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Input: elantech - force relative mode on a certain module

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[ 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>
This commit is contained in:
KT Liao 2016-12-12 11:03:42 -08:00 committed by Greg Kroah-Hartman
parent 97e885c7d1
commit e0709814a1
1 changed files with 11 additions and 0 deletions
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11
drivers/input/mouse/elantech.c
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@ -1711,6 +1711,17 @@ int elantech_init(struct psmouse *psmouse)
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");