ACPI / SBS: Don't assume the existence of an SBS charger

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Apple hardware continues to expose an ACPI AC charger even when using
SBS to report battery state. The charger status byte returns all 0s in
this case.  Since the spec requires that bit 4 be 1 at all times, assume
that there's not really a charger if it's set to zero.

Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

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Matthew Garrett 2014-09-20 13:19:45 +02:00 • committed by Rafael J. Wysocki

parent 0f33be009b

commit 3031cddea6

1 changed files with 22 additions and 7 deletions

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drivers/acpi/sbs.c

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