Peter wrote:
> Hi,
Hi!
> my description wasn't that good indeed :)
>
> I have an Logitech Formula Force GP and tried to get Force Feedback
> working (to play LFS (www.lfs.net) via wine). The wheel is recognized
> properly and as an input device there are no problems. Force Feedback
> isn't working properly, tho. I looked around a bit and found hid-lgff.c,
> which i have modified a bit to get an idea how the effects are
> generated:
>
> case FF_CONSTANT:
> x = effect->u.ramp.start_level + 0x7f; /* 0x7f is center */
> y = effect->u.ramp.end_level + 0x7f; /**/
> CLAMP(x);
> CLAMP(y);
> report->field[0]->value[0] = 0x51;
> report->field[0]->value[1] = 0x08;
> report->field[0]->value[2] = x;
> report->field[0]->value[3] = y;
> dbg_hid("(x, y)=(%04x, %04x)\n", x, y);
> usbhid_submit_report(hid, report, USB_DIR_OUT);
> > printk(KERN_INFO "Forces: x=%d y=%d\n",
> > report->field[0]->value[2],
> > report->field[0]->value[3]);
> break;
>
> I guess i could have enabled debug somehow, but didn't know how to. It
> did the trick for me anyway.
>
> The problem is, that somehow x and y only get values above 0x7f.
This issue is probably fixed by this commit:
http://git.kernel.org/?p=linux/kernel/git/dtor/input.git;a=commitdiff;h=1b11c88d3e8f55dc9d193d19de11e3f7abc1b7d7
--
Anssi Hannula
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