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Introduce a helper function to read an analog input sample, check for channel dropout, and mask the sample to the maxdata of the subdevice. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Reviewed-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>