The branch main has been updated by wulf:
URL:
https://cgit.FreeBSD.org/src/commit/?id=3b2175fdb62c7f872e78ce732952f2ac2ff99c8d
commit 3b2175fdb62c7f872e78ce732952f2ac2ff99c8d
Author: Vladimir Kondratyev <w...@freebsd.org>
AuthorDate: 2020-11-30 21:10:04 +0000
Commit: Vladimir Kondratyev <w...@freebsd.org>
CommitDate: 2021-01-07 23:18:44 +0000
evdev: Implement fuzz.
Fuzz is used to filter noise from the event stream.
Upcoming gamepad drivers use it.
Reviewed by: hselasky (as part of D27993)
---
sys/dev/evdev/evdev.c | 20 +++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)
diff --git a/sys/dev/evdev/evdev.c b/sys/dev/evdev/evdev.c
index e76abbc816d3..086ee36333dc 100644
--- a/sys/dev/evdev/evdev.c
+++ b/sys/dev/evdev/evdev.c
@@ -684,6 +684,7 @@ static void
evdev_modify_event(struct evdev_dev *evdev, uint16_t type, uint16_t code,
int32_t *value)
{
+ int32_t fuzz, old_value, abs_change;
EVDEV_LOCK_ASSERT(evdev);
@@ -710,7 +711,24 @@ evdev_modify_event(struct evdev_dev *evdev, uint16_t type,
uint16_t code,
break;
case EV_ABS:
- /* TBD: implement fuzz */
+ fuzz = evdev->ev_absinfo[code].fuzz;
+ if (fuzz == 0 || code == ABS_MT_SLOT)
+ break;
+ else if (!ABS_IS_MT(code))
+ old_value = evdev->ev_absinfo[code].value;
+ else if (bit_test(evdev->ev_abs_flags, ABS_MT_SLOT))
+ old_value = evdev_get_mt_value(evdev,
+ evdev_get_last_mt_slot(evdev), code);
+ else /* Pass MT protocol type A events as is */
+ break;
+
+ abs_change = abs(*value - old_value);
+ if (abs_change < fuzz / 2)
+ *value = old_value;
+ else if (abs_change < fuzz)
+ *value = (old_value * 3 + *value) / 4;
+ else if (abs_change < fuzz * 2)
+ *value = (old_value + *value) / 2;
break;
}
}
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