Use comedi_timeout() to wait for the analog input end-of-conversion.
Also, remove some unnecessary comments.
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/dyna_pci10xx.c | 40 ++++++++++++++++-----------
1 file changed, 24 insertions(+), 16 deletions(-)
diff --git a/drivers/staging/comedi/drivers/dyna_pci10xx.c
b/drivers/staging/comedi/drivers/dyna_pci10xx.c
index 6915732..6d03b8f 100644
--- a/drivers/staging/comedi/drivers/dyna_pci10xx.c
+++ b/drivers/staging/comedi/drivers/dyna_pci10xx.c
@@ -57,18 +57,27 @@ struct dyna_pci10xx_private {
unsigned long BADR3;
};
-/******************************************************************************/
-/************************** READ WRITE FUNCTIONS
******************************/
-/******************************************************************************/
+static int dyna_pci10xx_ai_eoc(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn,
+ unsigned long context)
+{
+ unsigned int status;
+
+ status = inw_p(dev->iobase);
+ if (status & (1 << 15))
+ return 0;
+ return -EBUSY;
+}
-/* analog input callback */
static int dyna_pci10xx_insn_read_ai(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
struct dyna_pci10xx_private *devpriv = dev->private;
- int n, counter;
+ int n;
u16 d = 0;
+ int ret = 0;
unsigned int chan, range;
/* get the channel number and range */
@@ -82,18 +91,17 @@ static int dyna_pci10xx_insn_read_ai(struct comedi_device
*dev,
smp_mb();
outw_p(0x0000 + range + chan, dev->iobase + 2);
udelay(10);
- /* read data */
- for (counter = 0; counter < READ_TIMEOUT; counter++) {
- d = inw_p(dev->iobase);
- /* check if read is successful if the EOC bit is set */
- if (d & (1 << 15))
- goto conv_finish;
+ ret = comedi_timeout(dev, s, insn, dyna_pci10xx_ai_eoc, 0);
+ if (ret) {
+ data[n] = 0;
+ dev_dbg(dev->class_dev,
+ "timeout reading analog input\n");
+ break;
}
- data[n] = 0;
- dev_dbg(dev->class_dev, "timeout reading analog input\n");
- continue;
-conv_finish:
+
+ /* read data */
+ d = inw_p(dev->iobase);
/* mask the first 4 bits - EOC bits */
d &= 0x0FFF;
data[n] = d;
@@ -101,7 +109,7 @@ conv_finish:
mutex_unlock(&devpriv->mutex);
/* return the number of samples read/written */
- return n;
+ return ret ? ret : n;
}
/* analog output callback */
--
1.8.5.2
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