staging: comedi: dmm32at: rename DMM32AT_AISTAT

For aesthetics, rename this define used for the A/D Status register. Also,
rename the defines for the bits of the register.

The probe code in dmm32at_reset() checks this register to make sure the
S/D1 and S/D0 bits are set. This check actually verifies that the board is
configured (with jumpers on the board) with all the Analog Input channels
operating in single-ended mode. Add a comment about this.

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>

diff --git a/drivers/staging/comedi/drivers/dmm32at.c b/drivers/staging/comedi/drivers/dmm32at.c
index 4ebbd98..3f36f0e 100644 (file)
--- a/drivers/staging/comedi/drivers/dmm32at.c
+++ b/drivers/staging/comedi/drivers/dmm32at.c
@@ -80,7 +80,11 @@ Configuration Options:
 #define DMM32AT_CTRL_PAGE_8254         (0 << 0)
 #define DMM32AT_CTRL_PAGE_8255         (1 << 0)
 #define DMM32AT_CTRL_PAGE_CALIB                (3 << 0)
-#define DMM32AT_AISTAT 0x08
+#define DMM32AT_AI_STATUS_REG          0x08
+#define DMM32AT_AI_STATUS_STS          (1 << 7)
+#define DMM32AT_AI_STATUS_SD1          (1 << 6)
+#define DMM32AT_AI_STATUS_SD0          (1 << 5)
+#define DMM32AT_AI_STATUS_ADCH_MASK    (0x1f << 0)
 
 #define DMM32AT_INTCLOCK 0x09
 
@@ -97,9 +101,6 @@ Configuration Options:
 
 /* Board register values. */
 
-/* DMM32AT_AISTAT 0x08 */
-#define DMM32AT_STATUS 0x80
-
 /* DMM32AT_INTCLOCK 0x09 */
 #define DMM32AT_ADINT 0x80
 #define DMM32AT_CLKSEL 0x03
@@ -190,7 +191,7 @@ static int dmm32at_ai_status(struct comedi_device *dev,
        unsigned char status;
 
        status = inb(dev->iobase + context);
-       if ((status & DMM32AT_STATUS) == 0)
+       if ((status & DMM32AT_AI_STATUS_STS) == 0)
                return 0;
        return -EBUSY;
 }
@@ -214,7 +215,7 @@ static int dmm32at_ai_insn_read(struct comedi_device *dev,
                outb(0xff, dev->iobase + DMM32AT_AI_START_CONV_REG);
 
                ret = comedi_timeout(dev, s, insn, dmm32at_ai_status,
-                                    DMM32AT_AISTAT);
+                                    DMM32AT_AI_STATUS_REG);
                if (ret)
                        return ret;
 
@@ -514,13 +515,19 @@ static int dmm32at_reset(struct comedi_device *dev)
        ailo = inb(dev->iobase + DMM32AT_AI_LO_CHAN_REG);
        aihi = inb(dev->iobase + DMM32AT_AI_HI_CHAN_REG);
        fifostat = inb(dev->iobase + DMM32AT_FIFO_STATUS_REG);
-       aistat = inb(dev->iobase + DMM32AT_AISTAT);
+       aistat = inb(dev->iobase + DMM32AT_AI_STATUS_REG);
        intstat = inb(dev->iobase + DMM32AT_INTCLOCK);
        airback = inb(dev->iobase + DMM32AT_AIRBACK);
 
+       /*
+        * NOTE: The (DMM32AT_AI_STATUS_SD1 | DMM32AT_AI_STATUS_SD0)
+        * test makes this driver only work if the board is configured
+        * with all A/D channels set for single-ended operation.
+        */
        if (ailo != 0x00 || aihi != 0x1f ||
            fifostat != DMM32AT_FIFO_STATUS_EF ||
-           aistat != 0x60 || intstat != 0x00 || airback != 0x0c)
+           aistat != (DMM32AT_AI_STATUS_SD1 | DMM32AT_AI_STATUS_SD0) ||
+           intstat != 0x00 || airback != 0x0c)
                return -EIO;
 
        return 0;