Navdeep Parhar 8d92e1db93 Add a driver ioctl to read a byte from any device on a port's i2c bus.
This lets userspace read arbitrary information from the SFP+ modules
etc. on this bus.

Reading multiple bytes in the same transaction isn't possible right now.
I'll update the driver once the chip's firmware supports this.

MFC after:	3 days
2012-10-10 17:13:46 +00:00
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