From: Ian Abbott <abbotti@mev.co.uk>
Date: Mon, 21 Jul 2014 16:29:05 +0000 (+0100)
Subject: staging: comedi: ni_6527: support INSN_CONFIG_DIGITAL_TRIG
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~166^2~339
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=110f9e687c1a8490383612817ac03f4b29861da1;p=pandora-kernel.git

staging: comedi: ni_6527: support INSN_CONFIG_DIGITAL_TRIG

The "edge detection interrupt" subdevice supports the
`INSN_CONFIG_CHANGE_NOTIFY` comedi instruction which is only supported
by one other driver.  The `INSN_CONFIG_DIGITAL_TRIG` comedi instruction
is more flexible as it supports both edge and level detection, but is
not currently supported by this driver.

Add partial support for `INSN_CONFIG_DIGITAL_TRIG`, but only for edge
detection.  Make use of the `ni6527_set_edge_detection()` used for
`INSN_CONFIG_CHANGE_NOTIFY`, but add a parameter holding a mask of the
rising and falling edges to be updated and preserve the unmasked edges
when updating.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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