CIO_DAC_EXTENT
if (!devm_request_region(dev, base[id], CIO_DAC_EXTENT,
base[id], base[id] + CIO_DAC_EXTENT);
regs = devm_ioport_map(dev, base[id], CIO_DAC_EXTENT);
static unsigned int base[max_num_isa_dev(CIO_DAC_EXTENT)];