Re: 2.6.11: touchpad unresponsive

Pete Zaitcev
2005-03-03T00:58:30Z

On Wed, 2 Mar 2005 12:12:53 -0500, Dmitry Torokhov <dmitry.torokhov@gmail.com> wrote:

> > Booting X in new kernel makes my touchpad very unresponsive. I can't
> > click any longer in the touchpad area, and the touchpad doesn't response
> > when moving in small increments, so the whole experience is quite bad.

> If it is identified as an ALPS touchpad you can try installing Peter
> Osterlund's Synaptics X driver:
>
> http://web.telia.com/~u89404340/touchpad/

Not a bad idea but I suspect it may be simpler to use the attached patch
instead (written by Peter, actually).

-- Pete

diff -urp -X dontdiff linux-2.6.11-rc4/drivers/input/mousedev.c linux-2.6.11-rc4-lem/drivers/input/mousedev.c
--- linux-2.6.11-rc4/drivers/input/mousedev.c 2005-02-15 22:38:39.000000000 -0800
+++ linux-2.6.11-rc4-lem/drivers/input/mousedev.c 2005-02-15 22:54:35.000000000 -0800
@@ -71,6 +71,7 @@ struct mousedev {
struct mousedev_hw_data packet;
unsigned int pkt_count;
int old_x[4], old_y[4];
+ int frac_dx, frac_dy;
unsigned long touch;
};

@@ -117,24 +118,31 @@ static struct mousedev mousedev_mix;

static void mousedev_touchpad_event(struct input_dev *dev, struct mousedev *mousedev, unsigned int code, int value)
{
- int size;
+ int size, tmp;
+ enum { FRACTION_DENOM = 100 };

if (mousedev->touch) {
+ size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
+ if (size == 0) size = xres;
switch (code) {
case ABS_X:
- size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
- if (size == 0) size = xres;
fx(0) = value;
- if (mousedev->pkt_count >= 2)
- mousedev->packet.dx = ((fx(0) - fx(1)) / 2 + (fx(1) - fx(2)) / 2) * xres / (size * 2);
+ if (mousedev->pkt_count >= 2) {
+ tmp = ((value - fx(2)) * (250 * FRACTION_DENOM)) / size;
+ tmp += mousedev->frac_dx;
+ mousedev->packet.dx = tmp / FRACTION_DENOM;
+ mousedev->frac_dx = tmp - mousedev->packet.dx * FRACTION_DENOM;
+ }
break;

case ABS_Y:
- size = dev->absmax[ABS_Y] - dev->absmin[ABS_Y];
- if (size == 0) size = yres;
fy(0) = value;
- if (mousedev->pkt_count >= 2)
- mousedev->packet.dy = -((fy(0) - fy(1)) / 2 + (fy(1) - fy(2)) / 2) * yres / (size * 2);
+ if (mousedev->pkt_count >= 2) {
+ tmp = ((fy(2) - value) * (250 * FRACTION_DENOM)) / size;
+ tmp += mousedev->frac_dy;
+ mousedev->packet.dy = tmp / FRACTION_DENOM;
+ mousedev->frac_dy = tmp - mousedev->packet.dy * FRACTION_DENOM;
+ }
break;
}
}
@@ -268,6 +276,8 @@ static void mousedev_touchpad_touch(stru
clear_bit(0, &mousedev_mix.packet.buttons);
}
mousedev->touch = mousedev->pkt_count = 0;
+ mousedev->frac_dx = 0;
+ mousedev->frac_dy = 0;
}
else
if (!mousedev->touch)