iio: st_sensors: add debugfs register read hook

This adds a debugfs hook to read/write registers in the ST
sensors using debugfs. Proved to be awesome help when trying
to debug why IRQs do not arrive.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Denis Ciocca <denis.ciocca@st.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/iio/common/st_sensors.h b/include/linux/iio/common/st_sensors.h
index 3c17cd7fdf06..2fe939c73cd2 100644
--- a/include/linux/iio/common/st_sensors.h
+++ b/include/linux/iio/common/st_sensors.h
@@ -271,6 +271,10 @@ void st_sensors_power_enable(struct iio_dev *indio_dev);
 
 void st_sensors_power_disable(struct iio_dev *indio_dev);
 
+int st_sensors_debugfs_reg_access(struct iio_dev *indio_dev,
+                                  unsigned reg, unsigned writeval,
+                                  unsigned *readval);
+
 int st_sensors_set_odr(struct iio_dev *indio_dev, unsigned int odr);
 
 int st_sensors_set_dataready_irq(struct iio_dev *indio_dev, bool enable);