From 94ec26c855bc675259e4f1658673f458040affd7 Mon Sep 17 00:00:00 2001 From: Jari Vanhala Date: Thu, 24 Dec 2009 21:52:20 -0800 Subject: Input: ff-memless - add notion of direction to for rumble effects This adds simple direction calculation when combining effects. It's useful to decide motor direction for rumble (vibrator). Signed-off-by: Jari Vanhala Acked-by: Anssi Hannula Signed-off-by: Dmitry Torokhov --- drivers/input/ff-memless.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) (limited to 'drivers/input/ff-memless.c') diff --git a/drivers/input/ff-memless.c b/drivers/input/ff-memless.c index 9667a5fd6bd..f967008f332 100644 --- a/drivers/input/ff-memless.c +++ b/drivers/input/ff-memless.c @@ -220,6 +220,22 @@ static int get_compatible_type(struct ff_device *ff, int effect_type) return 0; } +/* + * Only left/right direction should be used (under/over 0x8000) for + * forward/reverse motor direction (to keep calculation fast & simple). + */ +static u16 ml_calculate_direction(u16 direction, u16 force, + u16 new_direction, u16 new_force) +{ + if (!force) + return new_direction; + if (!new_force) + return direction; + return (((u32)(direction >> 1) * force + + (new_direction >> 1) * new_force) / + (force + new_force)) << 1; +} + /* * Combine two effects and apply gain. */ @@ -254,6 +270,19 @@ static void ml_combine_effects(struct ff_effect *effect, case FF_RUMBLE: strong = (u32)new->u.rumble.strong_magnitude * gain / 0xffff; weak = (u32)new->u.rumble.weak_magnitude * gain / 0xffff; + + if (effect->u.rumble.strong_magnitude + strong) + effect->direction = ml_calculate_direction( + effect->direction, + effect->u.rumble.strong_magnitude, + new->direction, strong); + else if (effect->u.rumble.weak_magnitude + weak) + effect->direction = ml_calculate_direction( + effect->direction, + effect->u.rumble.weak_magnitude, + new->direction, weak); + else + effect->direction = 0; effect->u.rumble.strong_magnitude = min(strong + effect->u.rumble.strong_magnitude, 0xffffU); @@ -268,6 +297,13 @@ static void ml_combine_effects(struct ff_effect *effect, /* here we also scale it 0x7fff => 0xffff */ i = i * gain / 0x7fff; + if (effect->u.rumble.strong_magnitude + i) + effect->direction = ml_calculate_direction( + effect->direction, + effect->u.rumble.strong_magnitude, + new->direction, i); + else + effect->direction = 0; effect->u.rumble.strong_magnitude = min(i + effect->u.rumble.strong_magnitude, 0xffffU); effect->u.rumble.weak_magnitude = -- cgit v1.2.3