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 <[email protected]> Signed-off-by: Mark Brown <[email protected]>
kyagi · Jan 10, 2016 · 68003e6 · 68003e6
1 parent 5e4fb37
commit 68003e6
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diff --git a/include/sound/soc-dai.h b/include/sound/soc-dai.h
@@ -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);

diff --git a/include/sound/soc.h b/include/sound/soc.h
@@ -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

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
@@ -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)
 {