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_CLASSES("{sound}");
  38 MODULE_DEVICES("{{ALSA,Dummy soundcard}}");
  39
  40 #define MAX_PCM_DEVICES         4
  41 #define MAX_PCM_SUBSTREAMS      16
  42 #define MAX_MIDI_DEVICES        2
  43
  44 #if 0 /* emu10k1 emulation */
  45 #define MAX_BUFFER_SIZE         (128 * 1024)
  46 static int emu10k1_playback_constraints(snd_pcm_runtime_t *runtime)
  47 {
  48         int err;
  49         if ((err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
  50                 return err;
  51         if ((err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX)) < 0)
  52                 return err;
  53         return 0;
  54 }
  55 #define add_playback_constraints emu10k1_playback_constraints
  56 #endif
  57
  58 #if 0 /* RME9652 emulation */
  59 #define MAX_BUFFER_SIZE         (26 * 64 * 1024)
  60 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
  61 #define USE_CHANNELS_MIN        26
  62 #define USE_CHANNELS_MAX        26
  63 #define USE_PERIODS_MIN         2
  64 #define USE_PERIODS_MAX         2
  65 #endif
  66
  67 #if 0 /* ICE1712 emulation */
  68 #define MAX_BUFFER_SIZE         (256 * 1024)
  69 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
  70 #define USE_CHANNELS_MIN        10
  71 #define USE_CHANNELS_MAX        10
  72 #define USE_PERIODS_MIN         1
  73 #define USE_PERIODS_MAX         1024
  74 #endif
  75
  76 #if 0 /* UDA1341 emulation */
  77 #define MAX_BUFFER_SIZE         (16380)
  78 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
  79 #define USE_CHANNELS_MIN        2
  80 #define USE_CHANNELS_MAX        2
  81 #define USE_PERIODS_MIN         2
  82 #define USE_PERIODS_MAX         255
  83 #endif
  84
  85 #if 0 /* simple AC97 bridge (intel8x0) with 48kHz AC97 only codec */
  86 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
  87 #define USE_CHANNELS_MIN        2
  88 #define USE_CHANNELS_MAX        2
  89 #define USE_RATE                SNDRV_PCM_RATE_48000
  90 #define USE_RATE_MIN            48000
  91 #define USE_RATE_MAX            48000
  92 #endif
  93
  94
  95 /* defaults */
  96 #ifndef MAX_BUFFER_SIZE
  97 #define MAX_BUFFER_SIZE         (64*1024)
  98 #endif
  99 #ifndef USE_FORMATS
 100 #define USE_FORMATS             (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)
 101 #endif
 102 #ifndef USE_RATE
 103 #define USE_RATE                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000
 104 #define USE_RATE_MIN            5500
 105 #define USE_RATE_MAX            48000
 106 #endif
 107 #ifndef USE_CHANNELS_MIN
 108 #define USE_CHANNELS_MIN        1
 109 #endif
 110 #ifndef USE_CHANNELS_MAX
 111 #define USE_CHANNELS_MAX        2
 112 #endif
 113 #ifndef USE_PERIODS_MIN
 114 #define USE_PERIODS_MIN         1
 115 #endif
 116 #ifndef USE_PERIODS_MAX
 117 #define USE_PERIODS_MAX         1024
 118 #endif
 119 #ifndef add_playback_constraints
 120 #define add_playback_constraints(x) 0
 121 #endif
 122 #ifndef add_capture_constraints
 123 #define add_capture_constraints(x) 0
 124 #endif
 125
 126 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
 127 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
 128 static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
 129 static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
 130 static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
 131 //static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
 132 static int boot_devs;
 133
 134 module_param_array(index, int, boot_devs, 0444);
 135 MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
 136 MODULE_PARM_SYNTAX(index, SNDRV_INDEX_DESC);
 137 module_param_array(id, charp, boot_devs, 0444);
 138 MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
 139 MODULE_PARM_SYNTAX(id, SNDRV_ID_DESC);
 140 module_param_array(enable, bool, boot_devs, 0444);
 141 MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
 142 MODULE_PARM_SYNTAX(enable, SNDRV_ENABLE_DESC);
 143 module_param_array(pcm_devs, int, boot_devs, 0444);
 144 MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
 145 MODULE_PARM_SYNTAX(pcm_devs, SNDRV_ENABLED ",allows:{{0,4}},default:1,dialog:list");
 146 module_param_array(pcm_substreams, int, boot_devs, 0444);
 147 MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-16) for dummy driver.");
 148 MODULE_PARM_SYNTAX(pcm_substreams, SNDRV_ENABLED ",allows:{{1,16}},default:8,dialog:list");
 149 //module_param_array(midi_devs, int, boot_devs, 0444);
 150 //MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
 151 //MODULE_PARM_SYNTAX(midi_devs, SNDRV_ENABLED ",allows:{{0,2}},default:8,dialog:list");
 152
 153 #define MIXER_ADDR_MASTER       0
 154 #define MIXER_ADDR_LINE         1
 155 #define MIXER_ADDR_MIC          2
 156 #define MIXER_ADDR_SYNTH        3
 157 #define MIXER_ADDR_CD           4
 158 #define MIXER_ADDR_LAST         4
 159
 160 typedef struct snd_card_dummy {
 161         snd_card_t *card;
 162         spinlock_t mixer_lock;
 163         int mixer_volume[MIXER_ADDR_LAST+1][2];
 164         int capture_source[MIXER_ADDR_LAST+1][2];
 165 } snd_card_dummy_t;
 166
 167 typedef struct snd_card_dummy_pcm {
 168         snd_card_dummy_t *dummy;
 169         spinlock_t lock;
 170         struct timer_list timer;
 171         unsigned int pcm_size;
 172         unsigned int pcm_count;
 173         unsigned int pcm_bps;           /* bytes per second */
 174         unsigned int pcm_jiffie;        /* bytes per one jiffie */
 175         unsigned int pcm_irq_pos;       /* IRQ position */
 176         unsigned int pcm_buf_pos;       /* position in buffer */
 177         snd_pcm_substream_t *substream;
 178 } snd_card_dummy_pcm_t;
 179
 180 static snd_card_t *snd_dummy_cards[SNDRV_CARDS] = SNDRV_DEFAULT_PTR;
 181
 182
 183 static int snd_card_dummy_playback_ioctl(snd_pcm_substream_t * substream,
 184                                          unsigned int cmd,
 185                                          void *arg)
 186 {
 187         return snd_pcm_lib_ioctl(substream, cmd, arg);
 188 }
 189
 190 static int snd_card_dummy_capture_ioctl(snd_pcm_substream_t * substream,
 191                                         unsigned int cmd,
 192                                         void *arg)
 193 {
 194         return snd_pcm_lib_ioctl(substream, cmd, arg);
 195 }
 196
 197 static void snd_card_dummy_pcm_timer_start(snd_pcm_substream_t * substream)
 198 {
 199         snd_pcm_runtime_t *runtime = substream->runtime;
 200         snd_card_dummy_pcm_t *dpcm = snd_magic_cast(snd_card_dummy_pcm_t, runtime->private_data, return);
 201
 202         dpcm->timer.expires = 1 + jiffies;
 203         add_timer(&dpcm->timer);
 204 }
 205
 206 static void snd_card_dummy_pcm_timer_stop(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);
 210
 211         del_timer(&dpcm->timer);
 212 }
 213
 214 static int snd_card_dummy_playback_trigger(snd_pcm_substream_t * substream,
 215                                            int cmd)
 216 {
 217         if (cmd == SNDRV_PCM_TRIGGER_START) {
 218                 snd_card_dummy_pcm_timer_start(substream);
 219         } else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
 220                 snd_card_dummy_pcm_timer_stop(substream);
 221         } else {
 222                 return -EINVAL;
 223         }
 224         return 0;
 225 }
 226
 227 static int snd_card_dummy_capture_trigger(snd_pcm_substream_t * substream,
 228                                           int cmd)
 229 {
 230         if (cmd == SNDRV_PCM_TRIGGER_START) {
 231                 snd_card_dummy_pcm_timer_start(substream);
 232         } else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
 233                 snd_card_dummy_pcm_timer_stop(substream);
 234         } else {
 235                 return -EINVAL;
 236         }
 237         return 0;
 238 }
 239
 240 static int snd_card_dummy_pcm_prepare(snd_pcm_substream_t * substream)
 241 {
 242         snd_pcm_runtime_t *runtime = substream->runtime;
 243         snd_card_dummy_pcm_t *dpcm = snd_magic_cast(snd_card_dummy_pcm_t, runtime->private_data, return -ENXIO);
 244         unsigned int bps;
 245
 246         bps = runtime->rate * runtime->channels;
 247         bps *= snd_pcm_format_width(runtime->format);
 248         bps /= 8;
 249         if (bps <= 0)
 250                 return -EINVAL;
 251         dpcm->pcm_bps = bps;
 252         dpcm->pcm_jiffie = bps / HZ;
 253         dpcm->pcm_size = snd_pcm_lib_buffer_bytes(substream);
 254         dpcm->pcm_count = snd_pcm_lib_period_bytes(substream);
 255         dpcm->pcm_irq_pos = 0;
 256         dpcm->pcm_buf_pos = 0;
 257         return 0;
 258 }
 259
 260 static int snd_card_dummy_playback_prepare(snd_pcm_substream_t * substream)
 261 {
 262         return snd_card_dummy_pcm_prepare(substream);
 263 }
 264
 265 static int snd_card_dummy_capture_prepare(snd_pcm_substream_t * substream)
 266 {
 267         return snd_card_dummy_pcm_prepare(substream);
 268 }
 269
 270 static void snd_card_dummy_pcm_timer_function(unsigned long data)
 271 {
 272         snd_card_dummy_pcm_t *dpcm = snd_magic_cast(snd_card_dummy_pcm_t, (void *)data, return);
 273
 274         dpcm->timer.expires = 1 + jiffies;
 275         add_timer(&dpcm->timer);
 276         spin_lock_irq(&dpcm->lock);
 277         dpcm->pcm_irq_pos += dpcm->pcm_jiffie;
 278         dpcm->pcm_buf_pos += dpcm->pcm_jiffie;
 279         dpcm->pcm_buf_pos %= dpcm->pcm_size;
 280         if (dpcm->pcm_irq_pos >= dpcm->pcm_count) {
 281                 dpcm->pcm_irq_pos %= dpcm->pcm_count;
 282                 snd_pcm_period_elapsed(dpcm->substream);
 283         }
 284         spin_unlock_irq(&dpcm->lock);
 285 }
 286
 287 static snd_pcm_uframes_t snd_card_dummy_playback_pointer(snd_pcm_substream_t * substream)
 288 {
 289         snd_pcm_runtime_t *runtime = substream->runtime;
 290         snd_card_dummy_pcm_t *dpcm = snd_magic_cast(snd_card_dummy_pcm_t, runtime->private_data, return -ENXIO);
 291
 292         return bytes_to_frames(runtime, dpcm->pcm_buf_pos);
 293 }
 294
 295 static snd_pcm_uframes_t snd_card_dummy_capture_pointer(snd_pcm_substream_t * substream)
 296 {
 297         snd_pcm_runtime_t *runtime = substream->runtime;
 298         snd_card_dummy_pcm_t *dpcm = snd_magic_cast(snd_card_dummy_pcm_t, runtime->private_data, return -ENXIO);
 299
 300         return bytes_to_frames(runtime, dpcm->pcm_buf_pos);
 301 }
 302
 303 static snd_pcm_hardware_t snd_card_dummy_playback =
 304 {
 305         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 306                                  SNDRV_PCM_INFO_MMAP_VALID),
 307         .formats =              USE_FORMATS,
 308         .rates =                USE_RATE,
 309         .rate_min =             USE_RATE_MIN,
 310         .rate_max =             USE_RATE_MAX,
 311         .channels_min =         USE_CHANNELS_MIN,
 312         .channels_max =         USE_CHANNELS_MAX,
 313         .buffer_bytes_max =     MAX_BUFFER_SIZE,
 314         .period_bytes_min =     64,
 315         .period_bytes_max =     MAX_BUFFER_SIZE,
 316         .periods_min =          USE_PERIODS_MIN,
 317         .periods_max =          USE_PERIODS_MAX,
 318         .fifo_size =            0,
 319 };
 320
 321 static snd_pcm_hardware_t snd_card_dummy_capture =
 322 {
 323         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 324                                  SNDRV_PCM_INFO_MMAP_VALID),
 325         .formats =              USE_FORMATS,
 326         .rates =                USE_RATE,
 327         .rate_min =             USE_RATE_MIN,
 328         .rate_max =             USE_RATE_MAX,
 329         .channels_min =         USE_CHANNELS_MIN,
 330         .channels_max =         USE_CHANNELS_MAX,
 331         .buffer_bytes_max =     MAX_BUFFER_SIZE,
 332         .period_bytes_min =     64,
 333         .period_bytes_max =     MAX_BUFFER_SIZE,
 334         .periods_min =          USE_PERIODS_MIN,
 335         .periods_max =          USE_PERIODS_MAX,
 336         .fifo_size =            0,
 337 };
 338
 339 static void snd_card_dummy_runtime_free(snd_pcm_runtime_t *runtime)
 340 {
 341         snd_card_dummy_pcm_t *dpcm = snd_magic_cast(snd_card_dummy_pcm_t, runtime->private_data, return);
 342         snd_magic_kfree(dpcm);
 343 }
 344
 345 static int snd_card_dummy_playback_open(snd_pcm_substream_t * substream)
 346 {
 347         snd_pcm_runtime_t *runtime = substream->runtime;
 348         snd_card_dummy_pcm_t *dpcm;
 349         int err;
 350
 351         dpcm = snd_magic_kcalloc(snd_card_dummy_pcm_t, 0, GFP_KERNEL);
 352         if (dpcm == NULL)
 353                 return -ENOMEM;
 354         if ((runtime->dma_area = snd_malloc_pages_fallback(MAX_BUFFER_SIZE, GFP_KERNEL, &runtime->dma_bytes)) == NULL) {
 355                 snd_magic_kfree(dpcm);
 356                 return -ENOMEM;
 357         }
 358         init_timer(&dpcm->timer);
 359         dpcm->timer.data = (unsigned long) dpcm;
 360         dpcm->timer.function = snd_card_dummy_pcm_timer_function;
 361         spin_lock_init(&dpcm->lock);
 362         dpcm->substream = substream;
 363         runtime->private_data = dpcm;
 364         runtime->private_free = snd_card_dummy_runtime_free;
 365         runtime->hw = snd_card_dummy_playback;
 366         if (substream->pcm->device & 1) {
 367                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 368                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 369         }
 370         if (substream->pcm->device & 2)
 371                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
 372         if ((err = add_playback_constraints(runtime)) < 0) {
 373                 snd_magic_kfree(dpcm);
 374                 return err;
 375         }
 376
 377         return 0;
 378 }
 379
 380 static int snd_card_dummy_capture_open(snd_pcm_substream_t * substream)
 381 {
 382         snd_pcm_runtime_t *runtime = substream->runtime;
 383         snd_card_dummy_pcm_t *dpcm;
 384         int err;
 385
 386         dpcm = snd_magic_kcalloc(snd_card_dummy_pcm_t, 0, GFP_KERNEL);
 387         if (dpcm == NULL)
 388                 return -ENOMEM;
 389         if ((runtime->dma_area = snd_malloc_pages_fallback(MAX_BUFFER_SIZE, GFP_KERNEL, &runtime->dma_bytes)) == NULL) {
 390                 snd_magic_kfree(dpcm);
 391                 return -ENOMEM;
 392         }
 393         memset(runtime->dma_area, 0, runtime->dma_bytes);
 394         init_timer(&dpcm->timer);
 395         dpcm->timer.data = (unsigned long) dpcm;
 396         dpcm->timer.function = snd_card_dummy_pcm_timer_function;
 397         spin_lock_init(&dpcm->lock);
 398         dpcm->substream = substream;
 399         runtime->private_data = dpcm;
 400         runtime->private_free = snd_card_dummy_runtime_free;
 401         runtime->hw = snd_card_dummy_capture;
 402         if (substream->pcm->device == 1) {
 403                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
 404                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
 405         }
 406         if (substream->pcm->device & 2)
 407                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
 408         if ((err = add_capture_constraints(runtime)) < 0) {
 409                 snd_magic_kfree(dpcm);
 410                 return err;
 411         }
 412
 413         return 0;
 414 }
 415
 416 static int snd_card_dummy_playback_close(snd_pcm_substream_t * substream)
 417 {
 418         snd_pcm_runtime_t *runtime = substream->runtime;
 419
 420         snd_free_pages(runtime->dma_area, runtime->dma_bytes);
 421         return 0;
 422 }
 423
 424 static int snd_card_dummy_capture_close(snd_pcm_substream_t * substream)
 425 {
 426         snd_pcm_runtime_t *runtime = substream->runtime;
 427
 428         snd_free_pages(runtime->dma_area, runtime->dma_bytes);
 429         return 0;
 430 }
 431
 432 static snd_pcm_ops_t snd_card_dummy_playback_ops = {
 433         .open =                 snd_card_dummy_playback_open,
 434         .close =                snd_card_dummy_playback_close,
 435         .ioctl =                snd_card_dummy_playback_ioctl,
 436         .prepare =              snd_card_dummy_playback_prepare,
 437         .trigger =              snd_card_dummy_playback_trigger,
 438         .pointer =              snd_card_dummy_playback_pointer,
 439 };
 440
 441 static snd_pcm_ops_t snd_card_dummy_capture_ops = {
 442         .open =                 snd_card_dummy_capture_open,
 443         .close =                snd_card_dummy_capture_close,
 444         .ioctl =                snd_card_dummy_capture_ioctl,
 445         .prepare =              snd_card_dummy_capture_prepare,
 446         .trigger =              snd_card_dummy_capture_trigger,
 447         .pointer =              snd_card_dummy_capture_pointer,
 448 };
 449
 450 static int __init snd_card_dummy_pcm(snd_card_dummy_t *dummy, int device, int substreams)
 451 {
 452         snd_pcm_t *pcm;
 453         int err;
 454
 455         if ((err = snd_pcm_new(dummy->card, "Dummy PCM", device, substreams, substreams, &pcm)) < 0)
 456                 return err;
 457         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_card_dummy_playback_ops);
 458         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_dummy_capture_ops);
 459         pcm->private_data = dummy;
 460         pcm->info_flags = 0;
 461         strcpy(pcm->name, "Dummy PCM");
 462         return 0;
 463 }
 464
 465 #define DUMMY_VOLUME(xname, xindex, addr) \
 466 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 467   .info = snd_dummy_volume_info, \
 468   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
 469   .private_value = addr }
 470
 471 static int snd_dummy_volume_info(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo)
 472 {
 473         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 474         uinfo->count = 2;
 475         uinfo->value.integer.min = -50;
 476         uinfo->value.integer.max = 100;
 477         return 0;
 478 }
 479
 480 static int snd_dummy_volume_get(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 481 {
 482         snd_card_dummy_t *dummy = _snd_kcontrol_chip(kcontrol);
 483         unsigned long flags;
 484         int addr = kcontrol->private_value;
 485
 486         spin_lock_irqsave(&dummy->mixer_lock, flags);
 487         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
 488         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
 489         spin_unlock_irqrestore(&dummy->mixer_lock, flags);
 490         return 0;
 491 }
 492
 493 static int snd_dummy_volume_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 494 {
 495         snd_card_dummy_t *dummy = _snd_kcontrol_chip(kcontrol);
 496         unsigned long flags;
 497         int change, addr = kcontrol->private_value;
 498         int left, right;
 499
 500         left = ucontrol->value.integer.value[0];
 501         if (left < -50)
 502                 left = -50;
 503         if (left > 100)
 504                 left = 100;
 505         right = ucontrol->value.integer.value[1];
 506         if (right < -50)
 507                 right = -50;
 508         if (right > 100)
 509                 right = 100;
 510         spin_lock_irqsave(&dummy->mixer_lock, flags);
 511         change = dummy->mixer_volume[addr][0] != left ||
 512                  dummy->mixer_volume[addr][1] != right;
 513         dummy->mixer_volume[addr][0] = left;
 514         dummy->mixer_volume[addr][1] = right;
 515         spin_unlock_irqrestore(&dummy->mixer_lock, flags);
 516         return change;
 517 }
 518
 519 #define DUMMY_CAPSRC(xname, xindex, addr) \
 520 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 521   .info = snd_dummy_capsrc_info, \
 522   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
 523   .private_value = addr }
 524
 525 static int snd_dummy_capsrc_info(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo)
 526 {
 527         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
 528         uinfo->count = 2;
 529         uinfo->value.integer.min = 0;
 530         uinfo->value.integer.max = 1;
 531         return 0;
 532 }
 533
 534 static int snd_dummy_capsrc_get(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 535 {
 536         snd_card_dummy_t *dummy = _snd_kcontrol_chip(kcontrol);
 537         unsigned long flags;
 538         int addr = kcontrol->private_value;
 539
 540         spin_lock_irqsave(&dummy->mixer_lock, flags);
 541         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
 542         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
 543         spin_unlock_irqrestore(&dummy->mixer_lock, flags);
 544         return 0;
 545 }
 546
 547 static int snd_dummy_capsrc_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 548 {
 549         snd_card_dummy_t *dummy = _snd_kcontrol_chip(kcontrol);
 550         unsigned long flags;
 551         int change, addr = kcontrol->private_value;
 552         int left, right;
 553
 554         left = ucontrol->value.integer.value[0] & 1;
 555         right = ucontrol->value.integer.value[1] & 1;
 556         spin_lock_irqsave(&dummy->mixer_lock, flags);
 557         change = dummy->capture_source[addr][0] != left &&
 558                  dummy->capture_source[addr][1] != right;
 559         dummy->capture_source[addr][0] = left;
 560         dummy->capture_source[addr][1] = right;
 561         spin_unlock_irqrestore(&dummy->mixer_lock, flags);
 562         return change;
 563 }
 564
 565 #define DUMMY_CONTROLS (sizeof(snd_dummy_controls)/sizeof(snd_kcontrol_new_t))
 566
 567 static snd_kcontrol_new_t snd_dummy_controls[] = {
 568 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
 569 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
 570 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
 571 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_MASTER),
 572 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
 573 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_MASTER),
 574 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
 575 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MASTER),
 576 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
 577 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_MASTER)
 578 };
 579
 580 int __init snd_card_dummy_new_mixer(snd_card_dummy_t * dummy)
 581 {
 582         snd_card_t *card = dummy->card;
 583         unsigned int idx;
 584         int err;
 585
 586         snd_assert(dummy != NULL, return -EINVAL);
 587         spin_lock_init(&dummy->mixer_lock);
 588         strcpy(card->mixername, "Dummy Mixer");
 589
 590         for (idx = 0; idx < DUMMY_CONTROLS; idx++) {
 591                 if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy))) < 0)
 592                         return err;
 593         }
 594         return 0;
 595 }
 596
 597 static int __init snd_card_dummy_probe(int dev)
 598 {
 599         snd_card_t *card;
 600         struct snd_card_dummy *dummy;
 601         int idx, err;
 602
 603         if (!enable[dev])
 604                 return -ENODEV;
 605         card = snd_card_new(index[dev], id[dev], THIS_MODULE,
 606                             sizeof(struct snd_card_dummy));
 607         if (card == NULL)
 608                 return -ENOMEM;
 609         dummy = (struct snd_card_dummy *)card->private_data;
 610         dummy->card = card;
 611         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
 612                 if (pcm_substreams[dev] < 1)
 613                         pcm_substreams[dev] = 1;
 614                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
 615                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
 616                 if ((err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev])) < 0)
 617                         goto __nodev;
 618         }
 619         if ((err = snd_card_dummy_new_mixer(dummy)) < 0)
 620                 goto __nodev;
 621         strcpy(card->driver, "Dummy");
 622         strcpy(card->shortname, "Dummy");
 623         sprintf(card->longname, "Dummy %i", dev + 1);
 624         if ((err = snd_card_register(card)) == 0) {
 625                 snd_dummy_cards[dev] = card;
 626                 return 0;
 627         }
 628       __nodev:
 629         snd_card_free(card);
 630         return err;
 631 }
 632
 633 static int __init alsa_card_dummy_init(void)
 634 {
 635         int dev, cards;
 636
 637         for (dev = cards = 0; dev < SNDRV_CARDS && enable[dev]; dev++) {
 638                 if (snd_card_dummy_probe(dev) < 0) {
 639 #ifdef MODULE
 640                         printk(KERN_ERR "Dummy soundcard #%i not found or device busy\n", dev + 1);
 641 #endif
 642                         break;
 643                 }
 644                 cards++;
 645         }
 646         if (!cards) {
 647 #ifdef MODULE
 648                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
 649 #endif
 650                 return -ENODEV;
 651         }
 652         return 0;
 653 }
 654
 655 static void __exit alsa_card_dummy_exit(void)
 656 {
 657         int idx;
 658
 659         for (idx = 0; idx < SNDRV_CARDS; idx++)
 660                 snd_card_free(snd_dummy_cards[idx]);
 661 }
 662
 663 module_init(alsa_card_dummy_init)
 664 module_exit(alsa_card_dummy_exit)