Re: USB mouse wheel breakage was Re: Linux 2.4.5-ac5

[Vojtech Pavlik]

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On Fri, Jun 01, 2001 at 10:57:17AM +0100, Michael wrote:

> On Wed, May 30, 2001 at 09:30:39PM +0100, Alan Cox wrote:
> > 2.4.5-ac4
> > o	Update USB hid drivers				(Vojtech Pavlik)
> 
> I think these changes have broken my USB wheel mouse.
> 
> Events seems to be getting lost (/dev/input/mice)
> 
> It only scrolls when either the scroll direction has changed or if other
> mouse events occur (e.g. you need to wiggle mouse from side to side to
> scroll down a long page in mozilla)
> 
> problems seems to be in drivers/usb/hid-core.c hid_input_field line 772
> 
> 	for (n = 0; n < count; n++) {
> 
> 		if (HID_MAIN_ITEM_VARIABLE & field->flags) {
> 
> 			if ((field->flags & HID_MAIN_ITEM_RELATIVE) && !value[n])
> 				continue;
> The next 2 lines are dropping the scroll wheel events (which appear in the
> input code as type:2, code: 8, value -1 or 1 depending on direction)
> 
> 			if (value[n] == field->value[n])
> 				continue;
> 			hid_process_event(hid, field, &field->usage[n], value[n]);
> 			continue;
> 		}

Thanks for the detailed report.
Here is the fix.

Alan, please apply this to -ac5.

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Vojtech Pavlik
SuSE Labs

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diff -urN linux-2.4.5-ac4/drivers/usb/hid-core.c linux/drivers/usb/hid-core.c
--- linux-2.4.5-ac4/drivers/usb/hid-core.c	Tue May 29 19:48:15 2001
+++ linux/drivers/usb/hid-core.c	Fri Jun  1 16:30:33 2001
@@ -775,7 +775,7 @@
 
 			if ((field->flags & HID_MAIN_ITEM_RELATIVE) && !value[n])
 				continue;
-			if (value[n] == field->value[n])
+			if ((~field->flags & HID_MAIN_ITEM_RELATIVE) && value[n] == field->value[n])
 				continue;
 			hid_process_event(hid, field, &field->usage[n], value[n]);
 			continue;

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