staging: comedi: cb_das16_cs: define the misc1 and misc2 register bits

Define the bits in these registers and use them to remove the "magic"
values in the driver.
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_das16_cs.c

@@ -51,7 +51,48 @@
 #define DAS16CS_AI_MUX_SINGLE_CHAN(x)	(DAS16CS_AI_MUX_HI_CHAN(x) |	\
 					 DAS16CS_AI_MUX_LO_CHAN(x))
 #define DAS16CS_MISC1_REG		0x04
+#define DAS16CS_MISC1_INTE		BIT(15)	/* 1=enable; 0=disable */
+#define DAS16CS_MISC1_INT_SRC(x)	(((x) & 0x7) << 12) /* interrupt src */
+#define DAS16CS_MISC1_INT_SRC_NONE	DAS16CS_MISC1_INT_SRC(0)
+#define DAS16CS_MISC1_INT_SRC_PACER	DAS16CS_MISC1_INT_SRC(1)
+#define DAS16CS_MISC1_INT_SRC_EXT	DAS16CS_MISC1_INT_SRC(2)
+#define DAS16CS_MISC1_INT_SRC_FNE	DAS16CS_MISC1_INT_SRC(3)
+#define DAS16CS_MISC1_INT_SRC_FHF	DAS16CS_MISC1_INT_SRC(4)
+#define DAS16CS_MISC1_INT_SRC_EOS	DAS16CS_MISC1_INT_SRC(5)
+#define DAS16CS_MISC1_INT_SRC_MASK	DAS16CS_MISC1_INT_SRC(7)
+#define DAS16CS_MISC1_OVR		BIT(10)	/* ro - 1=FIFO overflow */
+#define DAS16CS_MISC1_AI_CONV(x)	(((x) & 0x3) << 8) /* AI convert src */
+#define DAS16CS_MISC1_AI_CONV_SW	DAS16CS_MISC1_AI_CONV(0)
+#define DAS16CS_MISC1_AI_CONV_EXT_NEG	DAS16CS_MISC1_AI_CONV(1)
+#define DAS16CS_MISC1_AI_CONV_EXT_POS	DAS16CS_MISC1_AI_CONV(2)
+#define DAS16CS_MISC1_AI_CONV_PACER	DAS16CS_MISC1_AI_CONV(3)
+#define DAS16CS_MISC1_AI_CONV_MASK	DAS16CS_MISC1_AI_CONV(3)
+#define DAS16CS_MISC1_EOC		BIT(7)	/* ro - 0=busy; 1=ready */
+#define DAS16CS_MISC1_SEDIFF		BIT(5)	/* 0=diff; 1=se */
+#define DAS16CS_MISC1_INTB		BIT(4)	/* ro - 0=latched; 1=cleared */
+#define DAS16CS_MISC1_MA_MASK		(0xf << 0) /* ro - current ai mux */
+#define DAS16CS_MISC1_DAC1CS		BIT(3)	/* wo - DAC1 chip select */
+#define DAS16CS_MISC1_DACCLK		BIT(2)	/* wo - Serial DAC clock */
+#define DAS16CS_MISC1_DACSD		BIT(1)	/* wo - Serial DAC data */
+#define DAS16CS_MISC1_DAC0CS		BIT(0)	/* wo - DAC0 chip select */
+#define DAS16CS_MISC1_DAC_MASK		(0x0f << 0)
 #define DAS16CS_MISC2_REG		0x06
+#define DAS16CS_MISC2_BME		BIT(14)	/* 1=burst enable; 0=disable */
+#define DAS16CS_MISC2_AI_GAIN(x)	(((x) & 0xf) << 8) /* AI gain */
+#define DAS16CS_MISC2_AI_GAIN_1		DAS16CS_MISC2_AI_GAIN(4) /* +/-10V */
+#define DAS16CS_MISC2_AI_GAIN_2		DAS16CS_MISC2_AI_GAIN(0) /* +/-5V */
+#define DAS16CS_MISC2_AI_GAIN_4		DAS16CS_MISC2_AI_GAIN(1) /* +/-2.5V */
+#define DAS16CS_MISC2_AI_GAIN_8		DAS16CS_MISC2_AI_GAIN(2) /* +-1.25V */
+#define DAS16CS_MISC2_AI_GAIN_MASK	DAS16CS_MISC2_AI_GAIN(0xf)
+#define DAS16CS_MISC2_UDIR		BIT(7)	/* 1=dio7:4 output; 0=input */
+#define DAS16CS_MISC2_LDIR		BIT(6)	/* 1=dio3:0 output; 0=input */
+#define DAS16CS_MISC2_TRGPOL		BIT(5)	/* 1=active lo; 0=hi */
+#define DAS16CS_MISC2_TRGSEL		BIT(4)	/* 1=edge; 0=level */
+#define DAS16CS_MISC2_FFNE		BIT(3)	/* ro - 1=FIFO not empty */
+#define DAS16CS_MISC2_TRGCLR		BIT(3)	/* wo - 1=clr (monstable) */
+#define DAS16CS_MISC2_CLK2		BIT(2)	/* 1=10 MHz; 0=1 MHz */
+#define DAS16CS_MISC2_CTR1		BIT(1)	/* 1=int. 100 kHz; 0=ext. clk */
+#define DAS16CS_MISC2_TRG0		BIT(0)	/* 1=enable; 0=disable */
 #define DAS16CS_TIMER_BASE		0x08
 #define DAS16CS_DIO_REG			0x10
 
@@ -99,7 +140,7 @@ static int das16cs_ai_eoc(struct comedi_device *dev,
 	unsigned int status;
 
 	status = inw(dev->iobase + DAS16CS_MISC1_REG);
-	if (status & 0x0080)
+	if (status & DAS16CS_MISC1_EOC)
 		return 0;
 	return -EBUSY;
 }
@@ -118,23 +159,28 @@ static int das16cs_ai_rinsn(struct comedi_device *dev,
 	outw(DAS16CS_AI_MUX_SINGLE_CHAN(chan),
 	     dev->iobase + DAS16CS_AI_MUX_REG);
 
-	devpriv->status1 &= ~0xf320;
-	devpriv->status1 |= (aref == AREF_DIFF) ? 0 : 0x0020;
+	/* disable interrupts, software convert */
+	devpriv->status1 &= ~(DAS16CS_MISC1_INTE | DAS16CS_MISC1_INT_SRC_MASK |
+			      DAS16CS_MISC1_AI_CONV_MASK);
+	if (aref == AREF_DIFF)
+		devpriv->status1 &= ~DAS16CS_MISC1_SEDIFF;
+	else
+		devpriv->status1 |= DAS16CS_MISC1_SEDIFF;
 	outw(devpriv->status1, dev->iobase + DAS16CS_MISC1_REG);
 
-	devpriv->status2 &= ~0xff00;
+	devpriv->status2 &= ~(DAS16CS_MISC2_BME | DAS16CS_MISC2_AI_GAIN_MASK);
 	switch (range) {
 	case 0:
-		devpriv->status2 |= 0x800;
+		devpriv->status2 |= DAS16CS_MISC2_AI_GAIN_1;
 		break;
 	case 1:
-		devpriv->status2 |= 0x000;
+		devpriv->status2 |= DAS16CS_MISC2_AI_GAIN_2;
 		break;
 	case 2:
-		devpriv->status2 |= 0x100;
+		devpriv->status2 |= DAS16CS_MISC2_AI_GAIN_4;
 		break;
 	case 3:
-		devpriv->status2 |= 0x200;
+		devpriv->status2 |= DAS16CS_MISC2_AI_GAIN_8;
 		break;
 	}
 	outw(devpriv->status2, dev->iobase + DAS16CS_MISC2_REG);
@@ -170,23 +216,24 @@ static int das16cs_ao_insn_write(struct comedi_device *dev,
 		outw(devpriv->status1, dev->iobase + DAS16CS_MISC1_REG);
 		udelay(1);
 
-		status1 = devpriv->status1 & ~0xf;
+		/* raise the DACxCS line for the non-selected channel */
+		status1 = devpriv->status1 & ~DAS16CS_MISC1_DAC_MASK;
 		if (chan)
-			status1 |= 0x0001;
+			status1 |= DAS16CS_MISC1_DAC0CS;
 		else
-			status1 |= 0x0008;
+			status1 |= DAS16CS_MISC1_DAC1CS;
 
 		outw(status1, dev->iobase + DAS16CS_MISC1_REG);
 		udelay(1);
 
 		for (bit = 15; bit >= 0; bit--) {
-			int b = (val >> bit) & 0x1;
-
-			b <<= 1;
-			outw(status1 | b | 0x0000,
-			     dev->iobase + DAS16CS_MISC1_REG);
+			if ((val >> bit) & 0x1)
+				status1 |= DAS16CS_MISC1_DACSD;
+			else
+				status1 &= ~DAS16CS_MISC1_DACSD;
+			outw(status1, dev->iobase + DAS16CS_MISC1_REG);
 			udelay(1);
-			outw(status1 | b | 0x0004,
+			outw(status1 | DAS16CS_MISC1_DACCLK,
 			     dev->iobase + DAS16CS_MISC1_REG);
 			udelay(1);
 		}
@@ -194,7 +241,8 @@ static int das16cs_ao_insn_write(struct comedi_device *dev,
 		 * Make both DAC0CS and DAC1CS high to load
 		 * the new data and update analog the output
 		 */
-		outw(status1 | 0x9, dev->iobase + DAS16CS_MISC1_REG);
+		outw(status1 | DAS16CS_MISC1_DAC0CS | DAS16CS_MISC1_DAC1CS,
+		     dev->iobase + DAS16CS_MISC1_REG);
 	}
 	s->readback[chan] = val;
 
@@ -233,10 +281,14 @@ static int das16cs_dio_insn_config(struct comedi_device *dev,
 	if (ret)
 		return ret;
 
-	devpriv->status2 &= ~0x00c0;
-	devpriv->status2 |= (s->io_bits & 0xf0) ? 0x0080 : 0;
-	devpriv->status2 |= (s->io_bits & 0x0f) ? 0x0040 : 0;
-
+	if (s->io_bits & 0xf0)
+		devpriv->status2 |= DAS16CS_MISC2_UDIR;
+	else
+		devpriv->status2 &= ~DAS16CS_MISC2_UDIR;
+	if (s->io_bits & 0x0f)
+		devpriv->status2 |= DAS16CS_MISC2_LDIR;
+	else
+		devpriv->status2 &= ~DAS16CS_MISC2_LDIR;
 	outw(devpriv->status2, dev->iobase + DAS16CS_MISC2_REG);
 
 	return insn->n;