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staging: comedi: das16: introduce das16_isadma_disable()
authorH Hartley Sweeten <hsweeten@visionengravers.com>
Tue, 13 Jan 2015 17:16:32 +0000 (10:16 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sat, 17 Jan 2015 22:31:30 +0000 (14:31 -0800)
Introduce a helper function to disable and the ISA DMA controller and
return the residue as described in Documentation/DMA-ISA-LPC.txt.

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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