• Benjamin Tissoires's avatar
    Input: synaptics - add manual min/max quirk · 421e08c4
    Benjamin Tissoires authored
    The new Lenovo Haswell series (-40's) contains a new Synaptics touchpad.
    However, these new Synaptics devices report bad axis ranges.
    Under Windows, it is not a problem because the Windows driver uses RMI4
    over SMBus to talk to the device. Under Linux, we are using the PS/2
    fallback interface and it occurs the reported ranges are wrong.
    
    Of course, it would be too easy to have only one range for the whole
    series, each touchpad seems to be calibrated in a different way.
    
    We can not use SMBus to get the actual range because I suspect the firmware
    will switch into the SMBus mode and stop talking through PS/2 (this is the
    case for hybrid HID over I2C / PS/2 Synaptics touchpads).
    
    So as a temporary solution (until RMI4 land into upstream), start a new
    list of quirks with the min/max manually set.
    Signed-off-by: default avatarBenjamin Tissoires <benjamin.tissoires@redhat.com>
    CC: stable@vger.kernel.org
    Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
    421e08c4
synaptics.c 45.8 KB