Introduce a helper function to start a software triggered analog input
conversion.
Signed-off-by: H Hartley Sweeten <hswee...@visionengravers.com>
Cc: Ian Abbott <abbo...@mev.co.uk>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/staging/comedi/drivers/pcl818.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/drivers/staging/comedi/drivers/pcl818.c
b/drivers/staging/comedi/drivers/pcl818.c
index 33a78ad..ab2e6f2 100644
--- a/drivers/staging/comedi/drivers/pcl818.c
+++ b/drivers/staging/comedi/drivers/pcl818.c
@@ -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)
--
1.8.5.2
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