kernel_optimize_test/sound/drivers/dummy.c
Takashi Iwai 561b220a4d [ALSA] Replace with kzalloc() - others
Documentation,SA11xx UDA1341 driver,Generic drivers,MPU401 UART,OPL3
OPL4,Digigram VX core,I2C cs8427,I2C lib core,I2C tea6330t,L3 drivers
AK4114 receiver,AK4117 receiver,PDAudioCF driver,PPC PMAC driver
SPARC AMD7930 driver,SPARC cs4231 driver,Synth,Common EMU synth
USB generic driver,USB USX2Y
Replace kcalloc(1,..) with kzalloc().

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2005-09-12 10:48:22 +02:00

648 lines
19 KiB
C

/*
* 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., 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 <perex@suse.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(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 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);
}
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 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;
dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
if (dpcm == NULL)
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);
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;
dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
if (dpcm == NULL)
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_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_playback_prepare,
.trigger = snd_card_dummy_playback_trigger,
.pointer = snd_card_dummy_playback_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_capture_prepare,
.trigger = snd_card_dummy_capture_trigger,
.pointer = snd_card_dummy_capture_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);
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) \
{ .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);
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;
}
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)