kernel/linux.git/drivers/comedi/kcomedilib, branch linux-7.1.y

comedi: remove unnecessary module_init/exit functions

2026-04-02T13:49:54+00:00

Many Comedi drivers have unnecessary empty module_init and module_exit functions. Remove them. Note that if a module_init function exists, a module_exit function must also exist; otherwise, the module cannot be unloaded. Signed-off-by: Ethan Nelson-Moore Reviewed-by: Ian Abbott Link: https://patch.msgid.link/20260131013810.32265-1-enelsonmoore@gmail.com Signed-off-by: Greg Kroah-Hartman

comedi: kcomedilib: Add loop checking variants of open and close

2025-11-26T13:20:10+00:00

Add `comedi_open_from(path, from)` and `comedi_close_from(dev, from)` as variants of the existing `comedi_from(path)` and `comedi_close(dev)`. The additional `from` parameter is a minor device number that tells the function that the COMEDI device is being opened or closed from another COMEDI device if the value is in the range [0, `COMEDI_NUM_BOARD_MINORS`-1]. In that case the function will refuse to open the device if it would lead to a chain of devices opening each other. (It will also impose a limit on the number of simultaneous opens from one device to another because we need to count those.) The new functions are intended to be used by the "comedi_bond" driver, which is the only driver that uses the existing `comedi_open()` and `comedi_close()` functions. The new functions will be used to avoid some possible deadlock situations. Replace the existing, exported `comedi_open()` and `comedi_close()` functions with inline wrapper functions that call the newly exported `comedi_open_from()` and `comedi_close_from()` functions. Signed-off-by: Ian Abbott Link: https://patch.msgid.link/20251027153748.4569-2-abbotti@mev.co.uk Signed-off-by: Greg Kroah-Hartman

comedi: Move the main COMEDI headers

2021-11-26T15:48:59+00:00

Move the main COMEDI driver headers out of "drivers/comedi/" into new directory "include/linux/comedi/". These are "comedidev.h", "comedilib.h", "comedi_pci.h", "comedi_pcmcia.h", and "comedi_usb.h". Additionally, move the user-space API header "comedi.h" into "include/uapi/linux/" and add "WITH Linux-syscall-note" to its SPDX-License-Identifier. Update the "COMEDI DRIVERS" section of the MAINTAINERS file to account for these changes. Signed-off-by: Ian Abbott Link: https://lore.kernel.org/r/20211117120604.117740-2-abbotti@mev.co.uk Signed-off-by: Greg Kroah-Hartman

staging: comedi: move out of staging directory

2021-04-15T07:26:25+00:00

The comedi code came into the kernel back in 2008, but traces its lifetime to much much earlier. It's been polished and buffed and there's really nothing preventing it from being part of the "real" portion of the kernel. So move it to drivers/comedi/ as it belongs there. Many thanks to the hundreds of developers who did the work to make this happen. Cc: Ian Abbott Cc: H Hartley Sweeten Link: https://lore.kernel.org/r/YHauop4u3sP6lz8j@kroah.com Signed-off-by: Greg Kroah-Hartman