diff options
| author | Harry Cutts <hcutts@chromium.org> | 2018-08-30 14:56:18 -0700 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2018-09-05 10:12:07 +0200 |
| commit | aaf9978c3c0291ef3beaa97610bc9c3084656a85 (patch) | |
| tree | d8ba6e5ad943afc24dc582f17b8ddadee9242703 /Documentation/input | |
| parent | 7a324b3f0535ceb0f6676fa20ca2a7b6213008cb (diff) | |
Input: Add the `REL_WHEEL_HI_RES` event code
This event code represents scroll reports from high-resolution wheels,
and will be used by future patches in this series. See the linux-input
"Reporting high-resolution scroll events" thread [0] for more details.
[0]: https://www.spinics.net/lists/linux-input/msg57380.html
Signed-off-by: Harry Cutts <hcutts@chromium.org>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'Documentation/input')
| -rw-r--r-- | Documentation/input/event-codes.rst | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/Documentation/input/event-codes.rst b/Documentation/input/event-codes.rst index a8c0873beb95..cef220c176a4 100644 --- a/Documentation/input/event-codes.rst +++ b/Documentation/input/event-codes.rst @@ -190,7 +190,16 @@ A few EV_REL codes have special meanings: * REL_WHEEL, REL_HWHEEL: - These codes are used for vertical and horizontal scroll wheels, - respectively. + respectively. The value is the number of "notches" moved on the wheel, the + physical size of which varies by device. For high-resolution wheels (which + report multiple events for each notch of movement, or do not have notches) + this may be an approximation based on the high-resolution scroll events. + +* REL_WHEEL_HI_RES: + + - If a vertical scroll wheel supports high-resolution scrolling, this code + will be emitted in addition to REL_WHEEL. The value is the (approximate) + distance travelled by the user's finger, in microns. EV_ABS ------ |