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staging:iio:ad7780: 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 19:24:37 +0000 (20:24 +0100)
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>

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