iio: adc: ad7173: fix calibration channel

commit 1d9a21ffb43b6fd326ead98f0d0afd6d104b739a upstream.

Fix the channel index values passed to ad_sd_calibrate() in
ad7173_calibrate_all().

ad7173_calibrate_all() expects these values to be that of the CHANNELx
register assigned to the channel, not the datasheet INPUTx number of the
channel. The incorrect values were causing register writes to fail for
some channels because they set the WEN bit that must always be 0 for
register access and set the R/W bit to read instead of write. For other
channels, the channel number was just wrong because the CHANNELx
registers are generally assigned in reverse order and so almost never
match the INPUTx numbers.

Fixes: 031bdc8aee01 ("iio: adc: ad7173: add calibration support")
Signed-off-by: David Lechner <dlechner@baylibre.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Link: https://patch.msgid.link/20250708-iio-adc-ad7313-fix-calibration-channel-v1-1-e6174e2c7cbf@baylibre.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/iio/adc/ad7173.c b/drivers/iio/adc/ad7173.c
index c41bc5b9ac597f57eea6a097cc3a118de7b42210..61749586670d4f0730ca423d6e4c0ee1bf19edfa 100644 (file)
--- a/drivers/iio/adc/ad7173.c
+++ b/drivers/iio/adc/ad7173.c
@@ -392,13 +392,12 @@ static int ad7173_calibrate_all(struct ad7173_state *st, struct iio_dev *indio_d
                if (indio_dev->channels[i].type != IIO_VOLTAGE)
                        continue;
 
-               ret = ad_sd_calibrate(&st->sd, AD7173_MODE_CAL_INT_ZERO, st->channels[i].ain);
+               ret = ad_sd_calibrate(&st->sd, AD7173_MODE_CAL_INT_ZERO, i);
                if (ret < 0)
                        return ret;
 
                if (st->info->has_internal_fs_calibration) {
-                       ret = ad_sd_calibrate(&st->sd, AD7173_MODE_CAL_INT_FULL,
-                                             st->channels[i].ain);
+                       ret = ad_sd_calibrate(&st->sd, AD7173_MODE_CAL_INT_FULL, i);
                        if (ret < 0)
                                return ret;
                }