On Thu, 6 Dec 2018 03:33:16 +0000
Anson Huang <anson.huang@xxxxxxx> 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@xxxxxxx>
> ---
> ChangeLog:
> replace "VDD" with "VCC" since the regulator name is vcc_reg.
Fabio has raised naming concerns so I'll assume we'll see a v3 with that.
One other comment inline.
Jonathan
> ---
> 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..87dcbce 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)) {
We should probably handle the case of deferred explicitly rather than
assuming all errors mean the regulator hasn't been provided.
> + err = regulator_enable(chip->vcc_reg);
> + if (err) {
> + dev_err(&client->dev, "failed to enable VCC 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 VCC 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 VCC regulator\n");
> + mutex_unlock(&chip->lock);
> + return err;
> + }
> + }
> +
> err = isl29018_chip_init(chip);
> if (!err)
> chip->suspended = false;
