prev_bipolar 1412 drivers/staging/comedi/drivers/amplc_pci230.c bool prev_bipolar = false; prev_bipolar 1453 drivers/staging/comedi/drivers/amplc_pci230.c if (bipolar != prev_bipolar) { prev_bipolar 1471 drivers/staging/comedi/drivers/amplc_pci230.c prev_bipolar = bipolar;