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staging:iio:ad7793: Mark channels as unsigned
authorLars-Peter Clausen <lars@metafoo.de>
Fri, 10 Aug 2012 16:36:00 +0000 (17:36 +0100)
committerJonathan Cameron <jic23@kernel.org>
Thu, 16 Aug 2012 19:24:34 +0000 (20:24 +0100)
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>
drivers/staging/iio/adc/ad7793.c patch | blob | history

diff --git a/drivers/staging/iio/adc/ad7793.c b/drivers/staging/iio/adc/ad7793.c
index 1d0cd09..5e457a4 100644 (file)
--- a/drivers/staging/iio/adc/ad7793.c
+++ b/drivers/staging/iio/adc/ad7793.c
@@ -722,7 +722,7 @@ static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
                        .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
                        IIO_CHAN_INFO_SCALE_SHARED_BIT,
                        .scan_index = 0,
-                       .scan_type = IIO_ST('s', 24, 32, 0)
+                       .scan_type = IIO_ST('u', 24, 32, 0)
                },
                .channel[1] = {
                        .type = IIO_VOLTAGE,
@@ -734,7 +734,7 @@ static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
                        .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
                        IIO_CHAN_INFO_SCALE_SHARED_BIT,
                        .scan_index = 1,
-                       .scan_type = IIO_ST('s', 24, 32, 0)
+                       .scan_type = IIO_ST('u', 24, 32, 0)
                },
                .channel[2] = {
                        .type = IIO_VOLTAGE,
@@ -746,7 +746,7 @@ static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
                        .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
                        IIO_CHAN_INFO_SCALE_SHARED_BIT,
                        .scan_index = 2,
-                       .scan_type = IIO_ST('s', 24, 32, 0)
+                       .scan_type = IIO_ST('u', 24, 32, 0)
                },
                .channel[3] = {
                        .type = IIO_VOLTAGE,
@@ -759,7 +759,7 @@ static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
                        .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
                        IIO_CHAN_INFO_SCALE_SHARED_BIT,
                        .scan_index = 3,
-                       .scan_type = IIO_ST('s', 24, 32, 0)
+                       .scan_type = IIO_ST('u', 24, 32, 0)
                },
                .channel[4] = {
                        .type = IIO_TEMP,
@@ -769,7 +769,7 @@ static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
                        .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
                        IIO_CHAN_INFO_SCALE_SEPARATE_BIT,
                        .scan_index = 4,
-                       .scan_type = IIO_ST('s', 24, 32, 0),
+                       .scan_type = IIO_ST('u', 24, 32, 0),
                },
                .channel[5] = {
                        .type = IIO_VOLTAGE,
@@ -780,7 +780,7 @@ static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
                        .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
                        IIO_CHAN_INFO_SCALE_SEPARATE_BIT,
                        .scan_index = 5,
-                       .scan_type = IIO_ST('s', 24, 32, 0),
+                       .scan_type = IIO_ST('u', 24, 32, 0),
                },
                .channel[6] = IIO_CHAN_SOFT_TIMESTAMP(6),
        },
@@ -795,7 +795,7 @@ static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
                        .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
                        IIO_CHAN_INFO_SCALE_SHARED_BIT,
                        .scan_index = 0,
-                       .scan_type = IIO_ST('s', 16, 32, 0)
+                       .scan_type = IIO_ST('u', 16, 32, 0)
                },
                .channel[1] = {
                        .type = IIO_VOLTAGE,
@@ -807,7 +807,7 @@ static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
                        .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
                        IIO_CHAN_INFO_SCALE_SHARED_BIT,
                        .scan_index = 1,
-                       .scan_type = IIO_ST('s', 16, 32, 0)
+                       .scan_type = IIO_ST('u', 16, 32, 0)
                },
                .channel[2] = {
                        .type = IIO_VOLTAGE,
@@ -819,7 +819,7 @@ static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
                        .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
                        IIO_CHAN_INFO_SCALE_SHARED_BIT,
                        .scan_index = 2,
-                       .scan_type = IIO_ST('s', 16, 32, 0)
+                       .scan_type = IIO_ST('u', 16, 32, 0)
                },
                .channel[3] = {
                        .type = IIO_VOLTAGE,
@@ -832,7 +832,7 @@ static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
                        .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
                        IIO_CHAN_INFO_SCALE_SHARED_BIT,
                        .scan_index = 3,
-                       .scan_type = IIO_ST('s', 16, 32, 0)
+                       .scan_type = IIO_ST('u', 16, 32, 0)
                },
                .channel[4] = {
                        .type = IIO_TEMP,
@@ -842,7 +842,7 @@ static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
                        .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
                        IIO_CHAN_INFO_SCALE_SEPARATE_BIT,
                        .scan_index = 4,
-                       .scan_type = IIO_ST('s', 16, 32, 0),
+                       .scan_type = IIO_ST('u', 16, 32, 0),
                },
                .channel[5] = {
                        .type = IIO_VOLTAGE,
@@ -853,7 +853,7 @@ static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
                        .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
                        IIO_CHAN_INFO_SCALE_SEPARATE_BIT,
                        .scan_index = 5,
-                       .scan_type = IIO_ST('s', 16, 32, 0),
+                       .scan_type = IIO_ST('u', 16, 32, 0),
                },
                .channel[6] = IIO_CHAN_SOFT_TIMESTAMP(6),
        },
Domain: System / Kernel;