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power: supply: lego_ev3_battery: Don't ignore iio_read_channel_processed() return value 

This changes the LEGO MINDSTORMS EV3 power supply driver to return an
error if iio_read_channel_processed() fails.

Signed-off-by: David Lechner <david@lechnology.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
This commit is contained in:
David Lechner 2018-07-20 15:19:43 -05:00 committed by Sebastian Reichel
parent 0d94990527
commit 6e92cecb1e
1 changed files with 14 additions and 4 deletions
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18
drivers/power/supply/lego_ev3_battery.c
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@ -39,7 +39,7 @@ static int lego_ev3_battery_get_property(struct power_supply *psy,
union power_supply_propval *val)
{
struct lego_ev3_battery *batt = power_supply_get_drvdata(psy);
int val2;
int ret, val2;
switch (psp) {
case POWER_SUPPLY_PROP_TECHNOLOGY:
@ -47,11 +47,18 @@ static int lego_ev3_battery_get_property(struct power_supply *psy,
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
/* battery voltage is iio channel * 2 + Vce of transistor */
iio_read_channel_processed(batt->iio_v, &val->intval);
ret = iio_read_channel_processed(batt->iio_v, &val->intval);
if (ret)
return ret;
val->intval *= 2000;
val->intval += 200000;
/* plus adjust for shunt resistor drop */
iio_read_channel_processed(batt->iio_i, &val2);
ret = iio_read_channel_processed(batt->iio_i, &val2);
if (ret)
return ret;
val2 *= 1000;
val2 /= 15;
val->intval += val2;
@ -64,7 +71,10 @@ static int lego_ev3_battery_get_property(struct power_supply *psy,
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
/* battery current is iio channel / 15 / 0.05 ohms */
iio_read_channel_processed(batt->iio_i, &val->intval);
ret = iio_read_channel_processed(batt->iio_i, &val->intval);
if (ret)
return ret;
val->intval *= 20000;
val->intval /= 15;
break;