ASoC: soc-core: add snd_soc_dapm_init()

It is easy to read code if it is cleanly using paired function/naming,
like start <-> stop, register <-> unregister, etc, etc.
But, current ALSA SoC code is very random, unbalance, not paired, etc.
It is easy to create bug at the such code, and it will be difficult to
debug.

soc-dapm has snd_soc_dapm_free() which cleanups debugfs, widgets, list.
But, there is no paired initialize function.
This patch adds snd_soc_dapm_init() and initilaizing dapm
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87pnkw7lbj.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc-dapm.h

@@ -416,6 +416,9 @@ int snd_soc_dapm_update_dai(struct snd_pcm_substream *substream,
 /* dapm path setup */
 int snd_soc_dapm_new_widgets(struct snd_soc_card *card);
 void snd_soc_dapm_free(struct snd_soc_dapm_context *dapm);
+void snd_soc_dapm_init(struct snd_soc_dapm_context *dapm,
+		       struct snd_soc_card *card,
+		       struct snd_soc_component *component);
 int snd_soc_dapm_add_routes(struct snd_soc_dapm_context *dapm,
 			    const struct snd_soc_dapm_route *route, int num);
 int snd_soc_dapm_del_routes(struct snd_soc_dapm_context *dapm,

sound/soc/soc-core.c

@@ -1023,14 +1023,7 @@ static int soc_probe_component(struct snd_soc_card *card,
 
 	soc_init_component_debugfs(component);
 
-	INIT_LIST_HEAD(&dapm->list);
-	dapm->card		= card;
-	dapm->dev		= component->dev;
-	dapm->component		= component;
-	dapm->bias_level	= SND_SOC_BIAS_OFF;
-	dapm->idle_bias_off	= !component->driver->idle_bias_on;
-	dapm->suspend_bias_off	= component->driver->suspend_bias_off;
-	list_add(&dapm->list, &card->dapm_list);
+	snd_soc_dapm_init(dapm, card, component);
 
 	ret = snd_soc_dapm_new_controls(dapm,
 					component->driver->dapm_widgets,
@@ -1937,10 +1930,7 @@ static int snd_soc_instantiate_card(struct snd_soc_card *card)
 	}
 	mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_INIT);
 
-	card->dapm.bias_level = SND_SOC_BIAS_OFF;
-	card->dapm.dev = card->dev;
-	card->dapm.card = card;
-	list_add(&card->dapm.list, &card->dapm_list);
+	snd_soc_dapm_init(&card->dapm, card, NULL);
 
 	/* check whether any platform is ignore machine FE and using topology */
 	soc_check_tplg_fes(card);

sound/soc/soc-dapm.c

@@ -4717,6 +4717,27 @@ void snd_soc_dapm_free(struct snd_soc_dapm_context *dapm)
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_free);
 
+void snd_soc_dapm_init(struct snd_soc_dapm_context *dapm,
+		       struct snd_soc_card *card,
+		       struct snd_soc_component *component)
+{
+	dapm->card		= card;
+	dapm->component		= component;
+	dapm->bias_level	= SND_SOC_BIAS_OFF;
+
+	if (component) {
+		dapm->dev		= component->dev;
+		dapm->idle_bias_off	= !component->driver->idle_bias_on,
+		dapm->suspend_bias_off	= component->driver->suspend_bias_off;
+	} else {
+		dapm->dev		= card->dev;
+	}
+
+	INIT_LIST_HEAD(&dapm->list);
+	list_add(&dapm->list, &card->dapm_list);
+}
+EXPORT_SYMBOL_GPL(snd_soc_dapm_init);
+
 static void soc_dapm_shutdown_dapm(struct snd_soc_dapm_context *dapm)
 {
 	struct snd_soc_card *card = dapm->card;