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power_supply: add CHARGE_COUNTER property and olpc_battery support for it

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This adds PROP_CHARGE_COUNTER to the power supply class (documenting it
as well).  The OLPC battery driver uses this for spitting out its ACR
values (in uAh).  We have some rounding errors (the data sheet claims
416.7, the math actually works out to 416.666667, so we're forced to
choose between overflows or precision loss.  I chose precision loss,
and stuck w/ data sheet values), but I don't think anyone will care
that much.

Signed-off-by: Andres Salomon <[email protected]>
Signed-off-by: Anton Vorontsov <[email protected]>
This commit is contained in:
Andres Salomon 2008-05-12 21:46:29 -04:00 • committed by Anton Vorontsov
commit 8e552c36d9
4 changed files with 16 additions and 1 deletions
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4
Documentation/power/power_supply_class.txt
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@ -101,6 +101,10 @@ of charge when battery became full/empty". It also could mean "value of
charge when battery considered full/empty at given conditions (temperature,
age)". I.e. these attributes represents real thresholds, not design values.
CHARGE_COUNTER - the current charge counter (in µAh). This could easily
be negative; there is no empty or full value. It is only useful for
relative, time-based measurements.
ENERGY_FULL, ENERGY_EMPTY - same as above but for energy.
CAPACITY - capacity in percents.