This series of patches adds a couple of ioctl codes to the Comedi core to allow the current "read" and "write" subdevice to be changed after opening the comedi device. The current read and write subdevice information is stored in file private data allocated for the lifetime of the file object, so the notion of current "read" and "write" subdevice is local to the file object and does not alter anything in the main control structure for the comedi device. An extra level of indirection is now required to access the main control structure. I've tested the multiple "read" subdevice case using a modified version of the "comedi_test" module (modifying it to clone the existing AI subdevice), and a modified version of the "comedi_test" application (part of the "comedilib" installation) modified to use the new ioctls. There isn't any support in comedilib itself yet. 1) staging: comedi: prepare support for per-file read and write subdevices 2) staging: comedi: add ioctls to set per-file read and write subdevice drivers/staging/comedi/comedi.h | 2 + drivers/staging/comedi/comedi_compat32.c | 2 + drivers/staging/comedi/comedi_fops.c | 217 +++++++++++++++++++++++++++---- 3 files changed, 196 insertions(+), 25 deletions(-) _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
