staging:iio:ad7192: Mark channels as unsigned

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@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/staging/iio/adc/ad7192.c b/drivers/staging/iio/adc/ad7192.c
index 0a1bc6a..7ba6994 100644 (file)
--- 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 struct iio_chan_spec ad7192_channels[] = {
        AD7192_CHAN_DIFF(1, 2, NULL, AD7192_CH_AIN1P_AIN2M, 0),