[PATCH 3/5] iio: adc: ad7292: use devm_regulator_get_enable_read_voltage

[David Lechner]

This makes use of the new devm_regulator_get_enable_read_voltage()
function to reduce boilerplate code.

Signed-off-by: David Lechner <dlechner@xxxxxxxxxxxx>
---
 drivers/iio/adc/ad7292.c | 40 ++++++++++------------------------------
 1 file changed, 10 insertions(+), 30 deletions(-)

diff --git a/drivers/iio/adc/ad7292.c b/drivers/iio/adc/ad7292.c
index 6aadd14f459d..aad4b782a3d2 100644
--- a/drivers/iio/adc/ad7292.c
+++ b/drivers/iio/adc/ad7292.c
@@ -79,7 +79,6 @@ static const struct iio_chan_spec ad7292_channels_diff[] = {
 
 struct ad7292_state {
 	struct spi_device *spi;
-	struct regulator *reg;
 	unsigned short vref_mv;
 
 	__be16 d16 __aligned(IIO_DMA_MINALIGN);
@@ -250,13 +249,6 @@ static const struct iio_info ad7292_info = {
 	.read_raw = ad7292_read_raw,
 };
 
-static void ad7292_regulator_disable(void *data)
-{
-	struct ad7292_state *st = data;
-
-	regulator_disable(st->reg);
-}
-
 static int ad7292_probe(struct spi_device *spi)
 {
 	struct ad7292_state *st;
@@ -277,29 +269,17 @@ static int ad7292_probe(struct spi_device *spi)
 		return -EINVAL;
 	}
 
-	st->reg = devm_regulator_get_optional(&spi->dev, "vref");
-	if (!IS_ERR(st->reg)) {
-		ret = regulator_enable(st->reg);
-		if (ret) {
-			dev_err(&spi->dev,
-				"Failed to enable external vref supply\n");
-			return ret;
-		}
-
-		ret = devm_add_action_or_reset(&spi->dev,
-					       ad7292_regulator_disable, st);
-		if (ret)
-			return ret;
-
-		ret = regulator_get_voltage(st->reg);
-		if (ret < 0)
-			return ret;
-
-		st->vref_mv = ret / 1000;
-	} else {
-		/* Use the internal voltage reference. */
+	/*
+	 * Use external reference from vref if present, otherwise use 1.25V
+	 * internal reference.
+	 */
+	ret = devm_regulator_get_enable_read_voltage(&spi->dev, "vref");
+	if (ret == -ENODEV)
 		st->vref_mv = 1250;
-	}
+	else if (ret < 0)
+		return ret;
+	else
+		st->vref_mv = ret / 1000;
 
 	indio_dev->name = spi_get_device_id(spi)->name;
 	indio_dev->modes = INDIO_DIRECT_MODE;

-- 
2.45.1