[linux.git] / sound / drivers / dummy.c

/*
 *  Dummy soundcard
 *  Copyright (c) by Jaroslav Kysela <[email protected]>
 *
 *   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 <sound/driver.h>
#include <linux/init.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/pcm.h>
#include <sound/rawmidi.h>
#include <sound/initval.h>

MODULE_AUTHOR("Jaroslav Kysela <[email protected]>");
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(snd_pcm_runtime_t *runtime)
{
	int err;
	if ((err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
		return err;
	if ((err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX)) < 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


/* 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
#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.");

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

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

static int snd_card_dummy_pcm_trigger(snd_pcm_substream_t *substream, int cmd)
{
	snd_pcm_runtime_t *runtime = substream->runtime;
	snd_dummy_card_pcm_t *dpcm = runtime->private_data;
	int err = 0;

	spin_lock(&dpcm->lock);
	if (cmd == SNDRV_PCM_TRIGGER_START) {
		snd_card_dummy_pcm_timer_start(dpcm);
	} else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
		snd_card_dummy_pcm_timer_stop(dpcm);
	} else {
		err = -EINVAL;
	}
	spin_unlock(&dpcm->lock);
	return err;
}

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 void snd_card_dummy_pcm_timer_function(unsigned long data)
{
	snd_card_dummy_pcm_t *dpcm = (snd_card_dummy_pcm_t *)data;
	
	spin_lock(&dpcm->lock);
	dpcm->timer.expires = 1 + jiffies;
	add_timer(&dpcm->timer);
	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;
		spin_unlock(&dpcm->lock);
		snd_pcm_period_elapsed(dpcm->substream);
		spin_lock(&dpcm->lock);
	}
	spin_unlock(&dpcm->lock);
}

static snd_pcm_uframes_t snd_card_dummy_pcm_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)
{
	kfree(runtime->private_data);
}

static int snd_card_dummy_hw_params(snd_pcm_substream_t * substream,
				    snd_pcm_hw_params_t * hw_params)
{
	return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
}

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

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

	if ((dpcm = new_pcm_stream(substream)) == NULL)
		return -ENOMEM;
	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);
	if ((err = add_playback_constraints(runtime)) < 0) {
		kfree(dpcm);
		return err;
	}

	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;
	int err;

	if ((dpcm = new_pcm_stream(substream)) == NULL)
		return -ENOMEM;
	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);
	if ((err = add_capture_constraints(runtime)) < 0) {
		kfree(dpcm);
		return err;
	}

	return 0;
}

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

static int snd_card_dummy_capture_close(snd_pcm_substream_t * substream)
{
	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_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 snd_pcm_ops_t 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 __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");
	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, .name = xname, .index = xindex, \
  .info = snd_dummy_volume_info, \
  .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
  .private_value = 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);
	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(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
{
	snd_card_dummy_t *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;
}

#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 }

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);
	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(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
{
	snd_card_dummy_t *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 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)
};

static 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 < ARRAY_SIZE(snd_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_set_generic_dev(card)) < 0)
		goto __nodev;

	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
			printk(KERN_ERR "Dummy soundcard #%i not found or device busy\n", dev + 1);
#endif
			break;
		}
		cards++;
	}
	if (!cards) {
#ifdef MODULE
		printk(KERN_ERR "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)
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Dummy soundcard
	3	* Copyright (c) by Jaroslav Kysela <[email protected]>
	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 <[email protected]>");
	35	MODULE_DESCRIPTION("Dummy soundcard (/dev/null)");
	36	MODULE_LICENSE("GPL");
	37	MODULE_SUPPORTED_DEVICE("{{ALSA,Dummy soundcard}}");
	38
	39	#define MAX_PCM_DEVICES 4
	40	#define MAX_PCM_SUBSTREAMS 16
	41	#define MAX_MIDI_DEVICES 2
	42
	43	#if 0 /* emu10k1 emulation */
	44	#define MAX_BUFFER_SIZE (128 * 1024)
	45	static int emu10k1_playback_constraints(snd_pcm_runtime_t *runtime)
	46	{
	47	int err;
	48	if ((err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
	49	return err;
	50	if ((err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX)) < 0)
	51	return err;
	52	return 0;
	53	}
	54	#define add_playback_constraints emu10k1_playback_constraints
	55	#endif
	56
	57	#if 0 /* RME9652 emulation */
	58	#define MAX_BUFFER_SIZE (26 * 64 * 1024)
	59	#define USE_FORMATS SNDRV_PCM_FMTBIT_S32_LE
	60	#define USE_CHANNELS_MIN 26
	61	#define USE_CHANNELS_MAX 26
	62	#define USE_PERIODS_MIN 2
	63	#define USE_PERIODS_MAX 2
	64	#endif
65
66	#if 0 /* ICE1712 emulation */
67	#define MAX_BUFFER_SIZE (256 * 1024)
68	#define USE_FORMATS SNDRV_PCM_FMTBIT_S32_LE
69	#define USE_CHANNELS_MIN 10
70	#define USE_CHANNELS_MAX 10
71	#define USE_PERIODS_MIN 1
72	#define USE_PERIODS_MAX 1024
73	#endif
74
75	#if 0 /* UDA1341 emulation */
76	#define MAX_BUFFER_SIZE (16380)
77	#define USE_FORMATS SNDRV_PCM_FMTBIT_S16_LE
78	#define USE_CHANNELS_MIN 2
79	#define USE_CHANNELS_MAX 2
80	#define USE_PERIODS_MIN 2
81	#define USE_PERIODS_MAX 255
82	#endif
83
84	#if 0 /* simple AC97 bridge (intel8x0) with 48kHz AC97 only codec */
85	#define USE_FORMATS SNDRV_PCM_FMTBIT_S16_LE
86	#define USE_CHANNELS_MIN 2
87	#define USE_CHANNELS_MAX 2
88	#define USE_RATE SNDRV_PCM_RATE_48000
89	#define USE_RATE_MIN 48000
90	#define USE_RATE_MAX 48000
91	#endif
92
93
94	/* defaults */
95	#ifndef MAX_BUFFER_SIZE
96	#define MAX_BUFFER_SIZE (64*1024)
97	#endif
98	#ifndef USE_FORMATS
99	#define USE_FORMATS (SNDRV_PCM_FMTBIT_U8 \| SNDRV_PCM_FMTBIT_S16_LE)
100	#endif
101	#ifndef USE_RATE
102	#define USE_RATE SNDRV_PCM_RATE_CONTINUOUS \| SNDRV_PCM_RATE_8000_48000
103	#define USE_RATE_MIN 5500
104	#define USE_RATE_MAX 48000
105	#endif
106	#ifndef USE_CHANNELS_MIN
107	#define USE_CHANNELS_MIN 1
108	#endif
109	#ifndef USE_CHANNELS_MAX
110	#define USE_CHANNELS_MAX 2
111	#endif
112	#ifndef USE_PERIODS_MIN
113	#define USE_PERIODS_MIN 1
114	#endif
115	#ifndef USE_PERIODS_MAX
116	#define USE_PERIODS_MAX 1024
117	#endif
118	#ifndef add_playback_constraints
119	#define add_playback_constraints(x) 0
120	#endif
121	#ifndef add_capture_constraints
122	#define add_capture_constraints(x) 0
123	#endif
124
125	static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
126	static char id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; / ID for this card */
127	static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
128	static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
129	static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
130	//static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
131
132	module_param_array(index, int, NULL, 0444);
133	MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
134	module_param_array(id, charp, NULL, 0444);
135	MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
136	module_param_array(enable, bool, NULL, 0444);
137	MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
138	module_param_array(pcm_devs, int, NULL, 0444);
139	MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
140	module_param_array(pcm_substreams, int, NULL, 0444);
141	MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-16) for dummy driver.");
142	//module_param_array(midi_devs, int, NULL, 0444);
143	//MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
144
145	#define MIXER_ADDR_MASTER 0
146	#define MIXER_ADDR_LINE 1
147	#define MIXER_ADDR_MIC 2
148	#define MIXER_ADDR_SYNTH 3
149	#define MIXER_ADDR_CD 4
150	#define MIXER_ADDR_LAST 4
151
152	typedef struct snd_card_dummy {
153	snd_card_t *card;
154	spinlock_t mixer_lock;
155	int mixer_volume[MIXER_ADDR_LAST+1][2];
156	int capture_source[MIXER_ADDR_LAST+1][2];
157	} snd_card_dummy_t;
158
159	typedef struct snd_card_dummy_pcm {
160	snd_card_dummy_t *dummy;
161	spinlock_t lock;
162	struct timer_list timer;
163	unsigned int pcm_size;
164	unsigned int pcm_count;
165	unsigned int pcm_bps; /* bytes per second */
166	unsigned int pcm_jiffie; /* bytes per one jiffie */
167	unsigned int pcm_irq_pos; /* IRQ position */
168	unsigned int pcm_buf_pos; /* position in buffer */
169	snd_pcm_substream_t *substream;
170	} snd_card_dummy_pcm_t;
171
172	static snd_card_t *snd_dummy_cards[SNDRV_CARDS] = SNDRV_DEFAULT_PTR;
173
174
c8eb6ba1	175	static inline void snd_card_dummy_pcm_timer_start(snd_card_dummy_pcm_t *dpcm)
1da177e4	176	{
1da177e4 LT	177	dpcm->timer.expires = 1 + jiffies;
	178	add_timer(&dpcm->timer);
	179	}
	180
c8eb6ba1	181	static inline void snd_card_dummy_pcm_timer_stop(snd_card_dummy_pcm_t *dpcm)
1da177e4	182	{
1da177e4 LT	183	del_timer(&dpcm->timer);
	184	}
	185
c8eb6ba1	186	static int snd_card_dummy_pcm_trigger(snd_pcm_substream_t *substream, int cmd)
1da177e4	187	{
c8eb6ba1 TI	188	snd_pcm_runtime_t *runtime = substream->runtime;
	189	snd_dummy_card_pcm_t *dpcm = runtime->private_data;
	190	int err = 0;
1da177e4	191
c8eb6ba1	192	spin_lock(&dpcm->lock);
1da177e4	193	if (cmd == SNDRV_PCM_TRIGGER_START) {
c8eb6ba1	194	snd_card_dummy_pcm_timer_start(dpcm);
1da177e4	195	} else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
c8eb6ba1	196	snd_card_dummy_pcm_timer_stop(dpcm);
1da177e4	197	} else {
c8eb6ba1	198	err = -EINVAL;
1da177e4	199	}
c8eb6ba1 TI	200	spin_unlock(&dpcm->lock);
c8eb6ba1 TI	201	return err;
1da177e4 LT	202	}
	203
	204	static int snd_card_dummy_pcm_prepare(snd_pcm_substream_t * substream)
	205	{
	206	snd_pcm_runtime_t *runtime = substream->runtime;
	207	snd_card_dummy_pcm_t *dpcm = runtime->private_data;
	208	unsigned int bps;
	209
	210	bps = runtime->rate * runtime->channels;
	211	bps *= snd_pcm_format_width(runtime->format);
	212	bps /= 8;
	213	if (bps <= 0)
	214	return -EINVAL;
	215	dpcm->pcm_bps = bps;
	216	dpcm->pcm_jiffie = bps / HZ;
	217	dpcm->pcm_size = snd_pcm_lib_buffer_bytes(substream);
	218	dpcm->pcm_count = snd_pcm_lib_period_bytes(substream);
	219	dpcm->pcm_irq_pos = 0;
	220	dpcm->pcm_buf_pos = 0;
	221	return 0;
	222	}
	223
1da177e4 LT	224	static void snd_card_dummy_pcm_timer_function(unsigned long data)
	225	{
	226	snd_card_dummy_pcm_t dpcm = (snd_card_dummy_pcm_t )data;
	227
c8eb6ba1	228	spin_lock(&dpcm->lock);
1da177e4 LT	229	dpcm->timer.expires = 1 + jiffies;
1da177e4 LT	230	add_timer(&dpcm->timer);
1da177e4 LT	231	dpcm->pcm_irq_pos += dpcm->pcm_jiffie;
	232	dpcm->pcm_buf_pos += dpcm->pcm_jiffie;
	233	dpcm->pcm_buf_pos %= dpcm->pcm_size;
	234	if (dpcm->pcm_irq_pos >= dpcm->pcm_count) {
	235	dpcm->pcm_irq_pos %= dpcm->pcm_count;
c8eb6ba1	236	spin_unlock(&dpcm->lock);
1da177e4	237	snd_pcm_period_elapsed(dpcm->substream);
c8eb6ba1	238	spin_lock(&dpcm->lock);
1da177e4	239	}
c8eb6ba1	240	spin_unlock(&dpcm->lock);
1da177e4 LT	241	}
1da177e4 LT	242
c8eb6ba1	243	static snd_pcm_uframes_t snd_card_dummy_pcm_pointer(snd_pcm_substream_t * substream)
1da177e4 LT	244	{
	245	snd_pcm_runtime_t *runtime = substream->runtime;
	246	snd_card_dummy_pcm_t *dpcm = runtime->private_data;
	247
	248	return bytes_to_frames(runtime, dpcm->pcm_buf_pos);
	249	}
	250
	251	static snd_pcm_hardware_t snd_card_dummy_playback =
	252	{
	253	.info = (SNDRV_PCM_INFO_MMAP \| SNDRV_PCM_INFO_INTERLEAVED \|
	254	SNDRV_PCM_INFO_MMAP_VALID),
	255	.formats = USE_FORMATS,
	256	.rates = USE_RATE,
	257	.rate_min = USE_RATE_MIN,
	258	.rate_max = USE_RATE_MAX,
	259	.channels_min = USE_CHANNELS_MIN,
	260	.channels_max = USE_CHANNELS_MAX,
	261	.buffer_bytes_max = MAX_BUFFER_SIZE,
	262	.period_bytes_min = 64,
	263	.period_bytes_max = MAX_BUFFER_SIZE,
	264	.periods_min = USE_PERIODS_MIN,
	265	.periods_max = USE_PERIODS_MAX,
	266	.fifo_size = 0,
	267	};
	268
	269	static snd_pcm_hardware_t snd_card_dummy_capture =
	270	{
	271	.info = (SNDRV_PCM_INFO_MMAP \| SNDRV_PCM_INFO_INTERLEAVED \|
	272	SNDRV_PCM_INFO_MMAP_VALID),
	273	.formats = USE_FORMATS,
	274	.rates = USE_RATE,
	275	.rate_min = USE_RATE_MIN,
	276	.rate_max = USE_RATE_MAX,
	277	.channels_min = USE_CHANNELS_MIN,
	278	.channels_max = USE_CHANNELS_MAX,
	279	.buffer_bytes_max = MAX_BUFFER_SIZE,
	280	.period_bytes_min = 64,
	281	.period_bytes_max = MAX_BUFFER_SIZE,
	282	.periods_min = USE_PERIODS_MIN,
	283	.periods_max = USE_PERIODS_MAX,
	284	.fifo_size = 0,
	285	};
	286
	287	static void snd_card_dummy_runtime_free(snd_pcm_runtime_t *runtime)
	288	{
c8eb6ba1	289	kfree(runtime->private_data);
1da177e4 LT	290	}
	291
	292	static int snd_card_dummy_hw_params(snd_pcm_substream_t * substream,
	293	snd_pcm_hw_params_t * hw_params)
	294	{
	295	return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
	296	}
	297
	298	static int snd_card_dummy_hw_free(snd_pcm_substream_t * substream)
	299	{
	300	return snd_pcm_lib_free_pages(substream);
	301	}
	302
c8eb6ba1	303	static snd_card_dummy_pcm_t new_pcm_stream(snd_pcm_substream_t substream)
1da177e4	304	{
1da177e4	305	snd_card_dummy_pcm_t *dpcm;
1da177e4	306
561b220a	307	dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
c8eb6ba1 TI	308	if (! dpcm)
c8eb6ba1 TI	309	return dpcm;
1da177e4 LT	310	init_timer(&dpcm->timer);
	311	dpcm->timer.data = (unsigned long) dpcm;
	312	dpcm->timer.function = snd_card_dummy_pcm_timer_function;
	313	spin_lock_init(&dpcm->lock);
	314	dpcm->substream = substream;
c8eb6ba1 TI	315	return dpcm;
	316	}
	317
	318	static int snd_card_dummy_playback_open(snd_pcm_substream_t * substream)
	319	{
	320	snd_pcm_runtime_t *runtime = substream->runtime;
	321	snd_card_dummy_pcm_t *dpcm;
	322	int err;
	323
	324	if ((dpcm = new_pcm_stream(substream)) == NULL)
	325	return -ENOMEM;
1da177e4 LT	326	runtime->private_data = dpcm;
	327	runtime->private_free = snd_card_dummy_runtime_free;
	328	runtime->hw = snd_card_dummy_playback;
	329	if (substream->pcm->device & 1) {
	330	runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
	331	runtime->hw.info \|= SNDRV_PCM_INFO_NONINTERLEAVED;
	332	}
	333	if (substream->pcm->device & 2)
	334	runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP\|SNDRV_PCM_INFO_MMAP_VALID);
	335	if ((err = add_playback_constraints(runtime)) < 0) {
	336	kfree(dpcm);
	337	return err;
	338	}
	339
	340	return 0;
	341	}
	342
	343	static int snd_card_dummy_capture_open(snd_pcm_substream_t * substream)
	344	{
	345	snd_pcm_runtime_t *runtime = substream->runtime;
	346	snd_card_dummy_pcm_t *dpcm;
	347	int err;
	348
c8eb6ba1	349	if ((dpcm = new_pcm_stream(substream)) == NULL)
1da177e4	350	return -ENOMEM;
1da177e4 LT	351	runtime->private_data = dpcm;
	352	runtime->private_free = snd_card_dummy_runtime_free;
	353	runtime->hw = snd_card_dummy_capture;
	354	if (substream->pcm->device == 1) {
	355	runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
	356	runtime->hw.info \|= SNDRV_PCM_INFO_NONINTERLEAVED;
	357	}
	358	if (substream->pcm->device & 2)
	359	runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP\|SNDRV_PCM_INFO_MMAP_VALID);
	360	if ((err = add_capture_constraints(runtime)) < 0) {
	361	kfree(dpcm);
	362	return err;
	363	}
	364
	365	return 0;
	366	}
	367
	368	static int snd_card_dummy_playback_close(snd_pcm_substream_t * substream)
	369	{
	370	return 0;
	371	}
	372
	373	static int snd_card_dummy_capture_close(snd_pcm_substream_t * substream)
	374	{
	375	return 0;
	376	}
	377
	378	static snd_pcm_ops_t snd_card_dummy_playback_ops = {
	379	.open = snd_card_dummy_playback_open,
	380	.close = snd_card_dummy_playback_close,
	381	.ioctl = snd_pcm_lib_ioctl,
	382	.hw_params = snd_card_dummy_hw_params,
	383	.hw_free = snd_card_dummy_hw_free,
c8eb6ba1 TI	384	.prepare = snd_card_dummy_pcm_prepare,
	385	.trigger = snd_card_dummy_pcm_trigger,
	386	.pointer = snd_card_dummy_pcm_pointer,
1da177e4 LT	387	};
	388
	389	static snd_pcm_ops_t snd_card_dummy_capture_ops = {
	390	.open = snd_card_dummy_capture_open,
	391	.close = snd_card_dummy_capture_close,
	392	.ioctl = snd_pcm_lib_ioctl,
	393	.hw_params = snd_card_dummy_hw_params,
	394	.hw_free = snd_card_dummy_hw_free,
c8eb6ba1 TI	395	.prepare = snd_card_dummy_pcm_prepare,
	396	.trigger = snd_card_dummy_pcm_trigger,
	397	.pointer = snd_card_dummy_pcm_pointer,
1da177e4 LT	398	};
	399
	400	static int __init snd_card_dummy_pcm(snd_card_dummy_t *dummy, int device, int substreams)
	401	{
	402	snd_pcm_t *pcm;
	403	int err;
	404
	405	if ((err = snd_pcm_new(dummy->card, "Dummy PCM", device, substreams, substreams, &pcm)) < 0)
	406	return err;
	407	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_card_dummy_playback_ops);
	408	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_dummy_capture_ops);
	409	pcm->private_data = dummy;
	410	pcm->info_flags = 0;
	411	strcpy(pcm->name, "Dummy PCM");
	412	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
	413	snd_dma_continuous_data(GFP_KERNEL),
	414	0, 64*1024);
	415	return 0;
	416	}
	417
	418	#define DUMMY_VOLUME(xname, xindex, addr) \
	419	{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
	420	.info = snd_dummy_volume_info, \
	421	.get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
	422	.private_value = addr }
	423
	424	static int snd_dummy_volume_info(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo)
	425	{
	426	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	427	uinfo->count = 2;
	428	uinfo->value.integer.min = -50;
	429	uinfo->value.integer.max = 100;
	430	return 0;
	431	}
	432
	433	static int snd_dummy_volume_get(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
	434	{
	435	snd_card_dummy_t *dummy = snd_kcontrol_chip(kcontrol);
1da177e4 LT	436	int addr = kcontrol->private_value;
1da177e4 LT	437
c8eb6ba1	438	spin_lock_irq(&dummy->mixer_lock);
1da177e4 LT	439	ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
1da177e4 LT	440	ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
c8eb6ba1	441	spin_unlock_irq(&dummy->mixer_lock);
1da177e4 LT	442	return 0;
	443	}
	444
	445	static int snd_dummy_volume_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
	446	{
	447	snd_card_dummy_t *dummy = snd_kcontrol_chip(kcontrol);
1da177e4 LT	448	int change, addr = kcontrol->private_value;
	449	int left, right;
	450
	451	left = ucontrol->value.integer.value[0];
	452	if (left < -50)
	453	left = -50;
	454	if (left > 100)
	455	left = 100;
	456	right = ucontrol->value.integer.value[1];
	457	if (right < -50)
	458	right = -50;
	459	if (right > 100)
	460	right = 100;
c8eb6ba1	461	spin_lock_irq(&dummy->mixer_lock);
1da177e4 LT	462	change = dummy->mixer_volume[addr][0] != left \|\|
	463	dummy->mixer_volume[addr][1] != right;
	464	dummy->mixer_volume[addr][0] = left;
	465	dummy->mixer_volume[addr][1] = right;
c8eb6ba1	466	spin_unlock_irq(&dummy->mixer_lock);
1da177e4 LT	467	return change;
	468	}
	469
	470	#define DUMMY_CAPSRC(xname, xindex, addr) \
	471	{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
	472	.info = snd_dummy_capsrc_info, \
	473	.get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
	474	.private_value = addr }
	475
	476	static int snd_dummy_capsrc_info(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo)
	477	{
	478	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
	479	uinfo->count = 2;
	480	uinfo->value.integer.min = 0;
	481	uinfo->value.integer.max = 1;
	482	return 0;
	483	}
	484
	485	static int snd_dummy_capsrc_get(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
	486	{
	487	snd_card_dummy_t *dummy = snd_kcontrol_chip(kcontrol);
1da177e4 LT	488	int addr = kcontrol->private_value;
1da177e4 LT	489
c8eb6ba1	490	spin_lock_irq(&dummy->mixer_lock);
1da177e4 LT	491	ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
1da177e4 LT	492	ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
c8eb6ba1	493	spin_unlock_irq(&dummy->mixer_lock);
1da177e4 LT	494	return 0;
	495	}
	496
	497	static int snd_dummy_capsrc_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
	498	{
	499	snd_card_dummy_t *dummy = snd_kcontrol_chip(kcontrol);
1da177e4 LT	500	int change, addr = kcontrol->private_value;
	501	int left, right;
	502
	503	left = ucontrol->value.integer.value[0] & 1;
	504	right = ucontrol->value.integer.value[1] & 1;
c8eb6ba1	505	spin_lock_irq(&dummy->mixer_lock);
1da177e4 LT	506	change = dummy->capture_source[addr][0] != left &&
	507	dummy->capture_source[addr][1] != right;
	508	dummy->capture_source[addr][0] = left;
	509	dummy->capture_source[addr][1] = right;
c8eb6ba1	510	spin_unlock_irq(&dummy->mixer_lock);
1da177e4 LT	511	return change;
	512	}
	513
	514	static snd_kcontrol_new_t snd_dummy_controls[] = {
	515	DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
	516	DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
	517	DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
	518	DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_MASTER),
	519	DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
	520	DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_MASTER),
	521	DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
	522	DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MASTER),
	523	DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
	524	DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_MASTER)
	525	};
	526
	527	static int __init snd_card_dummy_new_mixer(snd_card_dummy_t * dummy)
	528	{
	529	snd_card_t *card = dummy->card;
	530	unsigned int idx;
	531	int err;
	532
	533	snd_assert(dummy != NULL, return -EINVAL);
	534	spin_lock_init(&dummy->mixer_lock);
	535	strcpy(card->mixername, "Dummy Mixer");
	536
	537	for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
	538	if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy))) < 0)
	539	return err;
	540	}
	541	return 0;
	542	}
	543
	544	static int __init snd_card_dummy_probe(int dev)
	545	{
	546	snd_card_t *card;
	547	struct snd_card_dummy *dummy;
	548	int idx, err;
	549
	550	if (!enable[dev])
	551	return -ENODEV;
	552	card = snd_card_new(index[dev], id[dev], THIS_MODULE,
	553	sizeof(struct snd_card_dummy));
	554	if (card == NULL)
	555	return -ENOMEM;
	556	dummy = (struct snd_card_dummy *)card->private_data;
	557	dummy->card = card;
	558	for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
	559	if (pcm_substreams[dev] < 1)
	560	pcm_substreams[dev] = 1;
	561	if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
	562	pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
	563	if ((err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev])) < 0)
	564	goto __nodev;
	565	}
	566	if ((err = snd_card_dummy_new_mixer(dummy)) < 0)
	567	goto __nodev;
	568	strcpy(card->driver, "Dummy");
	569	strcpy(card->shortname, "Dummy");
	570	sprintf(card->longname, "Dummy %i", dev + 1);
16dab54b TI	571
	572	if ((err = snd_card_set_generic_dev(card)) < 0)
	573	goto __nodev;
	574
1da177e4 LT	575	if ((err = snd_card_register(card)) == 0) {
	576	snd_dummy_cards[dev] = card;
	577	return 0;
	578	}
	579	__nodev:
	580	snd_card_free(card);
	581	return err;
	582	}
	583
	584	static int __init alsa_card_dummy_init(void)
	585	{
	586	int dev, cards;
	587
	588	for (dev = cards = 0; dev < SNDRV_CARDS && enable[dev]; dev++) {
	589	if (snd_card_dummy_probe(dev) < 0) {
	590	#ifdef MODULE
	591	printk(KERN_ERR "Dummy soundcard #%i not found or device busy\n", dev + 1);
	592	#endif
	593	break;
	594	}
	595	cards++;
	596	}
	597	if (!cards) {
	598	#ifdef MODULE
	599	printk(KERN_ERR "Dummy soundcard not found or device busy\n");
	600	#endif
	601	return -ENODEV;
	602	}
	603	return 0;
	604	}
	605
	606	static void __exit alsa_card_dummy_exit(void)
	607	{
	608	int idx;
	609
	610	for (idx = 0; idx < SNDRV_CARDS; idx++)
	611	snd_card_free(snd_dummy_cards[idx]);
	612	}
	613
	614	module_init(alsa_card_dummy_init)
	615	module_exit(alsa_card_dummy_exit)