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_buffer_size;
 185         unsigned int pcm_period_size;
 186         unsigned int pcm_bps;           /* bytes per second */
 187         unsigned int pcm_hz;            /* HZ */
 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         int bps;
 234
 235         bps = snd_pcm_format_width(runtime->format) * runtime->rate *
 236                 runtime->channels / 8;
 237
 238         if (bps <= 0)
 239                 return -EINVAL;
 240
 241         dpcm->pcm_bps = bps;
 242         dpcm->pcm_hz = HZ;
 243         dpcm->pcm_buffer_size = snd_pcm_lib_buffer_bytes(substream);
 244         dpcm->pcm_period_size = snd_pcm_lib_period_bytes(substream);
 245         dpcm->pcm_irq_pos = 0;
 246         dpcm->pcm_buf_pos = 0;
 247
 248         snd_pcm_format_set_silence(runtime->format, runtime->dma_area,
 249                         bytes_to_samples(runtime, runtime->dma_bytes));
 250
 251         return 0;
 252 }
 253
 254 static void snd_card_dummy_pcm_timer_function(unsigned long data)
 255 {
 256         struct snd_dummy_pcm *dpcm = (struct snd_dummy_pcm *)data;
 257         unsigned long flags;
 258
 259         spin_lock_irqsave(&dpcm->lock, flags);
 260         dpcm->timer.expires = 1 + jiffies;
 261         add_timer(&dpcm->timer);
 262         dpcm->pcm_irq_pos += dpcm->pcm_bps;
 263         dpcm->pcm_buf_pos += dpcm->pcm_bps;
 264         dpcm->pcm_buf_pos %= dpcm->pcm_buffer_size * dpcm->pcm_hz;
 265         if (dpcm->pcm_irq_pos >= dpcm->pcm_period_size * dpcm->pcm_hz) {
 266                 dpcm->pcm_irq_pos %= dpcm->pcm_period_size * dpcm->pcm_hz;
 267                 spin_unlock_irqrestore(&dpcm->lock, flags);
 268                 snd_pcm_period_elapsed(dpcm->substream);
 269         } else
 270                 spin_unlock_irqrestore(&dpcm->lock, flags);
 271 }
 272
 273 static snd_pcm_uframes_t snd_card_dummy_pcm_pointer(struct snd_pcm_substream *substream)
 274 {
 275         struct snd_pcm_runtime *runtime = substream->runtime;
 276         struct snd_dummy_pcm *dpcm = runtime->private_data;
 277
 278         return bytes_to_frames(runtime, dpcm->pcm_buf_pos / dpcm->pcm_hz);
 279 }
 280
 281 static struct snd_pcm_hardware snd_card_dummy_playback =
 282 {
 283         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 284                                  SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
 285         .formats =              USE_FORMATS,
 286         .rates =                USE_RATE,
 287         .rate_min =             USE_RATE_MIN,
 288         .rate_max =             USE_RATE_MAX,
 289         .channels_min =         USE_CHANNELS_MIN,
 290         .channels_max =         USE_CHANNELS_MAX,
 291         .buffer_bytes_max =     MAX_BUFFER_SIZE,
 292         .period_bytes_min =     64,
 293         .period_bytes_max =     MAX_PERIOD_SIZE,
 294         .periods_min =          USE_PERIODS_MIN,
 295         .periods_max =          USE_PERIODS_MAX,
 296         .fifo_size =            0,
 297 };
 298
 299 static struct snd_pcm_hardware snd_card_dummy_capture =
 300 {
 301         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 302                                  SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
 303         .formats =              USE_FORMATS,
 304         .rates =                USE_RATE,
 305         .rate_min =             USE_RATE_MIN,
 306         .rate_max =             USE_RATE_MAX,
 307         .channels_min =         USE_CHANNELS_MIN,
 308         .channels_max =         USE_CHANNELS_MAX,
 309         .buffer_bytes_max =     MAX_BUFFER_SIZE,
 310         .period_bytes_min =     64,
 311         .period_bytes_max =     MAX_PERIOD_SIZE,
 312         .periods_min =          USE_PERIODS_MIN,
 313         .periods_max =          USE_PERIODS_MAX,
 314         .fifo_size =            0,
 315 };
 316
 317 static void snd_card_dummy_runtime_free(struct snd_pcm_runtime *runtime)
 318 {
 319         kfree(runtime->private_data);
 320 }
 321
 322 static int snd_card_dummy_hw_params(struct snd_pcm_substream *substream,
 323                                     struct snd_pcm_hw_params *hw_params)
 324 {
 325         return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
 326 }
 327
 328 static int snd_card_dummy_hw_free(struct snd_pcm_substream *substream)
 329 {
 330         return snd_pcm_lib_free_pages(substream);
 331 }
 332
 333 static struct snd_dummy_pcm *new_pcm_stream(struct snd_pcm_substream *substream)
 334 {
 335         struct snd_dummy_pcm *dpcm;
 336
 337         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
 338         if (! dpcm)
 339                 return dpcm;
 340         init_timer(&dpcm->timer);
 341         dpcm->timer.data = (unsigned long) dpcm;
 342         dpcm->timer.function = snd_card_dummy_pcm_timer_function;
 343         spin_lock_init(&dpcm->lock);
 344         dpcm->substream = substream;
 345         return dpcm;
 346 }
 347
 348 static int snd_card_dummy_playback_open(struct snd_pcm_substream *substream)
 349 {
 350         struct snd_pcm_runtime *runtime = substream->runtime;
 351         struct snd_dummy_pcm *dpcm;
 352         int err;
 353
 354         if ((dpcm = new_pcm_stream(substream)) == NULL)
 355                 return -ENOMEM;
 356         runtime->private_data = dpcm;
 357         /* makes the infrastructure responsible for freeing dpcm */
 358         runtime->private_free = snd_card_dummy_runtime_free;
 359         runtime->hw = snd_card_dummy_playback;
 360         if (substream->pcm->device & 1) {
 361                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 362                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 363         }
 364         if (substream->pcm->device & 2)
 365                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
 366         if ((err = add_playback_constraints(runtime)) < 0)
 367                 return err;
 368
 369         return 0;
 370 }
 371
 372 static int snd_card_dummy_capture_open(struct snd_pcm_substream *substream)
 373 {
 374         struct snd_pcm_runtime *runtime = substream->runtime;
 375         struct snd_dummy_pcm *dpcm;
 376         int err;
 377
 378         if ((dpcm = new_pcm_stream(substream)) == NULL)
 379                 return -ENOMEM;
 380         runtime->private_data = dpcm;
 381         /* makes the infrastructure responsible for freeing dpcm */
 382         runtime->private_free = snd_card_dummy_runtime_free;
 383         runtime->hw = snd_card_dummy_capture;
 384         if (substream->pcm->device == 1) {
 385                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 386                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 387         }
 388         if (substream->pcm->device & 2)
 389                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
 390         if ((err = add_capture_constraints(runtime)) < 0)
 391                 return err;
 392
 393         return 0;
 394 }
 395
 396 static int snd_card_dummy_playback_close(struct snd_pcm_substream *substream)
 397 {
 398         return 0;
 399 }
 400
 401 static int snd_card_dummy_capture_close(struct snd_pcm_substream *substream)
 402 {
 403         return 0;
 404 }
 405
 406 static struct snd_pcm_ops snd_card_dummy_playback_ops = {
 407         .open =                 snd_card_dummy_playback_open,
 408         .close =                snd_card_dummy_playback_close,
 409         .ioctl =                snd_pcm_lib_ioctl,
 410         .hw_params =            snd_card_dummy_hw_params,
 411         .hw_free =              snd_card_dummy_hw_free,
 412         .prepare =              snd_card_dummy_pcm_prepare,
 413         .trigger =              snd_card_dummy_pcm_trigger,
 414         .pointer =              snd_card_dummy_pcm_pointer,
 415 };
 416
 417 static struct snd_pcm_ops snd_card_dummy_capture_ops = {
 418         .open =                 snd_card_dummy_capture_open,
 419         .close =                snd_card_dummy_capture_close,
 420         .ioctl =                snd_pcm_lib_ioctl,
 421         .hw_params =            snd_card_dummy_hw_params,
 422         .hw_free =              snd_card_dummy_hw_free,
 423         .prepare =              snd_card_dummy_pcm_prepare,
 424         .trigger =              snd_card_dummy_pcm_trigger,
 425         .pointer =              snd_card_dummy_pcm_pointer,
 426 };
 427
 428 static int __devinit snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
 429                                         int substreams)
 430 {
 431         struct snd_pcm *pcm;
 432         int err;
 433
 434         if ((err = snd_pcm_new(dummy->card, "Dummy PCM", device,
 435                                substreams, substreams, &pcm)) < 0)
 436                 return err;
 437         dummy->pcm = pcm;
 438         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_card_dummy_playback_ops);
 439         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_dummy_capture_ops);
 440         pcm->private_data = dummy;
 441         pcm->info_flags = 0;
 442         strcpy(pcm->name, "Dummy PCM");
 443         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
 444                                               snd_dma_continuous_data(GFP_KERNEL),
 445                                               0, 64*1024);
 446         return 0;
 447 }
 448
 449 #define DUMMY_VOLUME(xname, xindex, addr) \
 450 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
 451   .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
 452   .name = xname, .index = xindex, \
 453   .info = snd_dummy_volume_info, \
 454   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
 455   .private_value = addr, \
 456   .tlv = { .p = db_scale_dummy } }
 457
 458 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
 459                                  struct snd_ctl_elem_info *uinfo)
 460 {
 461         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 462         uinfo->count = 2;
 463         uinfo->value.integer.min = -50;
 464         uinfo->value.integer.max = 100;
 465         return 0;
 466 }
 467
 468 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
 469                                 struct snd_ctl_elem_value *ucontrol)
 470 {
 471         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 472         int addr = kcontrol->private_value;
 473
 474         spin_lock_irq(&dummy->mixer_lock);
 475         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
 476         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
 477         spin_unlock_irq(&dummy->mixer_lock);
 478         return 0;
 479 }
 480
 481 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
 482                                 struct snd_ctl_elem_value *ucontrol)
 483 {
 484         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 485         int change, addr = kcontrol->private_value;
 486         int left, right;
 487
 488         left = ucontrol->value.integer.value[0];
 489         if (left < -50)
 490                 left = -50;
 491         if (left > 100)
 492                 left = 100;
 493         right = ucontrol->value.integer.value[1];
 494         if (right < -50)
 495                 right = -50;
 496         if (right > 100)
 497                 right = 100;
 498         spin_lock_irq(&dummy->mixer_lock);
 499         change = dummy->mixer_volume[addr][0] != left ||
 500                  dummy->mixer_volume[addr][1] != right;
 501         dummy->mixer_volume[addr][0] = left;
 502         dummy->mixer_volume[addr][1] = right;
 503         spin_unlock_irq(&dummy->mixer_lock);
 504         return change;
 505 }
 506
 507 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
 508
 509 #define DUMMY_CAPSRC(xname, xindex, addr) \
 510 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 511   .info = snd_dummy_capsrc_info, \
 512   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
 513   .private_value = addr }
 514
 515 #define snd_dummy_capsrc_info   snd_ctl_boolean_stereo_info
 516
 517 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
 518                                 struct snd_ctl_elem_value *ucontrol)
 519 {
 520         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 521         int addr = kcontrol->private_value;
 522
 523         spin_lock_irq(&dummy->mixer_lock);
 524         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
 525         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
 526         spin_unlock_irq(&dummy->mixer_lock);
 527         return 0;
 528 }
 529
 530 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 531 {
 532         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 533         int change, addr = kcontrol->private_value;
 534         int left, right;
 535
 536         left = ucontrol->value.integer.value[0] & 1;
 537         right = ucontrol->value.integer.value[1] & 1;
 538         spin_lock_irq(&dummy->mixer_lock);
 539         change = dummy->capture_source[addr][0] != left &&
 540                  dummy->capture_source[addr][1] != right;
 541         dummy->capture_source[addr][0] = left;
 542         dummy->capture_source[addr][1] = right;
 543         spin_unlock_irq(&dummy->mixer_lock);
 544         return change;
 545 }
 546
 547 static struct snd_kcontrol_new snd_dummy_controls[] = {
 548 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
 549 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
 550 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
 551 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
 552 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
 553 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
 554 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
 555 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
 556 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
 557 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD)
 558 };
 559
 560 static int __devinit snd_card_dummy_new_mixer(struct snd_dummy *dummy)
 561 {
 562         struct snd_card *card = dummy->card;
 563         unsigned int idx;
 564         int err;
 565
 566         if (snd_BUG_ON(!dummy))
 567                 return -EINVAL;
 568         spin_lock_init(&dummy->mixer_lock);
 569         strcpy(card->mixername, "Dummy Mixer");
 570
 571         for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
 572                 if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy))) < 0)
 573                         return err;
 574         }
 575         return 0;
 576 }
 577
 578 static int __devinit snd_dummy_probe(struct platform_device *devptr)
 579 {
 580         struct snd_card *card;
 581         struct snd_dummy *dummy;
 582         int idx, err;
 583         int dev = devptr->id;
 584
 585         card = snd_card_new(index[dev], id[dev], THIS_MODULE,
 586                             sizeof(struct snd_dummy));
 587         if (card == NULL)
 588                 return -ENOMEM;
 589         dummy = card->private_data;
 590         dummy->card = card;
 591         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
 592                 if (pcm_substreams[dev] < 1)
 593                         pcm_substreams[dev] = 1;
 594                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
 595                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
 596                 if ((err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev])) < 0)
 597                         goto __nodev;
 598         }
 599         if ((err = snd_card_dummy_new_mixer(dummy)) < 0)
 600                 goto __nodev;
 601         strcpy(card->driver, "Dummy");
 602         strcpy(card->shortname, "Dummy");
 603         sprintf(card->longname, "Dummy %i", dev + 1);
 604
 605         snd_card_set_dev(card, &devptr->dev);
 606
 607         if ((err = snd_card_register(card)) == 0) {
 608                 platform_set_drvdata(devptr, card);
 609                 return 0;
 610         }
 611       __nodev:
 612         snd_card_free(card);
 613         return err;
 614 }
 615
 616 static int __devexit snd_dummy_remove(struct platform_device *devptr)
 617 {
 618         snd_card_free(platform_get_drvdata(devptr));
 619         platform_set_drvdata(devptr, NULL);
 620         return 0;
 621 }
 622
 623 #ifdef CONFIG_PM
 624 static int snd_dummy_suspend(struct platform_device *pdev, pm_message_t state)
 625 {
 626         struct snd_card *card = platform_get_drvdata(pdev);
 627         struct snd_dummy *dummy = card->private_data;
 628
 629         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
 630         snd_pcm_suspend_all(dummy->pcm);
 631         return 0;
 632 }
 633
 634 static int snd_dummy_resume(struct platform_device *pdev)
 635 {
 636         struct snd_card *card = platform_get_drvdata(pdev);
 637
 638         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
 639         return 0;
 640 }
 641 #endif
 642
 643 #define SND_DUMMY_DRIVER        "snd_dummy"
 644
 645 static struct platform_driver snd_dummy_driver = {
 646         .probe          = snd_dummy_probe,
 647         .remove         = __devexit_p(snd_dummy_remove),
 648 #ifdef CONFIG_PM
 649         .suspend        = snd_dummy_suspend,
 650         .resume         = snd_dummy_resume,
 651 #endif
 652         .driver         = {
 653                 .name   = SND_DUMMY_DRIVER
 654         },
 655 };
 656
 657 static void snd_dummy_unregister_all(void)
 658 {
 659         int i;
 660
 661         for (i = 0; i < ARRAY_SIZE(devices); ++i)
 662                 platform_device_unregister(devices[i]);
 663         platform_driver_unregister(&snd_dummy_driver);
 664 }
 665
 666 static int __init alsa_card_dummy_init(void)
 667 {
 668         int i, cards, err;
 669
 670         if ((err = platform_driver_register(&snd_dummy_driver)) < 0)
 671                 return err;
 672
 673         cards = 0;
 674         for (i = 0; i < SNDRV_CARDS; i++) {
 675                 struct platform_device *device;
 676                 if (! enable[i])
 677                         continue;
 678                 device = platform_device_register_simple(SND_DUMMY_DRIVER,
 679                                                          i, NULL, 0);
 680                 if (IS_ERR(device))
 681                         continue;
 682                 if (!platform_get_drvdata(device)) {
 683                         platform_device_unregister(device);
 684                         continue;
 685                 }
 686                 devices[i] = device;
 687                 cards++;
 688         }
 689         if (!cards) {
 690 #ifdef MODULE
 691                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
 692 #endif
 693                 snd_dummy_unregister_all();
 694                 return -ENODEV;
 695         }
 696         return 0;
 697 }
 698
 699 static void __exit alsa_card_dummy_exit(void)
 700 {
 701         snd_dummy_unregister_all();
 702 }
 703
 704 module_init(alsa_card_dummy_init)
 705 module_exit(alsa_card_dummy_exit)