devpriv->iobase + ((data[5] - 1) * 0x20) +
                        APCI1564_TCW_PROG);
        } else {
-               printk(" Invalid subdevice.");
+               dev_err(dev->class_dev, "Invalid subdevice.\n");
        }
 
        return insn->n;
                                APCI1564_TCW_PROG);
                        break;
                default:
-                       printk("\nSpecified functionality does not exist\n");
+                       dev_err(dev->class_dev, "Specified functionality does not exist.\n");
                        return -EINVAL;
                }
        }
        } else if ((devpriv->b_TimerSelectMode != ADDIDATA_TIMER)
                && (devpriv->b_TimerSelectMode != ADDIDATA_WATCHDOG)
                && (devpriv->b_TimerSelectMode != ADDIDATA_COUNTER)) {
-               printk("\n Invalid Subdevice !!!\n");
+               dev_err(dev->class_dev, "Invalid Subdevice!\n");
        }
        return insn->n;
 }
                APCI1564_TCW_IRQ) & 0x1;
        if (ui_DI == 0 && ui_DO == 0 && ui_Timer == 0 && ui_C1 == 0
                && ui_C2 == 0 && ui_C3 == 0 && ui_C4 == 0) {
-               printk("\nInterrupt from unknown source\n");
+               dev_err(dev->class_dev, "Interrupt from unknown source.\n");
        }
 
        if (ui_DI == 1) {