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Add PEC support to the lm90 driver. Only the ADM1032 chip supports it, and in a rather tricky way, which is why this patch comes with documentation reinforcements. At least, this demonstrates that the new PEC support logic in i2c-core can properly deal with chips with partial PEC support. As enabling PEC causes a significant performance drop, it can be disabled through a procfs file (unsurprisingly named "pec"). git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@3181 7894878c-1315-0410-8ee3-d5d059ff63e0