From aecd127b45eac8ce0ff667a4a855ff66905fb88c Mon Sep 17 00:00:00 2001
From: Carl Philipp Klemm <philipp@uvos.xyz>
Date: Fri, 23 Apr 2021 14:58:31 +0200
Subject: power: supply: cpcap-battery: invalidate config when incompatible
measurements are read
This invalidates empty->counter_uah and charge_full when charge_now
indicates that they are grossly wrong and adds some tolerance to
POWER_SUPPLY_PROP_CHARGE_FULL to allow for inaccuracies in the charge
counter and manufacturing tolerances in the battery.
Signed-off-by: Carl Philipp Klemm <philipp@uvos.xyz>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
drivers/power/supply/cpcap-battery.c | 19 ++++++++++++++++---
1 file changed, 16 insertions(+), 3 deletions(-)
(limited to 'drivers')
diff --git a/drivers/power/supply/cpcap-battery.c b/drivers/power/supply/cpcap-battery.c
index a3fc0084cda0..8d62d4241da3 100644
--- a/drivers/power/supply/cpcap-battery.c
+++ b/drivers/power/supply/cpcap-battery.c
@@ -667,10 +667,23 @@ static int cpcap_battery_get_property(struct power_supply *psy,
if (!empty->voltage)
return -ENODATA;
val->intval = empty->counter_uah - latest->counter_uah;
- if (val->intval < 0)
+ if (val->intval < 0) {
+ /* Assume invalid config if CHARGE_NOW is -20% */
+ if (ddata->charge_full && abs(val->intval) > ddata->charge_full/5) {
+ empty->voltage = 0;
+ ddata->charge_full = 0;
+ return -ENODATA;
+ }
val->intval = 0;
- else if (ddata->charge_full && ddata->charge_full < val->intval)
+ } else if (ddata->charge_full && ddata->charge_full < val->intval) {
+ /* Assume invalid config if CHARGE_NOW exceeds CHARGE_FULL by 20% */
+ if (val->intval > (6*ddata->charge_full)/5) {
+ empty->voltage = 0;
+ ddata->charge_full = 0;
+ return -ENODATA;
+ }
val->intval = ddata->charge_full;
+ }
break;
case POWER_SUPPLY_PROP_CHARGE_FULL:
if (!ddata->charge_full)
@@ -747,7 +760,7 @@ static int cpcap_battery_set_property(struct power_supply *psy,
case POWER_SUPPLY_PROP_CHARGE_FULL:
if (val->intval < 0)
return -EINVAL;
- if (val->intval > ddata->config.info.charge_full_design)
+ if (val->intval > (6*ddata->config.info.charge_full_design)/5)
return -EINVAL;
ddata->charge_full = val->intval;
--
cgit