staging: comedi: dmm32at: use comedi_timeout()

Use comedi_timeout() to wait for the analog input settle and end-of-
conversion. These tests use different registers but the same bit so
the register is passed as the 'context'. The same test is used in
dmm32at_ai_cmd() but the 'insn' is not available. This is ok since
the test function, and comedi_timeout() don't use it.

Use comedi_timout() to wait for the analog output end-of-conversion.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: 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 78a1962..c8a36eb 100644 (file)
--- a/drivers/staging/comedi/drivers/dmm32at.c
+++ b/drivers/staging/comedi/drivers/dmm32at.c
@@ -164,16 +164,29 @@ struct dmm32at_private {
 
 };
 
+static int dmm32at_ai_status(struct comedi_device *dev,
+                            struct comedi_subdevice *s,
+                            struct comedi_insn *insn,
+                            unsigned long context)
+{
+       unsigned char status;
+
+       status = inb(dev->iobase + context);
+       if ((status & DMM32AT_STATUS) == 0)
+               return 0;
+       return -EBUSY;
+}
+
 static int dmm32at_ai_rinsn(struct comedi_device *dev,
                            struct comedi_subdevice *s,
                            struct comedi_insn *insn, unsigned int *data)
 {
-       int n, i;
+       int n;
        unsigned int d;
-       unsigned char status;
        unsigned short msb, lsb;
        unsigned char chan;
        int range;
+       int ret;
 
        /* get the channel and range number */
 
@@ -190,26 +203,20 @@ static int dmm32at_ai_rinsn(struct comedi_device *dev,
        outb(dmm32at_rangebits[range], dev->iobase + DMM32AT_AICONF);
 
        /* wait for circuit to settle */
-       for (i = 0; i < 40000; i++) {
-               status = inb(dev->iobase + DMM32AT_AIRBACK);
-               if ((status & DMM32AT_STATUS) == 0)
-                       break;
-       }
-       if (i == 40000)
-               return -ETIMEDOUT;
+       ret = comedi_timeout(dev, s, insn, dmm32at_ai_status, DMM32AT_AIRBACK);
+       if (ret)
+               return ret;
 
        /* convert n samples */
        for (n = 0; n < insn->n; n++) {
                /* trigger conversion */
                outb(0xff, dev->iobase + DMM32AT_CONV);
+
                /* wait for conversion to end */
-               for (i = 0; i < 40000; i++) {
-                       status = inb(dev->iobase + DMM32AT_AISTAT);
-                       if ((status & DMM32AT_STATUS) == 0)
-                               break;
-               }
-               if (i == 40000)
-                       return -ETIMEDOUT;
+               ret = comedi_timeout(dev, s, insn, dmm32at_ai_status,
+                                    DMM32AT_AISTAT);
+               if (ret)
+                       return ret;
 
                /* read data */
                lsb = inb(dev->iobase + DMM32AT_AILSB);
@@ -403,8 +410,9 @@ static int dmm32at_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
 {
        struct dmm32at_private *devpriv = dev->private;
        struct comedi_cmd *cmd = &s->async->cmd;
-       int i, range;
-       unsigned char chanlo, chanhi, status;
+       int range;
+       unsigned char chanlo, chanhi;
+       int ret;
 
        if (!cmd->chanlist)
                return -EINVAL;
@@ -439,14 +447,13 @@ static int dmm32at_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
                                                      * isr */
        }
 
-       /* wait for circuit to settle */
-       for (i = 0; i < 40000; i++) {
-               status = inb(dev->iobase + DMM32AT_AIRBACK);
-               if ((status & DMM32AT_STATUS) == 0)
-                       break;
-       }
-       if (i == 40000)
-               return -ETIMEDOUT;
+       /*
+        * wait for circuit to settle
+        * we don't have the 'insn' here but it's not needed
+        */
+       ret = comedi_timeout(dev, s, NULL, dmm32at_ai_status, DMM32AT_AIRBACK);
+       if (ret)
+               return ret;
 
        if (devpriv->ai_scans_left > 1) {
                /* start the clock and enable the interrupts */
@@ -525,6 +532,19 @@ static irqreturn_t dmm32at_isr(int irq, void *d)
        return IRQ_HANDLED;
 }
 
+static int dmm32at_ao_eoc(struct comedi_device *dev,
+                         struct comedi_subdevice *s,
+                         struct comedi_insn *insn,
+                         unsigned long context)
+{
+       unsigned char status;
+
+       status = inb(dev->iobase + DMM32AT_DACSTAT);
+       if ((status & DMM32AT_DACBUSY) == 0)
+               return 0;
+       return -EBUSY;
+}
+
 static int dmm32at_ao_winsn(struct comedi_device *dev,
                            struct comedi_subdevice *s,
                            struct comedi_insn *insn, unsigned int *data)
@@ -533,6 +553,7 @@ static int dmm32at_ao_winsn(struct comedi_device *dev,
        int i;
        int chan = CR_CHAN(insn->chanspec);
        unsigned char hi, lo, status;
+       int ret;
 
        /* Writing a list of values to an AO channel is probably not
         * very useful, but that's how the interface is defined. */
@@ -549,13 +570,9 @@ static int dmm32at_ao_winsn(struct comedi_device *dev,
                outb(hi, dev->iobase + DMM32AT_DACMSB);
 
                /* wait for circuit to settle */
-               for (i = 0; i < 40000; i++) {
-                       status = inb(dev->iobase + DMM32AT_DACSTAT);
-                       if ((status & DMM32AT_DACBUSY) == 0)
-                               break;
-               }
-               if (i == 40000)
-                       return -ETIMEDOUT;
+               ret = comedi_timeout(dev, s, insn, dmm32at_ao_eoc, 0);
+               if (ret)
+                       return ret;
 
                /* dummy read to update trigger the output */
                status = inb(dev->iobase + DMM32AT_DACMSB);