1aa4c85bab
The Surface System Aggregator Module (SSAM) has multiple subsystems that can manage detachable devices. At the moment, we only support the "base" (BAS/0x11) subsystem, which is used on the Surface Book 3 to manage devices (including keyboard, touchpad, and secondary battery) connected to the base of the device. The Surface Pro 8 has a new type-cover with keyboard and touchpad, which is managed via the KIP/0x0e subsystem. The general procedure is the same, but with slightly different events and setup. To make implementation of the KIP hub easier and prevent duplication, generify the parts of the base hub that we can use for the KIP hub (or any potential future subsystem hubs). This also switches over to use the newly introduced "hot-remove" functionality, which should prevent communication issues when devices have been detached. Lastly, also drop the undocumented and unused sysfs "state" attribute of the base hub. It has at best been useful for debugging. Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com> Link: https://lore.kernel.org/r/20220527023447.2460025-10-luzmaximilian@gmail.com Reviewed-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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.