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staging: comedi: quatech_daqp_cs: ai async command requires a pacer

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The ai (*do_cmd) assumes that either the convert_src is TRIG_TIMER or
the scan_begin_src is TRIG_TIMER and always programs the pacer clock
with the appropriate trigger argument.

Add a Step 2b check to the (*do_cmdtest) to ensure that at least one
of the triggers is TRIG_TIMER.

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>
This commit is contained in:
H Hartley Sweeten 2015-10-05 14:23:10 -07:00 • committed by Greg Kroah-Hartman
commit 0d77ef8b43
1 changed files with 4 additions and 0 deletions
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4
drivers/staging/comedi/drivers/quatech_daqp_cs.c
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@ -394,6 +394,10 @@ static int daqp_ai_cmdtest(struct comedi_device *dev,
/* Step 2b : and mutually compatible */
/* the async command requires a pacer */
if (cmd->scan_begin_src != TRIG_TIMER && cmd->convert_src != TRIG_TIMER)
err |= -EINVAL;
if (err)
return 2;