diff options
Diffstat (limited to 'drivers/staging/comedi/drivers/amplc_dio200_common.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/amplc_dio200_common.c | 33 |
1 files changed, 17 insertions, 16 deletions
diff --git a/drivers/staging/comedi/drivers/amplc_dio200_common.c b/drivers/staging/comedi/drivers/amplc_dio200_common.c index c1f723e86146..2e4bf284d52c 100644 --- a/drivers/staging/comedi/drivers/amplc_dio200_common.c +++ b/drivers/staging/comedi/drivers/amplc_dio200_common.c @@ -941,31 +941,34 @@ static void dio200_subdev_8255_set_dir(struct comedi_device *dev, dio200_write8(dev, subpriv->ofs + 3, config); } -/* - * Handle 'insn_bits' for an '8255' DIO subdevice. - */ static int dio200_subdev_8255_bits(struct comedi_device *dev, struct comedi_subdevice *s, - struct comedi_insn *insn, unsigned int *data) + struct comedi_insn *insn, + unsigned int *data) { struct dio200_subdev_8255 *subpriv = s->private; + unsigned int mask; + unsigned int val; - if (data[0]) { - s->state &= ~data[0]; - s->state |= (data[0] & data[1]); - if (data[0] & 0xff) + mask = comedi_dio_update_state(s, data); + if (mask) { + if (mask & 0xff) dio200_write8(dev, subpriv->ofs, s->state & 0xff); - if (data[0] & 0xff00) + if (mask & 0xff00) dio200_write8(dev, subpriv->ofs + 1, (s->state >> 8) & 0xff); - if (data[0] & 0xff0000) + if (mask & 0xff0000) dio200_write8(dev, subpriv->ofs + 2, (s->state >> 16) & 0xff); } - data[1] = dio200_read8(dev, subpriv->ofs); - data[1] |= dio200_read8(dev, subpriv->ofs + 1) << 8; - data[1] |= dio200_read8(dev, subpriv->ofs + 2) << 16; - return 2; + + val = dio200_read8(dev, subpriv->ofs); + val |= dio200_read8(dev, subpriv->ofs + 1) << 8; + val |= dio200_read8(dev, subpriv->ofs + 2) << 16; + + data[1] = val; + + return insn->n; } /* @@ -1022,8 +1025,6 @@ static int dio200_subdev_8255_init(struct comedi_device *dev, s->maxdata = 1; s->insn_bits = dio200_subdev_8255_bits; s->insn_config = dio200_subdev_8255_config; - s->state = 0; - s->io_bits = 0; dio200_subdev_8255_set_dir(dev, s); return 0; } |