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/jiffies.h>
  24 #include <linux/slab.h>
  25 #include <linux/time.h>
  26 #include <linux/wait.h>
  27 #include <linux/moduleparam.h>
  28 #include <sound/core.h>
  29 #include <sound/control.h>
  30 #include <sound/pcm.h>
  31 #include <sound/rawmidi.h>
  32 #include <sound/initval.h>
  33
  34 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
  35 MODULE_DESCRIPTION("Dummy soundcard (/dev/null)");
  36 MODULE_LICENSE("GPL");
  37 MODULE_SUPPORTED_DEVICE("{{ALSA,Dummy soundcard}}");
  38
  39 #define MAX_PCM_DEVICES         4
  40 #define MAX_PCM_SUBSTREAMS      16
  41 #define MAX_MIDI_DEVICES        2
  42
  43 #if 0 /* emu10k1 emulation */
  44 #define MAX_BUFFER_SIZE         (128 * 1024)
  45 static int emu10k1_playback_constraints(snd_pcm_runtime_t *runtime)
  46 {
  47         int err;
  48         if ((err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
  49                 return err;
  50         if ((err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX)) < 0)
  51                 return err;
  52         return 0;
  53 }
  54 #define add_playback_constraints emu10k1_playback_constraints
  55 #endif
  56
  57 #if 0 /* RME9652 emulation */
  58 #define MAX_BUFFER_SIZE         (26 * 64 * 1024)
  59 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
  60 #define USE_CHANNELS_MIN        26
  61 #define USE_CHANNELS_MAX        26
  62 #define USE_PERIODS_MIN         2
  63 #define USE_PERIODS_MAX         2
  64 #endif
  65
  66 #if 0 /* ICE1712 emulation */
  67 #define MAX_BUFFER_SIZE         (256 * 1024)
  68 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
  69 #define USE_CHANNELS_MIN        10
  70 #define USE_CHANNELS_MAX        10
  71 #define USE_PERIODS_MIN         1
  72 #define USE_PERIODS_MAX         1024
  73 #endif
  74
  75 #if 0 /* UDA1341 emulation */
  76 #define MAX_BUFFER_SIZE         (16380)
  77 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
  78 #define USE_CHANNELS_MIN        2
  79 #define USE_CHANNELS_MAX        2
  80 #define USE_PERIODS_MIN         2
  81 #define USE_PERIODS_MAX         255
  82 #endif
  83
  84 #if 0 /* simple AC97 bridge (intel8x0) with 48kHz AC97 only codec */
  85 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
  86 #define USE_CHANNELS_MIN        2
  87 #define USE_CHANNELS_MAX        2
  88 #define USE_RATE                SNDRV_PCM_RATE_48000
  89 #define USE_RATE_MIN            48000
  90 #define USE_RATE_MAX            48000
  91 #endif
  92
  93
  94 /* defaults */
  95 #ifndef MAX_BUFFER_SIZE
  96 #define MAX_BUFFER_SIZE         (64*1024)
  97 #endif
  98 #ifndef USE_FORMATS
  99 #define USE_FORMATS             (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)
 100 #endif
 101 #ifndef USE_RATE
 102 #define USE_RATE                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000
 103 #define USE_RATE_MIN            5500
 104 #define USE_RATE_MAX            48000
 105 #endif
 106 #ifndef USE_CHANNELS_MIN
 107 #define USE_CHANNELS_MIN        1
 108 #endif
 109 #ifndef USE_CHANNELS_MAX
 110 #define USE_CHANNELS_MAX        2
 111 #endif
 112 #ifndef USE_PERIODS_MIN
 113 #define USE_PERIODS_MIN         1
 114 #endif
 115 #ifndef USE_PERIODS_MAX
 116 #define USE_PERIODS_MAX         1024
 117 #endif
 118 #ifndef add_playback_constraints
 119 #define add_playback_constraints(x) 0
 120 #endif
 121 #ifndef add_capture_constraints
 122 #define add_capture_constraints(x) 0
 123 #endif
 124
 125 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
 126 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
 127 static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
 128 static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
 129 static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
 130 //static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
 131
 132 module_param_array(index, int, NULL, 0444);
 133 MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
 134 module_param_array(id, charp, NULL, 0444);
 135 MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
 136 module_param_array(enable, bool, NULL, 0444);
 137 MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
 138 module_param_array(pcm_devs, int, NULL, 0444);
 139 MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
 140 module_param_array(pcm_substreams, int, NULL, 0444);
 141 MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-16) for dummy driver.");
 142 //module_param_array(midi_devs, int, NULL, 0444);
 143 //MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
 144
 145 #define MIXER_ADDR_MASTER       0
 146 #define MIXER_ADDR_LINE         1
 147 #define MIXER_ADDR_MIC          2
 148 #define MIXER_ADDR_SYNTH        3
 149 #define MIXER_ADDR_CD           4
 150 #define MIXER_ADDR_LAST         4
 151
 152 typedef struct snd_card_dummy {
 153         snd_card_t *card;
 154         spinlock_t mixer_lock;
 155         int mixer_volume[MIXER_ADDR_LAST+1][2];
 156         int capture_source[MIXER_ADDR_LAST+1][2];
 157 } snd_card_dummy_t;
 158
 159 typedef struct snd_card_dummy_pcm {
 160         snd_card_dummy_t *dummy;
 161         spinlock_t lock;
 162         struct timer_list timer;
 163         unsigned int pcm_size;
 164         unsigned int pcm_count;
 165         unsigned int pcm_bps;           /* bytes per second */
 166         unsigned int pcm_jiffie;        /* bytes per one jiffie */
 167         unsigned int pcm_irq_pos;       /* IRQ position */
 168         unsigned int pcm_buf_pos;       /* position in buffer */
 169         snd_pcm_substream_t *substream;
 170 } snd_card_dummy_pcm_t;
 171
 172 static snd_card_t *snd_dummy_cards[SNDRV_CARDS] = SNDRV_DEFAULT_PTR;
 173
 174
 175 static void snd_card_dummy_pcm_timer_start(snd_pcm_substream_t * substream)
 176 {
 177         snd_pcm_runtime_t *runtime = substream->runtime;
 178         snd_card_dummy_pcm_t *dpcm = runtime->private_data;
 179
 180         dpcm->timer.expires = 1 + jiffies;
 181         add_timer(&dpcm->timer);
 182 }
 183
 184 static void snd_card_dummy_pcm_timer_stop(snd_pcm_substream_t * substream)
 185 {
 186         snd_pcm_runtime_t *runtime = substream->runtime;
 187         snd_card_dummy_pcm_t *dpcm = runtime->private_data;
 188
 189         del_timer(&dpcm->timer);
 190 }
 191
 192 static int snd_card_dummy_playback_trigger(snd_pcm_substream_t * substream,
 193                                            int cmd)
 194 {
 195         if (cmd == SNDRV_PCM_TRIGGER_START) {
 196                 snd_card_dummy_pcm_timer_start(substream);
 197         } else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
 198                 snd_card_dummy_pcm_timer_stop(substream);
 199         } else {
 200                 return -EINVAL;
 201         }
 202         return 0;
 203 }
 204
 205 static int snd_card_dummy_capture_trigger(snd_pcm_substream_t * substream,
 206                                           int cmd)
 207 {
 208         if (cmd == SNDRV_PCM_TRIGGER_START) {
 209                 snd_card_dummy_pcm_timer_start(substream);
 210         } else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
 211                 snd_card_dummy_pcm_timer_stop(substream);
 212         } else {
 213                 return -EINVAL;
 214         }
 215         return 0;
 216 }
 217
 218 static int snd_card_dummy_pcm_prepare(snd_pcm_substream_t * substream)
 219 {
 220         snd_pcm_runtime_t *runtime = substream->runtime;
 221         snd_card_dummy_pcm_t *dpcm = runtime->private_data;
 222         unsigned int bps;
 223
 224         bps = runtime->rate * runtime->channels;
 225         bps *= snd_pcm_format_width(runtime->format);
 226         bps /= 8;
 227         if (bps <= 0)
 228                 return -EINVAL;
 229         dpcm->pcm_bps = bps;
 230         dpcm->pcm_jiffie = bps / HZ;
 231         dpcm->pcm_size = snd_pcm_lib_buffer_bytes(substream);
 232         dpcm->pcm_count = snd_pcm_lib_period_bytes(substream);
 233         dpcm->pcm_irq_pos = 0;
 234         dpcm->pcm_buf_pos = 0;
 235         return 0;
 236 }
 237
 238 static int snd_card_dummy_playback_prepare(snd_pcm_substream_t * substream)
 239 {
 240         return snd_card_dummy_pcm_prepare(substream);
 241 }
 242
 243 static int snd_card_dummy_capture_prepare(snd_pcm_substream_t * substream)
 244 {
 245         return snd_card_dummy_pcm_prepare(substream);
 246 }
 247
 248 static void snd_card_dummy_pcm_timer_function(unsigned long data)
 249 {
 250         snd_card_dummy_pcm_t *dpcm = (snd_card_dummy_pcm_t *)data;
 251
 252         dpcm->timer.expires = 1 + jiffies;
 253         add_timer(&dpcm->timer);
 254         spin_lock_irq(&dpcm->lock);
 255         dpcm->pcm_irq_pos += dpcm->pcm_jiffie;
 256         dpcm->pcm_buf_pos += dpcm->pcm_jiffie;
 257         dpcm->pcm_buf_pos %= dpcm->pcm_size;
 258         if (dpcm->pcm_irq_pos >= dpcm->pcm_count) {
 259                 dpcm->pcm_irq_pos %= dpcm->pcm_count;
 260                 snd_pcm_period_elapsed(dpcm->substream);
 261         }
 262         spin_unlock_irq(&dpcm->lock);
 263 }
 264
 265 static snd_pcm_uframes_t snd_card_dummy_playback_pointer(snd_pcm_substream_t * substream)
 266 {
 267         snd_pcm_runtime_t *runtime = substream->runtime;
 268         snd_card_dummy_pcm_t *dpcm = runtime->private_data;
 269
 270         return bytes_to_frames(runtime, dpcm->pcm_buf_pos);
 271 }
 272
 273 static snd_pcm_uframes_t snd_card_dummy_capture_pointer(snd_pcm_substream_t * substream)
 274 {
 275         snd_pcm_runtime_t *runtime = substream->runtime;
 276         snd_card_dummy_pcm_t *dpcm = runtime->private_data;
 277
 278         return bytes_to_frames(runtime, dpcm->pcm_buf_pos);
 279 }
 280
 281 static snd_pcm_hardware_t snd_card_dummy_playback =
 282 {
 283         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 284                                  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_BUFFER_SIZE,
 294         .periods_min =          USE_PERIODS_MIN,
 295         .periods_max =          USE_PERIODS_MAX,
 296         .fifo_size =            0,
 297 };
 298
 299 static snd_pcm_hardware_t snd_card_dummy_capture =
 300 {
 301         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 302                                  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_BUFFER_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(snd_pcm_runtime_t *runtime)
 318 {
 319         snd_card_dummy_pcm_t *dpcm = runtime->private_data;
 320         kfree(dpcm);
 321 }
 322
 323 static int snd_card_dummy_hw_params(snd_pcm_substream_t * substream,
 324                                     snd_pcm_hw_params_t * hw_params)
 325 {
 326         return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
 327 }
 328
 329 static int snd_card_dummy_hw_free(snd_pcm_substream_t * substream)
 330 {
 331         return snd_pcm_lib_free_pages(substream);
 332 }
 333
 334 static int snd_card_dummy_playback_open(snd_pcm_substream_t * substream)
 335 {
 336         snd_pcm_runtime_t *runtime = substream->runtime;
 337         snd_card_dummy_pcm_t *dpcm;
 338         int err;
 339
 340         dpcm = kcalloc(1, sizeof(*dpcm), GFP_KERNEL);
 341         if (dpcm == NULL)
 342                 return -ENOMEM;
 343         init_timer(&dpcm->timer);
 344         dpcm->timer.data = (unsigned long) dpcm;
 345         dpcm->timer.function = snd_card_dummy_pcm_timer_function;
 346         spin_lock_init(&dpcm->lock);
 347         dpcm->substream = substream;
 348         runtime->private_data = dpcm;
 349         runtime->private_free = snd_card_dummy_runtime_free;
 350         runtime->hw = snd_card_dummy_playback;
 351         if (substream->pcm->device & 1) {
 352                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 353                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 354         }
 355         if (substream->pcm->device & 2)
 356                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
 357         if ((err = add_playback_constraints(runtime)) < 0) {
 358                 kfree(dpcm);
 359                 return err;
 360         }
 361
 362         return 0;
 363 }
 364
 365 static int snd_card_dummy_capture_open(snd_pcm_substream_t * substream)
 366 {
 367         snd_pcm_runtime_t *runtime = substream->runtime;
 368         snd_card_dummy_pcm_t *dpcm;
 369         int err;
 370
 371         dpcm = kcalloc(1, sizeof(*dpcm), GFP_KERNEL);
 372         if (dpcm == NULL)
 373                 return -ENOMEM;
 374         init_timer(&dpcm->timer);
 375         dpcm->timer.data = (unsigned long) dpcm;
 376         dpcm->timer.function = snd_card_dummy_pcm_timer_function;
 377         spin_lock_init(&dpcm->lock);
 378         dpcm->substream = substream;
 379         runtime->private_data = dpcm;
 380         runtime->private_free = snd_card_dummy_runtime_free;
 381         runtime->hw = snd_card_dummy_capture;
 382         if (substream->pcm->device == 1) {
 383                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 384                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 385         }
 386         if (substream->pcm->device & 2)
 387                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
 388         if ((err = add_capture_constraints(runtime)) < 0) {
 389                 kfree(dpcm);
 390                 return err;
 391         }
 392
 393         return 0;
 394 }
 395
 396 static int snd_card_dummy_playback_close(snd_pcm_substream_t * substream)
 397 {
 398         return 0;
 399 }
 400
 401 static int snd_card_dummy_capture_close(snd_pcm_substream_t * substream)
 402 {
 403         return 0;
 404 }
 405
 406 static snd_pcm_ops_t 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_playback_prepare,
 413         .trigger =              snd_card_dummy_playback_trigger,
 414         .pointer =              snd_card_dummy_playback_pointer,
 415 };
 416
 417 static snd_pcm_ops_t 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_capture_prepare,
 424         .trigger =              snd_card_dummy_capture_trigger,
 425         .pointer =              snd_card_dummy_capture_pointer,
 426 };
 427
 428 static int __init snd_card_dummy_pcm(snd_card_dummy_t *dummy, int device, int substreams)
 429 {
 430         snd_pcm_t *pcm;
 431         int err;
 432
 433         if ((err = snd_pcm_new(dummy->card, "Dummy PCM", device, substreams, substreams, &pcm)) < 0)
 434                 return err;
 435         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_card_dummy_playback_ops);
 436         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_dummy_capture_ops);
 437         pcm->private_data = dummy;
 438         pcm->info_flags = 0;
 439         strcpy(pcm->name, "Dummy PCM");
 440         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
 441                                               snd_dma_continuous_data(GFP_KERNEL),
 442                                               0, 64*1024);
 443         return 0;
 444 }
 445
 446 #define DUMMY_VOLUME(xname, xindex, addr) \
 447 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 448   .info = snd_dummy_volume_info, \
 449   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
 450   .private_value = addr }
 451
 452 static int snd_dummy_volume_info(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo)
 453 {
 454         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 455         uinfo->count = 2;
 456         uinfo->value.integer.min = -50;
 457         uinfo->value.integer.max = 100;
 458         return 0;
 459 }
 460
 461 static int snd_dummy_volume_get(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 462 {
 463         snd_card_dummy_t *dummy = snd_kcontrol_chip(kcontrol);
 464         unsigned long flags;
 465         int addr = kcontrol->private_value;
 466
 467         spin_lock_irqsave(&dummy->mixer_lock, flags);
 468         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
 469         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
 470         spin_unlock_irqrestore(&dummy->mixer_lock, flags);
 471         return 0;
 472 }
 473
 474 static int snd_dummy_volume_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 475 {
 476         snd_card_dummy_t *dummy = snd_kcontrol_chip(kcontrol);
 477         unsigned long flags;
 478         int change, addr = kcontrol->private_value;
 479         int left, right;
 480
 481         left = ucontrol->value.integer.value[0];
 482         if (left < -50)
 483                 left = -50;
 484         if (left > 100)
 485                 left = 100;
 486         right = ucontrol->value.integer.value[1];
 487         if (right < -50)
 488                 right = -50;
 489         if (right > 100)
 490                 right = 100;
 491         spin_lock_irqsave(&dummy->mixer_lock, flags);
 492         change = dummy->mixer_volume[addr][0] != left ||
 493                  dummy->mixer_volume[addr][1] != right;
 494         dummy->mixer_volume[addr][0] = left;
 495         dummy->mixer_volume[addr][1] = right;
 496         spin_unlock_irqrestore(&dummy->mixer_lock, flags);
 497         return change;
 498 }
 499
 500 #define DUMMY_CAPSRC(xname, xindex, addr) \
 501 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 502   .info = snd_dummy_capsrc_info, \
 503   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
 504   .private_value = addr }
 505
 506 static int snd_dummy_capsrc_info(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo)
 507 {
 508         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
 509         uinfo->count = 2;
 510         uinfo->value.integer.min = 0;
 511         uinfo->value.integer.max = 1;
 512         return 0;
 513 }
 514
 515 static int snd_dummy_capsrc_get(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 516 {
 517         snd_card_dummy_t *dummy = snd_kcontrol_chip(kcontrol);
 518         unsigned long flags;
 519         int addr = kcontrol->private_value;
 520
 521         spin_lock_irqsave(&dummy->mixer_lock, flags);
 522         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
 523         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
 524         spin_unlock_irqrestore(&dummy->mixer_lock, flags);
 525         return 0;
 526 }
 527
 528 static int snd_dummy_capsrc_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 529 {
 530         snd_card_dummy_t *dummy = snd_kcontrol_chip(kcontrol);
 531         unsigned long flags;
 532         int change, addr = kcontrol->private_value;
 533         int left, right;
 534
 535         left = ucontrol->value.integer.value[0] & 1;
 536         right = ucontrol->value.integer.value[1] & 1;
 537         spin_lock_irqsave(&dummy->mixer_lock, flags);
 538         change = dummy->capture_source[addr][0] != left &&
 539                  dummy->capture_source[addr][1] != right;
 540         dummy->capture_source[addr][0] = left;
 541         dummy->capture_source[addr][1] = right;
 542         spin_unlock_irqrestore(&dummy->mixer_lock, flags);
 543         return change;
 544 }
 545
 546 static snd_kcontrol_new_t snd_dummy_controls[] = {
 547 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
 548 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
 549 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
 550 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_MASTER),
 551 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
 552 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_MASTER),
 553 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
 554 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MASTER),
 555 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
 556 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_MASTER)
 557 };
 558
 559 static int __init snd_card_dummy_new_mixer(snd_card_dummy_t * dummy)
 560 {
 561         snd_card_t *card = dummy->card;
 562         unsigned int idx;
 563         int err;
 564
 565         snd_assert(dummy != NULL, return -EINVAL);
 566         spin_lock_init(&dummy->mixer_lock);
 567         strcpy(card->mixername, "Dummy Mixer");
 568
 569         for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
 570                 if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy))) < 0)
 571                         return err;
 572         }
 573         return 0;
 574 }
 575
 576 static int __init snd_card_dummy_probe(int dev)
 577 {
 578         snd_card_t *card;
 579         struct snd_card_dummy *dummy;
 580         int idx, err;
 581
 582         if (!enable[dev])
 583                 return -ENODEV;
 584         card = snd_card_new(index[dev], id[dev], THIS_MODULE,
 585                             sizeof(struct snd_card_dummy));
 586         if (card == NULL)
 587                 return -ENOMEM;
 588         dummy = (struct snd_card_dummy *)card->private_data;
 589         dummy->card = card;
 590         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
 591                 if (pcm_substreams[dev] < 1)
 592                         pcm_substreams[dev] = 1;
 593                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
 594                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
 595                 if ((err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev])) < 0)
 596                         goto __nodev;
 597         }
 598         if ((err = snd_card_dummy_new_mixer(dummy)) < 0)
 599                 goto __nodev;
 600         strcpy(card->driver, "Dummy");
 601         strcpy(card->shortname, "Dummy");
 602         sprintf(card->longname, "Dummy %i", dev + 1);
 603         if ((err = snd_card_register(card)) == 0) {
 604                 snd_dummy_cards[dev] = card;
 605                 return 0;
 606         }
 607       __nodev:
 608         snd_card_free(card);
 609         return err;
 610 }
 611
 612 static int __init alsa_card_dummy_init(void)
 613 {
 614         int dev, cards;
 615
 616         for (dev = cards = 0; dev < SNDRV_CARDS && enable[dev]; dev++) {
 617                 if (snd_card_dummy_probe(dev) < 0) {
 618 #ifdef MODULE
 619                         printk(KERN_ERR "Dummy soundcard #%i not found or device busy\n", dev + 1);
 620 #endif
 621                         break;
 622                 }
 623                 cards++;
 624         }
 625         if (!cards) {
 626 #ifdef MODULE
 627                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
 628 #endif
 629                 return -ENODEV;
 630         }
 631         return 0;
 632 }
 633
 634 static void __exit alsa_card_dummy_exit(void)
 635 {
 636         int idx;
 637
 638         for (idx = 0; idx < SNDRV_CARDS; idx++)
 639                 snd_card_free(snd_dummy_cards[idx]);
 640 }
 641
 642 module_init(alsa_card_dummy_init)
 643 module_exit(alsa_card_dummy_exit)