Re: 2.6.11 ALPS Issue

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On Wed, 02 Mar 2005 11:52:42 -0700, Dax Kelson <dax@xxxxxxxxxxxx> wrote:

> -------- Forwarded Message --------
> From: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
> Reply-To: dtor_core@xxxxxxxxxxxxx
> To: MIGUELANXO@xxxxxxxxxxxxxx <MIGUELANXO@xxxxxxxxxxxxxx>
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Subject: Re: 2.6.11: touchpad unresponsive
> Date: Wed, 2 Mar 2005 12:12:53 -0500 

> > 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/

Load of bull! See the attached patch for real fix for "no motion for
small increments" problem. It's a kernel bug, plain and simple (provided
that your ALPS was identified in the first place, just like Dmitry said).

Actually, using Peter's driver is a good idea and I'll be happy to see
it packaged and shipping. But it's retarded to use it in order to cover
for obvious bugs.

-- 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)


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