Revert "staging: comedi: core: introduce comedi_dio_insn_config()"

This reverts commit 4f76463d.

I applied an incorrect version here as well :(

Cc: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/comedidev.h

@@ -342,10 +342,6 @@ void comedi_buf_memcpy_from(struct comedi_async *async, unsigned int offset,
 
 /* drivers.c - general comedi driver functions */
 
-int comedi_dio_insn_config(struct comedi_device *, struct comedi_subdevice *,
-			   struct comedi_insn *, unsigned int *data,
-			   unsigned int mask);
-
 void *comedi_alloc_devpriv(struct comedi_device *, size_t);
 int comedi_alloc_subdevices(struct comedi_device *, int);
 

drivers/staging/comedi/drivers.c

@@ -150,46 +150,6 @@ int insn_inval(struct comedi_device *dev, struct comedi_subdevice *s,
 	return -EINVAL;
 }
 
-/**
- * comedi_dio_insn_config() - boilerplate (*insn_config) for DIO subdevices.
- * @dev: comedi_device struct
- * @s: comedi_subdevice struct
- * @insn: comedi_insn struct
- * @data: parameters for the @insn
- * @mask: io_bits mask for grouped channels
- */
-int comedi_dio_insn_config(struct comedi_device *dev,
-			   struct comedi_subdevice *s,
-			   struct comedi_insn *insn,
-			   unsigned int *data,
-			   unsigned int mask)
-{
-	unsigned int chan_mask = 1 << CR_CHAN(insn->chanspec);
-
-	if (!mask)
-		mask = chan_mask;
-
-	switch (data[0]) {
-	case INSN_CONFIG_DIO_INPUT:
-		s->io_bits &= ~mask;
-		break;
-
-	case INSN_CONFIG_DIO_OUTPUT:
-		s->io_bits |= mask;
-		break;
-
-	case INSN_CONFIG_DIO_QUERY:
-		data[1] = (s->io_bits & mask) ? COMEDI_OUTPUT : COMEDI_INPUT;
-		return insn->n;
-
-	default:
-		return -EINVAL;
-	}
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(comedi_dio_insn_config);
-
 static int insn_rw_emulate_bits(struct comedi_device *dev,
 				struct comedi_subdevice *s,
 				struct comedi_insn *insn, unsigned int *data)