OrgACRN
/
acrn-kernel
mirror of https://github.com/projectacrn/acrn-kernel.git
1
0
Fork 0
Code Issues Releases Wiki Activity
acrn-kernel/sound/drivers/dummy.c

648 lines
19 KiB
C
Raw Blame History

/*
* 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)
Reference in New Issue View Git Blame Copy Permalink