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  4. struct_ff_envelope(9)

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STRUCT FF_ENVELOPE(9) Input Subsystem STRUCT FF_ENVELOPE(9)

NAME

struct_ff_envelope - generic force-feedback effect envelope

SYNOPSIS

struct ff_envelope {


  __u16 attack_length;


  __u16 attack_level;


  __u16 fade_length;


  __u16 fade_level;
};

MEMBERS

attack_length

duration of the attack (ms)

attack_level

level at the beginning of the attack

fade_length

duration of fade (ms)

fade_level

level at the end of fade

DESCRIPTION

The attack_level and fade_level are absolute values; when applying envelope force-feedback core will convert to positive/negative value based on polarity of the default level of the effect. Valid range for the attack and fade levels is 0x0000 - 0x7fff

COPYRIGHT

April 2023 Kernel Hackers Manual 2.6.