No Touchpad connection
There does not appear to be any touchpad connection in the schematic. Laptop touchpads are expected to be PS2 type devices, and so we need to either translate PS2 to SPI or I2C, or bridge to USB. The Sprintek matrix keyboard encoder chip can do that to USB (sk5126), and a different model Sprinted chip can do it using HID over I2C (sk5210). Both parts have an external PS2 connection of 2 pins, which are currently not connected to anything. The Sprintek chip that connects to host by either USB or PS2 (sk5126) cannot pass through the external PS2 connection if that is a mouse, but can do it if a keyboard. But touchpad will need connected somewhere for usage.