iio:adc:ad799x: Return more meaningful event enabled state

only report an event as enabled if it actually is enabled

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/adc/ad799x.c b/drivers/iio/adc/ad799x.c
index abc36c896470921c85ebecdecfaec6a77e5eee0a..08bcada394879858f34aaed60c055232d0034a6d 100644 (file)
--- a/drivers/iio/adc/ad799x.c
+++ b/drivers/iio/adc/ad799x.c
@@ -364,7 +364,15 @@ static int ad799x_read_event_config(struct iio_dev *indio_dev,
                                    enum iio_event_type type,
                                    enum iio_event_direction dir)
 {
-       return 1;
+       struct ad799x_state *st = iio_priv(indio_dev);
+
+       if (!(st->config & AD7998_ALERT_EN))
+               return 0;
+
+       if ((st->config >> AD799X_CHANNEL_SHIFT) & BIT(chan->scan_index))
+               return 1;
+
+       return 0;
 }
 
 static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan,