power: supply: bq25890_charger: Read back the current battery voltage

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

Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Angus Ainslie (Purism) <angus@akkea.ca>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

diff --git a/drivers/power/supply/bq25890_charger.c b/drivers/power/supply/bq25890_charger.c
index 23b39da..1aa7872 100644 (file)
--- 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[] = {