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

From: Angus Ainslie (Purism)
Date: Tue Jul 31 2018 - 13:49:45 EST


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

Reviewed-by: Krzysztof Kozlowski <krzk@xxxxxxxxxx>
Signed-off-by: Angus Ainslie (Purism) <angus@xxxxxxxx>
---
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