err.no Git - linux-2.6/blob - 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 inline void snd_card_dummy_pcm_timer_start(snd_card_dummy_pcm_t *dpcm)
 176 {
 177         dpcm->timer.expires = 1 + jiffies;
 178         add_timer(&dpcm->timer);
 179 }
 180
 181 static inline void snd_card_dummy_pcm_timer_stop(snd_card_dummy_pcm_t *dpcm)
 182 {
 183         del_timer(&dpcm->timer);
 184 }
 185
 186 static int snd_card_dummy_pcm_trigger(snd_pcm_substream_t *substream, int cmd)
 187 {
 188         snd_pcm_runtime_t *runtime = substream->runtime;
 189         snd_dummy_card_pcm_t *dpcm = runtime->private_data;
 190         int err = 0;
 191
 192         spin_lock(&dpcm->lock);
 193         if (cmd == SNDRV_PCM_TRIGGER_START) {
 194                 snd_card_dummy_pcm_timer_start(dpcm);
 195         } else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
 196                 snd_card_dummy_pcm_timer_stop(dpcm);
 197         } else {
 198                 err = -EINVAL;
 199         }
 200         spin_unlock(&dpcm->lock);
 201         return err;
 202 }
 203
 204 static int snd_card_dummy_pcm_prepare(snd_pcm_substream_t * substream)
 205 {
 206         snd_pcm_runtime_t *runtime = substream->runtime;
 207         snd_card_dummy_pcm_t *dpcm = runtime->private_data;
 208         unsigned int bps;
 209
 210         bps = runtime->rate * runtime->channels;
 211         bps *= snd_pcm_format_width(runtime->format);
 212         bps /= 8;
 213         if (bps <= 0)
 214                 return -EINVAL;
 215         dpcm->pcm_bps = bps;
 216         dpcm->pcm_jiffie = bps / HZ;
 217         dpcm->pcm_size = snd_pcm_lib_buffer_bytes(substream);
 218         dpcm->pcm_count = snd_pcm_lib_period_bytes(substream);
 219         dpcm->pcm_irq_pos = 0;
 220         dpcm->pcm_buf_pos = 0;
 221         return 0;
 222 }
 223
 224 static void snd_card_dummy_pcm_timer_function(unsigned long data)
 225 {
 226         snd_card_dummy_pcm_t *dpcm = (snd_card_dummy_pcm_t *)data;
 227
 228         spin_lock(&dpcm->lock);
 229         dpcm->timer.expires = 1 + jiffies;
 230         add_timer(&dpcm->timer);
 231         dpcm->pcm_irq_pos += dpcm->pcm_jiffie;
 232         dpcm->pcm_buf_pos += dpcm->pcm_jiffie;
 233         dpcm->pcm_buf_pos %= dpcm->pcm_size;
 234         if (dpcm->pcm_irq_pos >= dpcm->pcm_count) {
 235                 dpcm->pcm_irq_pos %= dpcm->pcm_count;
 236                 spin_unlock(&dpcm->lock);
 237                 snd_pcm_period_elapsed(dpcm->substream);
 238                 spin_lock(&dpcm->lock);
 239         }
 240         spin_unlock(&dpcm->lock);
 241 }
 242
 243 static snd_pcm_uframes_t snd_card_dummy_pcm_pointer(snd_pcm_substream_t * substream)
 244 {
 245         snd_pcm_runtime_t *runtime = substream->runtime;
 246         snd_card_dummy_pcm_t *dpcm = runtime->private_data;
 247
 248         return bytes_to_frames(runtime, dpcm->pcm_buf_pos);
 249 }
 250
 251 static snd_pcm_hardware_t snd_card_dummy_playback =
 252 {
 253         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 254                                  SNDRV_PCM_INFO_MMAP_VALID),
 255         .formats =              USE_FORMATS,
 256         .rates =                USE_RATE,
 257         .rate_min =             USE_RATE_MIN,
 258         .rate_max =             USE_RATE_MAX,
 259         .channels_min =         USE_CHANNELS_MIN,
 260         .channels_max =         USE_CHANNELS_MAX,
 261         .buffer_bytes_max =     MAX_BUFFER_SIZE,
 262         .period_bytes_min =     64,
 263         .period_bytes_max =     MAX_BUFFER_SIZE,
 264         .periods_min =          USE_PERIODS_MIN,
 265         .periods_max =          USE_PERIODS_MAX,
 266         .fifo_size =            0,
 267 };
 268
 269 static snd_pcm_hardware_t snd_card_dummy_capture =
 270 {
 271         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 272                                  SNDRV_PCM_INFO_MMAP_VALID),
 273         .formats =              USE_FORMATS,
 274         .rates =                USE_RATE,
 275         .rate_min =             USE_RATE_MIN,
 276         .rate_max =             USE_RATE_MAX,
 277         .channels_min =         USE_CHANNELS_MIN,
 278         .channels_max =         USE_CHANNELS_MAX,
 279         .buffer_bytes_max =     MAX_BUFFER_SIZE,
 280         .period_bytes_min =     64,
 281         .period_bytes_max =     MAX_BUFFER_SIZE,
 282         .periods_min =          USE_PERIODS_MIN,
 283         .periods_max =          USE_PERIODS_MAX,
 284         .fifo_size =            0,
 285 };
 286
 287 static void snd_card_dummy_runtime_free(snd_pcm_runtime_t *runtime)
 288 {
 289         kfree(runtime->private_data);
 290 }
 291
 292 static int snd_card_dummy_hw_params(snd_pcm_substream_t * substream,
 293                                     snd_pcm_hw_params_t * hw_params)
 294 {
 295         return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
 296 }
 297
 298 static int snd_card_dummy_hw_free(snd_pcm_substream_t * substream)
 299 {
 300         return snd_pcm_lib_free_pages(substream);
 301 }
 302
 303 static snd_card_dummy_pcm_t *new_pcm_stream(snd_pcm_substream_t *substream)
 304 {
 305         snd_card_dummy_pcm_t *dpcm;
 306
 307         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
 308         if (! dpcm)
 309                 return dpcm;
 310         init_timer(&dpcm->timer);
 311         dpcm->timer.data = (unsigned long) dpcm;
 312         dpcm->timer.function = snd_card_dummy_pcm_timer_function;
 313         spin_lock_init(&dpcm->lock);
 314         dpcm->substream = substream;
 315         return dpcm;
 316 }
 317
 318 static int snd_card_dummy_playback_open(snd_pcm_substream_t * substream)
 319 {
 320         snd_pcm_runtime_t *runtime = substream->runtime;
 321         snd_card_dummy_pcm_t *dpcm;
 322         int err;
 323
 324         if ((dpcm = new_pcm_stream(substream)) == NULL)
 325                 return -ENOMEM;
 326         runtime->private_data = dpcm;
 327         runtime->private_free = snd_card_dummy_runtime_free;
 328         runtime->hw = snd_card_dummy_playback;
 329         if (substream->pcm->device & 1) {
 330                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 331                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 332         }
 333         if (substream->pcm->device & 2)
 334                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
 335         if ((err = add_playback_constraints(runtime)) < 0) {
 336                 kfree(dpcm);
 337                 return err;
 338         }
 339
 340         return 0;
 341 }
 342
 343 static int snd_card_dummy_capture_open(snd_pcm_substream_t * substream)
 344 {
 345         snd_pcm_runtime_t *runtime = substream->runtime;
 346         snd_card_dummy_pcm_t *dpcm;
 347         int err;
 348
 349         if ((dpcm = new_pcm_stream(substream)) == NULL)
 350                 return -ENOMEM;
 351         runtime->private_data = dpcm;
 352         runtime->private_free = snd_card_dummy_runtime_free;
 353         runtime->hw = snd_card_dummy_capture;
 354         if (substream->pcm->device == 1) {
 355                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 356                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 357         }
 358         if (substream->pcm->device & 2)
 359                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
 360         if ((err = add_capture_constraints(runtime)) < 0) {
 361                 kfree(dpcm);
 362                 return err;
 363         }
 364
 365         return 0;
 366 }
 367
 368 static int snd_card_dummy_playback_close(snd_pcm_substream_t * substream)
 369 {
 370         return 0;
 371 }
 372
 373 static int snd_card_dummy_capture_close(snd_pcm_substream_t * substream)
 374 {
 375         return 0;
 376 }
 377
 378 static snd_pcm_ops_t snd_card_dummy_playback_ops = {
 379         .open =                 snd_card_dummy_playback_open,
 380         .close =                snd_card_dummy_playback_close,
 381         .ioctl =                snd_pcm_lib_ioctl,
 382         .hw_params =            snd_card_dummy_hw_params,
 383         .hw_free =              snd_card_dummy_hw_free,
 384         .prepare =              snd_card_dummy_pcm_prepare,
 385         .trigger =              snd_card_dummy_pcm_trigger,
 386         .pointer =              snd_card_dummy_pcm_pointer,
 387 };
 388
 389 static snd_pcm_ops_t snd_card_dummy_capture_ops = {
 390         .open =                 snd_card_dummy_capture_open,
 391         .close =                snd_card_dummy_capture_close,
 392         .ioctl =                snd_pcm_lib_ioctl,
 393         .hw_params =            snd_card_dummy_hw_params,
 394         .hw_free =              snd_card_dummy_hw_free,
 395         .prepare =              snd_card_dummy_pcm_prepare,
 396         .trigger =              snd_card_dummy_pcm_trigger,
 397         .pointer =              snd_card_dummy_pcm_pointer,
 398 };
 399
 400 static int __init snd_card_dummy_pcm(snd_card_dummy_t *dummy, int device, int substreams)
 401 {
 402         snd_pcm_t *pcm;
 403         int err;
 404
 405         if ((err = snd_pcm_new(dummy->card, "Dummy PCM", device, substreams, substreams, &pcm)) < 0)
 406                 return err;
 407         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_card_dummy_playback_ops);
 408         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_dummy_capture_ops);
 409         pcm->private_data = dummy;
 410         pcm->info_flags = 0;
 411         strcpy(pcm->name, "Dummy PCM");
 412         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
 413                                               snd_dma_continuous_data(GFP_KERNEL),
 414                                               0, 64*1024);
 415         return 0;
 416 }
 417
 418 #define DUMMY_VOLUME(xname, xindex, addr) \
 419 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 420   .info = snd_dummy_volume_info, \
 421   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
 422   .private_value = addr }
 423
 424 static int snd_dummy_volume_info(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo)
 425 {
 426         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 427         uinfo->count = 2;
 428         uinfo->value.integer.min = -50;
 429         uinfo->value.integer.max = 100;
 430         return 0;
 431 }
 432
 433 static int snd_dummy_volume_get(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 434 {
 435         snd_card_dummy_t *dummy = snd_kcontrol_chip(kcontrol);
 436         int addr = kcontrol->private_value;
 437
 438         spin_lock_irq(&dummy->mixer_lock);
 439         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
 440         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
 441         spin_unlock_irq(&dummy->mixer_lock);
 442         return 0;
 443 }
 444
 445 static int snd_dummy_volume_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 446 {
 447         snd_card_dummy_t *dummy = snd_kcontrol_chip(kcontrol);
 448         int change, addr = kcontrol->private_value;
 449         int left, right;
 450
 451         left = ucontrol->value.integer.value[0];
 452         if (left < -50)
 453                 left = -50;
 454         if (left > 100)
 455                 left = 100;
 456         right = ucontrol->value.integer.value[1];
 457         if (right < -50)
 458                 right = -50;
 459         if (right > 100)
 460                 right = 100;
 461         spin_lock_irq(&dummy->mixer_lock);
 462         change = dummy->mixer_volume[addr][0] != left ||
 463                  dummy->mixer_volume[addr][1] != right;
 464         dummy->mixer_volume[addr][0] = left;
 465         dummy->mixer_volume[addr][1] = right;
 466         spin_unlock_irq(&dummy->mixer_lock);
 467         return change;
 468 }
 469
 470 #define DUMMY_CAPSRC(xname, xindex, addr) \
 471 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 472   .info = snd_dummy_capsrc_info, \
 473   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
 474   .private_value = addr }
 475
 476 static int snd_dummy_capsrc_info(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo)
 477 {
 478         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
 479         uinfo->count = 2;
 480         uinfo->value.integer.min = 0;
 481         uinfo->value.integer.max = 1;
 482         return 0;
 483 }
 484
 485 static int snd_dummy_capsrc_get(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 486 {
 487         snd_card_dummy_t *dummy = snd_kcontrol_chip(kcontrol);
 488         int addr = kcontrol->private_value;
 489
 490         spin_lock_irq(&dummy->mixer_lock);
 491         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
 492         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
 493         spin_unlock_irq(&dummy->mixer_lock);
 494         return 0;
 495 }
 496
 497 static int snd_dummy_capsrc_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 498 {
 499         snd_card_dummy_t *dummy = snd_kcontrol_chip(kcontrol);
 500         int change, addr = kcontrol->private_value;
 501         int left, right;
 502
 503         left = ucontrol->value.integer.value[0] & 1;
 504         right = ucontrol->value.integer.value[1] & 1;
 505         spin_lock_irq(&dummy->mixer_lock);
 506         change = dummy->capture_source[addr][0] != left &&
 507                  dummy->capture_source[addr][1] != right;
 508         dummy->capture_source[addr][0] = left;
 509         dummy->capture_source[addr][1] = right;
 510         spin_unlock_irq(&dummy->mixer_lock);
 511         return change;
 512 }
 513
 514 static snd_kcontrol_new_t snd_dummy_controls[] = {
 515 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
 516 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
 517 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
 518 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_MASTER),
 519 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
 520 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_MASTER),
 521 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
 522 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MASTER),
 523 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
 524 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_MASTER)
 525 };
 526
 527 static int __init snd_card_dummy_new_mixer(snd_card_dummy_t * dummy)
 528 {
 529         snd_card_t *card = dummy->card;
 530         unsigned int idx;
 531         int err;
 532
 533         snd_assert(dummy != NULL, return -EINVAL);
 534         spin_lock_init(&dummy->mixer_lock);
 535         strcpy(card->mixername, "Dummy Mixer");
 536
 537         for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
 538                 if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy))) < 0)
 539                         return err;
 540         }
 541         return 0;
 542 }
 543
 544 static int __init snd_card_dummy_probe(int dev)
 545 {
 546         snd_card_t *card;
 547         struct snd_card_dummy *dummy;
 548         int idx, err;
 549
 550         if (!enable[dev])
 551                 return -ENODEV;
 552         card = snd_card_new(index[dev], id[dev], THIS_MODULE,
 553                             sizeof(struct snd_card_dummy));
 554         if (card == NULL)
 555                 return -ENOMEM;
 556         dummy = (struct snd_card_dummy *)card->private_data;
 557         dummy->card = card;
 558         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
 559                 if (pcm_substreams[dev] < 1)
 560                         pcm_substreams[dev] = 1;
 561                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
 562                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
 563                 if ((err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev])) < 0)
 564                         goto __nodev;
 565         }
 566         if ((err = snd_card_dummy_new_mixer(dummy)) < 0)
 567                 goto __nodev;
 568         strcpy(card->driver, "Dummy");
 569         strcpy(card->shortname, "Dummy");
 570         sprintf(card->longname, "Dummy %i", dev + 1);
 571
 572         if ((err = snd_card_set_generic_dev(card)) < 0)
 573                 goto __nodev;
 574
 575         if ((err = snd_card_register(card)) == 0) {
 576                 snd_dummy_cards[dev] = card;
 577                 return 0;
 578         }
 579       __nodev:
 580         snd_card_free(card);
 581         return err;
 582 }
 583
 584 static int __init alsa_card_dummy_init(void)
 585 {
 586         int dev, cards;
 587
 588         for (dev = cards = 0; dev < SNDRV_CARDS && enable[dev]; dev++) {
 589                 if (snd_card_dummy_probe(dev) < 0) {
 590 #ifdef MODULE
 591                         printk(KERN_ERR "Dummy soundcard #%i not found or device busy\n", dev + 1);
 592 #endif
 593                         break;
 594                 }
 595                 cards++;
 596         }
 597         if (!cards) {
 598 #ifdef MODULE
 599                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
 600 #endif
 601                 return -ENODEV;
 602         }
 603         return 0;
 604 }
 605
 606 static void __exit alsa_card_dummy_exit(void)
 607 {
 608         int idx;
 609
 610         for (idx = 0; idx < SNDRV_CARDS; idx++)
 611                 snd_card_free(snd_dummy_cards[idx]);
 612 }
 613
 614 module_init(alsa_card_dummy_init)
 615 module_exit(alsa_card_dummy_exit)