ADC_READ_PNTR_REG
read_index = readw(devpriv->main_iobase + ADC_READ_PNTR_REG) &
readw(devpriv->main_iobase + ADC_READ_PNTR_REG) & 0x7fff;
read_code = readw(devpriv->main_iobase + ADC_READ_PNTR_REG) &