[PATCH v3 6/6] iio: imu: st_lsm6dsx: prohibit the use of events and buffered reads simultaneously

[Sean Nyekjaer <sean@geanix.com>]

When events and buffered reads is enabled simultaneously, and the first
event accours the interrupt pin stays high.

This can be reverted when we find a solution to allow events and
buffered reads simultaneously.

Signed-off-by: Sean Nyekjaer <sean@geanix.com>
---
 drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c | 3 +++
 drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c   | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
index ef579650fd52..94e8884a1db1 100644
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
@@ -601,6 +601,9 @@ int st_lsm6dsx_update_fifo(struct st_lsm6dsx_sensor *sensor, bool enable)
 	struct st_lsm6dsx_hw *hw = sensor->hw;
 	int err;
 
+	if (hw->enable_event)
+		return -EBUSY;
+
 	mutex_lock(&hw->conf_lock);
 
 	if (hw->fifo_mode != ST_LSM6DSX_FIFO_BYPASS) {
diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
index 2114c3c78888..7d0850df0a5e 100644
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
@@ -1277,6 +1277,9 @@ static int st_lsm6dsx_write_event_config(struct iio_dev *iio_dev,
 	if (type != IIO_EV_TYPE_THRESH)
 		return -EINVAL;
 
+	if (hw->fifo_mode != ST_LSM6DSX_FIFO_BYPASS)
+		return -EBUSY;
+
 	if (state && hw->enable_event)
 		return 0;
 
-- 
2.23.0