Public bug reported:

[Impact]
The touchpad right button should send 273(BTN_RIGHT),
and the left button should send 272(BTN_LEFT)
But the touchpad right button sends 274(BTN_MIDDLE),
and the left button sends 273 (BTN_RIGHT)

[Fix]
The fix is pretty simple to just decrease the event code by 1.

[Test Case]
Verified on the machine has this issue, and confirm this patch works.

[Regression Potential]
The patch has strict if statement, so it won't affect other touchpad devices.
And no more rework on this code snip after this commit.

** Affects: hwe-next
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: AceLan Kao (acelankao)
         Status: In Progress


** Tags: originate-from-1707102 somerville

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https://bugs.launchpad.net/bugs/1708372

Title:
  The Precision Touchpad(PTP) button sends incorrect event code

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