diff options
| author | KT Liao <kt.liao@emc.com.tw> | 2016-12-12 11:03:42 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-04-13 19:50:04 +0200 |
| commit | c15a3d7665d315f91c19d963c8d6bcf8ab595d88 (patch) | |
| tree | bab5d46501d9de30fbdc0681917893a12da58ad1 /drivers/input | |
| parent | 29ecdc27ab23dee219035645c2fe6f4ec9b136b7 (diff) | |
Input: elantech - force relative mode on a certain module
[ 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>
Diffstat (limited to 'drivers/input')
| -rw-r--r-- | drivers/input/mouse/elantech.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c index 51b96e9bf793..06ea28e5d7b4 100644 --- a/drivers/input/mouse/elantech.c +++ b/drivers/input/mouse/elantech.c @@ -1715,6 +1715,17 @@ 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"); |