staging: comedi: addi_apci_2200: cleanup digital input subdevice

The board supported by this driver always has a digital input subdevice.
Remove the boardinfo for it and just open-code the relevant data in the
subdevice init.

Remove the SDF_GROUND and SDF_COMMON from the subdevice 'subdev_flags'.
These flags only have meaning for analog input/output subdevices.

Remove the subdevice 'len_chanlist' initialization. This variable only
has meaning for subdevices that support asynchronous commands.

Remove the subdevice 'io_bits' initialization. Digital input subdevices
don't use this variable.

Remove the subdevice function pointers that evaluate to NULL based on the
boardinfo data.

Move the apci2200_di_insn_bits() function from the hwdrv_apci2200.c file
into the main driver file.

For aesthetic reasons, rename the #define used for the register used to
read the digital inputs.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/addi-data/hwdrv_apci2200.c

@@ -51,7 +51,6 @@ You should also find the complete GPL in the COPYING file accompanying this sour
 /* DIGITAL INPUT-OUTPUT DEFINE */
 
 #define APCI2200_DIGITAL_OP		4
-#define APCI2200_DIGITAL_IP		0
 
 /* TIMER COUNTER WATCHDOG DEFINES */
 
@@ -60,16 +59,6 @@ You should also find the complete GPL in the COPYING file accompanying this sour
 #define APCI2200_WATCHDOG_RELOAD_VALUE	4
 #define APCI2200_WATCHDOG_STATUS	16
 
-static int apci2200_di_insn_bits(struct comedi_device *dev,
-				 struct comedi_subdevice *s,
-				 struct comedi_insn *insn,
-				 unsigned int *data)
-{
-	data[1] = inw(dev->iobase + APCI2200_DIGITAL_IP);
-
-	return insn->n;
-}
-
 static int apci2200_do_insn_bits(struct comedi_device *dev,
 				 struct comedi_subdevice *s,
 				 struct comedi_insn *insn,

drivers/staging/comedi/drivers/addi_apci_2200.c

@@ -5,15 +5,18 @@
 
 #include "addi-data/hwdrv_apci2200.c"
 
+/*
+ * I/O Register Map
+ */
+#define APCI2200_DI_REG			0x00
+
 static const struct addi_board apci2200_boardtypes[] = {
 	{
 		.pc_DriverName		= "apci2200",
 		.i_VendorId		= PCI_VENDOR_ID_ADDIDATA,
 		.i_DeviceId		= 0x1005,
-		.i_NbrDiChannel		= 8,
 		.i_NbrDoChannel		= 16,
 		.i_Timer		= 1,
-		.di_bits		= apci2200_di_insn_bits,
 		.do_bits		= apci2200_do_insn_bits,
 		.timer_config		= i_APCI2200_ConfigWatchdog,
 		.timer_write		= i_APCI2200_StartStopWriteWatchdog,
@@ -21,6 +24,16 @@ static const struct addi_board apci2200_boardtypes[] = {
 	},
 };
 
+static int apci2200_di_insn_bits(struct comedi_device *dev,
+				 struct comedi_subdevice *s,
+				 struct comedi_insn *insn,
+				 unsigned int *data)
+{
+	data[1] = inw(dev->iobase + APCI2200_DI_REG);
+
+	return insn->n;
+}
+
 static int apci2200_reset(struct comedi_device *dev)
 {
 	outw(0x0, dev->iobase + APCI2200_DIGITAL_OP);
@@ -92,21 +105,13 @@ static int apci2200_auto_attach(struct comedi_device *dev,
 
 	/*  Allocate and Initialise DI Subdevice Structures */
 	s = &dev->subdevices[2];
-	if (this_board->i_NbrDiChannel) {
-		s->type = COMEDI_SUBD_DI;
-		s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_COMMON;
-		s->n_chan = this_board->i_NbrDiChannel;
-		s->maxdata = 1;
-		s->len_chanlist = this_board->i_NbrDiChannel;
-		s->range_table = &range_digital;
-		s->io_bits = 0;	/* all bits input */
-		s->insn_config = this_board->di_config;
-		s->insn_read = this_board->di_read;
-		s->insn_write = this_board->di_write;
-		s->insn_bits = this_board->di_bits;
-	} else {
-		s->type = COMEDI_SUBD_UNUSED;
-	}
+	s->type		= COMEDI_SUBD_DI;
+	s->subdev_flags	= SDF_READABLE;
+	s->n_chan	= 8;
+	s->maxdata	= 1;
+	s->range_table	= &range_digital;
+	s->insn_bits	= apci2200_di_insn_bits;
+
 	/*  Allocate and Initialise DO Subdevice Structures */
 	s = &dev->subdevices[3];
 	if (this_board->i_NbrDoChannel) {