staging: comedi: gsc_hpdi: tidy up hpdi_cmd_test()

For aesthetics, rename this function so it has namespace associated
with the driver and move it so that it is not in the middle of the
interrupt support code.

Absorb the di_cmd_test() helper and tidy up the function a bit.
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>

drivers/staging/comedi/drivers/gsc_hpdi.c

@@ -218,87 +218,6 @@ static void disable_plx_interrupts(struct comedi_device *dev)
 	writel(0, devpriv->plx9080_iobase + PLX_INTRCS_REG);
 }
 
-static int di_cmd_test(struct comedi_device *dev, struct comedi_subdevice *s,
-		       struct comedi_cmd *cmd)
-{
-	int err = 0;
-	int i;
-
-	/* Step 1 : check if triggers are trivially valid */
-
-	err |= cfc_check_trigger_src(&cmd->start_src, TRIG_NOW);
-	err |= cfc_check_trigger_src(&cmd->scan_begin_src, TRIG_EXT);
-	err |= cfc_check_trigger_src(&cmd->convert_src, TRIG_NOW);
-	err |= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
-	err |= cfc_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
-
-	if (err)
-		return 1;
-
-	/* Step 2a : make sure trigger sources are unique */
-
-	err |= cfc_check_trigger_is_unique(cmd->stop_src);
-
-	/* Step 2b : and mutually compatible */
-
-	if (err)
-		return 2;
-
-	/* Step 3: check if arguments are trivially valid */
-
-	if (!cmd->chanlist_len) {
-		cmd->chanlist_len = 32;
-		err |= -EINVAL;
-	}
-	err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
-
-	switch (cmd->stop_src) {
-	case TRIG_COUNT:
-		err |= cfc_check_trigger_arg_min(&cmd->stop_arg, 1);
-		break;
-	case TRIG_NONE:
-		err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
-		break;
-	default:
-		break;
-	}
-
-	if (err)
-		return 3;
-
-	/* step 4: fix up any arguments */
-
-	if (err)
-		return 4;
-
-	if (!cmd->chanlist)
-		return 0;
-
-	for (i = 1; i < cmd->chanlist_len; i++) {
-		if (CR_CHAN(cmd->chanlist[i]) != i) {
-			/*  XXX could support 8 or 16 channels */
-			comedi_error(dev,
-				     "chanlist must be ch 0 to 31 in order");
-			err++;
-			break;
-		}
-	}
-
-	if (err)
-		return 5;
-
-	return 0;
-}
-
-static int hpdi_cmd_test(struct comedi_device *dev, struct comedi_subdevice *s,
-			 struct comedi_cmd *cmd)
-{
-	if (s->io_bits)
-		return -EINVAL;
-	else
-		return di_cmd_test(dev, s, cmd);
-}
-
 static inline void hpdi_writel(struct comedi_device *dev, uint32_t bits,
 			       unsigned int offset)
 {
@@ -505,6 +424,76 @@ static int gsc_hpdi_cmd(struct comedi_device *dev,
 	return 0;
 }
 
+static int gsc_hpdi_cmd_test(struct comedi_device *dev,
+			     struct comedi_subdevice *s,
+			     struct comedi_cmd *cmd)
+{
+	int err = 0;
+	int i;
+
+	if (s->io_bits)
+		return -EINVAL;
+
+	/* Step 1 : check if triggers are trivially valid */
+
+	err |= cfc_check_trigger_src(&cmd->start_src, TRIG_NOW);
+	err |= cfc_check_trigger_src(&cmd->scan_begin_src, TRIG_EXT);
+	err |= cfc_check_trigger_src(&cmd->convert_src, TRIG_NOW);
+	err |= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
+	err |= cfc_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
+
+	if (err)
+		return 1;
+
+	/* Step 2a : make sure trigger sources are unique */
+
+	err |= cfc_check_trigger_is_unique(cmd->stop_src);
+
+	/* Step 2b : and mutually compatible */
+
+	if (err)
+		return 2;
+
+	/* Step 3: check if arguments are trivially valid */
+
+	if (!cmd->chanlist_len || !cmd->chanlist) {
+		cmd->chanlist_len = 32;
+		err |= -EINVAL;
+	}
+	err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
+
+	if (cmd->stop_src == TRIG_COUNT)
+		err |= cfc_check_trigger_arg_min(&cmd->stop_arg, 1);
+	else	/* TRIG_NONE */
+		err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
+
+	if (err)
+		return 3;
+
+	/* step 4: fix up any arguments */
+
+	if (err)
+		return 4;
+
+	/* step 5: complain about special chanlist considerations */
+
+	for (i = 0; i < cmd->chanlist_len; i++) {
+		if (CR_CHAN(cmd->chanlist[i]) != i) {
+			/*  XXX could support 8 or 16 channels */
+			dev_err(dev->class_dev,
+				"chanlist must be ch 0 to 31 in order");
+			err |= -EINVAL;
+			break;
+		}
+	}
+
+	if (err)
+		return 5;
+
+	return 0;
+
+}
+
 /* setup dma descriptors so a link completes every 'len' bytes */
 static int gsc_hpdi_setup_dma_descriptors(struct comedi_device *dev,
 					  unsigned int len)
@@ -739,7 +728,7 @@ static int hpdi_auto_attach(struct comedi_device *dev,
 	s->range_table	= &range_digital;
 	s->insn_config	= gsc_hpdi_dio_insn_config;
 	s->do_cmd	= gsc_hpdi_cmd;
-	s->do_cmdtest	= hpdi_cmd_test;
+	s->do_cmdtest	= gsc_hpdi_cmd_test;
 	s->cancel	= hpdi_cancel;
 
 	return init_hpdi(dev);