@@ -185,10 +185,20 @@ instead of EV_REL codes.
A few EV_REL codes have special meanings:
-* REL_WHEEL, REL_HWHEEL:
+* REL_WHEEL:
- - These codes are used for vertical and horizontal scroll wheels,
- respectively.
+ - These codes are used for vertical scroll wheels.
+
+ - REL_WHEEL is for normal wheel operational mode, e. g. low-resolution
+ (line-based) scroll.
+
+ - REL_HIRES_WHEEL should be used when the wheel has two resolutions and it
+ is in high-resolution mode, e. g. the same angular movement that would
+ produce a single REL_WHEEL will produce multiple REL_HIRES_WHEEL events.
+
+* REL_HWHEEL:
+
+ - This code is used for horizontal scroll wheels.
EV_ABS
------
@@ -703,6 +703,7 @@
#define REL_DIAL 0x07
#define REL_WHEEL 0x08
#define REL_MISC 0x09
+#define REL_HIRES_WHEEL 0x0a
#define REL_MAX 0x0f
#define REL_CNT (REL_MAX+1)
As some devices can produce either low-res or high-res vertical wheel EV_REL events, add a new event to allow userspace to distinguish between them. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> --- Documentation/input/event-codes.rst | 16 +++++++++++++--- include/uapi/linux/input-event-codes.h | 1 + 2 files changed, 14 insertions(+), 3 deletions(-)