Use comedi_timeout() to wait for the analog input end-of-conversion.
Signed-off-by: H Hartley Sweeten <hswee...@visionengravers.com>
Cc: Ian Abbott <abbo...@mev.co.uk>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/staging/comedi/drivers/mpc624.c | 28 ++++++++++++++++------------
1 file changed, 16 insertions(+), 12 deletions(-)
diff --git a/drivers/staging/comedi/drivers/mpc624.c
b/drivers/staging/comedi/drivers/mpc624.c
index 59ad839..f770400 100644
--- a/drivers/staging/comedi/drivers/mpc624.c
+++ b/drivers/staging/comedi/drivers/mpc624.c
@@ -142,8 +142,18 @@ static const struct comedi_lrange range_mpc624_bipolar10 =
{
}
};
-/* Timeout 200ms */
-#define TIMEOUT 200
+static int mpc624_ai_eoc(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn,
+ unsigned long context)
+{
+ unsigned char status;
+
+ status = inb(dev->iobase + MPC624_ADC);
+ if ((status & MPC624_ADBUSY) == 0)
+ return 0;
+ return -EBUSY;
+}
static int mpc624_ai_rinsn(struct comedi_device *dev,
struct comedi_subdevice *s, struct comedi_insn *insn,
@@ -152,7 +162,7 @@ static int mpc624_ai_rinsn(struct comedi_device *dev,
struct mpc624_private *devpriv = dev->private;
int n, i;
unsigned long int data_in, data_out;
- unsigned char ucPort;
+ int ret;
/*
* WARNING:
@@ -170,15 +180,9 @@ static int mpc624_ai_rinsn(struct comedi_device *dev,
udelay(1);
/* Wait for the conversion to end */
- for (i = 0; i < TIMEOUT; i++) {
- ucPort = inb(dev->iobase + MPC624_ADC);
- if (ucPort & MPC624_ADBUSY)
- udelay(1000);
- else
- break;
- }
- if (i == TIMEOUT)
- return -ETIMEDOUT;
+ ret = comedi_timeout(dev, s, insn, mpc624_ai_eoc, 0);
+ if (ret)
+ return ret;
/* Start reading data */
data_in = 0;
--
1.8.5.2
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