Hey,
I want to get devd notifications when my laptop battery reaches a certain
battery level.
This is done with the optional _BTP acpi method.
It's almost trivial. It is a write-only method. You call:
ACPI_STATUS as = acpi_SetInteger(h, "_BTP", new_trip_point);
But I wonder:
1. Is there a proper way to check whether an acpi method exists? Linux source
code
has a function acpi_has_method(battery->device->handle, "_BTP").
Is there an equivalent in FreeBSD?
Or would this be viable?
ACPI_STATUS as = acpi_SetInteger(h, "_BTP", new_trip_point);
if( as == AE_NOT_FOUND )
/* _BTP not implemented */
else if (ACPI_FAILURE(as) )
/* some other error */
else
/* we have _BTP */
2. Is dev.battery.0.btp the right place to implement a sysctl? It doesn't make
much
sense to send it through the abstraction layer (hw.acpi.battery), because only
control method batteries
support this feature.
Thanks for helping me!
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