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ASoC: Support registering a DAI dynamically 

Define API snd_soc_register_dai() to add a DAI dynamically and
create the DAI widgets. Topology can use this API to register DAIs
when probing a component with topology info. These DAIs's playback
& capture widgets will be freed when the sound card is unregistered
and the DAIs will be freed when cleaning up the component.

And a dobj is embedded into the struct snd_soc_dai_driver. Topology
can use the dobj to find the DAI drivers created by it and free them
when the topology component is removed.

Signed-off-by: Mengdong Lin <mengdong.lin@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Mengdong Lin 2015-12-31 16:40:43 +08:00 committed by Mark Brown
parent 5e4fb37211
commit 68003e6cf2
3 changed files with 46 additions and 0 deletions
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1
include/sound/soc-dai.h
View File

@ -222,6 +222,7 @@ struct snd_soc_dai_driver {
const char *name;
unsigned int id;
unsigned int base;
struct snd_soc_dobj dobj;
/* DAI driver callbacks */
int (*probe)(struct snd_soc_dai *dai);

3
include/sound/soc.h
View File

@ -1663,6 +1663,9 @@ int snd_soc_add_dai_link(struct snd_soc_card *card,
void snd_soc_remove_dai_link(struct snd_soc_card *card,
struct snd_soc_dai_link *dai_link);
int snd_soc_register_dai(struct snd_soc_component *component,
struct snd_soc_dai_driver *dai_drv);
#include <sound/soc-dai.h>
#ifdef CONFIG_DEBUG_FS

42
sound/soc/soc-core.c
View File

@ -2834,6 +2834,48 @@ static int snd_soc_register_dais(struct snd_soc_component *component,
return ret;
}
/**
* snd_soc_register_dai - Register a DAI dynamically & create its widgets
*
* @component: The component the DAIs are registered for
* @dai_drv: DAI driver to use for the DAI
*
* Topology can use this API to register DAIs when probing a component.
* These DAIs's widgets will be freed in the card cleanup and the DAIs
* will be freed in the component cleanup.
*/
int snd_soc_register_dai(struct snd_soc_component *component,
struct snd_soc_dai_driver *dai_drv)
{
struct snd_soc_dapm_context *dapm =
snd_soc_component_get_dapm(component);
struct snd_soc_dai *dai;
int ret;
if (dai_drv->dobj.type != SND_SOC_DOBJ_PCM) {
dev_err(component->dev, "Invalid dai type %d\n",
dai_drv->dobj.type);
return -EINVAL;
}
lockdep_assert_held(&client_mutex);
dai = soc_add_dai(component, dai_drv, false);
if (!dai)
return -ENOMEM;
/* Create the DAI widgets here. After adding DAIs, topology may
* also add routes that need these widgets as source or sink.
*/
ret = snd_soc_dapm_new_dai_widgets(dapm, dai);
if (ret != 0) {
dev_err(component->dev,
"Failed to create DAI widgets %d\n", ret);
}
return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_register_dai);
static void snd_soc_component_seq_notifier(struct snd_soc_dapm_context *dapm,
enum snd_soc_dapm_type type, int subseq)
{