Hi Martin, I am aware of tslib. However, I was not able to find something like that on Android Systems. Thanks, Sriram On Fri, May 19, 2017 at 6:24 PM, Martin Kepplinger <martin.kepplinger@xxxxxxxxxxxxx> wrote: > On 2017-05-18 11:21, Sriram V wrote: >> Hi, >> >> I wanted to find out how does touch calibration works? Is this >> something that is taken care in the userspace? >> Unfortunately, my device does not have a Write Interface. I have read >> the values from the device but can't do i2c writes to the device. >> I also wanted to find out how touch screen calibration is done in >> Android systems. >> > > Calibration is linear transformation of coordinate values. Usually this > is not a driver's work. The driver should make sure userspace can talk > in "evdev" sync frames. > > It is usually done in userspace, by an X.org input "driver" for example. > At least I think xf86-input-evdev does some calibration. > > For touchscreen devices, especially in embedded and if people need more > filters than linear transormation, tslib ( http://tslib.org ) is often > used for calibration. The one tslib module doing calibration is called > "linear" and can be configured (the actual calibration process) with a > graphical framebuffer application, ts_calibrate which is part of tslib. > > martin > > ________________________________ > > Ginzinger electronic systems GmbH > Gewerbegebiet Pirath 16 > 4952 Weng im Innkreis > www.ginzinger.com > > Firmenbuchnummer: FN 364958d > Firmenbuchgericht: Ried im Innkreis > UID-Nr.: ATU66521089 > -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
