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authorAndres Salomon <dilinger@debian.org>2008-05-13 05:46:29 +0400
committerAnton Vorontsov <cbouatmailru@gmail.com>2008-05-13 12:27:11 +0400
commit8e552c36d90c03d2cabf5373788998966751b609 (patch)
treec6707c58260ce932a1d2539f55f95ff5cacb8ba8 /Documentation/power/power_supply_class.txt
parent484d6d50cca3941db6e063113d124333aed0abc0 (diff)
downloadlinux-8e552c36d90c03d2cabf5373788998966751b609.tar.xz
power_supply: add CHARGE_COUNTER property and olpc_battery support for it
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 <dilinger@debian.org> Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
Diffstat (limited to 'Documentation/power/power_supply_class.txt')
-rw-r--r--Documentation/power/power_supply_class.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/power/power_supply_class.txt b/Documentation/power/power_supply_class.txt
index a8686e5a6857..c6cd4956047c 100644
--- a/Documentation/power/power_supply_class.txt
+++ b/Documentation/power/power_supply_class.txt
@@ -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.