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         err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
  51         if (err < 0)
  52                 return err;
  53         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX);
  54         if (err < 0)
  55                 return err;
  56         return 0;
  57 }
  58 #define add_playback_constraints emu10k1_playback_constraints
  59 #endif
  60
  61 #if 0 /* RME9652 emulation */
  62 #define MAX_BUFFER_SIZE         (26 * 64 * 1024)
  63 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
  64 #define USE_CHANNELS_MIN        26
  65 #define USE_CHANNELS_MAX        26
  66 #define USE_PERIODS_MIN         2
  67 #define USE_PERIODS_MAX         2
  68 #endif
  69
  70 #if 0 /* ICE1712 emulation */
  71 #define MAX_BUFFER_SIZE         (256 * 1024)
  72 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
  73 #define USE_CHANNELS_MIN        10
  74 #define USE_CHANNELS_MAX        10
  75 #define USE_PERIODS_MIN         1
  76 #define USE_PERIODS_MAX         1024
  77 #endif
  78
  79 #if 0 /* UDA1341 emulation */
  80 #define MAX_BUFFER_SIZE         (16380)
  81 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
  82 #define USE_CHANNELS_MIN        2
  83 #define USE_CHANNELS_MAX        2
  84 #define USE_PERIODS_MIN         2
  85 #define USE_PERIODS_MAX         255
  86 #endif
  87
  88 #if 0 /* simple AC97 bridge (intel8x0) with 48kHz AC97 only codec */
  89 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
  90 #define USE_CHANNELS_MIN        2
  91 #define USE_CHANNELS_MAX        2
  92 #define USE_RATE                SNDRV_PCM_RATE_48000
  93 #define USE_RATE_MIN            48000
  94 #define USE_RATE_MAX            48000
  95 #endif
  96
  97 #if 0 /* CA0106 */
  98 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
  99 #define USE_CHANNELS_MIN        2
 100 #define USE_CHANNELS_MAX        2
 101 #define USE_RATE                (SNDRV_PCM_RATE_48000|SNDRV_PCM_RATE_96000|SNDRV_PCM_RATE_192000)
 102 #define USE_RATE_MIN            48000
 103 #define USE_RATE_MAX            192000
 104 #define MAX_BUFFER_SIZE         ((65536-64)*8)
 105 #define MAX_PERIOD_SIZE         (65536-64)
 106 #define USE_PERIODS_MIN         2
 107 #define USE_PERIODS_MAX         8
 108 #endif
 109
 110
 111 /* defaults */
 112 #ifndef MAX_BUFFER_SIZE
 113 #define MAX_BUFFER_SIZE         (64*1024)
 114 #endif
 115 #ifndef MAX_PERIOD_SIZE
 116 #define MAX_PERIOD_SIZE         MAX_BUFFER_SIZE
 117 #endif
 118 #ifndef USE_FORMATS
 119 #define USE_FORMATS             (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)
 120 #endif
 121 #ifndef USE_RATE
 122 #define USE_RATE                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000
 123 #define USE_RATE_MIN            5500
 124 #define USE_RATE_MAX            48000
 125 #endif
 126 #ifndef USE_CHANNELS_MIN
 127 #define USE_CHANNELS_MIN        1
 128 #endif
 129 #ifndef USE_CHANNELS_MAX
 130 #define USE_CHANNELS_MAX        2
 131 #endif
 132 #ifndef USE_PERIODS_MIN
 133 #define USE_PERIODS_MIN         1
 134 #endif
 135 #ifndef USE_PERIODS_MAX
 136 #define USE_PERIODS_MAX         1024
 137 #endif
 138 #ifndef add_playback_constraints
 139 #define add_playback_constraints(x) 0
 140 #endif
 141 #ifndef add_capture_constraints
 142 #define add_capture_constraints(x) 0
 143 #endif
 144
 145 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
 146 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
 147 static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
 148 static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
 149 static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
 150 //static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
 151
 152 module_param_array(index, int, NULL, 0444);
 153 MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
 154 module_param_array(id, charp, NULL, 0444);
 155 MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
 156 module_param_array(enable, bool, NULL, 0444);
 157 MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
 158 module_param_array(pcm_devs, int, NULL, 0444);
 159 MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
 160 module_param_array(pcm_substreams, int, NULL, 0444);
 161 MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-16) for dummy driver.");
 162 //module_param_array(midi_devs, int, NULL, 0444);
 163 //MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
 164
 165 static struct platform_device *devices[SNDRV_CARDS];
 166
 167 #define MIXER_ADDR_MASTER       0
 168 #define MIXER_ADDR_LINE         1
 169 #define MIXER_ADDR_MIC          2
 170 #define MIXER_ADDR_SYNTH        3
 171 #define MIXER_ADDR_CD           4
 172 #define MIXER_ADDR_LAST         4
 173
 174 struct snd_dummy {
 175         struct snd_card *card;
 176         struct snd_pcm *pcm;
 177         spinlock_t mixer_lock;
 178         int mixer_volume[MIXER_ADDR_LAST+1][2];
 179         int capture_source[MIXER_ADDR_LAST+1][2];
 180 };
 181
 182 struct snd_dummy_pcm {
 183         struct snd_dummy *dummy;
 184         spinlock_t lock;
 185         struct timer_list timer;
 186         unsigned int pcm_buffer_size;
 187         unsigned int pcm_period_size;
 188         unsigned int pcm_bps;           /* bytes per second */
 189         unsigned int pcm_hz;            /* HZ */
 190         unsigned int pcm_irq_pos;       /* IRQ position */
 191         unsigned int pcm_buf_pos;       /* position in buffer */
 192         struct snd_pcm_substream *substream;
 193 };
 194
 195
 196 static inline void snd_card_dummy_pcm_timer_start(struct snd_dummy_pcm *dpcm)
 197 {
 198         dpcm->timer.expires = 1 + jiffies;
 199         add_timer(&dpcm->timer);
 200 }
 201
 202 static inline void snd_card_dummy_pcm_timer_stop(struct snd_dummy_pcm *dpcm)
 203 {
 204         del_timer(&dpcm->timer);
 205 }
 206
 207 static int snd_card_dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 208 {
 209         struct snd_pcm_runtime *runtime = substream->runtime;
 210         struct snd_dummy_pcm *dpcm = runtime->private_data;
 211         int err = 0;
 212
 213         spin_lock(&dpcm->lock);
 214         switch (cmd) {
 215         case SNDRV_PCM_TRIGGER_START:
 216         case SNDRV_PCM_TRIGGER_RESUME:
 217                 snd_card_dummy_pcm_timer_start(dpcm);
 218                 break;
 219         case SNDRV_PCM_TRIGGER_STOP:
 220         case SNDRV_PCM_TRIGGER_SUSPEND:
 221                 snd_card_dummy_pcm_timer_stop(dpcm);
 222                 break;
 223         default:
 224                 err = -EINVAL;
 225                 break;
 226         }
 227         spin_unlock(&dpcm->lock);
 228         return 0;
 229 }
 230
 231 static int snd_card_dummy_pcm_prepare(struct snd_pcm_substream *substream)
 232 {
 233         struct snd_pcm_runtime *runtime = substream->runtime;
 234         struct snd_dummy_pcm *dpcm = runtime->private_data;
 235         int bps;
 236
 237         bps = snd_pcm_format_width(runtime->format) * runtime->rate *
 238                 runtime->channels / 8;
 239
 240         if (bps <= 0)
 241                 return -EINVAL;
 242
 243         dpcm->pcm_bps = bps;
 244         dpcm->pcm_hz = HZ;
 245         dpcm->pcm_buffer_size = snd_pcm_lib_buffer_bytes(substream);
 246         dpcm->pcm_period_size = snd_pcm_lib_period_bytes(substream);
 247         dpcm->pcm_irq_pos = 0;
 248         dpcm->pcm_buf_pos = 0;
 249
 250         snd_pcm_format_set_silence(runtime->format, runtime->dma_area,
 251                         bytes_to_samples(runtime, runtime->dma_bytes));
 252
 253         return 0;
 254 }
 255
 256 static void snd_card_dummy_pcm_timer_function(unsigned long data)
 257 {
 258         struct snd_dummy_pcm *dpcm = (struct snd_dummy_pcm *)data;
 259         unsigned long flags;
 260
 261         spin_lock_irqsave(&dpcm->lock, flags);
 262         dpcm->timer.expires = 1 + jiffies;
 263         add_timer(&dpcm->timer);
 264         dpcm->pcm_irq_pos += dpcm->pcm_bps;
 265         dpcm->pcm_buf_pos += dpcm->pcm_bps;
 266         dpcm->pcm_buf_pos %= dpcm->pcm_buffer_size * dpcm->pcm_hz;
 267         if (dpcm->pcm_irq_pos >= dpcm->pcm_period_size * dpcm->pcm_hz) {
 268                 dpcm->pcm_irq_pos %= dpcm->pcm_period_size * dpcm->pcm_hz;
 269                 spin_unlock_irqrestore(&dpcm->lock, flags);
 270                 snd_pcm_period_elapsed(dpcm->substream);
 271         } else
 272                 spin_unlock_irqrestore(&dpcm->lock, flags);
 273 }
 274
 275 static snd_pcm_uframes_t snd_card_dummy_pcm_pointer(struct snd_pcm_substream *substream)
 276 {
 277         struct snd_pcm_runtime *runtime = substream->runtime;
 278         struct snd_dummy_pcm *dpcm = runtime->private_data;
 279
 280         return bytes_to_frames(runtime, dpcm->pcm_buf_pos / dpcm->pcm_hz);
 281 }
 282
 283 static struct snd_pcm_hardware snd_card_dummy_playback =
 284 {
 285         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 286                                  SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
 287         .formats =              USE_FORMATS,
 288         .rates =                USE_RATE,
 289         .rate_min =             USE_RATE_MIN,
 290         .rate_max =             USE_RATE_MAX,
 291         .channels_min =         USE_CHANNELS_MIN,
 292         .channels_max =         USE_CHANNELS_MAX,
 293         .buffer_bytes_max =     MAX_BUFFER_SIZE,
 294         .period_bytes_min =     64,
 295         .period_bytes_max =     MAX_PERIOD_SIZE,
 296         .periods_min =          USE_PERIODS_MIN,
 297         .periods_max =          USE_PERIODS_MAX,
 298         .fifo_size =            0,
 299 };
 300
 301 static struct snd_pcm_hardware snd_card_dummy_capture =
 302 {
 303         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 304                                  SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
 305         .formats =              USE_FORMATS,
 306         .rates =                USE_RATE,
 307         .rate_min =             USE_RATE_MIN,
 308         .rate_max =             USE_RATE_MAX,
 309         .channels_min =         USE_CHANNELS_MIN,
 310         .channels_max =         USE_CHANNELS_MAX,
 311         .buffer_bytes_max =     MAX_BUFFER_SIZE,
 312         .period_bytes_min =     64,
 313         .period_bytes_max =     MAX_PERIOD_SIZE,
 314         .periods_min =          USE_PERIODS_MIN,
 315         .periods_max =          USE_PERIODS_MAX,
 316         .fifo_size =            0,
 317 };
 318
 319 static void snd_card_dummy_runtime_free(struct snd_pcm_runtime *runtime)
 320 {
 321         kfree(runtime->private_data);
 322 }
 323
 324 static int snd_card_dummy_hw_params(struct snd_pcm_substream *substream,
 325                                     struct snd_pcm_hw_params *hw_params)
 326 {
 327         return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
 328 }
 329
 330 static int snd_card_dummy_hw_free(struct snd_pcm_substream *substream)
 331 {
 332         return snd_pcm_lib_free_pages(substream);
 333 }
 334
 335 static struct snd_dummy_pcm *new_pcm_stream(struct snd_pcm_substream *substream)
 336 {
 337         struct snd_dummy_pcm *dpcm;
 338
 339         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
 340         if (! dpcm)
 341                 return dpcm;
 342         init_timer(&dpcm->timer);
 343         dpcm->timer.data = (unsigned long) dpcm;
 344         dpcm->timer.function = snd_card_dummy_pcm_timer_function;
 345         spin_lock_init(&dpcm->lock);
 346         dpcm->substream = substream;
 347         return dpcm;
 348 }
 349
 350 static int snd_card_dummy_playback_open(struct snd_pcm_substream *substream)
 351 {
 352         struct snd_pcm_runtime *runtime = substream->runtime;
 353         struct snd_dummy_pcm *dpcm;
 354         int err;
 355
 356         if ((dpcm = new_pcm_stream(substream)) == NULL)
 357                 return -ENOMEM;
 358         runtime->private_data = dpcm;
 359         /* makes the infrastructure responsible for freeing dpcm */
 360         runtime->private_free = snd_card_dummy_runtime_free;
 361         runtime->hw = snd_card_dummy_playback;
 362         if (substream->pcm->device & 1) {
 363                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 364                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 365         }
 366         if (substream->pcm->device & 2)
 367                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
 368         err = add_playback_constraints(runtime);
 369         if (err < 0)
 370                 return err;
 371
 372         return 0;
 373 }
 374
 375 static int snd_card_dummy_capture_open(struct snd_pcm_substream *substream)
 376 {
 377         struct snd_pcm_runtime *runtime = substream->runtime;
 378         struct snd_dummy_pcm *dpcm;
 379         int err;
 380
 381         if ((dpcm = new_pcm_stream(substream)) == NULL)
 382                 return -ENOMEM;
 383         runtime->private_data = dpcm;
 384         /* makes the infrastructure responsible for freeing dpcm */
 385         runtime->private_free = snd_card_dummy_runtime_free;
 386         runtime->hw = snd_card_dummy_capture;
 387         if (substream->pcm->device == 1) {
 388                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 389                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 390         }
 391         if (substream->pcm->device & 2)
 392                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
 393         err = add_capture_constraints(runtime);
 394         if (err < 0)
 395                 return err;
 396
 397         return 0;
 398 }
 399
 400 static int snd_card_dummy_playback_close(struct snd_pcm_substream *substream)
 401 {
 402         return 0;
 403 }
 404
 405 static int snd_card_dummy_capture_close(struct snd_pcm_substream *substream)
 406 {
 407         return 0;
 408 }
 409
 410 static struct snd_pcm_ops snd_card_dummy_playback_ops = {
 411         .open =                 snd_card_dummy_playback_open,
 412         .close =                snd_card_dummy_playback_close,
 413         .ioctl =                snd_pcm_lib_ioctl,
 414         .hw_params =            snd_card_dummy_hw_params,
 415         .hw_free =              snd_card_dummy_hw_free,
 416         .prepare =              snd_card_dummy_pcm_prepare,
 417         .trigger =              snd_card_dummy_pcm_trigger,
 418         .pointer =              snd_card_dummy_pcm_pointer,
 419 };
 420
 421 static struct snd_pcm_ops snd_card_dummy_capture_ops = {
 422         .open =                 snd_card_dummy_capture_open,
 423         .close =                snd_card_dummy_capture_close,
 424         .ioctl =                snd_pcm_lib_ioctl,
 425         .hw_params =            snd_card_dummy_hw_params,
 426         .hw_free =              snd_card_dummy_hw_free,
 427         .prepare =              snd_card_dummy_pcm_prepare,
 428         .trigger =              snd_card_dummy_pcm_trigger,
 429         .pointer =              snd_card_dummy_pcm_pointer,
 430 };
 431
 432 static int __devinit snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
 433                                         int substreams)
 434 {
 435         struct snd_pcm *pcm;
 436         int err;
 437
 438         err = snd_pcm_new(dummy->card, "Dummy PCM", device,
 439                                substreams, substreams, &pcm);
 440         if (err < 0)
 441                 return err;
 442         dummy->pcm = pcm;
 443         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_card_dummy_playback_ops);
 444         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_dummy_capture_ops);
 445         pcm->private_data = dummy;
 446         pcm->info_flags = 0;
 447         strcpy(pcm->name, "Dummy PCM");
 448         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
 449                                               snd_dma_continuous_data(GFP_KERNEL),
 450                                               0, 64*1024);
 451         return 0;
 452 }
 453
 454 #define DUMMY_VOLUME(xname, xindex, addr) \
 455 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
 456   .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
 457   .name = xname, .index = xindex, \
 458   .info = snd_dummy_volume_info, \
 459   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
 460   .private_value = addr, \
 461   .tlv = { .p = db_scale_dummy } }
 462
 463 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
 464                                  struct snd_ctl_elem_info *uinfo)
 465 {
 466         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 467         uinfo->count = 2;
 468         uinfo->value.integer.min = -50;
 469         uinfo->value.integer.max = 100;
 470         return 0;
 471 }
 472
 473 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
 474                                 struct snd_ctl_elem_value *ucontrol)
 475 {
 476         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 477         int addr = kcontrol->private_value;
 478
 479         spin_lock_irq(&dummy->mixer_lock);
 480         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
 481         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
 482         spin_unlock_irq(&dummy->mixer_lock);
 483         return 0;
 484 }
 485
 486 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
 487                                 struct snd_ctl_elem_value *ucontrol)
 488 {
 489         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 490         int change, addr = kcontrol->private_value;
 491         int left, right;
 492
 493         left = ucontrol->value.integer.value[0];
 494         if (left < -50)
 495                 left = -50;
 496         if (left > 100)
 497                 left = 100;
 498         right = ucontrol->value.integer.value[1];
 499         if (right < -50)
 500                 right = -50;
 501         if (right > 100)
 502                 right = 100;
 503         spin_lock_irq(&dummy->mixer_lock);
 504         change = dummy->mixer_volume[addr][0] != left ||
 505                  dummy->mixer_volume[addr][1] != right;
 506         dummy->mixer_volume[addr][0] = left;
 507         dummy->mixer_volume[addr][1] = right;
 508         spin_unlock_irq(&dummy->mixer_lock);
 509         return change;
 510 }
 511
 512 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
 513
 514 #define DUMMY_CAPSRC(xname, xindex, addr) \
 515 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 516   .info = snd_dummy_capsrc_info, \
 517   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
 518   .private_value = addr }
 519
 520 #define snd_dummy_capsrc_info   snd_ctl_boolean_stereo_info
 521
 522 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
 523                                 struct snd_ctl_elem_value *ucontrol)
 524 {
 525         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 526         int addr = kcontrol->private_value;
 527
 528         spin_lock_irq(&dummy->mixer_lock);
 529         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
 530         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
 531         spin_unlock_irq(&dummy->mixer_lock);
 532         return 0;
 533 }
 534
 535 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 536 {
 537         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 538         int change, addr = kcontrol->private_value;
 539         int left, right;
 540
 541         left = ucontrol->value.integer.value[0] & 1;
 542         right = ucontrol->value.integer.value[1] & 1;
 543         spin_lock_irq(&dummy->mixer_lock);
 544         change = dummy->capture_source[addr][0] != left &&
 545                  dummy->capture_source[addr][1] != right;
 546         dummy->capture_source[addr][0] = left;
 547         dummy->capture_source[addr][1] = right;
 548         spin_unlock_irq(&dummy->mixer_lock);
 549         return change;
 550 }
 551
 552 static struct snd_kcontrol_new snd_dummy_controls[] = {
 553 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
 554 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
 555 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
 556 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
 557 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
 558 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
 559 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
 560 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
 561 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
 562 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD)
 563 };
 564
 565 static int __devinit snd_card_dummy_new_mixer(struct snd_dummy *dummy)
 566 {
 567         struct snd_card *card = dummy->card;
 568         unsigned int idx;
 569         int err;
 570
 571         if (snd_BUG_ON(!dummy))
 572                 return -EINVAL;
 573         spin_lock_init(&dummy->mixer_lock);
 574         strcpy(card->mixername, "Dummy Mixer");
 575
 576         for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
 577                 err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy));
 578                 if (err < 0)
 579                         return err;
 580         }
 581         return 0;
 582 }
 583
 584 static int __devinit snd_dummy_probe(struct platform_device *devptr)
 585 {
 586         struct snd_card *card;
 587         struct snd_dummy *dummy;
 588         int idx, err;
 589         int dev = devptr->id;
 590
 591         card = snd_card_new(index[dev], id[dev], THIS_MODULE,
 592                             sizeof(struct snd_dummy));
 593         if (card == NULL)
 594                 return -ENOMEM;
 595         dummy = card->private_data;
 596         dummy->card = card;
 597         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
 598                 if (pcm_substreams[dev] < 1)
 599                         pcm_substreams[dev] = 1;
 600                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
 601                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
 602                 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
 603                 if (err < 0)
 604                         goto __nodev;
 605         }
 606         err = snd_card_dummy_new_mixer(dummy);
 607         if (err < 0)
 608                 goto __nodev;
 609         strcpy(card->driver, "Dummy");
 610         strcpy(card->shortname, "Dummy");
 611         sprintf(card->longname, "Dummy %i", dev + 1);
 612
 613         snd_card_set_dev(card, &devptr->dev);
 614
 615         err = snd_card_register(card);
 616         if (err == 0) {
 617                 platform_set_drvdata(devptr, card);
 618                 return 0;
 619         }
 620       __nodev:
 621         snd_card_free(card);
 622         return err;
 623 }
 624
 625 static int __devexit snd_dummy_remove(struct platform_device *devptr)
 626 {
 627         snd_card_free(platform_get_drvdata(devptr));
 628         platform_set_drvdata(devptr, NULL);
 629         return 0;
 630 }
 631
 632 #ifdef CONFIG_PM
 633 static int snd_dummy_suspend(struct platform_device *pdev, pm_message_t state)
 634 {
 635         struct snd_card *card = platform_get_drvdata(pdev);
 636         struct snd_dummy *dummy = card->private_data;
 637
 638         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
 639         snd_pcm_suspend_all(dummy->pcm);
 640         return 0;
 641 }
 642
 643 static int snd_dummy_resume(struct platform_device *pdev)
 644 {
 645         struct snd_card *card = platform_get_drvdata(pdev);
 646
 647         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
 648         return 0;
 649 }
 650 #endif
 651
 652 #define SND_DUMMY_DRIVER        "snd_dummy"
 653
 654 static struct platform_driver snd_dummy_driver = {
 655         .probe          = snd_dummy_probe,
 656         .remove         = __devexit_p(snd_dummy_remove),
 657 #ifdef CONFIG_PM
 658         .suspend        = snd_dummy_suspend,
 659         .resume         = snd_dummy_resume,
 660 #endif
 661         .driver         = {
 662                 .name   = SND_DUMMY_DRIVER
 663         },
 664 };
 665
 666 static void snd_dummy_unregister_all(void)
 667 {
 668         int i;
 669
 670         for (i = 0; i < ARRAY_SIZE(devices); ++i)
 671                 platform_device_unregister(devices[i]);
 672         platform_driver_unregister(&snd_dummy_driver);
 673 }
 674
 675 static int __init alsa_card_dummy_init(void)
 676 {
 677         int i, cards, err;
 678
 679         err = platform_driver_register(&snd_dummy_driver);
 680         if (err < 0)
 681                 return err;
 682
 683         cards = 0;
 684         for (i = 0; i < SNDRV_CARDS; i++) {
 685                 struct platform_device *device;
 686                 if (! enable[i])
 687                         continue;
 688                 device = platform_device_register_simple(SND_DUMMY_DRIVER,
 689                                                          i, NULL, 0);
 690                 if (IS_ERR(device))
 691                         continue;
 692                 if (!platform_get_drvdata(device)) {
 693                         platform_device_unregister(device);
 694                         continue;
 695                 }
 696                 devices[i] = device;
 697                 cards++;
 698         }
 699         if (!cards) {
 700 #ifdef MODULE
 701                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
 702 #endif
 703                 snd_dummy_unregister_all();
 704                 return -ENODEV;
 705         }
 706         return 0;
 707 }
 708
 709 static void __exit alsa_card_dummy_exit(void)
 710 {
 711         snd_dummy_unregister_all();
 712 }
 713
 714 module_init(alsa_card_dummy_init)
 715 module_exit(alsa_card_dummy_exit)