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-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
------