From e0709814a17f0eeed84fa593f7a3057aa38cba56 Mon Sep 17 00:00:00 2001 From: KT Liao Date: Mon, 12 Dec 2016 11:03:42 -0800 Subject: [PATCH] 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 Signed-off-by: Dmitry Torokhov Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/input/mouse/elantech.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c index 59603a5..c519c0b 100644 --- a/drivers/input/mouse/elantech.c +++ b/drivers/input/mouse/elantech.c @@ -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"); -- 2.7.4