[PATCH] ASoC: rt5645: Fix the electric noise due to the CBJ contacts floating

[<derek.fang@realtek.com>]

From: Derek Fang <derek.fang@realtek.com>

The codec leaves tie combo jack's sleeve/ring2 to floating status
default. It would cause electric noise while connecting the active
speaker jack during boot or shutdown.
This patch requests a gpio to control the additional jack circuit
to tie the contacts to the ground or floating.

Signed-off-by: Derek Fang <derek.fang@realtek.com>

diff --git a/sound/soc/codecs/rt5645.c b/sound/soc/codecs/rt5645.c
index e3ba04484813..d0d24a53df74 100644
--- a/sound/soc/codecs/rt5645.c
+++ b/sound/soc/codecs/rt5645.c
@@ -444,6 +444,7 @@ struct rt5645_priv {
 	struct regmap *regmap;
 	struct i2c_client *i2c;
 	struct gpio_desc *gpiod_hp_det;
+	struct gpio_desc *gpiod_cbj_sleeve;
 	struct snd_soc_jack *hp_jack;
 	struct snd_soc_jack *mic_jack;
 	struct snd_soc_jack *btn_jack;
@@ -3186,6 +3187,9 @@ static int rt5645_jack_detect(struct snd_soc_component *component, int jack_inse
 		regmap_update_bits(rt5645->regmap, RT5645_IN1_CTRL2,
 			RT5645_CBJ_MN_JD, 0);
 
+		if (rt5645->gpiod_cbj_sleeve)
+			gpiod_set_value(rt5645->gpiod_cbj_sleeve, 1);
+
 		msleep(600);
 		regmap_read(rt5645->regmap, RT5645_IN1_CTRL3, &val);
 		val &= 0x7;
@@ -3202,6 +3206,8 @@ static int rt5645_jack_detect(struct snd_soc_component *component, int jack_inse
 			snd_soc_dapm_disable_pin(dapm, "Mic Det Power");
 			snd_soc_dapm_sync(dapm);
 			rt5645->jack_type = SND_JACK_HEADPHONE;
+			if (rt5645->gpiod_cbj_sleeve)
+				gpiod_set_value(rt5645->gpiod_cbj_sleeve, 0);
 		}
 		if (rt5645->pdata.level_trigger_irq)
 			regmap_update_bits(rt5645->regmap, RT5645_IRQ_CTRL2,
@@ -3229,6 +3235,9 @@ static int rt5645_jack_detect(struct snd_soc_component *component, int jack_inse
 		if (rt5645->pdata.level_trigger_irq)
 			regmap_update_bits(rt5645->regmap, RT5645_IRQ_CTRL2,
 				RT5645_JD_1_1_MASK, RT5645_JD_1_1_INV);
+
+		if (rt5645->gpiod_cbj_sleeve)
+			gpiod_set_value(rt5645->gpiod_cbj_sleeve, 0);
 	}
 
 	return rt5645->jack_type;
@@ -4012,6 +4021,16 @@ static int rt5645_i2c_probe(struct i2c_client *i2c)
 			return ret;
 	}
 
+	rt5645->gpiod_cbj_sleeve = devm_gpiod_get_optional(&i2c->dev, "cbj-sleeve",
+							   GPIOD_OUT_LOW);
+
+	if (IS_ERR(rt5645->gpiod_cbj_sleeve)) {
+		ret = PTR_ERR(rt5645->gpiod_cbj_sleeve);
+		dev_info(&i2c->dev, "failed to initialize gpiod, ret=%d\n", ret);
+		if (ret != -ENOENT)
+			return ret;
+	}
+
 	for (i = 0; i < ARRAY_SIZE(rt5645->supplies); i++)
 		rt5645->supplies[i].supply = rt5645_supply_names[i];
 
@@ -4259,6 +4278,9 @@ static void rt5645_i2c_remove(struct i2c_client *i2c)
 	cancel_delayed_work_sync(&rt5645->jack_detect_work);
 	cancel_delayed_work_sync(&rt5645->rcclock_work);
 
+	if (rt5645->gpiod_cbj_sleeve)
+		gpiod_set_value(rt5645->gpiod_cbj_sleeve, 0);
+
 	regulator_bulk_disable(ARRAY_SIZE(rt5645->supplies), rt5645->supplies);
 }
 
@@ -4274,6 +4296,9 @@ static void rt5645_i2c_shutdown(struct i2c_client *i2c)
 		0);
 	msleep(20);
 	regmap_write(rt5645->regmap, RT5645_RESET, 0);
+
+	if (rt5645->gpiod_cbj_sleeve)
+		gpiod_set_value(rt5645->gpiod_cbj_sleeve, 0);
 }
 
 static int __maybe_unused rt5645_sys_suspend(struct device *dev)
-- 
2.34.1