iio: humidity: hts211: Use devm_regulator_get_enable()

This driver only turns the power on at probe and off via a custom
devm_add_action_or_reset() callback. The new devm_regulator_get_enable()
replaces this boilerplate code.

Signed-off-by: Jonathan Cameron <[e-mail]>
Acked-by: Lorenzo Bianconi <[e-mail]>
Reviewed-by: Matti Vaittinen <[e-mail]>
Reviewed-by: Nuno Sá <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/iio/humidity/hts221.h

···
 #define HTS221_DEV_NAME		"hts221"
 
 #include <linux/iio/iio.h>
-#include <linux/regulator/consumer.h>
 
 enum hts221_sensor_type {
 	HTS221_SENSOR_H,
···
 	const char *name;
 	struct device *dev;
 	struct regmap *regmap;
-	struct regulator *vdd;
 
 	struct iio_trigger *trig;
 	int irq;

drivers/iio/humidity/hts221_core.c

···
 #include <linux/delay.h>
 #include <linux/pm.h>
 #include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
 #include <linux/bitfield.h>
 
 #include "hts221.h"
···
 
 static int hts221_init_regulators(struct device *dev)
 {
-	struct iio_dev *iio_dev = dev_get_drvdata(dev);
-	struct hts221_hw *hw = iio_priv(iio_dev);
 	int err;
 
-	hw->vdd = devm_regulator_get(dev, "vdd");
-	if (IS_ERR(hw->vdd))
-		return dev_err_probe(dev, PTR_ERR(hw->vdd),
-				     "failed to get vdd regulator\n");
-
-	err = regulator_enable(hw->vdd);
-	if (err) {
-		dev_err(dev, "failed to enable vdd regulator: %d\n", err);
-		return err;
-	}
+	err = devm_regulator_get_enable(dev, "vdd");
+	if (err)
+		return dev_err_probe(dev, err, "failed to get vdd regulator\n");
 
 	msleep(50);
 
 	return 0;
-}
-
-static void hts221_chip_uninit(void *data)
-{
-	struct hts221_hw *hw = data;
-
-	regulator_disable(hw->vdd);
 }
 
 int hts221_probe(struct device *dev, int irq, const char *name,
···
 	hw->regmap = regmap;
 
 	err = hts221_init_regulators(dev);
-	if (err)
-		return err;
-
-	err = devm_add_action_or_reset(dev, hts221_chip_uninit, hw);
 	if (err)
 		return err;