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tsc2046 touchscreen calibration with Omapl138 platform

Shivdas Gujare
Prodigy 130 points
Other Parts Discussed in Thread: OMAPL138, TSC2046, ADS7846

Hi, I am trying to make tsc2046 controller based touchscreen working with omapl138 based platform.

I am able to get basic initialisation of SPI and touchscreen working with kernel 2.6.32 I am facing only one problem regarding the calibration,
currently TI's tsc2046 touchscreen controller(driver is at drivers/input/touchscreen/ads7846.c) is reporting data only from from 1 to 15, hence I can touch only for a square of "53*35" (800/15 * 480/15) for a wvga screen (800*480).

in simple words, touchscreen senses only in corners of 53*35 squares and touchscreen scans in X and Y for only 15 steps.
Does anyone have seen this behaviour, please point me if I need to look at any hardware configuration or driver modification.

Thanks for your help.

Thanks and Regards,
Shivdas