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/pressure/hid-sensor-press.c b/drivers/iio/pressure/hid-sensor-press.c
index ff69da4443b8..39df50c45dab 100644
--- a/drivers/iio/pressure/hid-sensor-press.c
+++ b/drivers/iio/pressure/hid-sensor-press.c
@@ -180,9 +180,8 @@ static int press_proc_event(struct hid_sensor_hub_device *hsdev,
         struct iio_dev *indio_dev = platform_get_drvdata(priv);
         struct press_state *press_state = iio_priv(indio_dev);
 
-        dev_dbg(&indio_dev->dev, "press_proc_event [%d]\n",
-                                press_state->common_attributes.data_ready);
-        if (press_state->common_attributes.data_ready)
+        dev_dbg(&indio_dev->dev, "press_proc_event\n");
+        if (atomic_read(&press_state->common_attributes.data_ready))
                 hid_sensor_push_data(indio_dev,
                                 &press_state->press_data,
                                 sizeof(press_state->press_data));
@@ -307,7 +306,7 @@ static int hid_press_probe(struct platform_device *pdev)
                 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
                 goto error_free_dev_mem;
         }
-        press_state->common_attributes.data_ready = false;
+        atomic_set(&press_state->common_attributes.data_ready, 0);
         ret = hid_sensor_setup_trigger(indio_dev, name,
                                 &press_state->common_attributes);
         if (ret) {