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staging: comedi: pcl818: introduce pcl818_ai_soft_trig()

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Introduce a helper function to start a software triggered analog input
conversion.

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 2014-03-04 11:30:06 -07:00 • committed by Greg Kroah-Hartman
parent 9fd3effaa7
commit 9fdef9c84a
1 changed files with 7 additions and 3 deletions
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10
drivers/staging/comedi/drivers/pcl818.c
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@ -406,6 +406,11 @@ static void pcl818_ai_clear_eoc(struct comedi_device *dev)
outb(0, dev->iobase + PCL818_CLRINT);
}
static void pcl818_ai_soft_trig(struct comedi_device *dev)
{
/* writing any value triggers a software conversion */
outb(0, dev->iobase + PCL818_AD_LO);
}
static unsigned int pcl818_ai_get_fifo_sample(struct comedi_device *dev,
struct comedi_subdevice *s,
@ -915,7 +920,7 @@ static int pcl818_ai_cancel(struct comedi_device *dev,
dev->iobase + PCL818_CONTROL); /* Stop A/D */
udelay(1);
pcl818_start_pacer(dev, false);
outb(0, dev->iobase + PCL818_AD_LO);
pcl818_ai_soft_trig(dev);
pcl818_ai_get_sample(dev, s, NULL);
outb(0, dev->iobase + PCL818_CONTROL); /* Stop A/D */
pcl818_ai_clear_eoc(dev);
@ -951,8 +956,7 @@ static int pcl818_ai_insn_read(struct comedi_device *dev,
for (i = 0; i < insn->n; i++) {
pcl818_ai_clear_eoc(dev);
/* start conversion */
outb(0, dev->iobase + PCL818_AD_LO);
pcl818_ai_soft_trig(dev);
ret = comedi_timeout(dev, s, insn, pcl818_ai_eoc, 0);
if (ret)