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[ Upstream commit f16d9fb6cf03fdbdefa41a8b32ba1e57afb7ae3d ] Multiple applications may access the battery gauge at the same time, so the gauge may be busy and EBUSY will be returned. The driver will set a flag to record the EBUSY state, and this flag will be kept until the next periodic update. When this flag is set, bq27xxx_battery_get_property() will just return ENODEV until the flag is updated. Even if the gauge was busy during the last accessing attempt, returning ENODEV is not ideal, and can cause confusion in the applications layer. Instead, retry accessing the I2C to update the flag is as expected, for the gauge typically recovers from busy state within a few milliseconds. If still failed to access the gauge, the real error code would be returned instead of ENODEV (as suggested by Pali Rohár). Reviewed-by: Pali Rohár <pali@kernel.org> Signed-off-by: Jerry Lv <Jerry.Lv@axis.com> Link: https://lore.kernel.org/r/20250415-foo-fix-v2-1-5b45a395e4cc@axis.com Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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| 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 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.