linux-kernel - [PATCH v2 3/3] iio: adc: ad9467: check for backend capabilities

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Message-Id: <20260113-b4-ad9467-optional-backend-v2-3-0a27e7e72f41@vaisala.com>
Date: Tue, 13 Jan 2026 12:12:49 +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 v2 3/3] iio: adc: ad9467: check for backend capabilities

For cases when the backend does not support test patterns or calibration,
do not attempt to use those features.

Signed-off-by: Tomas Melin <tomas.melin@...sala.com>
---
 drivers/iio/adc/ad9467.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/iio/adc/ad9467.c b/drivers/iio/adc/ad9467.c
index 9cfe66425d4e91e215cccc40e24a92c5e99e9b87..ce7dde8b79540bb0eabfba9470b3984e8723d4b7 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_caps(st->back, IIO_BACKEND_CAP_TEST_PATTERNS))
+		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_caps(st->back, IIO_BACKEND_CAP_TEST_PATTERNS))
+		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_caps(st->back, IIO_BACKEND_CAP_CALIBRATION))
+		return 0;
+
 	/* all points invalid */
 	bitmap_fill(st->calib_map, st->calib_map_size);
 

-- 
2.47.3