diff options
Diffstat (limited to 'drivers/staging/comedi/drivers/dt2817.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/dt2817.c | 51 |
1 files changed, 23 insertions, 28 deletions
diff --git a/drivers/staging/comedi/drivers/dt2817.c b/drivers/staging/comedi/drivers/dt2817.c index f4a8529239b5..bf589936e546 100644 --- a/drivers/staging/comedi/drivers/dt2817.c +++ b/drivers/staging/comedi/drivers/dt2817.c @@ -80,36 +80,31 @@ static int dt2817_dio_insn_config(struct comedi_device *dev, static int dt2817_dio_insn_bits(struct comedi_device *dev, struct comedi_subdevice *s, - struct comedi_insn *insn, unsigned int *data) + struct comedi_insn *insn, + unsigned int *data) { - unsigned int changed; - - /* It's questionable whether it is more important in - * a driver like this to be deterministic or fast. - * We choose fast. */ - - if (data[0]) { - changed = s->state; - s->state &= ~data[0]; - s->state |= (data[0] & data[1]); - changed ^= s->state; - changed &= s->io_bits; - if (changed & 0x000000ff) - outb(s->state & 0xff, dev->iobase + DT2817_DATA + 0); - if (changed & 0x0000ff00) - outb((s->state >> 8) & 0xff, - dev->iobase + DT2817_DATA + 1); - if (changed & 0x00ff0000) - outb((s->state >> 16) & 0xff, - dev->iobase + DT2817_DATA + 2); - if (changed & 0xff000000) - outb((s->state >> 24) & 0xff, - dev->iobase + DT2817_DATA + 3); + unsigned long iobase = dev->iobase + DT2817_DATA; + unsigned int mask; + unsigned int val; + + mask = comedi_dio_update_state(s, data); + if (mask) { + if (mask & 0x000000ff) + outb(s->state & 0xff, iobase + 0); + if (mask & 0x0000ff00) + outb((s->state >> 8) & 0xff, iobase + 1); + if (mask & 0x00ff0000) + outb((s->state >> 16) & 0xff, iobase + 2); + if (mask & 0xff000000) + outb((s->state >> 24) & 0xff, iobase + 3); } - data[1] = inb(dev->iobase + DT2817_DATA + 0); - data[1] |= (inb(dev->iobase + DT2817_DATA + 1) << 8); - data[1] |= (inb(dev->iobase + DT2817_DATA + 2) << 16); - data[1] |= (inb(dev->iobase + DT2817_DATA + 3) << 24); + + val = inb(iobase + 0); + val |= (inb(iobase + 1) << 8); + val |= (inb(iobase + 2) << 16); + val |= (inb(iobase + 3) << 24); + + data[1] = val; return insn->n; } |