From: Dmitry Torokhov <dtor_core@ameritech.net>
To: linux-kernel@vger.kernel.org
Subject: Re: force feedback envelope incomplete
Date: Sun, 16 Oct 2005 13:35:47 -0500
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Cc: emard@softhome.net, Vojtech Pavlik <vojtech@suse.cz>
References: <20051015213953.GA27117@tink>
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On Saturday 15 October 2005 16:39, emard@softhome.net wrote:
> HI
> 
> Force feedback envelope struct in input.h 
> for periodic events is incomplete.
> 
> struct ff_envelope {
>         __u16 attack_length;    /* Duration of attack (ms) */
>         __u16 attack_level;     /* Level at beginning of attack */
>         __u16 fade_length;      /* Duration of fade (ms) */
>         __u16 fade_level;       /* Level at end of fade */
> };
> 
> The envelope consists of:
> 1. Attack level (Level at beginning of attack)
> 2. Attack time
> 3. Sustain level (Level at end of attack and beginning of fade)
> 4. Sustain time
> 5. Fade level (Level at the end of fade)
> 6. Fade time
> 
> If I want to implement proper envelope I propose something like this:
> 
> struct ff_envelope {
>         __u16 attack_length;    /* Duration of attack (ms) */
>         __u16 attack_level;     /* Level at beginning of attack */
>         __u16 sustain_length;   /* Duration of sustain (ms) */
>         __u16 sustain_level;    /* Sustain Level at end of attack and beginning of fade */
>         __u16 fade_length;      /* Duration of fade (ms) */
>         __u16 fade_level;       /* Level at end of fade */
> };

You might want to talk to Vojtech about this (CC-ed).

-- 
Dmitry
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