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dummy.c

/*
 *  Dummy soundcard
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <linux/init.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/jiffies.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/wait.h>
#include <linux/moduleparam.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/tlv.h>
#include <sound/pcm.h>
#include <sound/rawmidi.h>
#include <sound/initval.h>

MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("Dummy soundcard (/dev/null)");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{ALSA,Dummy soundcard}}");

#define MAX_PCM_DEVICES       4
#define MAX_PCM_SUBSTREAMS    16
#define MAX_MIDI_DEVICES      2

#if 0 /* emu10k1 emulation */
#define MAX_BUFFER_SIZE       (128 * 1024)
static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime)
{
      int err;
      err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
      if (err < 0)
            return err;
      err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX);
      if (err < 0)
            return err;
      return 0;
}
#define add_playback_constraints emu10k1_playback_constraints
#endif

#if 0 /* RME9652 emulation */
#define MAX_BUFFER_SIZE       (26 * 64 * 1024)
#define USE_FORMATS           SNDRV_PCM_FMTBIT_S32_LE
#define USE_CHANNELS_MIN      26
#define USE_CHANNELS_MAX      26
#define USE_PERIODS_MIN       2
#define USE_PERIODS_MAX       2
#endif

#if 0 /* ICE1712 emulation */
#define MAX_BUFFER_SIZE       (256 * 1024)
#define USE_FORMATS           SNDRV_PCM_FMTBIT_S32_LE
#define USE_CHANNELS_MIN      10
#define USE_CHANNELS_MAX      10
#define USE_PERIODS_MIN       1
#define USE_PERIODS_MAX       1024
#endif

#if 0 /* UDA1341 emulation */
#define MAX_BUFFER_SIZE       (16380)
#define USE_FORMATS           SNDRV_PCM_FMTBIT_S16_LE
#define USE_CHANNELS_MIN      2
#define USE_CHANNELS_MAX      2
#define USE_PERIODS_MIN       2
#define USE_PERIODS_MAX       255
#endif

#if 0 /* simple AC97 bridge (intel8x0) with 48kHz AC97 only codec */
#define USE_FORMATS           SNDRV_PCM_FMTBIT_S16_LE
#define USE_CHANNELS_MIN      2
#define USE_CHANNELS_MAX      2
#define USE_RATE        SNDRV_PCM_RATE_48000
#define USE_RATE_MIN          48000
#define USE_RATE_MAX          48000
#endif

#if 0 /* CA0106 */
#define USE_FORMATS           SNDRV_PCM_FMTBIT_S16_LE
#define USE_CHANNELS_MIN      2
#define USE_CHANNELS_MAX      2
#define USE_RATE        (SNDRV_PCM_RATE_48000|SNDRV_PCM_RATE_96000|SNDRV_PCM_RATE_192000) 
#define USE_RATE_MIN          48000 
#define USE_RATE_MAX          192000
#define MAX_BUFFER_SIZE       ((65536-64)*8)
#define MAX_PERIOD_SIZE       (65536-64)
#define USE_PERIODS_MIN       2
#define USE_PERIODS_MAX       8
#endif


/* defaults */
#ifndef MAX_BUFFER_SIZE
#define MAX_BUFFER_SIZE       (64*1024)
#endif
#ifndef MAX_PERIOD_SIZE
#define MAX_PERIOD_SIZE       MAX_BUFFER_SIZE
#endif
#ifndef USE_FORMATS
#define USE_FORMATS           (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)
#endif
#ifndef USE_RATE
#define USE_RATE        SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000
#define USE_RATE_MIN          5500
#define USE_RATE_MAX          48000
#endif
#ifndef USE_CHANNELS_MIN
#define USE_CHANNELS_MIN      1
#endif
#ifndef USE_CHANNELS_MAX
#define USE_CHANNELS_MAX      2
#endif
#ifndef USE_PERIODS_MIN
#define USE_PERIODS_MIN       1
#endif
#ifndef USE_PERIODS_MAX
#define USE_PERIODS_MAX       1024
#endif
#ifndef add_playback_constraints
#define add_playback_constraints(x) 0
#endif
#ifndef add_capture_constraints
#define add_capture_constraints(x) 0
#endif

static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;    /* Index 0-MAX */
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;     /* ID for this card */
static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
//static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};

module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
module_param_array(pcm_devs, int, NULL, 0444);
MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
module_param_array(pcm_substreams, int, NULL, 0444);
MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-16) for dummy driver.");
//module_param_array(midi_devs, int, NULL, 0444);
//MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");

static struct platform_device *devices[SNDRV_CARDS];

#define MIXER_ADDR_MASTER     0
#define MIXER_ADDR_LINE       1
#define MIXER_ADDR_MIC        2
#define MIXER_ADDR_SYNTH      3
#define MIXER_ADDR_CD         4
#define MIXER_ADDR_LAST       4

struct snd_dummy {
      struct snd_card *card;
      struct snd_pcm *pcm;
      spinlock_t mixer_lock;
      int mixer_volume[MIXER_ADDR_LAST+1][2];
      int capture_source[MIXER_ADDR_LAST+1][2];
};

struct snd_dummy_pcm {
      struct snd_dummy *dummy;
      spinlock_t lock;
      struct timer_list timer;
      unsigned int pcm_buffer_size;
      unsigned int pcm_period_size;
      unsigned int pcm_bps;         /* bytes per second */
      unsigned int pcm_hz;          /* HZ */
      unsigned int pcm_irq_pos;     /* IRQ position */
      unsigned int pcm_buf_pos;     /* position in buffer */
      struct snd_pcm_substream *substream;
};


static inline void snd_card_dummy_pcm_timer_start(struct snd_dummy_pcm *dpcm)
{
      dpcm->timer.expires = 1 + jiffies;
      add_timer(&dpcm->timer);
}

static inline void snd_card_dummy_pcm_timer_stop(struct snd_dummy_pcm *dpcm)
{
      del_timer(&dpcm->timer);
}

static int snd_card_dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      struct snd_dummy_pcm *dpcm = runtime->private_data;
      int err = 0;

      spin_lock(&dpcm->lock);
      switch (cmd) {
      case SNDRV_PCM_TRIGGER_START:
      case SNDRV_PCM_TRIGGER_RESUME:
            snd_card_dummy_pcm_timer_start(dpcm);
            break;
      case SNDRV_PCM_TRIGGER_STOP:
      case SNDRV_PCM_TRIGGER_SUSPEND:
            snd_card_dummy_pcm_timer_stop(dpcm);
            break;
      default:
            err = -EINVAL;
            break;
      }
      spin_unlock(&dpcm->lock);
      return 0;
}

static int snd_card_dummy_pcm_prepare(struct snd_pcm_substream *substream)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      struct snd_dummy_pcm *dpcm = runtime->private_data;
      int bps;

      bps = snd_pcm_format_width(runtime->format) * runtime->rate *
            runtime->channels / 8;

      if (bps <= 0)
            return -EINVAL;

      dpcm->pcm_bps = bps;
      dpcm->pcm_hz = HZ;
      dpcm->pcm_buffer_size = snd_pcm_lib_buffer_bytes(substream);
      dpcm->pcm_period_size = snd_pcm_lib_period_bytes(substream);
      dpcm->pcm_irq_pos = 0;
      dpcm->pcm_buf_pos = 0;

      snd_pcm_format_set_silence(runtime->format, runtime->dma_area,
                  bytes_to_samples(runtime, runtime->dma_bytes));

      return 0;
}

static void snd_card_dummy_pcm_timer_function(unsigned long data)
{
      struct snd_dummy_pcm *dpcm = (struct snd_dummy_pcm *)data;
      unsigned long flags;
      
      spin_lock_irqsave(&dpcm->lock, flags);
      dpcm->timer.expires = 1 + jiffies;
      add_timer(&dpcm->timer);
      dpcm->pcm_irq_pos += dpcm->pcm_bps;
      dpcm->pcm_buf_pos += dpcm->pcm_bps;
      dpcm->pcm_buf_pos %= dpcm->pcm_buffer_size * dpcm->pcm_hz;
      if (dpcm->pcm_irq_pos >= dpcm->pcm_period_size * dpcm->pcm_hz) {
            dpcm->pcm_irq_pos %= dpcm->pcm_period_size * dpcm->pcm_hz;
            spin_unlock_irqrestore(&dpcm->lock, flags);
            snd_pcm_period_elapsed(dpcm->substream);
      } else
            spin_unlock_irqrestore(&dpcm->lock, flags);
}

static snd_pcm_uframes_t snd_card_dummy_pcm_pointer(struct snd_pcm_substream *substream)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      struct snd_dummy_pcm *dpcm = runtime->private_data;

      return bytes_to_frames(runtime, dpcm->pcm_buf_pos / dpcm->pcm_hz);
}

static struct snd_pcm_hardware snd_card_dummy_playback =
{
      .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
                         SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
      .formats =        USE_FORMATS,
      .rates =          USE_RATE,
      .rate_min =       USE_RATE_MIN,
      .rate_max =       USE_RATE_MAX,
      .channels_min =         USE_CHANNELS_MIN,
      .channels_max =         USE_CHANNELS_MAX,
      .buffer_bytes_max =     MAX_BUFFER_SIZE,
      .period_bytes_min =     64,
      .period_bytes_max =     MAX_PERIOD_SIZE,
      .periods_min =          USE_PERIODS_MIN,
      .periods_max =          USE_PERIODS_MAX,
      .fifo_size =            0,
};

static struct snd_pcm_hardware snd_card_dummy_capture =
{
      .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
                         SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
      .formats =        USE_FORMATS,
      .rates =          USE_RATE,
      .rate_min =       USE_RATE_MIN,
      .rate_max =       USE_RATE_MAX,
      .channels_min =         USE_CHANNELS_MIN,
      .channels_max =         USE_CHANNELS_MAX,
      .buffer_bytes_max =     MAX_BUFFER_SIZE,
      .period_bytes_min =     64,
      .period_bytes_max =     MAX_PERIOD_SIZE,
      .periods_min =          USE_PERIODS_MIN,
      .periods_max =          USE_PERIODS_MAX,
      .fifo_size =            0,
};

static void snd_card_dummy_runtime_free(struct snd_pcm_runtime *runtime)
{
      kfree(runtime->private_data);
}

static int snd_card_dummy_hw_params(struct snd_pcm_substream *substream,
                            struct snd_pcm_hw_params *hw_params)
{
      return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
}

static int snd_card_dummy_hw_free(struct snd_pcm_substream *substream)
{
      return snd_pcm_lib_free_pages(substream);
}

static struct snd_dummy_pcm *new_pcm_stream(struct snd_pcm_substream *substream)
{
      struct snd_dummy_pcm *dpcm;

      dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
      if (! dpcm)
            return dpcm;
      init_timer(&dpcm->timer);
      dpcm->timer.data = (unsigned long) dpcm;
      dpcm->timer.function = snd_card_dummy_pcm_timer_function;
      spin_lock_init(&dpcm->lock);
      dpcm->substream = substream;
      return dpcm;
}

static int snd_card_dummy_playback_open(struct snd_pcm_substream *substream)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      struct snd_dummy_pcm *dpcm;
      int err;

      if ((dpcm = new_pcm_stream(substream)) == NULL)
            return -ENOMEM;
      runtime->private_data = dpcm;
      /* makes the infrastructure responsible for freeing dpcm */
      runtime->private_free = snd_card_dummy_runtime_free;
      runtime->hw = snd_card_dummy_playback;
      if (substream->pcm->device & 1) {
            runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
            runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
      }
      if (substream->pcm->device & 2)
            runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
      err = add_playback_constraints(runtime);
      if (err < 0)
            return err;

      return 0;
}

static int snd_card_dummy_capture_open(struct snd_pcm_substream *substream)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      struct snd_dummy_pcm *dpcm;
      int err;

      if ((dpcm = new_pcm_stream(substream)) == NULL)
            return -ENOMEM;
      runtime->private_data = dpcm;
      /* makes the infrastructure responsible for freeing dpcm */
      runtime->private_free = snd_card_dummy_runtime_free;
      runtime->hw = snd_card_dummy_capture;
      if (substream->pcm->device == 1) {
            runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
            runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
      }
      if (substream->pcm->device & 2)
            runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
      err = add_capture_constraints(runtime);
      if (err < 0)
            return err;

      return 0;
}

static int snd_card_dummy_playback_close(struct snd_pcm_substream *substream)
{
      return 0;
}

static int snd_card_dummy_capture_close(struct snd_pcm_substream *substream)
{
      return 0;
}

static struct snd_pcm_ops snd_card_dummy_playback_ops = {
      .open =                 snd_card_dummy_playback_open,
      .close =          snd_card_dummy_playback_close,
      .ioctl =          snd_pcm_lib_ioctl,
      .hw_params =            snd_card_dummy_hw_params,
      .hw_free =        snd_card_dummy_hw_free,
      .prepare =        snd_card_dummy_pcm_prepare,
      .trigger =        snd_card_dummy_pcm_trigger,
      .pointer =        snd_card_dummy_pcm_pointer,
};

static struct snd_pcm_ops snd_card_dummy_capture_ops = {
      .open =                 snd_card_dummy_capture_open,
      .close =          snd_card_dummy_capture_close,
      .ioctl =          snd_pcm_lib_ioctl,
      .hw_params =            snd_card_dummy_hw_params,
      .hw_free =        snd_card_dummy_hw_free,
      .prepare =        snd_card_dummy_pcm_prepare,
      .trigger =        snd_card_dummy_pcm_trigger,
      .pointer =        snd_card_dummy_pcm_pointer,
};

static int __devinit snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
                              int substreams)
{
      struct snd_pcm *pcm;
      int err;

      err = snd_pcm_new(dummy->card, "Dummy PCM", device,
                         substreams, substreams, &pcm);
      if (err < 0)
            return err;
      dummy->pcm = pcm;
      snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_card_dummy_playback_ops);
      snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_dummy_capture_ops);
      pcm->private_data = dummy;
      pcm->info_flags = 0;
      strcpy(pcm->name, "Dummy PCM");
      snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
                                    snd_dma_continuous_data(GFP_KERNEL),
                                    0, 64*1024);
      return 0;
}

#define DUMMY_VOLUME(xname, xindex, addr) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
  .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
  .name = xname, .index = xindex, \
  .info = snd_dummy_volume_info, \
  .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
  .private_value = addr, \
  .tlv = { .p = db_scale_dummy } }

static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
                         struct snd_ctl_elem_info *uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
      uinfo->count = 2;
      uinfo->value.integer.min = -50;
      uinfo->value.integer.max = 100;
      return 0;
}
 
static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
                        struct snd_ctl_elem_value *ucontrol)
{
      struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
      int addr = kcontrol->private_value;

      spin_lock_irq(&dummy->mixer_lock);
      ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
      ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
      spin_unlock_irq(&dummy->mixer_lock);
      return 0;
}

static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
                        struct snd_ctl_elem_value *ucontrol)
{
      struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
      int change, addr = kcontrol->private_value;
      int left, right;

      left = ucontrol->value.integer.value[0];
      if (left < -50)
            left = -50;
      if (left > 100)
            left = 100;
      right = ucontrol->value.integer.value[1];
      if (right < -50)
            right = -50;
      if (right > 100)
            right = 100;
      spin_lock_irq(&dummy->mixer_lock);
      change = dummy->mixer_volume[addr][0] != left ||
               dummy->mixer_volume[addr][1] != right;
      dummy->mixer_volume[addr][0] = left;
      dummy->mixer_volume[addr][1] = right;
      spin_unlock_irq(&dummy->mixer_lock);
      return change;
}

static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);

#define DUMMY_CAPSRC(xname, xindex, addr) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
  .info = snd_dummy_capsrc_info, \
  .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
  .private_value = addr }

#define snd_dummy_capsrc_info snd_ctl_boolean_stereo_info
 
static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
                        struct snd_ctl_elem_value *ucontrol)
{
      struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
      int addr = kcontrol->private_value;

      spin_lock_irq(&dummy->mixer_lock);
      ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
      ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
      spin_unlock_irq(&dummy->mixer_lock);
      return 0;
}

static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
      struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
      int change, addr = kcontrol->private_value;
      int left, right;

      left = ucontrol->value.integer.value[0] & 1;
      right = ucontrol->value.integer.value[1] & 1;
      spin_lock_irq(&dummy->mixer_lock);
      change = dummy->capture_source[addr][0] != left &&
               dummy->capture_source[addr][1] != right;
      dummy->capture_source[addr][0] = left;
      dummy->capture_source[addr][1] = right;
      spin_unlock_irq(&dummy->mixer_lock);
      return change;
}

static struct snd_kcontrol_new snd_dummy_controls[] = {
DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD)
};

static int __devinit snd_card_dummy_new_mixer(struct snd_dummy *dummy)
{
      struct snd_card *card = dummy->card;
      unsigned int idx;
      int err;

      if (snd_BUG_ON(!dummy))
            return -EINVAL;
      spin_lock_init(&dummy->mixer_lock);
      strcpy(card->mixername, "Dummy Mixer");

      for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
            err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy));
            if (err < 0)
                  return err;
      }
      return 0;
}

static int __devinit snd_dummy_probe(struct platform_device *devptr)
{
      struct snd_card *card;
      struct snd_dummy *dummy;
      int idx, err;
      int dev = devptr->id;

      err = snd_card_create(index[dev], id[dev], THIS_MODULE,
                        sizeof(struct snd_dummy), &card);
      if (err < 0)
            return err;
      dummy = card->private_data;
      dummy->card = card;
      for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
            if (pcm_substreams[dev] < 1)
                  pcm_substreams[dev] = 1;
            if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
                  pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
            err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
            if (err < 0)
                  goto __nodev;
      }
      err = snd_card_dummy_new_mixer(dummy);
      if (err < 0)
            goto __nodev;
      strcpy(card->driver, "Dummy");
      strcpy(card->shortname, "Dummy");
      sprintf(card->longname, "Dummy %i", dev + 1);

      snd_card_set_dev(card, &devptr->dev);

      err = snd_card_register(card);
      if (err == 0) {
            platform_set_drvdata(devptr, card);
            return 0;
      }
      __nodev:
      snd_card_free(card);
      return err;
}

static int __devexit snd_dummy_remove(struct platform_device *devptr)
{
      snd_card_free(platform_get_drvdata(devptr));
      platform_set_drvdata(devptr, NULL);
      return 0;
}

#ifdef CONFIG_PM
static int snd_dummy_suspend(struct platform_device *pdev, pm_message_t state)
{
      struct snd_card *card = platform_get_drvdata(pdev);
      struct snd_dummy *dummy = card->private_data;

      snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
      snd_pcm_suspend_all(dummy->pcm);
      return 0;
}
      
static int snd_dummy_resume(struct platform_device *pdev)
{
      struct snd_card *card = platform_get_drvdata(pdev);

      snd_power_change_state(card, SNDRV_CTL_POWER_D0);
      return 0;
}
#endif

#define SND_DUMMY_DRIVER      "snd_dummy"

static struct platform_driver snd_dummy_driver = {
      .probe            = snd_dummy_probe,
      .remove           = __devexit_p(snd_dummy_remove),
#ifdef CONFIG_PM
      .suspend    = snd_dummy_suspend,
      .resume           = snd_dummy_resume,
#endif
      .driver           = {
            .name = SND_DUMMY_DRIVER
      },
};

static void snd_dummy_unregister_all(void)
{
      int i;

      for (i = 0; i < ARRAY_SIZE(devices); ++i)
            platform_device_unregister(devices[i]);
      platform_driver_unregister(&snd_dummy_driver);
}

static int __init alsa_card_dummy_init(void)
{
      int i, cards, err;

      err = platform_driver_register(&snd_dummy_driver);
      if (err < 0)
            return err;

      cards = 0;
      for (i = 0; i < SNDRV_CARDS; i++) {
            struct platform_device *device;
            if (! enable[i])
                  continue;
            device = platform_device_register_simple(SND_DUMMY_DRIVER,
                                           i, NULL, 0);
            if (IS_ERR(device))
                  continue;
            if (!platform_get_drvdata(device)) {
                  platform_device_unregister(device);
                  continue;
            }
            devices[i] = device;
            cards++;
      }
      if (!cards) {
#ifdef MODULE
            printk(KERN_ERR "Dummy soundcard not found or device busy\n");
#endif
            snd_dummy_unregister_all();
            return -ENODEV;
      }
      return 0;
}

static void __exit alsa_card_dummy_exit(void)
{
      snd_dummy_unregister_all();
}

module_init(alsa_card_dummy_init)
module_exit(alsa_card_dummy_exit)

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