value.integer.value[0] & 1;
 694         right = ucontrol->value.integer.value[1] & 1;
 695         spin_lock_irq(&dummy->mixer_lock);
 696         change = dummy->capture_source[addr][0] != left &&
 697                  dummy->capture_source[addr][1] != right;
 698         dummy->capture_source[addr][0] = left;
 699         dummy->capture_source[addr][1] = right;
 700         spin_unlock_irq(&dummy->mixer_lock);
 701         return change;
 702 }
 703
 704 static struct snd_kcontrol_new snd_dummy_controls[] = {
 705 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
 706 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
 707 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
 708 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
 709 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
 710 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
 711 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
 712 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
 713 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
 714 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD)
 715 };
 716
 717 static int __devinit snd_card_dummy_new_mixer(struct snd_dummy *dummy)
 718 {
 719         struct snd_card *card = dummy->card;
 720         unsigned int idx;
 721         int err;
 722
 723         if (snd_BUG_ON(!dummy))
 724                 return -EINVAL;
 725         spin_lock_init(&dummy->mixer_lock);
 726         strcpy(card->mixername, "Dummy Mixer");
 727
 728         for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
 729                 err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy));
 730                 if (err < 0)
 731                         return err;
 732         }
 733         return 0;
 734 }
 735
 736 static int __devinit snd_dummy_probe(struct platform_device *devptr)
 737 {
 738         struct snd_card *card;
 739         struct snd_dummy *dummy;
 740         int idx, err;
 741         int dev = devptr->id;
 742
 743         err = snd_card_create(index[dev], id[dev], THIS_MODULE,
 744                               sizeof(struct snd_dummy), &card);
 745         if (err < 0)
 746                 return err;
 747         dummy = card->private_data;
 748         dummy->card = card;
 749         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
 750                 if (pcm_substreams[dev] < 1)
 751                         pcm_substreams[dev] = 1;
 752                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
 753                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
 754                 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
 755                 if (err < 0)
 756                         goto __nodev;
 757         }
 758         err = snd_card_dummy_new_mixer(dummy);
 759         if (err < 0)
 760                 goto __nodev;
 761         strcpy(card->driver, "Dummy");
 762         strcpy(card->shortname, "Dummy");
 763         sprintf(card->longname, "Dummy %i", dev + 1);
 764
 765         snd_card_set_dev(card, &devptr->dev);
 766
 767         err = snd_card_register(card);
 768         if (err == 0) {
 769                 platform_set_drvdata(devptr, card);
 770                 return 0;
 771         }
 772       __nodev:
 773         snd_card_free(card);
 774         return err;
 775 }
 776
 777 static int __devexit snd_dummy_remove(struct platform_device *devptr)
 778 {
 779         snd_card_free(platform_get_drvdata(devptr));
 780         platform_set_drvdata(devptr, NULL);
 781         return 0;
 782 }
 783
 784 #ifdef CONFIG_PM
 785 static int snd_dummy_suspend(struct platform_device *pdev, pm_message_t state)
 786 {
 787         struct snd_card *card = platform_get_drvdata(pdev);
 788         struct snd_dummy *dummy = card->private_data;
 789
 790         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
 791         snd_pcm_suspend_all(dummy->pcm);
 792         return 0;
 793 }
 794
 795 static int snd_dummy_resume(struct platform_device *pdev)
 796 {
 797         struct snd_card *card = platform_get_drvdata(pdev);
 798
 799         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
 800         return 0;
 801 }
 802 #endif
 803
 804 #define SND_DUMMY_DRIVER        "snd_dummy"
 805
 806 static struct platform_driver snd_dummy_driver = {
 807         .probe          = snd_dummy_probe,
 808         .remove         = __devexit_p(snd_dummy_remove),
 809 #ifdef CONFIG_PM
 810         .suspend        = snd_dummy_suspend,
 811         .resume         = snd_dummy_resume,
 812 #endif
 813         .driver         = {
 814                 .name   = SND_DUMMY_DRIVER
 815         },
 816 };
 817
 818 static void snd_dummy_unregister_all(void)
 819 {
 820         int i;
 821
 822         for (i = 0; i < ARRAY_SIZE(devices); ++i)
 823                 platform_device_unregister(devices[i]);
 824         platform_driver_unregister(&snd_dummy_driver);
 825 }
 826
 827 static int __init alsa_card_dummy_init(void)
 828 {
 829         int i, cards, err;
 830
 831         err = platform_driver_register(&snd_dummy_driver);
 832         if (err < 0)
 833                 return err;
 834
 835         cards = 0;
 836         for (i = 0; i < SNDRV_CARDS; i++) {
 837                 struct platform_device *device;
 838                 if (! enable[i])
 839                         continue;
 840                 device = platform_device_register_simple(SND_DUMMY_DRIVER,
 841                                                          i, NULL, 0);
 842                 if (IS_ERR(device))
 843                         continue;
 844                 if (!platform_get_drvdata(device)) {
 845                         platform_device_unregister(device);
 846                         continue;
 847                 }
 848                 devices[i] = device;
 849                 cards++;
 850         }
 851         if (!cards) {
 852 #ifdef MODULE
 853                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
 854 #endif
 855                 snd_dummy_unregister_all();
 856                 return -ENODEV;
 857         }
 858         return 0;
 859 }
 860
 861 static void __exit alsa_card_dummy_exit(void)
 862 {
 863         snd_dummy_unregister_all();
 864 }
 865
 866 module_init(alsa_card_dummy_init)
 867 module_exit(alsa_card_dummy_exit)