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/version.h>
  23 #include <linux/init.h>
  24 #include <linux/jiffies.h>
  25 #include <linux/slab.h>
  26 #include <linux/time.h>
  27 #include <linux/wait.h>
  28 #include <sound/core.h>
  29 #include <sound/control.h>
  30 #include <sound/pcm.h>
  31 #include <sound/rawmidi.h>
  32 #define SNDRV_GET_ID
  33 #include <sound/initval.h>
  34
  35 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
  36 MODULE_DESCRIPTION("Dummy soundcard (/dev/null)");
  37 MODULE_LICENSE("GPL");
  38 MODULE_CLASSES("{sound}");
  39 MODULE_DEVICES("{{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 /* RME9652 emulation */
  46 #define MAX_BUFFER_SIZE         (26 * 64 * 1024)
  47 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
  48 #define USE_CHANNELS_MIN        26
  49 #define USE_CHANNELS_MAX        26
  50 #define USE_PERIODS_MIN         2
  51 #define USE_PERIODS_MAX         2
  52 #endif
  53
  54 #if 0 /* ICE1712 emulation */
  55 #define MAX_BUFFER_SIZE         (256 * 1024)
  56 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
  57 #define USE_CHANNELS_MIN        10
  58 #define USE_CHANNELS_MAX        10
  59 #define USE_PERIODS_MIN         1
  60 #define USE_PERIODS_MAX         1024
  61 #endif
  62
  63 #if 0 /* UDA1341 emulation */
  64 #define MAX_BUFFER_SIZE         (16380)
  65 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
  66 #define USE_CHANNELS_MIN        2
  67 #define USE_CHANNELS_MAX        2
  68 #define USE_PERIODS_MIN         2
  69 #define USE_PERIODS_MAX         255
  70 #endif
  71
  72 #if 0 /* simple AC97 bridge (intel8x0) with 48kHz AC97 only codec */
  73 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
  74 #define USE_CHANNELS_MIN        2
  75 #define USE_CHANNELS_MAX        2
  76 #define USE_RATE                SNDRV_PCM_RATE_48000
  77 #define USE_RATE_MIN            48000
  78 #define USE_RATE_MAX            48000
  79 #endif
  80
  81
  82 /* defaults */
  83 #ifndef MAX_BUFFER_SIZE
  84 #define MAX_BUFFER_SIZE         (64*1024)
  85 #endif
  86 #ifndef USE_FORMATS
  87 #define USE_FORMATS             (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)
  88 #endif
  89 #ifndef USE_RATE
  90 #define USE_RATE                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000
  91 #define USE_RATE_MIN            5500
  92 #define USE_RATE_MAX            48000
  93 #endif
  94 #ifndef USE_CHANNELS_MIN
  95 #define USE_CHANNELS_MIN        1
  96 #endif
  97 #ifndef USE_CHANNELS_MAX
  98 #define USE_CHANNELS_MAX        2
  99 #endif
 100 #ifndef USE_PERIODS_MIN
 101 #define USE_PERIODS_MIN         1
 102 #endif
 103 #ifndef USE_PERIODS_MAX
 104 #define USE_PERIODS_MAX         1024
 105 #endif
 106
 107 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
 108 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
 109 static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
 110 static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
 111 static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
 112 //static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
 113
 114 MODULE_PARM(index, "1-" __MODULE_STRING(SNDRV_CARDS) "i");
 115 MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
 116 MODULE_PARM_SYNTAX(index, SNDRV_INDEX_DESC);
 117 MODULE_PARM(id, "1-" __MODULE_STRING(SNDRV_CARDS) "s");
 118 MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
 119 MODULE_PARM_SYNTAX(id, SNDRV_ID_DESC);
 120 MODULE_PARM(enable, "1-" __MODULE_STRING(SNDRV_CARDS) "i");
 121 MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
 122 MODULE_PARM_SYNTAX(enable, SNDRV_ENABLE_DESC);
 123 MODULE_PARM(pcm_devs, "1-" __MODULE_STRING(SNDRV_CARDS) "i");
 124 MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
 125 MODULE_PARM_SYNTAX(pcm_devs, SNDRV_ENABLED ",allows:{{0,4}},default:1,dialog:list");
 126 MODULE_PARM(pcm_substreams, "1-" __MODULE_STRING(SNDRV_CARDS) "i");
 127 MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-16) for dummy driver.");
 128 MODULE_PARM_SYNTAX(pcm_substreams, SNDRV_ENABLED ",allows:{{1,16}},default:8,dialog:list");
 129 //MODULE_PARM(midi_devs, "1-" __MODULE_STRING(SNDRV_CARDS) "i");
 130 //MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
 131 //MODULE_PARM_SYNTAX(midi_devs, SNDRV_ENABLED ",allows:{{0,2}},default:8,dialog:list");
 132
 133 #define MIXER_ADDR_MASTER       0
 134 #define MIXER_ADDR_LINE         1
 135 #define MIXER_ADDR_MIC          2
 136 #define MIXER_ADDR_SYNTH        3
 137 #define MIXER_ADDR_CD           4
 138 #define MIXER_ADDR_LAST         4
 139
 140 typedef struct snd_card_dummy {
 141         snd_card_t *card;
 142         spinlock_t mixer_lock;
 143         int mixer_volume[MIXER_ADDR_LAST+1][2];
 144         int capture_source[MIXER_ADDR_LAST+1][2];
 145 } snd_card_dummy_t;
 146
 147 typedef struct snd_card_dummy_pcm {
 148         snd_card_dummy_t *dummy;
 149         spinlock_t lock;
 150         struct timer_list timer;
 151         unsigned int pcm_size;
 152         unsigned int pcm_count;
 153         unsigned int pcm_bps;           /* bytes per second */
 154         unsigned int pcm_jiffie;        /* bytes per one jiffie */
 155         unsigned int pcm_irq_pos;       /* IRQ position */
 156         unsigned int pcm_buf_pos;       /* position in buffer */
 157         snd_pcm_substream_t *substream;
 158 } snd_card_dummy_pcm_t;
 159
 160 static snd_card_t *snd_dummy_cards[SNDRV_CARDS] = SNDRV_DEFAULT_PTR;
 161
 162
 163 static int snd_card_dummy_playback_ioctl(snd_pcm_substream_t * substream,
 164                                          unsigned int cmd,
 165                                          void *arg)
 166 {
 167         return snd_pcm_lib_ioctl(substream, cmd, arg);
 168 }
 169
 170 static int snd_card_dummy_capture_ioctl(snd_pcm_substream_t * substream,
 171                                         unsigned int cmd,
 172                                         void *arg)
 173 {
 174         return snd_pcm_lib_ioctl(substream, cmd, arg);
 175 }
 176
 177 static void snd_card_dummy_pcm_timer_start(snd_pcm_substream_t * substream)
 178 {
 179         snd_pcm_runtime_t *runtime = substream->runtime;
 180         snd_card_dummy_pcm_t *dpcm = snd_magic_cast(snd_card_dummy_pcm_t, runtime->private_data, return);
 181
 182         dpcm->timer.expires = 1 + jiffies;
 183         add_timer(&dpcm->timer);
 184 }
 185
 186 static void snd_card_dummy_pcm_timer_stop(snd_pcm_substream_t * substream)
 187 {
 188         snd_pcm_runtime_t *runtime = substream->runtime;
 189         snd_card_dummy_pcm_t *dpcm = snd_magic_cast(snd_card_dummy_pcm_t, runtime->private_data, return);
 190
 191         del_timer(&dpcm->timer);
 192 }
 193
 194 static int snd_card_dummy_playback_trigger(snd_pcm_substream_t * substream,
 195                                            int cmd)
 196 {
 197         if (cmd == SNDRV_PCM_TRIGGER_START) {
 198                 snd_card_dummy_pcm_timer_start(substream);
 199         } else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
 200                 snd_card_dummy_pcm_timer_stop(substream);
 201         } else {
 202                 return -EINVAL;
 203         }
 204         return 0;
 205 }
 206
 207 static int snd_card_dummy_capture_trigger(snd_pcm_substream_t * substream,
 208                                           int cmd)
 209 {
 210         if (cmd == SNDRV_PCM_TRIGGER_START) {
 211                 snd_card_dummy_pcm_timer_start(substream);
 212         } else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
 213                 snd_card_dummy_pcm_timer_stop(substream);
 214         } else {
 215                 return -EINVAL;
 216         }
 217         return 0;
 218 }
 219
 220 static int snd_card_dummy_pcm_prepare(snd_pcm_substream_t * substream)
 221 {
 222         snd_pcm_runtime_t *runtime = substream->runtime;
 223         snd_card_dummy_pcm_t *dpcm = snd_magic_cast(snd_card_dummy_pcm_t, runtime->private_data, return -ENXIO);
 224         unsigned int bps;
 225
 226         bps = runtime->rate * runtime->channels;
 227         bps *= snd_pcm_format_width(runtime->format);
 228         bps /= 8;
 229         if (bps <= 0)
 230                 return -EINVAL;
 231         dpcm->pcm_bps = bps;
 232         dpcm->pcm_jiffie = bps / HZ;
 233         dpcm->pcm_size = snd_pcm_lib_buffer_bytes(substream);
 234         dpcm->pcm_count = snd_pcm_lib_period_bytes(substream);
 235         dpcm->pcm_irq_pos = 0;
 236         dpcm->pcm_buf_pos = 0;
 237         return 0;
 238 }
 239
 240 static int snd_card_dummy_playback_prepare(snd_pcm_substream_t * substream)
 241 {
 242         return snd_card_dummy_pcm_prepare(substream);
 243 }
 244
 245 static int snd_card_dummy_capture_prepare(snd_pcm_substream_t * substream)
 246 {
 247         return snd_card_dummy_pcm_prepare(substream);
 248 }
 249
 250 static void snd_card_dummy_pcm_timer_function(unsigned long data)
 251 {
 252         snd_card_dummy_pcm_t *dpcm = snd_magic_cast(snd_card_dummy_pcm_t, (void *)data, return);
 253
 254         dpcm->timer.expires = 1 + jiffies;
 255         add_timer(&dpcm->timer);
 256         spin_lock_irq(&dpcm->lock);
 257         dpcm->pcm_irq_pos += dpcm->pcm_jiffie;
 258         dpcm->pcm_buf_pos += dpcm->pcm_jiffie;
 259         dpcm->pcm_buf_pos %= dpcm->pcm_size;
 260         if (dpcm->pcm_irq_pos >= dpcm->pcm_count) {
 261                 dpcm->pcm_irq_pos %= dpcm->pcm_count;
 262                 snd_pcm_period_elapsed(dpcm->substream);
 263         }
 264         spin_unlock_irq(&dpcm->lock);
 265 }
 266
 267 static snd_pcm_uframes_t snd_card_dummy_playback_pointer(snd_pcm_substream_t * substream)
 268 {
 269         snd_pcm_runtime_t *runtime = substream->runtime;
 270         snd_card_dummy_pcm_t *dpcm = snd_magic_cast(snd_card_dummy_pcm_t, runtime->private_data, return -ENXIO);
 271
 272         return bytes_to_frames(runtime, dpcm->pcm_buf_pos);
 273 }
 274
 275 static snd_pcm_uframes_t snd_card_dummy_capture_pointer(snd_pcm_substream_t * substream)
 276 {
 277         snd_pcm_runtime_t *runtime = substream->runtime;
 278         snd_card_dummy_pcm_t *dpcm = snd_magic_cast(snd_card_dummy_pcm_t, runtime->private_data, return -ENXIO);
 279
 280         return bytes_to_frames(runtime, dpcm->pcm_buf_pos);
 281 }
 282
 283 static snd_pcm_hardware_t snd_card_dummy_playback =
 284 {
 285         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 286                                  SNDRV_PCM_INFO_MMAP_VALID),
 287         .formats =              USE_FORMATS,
 288         .rates =                USE_RATE,
 289         .rate_min =             USE_RATE_MIN,
 290         .rate_max =             USE_RATE_MAX,
 291         .channels_min =         USE_CHANNELS_MIN,
 292         .channels_max =         USE_CHANNELS_MAX,
 293         .buffer_bytes_max =     MAX_BUFFER_SIZE,
 294         .period_bytes_min =     64,
 295         .period_bytes_max =     MAX_BUFFER_SIZE,
 296         .periods_min =          USE_PERIODS_MIN,
 297         .periods_max =          USE_PERIODS_MAX,
 298         .fifo_size =            0,
 299 };
 300
 301 static snd_pcm_hardware_t snd_card_dummy_capture =
 302 {
 303         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 304                                  SNDRV_PCM_INFO_MMAP_VALID),
 305         .formats =              USE_FORMATS,
 306         .rates =                USE_RATE,
 307         .rate_min =             USE_RATE_MIN,
 308         .rate_max =             USE_RATE_MAX,
 309         .channels_min =         USE_CHANNELS_MIN,
 310         .channels_max =         USE_CHANNELS_MAX,
 311         .buffer_bytes_max =     MAX_BUFFER_SIZE,
 312         .period_bytes_min =     64,
 313         .period_bytes_max =     MAX_BUFFER_SIZE,
 314         .periods_min =          USE_PERIODS_MIN,
 315         .periods_max =          USE_PERIODS_MAX,
 316         .fifo_size =            0,
 317 };
 318
 319 static void snd_card_dummy_runtime_free(snd_pcm_runtime_t *runtime)
 320 {
 321         snd_card_dummy_pcm_t *dpcm = snd_magic_cast(snd_card_dummy_pcm_t, runtime->private_data, return);
 322         snd_magic_kfree(dpcm);
 323 }
 324
 325 static int snd_card_dummy_playback_open(snd_pcm_substream_t * substream)
 326 {
 327         snd_pcm_runtime_t *runtime = substream->runtime;
 328         snd_card_dummy_pcm_t *dpcm;
 329
 330         dpcm = snd_magic_kcalloc(snd_card_dummy_pcm_t, 0, GFP_KERNEL);
 331         if (dpcm == NULL)
 332                 return -ENOMEM;
 333         if ((runtime->dma_area = snd_malloc_pages_fallback(MAX_BUFFER_SIZE, GFP_KERNEL, &runtime->dma_bytes)) == NULL) {
 334                 snd_magic_kfree(dpcm);
 335                 return -ENOMEM;
 336         }
 337         init_timer(&dpcm->timer);
 338         dpcm->timer.data = (unsigned long) dpcm;
 339         dpcm->timer.function = snd_card_dummy_pcm_timer_function;
 340         spin_lock_init(&dpcm->lock);
 341         dpcm->substream = substream;
 342         runtime->private_data = dpcm;
 343         runtime->private_free = snd_card_dummy_runtime_free;
 344         runtime->hw = snd_card_dummy_playback;
 345         if (substream->pcm->device & 1) {
 346                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 347                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 348         }
 349         if (substream->pcm->device & 2)
 350                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
 351         return 0;
 352 }
 353
 354 static int snd_card_dummy_capture_open(snd_pcm_substream_t * substream)
 355 {
 356         snd_pcm_runtime_t *runtime = substream->runtime;
 357         snd_card_dummy_pcm_t *dpcm;
 358
 359         dpcm = snd_magic_kcalloc(snd_card_dummy_pcm_t, 0, GFP_KERNEL);
 360         if (dpcm == NULL)
 361                 return -ENOMEM;
 362         if ((runtime->dma_area = snd_malloc_pages_fallback(MAX_BUFFER_SIZE, GFP_KERNEL, &runtime->dma_bytes)) == NULL) {
 363                 snd_magic_kfree(dpcm);
 364                 return -ENOMEM;
 365         }
 366         memset(runtime->dma_area, 0, runtime->dma_bytes);
 367         init_timer(&dpcm->timer);
 368         dpcm->timer.data = (unsigned long) dpcm;
 369         dpcm->timer.function = snd_card_dummy_pcm_timer_function;
 370         spin_lock_init(&dpcm->lock);
 371         dpcm->substream = substream;
 372         runtime->private_data = dpcm;
 373         runtime->private_free = snd_card_dummy_runtime_free;
 374         runtime->hw = snd_card_dummy_capture;
 375         if (substream->pcm->device == 1) {
 376                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 377                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 378         }
 379         if (substream->pcm->device & 2)
 380                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
 381         return 0;
 382 }
 383
 384 static int snd_card_dummy_playback_close(snd_pcm_substream_t * substream)
 385 {
 386         snd_pcm_runtime_t *runtime = substream->runtime;
 387
 388         snd_free_pages(runtime->dma_area, runtime->dma_bytes);
 389         return 0;
 390 }
 391
 392 static int snd_card_dummy_capture_close(snd_pcm_substream_t * substream)
 393 {
 394         snd_pcm_runtime_t *runtime = substream->runtime;
 395
 396         snd_free_pages(runtime->dma_area, runtime->dma_bytes);
 397         return 0;
 398 }
 399
 400 static snd_pcm_ops_t snd_card_dummy_playback_ops = {
 401         .open =                 snd_card_dummy_playback_open,
 402         .close =                snd_card_dummy_playback_close,
 403         .ioctl =                snd_card_dummy_playback_ioctl,
 404         .prepare =              snd_card_dummy_playback_prepare,
 405         .trigger =              snd_card_dummy_playback_trigger,
 406         .pointer =              snd_card_dummy_playback_pointer,
 407 };
 408
 409 static snd_pcm_ops_t snd_card_dummy_capture_ops = {
 410         .open =                 snd_card_dummy_capture_open,
 411         .close =                snd_card_dummy_capture_close,
 412         .ioctl =                snd_card_dummy_capture_ioctl,
 413         .prepare =              snd_card_dummy_capture_prepare,
 414         .trigger =              snd_card_dummy_capture_trigger,
 415         .pointer =              snd_card_dummy_capture_pointer,
 416 };
 417
 418 static int __init snd_card_dummy_pcm(snd_card_dummy_t *dummy, int device, int substreams)
 419 {
 420         snd_pcm_t *pcm;
 421         int err;
 422
 423         if ((err = snd_pcm_new(dummy->card, "Dummy PCM", device, substreams, substreams, &pcm)) < 0)
 424                 return err;
 425         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_card_dummy_playback_ops);
 426         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_dummy_capture_ops);
 427         pcm->private_data = dummy;
 428         pcm->info_flags = 0;
 429         strcpy(pcm->name, "Dummy PCM");
 430         return 0;
 431 }
 432
 433 #define DUMMY_VOLUME(xname, xindex, addr) \
 434 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 435   .info = snd_dummy_volume_info, \
 436   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
 437   .private_value = addr }
 438
 439 static int snd_dummy_volume_info(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo)
 440 {
 441         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 442         uinfo->count = 2;
 443         uinfo->value.integer.min = -50;
 444         uinfo->value.integer.max = 100;
 445         return 0;
 446 }
 447
 448 static int snd_dummy_volume_get(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 449 {
 450         snd_card_dummy_t *dummy = _snd_kcontrol_chip(kcontrol);
 451         unsigned long flags;
 452         int addr = kcontrol->private_value;
 453
 454         spin_lock_irqsave(&dummy->mixer_lock, flags);
 455         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
 456         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
 457         spin_unlock_irqrestore(&dummy->mixer_lock, flags);
 458         return 0;
 459 }
 460
 461 static int snd_dummy_volume_put(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 change, addr = kcontrol->private_value;
 466         int left, right;
 467
 468         left = ucontrol->value.integer.value[0];
 469         if (left < -50)
 470                 left = -50;
 471         if (left > 100)
 472                 left = 100;
 473         right = ucontrol->value.integer.value[1];
 474         if (right < -50)
 475                 right = -50;
 476         if (right > 100)
 477                 right = 100;
 478         spin_lock_irqsave(&dummy->mixer_lock, flags);
 479         change = dummy->mixer_volume[addr][0] != left ||
 480                  dummy->mixer_volume[addr][1] != right;
 481         dummy->mixer_volume[addr][0] = left;
 482         dummy->mixer_volume[addr][1] = right;
 483         spin_unlock_irqrestore(&dummy->mixer_lock, flags);
 484         return change;
 485 }
 486
 487 #define DUMMY_CAPSRC(xname, xindex, addr) \
 488 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 489   .info = snd_dummy_capsrc_info, \
 490   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
 491   .private_value = addr }
 492
 493 static int snd_dummy_capsrc_info(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo)
 494 {
 495         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
 496         uinfo->count = 2;
 497         uinfo->value.integer.min = 0;
 498         uinfo->value.integer.max = 1;
 499         return 0;
 500 }
 501
 502 static int snd_dummy_capsrc_get(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 503 {
 504         snd_card_dummy_t *dummy = _snd_kcontrol_chip(kcontrol);
 505         unsigned long flags;
 506         int addr = kcontrol->private_value;
 507
 508         spin_lock_irqsave(&dummy->mixer_lock, flags);
 509         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
 510         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
 511         spin_unlock_irqrestore(&dummy->mixer_lock, flags);
 512         return 0;
 513 }
 514
 515 static int snd_dummy_capsrc_put(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 change, addr = kcontrol->private_value;
 520         int left, right;
 521
 522         left = ucontrol->value.integer.value[0] & 1;
 523         right = ucontrol->value.integer.value[1] & 1;
 524         spin_lock_irqsave(&dummy->mixer_lock, flags);
 525         change = dummy->capture_source[addr][0] != left &&
 526                  dummy->capture_source[addr][1] != right;
 527         dummy->capture_source[addr][0] = left;
 528         dummy->capture_source[addr][1] = right;
 529         spin_unlock_irqrestore(&dummy->mixer_lock, flags);
 530         return change;
 531 }
 532
 533 #define DUMMY_CONTROLS (sizeof(snd_dummy_controls)/sizeof(snd_kcontrol_new_t))
 534
 535 static snd_kcontrol_new_t snd_dummy_controls[] = {
 536 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
 537 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
 538 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
 539 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_MASTER),
 540 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
 541 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_MASTER),
 542 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
 543 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MASTER),
 544 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
 545 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_MASTER)
 546 };
 547
 548 int __init snd_card_dummy_new_mixer(snd_card_dummy_t * dummy)
 549 {
 550         snd_card_t *card = dummy->card;
 551         unsigned int idx;
 552         int err;
 553
 554         snd_assert(dummy != NULL, return -EINVAL);
 555         spin_lock_init(&dummy->mixer_lock);
 556         strcpy(card->mixername, "Dummy Mixer");
 557
 558         for (idx = 0; idx < DUMMY_CONTROLS; idx++) {
 559                 if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy))) < 0)
 560                         return err;
 561         }
 562         return 0;
 563 }
 564
 565 static int __init snd_card_dummy_probe(int dev)
 566 {
 567         snd_card_t *card;
 568         struct snd_card_dummy *dummy;
 569         int idx, err;
 570
 571         if (!enable[dev])
 572                 return -ENODEV;
 573         card = snd_card_new(index[dev], id[dev], THIS_MODULE,
 574                             sizeof(struct snd_card_dummy));
 575         if (card == NULL)
 576                 return -ENOMEM;
 577         dummy = (struct snd_card_dummy *)card->private_data;
 578         dummy->card = card;
 579         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
 580                 if (pcm_substreams[dev] < 1)
 581                         pcm_substreams[dev] = 1;
 582                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
 583                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
 584                 if ((err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev])) < 0)
 585                         goto __nodev;
 586         }
 587         if ((err = snd_card_dummy_new_mixer(dummy)) < 0)
 588                 goto __nodev;
 589         strcpy(card->driver, "Dummy");
 590         strcpy(card->shortname, "Dummy");
 591         sprintf(card->longname, "Dummy %i", dev + 1);
 592         if ((err = snd_card_register(card)) == 0) {
 593                 snd_dummy_cards[dev] = card;
 594                 return 0;
 595         }
 596       __nodev:
 597         snd_card_free(card);
 598         return err;
 599 }
 600
 601 static int __init alsa_card_dummy_init(void)
 602 {
 603         int dev, cards;
 604
 605         for (dev = cards = 0; dev < SNDRV_CARDS && enable[dev]; dev++) {
 606                 if (snd_card_dummy_probe(dev) < 0) {
 607 #ifdef MODULE
 608                         printk(KERN_ERR "Dummy soundcard #%i not found or device busy\n", dev + 1);
 609 #endif
 610                         break;
 611                 }
 612                 cards++;
 613         }
 614         if (!cards) {
 615 #ifdef MODULE
 616                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
 617 #endif
 618                 return -ENODEV;
 619         }
 620         return 0;
 621 }
 622
 623 static void __exit alsa_card_dummy_exit(void)
 624 {
 625         int idx;
 626
 627         for (idx = 0; idx < SNDRV_CARDS; idx++)
 628                 snd_card_free(snd_dummy_cards[idx]);
 629 }
 630
 631 module_init(alsa_card_dummy_init)
 632 module_exit(alsa_card_dummy_exit)
 633
 634 #ifndef MODULE
 635
 636 /* format is: snd-dummy=enable,index,id,
 637                         pcm_devs,pcm_substreams */
 638
 639 static int __init alsa_card_dummy_setup(char *str)
 640 {
 641         static unsigned __initdata nr_dev = 0;
 642
 643         if (nr_dev >= SNDRV_CARDS)
 644                 return 0;
 645         (void)(get_option(&str,&enable[nr_dev]) == 2 &&
 646                get_option(&str,&index[nr_dev]) == 2 &&
 647                get_id(&str,&id[nr_dev]) == 2 &&
 648                get_option(&str,&pcm_devs[nr_dev]) == 2 &&
 649                get_option(&str,&pcm_substreams[nr_dev]) == 2);
 650         nr_dev++;
 651         return 1;
 652 }
 653
 654 __setup("snd-dummy=", alsa_card_dummy_setup);
 655
 656 #endif /* ifndef MODULE */