From: H Hartley Sweeten <hartleys@visionengravers.com>
Date: Tue, 11 Sep 2012 17:47:08 +0000 (-0700)
Subject: staging: comedi: comedi_fc: introduce cfc_check_trigger_src
X-Git-Tag: omap-for-v3.7-rc1/fixes-cpufreq-signed~75^2~362
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=43b9778eeb789fbfad3ce66da3bbb3440440fbb8;p=pandora-kernel.git

staging: comedi: comedi_fc: introduce cfc_check_trigger_src

All of the comedi drivers that support the 'cmd' callback also
require a 'do_cmdtest' callback. The do_cmdtest validates the
comedi_cmd before it is executed.

"Step 1" of each do_cmdtest does a trivial validation of the
trigger sources by doing something like this for each trigger:

	int err = 0;
	unsigned int tmp;

	tmp = cmd->start_src;
	src &= TRIG_NOW;
	if (!src || tmp != src)
		err++;
	/* Test the remaining triggers similarly */

	if (err)
		return 1;

Introduce a helper function in comedi_fc to handle this boilerplate.
The drivers can then just do:

	err |= cfc_check_trigger_src(&cmd->start_src, TRIG_NOW);
	/* Test the remaining triggers similarly */

	if (err)
		return 1;

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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