[PATCH 41/87] staging: comedi: pcl816: introduce pcl816_ai_get_sample()
H Hartley Sweeten
hsweeten at visionengravers.com
Mon Feb 17 21:27:15 UTC 2014
Introduce a helper function to read the 14/16-bit analog input data
sample.
Signed-off-by: H Hartley Sweeten <hsweeten at visionengravers.com>
Cc: Ian Abbott <abbotti at mev.co.uk>
Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
drivers/staging/comedi/drivers/pcl816.c | 26 +++++++++++++++-----------
1 file changed, 15 insertions(+), 11 deletions(-)
diff --git a/drivers/staging/comedi/drivers/pcl816.c b/drivers/staging/comedi/drivers/pcl816.c
index 0337a13..fde0989 100644
--- a/drivers/staging/comedi/drivers/pcl816.c
+++ b/drivers/staging/comedi/drivers/pcl816.c
@@ -153,6 +153,17 @@ static int pcl816_ai_cmdtest(struct comedi_device *dev,
struct comedi_cmd *cmd);
static int pcl816_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s);
+static unsigned int pcl816_ai_get_sample(struct comedi_device *dev,
+ struct comedi_subdevice *s)
+{
+ unsigned int val;
+
+ val = inb(dev->iobase + PCL816_AD_HI) << 8;
+ val |= inb(dev->iobase + PCL816_AD_LO);
+
+ return val & s->maxdata;
+}
+
static int pcl816_ai_eoc(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
@@ -194,9 +205,8 @@ static int pcl816_ai_insn_read(struct comedi_device *dev,
return ret;
}
- /* return read value */
- data[n] = ((inb(dev->iobase + PCL816_AD_HI) << 8) |
- (inb(dev->iobase + PCL816_AD_LO)));
+ data[n] = pcl816_ai_get_sample(dev, s);
+
/* clear INT (conversion end) flag */
outb(0, dev->iobase + PCL816_CLRINT);
}
@@ -213,7 +223,6 @@ static irqreturn_t interrupt_pcl816_ai_mode13_int(int irq, void *d)
struct comedi_device *dev = d;
struct pcl816_private *devpriv = dev->private;
struct comedi_subdevice *s = dev->read_subdev;
- unsigned char low, hi;
int timeout = 50; /* wait max 50us */
while (timeout--) {
@@ -232,11 +241,7 @@ static irqreturn_t interrupt_pcl816_ai_mode13_int(int irq, void *d)
}
- /* get the sample */
- low = inb(dev->iobase + PCL816_AD_LO);
- hi = inb(dev->iobase + PCL816_AD_HI);
-
- comedi_buf_put(s->async, (hi << 8) | low);
+ comedi_buf_put(s->async, pcl816_ai_get_sample(dev, s));
outb(0, dev->iobase + PCL816_CLRINT); /* clear INT request */
@@ -640,8 +645,7 @@ static int pcl816_ai_cancel(struct comedi_device *dev,
outb(0xb0, dev->iobase + PCL816_CTRCTL);
outb(0x70, dev->iobase + PCL816_CTRCTL);
outb(0, dev->iobase + PCL816_AD_LO);
- inb(dev->iobase + PCL816_AD_LO);
- inb(dev->iobase + PCL816_AD_HI);
+ pcl816_ai_get_sample(dev, s);
/* clear INT request */
outb(0, dev->iobase + PCL816_CLRINT);
--
1.8.5.2
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