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staging: comedi: pcl812: introduce pcl812_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 11:30:08 -07:00 • committed by Greg Kroah-Hartman
parent 939d33d688
commit 1e66bb255e
1 changed files with 7 additions and 2 deletions
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9
drivers/staging/comedi/drivers/pcl812.c
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@ -643,6 +643,12 @@ static void pcl812_ai_clear_eoc(struct comedi_device *dev)
outb(0, dev->iobase + PCL812_CLRINT); outb(0, dev->iobase + PCL812_CLRINT);
} }
static void pcl812_ai_soft_trig(struct comedi_device *dev)
{
/* writing any value triggers a software conversion */
outb(255, dev->iobase + PCL812_SOFTTRIG);
}
static unsigned int pcl812_ai_get_sample(struct comedi_device *dev, static unsigned int pcl812_ai_get_sample(struct comedi_device *dev,
struct comedi_subdevice *s) struct comedi_subdevice *s)
{ {
@ -1028,8 +1034,7 @@ static int pcl812_ai_insn_read(struct comedi_device *dev,
for (i = 0; i < insn->n; i++) { for (i = 0; i < insn->n; i++) {
pcl812_ai_clear_eoc(dev); pcl812_ai_clear_eoc(dev);
/* start conversion */ pcl812_ai_soft_trig(dev);
outb(255, dev->iobase + PCL812_SOFTTRIG);
ret = comedi_timeout(dev, s, insn, pcl812_ai_eoc, 0); ret = comedi_timeout(dev, s, insn, pcl812_ai_eoc, 0);
if (ret) if (ret)