[PATCH v3 4/4] iio: adc: ad9467: check for backend capabilities

Tomas Melin
2026-01-14T10:46:58Z

Add capability checks for operation with backends that do not support
full set of features, but are otherwise compatible with the device.

Signed-off-by: Tomas Melin <tomas.melin@vaisala.com>
---
drivers/iio/adc/ad9467.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/adc/ad9467.c b/drivers/iio/adc/ad9467.c
index 9cfe66425d4e91e215cccc40e24a92c5e99e9b87..349779a049ad68b4c9f72abfc40154b4a3f2e095 100644
--- a/drivers/iio/adc/ad9467.c
+++ b/drivers/iio/adc/ad9467.c
@@ -645,6 +645,9 @@ static int ad9467_backend_testmode_on(struct ad9467_state *st,
};
int ret;

+ if (!iio_backend_has_caps(st->back, IIO_BACKEND_CAP_CALIBRATION))
+ return 0;
+
ret = iio_backend_data_format_set(st->back, chan, &data);
if (ret)
return ret;
@@ -665,6 +668,9 @@ static int ad9467_backend_testmode_off(struct ad9467_state *st,
};
int ret;

+ if (!iio_backend_has_caps(st->back, IIO_BACKEND_CAP_CALIBRATION))
+ return 0;
+
ret = iio_backend_chan_disable(st->back, chan);
if (ret)
return ret;
@@ -807,6 +813,9 @@ static int ad9467_calibrate(struct ad9467_state *st)
bool invert = false, stat;
int ret;

+ if (!iio_backend_has_caps(st->back, IIO_BACKEND_CAP_CALIBRATION))
+ return 0;
+
/* all points invalid */
bitmap_fill(st->calib_map, st->calib_map_size);

@@ -1357,7 +1366,7 @@ static int ad9467_probe(struct spi_device *spi)
return ret;

ret = devm_iio_backend_request_buffer(&spi->dev, st->back, indio_dev);
- if (ret)
+ if (ret && ret != -EOPNOTSUPP)
return ret;

ret = devm_iio_backend_enable(&spi->dev, st->back);

--
2.47.3