[PATCH 5/6] iio: dac: ad5791: Use devm_regulator_get_enable_read_voltage

[ahaslam@xxxxxxxxxxxx]

From: Axel Haslam <ahaslam@xxxxxxxxxxxx>

Simplify probe by using of the devm_regulator_get_enable_read_voltage.

Suggested-by: David Lechner <dlechner@xxxxxxxxxxxx>
Signed-off-by: Axel Haslam <ahaslam@xxxxxxxxxxxx>
---
 drivers/iio/dac/ad5791.c | 56 +++++++++-------------------------------
 1 file changed, 12 insertions(+), 44 deletions(-)

diff --git a/drivers/iio/dac/ad5791.c b/drivers/iio/dac/ad5791.c
index a7cf19346cf0..cf3d41a10c20 100644
--- a/drivers/iio/dac/ad5791.c
+++ b/drivers/iio/dac/ad5791.c
@@ -356,32 +356,6 @@ static int ad5791_probe(struct spi_device *spi)
 	if (IS_ERR(st->gpio_ldac))
 		return PTR_ERR(st->gpio_ldac);
 
-	st->reg_vdd = devm_regulator_get(&spi->dev, "vdd");
-	if (!IS_ERR(st->reg_vdd)) {
-		ret = regulator_enable(st->reg_vdd);
-		if (ret)
-			return ret;
-
-		ret = regulator_get_voltage(st->reg_vdd);
-		if (ret < 0)
-			goto error_disable_reg_pos;
-
-		pos_voltage_uv = ret;
-	}
-
-	st->reg_vss = devm_regulator_get(&spi->dev, "vss");
-	if (!IS_ERR(st->reg_vss)) {
-		ret = regulator_enable(st->reg_vss);
-		if (ret)
-			goto error_disable_reg_pos;
-
-		ret = regulator_get_voltage(st->reg_vss);
-		if (ret < 0)
-			goto error_disable_reg_neg;
-
-		neg_voltage_uv = ret;
-	}
-
 	st->pwr_down = true;
 	st->spi = spi;
 
@@ -391,7 +365,15 @@ static int ad5791_probe(struct spi_device *spi)
 		use_rbuf_gain2 = device_property_read_bool(&spi->dev,
 							   "adi,rbuf-gain2-en");
 
-	if (!IS_ERR(st->reg_vss) && !IS_ERR(st->reg_vdd)) {
+	pos_voltage_uv = devm_regulator_get_enable_read_voltage(&spi->dev, "vdd");
+	if (pos_voltage_uv < 0 && pos_voltage_uv != -ENODEV)
+		return dev_err_probe(&spi->dev, ret, "failed to get vdd voltage\n");
+
+	neg_voltage_uv = devm_regulator_get_enable_read_voltage(&spi->dev, "vss");
+	if (neg_voltage_uv < 0 && neg_voltage_uv != -ENODEV)
+		return dev_err_probe(&spi->dev, ret, "failed to get vss voltage\n");
+
+	if (neg_voltage_uv >= 0 && pos_voltage_uv >= 0) {
 		st->vref_mv = (pos_voltage_uv + neg_voltage_uv) / 1000;
 		st->vref_neg_mv = neg_voltage_uv / 1000;
 	} else if (pdata) {
@@ -407,7 +389,7 @@ static int ad5791_probe(struct spi_device *spi)
 	} else {
 		ret = ad5791_spi_write(st, AD5791_ADDR_SW_CTRL, AD5791_SWCTRL_RESET);
 		if (ret)
-			goto error_disable_reg_neg;
+			return dev_err_probe(&spi->dev, ret, "fail to reset\n");
 	}
 
 	st->chip_info = spi_get_device_match_data(spi);
@@ -421,7 +403,7 @@ static int ad5791_probe(struct spi_device *spi)
 	ret = ad5791_spi_write(st, AD5791_ADDR_CTRL, st->ctrl |
 		AD5791_CTRL_OPGND | AD5791_CTRL_DACTRI);
 	if (ret)
-		goto error_disable_reg_neg;
+		return dev_err_probe(&spi->dev, ret, "fail to write ctrl register\n");
 
 	spi_set_drvdata(spi, indio_dev);
 	indio_dev->info = &ad5791_info;
@@ -431,30 +413,16 @@ static int ad5791_probe(struct spi_device *spi)
 	indio_dev->name = st->chip_info->name;
 	ret = iio_device_register(indio_dev);
 	if (ret)
-		goto error_disable_reg_neg;
+		return dev_err_probe(&spi->dev, ret, "unable to register iio device\n");
 
 	return 0;
-
-error_disable_reg_neg:
-	if (!IS_ERR(st->reg_vss))
-		regulator_disable(st->reg_vss);
-error_disable_reg_pos:
-	if (!IS_ERR(st->reg_vdd))
-		regulator_disable(st->reg_vdd);
-	return ret;
 }
 
 static void ad5791_remove(struct spi_device *spi)
 {
 	struct iio_dev *indio_dev = spi_get_drvdata(spi);
-	struct ad5791_state *st = iio_priv(indio_dev);
 
 	iio_device_unregister(indio_dev);
-	if (!IS_ERR(st->reg_vdd))
-		regulator_disable(st->reg_vdd);
-
-	if (!IS_ERR(st->reg_vss))
-		regulator_disable(st->reg_vss);
 }
 
 static const struct of_device_id ad5791_of_match[] = {
-- 
2.34.1