Describe how the comedi minor device numbers are split across comedi devices and comedi subdevices. Replace the current, long dead URL with an official URL for the Comedi project. Signed-off-by: Ian Abbott <abbotti@xxxxxxxxx> --- Documentation/admin-guide/devices.txt | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/Documentation/admin-guide/devices.txt b/Documentation/admin-guide/devices.txt index e56e00655153..1c5d2281efc9 100644 --- a/Documentation/admin-guide/devices.txt +++ b/Documentation/admin-guide/devices.txt @@ -1647,8 +1647,17 @@ 0 = /dev/comedi0 First comedi device 1 = /dev/comedi1 Second comedi device ... + 47 = /dev/comedi47 48th comedi device - See http://stm.lbl.gov/comedi. + Minors 48 to 255 are reserved for comedi subdevices with + pathnames of the form "/dev/comediX_subdY", where "X" is the + minor number of the associated comedi device and "Y" is the + subdevice number. These subdevice minors are assigned + dynamically, so there is no fixed mapping from subdevice + pathnames to minor numbers. + + See http://www.comedi.org/ for information about the Comedi + project. 98 block User-mode virtual block device 0 = /dev/ubda First user-mode block device -- 2.23.0
