power: max17042: do not lose accuracy calculating current_now

PROP_CURRENT_NOW value is first divided then multiplied up causing a lose of accuracy. Use the same method as PROP_CURRENT_AVG to do the calculation.

Signed-off-by Philip Rakity

---
drivers/power/max17042_battery.c | 3 +--

1 files changed, 1 insertions(+), 2 deletions(-)

drivers/power/max17042_battery.c +1 -2

index 4245806..7b7762a 100644
@@ -153,8 +153,7 @@ static int max17042_get_property(struct power_supply *psy,
 val->intval++;
 val->intval *= -1;
 }
- val->intval >>= 4;
- val->intval *= 1000000 * 25 / chip->pdata->r_sns;
+ val->intval *= 1562500 / chip->pdata->r_sns;
 } else {
 return -EINVAL;
 }

Signature · 1 line

1.7.0.4

Philip Rakity<[email protected]> Date : 2011-08-13 13:19 (GMT+09:00)

Quoted 6 lines

PROP_CURRENT_NOW value is first divided then multiplied up causing a lose of accuracy. Use the same method as PROP_CURRENT_AVG to do the calculation.

Signed-off-by Philip Rakity

Acked-by MyungJoo Ham <[email protected]>