linux-kernel - [PATCH v2 3/7] hwmon: (da9052) Use devm_regulator_get_enable_read

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Message-ID: <20240429-regulator-get-enable-get-votlage-v2-3-b1f11ab766c1@baylibre.com>
Date: Mon, 29 Apr 2024 18:40:11 -0500
From: David Lechner <dlechner@...libre.com>
To: Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Jean Delvare <jdelvare@...e.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Jonathan Cameron <jic23@...nel.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: David Lechner <dlechner@...libre.com>,
	Jonathan Corbet <corbet@....net>,
	Support Opensource <support.opensource@...semi.com>,
	Cosmin Tanislav <cosmin.tanislav@...log.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Michael Hennerich <Michael.Hennerich@...log.com>,
	Antoniu Miclaus <antoniu.miclaus@...log.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hwmon@...r.kernel.org,
	linux-iio@...r.kernel.org,
	linux-staging@...ts.linux.dev,
	linux-input@...r.kernel.org,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH v2 3/7] hwmon: (da9052) Use devm_regulator_get_enable_read_voltage()

We can reduce boilerplate code by using
devm_regulator_get_enable_read_voltage().

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: David Lechner <dlechner@...libre.com>
---

v2 changes:
* rename to devm_regulator_get_enable_read_voltage()
* add local variable tsiref_uv instead of using err
* restored error message via dev_err_probe()
* shortened pdev->dev to dev in lines we are touching anyway
---
 drivers/hwmon/da9052-hwmon.c | 38 ++++++++++----------------------------
 1 file changed, 10 insertions(+), 28 deletions(-)

diff --git a/drivers/hwmon/da9052-hwmon.c b/drivers/hwmon/da9052-hwmon.c
index 2bd7ae8100d7..7fb0c57dfef5 100644
--- a/drivers/hwmon/da9052-hwmon.c
+++ b/drivers/hwmon/da9052-hwmon.c
@@ -26,7 +26,6 @@ struct da9052_hwmon {
 	struct mutex		hwmon_lock;
 	bool			tsi_as_adc;
 	int			tsiref_mv;
-	struct regulator	*tsiref;
 	struct completion	tsidone;
 };
 
@@ -397,7 +396,7 @@ static int da9052_hwmon_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct da9052_hwmon *hwmon;
 	struct device *hwmon_dev;
-	int err;
+	int err, tsiref_uv;
 
 	hwmon = devm_kzalloc(dev, sizeof(struct da9052_hwmon), GFP_KERNEL);
 	if (!hwmon)
@@ -414,32 +413,20 @@ static int da9052_hwmon_probe(struct platform_device *pdev)
 		device_property_read_bool(pdev->dev.parent, "dlg,tsi-as-adc");
 
 	if (hwmon->tsi_as_adc) {
-		hwmon->tsiref = devm_regulator_get(pdev->dev.parent, "tsiref");
-		if (IS_ERR(hwmon->tsiref)) {
-			err = PTR_ERR(hwmon->tsiref);
-			dev_err(&pdev->dev, "failed to get tsiref: %d", err);
-			return err;
-		}
-
-		err = regulator_enable(hwmon->tsiref);
-		if (err)
-			return err;
-
-		hwmon->tsiref_mv = regulator_get_voltage(hwmon->tsiref);
-		if (hwmon->tsiref_mv < 0) {
-			err = hwmon->tsiref_mv;
-			goto exit_regulator;
-		}
+		tsiref_uv = devm_regulator_get_enable_read_voltage(dev->parent,
+								   "tsiref");
+		if (tsiref_uv < 0)
+			return dev_err_probe(dev, tsiref_uv,
+					     "failed to get tsiref voltage\n");
 
 		/* convert from microvolt (DT) to millivolt (hwmon) */
-		hwmon->tsiref_mv /= 1000;
+		hwmon->tsiref_mv = tsiref_uv / 1000;
 
 		/* TSIREF limits from datasheet */
 		if (hwmon->tsiref_mv < 1800 || hwmon->tsiref_mv > 2600) {
 			dev_err(hwmon->da9052->dev, "invalid TSIREF voltage: %d",
 				hwmon->tsiref_mv);
-			err = -ENXIO;
-			goto exit_regulator;
+			return -ENXIO;
 		}
 
 		/* disable touchscreen features */
@@ -456,7 +443,7 @@ static int da9052_hwmon_probe(struct platform_device *pdev)
 		if (err) {
 			dev_err(&pdev->dev, "Failed to register TSIRDY IRQ: %d",
 				err);
-			goto exit_regulator;
+			return err;
 		}
 	}
 
@@ -472,9 +459,6 @@ static int da9052_hwmon_probe(struct platform_device *pdev)
 exit_irq:
 	if (hwmon->tsi_as_adc)
 		da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
-exit_regulator:
-	if (hwmon->tsiref)
-		regulator_disable(hwmon->tsiref);
 
 	return err;
 }
@@ -483,10 +467,8 @@ static void da9052_hwmon_remove(struct platform_device *pdev)
 {
 	struct da9052_hwmon *hwmon = platform_get_drvdata(pdev);
 
-	if (hwmon->tsi_as_adc) {
+	if (hwmon->tsi_as_adc)
 		da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
-		regulator_disable(hwmon->tsiref);
-	}
 }
 
 static struct platform_driver da9052_hwmon_driver = {

-- 
2.43.2