ASoC: samsung: midas_wm1811: Use SND_SOC_DAPM_REGULATOR_SUPPLY for bias regulators

Instead of using a custom function with the SND_SOC_DAPM_MIC widget,
split out the main mic/sub mic bias regulators into a separate widget
using SND_SOC_DAPM_REGULATOR_SUPPLY, and connect them via a routing.
Signed-off-by: Artur Weber <aweber.kernel@gmail.com>
Link: https://msgid.link/r/20240525-midas-wm1811-gpio-jack-v4-3-f488e03bd8c7@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/samsung/midas_wm1811.c

@@ -10,7 +10,6 @@
 #include <linux/mfd/wm8994/registers.h>
 #include <linux/module.h>
 #include <linux/of.h>
-#include <linux/regulator/consumer.h>
 #include <sound/jack.h>
 #include <sound/soc.h>
 #include <sound/soc-dapm.h>
@@ -27,8 +26,6 @@
 #define DEFAULT_FLL1_RATE 11289600U
 
 struct midas_priv {
-	struct regulator *reg_mic_bias;
-	struct regulator *reg_submic_bias;
 	struct gpio_desc *gpio_fm_sel;
 	struct gpio_desc *gpio_lineout_sel;
 	unsigned int fll1_rate;
@@ -169,38 +166,6 @@ static int midas_ext_spkmode(struct snd_soc_dapm_widget *w,
 	return ret;
 }
 
-static int midas_mic_bias(struct snd_soc_dapm_widget *w,
-			  struct snd_kcontrol *kcontrol, int event)
-{
-	struct snd_soc_card *card = w->dapm->card;
-	struct midas_priv *priv = snd_soc_card_get_drvdata(card);
-
-	switch (event) {
-	case SND_SOC_DAPM_PRE_PMU:
-		return regulator_enable(priv->reg_mic_bias);
-	case SND_SOC_DAPM_POST_PMD:
-		return regulator_disable(priv->reg_mic_bias);
-	}
-
-	return 0;
-}
-
-static int midas_submic_bias(struct snd_soc_dapm_widget *w,
-			     struct snd_kcontrol *kcontrol, int event)
-{
-	struct snd_soc_card *card = w->dapm->card;
-	struct midas_priv *priv = snd_soc_card_get_drvdata(card);
-
-	switch (event) {
-	case SND_SOC_DAPM_PRE_PMU:
-		return regulator_enable(priv->reg_submic_bias);
-	case SND_SOC_DAPM_POST_PMD:
-		return regulator_disable(priv->reg_submic_bias);
-	}
-
-	return 0;
-}
-
 static int midas_fm_set(struct snd_soc_dapm_widget *w,
 			struct snd_kcontrol *kcontrol, int event)
 {
@@ -272,8 +237,17 @@ static const struct snd_soc_dapm_widget midas_dapm_widgets[] = {
 
 	SND_SOC_DAPM_HP("Headphone", NULL),
 	SND_SOC_DAPM_MIC("Headset Mic", NULL),
-	SND_SOC_DAPM_MIC("Main Mic", midas_mic_bias),
-	SND_SOC_DAPM_MIC("Sub Mic", midas_submic_bias),
+	SND_SOC_DAPM_MIC("Main Mic", NULL),
+	SND_SOC_DAPM_REGULATOR_SUPPLY("mic-bias", 0, 0),
+	SND_SOC_DAPM_MIC("Sub Mic", NULL),
+	SND_SOC_DAPM_REGULATOR_SUPPLY("submic-bias", 0, 0),
+};
+
+/* Default routing; supplemented by audio-routing DT property */
+static const struct snd_soc_dapm_route midas_dapm_routes[] = {
+	/* Bind microphones with their respective regulator supplies */
+	{"Main Mic", NULL, "mic-bias"},
+	{"Sub Mic", NULL, "submic-bias"},
 };
 
 static int midas_set_bias_level(struct snd_soc_card *card,
@@ -421,6 +395,8 @@ static struct snd_soc_card midas_card = {
 	.num_controls = ARRAY_SIZE(midas_controls),
 	.dapm_widgets = midas_dapm_widgets,
 	.num_dapm_widgets = ARRAY_SIZE(midas_dapm_widgets),
+	.dapm_routes = midas_dapm_routes,
+	.num_dapm_routes = ARRAY_SIZE(midas_dapm_routes),
 
 	.set_bias_level = midas_set_bias_level,
 	.late_probe = midas_late_probe,
@@ -443,18 +419,6 @@ static int midas_probe(struct platform_device *pdev)
 	snd_soc_card_set_drvdata(card, priv);
 	card->dev = dev;
 
-	priv->reg_mic_bias = devm_regulator_get(dev, "mic-bias");
-	if (IS_ERR(priv->reg_mic_bias)) {
-		dev_err(dev, "Failed to get mic bias regulator\n");
-		return PTR_ERR(priv->reg_mic_bias);
-	}
-
-	priv->reg_submic_bias = devm_regulator_get(dev, "submic-bias");
-	if (IS_ERR(priv->reg_submic_bias)) {
-		dev_err(dev, "Failed to get submic bias regulator\n");
-		return PTR_ERR(priv->reg_submic_bias);
-	}
-
 	priv->gpio_fm_sel = devm_gpiod_get_optional(dev, "fm-sel", GPIOD_OUT_HIGH);
 	if (IS_ERR(priv->gpio_fm_sel)) {
 		dev_err(dev, "Failed to get FM selection GPIO\n");