power: introducing pwr_avg console command

pwr_avg provides an average voltage, current, and power over the last
1 minute. It's up to the battery drivers to implement this
functionality.
This change allows us to have better power tracking while minimizing
the power impact on the EC, because
- the pwr_avg command only needs to be called once every minute, and is
short, thus less expensive to parse on ECs without a UART buffer
- the work done to keep the avg is partially done by the batteries
already and it's just a question of retrieving it.

undefined on wheatley since no power debugging planned on that board.

usage:
> pwr_avg
mv = 7153
ma = -605
mw = -4327

BUG=chromium:752320
BRANCH=None
TEST=make buildall -j

Change-Id: Id1a3479d277aedf90dfa965afb4ee9136654b1cf
Signed-off-by: Ruben Rodriguez Buchillon <coconutruben@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/823884
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/include/battery.h b/include/battery.h
index 0ccd29319d..43425fcd8c 100644
--- a/include/battery.h
+++ b/include/battery.h
@@ -74,6 +74,16 @@ struct batt_params {
 	int flags;            /* Flags */
 };
 
+/*
+ * Provide a 1 minute average of the current and voltage on the battery.
+ * Does not check for flags or whether those values are bad readings.
+ * See driver/battery/[your_driver].h/c for details on implementation and
+ * how the average is calculated.
+ */
+
+int battery_get_avg_current(void); /* in mA */
+int battery_get_avg_voltage(void); /* in mV */
+
 /* Flags for batt_params */
 
 /* Battery wants to be charged */