[PATCH v1 0/2] Read _SUB from ACPI to be able to identify firmware

Stefan Binding
2022-06-22T13:08:20Z

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.

Stefan Binding (2):
ACPI: utils: Add api to read _SUB from ACPI
ASoC: cs35l41: Read System Name from ACPI _SUB to identify firmware

drivers/acpi/utils.c | 26 ++++++++++++++++++++++++++
include/linux/acpi.h | 8 ++++++++
sound/soc/codecs/cs35l41.c | 27 +++++++++++++++++++++++++++
3 files changed, 61 insertions(+)

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2.25.1