Input: ALPS - do not set REL_X/REL_Y capabilities on the touchpad

Relative events are only reported via secondary device therefore device
associated with the touchpad should not advertise these capabilities.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
index a3f492a5085..b03e7e0b409 100644
--- a/drivers/input/mouse/alps.c
+++ b/drivers/input/mouse/alps.c
@@ -487,6 +487,17 @@ int alps_init(struct psmouse *psmouse)
         if (alps_hw_init(psmouse))
                 goto init_fail;
 
+        /*
+         * Undo part of setup done for us by psmouse core since touchpad
+         * is not a relative device.
+         */
+        __clear_bit(EV_REL, dev1->evbit);
+        __clear_bit(REL_X, dev1->relbit);
+        __clear_bit(REL_Y, dev1->relbit);
+
+        /*
+         * Now set up our capabilities.
+         */
         dev1->evbit[BIT_WORD(EV_KEY)] |= BIT_MASK(EV_KEY);
         dev1->keybit[BIT_WORD(BTN_TOUCH)] |= BIT_MASK(BTN_TOUCH);
         dev1->keybit[BIT_WORD(BTN_TOOL_FINGER)] |= BIT_MASK(BTN_TOOL_FINGER);