staging: comedi: adv_pci1710: refactor boardinfo 'cardtype'

The 'cardtype' in the boardinfo is only used to:

 1) determine if the board is a pci1720 during the attach of the driver
    and when reseting the board
 2) determine is the board is not a pci1713 when checking for analog input
    data dropout

There is also an unnecessary use of the 'cardtype' when canceling an analog
input async command.

Remove the 'cardtype' member and add two bit-field flags, 'is_pci1713' and
'is_pci1720'. Refactor the driver to use the new flags.

Remove the unnecessary cardtype handling in pci171x_ai_cancel().

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/adv_pci1710.c

@@ -51,11 +51,6 @@ Configuration options:
 #include "8253.h"
 #include "amcc_s5933.h"
 
-/* hardware types of the cards */
-#define TYPE_PCI171X	0
-#define TYPE_PCI1713	2
-#define TYPE_PCI1720	3
-
 #define PCI171x_AD_DATA	 0	/* R:   A/D data */
 #define PCI171x_SOFTTRG	 0	/* W:   soft trigger for A/D */
 #define PCI171x_RANGE	 2	/* W:   A/D gain/range register */
@@ -191,10 +186,11 @@ enum pci1710_boardid {
 
 struct boardtype {
 	const char *name;	/*  board name */
-	char cardtype;		/*  0=1710& co. 2=1713, ... */
 	int n_aichan;		/*  num of A/D chans */
 	const struct comedi_lrange *rangelist_ai;	/*  rangelist for A/D */
 	const char *rangecode_ai;	/*  range codes for programming */
+	unsigned int is_pci1713:1;
+	unsigned int is_pci1720:1;
 	unsigned int has_irq:1;
 	unsigned int has_large_fifo:1;	/* 4K or 1K FIFO */
 	unsigned int has_diff_ai:1;
@@ -206,7 +202,6 @@ struct boardtype {
 static const struct boardtype boardtypes[] = {
 	[BOARD_PCI1710] = {
 		.name		= "pci1710",
-		.cardtype	= TYPE_PCI171X,
 		.n_aichan	= 16,
 		.rangelist_ai	= &range_pci1710_3,
 		.rangecode_ai	= range_codes_pci1710_3,
@@ -219,7 +214,6 @@ static const struct boardtype boardtypes[] = {
 	},
 	[BOARD_PCI1710HG] = {
 		.name		= "pci1710hg",
-		.cardtype	= TYPE_PCI171X,
 		.n_aichan	= 16,
 		.rangelist_ai	= &range_pci1710hg,
 		.rangecode_ai	= range_codes_pci1710hg,
@@ -232,7 +226,6 @@ static const struct boardtype boardtypes[] = {
 	},
 	[BOARD_PCI1711] = {
 		.name		= "pci1711",
-		.cardtype	= TYPE_PCI171X,
 		.n_aichan	= 16,
 		.rangelist_ai	= &range_pci17x1,
 		.rangecode_ai	= range_codes_pci17x1,
@@ -243,22 +236,21 @@ static const struct boardtype boardtypes[] = {
 	},
 	[BOARD_PCI1713] = {
 		.name		= "pci1713",
-		.cardtype	= TYPE_PCI1713,
 		.n_aichan	= 32,
 		.rangelist_ai	= &range_pci1710_3,
 		.rangecode_ai	= range_codes_pci1710_3,
+		.is_pci1713	= 1,
 		.has_irq	= 1,
 		.has_large_fifo	= 1,
 		.has_diff_ai	= 1,
 	},
 	[BOARD_PCI1720] = {
 		.name		= "pci1720",
-		.cardtype	= TYPE_PCI1720,
+		.is_pci1720	= 1,
 		.has_ao		= 1,
 	},
 	[BOARD_PCI1731] = {
 		.name		= "pci1731",
-		.cardtype	= TYPE_PCI171X,
 		.n_aichan	= 16,
 		.rangelist_ai	= &range_pci17x1,
 		.rangecode_ai	= range_codes_pci17x1,
@@ -300,7 +292,7 @@ static int pci171x_ai_dropout(struct comedi_device *dev,
 	const struct boardtype *board = dev->board_ptr;
 	struct pci1710_private *devpriv = dev->private;
 
-	if (board->cardtype != TYPE_PCI1713) {
+	if (!board->is_pci1713) {
 		if ((val & 0xf000) != devpriv->act_chanlist[chan]) {
 			dev_err(dev->class_dev,
 				"A/D data droput: received from channel %d, expected %d\n",
@@ -643,20 +635,15 @@ static int pci1720_ao_insn_write(struct comedi_device *dev,
 static int pci171x_ai_cancel(struct comedi_device *dev,
 			     struct comedi_subdevice *s)
 {
-	const struct boardtype *board = dev->board_ptr;
 	struct pci1710_private *devpriv = dev->private;
 
-	switch (board->cardtype) {
-	default:
-		devpriv->CntrlReg &= Control_CNT0;
-		devpriv->CntrlReg |= Control_SW;
-		/* reset any operations */
-		outw(devpriv->CntrlReg, dev->iobase + PCI171x_CONTROL);
-		pci171x_start_pacer(dev, false);
-		outb(0, dev->iobase + PCI171x_CLRFIFO);
-		outb(0, dev->iobase + PCI171x_CLRINT);
-		break;
-	}
+	devpriv->CntrlReg &= Control_CNT0;
+	devpriv->CntrlReg |= Control_SW;
+	/* reset any operations */
+	outw(devpriv->CntrlReg, dev->iobase + PCI171x_CONTROL);
+	pci171x_start_pacer(dev, false);
+	outb(0, dev->iobase + PCI171x_CLRFIFO);
+	outb(0, dev->iobase + PCI171x_CLRINT);
 
 	return 0;
 }
@@ -982,12 +969,10 @@ static int pci1710_reset(struct comedi_device *dev)
 {
 	const struct boardtype *board = dev->board_ptr;
 
-	switch (board->cardtype) {
-	case TYPE_PCI1720:
+	if (board->is_pci1720)
 		return pci1720_reset(dev);
-	default:
-		return pci171x_reset(dev);
-	}
+
+	return pci171x_reset(dev);
 }
 
 static int pci1710_auto_attach(struct comedi_device *dev,
@@ -1066,25 +1051,22 @@ static int pci1710_auto_attach(struct comedi_device *dev,
 		s->type		= COMEDI_SUBD_AO;
 		s->subdev_flags	= SDF_WRITABLE | SDF_GROUND | SDF_COMMON;
 		s->maxdata	= 0x0fff;
-		switch (board->cardtype) {
-		case TYPE_PCI1720:
+		if (board->is_pci1720) {
 			s->n_chan	= 4;
 			s->range_table	= &pci1720_ao_range;
 			s->insn_write	= pci1720_ao_insn_write;
-			break;
-		default:
+		} else {
 			s->n_chan	= 2;
 			s->range_table	= &pci171x_ao_range;
 			s->insn_write	= pci171x_ao_insn_write;
-			break;
 		}
 
 		ret = comedi_alloc_subdev_readback(s);
 		if (ret)
 			return ret;
 
 		/* initialize the readback values to match the board reset */
-		if (board->cardtype == TYPE_PCI1720) {
+		if (board->is_pci1720) {
 			int i;
 
 			for (i = 0; i < s->n_chan; i++)