Added support for suspend and resume PM ops.
We suspend the sensor by clearing the ALS_UVS_EN bit in the MAIN CONTROL
register. And we resume it by setting that bit.

Signed-off-by: Abhash Jha <abhashkumarjha123@gmail.com>
---
 drivers/iio/light/ltr390.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/iio/light/ltr390.c b/drivers/iio/light/ltr390.c
index 73ef4a5a0..c4ff26d68 100644
--- a/drivers/iio/light/ltr390.c
+++ b/drivers/iio/light/ltr390.c
@@ -432,6 +432,24 @@ static int ltr390_probe(struct i2c_client *client)
 	return devm_iio_device_register(dev, indio_dev);
 }
 
+static int ltr390_suspend(struct device *dev)
+{
+	struct ltr390_data *data = iio_priv(i2c_get_clientdata(
+						to_i2c_client(dev)));
+
+	return regmap_clear_bits(data->regmap, LTR390_MAIN_CTRL, LTR390_SENSOR_ENABLE);
+}
+
+static int ltr390_resume(struct device *dev)
+{
+	struct ltr390_data *data = iio_priv(i2c_get_clientdata(
+						to_i2c_client(dev)));
+
+	return regmap_set_bits(data->regmap, LTR390_MAIN_CTRL, LTR390_SENSOR_ENABLE);
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(ltr390_pm_ops, ltr390_suspend, ltr390_resume);
+
 static const struct i2c_device_id ltr390_id[] = {
 	{ "ltr390" },
 	{ /* Sentinel */ }
@@ -448,6 +466,7 @@ static struct i2c_driver ltr390_driver = {
 	.driver = {
 		.name = "ltr390",
 		.of_match_table = ltr390_of_table,
+		.pm	= pm_sleep_ptr(&ltr390_pm_ops),
 	},
 	.probe = ltr390_probe,
 	.id_table = ltr390_id,
-- 
2.43.0

On Tue, 10 Sep 2024 10:20:27 +0530
Abhash Jha <abhashkumarjha123@gmail.com> wrote:

> Added support for suspend and resume PM ops.
> We suspend the sensor by clearing the ALS_UVS_EN bit in the MAIN CONTROL
> register. And we resume it by setting that bit.
> 
> Signed-off-by: Abhash Jha <abhashkumarjha123@gmail.com>
> ---
>  drivers/iio/light/ltr390.c | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/drivers/iio/light/ltr390.c b/drivers/iio/light/ltr390.c
> index 73ef4a5a0..c4ff26d68 100644
> --- a/drivers/iio/light/ltr390.c
> +++ b/drivers/iio/light/ltr390.c
> @@ -432,6 +432,24 @@ static int ltr390_probe(struct i2c_client *client)
>  	return devm_iio_device_register(dev, indio_dev);
>  }
>  
> +static int ltr390_suspend(struct device *dev)
> +{
> +	struct ltr390_data *data = iio_priv(i2c_get_clientdata(
> +						to_i2c_client(dev)));
That's somewhat ugly.  I'd jsut have another local variable.
Can also use the access directly from the dev, not via the i2c_client
(it's the same data either way and common practice to get it directly from
dev).

	struct iio_dev *indio_dev = dev_get_drvdata(dev);

> +
> +	return regmap_clear_bits(data->regmap, LTR390_MAIN_CTRL, LTR390_SENSOR_ENABLE);

Lines is a little long: wrap after CTRL,

> +}
> +
> +static int ltr390_resume(struct device *dev)
> +{
> +	struct ltr390_data *data = iio_priv(i2c_get_clientdata(
> +						to_i2c_client(dev)));
As above.
> +
> +	return regmap_set_bits(data->regmap, LTR390_MAIN_CTRL, LTR390_SENSOR_ENABLE);
> +}
> +
> +static DEFINE_SIMPLE_DEV_PM_OPS(ltr390_pm_ops, ltr390_suspend, ltr390_resume);
> +
>  static const struct i2c_device_id ltr390_id[] = {
>  	{ "ltr390" },
>  	{ /* Sentinel */ }
> @@ -448,6 +466,7 @@ static struct i2c_driver ltr390_driver = {
>  	.driver = {
>  		.name = "ltr390",
>  		.of_match_table = ltr390_of_table,
> +		.pm	= pm_sleep_ptr(&ltr390_pm_ops),
>  	},
>  	.probe = ltr390_probe,
>  	.id_table = ltr390_id,