staging:iio:ad7780: Mark channels as unsigned

The values reported by the AD7780 are unsigned with a binary offset:

	0x000000 is negative fullscale
	0x800000 is zeroscale
	0xffffff is positive fullscale

So mark the channel in the channel spec as unsigned rather than signed.

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

1 files changed, 6 insertions, 4 deletions

diff --git a/drivers/staging/iio/adc/ad7780.c b/drivers/staging/iio/adc/ad7780.c
index 1ece2ac8de56..19ee49c95de4 100644
--- a/drivers/staging/iio/adc/ad7780.c
+++ b/drivers/staging/iio/adc/ad7780.c
@@ -131,9 +131,10 @@ static const struct ad7780_chip_info ad7780_chip_info_tbl[] = {
                         .indexed = 1,
                         .channel = 0,
                         .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
-                        IIO_CHAN_INFO_SCALE_SHARED_BIT,
+                        IIO_CHAN_INFO_SCALE_SHARED_BIT |
+                        IIO_CHAN_INFO_OFFSET_SHARED_BIT,
                         .scan_type = {
-                                .sign = 's',
+                                .sign = 'u',
                                 .realbits = 24,
                                 .storagebits = 32,
                                 .shift = 8,
@@ -146,9 +147,10 @@ static const struct ad7780_chip_info ad7780_chip_info_tbl[] = {
                         .indexed = 1,
                         .channel = 0,
                         .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
-                        IIO_CHAN_INFO_SCALE_SHARED_BIT,
+                        IIO_CHAN_INFO_SCALE_SHARED_BIT |
+                        IIO_CHAN_INFO_OFFSET_SHARED_BIT,
                         .scan_type = {
-                                .sign = 's',
+                                .sign = 'u',
                                 .realbits = 20,
                                 .storagebits = 32,
                                 .shift = 12,