dt2801_writedata
ret = dt2801_writedata(dev, data & 0xff);
ret = dt2801_writedata(dev, data >> 8);
dt2801_writedata(dev, 0);
dt2801_writedata(dev, n_chans);
dt2801_writedata(dev, CR_RANGE(insn->chanspec));
dt2801_writedata(dev, CR_CHAN(insn->chanspec));
dt2801_writedata(dev, chan);
dt2801_writedata(dev, which);
dt2801_writedata(dev, s->state);
dt2801_writedata(dev, which);
dt2801_writedata(dev, (s == &dev->subdevices[3]) ? 1 : 0);