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         runtime->private_free = snd_card_dummy_runtime_free;
 358         runtime->hw = snd_card_dummy_playback;
 359         if (substream->pcm->device & 1) {
 360                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 361                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 362         }
 363         if (substream->pcm->device & 2)
 364                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
 365         if ((err = add_playback_constraints(runtime)) < 0) {
 366                 kfree(dpcm);
 367                 return err;
 368         }
 369
 370         return 0;
 371 }
 372
 373 static int snd_card_dummy_capture_open(struct snd_pcm_substream *substream)
 374 {
 375         struct snd_pcm_runtime *runtime = substream->runtime;
 376         struct snd_dummy_pcm *dpcm;
 377         int err;
 378
 379         if ((dpcm = new_pcm_stream(substream)) == NULL)
 380                 return -ENOMEM;
 381         runtime->private_data = 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                 kfree(dpcm);
 392                 return err;
 393         }
 394
 395         return 0;
 396 }
 397
 398 static int snd_card_dummy_playback_close(struct snd_pcm_substream *substream)
 399 {
 400         return 0;
 401 }
 402
 403 static int snd_card_dummy_capture_close(struct snd_pcm_substream *substream)
 404 {
 405         return 0;
 406 }
 407
 408 static struct snd_pcm_ops snd_card_dummy_playback_ops = {
 409         .open =                 snd_card_dummy_playback_open,
 410         .close =                snd_card_dummy_playback_close,
 411         .ioctl =                snd_pcm_lib_ioctl,
 412         .hw_params =            snd_card_dummy_hw_params,
 413         .hw_free =              snd_card_dummy_hw_free,
 414         .prepare =              snd_card_dummy_pcm_prepare,
 415         .trigger =              snd_card_dummy_pcm_trigger,
 416         .pointer =              snd_card_dummy_pcm_pointer,
 417 };
 418
 419 static struct snd_pcm_ops snd_card_dummy_capture_ops = {
 420         .open =                 snd_card_dummy_capture_open,
 421         .close =                snd_card_dummy_capture_close,
 422         .ioctl =                snd_pcm_lib_ioctl,
 423         .hw_params =            snd_card_dummy_hw_params,
 424         .hw_free =              snd_card_dummy_hw_free,
 425         .prepare =              snd_card_dummy_pcm_prepare,
 426         .trigger =              snd_card_dummy_pcm_trigger,
 427         .pointer =              snd_card_dummy_pcm_pointer,
 428 };
 429
 430 static int __devinit snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
 431                                         int substreams)
 432 {
 433         struct snd_pcm *pcm;
 434         int err;
 435
 436         if ((err = snd_pcm_new(dummy->card, "Dummy PCM", device,
 437                                substreams, substreams, &pcm)) < 0)
 438                 return err;
 439         dummy->pcm = pcm;
 440         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_card_dummy_playback_ops);
 441         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_dummy_capture_ops);
 442         pcm->private_data = dummy;
 443         pcm->info_flags = 0;
 444         strcpy(pcm->name, "Dummy PCM");
 445         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
 446                                               snd_dma_continuous_data(GFP_KERNEL),
 447                                               0, 64*1024);
 448         return 0;
 449 }
 450
 451 #define DUMMY_VOLUME(xname, xindex, addr) \
 452 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
 453   .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
 454   .name = xname, .index = xindex, \
 455   .info = snd_dummy_volume_info, \
 456   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
 457   .private_value = addr, \
 458   .tlv = { .p = db_scale_dummy } }
 459
 460 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
 461                                  struct snd_ctl_elem_info *uinfo)
 462 {
 463         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 464         uinfo->count = 2;
 465         uinfo->value.integer.min = -50;
 466         uinfo->value.integer.max = 100;
 467         return 0;
 468 }
 469
 470 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
 471                                 struct snd_ctl_elem_value *ucontrol)
 472 {
 473         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 474         int addr = kcontrol->private_value;
 475
 476         spin_lock_irq(&dummy->mixer_lock);
 477         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
 478         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
 479         spin_unlock_irq(&dummy->mixer_lock);
 480         return 0;
 481 }
 482
 483 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
 484                                 struct snd_ctl_elem_value *ucontrol)
 485 {
 486         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 487         int change, addr = kcontrol->private_value;
 488         int left, right;
 489
 490         left = ucontrol->value.integer.value[0];
 491         if (left < -50)
 492                 left = -50;
 493         if (left > 100)
 494                 left = 100;
 495         right = ucontrol->value.integer.value[1];
 496         if (right < -50)
 497                 right = -50;
 498         if (right > 100)
 499                 right = 100;
 500         spin_lock_irq(&dummy->mixer_lock);
 501         change = dummy->mixer_volume[addr][0] != left ||
 502                  dummy->mixer_volume[addr][1] != right;
 503         dummy->mixer_volume[addr][0] = left;
 504         dummy->mixer_volume[addr][1] = right;
 505         spin_unlock_irq(&dummy->mixer_lock);
 506         return change;
 507 }
 508
 509 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
 510
 511 #define DUMMY_CAPSRC(xname, xindex, addr) \
 512 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 513   .info = snd_dummy_capsrc_info, \
 514   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
 515   .private_value = addr }
 516
 517 #define snd_dummy_capsrc_info   snd_ctl_boolean_stereo_info
 518
 519 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
 520                                 struct snd_ctl_elem_value *ucontrol)
 521 {
 522         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 523         int addr = kcontrol->private_value;
 524
 525         spin_lock_irq(&dummy->mixer_lock);
 526         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
 527         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
 528         spin_unlock_irq(&dummy->mixer_lock);
 529         return 0;
 530 }
 531
 532 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 533 {
 534         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 535         int change, addr = kcontrol->private_value;
 536         int left, right;
 537
 538         left = ucontrol->value.integer.value[0] & 1;
 539         right = ucontrol->value.integer.value[1] & 1;
 540         spin_lock_irq(&dummy->mixer_lock);
 541         change = dummy->capture_source[addr][0] != left &&
 542                  dummy->capture_source[addr][1] != right;
 543         dummy->capture_source[addr][0] = left;
 544         dummy->capture_source[addr][1] = right;
 545         spin_unlock_irq(&dummy->mixer_lock);
 546         return change;
 547 }
 548
 549 static struct snd_kcontrol_new snd_dummy_controls[] = {
 550 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
 551 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
 552 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
 553 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
 554 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
 555 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
 556 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
 557 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
 558 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
 559 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD)
 560 };
 561
 562 static int __devinit snd_card_dummy_new_mixer(struct snd_dummy *dummy)
 563 {
 564         struct snd_card *card = dummy->card;
 565         unsigned int idx;
 566         int err;
 567
 568         snd_assert(dummy != NULL, return -EINVAL);
 569         spin_lock_init(&dummy->mixer_lock);
 570         strcpy(card->mixername, "Dummy Mixer");
 571
 572         for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
 573                 if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy))) < 0)
 574                         return err;
 575         }
 576         return 0;
 577 }
 578
 579 static int __devinit snd_dummy_probe(struct platform_device *devptr)
 580 {
 581         struct snd_card *card;
 582         struct snd_dummy *dummy;
 583         int idx, err;
 584         int dev = devptr->id;
 585
 586         card = snd_card_new(index[dev], id[dev], THIS_MODULE,
 587                             sizeof(struct snd_dummy));
 588         if (card == NULL)
 589                 return -ENOMEM;
 590         dummy = card->private_data;
 591         dummy->card = card;
 592         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
 593                 if (pcm_substreams[dev] < 1)
 594                         pcm_substreams[dev] = 1;
 595                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
 596                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
 597                 if ((err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev])) < 0)
 598                         goto __nodev;
 599         }
 600         if ((err = snd_card_dummy_new_mixer(dummy)) < 0)
 601                 goto __nodev;
 602         strcpy(card->driver, "Dummy");
 603         strcpy(card->shortname, "Dummy");
 604         sprintf(card->longname, "Dummy %i", dev + 1);
 605
 606         snd_card_set_dev(card, &devptr->dev);
 607
 608         if ((err = snd_card_register(card)) == 0) {
 609                 platform_set_drvdata(devptr, card);
 610                 return 0;
 611         }
 612       __nodev:
 613         snd_card_free(card);
 614         return err;
 615 }
 616
 617 static int __devexit snd_dummy_remove(struct platform_device *devptr)
 618 {
 619         snd_card_free(platform_get_drvdata(devptr));
 620         platform_set_drvdata(devptr, NULL);
 621         return 0;
 622 }
 623
 624 #ifdef CONFIG_PM
 625 static int snd_dummy_suspend(struct platform_device *pdev, pm_message_t state)
 626 {
 627         struct snd_card *card = platform_get_drvdata(pdev);
 628         struct snd_dummy *dummy = card->private_data;
 629
 630         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
 631         snd_pcm_suspend_all(dummy->pcm);
 632         return 0;
 633 }
 634
 635 static int snd_dummy_resume(struct platform_device *pdev)
 636 {
 637         struct snd_card *card = platform_get_drvdata(pdev);
 638
 639         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
 640         return 0;
 641 }
 642 #endif
 643
 644 #define SND_DUMMY_DRIVER        "snd_dummy"
 645
 646 static struct platform_driver snd_dummy_driver = {
 647         .probe          = snd_dummy_probe,
 648         .remove         = __devexit_p(snd_dummy_remove),
 649 #ifdef CONFIG_PM
 650         .suspend        = snd_dummy_suspend,
 651         .resume         = snd_dummy_resume,
 652 #endif
 653         .driver         = {
 654                 .name   = SND_DUMMY_DRIVER
 655         },
 656 };
 657
 658 static void snd_dummy_unregister_all(void)
 659 {
 660         int i;
 661
 662         for (i = 0; i < ARRAY_SIZE(devices); ++i)
 663                 platform_device_unregister(devices[i]);
 664         platform_driver_unregister(&snd_dummy_driver);
 665 }
 666
 667 static int __init alsa_card_dummy_init(void)
 668 {
 669         int i, cards, err;
 670
 671         if ((err = platform_driver_register(&snd_dummy_driver)) < 0)
 672                 return err;
 673
 674         cards = 0;
 675         for (i = 0; i < SNDRV_CARDS; i++) {
 676                 struct platform_device *device;
 677                 if (! enable[i])
 678                         continue;
 679                 device = platform_device_register_simple(SND_DUMMY_DRIVER,
 680                                                          i, NULL, 0);
 681                 if (IS_ERR(device))
 682                         continue;
 683                 if (!platform_get_drvdata(device)) {
 684                         platform_device_unregister(device);
 685                         continue;
 686                 }
 687                 devices[i] = device;
 688                 cards++;
 689         }
 690         if (!cards) {
 691 #ifdef MODULE
 692                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
 693 #endif
 694                 snd_dummy_unregister_all();
 695                 return -ENODEV;
 696         }
 697         return 0;
 698 }
 699
 700 static void __exit alsa_card_dummy_exit(void)
 701 {
 702         snd_dummy_unregister_all();
 703 }
 704
 705 module_init(alsa_card_dummy_init)
 706 module_exit(alsa_card_dummy_exit)