[PATCH 41/47 v2] staging: comedi: pcl812: use comedi_timeout()

[H Hartley Sweeten]

Use comedi_timeout() to wait for the analog input end-of-conversion.

Combine the logic for the pcl812 and acl812 end-of-conversion in the
helper function to simplify the driver.

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>
---
 drivers/staging/comedi/drivers/pcl812.c | 68 +++++++++++++++++++--------------
 1 file changed, 39 insertions(+), 29 deletions(-)

diff --git a/drivers/staging/comedi/drivers/pcl812.c b/drivers/staging/comedi/drivers/pcl812.c
index 53613b38..2ad6c73 100644
--- a/drivers/staging/comedi/drivers/pcl812.c
+++ b/drivers/staging/comedi/drivers/pcl812.c
@@ -394,16 +394,35 @@ static void setup_range_channel(struct comedi_device *dev,
 				unsigned int rangechan, char wait);
 static int pcl812_ai_cancel(struct comedi_device *dev,
 			    struct comedi_subdevice *s);
-/*
-==============================================================================
-*/
+
+static int pcl812_ai_eoc(struct comedi_device *dev,
+			 struct comedi_subdevice *s,
+			 struct comedi_insn *insn,
+			 unsigned long context)
+{
+	struct pcl812_private *devpriv = dev->private;
+	unsigned int status;
+
+	if (devpriv->ai_is16b) {
+		status = inb(dev->iobase + ACL8216_STATUS);
+		if ((status & ACL8216_DRDY) == 0)
+			return 0;
+	} else {
+		status = inb(dev->iobase + PCL812_AD_HI);
+		if ((status & PCL812_DRDY) == 0)
+			return 0;
+	}
+	return -EBUSY;
+}
+
 static int pcl812_ai_insn_read(struct comedi_device *dev,
 			       struct comedi_subdevice *s,
 			       struct comedi_insn *insn, unsigned int *data)
 {
 	struct pcl812_private *devpriv = dev->private;
+	int ret = 0;
 	int n;
-	int timeout, hi;
+	int hi;
 
 	/* select software trigger */
 	outb(devpriv->mode_reg_int | 1, dev->iobase + PCL812_MODE);
@@ -413,33 +432,27 @@ static int pcl812_ai_insn_read(struct comedi_device *dev,
 		/* start conversion */
 		outb(255, dev->iobase + PCL812_SOFTTRIG);
 		udelay(5);
-		timeout = 50;	/* wait max 50us, it must finish under 33us */
-		while (timeout--) {
-			hi = inb(dev->iobase + PCL812_AD_HI);
-			if (!(hi & PCL812_DRDY))
-				goto conv_finish;
-			udelay(1);
+
+		ret = comedi_timeout(dev, s, insn, pcl812_ai_eoc, 0);
+		if (ret) {
+			dev_dbg(dev->class_dev, "A/D insn read timeout\n");
+			break;
 		}
-		dev_dbg(dev->class_dev, "A/D insn read timeout\n");
-		outb(devpriv->mode_reg_int | 0, dev->iobase + PCL812_MODE);
-		return -ETIME;
 
-conv_finish:
+		hi = inb(dev->iobase + PCL812_AD_HI);
 		data[n] = ((hi & 0xf) << 8) | inb(dev->iobase + PCL812_AD_LO);
 	}
 	outb(devpriv->mode_reg_int | 0, dev->iobase + PCL812_MODE);
-	return n;
+
+	return ret ? ret : n;
 }
 
-/*
-==============================================================================
-*/
 static int acl8216_ai_insn_read(struct comedi_device *dev,
 				struct comedi_subdevice *s,
 				struct comedi_insn *insn, unsigned int *data)
 {
+	int ret = 0;
 	int n;
-	int timeout;
 
 	/* select software trigger */
 	outb(1, dev->iobase + PCL812_MODE);
@@ -449,23 +462,20 @@ static int acl8216_ai_insn_read(struct comedi_device *dev,
 		/* start conversion */
 		outb(255, dev->iobase + PCL812_SOFTTRIG);
 		udelay(5);
-		timeout = 50;	/* wait max 50us, it must finish under 33us */
-		while (timeout--) {
-			if (!(inb(dev->iobase + ACL8216_STATUS) & ACL8216_DRDY))
-				goto conv_finish;
-			udelay(1);
+
+		ret = comedi_timeout(dev, s, insn, pcl812_ai_eoc, 0);
+		if (ret) {
+			dev_dbg(dev->class_dev, "A/D insn read timeout\n");
+			break;
 		}
-		dev_dbg(dev->class_dev, "A/D insn read timeout\n");
-		outb(0, dev->iobase + PCL812_MODE);
-		return -ETIME;
 
-conv_finish:
 		data[n] =
 		    (inb(dev->iobase +
 			 PCL812_AD_HI) << 8) | inb(dev->iobase + PCL812_AD_LO);
 	}
 	outb(0, dev->iobase + PCL812_MODE);
-	return n;
+
+	return ret ? ret : n;
 }
 
 /*
-- 
1.8.5.2