Input: add BTN_TOOL_QUINTTAP for reporting 5 fingers on touchpad

"4-finger scroll" is a gesture supported by some applications and
operating systems.

"Resting thumb" is when a clickpad user rests a finger (e.g., a
thumb), in a "click zone" (typically the bottom of the touchpad) in
anticipation of click+move=select gestures.

Thus, "4-finger scroll + resting thumb" is a 5-finger gesture.
To allow userspace to detect this gesture, we send BTN_TOOL_QUINTTAP.

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Acked-by: Chase Douglas <chase.douglas@canonical.com>
Acked-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/input.h b/include/linux/input.h
index 068784e17972..4de4b4661f84 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -503,6 +503,7 @@ struct input_keymap_entry {
 #define BTN_TOOL_FINGER         0x145
 #define BTN_TOOL_MOUSE          0x146
 #define BTN_TOOL_LENS           0x147
+#define BTN_TOOL_QUINTTAP       0x148   /* Five fingers on trackpad */
 #define BTN_TOUCH               0x14a
 #define BTN_STYLUS              0x14b
 #define BTN_STYLUS2             0x14c