ASoC: soc-dapm: add snd_soc_dapm_to_card()

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 card 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/87bjnqx06v.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: morimoto

include/sound/soc-dapm.h

@@ -661,6 +661,7 @@ 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);
+struct snd_soc_card *snd_soc_dapm_to_card(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

@@ -174,6 +174,12 @@ struct device *snd_soc_dapm_to_dev(struct snd_soc_dapm_context *dapm)
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_to_dev);
 
+struct snd_soc_card *snd_soc_dapm_to_card(struct snd_soc_dapm_context *dapm)
+{
+	return dapm->card;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dapm_to_card);
+
 static bool dapm_dirty_widget(struct snd_soc_dapm_widget *w)
 {
 	return !list_empty(&w->dirty);