Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.9 034/310] Input: elantech - force relative mode on a certain module | Date | Wed, 11 Apr 2018 20:32:53 +0200 |
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4.9-stable review patch. If anyone has any objections, please let me know.
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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 @@ -1711,6 +1711,17 @@ 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");
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