From: H Hartley Sweeten <hsweeten@visionengravers.com>
Date: Thu, 4 Sep 2014 19:14:18 +0000 (-0700)
Subject: staging: comedi: adl_pci9118: clarify the digital I/O register
X-Git-Tag: fixes-for-v3.18-merge-window~15^2~677
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c7f499bd03aa735d652e086762e48117d2b197b8;p=pandora-kernel.git

staging: comedi: adl_pci9118: clarify the digital I/O register

The same register is used for both the digital inputs and outputs.
Reading the register returns the state of the 4 digtial input channels
and the 4 digital output channels. Writing to the register updates the
digital outputs.

Add some comments to clarify this and use a single define for the register.

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>
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