1STRUCT FF_ENVELOPE(9)           Input Subsystem          STRUCT FF_ENVELOPE(9)
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NAME

6       struct_ff_envelope - generic force-feedback effect envelope
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SYNOPSIS

9       struct ff_envelope {
10         __u16 attack_length;
11         __u16 attack_level;
12         __u16 fade_length;
13         __u16 fade_level;
14       };
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MEMBERS

17       attack_length
18           duration of the attack (ms)
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20       attack_level
21           level at the beginning of the attack
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23       fade_length
24           duration of fade (ms)
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26       fade_level
27           level at the end of fade
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DESCRIPTION

30       The attack_level and fade_level are absolute values; when applying
31       envelope force-feedback core will convert to positive/negative value
32       based on polarity of the default level of the effect. Valid range for
33       the attack and fade levels is 0x0000 - 0x7fff
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36Kernel Hackers Manual 2.6.         June 2019             STRUCT FF_ENVELOPE(9)
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