Andan,
Can you please test latest mainline kernel? I think this commit can fix your 
issue:
commit 670784fb4ebe54434e263837390e358405031d9e
Author: Kai-Heng Feng <kai.heng.f...@canonical.com>
Date:   Tue Apr 30 16:37:53 2019 +0800

    pinctrl: intel: Clear interrupt status in mask/unmask callback
    
    Commit a939bb57cd47 ("pinctrl: intel: implement gpio_irq_enable") was
    added because clearing interrupt status bit is required to avoid
    unexpected behavior.
    
    Turns out the unmask callback also needs the fix, which can solve weird
    IRQ triggering issues on I2C touchpad ELAN1200.
    
    Signed-off-by: Kai-Heng Feng <kai.heng.f...@canonical.com>
    Signed-off-by: Andy Shevchenko <andriy.shevche...@linux.intel.com>

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Title:
  Touchpad not detecting in Linux

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