[PATCH] I2C: Store lm83 and lm90 temperatures in signed

[PATCH] I2C: Store lm83 and lm90 temperatures in signed

Back when I wrote the lm83 and lm90 drivers, I decided to use unsigned
variables to store temperature values as mirrored from the chipset
registers. I wonder why, since the registers use signed values
themselves. The patch below changes the variables back to signed types,
so as to simplify the conversions made by the driver, making them faster
and easier to understand.

Additionally, the lm90 driver was lacking boundary checkings and proper
rounding when writing temperature limits to the chipset, so I added
these. I also reworded the comments about internal temperature values
representation for all chipsets.

Tested to work fine on my (LM90-compatible) ADM1032 chip. lm83 patch
untested, but it is more simple and directly copied from the lm90, so I
am confident it works fine too.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>