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Under certain circumstances, we want to disable some input devices from userspace. In particular, when we detect that the lid of a laptop is closed, we want to be able to disable touchpad and touchscreen to avoid bogus input. To facilitate this, we introduce the "inhibited" sysfs property for input devices. Using this property, userspace can tell a driver that the events it can provide are not currently of interest and should be ignored. We provide hooks so that the driver can take additional actions, such as powering down the device. We deliberately keep this limited to input devices for now to keep the implementation as straightforward as possible. (cherry-pick from: https://chromium-review.googlesource.com/207989) verify that touchpad works echo 1 > /sys/bus/i2c/drivers/elan_i2c/4-0015/input/input0/inhibited touchpad stops working echo 0 > /sys/bus/i2c/drivers/elan_i2c/4-0015/input/input0/inhibited touchpad works again Signed-off-by: Patrik Fimml <patrikf@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/207989 Reviewed-by: Dmitry Torokhov <dtor@chromium.org> Reviewed-by: Benson Leung <bleung@chromium.org> Change-Id: I889d37ef7ffc49f3c073b1c283d5c3327c263b7f Signed-off-by: Caesar Wang <wxt@rock-chips.com>