staging: comedi: dt282x: remove the 'opt_*' enum

This enum is used to index the 'options' values that are passed
by the user attaches to the driver. These options are identified
in the comedi comment block.

For aesthetics, remove the enum and just open code the index values.

Refactor the Analog Input subdevice init so that the it->options[4],
indicating differential inputs, does not have to be checked multiple
times.
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/dt282x.c

@@ -1079,13 +1079,6 @@ static const struct comedi_lrange *opt_ao_range_lkup(int x)
 	return ao_range_table[x];
 }
 
-enum {  /* i/o base, irq, dma channels */
-	opt_iobase = 0, opt_irq, opt_dma1, opt_dma2,
-	opt_diff,		/* differential */
-	opt_ai_twos, opt_ao0_twos, opt_ao1_twos,	/* twos comp */
-	opt_ai_range, opt_ao0_range, opt_ao1_range,	/* range */
-};
-
 static int dt282x_grab_dma(struct comedi_device *dev, int dma1, int dma2)
 {
 	struct dt282x_private *devpriv = dev->private;
@@ -1183,11 +1176,10 @@ static int dt282x_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 		return -ENOMEM;
 
 	/* an IRQ and 2 DMA channels are required for async command support */
-	if (it->options[opt_irq] &&
-	    it->options[opt_dma1] && it->options[opt_dma2]) {
-		unsigned int irq = it->options[opt_irq];
-		unsigned int dma1 = it->options[opt_dma1];
-		unsigned int dma2 = it->options[opt_dma2];
+	if (it->options[1] && it->options[2] && it->options[3]) {
+		unsigned int irq = it->options[1];
+		unsigned int dma1 = it->options[2];
+		unsigned int dma2 = it->options[3];
 
 		if (dma2 < dma1) {
 			unsigned int swap;
@@ -1223,15 +1215,18 @@ static int dt282x_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 
 	/* ai subdevice */
 	s->type = COMEDI_SUBD_AI;
-	s->subdev_flags = SDF_READABLE |
-	    ((it->options[opt_diff]) ? SDF_DIFF : SDF_COMMON);
-	s->n_chan =
-	    (it->options[opt_diff]) ? board->adchan_di : board->adchan_se;
+	s->subdev_flags = SDF_READABLE;
+	if (it->options[4]) {
+		s->subdev_flags	|= SDF_DIFF;
+		s->n_chan	= board->adchan_di;
+	} else {
+		s->subdev_flags	|= SDF_COMMON;
+		s->n_chan	= board->adchan_se;
+	}
 	s->insn_read = dt282x_ai_insn_read;
 	s->maxdata = board->ai_maxdata;
-	s->range_table =
-	    opt_ai_range_lkup(board->ispgl, it->options[opt_ai_range]);
-	devpriv->ad_2scomp = it->options[opt_ai_twos] ? 1 : 0;
+	s->range_table = opt_ai_range_lkup(board->ispgl, it->options[8]);
+	devpriv->ad_2scomp = it->options[5] ? 1 : 0;
 	if (dev->irq) {
 		dev->read_subdev = s;
 		s->subdev_flags |= SDF_CMD_READ;
@@ -1252,12 +1247,10 @@ static int dt282x_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 		s->insn_write = dt282x_ao_insn_write;
 		s->maxdata = board->ao_maxdata;
 		s->range_table_list = devpriv->darangelist;
-		devpriv->darangelist[0] =
-		    opt_ao_range_lkup(it->options[opt_ao0_range]);
-		devpriv->darangelist[1] =
-		    opt_ao_range_lkup(it->options[opt_ao1_range]);
-		devpriv->da0_2scomp = it->options[opt_ao0_twos] ? 1 : 0;
-		devpriv->da1_2scomp = it->options[opt_ao1_twos] ? 1 : 0;
+		devpriv->darangelist[0] = opt_ao_range_lkup(it->options[9]);
+		devpriv->darangelist[1] = opt_ao_range_lkup(it->options[10]);
+		devpriv->da0_2scomp = it->options[6] ? 1 : 0;
+		devpriv->da1_2scomp = it->options[7] ? 1 : 0;
 		if (dev->irq) {
 			dev->write_subdev = s;
 			s->subdev_flags |= SDF_CMD_WRITE;