Use the subdevice 'state' variable instead of carrying the state of
the output channels in the private data.
Use comedi_dio_update_state() to handle the boilerplate code to update
the subdevice s->state.
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/das1800.c | 22 ++++++----------------
1 file changed, 6 insertions(+), 16 deletions(-)
diff --git a/drivers/staging/comedi/drivers/das1800.c
b/drivers/staging/comedi/drivers/das1800.c
index 5b30029..8b9a0a6 100644
--- a/drivers/staging/comedi/drivers/das1800.c
+++ b/drivers/staging/comedi/drivers/das1800.c
@@ -427,7 +427,6 @@ struct das1800_private {
volatile unsigned int count; /* number of data points left to be
taken */
unsigned int divisor1; /* value to load into board's counter 1 for
timed conversions */
unsigned int divisor2; /* value to load into board's counter 2 for
timed conversions */
- int do_bits; /* digital output bits */
int irq_dma_bits; /* bits for control register b */
/* dma bits for control register b, stored so that dma can be
* turned on and off */
@@ -1319,24 +1318,15 @@ static int das1800_di_rbits(struct comedi_device *dev,
return insn->n;
}
-/* writes to digital output channels */
static int das1800_do_wbits(struct comedi_device *dev,
struct comedi_subdevice *s,
- struct comedi_insn *insn, unsigned int *data)
+ struct comedi_insn *insn,
+ unsigned int *data)
{
- struct das1800_private *devpriv = dev->private;
- unsigned int wbits;
-
- /* only set bits that have been masked */
- data[0] &= (1 << s->n_chan) - 1;
- wbits = devpriv->do_bits;
- wbits &= ~data[0];
- wbits |= data[0] & data[1];
- devpriv->do_bits = wbits;
-
- outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
+ if (comedi_dio_update_state(s, data))
+ outb(s->state, dev->iobase + DAS1800_DIGITAL);
- data[1] = devpriv->do_bits;
+ data[1] = s->state;
return insn->n;
}
@@ -1644,7 +1634,7 @@ static int das1800_attach(struct comedi_device *dev,
das1800_cancel(dev, dev->read_subdev);
/* initialize digital out channels */
- outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
+ outb(0, dev->iobase + DAS1800_DIGITAL);
/* initialize analog out channels */
if (thisboard->ao_ability == 1) {
--
1.8.3.2
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