tree 9d3cdeed22268d9484bbeed06a2ee84db10e16d8
parent b6c79f2ca1032e2da7ad8523b83f0cf5cc04dbc0
author Benjamin Tissoires <benjamin.tissoires@redhat.com> 1406232065 -0700
committer Dmitry Torokhov <dmitry.torokhov@gmail.com> 1406339633 -0700

Input: wacom - remove usb dependency for siblings devices

Wacom tablets can share different physical sensors on one physical device.
These are called siblings in the code. The current way of implementation
relies on the USB topology to be able to share data amongs those sensors.

We can replace the code to match a HID subsystem, without involving the USB
topology:
- the first probed sensor does not find any siblings in the list
  wacom_udev_list, so it creates its own wacom_hdev_data with its own
  struct hid_device
- the other sensor checks the current list of siblings in wacom_hdev_data,
  and if there is a match, it associates itself to the matched device.

To be sure that we are not associating different sensors from different
physical devices, we also check for the phys path of the hid device which
contains the USB topology.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: Jason Gerecke <killertofu@gmail.com>
Tested-by: Jason Gerecke <killertofu@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>