diff options
| author | Thomas Betker <thomas.betker@rohde-schwarz.com> | 2015-04-15 21:11:50 +0200 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2015-06-09 14:31:41 -0400 |
| commit | 88ee23a99440e0fc5f4abd3748d647486ff93c4f (patch) | |
| tree | 2701f91ba6daa6792d5e05fdb6c2bd367539d1e5 | |
| parent | 3ec936bcf36f91348c08366ebd15d3241298d64f (diff) | |
iio: adc: xilinx: Fix VREFN sign
[ Upstream commit 97ffae1d30c3f6ceee67d5b0d3e540c08c13c744 ]
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>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
| -rw-r--r-- | drivers/iio/adc/xilinx-xadc-core.c | 2 |
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, \ |