Input: elants_i2c - provide an attribute to show calibration count
There is an non-touch case by non-calibration after update firmware. Elan could know calibrate or not by calibration count. The value of '0xffff' means we didn't calibrate after update firmware. If calibrate success, it will plus one and change to '0x0000'. Signed-off-by: NJohnny Chuang <johnny.chuang@emc.com.tw> Link: https://lore.kernel.org/r/1588754932-5902-1-git-send-email-johnny.chuang.emc@gmail.comSigned-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>
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