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/tlv.h>
  33 #include <sound/pcm.h>
  34 #include <sound/rawmidi.h>
  35 #include <sound/initval.h>
  36
  37 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
  38 MODULE_DESCRIPTION("Dummy soundcard (/dev/null)");
  39 MODULE_LICENSE("GPL");
  40 MODULE_SUPPORTED_DEVICE("{{ALSA,Dummy soundcard}}");
  41
  42 #define MAX_PCM_DEVICES         4
  43 #define MAX_PCM_SUBSTREAMS      16
  44 #define MAX_MIDI_DEVICES        2
  45
  46 #if 0 /* emu10k1 emulation */
  47 #define MAX_BUFFER_SIZE         (128 * 1024)
  48 static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime)
  49 {
  50         int err;
  51         if ((err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
  52                 return err;
  53         if ((err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX)) < 0)
  54                 return err;
  55         return 0;
  56 }
  57 #define add_playback_constraints emu10k1_playback_constraints
  58 #endif
  59
  60 #if 0 /* RME9652 emulation */
  61 #define MAX_BUFFER_SIZE         (26 * 64 * 1024)
  62 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
  63 #define USE_CHANNELS_MIN        26
  64 #define USE_CHANNELS_MAX        26
  65 #define USE_PERIODS_MIN         2
  66 #define USE_PERIODS_MAX         2
  67 #endif
  68
  69 #if 0 /* ICE1712 emulation */
  70 #define MAX_BUFFER_SIZE         (256 * 1024)
  71 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
  72 #define USE_CHANNELS_MIN        10
  73 #define USE_CHANNELS_MAX        10
  74 #define USE_PERIODS_MIN         1
  75 #define USE_PERIODS_MAX         1024
  76 #endif
  77
  78 #if 0 /* UDA1341 emulation */
  79 #define MAX_BUFFER_SIZE         (16380)
  80 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
  81 #define USE_CHANNELS_MIN        2
  82 #define USE_CHANNELS_MAX        2
  83 #define USE_PERIODS_MIN         2
  84 #define USE_PERIODS_MAX         255
  85 #endif
  86
  87 #if 0 /* simple AC97 bridge (intel8x0) with 48kHz AC97 only codec */
  88 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
  89 #define USE_CHANNELS_MIN        2
  90 #define USE_CHANNELS_MAX        2
  91 #define USE_RATE                SNDRV_PCM_RATE_48000
  92 #define USE_RATE_MIN            48000
  93 #define USE_RATE_MAX            48000
  94 #endif
  95
  96 #if 0 /* CA0106 */
  97 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
  98 #define USE_CHANNELS_MIN        2
  99 #define USE_CHANNELS_MAX        2
 100 #define USE_RATE                (SNDRV_PCM_RATE_48000|SNDRV_PCM_RATE_96000|SNDRV_PCM_RATE_192000)
 101 #define USE_RATE_MIN            48000
 102 #define USE_RATE_MAX            192000
 103 #define MAX_BUFFER_SIZE         ((65536-64)*8)
 104 #define MAX_PERIOD_SIZE         (65536-64)
 105 #define USE_PERIODS_MIN         2
 106 #define USE_PERIODS_MAX         8
 107 #endif
 108
 109
 110 /* defaults */
 111 #ifndef MAX_BUFFER_SIZE
 112 #define MAX_BUFFER_SIZE         (64*1024)
 113 #endif
 114 #ifndef MAX_PERIOD_SIZE
 115 #define MAX_PERIOD_SIZE         MAX_BUFFER_SIZE
 116 #endif
 117 #ifndef USE_FORMATS
 118 #define USE_FORMATS             (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)
 119 #endif
 120 #ifndef USE_RATE
 121 #define USE_RATE                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000
 122 #define USE_RATE_MIN            5500
 123 #define USE_RATE_MAX            48000
 124 #endif
 125 #ifndef USE_CHANNELS_MIN
 126 #define USE_CHANNELS_MIN        1
 127 #endif
 128 #ifndef USE_CHANNELS_MAX
 129 #define USE_CHANNELS_MAX        2
 130 #endif
 131 #ifndef USE_PERIODS_MIN
 132 #define USE_PERIODS_MIN         1
 133 #endif
 134 #ifndef USE_PERIODS_MAX
 135 #define USE_PERIODS_MAX         1024
 136 #endif
 137 #ifndef add_playback_constraints
 138 #define add_playback_constraints(x) 0
 139 #endif
 140 #ifndef add_capture_constraints
 141 #define add_capture_constraints(x) 0
 142 #endif
 143
 144 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
 145 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
 146 static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
 147 static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
 148 static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
 149 //static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
 150
 151 module_param_array(index, int, NULL, 0444);
 152 MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
 153 module_param_array(id, charp, NULL, 0444);
 154 MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
 155 module_param_array(enable, bool, NULL, 0444);
 156 MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
 157 module_param_array(pcm_devs, int, NULL, 0444);
 158 MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
 159 module_param_array(pcm_substreams, int, NULL, 0444);
 160 MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-16) for dummy driver.");
 161 //module_param_array(midi_devs, int, NULL, 0444);
 162 //MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
 163
 164 static struct platform_device *devices[SNDRV_CARDS];
 165
 166 #define MIXER_ADDR_MASTER       0
 167 #define MIXER_ADDR_LINE         1
 168 #define MIXER_ADDR_MIC          2
 169 #define MIXER_ADDR_SYNTH        3
 170 #define MIXER_ADDR_CD           4
 171 #define MIXER_ADDR_LAST         4
 172
 173 struct snd_dummy {
 174         struct snd_card *card;
 175         struct snd_pcm *pcm;
 176         spinlock_t mixer_lock;
 177         int mixer_volume[MIXER_ADDR_LAST+1][2];
 178         int capture_source[MIXER_ADDR_LAST+1][2];
 179 };
 180
 181 struct snd_dummy_pcm {
 182         struct snd_dummy *dummy;
 183         spinlock_t lock;
 184         struct timer_list timer;
 185         unsigned int pcm_size;
 186         unsigned int pcm_count;
 187         unsigned int pcm_bps;           /* bytes per second */
 188         unsigned int pcm_jiffie;        /* bytes per one jiffie */
 189         unsigned int pcm_irq_pos;       /* IRQ position */
 190         unsigned int pcm_buf_pos;       /* position in buffer */
 191         struct snd_pcm_substream *substream;
 192 };
 193
 194
 195 static inline void snd_card_dummy_pcm_timer_start(struct snd_dummy_pcm *dpcm)
 196 {
 197         dpcm->timer.expires = 1 + jiffies;
 198         add_timer(&dpcm->timer);
 199 }
 200
 201 static inline void snd_card_dummy_pcm_timer_stop(struct snd_dummy_pcm *dpcm)
 202 {
 203         del_timer(&dpcm->timer);
 204 }
 205
 206 static int snd_card_dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 207 {
 208         struct snd_pcm_runtime *runtime = substream->runtime;
 209         struct snd_dummy_pcm *dpcm = runtime->private_data;
 210         int err = 0;
 211
 212         spin_lock(&dpcm->lock);
 213         switch (cmd) {
 214         case SNDRV_PCM_TRIGGER_START:
 215         case SNDRV_PCM_TRIGGER_RESUME:
 216                 snd_card_dummy_pcm_timer_start(dpcm);
 217                 break;
 218         case SNDRV_PCM_TRIGGER_STOP:
 219         case SNDRV_PCM_TRIGGER_SUSPEND:
 220                 snd_card_dummy_pcm_timer_stop(dpcm);
 221                 break;
 222         default:
 223                 err = -EINVAL;
 224                 break;
 225         }
 226         spin_unlock(&dpcm->lock);
 227         return 0;
 228 }
 229
 230 static int snd_card_dummy_pcm_prepare(struct snd_pcm_substream *substream)
 231 {
 232         struct snd_pcm_runtime *runtime = substream->runtime;
 233         struct snd_dummy_pcm *dpcm = runtime->private_data;
 234         unsigned int bps;
 235
 236         bps = runtime->rate * runtime->channels;
 237         bps *= snd_pcm_format_width(runtime->format);
 238         bps /= 8;
 239         if (bps <= 0)
 240                 return -EINVAL;
 241         dpcm->pcm_bps = bps;
 242         dpcm->pcm_jiffie = bps / HZ;
 243         dpcm->pcm_size = snd_pcm_lib_buffer_bytes(substream);
 244         dpcm->pcm_count = snd_pcm_lib_period_bytes(substream);
 245         dpcm->pcm_irq_pos = 0;
 246         dpcm->pcm_buf_pos = 0;
 247         return 0;
 248 }
 249
 250 static void snd_card_dummy_pcm_timer_function(unsigned long data)
 251 {
 252         struct snd_dummy_pcm *dpcm = (struct snd_dummy_pcm *)data;
 253         unsigned long flags;
 254
 255         spin_lock_irqsave(&dpcm->lock, flags);
 256         dpcm->timer.expires = 1 + jiffies;
 257         add_timer(&dpcm->timer);
 258         dpcm->pcm_irq_pos += dpcm->pcm_jiffie;
 259         dpcm->pcm_buf_pos += dpcm->pcm_jiffie;
 260         dpcm->pcm_buf_pos %= dpcm->pcm_size;
 261         if (dpcm->pcm_irq_pos >= dpcm->pcm_count) {
 262                 dpcm->pcm_irq_pos %= dpcm->pcm_count;
 263                 spin_unlock_irqrestore(&dpcm->lock, flags);
 264                 snd_pcm_period_elapsed(dpcm->substream);
 265         } else
 266                 spin_unlock_irqrestore(&dpcm->lock, flags);
 267 }
 268
 269 static snd_pcm_uframes_t snd_card_dummy_pcm_pointer(struct snd_pcm_substream *substream)
 270 {
 271         struct snd_pcm_runtime *runtime = substream->runtime;
 272         struct snd_dummy_pcm *dpcm = runtime->private_data;
 273
 274         return bytes_to_frames(runtime, dpcm->pcm_buf_pos);
 275 }
 276
 277 static struct snd_pcm_hardware snd_card_dummy_playback =
 278 {
 279         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 280                                  SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
 281         .formats =              USE_FORMATS,
 282         .rates =                USE_RATE,
 283         .rate_min =             USE_RATE_MIN,
 284         .rate_max =             USE_RATE_MAX,
 285         .channels_min =         USE_CHANNELS_MIN,
 286         .channels_max =         USE_CHANNELS_MAX,
 287         .buffer_bytes_max =     MAX_BUFFER_SIZE,
 288         .period_bytes_min =     64,
 289         .period_bytes_max =     MAX_PERIOD_SIZE,
 290         .periods_min =          USE_PERIODS_MIN,
 291         .periods_max =          USE_PERIODS_MAX,
 292         .fifo_size =            0,
 293 };
 294
 295 static struct snd_pcm_hardware snd_card_dummy_capture =
 296 {
 297         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 298                                  SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
 299         .formats =              USE_FORMATS,
 300         .rates =                USE_RATE,
 301         .rate_min =             USE_RATE_MIN,
 302         .rate_max =             USE_RATE_MAX,
 303         .channels_min =         USE_CHANNELS_MIN,
 304         .channels_max =         USE_CHANNELS_MAX,
 305         .buffer_bytes_max =     MAX_BUFFER_SIZE,
 306         .period_bytes_min =     64,
 307         .period_bytes_max =     MAX_PERIOD_SIZE,
 308         .periods_min =          USE_PERIODS_MIN,
 309         .periods_max =          USE_PERIODS_MAX,
 310         .fifo_size =            0,
 311 };
 312
 313 static void snd_card_dummy_runtime_free(struct snd_pcm_runtime *runtime)
 314 {
 315         kfree(runtime->private_data);
 316 }
 317
 318 static int snd_card_dummy_hw_params(struct snd_pcm_substream *substream,
 319                                     struct snd_pcm_hw_params *hw_params)
 320 {
 321         return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
 322 }
 323
 324 static int snd_card_dummy_hw_free(struct snd_pcm_substream *substream)
 325 {
 326         return snd_pcm_lib_free_pages(substream);
 327 }
 328
 329 static struct snd_dummy_pcm *new_pcm_stream(struct snd_pcm_substream *substream)
 330 {
 331         struct snd_dummy_pcm *dpcm;
 332
 333         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
 334         if (! dpcm)
 335                 return dpcm;
 336         init_timer(&dpcm->timer);
 337         dpcm->timer.data = (unsigned long) dpcm;
 338         dpcm->timer.function = snd_card_dummy_pcm_timer_function;
 339         spin_lock_init(&dpcm->lock);
 340         dpcm->substream = substream;
 341         return dpcm;
 342 }
 343
 344 static int snd_card_dummy_playback_open(struct snd_pcm_substream *substream)
 345 {
 346         struct snd_pcm_runtime *runtime = substream->runtime;
 347         struct snd_dummy_pcm *dpcm;
 348         int err;
 349
 350         if ((dpcm = new_pcm_stream(substream)) == NULL)
 351                 return -ENOMEM;
 352         runtime->private_data = dpcm;
 353         runtime->private_free = snd_card_dummy_runtime_free;
 354         runtime->hw = snd_card_dummy_playback;
 355         if (substream->pcm->device & 1) {
 356                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 357                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 358         }
 359         if (substream->pcm->device & 2)
 360                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
 361         if ((err = add_playback_constraints(runtime)) < 0) {
 362                 kfree(dpcm);
 363                 return err;
 364         }
 365
 366         return 0;
 367 }
 368
 369 static int snd_card_dummy_capture_open(struct snd_pcm_substream *substream)
 370 {
 371         struct snd_pcm_runtime *runtime = substream->runtime;
 372         struct snd_dummy_pcm *dpcm;
 373         int err;
 374
 375         if ((dpcm = new_pcm_stream(substream)) == NULL)
 376                 return -ENOMEM;
 377         runtime->private_data = dpcm;
 378         runtime->private_free = snd_card_dummy_runtime_free;
 379         runtime->hw = snd_card_dummy_capture;
 380         if (substream->pcm->device == 1) {
 381                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 382                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 383         }
 384         if (substream->pcm->device & 2)
 385                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
 386         if ((err = add_capture_constraints(runtime)) < 0) {
 387                 kfree(dpcm);
 388                 return err;
 389         }
 390
 391         return 0;
 392 }
 393
 394 static int snd_card_dummy_playback_close(struct snd_pcm_substream *substream)
 395 {
 396         return 0;
 397 }
 398
 399 static int snd_card_dummy_capture_close(struct snd_pcm_substream *substream)
 400 {
 401         return 0;
 402 }
 403
 404 static struct snd_pcm_ops snd_card_dummy_playback_ops = {
 405         .open =                 snd_card_dummy_playback_open,
 406         .close =                snd_card_dummy_playback_close,
 407         .ioctl =                snd_pcm_lib_ioctl,
 408         .hw_params =            snd_card_dummy_hw_params,
 409         .hw_free =              snd_card_dummy_hw_free,
 410         .prepare =              snd_card_dummy_pcm_prepare,
 411         .trigger =              snd_card_dummy_pcm_trigger,
 412         .pointer =              snd_card_dummy_pcm_pointer,
 413 };
 414
 415 static struct snd_pcm_ops snd_card_dummy_capture_ops = {
 416         .open =                 snd_card_dummy_capture_open,
 417         .close =                snd_card_dummy_capture_close,
 418         .ioctl =                snd_pcm_lib_ioctl,
 419         .hw_params =            snd_card_dummy_hw_params,
 420         .hw_free =              snd_card_dummy_hw_free,
 421         .prepare =              snd_card_dummy_pcm_prepare,
 422         .trigger =              snd_card_dummy_pcm_trigger,
 423         .pointer =              snd_card_dummy_pcm_pointer,
 424 };
 425
 426 static int __devinit snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
 427                                         int substreams)
 428 {
 429         struct snd_pcm *pcm;
 430         int err;
 431
 432         if ((err = snd_pcm_new(dummy->card, "Dummy PCM", device,
 433                                substreams, substreams, &pcm)) < 0)
 434                 return err;
 435         dummy->pcm = pcm;
 436         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_card_dummy_playback_ops);
 437         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_dummy_capture_ops);
 438         pcm->private_data = dummy;
 439         pcm->info_flags = 0;
 440         strcpy(pcm->name, "Dummy PCM");
 441         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
 442                                               snd_dma_continuous_data(GFP_KERNEL),
 443                                               0, 64*1024);
 444         return 0;
 445 }
 446
 447 #define DUMMY_VOLUME(xname, xindex, addr) \
 448 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
 449   .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
 450   .name = xname, .index = xindex, \
 451   .info = snd_dummy_volume_info, \
 452   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
 453   .private_value = addr, \
 454   .tlv = { .p = db_scale_dummy } }
 455
 456 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
 457                                  struct snd_ctl_elem_info *uinfo)
 458 {
 459         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 460         uinfo->count = 2;
 461         uinfo->value.integer.min = -50;
 462         uinfo->value.integer.max = 100;
 463         return 0;
 464 }
 465
 466 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
 467                                 struct snd_ctl_elem_value *ucontrol)
 468 {
 469         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 470         int addr = kcontrol->private_value;
 471
 472         spin_lock_irq(&dummy->mixer_lock);
 473         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
 474         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
 475         spin_unlock_irq(&dummy->mixer_lock);
 476         return 0;
 477 }
 478
 479 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
 480                                 struct snd_ctl_elem_value *ucontrol)
 481 {
 482         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 483         int change, addr = kcontrol->private_value;
 484         int left, right;
 485
 486         left = ucontrol->value.integer.value[0];
 487         if (left < -50)
 488                 left = -50;
 489         if (left > 100)
 490                 left = 100;
 491         right = ucontrol->value.integer.value[1];
 492         if (right < -50)
 493                 right = -50;
 494         if (right > 100)
 495                 right = 100;
 496         spin_lock_irq(&dummy->mixer_lock);
 497         change = dummy->mixer_volume[addr][0] != left ||
 498                  dummy->mixer_volume[addr][1] != right;
 499         dummy->mixer_volume[addr][0] = left;
 500         dummy->mixer_volume[addr][1] = right;
 501         spin_unlock_irq(&dummy->mixer_lock);
 502         return change;
 503 }
 504
 505 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
 506
 507 #define DUMMY_CAPSRC(xname, xindex, addr) \
 508 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 509   .info = snd_dummy_capsrc_info, \
 510   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
 511   .private_value = addr }
 512
 513 static int snd_dummy_capsrc_info(struct snd_kcontrol *kcontrol,
 514                                  struct snd_ctl_elem_info *uinfo)
 515 {
 516         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
 517         uinfo->count = 2;
 518         uinfo->value.integer.min = 0;
 519         uinfo->value.integer.max = 1;
 520         return 0;
 521 }
 522
 523 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
 524                                 struct snd_ctl_elem_value *ucontrol)
 525 {
 526         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 527         int addr = kcontrol->private_value;
 528
 529         spin_lock_irq(&dummy->mixer_lock);
 530         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
 531         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
 532         spin_unlock_irq(&dummy->mixer_lock);
 533         return 0;
 534 }
 535
 536 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 537 {
 538         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 539         int change, addr = kcontrol->private_value;
 540         int left, right;
 541
 542         left = ucontrol->value.integer.value[0] & 1;
 543         right = ucontrol->value.integer.value[1] & 1;
 544         spin_lock_irq(&dummy->mixer_lock);
 545         change = dummy->capture_source[addr][0] != left &&
 546                  dummy->capture_source[addr][1] != right;
 547         dummy->capture_source[addr][0] = left;
 548         dummy->capture_source[addr][1] = right;
 549         spin_unlock_irq(&dummy->mixer_lock);
 550         return change;
 551 }
 552
 553 static struct snd_kcontrol_new snd_dummy_controls[] = {
 554 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
 555 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
 556 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
 557 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
 558 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
 559 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
 560 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
 561 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
 562 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
 563 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD)
 564 };
 565
 566 static int __devinit snd_card_dummy_new_mixer(struct snd_dummy *dummy)
 567 {
 568         struct snd_card *card = dummy->card;
 569         unsigned int idx;
 570         int err;
 571
 572         snd_assert(dummy != NULL, 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                 if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy))) < 0)
 578                         return err;
 579         }
 580         return 0;
 581 }
 582
 583 static int __devinit snd_dummy_probe(struct platform_device *devptr)
 584 {
 585         struct snd_card *card;
 586         struct snd_dummy *dummy;
 587         int idx, err;
 588         int dev = devptr->id;
 589
 590         card = snd_card_new(index[dev], id[dev], THIS_MODULE,
 591                             sizeof(struct snd_dummy));
 592         if (card == NULL)
 593                 return -ENOMEM;
 594         dummy = card->private_data;
 595         dummy->card = card;
 596         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
 597                 if (pcm_substreams[dev] < 1)
 598                         pcm_substreams[dev] = 1;
 599                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
 600                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
 601                 if ((err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev])) < 0)
 602                         goto __nodev;
 603         }
 604         if ((err = snd_card_dummy_new_mixer(dummy)) < 0)
 605                 goto __nodev;
 606         strcpy(card->driver, "Dummy");
 607         strcpy(card->shortname, "Dummy");
 608         sprintf(card->longname, "Dummy %i", dev + 1);
 609
 610         snd_card_set_dev(card, &devptr->dev);
 611
 612         if ((err = snd_card_register(card)) == 0) {
 613                 platform_set_drvdata(devptr, card);
 614                 return 0;
 615         }
 616       __nodev:
 617         snd_card_free(card);
 618         return err;
 619 }
 620
 621 static int __devexit snd_dummy_remove(struct platform_device *devptr)
 622 {
 623         snd_card_free(platform_get_drvdata(devptr));
 624         platform_set_drvdata(devptr, NULL);
 625         return 0;
 626 }
 627
 628 #ifdef CONFIG_PM
 629 static int snd_dummy_suspend(struct platform_device *pdev, pm_message_t state)
 630 {
 631         struct snd_card *card = platform_get_drvdata(pdev);
 632         struct snd_dummy *dummy = card->private_data;
 633
 634         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
 635         snd_pcm_suspend_all(dummy->pcm);
 636         return 0;
 637 }
 638
 639 static int snd_dummy_resume(struct platform_device *pdev)
 640 {
 641         struct snd_card *card = platform_get_drvdata(pdev);
 642
 643         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
 644         return 0;
 645 }
 646 #endif
 647
 648 #define SND_DUMMY_DRIVER        "snd_dummy"
 649
 650 static struct platform_driver snd_dummy_driver = {
 651         .probe          = snd_dummy_probe,
 652         .remove         = __devexit_p(snd_dummy_remove),
 653 #ifdef CONFIG_PM
 654         .suspend        = snd_dummy_suspend,
 655         .resume         = snd_dummy_resume,
 656 #endif
 657         .driver         = {
 658                 .name   = SND_DUMMY_DRIVER
 659         },
 660 };
 661
 662 static void __init_or_module snd_dummy_unregister_all(void)
 663 {
 664         int i;
 665
 666         for (i = 0; i < ARRAY_SIZE(devices); ++i)
 667                 platform_device_unregister(devices[i]);
 668         platform_driver_unregister(&snd_dummy_driver);
 669 }
 670
 671 static int __init alsa_card_dummy_init(void)
 672 {
 673         int i, cards, err;
 674
 675         if ((err = platform_driver_register(&snd_dummy_driver)) < 0)
 676                 return err;
 677
 678         cards = 0;
 679         for (i = 0; i < SNDRV_CARDS; i++) {
 680                 struct platform_device *device;
 681                 if (! enable[i])
 682                         continue;
 683                 device = platform_device_register_simple(SND_DUMMY_DRIVER,
 684                                                          i, NULL, 0);
 685                 if (IS_ERR(device))
 686                         continue;
 687                 if (!platform_get_drvdata(device)) {
 688                         platform_device_unregister(device);
 689                         continue;
 690                 }
 691                 devices[i] = device;
 692                 cards++;
 693         }
 694         if (!cards) {
 695 #ifdef MODULE
 696                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
 697 #endif
 698                 snd_dummy_unregister_all();
 699                 return -ENODEV;
 700         }
 701         return 0;
 702 }
 703
 704 static void __exit alsa_card_dummy_exit(void)
 705 {
 706         snd_dummy_unregister_all();
 707 }
 708
 709 module_init(alsa_card_dummy_init)
 710 module_exit(alsa_card_dummy_exit)