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linux/sound/drivers/dummy.c

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/*
* 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)
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