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    Subject[PATCH 4.9 034/310] Input: elantech - force relative mode on a certain module
    Date
    4.9-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    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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