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| author | Axel Lin <axel.lin@gmail.com> | 2012-04-13 09:30:05 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-04-23 13:18:10 +0100 |
| commit | 94e85a3c5d702a4ce96b7a9b883c949a08ebd93c (patch) | |
| tree | 96d4d9bcc1e06d67ba5eef89eb6f6ce976d6a274 | |
| parent | b9b49af5efa405f3c394a6395e79092c785999a3 (diff) | |
| download | blackbird-op-linux-94e85a3c5d702a4ce96b7a9b883c949a08ebd93c.tar.gz blackbird-op-linux-94e85a3c5d702a4ce96b7a9b883c949a08ebd93c.zip | |
regulator: s5m8767: Use DIV_ROUND_UP to calculate selector
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>
| -rw-r--r-- | drivers/regulator/s5m8767.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/regulator/s5m8767.c b/drivers/regulator/s5m8767.c index cb53187a60d3..ebe72d071b44 100644 --- a/drivers/regulator/s5m8767.c +++ b/drivers/regulator/s5m8767.c @@ -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; |
