HID: multitouch: Only look at non touch fields in first packet of a frame

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Devices in "single finger hybrid mode" will send one report per finger,
on some devices only the first report of such a multi-packet frame will
contain a value for BTN_LEFT, in subsequent reports (if multiple fingers
are down) the value is always 0, causing hid-mt to report BTN_LEFT going
1 - 0 - 1 - 0 when pressing a clickpad and putting down a second finger.
This happens for example on USB 0603:0002 mt touchpads.

This commit fixes this by only reporting non touch fields for the first
packet of a (possibly) multi-packet frame.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

...

This commit is contained in:

Hans de Goede 2017-11-22 12:57:09 +01:00 • committed by Jiri Kosina

parent af8dc4d094

commit 55746d28d6

1 changed files with 15 additions and 2 deletions

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drivers/hid/hid-multitouch.c

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