In order to better diagnose potential issues let's return error to the
upper layers when resuming the device fails and also add a few diagnostic
messages.
Signed-off-by: NDuson Lin <dusonlin@emc.com.tw>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

To allow for different firmware sizes let's replace the original size check
with with checking the signature in the firmware data.
Signed-off-by: NDuson Lin <dusonlin@emc.com.tw>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

This driver supports Elan I2C/SMbus touchpads found in some laptops and
also in many Chromebooks.
Signed-off-by: NDuson Lin <dusonlin@emc.com.tw>
Reviewed-by: NBenson Leung <bleung@chromium.org>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>