iio: hid-sensors: Add API to power on/off

Added an API to allow client drivers to turn ON and OFF sensors for
quick read. Added data_read as counting varaible instead of boolean,
so that sensor is powered off only when last user released it.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 3 insertions, 4 deletions

diff --git a/drivers/iio/magnetometer/hid-sensor-magn-3d.c b/drivers/iio/magnetometer/hid-sensor-magn-3d.c
index 131ced0dcb1c..54eea6a17061 100644
--- a/drivers/iio/magnetometer/hid-sensor-magn-3d.c
+++ b/drivers/iio/magnetometer/hid-sensor-magn-3d.c
@@ -202,9 +202,8 @@ static int magn_3d_proc_event(struct hid_sensor_hub_device *hsdev,
         struct iio_dev *indio_dev = platform_get_drvdata(priv);
         struct magn_3d_state *magn_state = iio_priv(indio_dev);
 
-        dev_dbg(&indio_dev->dev, "magn_3d_proc_event [%d]\n",
-                                magn_state->common_attributes.data_ready);
-        if (magn_state->common_attributes.data_ready)
+        dev_dbg(&indio_dev->dev, "magn_3d_proc_event\n");
+        if (atomic_read(&magn_state->common_attributes.data_ready))
                 hid_sensor_push_data(indio_dev,
                                 magn_state->magn_val,
                                 sizeof(magn_state->magn_val));
@@ -343,7 +342,7 @@ static int hid_magn_3d_probe(struct platform_device *pdev)
                 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
                 goto error_free_dev_mem;
         }
-        magn_state->common_attributes.data_ready = false;
+        atomic_set(&magn_state->common_attributes.data_ready, 0);
         ret = hid_sensor_setup_trigger(indio_dev, name,
                                         &magn_state->common_attributes);
         if (ret < 0) {