This object needs special handling when it is opened, to set up the CLI
and the vidconsole context. Add special support for this.
Signed-off-by: Simon Glass <sjg@chromium.org>
A textline is a line of text which can be edited by the user. It has a
maximum length (in chracters) but otherwise there are no restrictions.
Signed-off-by: Simon Glass <sjg@chromium.org>