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authorHarry Cutts <hcutts@chromium.org>2018-08-30 14:56:18 -0700
committerJiri Kosina <jkosina@suse.cz>2018-09-05 10:12:07 +0200
commitaaf9978c3c0291ef3beaa97610bc9c3084656a85 (patch)
treed8ba6e5ad943afc24dc582f17b8ddadee9242703 /Documentation/input
parent7a324b3f0535ceb0f6676fa20ca2a7b6213008cb (diff)
downloadlinux-aaf9978c3c0291ef3beaa97610bc9c3084656a85.tar.bz2
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.rst11
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
------