sound/drivers/dummy.c

   1 /*
   2  *  Dummy soundcard
   3  *  Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h>
  22 #include <linux/init.h>
  23 #include <linux/err.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/jiffies.h>
  26 #include <linux/slab.h>
  27 #include <linux/time.h>
  28 #include <linux/wait.h>
  29 #include <linux/moduleparam.h>
  30 #include <sound/core.h>
  31 #include <sound/control.h>
  32 #include <sound/pcm.h>
  33 #include <sound/rawmidi.h>
  34 #include <sound/initval.h>
  35
  36 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.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_BUFFER_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 __init snd_card_dummy_pcm(struct snd_dummy *dummy, int device, int substreams)
 426 {
 427         struct snd_pcm *pcm;
 428         int err;
 429
 430         if ((err = snd_pcm_new(dummy->card, "Dummy PCM", device,
 431                                substreams, substreams, &pcm)) < 0)
 432                 return err;
 433         dummy->pcm = pcm;
 434         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_card_dummy_playback_ops);
 435         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_dummy_capture_ops);
 436         pcm->private_data = dummy;
 437         pcm->info_flags = 0;
 438         strcpy(pcm->name, "Dummy PCM");
 439         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
 440                                               snd_dma_continuous_data(GFP_KERNEL),
 441                                               0, 64*1024);
 442         return 0;
 443 }
 444
 445 #define DUMMY_VOLUME(xname, xindex, addr) \
 446 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 447   .info = snd_dummy_volume_info, \
 448   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
 449   .private_value = addr }
 450
 451 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
 452                                  struct snd_ctl_elem_info *uinfo)
 453 {
 454         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 455         uinfo->count = 2;
 456         uinfo->value.integer.min = -50;
 457         uinfo->value.integer.max = 100;
 458         return 0;
 459 }
 460
 461 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
 462                                 struct snd_ctl_elem_value *ucontrol)
 463 {
 464         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 465         int addr = kcontrol->private_value;
 466
 467         spin_lock_irq(&dummy->mixer_lock);
 468         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
 469         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
 470         spin_unlock_irq(&dummy->mixer_lock);
 471         return 0;
 472 }
 473
 474 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
 475                                 struct snd_ctl_elem_value *ucontrol)
 476 {
 477         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 478         int change, addr = kcontrol->private_value;
 479         int left, right;
 480
 481         left = ucontrol->value.integer.value[0];
 482         if (left < -50)
 483                 left = -50;
 484         if (left > 100)
 485                 left = 100;
 486         right = ucontrol->value.integer.value[1];
 487         if (right < -50)
 488                 right = -50;
 489         if (right > 100)
 490                 right = 100;
 491         spin_lock_irq(&dummy->mixer_lock);
 492         change = dummy->mixer_volume[addr][0] != left ||
 493                  dummy->mixer_volume[addr][1] != right;
 494         dummy->mixer_volume[addr][0] = left;
 495         dummy->mixer_volume[addr][1] = right;
 496         spin_unlock_irq(&dummy->mixer_lock);
 497         return change;
 498 }
 499
 500 #define DUMMY_CAPSRC(xname, xindex, addr) \
 501 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 502   .info = snd_dummy_capsrc_info, \
 503   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
 504   .private_value = addr }
 505
 506 static int snd_dummy_capsrc_info(struct snd_kcontrol *kcontrol,
 507                                  struct snd_ctl_elem_info *uinfo)
 508 {
 509         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
 510         uinfo->count = 2;
 511         uinfo->value.integer.min = 0;
 512         uinfo->value.integer.max = 1;
 513         return 0;
 514 }
 515
 516 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
 517                                 struct snd_ctl_elem_value *ucontrol)
 518 {
 519         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 520         int addr = kcontrol->private_value;
 521
 522         spin_lock_irq(&dummy->mixer_lock);
 523         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
 524         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
 525         spin_unlock_irq(&dummy->mixer_lock);
 526         return 0;
 527 }
 528
 529 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 530 {
 531         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 532         int change, addr = kcontrol->private_value;
 533         int left, right;
 534
 535         left = ucontrol->value.integer.value[0] & 1;
 536         right = ucontrol->value.integer.value[1] & 1;
 537         spin_lock_irq(&dummy->mixer_lock);
 538         change = dummy->capture_source[addr][0] != left &&
 539                  dummy->capture_source[addr][1] != right;
 540         dummy->capture_source[addr][0] = left;
 541         dummy->capture_source[addr][1] = right;
 542         spin_unlock_irq(&dummy->mixer_lock);
 543         return change;
 544 }
 545
 546 static struct snd_kcontrol_new snd_dummy_controls[] = {
 547 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
 548 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
 549 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
 550 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_MASTER),
 551 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
 552 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_MASTER),
 553 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
 554 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MASTER),
 555 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
 556 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_MASTER)
 557 };
 558
 559 static int __init snd_card_dummy_new_mixer(struct snd_dummy *dummy)
 560 {
 561         struct snd_card *card = dummy->card;
 562         unsigned int idx;
 563         int err;
 564
 565         snd_assert(dummy != NULL, return -EINVAL);
 566         spin_lock_init(&dummy->mixer_lock);
 567         strcpy(card->mixername, "Dummy Mixer");
 568
 569         for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
 570                 if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy))) < 0)
 571                         return err;
 572         }
 573         return 0;
 574 }
 575
 576 static int __init snd_dummy_probe(struct platform_device *devptr)
 577 {
 578         struct snd_card *card;
 579         struct snd_dummy *dummy;
 580         int idx, err;
 581         int dev = devptr->id;
 582
 583         card = snd_card_new(index[dev], id[dev], THIS_MODULE,
 584                             sizeof(struct snd_dummy));
 585         if (card == NULL)
 586                 return -ENOMEM;
 587         dummy = card->private_data;
 588         dummy->card = card;
 589         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
 590                 if (pcm_substreams[dev] < 1)
 591                         pcm_substreams[dev] = 1;
 592                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
 593                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
 594                 if ((err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev])) < 0)
 595                         goto __nodev;
 596         }
 597         if ((err = snd_card_dummy_new_mixer(dummy)) < 0)
 598                 goto __nodev;
 599         strcpy(card->driver, "Dummy");
 600         strcpy(card->shortname, "Dummy");
 601         sprintf(card->longname, "Dummy %i", dev + 1);
 602
 603         snd_card_set_dev(card, &devptr->dev);
 604
 605         if ((err = snd_card_register(card)) == 0) {
 606                 platform_set_drvdata(devptr, card);
 607                 return 0;
 608         }
 609       __nodev:
 610         snd_card_free(card);
 611         return err;
 612 }
 613
 614 static int snd_dummy_remove(struct platform_device *devptr)
 615 {
 616         snd_card_free(platform_get_drvdata(devptr));
 617         platform_set_drvdata(devptr, NULL);
 618         return 0;
 619 }
 620
 621 #ifdef CONFIG_PM
 622 static int snd_dummy_suspend(struct platform_device *pdev, pm_message_t state)
 623 {
 624         struct snd_card *card = platform_get_drvdata(pdev);
 625         struct snd_dummy *dummy = card->private_data;
 626
 627         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
 628         snd_pcm_suspend_all(dummy->pcm);
 629         return 0;
 630 }
 631
 632 static int snd_dummy_resume(struct platform_device *pdev)
 633 {
 634         struct snd_card *card = platform_get_drvdata(pdev);
 635
 636         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
 637         return 0;
 638 }
 639 #endif
 640
 641 #define SND_DUMMY_DRIVER        "snd_dummy"
 642
 643 static struct platform_driver snd_dummy_driver = {
 644         .probe          = snd_dummy_probe,
 645         .remove         = snd_dummy_remove,
 646 #ifdef CONFIG_PM
 647         .suspend        = snd_dummy_suspend,
 648         .resume         = snd_dummy_resume,
 649 #endif
 650         .driver         = {
 651                 .name   = SND_DUMMY_DRIVER
 652         },
 653 };
 654
 655 static void __init_or_module snd_dummy_unregister_all(void)
 656 {
 657         int i;
 658
 659         for (i = 0; i < ARRAY_SIZE(devices); ++i)
 660                 platform_device_unregister(devices[i]);
 661         platform_driver_unregister(&snd_dummy_driver);
 662 }
 663
 664 static int __init alsa_card_dummy_init(void)
 665 {
 666         int i, cards, err;
 667
 668         if ((err = platform_driver_register(&snd_dummy_driver)) < 0)
 669                 return err;
 670
 671         cards = 0;
 672         for (i = 0; i < SNDRV_CARDS; i++) {
 673                 struct platform_device *device;
 674                 if (! enable[i])
 675                         continue;
 676                 device = platform_device_register_simple(SND_DUMMY_DRIVER,
 677                                                          i, NULL, 0);
 678                 if (IS_ERR(device))
 679                         continue;
 680                 devices[i] = device;
 681                 cards++;
 682         }
 683         if (!cards) {
 684 #ifdef MODULE
 685                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
 686 #endif
 687                 snd_dummy_unregister_all();
 688                 return -ENODEV;
 689         }
 690         return 0;
 691 }
 692
 693 static void __exit alsa_card_dummy_exit(void)
 694 {
 695         snd_dummy_unregister_all();
 696 }
 697
 698 module_init(alsa_card_dummy_init)
 699 module_exit(alsa_card_dummy_exit)