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 static int boot_devs;
 132
 133 module_param_array(index, int, boot_devs, 0444);
 134 MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
 135 module_param_array(id, charp, boot_devs, 0444);
 136 MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
 137 module_param_array(enable, bool, boot_devs, 0444);
 138 MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
 139 module_param_array(pcm_devs, int, boot_devs, 0444);
 140 MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
 141 module_param_array(pcm_substreams, int, boot_devs, 0444);
 142 MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-16) for dummy driver.");
 143 //module_param_array(midi_devs, int, boot_devs, 0444);
 144 //MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
 145
 146 #define MIXER_ADDR_MASTER       0
 147 #define MIXER_ADDR_LINE         1
 148 #define MIXER_ADDR_MIC          2
 149 #define MIXER_ADDR_SYNTH        3
 150 #define MIXER_ADDR_CD           4
 151 #define MIXER_ADDR_LAST         4
 152
 153 typedef struct snd_card_dummy {
 154         snd_card_t *card;
 155         spinlock_t mixer_lock;
 156         int mixer_volume[MIXER_ADDR_LAST+1][2];
 157         int capture_source[MIXER_ADDR_LAST+1][2];
 158 } snd_card_dummy_t;
 159
 160 typedef struct snd_card_dummy_pcm {
 161         snd_card_dummy_t *dummy;
 162         spinlock_t lock;
 163         struct timer_list timer;
 164         unsigned int pcm_size;
 165         unsigned int pcm_count;
 166         unsigned int pcm_bps;           /* bytes per second */
 167         unsigned int pcm_jiffie;        /* bytes per one jiffie */
 168         unsigned int pcm_irq_pos;       /* IRQ position */
 169         unsigned int pcm_buf_pos;       /* position in buffer */
 170         snd_pcm_substream_t *substream;
 171 } snd_card_dummy_pcm_t;
 172
 173 static snd_card_t *snd_dummy_cards[SNDRV_CARDS] = SNDRV_DEFAULT_PTR;
 174
 175
 176 static void snd_card_dummy_pcm_timer_start(snd_pcm_substream_t * substream)
 177 {
 178         snd_pcm_runtime_t *runtime = substream->runtime;
 179         snd_card_dummy_pcm_t *dpcm = runtime->private_data;
 180
 181         dpcm->timer.expires = 1 + jiffies;
 182         add_timer(&dpcm->timer);
 183 }
 184
 185 static void snd_card_dummy_pcm_timer_stop(snd_pcm_substream_t * substream)
 186 {
 187         snd_pcm_runtime_t *runtime = substream->runtime;
 188         snd_card_dummy_pcm_t *dpcm = runtime->private_data;
 189
 190         del_timer(&dpcm->timer);
 191 }
 192
 193 static int snd_card_dummy_playback_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_capture_trigger(snd_pcm_substream_t * substream,
 207                                           int cmd)
 208 {
 209         if (cmd == SNDRV_PCM_TRIGGER_START) {
 210                 snd_card_dummy_pcm_timer_start(substream);
 211         } else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
 212                 snd_card_dummy_pcm_timer_stop(substream);
 213         } else {
 214                 return -EINVAL;
 215         }
 216         return 0;
 217 }
 218
 219 static int snd_card_dummy_pcm_prepare(snd_pcm_substream_t * substream)
 220 {
 221         snd_pcm_runtime_t *runtime = substream->runtime;
 222         snd_card_dummy_pcm_t *dpcm = runtime->private_data;
 223         unsigned int bps;
 224
 225         bps = runtime->rate * runtime->channels;
 226         bps *= snd_pcm_format_width(runtime->format);
 227         bps /= 8;
 228         if (bps <= 0)
 229                 return -EINVAL;
 230         dpcm->pcm_bps = bps;
 231         dpcm->pcm_jiffie = bps / HZ;
 232         dpcm->pcm_size = snd_pcm_lib_buffer_bytes(substream);
 233         dpcm->pcm_count = snd_pcm_lib_period_bytes(substream);
 234         dpcm->pcm_irq_pos = 0;
 235         dpcm->pcm_buf_pos = 0;
 236         return 0;
 237 }
 238
 239 static int snd_card_dummy_playback_prepare(snd_pcm_substream_t * substream)
 240 {
 241         return snd_card_dummy_pcm_prepare(substream);
 242 }
 243
 244 static int snd_card_dummy_capture_prepare(snd_pcm_substream_t * substream)
 245 {
 246         return snd_card_dummy_pcm_prepare(substream);
 247 }
 248
 249 static void snd_card_dummy_pcm_timer_function(unsigned long data)
 250 {
 251         snd_card_dummy_pcm_t *dpcm = (snd_card_dummy_pcm_t *)data;
 252
 253         dpcm->timer.expires = 1 + jiffies;
 254         add_timer(&dpcm->timer);
 255         spin_lock_irq(&dpcm->lock);
 256         dpcm->pcm_irq_pos += dpcm->pcm_jiffie;
 257         dpcm->pcm_buf_pos += dpcm->pcm_jiffie;
 258         dpcm->pcm_buf_pos %= dpcm->pcm_size;
 259         if (dpcm->pcm_irq_pos >= dpcm->pcm_count) {
 260                 dpcm->pcm_irq_pos %= dpcm->pcm_count;
 261                 snd_pcm_period_elapsed(dpcm->substream);
 262         }
 263         spin_unlock_irq(&dpcm->lock);
 264 }
 265
 266 static snd_pcm_uframes_t snd_card_dummy_playback_pointer(snd_pcm_substream_t * substream)
 267 {
 268         snd_pcm_runtime_t *runtime = substream->runtime;
 269         snd_card_dummy_pcm_t *dpcm = runtime->private_data;
 270
 271         return bytes_to_frames(runtime, dpcm->pcm_buf_pos);
 272 }
 273
 274 static snd_pcm_uframes_t snd_card_dummy_capture_pointer(snd_pcm_substream_t * substream)
 275 {
 276         snd_pcm_runtime_t *runtime = substream->runtime;
 277         snd_card_dummy_pcm_t *dpcm = runtime->private_data;
 278
 279         return bytes_to_frames(runtime, dpcm->pcm_buf_pos);
 280 }
 281
 282 static snd_pcm_hardware_t snd_card_dummy_playback =
 283 {
 284         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 285                                  SNDRV_PCM_INFO_MMAP_VALID),
 286         .formats =              USE_FORMATS,
 287         .rates =                USE_RATE,
 288         .rate_min =             USE_RATE_MIN,
 289         .rate_max =             USE_RATE_MAX,
 290         .channels_min =         USE_CHANNELS_MIN,
 291         .channels_max =         USE_CHANNELS_MAX,
 292         .buffer_bytes_max =     MAX_BUFFER_SIZE,
 293         .period_bytes_min =     64,
 294         .period_bytes_max =     MAX_BUFFER_SIZE,
 295         .periods_min =          USE_PERIODS_MIN,
 296         .periods_max =          USE_PERIODS_MAX,
 297         .fifo_size =            0,
 298 };
 299
 300 static snd_pcm_hardware_t snd_card_dummy_capture =
 301 {
 302         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 303                                  SNDRV_PCM_INFO_MMAP_VALID),
 304         .formats =              USE_FORMATS,
 305         .rates =                USE_RATE,
 306         .rate_min =             USE_RATE_MIN,
 307         .rate_max =             USE_RATE_MAX,
 308         .channels_min =         USE_CHANNELS_MIN,
 309         .channels_max =         USE_CHANNELS_MAX,
 310         .buffer_bytes_max =     MAX_BUFFER_SIZE,
 311         .period_bytes_min =     64,
 312         .period_bytes_max =     MAX_BUFFER_SIZE,
 313         .periods_min =          USE_PERIODS_MIN,
 314         .periods_max =          USE_PERIODS_MAX,
 315         .fifo_size =            0,
 316 };
 317
 318 static void snd_card_dummy_runtime_free(snd_pcm_runtime_t *runtime)
 319 {
 320         snd_card_dummy_pcm_t *dpcm = runtime->private_data;
 321         kfree(dpcm);
 322 }
 323
 324 static int snd_card_dummy_hw_params(snd_pcm_substream_t * substream,
 325                                     snd_pcm_hw_params_t * hw_params)
 326 {
 327         return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
 328 }
 329
 330 static int snd_card_dummy_hw_free(snd_pcm_substream_t * substream)
 331 {
 332         return snd_pcm_lib_free_pages(substream);
 333 }
 334
 335 static int snd_card_dummy_playback_open(snd_pcm_substream_t * substream)
 336 {
 337         snd_pcm_runtime_t *runtime = substream->runtime;
 338         snd_card_dummy_pcm_t *dpcm;
 339         int err;
 340
 341         dpcm = kcalloc(1, sizeof(*dpcm), GFP_KERNEL);
 342         if (dpcm == NULL)
 343                 return -ENOMEM;
 344         init_timer(&dpcm->timer);
 345         dpcm->timer.data = (unsigned long) dpcm;
 346         dpcm->timer.function = snd_card_dummy_pcm_timer_function;
 347         spin_lock_init(&dpcm->lock);
 348         dpcm->substream = substream;
 349         runtime->private_data = dpcm;
 350         runtime->private_free = snd_card_dummy_runtime_free;
 351         runtime->hw = snd_card_dummy_playback;
 352         if (substream->pcm->device & 1) {
 353                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 354                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 355         }
 356         if (substream->pcm->device & 2)
 357                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
 358         if ((err = add_playback_constraints(runtime)) < 0) {
 359                 kfree(dpcm);
 360                 return err;
 361         }
 362
 363         return 0;
 364 }
 365
 366 static int snd_card_dummy_capture_open(snd_pcm_substream_t * substream)
 367 {
 368         snd_pcm_runtime_t *runtime = substream->runtime;
 369         snd_card_dummy_pcm_t *dpcm;
 370         int err;
 371
 372         dpcm = kcalloc(1, sizeof(*dpcm), GFP_KERNEL);
 373         if (dpcm == NULL)
 374                 return -ENOMEM;
 375         init_timer(&dpcm->timer);
 376         dpcm->timer.data = (unsigned long) dpcm;
 377         dpcm->timer.function = snd_card_dummy_pcm_timer_function;
 378         spin_lock_init(&dpcm->lock);
 379         dpcm->substream = substream;
 380         runtime->private_data = dpcm;
 381         runtime->private_free = snd_card_dummy_runtime_free;
 382         runtime->hw = snd_card_dummy_capture;
 383         if (substream->pcm->device == 1) {
 384                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 385                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 386         }
 387         if (substream->pcm->device & 2)
 388                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
 389         if ((err = add_capture_constraints(runtime)) < 0) {
 390                 kfree(dpcm);
 391                 return err;
 392         }
 393
 394         return 0;
 395 }
 396
 397 static int snd_card_dummy_playback_close(snd_pcm_substream_t * substream)
 398 {
 399         return 0;
 400 }
 401
 402 static int snd_card_dummy_capture_close(snd_pcm_substream_t * substream)
 403 {
 404         return 0;
 405 }
 406
 407 static snd_pcm_ops_t snd_card_dummy_playback_ops = {
 408         .open =                 snd_card_dummy_playback_open,
 409         .close =                snd_card_dummy_playback_close,
 410         .ioctl =                snd_pcm_lib_ioctl,
 411         .hw_params =            snd_card_dummy_hw_params,
 412         .hw_free =              snd_card_dummy_hw_free,
 413         .prepare =              snd_card_dummy_playback_prepare,
 414         .trigger =              snd_card_dummy_playback_trigger,
 415         .pointer =              snd_card_dummy_playback_pointer,
 416 };
 417
 418 static snd_pcm_ops_t snd_card_dummy_capture_ops = {
 419         .open =                 snd_card_dummy_capture_open,
 420         .close =                snd_card_dummy_capture_close,
 421         .ioctl =                snd_pcm_lib_ioctl,
 422         .hw_params =            snd_card_dummy_hw_params,
 423         .hw_free =              snd_card_dummy_hw_free,
 424         .prepare =              snd_card_dummy_capture_prepare,
 425         .trigger =              snd_card_dummy_capture_trigger,
 426         .pointer =              snd_card_dummy_capture_pointer,
 427 };
 428
 429 static int __init snd_card_dummy_pcm(snd_card_dummy_t *dummy, int device, int substreams)
 430 {
 431         snd_pcm_t *pcm;
 432         int err;
 433
 434         if ((err = snd_pcm_new(dummy->card, "Dummy PCM", device, substreams, substreams, &pcm)) < 0)
 435                 return err;
 436         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_card_dummy_playback_ops);
 437         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_dummy_capture_ops);
 438         pcm->private_data = dummy;
 439         pcm->info_flags = 0;
 440         strcpy(pcm->name, "Dummy PCM");
 441         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
 442                                               snd_dma_continuous_data(GFP_KERNEL),
 443                                               0, 64*1024);
 444         return 0;
 445 }
 446
 447 #define DUMMY_VOLUME(xname, xindex, addr) \
 448 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 449   .info = snd_dummy_volume_info, \
 450   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
 451   .private_value = addr }
 452
 453 static int snd_dummy_volume_info(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo)
 454 {
 455         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 456         uinfo->count = 2;
 457         uinfo->value.integer.min = -50;
 458         uinfo->value.integer.max = 100;
 459         return 0;
 460 }
 461
 462 static int snd_dummy_volume_get(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 463 {
 464         snd_card_dummy_t *dummy = snd_kcontrol_chip(kcontrol);
 465         unsigned long flags;
 466         int addr = kcontrol->private_value;
 467
 468         spin_lock_irqsave(&dummy->mixer_lock, flags);
 469         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
 470         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
 471         spin_unlock_irqrestore(&dummy->mixer_lock, flags);
 472         return 0;
 473 }
 474
 475 static int snd_dummy_volume_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 476 {
 477         snd_card_dummy_t *dummy = snd_kcontrol_chip(kcontrol);
 478         unsigned long flags;
 479         int change, addr = kcontrol->private_value;
 480         int left, right;
 481
 482         left = ucontrol->value.integer.value[0];
 483         if (left < -50)
 484                 left = -50;
 485         if (left > 100)
 486                 left = 100;
 487         right = ucontrol->value.integer.value[1];
 488         if (right < -50)
 489                 right = -50;
 490         if (right > 100)
 491                 right = 100;
 492         spin_lock_irqsave(&dummy->mixer_lock, flags);
 493         change = dummy->mixer_volume[addr][0] != left ||
 494                  dummy->mixer_volume[addr][1] != right;
 495         dummy->mixer_volume[addr][0] = left;
 496         dummy->mixer_volume[addr][1] = right;
 497         spin_unlock_irqrestore(&dummy->mixer_lock, flags);
 498         return change;
 499 }
 500
 501 #define DUMMY_CAPSRC(xname, xindex, addr) \
 502 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 503   .info = snd_dummy_capsrc_info, \
 504   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
 505   .private_value = addr }
 506
 507 static int snd_dummy_capsrc_info(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo)
 508 {
 509         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
 510         uinfo->count = 2;
 511         uinfo->value.integer.min = 0;
 512         uinfo->value.integer.max = 1;
 513         return 0;
 514 }
 515
 516 static int snd_dummy_capsrc_get(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 517 {
 518         snd_card_dummy_t *dummy = snd_kcontrol_chip(kcontrol);
 519         unsigned long flags;
 520         int addr = kcontrol->private_value;
 521
 522         spin_lock_irqsave(&dummy->mixer_lock, flags);
 523         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
 524         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
 525         spin_unlock_irqrestore(&dummy->mixer_lock, flags);
 526         return 0;
 527 }
 528
 529 static int snd_dummy_capsrc_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 530 {
 531         snd_card_dummy_t *dummy = snd_kcontrol_chip(kcontrol);
 532         unsigned long flags;
 533         int change, addr = kcontrol->private_value;
 534         int left, right;
 535
 536         left = ucontrol->value.integer.value[0] & 1;
 537         right = ucontrol->value.integer.value[1] & 1;
 538         spin_lock_irqsave(&dummy->mixer_lock, flags);
 539         change = dummy->capture_source[addr][0] != left &&
 540                  dummy->capture_source[addr][1] != right;
 541         dummy->capture_source[addr][0] = left;
 542         dummy->capture_source[addr][1] = right;
 543         spin_unlock_irqrestore(&dummy->mixer_lock, flags);
 544         return change;
 545 }
 546
 547 static snd_kcontrol_new_t snd_dummy_controls[] = {
 548 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
 549 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
 550 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
 551 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_MASTER),
 552 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
 553 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_MASTER),
 554 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
 555 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MASTER),
 556 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
 557 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_MASTER)
 558 };
 559
 560 int __init snd_card_dummy_new_mixer(snd_card_dummy_t * dummy)
 561 {
 562         snd_card_t *card = dummy->card;
 563         unsigned int idx;
 564         int err;
 565
 566         snd_assert(dummy != NULL, return -EINVAL);
 567         spin_lock_init(&dummy->mixer_lock);
 568         strcpy(card->mixername, "Dummy Mixer");
 569
 570         for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
 571                 if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy))) < 0)
 572                         return err;
 573         }
 574         return 0;
 575 }
 576
 577 static int __init snd_card_dummy_probe(int dev)
 578 {
 579         snd_card_t *card;
 580         struct snd_card_dummy *dummy;
 581         int idx, err;
 582
 583         if (!enable[dev])
 584                 return -ENODEV;
 585         card = snd_card_new(index[dev], id[dev], THIS_MODULE,
 586                             sizeof(struct snd_card_dummy));
 587         if (card == NULL)
 588                 return -ENOMEM;
 589         dummy = (struct snd_card_dummy *)card->private_data;
 590         dummy->card = card;
 591         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
 592                 if (pcm_substreams[dev] < 1)
 593                         pcm_substreams[dev] = 1;
 594                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
 595                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
 596                 if ((err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev])) < 0)
 597                         goto __nodev;
 598         }
 599         if ((err = snd_card_dummy_new_mixer(dummy)) < 0)
 600                 goto __nodev;
 601         strcpy(card->driver, "Dummy");
 602         strcpy(card->shortname, "Dummy");
 603         sprintf(card->longname, "Dummy %i", dev + 1);
 604         if ((err = snd_card_register(card)) == 0) {
 605                 snd_dummy_cards[dev] = card;
 606                 return 0;
 607         }
 608       __nodev:
 609         snd_card_free(card);
 610         return err;
 611 }
 612
 613 static int __init alsa_card_dummy_init(void)
 614 {
 615         int dev, cards;
 616
 617         for (dev = cards = 0; dev < SNDRV_CARDS && enable[dev]; dev++) {
 618                 if (snd_card_dummy_probe(dev) < 0) {
 619 #ifdef MODULE
 620                         printk(KERN_ERR "Dummy soundcard #%i not found or device busy\n", dev + 1);
 621 #endif
 622                         break;
 623                 }
 624                 cards++;
 625         }
 626         if (!cards) {
 627 #ifdef MODULE
 628                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
 629 #endif
 630                 return -ENODEV;
 631         }
 632         return 0;
 633 }
 634
 635 static void __exit alsa_card_dummy_exit(void)
 636 {
 637         int idx;
 638
 639         for (idx = 0; idx < SNDRV_CARDS; idx++)
 640                 snd_card_free(snd_dummy_cards[idx]);
 641 }
 642
 643 module_init(alsa_card_dummy_init)
 644 module_exit(alsa_card_dummy_exit)