[PATCH 07/14] iio: st_sensors: core and lsm9ds0 switch to devm_regulator_bulk_get_enable()

[Jonathan Cameron <jic23@kernel.org>]

From: Jonathan Cameron <Jonathan.Cameron@huawei.com>

These drivers only turns the power on at probe and off via a custom
devm_add_action_or_reset() callback. The two regulators were handled
separately so also switch to bulk registration.
The new devm_regulator_bulk_get_enable() replaces all this boilerplate
code.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

---

An alternative here would be to also refactor st_sensors_power_enable()
to take the struct dev of the parent device (I2C or SPI).

Then we could use the same function for st_lsm9d0_probe().
My view is it isn't worth the churn.
---
 .../iio/common/st_sensors/st_sensors_core.c   | 39 ++---------
 drivers/iio/imu/st_lsm9ds0/st_lsm9ds0_core.c  | 65 ++-----------------
 include/linux/iio/common/st_sensors.h         |  4 --
 3 files changed, 14 insertions(+), 94 deletions(-)

diff --git a/drivers/iio/common/st_sensors/st_sensors_core.c b/drivers/iio/common/st_sensors/st_sensors_core.c
index 35720c64fea8..c77d7bdcc121 100644
--- a/drivers/iio/common/st_sensors/st_sensors_core.c
+++ b/drivers/iio/common/st_sensors/st_sensors_core.c
@@ -219,47 +219,22 @@ int st_sensors_set_axis_enable(struct iio_dev *indio_dev, u8 axis_enable)
 }
 EXPORT_SYMBOL_NS(st_sensors_set_axis_enable, IIO_ST_SENSORS);
 
-static void st_reg_disable(void *reg)
-{
-	regulator_disable(reg);
-}
 
 int st_sensors_power_enable(struct iio_dev *indio_dev)
 {
-	struct st_sensor_data *pdata = iio_priv(indio_dev);
+	static const char * const regulator_names[] = { "vdd", "vddio" };
 	struct device *parent = indio_dev->dev.parent;
 	int err;
 
 	/* Regulators not mandatory, but if requested we should enable them. */
-	pdata->vdd = devm_regulator_get(parent, "vdd");
-	if (IS_ERR(pdata->vdd))
-		return dev_err_probe(&indio_dev->dev, PTR_ERR(pdata->vdd),
-				     "unable to get Vdd supply\n");
-
-	err = regulator_enable(pdata->vdd);
-	if (err != 0) {
-		dev_warn(&indio_dev->dev,
-			 "Failed to enable specified Vdd supply\n");
-		return err;
-	}
-
-	err = devm_add_action_or_reset(parent, st_reg_disable, pdata->vdd);
+	err = devm_regulator_bulk_get_enable(parent,
+					     ARRAY_SIZE(regulator_names),
+					     regulator_names);
 	if (err)
-		return err;
+		return dev_err_probe(&indio_dev->dev, err,
+				     "unable to enable supplies\n");
 
-	pdata->vdd_io = devm_regulator_get(parent, "vddio");
-	if (IS_ERR(pdata->vdd_io))
-		return dev_err_probe(&indio_dev->dev, PTR_ERR(pdata->vdd_io),
-				     "unable to get Vdd_IO supply\n");
-
-	err = regulator_enable(pdata->vdd_io);
-	if (err != 0) {
-		dev_warn(&indio_dev->dev,
-			 "Failed to enable specified Vdd_IO supply\n");
-		return err;
-	}
-
-	return devm_add_action_or_reset(parent, st_reg_disable, pdata->vdd_io);
+	return 0;
 }
 EXPORT_SYMBOL_NS(st_sensors_power_enable, IIO_ST_SENSORS);
 
diff --git a/drivers/iio/imu/st_lsm9ds0/st_lsm9ds0_core.c b/drivers/iio/imu/st_lsm9ds0/st_lsm9ds0_core.c
index ae7bc815382f..e887b45cdbcd 100644
--- a/drivers/iio/imu/st_lsm9ds0/st_lsm9ds0_core.c
+++ b/drivers/iio/imu/st_lsm9ds0/st_lsm9ds0_core.c
@@ -18,58 +18,6 @@
 
 #include "st_lsm9ds0.h"
 
-static int st_lsm9ds0_power_enable(struct device *dev, struct st_lsm9ds0 *lsm9ds0)
-{
-	int ret;
-
-	/* Regulators not mandatory, but if requested we should enable them. */
-	lsm9ds0->vdd = devm_regulator_get(dev, "vdd");
-	if (IS_ERR(lsm9ds0->vdd))
-		return dev_err_probe(dev, PTR_ERR(lsm9ds0->vdd),
-				     "unable to get Vdd supply\n");
-
-	ret = regulator_enable(lsm9ds0->vdd);
-	if (ret) {
-		dev_warn(dev, "Failed to enable specified Vdd supply\n");
-		return ret;
-	}
-
-	lsm9ds0->vdd_io = devm_regulator_get(dev, "vddio");
-	if (IS_ERR(lsm9ds0->vdd_io)) {
-		regulator_disable(lsm9ds0->vdd);
-		return dev_err_probe(dev, PTR_ERR(lsm9ds0->vdd_io),
-				     "unable to get Vdd_IO supply\n");
-	}
-	ret = regulator_enable(lsm9ds0->vdd_io);
-	if (ret) {
-		dev_warn(dev, "Failed to enable specified Vdd_IO supply\n");
-		regulator_disable(lsm9ds0->vdd);
-		return ret;
-	}
-
-	return 0;
-}
-
-static void st_lsm9ds0_power_disable(void *data)
-{
-	struct st_lsm9ds0 *lsm9ds0 = data;
-
-	regulator_disable(lsm9ds0->vdd_io);
-	regulator_disable(lsm9ds0->vdd);
-}
-
-static int devm_st_lsm9ds0_power_enable(struct st_lsm9ds0 *lsm9ds0)
-{
-	struct device *dev = lsm9ds0->dev;
-	int ret;
-
-	ret = st_lsm9ds0_power_enable(dev, lsm9ds0);
-	if (ret)
-		return ret;
-
-	return devm_add_action_or_reset(dev, st_lsm9ds0_power_disable, lsm9ds0);
-}
-
 static int st_lsm9ds0_probe_accel(struct st_lsm9ds0 *lsm9ds0, struct regmap *regmap)
 {
 	const struct st_sensor_settings *settings;
@@ -92,8 +40,6 @@ static int st_lsm9ds0_probe_accel(struct st_lsm9ds0 *lsm9ds0, struct regmap *reg
 	data->sensor_settings = (struct st_sensor_settings *)settings;
 	data->irq = lsm9ds0->irq;
 	data->regmap = regmap;
-	data->vdd = lsm9ds0->vdd;
-	data->vdd_io = lsm9ds0->vdd_io;
 
 	return st_accel_common_probe(lsm9ds0->accel);
 }
@@ -120,19 +66,22 @@ static int st_lsm9ds0_probe_magn(struct st_lsm9ds0 *lsm9ds0, struct regmap *regm
 	data->sensor_settings = (struct st_sensor_settings *)settings;
 	data->irq = lsm9ds0->irq;
 	data->regmap = regmap;
-	data->vdd = lsm9ds0->vdd;
-	data->vdd_io = lsm9ds0->vdd_io;
 
 	return st_magn_common_probe(lsm9ds0->magn);
 }
 
 int st_lsm9ds0_probe(struct st_lsm9ds0 *lsm9ds0, struct regmap *regmap)
 {
+	struct device *dev = lsm9ds0->dev;
+	static const char * const regulator_names[] = { "vdd", "vddio" };
 	int ret;
 
-	ret = devm_st_lsm9ds0_power_enable(lsm9ds0);
+	/* Regulators not mandatory, but if requested we should enable them. */
+	ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(regulator_names),
+					     regulator_names);
 	if (ret)
-		return ret;
+		return dev_err_probe(dev, ret,
+				     "unable to enable Vdd supply\n");
 
 	/* Setup accelerometer device */
 	ret = st_lsm9ds0_probe_accel(lsm9ds0, regmap);
diff --git a/include/linux/iio/common/st_sensors.h b/include/linux/iio/common/st_sensors.h
index db4a1b260348..f5f3ee57bc70 100644
--- a/include/linux/iio/common/st_sensors.h
+++ b/include/linux/iio/common/st_sensors.h
@@ -224,8 +224,6 @@ struct st_sensor_settings {
  * @mount_matrix: The mounting matrix of the sensor.
  * @sensor_settings: Pointer to the specific sensor settings in use.
  * @current_fullscale: Maximum range of measure by the sensor.
- * @vdd: Pointer to sensor's Vdd power supply
- * @vdd_io: Pointer to sensor's Vdd-IO power supply
  * @regmap: Pointer to specific sensor regmap configuration.
  * @enabled: Status of the sensor (false->off, true->on).
  * @odr: Output data rate of the sensor [Hz].
@@ -244,8 +242,6 @@ struct st_sensor_data {
 	struct iio_mount_matrix mount_matrix;
 	struct st_sensor_settings *sensor_settings;
 	struct st_sensor_fullscale_avl *current_fullscale;
-	struct regulator *vdd;
-	struct regulator *vdd_io;
 	struct regmap *regmap;
 
 	bool enabled;
-- 
2.37.2