On Thu, Jun 12, 2014 at 08:15:01PM +0200, Ulrik De Bie wrote:

Some elantech v3 touchpad equipped laptops also have a trackpoint, before
this commit, these give sync errors. With this patch, the trackpoint is
provided as another input device: 'Elantech PS/2 TrackPoint'

The patch will also output messages that do not follow the expected pattern.
In the mean time I've seen 2 unknown packets occasionally:
0x04 , 0x00 , 0x00 , 0x00 , 0x00 , 0x00
0x00 , 0x00 , 0x00 , 0x02 , 0x00 , 0x00
I don't know what those are for, but they can be safely ignored.

Currently all packets that are not known to v3 touchpad and where
packet[3] (the fourth byte) lowest nibble is 6 are now recognized as
PACKET_TRACKPOINT and processed by the new elantech_report_trackpoint.

This has been verified to work on a laptop Lenovo L530 where the
touchpad/trackpoint combined identify themselves as:
psmouse serio1: elantech: assuming hardware version 3 (with firmware version 0x350f02)
psmouse serio1: elantech: Synaptics capabilities query result 0xb9, 0x15, 0x0c.

Reviewed-by: Hans de Goede <redacted>
Cc: stable@vger.kernel.org
Signed-off-by: Ulrik De Bie <redacted>
---
 drivers/input/mouse/elantech.c | 104 +++++++++++++++++++++++++++++++++++++++--
 drivers/input/mouse/elantech.h |   4 ++
 2 files changed, 105 insertions(+), 3 deletions(-)

This seems like a new feature to me and not a stable kernel patch.  How
does this fit in with the Documentation/stable_kernel_rules.txt
requirements?

thanks,

greg k-h