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I think that's a matter of firmware. Old kernel 2.6 didn't expose the g_sensor as an input device. Probably newer firmwares switched to a newer kernel where that driver is enabled. Not sure about the firmwares but I bet you're on kernel 3.0.2x.
light controller should be exposed too as a sysfs node (on /sys/class/backlight or /sys/class/platform).
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