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Input: ff-core - correct magnitude setting for rumble compatibility

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When converting a rumble into a periodic effect, for compatibility,
the magnitude is effectively calculated using:

magnitude = max(strong_rubble / 3 + weak_rubble / 6, 0x7fff);

The rumble magnitudes are both u16 and the resulting magnitude is
s16. The max is presumably an attempt to limit the result of the
calculation to the maximum possible magnitude for the s16 result,
and thus should be a min.

However in the case of strong = weak = 0xffff, the result of the first
part of the calculation is 0x7fff, meaning that the min would be
redundant anyway, so simply remove the current max.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20211130135039.13726-1-ckeepax@opensource.cirrus.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Charles Keepax 2021-12-06 23:23:00 -08:00 committed by Dmitry Torokhov
parent b85a4d9628
commit 8c374ef454
1 changed files with 1 additions and 1 deletions
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2
drivers/input/ff-core.c
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@ -67,7 +67,7 @@ static int compat_effect(struct ff_device *ff, struct ff_effect *effect)
effect->type = FF_PERIODIC;
effect->u.periodic.waveform = FF_SINE;
effect->u.periodic.period = 50;
effect->u.periodic.magnitude = max(magnitude, 0x7fff);
effect->u.periodic.magnitude = magnitude;
effect->u.periodic.offset = 0;
effect->u.periodic.phase = 0;
effect->u.periodic.envelope.attack_length = 0;