A number of modules in the input subsystem use EXPORT_SYMBOL() and
friends without explicitly including the corresponding header
<linux/export.h>. While the build currently succeeds due to this header
being pulled in transitively, this is not guaranteed to be the case in
the future.
Let's add the explicit include to make the dependencies clear and
prevent future build breakage.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Some touch devices provide mechanical overlays with different objects
like buttons or clipped touchscreen surfaces.
In order to support these objects, add a series of helper functions
to the input subsystem to transform them into overlay objects via
device tree nodes.
These overlay objects consume the raw touch events and report the
expected input events depending on the object properties.
Note that the current implementation allows for multiple definitions
of touchscreen areas (regions that report touch events), but only the
first one will be used for the touchscreen device that the consumers
typically provide.
Should the need for multiple touchscreen areas arise, additional
touchscreen devices would be required at the consumer side.
There is no limitation in the number of touch areas defined as buttons.
Reviewed-by: Jeff LaBundy <jeff@labundy.com>
Signed-off-by: Javier Carrasco <javier.carrasco@wolfvision.net>
Link: https://lore.kernel.org/r/20241016-feature-ts_virtobj_patch-v11-2-b292a1bbb0a1@wolfvision.net
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
