The core will validate the insn->n value based on the actual instruction
(data[0]) that is being handled. Remove the sanity check and change the
instruction handling into a switch. This follows the normal format for
(*insn_config) functions and make adding additional instructions easier.
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/ni_6527.c | 38 ++++++++++++++++++--------------
1 file changed, 21 insertions(+), 17 deletions(-)
diff --git a/drivers/staging/comedi/drivers/ni_6527.c
b/drivers/staging/comedi/drivers/ni_6527.c
index dc22f9f..65a1ba9 100644
--- a/drivers/staging/comedi/drivers/ni_6527.c
+++ b/drivers/staging/comedi/drivers/ni_6527.c
@@ -123,32 +123,36 @@ static void ni6527_set_filter_enable(struct comedi_device
*dev,
static int ni6527_di_insn_config(struct comedi_device *dev,
struct comedi_subdevice *s,
- struct comedi_insn *insn, unsigned int *data)
+ struct comedi_insn *insn,
+ unsigned int *data)
{
struct ni6527_private *devpriv = dev->private;
- int chan = CR_CHAN(insn->chanspec);
+ unsigned int chan = CR_CHAN(insn->chanspec);
unsigned int interval;
- if (insn->n != 2)
- return -EINVAL;
-
- if (data[0] != INSN_CONFIG_FILTER)
- return -EINVAL;
-
- if (data[1]) {
+ switch (data[0]) {
+ case INSN_CONFIG_FILTER:
+ /*
+ * The deglitch filter interval is specified in nanoseconds.
+ * The hardware supports intervals in 200ns increments. Round
+ * the user values up and return the actual interval.
+ */
interval = (data[1] + 100) / 200;
data[1] = interval * 200;
- ni6527_set_filter_interval(dev, interval);
-
- devpriv->filter_enable |= 1 << chan;
- } else {
- devpriv->filter_enable &= ~(1 << chan);
+ if (interval) {
+ ni6527_set_filter_interval(dev, interval);
+ devpriv->filter_enable |= 1 << chan;
+ } else {
+ devpriv->filter_enable &= ~(1 << chan);
+ }
+ ni6527_set_filter_enable(dev, devpriv->filter_enable);
+ break;
+ default:
+ return -EINVAL;
}
- ni6527_set_filter_enable(dev, devpriv->filter_enable);
-
- return 2;
+ return insn->n;
}
static int ni6527_di_insn_bits(struct comedi_device *dev,
--
1.8.3.2
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