[PATCH 10/49] staging: comedi: das16: factor out step 5 of (*do_cmdtest)

[H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>]

Step 5 of the (*do_cmdtest) validates that the chanlist, chan/range/aref/etc,
is compatible with the actual hardware. At this point in the (*do_cmdtest)
the chanlist is valid, due to checks in the core, so the sanity check is not
needed.

For aesthetics, factor the step 5 code into a helper functions. Tidy up the
factored out code.

Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Cc: Ian Abbott <abbotti@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/staging/comedi/drivers/das16.c | 50 +++++++++++++++++++++-------------
 1 file changed, 31 insertions(+), 19 deletions(-)

diff --git a/drivers/staging/comedi/drivers/das16.c b/drivers/staging/comedi/drivers/das16.c
index 6a7d652..f8cae95 100644
--- a/drivers/staging/comedi/drivers/das16.c
+++ b/drivers/staging/comedi/drivers/das16.c
@@ -600,13 +600,39 @@ static void das16_timer_interrupt(unsigned long arg)
 		mod_timer(&devpriv->timer, jiffies + timer_period());
 }
 
+static int das16_ai_check_chanlist(struct comedi_device *dev,
+				   struct comedi_subdevice *s,
+				   struct comedi_cmd *cmd)
+{
+	unsigned int chan0 = CR_CHAN(cmd->chanlist[0]);
+	unsigned int range0 = CR_RANGE(cmd->chanlist[0]);
+	int i;
+
+	for (i = 1; i < cmd->chanlist_len; i++) {
+		unsigned int chan = CR_CHAN(cmd->chanlist[i]);
+		unsigned int range = CR_RANGE(cmd->chanlist[i]);
+
+		if (chan != (chan0 + i) % s->n_chan) {
+			dev_err(dev->class_dev,
+				"chanlist must be consecutive channels, counting upwards\n");
+			return -EINVAL;
+		}
+
+		if (range != range0) {
+			dev_err(dev->class_dev,
+				"chanlist must all have the same range\n");
+			return -EINVAL;
+		}
+	}
+	return 0;
+}
+
 static int das16_cmd_test(struct comedi_device *dev, struct comedi_subdevice *s,
 			  struct comedi_cmd *cmd)
 {
 	const struct das16_board *board = comedi_board(dev);
 	struct das16_private_struct *devpriv = dev->private;
 	int err = 0, tmp;
-	int gain, start_chan, i;
 	int mask;
 
 	/* Step 1 : check if triggers are trivially valid */
@@ -693,24 +719,10 @@ static int das16_cmd_test(struct comedi_device *dev, struct comedi_subdevice *s,
 	if (err)
 		return 4;
 
-	/*  check channel/gain list against card's limitations */
-	if (cmd->chanlist) {
-		gain = CR_RANGE(cmd->chanlist[0]);
-		start_chan = CR_CHAN(cmd->chanlist[0]);
-		for (i = 1; i < cmd->chanlist_len; i++) {
-			if (CR_CHAN(cmd->chanlist[i]) !=
-			    (start_chan + i) % s->n_chan) {
-				dev_err(dev->class_dev,
-					"entries in chanlist must be consecutive channels, counting upwards\n");
-				err++;
-			}
-			if (CR_RANGE(cmd->chanlist[i]) != gain) {
-				dev_err(dev->class_dev,
-					"entries in chanlist must all have the same gain\n");
-				err++;
-			}
-		}
-	}
+	/* Step 5: check channel list */
+
+	err |= das16_ai_check_chanlist(dev, s, cmd);
+
 	if (err)
 		return 5;
 
-- 
1.8.5.2

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