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platform/x86: simatic-ipc: add CMOS battery monitoring

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Siemens Simatic Industrial PCs can monitor the voltage of the CMOS
battery with two bits that indicate low or empty state. This can be GPIO
or PortIO based.
Here we model that as a hwmon voltage. The core driver does the PortIO
and provides boilerplate for the GPIO versions. Which are split out to
model runtime dependencies while allowing fine-grained kernel
configuration.

Signed-off-by: Henning Schild <henning.schild@siemens.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20230706154831.19100-3-henning.schild@siemens.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Henning Schild 2023-07-06 17:48:31 +02:00 • committed by Hans de Goede
commit 917f543407
9 changed files with 549 additions and 15 deletions
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