Input: elan_i2c - check if device is there before really probing
Before trying to properly initialize the touchpad and generate bunch of errors, let's first see it there is anything at the given address. If we get error, fail silently with -ENXIO. Reviewed-by: NGuenter Roeck <linux@roeck-us.net> Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>
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