diff options
| author | Thomas Betker <thomas.betker@rohde-schwarz.com> | 2015-04-15 21:11:50 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-06-06 08:20:55 -0700 |
| commit | e8deb37e331584ba923eef712183b0ed75a6683f (patch) | |
| tree | ab8777ddc80eaf993704278e9f96569204938657 /drivers | |
| parent | 0f8fc8090cce910c25c521b7cfa307c97f644e86 (diff) | |
iio: adc: xilinx: Fix VREFN sign
commit 97ffae1d30c3f6ceee67d5b0d3e540c08c13c744 upstream.
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>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -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, \ |