staging: comedi: cb_pcidda: cleanup DADATA define
Rename the define used for the D/A Data register so that is has namespace with this driver. Change the define so that it takes the channel as a parameter to calculate the correct register offset. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Cc: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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