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regulator: s5m8767: Use DIV_ROUND_UP to calculate selector

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Integer division may truncate the result.
Use DIV_ROUND_UP to ensure new voltage setting falls within specified range.

Also properly handle the case min_vol < desc->min to ensure we don't return
negative value for selector.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Axel Lin 2012-04-13 09:30:05 +08:00 committed by Mark Brown
parent b9b49af5ef
commit 94e85a3c5d
1 changed files with 4 additions and 1 deletions
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5
drivers/regulator/s5m8767.c
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@ -347,7 +347,10 @@ static int s5m8767_convert_voltage_to_sel(
if (max_vol < desc->min || min_vol > desc->max)
return -EINVAL;
selector = (min_vol - desc->min) / desc->step;
if (min_vol < desc->min)
min_vol = desc->min;
selector = DIV_ROUND_UP(min_vol - desc->min, desc->step);
if (desc->min + desc->step * selector > max_vol)
return -EINVAL;