iio: light: ltr390: Suspend and Resume support

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>
Link: https://patch.msgid.link/20240914181246.504450-3-abhashkumarjha123@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/light/ltr390.c b/drivers/iio/light/ltr390.c
index c50ea31e2316976579b7e68880fd84f997f7d9ca..6c2425f0ba22a1f65024fd5372ef54722d888aa9 100644 (file)
--- a/drivers/iio/light/ltr390.c
+++ b/drivers/iio/light/ltr390.c
@@ -18,6 +18,7 @@
  *   - Interrupt support
  */
 
+#include <linux/device.h>
 #include <linux/i2c.h>
 #include <linux/math.h>
 #include <linux/module.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,