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iio: adc: xilinx: Fix VREFN sign

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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@rohde-schwarz.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Thomas Betker 2015-04-15 21:11:50 +02:00 committed by Jonathan Cameron
parent 00db4e52f4
commit 97ffae1d30
1 changed files with 1 additions and 1 deletions
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drivers/iio/adc/xilinx-xadc-core.c
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@ -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, \