SAFE public projects git trees. - safe/jmp/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/err.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/jiffies.h>
  26 #include <linux/slab.h>
  27 #include <linux/time.h>
  28 #include <linux/wait.h>
  29 #include <linux/moduleparam.h>
  30 #include <sound/core.h>
  31 #include <sound/control.h>
  32 #include <sound/pcm.h>
  33 #include <sound/rawmidi.h>
  34 #include <sound/initval.h>
  35
  36 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
  37 MODULE_DESCRIPTION("Dummy soundcard (/dev/null)");
  38 MODULE_LICENSE("GPL");
  39 MODULE_SUPPORTED_DEVICE("{{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 /* emu10k1 emulation */
  46 #define MAX_BUFFER_SIZE         (128 * 1024)
  47 static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime)
  48 {
  49         int err;
  50         if ((err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
  51                 return err;
  52         if ((err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX)) < 0)
  53                 return err;
  54         return 0;
  55 }
  56 #define add_playback_constraints emu10k1_playback_constraints
  57 #endif
  58
  59 #if 0 /* RME9652 emulation */
  60 #define MAX_BUFFER_SIZE         (26 * 64 * 1024)
  61 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
  62 #define USE_CHANNELS_MIN        26
  63 #define USE_CHANNELS_MAX        26
  64 #define USE_PERIODS_MIN         2
  65 #define USE_PERIODS_MAX         2
  66 #endif
  67
  68 #if 0 /* ICE1712 emulation */
  69 #define MAX_BUFFER_SIZE         (256 * 1024)
  70 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
  71 #define USE_CHANNELS_MIN        10
  72 #define USE_CHANNELS_MAX        10
  73 #define USE_PERIODS_MIN         1
  74 #define USE_PERIODS_MAX         1024
  75 #endif
  76
  77 #if 0 /* UDA1341 emulation */
  78 #define MAX_BUFFER_SIZE         (16380)
  79 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
  80 #define USE_CHANNELS_MIN        2
  81 #define USE_CHANNELS_MAX        2
  82 #define USE_PERIODS_MIN         2
  83 #define USE_PERIODS_MAX         255
  84 #endif
  85
  86 #if 0 /* simple AC97 bridge (intel8x0) with 48kHz AC97 only codec */
  87 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
  88 #define USE_CHANNELS_MIN        2
  89 #define USE_CHANNELS_MAX        2
  90 #define USE_RATE                SNDRV_PCM_RATE_48000
  91 #define USE_RATE_MIN            48000
  92 #define USE_RATE_MAX            48000
  93 #endif
  94
  95
  96 /* defaults */
  97 #ifndef MAX_BUFFER_SIZE
  98 #define MAX_BUFFER_SIZE         (64*1024)
  99 #endif
 100 #ifndef USE_FORMATS
 101 #define USE_FORMATS             (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)
 102 #endif
 103 #ifndef USE_RATE
 104 #define USE_RATE                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000
 105 #define USE_RATE_MIN            5500
 106 #define USE_RATE_MAX            48000
 107 #endif
 108 #ifndef USE_CHANNELS_MIN
 109 #define USE_CHANNELS_MIN        1
 110 #endif
 111 #ifndef USE_CHANNELS_MAX
 112 #define USE_CHANNELS_MAX        2
 113 #endif
 114 #ifndef USE_PERIODS_MIN
 115 #define USE_PERIODS_MIN         1
 116 #endif
 117 #ifndef USE_PERIODS_MAX
 118 #define USE_PERIODS_MAX         1024
 119 #endif
 120 #ifndef add_playback_constraints
 121 #define add_playback_constraints(x) 0
 122 #endif
 123 #ifndef add_capture_constraints
 124 #define add_capture_constraints(x) 0
 125 #endif
 126
 127 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
 128 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
 129 static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
 130 static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
 131 static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
 132 //static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
 133
 134 module_param_array(index, int, NULL, 0444);
 135 MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
 136 module_param_array(id, charp, NULL, 0444);
 137 MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
 138 module_param_array(enable, bool, NULL, 0444);
 139 MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
 140 module_param_array(pcm_devs, int, NULL, 0444);
 141 MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
 142 module_param_array(pcm_substreams, int, NULL, 0444);
 143 MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-16) for dummy driver.");
 144 //module_param_array(midi_devs, int, NULL, 0444);
 145 //MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
 146
 147 #define MIXER_ADDR_MASTER       0
 148 #define MIXER_ADDR_LINE         1
 149 #define MIXER_ADDR_MIC          2
 150 #define MIXER_ADDR_SYNTH        3
 151 #define MIXER_ADDR_CD           4
 152 #define MIXER_ADDR_LAST         4
 153
 154 struct snd_dummy {
 155         struct snd_card *card;
 156         struct snd_pcm *pcm;
 157         spinlock_t mixer_lock;
 158         int mixer_volume[MIXER_ADDR_LAST+1][2];
 159         int capture_source[MIXER_ADDR_LAST+1][2];
 160 };
 161
 162 struct snd_dummy_pcm {
 163         struct snd_dummy *dummy;
 164         spinlock_t lock;
 165         struct timer_list timer;
 166         unsigned int pcm_size;
 167         unsigned int pcm_count;
 168         unsigned int pcm_bps;           /* bytes per second */
 169         unsigned int pcm_jiffie;        /* bytes per one jiffie */
 170         unsigned int pcm_irq_pos;       /* IRQ position */
 171         unsigned int pcm_buf_pos;       /* position in buffer */
 172         struct snd_pcm_substream *substream;
 173 };
 174
 175
 176 static inline void snd_card_dummy_pcm_timer_start(struct snd_dummy_pcm *dpcm)
 177 {
 178         dpcm->timer.expires = 1 + jiffies;
 179         add_timer(&dpcm->timer);
 180 }
 181
 182 static inline void snd_card_dummy_pcm_timer_stop(struct snd_dummy_pcm *dpcm)
 183 {
 184         del_timer(&dpcm->timer);
 185 }
 186
 187 static int snd_card_dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 188 {
 189         struct snd_pcm_runtime *runtime = substream->runtime;
 190         struct snd_dummy_pcm *dpcm = runtime->private_data;
 191         int err = 0;
 192
 193         spin_lock(&dpcm->lock);
 194         switch (cmd) {
 195         case SNDRV_PCM_TRIGGER_START:
 196         case SNDRV_PCM_TRIGGER_RESUME:
 197                 snd_card_dummy_pcm_timer_start(dpcm);
 198                 break;
 199         case SNDRV_PCM_TRIGGER_STOP:
 200         case SNDRV_PCM_TRIGGER_SUSPEND:
 201                 snd_card_dummy_pcm_timer_stop(dpcm);
 202                 break;
 203         default:
 204                 err = -EINVAL;
 205                 break;
 206         }
 207         spin_unlock(&dpcm->lock);
 208         return 0;
 209 }
 210
 211 static int snd_card_dummy_pcm_prepare(struct snd_pcm_substream *substream)
 212 {
 213         struct snd_pcm_runtime *runtime = substream->runtime;
 214         struct snd_dummy_pcm *dpcm = runtime->private_data;
 215         unsigned int bps;
 216
 217         bps = runtime->rate * runtime->channels;
 218         bps *= snd_pcm_format_width(runtime->format);
 219         bps /= 8;
 220         if (bps <= 0)
 221                 return -EINVAL;
 222         dpcm->pcm_bps = bps;
 223         dpcm->pcm_jiffie = bps / HZ;
 224         dpcm->pcm_size = snd_pcm_lib_buffer_bytes(substream);
 225         dpcm->pcm_count = snd_pcm_lib_period_bytes(substream);
 226         dpcm->pcm_irq_pos = 0;
 227         dpcm->pcm_buf_pos = 0;
 228         return 0;
 229 }
 230
 231 static void snd_card_dummy_pcm_timer_function(unsigned long data)
 232 {
 233         struct snd_dummy_pcm *dpcm = (struct snd_dummy_pcm *)data;
 234         unsigned long flags;
 235
 236         spin_lock_irqsave(&dpcm->lock, flags);
 237         dpcm->timer.expires = 1 + jiffies;
 238         add_timer(&dpcm->timer);
 239         dpcm->pcm_irq_pos += dpcm->pcm_jiffie;
 240         dpcm->pcm_buf_pos += dpcm->pcm_jiffie;
 241         dpcm->pcm_buf_pos %= dpcm->pcm_size;
 242         if (dpcm->pcm_irq_pos >= dpcm->pcm_count) {
 243                 dpcm->pcm_irq_pos %= dpcm->pcm_count;
 244                 spin_unlock_irqrestore(&dpcm->lock, flags);
 245                 snd_pcm_period_elapsed(dpcm->substream);
 246         } else
 247                 spin_unlock_irqrestore(&dpcm->lock, flags);
 248 }
 249
 250 static snd_pcm_uframes_t snd_card_dummy_pcm_pointer(struct snd_pcm_substream *substream)
 251 {
 252         struct snd_pcm_runtime *runtime = substream->runtime;
 253         struct snd_dummy_pcm *dpcm = runtime->private_data;
 254
 255         return bytes_to_frames(runtime, dpcm->pcm_buf_pos);
 256 }
 257
 258 static struct snd_pcm_hardware snd_card_dummy_playback =
 259 {
 260         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 261                                  SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
 262         .formats =              USE_FORMATS,
 263         .rates =                USE_RATE,
 264         .rate_min =             USE_RATE_MIN,
 265         .rate_max =             USE_RATE_MAX,
 266         .channels_min =         USE_CHANNELS_MIN,
 267         .channels_max =         USE_CHANNELS_MAX,
 268         .buffer_bytes_max =     MAX_BUFFER_SIZE,
 269         .period_bytes_min =     64,
 270         .period_bytes_max =     MAX_BUFFER_SIZE,
 271         .periods_min =          USE_PERIODS_MIN,
 272         .periods_max =          USE_PERIODS_MAX,
 273         .fifo_size =            0,
 274 };
 275
 276 static struct snd_pcm_hardware snd_card_dummy_capture =
 277 {
 278         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 279                                  SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
 280         .formats =              USE_FORMATS,
 281         .rates =                USE_RATE,
 282         .rate_min =             USE_RATE_MIN,
 283         .rate_max =             USE_RATE_MAX,
 284         .channels_min =         USE_CHANNELS_MIN,
 285         .channels_max =         USE_CHANNELS_MAX,
 286         .buffer_bytes_max =     MAX_BUFFER_SIZE,
 287         .period_bytes_min =     64,
 288         .period_bytes_max =     MAX_BUFFER_SIZE,
 289         .periods_min =          USE_PERIODS_MIN,
 290         .periods_max =          USE_PERIODS_MAX,
 291         .fifo_size =            0,
 292 };
 293
 294 static void snd_card_dummy_runtime_free(struct snd_pcm_runtime *runtime)
 295 {
 296         kfree(runtime->private_data);
 297 }
 298
 299 static int snd_card_dummy_hw_params(struct snd_pcm_substream *substream,
 300                                     struct snd_pcm_hw_params *hw_params)
 301 {
 302         return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
 303 }
 304
 305 static int snd_card_dummy_hw_free(struct snd_pcm_substream *substream)
 306 {
 307         return snd_pcm_lib_free_pages(substream);
 308 }
 309
 310 static struct snd_dummy_pcm *new_pcm_stream(struct snd_pcm_substream *substream)
 311 {
 312         struct snd_dummy_pcm *dpcm;
 313
 314         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
 315         if (! dpcm)
 316                 return dpcm;
 317         init_timer(&dpcm->timer);
 318         dpcm->timer.data = (unsigned long) dpcm;
 319         dpcm->timer.function = snd_card_dummy_pcm_timer_function;
 320         spin_lock_init(&dpcm->lock);
 321         dpcm->substream = substream;
 322         return dpcm;
 323 }
 324
 325 static int snd_card_dummy_playback_open(struct snd_pcm_substream *substream)
 326 {
 327         struct snd_pcm_runtime *runtime = substream->runtime;
 328         struct snd_dummy_pcm *dpcm;
 329         int err;
 330
 331         if ((dpcm = new_pcm_stream(substream)) == NULL)
 332                 return -ENOMEM;
 333         runtime->private_data = dpcm;
 334         runtime->private_free = snd_card_dummy_runtime_free;
 335         runtime->hw = snd_card_dummy_playback;
 336         if (substream->pcm->device & 1) {
 337                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 338                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 339         }
 340         if (substream->pcm->device & 2)
 341                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
 342         if ((err = add_playback_constraints(runtime)) < 0) {
 343                 kfree(dpcm);
 344                 return err;
 345         }
 346
 347         return 0;
 348 }
 349
 350 static int snd_card_dummy_capture_open(struct snd_pcm_substream *substream)
 351 {
 352         struct snd_pcm_runtime *runtime = substream->runtime;
 353         struct snd_dummy_pcm *dpcm;
 354         int err;
 355
 356         if ((dpcm = new_pcm_stream(substream)) == NULL)
 357                 return -ENOMEM;
 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         if ((err = add_capture_constraints(runtime)) < 0) {
 368                 kfree(dpcm);
 369                 return err;
 370         }
 371
 372         return 0;
 373 }
 374
 375 static int snd_card_dummy_playback_close(struct snd_pcm_substream *substream)
 376 {
 377         return 0;
 378 }
 379
 380 static int snd_card_dummy_capture_close(struct snd_pcm_substream *substream)
 381 {
 382         return 0;
 383 }
 384
 385 static struct snd_pcm_ops snd_card_dummy_playback_ops = {
 386         .open =                 snd_card_dummy_playback_open,
 387         .close =                snd_card_dummy_playback_close,
 388         .ioctl =                snd_pcm_lib_ioctl,
 389         .hw_params =            snd_card_dummy_hw_params,
 390         .hw_free =              snd_card_dummy_hw_free,
 391         .prepare =              snd_card_dummy_pcm_prepare,
 392         .trigger =              snd_card_dummy_pcm_trigger,
 393         .pointer =              snd_card_dummy_pcm_pointer,
 394 };
 395
 396 static struct snd_pcm_ops snd_card_dummy_capture_ops = {
 397         .open =                 snd_card_dummy_capture_open,
 398         .close =                snd_card_dummy_capture_close,
 399         .ioctl =                snd_pcm_lib_ioctl,
 400         .hw_params =            snd_card_dummy_hw_params,
 401         .hw_free =              snd_card_dummy_hw_free,
 402         .prepare =              snd_card_dummy_pcm_prepare,
 403         .trigger =              snd_card_dummy_pcm_trigger,
 404         .pointer =              snd_card_dummy_pcm_pointer,
 405 };
 406
 407 static int __init snd_card_dummy_pcm(struct snd_dummy *dummy, int device, int substreams)
 408 {
 409         struct snd_pcm *pcm;
 410         int err;
 411
 412         if ((err = snd_pcm_new(dummy->card, "Dummy PCM", device,
 413                                substreams, substreams, &pcm)) < 0)
 414                 return err;
 415         dummy->pcm = pcm;
 416         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_card_dummy_playback_ops);
 417         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_dummy_capture_ops);
 418         pcm->private_data = dummy;
 419         pcm->info_flags = 0;
 420         strcpy(pcm->name, "Dummy PCM");
 421         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
 422                                               snd_dma_continuous_data(GFP_KERNEL),
 423                                               0, 64*1024);
 424         return 0;
 425 }
 426
 427 #define DUMMY_VOLUME(xname, xindex, addr) \
 428 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 429   .info = snd_dummy_volume_info, \
 430   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
 431   .private_value = addr }
 432
 433 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
 434                                  struct snd_ctl_elem_info *uinfo)
 435 {
 436         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 437         uinfo->count = 2;
 438         uinfo->value.integer.min = -50;
 439         uinfo->value.integer.max = 100;
 440         return 0;
 441 }
 442
 443 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
 444                                 struct snd_ctl_elem_value *ucontrol)
 445 {
 446         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 447         int addr = kcontrol->private_value;
 448
 449         spin_lock_irq(&dummy->mixer_lock);
 450         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
 451         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
 452         spin_unlock_irq(&dummy->mixer_lock);
 453         return 0;
 454 }
 455
 456 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
 457                                 struct snd_ctl_elem_value *ucontrol)
 458 {
 459         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 460         int change, addr = kcontrol->private_value;
 461         int left, right;
 462
 463         left = ucontrol->value.integer.value[0];
 464         if (left < -50)
 465                 left = -50;
 466         if (left > 100)
 467                 left = 100;
 468         right = ucontrol->value.integer.value[1];
 469         if (right < -50)
 470                 right = -50;
 471         if (right > 100)
 472                 right = 100;
 473         spin_lock_irq(&dummy->mixer_lock);
 474         change = dummy->mixer_volume[addr][0] != left ||
 475                  dummy->mixer_volume[addr][1] != right;
 476         dummy->mixer_volume[addr][0] = left;
 477         dummy->mixer_volume[addr][1] = right;
 478         spin_unlock_irq(&dummy->mixer_lock);
 479         return change;
 480 }
 481
 482 #define DUMMY_CAPSRC(xname, xindex, addr) \
 483 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 484   .info = snd_dummy_capsrc_info, \
 485   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
 486   .private_value = addr }
 487
 488 static int snd_dummy_capsrc_info(struct snd_kcontrol *kcontrol,
 489                                  struct snd_ctl_elem_info *uinfo)
 490 {
 491         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
 492         uinfo->count = 2;
 493         uinfo->value.integer.min = 0;
 494         uinfo->value.integer.max = 1;
 495         return 0;
 496 }
 497
 498 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
 499                                 struct snd_ctl_elem_value *ucontrol)
 500 {
 501         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 502         int addr = kcontrol->private_value;
 503
 504         spin_lock_irq(&dummy->mixer_lock);
 505         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
 506         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
 507         spin_unlock_irq(&dummy->mixer_lock);
 508         return 0;
 509 }
 510
 511 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 512 {
 513         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 514         int change, addr = kcontrol->private_value;
 515         int left, right;
 516
 517         left = ucontrol->value.integer.value[0] & 1;
 518         right = ucontrol->value.integer.value[1] & 1;
 519         spin_lock_irq(&dummy->mixer_lock);
 520         change = dummy->capture_source[addr][0] != left &&
 521                  dummy->capture_source[addr][1] != right;
 522         dummy->capture_source[addr][0] = left;
 523         dummy->capture_source[addr][1] = right;
 524         spin_unlock_irq(&dummy->mixer_lock);
 525         return change;
 526 }
 527
 528 static struct snd_kcontrol_new snd_dummy_controls[] = {
 529 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
 530 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
 531 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
 532 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_MASTER),
 533 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
 534 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_MASTER),
 535 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
 536 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MASTER),
 537 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
 538 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_MASTER)
 539 };
 540
 541 static int __init snd_card_dummy_new_mixer(struct snd_dummy *dummy)
 542 {
 543         struct snd_card *card = dummy->card;
 544         unsigned int idx;
 545         int err;
 546
 547         snd_assert(dummy != NULL, return -EINVAL);
 548         spin_lock_init(&dummy->mixer_lock);
 549         strcpy(card->mixername, "Dummy Mixer");
 550
 551         for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
 552                 if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy))) < 0)
 553                         return err;
 554         }
 555         return 0;
 556 }
 557
 558 static int __init snd_dummy_probe(struct platform_device *devptr)
 559 {
 560         struct snd_card *card;
 561         struct snd_dummy *dummy;
 562         int idx, err;
 563         int dev = devptr->id;
 564
 565         card = snd_card_new(index[dev], id[dev], THIS_MODULE,
 566                             sizeof(struct snd_dummy));
 567         if (card == NULL)
 568                 return -ENOMEM;
 569         dummy = card->private_data;
 570         dummy->card = card;
 571         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
 572                 if (pcm_substreams[dev] < 1)
 573                         pcm_substreams[dev] = 1;
 574                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
 575                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
 576                 if ((err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev])) < 0)
 577                         goto __nodev;
 578         }
 579         if ((err = snd_card_dummy_new_mixer(dummy)) < 0)
 580                 goto __nodev;
 581         strcpy(card->driver, "Dummy");
 582         strcpy(card->shortname, "Dummy");
 583         sprintf(card->longname, "Dummy %i", dev + 1);
 584
 585         snd_card_set_dev(card, &devptr->dev);
 586
 587         if ((err = snd_card_register(card)) == 0) {
 588                 platform_set_drvdata(devptr, card);
 589                 return 0;
 590         }
 591       __nodev:
 592         snd_card_free(card);
 593         return err;
 594 }
 595
 596 static int snd_dummy_remove(struct platform_device *devptr)
 597 {
 598         snd_card_free(platform_get_drvdata(devptr));
 599         platform_set_drvdata(devptr, NULL);
 600         return 0;
 601 }
 602
 603 #ifdef CONFIG_PM
 604 static int snd_dummy_suspend(struct platform_device *pdev, pm_message_t state)
 605 {
 606         struct snd_card *card = platform_get_drvdata(pdev);
 607         struct snd_dummy *dummy = card->private_data;
 608
 609         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
 610         snd_pcm_suspend_all(dummy->pcm);
 611         return 0;
 612 }
 613
 614 static int snd_dummy_resume(struct platform_device *pdev)
 615 {
 616         struct snd_card *card = platform_get_drvdata(pdev);
 617
 618         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
 619         return 0;
 620 }
 621 #endif
 622
 623 #define SND_DUMMY_DRIVER        "snd_dummy"
 624
 625 static struct platform_driver snd_dummy_driver = {
 626         .probe          = snd_dummy_probe,
 627         .remove         = snd_dummy_remove,
 628 #ifdef CONFIG_PM
 629         .suspend        = snd_dummy_suspend,
 630         .resume         = snd_dummy_resume,
 631 #endif
 632         .driver         = {
 633                 .name   = SND_DUMMY_DRIVER
 634         },
 635 };
 636
 637 static int __init alsa_card_dummy_init(void)
 638 {
 639         int i, cards, err;
 640
 641         if ((err = platform_driver_register(&snd_dummy_driver)) < 0)
 642                 return err;
 643
 644         cards = 0;
 645         for (i = 0; i < SNDRV_CARDS && enable[i]; i++) {
 646                 struct platform_device *device;
 647                 device = platform_device_register_simple(SND_DUMMY_DRIVER,
 648                                                          i, NULL, 0);
 649                 if (IS_ERR(device)) {
 650                         err = PTR_ERR(device);
 651                         goto errout;
 652                 }
 653                 cards++;
 654         }
 655         if (!cards) {
 656 #ifdef MODULE
 657                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
 658 #endif
 659                 err = -ENODEV;
 660                 goto errout;
 661         }
 662         return 0;
 663
 664  errout:
 665         platform_driver_unregister(&snd_dummy_driver);
 666         return err;
 667 }
 668
 669 static void __exit alsa_card_dummy_exit(void)
 670 {
 671         platform_driver_unregister(&snd_dummy_driver);
 672 }
 673
 674 module_init(alsa_card_dummy_init)
 675 module_exit(alsa_card_dummy_exit)