6.12-stable review patch. If anyone has any objections, please let me know.
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From: Uwe Kleine-König u.kleine-koenig@baylibre.com
commit 4be339af334c283a1a1af3cb28e7e448a0aa8a7c upstream.
When during a measurement two channels are enabled, two measurements are done that are reported sequencially in the DATA register. As the code triggered by reading one of the sysfs properties expects that only one channel is enabled it only reads the first data set which might or might not belong to the intended channel.
To prevent this situation disable all channels during probe. This fixes a problem in practise because the reset default for channel 0 is enabled. So all measurements before the first measurement on channel 0 (which disables channel 0 at the end) might report wrong values.
Fixes: 7b8d045e497a ("iio: adc: ad7124: allow more than 8 channels") Reviewed-by: Nuno Sa nuno.sa@analog.com Signed-off-by: Uwe Kleine-König u.kleine-koenig@baylibre.com Link: https://patch.msgid.link/20241104101905.845737-2-u.kleine-koenig@baylibre.co... Cc: Stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/iio/adc/ad7124.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/drivers/iio/adc/ad7124.c +++ b/drivers/iio/adc/ad7124.c @@ -917,6 +917,9 @@ static int ad7124_setup(struct ad7124_st * set all channels to this default value. */ ad7124_set_channel_odr(st, i, 10); + + /* Disable all channels to prevent unintended conversions. */ + ad_sd_write_reg(&st->sd, AD7124_CHANNEL(i), 2, 0); }
ret = ad_sd_write_reg(&st->sd, AD7124_ADC_CONTROL, 2, st->adc_control);