Commit e0709814 authored Dec 12, 2016 by KT Liao Committed by Greg Kroah-Hartman Apr 13, 2018

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>

parent 97e885c7

drivers/input/mouse/elantech.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -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");