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The ADLink PCI-7250, LPCI-7250, and LPCIe-7250 are PCI/PCIe boards with 8 relay outputs and 8 isolated digital inputs. Add a new Comedi driver "adl_pci7250" to support them. It is possible to add up to three PCI-7251 plug-in modules to the PCI-7250, with 8 relay outputs and 8 isolated digital inputs per plug-in module. We cannot reliably detect whether the modules are fitted without changing their state. It is harmless to assume the modules are fitted; they just won't do anything, so the driver allows all 32 relay outputs to be written (and their initial state to be read), and all 32 digital inputs to be read. The LPCI-7250 and LPCIe-7250 are low-profile boards that do not support the plug-in modules, but except for a newer variant of the LPCIe-7250, they cannot be distinguished from the full-height boards by their PCI IDs. For the newer variant of the LPCIe-7250, we can assume that there are no plug-in modules fitted and limit the number of channels accordingly. This newer variant of the LPCIe-7250 uses memory-mapped registers, whereas all the other boards use port-mapped registers. I have tested the PCI-7250. The new variant of the LPCIe-7250 has been tested in an out-of-tree version of the Comedi drivers by someone else. Tested-by: Ian Abbott <abbotti@mev.co.uk> # PCI-7250 only Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Link: https://lore.kernel.org/r/20250821145914.10445-1-abbotti@mev.co.uk Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.