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| author |   Peter Hutterer <peter.hutterer@who-t.net> | 2018-12-05 10:42:21 +1000 |
|---|---|---|
| committer |   Benjamin Tissoires <benjamin.tissoires@redhat.com> | 2018-12-07 16:27:11 +0100 |
| commit | 52ea899637c746984d657b508da6e3f2686adfca (patch) | |
| tree | 5e710d864a62c37567fce0ad91a5bce45486b2f5 /include/uapi/linux/input-event-codes.h | |
| parent | Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid (diff) | |
| download | linux-dev-52ea899637c746984d657b508da6e3f2686adfca.tar.xz linux-dev-52ea899637c746984d657b508da6e3f2686adfca.zip | |
Input: add `REL_WHEEL_HI_RES` and `REL_HWHEEL_HI_RES`
This event code represents scroll reports from high-resolution wheels and
is modelled after the approach Windows uses. The value 120 is one detent
(wheel click) of movement. Mice with higher-resolution scrolling can send
fractions of 120 which must be accumulated in userspace. Userspace can either
wait for a full 120 to accumulate or scroll by fractions of one logical scroll
movement as the events come in. 120 was picked as magic number because it has
a high number of integer fractions that can be used by high-resolution wheels.
For more information see
https://docs.microsoft.com/en-us/previous-versions/windows/hardware/design/dn613912(v=vs.85)
These new axes obsolete REL_WHEEL and REL_HWHEEL. The legacy axes are emulated
by the kernel but the most accurate (and most granular) data is available
through the new axes.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Verified-by: Harry Cutts <hcutts@chromium.org>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Diffstat (limited to 'include/uapi/linux/input-event-codes.h')
| -rw-r--r-- | include/uapi/linux/input-event-codes.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/uapi/linux/input-event-codes.h b/include/uapi/linux/input-event-codes.h index 3eb5a4c3d60a..265ef2028660 100644 --- a/include/uapi/linux/input-event-codes.h +++ b/include/uapi/linux/input-event-codes.h @@ -716,6 +716,8 @@ * the situation described above. */ #define REL_RESERVED 0x0a +#define REL_WHEEL_HI_RES 0x0b +#define REL_HWHEEL_HI_RES 0x0c #define REL_MAX 0x0f #define REL_CNT (REL_MAX+1) |