Commit aa784a54 authored by Lorenzo Bianconi's avatar Lorenzo Bianconi Committed by Jonathan Cameron
Browse files

iio: humidity: hts221: add vdd voltage regulator 



Like all other ST sensors, hts221 devices have VDD power line.
Introduce VDD voltage regulator to control it.

Signed-off-by: default avatarLorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/r/6b3347e78f4f920c48eb6a66936d3b69cb9ff53a.1606045688.git.lorenzo@kernel.org


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 6c050782

drivers/iio/humidity/hts221.h

+2 −0
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ 
#define HTS221_DEV_NAME		"hts221"



#include <linux/iio/iio.h>

#include <linux/regulator/consumer.h>



enum hts221_sensor_type {

	HTS221_SENSOR_H,
@@ -29,6 +30,7 @@ struct hts221_hw { 
	const char *name;

	struct device *dev;

	struct regmap *regmap;

	struct regulator *vdd;



	struct iio_trigger *trig;

	int irq;

drivers/iio/humidity/hts221_core.c

+37 −0
Original line number Diff line number Diff line
@@ -547,6 +547,35 @@ static const struct iio_info hts221_info = { 


static const unsigned long hts221_scan_masks[] = {0x3, 0x0};



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;

	}



	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,

		 struct regmap *regmap)

{
@@ -567,6 +596,14 @@ int hts221_probe(struct device *dev, int irq, const char *name, 
	hw->irq = irq;

	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;



	err = hts221_check_whoami(hw);

	if (err < 0)

		return err;