[PATCH v2 15/21] ASoC: codecs: wm8985: Move regulator acquisition to the bus probe

[Chancel Liu <chancel.liu@oss.nxp.com>]

From: Chancel Liu <chancel.liu@nxp.com>

component->dev is the underlying i2c/spi device whose devres is only
released on physical device removal, not on ASoC card unbind.  Getting
the regulator supplies with devm_regulator_bulk_get(component->dev, ...)
in the component probe therefore leaks the regulator references on every
card bind/unbind cycle.

Move the devm_regulator_bulk_get() into a helper called from the i2c and
spi probes so the supplies are tied to the physical device lifetime.

Signed-off-by: Chancel Liu <chancel.liu@nxp.com>
---
 sound/soc/codecs/wm8985.c | 35 +++++++++++++++++++++++++----------
 1 file changed, 25 insertions(+), 10 deletions(-)

diff --git a/sound/soc/codecs/wm8985.c b/sound/soc/codecs/wm8985.c
index 877a691c188b..1e862609f5b3 100644
--- a/sound/soc/codecs/wm8985.c
+++ b/sound/soc/codecs/wm8985.c
@@ -1029,23 +1029,30 @@ static int wm8985_set_bias_level(struct snd_soc_component *component,
 	return 0;
 }
 
-static int wm8985_probe(struct snd_soc_component *component)
+static int wm8985_get_regulators(struct device *dev,
+				 struct wm8985_priv *wm8985)
 {
 	size_t i;
-	struct wm8985_priv *wm8985;
 	int ret;
 
-	wm8985 = snd_soc_component_get_drvdata(component);
-
 	for (i = 0; i < ARRAY_SIZE(wm8985->supplies); i++)
 		wm8985->supplies[i].supply = wm8985_supply_names[i];
 
-	ret = devm_regulator_bulk_get(component->dev, ARRAY_SIZE(wm8985->supplies),
-				 wm8985->supplies);
-	if (ret) {
-		dev_err(component->dev, "Failed to request supplies: %d\n", ret);
-		return ret;
-	}
+	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(wm8985->supplies),
+				      wm8985->supplies);
+	if (ret)
+		dev_err(dev, "Failed to request supplies: %d\n", ret);
+
+	return ret;
+}
+
+static int wm8985_probe(struct snd_soc_component *component)
+{
+	size_t i;
+	struct wm8985_priv *wm8985;
+	int ret;
+
+	wm8985 = snd_soc_component_get_drvdata(component);
 
 	ret = regulator_bulk_enable(ARRAY_SIZE(wm8985->supplies),
 				    wm8985->supplies);
@@ -1176,6 +1183,10 @@ static int wm8985_spi_probe(struct spi_device *spi)
 		return ret;
 	}
 
+	ret = wm8985_get_regulators(&spi->dev, wm8985);
+	if (ret)
+		return ret;
+
 	ret = devm_snd_soc_register_component(&spi->dev,
 				     &soc_component_dev_wm8985, &wm8985_dai, 1);
 	return ret;
@@ -1212,6 +1223,10 @@ static int wm8985_i2c_probe(struct i2c_client *i2c)
 		return ret;
 	}
 
+	ret = wm8985_get_regulators(&i2c->dev, wm8985);
+	if (ret)
+		return ret;
+
 	ret = devm_snd_soc_register_component(&i2c->dev,
 				     &soc_component_dev_wm8985, &wm8985_dai, 1);
 	return ret;
-- 
2.50.1