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authorThomas Betker <thomas.betker@rohde-schwarz.com>2015-04-15 21:11:50 +0200
committerJonathan Cameron <jic23@kernel.org>2015-04-19 14:49:54 +0200
commit97ffae1d30c3f6ceee67d5b0d3e540c08c13c744 (patch)
tree43e5f8d6be608c740b89a2a7c4745e22059231c5
parentiio: adc: xilinx: Fix VREFP scale (diff)
downloadlinux-97ffae1d30c3f6ceee67d5b0d3e540c08c13c744.tar.xz
linux-97ffae1d30c3f6ceee67d5b0d3e540c08c13c744.zip
iio: adc: xilinx: Fix VREFN sign
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>
-rw-r--r--drivers/iio/adc/xilinx-xadc-core.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/iio/adc/xilinx-xadc-core.c b/drivers/iio/adc/xilinx-xadc-core.c
index 6fa629b3c168..ce93bd8e3f68 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, \