Re: [PATCH v2 1/1] elantech: Add support for trackpoint found on some v3 models

[Greg KH <greg@kroah.com>]

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 <hdegoede@redhat.com>
> Cc: stable@vger.kernel.org
> Signed-off-by: Ulrik De Bie <ulrik.debie-os@e2big.org>
> ---
>  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