iio: bmc150: exit early if event / trigger state is not changed

Previous of this patch the check was only done if we enabled the event
and it was already enabled. We can do the same if the event is
disabled and we want to disable it.

The patch also adds the same check on the trigger code.

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

drivers/iio/accel/bmc150-accel.c

@@ -748,7 +748,7 @@ static int bmc150_accel_write_event_config(struct iio_dev *indio_dev,
 	struct bmc150_accel_data *data = iio_priv(indio_dev);
 	int ret;
 
-	if (state && data->ev_enable_state)
+	if (state == data->ev_enable_state)
 		return 0;
 
 	mutex_lock(&data->mutex);
@@ -984,6 +984,18 @@ static int bmc150_accel_data_rdy_trigger_set_state(struct iio_trigger *trig,
 
 	mutex_lock(&data->mutex);
 
+	if (data->motion_trig == trig) {
+		if (data->motion_trigger_on == state) {
+			mutex_unlock(&data->mutex);
+			return 0;
+		}
+	} else {
+		if (data->dready_trigger_on == state) {
+			mutex_unlock(&data->mutex);
+			return 0;
+		}
+	}
+
 	if (!state && data->ev_enable_state && data->motion_trigger_on) {
 		data->motion_trigger_on = false;
 		mutex_unlock(&data->mutex);