ASoC: dapm: Support second register for DAPM control updates

To support double channel shared controls split across 2 registers, one
for each channel, we must be able to update both registers together.

Add a second set of register fields to struct snd_soc_dapm_update, and
update the DAPM control writeback (put) callbacks to support this.

For codecs that use custom events which call into DAPM to do updates,
also clear struct snd_soc_dapm_update before using it, so the second
set of fields remains clean.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc-dapm.h

@@ -615,6 +615,10 @@ struct snd_soc_dapm_update {
 	int reg;
 	int mask;
 	int val;
+	int reg2;
+	int mask2;
+	int val2;
+	bool has_second_set;
 };
 
 struct snd_soc_dapm_wcache {

sound/soc/codecs/adau17x1.c

@@ -160,7 +160,7 @@ static int adau17x1_dsp_mux_enum_put(struct snd_kcontrol *kcontrol,
 	struct snd_soc_dapm_context *dapm = snd_soc_codec_get_dapm(codec);
 	struct adau *adau = snd_soc_codec_get_drvdata(codec);
 	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
-	struct snd_soc_dapm_update update;
+	struct snd_soc_dapm_update update = { 0 };
 	unsigned int stream = e->shift_l;
 	unsigned int val, change;
 	int reg;

sound/soc/codecs/tlv320aic3x.c

@@ -157,7 +157,7 @@ static int snd_soc_dapm_put_volsw_aic3x(struct snd_kcontrol *kcontrol,
 	unsigned int mask = (1 << fls(max)) - 1;
 	unsigned int invert = mc->invert;
 	unsigned short val;
-	struct snd_soc_dapm_update update;
+	struct snd_soc_dapm_update update = { 0 };
 	int connect, change;
 
 	val = (ucontrol->value.integer.value[0] & mask);

sound/soc/codecs/wm9712.c

@@ -187,7 +187,7 @@ static int wm9712_hp_mixer_put(struct snd_kcontrol *kcontrol,
 	struct soc_mixer_control *mc =
 		(struct soc_mixer_control *)kcontrol->private_value;
 	unsigned int mixer, mask, shift, old;
-	struct snd_soc_dapm_update update;
+	struct snd_soc_dapm_update update = { 0 };
 	bool change;
 
 	mixer = mc->shift >> 8;

sound/soc/codecs/wm9713.c

@@ -231,7 +231,7 @@ static int wm9713_hp_mixer_put(struct snd_kcontrol *kcontrol,
 	struct soc_mixer_control *mc =
 		(struct soc_mixer_control *)kcontrol->private_value;
 	unsigned int mixer, mask, shift, old;
-	struct snd_soc_dapm_update update;
+	struct snd_soc_dapm_update update = { 0 };
 	bool change;
 
 	mixer = mc->shift >> 8;

sound/soc/soc-dapm.c

@@ -1626,6 +1626,15 @@ static void dapm_widget_update(struct snd_soc_card *card)
 		dev_err(w->dapm->dev, "ASoC: %s DAPM update failed: %d\n",
 			w->name, ret);
 
+	if (update->has_second_set) {
+		ret = soc_dapm_update_bits(w->dapm, update->reg2,
+					   update->mask2, update->val2);
+		if (ret < 0)
+			dev_err(w->dapm->dev,
+				"ASoC: %s DAPM update failed: %d\n",
+				w->name, ret);
+	}
+
 	for (wi = 0; wi < wlist->num_widgets; wi++) {
 		w = wlist->widgets[wi];
 
@@ -3084,7 +3093,7 @@ int snd_soc_dapm_put_volsw(struct snd_kcontrol *kcontrol,
 	unsigned int invert = mc->invert;
 	unsigned int val;
 	int connect, change, reg_change = 0;
-	struct snd_soc_dapm_update update;
+	struct snd_soc_dapm_update update = { NULL };
 	int ret = 0;
 
 	if (snd_soc_volsw_is_stereo(mc))
@@ -3192,7 +3201,7 @@ int snd_soc_dapm_put_enum_double(struct snd_kcontrol *kcontrol,
 	unsigned int *item = ucontrol->value.enumerated.item;
 	unsigned int val, change, reg_change = 0;
 	unsigned int mask;
-	struct snd_soc_dapm_update update;
+	struct snd_soc_dapm_update update = { NULL };
 	int ret = 0;
 
 	if (item[0] >= e->items)