git.oblomov.eu Git - linux-2.6/blob - 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/moduleparam.h>
  29 #include <sound/core.h>
  30 #include <sound/control.h>
  31 #include <sound/tlv.h>
  32 #include <sound/pcm.h>
  33 #include <sound/rawmidi.h>
  34 #include <sound/initval.h>
  35
  36 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  37 MODULE_DESCRIPTION("Dummy soundcard (/dev/null)");
  38 MODULE_LICENSE("GPL");
  39 MODULE_SUPPORTED_DEVICE("{{ALSA,Dummy soundcard}}");
  40
  41 #define MAX_PCM_DEVICES         4
  42 #define MAX_PCM_SUBSTREAMS      16
  43 #define MAX_MIDI_DEVICES        2
  44
  45 #if 0 /* emu10k1 emulation */
  46 #define MAX_BUFFER_SIZE         (128 * 1024)
  47 static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime)
  48 {
  49         int err;
  50         if ((err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
  51                 return err;
  52         if ((err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX)) < 0)
  53                 return err;
  54         return 0;
  55 }
  56 #define add_playback_constraints emu10k1_playback_constraints
  57 #endif
  58
  59 #if 0 /* RME9652 emulation */
  60 #define MAX_BUFFER_SIZE         (26 * 64 * 1024)
  61 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
  62 #define USE_CHANNELS_MIN        26
  63 #define USE_CHANNELS_MAX        26
  64 #define USE_PERIODS_MIN         2
  65 #define USE_PERIODS_MAX         2
  66 #endif
  67
  68 #if 0 /* ICE1712 emulation */
  69 #define MAX_BUFFER_SIZE         (256 * 1024)
  70 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
  71 #define USE_CHANNELS_MIN        10
  72 #define USE_CHANNELS_MAX        10
  73 #define USE_PERIODS_MIN         1
  74 #define USE_PERIODS_MAX         1024
  75 #endif
  76
  77 #if 0 /* UDA1341 emulation */
  78 #define MAX_BUFFER_SIZE         (16380)
  79 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
  80 #define USE_CHANNELS_MIN        2
  81 #define USE_CHANNELS_MAX        2
  82 #define USE_PERIODS_MIN         2
  83 #define USE_PERIODS_MAX         255
  84 #endif
  85
  86 #if 0 /* simple AC97 bridge (intel8x0) with 48kHz AC97 only codec */
  87 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
  88 #define USE_CHANNELS_MIN        2
  89 #define USE_CHANNELS_MAX        2
  90 #define USE_RATE                SNDRV_PCM_RATE_48000
  91 #define USE_RATE_MIN            48000
  92 #define USE_RATE_MAX            48000
  93 #endif
  94
  95 #if 0 /* CA0106 */
  96 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
  97 #define USE_CHANNELS_MIN        2
  98 #define USE_CHANNELS_MAX        2
  99 #define USE_RATE                (SNDRV_PCM_RATE_48000|SNDRV_PCM_RATE_96000|SNDRV_PCM_RATE_192000)
 100 #define USE_RATE_MIN            48000
 101 #define USE_RATE_MAX            192000
 102 #define MAX_BUFFER_SIZE         ((65536-64)*8)
 103 #define MAX_PERIOD_SIZE         (65536-64)
 104 #define USE_PERIODS_MIN         2
 105 #define USE_PERIODS_MAX         8
 106 #endif
 107
 108
 109 /* defaults */
 110 #ifndef MAX_BUFFER_SIZE
 111 #define MAX_BUFFER_SIZE         (64*1024)
 112 #endif
 113 #ifndef MAX_PERIOD_SIZE
 114 #define MAX_PERIOD_SIZE         MAX_BUFFER_SIZE
 115 #endif
 116 #ifndef USE_FORMATS
 117 #define USE_FORMATS             (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)
 118 #endif
 119 #ifndef USE_RATE
 120 #define USE_RATE                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000
 121 #define USE_RATE_MIN            5500
 122 #define USE_RATE_MAX            48000
 123 #endif
 124 #ifndef USE_CHANNELS_MIN
 125 #define USE_CHANNELS_MIN        1
 126 #endif
 127 #ifndef USE_CHANNELS_MAX
 128 #define USE_CHANNELS_MAX        2
 129 #endif
 130 #ifndef USE_PERIODS_MIN
 131 #define USE_PERIODS_MIN         1
 132 #endif
 133 #ifndef USE_PERIODS_MAX
 134 #define USE_PERIODS_MAX         1024
 135 #endif
 136 #ifndef add_playback_constraints
 137 #define add_playback_constraints(x) 0
 138 #endif
 139 #ifndef add_capture_constraints
 140 #define add_capture_constraints(x) 0
 141 #endif
 142
 143 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
 144 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
 145 static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
 146 static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
 147 static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
 148 //static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
 149
 150 module_param_array(index, int, NULL, 0444);
 151 MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
 152 module_param_array(id, charp, NULL, 0444);
 153 MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
 154 module_param_array(enable, bool, NULL, 0444);
 155 MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
 156 module_param_array(pcm_devs, int, NULL, 0444);
 157 MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
 158 module_param_array(pcm_substreams, int, NULL, 0444);
 159 MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-16) for dummy driver.");
 160 //module_param_array(midi_devs, int, NULL, 0444);
 161 //MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
 162
 163 static struct platform_device *devices[SNDRV_CARDS];
 164
 165 #define MIXER_ADDR_MASTER       0
 166 #define MIXER_ADDR_LINE         1
 167 #define MIXER_ADDR_MIC          2
 168 #define MIXER_ADDR_SYNTH        3
 169 #define MIXER_ADDR_CD           4
 170 #define MIXER_ADDR_LAST         4
 171
 172 struct snd_dummy {
 173         struct snd_card *card;
 174         struct snd_pcm *pcm;
 175         spinlock_t mixer_lock;
 176         int mixer_volume[MIXER_ADDR_LAST+1][2];
 177         int capture_source[MIXER_ADDR_LAST+1][2];
 178 };
 179
 180 struct snd_dummy_pcm {
 181         struct snd_dummy *dummy;
 182         spinlock_t lock;
 183         struct timer_list timer;
 184         unsigned int pcm_size;
 185         unsigned int pcm_count;
 186         unsigned int pcm_bps;           /* bytes per second */
 187         unsigned int pcm_jiffie;        /* bytes per one jiffie */
 188         unsigned int pcm_irq_pos;       /* IRQ position */
 189         unsigned int pcm_buf_pos;       /* position in buffer */
 190         struct snd_pcm_substream *substream;
 191 };
 192
 193
 194 static inline void snd_card_dummy_pcm_timer_start(struct snd_dummy_pcm *dpcm)
 195 {
 196         dpcm->timer.expires = 1 + jiffies;
 197         add_timer(&dpcm->timer);
 198 }
 199
 200 static inline void snd_card_dummy_pcm_timer_stop(struct snd_dummy_pcm *dpcm)
 201 {
 202         del_timer(&dpcm->timer);
 203 }
 204
 205 static int snd_card_dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 206 {
 207         struct snd_pcm_runtime *runtime = substream->runtime;
 208         struct snd_dummy_pcm *dpcm = runtime->private_data;
 209         int err = 0;
 210
 211         spin_lock(&dpcm->lock);
 212         switch (cmd) {
 213         case SNDRV_PCM_TRIGGER_START:
 214         case SNDRV_PCM_TRIGGER_RESUME:
 215                 snd_card_dummy_pcm_timer_start(dpcm);
 216                 break;
 217         case SNDRV_PCM_TRIGGER_STOP:
 218         case SNDRV_PCM_TRIGGER_SUSPEND:
 219                 snd_card_dummy_pcm_timer_stop(dpcm);
 220                 break;
 221         default:
 222                 err = -EINVAL;
 223                 break;
 224         }
 225         spin_unlock(&dpcm->lock);
 226         return 0;
 227 }
 228
 229 static int snd_card_dummy_pcm_prepare(struct snd_pcm_substream *substream)
 230 {
 231         struct snd_pcm_runtime *runtime = substream->runtime;
 232         struct snd_dummy_pcm *dpcm = runtime->private_data;
 233         unsigned int bps;
 234
 235         bps = runtime->rate * runtime->channels;
 236         bps *= snd_pcm_format_width(runtime->format);
 237         bps /= 8;
 238         if (bps <= 0)
 239                 return -EINVAL;
 240         dpcm->pcm_bps = bps;
 241         dpcm->pcm_jiffie = bps / HZ;
 242         dpcm->pcm_size = snd_pcm_lib_buffer_bytes(substream);
 243         dpcm->pcm_count = snd_pcm_lib_period_bytes(substream);
 244         dpcm->pcm_irq_pos = 0;
 245         dpcm->pcm_buf_pos = 0;
 246         return 0;
 247 }
 248
 249 static void snd_card_dummy_pcm_timer_function(unsigned long data)
 250 {
 251         struct snd_dummy_pcm *dpcm = (struct snd_dummy_pcm *)data;
 252         unsigned long flags;
 253
 254         spin_lock_irqsave(&dpcm->lock, flags);
 255         dpcm->timer.expires = 1 + jiffies;
 256         add_timer(&dpcm->timer);
 257         dpcm->pcm_irq_pos += dpcm->pcm_jiffie;
 258         dpcm->pcm_buf_pos += dpcm->pcm_jiffie;
 259         dpcm->pcm_buf_pos %= dpcm->pcm_size;
 260         if (dpcm->pcm_irq_pos >= dpcm->pcm_count) {
 261                 dpcm->pcm_irq_pos %= dpcm->pcm_count;
 262                 spin_unlock_irqrestore(&dpcm->lock, flags);
 263                 snd_pcm_period_elapsed(dpcm->substream);
 264         } else
 265                 spin_unlock_irqrestore(&dpcm->lock, flags);
 266 }
 267
 268 static snd_pcm_uframes_t snd_card_dummy_pcm_pointer(struct snd_pcm_substream *substream)
 269 {
 270         struct snd_pcm_runtime *runtime = substream->runtime;
 271         struct snd_dummy_pcm *dpcm = runtime->private_data;
 272
 273         return bytes_to_frames(runtime, dpcm->pcm_buf_pos);
 274 }
 275
 276 static struct snd_pcm_hardware snd_card_dummy_playback =
 277 {
 278         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 279                                  SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
 280         .formats =              USE_FORMATS,
 281         .rates =                USE_RATE,
 282         .rate_min =             USE_RATE_MIN,
 283         .rate_max =             USE_RATE_MAX,
 284         .channels_min =         USE_CHANNELS_MIN,
 285         .channels_max =         USE_CHANNELS_MAX,
 286         .buffer_bytes_max =     MAX_BUFFER_SIZE,
 287         .period_bytes_min =     64,
 288         .period_bytes_max =     MAX_PERIOD_SIZE,
 289         .periods_min =          USE_PERIODS_MIN,
 290         .periods_max =          USE_PERIODS_MAX,
 291         .fifo_size =            0,
 292 };
 293
 294 static struct snd_pcm_hardware snd_card_dummy_capture =
 295 {
 296         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 297                                  SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
 298         .formats =              USE_FORMATS,
 299         .rates =                USE_RATE,
 300         .rate_min =             USE_RATE_MIN,
 301         .rate_max =             USE_RATE_MAX,
 302         .channels_min =         USE_CHANNELS_MIN,
 303         .channels_max =         USE_CHANNELS_MAX,
 304         .buffer_bytes_max =     MAX_BUFFER_SIZE,
 305         .period_bytes_min =     64,
 306         .period_bytes_max =     MAX_PERIOD_SIZE,
 307         .periods_min =          USE_PERIODS_MIN,
 308         .periods_max =          USE_PERIODS_MAX,
 309         .fifo_size =            0,
 310 };
 311
 312 static void snd_card_dummy_runtime_free(struct snd_pcm_runtime *runtime)
 313 {
 314         kfree(runtime->private_data);
 315 }
 316
 317 static int snd_card_dummy_hw_params(struct snd_pcm_substream *substream,
 318                                     struct snd_pcm_hw_params *hw_params)
 319 {
 320         return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
 321 }
 322
 323 static int snd_card_dummy_hw_free(struct snd_pcm_substream *substream)
 324 {
 325         return snd_pcm_lib_free_pages(substream);
 326 }
 327
 328 static struct snd_dummy_pcm *new_pcm_stream(struct snd_pcm_substream *substream)
 329 {
 330         struct snd_dummy_pcm *dpcm;
 331
 332         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
 333         if (! dpcm)
 334                 return dpcm;
 335         init_timer(&dpcm->timer);
 336         dpcm->timer.data = (unsigned long) dpcm;
 337         dpcm->timer.function = snd_card_dummy_pcm_timer_function;
 338         spin_lock_init(&dpcm->lock);
 339         dpcm->substream = substream;
 340         return dpcm;
 341 }
 342
 343 static int snd_card_dummy_playback_open(struct snd_pcm_substream *substream)
 344 {
 345         struct snd_pcm_runtime *runtime = substream->runtime;
 346         struct snd_dummy_pcm *dpcm;
 347         int err;
 348
 349         if ((dpcm = new_pcm_stream(substream)) == NULL)
 350                 return -ENOMEM;
 351         runtime->private_data = dpcm;
 352         runtime->private_free = snd_card_dummy_runtime_free;
 353         runtime->hw = snd_card_dummy_playback;
 354         if (substream->pcm->device & 1) {
 355                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 356                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 357         }
 358         if (substream->pcm->device & 2)
 359                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
 360         if ((err = add_playback_constraints(runtime)) < 0) {
 361                 kfree(dpcm);
 362                 return err;
 363         }
 364
 365         return 0;
 366 }
 367
 368 static int snd_card_dummy_capture_open(struct snd_pcm_substream *substream)
 369 {
 370         struct snd_pcm_runtime *runtime = substream->runtime;
 371         struct snd_dummy_pcm *dpcm;
 372         int err;
 373
 374         if ((dpcm = new_pcm_stream(substream)) == NULL)
 375                 return -ENOMEM;
 376         runtime->private_data = dpcm;
 377         runtime->private_free = snd_card_dummy_runtime_free;
 378         runtime->hw = snd_card_dummy_capture;
 379         if (substream->pcm->device == 1) {
 380                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 381                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 382         }
 383         if (substream->pcm->device & 2)
 384                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
 385         if ((err = add_capture_constraints(runtime)) < 0) {
 386                 kfree(dpcm);
 387                 return err;
 388         }
 389
 390         return 0;
 391 }
 392
 393 static int snd_card_dummy_playback_close(struct snd_pcm_substream *substream)
 394 {
 395         return 0;
 396 }
 397
 398 static int snd_card_dummy_capture_close(struct snd_pcm_substream *substream)
 399 {
 400         return 0;
 401 }
 402
 403 static struct snd_pcm_ops snd_card_dummy_playback_ops = {
 404         .open =                 snd_card_dummy_playback_open,
 405         .close =                snd_card_dummy_playback_close,
 406         .ioctl =                snd_pcm_lib_ioctl,
 407         .hw_params =            snd_card_dummy_hw_params,
 408         .hw_free =              snd_card_dummy_hw_free,
 409         .prepare =              snd_card_dummy_pcm_prepare,
 410         .trigger =              snd_card_dummy_pcm_trigger,
 411         .pointer =              snd_card_dummy_pcm_pointer,
 412 };
 413
 414 static struct snd_pcm_ops snd_card_dummy_capture_ops = {
 415         .open =                 snd_card_dummy_capture_open,
 416         .close =                snd_card_dummy_capture_close,
 417         .ioctl =                snd_pcm_lib_ioctl,
 418         .hw_params =            snd_card_dummy_hw_params,
 419         .hw_free =              snd_card_dummy_hw_free,
 420         .prepare =              snd_card_dummy_pcm_prepare,
 421         .trigger =              snd_card_dummy_pcm_trigger,
 422         .pointer =              snd_card_dummy_pcm_pointer,
 423 };
 424
 425 static int __devinit snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
 426                                         int substreams)
 427 {
 428         struct snd_pcm *pcm;
 429         int err;
 430
 431         if ((err = snd_pcm_new(dummy->card, "Dummy PCM", device,
 432                                substreams, substreams, &pcm)) < 0)
 433                 return err;
 434         dummy->pcm = pcm;
 435         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_card_dummy_playback_ops);
 436         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_dummy_capture_ops);
 437         pcm->private_data = dummy;
 438         pcm->info_flags = 0;
 439         strcpy(pcm->name, "Dummy PCM");
 440         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
 441                                               snd_dma_continuous_data(GFP_KERNEL),
 442                                               0, 64*1024);
 443         return 0;
 444 }
 445
 446 #define DUMMY_VOLUME(xname, xindex, addr) \
 447 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
 448   .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
 449   .name = xname, .index = xindex, \
 450   .info = snd_dummy_volume_info, \
 451   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
 452   .private_value = addr, \
 453   .tlv = { .p = db_scale_dummy } }
 454
 455 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
 456                                  struct snd_ctl_elem_info *uinfo)
 457 {
 458         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 459         uinfo->count = 2;
 460         uinfo->value.integer.min = -50;
 461         uinfo->value.integer.max = 100;
 462         return 0;
 463 }
 464
 465 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
 466                                 struct snd_ctl_elem_value *ucontrol)
 467 {
 468         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 469         int addr = kcontrol->private_value;
 470
 471         spin_lock_irq(&dummy->mixer_lock);
 472         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
 473         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
 474         spin_unlock_irq(&dummy->mixer_lock);
 475         return 0;
 476 }
 477
 478 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
 479                                 struct snd_ctl_elem_value *ucontrol)
 480 {
 481         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 482         int change, addr = kcontrol->private_value;
 483         int left, right;
 484
 485         left = ucontrol->value.integer.value[0];
 486         if (left < -50)
 487                 left = -50;
 488         if (left > 100)
 489                 left = 100;
 490         right = ucontrol->value.integer.value[1];
 491         if (right < -50)
 492                 right = -50;
 493         if (right > 100)
 494                 right = 100;
 495         spin_lock_irq(&dummy->mixer_lock);
 496         change = dummy->mixer_volume[addr][0] != left ||
 497                  dummy->mixer_volume[addr][1] != right;
 498         dummy->mixer_volume[addr][0] = left;
 499         dummy->mixer_volume[addr][1] = right;
 500         spin_unlock_irq(&dummy->mixer_lock);
 501         return change;
 502 }
 503
 504 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
 505
 506 #define DUMMY_CAPSRC(xname, xindex, addr) \
 507 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 508   .info = snd_dummy_capsrc_info, \
 509   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
 510   .private_value = addr }
 511
 512 #define snd_dummy_capsrc_info   snd_ctl_boolean_stereo_info
 513
 514 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
 515                                 struct snd_ctl_elem_value *ucontrol)
 516 {
 517         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 518         int addr = kcontrol->private_value;
 519
 520         spin_lock_irq(&dummy->mixer_lock);
 521         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
 522         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
 523         spin_unlock_irq(&dummy->mixer_lock);
 524         return 0;
 525 }
 526
 527 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 528 {
 529         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 530         int change, addr = kcontrol->private_value;
 531         int left, right;
 532
 533         left = ucontrol->value.integer.value[0] & 1;
 534         right = ucontrol->value.integer.value[1] & 1;
 535         spin_lock_irq(&dummy->mixer_lock);
 536         change = dummy->capture_source[addr][0] != left &&
 537                  dummy->capture_source[addr][1] != right;
 538         dummy->capture_source[addr][0] = left;
 539         dummy->capture_source[addr][1] = right;
 540         spin_unlock_irq(&dummy->mixer_lock);
 541         return change;
 542 }
 543
 544 static struct snd_kcontrol_new snd_dummy_controls[] = {
 545 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
 546 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
 547 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
 548 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
 549 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
 550 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
 551 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
 552 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
 553 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
 554 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD)
 555 };
 556
 557 static int __devinit snd_card_dummy_new_mixer(struct snd_dummy *dummy)
 558 {
 559         struct snd_card *card = dummy->card;
 560         unsigned int idx;
 561         int err;
 562
 563         snd_assert(dummy != NULL, return -EINVAL);
 564         spin_lock_init(&dummy->mixer_lock);
 565         strcpy(card->mixername, "Dummy Mixer");
 566
 567         for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
 568                 if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy))) < 0)
 569                         return err;
 570         }
 571         return 0;
 572 }
 573
 574 static int __devinit snd_dummy_probe(struct platform_device *devptr)
 575 {
 576         struct snd_card *card;
 577         struct snd_dummy *dummy;
 578         int idx, err;
 579         int dev = devptr->id;
 580
 581         card = snd_card_new(index[dev], id[dev], THIS_MODULE,
 582                             sizeof(struct snd_dummy));
 583         if (card == NULL)
 584                 return -ENOMEM;
 585         dummy = card->private_data;
 586         dummy->card = card;
 587         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
 588                 if (pcm_substreams[dev] < 1)
 589                         pcm_substreams[dev] = 1;
 590                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
 591                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
 592                 if ((err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev])) < 0)
 593                         goto __nodev;
 594         }
 595         if ((err = snd_card_dummy_new_mixer(dummy)) < 0)
 596                 goto __nodev;
 597         strcpy(card->driver, "Dummy");
 598         strcpy(card->shortname, "Dummy");
 599         sprintf(card->longname, "Dummy %i", dev + 1);
 600
 601         snd_card_set_dev(card, &devptr->dev);
 602
 603         if ((err = snd_card_register(card)) == 0) {
 604                 platform_set_drvdata(devptr, card);
 605                 return 0;
 606         }
 607       __nodev:
 608         snd_card_free(card);
 609         return err;
 610 }
 611
 612 static int __devexit snd_dummy_remove(struct platform_device *devptr)
 613 {
 614         snd_card_free(platform_get_drvdata(devptr));
 615         platform_set_drvdata(devptr, NULL);
 616         return 0;
 617 }
 618
 619 #ifdef CONFIG_PM
 620 static int snd_dummy_suspend(struct platform_device *pdev, pm_message_t state)
 621 {
 622         struct snd_card *card = platform_get_drvdata(pdev);
 623         struct snd_dummy *dummy = card->private_data;
 624
 625         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
 626         snd_pcm_suspend_all(dummy->pcm);
 627         return 0;
 628 }
 629
 630 static int snd_dummy_resume(struct platform_device *pdev)
 631 {
 632         struct snd_card *card = platform_get_drvdata(pdev);
 633
 634         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
 635         return 0;
 636 }
 637 #endif
 638
 639 #define SND_DUMMY_DRIVER        "snd_dummy"
 640
 641 static struct platform_driver snd_dummy_driver = {
 642         .probe          = snd_dummy_probe,
 643         .remove         = __devexit_p(snd_dummy_remove),
 644 #ifdef CONFIG_PM
 645         .suspend        = snd_dummy_suspend,
 646         .resume         = snd_dummy_resume,
 647 #endif
 648         .driver         = {
 649                 .name   = SND_DUMMY_DRIVER
 650         },
 651 };
 652
 653 static void snd_dummy_unregister_all(void)
 654 {
 655         int i;
 656
 657         for (i = 0; i < ARRAY_SIZE(devices); ++i)
 658                 platform_device_unregister(devices[i]);
 659         platform_driver_unregister(&snd_dummy_driver);
 660 }
 661
 662 static int __init alsa_card_dummy_init(void)
 663 {
 664         int i, cards, err;
 665
 666         if ((err = platform_driver_register(&snd_dummy_driver)) < 0)
 667                 return err;
 668
 669         cards = 0;
 670         for (i = 0; i < SNDRV_CARDS; i++) {
 671                 struct platform_device *device;
 672                 if (! enable[i])
 673                         continue;
 674                 device = platform_device_register_simple(SND_DUMMY_DRIVER,
 675                                                          i, NULL, 0);
 676                 if (IS_ERR(device))
 677                         continue;
 678                 if (!platform_get_drvdata(device)) {
 679                         platform_device_unregister(device);
 680                         continue;
 681                 }
 682                 devices[i] = device;
 683                 cards++;
 684         }
 685         if (!cards) {
 686 #ifdef MODULE
 687                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
 688 #endif
 689                 snd_dummy_unregister_all();
 690                 return -ENODEV;
 691         }
 692         return 0;
 693 }
 694
 695 static void __exit alsa_card_dummy_exit(void)
 696 {
 697         snd_dummy_unregister_all();
 698 }
 699
 700 module_init(alsa_card_dummy_init)
 701 module_exit(alsa_card_dummy_exit)