/*
 *  Dummy soundcard
 *  Copyright (c) by Jaroslav Kysela <perex@suse.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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#define SNDRV_MAIN_OBJECT_FILE
#include <sound/driver.h>
#include <sound/control.h>
#include <sound/pcm.h>
#include <sound/rawmidi.h>
#define SNDRV_GET_ID
#include <sound/initval.h>

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

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


#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


/* defaults */
#ifndef MAX_BUFFER_SIZE
#define MAX_BUFFER_SIZE		(64*1024)
#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

static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;	/* Index 0-MAX */
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;	/* ID for this card */
#if 0
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};
#else
static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE;
static int pcm_devs[SNDRV_CARDS] = SNDDRV_DEFAULT_PCM_DEVS;
static int pcm_substreams[SNDRV_CARDS] = SNDDRV_DEFAULT_PCM_SUBSTREAMS;
#endif
//static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};

MODULE_PARM(index, "1-" __MODULE_STRING(SNDRV_CARDS) "i");
MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
MODULE_PARM_SYNTAX(index, SNDRV_INDEX_DESC);
MODULE_PARM(id, "1-" __MODULE_STRING(SNDRV_CARDS) "s");
MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
MODULE_PARM_SYNTAX(id, SNDRV_ID_DESC);
MODULE_PARM(enable, "1-" __MODULE_STRING(SNDRV_CARDS) "i");
MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
MODULE_PARM_SYNTAX(enable, SNDRV_ENABLE_DESC);
MODULE_PARM(pcm_devs, "1-" __MODULE_STRING(SNDRV_CARDS) "i");
MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
MODULE_PARM_SYNTAX(pcm_devs, SNDRV_ENABLED ",allows:{{0,4}},default:1,dialog:list");
MODULE_PARM(pcm_substreams, "1-" __MODULE_STRING(SNDRV_CARDS) "i");
MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-16) for dummy driver.");
MODULE_PARM_SYNTAX(pcm_substreams, SNDRV_ENABLED ",allows:{{1,16}},default:8,dialog:list");
//MODULE_PARM(midi_devs, "1-" __MODULE_STRING(SNDRV_CARDS) "i");
//MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
//MODULE_PARM_SYNTAX(midi_devs, SNDRV_ENABLED ",allows:{{0,2}},default:8,dialog:list");
#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

typedef struct snd_card_dummy {
    snd_card_t *card;
    spinlock_t mixer_lock;
    int mixer_volume[MIXER_ADDR_LAST+1][2];
    int capture_source[MIXER_ADDR_LAST+1][2];
} snd_card_dummy_t;

typedef struct snd_card_dummy_pcm {
    snd_card_dummy_t *dummy;
    spinlock_t lock;
    struct timer_list timer;
    unsigned int pcm_size;
    unsigned int pcm_count;
    unsigned int pcm_bps;		/* bytes per second */
    unsigned int pcm_jiffie;	/* bytes per one jiffie */
    unsigned int pcm_irq_pos;	/* IRQ position */
    unsigned int pcm_buf_pos;	/* position in buffer */
    snd_pcm_substream_t *substream;
} snd_card_dummy_pcm_t;

static snd_card_t *snd_dummy_cards[SNDRV_CARDS] = SNDRV_DEFAULT_PTR;


static int snd_card_dummy_playback_ioctl(snd_pcm_substream_t * substream,
                                         unsigned int cmd,
                                         void *arg)
{
    return snd_pcm_lib_ioctl(substream, cmd, arg);
}

static int snd_card_dummy_capture_ioctl(snd_pcm_substream_t * substream,
                                        unsigned int cmd,
                                        void *arg)
{
    return snd_pcm_lib_ioctl(substream, cmd, arg);
}

static void snd_card_dummy_pcm_timer_start(snd_pcm_substream_t * substream)
{
    snd_pcm_runtime_t *runtime = substream->runtime;
    snd_card_dummy_pcm_t *dpcm = runtime->private_data;

    dpcm->timer.expires = 1 + jiffies;
    add_timer(&dpcm->timer);
}

static void snd_card_dummy_pcm_timer_stop(snd_pcm_substream_t * substream)
{
    snd_pcm_runtime_t *runtime = substream->runtime;
    snd_card_dummy_pcm_t *dpcm = runtime->private_data;

    del_timer(&dpcm->timer);
}

static int snd_card_dummy_playback_trigger(snd_pcm_substream_t * substream,
                                           int cmd)
{
    if (cmd == SNDRV_PCM_TRIGGER_START) {
        snd_card_dummy_pcm_timer_start(substream);
    } else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
        snd_card_dummy_pcm_timer_stop(substream);
    } else {
        return -EINVAL;
    }
    return 0;
}

static int snd_card_dummy_capture_trigger(snd_pcm_substream_t * substream,
                                          int cmd)
{
    if (cmd == SNDRV_PCM_TRIGGER_START) {
        snd_card_dummy_pcm_timer_start(substream);
    } else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
        snd_card_dummy_pcm_timer_stop(substream);
    } else {
        return -EINVAL;
    }
    return 0;
}

static int snd_card_dummy_pcm_prepare(snd_pcm_substream_t * substream)
{
    snd_pcm_runtime_t *runtime = substream->runtime;
    snd_card_dummy_pcm_t *dpcm = runtime->private_data;
    unsigned int bps;

    bps = runtime->rate * runtime->channels;
    bps *= snd_pcm_format_width(runtime->format);
    bps /= 8;
    if (bps == 0)
        return -EINVAL;
    dpcm->pcm_bps = bps;
    dpcm->pcm_jiffie = bps / HZ;
    dpcm->pcm_size = snd_pcm_lib_buffer_bytes(substream);
    dpcm->pcm_count = snd_pcm_lib_period_bytes(substream);
    dpcm->pcm_irq_pos = 0;
    dpcm->pcm_buf_pos = 0;
    return 0;
}

static int snd_card_dummy_playback_prepare(snd_pcm_substream_t * substream)
{
    return snd_card_dummy_pcm_prepare(substream);
}

static int snd_card_dummy_capture_prepare(snd_pcm_substream_t * substream)
{
    return snd_card_dummy_pcm_prepare(substream);
}

static void snd_card_dummy_pcm_timer_function(unsigned long data)
{
    snd_card_dummy_pcm_t *dpcm = (snd_card_dummy_pcm_t *)data;

    dpcm->timer.expires = 1 + jiffies;
    add_timer(&dpcm->timer);
    spin_lock_irq(&dpcm->lock);
    dpcm->pcm_irq_pos += dpcm->pcm_jiffie;
    dpcm->pcm_buf_pos += dpcm->pcm_jiffie;
    dpcm->pcm_buf_pos %= dpcm->pcm_size;
    if (dpcm->pcm_irq_pos >= dpcm->pcm_count) {
        dpcm->pcm_irq_pos %= dpcm->pcm_count;
        snd_pcm_period_elapsed(dpcm->substream);
    }
    spin_unlock_irq(&dpcm->lock);
}

static snd_pcm_uframes_t snd_card_dummy_playback_pointer(snd_pcm_substream_t * substream)
{
    snd_pcm_runtime_t *runtime = substream->runtime;
    snd_card_dummy_pcm_t *dpcm = runtime->private_data;

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

static snd_pcm_uframes_t snd_card_dummy_capture_pointer(snd_pcm_substream_t * substream)
{
    snd_pcm_runtime_t *runtime = substream->runtime;
    snd_card_dummy_pcm_t *dpcm = runtime->private_data;

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

static snd_pcm_hardware_t snd_card_dummy_playback =
{
    /*	info:		  */   (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
                                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_BUFFER_SIZE,
                                /*	periods_min:	  */	USE_PERIODS_MIN,
                                /*	periods_max:	  */	USE_PERIODS_MAX,
                                /*	fifo_size:	  */	0,
};

static snd_pcm_hardware_t snd_card_dummy_capture =
{
    /*	info:		  */	(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
                                 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_BUFFER_SIZE,
                                 /*	periods_min:	  */	USE_PERIODS_MIN,
                                 /*	periods_max:	  */	USE_PERIODS_MAX,
                                 /*	fifo_size:	  */	0,
};

static void snd_card_dummy_runtime_free(snd_pcm_runtime_t *runtime)
{
    snd_card_dummy_pcm_t *dpcm = runtime->private_data;
    kfree(dpcm);
}

// 12 Jun 07 SHL fixme to be in some .h
extern void * snd_malloc_pages_fallback(size_t size, unsigned int flags, size_t *res_size);

static int snd_card_dummy_playback_open(snd_pcm_substream_t * substream)
{
    snd_pcm_runtime_t *runtime = substream->runtime;
    snd_card_dummy_pcm_t *dpcm;

    dpcm = kcalloc(1, sizeof(*dpcm), GFP_KERNEL);
    if (dpcm == NULL)
        return -ENOMEM;
    if ((runtime->dma_area = snd_malloc_pages_fallback(MAX_BUFFER_SIZE, GFP_KERNEL, &runtime->dma_bytes)) == NULL) {
        kfree(dpcm);
        return -ENOMEM;
    }
    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;
    runtime->private_data = 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);
    return 0;
}

static int snd_card_dummy_capture_open(snd_pcm_substream_t * substream)
{
    snd_pcm_runtime_t *runtime = substream->runtime;
    snd_card_dummy_pcm_t *dpcm;

    dpcm = kcalloc(1, sizeof(*dpcm), GFP_KERNEL);
    if (dpcm == NULL)
        return -ENOMEM;
    if ((runtime->dma_area = snd_malloc_pages_fallback(MAX_BUFFER_SIZE, GFP_KERNEL, &runtime->dma_bytes)) == NULL) {
        kfree(dpcm);
        return -ENOMEM;
    }
    memset(runtime->dma_area, 0, runtime->dma_bytes);
    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;
    runtime->private_data = 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);
    return 0;
}

static int snd_card_dummy_playback_close(snd_pcm_substream_t * substream)
{
    snd_pcm_runtime_t *runtime = substream->runtime;

    snd_free_pages(runtime->dma_area, runtime->dma_bytes);
    return 0;
}

static int snd_card_dummy_capture_close(snd_pcm_substream_t * substream)
{
    snd_pcm_runtime_t *runtime = substream->runtime;

    snd_free_pages(runtime->dma_area, runtime->dma_bytes);
    return 0;
}

static snd_pcm_ops_t snd_card_dummy_playback_ops = {
    /*	open:		*/	snd_card_dummy_playback_open,
    /*	close:		*/	snd_card_dummy_playback_close,
    /*	ioctl:		*/	snd_card_dummy_playback_ioctl,
    NULL, NULL,
    /*	prepare:	*/	snd_card_dummy_playback_prepare,
    /*	trigger:	*/	snd_card_dummy_playback_trigger,
    /*	pointer:	*/	snd_card_dummy_playback_pointer,
    NULL, NULL
};

static snd_pcm_ops_t snd_card_dummy_capture_ops = {
    /*	open:		*/	snd_card_dummy_capture_open,
    /*	close:		*/	snd_card_dummy_capture_close,
    /*	ioctl:		*/	snd_card_dummy_capture_ioctl,
    NULL, NULL,
    /*	prepare:	*/	snd_card_dummy_capture_prepare,
    /*	trigger:	*/	snd_card_dummy_capture_trigger,
    /*	pointer:	*/	snd_card_dummy_capture_pointer,
    NULL, NULL
};

static int __init snd_card_dummy_pcm(snd_card_dummy_t *dummy, int device, int substreams)
{
    snd_pcm_t *pcm;
    int err;

    if ((err = snd_pcm_new(dummy->card, "Dummy PCM", device, substreams, substreams, &pcm)) < 0)
        return err;
    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");
    return 0;
}
#define DUMMY_VOLUME(xname, xindex, addr) \
    { SNDRV_CTL_ELEM_IFACE_MIXER, 0, 0, xname, xindex, \
    0, 0, snd_dummy_volume_info, \
    snd_dummy_volume_get, snd_dummy_volume_put, \
    0, \
    addr }

static int snd_dummy_volume_info(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * 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(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
{
    snd_card_dummy_t *dummy = snd_kcontrol_chip(kcontrol);
    unsigned long flags;
    int addr = kcontrol->private_value;

    spin_lock_irqsave(&dummy->mixer_lock, flags);
    ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
    ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
    spin_unlock_irqrestore(&dummy->mixer_lock, flags);
    return 0;
}

static int snd_dummy_volume_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
{
    snd_card_dummy_t *dummy = snd_kcontrol_chip(kcontrol);
    unsigned long flags;
    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_irqsave(&dummy->mixer_lock, flags);
    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_irqrestore(&dummy->mixer_lock, flags);
    return change;
}

#define DUMMY_CAPSRC(xname, xindex, addr) \
    { SNDRV_CTL_ELEM_IFACE_MIXER, 0, 0, xname, xindex, \
    0, 0, snd_dummy_capsrc_info, \
    snd_dummy_capsrc_get, snd_dummy_capsrc_put, \
    addr }

static int snd_dummy_capsrc_info(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo)
{
    uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
    uinfo->count = 2;
    uinfo->value.integer.min = 0;
    uinfo->value.integer.max = 1;
    return 0;
}

static int snd_dummy_capsrc_get(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
{
    snd_card_dummy_t *dummy = snd_kcontrol_chip(kcontrol);
    unsigned long flags;
    int addr = kcontrol->private_value;

    spin_lock_irqsave(&dummy->mixer_lock, flags);
    ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
    ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
    spin_unlock_irqrestore(&dummy->mixer_lock, flags);
    return 0;
}

static int snd_dummy_capsrc_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
{
    snd_card_dummy_t *dummy = snd_kcontrol_chip(kcontrol);
    unsigned long flags;
    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_irqsave(&dummy->mixer_lock, flags);
    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_irqrestore(&dummy->mixer_lock, flags);
    return change;
}

#define DUMMY_CONTROLS (sizeof(snd_dummy_controls)/sizeof(snd_kcontrol_new_t))

static snd_kcontrol_new_t 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_MASTER),
    DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
    DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_MASTER),
    DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
    DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MASTER),
    DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
    DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_MASTER)
};

int __init snd_card_dummy_new_mixer(snd_card_dummy_t * dummy)
{
    snd_card_t *card = dummy->card;
    unsigned int idx;
    int err;

    snd_assert(dummy != NULL, return -EINVAL);
    spin_lock_init(&dummy->mixer_lock);
    strcpy(card->mixername, "Dummy Mixer");

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

static int __init snd_card_dummy_probe(int dev)
{
    snd_card_t *card;
    struct snd_card_dummy *dummy;
    int idx, err;

    if (!enable[dev])
        return -ENODEV;
    card = snd_card_new(index[dev], id[dev], THIS_MODULE,
                        sizeof(struct snd_card_dummy));
    if (card == NULL)
        return -ENOMEM;
    dummy = (struct snd_card_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;
        if ((err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev])) < 0)
            goto __nodev;
    }
    if ((err = snd_card_dummy_new_mixer(dummy)) < 0)
        goto __nodev;
    strcpy(card->driver, "Dummy");
    strcpy(card->shortname, "Dummy");
    sprintf(card->longname, "Dummy %i", dev + 1);
    if ((err = snd_card_register(card)) == 0) {
        snd_dummy_cards[dev] = card;
        return 0;
    }
__nodev:
    snd_card_free(card);
    return err;
}

static int __init alsa_card_dummy_init(void)
{
    int dev, cards;

    for (dev = cards = 0; dev < SNDRV_CARDS && enable[dev]; dev++) {
        if (snd_card_dummy_probe(dev) < 0) {
#ifdef MODULE
            snd_printk("Dummy soundcard #%i not found or device busy\n", dev + 1);
#endif
            break;
        }
        cards++;
    }
    if (!cards) {
#ifdef MODULE
        snd_printk("Dummy soundcard not found or device busy\n");
#endif
        return -ENODEV;
    }
    return 0;
}

static void __exit alsa_card_dummy_exit(void)
{
    int idx;

    for (idx = 0; idx < SNDRV_CARDS; idx++)
        snd_card_free(snd_dummy_cards[idx]);
}

module_init(alsa_card_dummy_init)
module_exit(alsa_card_dummy_exit)

#ifndef MODULE

/* format is: snd-card-dummy=snd_enable,snd_index,snd_id,
 snd_pcm_devs,snd_pcm_substreams */

static int __init alsa_card_dummy_setup(char *str)
{
    static unsigned __initdata nr_dev = 0;

    if (nr_dev >= SNDRV_CARDS)
        return 0;
    (void)(get_option(&str,&enable[nr_dev]) == 2 &&
           get_option(&str,&index[nr_dev]) == 2 &&
           get_id(&str,&id[nr_dev]) == 2 &&
           get_option(&str,&pcm_devs[nr_dev]) == 2 &&
           get_option(&str,&pcm_substreams[nr_dev]) == 2);
    nr_dev++;
    return 1;
}

__setup("snd-dummy=", alsa_card_dummy_setup);

#endif /* ifndef MODULE */
