On Thursday, February 20, 2014 2:19:54 AM UTC+5:30, petr....@gmail.com wrote: > > Hi there, > > I need to calibrate screen (move coordinates to right, basically add some > margin to left). Where is the best place to adjust the code? In kernel > driver? > Or would it be possible and easier in user space libraries? Or is there a > some > boot parameter? (something like disp.screen0_output_mode from > http://linux-sunxi.org/Kernel_arguments)? > > I'm using Allwinner A31. > > Thanks for any advice. >
Refer to the AOSP documentation: http://s.android.com/devices/tech/input/touch-devices.html#touch-device-driver-requirements As per point 5, you need to supply the min and max values for the x and y axes corresponding to the edges of the actual display area. Android framework then takes care of calibration. As an example, in the rowboat kernel for AM335x, the x-min, x-max, y-min, y-max corresponding to the display corners are set up as platform data to be supplied to the Touch driver, which in turn sends it to the Android framework using the input subsystem of the kernel. https://gitorious.org/rowboat/kernel/source/03f2a1e9ea7f8b11ff6809f5a75b614011f8adb6:arch/arm/mach-omap2/board-am335xevm.c#L270 https://gitorious.org/rowboat/kernel/source/03f2a1e9ea7f8b11ff6809f5a75b614011f8adb6:drivers/input/touchscreen/ti_tsc.c#L392 To obtain the min/max values you can use the getevent utility in android http://s.android.com/devices/tech/input/getevent.html -Vishveshwar > Regards, > Petr > -- -- unsubscribe: android-porting+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-porting --- You received this message because you are subscribed to the Google Groups "android-porting" group. To unsubscribe from this group and stop receiving emails from it, send an email to android-porting+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
