staging: comedi: cb_pcidas: tidy up DAC control/status register

Rename this register and its bit defines so they have namespace
associated with the driver. Use the BIT macro to define the bits.

For aesthetics, rename the associated member of the private data.
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/cb_pcidas.c

@@ -133,22 +133,21 @@
 #define PCIDAS_CALIB_EN		BIT(14)	/* calibration source enable */
 #define PCIDAS_CALIB_DATA	BIT(15)	/* serial data bit going to caldac */
 
-#define DAC_CSR			0x8	/* dac control and status register */
-#define   DACEN			0x02	/* dac enable */
-#define   DAC_MODE_UPDATE_BOTH	0x80	/* update both dacs */
-
-#define   DAC_RANGE(c, r)	(((r) & 0x3) << (8 + 2 * ((c) & 0x1)))
-#define   DAC_RANGE_MASK(c)	DAC_RANGE((c), 0x3)
-
-/* bits for 1602 series only */
-#define   DAC_EMPTY		0x1	/* fifo empty, read, write clear */
-#define   DAC_START		0x4	/* start/arm fifo operations */
-#define   DAC_PACER_MASK	0x18	/* bits that set pacer source */
-#define   DAC_PACER_INT		0x8	/* int. pacing */
-#define   DAC_PACER_EXT_FALL	0x10	/* ext. pacing, falling edge */
-#define   DAC_PACER_EXT_RISE	0x18	/* ext. pacing, rising edge */
-
-#define   DAC_CHAN_EN(c)	BIT(5 + ((c) & 0x1))
+#define PCIDAS_AO_REG		0x08	/* dac control and status register */
+#define PCIDAS_AO_EMPTY		BIT(0)	/* fifo empty, write clear (1602) */
+#define PCIDAS_AO_DACEN		BIT(1)	/* dac enable */
+#define PCIDAS_AO_START		BIT(2)	/* start/arm fifo (1602) */
+#define PCIDAS_AO_PACER(x)	(((x) & 0x3) << 3) /* (1602) */
+#define PCIDAS_AO_PACER_SW	PCIDAS_AO_PACER(0) /* software pacer */
+#define PCIDAS_AO_PACER_INT	PCIDAS_AO_PACER(1) /* int. pacer */
+#define PCIDAS_AO_PACER_EXTN	PCIDAS_AO_PACER(2) /* ext. falling edge */
+#define PCIDAS_AO_PACER_EXTP	PCIDAS_AO_PACER(3) /* ext. rising edge */
+#define PCIDAS_AO_PACER_MASK	PCIDAS_AO_PACER(3) /* pacer source bits */
+#define PCIDAS_AO_CHAN_EN(c)	BIT(5 + ((c) & 0x1))
+#define PCIDAS_AO_CHAN_MASK	(PCIDAS_AO_CHAN_EN(0) | PCIDAS_AO_CHAN_EN(1))
+#define PCIDAS_AO_UPDATE_BOTH	BIT(7)	/* update both dacs */
+#define PCIDAS_AO_RANGE(c, r)	(((r) & 0x3) << (8 + 2 * ((c) & 0x1)))
+#define PCIDAS_AO_RANGE_MASK(c)	PCIDAS_AO_RANGE((c), 0x3)
 
 /*
  * PCI BAR2 Register map (devpriv->pcibar2)
@@ -316,7 +315,7 @@ struct cb_pcidas_private {
 	/* bits to write to registers */
 	unsigned int ctrl;
 	unsigned int s5933_intcsr_bits;
-	unsigned int ao_control_bits;
+	unsigned int ao_ctrl;
 	/* fifo buffers */
 	unsigned short ai_buffer[AI_BUFFER_SIZE];
 	unsigned short ao_buffer[AO_BUFFER_SIZE];
@@ -432,10 +431,10 @@ static int cb_pcidas_ao_nofifo_winsn(struct comedi_device *dev,
 
 	/* set channel and range */
 	spin_lock_irqsave(&dev->spinlock, flags);
-	devpriv->ao_control_bits &= (~DAC_MODE_UPDATE_BOTH &
-				     ~DAC_RANGE_MASK(chan));
-	devpriv->ao_control_bits |= (DACEN | DAC_RANGE(chan, range));
-	outw(devpriv->ao_control_bits, devpriv->pcibar1 + DAC_CSR);
+	devpriv->ao_ctrl &= ~(PCIDAS_AO_UPDATE_BOTH |
+			      PCIDAS_AO_RANGE_MASK(chan));
+	devpriv->ao_ctrl |= PCIDAS_AO_DACEN | PCIDAS_AO_RANGE(chan, range);
+	outw(devpriv->ao_ctrl, devpriv->pcibar1 + PCIDAS_AO_REG);
 	spin_unlock_irqrestore(&dev->spinlock, flags);
 
 	/* remember value for readback */
@@ -462,11 +461,11 @@ static int cb_pcidas_ao_fifo_winsn(struct comedi_device *dev,
 
 	/* set channel and range */
 	spin_lock_irqsave(&dev->spinlock, flags);
-	devpriv->ao_control_bits &= (~DAC_CHAN_EN(0) & ~DAC_CHAN_EN(1) &
-				     ~DAC_RANGE_MASK(chan) & ~DAC_PACER_MASK);
-	devpriv->ao_control_bits |= (DACEN | DAC_RANGE(chan, range) |
-				     DAC_CHAN_EN(chan) | DAC_START);
-	outw(devpriv->ao_control_bits, devpriv->pcibar1 + DAC_CSR);
+	devpriv->ao_ctrl &= ~(PCIDAS_AO_CHAN_MASK | PCIDAS_AO_RANGE_MASK(chan) |
+			      PCIDAS_AO_PACER_MASK);
+	devpriv->ao_ctrl |= PCIDAS_AO_DACEN | PCIDAS_AO_RANGE(chan, range) |
+			    PCIDAS_AO_CHAN_EN(chan) | PCIDAS_AO_START;
+	outw(devpriv->ao_ctrl, devpriv->pcibar1 + PCIDAS_AO_REG);
 	spin_unlock_irqrestore(&dev->spinlock, flags);
 
 	/* remember value for readback */
@@ -1083,8 +1082,8 @@ static int cb_pcidas_ao_inttrig(struct comedi_device *dev,
 	     devpriv->pcibar1 + PCIDAS_CTRL_REG);
 
 	/*  start dac */
-	devpriv->ao_control_bits |= DAC_START | DACEN | DAC_EMPTY;
-	outw(devpriv->ao_control_bits, devpriv->pcibar1 + DAC_CSR);
+	devpriv->ao_ctrl |= PCIDAS_AO_START | PCIDAS_AO_DACEN | PCIDAS_AO_EMPTY;
+	outw(devpriv->ao_ctrl, devpriv->pcibar1 + PCIDAS_AO_REG);
 
 	spin_unlock_irqrestore(&dev->spinlock, flags);
 
@@ -1109,13 +1108,13 @@ static int cb_pcidas_ao_cmd(struct comedi_device *dev,
 		unsigned int range = CR_RANGE(cmd->chanlist[i]);
 
 		/*  enable channel */
-		devpriv->ao_control_bits |= DAC_CHAN_EN(chan);
+		devpriv->ao_ctrl |= PCIDAS_AO_CHAN_EN(chan);
 		/*  set range */
-		devpriv->ao_control_bits |= DAC_RANGE(chan, range);
+		devpriv->ao_ctrl |= PCIDAS_AO_RANGE(chan, range);
 	}
 
 	/*  disable analog out before settings pacer source and count values */
-	outw(devpriv->ao_control_bits, devpriv->pcibar1 + DAC_CSR);
+	outw(devpriv->ao_ctrl, devpriv->pcibar1 + PCIDAS_AO_REG);
 	spin_unlock_irqrestore(&dev->spinlock, flags);
 
 	/*  clear fifo */
@@ -1131,10 +1130,10 @@ static int cb_pcidas_ao_cmd(struct comedi_device *dev,
 	spin_lock_irqsave(&dev->spinlock, flags);
 	switch (cmd->scan_begin_src) {
 	case TRIG_TIMER:
-		devpriv->ao_control_bits |= DAC_PACER_INT;
+		devpriv->ao_ctrl |= PCIDAS_AO_PACER_INT;
 		break;
 	case TRIG_EXT:
-		devpriv->ao_control_bits |= DAC_PACER_EXT_RISE;
+		devpriv->ao_ctrl |= PCIDAS_AO_PACER_EXTP;
 		break;
 	default:
 		spin_unlock_irqrestore(&dev->spinlock, flags);
@@ -1161,8 +1160,8 @@ static int cb_pcidas_ao_cancel(struct comedi_device *dev,
 	outw(devpriv->ctrl, devpriv->pcibar1 + PCIDAS_CTRL_REG);
 
 	/*  disable output */
-	devpriv->ao_control_bits &= ~DACEN & ~DAC_PACER_MASK;
-	outw(devpriv->ao_control_bits, devpriv->pcibar1 + DAC_CSR);
+	devpriv->ao_ctrl &= ~(PCIDAS_AO_DACEN | PCIDAS_AO_PACER_MASK);
+	outw(devpriv->ao_ctrl, devpriv->pcibar1 + PCIDAS_AO_REG);
 	spin_unlock_irqrestore(&dev->spinlock, flags);
 
 	return 0;
@@ -1183,7 +1182,7 @@ static void handle_ao_interrupt(struct comedi_device *dev, unsigned int status)
 		outw(devpriv->ctrl | PCIDAS_CTRL_DAEMI,
 		     devpriv->pcibar1 + PCIDAS_CTRL_REG);
 		spin_unlock_irqrestore(&dev->spinlock, flags);
-		if (inw(devpriv->pcibar4 + DAC_CSR) & DAC_EMPTY) {
+		if (inw(devpriv->pcibar4 + PCIDAS_AO_REG) & PCIDAS_AO_EMPTY) {
 			if (cmd->stop_src == TRIG_COUNT &&
 			    async->scans_done >= cmd->stop_arg) {
 				async->events |= COMEDI_CB_EOA;