Jean Delvare e4879e28ab hwmon: (ds1621) Avoid unneeded register access ...

Register access over SMBus isn't cheap, so avoid register access where
possible:
* Only write back the configuration register if it changed.
* Don't refresh the register cache when we don't have to.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Aurelien Jarno <aurelien@aurel32.net>

2009-03-30 21:46:40 +02:00

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