From: <gregkh@linuxfoundation.org>
To: kt.liao@emc.com.tw, alexander.levin@microsoft.com,
dmitry.torokhov@gmail.com, gregkh@linuxfoundation.org
Cc: <stable@vger.kernel.org>, <stable-commits@vger.kernel.org>
Subject: Patch "Input: elantech - force relative mode on a certain module" has been added to the 4.4-stable tree
Date: Tue, 10 Apr 2018 11:04:11 +0200 [thread overview]
Message-ID: <1523351051184195@kroah.com> (raw)
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;a=summary
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
reply other threads:[~2018-04-10 9:05 UTC|newest]
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