Quoting Philip Chen (2021-01-14 18:30:31) > The top-row keys in a keyboard usually have dual functionalities. > E.g. A function key "F1" is also an action key "Browser back". > > Therefore, when an application receives an action key code from > a top-row key press, the application needs to know how to correlate > the action key code with the function key code and do the conversion > whenever necessary. > > Since the userpace already knows the key scanlines (row/column) > associated with a received key code. Essentially, the userspace only > needs a mapping between the key row/column and the matching physical > location in the top row. > > So, enhance the cros-ec-keyb driver to create such a mapping > and expose it to userspace in the form of a function_row_physmap > attribute. The attribute would be a space separated ordered list of > row/column codes, for the keys in the function row, in a left-to-right > order. > > The attribute will only be present when the device has a custom design > for the top-row keys. > > Signed-off-by: Philip Chen <philipchen@xxxxxxxxxxxx> > --- Reviewed-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
