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 static struct platform_device *devices[SNDRV_CARDS];
 148
 149 #define MIXER_ADDR_MASTER       0
 150 #define MIXER_ADDR_LINE         1
 151 #define MIXER_ADDR_MIC          2
 152 #define MIXER_ADDR_SYNTH        3
 153 #define MIXER_ADDR_CD           4
 154 #define MIXER_ADDR_LAST         4
 155
 156 struct snd_dummy {
 157         struct snd_card *card;
 158         struct snd_pcm *pcm;
 159         spinlock_t mixer_lock;
 160         int mixer_volume[MIXER_ADDR_LAST+1][2];
 161         int capture_source[MIXER_ADDR_LAST+1][2];
 162 };
 163
 164 struct snd_dummy_pcm {
 165         struct snd_dummy *dummy;
 166         spinlock_t lock;
 167         struct timer_list timer;
 168         unsigned int pcm_size;
 169         unsigned int pcm_count;
 170         unsigned int pcm_bps;           /* bytes per second */
 171         unsigned int pcm_jiffie;        /* bytes per one jiffie */
 172         unsigned int pcm_irq_pos;       /* IRQ position */
 173         unsigned int pcm_buf_pos;       /* position in buffer */
 174         struct snd_pcm_substream *substream;
 175 };
 176
 177
 178 static inline void snd_card_dummy_pcm_timer_start(struct snd_dummy_pcm *dpcm)
 179 {
 180         dpcm->timer.expires = 1 + jiffies;
 181         add_timer(&dpcm->timer);
 182 }
 183
 184 static inline void snd_card_dummy_pcm_timer_stop(struct snd_dummy_pcm *dpcm)
 185 {
 186         del_timer(&dpcm->timer);
 187 }
 188
 189 static int snd_card_dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 190 {
 191         struct snd_pcm_runtime *runtime = substream->runtime;
 192         struct snd_dummy_pcm *dpcm = runtime->private_data;
 193         int err = 0;
 194
 195         spin_lock(&dpcm->lock);
 196         switch (cmd) {
 197         case SNDRV_PCM_TRIGGER_START:
 198         case SNDRV_PCM_TRIGGER_RESUME:
 199                 snd_card_dummy_pcm_timer_start(dpcm);
 200                 break;
 201         case SNDRV_PCM_TRIGGER_STOP:
 202         case SNDRV_PCM_TRIGGER_SUSPEND:
 203                 snd_card_dummy_pcm_timer_stop(dpcm);
 204                 break;
 205         default:
 206                 err = -EINVAL;
 207                 break;
 208         }
 209         spin_unlock(&dpcm->lock);
 210         return 0;
 211 }
 212
 213 static int snd_card_dummy_pcm_prepare(struct snd_pcm_substream *substream)
 214 {
 215         struct snd_pcm_runtime *runtime = substream->runtime;
 216         struct snd_dummy_pcm *dpcm = runtime->private_data;
 217         unsigned int bps;
 218
 219         bps = runtime->rate * runtime->channels;
 220         bps *= snd_pcm_format_width(runtime->format);
 221         bps /= 8;
 222         if (bps <= 0)
 223                 return -EINVAL;
 224         dpcm->pcm_bps = bps;
 225         dpcm->pcm_jiffie = bps / HZ;
 226         dpcm->pcm_size = snd_pcm_lib_buffer_bytes(substream);
 227         dpcm->pcm_count = snd_pcm_lib_period_bytes(substream);
 228         dpcm->pcm_irq_pos = 0;
 229         dpcm->pcm_buf_pos = 0;
 230         return 0;
 231 }
 232
 233 static void snd_card_dummy_pcm_timer_function(unsigned long data)
 234 {
 235         struct snd_dummy_pcm *dpcm = (struct snd_dummy_pcm *)data;
 236         unsigned long flags;
 237
 238         spin_lock_irqsave(&dpcm->lock, flags);
 239         dpcm->timer.expires = 1 + jiffies;
 240         add_timer(&dpcm->timer);
 241         dpcm->pcm_irq_pos += dpcm->pcm_jiffie;
 242         dpcm->pcm_buf_pos += dpcm->pcm_jiffie;
 243         dpcm->pcm_buf_pos %= dpcm->pcm_size;
 244         if (dpcm->pcm_irq_pos >= dpcm->pcm_count) {
 245                 dpcm->pcm_irq_pos %= dpcm->pcm_count;
 246                 spin_unlock_irqrestore(&dpcm->lock, flags);
 247                 snd_pcm_period_elapsed(dpcm->substream);
 248         } else
 249                 spin_unlock_irqrestore(&dpcm->lock, flags);
 250 }
 251
 252 static snd_pcm_uframes_t snd_card_dummy_pcm_pointer(struct snd_pcm_substream *substream)
 253 {
 254         struct snd_pcm_runtime *runtime = substream->runtime;
 255         struct snd_dummy_pcm *dpcm = runtime->private_data;
 256
 257         return bytes_to_frames(runtime, dpcm->pcm_buf_pos);
 258 }
 259
 260 static struct snd_pcm_hardware snd_card_dummy_playback =
 261 {
 262         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 263                                  SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
 264         .formats =              USE_FORMATS,
 265         .rates =                USE_RATE,
 266         .rate_min =             USE_RATE_MIN,
 267         .rate_max =             USE_RATE_MAX,
 268         .channels_min =         USE_CHANNELS_MIN,
 269         .channels_max =         USE_CHANNELS_MAX,
 270         .buffer_bytes_max =     MAX_BUFFER_SIZE,
 271         .period_bytes_min =     64,
 272         .period_bytes_max =     MAX_BUFFER_SIZE,
 273         .periods_min =          USE_PERIODS_MIN,
 274         .periods_max =          USE_PERIODS_MAX,
 275         .fifo_size =            0,
 276 };
 277
 278 static struct snd_pcm_hardware snd_card_dummy_capture =
 279 {
 280         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 281                                  SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
 282         .formats =              USE_FORMATS,
 283         .rates =                USE_RATE,
 284         .rate_min =             USE_RATE_MIN,
 285         .rate_max =             USE_RATE_MAX,
 286         .channels_min =         USE_CHANNELS_MIN,
 287         .channels_max =         USE_CHANNELS_MAX,
 288         .buffer_bytes_max =     MAX_BUFFER_SIZE,
 289         .period_bytes_min =     64,
 290         .period_bytes_max =     MAX_BUFFER_SIZE,
 291         .periods_min =          USE_PERIODS_MIN,
 292         .periods_max =          USE_PERIODS_MAX,
 293         .fifo_size =            0,
 294 };
 295
 296 static void snd_card_dummy_runtime_free(struct snd_pcm_runtime *runtime)
 297 {
 298         kfree(runtime->private_data);
 299 }
 300
 301 static int snd_card_dummy_hw_params(struct snd_pcm_substream *substream,
 302                                     struct snd_pcm_hw_params *hw_params)
 303 {
 304         return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
 305 }
 306
 307 static int snd_card_dummy_hw_free(struct snd_pcm_substream *substream)
 308 {
 309         return snd_pcm_lib_free_pages(substream);
 310 }
 311
 312 static struct snd_dummy_pcm *new_pcm_stream(struct snd_pcm_substream *substream)
 313 {
 314         struct snd_dummy_pcm *dpcm;
 315
 316         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
 317         if (! dpcm)
 318                 return dpcm;
 319         init_timer(&dpcm->timer);
 320         dpcm->timer.data = (unsigned long) dpcm;
 321         dpcm->timer.function = snd_card_dummy_pcm_timer_function;
 322         spin_lock_init(&dpcm->lock);
 323         dpcm->substream = substream;
 324         return dpcm;
 325 }
 326
 327 static int snd_card_dummy_playback_open(struct snd_pcm_substream *substream)
 328 {
 329         struct snd_pcm_runtime *runtime = substream->runtime;
 330         struct snd_dummy_pcm *dpcm;
 331         int err;
 332
 333         if ((dpcm = new_pcm_stream(substream)) == NULL)
 334                 return -ENOMEM;
 335         runtime->private_data = dpcm;
 336         runtime->private_free = snd_card_dummy_runtime_free;
 337         runtime->hw = snd_card_dummy_playback;
 338         if (substream->pcm->device & 1) {
 339                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 340                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 341         }
 342         if (substream->pcm->device & 2)
 343                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
 344         if ((err = add_playback_constraints(runtime)) < 0) {
 345                 kfree(dpcm);
 346                 return err;
 347         }
 348
 349         return 0;
 350 }
 351
 352 static int snd_card_dummy_capture_open(struct snd_pcm_substream *substream)
 353 {
 354         struct snd_pcm_runtime *runtime = substream->runtime;
 355         struct snd_dummy_pcm *dpcm;
 356         int err;
 357
 358         if ((dpcm = new_pcm_stream(substream)) == NULL)
 359                 return -ENOMEM;
 360         runtime->private_data = dpcm;
 361         runtime->private_free = snd_card_dummy_runtime_free;
 362         runtime->hw = snd_card_dummy_capture;
 363         if (substream->pcm->device == 1) {
 364                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 365                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 366         }
 367         if (substream->pcm->device & 2)
 368                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
 369         if ((err = add_capture_constraints(runtime)) < 0) {
 370                 kfree(dpcm);
 371                 return err;
 372         }
 373
 374         return 0;
 375 }
 376
 377 static int snd_card_dummy_playback_close(struct snd_pcm_substream *substream)
 378 {
 379         return 0;
 380 }
 381
 382 static int snd_card_dummy_capture_close(struct snd_pcm_substream *substream)
 383 {
 384         return 0;
 385 }
 386
 387 static struct snd_pcm_ops snd_card_dummy_playback_ops = {
 388         .open =                 snd_card_dummy_playback_open,
 389         .close =                snd_card_dummy_playback_close,
 390         .ioctl =                snd_pcm_lib_ioctl,
 391         .hw_params =            snd_card_dummy_hw_params,
 392         .hw_free =              snd_card_dummy_hw_free,
 393         .prepare =              snd_card_dummy_pcm_prepare,
 394         .trigger =              snd_card_dummy_pcm_trigger,
 395         .pointer =              snd_card_dummy_pcm_pointer,
 396 };
 397
 398 static struct snd_pcm_ops snd_card_dummy_capture_ops = {
 399         .open =                 snd_card_dummy_capture_open,
 400         .close =                snd_card_dummy_capture_close,
 401         .ioctl =                snd_pcm_lib_ioctl,
 402         .hw_params =            snd_card_dummy_hw_params,
 403         .hw_free =              snd_card_dummy_hw_free,
 404         .prepare =              snd_card_dummy_pcm_prepare,
 405         .trigger =              snd_card_dummy_pcm_trigger,
 406         .pointer =              snd_card_dummy_pcm_pointer,
 407 };
 408
 409 static int __init snd_card_dummy_pcm(struct snd_dummy *dummy, int device, int substreams)
 410 {
 411         struct snd_pcm *pcm;
 412         int err;
 413
 414         if ((err = snd_pcm_new(dummy->card, "Dummy PCM", device,
 415                                substreams, substreams, &pcm)) < 0)
 416                 return err;
 417         dummy->pcm = pcm;
 418         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_card_dummy_playback_ops);
 419         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_dummy_capture_ops);
 420         pcm->private_data = dummy;
 421         pcm->info_flags = 0;
 422         strcpy(pcm->name, "Dummy PCM");
 423         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
 424                                               snd_dma_continuous_data(GFP_KERNEL),
 425                                               0, 64*1024);
 426         return 0;
 427 }
 428
 429 #define DUMMY_VOLUME(xname, xindex, addr) \
 430 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 431   .info = snd_dummy_volume_info, \
 432   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
 433   .private_value = addr }
 434
 435 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
 436                                  struct snd_ctl_elem_info *uinfo)
 437 {
 438         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 439         uinfo->count = 2;
 440         uinfo->value.integer.min = -50;
 441         uinfo->value.integer.max = 100;
 442         return 0;
 443 }
 444
 445 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
 446                                 struct snd_ctl_elem_value *ucontrol)
 447 {
 448         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 449         int addr = kcontrol->private_value;
 450
 451         spin_lock_irq(&dummy->mixer_lock);
 452         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
 453         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
 454         spin_unlock_irq(&dummy->mixer_lock);
 455         return 0;
 456 }
 457
 458 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
 459                                 struct snd_ctl_elem_value *ucontrol)
 460 {
 461         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 462         int change, addr = kcontrol->private_value;
 463         int left, right;
 464
 465         left = ucontrol->value.integer.value[0];
 466         if (left < -50)
 467                 left = -50;
 468         if (left > 100)
 469                 left = 100;
 470         right = ucontrol->value.integer.value[1];
 471         if (right < -50)
 472                 right = -50;
 473         if (right > 100)
 474                 right = 100;
 475         spin_lock_irq(&dummy->mixer_lock);
 476         change = dummy->mixer_volume[addr][0] != left ||
 477                  dummy->mixer_volume[addr][1] != right;
 478         dummy->mixer_volume[addr][0] = left;
 479         dummy->mixer_volume[addr][1] = right;
 480         spin_unlock_irq(&dummy->mixer_lock);
 481         return change;
 482 }
 483
 484 #define DUMMY_CAPSRC(xname, xindex, addr) \
 485 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 486   .info = snd_dummy_capsrc_info, \
 487   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
 488   .private_value = addr }
 489
 490 static int snd_dummy_capsrc_info(struct snd_kcontrol *kcontrol,
 491                                  struct snd_ctl_elem_info *uinfo)
 492 {
 493         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
 494         uinfo->count = 2;
 495         uinfo->value.integer.min = 0;
 496         uinfo->value.integer.max = 1;
 497         return 0;
 498 }
 499
 500 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
 501                                 struct snd_ctl_elem_value *ucontrol)
 502 {
 503         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 504         int addr = kcontrol->private_value;
 505
 506         spin_lock_irq(&dummy->mixer_lock);
 507         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
 508         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
 509         spin_unlock_irq(&dummy->mixer_lock);
 510         return 0;
 511 }
 512
 513 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 514 {
 515         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
 516         int change, addr = kcontrol->private_value;
 517         int left, right;
 518
 519         left = ucontrol->value.integer.value[0] & 1;
 520         right = ucontrol->value.integer.value[1] & 1;
 521         spin_lock_irq(&dummy->mixer_lock);
 522         change = dummy->capture_source[addr][0] != left &&
 523                  dummy->capture_source[addr][1] != right;
 524         dummy->capture_source[addr][0] = left;
 525         dummy->capture_source[addr][1] = right;
 526         spin_unlock_irq(&dummy->mixer_lock);
 527         return change;
 528 }
 529
 530 static struct snd_kcontrol_new snd_dummy_controls[] = {
 531 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
 532 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
 533 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
 534 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_MASTER),
 535 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
 536 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_MASTER),
 537 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
 538 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MASTER),
 539 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
 540 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_MASTER)
 541 };
 542
 543 static int __init snd_card_dummy_new_mixer(struct snd_dummy *dummy)
 544 {
 545         struct snd_card *card = dummy->card;
 546         unsigned int idx;
 547         int err;
 548
 549         snd_assert(dummy != NULL, return -EINVAL);
 550         spin_lock_init(&dummy->mixer_lock);
 551         strcpy(card->mixername, "Dummy Mixer");
 552
 553         for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
 554                 if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy))) < 0)
 555                         return err;
 556         }
 557         return 0;
 558 }
 559
 560 static int __init snd_dummy_probe(struct platform_device *devptr)
 561 {
 562         struct snd_card *card;
 563         struct snd_dummy *dummy;
 564         int idx, err;
 565         int dev = devptr->id;
 566
 567         card = snd_card_new(index[dev], id[dev], THIS_MODULE,
 568                             sizeof(struct snd_dummy));
 569         if (card == NULL)
 570                 return -ENOMEM;
 571         dummy = card->private_data;
 572         dummy->card = card;
 573         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
 574                 if (pcm_substreams[dev] < 1)
 575                         pcm_substreams[dev] = 1;
 576                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
 577                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
 578                 if ((err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev])) < 0)
 579                         goto __nodev;
 580         }
 581         if ((err = snd_card_dummy_new_mixer(dummy)) < 0)
 582                 goto __nodev;
 583         strcpy(card->driver, "Dummy");
 584         strcpy(card->shortname, "Dummy");
 585         sprintf(card->longname, "Dummy %i", dev + 1);
 586
 587         snd_card_set_dev(card, &devptr->dev);
 588
 589         if ((err = snd_card_register(card)) == 0) {
 590                 platform_set_drvdata(devptr, card);
 591                 return 0;
 592         }
 593       __nodev:
 594         snd_card_free(card);
 595         return err;
 596 }
 597
 598 static int snd_dummy_remove(struct platform_device *devptr)
 599 {
 600         snd_card_free(platform_get_drvdata(devptr));
 601         platform_set_drvdata(devptr, NULL);
 602         return 0;
 603 }
 604
 605 #ifdef CONFIG_PM
 606 static int snd_dummy_suspend(struct platform_device *pdev, pm_message_t state)
 607 {
 608         struct snd_card *card = platform_get_drvdata(pdev);
 609         struct snd_dummy *dummy = card->private_data;
 610
 611         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
 612         snd_pcm_suspend_all(dummy->pcm);
 613         return 0;
 614 }
 615
 616 static int snd_dummy_resume(struct platform_device *pdev)
 617 {
 618         struct snd_card *card = platform_get_drvdata(pdev);
 619
 620         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
 621         return 0;
 622 }
 623 #endif
 624
 625 #define SND_DUMMY_DRIVER        "snd_dummy"
 626
 627 static struct platform_driver snd_dummy_driver = {
 628         .probe          = snd_dummy_probe,
 629         .remove         = snd_dummy_remove,
 630 #ifdef CONFIG_PM
 631         .suspend        = snd_dummy_suspend,
 632         .resume         = snd_dummy_resume,
 633 #endif
 634         .driver         = {
 635                 .name   = SND_DUMMY_DRIVER
 636         },
 637 };
 638
 639 static void __init_or_module snd_dummy_unregister_all(void)
 640 {
 641         int i;
 642
 643         for (i = 0; i < ARRAY_SIZE(devices); ++i)
 644                 platform_device_unregister(devices[i]);
 645         platform_driver_unregister(&snd_dummy_driver);
 646 }
 647
 648 static int __init alsa_card_dummy_init(void)
 649 {
 650         int i, cards, err;
 651
 652         if ((err = platform_driver_register(&snd_dummy_driver)) < 0)
 653                 return err;
 654
 655         cards = 0;
 656         for (i = 0; i < SNDRV_CARDS && enable[i]; i++) {
 657                 struct platform_device *device;
 658                 device = platform_device_register_simple(SND_DUMMY_DRIVER,
 659                                                          i, NULL, 0);
 660                 if (IS_ERR(device)) {
 661                         err = PTR_ERR(device);
 662                         goto errout;
 663                 }
 664                 devices[i] = device;
 665                 cards++;
 666         }
 667         if (!cards) {
 668 #ifdef MODULE
 669                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
 670 #endif
 671                 err = -ENODEV;
 672                 goto errout;
 673         }
 674         return 0;
 675
 676  errout:
 677         snd_dummy_unregister_all();
 678         return err;
 679 }
 680
 681 static void __exit alsa_card_dummy_exit(void)
 682 {
 683         snd_dummy_unregister_all();
 684 }
 685
 686 module_init(alsa_card_dummy_init)
 687 module_exit(alsa_card_dummy_exit)