read_subdevice    816 drivers/staging/comedi/comedi.h 	int read_subdevice;
read_subdevice    945 drivers/staging/comedi/comedi_fops.c 		devinfo.read_subdevice = s->index;
read_subdevice    947 drivers/staging/comedi/comedi_fops.c 		devinfo.read_subdevice = -1;