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61f363a625
The Samsung Galaxy A3/A5 both have two capacitive touch keys, connected to an ABOV MCU. It implements the same interface as implemented by the tm2-touchkey driver and works just fine with the coreriver,tc360-touchkey compatible. It's probably actually some Samsung-specific interface that they implement with different MCUs. Note that for some reason Samsung decided to connect this to GPIOs where no hardware I2C bus is available, so we need to fall back to software bit-banging using i2c-gpio. The vdd/vcc-supply is board-specific and will be added separately for a3u/a5u. Co-developed-by: Michael Srba <Michael.Srba@seznam.cz> Signed-off-by: Michael Srba <Michael.Srba@seznam.cz> Signed-off-by: Stephan Gerhold <stephan@gerhold.net> Link: https://lore.kernel.org/r/20210604172742.10593-1-stephan@gerhold.net Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.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 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.