STRUCT FF_EFFECT(9) Input Subsystem STRUCT FF_EFFECT(9)NAMEstruct_ff_effect - defines force feedback effect
SYNOPSIS
struct ff_effect {
__u16 type;
__s16 id;
__u16 direction;
struct ff_trigger trigger;
struct ff_replay replay;
union u;
};
MEMBERS
type
type of the effect (FF_CONSTANT, FF_PERIODIC, FF_RAMP, FF_SPRING,
FF_FRICTION, FF_DAMPER, FF_RUMBLE, FF_INERTIA, or FF_CUSTOM)
id
an unique id assigned to an effect
direction
direction of the effect
trigger
trigger conditions (struct ff_trigger)
replay
scheduling of the effect (struct ff_replay)
u
effect-specific structure (one of ff_constant_effect,
ff_ramp_effect, ff_periodic_effect, ff_condition_effect,
ff_rumble_effect) further defining effect parameters
DESCRIPTION
This structure is sent through ioctl from the application to the
driver. To create a new effect application should set its id to -1; the
kernel will return assigned id which can later be used to update or
delete this effect.
DIRECTION OF THE EFFECT IS ENCODED AS FOLLOWS
0 deg -> 0x0000 (down) 90 deg -> 0x4000 (left) 180 deg -> 0x8000 (up)
270 deg -> 0xC000 (right)
COPYRIGHTKernel Hackers Manual 2.6. November 2013 STRUCT FF_EFFECT(9)