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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: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/r/6b3347e78f4f920c48eb6a66936d3b69cb9ff53a.1606045688.git.lorenzo@kernel.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Lorenzo Bianconi 2020-11-22 12:56:48 +01:00 committed by Jonathan Cameron
parent 6c050782d0
commit aa784a5410
2 changed files with 39 additions and 0 deletions
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2
drivers/iio/humidity/hts221.h
View File

@ -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;

37
drivers/iio/humidity/hts221_core.c
View File

@ -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;