Documentation/input/event-codes.rst

116     Client should ignore all events up to and including next SYN_REPORT
137     code should be set to a value of 1. When the tool is no longer interacting
138     with the input device, the BTN_TOOL_<name> code should be reset to 0. All
139     trackpads, tablets, and touchscreens should use at least one BTN_TOOL_<name>
168     BTN_TOOL_DOUBLETAP should be set to value 1 for the duration of the motion.
170     purpose. A trackpad event generated by finger touches should generate events
172     codes should have a value of 1 during any synchronization frame.
177 Note: In multitouch drivers, the input_mt_report_finger_count() function should
185 space is unknown. If the absolute position is known, EV_ABS codes should be used
197     REL_WHEEL_HI_RES and REL_HWHEEL_HI_RES should be preferred where
225     event should only be emitted while the tool is hovering, meaning in close
229   - BTN_TOOL_<name> should be set to 1 when the tool comes into detectable
264     should be coded as an uint32 value, which is allowed to wrap around with
311 The INPUT_PROP_DIRECT property indicates that device coordinates should be
324 considered undefined and the device type should be deduced in the
331 pressing down on the pad causes a button click, this property should be
344 touchpads, the semi-mt property should be set.
363 If INPUT_PROP_TOPBUTTONPAD is set, userspace should emulate buttons
389 the primary button press. BTN_{MIDDLE,RIGHT,4,5,etc.} should be used to report
390 further buttons of the device. REL_WHEEL and REL_HWHEEL should be used to report
399 contact. BTN_TOOL_<name> events should be reported where possible.
401 For new hardware, INPUT_PROP_DIRECT should be set.
410 location of the touch. BTN_TOUCH should be used to report when a touch is active
411 on the trackpad. Where multi-finger support is available, BTN_TOOL_<name> should
414 For new hardware, INPUT_PROP_POINTER should be set.
421 should be used to report when the tool is in contact with the tablet.
422 BTN_{STYLUS,STYLUS2} should be used to report buttons on the tool itself. Any
428 For new hardware, both INPUT_PROP_DIRECT and INPUT_PROP_POINTER should be set.