[PATCH 009/108] staging: comedi: addi_apci_3120: tidy up timer_mode masking

[H Hartley Sweeten]

Define a macro that returns the mask of the timer_mode bits for a given
timer. Use the macro to remove the "magic" values used to clear the bits.

Signed-off-by: H Hartley Sweeten <hsweeten at visionengravers.com>
Cc: Ian Abbott <abbotti at mev.co.uk>
Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 .../staging/comedi/drivers/addi-data/hwdrv_apci3120.c    | 16 ++++++++--------
 drivers/staging/comedi/drivers/addi_apci_3120.c          |  1 +
 2 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/staging/comedi/drivers/addi-data/hwdrv_apci3120.c b/drivers/staging/comedi/drivers/addi-data/hwdrv_apci3120.c
index 546c4c3..a876ada 100644
--- a/drivers/staging/comedi/drivers/addi-data/hwdrv_apci3120.c
+++ b/drivers/staging/comedi/drivers/addi-data/hwdrv_apci3120.c
@@ -373,7 +373,7 @@ static int apci3120_ai_insn_read(struct comedi_device *dev,
 				return -EINVAL;
 
 			/* Initialize Timer 0 mode 4 */
-			devpriv->timer_mode &= 0xfc;
+			devpriv->timer_mode &= ~APCI3120_TIMER_MODE_MASK(0);
 			devpriv->timer_mode |= APCI3120_TIMER_0_MODE_4;
 			outb(devpriv->timer_mode,
 			     dev->iobase + APCI3120_TIMER_CRT1);
@@ -456,7 +456,7 @@ static int apci3120_ai_insn_read(struct comedi_device *dev,
 				return -EINVAL;
 
 			/* Initialize Timer 0 mode 2 */
-			devpriv->timer_mode &= 0xfc;
+			devpriv->timer_mode &= ~APCI3120_TIMER_MODE_MASK(0);
 			devpriv->timer_mode |= APCI3120_TIMER_0_MODE_2;
 			outb(devpriv->timer_mode,
 			     dev->iobase + APCI3120_TIMER_CRT1);
@@ -755,7 +755,7 @@ static int apci3120_cyclic_ai(int mode,
 	switch (mode) {
 	case 1:
 		/*  init timer0 in mode 2 */
-		devpriv->timer_mode &= 0xfc;
+		devpriv->timer_mode &= ~APCI3120_TIMER_MODE_MASK(0);
 		devpriv->timer_mode |= APCI3120_TIMER_0_MODE_2;
 		outb(devpriv->timer_mode, dev->iobase + APCI3120_TIMER_CRT1);
 
@@ -765,7 +765,7 @@ static int apci3120_cyclic_ai(int mode,
 
 	case 2:
 		/*  init timer1 in mode 2 */
-		devpriv->timer_mode &= 0xf3;
+		devpriv->timer_mode &= ~APCI3120_TIMER_MODE_MASK(1);
 		devpriv->timer_mode |= APCI3120_TIMER_1_MODE_2;
 		outb(devpriv->timer_mode, dev->iobase + APCI3120_TIMER_CRT1);
 
@@ -773,7 +773,7 @@ static int apci3120_cyclic_ai(int mode,
 		apci3120_timer_write(dev, 1, divisor1);
 
 		/*  init timer0 in mode 2 */
-		devpriv->timer_mode &= 0xfc;
+		devpriv->timer_mode &= ~APCI3120_TIMER_MODE_MASK(0);
 		devpriv->timer_mode |= APCI3120_TIMER_0_MODE_2;
 		outb(devpriv->timer_mode, dev->iobase + APCI3120_TIMER_CRT1);
 
@@ -824,7 +824,7 @@ static int apci3120_cyclic_ai(int mode,
 				dev->iobase + APCI3120_WRITE_MODE_SELECT);
 
 			/* (1) Init timer 2 in mode 0 and write timer value */
-			devpriv->timer_mode &= 0x0f;
+			devpriv->timer_mode &= ~APCI3120_TIMER_MODE_MASK(2);
 			devpriv->timer_mode |= APCI3120_TIMER_2_MODE_0;
 			outb(devpriv->timer_mode,
 			     dev->iobase + APCI3120_TIMER_CRT1);
@@ -1422,7 +1422,7 @@ static int apci3120_config_insn_timer(struct comedi_device *dev,
 	     dev->iobase + APCI3120_WRITE_MODE_SELECT);
 	if (data[0] == APCI3120_TIMER) {	/* initialize timer */
 		/* Set the Timer 2 in mode 2(Timer) */
-		devpriv->timer_mode &= 0x0f;
+		devpriv->timer_mode &= ~APCI3120_TIMER_MODE_MASK(2);
 		devpriv->timer_mode |= APCI3120_TIMER_2_MODE_2;
 		outb(devpriv->timer_mode, dev->iobase + APCI3120_TIMER_CRT1);
 
@@ -1435,7 +1435,7 @@ static int apci3120_config_insn_timer(struct comedi_device *dev,
 	} else {			/*  Initialize Watch dog */
 
 		/* Set the Timer 2 in mode 5(Watchdog) */
-		devpriv->timer_mode &= 0x0f;
+		devpriv->timer_mode &= ~APCI3120_TIMER_MODE_MASK(2);
 		devpriv->timer_mode |= APCI3120_TIMER_2_MODE_5;
 		outb(devpriv->timer_mode, dev->iobase + APCI3120_TIMER_CRT1);
 
diff --git a/drivers/staging/comedi/drivers/addi_apci_3120.c b/drivers/staging/comedi/drivers/addi_apci_3120.c
index 6882f8e..999add3 100644
--- a/drivers/staging/comedi/drivers/addi_apci_3120.c
+++ b/drivers/staging/comedi/drivers/addi_apci_3120.c
@@ -20,6 +20,7 @@
 #define APCI3120_AO_REG(x)			(0x08 + (((x) / 4) * 2))
 #define APCI3120_AO_MUX(x)			(((x) & 0x3) << 14)
 #define APCI3120_AO_DATA(x)			((x) << 0)
+#define APCI3120_TIMER_MODE_MASK(_t)		(3 << ((_t) * 2))
 #define APCI3120_CTR0_REG			0x0d
 #define APCI3120_CTR0_DO_BITS(x)		((x) << 4)
 #define APCI3120_CTR0_TIMER_SEL(x)		((x) << 0)
-- 
2.0.3