Add a input_kbd_matrix doxygen group and add this to the other Input
APIs page, add few missing argument documentation entries.
Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>
Looking back at the current INPUT_LISTENER_CB_DEFINE api naming, it
feels like it's a bit overloaded. Rename it to a simpler
INPUT_CALLBACK_DEFINE.
Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>
Add few details about the kscan compatibility driver, mention the
relevant Kconfig options and an example (which is also present in the
binding file).
Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>
