fc622b3d36
The Surface System Aggregator Module (SSAM) subsystem provides various functionalities, which are separated by spreading them across multiple devices and corresponding drivers. Parts of that functionality / some of those devices, however, can (as far as we currently know) not be auto-detected by conventional means. While older (specifically 5th- and 6th-)generation models do advertise most of their functionality via standard platform devices in ACPI, newer generations do not. As we are currently also not aware of any feasible way to query said functionalities dynamically, this poses a problem. There is, however, a device in ACPI that seems to be used by Windows for identifying different Surface models: The Windows Surface Integration Device (WSID). This device seems to have a HID corresponding to the overall set of functionalities SSAM provides for the associated model. This commit introduces a registry providing non-detectable device information via software nodes. In addition, a SSAM platform hub driver is introduced, which takes care of creating and managing the SSAM devices specified in this registry. This approach allows for a hierarchical setup akin to ACPI and is easily extendable, e.g. via firmware node properties. Note that this commit only provides the basis for the platform hub and registry, and does not add any content to it. The registry will be expanded in subsequent commits. Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com> Link: https://lore.kernel.org/r/20210212115439.1525216-2-luzmaximilian@gmail.com Signed-off-by: Hans de Goede <hdegoede@redhat.com> |
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
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| COPYING | ||
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| Kbuild | ||
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| README | ||
README
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 Restructured Text 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.