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From: Carl Philipp Klemm <philipp@uvos.xyz>
To: Sebastian Reichel <sre@kernel.org>
Cc: linux-pm@vger.kernel.org, linux-omap@vger.kernel.org,
	Arthur Demchenkov <spinal.by@gmail.com>,
	Tony Lindgren <tony@atomide.com>,
	Merlijn Wajer <merlijn@wizzup.org>, Pavel Machek <pavel@ucw.cz>
Subject: [PATCH 3/5] power: supply: cpcap-battery: invalidate empty->counter_uah and charge_full when they are grossly wrong
Date: Sun, 17 Jan 2021 22:46:38 +0100
Message-ID: <20210117224638.10c9d9aee7c0144fafd70520@uvos.xyz> (raw)

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>
---
 drivers/power/supply/cpcap-battery.c | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/drivers/power/supply/cpcap-battery.c b/drivers/power/supply/cpcap-battery.c
index 86ed41d9627f..8ae0c9c7ebcb 100644
--- a/drivers/power/supply/cpcap-battery.c
+++ b/drivers/power/supply/cpcap-battery.c
@@ -667,10 +667,22 @@ 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) {
+			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) {
+			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 +759,7 @@ 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;
-- 
2.29.2



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Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-17 21:46 Carl Philipp Klemm [this message]
2021-04-05  8:12 ` Sebastian Reichel

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