Enumerator at drivers/staging/comedi/comedi.h, line 233 References: drivers/staging/comedi/comedi.h, line 233 drivers/staging/comedi/drivers/addi_apci_1564.c, line 532 drivers/staging/comedi/drivers/adv_pci_dio.c, line 871 drivers/staging/comedi/drivers/c6xdigio.c, line 277 drivers/staging/comedi/drivers/comedi_8254.c, line 571 drivers/staging/comedi/drivers/icp_multi.c, line 520 drivers/staging/comedi/drivers/ke_counter.c, line 186 drivers/staging/comedi/drivers/multiq3.c, line 267 drivers/staging/comedi/drivers/ni_660x.c, line 1112 drivers/staging/comedi/drivers/ni_usb6501.c, line 557 drivers/staging/comedi/drivers/rtd520.c, line 1276 drivers/staging/comedi/drivers/s526.c, line 557 drivers/staging/comedi/drivers/s626.c, line 2846 drivers/staging/comedi/drivers/serial2002.c, line 763 drivers/staging/comedi/drivers/usbdux.c, line 1674 drivers/staging/comedi/drivers/vmk80xx.c, line 763