在2022年11月9日十一月 下午8:59，Hans de Goede写道： > Hi All, > > I'm emailing you all because you have written patches or > reported bugs related to the ideapad-laptop touchpad > handling the past. Hi all, Sorry for chime in this old thread, but I'm able to get some input from a Lenovo engineer. Quoting him: "For newer Lenovo laptops we use TPRD/TPWR methods under touchpad's ACPI I2C HID device to sync touchpad state with EC. TPRD will return current touchpad state known by EC and OS can use TPWR to switch EC's touchpad state. This state will be used by EC to control LEDs and touchpad power saving signals." According to my understanding we only need replace read write to VPCCMD_R_TOUCHPAD with calling TPRD/TPWR methods to get all new ideapads work. As per my reverse engineering on ASLs this method actually reads a flag from EC's LPC memory space and it do work on some early ideapads (The earliest one I can trace is Ideapad 320-15ISK which is released on 2018). I'm going to try to implement it in kernel. Though I haven't decide which part of driver should handle this, as those methods are under ACPI I2C HID device perhaps we should put this function under i2c-hid-acpi driver. However as the method is very ideated specific, putting in ideapad-acpi seems more reasonable... Any thoughts? He also told me how to get VPC2004 device's BIOS interface version, though the differences between versions remains unclear to me. I think we can expose it in dmesg and debugfs to help with future debugging and hopefully reduce the amount of DMI quirks. Thanks. -- - Jiaxun
