linux-kernel - [PATCH v4 4/4] power: bq25890_charger.c: Read back the current battery voltage

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Message-Id: <20180731174909.9392-5-angus@akkea.ca>
Date:   Tue, 31 Jul 2018 11:49:09 -0600
From:   "Angus Ainslie (Purism)" <angus@...ea.ca>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     angus.ainslie@...i.sm, Sebastian Reichel <sre@...nel.org>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Angus Ainslie (Purism)" <angus@...ea.ca>
Subject: [PATCH v4 4/4] power: bq25890_charger.c: Read back the current battery voltage

The BQ2589x family has the capability of reading the current battery voltage.

Reviewed-by: Krzysztof Kozlowski <krzk@...nel.org>
Signed-off-by: Angus Ainslie (Purism) <angus@...ea.ca>
---
 drivers/power/supply/bq25890_charger.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/power/supply/bq25890_charger.c b/drivers/power/supply/bq25890_charger.c
index 23b39da07e56..1aa7872ddeb0 100644
--- a/drivers/power/supply/bq25890_charger.c
+++ b/drivers/power/supply/bq25890_charger.c
@@ -461,6 +461,15 @@ static int bq25890_power_supply_get_property(struct power_supply *psy,
 		val->intval = bq25890_find_val(bq->init_data.iterm, TBL_ITERM);
 		break;
 
+	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+		ret = bq25890_field_read(bq, F_SYSV); /* read measured value */
+		if (ret < 0)
+			return ret;
+
+		/* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */
+		val->intval = 2304000 + ret * 20000;
+		break;
+
 	default:
 		return -EINVAL;
 	}
@@ -669,6 +678,7 @@ static enum power_supply_property bq25890_power_supply_props[] = {
 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
 	POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
+	POWER_SUPPLY_PROP_VOLTAGE_NOW,
 };
 
 static char *bq25890_charger_supplied_to[] = {
-- 
2.17.1