On 15/04/15 20:11, Thomas Betker wrote:
> From: Thomas Betker <thomas.betker@xxxxxxxxxxxxxxxxx>
>
> The VREFN channel is bipolar, not unipolar. Small negative values do
> occur (e.g., -1mV), and unsigned conversion maps them incorrectly to
> large positive values (about +1V), so fix this.
>
> Signed-off-by: Thomas Betker <thomas.betker@xxxxxxxxxxxxxxxxx>
Applied to the fixes-togreg branch of iio.git. Marked for stable.
Thanks,
Jonathan
> ---
> drivers/iio/adc/xilinx-xadc-core.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/iio/adc/xilinx-xadc-core.c b/drivers/iio/adc/xilinx-xadc-core.c
> index 6fa629b..ce93bd8 100644
> --- a/drivers/iio/adc/xilinx-xadc-core.c
> +++ b/drivers/iio/adc/xilinx-xadc-core.c
> @@ -997,7 +997,7 @@ static const struct iio_event_spec xadc_voltage_events[] = {
> .num_event_specs = (_alarm) ? ARRAY_SIZE(xadc_voltage_events) : 0, \
> .scan_index = (_scan_index), \
> .scan_type = { \
> - .sign = 'u', \
> + .sign = ((_addr) == XADC_REG_VREFN) ? 's' : 'u', \
> .realbits = 12, \
> .storagebits = 16, \
> .shift = 4, \
>
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