On Wed, Jan 26, 2022 at 05:18:32PM +0100, Benjamin Tissoires wrote: > The HID core stack used to be very relaxed considering the BTN_TOOL_* > usage. With the recent commits, we should now enforce to have only one > tool at a time, meaning that we can now express that requirement in the > docs. > > Signed-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx> > --- > Documentation/input/event-codes.rst | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/Documentation/input/event-codes.rst b/Documentation/input/event-codes.rst > index b24ae7d292cc..41b1fa647dab 100644 > --- a/Documentation/input/event-codes.rst > +++ b/Documentation/input/event-codes.rst > @@ -137,7 +137,10 @@ A few EV_KEY codes have special meanings: > code should be set to a value of 1. When the tool is no longer interacting > with the input device, the BTN_TOOL_<name> code should be reset to 0. All > trackpads, tablets, and touchscreens should use at least one BTN_TOOL_<name> > - code when events are generated. > + code when events are generated. Likewise all trackpads, tablets, and > + touchscreens should export only one BTN_TOOL_<name> at a time. It is s/export/set to nonzero/ to avoid any ambiguity with setting the evbit on the device vs setting the value to nonzero. > + however accepted to switch tool in one EV_SYN frame by setting the old > + BTN_TOOL_<name> at a value of 0 and the new one at 1. I would even s/accepted/recommended/ but this LGTM to me, thanks. Acked-by: Peter Hutterer <peter.hutterer@xxxxxxxxx> Cheers, Peter
