I'm trying to adjust sensitivity of my friend's wall touch light switch.

And I'm dumbfounded.

There is HD6001 touch IC
http://www.hab.com.tw/upload/2013879261133084.pdf.
There is our usual Atmel EEPROM.
http://ww1.microchip.com/downloads/en/devicedoc/doc0180.pdf.
Also, there is something which has to be a RF receiver, which doesn't interest me.
I thought the EEPROM would keep settings for the device. I dumped it's content (whatever is the meaning of it).
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF
22 0D F9 93 FF FF FF FF FF FF FF FF FF FF FF FF
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
FF FF FF FF FF FF FF FF FF FF FF FF 40 FF FF FF
14 FC A9 E2 14 AF 43 90 FF FF FF FF FF FF FF FF
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
FF FF FF FF FF FF FF FF FF FF FF FF 84 FF FF FF
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
But when I read the touch IC datasheet (a Chinese flavor of a datasheet style, but not too bad), it seems that it can communicate over I2C only as a slave. And there is the eeprom. So we have two gearboxes and no engine. And indeed, there is no communication over I2C bus when the switch is powered up or buttons are pressed (I don't have a compatible remote to check if anything changes when I'd program one).
The touch IC supposedly has some registers to control its settings, but I cannot find the IC on the I2C bus to communicate with it. It doesn't help that the I2C address is kept in one of the registers. But anyway, a scanner doesn't find it.
Could anyone help me make heads or tails of it? Why the eeprom? How to talk to the touch IC?