linux-kernel - Re: [PATCH v3 13/13] HID: hid-multitouch: forwards ABS_SCAN

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Date:	Tue, 13 Nov 2012 19:43:57 +0100
From:	"Henrik Rydberg" <rydberg@...omail.se>
To:	Benjamin Tissoires <benjamin.tissoires@...il.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Stephane Chatty <chatty@...c.fr>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 13/13] HID: hid-multitouch: forwards ABS_SCAN_TIME

> To conclude, we obviously have devices with a rather short wrap-around
> time. However, since the normal inter-frame time is in the millisecond
> range, it should not be overly restrictive to change the definition of
> the minimum wraparound time from hours to seconds.

Sorry, Benjamin, you are right about the counter. To be useful, we do
need to know the number of bits of the counter, so that differences
can be computed properly. In other words, either ABS_SCAN_TIME is
be the better choice, or we need to make sure that the counter wraps
on the full 32 bit boundary.

Henrik
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