[PATCH] iio: light: isl29018: add optional vcc regulator operation support

[PATCH] iio: light: isl29018: add optional vcc regulator operation support

[Anson Huang]

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 vcc regulator operation support.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
---
 drivers/iio/light/isl29018.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/iio/light/isl29018.c b/drivers/iio/light/isl29018.c
index b45400f..47a55c8 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	*vcc_reg;
 };
 
 static int isl29018_set_integration_time(struct isl29018_chip *chip,
@@ -735,6 +737,15 @@ static int isl29018_probe(struct i2c_client *client,
 
 	mutex_init(&chip->lock);
 
+	chip->vcc_reg = devm_regulator_get_optional(&client->dev, "vcc");
+	if (!IS_ERR(chip->vcc_reg)) {
+		err = regulator_enable(chip->vcc_reg);
+		if (err) {
+			dev_err(&client->dev, "failed to enable VDD regulator\n");
+			return err;
+		}
+	}
+
 	chip->type = dev_id;
 	chip->calibscale = 1;
 	chip->ucalibscale = 0;
@@ -768,6 +779,7 @@ static int isl29018_probe(struct i2c_client *client,
 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 +789,14 @@ static int isl29018_suspend(struct device *dev)
 	 * So we do not have much to do here.
 	 */
 	chip->suspended = true;
+	if (!IS_ERR(chip->vcc_reg)) {
+		ret = regulator_disable(chip->vcc_reg);
+		if (ret) {
+			dev_err(dev, "failed to disable VDD regulator\n");
+			mutex_unlock(&chip->lock);
+			return ret;
+		}
+	}
 
 	mutex_unlock(&chip->lock);
 
@@ -790,6 +810,15 @@ static int isl29018_resume(struct device *dev)
 
 	mutex_lock(&chip->lock);
 
+	if (!IS_ERR(chip->vcc_reg)) {
+		err = regulator_enable(chip->vcc_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

Re: [PATCH] iio: light: isl29018: add optional vcc regulator operation support

[Fabio Estevam]

Hi Anson,

On Thu, Dec 6, 2018 at 1:17 AM Anson Huang <anson.huang@nxp.com> wrote:
>
> 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 vcc regulator operation support.
>
> Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
> ---
>  drivers/iio/light/isl29018.c | 29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)
>
> diff --git a/drivers/iio/light/isl29018.c b/drivers/iio/light/isl29018.c
> index b45400f..47a55c8 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        *vcc_reg;
>  };
>
>  static int isl29018_set_integration_time(struct isl29018_chip *chip,
> @@ -735,6 +737,15 @@ static int isl29018_probe(struct i2c_client *client,
>
>         mutex_init(&chip->lock);
>
> +       chip->vcc_reg = devm_regulator_get_optional(&client->dev, "vcc");
> +       if (!IS_ERR(chip->vcc_reg)) {
> +               err = regulator_enable(chip->vcc_reg);
> +               if (err) {
> +                       dev_err(&client->dev, "failed to enable VDD regulator\n");

You call the regulator as "vcc", but in the error message you mention
"VDD", which is confusing.

Same comment as in the previous patch.

There is no VCC regulator as per the datasheet. There are VDDD and
VDDA power supplies, so better represent both and with the same name
they appear in the datasheet.