The values reported by the AD7793 are unsigned.
In uniploar mode:
0x000000 is zeroscale
0xffffff is fullscale
In bipolar mode:
0x000000 is negative fullscale
0x800000 is zeroscale
0xffffff is positive fullscale
In bipolar mode there is a binary offset, but the values are still unsigned.
Signed-off-by: Lars-Peter Clausen <lars@xxxxxxxxxx>
---
drivers/staging/iio/adc/ad7192.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/staging/iio/adc/ad7192.c b/drivers/staging/iio/adc/ad7192.c
index 5565268..b103f58 100644
--- a/drivers/staging/iio/adc/ad7192.c
+++ b/drivers/staging/iio/adc/ad7192.c
@@ -945,7 +945,7 @@ static const struct iio_info ad7195_info = {
IIO_CHAN_INFO_SCALE_SHARED_BIT, \
.address = _address, \
.scan_index = _si, \
- .scan_type = IIO_ST('s', 24, 32, 0)}
+ .scan_type = IIO_ST('u', 24, 32, 0)}
#define AD7192_CHAN(_chan, _address, _si) \
{ .type = IIO_VOLTAGE, \
@@ -955,7 +955,7 @@ static const struct iio_info ad7195_info = {
IIO_CHAN_INFO_SCALE_SHARED_BIT, \
.address = _address, \
.scan_index = _si, \
- .scan_type = IIO_ST('s', 24, 32, 0)}
+ .scan_type = IIO_ST('u', 24, 32, 0)}
#define AD7192_CHAN_TEMP(_chan, _address, _si) \
{ .type = IIO_TEMP, \
@@ -965,7 +965,7 @@ static const struct iio_info ad7195_info = {
IIO_CHAN_INFO_SCALE_SEPARATE_BIT, \
.address = _address, \
.scan_index = _si, \
- .scan_type = IIO_ST('s', 24, 32, 0)}
+ .scan_type = IIO_ST('u', 24, 32, 0)}
static const struct iio_chan_spec ad7192_channels[] = {
AD7192_CHAN_DIFF(1, 2, NULL, AD7192_CH_AIN1P_AIN2M, 0),
--
1.7.10.4
--
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