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  1. Jul 31, 2019
  2. Jul 29, 2019
    • Jason Gerecke's avatar
      udev: Reproduce entire LIBINPUT_DEVICE_GROUP for paired ExpressKey Remote · 5521ab03
      Jason Gerecke authored and Peter Hutterer's avatar Peter Hutterer committed
      
      In order for two devices to be in the same group, they need to share
      identical LIBINPUT_DEVICE_GROUP attributes. The `wacom_handle_ekr` function
      overwrites the VID/PID for an ExpressKey Remote, but the 'phys' path is
      left unchanged. This only works if the EKR and the device we want to pair
      it with are both direct sibings in the USB tree. It isn't always possible
      to actually connect the devices like this, however. The Cintiq Pro 32 and
      24, for instance, have multiple internal USB hubs and place the pen sensor
      and the USB port for the EKR dongle behind different ones.
      
      By copying the 'phys' path of the device we want to pair with, it is
      possible to reproduce the entire LIBINPUT_DEVICE_GROUP and ensure that
      the two devices actually end up paired in libinput.
      
      Signed-off-by: default avatarJason Gerecke <jason.gerecke@wacom.com>
      5521ab03
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