Hi, [...] > > Hm. Why not touching pixel (0,0) on the touch is always pixel (0,0) > > on the screen and touching pixel (639,479) is always (639,479)? > > Important is that there is no 1:1 mapping between input evdev device > and drm/fb output device. These are two independent devices. There is > no connection between screen and touch. So such presumption should > not be done in kernel. You can do that in userspace. > But at least it can be told to userspace that these two devices are connected. That information should be specified in devicetree because it is not auto-detectable. > Lets take e.g. touchpad. It acts similarly as touchscreen input device > (both reports absolute positioned touch events), but touchpad is not > connected with screen. And from kernel point of view these devices are > both input and absolute positioned. > > It looks like the whole problem is there that you wanted to do this > mapping for your hardware in kernel. And this is not what is kernel > doing or should do. Moreover I know people who are using integrated > touchscreen on laptop as (touch) input device for external monitor. > And in this configuration it does not make any sense to map > touchscreen input to pixels of integrated LCD touchscreen (as > external monitor could have different resolution as integrated LCD > touchcreen). > Interesting example. But then you also do not need flipping/rotation because the angle between your screen and your absolute position device is not fixed. Regards, Andreas >
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