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Tomasz Pakuła 66be625a93 HID: pidff: Use direction fix only for conditional effects 
[ Upstream commit f345a4798d ]

The already fixed bug in SDL only affected conditional effects. This
should fix FFB in Forza Horizion 4/5 on Moza Devices as Forza Horizon
flips the constant force direction instead of using negative magnitude
values.

Changing the direction in the effect directly in pidff_upload_effect()
would affect it's value in further operations like comparing to the old
effect and/or just reading the effect values in the user application.

This, in turn, would lead to constant PID_SET_EFFECT spam as the effect
direction would constantly not match the value that's set by the
application.

This way, it's still transparent to any software/API.

Only affects conditional effects now so it's better for it to explicitly
state that in the name. If any HW ever needs fixed direction for other
effects, we'll add more quirks.

Signed-off-by: Tomasz Pakuła <tomasz.pakula.oficjalny@gmail.com>
Reviewed-by: Oleg Makarenko <oleg@makarenk.ooo>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-11-13 15:37:02 -05:00
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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 reStructuredText 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.