[PATCH V5 2/2] iio: light: isl29018: add optional vdd regulator operation support

Anson Huang
2018-12-11T05:02:55Z

The light sensor's power supply could be controlled by regulator
on some platforms, such as i.MX6Q-SABRESD board, the light sensor
isl29023's power supply is controlled by a GPIO fixed regulator,
need to make sure the regulator is enabled before any operation of
sensor, this patch adds optional vdd regulator operation support.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
---
ChangeLog since V4:
Since ONLY isl29018 has two power supplies and they are MUST shorted externally, so they can be
treated as one power supply as well, using one regulator for driver.
---
drivers/iio/light/isl29018.c | 47 +++++++++++++++++++++++++++++++++++++++++---
1 file changed, 44 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/light/isl29018.c b/drivers/iio/light/isl29018.c
index b45400f..5e3d1c1 100644
--- a/drivers/iio/light/isl29018.c
+++ b/drivers/iio/light/isl29018.c
@@ -23,6 +23,7 @@
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
@@ -95,6 +96,7 @@ struct isl29018_chip {
struct isl29018_scale scale;
int prox_scheme;
bool suspended;
+ struct regulator *vdd_reg;
};

static int isl29018_set_integration_time(struct isl29018_chip *chip,
@@ -735,6 +737,19 @@ static int isl29018_probe(struct i2c_client *client,

mutex_init(&chip->lock);

+ chip->vdd_reg = devm_regulator_get_optional(&client->dev, "vdd");
+ if (!IS_ERR(chip->vdd_reg)) {
+ err = regulator_enable(chip->vdd_reg);
+ if (err) {
+ dev_err(&client->dev, "failed to enable VDD regulator\n");
+ return err;
+ }
+ } else {
+ err = PTR_ERR(chip->vdd_reg);
+ if (err != -ENODEV)
+ return err;
+ }
+
chip->type = dev_id;
chip->calibscale = 1;
chip->ucalibscale = 0;
@@ -747,12 +762,12 @@ static int isl29018_probe(struct i2c_client *client,
if (IS_ERR(chip->regmap)) {
err = PTR_ERR(chip->regmap);
dev_err(&client->dev, "regmap initialization fails: %d\n", err);
- return err;
+ goto disable_regulator;
}

err = isl29018_chip_init(chip);
if (err)
- return err;
+ goto disable_regulator;

indio_dev->info = isl29018_chip_info_tbl[dev_id].indio_info;
indio_dev->channels = isl29018_chip_info_tbl[dev_id].channels;
@@ -761,13 +776,22 @@ static int isl29018_probe(struct i2c_client *client,
indio_dev->dev.parent = &client->dev;
indio_dev->modes = INDIO_DIRECT_MODE;

- return devm_iio_device_register(&client->dev, indio_dev);
+ err = devm_iio_device_register(&client->dev, indio_dev);
+ if (!err)
+ return 0;
+
+disable_regulator:
+ if (!IS_ERR(chip->vdd_reg))
+ regulator_disable(chip->vdd_reg);
+
+ return err;
}

#ifdef CONFIG_PM_SLEEP
static int isl29018_suspend(struct device *dev)
{
struct isl29018_chip *chip = iio_priv(dev_get_drvdata(dev));
+ int ret;

mutex_lock(&chip->lock);

@@ -777,6 +801,14 @@ static int isl29018_suspend(struct device *dev)
* So we do not have much to do here.
*/
chip->suspended = true;
+ if (!IS_ERR(chip->vdd_reg)) {
+ ret = regulator_disable(chip->vdd_reg);
+ if (ret) {
+ dev_err(dev, "failed to disable VDD regulator\n");
+ mutex_unlock(&chip->lock);
+ return ret;
+ }
+ }

mutex_unlock(&chip->lock);

@@ -790,6 +822,15 @@ static int isl29018_resume(struct device *dev)

mutex_lock(&chip->lock);

+ if (!IS_ERR(chip->vdd_reg)) {
+ err = regulator_enable(chip->vdd_reg);
+ if (err) {
+ dev_err(dev, "failed to enable VDD regulator\n");
+ mutex_unlock(&chip->lock);
+ return err;
+ }
+ }
+
err = isl29018_chip_init(chip);
if (!err)
chip->suspended = false;
--
2.7.4