[PATCH v3 2/4] iio: light: ltr390: Suspend and Resume support

[Abhash Jha <abhashkumarjha123@xxxxxxxxx>]

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@xxxxxxxxx>
---
 drivers/iio/light/ltr390.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/iio/light/ltr390.c b/drivers/iio/light/ltr390.c
index c50ea31e2..e152009b5 100644
--- a/drivers/iio/light/ltr390.c
+++ b/drivers/iio/light/ltr390.c
@@ -24,6 +24,7 @@
 #include <linux/mutex.h>
 #include <linux/regmap.h>
 #include <linux/bitfield.h>
+#include <linux/device.h>
 
 #include <linux/iio/iio.h>
 
@@ -430,6 +431,26 @@ static int ltr390_probe(struct i2c_client *client)
 	return devm_iio_device_register(dev, indio_dev);
 }
 
+static int ltr390_suspend(struct device *dev)
+{
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct ltr390_data *data = iio_priv(indio_dev);
+
+	return regmap_clear_bits(data->regmap, LTR390_MAIN_CTRL,
+				LTR390_SENSOR_ENABLE);
+}
+
+static int ltr390_resume(struct device *dev)
+{
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct ltr390_data *data = iio_priv(indio_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 */ }
@@ -446,6 +467,7 @@ 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