staging: comedi: me_daq: tidy up status register defines

Rename the bits of this register so they have association with the
register. Use the BIT macro to define the bits.

Writing to the status register clears any pending interrupts. For
aesthetics, remove the ME_RESET_INTERRUPT define and just use the
ME_STATUS_REG define to write the register.
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/me_daq.c

@@ -70,18 +70,17 @@
 #define   ME_CTRL2_COUNTER_A_ENA	BIT(3)
 #define   ME_CTRL2_DAC_ENA		BIT(1)
 #define   ME_CTRL2_BUFFERED_DAC		BIT(0)
-#define ME_STATUS			0x0004	/* R | - */
-#define   COUNTER_B_IRQ_PENDING		(1<<12)
-#define   COUNTER_A_IRQ_PENDING		(1<<11)
-#define   CHANLIST_READY_IRQ_PENDING	(1<<10)
-#define   EXT_IRQ_PENDING		(1<<9)
-#define   ADFIFO_HALFFULL_IRQ_PENDING	(1<<8)
-#define   ADFIFO_FULL			(1<<4)
-#define   ADFIFO_HALFFULL		(1<<3)
-#define   ADFIFO_EMPTY			(1<<2)
-#define   CHANLIST_FULL			(1<<1)
-#define   FST_ACTIVE			(1<<0)
-#define ME_RESET_INTERRUPT		0x0004	/* - | W */
+#define ME_STATUS_REG			0x04	/* R | W (clears interrupts) */
+#define   ME_STATUS_COUNTER_B_IRQ	BIT(12)
+#define   ME_STATUS_COUNTER_A_IRQ	BIT(11)
+#define   ME_STATUS_CHANLIST_READY_IRQ	BIT(10)
+#define   ME_STATUS_EXT_IRQ		BIT(9)
+#define   ME_STATUS_ADFIFO_HALFFULL_IRQ	BIT(8)
+#define   ME_STATUS_ADFIFO_FULL		BIT(4)
+#define   ME_STATUS_ADFIFO_HALFFULL	BIT(3)
+#define   ME_STATUS_ADFIFO_EMPTY	BIT(2)
+#define   ME_STATUS_CHANLIST_FULL	BIT(1)
+#define   ME_STATUS_FST_ACTIVE		BIT(0)
 #define ME_DIO_PORT_A			0x0006	/* R | W */
 #define ME_DIO_PORT_B			0x0008	/* R | W */
 #define ME_TIMER_DATA_0			0x000A	/* - | W */
@@ -252,8 +251,8 @@ static int me_ai_eoc(struct comedi_device *dev,
 {
 	unsigned int status;
 
-	status = readw(dev->mmio + ME_STATUS);
-	if ((status & 0x0004) == 0)
+	status = readw(dev->mmio + ME_STATUS_REG);
+	if ((status & ME_STATUS_ADFIFO_EMPTY) == 0)
 		return 0;
 	return -EBUSY;
 }
@@ -278,8 +277,7 @@ static int me_ai_insn_read(struct comedi_device *dev,
 	devpriv->ctrl2 &= ~(ME_CTRL2_ADFIFO_ENA | ME_CTRL2_CHANLIST_ENA);
 	writew(devpriv->ctrl2, dev->mmio + ME_CTRL2_REG);
 
-	/* reset any pending interrupt */
-	writew(0x00, dev->mmio + ME_RESET_INTERRUPT);
+	writew(0x00, dev->mmio + ME_STATUS_REG);	/* clear interrupts */
 
 	/* enable the chanlist and ADC fifo */
 	devpriv->ctrl2 |= (ME_CTRL2_ADFIFO_ENA | ME_CTRL2_CHANLIST_ENA);
@@ -442,7 +440,7 @@ static int me_reset(struct comedi_device *dev)
 	/* Reset board */
 	writew(0x00, dev->mmio + ME_CTRL1_REG);
 	writew(0x00, dev->mmio + ME_CTRL2_REG);
-	writew(0x00, dev->mmio + ME_RESET_INTERRUPT);
+	writew(0x00, dev->mmio + ME_STATUS_REG);	/* clear interrupts */
 	writew(0x00, dev->mmio + ME_DAC_CONTROL);
 
 	/* Save values in the board context */