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_buffer_size;  /* buffer_size * HZ */
 211         unsigned int frac_period_size;  /* period_size * HZ */
 212         unsigned int rate;
 213         struct snd_pcm_substream *substream;
 214 };
 215
 216 static void dummy_systimer_rearm(struct dummy_systimer_pcm *dpcm)
 217 {
 218         unsigned long frac;
 219
 220         frac = dpcm->frac_pos % dpcm->frac_period_size;
 221         dpcm->timer.expires = jiffies +
 222                 (dpcm->frac_period_size + dpcm->rate - 1) / dpcm->rate;
 223         add_timer(&dpcm->timer);
 224 }
 225
 226 static void dummy_systimer_update(struct dummy_systimer_pcm *dpcm)
 227 {
 228         unsigned long delta;
 229
 230         delta = jiffies - dpcm->base_time;
 231         if (!delta)
 232                 return;
 233         dpcm->base_time = jiffies;
 234         dpcm->frac_pos += delta * dpcm->rate;
 235         while (dpcm->frac_pos >= dpcm->frac_buffer_size)
 236                 dpcm->frac_pos -= dpcm->frac_buffer_size;
 237 }
 238
 239 static int dummy_systimer_start(struct snd_pcm_substream *substream)
 240 {
 241         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
 242         spin_lock(&dpcm->lock);
 243         dpcm->base_time = jiffies;
 244         dummy_systimer_rearm(dpcm);
 245         spin_unlock(&dpcm->lock);
 246         return 0;
 247 }
 248
 249 static int dummy_systimer_stop(struct snd_pcm_substream *substream)
 250 {
 251         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
 252         spin_lock(&dpcm->lock);
 253         del_timer(&dpcm->timer);
 254         spin_unlock(&dpcm->lock);
 255         return 0;
 256 }
 257
 258 static int dummy_systimer_prepare(struct snd_pcm_substream *substream)
 259 {
 260         struct snd_pcm_runtime *runtime = substream->runtime;
 261         struct dummy_systimer_pcm *dpcm = runtime->private_data;
 262
 263         dpcm->frac_pos = 0;
 264         dpcm->rate = runtime->rate;
 265         dpcm->frac_buffer_size = runtime->buffer_size * HZ;
 266         dpcm->frac_period_size = runtime->period_size * HZ;
 267
 268         return 0;
 269 }
 270
 271 static void dummy_systimer_callback(unsigned long data)
 272 {
 273         struct dummy_systimer_pcm *dpcm = (struct dummy_systimer_pcm *)data;
 274         unsigned long flags;
 275
 276         spin_lock_irqsave(&dpcm->lock, flags);
 277         dummy_systimer_update(dpcm);
 278         dummy_systimer_rearm(dpcm);
 279         spin_unlock_irqrestore(&dpcm->lock, flags);
 280         snd_pcm_period_elapsed(dpcm->substream);
 281 }
 282
 283 static snd_pcm_uframes_t
 284 dummy_systimer_pointer(struct snd_pcm_substream *substream)
 285 {
 286         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
 287
 288         spin_lock(&dpcm->lock);
 289         dummy_systimer_update(dpcm);
 290         spin_unlock(&dpcm->lock);
 291         return dpcm->frac_pos / HZ;
 292 }
 293
 294 static int dummy_systimer_create(struct snd_pcm_substream *substream)
 295 {
 296         struct dummy_systimer_pcm *dpcm;
 297
 298         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
 299         if (!dpcm)
 300                 return -ENOMEM;
 301         substream->runtime->private_data = dpcm;
 302         init_timer(&dpcm->timer);
 303         dpcm->timer.data = (unsigned long) dpcm;
 304         dpcm->timer.function = dummy_systimer_callback;
 305         spin_lock_init(&dpcm->lock);
 306         dpcm->substream = substream;
 307         return 0;
 308 }
 309
 310 static void dummy_systimer_free(struct snd_pcm_substream *substream)
 311 {
 312         kfree(substream->runtime->private_data);
 313 }
 314
 315 static struct dummy_timer_ops dummy_systimer_ops = {
 316         .create =       dummy_systimer_create,
 317         .free =         dummy_systimer_free,
 318         .prepare =      dummy_systimer_prepare,
 319         .start =        dummy_systimer_start,
 320         .stop =         dummy_systimer_stop,
 321         .pointer =      dummy_systimer_pointer,
 322 };
 323
 324 #ifdef CONFIG_HIGH_RES_TIMERS
 325 /*
 326  * hrtimer interface
 327  */
 328
 329 struct dummy_hrtimer_pcm {
 330         ktime_t base_time;
 331         ktime_t period_time;
 332         atomic_t running;
 333         struct hrtimer timer;
 334         struct tasklet_struct tasklet;
 335         struct snd_pcm_substream *substream;
 336 };
 337
 338 static void dummy_hrtimer_pcm_elapsed(unsigned long priv)
 339 {
 340         struct dummy_hrtimer_pcm *dpcm = (struct dummy_hrtimer_pcm *)priv;
 341         if (atomic_read(&dpcm->running))
 342                 snd_pcm_period_elapsed(dpcm->substream);
 343 }
 344
 345 static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer)
 346 {
 347         struct dummy_hrtimer_pcm *dpcm;
 348
 349         dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer);
 350         if (!atomic_read(&dpcm->running))
 351                 return HRTIMER_NORESTART;
 352         tasklet_schedule(&dpcm->tasklet);
 353         hrtimer_forward_now(timer, dpcm->period_time);
 354         return HRTIMER_RESTART;
 355 }
 356
 357 static int dummy_hrtimer_start(struct snd_pcm_substream *substream)
 358 {
 359         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
 360
 361         dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer);
 362         hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL);
 363         atomic_set(&dpcm->running, 1);
 364         return 0;
 365 }
 366
 367 static int dummy_hrtimer_stop(struct snd_pcm_substream *substream)
 368 {
 369         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
 370
 371         atomic_set(&dpcm->running, 0);
 372         hrtimer_cancel(&dpcm->timer);
 373         return 0;
 374 }
 375
 376 static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
 377 {
 378         tasklet_kill(&dpcm->tasklet);
 379 }
 380
 381 static snd_pcm_uframes_t
 382 dummy_hrtimer_pointer(struct snd_pcm_substream *substream)
 383 {
 384         struct snd_pcm_runtime *runtime = substream->runtime;
 385         struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
 386         u64 delta;
 387         u32 pos;
 388
 389         delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer),
 390                                dpcm->base_time);
 391         delta = div_u64(delta * runtime->rate + 999999, 1000000);
 392         div_u64_rem(delta, runtime->buffer_size, &pos);
 393         return pos;
 394 }
 395
 396 static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream)
 397 {
 398         struct snd_pcm_runtime *runtime = substream->runtime;
 399         struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
 400         unsigned int period, rate;
 401         long sec;
 402         unsigned long nsecs;
 403
 404         dummy_hrtimer_sync(dpcm);
 405         period = runtime->period_size;
 406         rate = runtime->rate;
 407         sec = period / rate;
 408         period %= rate;
 409         nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate);
 410         dpcm->period_time = ktime_set(sec, nsecs);
 411
 412         return 0;
 413 }
 414
 415 static int dummy_hrtimer_create(struct snd_pcm_substream *substream)
 416 {
 417         struct dummy_hrtimer_pcm *dpcm;
 418
 419         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
 420         if (!dpcm)
 421                 return -ENOMEM;
 422         substream->runtime->private_data = dpcm;
 423         hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 424         dpcm->timer.function = dummy_hrtimer_callback;
 425         dpcm->substream = substream;
 426         atomic_set(&dpcm->running, 0);
 427         tasklet_init(&dpcm->tasklet, dummy_hrtimer_pcm_elapsed,
 428                      (unsigned long)dpcm);
 429         return 0;
 430 }
 431
 432 static void dummy_hrtimer_free(struct snd_pcm_substream *substream)
 433 {
 434         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
 435         dummy_hrtimer_sync(dpcm);
 436         kfree(dpcm);
 437 }
 438
 439 static struct dummy_timer_ops dummy_hrtimer_ops = {
 440         .create =       dummy_hrtimer_create,
 441         .free =         dummy_hrtimer_free,
 442         .prepare =      dummy_hrtimer_prepare,
 443         .start =        dummy_hrtimer_start,
 444         .stop =         dummy_hrtimer_stop,
 445         .pointer =      dummy_hrtimer_pointer,
 446 };
 447
 448 #endif /* CONFIG_HIGH_RES_TIMERS */
 449
 450 /*
 451  * PCM interface
 452  */
 453
 454 static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 455 {
 456         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
 457
 458         switch (cmd) {
 459         case SNDRV_PCM_TRIGGER_START:
 460         case SNDRV_PCM_TRIGGER_RESUME:
 461                 return dummy->timer_ops->start(substream);
 462         case SNDRV_PCM_TRIGGER_STOP:
 463         case SNDRV_PCM_TRIGGER_SUSPEND:
 464                 return dummy->timer_ops->stop(substream);
 465         }
 466         return -EINVAL;
 467 }
 468
 469 static int dummy_pcm_prepare(struct snd_pcm_substream *substream)
 470 {
 471         struct snd_pcm_runtime *runtime = substream->runtime;
 472         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
 473
 474         snd_pcm_format_set_silence(runtime->format, runtime->dma_area,
 475                         bytes_to_samples(runtime, runtime->dma_bytes));
 476         return dummy->timer_ops->prepare(substream);
 477 }
 478
 479 static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream)
 480 {
 481         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
 482
 483         return dummy->timer_ops->pointer(substream);
 484 }
 485
 486 static struct snd_pcm_hardware dummy_pcm_hardware = {
 487         .info =                 (SNDRV_PCM_INFO_MMAP |
 488                                  SNDRV_PCM_INFO_INTERLEAVED |
 489                                  SNDRV_PCM_INFO_RESUME |
 490                                  SNDRV_PCM_INFO_MMAP_VALID),
 491         .formats =              USE_FORMATS,
 492         .rates =                USE_RATE,
 493         .rate_min =             USE_RATE_MIN,
 494         .rate_max =             USE_RATE_MAX,
 495         .channels_min =         USE_CHANNELS_MIN,
 496         .channels_max =         USE_CHANNELS_MAX,
 497         .buffer_bytes_max =     MAX_BUFFER_SIZE,
 498         .period_bytes_min =     64,
 499         .period_bytes_max =     MAX_PERIOD_SIZE,
 500         .periods_min =          USE_PERIODS_MIN,
 501         .periods_max =          USE_PERIODS_MAX,
 502         .fifo_size =            0,
 503 };
 504
 505 static int dummy_pcm_hw_params(struct snd_pcm_substream *substream,
 506                                struct snd_pcm_hw_params *hw_params)
 507 {
 508         return snd_pcm_lib_malloc_pages(substream,
 509                                         params_buffer_bytes(hw_params));
 510 }
 511
 512 static int dummy_pcm_hw_free(struct snd_pcm_substream *substream)
 513 {
 514         return snd_pcm_lib_free_pages(substream);
 515 }
 516
 517 static int dummy_pcm_open(struct snd_pcm_substream *substream)
 518 {
 519         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
 520         struct snd_pcm_runtime *runtime = substream->runtime;
 521         int err;
 522
 523         dummy->timer_ops = &dummy_systimer_ops;
 524 #ifdef CONFIG_HIGH_RES_TIMERS
 525         if (hrtimer)
 526                 dummy->timer_ops = &dummy_hrtimer_ops;
 527 #endif
 528
 529         err = dummy->timer_ops->create(substream);
 530         if (err < 0)
 531                 return err;
 532
 533         runtime->hw = dummy_pcm_hardware;
 534         if (substream->pcm->device & 1) {
 535                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 536                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 537         }
 538         if (substream->pcm->device & 2)
 539                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
 540                                       SNDRV_PCM_INFO_MMAP_VALID);
 541
 542         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 543                 err = add_playback_constraints(substream->runtime);
 544         else
 545                 err = add_capture_constraints(substream->runtime);
 546         if (err < 0) {
 547                 dummy->timer_ops->free(substream);
 548                 return err;
 549         }
 550         return 0;
 551 }
 552
 553 static int dummy_pcm_close(struct snd_pcm_substream *substream)
 554 {
 555         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
 556         dummy->timer_ops->free(substream);
 557         return 0;
 558 }
 559
 560 static struct snd_pcm_ops dummy_pcm_ops = {
 561         .open =         dummy_pcm_open,
 562         .close =        dummy_pcm_close,
 563         .ioctl =        snd_pcm_lib_ioctl,
 564         .hw_params =    dummy_pcm_hw_params,
 565         .hw_free =      dummy_pcm_hw_free,
 566         .prepare =      dummy_pcm_prepare,
 567         .trigger =      dummy_pcm_trigger,
 568         .pointer =      dummy_pcm_pointer,
 569 };
 570
 571 static int __devinit snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
 572                                         int substreams)
 573 {
 574         struct snd_pcm *pcm;
 575         int err;
 576
 577         err = snd_pcm_new(dummy->card, "Dummy PCM", device,
 578                                substreams, substreams, &pcm);
 579         if (err < 0)
 580                 return err;
 581         dummy->pcm = pcm;
 582         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &dummy_pcm_ops);
 583         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &dummy_pcm_ops);
 584         pcm->private_data = dummy;
 585         pcm->info_flags = 0;
 586         strcpy(pcm->name, "Dummy PCM");
 587         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
 588                                               snd_dma_continuous_data(GFP_KERNEL),
 589                                               0, 64*1024);
 590         return 0;
 591 }
 592
 593 #define DUMMY_VOLUME(xname, xindex, addr) \
 594 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
 595   .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
 596   .name = xname, .index = xindex, \
 597   .info = snd_dummy_volume_info, \
 598   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
 599   .private_value = addr, \
 600   .tlv = { .p = db_scale_dummy } }
 601
 602 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
 603                                  struct snd_ctl_elem_info *uinfo)
 604 {
 605         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 606         uinfo->count = 2;
 607         uinfo->value.integer.min = -50;
 608         uinfo->value.integer.max = 100;
 609         return 0;
 610 }
 611
 612 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
 613                                 struct snd_ctl_elem_value *ucontrol)
 614 {
 615         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 616         int addr = kcontrol->private_value;
 617
 618         spin_lock_irq(&dummy->mixer_lock);
 619         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
 620         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
 621         spin_unlock_irq(&dummy->mixer_lock);
 622         return 0;
 623 }
 624
 625 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
 626                                 struct snd_ctl_elem_value *ucontrol)
 627 {
 628         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 629         int change, addr = kcontrol->private_value;
 630         int left, right;
 631
 632         left = ucontrol->value.integer.value[0];
 633         if (left < -50)
 634                 left = -50;
 635         if (left > 100)
 636                 left = 100;
 637         right = ucontrol->value.integer.value[1];
 638         if (right < -50)
 639                 right = -50;
 640         if (right > 100)
 641                 right = 100;
 642         spin_lock_irq(&dummy->mixer_lock);
 643         change = dummy->mixer_volume[addr][0] != left ||
 644                  dummy->mixer_volume[addr][1] != right;
 645         dummy->mixer_volume[addr][0] = left;
 646         dummy->mixer_volume[addr][1] = right;
 647         spin_unlock_irq(&dummy->mixer_lock);
 648         return change;
 649 }
 650
 651 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
 652
 653 #define DUMMY_CAPSRC(xname, xindex, addr) \
 654 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 655   .info = snd_dummy_capsrc_info, \
 656   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
 657   .private_value = addr }
 658
 659 #define snd_dummy_capsrc_info   snd_ctl_boolean_stereo_info
 660
 661 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
 662                                 struct snd_ctl_elem_value *ucontrol)
 663 {
 664         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 665         int addr = kcontrol->private_value;
 666
 667         spin_lock_irq(&dummy->mixer_lock);
 668         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
 669         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
 670         spin_unlock_irq(&dummy->mixer_lock);
 671         return 0;
 672 }
 673
 674 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 675 {
 676         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 677         int change, addr = kcontrol->private_value;
 678         int left, right;
 679
 680         left = ucontrol->value.integer.value[0] & 1;
 681         right = ucontrol->value.integer.value[1] & 1;
 682         spin_lock_irq(&dummy->mixer_lock);
 683         change = dummy->capture_source[addr][0] != left &&
 684                  dummy->capture_source[addr][1] != right;
 685         dummy->capture_source[addr][0] = left;
 686         dummy->capture_source[addr][1] = right;
 687         spin_unlock_irq(&dummy->mixer_lock);
 688         return change;
 689 }
 690
 691 static struct snd_kcontrol_new snd_dummy_controls[] = {
 692 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
 693 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
 694 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
 695 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
 696 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
 697 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
 698 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
 699 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
 700 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
 701 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD)
 702 };
 703
 704 static int __devinit snd_card_dummy_new_mixer(struct snd_dummy *dummy)
 705 {
 706         struct snd_card *card = dummy->card;
 707         unsigned int idx;
 708         int err;
 709
 710         if (snd_BUG_ON(!dummy))
 711                 return -EINVAL;
 712         spin_lock_init(&dummy->mixer_lock);
 713         strcpy(card->mixername, "Dummy Mixer");
 714
 715         for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
 716                 err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy));
 717                 if (err < 0)
 718                         return err;
 719         }
 720         return 0;
 721 }
 722
 723 static int __devinit snd_dummy_probe(struct platform_device *devptr)
 724 {
 725         struct snd_card *card;
 726         struct snd_dummy *dummy;
 727         int idx, err;
 728         int dev = devptr->id;
 729
 730         err = snd_card_create(index[dev], id[dev], THIS_MODULE,
 731                               sizeof(struct snd_dummy), &card);
 732         if (err < 0)
 733                 return err;
 734         dummy = card->private_data;
 735         dummy->card = card;
 736         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
 737                 if (pcm_substreams[dev] < 1)
 738                         pcm_substreams[dev] = 1;
 739                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
 740                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
 741                 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
 742                 if (err < 0)
 743                         goto __nodev;
 744         }
 745         err = snd_card_dummy_new_mixer(dummy);
 746         if (err < 0)
 747                 goto __nodev;
 748         strcpy(card->driver, "Dummy");
 749         strcpy(card->shortname, "Dummy");
 750         sprintf(card->longname, "Dummy %i", dev + 1);
 751
 752         snd_card_set_dev(card, &devptr->dev);
 753
 754         err = snd_card_register(card);
 755         if (err == 0) {
 756                 platform_set_drvdata(devptr, card);
 757                 return 0;
 758         }
 759       __nodev:
 760         snd_card_free(card);
 761         return err;
 762 }
 763
 764 static int __devexit snd_dummy_remove(struct platform_device *devptr)
 765 {
 766         snd_card_free(platform_get_drvdata(devptr));
 767         platform_set_drvdata(devptr, NULL);
 768         return 0;
 769 }
 770
 771 #ifdef CONFIG_PM
 772 static int snd_dummy_suspend(struct platform_device *pdev, pm_message_t state)
 773 {
 774         struct snd_card *card = platform_get_drvdata(pdev);
 775         struct snd_dummy *dummy = card->private_data;
 776
 777         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
 778         snd_pcm_suspend_all(dummy->pcm);
 779         return 0;
 780 }
 781
 782 static int snd_dummy_resume(struct platform_device *pdev)
 783 {
 784         struct snd_card *card = platform_get_drvdata(pdev);
 785
 786         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
 787         return 0;
 788 }
 789 #endif
 790
 791 #define SND_DUMMY_DRIVER        "snd_dummy"
 792
 793 static struct platform_driver snd_dummy_driver = {
 794         .probe          = snd_dummy_probe,
 795         .remove         = __devexit_p(snd_dummy_remove),
 796 #ifdef CONFIG_PM
 797         .suspend        = snd_dummy_suspend,
 798         .resume         = snd_dummy_resume,
 799 #endif
 800         .driver         = {
 801                 .name   = SND_DUMMY_DRIVER
 802         },
 803 };
 804
 805 static void snd_dummy_unregister_all(void)
 806 {
 807         int i;
 808
 809         for (i = 0; i < ARRAY_SIZE(devices); ++i)
 810                 platform_device_unregister(devices[i]);
 811         platform_driver_unregister(&snd_dummy_driver);
 812 }
 813
 814 static int __init alsa_card_dummy_init(void)
 815 {
 816         int i, cards, err;
 817
 818         err = platform_driver_register(&snd_dummy_driver);
 819         if (err < 0)
 820                 return err;
 821
 822         cards = 0;
 823         for (i = 0; i < SNDRV_CARDS; i++) {
 824                 struct platform_device *device;
 825                 if (! enable[i])
 826                         continue;
 827                 device = platform_device_register_simple(SND_DUMMY_DRIVER,
 828                                                          i, NULL, 0);
 829                 if (IS_ERR(device))
 830                         continue;
 831                 if (!platform_get_drvdata(device)) {
 832                         platform_device_unregister(device);
 833                         continue;
 834                 }
 835                 devices[i] = device;
 836                 cards++;
 837         }
 838         if (!cards) {
 839 #ifdef MODULE
 840                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
 841 #endif
 842                 snd_dummy_unregister_all();
 843                 return -ENODEV;
 844         }
 845         return 0;
 846 }
 847
 848 static void __exit alsa_card_dummy_exit(void)
 849 {
 850         snd_dummy_unregister_all();
 851 }
 852
 853 module_init(alsa_card_dummy_init)
 854 module_exit(alsa_card_dummy_exit)