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    Subject[PATCH 4.1 026/159] Input: synaptics - fix handling of disabling gesture mode
    Date
    4.1-stable review patch.  If anyone has any objections, please let me know.

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

    From: Dmitry Torokhov <dmitry.torokhov@gmail.com>

    commit e51e38494a8ecc18650efb0c840600637891de2c upstream.

    Bit 2 of the mode byte has dual meaning: it can disable reporting of
    gestures when touchpad works in Relative mode or normal Absolute mode,
    or it can enable so called Extended W-Mode when touchpad uses enhanced
    Absolute mode (W-mode). The extended W-Mode confuses our driver and
    causes missing button presses on some Thinkpads (x250, T450s), so let's
    make sure we do not enable it.

    Also, according to the spec W mode "... bit is defined only in Absolute
    mode on pads whose capExtended capability bit is set. In Relative mode and
    in TouchPads without this capability, the bit is reserved and should be
    left at 0.", so let's make sure we respect this requirement as well.

    Reported-by: Nick Bowler <nbowler@draconx.ca>
    Suggested-by: Gabor Balla <gaborwho@gmail.com>
    Tested-by: Gabor Balla <gaborwho@gmail.com>
    Tested-by: Nick Bowler <nbowler@draconx.ca>
    Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/input/mouse/synaptics.c | 12 ++++++++----
    1 file changed, 8 insertions(+), 4 deletions(-)

    --- a/drivers/input/mouse/synaptics.c
    +++ b/drivers/input/mouse/synaptics.c
    @@ -519,14 +519,18 @@ static int synaptics_set_mode(struct psm
    struct synaptics_data *priv = psmouse->private;

    priv->mode = 0;
    - if (priv->absolute_mode)
    +
    + if (priv->absolute_mode) {
    priv->mode |= SYN_BIT_ABSOLUTE_MODE;
    - if (priv->disable_gesture)
    + if (SYN_CAP_EXTENDED(priv->capabilities))
    + priv->mode |= SYN_BIT_W_MODE;
    + }
    +
    + if (!SYN_MODE_WMODE(priv->mode) && priv->disable_gesture)
    priv->mode |= SYN_BIT_DISABLE_GESTURE;
    +
    if (psmouse->rate >= 80)
    priv->mode |= SYN_BIT_HIGH_RATE;
    - if (SYN_CAP_EXTENDED(priv->capabilities))
    - priv->mode |= SYN_BIT_W_MODE;

    if (synaptics_mode_cmd(psmouse, priv->mode))
    return -1;



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