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

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Message-Id: <20260114-b4-ad9467-optional-backend-v3-4-d2c84979d010@vaisala.com>
Date: Wed, 14 Jan 2026 10:45:53 +0000
From: Tomas Melin <tomas.melin@...sala.com>
To: Michael Hennerich <Michael.Hennerich@...log.com>, 
 Nuno Sa <nuno.sa@...log.com>, Lars-Peter Clausen <lars@...afoo.de>, 
 Jonathan Cameron <jic23@...nel.org>, David Lechner <dlechner@...libre.com>, 
 Andy Shevchenko <andy@...nel.org>, 
 Olivier Moysan <olivier.moysan@...s.st.com>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Tomas Melin <tomas.melin@...sala.com>
Subject: [PATCH v3 4/4] iio: adc: ad9467: check for backend capabilities

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@...sala.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