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From: David Lechner <dlechner@baylibre.com>
To: Jonathan Cameron <jic23@kernel.org>
Cc: David Lechner <dlechner@baylibre.com>,
	Marcelo Schmitt <marcelo.schmitt1@gmail.com>,
	=?utf-8?q?Nuno_S=C3=A1?= <nuno.sa@analog.com>,
	Michael Hennerich <Michael.Hennerich@analog.com>,
	Mark Brown <broonie@kernel.org>,
	Liam Girdwood <lgirdwood@gmail.com>,
	linux-iio@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH 5/5] iio: adc: ad7944: use devm_regulator_get_enable_read_voltage
Date: Fri, 31 May 2024 16:19:36 -0500
Message-ID: <20240531-iio-adc-ref-supply-refactor-v1-5-4b313c0615ad@baylibre.com>
In-Reply-To: <20240531-iio-adc-ref-supply-refactor-v1-0-4b313c0615ad@baylibre.com>
References: <20240531-iio-adc-ref-supply-refactor-v1-0-4b313c0615ad@baylibre.com>
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This makes use of the new devm_regulator_get_enable_read_voltage()
function to reduce boilerplate code.

Signed-off-by: David Lechner <dlechner@baylibre.com>
---
 drivers/iio/adc/ad7944.c | 62 +++++++++++++++---------------------------------
 1 file changed, 19 insertions(+), 43 deletions(-)

diff --git a/drivers/iio/adc/ad7944.c b/drivers/iio/adc/ad7944.c
index e2cb64cef476..42bbcb904778 100644
--- a/drivers/iio/adc/ad7944.c
+++ b/drivers/iio/adc/ad7944.c
@@ -464,23 +464,16 @@ static const char * const ad7944_power_supplies[] = {
 	"avdd",	"dvdd",	"bvdd", "vio"
 };
 
-static void ad7944_ref_disable(void *ref)
-{
-	regulator_disable(ref);
-}
-
 static int ad7944_probe(struct spi_device *spi)
 {
 	const struct ad7944_chip_info *chip_info;
 	struct device *dev = &spi->dev;
 	struct iio_dev *indio_dev;
 	struct ad7944_adc *adc;
-	bool have_refin = false;
-	struct regulator *ref;
 	struct iio_chan_spec *chain_chan;
 	unsigned long *chain_scan_masks;
 	u32 n_chain_dev;
-	int ret;
+	int ret, ref_mv, refin_mv;
 
 	indio_dev = devm_iio_device_alloc(dev, sizeof(*adc));
 	if (!indio_dev)
@@ -531,47 +524,30 @@ static int ad7944_probe(struct spi_device *spi)
 	 * - external reference: REF is connected, REFIN is not connected
 	 */
 
-	ref = devm_regulator_get_optional(dev, "ref");
-	if (IS_ERR(ref)) {
-		if (PTR_ERR(ref) != -ENODEV)
-			return dev_err_probe(dev, PTR_ERR(ref),
-					     "failed to get REF supply\n");
-
-		ref = NULL;
-	}
+	ret = devm_regulator_get_enable_read_voltage(dev, "ref");
+	if (ret == -ENODEV)
+		ref_mv = 0;
+	else if (ret < 0)
+		return dev_err_probe(dev, ret, "failed to get REF voltage\n");
+	else
+		ref_mv = ret / 1000;
 
-	ret = devm_regulator_get_enable_optional(dev, "refin");
-	if (ret == 0)
-		have_refin = true;
-	else if (ret != -ENODEV)
-		return dev_err_probe(dev, ret,
-				     "failed to get and enable REFIN supply\n");
+	ret = devm_regulator_get_enable_read_voltage(dev, "refin");
+	if (ret == -ENODEV)
+		refin_mv = 0;
+	else if (ret < 0)
+		return dev_err_probe(dev, ret, "failed to get REFIN voltage\n");
+	else
+		refin_mv = ret / 1000;
 
-	if (have_refin && ref)
+	if (ref_mv && refin_mv)
 		return dev_err_probe(dev, -EINVAL,
 				     "cannot have both refin and ref supplies\n");
 
-	if (ref) {
-		ret = regulator_enable(ref);
-		if (ret)
-			return dev_err_probe(dev, ret,
-					     "failed to enable REF supply\n");
-
-		ret = devm_add_action_or_reset(dev, ad7944_ref_disable, ref);
-		if (ret)
-			return ret;
-
-		ret = regulator_get_voltage(ref);
-		if (ret < 0)
-			return dev_err_probe(dev, ret,
-					     "failed to get REF voltage\n");
-
-		/* external reference */
-		adc->ref_mv = ret / 1000;
-	} else {
-		/* internal reference */
+	if (ref_mv)
+		adc->ref_mv = ref_mv;
+	else
 		adc->ref_mv = AD7944_INTERNAL_REF_MV;
-	}
 
 	adc->cnv = devm_gpiod_get_optional(dev, "cnv", GPIOD_OUT_LOW);
 	if (IS_ERR(adc->cnv))

-- 
2.45.1