This is a note to let you know that I've just added the patch titled
Input: elantech - force relative mode on a certain module
to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: input-elantech-force-relative-mode-on-a-certain-module.patch and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From foo@baz Tue Apr 10 10:31:53 CEST 2018
From: KT Liao kt.liao@emc.com.tw Date: Mon, 12 Dec 2016 11:03:42 -0800 Subject: Input: elantech - force relative mode on a certain module
From: KT Liao kt.liao@emc.com.tw
[ Upstream commit d899520b0431e70279bfb5066ecb6dc91d0b7072 ]
One of Elan modules with sample version is 0x74 and hw_version is 0x03 has a bug in absolute mode implementation, so let it run in default PS/2 relative mode.
Signed-off-by: KT Liao kt.liao@emc.com.tw Signed-off-by: Dmitry Torokhov dmitry.torokhov@gmail.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/input/mouse/elantech.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
--- a/drivers/input/mouse/elantech.c +++ b/drivers/input/mouse/elantech.c @@ -1715,6 +1715,17 @@ int elantech_init(struct psmouse *psmous etd->samples[0], etd->samples[1], etd->samples[2]); }
+ if (etd->samples[1] == 0x74 && etd->hw_version == 0x03) { + /* + * This module has a bug which makes absolute mode + * unusable, so let's abort so we'll be using standard + * PS/2 protocol. + */ + psmouse_info(psmouse, + "absolute mode broken, forcing standard PS/2 protocol\n"); + goto init_fail; + } + if (elantech_set_absolute_mode(psmouse)) { psmouse_err(psmouse, "failed to put touchpad into absolute mode.\n");
Patches currently in stable-queue which might be from kt.liao@emc.com.tw are
queue-4.4/input-elantech-force-relative-mode-on-a-certain-module.patch queue-4.4/input-elan_i2c-clear-int-before-resetting-controller.patch