ASoC: rt1320-sdw: kcontrol for brown-out feature update

Create a kcontrol to enable or disable brown-out dynamically.

Signed-off-by: Jack Yu <jack.yu@realtek.com>
Link: https://patch.msgid.link/20260409060102.4177554-1-jack.yu@realtek.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: Jack Yu

sound/soc/codecs/rt1320-sdw.c

@@ -2486,6 +2486,45 @@ static int rt1320_rae_update_put(struct snd_kcontrol *kcontrol,
 	return 0;
 }
 
+static int rt1320_brown_out_put(struct snd_kcontrol *kcontrol,
+				 struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
+	struct rt1320_sdw_priv *rt1320 = snd_soc_component_get_drvdata(component);
+	int ret, changed = 0;
+
+	if (!rt1320->hw_init)
+		return 0;
+
+	ret = pm_runtime_resume(component->dev);
+	if (ret < 0 && ret != -EACCES)
+		return ret;
+
+	if (rt1320->brown_out != ucontrol->value.integer.value[0]) {
+		changed = 1;
+		rt1320->brown_out = ucontrol->value.integer.value[0];
+	}
+
+	if (rt1320->brown_out == 0)
+		regmap_write(rt1320->regmap, 0xdb03, 0x00);
+	else
+		regmap_write(rt1320->regmap, 0xdb03, 0xf0);
+
+
+	return changed;
+}
+
+static int rt1320_brown_out_get(struct snd_kcontrol *kcontrol,
+				     struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
+	struct rt1320_sdw_priv *rt1320 = snd_soc_component_get_drvdata(component);
+
+	ucontrol->value.integer.value[0] = rt1320->brown_out;
+
+	return 0;
+}
+
 static int rt1320_r0_temperature_get(struct snd_kcontrol *kcontrol,
 				     struct snd_ctl_elem_value *ucontrol)
 {
@@ -2545,6 +2584,8 @@ static const struct snd_kcontrol_new rt1320_snd_controls[] = {
 		rt1320_r0_temperature_get, rt1320_r0_temperature_put),
 	SOC_SINGLE_EXT("RAE Update", SND_SOC_NOPM, 0, 1, 0,
 		rt1320_rae_update_get, rt1320_rae_update_put),
+	SOC_SINGLE_EXT("Brown Out Switch", SND_SOC_NOPM, 0, 1, 0,
+		rt1320_brown_out_get, rt1320_brown_out_put),
 };
 
 static const struct snd_kcontrol_new rt1320_spk_l_dac =
@@ -2904,6 +2945,7 @@ static int rt1320_sdw_init(struct device *dev, struct regmap *regmap,
 	rt1320->fu_dapm_mute = true;
 	rt1320->fu_mixer_mute[0] = rt1320->fu_mixer_mute[1] =
 		rt1320->fu_mixer_mute[2] = rt1320->fu_mixer_mute[3] = true;
+	rt1320->brown_out = 1;
 
 	INIT_WORK(&rt1320->load_dspfw_work, rt1320_load_dspfw_work);
 

sound/soc/codecs/rt1320-sdw.h

@@ -159,6 +159,7 @@ struct rt1320_sdw_priv {
 	bool hw_init;
 	bool first_hw_init;
 	int version_id;
+	int brown_out;
 	unsigned int dev_id;
 	bool fu_dapm_mute;
 	bool fu_mixer_mute[4];