CR_PACK
devpriv->last_ai_chanspec = CR_PACK(16, 0, 0);
pcl812_ai_set_chan_range(dev, CR_PACK(0, 0, 0), 0);
unsigned int chanspec = CR_PACK(0, 0, AREF_GROUND);
insn.chanspec = CR_PACK(chan, 0, 0);
insn.chanspec = CR_PACK(chan, 0, 0);
(CR_PACK(chan, range, aref) | ((flags) & CR_FLAGS_MASK))