staging: comedi: das800: clarify 8254 timer programming
Refactor the 8254 timer programming to use the i8254_set_mode()
and i8254_write() helpers instead of i8254_load(). This allows
us to use the I8254_MODE* defines to clarify the code.
The das800_set_frequency() function will not fail. For aesthetics
change the return to a void and remove the error handling.
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/das800.c b/drivers/staging/comedi/drivers/das800.c
index e2dc43d..615ae3f 100644
--- a/drivers/staging/comedi/drivers/das800.c
+++ b/drivers/staging/comedi/drivers/das800.c
@@ -275,19 +275,15 @@
spin_unlock_irqrestore(&dev->spinlock, irq_flags);
}
-static int das800_set_frequency(struct comedi_device *dev)
+static void das800_set_frequency(struct comedi_device *dev)
{
struct das800_private *devpriv = dev->private;
- int err = 0;
+ unsigned long timer_base = dev->iobase + DAS800_8254;
- if (i8254_load(dev->iobase + DAS800_8254, 0, 1, devpriv->divisor1, 2))
- err++;
- if (i8254_load(dev->iobase + DAS800_8254, 0, 2, devpriv->divisor2, 2))
- err++;
- if (err)
- return -1;
-
- return 0;
+ i8254_set_mode(timer_base, 0, 1, I8254_MODE2 | I8254_BINARY);
+ i8254_set_mode(timer_base, 0, 2, I8254_MODE2 | I8254_BINARY);
+ i8254_write(timer_base, 0, 1, devpriv->divisor1);
+ i8254_write(timer_base, 0, 2, devpriv->divisor2);
}
static int das800_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
@@ -448,10 +444,7 @@
if (async->cmd.convert_src == TRIG_TIMER) {
conv_bits |= CASC | ITE;
/* set conversion frequency */
- if (das800_set_frequency(dev) < 0) {
- comedi_error(dev, "Error setting up counters");
- return -1;
- }
+ das800_set_frequency(dev);
}
spin_lock_irqsave(&dev->spinlock, irq_flags);