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ce38f3fc0f
x86 ACPI boards which ship with only Android as their factory image may have pretty broken ACPI tables. This includes broken _AEI ACPI GPIO event handlers, which are normally used to listen to the micro-USB ID pin and: 1. Switch the USB-mux to the host / device USB controllers 2. Disable Vbus path before enabling the 5V boost (AXP reg 0x30 bit 7) 3. Turn 5V Vboost on / off On non broken systems where this is not done through an ACPI GPIO event handler, there is an ACPI INT3496 device describing the involved GPIOs which are handled by the extcon-intel-int3496 driver; and axp288-charger.ko listens to this extcon-device and disables the Vbus path when necessary. On x86 Android boards, with broken ACPI GPIO event handlers, these are disabled by acpi_quirk_skip_gpio_event_handlers() and an intel-int3496 extcon device is manually instantiated by x86-android-tablets.ko . Add support to the axp288-charger code for this setup, so that it properly disables the Vbus path when necessary. Note this uses acpi_quirk_skip_gpio_event_handlers() to identify these systems, to avoid the need to add a separate DMI match table for this. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com> |
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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.