staging:iio:ad7291 define alert register bits
staging:iio:ad7291 define alert register bits

Define some names for alert register bits and apply them to
ad7291_event_handler().

Signed-off-by: Hartmut Knaack <4bccb8448924141fc676c25eb657b52ee47a361d@gmx.de>
Acked-by: Lars-Peter Clausen <3318dc5ce3e4fb7c28a0b841b6801c884e1d0896@metafoo.de>
Signed-off-by: Jonathan Cameron <09f65b71b7655725897b2fd41a09a0cefe2e1ace@kernel.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs