Hi Pavel, On 4/27/23 13:04, Pavel Machek wrote: > Hi! > >> Some touchscreens are shipped with a physical layer on top of them where >> a number of buttons and a resized touchscreen surface might be >> available. > > Yes, it is quite comon, for example Motorola Droid 4 has 4 virtual > buttons below touchscreen. Are those buttons configurable in some way? Or do they have a fixed purpose? How does Android handle those buttons, BTW? > One question is if this should be handled inside the kernel. It will > make it compatible with existing software, but it will also reduce > flexibility. I would say that it should be described in device tree if the purpose is fixed. For example, if there is no display behind the touch screen at a certain point but a printed sheet (e.g., with a home or return symbol) then it is clear that this button is not going to change. In such a case I doubt that flexibility is required. Best regards, Michael > > Best regards, > Pavel
