ASoC: soc-dapm: add snd_soc_dapm_to_dev()

Because struct snd_soc_dapm_context is soc-dapm framework specific, user
driver don't need to access its member directly, we would like to hide
them. struct snd_soc_dapm_context will be removed from header in the
future.

Some drivers need to get dev from dapm (which will be removed).
We need such function. Add it.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://patch.msgid.link/87cy86x06z.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: morimoto

include/sound/soc-dapm.h

@@ -587,7 +587,7 @@ struct snd_soc_dapm_context {
 	unsigned int idle_bias_off:1;		/* Use BIAS_OFF instead of STANDBY */
 	unsigned int suspend_bias_off:1;	/* Use BIAS_OFF in suspend if the DAPM is idle */
 
-	struct device *dev;			/* from parent - for debug */
+	struct device *dev;			/* from parent - for debug */ /* REMOVE ME */
 	struct snd_soc_component *component;	/* parent component */
 	struct snd_soc_card *card;		/* parent card */
 
@@ -660,6 +660,7 @@ void snd_soc_dapm_connect_dai_link_widgets(struct snd_soc_card *card);
 int snd_soc_dapm_update_dai(struct snd_pcm_substream *substream,
 			    struct snd_pcm_hw_params *params, struct snd_soc_dai *dai);
 int snd_soc_dapm_widget_name_cmp(struct snd_soc_dapm_widget *widget, const char *s);
+struct device *snd_soc_dapm_to_dev(struct snd_soc_dapm_context *dapm);
 
 /* dapm path setup */
 int snd_soc_dapm_new_widgets(struct snd_soc_card *card);

sound/soc/soc-dapm.c

@@ -165,6 +165,15 @@ static void pop_dbg(struct device *dev, u32 pop_time, const char *fmt, ...)
 	kfree(buf);
 }
 
+struct device *snd_soc_dapm_to_dev(struct snd_soc_dapm_context *dapm)
+{
+	if (dapm->component)
+		return dapm->component->dev;
+
+	return dapm->card->dev;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dapm_to_dev);
+
 static bool dapm_dirty_widget(struct snd_soc_dapm_widget *w)
 {
 	return !list_empty(&w->dirty);