1 files changed, 715 insertions, 0 deletions

diff --git a/sound/drivers/dummy.c b/sound/drivers/dummy.c
new file mode 100644
index 0000000..73be7e1
--- /dev/null
+++ b/sound/drivers/dummy.c
@@ -0,0 +1,715 @@
+/*
+ *  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;
+
+	card = snd_card_new(index[dev], id[dev], THIS_MODULE,
+			    sizeof(struct snd_dummy));
+	if (card == NULL)
+		return -ENOMEM;
+	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)