ASoC: Add optional name_prefix for codec kcontrol, widget and route names

There is a need to prefix codec kcontrol, widget and internal route names in
an ASoC machine that has multiple codecs with conflicting names. The name
collision would occur when codec drivers try to registering kcontrols with
the same name or when building audio paths.

This patch introduces optional prefix_map into struct snd_soc_card. With it
machine drivers can specify a unique name prefix to each codec that have
conflicting names with anothers. Prefix to codec is matched with codec
name.

Following example illustrates a machine that has two same codec instances.
Name collision from kcontrol registration is avoided by specifying a name
prefix "foo" for the second codec. As the codec widget names are prefixed
then second audio map for that codec shows a prefixed widget name.

static const struct snd_soc_dapm_route map0[] = {
	{"Spk", NULL, "MONO"},
};

static const struct snd_soc_dapm_route map1[] = {
	{"Vibra", NULL, "foo MONO"},
};

static struct snd_soc_prefix_map codec_prefix[] = {
	{
		.dev_name = "codec.2",
		.name_prefix = "foo",
	},
};

static struct snd_soc_card card = {
	...
	.prefix_map = codec_prefix,
	.num_prefixes = ARRAY_SIZE(codec_prefix),
};

Signed-off-by: Jarkko Nikula <jhnikula@gmail.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/include/sound/soc.h b/include/sound/soc.h
index af23f422886..3eb92ef6c83 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -450,6 +450,7 @@ struct snd_soc_cache_ops {
 /* SoC Audio Codec device */
 struct snd_soc_codec {
         const char *name;
+        const char *name_prefix;
         int id;
         struct device *dev;
         struct snd_soc_codec_driver *driver;
@@ -577,6 +578,11 @@ struct snd_soc_dai_link {
         struct snd_soc_ops *ops;
 };
 
+struct snd_soc_prefix_map {
+        const char *dev_name;
+        const char *name_prefix;
+};
+
 /* SoC card */
 struct snd_soc_card {
         const char *name;
@@ -611,6 +617,13 @@ struct snd_soc_card {
         struct snd_soc_pcm_runtime *rtd;
         int num_rtd;
 
+        /*
+         * optional map of kcontrol, widget and path name prefixes that are
+         * associated per device
+         */
+        struct snd_soc_prefix_map *prefix_map;
+        int num_prefixes;
+
         struct work_struct deferred_resume_work;
 
         /* lists of probed devices belonging to this card */