ASoC: Introduce 'fixup_controls' card method

The new method is called just before the card is registered, providing
an opportune time for machine-level drivers to do some final controls
amending: deactivating individual controls or obtaining control
references for later use.

Some controls can be created by DAPM after 'late_probe' has been called,
hence the need for this new method.
Signed-off-by: Martin Povišer <povik+lin@cutebit.org>
Link: https://lore.kernel.org/r/20220606191910.16580-5-povik+lin@cutebit.orgSigned-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc-card.h

@@ -29,6 +29,7 @@ int snd_soc_card_resume_post(struct snd_soc_card *card);
 
 int snd_soc_card_probe(struct snd_soc_card *card);
 int snd_soc_card_late_probe(struct snd_soc_card *card);
+void snd_soc_card_fixup_controls(struct snd_soc_card *card);
 int snd_soc_card_remove(struct snd_soc_card *card);
 
 int snd_soc_card_set_bias_level(struct snd_soc_card *card,

include/sound/soc.h

@@ -916,6 +916,7 @@ struct snd_soc_card {
 
 	int (*probe)(struct snd_soc_card *card);
 	int (*late_probe)(struct snd_soc_card *card);
+	void (*fixup_controls)(struct snd_soc_card *card);
 	int (*remove)(struct snd_soc_card *card);
 
 	/* the pre and post PM functions are used to do any PM work before and

sound/soc/soc-card.c

@@ -197,6 +197,12 @@ int snd_soc_card_late_probe(struct snd_soc_card *card)
 	return 0;
 }
 
+void snd_soc_card_fixup_controls(struct snd_soc_card *card)
+{
+	if (card->fixup_controls)
+		card->fixup_controls(card);
+}
+
 int snd_soc_card_remove(struct snd_soc_card *card)
 {
 	int ret = 0;

sound/soc/soc-core.c

@@ -2066,6 +2066,7 @@ static int snd_soc_bind_card(struct snd_soc_card *card)
 		goto probe_end;
 
 	snd_soc_dapm_new_widgets(card);
+	snd_soc_card_fixup_controls(card);
 
 	ret = snd_card_register(card->snd_card);
 	if (ret < 0) {