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Diffstat (limited to 'Documentation/input/event-codes.rst')
| -rw-r--r-- | Documentation/input/event-codes.rst | 25 |
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diff --git a/Documentation/input/event-codes.rst b/Documentation/input/event-codes.rst index b4557462edd7..4424cbff251f 100644 --- a/Documentation/input/event-codes.rst +++ b/Documentation/input/event-codes.rst @@ -400,6 +400,31 @@ can report through the rotational axes (absolute and/or relative rx, ry, rz). All other axes retain their meaning. A device must not mix regular directional axes and accelerometer axes on the same event node. +INPUT_PROP_PRESSUREPAD +---------------------- + +The INPUT_PROP_PRESSUREPAD property indicates that the device provides +simulated haptic feedback (e.g. a vibrator motor situated below the surface) +instead of physical haptic feedback (e.g. a hinge). This property is only set +if the device: + +- can differentiate between at least 5 fingers +- uses correct resolution for the X/Y (units and value) +- follows the MT protocol type B + +If the simulated haptic feedback is controllable by userspace the device must: + +- support simple haptic auto and manual triggering, and +- report correct force per touch, and correct units for them (newtons or grams), and +- provide the EV_FF FF_HAPTIC force feedback effect. + +Summing up, such devices follow the MS spec for input devices in +Win8 and Win8.1, and in addition may support the Simple haptic controller HID +table, and report correct units for the pressure. + +Where applicable, this property is set in addition to INPUT_PROP_BUTTONPAD, it +does not replace that property. + Guidelines ========== |