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UCSI - USB Type-C Connector System Software Interface - is a specification that defines set of registers and data structures for controlling the USB Type-C ports. It's designed for systems where an embedded controller (EC) is in charge of the USB Type-C PHY or USB Power Delivery controller. It is designed for systems with EC, but it is not limited to them, and for example some USB Power Delivery controllers will use it as their direct control interface. With UCSI the EC (or USB PD controller) acts as the port manager, implementing all USB Type-C and Power Delivery state machines. The OS can use the interfaces for reading the status of the ports and controlling basic operations like role swapping. The UCSI specification highlights the fact that it does not define the interface method (PCI/I2C/ACPI/etc.). Therefore the driver is implemented as library and every supported interface method needs its own driver. Driver for ACPI is provided in separate patch following this one. The initial driver includes support for all required features from UCSI specification version 1.0 (getting connector capabilities and status, and support for power and data role swapping), but none of the optional UCSI features (alternate modes, power source capabilities, and cable capabilities). Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.