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
  73 /* defaults */
  74 #ifndef MAX_BUFFER_SIZE
  75 #define MAX_BUFFER_SIZE         (64*1024)
  76 #endif
  77 #ifndef USE_FORMATS
  78 #define USE_FORMATS             (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)
  79 #endif
  80 #ifndef USE_CHANNELS_MIN
  81 #define USE_CHANNELS_MIN        1
  82 #endif
  83 #ifndef USE_CHANNELS_MAX
  84 #define USE_CHANNELS_MAX        2
  85 #endif
  86 #ifndef USE_PERIODS_MIN
  87 #define USE_PERIODS_MIN         1
  88 #endif
  89 #ifndef USE_PERIODS_MAX
  90 #define USE_PERIODS_MAX         1024
  91 #endif
  92
  93 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
  94 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
  95 static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
  96 static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
  97 static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
  98 //static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
  99
 100 MODULE_PARM(index, "1-" __MODULE_STRING(SNDRV_CARDS) "i");
 101 MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
 102 MODULE_PARM_SYNTAX(index, SNDRV_INDEX_DESC);
 103 MODULE_PARM(id, "1-" __MODULE_STRING(SNDRV_CARDS) "s");
 104 MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
 105 MODULE_PARM_SYNTAX(id, SNDRV_ID_DESC);
 106 MODULE_PARM(enable, "1-" __MODULE_STRING(SNDRV_CARDS) "i");
 107 MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
 108 MODULE_PARM_SYNTAX(enable, SNDRV_ENABLE_DESC);
 109 MODULE_PARM(pcm_devs, "1-" __MODULE_STRING(SNDRV_CARDS) "i");
 110 MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
 111 MODULE_PARM_SYNTAX(pcm_devs, SNDRV_ENABLED ",allows:{{0,4}},default:1,dialog:list");
 112 MODULE_PARM(pcm_substreams, "1-" __MODULE_STRING(SNDRV_CARDS) "i");
 113 MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-16) for dummy driver.");
 114 MODULE_PARM_SYNTAX(pcm_substreams, SNDRV_ENABLED ",allows:{{1,16}},default:8,dialog:list");
 115 //MODULE_PARM(midi_devs, "1-" __MODULE_STRING(SNDRV_CARDS) "i");
 116 //MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
 117 //MODULE_PARM_SYNTAX(midi_devs, SNDRV_ENABLED ",allows:{{0,2}},default:8,dialog:list");
 118
 119 #define MIXER_ADDR_MASTER       0
 120 #define MIXER_ADDR_LINE         1
 121 #define MIXER_ADDR_MIC          2
 122 #define MIXER_ADDR_SYNTH        3
 123 #define MIXER_ADDR_CD           4
 124 #define MIXER_ADDR_LAST         4
 125
 126 typedef struct snd_card_dummy {
 127         snd_card_t *card;
 128         spinlock_t mixer_lock;
 129         int mixer_volume[MIXER_ADDR_LAST+1][2];
 130         int capture_source[MIXER_ADDR_LAST+1][2];
 131 } snd_card_dummy_t;
 132
 133 typedef struct snd_card_dummy_pcm {
 134         snd_card_dummy_t *dummy;
 135         spinlock_t lock;
 136         struct timer_list timer;
 137         unsigned int pcm_size;
 138         unsigned int pcm_count;
 139         unsigned int pcm_bps;           /* bytes per second */
 140         unsigned int pcm_jiffie;        /* bytes per one jiffie */
 141         unsigned int pcm_irq_pos;       /* IRQ position */
 142         unsigned int pcm_buf_pos;       /* position in buffer */
 143         snd_pcm_substream_t *substream;
 144 } snd_card_dummy_pcm_t;
 145
 146 static snd_card_t *snd_dummy_cards[SNDRV_CARDS] = SNDRV_DEFAULT_PTR;
 147
 148
 149 static int snd_card_dummy_playback_ioctl(snd_pcm_substream_t * substream,
 150                                          unsigned int cmd,
 151                                          void *arg)
 152 {
 153         return snd_pcm_lib_ioctl(substream, cmd, arg);
 154 }
 155
 156 static int snd_card_dummy_capture_ioctl(snd_pcm_substream_t * substream,
 157                                         unsigned int cmd,
 158                                         void *arg)
 159 {
 160         return snd_pcm_lib_ioctl(substream, cmd, arg);
 161 }
 162
 163 static void snd_card_dummy_pcm_timer_start(snd_pcm_substream_t * substream)
 164 {
 165         snd_pcm_runtime_t *runtime = substream->runtime;
 166         snd_card_dummy_pcm_t *dpcm = snd_magic_cast(snd_card_dummy_pcm_t, runtime->private_data, return);
 167
 168         dpcm->timer.expires = 1 + jiffies;
 169         add_timer(&dpcm->timer);
 170 }
 171
 172 static void snd_card_dummy_pcm_timer_stop(snd_pcm_substream_t * substream)
 173 {
 174         snd_pcm_runtime_t *runtime = substream->runtime;
 175         snd_card_dummy_pcm_t *dpcm = snd_magic_cast(snd_card_dummy_pcm_t, runtime->private_data, return);
 176
 177         del_timer(&dpcm->timer);
 178 }
 179
 180 static int snd_card_dummy_playback_trigger(snd_pcm_substream_t * substream,
 181                                            int cmd)
 182 {
 183         if (cmd == SNDRV_PCM_TRIGGER_START) {
 184                 snd_card_dummy_pcm_timer_start(substream);
 185         } else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
 186                 snd_card_dummy_pcm_timer_stop(substream);
 187         } else {
 188                 return -EINVAL;
 189         }
 190         return 0;
 191 }
 192
 193 static int snd_card_dummy_capture_trigger(snd_pcm_substream_t * substream,
 194                                           int cmd)
 195 {
 196         if (cmd == SNDRV_PCM_TRIGGER_START) {
 197                 snd_card_dummy_pcm_timer_start(substream);
 198         } else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
 199                 snd_card_dummy_pcm_timer_stop(substream);
 200         } else {
 201                 return -EINVAL;
 202         }
 203         return 0;
 204 }
 205
 206 static int snd_card_dummy_pcm_prepare(snd_pcm_substream_t * substream)
 207 {
 208         snd_pcm_runtime_t *runtime = substream->runtime;
 209         snd_card_dummy_pcm_t *dpcm = snd_magic_cast(snd_card_dummy_pcm_t, runtime->private_data, return -ENXIO);
 210         unsigned int bps;
 211
 212         bps = runtime->rate * runtime->channels;
 213         bps *= snd_pcm_format_width(runtime->format);
 214         bps /= 8;
 215         if (bps <= 0)
 216                 return -EINVAL;
 217         dpcm->pcm_bps = bps;
 218         dpcm->pcm_jiffie = bps / HZ;
 219         dpcm->pcm_size = snd_pcm_lib_buffer_bytes(substream);
 220         dpcm->pcm_count = snd_pcm_lib_period_bytes(substream);
 221         dpcm->pcm_irq_pos = 0;
 222         dpcm->pcm_buf_pos = 0;
 223         return 0;
 224 }
 225
 226 static int snd_card_dummy_playback_prepare(snd_pcm_substream_t * substream)
 227 {
 228         return snd_card_dummy_pcm_prepare(substream);
 229 }
 230
 231 static int snd_card_dummy_capture_prepare(snd_pcm_substream_t * substream)
 232 {
 233         return snd_card_dummy_pcm_prepare(substream);
 234 }
 235
 236 static void snd_card_dummy_pcm_timer_function(unsigned long data)
 237 {
 238         snd_card_dummy_pcm_t *dpcm = snd_magic_cast(snd_card_dummy_pcm_t, (void *)data, return);
 239
 240         dpcm->timer.expires = 1 + jiffies;
 241         add_timer(&dpcm->timer);
 242         spin_lock_irq(&dpcm->lock);
 243         dpcm->pcm_irq_pos += dpcm->pcm_jiffie;
 244         dpcm->pcm_buf_pos += dpcm->pcm_jiffie;
 245         dpcm->pcm_buf_pos %= dpcm->pcm_size;
 246         if (dpcm->pcm_irq_pos >= dpcm->pcm_count) {
 247                 dpcm->pcm_irq_pos %= dpcm->pcm_count;
 248                 snd_pcm_period_elapsed(dpcm->substream);
 249         }
 250         spin_unlock_irq(&dpcm->lock);
 251 }
 252
 253 static snd_pcm_uframes_t snd_card_dummy_playback_pointer(snd_pcm_substream_t * substream)
 254 {
 255         snd_pcm_runtime_t *runtime = substream->runtime;
 256         snd_card_dummy_pcm_t *dpcm = snd_magic_cast(snd_card_dummy_pcm_t, runtime->private_data, return -ENXIO);
 257
 258         return bytes_to_frames(runtime, dpcm->pcm_buf_pos);
 259 }
 260
 261 static snd_pcm_uframes_t snd_card_dummy_capture_pointer(snd_pcm_substream_t * substream)
 262 {
 263         snd_pcm_runtime_t *runtime = substream->runtime;
 264         snd_card_dummy_pcm_t *dpcm = snd_magic_cast(snd_card_dummy_pcm_t, runtime->private_data, return -ENXIO);
 265
 266         return bytes_to_frames(runtime, dpcm->pcm_buf_pos);
 267 }
 268
 269 static snd_pcm_hardware_t snd_card_dummy_playback =
 270 {
 271         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 272                                  SNDRV_PCM_INFO_MMAP_VALID),
 273         .formats =              USE_FORMATS,
 274         .rates =                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
 275         .rate_min =             5500,
 276         .rate_max =             48000,
 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 snd_pcm_hardware_t snd_card_dummy_capture =
 288 {
 289         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 290                                  SNDRV_PCM_INFO_MMAP_VALID),
 291         .formats =              USE_FORMATS,
 292         .rates =                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
 293         .rate_min =             5500,
 294         .rate_max =             48000,
 295         .channels_min =         USE_CHANNELS_MIN,
 296         .channels_max =         USE_CHANNELS_MAX,
 297         .buffer_bytes_max =     MAX_BUFFER_SIZE,
 298         .period_bytes_min =     64,
 299         .period_bytes_max =     MAX_BUFFER_SIZE,
 300         .periods_min =          USE_PERIODS_MIN,
 301         .periods_max =          USE_PERIODS_MAX,
 302         .fifo_size =            0,
 303 };
 304
 305 static void snd_card_dummy_runtime_free(snd_pcm_runtime_t *runtime)
 306 {
 307         snd_card_dummy_pcm_t *dpcm = snd_magic_cast(snd_card_dummy_pcm_t, runtime->private_data, return);
 308         snd_magic_kfree(dpcm);
 309 }
 310
 311 static int snd_card_dummy_playback_open(snd_pcm_substream_t * substream)
 312 {
 313         snd_pcm_runtime_t *runtime = substream->runtime;
 314         snd_card_dummy_pcm_t *dpcm;
 315
 316         dpcm = snd_magic_kcalloc(snd_card_dummy_pcm_t, 0, GFP_KERNEL);
 317         if (dpcm == NULL)
 318                 return -ENOMEM;
 319         if ((runtime->dma_area = snd_malloc_pages_fallback(MAX_BUFFER_SIZE, GFP_KERNEL, &runtime->dma_bytes)) == NULL) {
 320                 snd_magic_kfree(dpcm);
 321                 return -ENOMEM;
 322         }
 323         init_timer(&dpcm->timer);
 324         dpcm->timer.data = (unsigned long) dpcm;
 325         dpcm->timer.function = snd_card_dummy_pcm_timer_function;
 326         spin_lock_init(&dpcm->lock);
 327         dpcm->substream = substream;
 328         runtime->private_data = dpcm;
 329         runtime->private_free = snd_card_dummy_runtime_free;
 330         runtime->hw = snd_card_dummy_playback;
 331         if (substream->pcm->device & 1) {
 332                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 333                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 334         }
 335         if (substream->pcm->device & 2)
 336                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
 337         return 0;
 338 }
 339
 340 static int snd_card_dummy_capture_open(snd_pcm_substream_t * substream)
 341 {
 342         snd_pcm_runtime_t *runtime = substream->runtime;
 343         snd_card_dummy_pcm_t *dpcm;
 344
 345         dpcm = snd_magic_kcalloc(snd_card_dummy_pcm_t, 0, GFP_KERNEL);
 346         if (dpcm == NULL)
 347                 return -ENOMEM;
 348         if ((runtime->dma_area = snd_malloc_pages_fallback(MAX_BUFFER_SIZE, GFP_KERNEL, &runtime->dma_bytes)) == NULL) {
 349                 snd_magic_kfree(dpcm);
 350                 return -ENOMEM;
 351         }
 352         memset(runtime->dma_area, 0, runtime->dma_bytes);
 353         init_timer(&dpcm->timer);
 354         dpcm->timer.data = (unsigned long) dpcm;
 355         dpcm->timer.function = snd_card_dummy_pcm_timer_function;
 356         spin_lock_init(&dpcm->lock);
 357         dpcm->substream = substream;
 358         runtime->private_data = dpcm;
 359         runtime->private_free = snd_card_dummy_runtime_free;
 360         runtime->hw = snd_card_dummy_capture;
 361         if (substream->pcm->device == 1) {
 362                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 363                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 364         }
 365         if (substream->pcm->device & 2)
 366                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
 367         return 0;
 368 }
 369
 370 static int snd_card_dummy_playback_close(snd_pcm_substream_t * substream)
 371 {
 372         snd_pcm_runtime_t *runtime = substream->runtime;
 373
 374         snd_free_pages(runtime->dma_area, runtime->dma_bytes);
 375         return 0;
 376 }
 377
 378 static int snd_card_dummy_capture_close(snd_pcm_substream_t * substream)
 379 {
 380         snd_pcm_runtime_t *runtime = substream->runtime;
 381
 382         snd_free_pages(runtime->dma_area, runtime->dma_bytes);
 383         return 0;
 384 }
 385
 386 static snd_pcm_ops_t snd_card_dummy_playback_ops = {
 387         .open =                 snd_card_dummy_playback_open,
 388         .close =                snd_card_dummy_playback_close,
 389         .ioctl =                snd_card_dummy_playback_ioctl,
 390         .prepare =              snd_card_dummy_playback_prepare,
 391         .trigger =              snd_card_dummy_playback_trigger,
 392         .pointer =              snd_card_dummy_playback_pointer,
 393 };
 394
 395 static snd_pcm_ops_t snd_card_dummy_capture_ops = {
 396         .open =                 snd_card_dummy_capture_open,
 397         .close =                snd_card_dummy_capture_close,
 398         .ioctl =                snd_card_dummy_capture_ioctl,
 399         .prepare =              snd_card_dummy_capture_prepare,
 400         .trigger =              snd_card_dummy_capture_trigger,
 401         .pointer =              snd_card_dummy_capture_pointer,
 402 };
 403
 404 static int __init snd_card_dummy_pcm(snd_card_dummy_t *dummy, int device, int substreams)
 405 {
 406         snd_pcm_t *pcm;
 407         int err;
 408
 409         if ((err = snd_pcm_new(dummy->card, "Dummy PCM", device, substreams, substreams, &pcm)) < 0)
 410                 return err;
 411         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_card_dummy_playback_ops);
 412         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_dummy_capture_ops);
 413         pcm->private_data = dummy;
 414         pcm->info_flags = 0;
 415         strcpy(pcm->name, "Dummy PCM");
 416         return 0;
 417 }
 418
 419 #define DUMMY_VOLUME(xname, xindex, addr) \
 420 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 421   .info = snd_dummy_volume_info, \
 422   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
 423   .private_value = addr }
 424
 425 static int snd_dummy_volume_info(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo)
 426 {
 427         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 428         uinfo->count = 2;
 429         uinfo->value.integer.min = -50;
 430         uinfo->value.integer.max = 100;
 431         return 0;
 432 }
 433
 434 static int snd_dummy_volume_get(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 435 {
 436         snd_card_dummy_t *dummy = _snd_kcontrol_chip(kcontrol);
 437         unsigned long flags;
 438         int addr = kcontrol->private_value;
 439
 440         spin_lock_irqsave(&dummy->mixer_lock, flags);
 441         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
 442         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
 443         spin_unlock_irqrestore(&dummy->mixer_lock, flags);
 444         return 0;
 445 }
 446
 447 static int snd_dummy_volume_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 448 {
 449         snd_card_dummy_t *dummy = _snd_kcontrol_chip(kcontrol);
 450         unsigned long flags;
 451         int change, addr = kcontrol->private_value;
 452         int left, right;
 453
 454         left = ucontrol->value.integer.value[0];
 455         if (left < -50)
 456                 left = -50;
 457         if (left > 100)
 458                 left = 100;
 459         right = ucontrol->value.integer.value[1];
 460         if (right < -50)
 461                 right = -50;
 462         if (right > 100)
 463                 right = 100;
 464         spin_lock_irqsave(&dummy->mixer_lock, flags);
 465         change = dummy->mixer_volume[addr][0] != left ||
 466                  dummy->mixer_volume[addr][1] != right;
 467         dummy->mixer_volume[addr][0] = left;
 468         dummy->mixer_volume[addr][1] = right;
 469         spin_unlock_irqrestore(&dummy->mixer_lock, flags);
 470         return change;
 471 }
 472
 473 #define DUMMY_CAPSRC(xname, xindex, addr) \
 474 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 475   .info = snd_dummy_capsrc_info, \
 476   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
 477   .private_value = addr }
 478
 479 static int snd_dummy_capsrc_info(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo)
 480 {
 481         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
 482         uinfo->count = 2;
 483         uinfo->value.integer.min = 0;
 484         uinfo->value.integer.max = 1;
 485         return 0;
 486 }
 487
 488 static int snd_dummy_capsrc_get(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 489 {
 490         snd_card_dummy_t *dummy = _snd_kcontrol_chip(kcontrol);
 491         unsigned long flags;
 492         int addr = kcontrol->private_value;
 493
 494         spin_lock_irqsave(&dummy->mixer_lock, flags);
 495         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
 496         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
 497         spin_unlock_irqrestore(&dummy->mixer_lock, flags);
 498         return 0;
 499 }
 500
 501 static int snd_dummy_capsrc_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 502 {
 503         snd_card_dummy_t *dummy = _snd_kcontrol_chip(kcontrol);
 504         unsigned long flags;
 505         int change, addr = kcontrol->private_value;
 506         int left, right;
 507
 508         left = ucontrol->value.integer.value[0] & 1;
 509         right = ucontrol->value.integer.value[1] & 1;
 510         spin_lock_irqsave(&dummy->mixer_lock, flags);
 511         change = dummy->capture_source[addr][0] != left &&
 512                  dummy->capture_source[addr][1] != right;
 513         dummy->capture_source[addr][0] = left;
 514         dummy->capture_source[addr][1] = right;
 515         spin_unlock_irqrestore(&dummy->mixer_lock, flags);
 516         return change;
 517 }
 518
 519 #define DUMMY_CONTROLS (sizeof(snd_dummy_controls)/sizeof(snd_kcontrol_new_t))
 520
 521 static snd_kcontrol_new_t snd_dummy_controls[] = {
 522 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
 523 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
 524 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
 525 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_MASTER),
 526 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
 527 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_MASTER),
 528 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
 529 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MASTER),
 530 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
 531 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_MASTER)
 532 };
 533
 534 int __init snd_card_dummy_new_mixer(snd_card_dummy_t * dummy)
 535 {
 536         snd_card_t *card = dummy->card;
 537         unsigned int idx;
 538         int err;
 539
 540         snd_assert(dummy != NULL, return -EINVAL);
 541         spin_lock_init(&dummy->mixer_lock);
 542         strcpy(card->mixername, "Dummy Mixer");
 543
 544         for (idx = 0; idx < DUMMY_CONTROLS; idx++) {
 545                 if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy))) < 0)
 546                         return err;
 547         }
 548         return 0;
 549 }
 550
 551 static int __init snd_card_dummy_probe(int dev)
 552 {
 553         snd_card_t *card;
 554         struct snd_card_dummy *dummy;
 555         int idx, err;
 556
 557         if (!enable[dev])
 558                 return -ENODEV;
 559         card = snd_card_new(index[dev], id[dev], THIS_MODULE,
 560                             sizeof(struct snd_card_dummy));
 561         if (card == NULL)
 562                 return -ENOMEM;
 563         dummy = (struct snd_card_dummy *)card->private_data;
 564         dummy->card = card;
 565         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
 566                 if (pcm_substreams[dev] < 1)
 567                         pcm_substreams[dev] = 1;
 568                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
 569                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
 570                 if ((err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev])) < 0)
 571                         goto __nodev;
 572         }
 573         if ((err = snd_card_dummy_new_mixer(dummy)) < 0)
 574                 goto __nodev;
 575         strcpy(card->driver, "Dummy");
 576         strcpy(card->shortname, "Dummy");
 577         sprintf(card->longname, "Dummy %i", dev + 1);
 578         if ((err = snd_card_register(card)) == 0) {
 579                 snd_dummy_cards[dev] = card;
 580                 return 0;
 581         }
 582       __nodev:
 583         snd_card_free(card);
 584         return err;
 585 }
 586
 587 static int __init alsa_card_dummy_init(void)
 588 {
 589         int dev, cards;
 590
 591         for (dev = cards = 0; dev < SNDRV_CARDS && enable[dev]; dev++) {
 592                 if (snd_card_dummy_probe(dev) < 0) {
 593 #ifdef MODULE
 594                         printk(KERN_ERR "Dummy soundcard #%i not found or device busy\n", dev + 1);
 595 #endif
 596                         break;
 597                 }
 598                 cards++;
 599         }
 600         if (!cards) {
 601 #ifdef MODULE
 602                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
 603 #endif
 604                 return -ENODEV;
 605         }
 606         return 0;
 607 }
 608
 609 static void __exit alsa_card_dummy_exit(void)
 610 {
 611         int idx;
 612
 613         for (idx = 0; idx < SNDRV_CARDS; idx++)
 614                 snd_card_free(snd_dummy_cards[idx]);
 615 }
 616
 617 module_init(alsa_card_dummy_init)
 618 module_exit(alsa_card_dummy_exit)
 619
 620 #ifndef MODULE
 621
 622 /* format is: snd-dummy=enable,index,id,
 623                         pcm_devs,pcm_substreams */
 624
 625 static int __init alsa_card_dummy_setup(char *str)
 626 {
 627         static unsigned __initdata nr_dev = 0;
 628
 629         if (nr_dev >= SNDRV_CARDS)
 630                 return 0;
 631         (void)(get_option(&str,&enable[nr_dev]) == 2 &&
 632                get_option(&str,&index[nr_dev]) == 2 &&
 633                get_id(&str,&id[nr_dev]) == 2 &&
 634                get_option(&str,&pcm_devs[nr_dev]) == 2 &&
 635                get_option(&str,&pcm_substreams[nr_dev]) == 2);
 636         nr_dev++;
 637         return 1;
 638 }
 639
 640 __setup("snd-dummy=", alsa_card_dummy_setup);
 641
 642 #endif /* ifndef MODULE */