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Yep, that's basically their functions. The kernel code gives additional hints AFAICS. You probably can't dump their firmware easily, though. I think they were I2C or SPI coupled to the SoC's bus - and probably, plugging onto an existing I2C bus is the easiest way to add your own sensors? It's probably not really worth the hassle to do it indirectly via one of the MSP430s.
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