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PMIC

The gamepad's power management IC is a Texas Instruments SN1010007. So far no datasheet has been found.

It is connected to the UIC's I2C bus, where its device ID is 0x48.

I2C communications

Communications to the PMIC always start by writing one byte, which is likely a register ID/address. Then further bytes are written or read in order to access the registers themselves.

The UIC firmware has code for accessing the following registers:

Register	Description
0x01	??
0x02	??
0x03	??
0x04	??
0x06	??
0x07	??
0x08	?? – seemingly accessed after 0x07
0x09	??
0x0D	??
0x0F	??
0x18	Backlight related – 0x90=on 0x10=off
0x19	Backlight related – maybe timeout/delay?