0x00 - Microsoft: Type/Touch Cover
Technical information about Type/Touch Covers for Surface RT/2
- HID over I2C
- Address: 0x00
- Bus speed: 400kHz
- HID_Descriptor: 0x0041
- ACPI Device: SNMU
- Bridge IC: PMIC.REG1: 1.8V
- tCover Power: PMIC.REG3: 2.8V
HID Interrupt: O5 Hotplug Interrupt: S0
The tCover I2C address is 0x00. This address is reserved for
general call. Linux doesn't allow I2C Slaves to use this address therefore the I2C driver must be patched to allow 0x00 as valid Slave address.
i2c-hotplug-gpiois a grate driver and doesn't work in mainline.