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A number of different ALPS touchpad protocols can reuse alps_process_touchpad_packet_v3() with small tweaks to the bitfield decoding. Create a new priv->decode_fields() callback that handles the per-model differences. Signed-off-by: Kevin Cernekee <cernekee@gmail.com> Tested-by: Dave Turvene <dturvene@dahetral.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>