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DateThu, 10 Feb 2005 11:07:46 -0800
FromPete Zaitcev <>
SubjectRe: [PATCH] Fix ALPS sync loss
On Tue, 8 Feb 2005 18:40:12 -0500, Dmitry Torokhov <dtor_core@ameritech.net> wrote:

> Here is the promised patch. It turns out protocol validation code was
> a bit (or rather a byte ;) ) off.

> +++ b/drivers/input/mouse/alps.c 2005-02-08 18:16:27 -05:00
> @@ -198,8 +198,8 @@
> return PSMOUSE_BAD_DATA;
>
> /* Bytes 2 - 6 should have 0 in the highest bit */
> - if (psmouse->pktcnt > 1 && psmouse->pktcnt <= 6 &&
> - (psmouse->packet[psmouse->pktcnt] & 0x80))
> + if (psmouse->pktcnt >= 2 && psmouse->pktcnt <= 6 &&
> + (psmouse->packet[psmouse->pktcnt - 1] & 0x80))
> return PSMOUSE_BAD_DATA;

This seems to work here, no more dead pad.

-- Pete
-
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