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staging: comedi: pcl816: introduce pcl816_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 11:30:07 -07:00
committed by Greg Kroah-Hartman
parent 9fdef9c84a
commit 939d33d688
1 changed files with 8 additions and 3 deletions
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11
drivers/staging/comedi/drivers/pcl816.c
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@@ -214,6 +214,12 @@ static void pcl816_ai_clear_eoc(struct comedi_device *dev)
outb(0, dev->iobase + PCL816_CLRINT);
}
static void pcl816_ai_soft_trig(struct comedi_device *dev)
{
/* writing any value triggers a software conversion */
outb(0, dev->iobase + PCL816_AD_LO);
}
static unsigned int pcl816_ai_get_sample(struct comedi_device *dev,
struct comedi_subdevice *s)
{
@@ -508,7 +514,7 @@ static int pcl816_ai_cancel(struct comedi_device *dev,
i8254_set_mode(dev->iobase + PCL816_TIMER_BASE, 0,
1, I8254_MODE0 | I8254_BINARY);
outb(0, dev->iobase + PCL816_AD_LO);
pcl816_ai_soft_trig(dev);
pcl816_ai_get_sample(dev, s);
pcl816_ai_clear_eoc(dev);
@@ -619,8 +625,7 @@ static int pcl816_ai_insn_read(struct comedi_device *dev,
for (i = 0; i < insn->n; i++) {
pcl816_ai_clear_eoc(dev);
/* start conversion */
outb(0, dev->iobase + PCL816_AD_LO);
pcl816_ai_soft_trig(dev);
ret = comedi_timeout(dev, s, insn, pcl816_ai_eoc, 0);
if (ret)