kern/58695: acpibat(4) fails to expose battery model/serial/type/oem

[campbell+netbsd%mumble.net@localhost]

>Number:         58695
>Category:       kern
>Synopsis:       acpibat(4) fails to expose battery model/serial/type/oem
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Sep 25 12:35:00 +0000 2024
>Originator:     Taylor R Campbell
>Release:        current, 10, 9, ...
>Organization:
The NetBatteryD Foundation
>Environment:
>Description:
The _BIF and _BIX methods of ACPI PNP0C0A battery devices return information about battery model number, serial number, batter type, and OEM information:

https://uefi.org/htmlspecs/ACPI_Spec_6_4_html/10_Power_Source_and_Power_Meter_Devices/Power_Source_and_Power_Meter_Devices.html#bif-battery-information
https://uefi.org/htmlspecs/ACPI_Spec_6_4_html/10_Power_Source_and_Power_Meter_Devices/Power_Source_and_Power_Meter_Devices.html#bix-battery-information-extended

However, NetBSD appears to ignore these and doesn't expose them anywhere.
>How-To-Repeat:
try to find battery model/serial/type/oem
>Fix:
Yes, please!

1. Print it in dmesg.
2. Create sysctl nodes for it.