staging: comedi: pcl818: introduce pcl818_ai_soft_trig()

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>

diff --git a/drivers/staging/comedi/drivers/pcl818.c b/drivers/staging/comedi/drivers/pcl818.c
index d90c47db5da35e3c88401ea92e275c2141f67bdb..1783b6f6767ed2a41a1c87708e63a04aa217a4c3 100644 (file)
--- 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)