Read _SUB from ACPI to be able to identify firmware

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Merge series from Stefan Binding <sbinding@opensource.cirrus.com>:

CS35L41 has a DSP which is able to run firmware, as well as a tuning file.
Different systems may want to use different firmwares and tuning files, and
some firmwares/tunings may not be compatible with other systems.
To allow a system to select the correct fimware/tuning, we can read an _SUB
from the ACPI. This _SUB can then be used to uniquely identify the system
in the firmware/tuning file name.

Add a helper function which reads the _SUB, so this can be used by other
parts in the future.
Add support inside the CS35L41 ASoC driver to read this _SUB, and save it
appropriately.

...

This commit is contained in:

Mark Brown 2022-07-15 18:21:09 +01:00

parent e1d1ffeda6 c1ad138822

commit 1c69bbc3c1

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38

drivers/acpi/utils.c

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6

include/linux/acpi.h

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30

sound/soc/codecs/cs35l41.c

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