linux-kernel - [PATCH] iio: adc: ad7124: fix channel lookup in syscalib functions

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Message-Id: <20250726-iio-adc-ad7124-fix-channel-lookup-in-syscalib-v1-1-b9d14bb684af@baylibre.com>
Date: Sat, 26 Jul 2025 11:28:48 -0500
From: David Lechner <dlechner@...libre.com>
To: Michael Hennerich <Michael.Hennerich@...log.com>, 
 Jonathan Cameron <jic23@...nel.org>, 
 Nuno Sá <nuno.sa@...log.com>, 
 Andy Shevchenko <andy@...nel.org>, 
 Uwe Kleine-König <u.kleine-koenig@...libre.com>
Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>, 
 linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 David Lechner <dlechner@...libre.com>
Subject: [PATCH] iio: adc: ad7124: fix channel lookup in syscalib functions

Fix possible incorrect channel lookup in the syscalib functions by using
the correct channel address instead of the channel number.

In the ad7124 driver, the channel field of struct iio_chan_spec is the
input pin number of the positive input of the channel. This can be, but
is not always the same as the index in the channels array. The correct
index in the channels array is stored in the address field (and also
scan_index). We use the address field to perform the correct lookup.

Fixes: 47036a03a303 ("iio: adc: ad7124: Implement internal calibration at probe time")
Signed-off-by: David Lechner <dlechner@...libre.com>
---
 drivers/iio/adc/ad7124.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/iio/adc/ad7124.c b/drivers/iio/adc/ad7124.c
index 9808df2e92424283a86e9c105492c7447d071e44..4d8c6bafd1c3171054c72a0d2b13d6b1afc4e51a 100644
--- a/drivers/iio/adc/ad7124.c
+++ b/drivers/iio/adc/ad7124.c
@@ -849,7 +849,7 @@ enum {
 static int ad7124_syscalib_locked(struct ad7124_state *st, const struct iio_chan_spec *chan)
 {
 	struct device *dev = &st->sd.spi->dev;
-	struct ad7124_channel *ch = &st->channels[chan->channel];
+	struct ad7124_channel *ch = &st->channels[chan->address];
 	int ret;
 
 	if (ch->syscalib_mode == AD7124_SYSCALIB_ZERO_SCALE) {
@@ -865,8 +865,8 @@ static int ad7124_syscalib_locked(struct ad7124_state *st, const struct iio_chan
 		if (ret < 0)
 			return ret;
 
-		dev_dbg(dev, "offset for channel %d after zero-scale calibration: 0x%x\n",
-			chan->channel, ch->cfg.calibration_offset);
+		dev_dbg(dev, "offset for channel %lu after zero-scale calibration: 0x%x\n",
+			chan->address, ch->cfg.calibration_offset);
 	} else {
 		ch->cfg.calibration_gain = st->gain_default;
 
@@ -880,8 +880,8 @@ static int ad7124_syscalib_locked(struct ad7124_state *st, const struct iio_chan
 		if (ret < 0)
 			return ret;
 
-		dev_dbg(dev, "gain for channel %d after full-scale calibration: 0x%x\n",
-			chan->channel, ch->cfg.calibration_gain);
+		dev_dbg(dev, "gain for channel %lu after full-scale calibration: 0x%x\n",
+			chan->address, ch->cfg.calibration_gain);
 	}
 
 	return 0;
@@ -924,7 +924,7 @@ static int ad7124_set_syscalib_mode(struct iio_dev *indio_dev,
 {
 	struct ad7124_state *st = iio_priv(indio_dev);
 
-	st->channels[chan->channel].syscalib_mode = mode;
+	st->channels[chan->address].syscalib_mode = mode;
 
 	return 0;
 }
@@ -934,7 +934,7 @@ static int ad7124_get_syscalib_mode(struct iio_dev *indio_dev,
 {
 	struct ad7124_state *st = iio_priv(indio_dev);
 
-	return st->channels[chan->channel].syscalib_mode;
+	return st->channels[chan->address].syscalib_mode;
 }
 
 static const struct iio_enum ad7124_syscalib_mode_enum = {

---
base-commit: e4d9886ad25adae72f38f2b12f41649b101581ae
change-id: 20250726-iio-adc-ad7124-fix-channel-lookup-in-syscalib-e28c933ead2a

Best regards,
-- 
David Lechner <dlechner@...libre.com>