Have you tried doing a hard SMC reset? Disconnect the battery and the MagSafe cable, now press and hold the power button for a good 15secs to fully discharge the logic board, now plug in the MagSafe charger the system should spontaneously restart, let it fully boot up and do a proper shutdown. Now plug the battery back in and restart once more is the keyboard and trackpad working now? If not go to About This Mac and open the System Report, locate the USB section do you see the internal keyboard & trackpad listed?
Let us know what you find