staging: comedi: dt2817: fix dt2817_dio_insn_config()

This is the (*insn_config) function for a DIO subdevice. It should be
using the data[0] value as the "instruction" to perform on the subdevice.

Use the comedi_dio_insn_config() helper to properly handle instructions.

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/dt2817.c b/drivers/staging/comedi/drivers/dt2817.c
index 51cf1211f1ba694183817f8f3a7a2f8a0de5bd57..f4a8529239b5448b5fe5c9a317b0dfaf1146bc46 100644 (file)
--- a/drivers/staging/comedi/drivers/dt2817.c
+++ b/drivers/staging/comedi/drivers/dt2817.c
@@ -43,28 +43,26 @@ Configuration options:
 
 static int dt2817_dio_insn_config(struct comedi_device *dev,
                                  struct comedi_subdevice *s,
-                                 struct comedi_insn *insn, unsigned int *data)
+                                 struct comedi_insn *insn,
+                                 unsigned int *data)
 {
-       int mask;
-       int chan;
-       int oe = 0;
-
-       if (insn->n != 1)
-               return -EINVAL;
+       unsigned int chan = CR_CHAN(insn->chanspec);
+       unsigned int oe = 0;
+       unsigned int mask;
+       int ret;
 
-       chan = CR_CHAN(insn->chanspec);
        if (chan < 8)
-               mask = 0xff;
+               mask = 0x000000ff;
        else if (chan < 16)
-               mask = 0xff00;
+               mask = 0x0000ff00;
        else if (chan < 24)
-               mask = 0xff0000;
+               mask = 0x00ff0000;
        else
                mask = 0xff000000;
-       if (data[0])
-               s->io_bits |= mask;
-       else
-               s->io_bits &= ~mask;
+
+       ret = comedi_dio_insn_config(dev, s, insn, data, mask);
+       if (ret)
+               return ret;
 
        if (s->io_bits & 0x000000ff)
                oe |= 0x1;
@@ -77,7 +75,7 @@ static int dt2817_dio_insn_config(struct comedi_device *dev,
 
        outb(oe, dev->iobase + DT2817_CR);
 
-       return 1;
+       return insn->n;
 }
 
 static int dt2817_dio_insn_bits(struct comedi_device *dev,